DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 87 of 124
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 flexible 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 flexible 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 benefits available to the powertrain designer. LORD
Corporation’s product lines include five different elas-
tomeric coupling styles which cover a wide range of
application requirements.
Dynaflex® Elastomeric Flexible
Couplings
Featuring: Dynaflex® Shear-Type Couplings
Dynaflex® Spool-Type Couplings
Dynaflex® Bushing-Type Couplings
Dynaflex® LCR Series Couplings
Dynaflex® LCD Series Couplings
Application
Efficient 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.
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 fill specific
application requirements.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 89 of 124
Coupling Application Guide
Dynaflex
Shear-Type
Dynaflex
Spool-Type
Dynaflex
Bushing-Type
Dynaflex
LCR Series
Dynaflex
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- Multidirectional
tion, high-power drive misalignment, high
Large misalignment,
safetied drive
requirements
Diesel engines, low-
frequency vibration,
multidirectional
systems
capacity
misalignment
Outstanding
Capabilities
Effectively
Versatility in design
for exact application
requirements
High torque capacity
versus size
Angular misalignment Fits many standard
accommodates
combinations of
misalignment, high
torsional resilience
capability
flywheels, high
torsional
(stiffness and
capacity)
Versatility Factor
Widest application
potential of all
elastomeric couplings by changing number
and type of spool
Capacity and resil-
ience can be varied
Numerous
Torsional spring rate
Large horsepower,
high horsepower
capacity
combinations possible varied by changing
simply by changing
flexing elements
modulus or wall
thickness
Fail-Safe
Characteristics
Easily incorporated
Easily incorporated
Inherent
Inherent
Slip-torque feature
Dynaflex Elastomeric Flexible Couplings
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 90 of 124
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 91 of 124
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 Benefits
• High torsional deflection
• Easy installation
• Versatile application potential - fractional horsepower
couplings are available in a range of sizes to permit
matching a specific coupling to your application.
• One-piece construction – convenient for small
equipment with fractional horsepower requirements.
Specified torque rating allows 15° angular deflection
for excellent vibration isolation.
• Multi-directional misalignment accommodation – elas-
tomeric flexibility accommodates misalignments up to
1/32 inch parallel, 2° angular.
• Vibration isolation – low torsional stiffness is achieved
with the shear-type flexible coupling because
the rubber is loaded in shear. This allows for low
system natural frequencies and excellent driveline
disturbances.
Dynaflex® Shear-Type Couplings
Rated: 1/50 to 1 hp at 1750 rpm
• Shock protection – torsional shock loads are attenu-
ated by torsional deflection of the elastomer. Torsional
flexibility smooths out rotational disturbances and
protects system components from early fatigue
failure.
LORD Dynaflex Shear-Type Couplings are compact,
one-piece flexible couplings economically constructed to
isolate low-frequency vibration and accommodate multi-
directional misalignment.
• Noise reduction – no metal-to-metal contact; elasto-
meric barrier reduces gear noise, transmission and
motor hum between shifts.
• Maintenance-free – elastomer flexibility accommo-
dates all motion without metal-to-metal wear, elimi-
nates the need for lubrication.
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.
• Long service life – Dynaflex Shear-Type Couplings
have proven themselves under demanding service
conditions. Elastomers resist effects of abrasive mate-
rials, oil and grease.
• Attachment – shear-type flexible couplings are avail-
able in an assortment of bore sizes. Refer to Table 1.
• Constant velocity – inherent design properties
produce a rotational constant velocity.
Shear-Type flexible 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.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 92 of 124
Dynaflex Shear-Type Couplings
Table 1 – Specifications and Dimensions
Static
Standard Bore
HP at
1750 rpm
Ref.
Torque
Rating
(lb-in)
Torsional
Stiffness
(lb-in/deg)
20%
Set
Screw
Size
Diameters
Coupling Part
Number
C
(in)
D Ref.
(in)
E Ref.
(in)
F
(in)
A (in) B (in)
SK-1947-6
SK-1947
0.125
0.187
0.187
0.250
0.187
0.250
0.250
0.250
0.250
0.312
0.312
0.375
0.312
0.312
0.312
0.375
0.375
0.500
0.375
0.375
0.375
0.500
0.500
0.625
0.500
0.500
0.625
0.750
0.500
0.625
0.625
0.500
0.625
1.00
0.125
0.187
0.250
0.250
0.187
0.250
0.250
0.312
0.375
0.312
0.375
0.375
0.312
0.375
0.500
0.375
0.500
0.500
0.375
0.500
0.625
0.500
0.625
0.625
0.500
0.750
0.625
0.750
0.500
0.625
0.750
0.750
0.625
1.00
0.44
0.63
0.56
0.81
0.36
0.56
0.81
1.38
1/50
1/16
0.8
0.053
0.17
5/40
SK-1947-19
SK-1947-29
J-1211-1-2
J-1211-1-1
J-1211-2-2
J-1211-2-11
J-1211-2-6
J-1211-2-3
J-1211-2-12
J-1211-2-1
J-1211-3-4
J-1211-3-14
J-1211-3-12
J-1211-3-2
J-1211-3-8
J-1211-3-1
J-1211-4-2
J-1211-4-35
J-1211-4-11
J 1211-4-14
J-1211-4-4
J-1211-4-1
J-1211-5-3
J-1211-5-4
J-1211-5-2
J-1211-5-1
J-1211-6-12
J-1211-6-18
J-1211-6-14
J-1211-7-16
J-1211-7-9
J-1211-7-3
2.50
10/24
0.75
1.00
0.72
1.75
1/8
5
0.33
10/24
0.88
1.25
0.88
2.13
1/4
10
0.66
1/4-20
1.00
1.13
1.38
1.63
0.91
1.00
2.25
2.50
1/3
1/2
13
20
0.87
1.33
1/4-20
1/4-20
1.38
1.50
1.81
2.00
1.05
1.11
2.69
2.88
3/4
1
30
40
2.00
2.66
5/16-18
5/16-18
Notes: Maximum recommended misalignment - 1/32 inch parallel, 2° angular.
