Dynaflex Elastomeric Flexible Couplings Lcd Users Manual PC7000_2008_10_21

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Page 87 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex® Elastomeric Flexible

Couplings

Featuring: Dynafl ex® Shear-Type Couplings

Dynafl ex® Spool-Type Couplings

Dynafl ex® Bushing-Type Couplings

Dynafl ex® LCR Series Couplings

Dynafl ex® LCD Series Couplings

Effi cient power transmission and driveline component

durability are among powertrain designers’ most impor-

tant concerns. Increased durability and up-time are two

characteristics demanded by purchasers of today’s

complex and expensive machinery. These demands can

only be met with reliable, trouble-free, smooth-running

powertrains free from damaging loads which compro-

mise component life.

Powertrain component life is determined by the load

spectrum each component will experience during the

machine’s service life. Reciprocating engines, such as

spark-ignited gasoline and compression-ignited diesels,

produce alternating torque loads which, when super-

imposed on the steady driving torque, create alter-

nating stresses in driveline system components which

shorten component life and reliability. High transient

start-up torques and misalignment caused by skewed

rotational axes between driver and driven in electric

motor, hydraulic and pneumatic drives also cause high

imposed forces on driven components. These unwanted

forces loosen bolted joints and cause spline fretting,

clutch disk wear, bearing failure, gear tooth fatigue and

shaft fatigue, among an array of other problems.

Elastomeric fl exible couplings solve these problems.

They prolong driveline component life because they

reduce the magnitude of imposed loads, attenuate vibra-

tion in multiple planes, accommodate misalignments

in multiple planes, and act as barriers impeding noise

created by meshing gears, engaging clutches, etc.

Elastomeric fl exible couplings are also maintenance-

free. They require no lubrication or other maintenance

throughout their service life. Among the large variety of

coupling types available, LORD Corporation’s elasto-

meric couplings offer the most comprehensive package

of benefi ts available to the powertrain designer. LORD

Corporation’s product lines include fi ve different elas-

tomeric coupling styles which cover a wide range of

application requirements.

Application

Application requirements suggest the coupling style

needed to optimize powertrain performance and

component longevity. Misalignment accommodation,

torsional vibration isolation, transient shock dissipation

and required service life are important parameters

to consider when selecting a coupling to fi ll specifi c

application requirements.

A part’s listing in this catalog does not guarantee its availability.

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LORD engineers can assist you with selecting an appro-

priate coupling type and confi guration. With extensive

analytical capability and years of experience in designing

products for powertrain vibration, shock and motion

control, LORD engineers offer everything from simple

application assistance to complex system analysis and

specialized product design.

Torsional vibration, transient shock and misalignment

load analyses require specialized computer programs

and engineering experience. LORD engineers can

analyze your system and recommend the right solution,

whether it’s a selection from the standard product line or

a custom design.

LORD Corporation’s standard product lines of elasto-

meric fl exible powertrain couplings are presented in the

following sections. Many variations of standard products

are available, but not listed as ‘standard.’ Main drive, fan

drive, PTO and accessory drive couplings are available

in a host of custom designs and variations of standard

products. LORD engineers are ready to help you meet

your specifi c application requirements with custom

designs where necessary.

Product Lines

LORD offers fi ve major lines of elastomeric fl exible

couplings. Standard lines are presented on the following

pages. In addition to the standards listed, many

variations are available in each product line.

Dynafl ex® Shear-Type Couplings

LORD Dynafl ex Shear-Type Coupling features a durable

elastomeric fl exing element bonded between two hubs.

These couplings are designed for fractional horsepower

applications requiring smooth starting transition, torsional

vibration isolation and misalignment accommodation.

Typical applications are small electric motor drives,

low-torque mechanisms, power take-offs and auxiliary

equipment drives.

Dynafl ex® Spool-Type Couplings

LORD Dynafl ex Spool-Type Couplings can be arranged

in a variety of confi gurations to create a wide range

of torque-transmitting capability. Elastomeric spool

elements can be purchased in lot sizes for customer-

assembled coupling designs, or LORD can provide a

complete coupling assembly to meet specifi c application

requirements. Typical applications are large drives

requiring high torque capacity and low torsional stiffness.

Dynafl ex® Bushing-Type Couplings

LORD Dynafl ex Bushing-Type Couplings are bonded

elastomeric elements designed for use in multiple

element coupling confi gurations where high torque

capacity is required. Bushings are available in a

variety of stiffnesses. They can be purchased in lots for

customer-assembled designs, or LORD can provide

complete coupling assemblies designed to meet your

specifi c application requirements. Applications requiring

high torque/high torsional stiffness, but angular, axial and

parallel misalignment accommodation can be designed

using these bushings in a variety of confi gurations

including parallel and series arrangements.

Dynafl ex® LCR Series Couplings

LORD Dynafl ex LCR Series Couplings features an

elastomeric ring with bonded, bush-type inserts allowing

various attachment confi gurations. These couplings

offer a soft torsional spring rate which permits smooth

transmission of driving torque while attenuating

shock torques and providing excellent misalignment

accommodation. These couplings are used in PTO

drives where torsion and cocking fl exibility are required.

They can be mated with a variety of hub confi gurations.

Special high-torque designs are available, as well

as custom designs to meet special application

requirements.

Dynafl ex® LCD Series Couplings

LORD Dynafl ex LCD Series Couplings are the ultimate

coupling for reciprocating engine drives. This coupling

features a bonded elastomeric fl exing element which is

radially precompressed into a fl anged outer housing.

This design produces a low torsional stiffness for

maximum isolation of engine fi ring-pulse-induced

torsional disturbances, torque overload slip protection,

misalignment accommodation, superior shock pulse

attenuation and fatigue life, and is adaptable to a variety

of drive attachment designs. Custom designs are

available to fi t nearly every SAE fl ywheel confi guration

available from most engine manufacturers.

Page 88 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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Page 89 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Coupling Application Guide

Dynafl ex

Shear-Type

Dynafl ex

Spool-Type

Dynafl ex

Bushing-Type

Dynafl ex

LCR Series

Dynafl ex

LCD Series

Horsepower Rated: 1/50 to 1 Rated: 50 to 1000 Rated: 10 to 600 Rated: 4 to 135 Rated: 75 to 2000

Best Application

Area

Low-frequency

vibration,

multidirectional

misalignment

Low-frequency vibra-

tion, high-power drive

systems

Multidirectional

misalignment, high

capacity

Large misalignment,

safetied drive

requirements

Diesel engines, low-

frequency vibration,

multidirectional

misalignment

Outstanding

Capabilities

Effectively

accommodates

combinations of

misalignment, high

torsional resilience

Versatility in design

for exact application

requirements

(stiffness and

capacity)

High torque capacity

versus size

Angular misalignment

capability

Fits many standard

fl ywheels, high

torsional

Versatility Factor Widest application

potential of all

elastomeric couplings

Capacity and resil-

ience can be varied

by changing number

and type of spool

Numerous

combinations possible

simply by changing

fl exing elements

Torsional spring rate

varied by changing

modulus or wall

thickness

Large horsepower,

high horsepower

capacity

Fail-Safe

Characteristics Easily incorporated Easily incorporated Inherent Inherent Slip-torque feature

Dynafl ex Elastomeric Flexible Couplings

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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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Page 91 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex® Shear-Type Couplings

Rated: 1/50 to 1 hp at 1750 rpm

LORD Dynafl ex Shear-Type Couplings are compact,

one-piece fl exible couplings economically constructed to

isolate low-frequency vibration and accommodate multi-

directional misalignment.

These couplings reduce the adverse effects of transient

shock torques, torsional vibration, noise and misalign-

ment associated with small equipment drivelines. This

results in longer service life, smoother, quieter operation,

less maintenance, and lower cost for your end product.

Shear-Type fl exible couplings are useful in many small

equipment driveline applications. Multi-directional

misalignment capabilities make them ideally suited for

fractional horsepower drivelines demanding noise reduc-

tion, vibration isolation and maintenance-free operation.

Typical applications include:

• Information Systems – Motor drive, printer rollers,

indexing devices, linear actuator, drives and card

sorters

• Hospital Bed – Actuator drive

• Dynamometer – Driveline

• Tachometer – Driveline

• Pumps, Blowers, Compressors – Driveline

Features and Benefi ts

• High torsional defl ection

• Easy installation

• Versatile application potential - fractional horsepower

couplings are available in a range of sizes to permit

matching a specifi c coupling to your application.

• One-piece construction – convenient for small

equipment with fractional horsepower requirements.

Specifi ed torque rating allows 15° angular defl ection

for excellent vibration isolation.

• Multi-directional misalignment accommodation – elas-

tomeric fl exibility accommodates misalignments up to

1/32 inch parallel, 2° angular.

• Vibration isolation – low torsional stiffness is achieved

with the shear-type fl exible coupling because

the rubber is loaded in shear. This allows for low

system natural frequencies and excellent driveline

disturbances.

• Shock protection – torsional shock loads are attenu-

ated by torsional defl ection of the elastomer. Torsional

fl exibility smooths out rotational disturbances and

protects system components from early fatigue

failure.

• Noise reduction – no metal-to-metal contact; elasto-

meric barrier reduces gear noise, transmission and

motor hum between shifts.

• Maintenance-free – elastomer fl exibility accommo-

dates all motion without metal-to-metal wear, elimi-

nates the need for lubrication.

• Long service life – Dynafl ex Shear-Type Couplings

have proven themselves under demanding service

conditions. Elastomers resist effects of abrasive mate-

rials, oil and grease.

• Attachment – shear-type fl exible couplings are avail-

able in an assortment of bore sizes. Refer to Table 1.

• Constant velocity – inherent design properties

produce a rotational constant velocity.

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Page 92 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Notes: Maximum recommended misalignment - 1/32 inch parallel, 2° angular.

Intrusion should not exceed “E” bore length dimensions.

Coupling Part

Number

Standard Bore

Diameters C

(in)

D Ref.

(in)

E Ref.

(in)

F

(in)

HP at

1750 rpm

Ref.

Torque

Rating

(lb-in)

Static

Torsional

Stiffness

(lb-in/deg)

±20%

Set

Screw

Size

A (in) B (in)

SK-1947-6 0.125 0.125

0.44 0.56 0.36 0.81 1/50 0.8 0.053 5/40

SK-1947 0.187 0.187

SK-1947-19 0.187 0.250

SK-1947-29 0.250 0.250

J-1211-1-2 0.187 0.187 0.63 0.81 0.56 1.38 1/16 2.50 0.17 10/24

J-1211-1-1 0.250 0.250

J-1211-2-2 0.250 0.250

0.75 1.00 0.72 1.75 1/8 5 0.33 10/24

J-1211-2-11 0.250 0.312

J-1211-2-6 0.250 0.375

J-1211-2-3 0.312 0.312

J-1211-2-12 0.312 0.375

J-1211-2-1 0.375 0.375

J-1211-3-4 0.312 0.312

0.88 1.25 0.88 2.13 1/4 10 0.66 1/4-20

J-1211-3-14 0.312 0.375

J-1211-3-12 0.312 0.500

J-1211-3-2 0.375 0.375

J-1211-3-8 0.375 0.500

J-1211-3-1 0.500 0.500

J-1211-4-2 0.375 0.375

1.00 1.38 0.91 2.25 1/3 13 0.87 1/4-20

J-1211-4-35 0.375 0.500

J-1211-4-11 0.375 0.625

J 1211-4-14 0.500 0.500

J-1211-4-4 0.500 0.625

J-1211-4-1 0.625 0.625

J-1211-5-3 0.500 0.500

1.13 1.63 1.00 2.50 1/2 20 1.33 1/4-20

J-1211-5-4 0.500 0.750

J-1211-5-2 0.625 0.625

J-1211-5-1 0.750 0.750

J-1211-6-12 0.500 0.500

1.38 1.81 1.05 2.69 3/4 30 2.00 5/16-18 J-1211-6-18 0.625 0.625

J-1211-6-14 0.625 0.750

J-1211-7-16 0.500 0.750

1.50 2.00 1.11 2.88 1 40 2.66 5/16-18 J-1211-7-9 0.625 0.625

J-1211-7-3 1.00 1.00

Standard Construction: Hubs - steel; Bores - as listed; Set Screws - one per hub furnished but

not installed; Flexing Element - neoprene.

Dynafl ex Shear-Type Couplings

Table 1 – Specifi cations and Dimensions

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Page 93 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Table 2 – Standard Bore Tolerances

Figure 1 – Part Dimensions

Bore Sizes Tolerance

from 0.000 to 0.499 + 0.001 - 0.000

from 0.500 to 0.749 + 0.0015 - 0.0000

from 0.750 to 1.499 + 0.002 - 0.000

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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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Page 95 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex® Spool-Type Couplings

Rated: 5 to 1000 hp at 2000 rpm

LORD Dynafl ex Spool-Type Couplings provide excellent

protection against destructive torsional vibration in high-

torque drive systems.

These couplings are customer-assembled, using

bonded fl exing spools from LORD, and bolted between

customer-supplied metal hubs. Spools should be placed

around recommended bolt circle on hub. Bonded

spools can be installed or replaced with minimum effort.

Coupling assembly has torsional defl ection of 2° under

rated torque.

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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Spool Part

Number

A

Diameter

B

Thickness CThread

Attachement

Minimum Bolt Circle Diameter for Number of Mounts (in)

3456 7 8 9101112

J-4624-1 1.00 0.75 0.38 1/4-20-2A 1.20 1.42 1.70 2.00 2.30 2.62 2.92 3.24 3.56 3.86

J-3424-2 2.00 2.12 0.40 1/2-13-2B 2.30 2.82 3.40 4.00 4.60 5.22 5.84 6.46 7.50 7.72

J-5425-1 3.19 3.00 1.25 1/2-13-2A 3.62 4.41 5.30 6.25 7.18 8.18 9.12 10.20 11.00 12.10

J-5682-1 4.48 2.25 1.25 1/2-20-2A 5.10 6.20 7.45 8.75 10.10 11.50 12.80 14.30 15.70 17.00

Notes: Maximum recommended misalignment - 1/32 inch parallel, 1° angular.

Coupling permits wide latitude in shaft lengths. However, suffi cient spacing between

shaft ends should be provided to allow for shaft end play.

It is suggested that all designs for Spool-Type Flexible Couplings be reviewed with

LORD Corporation.

Construction: Rubber elements - LORD does not supply hubs, elements only;

Metal parts - steel; Flexing element - environmental-resistant elastomer.

Table 2 – Coupling Confi guration Capacity Chart

Torque (lb-in x 100)

Bolt Circle Diameter (in)

Dynafl ex Spool-Type Couplings

Table 1 – Specifi cations and Dimensions

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Page 97 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Figure 1 – Part Dimensions - J-4624-1 Figure 2 – Part Dimensions - J-3424-2

Figure 3 – Part Dimensions - J-5425-1 Figure 4 – Part Dimensions - J-5682-1

Figure 5 – Typical Assembly with Bonded Flexing Spools

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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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Page 99 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex® Bushing-Type Couplings

Rated: 10 to 600 hp at 2000 rpm

LORD Dynafl ex Bushing-Type Couplings accommo-

date misalignment, cushion torsional shock, and do not

generate or transmit noise. Since relative motion is taken

in the elastomer rather than sliding metal surfaces, no

lubricant is involved or ever required. Dirt and grit cannot

effect the coupling bushings. The elastomer has been

compounded to provide long service life.

Typical applications include driveline installations where

multi-directional misalignment must be accommodated

and torque loads are medium to high.

Specifi cation, selection and dimension information

provided on the following pages facilitate design of the

coupling assembly. The bushings are standard parts,

and the fl anges can be supplied by the end user or by

LORD as a special design.

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Page 100 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Selection Guide

Compression bushing-type couplings are assembled

by pressing the elastomeric bushings into sockets of a

coupling fl ange. Once assembled, the coupling can be

used two ways:

• Parallel Arrangement

The driving shaft can be connected to all of the bush-

ings, and the driven shaft connected to the coupling

fl ange. This arrangement loads all bushings in parallel

and produces maximum torque capacity and a less

resilient coupling.

• Series Arrangement

This arrangement requires an even number of bush-

ings per fl ange. Mating fl anges of the driving and

driven shafts are attached to alternate bushings. This

arrangement transmits the torque through the bush-

ings in an N x N series arrangement, thereby making

the torque capacity one-half of the parallel arrange-

ment. The coupling is also more fl exible.

When high torque and small space are the control-

ling factors, the parallel arrangement is recommended.

When misalignment is the controlling factor, the bushings

should be applied in series arrangement.

Table 1 provides selection criteria for parallel arrange-

ment, Table 2 provides data for the series arrangement.

Bushing selection is dependent upon torque require-

ments, angular, parallel and axial misalignments, as well

as bolt circle diameter, number of bushings and bushing

size. The torque values shown on the charts are nominal.

The bushings are capable of withstanding higher torques

due to the shock loads or other short duration surges.

Torsional Flexibility

Bushing-type couplings are relatively stiff torsionally

compared to other elastomeric couplings. The torsional

spring rate of a coupling assembly can be calculated by

using the equation and data provided on the curves.

Example

Required torque capacity – 3400 lb-in

Misalignment – Angular – 1.75°

Axial – 1/8 in

Parallel – 1/32 in

Proposed Coupling – 7 x 7 Series, J-5737-1, (N = 7)

8 in bolt circle

Torsional Spring Rate, Kθ = N R2 KR

2

Kθ = 7 (4)2 4000 = 224,000 lb-in/rad.

2

Caution: Shaft length must be considered for potential

whirl problems.