Standard Construction: Hubs - steel; Bores - as listed; Set Screws - one per hub furnished but
not installed; Flexing Element - neoprene.
Intrusion should not exceed “E” bore length dimensions.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 93 of 124
Figure 1 – Part Dimensions
Table 2 – Standard Bore Tolerances
Bore Sizes
Tolerance
from 0.000 to 0.499
from 0.500 to 0.749
from 0.750 to 1.499
+ 0.001 - 0.000
+ 0.0015 - 0.0000
+ 0.002 - 0.000
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 94 of 124
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 95 of 124
Dynaflex® Spool-Type Couplings
Rated: 5 to 1000 hp at 2000 rpm
LORD Dynaflex Spool-Type Couplings provide excellent
protection against destructive torsional vibration in high-
torque drive systems.
These couplings are customer-assembled, using
bonded flexing 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 deflection of 2° under
rated torque.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 96 of 124
Dynaflex Spool-Type Couplings
Table 1 – Specifications and Dimensions
Minimum Bolt Circle Diameter for Number of Mounts (in)
Spool Part
Number
A
B
Thread
Attachement
C
Diameter Thickness
3
4
5
6
7
8
9
10
11
12
J-4624-1
J-3424-2
J-5425-1
J-5682-1
1.00
2.00
3.19
4.48
0.75
2.12
3.00
2.25
0.38
0.40
1.25
1.25
1/4-20-2A
1/2-13-2B
1/2-13-2A
1/2-20-2A
1.20 1.42 1.70
2.30 2.82 3.40
3.62 4.41 5.30
5.10 6.20 7.45
2.00
4.00
6.25
2.30
4.60
7.18
2.62
5.22
8.18
2.92
5.84
3.24
6.46
3.56
7.50
3.86
7.72
9.12 10.20 11.00 12.10
8.75 10.10 11.50 12.80 14.30 15.70 17.00
Notes: Maximum recommended misalignment - 1/32 inch parallel, 1° angular.
It is suggested that all designs for Spool-Type Flexible Couplings be reviewed with
LORD Corporation.
Coupling permits wide latitude in shaft lengths. However, sufficient spacing between
shaft ends should be provided to allow for shaft end play.
Construction: Rubber elements - LORD does not supply hubs, elements only;
Metal parts - steel; Flexing element - environmental-resistant elastomer.
Table 2 – Coupling Configuration Capacity Chart
Torque (lb-in x 100)
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 97 of 124
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
Page 98 of 124
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 99 of 124
Dynaflex® Bushing-Type Couplings
Rated: 10 to 600 hp at 2000 rpm
LORD Dynaflex 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.
Specification, selection and dimension information
provided on the following pages facilitate design of the
coupling assembly. The bushings are standard parts,
and the flanges can be supplied by the end user or by
LORD as a special design.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 100 of 124
Selection Guide
Torsional Flexibility
Compression bushing-type couplings are assembled
by pressing the elastomeric bushings into sockets of a
coupling flange. Once assembled, the coupling can be
used two ways:
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.
• Parallel Arrangement
Example
Required torque capacity – 3400 lb-in
The driving shaft can be connected to all of the bush-
ings, and the driven shaft connected to the coupling
flange. This arrangement loads all bushings in parallel
and produces maximum torque capacity and a less
resilient coupling.
Misalignment – Angular – 1.75°
Axial – 1/8 in
Parallel – 1/32 in
• Series Arrangement
Proposed Coupling – 7 x 7 Series, J-5737-1, (N = 7)
8 in bolt circle
This arrangement requires an even number of bush-
ings per flange. Mating flanges 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 flexible.
Torsional Spring Rate, K = N R2 K
θ
R
2
K = 7 (4)2 4000 = 224,000 lb-in/rad.
θ
2
Caution: Shaft length must be considered for potential
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.
whirl problems.
Recommended Misalignment Limits
Bushing Arrangement
Misalignment
Parellel
1°
Series
1.75°
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.
Angular
Parallel
Axial
Single
Coupling
1/64 in
1/16 in
2°
1/32 in
1/8 in
Angular
Parallel
Axial
3.5°
Double
Coupling
3/16 to 1/2 in*
1/8 in
3/8 to 1 in*
1/4 in
* Dependent on shaft length (10 to 30 in).
Figure 1 – Parallel Arrangement
Figure 2 – Series Arrangement
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 101 of 124
Dynaflex Bushing-Type Couplings
Table 1 – Parallel Arrangement Selection
lb/in
rad
2
(____)
Torsional Rate: K = NR K
BUSHING COUPLING SELECTION
R
θ
Curves Based on Compression
Torque: T = σ •N • R • d • l (lb/in)
c
Stress σ = 200 psi
Where: σ = Comp. Stress (psi)
d = joint l.M., O.D.
l = Socket Length
c
c
N = No. of Joints
R = Bolt Circle Radius
N = 2
3
4
5
6
7
8
9
10
11
12
10
8
12
J-5915-58
R
r
J-5737-1
MIN =
180˚
N
6
Sin (
)
J-6250-2
K
Where r = radius of rubber joint
4
Minimum B.C. Dia. "D" For Number of Joints
10
Joint
Number
R
lb/in
2
3
4
5
6
7
8
9
11
12
†
J-6250-1
6,800
12,000
1.25 1.43 1.77 2.13 2.50 2.89 3.27 3.68 4.05 4.45 4.85
2.50 3.00 3.54 4.26 5.00 5.76 6.52 7.32 8.08 8.90 9.68
2
†
J-5915-58
0
J-6250-2
J-5915-58
4
15
8
30
12
45
16
60
20
75
24
90
28
105
32
120
36
135
40
150
44
165
48
180
52
195
56
210
Bushing Part No.