Recommended Misalignment Limits

Misalignment Bushing Arrangement

Parellel Series

Single

Coupling

Angular 1° 1.75°

Parallel 1/64 in 1/32 in

Axial ±1/16 in ±1/8 in

Double

Coupling

Angular 2° 3.5°

Parallel 3/16 to 1/2 in* 3/8 to 1 in*

Axial ±1/8 in ±1/4 in

Figure 1 – Parallel Arrangement Figure 2 – Series Arrangement

* Dependent on shaft length (10 to 30 in).

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Page 101 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Table 2 – Series Arrangement Selection

Dynafl ex Bushing-Type Couplings

Table 1 – Parallel Arrangement Selection

Bolt Circle (in)

12

10

8

6

4

2

0

BUSHING COUPLING SELECTION — N x N SERIES

Curves Based on Compression

Stress σc = 200 psi

(N x N) 2 x 2 3 x 3 4 x 4 5 x 5 6 x 6 7 x 7

8 x 8

9 x 9

10 x 10

12 x 12

MINIMUM BOLT CIRCLE DIAMETER

Torsional Rate: Kθ = R2KR

Torque: T = σc • R • d • l (lb/in)

Where: σc = Comp. Stress (psi)

N = No. of Joints

R = Bolt Circle Radius

d = joint l.M., O.D.

l = Socket Length

N

2

lb/in

rad

(____)

N

2

Joint

Number

KRMinimum B.C. Dia. "D" For Number of Joints

lb/in 2 3 4 5 6 7 8 9 10 11 12

J-6250-1 6,800 1.77 2.50 3.27 4.05 4.85 5.62 6.41 7.20 8.00 8.78 9.62

J-5915-58 12,000 3.54 5.00 6.52 8.08 9.68 11.25 12.81 14.40 15.98 17.59 19.15

RMIN =

r

Sin ( )

180º

N

Where: r = radius of rubber joint

J-6250-2 4 8 12 16 20 24 28 32 36 40 44 48 52 56

J-5915-58 15 30 45 60 75 90 105 120 135 150 165 180 195 210

Bushing Part No. Torque (lb/in x 100)

J-5915-58

J-5737-1

J-6250-2

12

10

8

6

4

2

0

Bolt Circle (in)

BUSHING COUPLING SELECTION

Curves Based on Compression

Stress σc = 200 psi

lb/in

rad

(____)

Torsional Rate: Kθ = NR2KR

Torque: T = σc •N • R • d • l (lb/in)

Where: σc = Comp. Stress (psi)

N = No. of Joints

R = Bolt Circle Radius

d = joint l.M., O.D.

l = Socket Length

N = 2 3 4 5 6 7 8 9 10 11

12

J-5737-1

J-5915-58

RMIN = r

Sin ( )

180˚

N

Where r = radius of rubber joint

MINIMUM BOLT CIRCLE DIAMETER

J-6250-2

Joint

Number

KRMinimum B.C. Dia. "D" For Number of Joints

lb/in 2 3 4 5 6 7 8 9 10 11 12

J-6250-1 6,800 1.25 1.43 1.77 2.13 2.50 2.89 3.27 3.68 4.05 4.45 4.85

J-5915-58 12,000 2.50 3.00 3.54 4.26 5.00 5.76 6.52 7.32 8.08 8.90 9.68

†

†

J-6250-2 4 8 12 16 20 24 28 32 36 40 44 48 52 56

J-5915-58 15 30 45 60 75 90 105 120 135 150 165 180 195 210

Bushing Part No. Torque (lb/in x 100) † Non-Stock Item

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Page 102 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Figure 3 – Joint Dimensions - J-6250-2

Table 3 – Typical Socket Dimensions

Figure 4 – Joint Dimensions - J-5915-58

Figure 5 – Socket Dimensions

Part

Number

A

Socket

Dia.

B

C

Radius Chamfer x 45°

in mm in mm in mm in mm

J-6250-2 1.00 25.4 0.69 17.5 0.19 4.8 0.13 3.3

J-5915-58 2.19 55.6 1.06 26.9 0.25 6.4 0.19 4.8

Installation Instructions: Use P-80 lube or equivalent mixed to manufacturer’s specifi cations. Immerse rubber

bushing in P-80 solution, making sure entire bushing is wet. Insert bushing into socket by pressing with adequate

force to seat the bushing properly between the retaining lips. Appearance of top and bottom should be uniform after

assembly.

LORD does not supply hubs. Rubber elements only.

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Page 103 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex® LCR Series Couplings

Rated: 4 to 135 hp at 2000 rpm

LORD Dynafl ex LCR Series Couplings are ring-type

couplings developed to overcome numerous torsional

problems associated with vehicular and industrial drive-

line systems. These easily installed couplings reduce

noise transmission and increase bearing and driveline

life through greater misalignment accommodation,

isolation of low frequency disturbances, and isolation of

torsional shock.

These highly fl exible elastomeric couplings for acces-

sory drives are also designed to eliminate lubrication and

maintenance.

Features and Benefi ts

• Misalignment accommodation – elastomeric fl exibility

allows for large angular misalignment. For permissible

misalignments, including axial and radial, Refer to

Table 1.

• Vibration isolation – low torsional spring rate is

achieved with the elastomeric ring-type coupling

using rubber in compression. This allows for low

system natural frequencies and isolation of fi rst mode

driveline disturbances in most driveline systems.

• Shock protection – isolates torsional shock, prevents

backlash and protects system components, including

bearings, from fatigue failure.

• Long service life – Dynafl ex LCR Series Couplings

have proven themselves under demanding service

conditions.

• Maintenance-free – elastomer fl exibility accommo-

dates all motion without wear, eliminates the need for

lubrication.

• Noise reduction – no metal-to-metal contact; elas-

tomer attenuates structure-borne noise and isolates

vibration from components that would act as noise

generators.

• Systems Engineering – LORD has in-house computer

capabilities for multi-torsional analysis to assist in

proper coupling selection.

A part’s listing in this catalog does not guarantee its availability.

To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08

Page 104 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Typical Applications

Dynafl ex LCR Series Couplings are useful for a wide

range of rotary drive applications, from lawn and garden

tractors to large construction equipment, including U-joint

replacement. Typical applications include:

Typical End Product Application

Farm Tractor Trouble-Free Hydraulic Pump Devices

Lawn & Garden Tractors Maintenance-Free Main Drive Couplings

Dynamometer Protects Driveline from Failure

Snowmobile Reliable Main Drive Coupling

Vibratory Rollers Absorbs High Torsional Shock Loads in

Eccentric Drive Units

On- & Off-Highway Isolates and Protects Vehicles Auxiliary

Driveline Systems

Industrial Machinery Provides Inexpensive Coupling for

Maximum Angular Misalignment and

Vibration Control

Agriculture Equipment Replaces Conventional Universal Joints

and Provides Torsional Flexibility

Dynafl ex LCR Series Couplings were designed and

developed by LORD and have been in service since the

early 1960s. The basic concept was intended for specifi c

applications requiring low-cost, fl exible couplings to

accommodate all forms of misalignment and provide

torsional resilience.

The coupling design incorporates metal inserts bonded

in an elastomeric ring, which loads the fl exing element

in compression to transmit torque. Misalignment motion

is accommodated by defl ecting the elastomer in shear,

which allows extreme misalignment without high reaction

forces.

They are ideally suited for light-duty elastomeric universal

joints, particularly where noise reduction or shock attenu-

ation is required.

Absence of metal-to-metal contact through the coupling

eliminates the need for lubrication and maintenance,

while also reducing noise transmissions. Installation

is accomplished by insertion between simple parallel

fl anges. This lightweight coupling element can be

arranged in a single or double series confi guration to

match specifi c torsional stiffness and misalignment

requirements.

Static Load Defl ection Characteristics of

LCR-300-600-046A Reference Curve

Ring-type couplings isolate torsional vibration and

reduce the harmful effects of torsion shock. Torsional

resilience is one important characteristic. Figure 1 shows

the torsional spring rate.

Accommodating axial misalignment along the axis of

shafts without high reaction forces is a unique feature

of ring couplings. Figure 2 shows this load defl ection

relationship.

Ring-type couplings accommodate parallel misalign-

ment with relatively low radial reaction forces imposed

on driving and driven equipment. Figure 3 shows typical

radial load defl ection curves. Load defl ection charac-

teristics for other LCR couplings are available upon

request.

Figure 1 – Typical Load/Defl ection Curves

Figure 2 – Axial Load Defl ection Curves

Figure 3 – Typical Radial Load Defl ection Curves

LCR-300-600-046A

Torque Rating

1440 lb-in

2500

2000

1500

1000

500

0

0 2 4 6 8 10 12

Typical Angle (deg)

Torque (lb-in)

500

400

300

200

100

0

0 0.1 0.2 0.3 0.4 0.5 0.6

Typical Deflection (in)

Load (lb)

LCR-300-600-046A

0 0.1 0.2 0.3 0.4 0.5 0.6

Typical Load Deflection (in)

Load (lb)

LCR-300-600-046A

1000

800

600

200

400

0

1200

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Page 105 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Specifi cations

Materials: The elastomer used in Dynafl ex LCR Series

Couplings is high-quality natural rubber, which meets

LORD specifi cations (available upon request) and

exceeds SAE standards. Natural rubber is used because

of its excellent physical properties such as tensile

strength, tear and abrasion resistance, fatigue resistance

and low temperature characteristics. Other elastomers

are available to meet special applications needs. The

elastomer-to-metal bonds are even stronger than the

elastomers.

Dynafl ex LCR Series Couplings listed on the following

pages have aluminum alloy inserts. Many other

insert confi gurations are possible to meet attachment

requirements.

Environmental: Ring-type couplings will perform satis-

factorily when exposed to the normal fl uid, temperature

and other environmental conditions found in drive-

line systems. Special oil-resistant elastomers can be

provided where total or partial oil immersion is necessary.

For operation in ambient temperatures exceeding 170°F

(77°C), consult LORD Engineering.

Misalignment: Misalignment capability applies for

speeds up to 3500 rpm. Operation up to 7000 rpm is

permitted with reduced misalignment (consult LORD

Engineering).

Note: For speeds above 4000 rpm, shielding is required

and/or balancing of assembly may be required.

Installation: Normal installation involves simple through

bolt attachment to fl anges. For fl ywheel attachment appli-

cations, metal inserts can be tapped/counter-bored to

permit easy installation.

Remote Driven Units: Multiple U-joint shafts (especially

longer shafts) and the speed at which the shaft rotates

(especially higher rpm’s) can create complex stability

problems. To assure satisfactory coupling performance,

all design layouts for remote mounted driven units should

be reviewed by LORD Engineering. LORD analytical

capability is only one part of the engineering service

available on all coupling applications.

LCR ring-type couplings can be selected based on

horsepower or maximum torque requirements. The data

listed on the next page provides the necessary informa-

tion to select a coupling and design it into your system.

New equipment designs and retrofi ts involving recipro-

cating engine drives and unusual driveline arrangements

should be analyzed to avoid potential vibration and

misalignment problems. Contact LORD Engineering for

assistance.

A part’s listing in this catalog does not guarantee its availability.

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Page 106 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex LCR Series Couplings

Table 1 – Specifi cations and Dimensions

Part Number

Rated Performance Characteristics

Torque

Rating 

Per

100 rpm Capacity

Static

Torsional

Rate - Kθ

Axial Rate

- KA

Radial

Rate - KR

Permissible Misalignments

lb-in N-m hp kW

1750 rpm 2000 rpm 3600 rpm lb-in/

rad

N-m/

rad lb/in N/mm lb/in N/mm Angular

Axial Parallel

hp kW hp kW hp kW in mm in mm

LCR-275-400-004A 125 14 0.20 0.15 3.5 2.6 4.0 3.0 7.1 5.3 420 47 150 26 375 66 ±5° ±1/8 3.18 ±1/16 1.59

LCR-275-400-009A 290 33 0.46 0.34 8.1 6.0 9.2 6.9 16.6 12.4 530 60 350 60 850 149 ±4° ±3/32 2.38 ±1/16 1.59

LCR-275-400-017A 550 62 0.87 0.65 15.3 11.4 17.5 13.0 31.4 23.4 1600 181 950 166 1300 228 ±3° ±3/64 1.19 ±1/32 0.79

LCR-300-600-046A 1440 163 2.28 1.70 40.0 29.8 45.7 34.1 82.3 61.3 18000 2034 2300 404 4500 790 ±2° ±1/16 1.59 ±1/32 0.79

LCR-400-800-060A 1900 215 3.01 2.24 52.8 39.3 60.3 45.0 108.5 80.9 24000 2712 1450 254 3000 525 ±2° ±1/16 1.59 ±1/64 0.40

LCR-400-800-115A 3600 407 5.71 4.26 100.0 74.5 114.2 85.2 205.6 153.3 46000 5197 3600 630 6400 1121 ±2° ±1/16 1.59 ±1/64 0.40

LCR-400-800-135A 4200 475 6.66 4.97 116.6 87.0 133.3 99.4 239.9 178.9 63000 7118 4200 736 9000 1576 ±1-1/2° ±1/16 1.59 ±1/64 0.40

LCR-450-600-011A 350 40 0.56 0.42 9.6 7.1 11.1 8.3 20.0 14.9 3100 350 1000 175 420 74 ±5° ±1/8 3.18 ±1/16 1.59

 Torque ratings as listed are maximum steady torques per

application requirements. For general applications, dynamic

torques of ±35 percent of the coupling rate torques can be

applied to the listed torque ratings. Shock torques (e.g.,

start-up torque, etc.) of up to 200 percent rated torque are

generally acceptable.

Torque Requirements:

Torque (lb-in) = 63025 x hp

rpm

Table 2 – Specifi cations and Dimensions

Part Number

Physical Characteristics (Nominal)*

Weight Inertia 

No. of

Inserts

A

B.C. Dia.

B

Hole Dia.

C

Coupling I.D.

D

Coupling I.D.

E

Length

F

Insert Dia.

G

Length

H

Length

lb-

Mass kg lb-in-

sec2

kg-

mm2in mm in mm in mm in mm in mm in mm in mm in mm

LCR-275-400-004A 0.52 0.236 0.0020 226.0 4 2.75 69.85 0.32 8.13 4.00 101.60 1.62 41.15 1.00 25.40 0.91 23.11 0.12 3.18 0.75 19.05

LCR-275-400-009A 0.52 0.236 0.0020 226.0 4 2.75 69.85 0.32 8.13 4.00 101.60 1.62 41.15 1.00 25.40 0.91 23.11 0.12 3.18 0.75 19.05

LCR-275-400-017A 1.00 0.454 0.0038 430.0 4 2.75 69.85 0.32 8.13 4.00 101.60 1.62 41.15 1.75 44.45 0.91 23.11 0.12 3.18 1.50 38.10

LCR-300-600-046A 0.91 0.413 0.0041 463.0 6 3.00 76.20 0.39 9.91 4.06 103.12 1.88 47.75 1.53 38.86 1.00 25.40 0.12 3.18 1.28 32.50

LCR-400-800-060A 1.25 0.567 0.0072 814.0 8 4.00 101.60 0.51 12.95 5.21 132.33 2.74 69.60 1.50 38.10 1.00 25.40 0.12 3.18 1.25 31.75

LCR-400-800-115A 1.25 0.567 0.0072 814.0 8 4.00 101.60 0.51 12.95 5.21 132.33 2.74 69.60 1.50 38.10 1.00 25.40 0.12 3.18 1.25 31.75

LCR-400-800-135A 1.40 0.635 0.0099 111.9 8 4.00 101.60 0.51 12.95 5.21 132.33 2.74 69.60 2.00 50.80 1.00 25.40 0.12 3.18 1.75 44.45

LCR-450-600-011A 0.78 0.354 0.0032 362.0 6 4.50 114.30 0.41 10.30 5.56 141.22 3.40 86.36 0.68 17.27 1.00 25.40 0.12 3.18 0.43 10.92

* See detail drawings by part number for tolerances.

 Does not include bolts or fl anges.

LORD does not supply hubs. LORD supplies ring

elements only.

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Page 107 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Figure 4 – Part Dimensions

Figure 5 – Single Coupling Arrangement Figure 6 – Double Coupling Arrangement

Single coupling arrangement consists of two shafts jointed by a single

coupling for maximum economy.

Double coupling/series arrangement uses two couplings separated

by a fl oating shaft. This provides same torque capacity as single hub

arrangement, with twice the permissible angular misalignment and half

the torsional stiffness. Superior to single coupling for control of torsional

vibration.

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Page 108 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

A part’s listing in this catalog does not guarantee its availability.

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Page 109 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex® LCD Series Couplings

Rated: 75 to 2000 hp at 2000 rpm

LORD Dynafl ex LCD Series Couplings have been

developed to overcome numerous torsional problems

associated with vehicular and industrial driveline

systems. These couplings increase equipment life

by protecting against torsional vibration, shock and

misalignment.

Typical application attachments include:

• Flywheel to shaft

• Flywheel to hub (splined)

• Shaft to shaft

• Floating shaft

Features and Benefi ts

• Protection from torsional shock loads

• Design fl exibility

• Safe for occasional severe overloads

• Vibration isolation – extremely low torsional spring

rate is achieved with the Dynafl ex LCD Series

Coupling, using elastomer in shear. This allows for low

system natural frequencies and isolation of fi rst mode

driveline disturbances.

• Damping at resonance – the elastomer used in

Dynafl ex LCD Series Couplings effectively reduces

vibration at resonance.

• Shock protection – torsional shock loads are attenu-

ated by large shear defl ection of the elastomer. In

the case of severe overloads, equipment damage is

prevented by slippage between the elastomer and

the outer housing.

• Misalignment accommodation – elastomer fl exibility

allows for angular, parallel and axial misalignment.