Torque (lb/in x 100)
† Non-Stock Item
Table 2 – Series Arrangement Selection
BUSHING COUPLING SELECTION — N x N SERIES
Curves Based on Compression
9 x 9
8 x 8
Stress σ = 200 psi
c
(N x N)
2 x 2
3 x 3
4 x 4
5 x 5
6 x 6
7 x 7
10 x 10
12 x 12
12
10
8
N
2
lb/in
(____)
rad
2
Torsional Rate: K
=
R K
R
θ
•
N
2
Torque: T = σ
R • d • l (lb/in)
c
6
Where: σ = Comp. Stress (psi)
d = joint l.M., O.D.
l = Socket Length
c
N = No. of Joints
R = Bolt Circle Radius
4
K
r
Minimum B.C. Dia. "D" For Number of Joints
10
Joint
Number
R
lb/in
2
3
4
5
6
7
8
9
11
12
R
MIN
=
180º
N
Sin (
)
2
J-6250-1
J-5915-58
6,800
12,000
1.77 2.50 3.27 4.05 4.85 5.62 6.41 7.20 8.00 8.78 9.62
3.54 5.00 6.52 8.08 9.68 11.25 12.81 14.40 15.98 17.59 19.15
Where: r = radius of rubber joint
0
J-6250-2
J-5915-58
4
15
8
30
12
45
16
60
20
75
24
90
28
105
32
120
36
135
40
150
44
165
48
180
52
195
56
210
Bushing Part No.
Torque (lb/in x 100)
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 102 of 124
Figure 3 – Joint Dimensions - J-6250-2
Figure 4 – Joint Dimensions - J-5915-58
Table 3 – Typical Socket Dimensions
Figure 5 – Socket Dimensions
A
C
Socket
Dia.
B
Part
Number
Chamfer x 45°
Radius
in
mm
in
mm
in
mm
4.8
6.4
in
mm
3.3
4.8
J-6250-2
1.00 25.4 0.69 17.5 0.19
2.19 55.6 1.06 26.9 0.25
0.13
0.19
J-5915-58
LORD does not supply hubs. Rubber elements only.
Installation Instructions: Use P-80 lube or equivalent mixed to manufacturer’s specifications. 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.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 103 of 124
Dynaflex® LCR Series Couplings
Rated: 4 to 135 hp at 2000 rpm
LORD Dynaflex 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 flexible elastomeric couplings for acces-
sory drives are also designed to eliminate lubrication and
maintenance.
Features and Benefits
• Misalignment accommodation – elastomeric flexibility
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 first 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 – Dynaflex LCR Series Couplings
have proven themselves under demanding service
conditions.
• Maintenance-free – elastomer flexibility 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.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 104 of 124
Accommodating axial misalignment along the axis of
shafts without high reaction forces is a unique feature
of ring couplings. Figure 2 shows this load deflection
relationship.
Typical Applications
Dynaflex 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:
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 deflection curves. Load deflection charac-
teristics for other LCR couplings are available upon
request.
Typical End Product
Application
Farm Tractor
Trouble-Free Hydraulic Pump Devices
Lawn & Garden Tractors Maintenance-Free Main Drive Couplings
Dynamometer
Snowmobile
Protects Driveline from Failure
Reliable Main Drive Coupling
Vibratory Rollers
Absorbs High Torsional Shock Loads in
Eccentric Drive Units
Figure 1 – Typical Load/Deflection Curves
On- & Off-Highway
Industrial Machinery
Isolates and Protects Vehicles Auxiliary
Driveline Systems
2500
LCR-300-600-046A
Provides Inexpensive Coupling for
Maximum Angular Misalignment and
Vibration Control
2000
Torque Rating
1440 lb-in
1500
Agriculture Equipment
Replaces Conventional Universal Joints
and Provides Torsional Flexibility
1000
500
0
Dynaflex LCR Series Couplings were designed and
developed by LORD and have been in service since the
early 1960s. The basic concept was intended for specific
applications requiring low-cost, flexible couplings to
accommodate all forms of misalignment and provide
torsional resilience.
0
2
4
6
8
10
12
Typical Angle (deg)
Figure 2 – Axial Load Deflection Curves
The coupling design incorporates metal inserts bonded
in an elastomeric ring, which loads the flexing element
in compression to transmit torque. Misalignment motion
is accommodated by deflecting the elastomer in shear,
which allows extreme misalignment without high reaction
forces.
500
400
LCR-300-600-046A
300
200
100
0
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
flanges. This lightweight coupling element can be
arranged in a single or double series configuration to
match specific torsional stiffness and misalignment
requirements.
0
0.1 0.2 0.3 0.4 0.5 0.6
Typical Deflection (in)
Figure 3 – Typical Radial Load Deflection Curves
1200
1000
LCR-300-600-046A
800
600
400
Static Load Deflection 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.
200
0
0
0.1 0.2 0.3 0.4 0.5 0.6
Typical Load Deflection (in)
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 105 of 124
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.
Specifications
Materials: The elastomer used in Dynaflex LCR Series
Couplings is high-quality natural rubber, which meets
LORD specifications (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.
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.
Dynaflex LCR Series Couplings listed on the following
pages have aluminum alloy inserts. Many other
insert configurations are possible to meet attachment
requirements.