• Long service life – Dynafl ex LCD Series Couplings

have proven themselves under demanding and

rugged service conditions.

• Maintenance-free – elastomer fl exibility accommo-

dates all motion without wear, eliminates the need for

lubrication.

• Noise reduction – no metal-to-metal contact; elas-

tomer attenuates structure-borne noise and isolates

vibration from components that would act as noise

generators.

• Attachment – fi ts many standard SAE fl ywheels.

• Design fl exibility – standard rubber molds are used

to produce each different size coupling shown in

this catalog. Often it is necessary to change metal

components for custom applications. This is common.

• Systems Engineering – LORD has in-house computer

capabilities for multi-mass torsional analysis to assist

in proper coupling selection.

A part’s listing in this catalog does not guarantee its availability.

To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08

Page 110 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Standardization of Proven Concept

Using the experience gained in designing and producing

special Dynafl ex couplings, LORD has developed a new

standard product line of heavy-duty Dynafl ex couplings.

These couplings have a specially designed elastomeric

element bonded to a metal inner member which is then

preloaded and friction-fi t into an outer member.

This unique concept provides low torsional spring rates

which effectively isolate critical vibratory disturbances in

driveline and accessory systems, thus prolonging equip-

ment life. Misalignment and torsional shock loads are

absorbed by shear defl ection in the elastomeric element.

The ability of the coupling to slip at the outer member

with short duration shock overloads protects the drive-

line and accessory components from premature failure.

The Dynafl ex LCD Series Coupling has been particularly

successful for diesel driven applications.

Dynafl ex LCD Series Couplings are available in 75 to

2000 hp ratings at a nominal 2000 rpm. Each size is also

available in two stiffness values. These are referred to

as the A and C stiffness values. The C stiffness parts are

normally stocked.

Load Defl ection Data

Figures 1 through 3 illustrate the torque or load versus

defl ection characteristics for the -A and -C stiffnesses of

the LCD-0400 size couplings. The general characteristics

of these curves are typical for all Dynafl ex LCD Series

Couplings.

Figure 1 shows the linearity of the coupling spring rate

at (and well above) the rated capacity of 12,500 lb-in

torque. The curves also demonstrate the unique overload

slip characteristic at about 60,000 lb-in torque. It should

be noted, however, that the overload protection results

from slipping of the coupling. This slipping generates

heat, and therefore continuous running at overload could

be injurious to the coupling.

Figures 2 and 3 illustrate the fl exibility of Dynafl ex LCD

Series Couplings to accommodate axial and radial

misalignment. The -A variation is made in a softer elas-

tomer to produce a lower torsional spring rate and there-

fore had the lower axial and radial spring rates. All spring

rates are ideally linear over the normal operating range of

defl ection.

Figure 1 – Torsional Load/Defl ection Curves

Figure 2 – Axial Load Defl ection Curves

Figure 3 – Radial Load Defl ection Curves

Defl ection (in)

Load (lb)

Angular Defl ection (deg)

Torque Load (lb-in) x 000

Defl ection (in)

Load (lb)

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Page 111 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynamic Torsional Stiffness, Kθ

The dynamic torsional stiffness is higher than the static

stiffness at room temperature. When the LCD Series

Couplings are attached to diesel engine fl ywheels, the

elastomer gets warm. At an operating temperature in the

170° to 200°F range, the dynamic stiffness is nearly the

same as the static stiffness at room temperature. The

stiffness values shown in the performance characteristics

chart are for computer modelling and in other types of

torsional analysis work.

Static Load Defl ection Characteristics of

LCD-0400-01-A & -C and LCD-0400-04-A & -C

Curves of other LCD parts show similar characteristics

and are available upon request.

Typical Applications

Dynafl ex LCD Series Couplings are useful for a wide

range of rotary drive applications, from off-highway truck

drivelines to auxiliary compressor drives on diesel loco-

motives. The soft torsional stiffness of these couplings

makes them ideally suited for diesel applications with

remotely mounted driven components. Typical applica-

tions include:

Typical End Product Application

Mining Dump Truck Increases Engine and Transmission Life

Diesel Locomotive Eliminates Accessory Driveline Failure

Portable Air Compressor Replaces Short-Lived Gear Coupling;

Smooth Operation

4-Wheel Drive Farm

Tractor

Reduces Noise and Extends Drive Train

Life

Military Vehicle Eliminates Accessory Shaft Breakage

Dynamometer Prevents Driveline Failure

Mining Dump Truck Prolongs U-Joint Life

In addition, Dynafl ex LCD Series Couplings have been

used in these types of applications:

• Main Drive

Engine – Generator Engine – Compressor

Engine – Transmission Engine – Pump

Electric Motor – Pump Electric Motor – Compressor

• Accessories

Starters Fans and Blowers

Alternators Power Take-Offs

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Page 112 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Selection Guide

This selection guide can be used to determine the size

and series coupling to suit your general requirements.

Final selection of the specifi c coupling to satisfy all of

the application requirements generally necessitates

a system engineering analysis. These computerized

analyses of torsional systems can be provided by LORD

Corporation’s Engineering Department.

Figure 4 – Typical Dynafl ex LCD Coupling

X Series - Type I Housing Couplings (0075, 0150,

0200, 0300) (With Tapered Inner Member)

Note: The LCD-0075-13 design is the same as the “20 Series” except

the outer member fl ange O.D. is very small.

Figure 5 – Typical Dynafl ex LCD Coupling

XX Series - Type II Housing Couplings (0075,

0150, 0200, 0300) (With Flanged Inner Member)

Figure 6 – Typical Dynafl ex LCD Coupling

01 Series - Type III Housing Couplings (400 hp

and above)

Note: 0400-04 has tapered inner member. 0600 and above do not have

tapered inner member.

Figure 7 – Typical Dynafl ex LCD Composite

Outer Member (0075, With Tapered Inner Member)

Dynafl ex

LCD Series

Coupling

Part

Number

Browning Bushing

P/N

Bore Range

Type 1 Dia. Type 2 Dia.

in mm in mm

LCD-0075 Q1 3/4 - 2-1/16 19.05 - 52.3 2-1/8 - 2-11/16 54.0 - 68.3

LCD-0150-XR Q1 3/4 - 2-1/16 19.05 - 52.3 2-1/8 - 2-11/16 54.0 - 68.3

LCD-0200-XR R1 1-1/8 - 2-13/16 28.16 - 71.4 2-7/8 - 3-3/4 73.0 - 95.2

LCD-0300-XR R1 1-1/8 - 2-13/16 28.16 - 71.4 2-7/8 - 3-3/4 73.0 - 95.2

LCD-0400-XX R1 1-1/8 - 2-13/16 28.16 - 71.4 2-7/8 - 3-3/4 73.0 - 95.2

Table 1 – Split Tapered Bushings

Application Note: Sustained operation at torsional resonance can

produce vibratory torques which might cause damage to the coupling

and other driveline components. Please consult LORD Engineering for

application review and approval.

A part’s listing in this catalog does not guarantee its availability.

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Page 113 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Dynafl ex LCD Series Couplings

Table 2 – Rated Performance Characteristics

Part Number* Figure

No.