New equipment designs and retrofits involving recipro-
cating engine drives and unusual driveline arrangements
should be analyzed to avoid potential vibration and
misalignment problems. Contact LORD Engineering for
assistance.
Environmental: Ring-type couplings will perform satis-
factorily when exposed to the normal fluid, 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 flanges. For flywheel attachment appli-
cations, metal inserts can be tapped/counter-bored to
permit easy installation.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 106 of 124
Dynaflex LCR Series Couplings
Table 1 – Specifications and Dimensions
Rated Performance Characteristics
Static
Torque
Rating ꢀ
Per
100 rpm
Axial Rate
Radial
Rate - K
Capacity
2000 rpm
Torsional
Permissible Misalignments
- K
Part Number
A
R
Rate - K
θ
1750 rpm
3600 rpm
Axial
Parallel
N-m/
rad
lb-in/
rad
Angular
N/mm
N/mm
lb-in N-m
hp
kW
lb/in
lb/in
hp
3.5
kW
2.6
hp
4.0
kW
3.0
hp
7.1
kW
5.3
in
mm
in
mm
125
290
14 0.20
33 0.46
62 0.87
163 2.28
215 3.01
407 5.71
475 6.66
40 0.56
0.15
0.34
0.65
1.70
2.24
4.26
4.97
0.42
420
530
47
150
350
26
60
375
850
66
149
228
790
525
1121
1576
74
5°
4°
1/8 3.18
3/32 2.38
3/64 1.19
1/16 1.59
1/16 1.59
1/16 1.59
1/16 1.59
1/8 3.18
1/16
1/16
1/32
1/32
1/64
1/64
1/64
1/16
1.59
1.59
0.79
0.79
0.40
0.40
0.40
1.59
LCR-275-400-004A
LCR-275-400-009A
LCR-275-400-017A
LCR-300-600-046A
LCR-400-800-060A
LCR-400-800-115A
LCR-400-800-135A
LCR-450-600-011A
8.1
15.3
40.0
52.8
100.0
116.6
9.6
6.0
9.2
17.5
6.9
16.6
31.4
12.4
23.4
60
181
550
11.4
29.8
39.3
74.5
87.0
7.1
13.0
34.1
45.0
85.2
99.4
8.3
1600
950
166
404
254
630
736
175
1300
4500
3000
6400
9000
420
3°
1440
1900
3600
4200
350
45.7
82.3
61.3
18000
24000
46000
63000
3100
2034
2712
5197
7118
350
2300
1450
3600
4200
1000
2°
60.3
108.5
205.6
239.9
20.0
80.9
2°
114.2
133.3
11.1
153.3
178.9
14.9
2°
1-1/2°
5°
ꢀ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 – Specifications and Dimensions
Physical Characteristics (Nominal)*
Weight
A
B
C
D
E
F
G
H
Inertia ꢁ
Part Number
B.C. Dia.
Hole Dia.
Coupling I.D.
Coupling I.D.
Length
Insert Dia.
Length
Length
No. of
Inserts
lb-
lb-in-
sec2
kg-
kg
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
Mass
0.52
0.52
1.00
0.91
1.25
1.25
1.40
0.78
mm2
226.0
226.0
430.0
463.0
814.0
814.0
111.9
362.0
0.236
0.236
0.454
0.413
0.567
0.567
0.635
0.354
0.0020
0.0020
0.0038
0.0041
0.0072
0.0072
0.0099
0.0032
4
4
4
6
8
8
8
6
2.75
2.75
2.75
3.00
69.85
69.85
69.85
76.20
0.32
0.32
0.32
0.39
0.51
0.51
0.51
0.41
8.13
8.13
4.00
4.00
4.00
4.06
5.21
5.21
5.21
5.56
101.60
101.60
101.60
103.12
132.33
132.33
132.33
141.22
1.62
1.62
1.62
1.88
2.74
2.74
2.74
3.40
41.15
41.15
41.15
47.75
69.60
69.60
69.60
86.36
1.00
1.00
1.75
1.53
1.50
1.50
2.00
0.68
25.40
25.40
44.45
38.86
38.10
38.10
50.80
17.27
0.91
0.91
0.91
1.00
1.00
1.00
1.00
1.00
23.11
23.11
23.11
25.40
25.40
25.40
25.40
25.40
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
3.18
3.18
3.18
3.18
3.18
3.18
3.18
3.18
0.75
0.75
1.50
1.28
1.25
1.25
1.75
0.43
19.05
19.05
38.10
32.50
31.75
31.75
44.45
10.92
LCR-275-400-004A
LCR-275-400-009A
LCR-275-400-017A
LCR-300-600-046A
LCR-400-800-060A
LCR-400-800-115A
LCR-400-800-135A
LCR-450-600-011A
8.13
9.91
4.00 101.60
4.00 101.60
4.00 101.60
4.50 114.30
12.95
12.95
12.95
10.30
LORD does not supply hubs. LORD supplies ring
elements only.
* See detail drawings by part number for tolerances.
ꢁDoes not include bolts or flanges.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 107 of 124
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 floating 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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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 108 of 124
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 109 of 124
Features and Benefits
• Protection from torsional shock loads
• Design flexibility
• Safe for occasional severe overloads
• Vibration isolation – extremely low torsional spring
rate is achieved with the Dynaflex LCD Series
Coupling, using elastomer in shear. This allows for low
system natural frequencies and isolation of first mode
driveline disturbances.
• Damping at resonance – the elastomer used in
Dynaflex LCD Series Couplings effectively reduces
vibration at resonance.
• Shock protection – torsional shock loads are attenu-
ated by large shear deflection 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 flexibility
allows for angular, parallel and axial misalignment.