Capacity per

100 rpm

Torque Rating

TN 

Approximate

Slip Torque 

Torsional Rate

Kθ 

Axial Rate

KA

Radial Rate

KR

Size Variation hp kW lb-in N-m lb-in N-m lb-in/rad N-m/rad lb/in N/mm lb/in N/mm

LCD-0075 -XR-A

-XXR-A

4

44.05 3.02 2,500 282 8,000 900 11,000 1,243 875 153 5,800 1,015

LCD-0075 -XR-C

-XXR-C

4

44.05 3.02 2,500 282 8,000 900 21,000 2,373 2,100 368 10,000 1,750

LCD-0075 



-X-C 7 4.05 3.02 2,500 282 8,000 900 21,000 2,373 2,100 368 10,000 1,750

LCD-0150 -XR-A

-XXR-A

4

58.09 6.04 5,000 565 20,000 2,260 22,000 2,486 1,750 306 11,500 2,012

LCD-0150 -XR-C

-XXR-C

4

58.09 6.04 5,000 565 20,000 2,260 40,000 4,520 4,000 700 20,000 3,500

LCD-0200 -XR-A

-XXR-A

4

511.11 8.29 7,000 791 28,000 3,164 35,000 3,955 2,600 455 14,000 2,450

LCD-0200 -XR-C

-XXR-C

4

511.11 8.29 7,000 791 28,000 3,164 60,000 6,780 5,000 875 22,000 3,850

LCD-0300 -XR-A

-XXR-A

4

515.87 11.84 10.000 1,130 40,000 4,520 50,000 5,650 3,500 612 11,500 2,012

LCD-0300 -XR-C

-XXR-C

4

515.87 11.84 10,000 1,130 40,000 4,520 90,000 10,170 8,800 1,540 20,000 3,500

LCD-0400 -X-A

-XX-A

6

619.83 14.79 12,500 1,412 60,000 6,780 60,000 6,780 1,750 306 12,500 2,188

LCD-0400 -X-C

-XX-C

6

619.83 14.79 12,500 1,412 60,000 6,780 110,000 12,430 5,700 1,000 25,000 4,375

LCD-0600 -X-A

-X-C

6

631.75 23.69 20,000 2,260 85,000 9,600 100,000 11,290 1,600 280 12,500 2,188

LCD-0800 -X-A

-X-C

6

639.67 29.58 25,000 2,825 100,000 11,300 130,000

250,000

14,690

28,250

2,000

6.500

350

1,140

14,000

30,000

2,450

5,250

LCD-1000 -X-A

-X-C

6

652.91 39.47 32,000 3,616 150,000 16,950 250,000

450,000

28,250

50,850

3,250

9,000

600

1,575

20,000

35,000

3,500

6,125

LCD-1500 -X-A

-X-C

6

679.37 59.21 50,000 5,650 200,000 22,600 360,000

650,000

40,680

73,450

4,500

13,000

788

2,275

28,000

50,000

4,900

8,750

LCD-2000 -X-A

-X-C

6

6103.15 77.22 65,000 7,345 200,000 22,600 675,000

1,250,000

76,275

141,250

8,500

15,000

1,488

2,625

58,000

100,000

10,150

17,500

* Please consult LORD engineering for application review,

approval and availability.

 Prolonged exposure to temperatures in the 0°F range and

below produces a signifi cantly reduced slip torque prior to

driveline warm-up. This condition may result in the coupling’s

inability to transmit adequate drive torque for applications

experiencing unusual cold temperature related parasitic

loading.

 Blind assembly style with a notched periphery provides

trouble-free, sliding assembly on fl ywheel drive pins when

bolted access is not possible. Outer member is a composite

material.

 Use Wood’s Sure-Grip® Bushing type SK or equivalent.

 See detail drawings by part number for tolerances.

 Pilot diameter tolerances are + .000/ -.005 in for -A Series

diameters and + .005/ -.000 in for -C Series diameters.

 Tapered.

 Refer to SAE J620c for fl ywheel numbers 6-1/2, 10, 11-1/2,

16; to SAE J927a for numbers 60, 80, 100, 120, 160. See

Tables 5 and 6.

Unless otherwise noted:

.xx dim ± 0.030 in (± 0.762 mm)

.xxx dim ± 0.015 in (± 0.381 mm)

It is advisable to refer to drawing of coupling before

ordering since it is not practical to show all details in this

catalog.

Defi nition of Part Numbering System

Part Type hp Rating Attachment

Variation

Torsional

Stiffness

Variation

LCD -0400 -X

-XX -A

Sure-Grip is a trademark of Altra Industrial Motion, Inc. Torque Requirements:

Torque (lb-in) = 63025 x hp

rpm

A part’s listing in this catalog does not guarantee its availability.

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Page 114 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Table 3 – Specifi cations and Dimensions

Part Number*

Physical Characteristics (Nominal) 

Weight

Mass

Inertia A 

Pilot O.D.

B

B.C. Dia.

C

Dia.

D 

Dia.

E

Dia.

F

Length

Inner

Member

Outer

Member

Size Variation lb kg lb-in-

sec2kg-m2lb-in-

sec2kg-m2in mm in mm in mm in mm in mm in mm

LCD-0075 -XR-A

-XXR-A

6.5

8.3

2.95

3.76 0.04 0.004 0.21

0.35

0.024

0.039

8.500

12.375

215.90

314.33

7.875

11.625

200.03

295.28 2.875

73.03 3.375 85.73

No

Counter

Bore

No

Counter

Bore

2.62 66.55

LCD-0075 -XR-C

-XXR-C

6.5

8.3

2.95

3.87 0.04 0.004 0.21

0.35

0.024

0.039

8.500

12.375

215.90

314.33

7.875

11.625

200.03

295.28 2.875

73.03 3.375 85.73

No

Counter

Bore

No

Counter

Bore

2.62 66.55

LCD-0075 



-X-C 6.3 2.87 0.04 0.004 0.07 0.007 10.340 262.58 9.625 244.48 2.813 71.45 3.313 84.14 2.688 68.28 2.00 50.8

LCD-0150 -XR-A

-XXR-A

20

13.8

9.07

6.26

0.13

0.08

0.015

0.009 0.29 0.033 12.375 314.33 11.625 295.28 2.875

2.500

73.03

63.50

3.375

3.400

85.73

86.36

4.25

4.57

107.95

120.65 2.80 71.12

LCD-0150 -XR-C

-XXR-C

20

13.8

9.07

6.26

0.13

0.08

0.015

0.009 0.29 0.033 12.375 314.33 11.625 295.28 2.875



2.500

73.03



63.50

3.375

3.400

85.73

86.36

4.25

4.57

107.95

120.65 2.80 71.12

LCD-0200 -XR-A

-XXR-A

21

16

9.52

7.26

0.22

0.09

0.025

0.010 0.69 0.078 13.875 352.42 13.125 333.38 4.000



2.500

101.60



63.50

4.625

3.400

117.47

86.36

5.50

5.33

139.70

135.38 2.80 71.12

LCD-0200 -XR-C

-XXR-C

21

16

9.52

7.26

0.22

0.09

0.025

0.010 0.69 0.078 13.875 352.42 13.125 333.38 4.000



2.500

101.60



63.50

4.625

3.400

117.47

86.36

5.50

5.33

139.70

135.38 2.80 71.12

LCD-0300 -XR-A

-XXR-A

33

18

14.96

8.16

0.59

0.25

0.067

0.028 0.92 0.104 13.875 352.42 13.125 333.38 4.000



4.000

101.60



101.60

4.625

5.125

117.47

130.18

6.00

6.69

152.40

170.00 3.06 77.72

LCD-0300 -XR-C

-XXR-C

33

18

14.96

8.16

0.59

0.25

0.067

0.028 0.92 0.104 13.875 352.42 13.125 333.38 4.000



4.000

101.60



101.60

4.625

5.125

117.47

130.18

6.00

6.69

152.40

170.00 3.06 77.72

LCD-0400 -X-A

-XX-A

45

48

20.41

21.77

0.57

0.93

0.065

0.150 2.83 0.320 13.875 352.42 13.125 333.38 6.000



4.000

152.40



101.60

7.000

4.625

177.80

117.47

8.00

6.00

203.20

152.4 2.75 69.85

LCD-0400 -X-C

-XX-C

45

48

20.41

21.77

0.57

0.93

0.065

0.150 2.83 0.320 13.875 352.42 13.125 333.38 6.000



4.000

152.40



101.60

7.000

4.625

177.80

117.47

8.00

6.00

203.20

152.4 2.75 69.85

LCD-0600 -X-A

-X-C 62 28.11 1.12 0.127 5.23 0.591 15.500 393.70 14.625 371.47 6.000

152.40 7.000 177.80 8.00 203.20 3.00 76.20

LCD-0800 -X-A

-X-C 81 36.60 1.25 0.141 8.21 0.928 17.000 431.80 16.250 412.75 7.500 190.50 8.500 215.90 9.50 241.30 3.50 88.90

LCD-1000 -X-A

-X-C 105 47.62 3.51 0.397 14.57 1.647 19.000 482.60 18.125 460.37 8.825 224.16 10.125 257.18 11.52 292.61 4.00 101.60

LCD-1500 -X-A

-X-C 160 72.58 6.23 0.704 32.50 3.673 22.500 622.22 21.375 542.93 10.000 254.00 11.500 292.10 13.25 336.55 4.25 107.95

LCD-2000 -X-A

-X-C 160 72.58 7.40 0.836 31.48 3.557 22.500 622.22 21.375 542.93 11.500 292.19 13.250 336.55 15.25 387.35 4.25 107.95

* Please consult LORD engineering for application review,

approval and availability.

 Prolonged exposure to temperatures in the 0°F range and

below produces a signifi cantly reduced slip torque prior to

driveline warm-up. This condition may result in the coupling’s

inability to transmit adequate drive torque for applications

experiencing unusual cold temperature related parasitic

loading.

 Blind assembly style with a notched periphery provides

trouble-free, sliding assembly on fl ywheel drive pins when

bolted access is not possible. Outer member is a composite

material.

 Use Wood’s Sure-Grip® Bushing type SK or equivalent.

 See detail drawings by part number for tolerances.

 Pilot diameter tolerances are + .000/ -.005 in for -A Series

diameters and + .005/ -.000 in for -C Series diameters.

 Tapered.

 Refer to SAE J620c for fl ywheel numbers 6-1/2, 10, 11-1/2,

16; to SAE J927a for numbers 60, 80, 100, 120, 160. See

Tables 5 and 6.

Unless otherwise noted:

.xx dim ± 0.030 in (± 0.762 mm)

.xxx dim ± 0.015 in (± 0.381 mm)

It is advisable to refer to drawing of coupling before

ordering since it is not practical to show all details in this

catalog.