• Long service life – Dynaflex LCD Series Couplings
have proven themselves under demanding and
rugged service conditions.
• Maintenance-free – elastomer flexibility 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 – fits many standard SAE flywheels.
• Design flexibility – 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.
Dynaflex® LCD Series Couplings
Rated: 75 to 2000 hp at 2000 rpm
LORD Dynaflex 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
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 110 of 124
Figure 1 – Torsional Load/Deflection Curves
Standardization of Proven Concept
Using the experience gained in designing and producing
special Dynaflex couplings, LORD has developed a new
standard product line of heavy-duty Dynaflex couplings.
These couplings have a specially designed elastomeric
element bonded to a metal inner member which is then
preloaded and friction-fit 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 deflection in the elastomeric element.
Angular Deflection (deg)
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 Dynaflex LCD Series Coupling has been particularly
successful for diesel driven applications.
Figure 2 – Axial Load Deflection Curves
Dynaflex 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 Deflection Data
Figures 1 through 3 illustrate the torque or load versus
deflection characteristics for the -A and -C stiffnesses of
the LCD-0400 size couplings. The general characteristics
of these curves are typical for all Dynaflex LCD Series
Couplings.
Deflection (in)
Figure 3 – Radial Load Deflection Curves
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 flexibility of Dynaflex 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
deflection.
Deflection (in)
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 111 of 124
Dynamic Torsional Stiffness, K
Typical Applications
θ
The dynamic torsional stiffness is higher than the static
stiffness at room temperature. When the LCD Series
Couplings are attached to diesel engine flywheels, the
Dynaflex 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-
elastomer gets warm. At an operating temperature in the motives. The soft torsional stiffness of these couplings
170° to 200°F range, the dynamic stiffness is nearly the
same as the static stiffness at room temperature. The
makes them ideally suited for diesel applications with
remotely mounted driven components. Typical applica-
stiffness values shown in the performance characteristics tions include:
chart are for computer modelling and in other types of
Typical End Product
Application
torsional analysis work.
Mining Dump Truck
Diesel Locomotive
Increases Engine and Transmission Life
Eliminates Accessory Driveline Failure
Static Load Deflection 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.
Portable Air Compressor Replaces Short-Lived Gear Coupling;
Smooth Operation
4-Wheel Drive Farm
Tractor
Reduces Noise and Extends Drive Train
Life
Military Vehicle
Dynamometer
Eliminates Accessory Shaft Breakage
Prevents Driveline Failure
Mining Dump Truck
Prolongs U-Joint Life
In addition, Dynaflex LCD Series Couplings have been
used in these types of applications:
• Main Drive
Engine – Generator
Engine – Transmission
Electric Motor – Pump
• Accessories
Engine – Compressor
Engine – Pump
Electric Motor – Compressor
Starters
Alternators
Fans and Blowers
Power Take-Offs
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 112 of 124
Selection Guide
Figure 6 – Typical Dynaflex LCD Coupling
01 Series - Type III Housing Couplings (400 hp
and above)
This selection guide can be used to determine the size
and series coupling to suit your general requirements.
Final selection of the specific 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 Dynaflex LCD Coupling
X Series - Type I Housing Couplings (0075, 0150,
0200, 0300) (With Tapered Inner Member)
Note: 0400-04 has tapered inner member. 0600 and above do not have
tapered inner member.
Figure 7 – Typical Dynaflex LCD Composite
Outer Member (0075, With Tapered Inner Member)
Note: The LCD-0075-13 design is the same as the “20 Series” except
the outer member flange O.D. is very small.
Figure 5 – Typical Dynaflex LCD Coupling
XX Series - Type II Housing Couplings (0075,
0150, 0200, 0300) (With Flanged Inner Member)
Table 1 – Split Tapered Bushings
Browning Bushing
Dynaflex
LCD Series
Coupling
Part
Bore Range
P/N
Type 1 Dia.
Type 2 Dia.
in mm
Number
in
mm
3/4 - 2-1/16
19.05 - 52.3
19.05 - 52.3
28.16 - 71.4
28.16 - 71.4
28.16 - 71.4
2-1/8 - 2-11/16 54.0 - 68.3
LCD-0075
Q1
Q1
R1
R1
R1
3/4 - 2-1/16
2-1/8 - 2-11/16 54.0 - 68.3
LCD-0150-XR
LCD-0200-XR
LCD-0300-XR
LCD-0400-XX
1-1/8 - 2-13/16
1-1/8 - 2-13/16
1-1/8 - 2-13/16
2-7/8 - 3-3/4
2-7/8 - 3-3/4
2-7/8 - 3-3/4
73.0 - 95.2
73.0 - 95.2
73.0 - 95.2
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.
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 113 of 124
Dynaflex LCD Series Couplings
Table 2 – Rated Performance Characteristics
Capacity per
100 rpm
Torque Rating
Approximate
Slip Torque ꢀ
Torsional Rate
K ꢀ
Axial Rate
Radial Rate
Part Number*
Figure
No.
T
ꢀ
K
K
N
θ
A
R
Variation
Size
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
4
4.05
3.02
2,500
2,500
282
8,000
900
900
11,000
21,000
21,000
22,000
40,000
35,000
60,000
50,000
90,000
60,000
110,000
100,000
1,243
2,373
2,373
2,486
4,520
3,955
6,780
5,650
10,170
6,780
12,430
11,290
875
2,100
2,100
1,750
4,000
2,600
5,000
3,500
8,800
1,750
5,700
1,600
153
368
5,800
1,015
1,750
1,750
2,012
3,500
2,450
3,850
2,012
3,500
2,188
4,375
2,188
LCD-0075
-XR-C
-XXR-C
4
4
4.05
4.05
3.02
3.02
282
282
8,000
8,000
10,000
10,000
11,500
20,000
14,000
22,000
11,500
20,000
12,500
25,000
12,500
-X-C
LCD-0075 ꢁ
7
2,500
900
368
ꢂ
LCD-0150
LCD-0150
LCD-0200
LCD-0200
LCD-0300
LCD-0300
LCD-0400
LCD-0400
LCD-0600
LCD-0800
LCD-1000
LCD-1500
LCD-2000
-XR-A
-XXR-A
4
5
8.09
6.04
5,000
565
20,000
20,000
28,000
28,000
40,000
40,000
60,000
60,000
85,000
2,260
2,260
3,164
3,164
4,520
4,520
6,780
6,780
9,600
306
-XR-C
-XXR-C
4
5
8.09
6.04
5,000
565
700
-XR-A
-XXR-A
4
5
11.11
11.11
15.87
15.87
19.83
19.83
31.75
39.67
52.91
79.37
103.15
8.29
7,000
791
455
-XR-C
-XXR-C
4
5
8.29
7,000
791
875
-XR-A
-XXR-A
4
5
11.84
11.84
14.79
14.79
23.69
29.58
39.47
59.21
77.22
10.000
10,000
12,500
12,500
20,000
25,000
32,000
50,000
65,000
1,130
1,130
1,412
1,412
2,260
2,825
3,616
5,650
7,345
612
-XR-C
-XXR-C
4
5
1,540
306
-X-A
-XX-A
6
6
-X-C
-XX-C
6
6
1,000
280
-X-A
-X-C
6
6
-X-A
-X-C
6
6
130,000
250,000
14,690
28,250
2,000
6.500
350
1,140
14,000
30,000
2,450
5,250
100,000 11,300
150,000 16,950
200,000 22,600
200,000 22,600
-X-A
-X-C
6
6
250,000
450,000
28,250
50,850
3,250
9,000
600
1,575
20,000
35,000
3,500
6,125
-X-A
-X-C
6
6
360,000
650,000
40,680
73,450
4,500
13,000
788
2,275
28,000
50,000
4,900
8,750
-X-A
-X-C
6
6
675,000
1,250,000
76,275
141,250
8,500
15,000
1,488
2,625 100,000
58,000
10,150
17,500
ꢂ Use Wood’s Sure-Grip® Bushing type SK or equivalent.
ꢃ See detail drawings by part number for tolerances.
* Please consult LORD engineering for application review,
approval and availability.
It is advisable to refer to drawing of coupling before
ordering since it is not practical to show all details in this
catalog.
ꢄ Pilot diameter tolerances are + .000/ -.005 in for -A Series
diameters and + .005/ -.000 in for -C Series diameters.
ꢀ Prolonged exposure to temperatures in the 0°F range and
below produces a significantly 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.
Definition of Part Numbering System
ꢅ Tapered.
Torsional
Stiffness
Variation
Attachment
Variation
Part Type
hp Rating
ꢆ Refer to SAE J620c for flywheel numbers 6-1/2, 10, 11-1/2,
16; to SAE J927a for numbers 60, 80, 100, 120, 160. See
Tables 5 and 6.
-X
-XX
ꢁ Blind assembly style with a notched periphery provides
trouble-free, sliding assembly on flywheel drive pins when
bolted access is not possible. Outer member is a composite
material.
LCD
-0400
-A
Unless otherwise noted:
.xx dim 0.030 in ( 0.762 mm)
.xxx dim 0.015 in ( 0.381 mm)
Torque Requirements:
Sure-Grip is a trademark of Altra Industrial Motion, Inc.
Torque (lb-in) = 63025 x hp
rpm
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
Download from Www.Somanuals.com. All Manuals Search And Download.
DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 114 of 124
Table 3 – Specifications and Dimensions
Physical Characteristics (Nominal) ꢃ
Inertia
Part Number*
Weight
Mass
B
C
Dia.
E
Dia.
F
A ꢄ
Pilot O.D.
D ꢄ
Dia.
Inner
Outer
B.C. Dia.