Defi nition of Part Numbering System

Part Type hp Rating Attachment

Variation

Torsional

Stiffness

Variation

LCD -0400 -X

-XX -A

Sure-Grip is a trademark of Altra Industrial Motion, Inc. Torque Requirements:

Torque (lb-in) = 63025 x hp

rpm

A part’s listing in this catalog does not guarantee its availability.

To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08

Page 115 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Table 4 – Specifi cations and Dimensions

Part Number*

Physical Characteristics (Nominal) 

G

Length

H

Length

I

Length

J

Length

K

Hole Dia. L

No. of

Holes

M

Hole Size

in (mm)

N

No. of

Holes

Fits

SAE 

Flywheel

No.

P

Ref. Dia.

Size Variation in mm in mm in mm in mm in mm in mm

LCD-0075 -XR-A

-XXR-A 0.375 9.53 0.125 3.18 0.25 6.35

No

Counter

Bore

No

Counter

Bore

0.321

0.406

8.15

10.31

6

8

3/8 - 16

UNC-2B 36-1/2

10 6.50 165.1

LCD-0075 -XR-C

-XXR-C 0.375 9.53 0.125 3.18 0.25 6.35

No

Counter

Bore

No

Counter

Bore

0.321

0.406

8.15

10.31

6

8

3/8 - 16

UNC-2B 36-1/2

10 6.50 165.1

LCD-0075 



-X-C – – 0.75 19.1 – – – – 0.710 18.03 6 0.330 (8.38) 3 8 6.80 172.7

LCD-0150 -XR-A

-XXR-A 0.1875 4.76 0.1875 4.76 0.125 3.18 0.75

2.31

19.05

58.72 0.406 10.31 8 3/8-16 UNC-2B

0.394 (10.00)

3

610 8.50 215.9

LCD-0150 -XR-C

-XXR-C 0.1875 4.76 0.1875 4.76 0.125 3.18 0.75

2.31

19.05

58.72 0.406 10.31 8 3/8-16 UNC-2B

0.394 (10.00)

3

610 8.50 215.9

LCD-0200 -XR-A

-XXR-A 0.0625 1.59 0.1875 4.76 – – 0.75

2.56

19.05

65.07 0.406 10.31 16 3/8-16 UNC-2B

0.394 (10.00)

3

6

11-1/2 OR

60/80/100 9.38 238.3

LCD-0200 -XR-C

-XXR-C 0.0625 1.59 0.1875 4.76 – – 0.75

2.56

19.05

65.07 0.406 10.31 16 3/8-16 UNC-2B

0.394 (10.00)

3

6

11-1/2 OR

60/80/100 9.38 238.3

LCD-0300 -XR-A

-XXR-A 0.125 3.18 0.1875 4.76 0.25 6.35 0.75

2.56

19.05

65.07 0.406 10.31 16 3/8-16 UNC-2B

0.660 (16.76)

3

6

11-1/2 OR

60/80/100 11.38 289.1

LCD-0300 -XR-C

-XXR-C 0.125 3.18 0.1875 4.76 0.25 6.35 0.75

2.56

19.05

65.07 0.406 10.31 16 3/8-16 UNC-2B

0.660 (16.76)

3

6

11-1/2 OR

60/80/100 11.38 289.1

LCD-0400 -X-A

-XX-A 0.125 3.18 0.50 12.70 – – 0.88

0.75

22.23

19.05 0.406 10.31 12 1/2-13 UNC-2B

3/8-16 UNC-2B

6

360/80/100 – –

LCD-0400 -X-C

-XX-C 0.125 3.18 0.50 12.70 – – 0.88

0.75

22.23

19.05 0.406 10.31 12 1/2-13 UNC-2B

3/8-16 UNC-2B

6

360/80/100 – –

LCD-0600 -X-A

-X-C – – 0.50 12.70 – – 1.00 25.40 0.406 10.31 12 1/2-13 UNC-2B 6 120 – –

LCD-0800 -X-A

-X-C – – 0.50 12.70 – – 1.00 25.40 0.406 10.31 8 1/2-13 UNC-2B 8 – – –

LCD-1000 -X-A

-X-C 0.125 3.18 0.25 6.35 – – 1.00 25.40 0.406 10.31 12 5/8-11 UNC-2B 8 14 or 140 with

Adapter ––

LCD-1500 -X-A

-X-C 0.125 3.18 0.50 12.70 0.50 12.70 1.50 38.10 0.644 16.36 6 5/8-11 UNC-2B 8 18 or 180 – –

LCD-2000 -X-A

-X-C 0.125 3.18 0.50 12.70 0.50 12.70 1.50 38.10 0.644 16.36 6 3/4-10 UNC-2B 8 18 or 180 – –

–

* Please consult LORD engineering for application review,

approval and availability.

 Prolonged exposure to temperatures in the 0°F range and

below produces a signifi cantly reduced slip torque prior to

driveline warm-up. This condition may result in the coupling’s

inability to transmit adequate drive torque for applications

experiencing unusual cold temperature related parasitic

loading.

 Blind assembly style with a notched periphery provides

trouble-free, sliding assembly on fl ywheel drive pins when

bolted access is not possible. Outer member is a composite

material.

 Use Wood’s Sure-Grip® Bushing type SK or equivalent.

 See detail drawings by part number for tolerances.

 Pilot diameter tolerances are + .000/ -.005 in for -A Series

diameters and + .005/ -.000 in for -C Series diameters.

 Tapered.

 Refer to SAE J620c for fl ywheel numbers 6-1/2, 10, 11-1/2,

16; to SAE J927a for numbers 60, 80, 100, 120, 160. See

Tables 5 and 6.

Unless otherwise noted:

.xx dim ± 0.030 in (± 0.762 mm)

.xxx dim ± 0.015 in (± 0.381 mm)

It is advisable to refer to drawing of coupling before

ordering since it is not practical to show all details in this

catalog.

Defi nition of Part Numbering System

Part Type hp Rating Attachment

Variation

Torsional

Stiffness

Variation

LCD -0400 -X

-XX -A

Sure-Grip is a trademark of Altra Industrial Motion, Inc. Torque Requirements:

Torque (lb-in) = 63025 x hp

rpm

A part’s listing in this catalog does not guarantee its availability.

To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08

Dynafl ex LCD Series Couplings

Installation Guide

Specifi cations

Materials: The elastomer used in the Dynafl ex LCD

Series Coupling is a high-quality natural rubber which

meets LORD specifi cations (available upon request) and

exceeds SAE standards. Natural rubber is used because

of its excellent physical properties, such as tensile

strength, tear and abrasion resistance, fatigue resistance

and low temperature characteristics. The elastomer-to-

metal bonds are even stronger than the elastomers.

Standard LCD catalog parts are all made in two stiff-

nesses of natural rubber. The A elastomer is per LORD

Spec MAP092, having a durometer of approximately

45. The C elastomer is LORD Spec MAP094, having a

durometer of approximately 57. The metal parts for this

series are of alloy steel or ductile iron.

Environmental: Extensive experience with similar

parts indicates that heavy-duty Dynafl ex couplings will

perform satisfactorily when exposed to the normal fl uid,

temperature and other environmental conditions found in

driveline systems. For operation in ambient temperatures

exceeding 170°F (77°C), consult LORD Corporation.

Dynafl ex LCD Series Couplings are often recommended

for use in applications where the temperature is above

170°F (77°C). Temperatures above 200°F (93°C) could

present problems. Customers should know what the

ambient operating temperature is and whether addi-

tional air circulation can be provided. Consultation with

LORD Corporation engineers is necessary if the ambient

temperature is above 170°F (77°C).

Misalignment: Misalignment capability applies to

speeds up to 2500 rpm. Operation up to 3500 rpm

is permitted with reduced misalignment. (Consult

LORD when a potential application requires special

consideration).

At normal rated operating conditions, the Dynafl ex

LCD Series Couplings are designed to accommodate

misalignment.

Angular: 1-1/2° maximum

Parallel: 1/64 inch

Axial: +1/16 inch dynamic

+1/8 inch static

Testing/Performance: Periodic load defl ection tests are

run to assure consistency of torsional spring rate and slip

torque characteristics.

Damping Coeffi cient, Cθ: The natural rubber elastomer

used in LCD couplings offer hysteresis damping which

dissipates energy at resonance.

The “damping coeffi cient” is a function of many vari-

ables. Among them are dynamic strain, frequency,

elastomer type and stiffness, temperature and torque

loading. Damping coeffi cients for this series have been

determined and can be provided for torsional analysis

work by contacting LORD.

Page 116 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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Page 117 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

This arrangement must not be used. Suitable bearing

supports are required to react cardan-induced cocking

loads. Consult LORD Engineering for application review.

Installation

For engine applications, the outer member is usually

bolted directly to the fl ywheel; for other applications, to

a suitable adaptor. The inner member normally attaches

to the driven shaft. The smaller LCD couplings generally

have a tapered bore, which accommodates a standard

split tapered bushing which grips the drive shaft. (Refer

to Table 1 - Split Tapered Bushings). This confi guration

provides easy installation.