Length
Member
Member
lb-in-
lb-in-
kg-m2
kg-m2
Size
Variation lb
kg
in
mm
in
mm
in
mm
in
mm
in
mm
in mm
sec2
sec2
No
Counter
Bore
No
Counter
Bore
LCD-0075
-XR-A
-XXR-A
6.5
8.3
2.95
3.76
0.21
0.35
0.024
0.039 12.375
8.500
215.90
314.33
7.875
11.625
200.03
295.28
0.04
0.004
2.875ꢅ
73.03ꢅ
3.375
85.73
2.62
66.55
No
Counter
Bore
No
Counter
Bore
LCD-0075
-XR-C
-XXR-C
6.5
8.3
2.95
3.87
0.21
0.35
0.024
0.039 12.375
8.500
215.90
314.33
7.875
11.625
200.03
295.28
0.04
0.04
0.004
0.004
2.875ꢅ
73.03ꢅ
3.375
3.313
85.73
84.14
2.62
2.00
66.55
50.8
-X-C
6.3
2.87
0.07
0.007 10.340
262.58
9.625
244.48
2.813
71.45
2.688
68.28
LCD-0075 ꢁ
ꢂ
LCD-0150
LCD-0150
LCD-0200
LCD-0200
LCD-0300
LCD-0300
LCD-0400
LCD-0400
LCD-0600
LCD-0800
LCD-1000
LCD-1500
LCD-2000
-XR-A
-XXR-A
20
13.8
9.07
6.26
0.13
0.08
0.015
0.009
2.875
2.500
73.03
63.50
3.375
3.400
85.73
86.36
4.25
4.57
107.95
120.65
0.29
0.29
0.69
0.69
0.92
0.92
2.83
2.83
5.23
8.21
14.57
32.50
31.48
0.033 12.375
0.033 12.375
0.078 13.875
0.078 13.875
0.104 13.875
0.104 13.875
0.320 13.875
0.320 13.875
0.591 15.500
0.928 17.000
1.647 19.000
3.673 22.500
3.557 22.500
314.33
314.33
352.42
352.42
352.42
352.42
352.42
352.42
393.70
431.80
482.60
622.22
622.22
11.625
11.625
13.125
13.125
13.125
13.125
13.125
13.125
14.625
16.250
18.125
21.375
21.375
295.28
295.28
333.38
333.38
333.38
333.38
333.38
333.38
371.47
412.75
460.37
542.93
542.93
2.80
2.80
2.80
2.80
3.06
3.06
2.75
2.75
3.00
3.50
71.12
71.12
71.12
71.12
77.72
77.72
69.85
69.85
76.20
88.90
-XR-C
-XXR-C
20
13.8
9.07
6.26
0.13
0.08
0.015
0.009
3.375
3.400
85.73
86.36
4.25
4.57
107.95
120.65
2.875ꢅ
2.500
73.03ꢅ
63.50
-XR-A
-XXR-A
21
16
9.52
7.26
0.22
0.09
0.025
0.010
4.625 117.47
3.400 86.36
5.50
5.33
139.70
135.38
4.000ꢅ 101.60ꢅ
2.500 63.50
-XR-C
-XXR-C
21
16
9.52
7.26
0.22
0.09
0.025
0.010
4.625 117.47
3.400 86.36
5.50
5.33
139.70
135.38
4.000ꢅ 101.60ꢅ
2.500 63.50
-XR-A
-XXR-A
33 14.96
18 8.16
0.59
0.25
0.067
0.028
4.625 117.47
5.125 130.18
6.00
6.69
152.40
170.00
4.000ꢅ 101.60ꢅ
4.000 101.60
-XR-C
-XXR-C
33 14.96
18 8.16
0.59
0.25
0.067
0.028
4.625 117.47
5.125 130.18
6.00
6.69
152.40
170.00
4.000ꢅ 101.60ꢅ
4.000 101.60
-X-A
-XX-A
45 20.41
48 21.77
0.57
0.93
0.065
0.150
7.000 177.80
4.625 117.47
8.00
6.00
203.20
152.4
6.000ꢅ 152.40ꢅ
4.000 101.60
-X-C
-XX-C
45 20.41
48 21.77
0.57
0.93
0.065
0.150
7.000 177.80
4.625 117.47
8.00
6.00
203.20
152.4
6.000ꢅ 152.40ꢅ
4.000 101.60
-X-A
-X-C
62 28.11
81 36.60
105 47.62
160 72.58
160 72.58
1.12
1.25
3.51
6.23
7.40
0.127
0.141
0.397
0.704
0.836
6.000ꢅ 152.40ꢅ
7.000 177.80
8.500 215.90
10.125 257.18
11.500 292.10
13.250 336.55
8.00
9.50
203.20
241.30
292.61
336.55
387.35
-X-A
-X-C
7.500
8.825
190.50
224.16
254.00
292.19
-X-A
-X-C
11.52
13.25
15.25
4.00 101.60
4.25 107.95
4.25 107.95
-X-A
-X-C
10.000
11.500
-X-A
-X-C
ꢂ Use Wood’s Sure-Grip® Bushing type SK or equivalent.
ꢃ See detail drawings by part number for tolerances.
* Please consult LORD engineering for application review,
approval and availability.
It is advisable to refer to drawing of coupling before
ordering since it is not practical to show all details in this
catalog.
ꢄ Pilot diameter tolerances are + .000/ -.005 in for -A Series
diameters and + .005/ -.000 in for -C Series diameters.
ꢀ Prolonged exposure to temperatures in the 0°F range and
below produces a significantly 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.
Definition of Part Numbering System
ꢅ Tapered.
Torsional
Stiffness
Variation
Attachment
Variation
Part Type
hp Rating
ꢆ Refer to SAE J620c for flywheel numbers 6-1/2, 10, 11-1/2,
16; to SAE J927a for numbers 60, 80, 100, 120, 160. See
Tables 5 and 6.
-X
-XX
ꢁ Blind assembly style with a notched periphery provides
trouble-free, sliding assembly on flywheel drive pins when
bolted access is not possible. Outer member is a composite
material.
LCD
-0400
-A
Unless otherwise noted:
.xx dim 0.030 in ( 0.762 mm)
.xxx dim 0.015 in ( 0.381 mm)
Torque Requirements:
Sure-Grip is a trademark of Altra Industrial Motion, Inc.
Torque (lb-in) = 63025 x hp
rpm
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 115 of 124
Table 4 – Specifications and Dimensions
Physical Characteristics (Nominal) ꢃ
Part Number*
G
H
I
J
K
Fits
SAE ꢆ
Flywheel
No.
P
L
M
N
Length
Length
Length
Length
Hole Dia.
Ref. Dia.