Figures 15 and 16 on the next page show typical

installations involving universal joints.

Figure 8

Table 5 – Flywheels for Engine Mounted Torque

Converters - SAE J927 Nov 88

Table 6 – Flywheels for Industrial Engines with

Industrial Power Take-Offs - SAE J620 Oct 88

Figure 9 – Flywheel Drawing for Tables 5 and 6

Converter

Flywheel

No.

B C Tapped Holes

in mm in mm No. Size

20 9.50 241.30 8.750 222.25 12 5/16-18

40 10.375 263.52 9.625 244.48 12 5/16-18

60 13.875 352.42 13.125 333.38 12 3/8-16

80 13.875 352.42 13.125 333.38 12 3/8-16

100 13.875 352.42 13.125 333.38 12 3/8-16

120 15.500 393.70 14.625 371.48 12 3/8-16

140 18.375 466.72 17.250 438.15 12 1/2-13

160 20.375 517.52 19.250 488.95 12 1/2-13

180 22.500 571.52 21.375 542.92 12 5/8-11

210 26.500 673.10 25.250 641.35 12 5/8-11

240 28.875 733.42 27.250 642.15 12 3/4-10

Clutch

Size

B C Tapped Holes

in mm in mm No. Size

165

(6-1/2) 8.500 215.90 7.875 200.02 6 5/16-18

190

(7-1/2) 9.500 241.30 8.750 222.25 8 5/16-18

200

(8) 10.375 263.52 9.625 244.48 6 3/8-16

255

(10) 12.375 314.32 11.625 295.28 8 3/8-16

290

(11-1/2) 13.875 352.42 13.125 333.38 8 3/8-16

355

(14) 18.375 466.72 17.250 438.15 8 1/2-13

405

(16) 20.375 517.52 19.250 488.95 8 1/2-13

460

(18) 22.500 571.50 21.375 542.92 6 5/8-11

530

(21) 26.500 673.10 25.250 641.35 12 5/8-11

610

(24) 28.875 733.42 27.250 692.15 12 3/4-10

A part’s listing in this catalog does not guarantee its availability.

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Page 118 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Figure 10 – Engine Flywheel to Keyed

Shaft - Direct

Typical Installations

Figure 11 – Flywheel to Flanged Shaft - Direct

(LCD -25 Series)

Figure 12 – Flywheel to Flanged Shaft - Direct

(LCD -01 Series)

Figure 13 – Flywheel to Internally Splined Shaft

- Free Floating Splined Connection

Figure 14 – Flywheel to Adapter to Coupling and

Through an Internally Splined Connection

Figure 15 – Stationary Engine to Load by Use

of a Pillow Block on a Common Frame - Permits

Large Drive Angles

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Page 119 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

Figure 16 – Vehicle Engine with Large Angle

Drive Requirements

Figure 17 – Flywheel to Flanged Hub to Splined

Shaft - Free Floating Splined Connection

Figure 18 – Stationary Equipment Having a

Tapered Shaft Connection

Figure 19 – Shaft to Shaft Arrangement Using

Split Taper Bushings at Both Sides

Figure 20 – Two Dynafl ex LCD Couplings in

Series for Increased Flexibility in All Directions

Figure 21 – Stationary Equipment Having Input

Shaft Attached to Coupling Inner Member

A part’s listing in this catalog does not guarantee its availability.

To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08

Dynafl ex LCD Series Couplings

Torsional System Analysis Input

Requirements

Dynafl ex couplings offer unique advantages with the

soft torsional spring rate that isolates torsional vibration,

mitigates shock and reduces noise transmission. In order

to benefi t from these advantages, an analysis must be

made of the application and a coupling selected which

meets the specifi c requirements. The following checklist

sets forth the information required to initiate the analysis:

Application Data

• What is the driving unit, driven unit? Include enough

information to determine disturbing frequencies

(e.g., type of engine, number of cylinders, number of

cycles).

• What is the operating torque (normal, maximum)?

• What is the operating speed (range, at normal torque

and at maximum torque)?

• What are the environmental conditions (temperature,

oil type and amount of exposure, corrosive factors,

other factors)?

Coupling Requirements

• What are the primary functions of the coupling

(torsional vibration isolation, torsional shock

mitigation, noise attenuation, shaft misalignment

accommodation – angular, parallel, axial)?

• If known, what torsional spring rate should the

coupling have?

• If the required torsional spring rate is not known, what

are the rotational moments on inertia of the driving

and driven masses?

• How much misalignment must the coupling

accommodate (angular, parallel, axial)?

• How much, if any, axial thrust will be on the coupling?

Design Parameters

• What space is available for the coupling (maximum

length, diameter)?

• What is the maximum weight the coupling can be, if

weight is limited?

• What are the shaft diameters and method of

attachment (keyway, spline, set screws, fl ange)?

• What special features are required? (Inner member

design – hubs, fl anges, splines, etc. Outer member

design – pilot diameter bolt pattern, etc.)

Remote Driven Units

Multiple U-joint shafts (especially longer shafts) and

the speed at which the shaft rotates (especially higher

rpm’s) can create complex stability problems. To assure

satisfactory coupling performance, all design layouts

for remote mounted driven units should be reviewed

by LORD Engineering. LORD analytical capability is

only one part of the engineering service available on all

coupling applications.

What Else?

If your application is unique or unusual, include any

information that you believe will have an effect on the

coupling design or selection. If you have any questions

as you prepare this data, call us. See following page for

data form.

Reference Literature from Lord Corporation

Design Monograph 1107

Understanding Torsional Vibration

Page 120 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08

Data Required for LORD Coupling Recommendation

Toll Free Number (in United States and Canada): +1 877 ASK LORD (275 5673)

All Information in This Box is Required Data.

Date _____________________________________________ LORD Recommended P/N __________________________

Company Name ___________________________________ Field Engineer ____________________________________

Address __________________________________________ Discussed With ___________________________________

__________________________________________________ Title ______________________________________________

General description of problem and equipment ____________________________________________________________

 Retrofi t  New System

APPLICATION

Driving Unit

* Description __________________________________________________________________________________________

* Model No. _______________________________________ * Manufacturer ____________________________________

*  2-Stroke/Cycle  4-Stroke/Cycle

* Rotational Inertia and Torsional Spring Rate Data (attach tabulated data)

* Radial Support Needed:  Yes  No

Driven Unit

* Description __________________________________________________________________________________________

* Model No. _______________________________________ * Manufacturer ____________________________________

* Rotational Inertia and Torsional Spring Rate Data (attach tabulated data)

* Parasitic Torque required __________lb-ft

SYSTEM DYNAMICS

* Mass elastic schematic of entire system (please attach sketch)

Test data (attach if available)

Speeds of Driving Unit: Idle ________ RPM Normal _________ RPM Maximum ________ RPM

% Time: @ Idle ____________ @ Normal ____________ @ Maximum _____________

Speed Ratio Driving to Driven Unit: __________________________ to ______________________________

* Torque: Normal ___________ lb-ft Maximum _________ lb-ft (@ ___________ RPM)

Present Vibration: Peak-to-Peak Response Maximum __________lb-ft @ ____________ CPM

* Transient Shock: Magnitude: __________________lb-ft

Duration: ____________________milliseconds

How Often: __________________times per hour

* Briefl y describe any peculiarities or special circumstances of the dyanmic system ____________________________

* Required data (OVER)

Page 121 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

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Page 122 of 124

DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS

COUPLING REQUIREMENTS

Primary Function

Shaft Misalignment Specifi c Requirements

__________________Axial _______________Inches

__________________Angular _______________Degrees

__________________Parallel _______________Inches

__________________ Torsional Vibration Isolation _______________% Isolation @ _________RPM

__________________ Torsional Shock Loads _______________Maximum Amplitude

__________________Noise Attenuation

Parameters

* System Operating Temperature: Normal _______ °F Maximum _______ °F Minimum _______ °F

* Environment: Oil Immersion _______________________ Oil Splash ________________________________________

Other ______________________________ Mil Spec _________________________________________

* Space Envelope: Maximum Length ________________ Maximum Diameter ________________________________

* Attachments: Driving  Spline  Flange Driven  Spline  Flange

 Keyways  Set Screws  Keyways  Set Screws

* Shaft Diameters: Driving _____________ Driven ___________________

Fail-Safe Feature Required:  Yes  No

Maximum Allowable Weight: ___________________________

* Minimum Hours Life Required: _______________________

Please attach the following:

1. A layout of the available space envelope and other pertinent drawings showing connecting driv-

eline components.

2. A system mass-elastic diagram including all rotational mass moments of inertia and torsional

stiffnesses.

Remarks ______________________________________________________________________________________________

* Required data

Please return to: LORD Corporation

2000 West Grandview Blvd.

P.O. Box 10038

Erie, PA 16514-0038

Fax: 814 866 1773