No. of Hole Size No. of
Holes
in (mm)
Holes
Size
Variation
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
No
Counter
Bore
No
Counter
Bore
LCD-0075
6-1/2
10
-XR-A
-XXR-A
0.321
0.406
8.15
10.31
6
8
3/8 - 16
UNC-2B
3
0.375
9.53
0.125
3.18
0.25
6.35
6.50
165.1
No
Counter
Bore
No
Counter
Bore
LCD-0075
-XR-C
-XXR-C
6-1/2
10
0.321
0.406
8.15
10.31
6
8
3/8 - 16
UNC-2B
3
3
0.375
–
9.53
–
0.125
0.75
3.18
19.1
0.25
–
6.35
–
6.50
6.80
165.1
172.7
-X-C
–
–
0.710
18.03
6
0.330 (8.38)
8
LCD-0075 ꢁ
ꢂ
–
LCD-0150
LCD-0150
LCD-0200
LCD-0200
LCD-0300
LCD-0300
LCD-0400
LCD-0400
LCD-0600
LCD-0800
LCD-1000
LCD-1500
LCD-2000
-XR-A
-XXR-A
0.75
2.31
19.05
58.72
3/8-16 UNC-2B
0.394 (10.00)
3
6
0.1875
0.1875
0.0625
0.0625
0.125
0.125
0.125
0.125
–
4.76
4.76
1.59
1.59
3.18
3.18
3.18
3.18
–
0.1875
0.1875
0.1875
0.1875
0.1875
0.1875
0.50
4.76
4.76
0.125
3.18
0.406
0.406
0.406
0.406
0.406
0.406
0.406
0.406
0.406
0.406
0.406
0.644
0.644
10.31
10.31
10.31
10.31
10.31
10.31
10.31
10.31
10.31
10.31
10.31
16.36
16.36
8
10
10
8.50
215.9
-XR-C
-XXR-C
0.75
2.31
19.05
58.72
3/8-16 UNC-2B
0.394 (10.00)
3
6
0.125
3.18
8
8.50
215.9
-XR-A
-XXR-A
0.75
2.56
19.05
65.07
3/8-16 UNC-2B
0.394 (10.00)
3
6
11-1/2 OR
60/80/100
4.76
–
–
–
16
16
16
16
12
12
12
8
9.38
238.3
-XR-C
-XXR-C
0.75
2.56
19.05
65.07
3/8-16 UNC-2B
0.394 (10.00)
3
6
11-1/2 OR
60/80/100
4.76
–
9.38
238.3
-XR-A
-XXR-A
0.75
2.56
19.05
65.07
3/8-16 UNC-2B
0.660 (16.76)
3
6
11-1/2 OR
60/80/100
4.76
0.25
0.25
–
6.35
11.38
289.1
-XR-C
-XXR-C
0.75
2.56
19.05
65.07
3/8-16 UNC-2B
0.660 (16.76)
3
6
11-1/2 OR
60/80/100
4.76
6.35
11.38
289.1
-X-A
-XX-A
0.88
0.75
22.23
19.05
1/2-13 UNC-2B
3/8-16 UNC-2B
6
3
12.70
12.70
12.70
12.70
6.35
–
60/80/100
60/80/100
120
–
–
–
–
–
–
–
–
–
–
–
–
–
–
-X-C
-XX-C
0.88
0.75
22.23
19.05
1/2-13 UNC-2B
3/8-16 UNC-2B
6
3
0.50
–
–
-X-A
-X-C
0.50
–
–
–
1.00
1.00
1.00
1.50
1.50
25.40
25.40
25.40
38.10
38.10
1/2-13 UNC-2B
1/2-13 UNC-2B
5/8-11 UNC-2B
5/8-11 UNC-2B
3/4-10 UNC-2B
6
8
8
8
8
-X-A
-X-C
–
–
0.50
–
–
-X-A
-X-C
14 or 140 with
Adapter
0.125
0.125
0.125
3.18
3.18
3.18
0.25
–
–
12
6
-X-A
-X-C
0.50
12.70
12.70
0.50
0.50
12.70
12.70
18 or 180
18 or 180
-X-A
-X-C
0.50
6
ꢂ Use Wood’s Sure-Grip® Bushing type SK or equivalent.
ꢃ See detail drawings by part number for tolerances.
* Please consult LORD engineering for application review,
approval and availability.
It is advisable to refer to drawing of coupling before
ordering since it is not practical to show all details in this
catalog.
ꢄ Pilot diameter tolerances are + .000/ -.005 in for -A Series
diameters and + .005/ -.000 in for -C Series diameters.
ꢀ Prolonged exposure to temperatures in the 0°F range and
below produces a significantly 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.
Definition of Part Numbering System
ꢅ Tapered.
Torsional
Stiffness
Variation
Attachment
Variation
Part Type
hp Rating
ꢆ Refer to SAE J620c for flywheel numbers 6-1/2, 10, 11-1/2,
16; to SAE J927a for numbers 60, 80, 100, 120, 160. See
Tables 5 and 6.
-X
-XX
ꢁ Blind assembly style with a notched periphery provides
trouble-free, sliding assembly on flywheel drive pins when
bolted access is not possible. Outer member is a composite
material.
LCD
-0400
-A
Unless otherwise noted:
.xx dim 0.030 in ( 0.762 mm)
.xxx dim 0.015 in ( 0.381 mm)
Torque Requirements:
Sure-Grip is a trademark of Altra Industrial Motion, Inc.
Torque (lb-in) = 63025 x hp
rpm
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 116 of 124
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).
Dynaflex LCD Series Couplings
Installation Guide
Specifications
Materials: The elastomer used in the Dynaflex LCD
Series Coupling is a high-quality natural rubber which
meets LORD specifications (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.
At normal rated operating conditions, the Dynaflex
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
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.
Testing/Performance: Periodic load deflection tests are
run to assure consistency of torsional spring rate and slip
torque characteristics.
Damping Coefficient, C : The natural rubber elastomer
θ
used in LCD couplings offer hysteresis damping which
dissipates energy at resonance.
Environmental: Extensive experience with similar
parts indicates that heavy-duty Dynaflex couplings will
perform satisfactorily when exposed to the normal fluid,
temperature and other environmental conditions found in
driveline systems. For operation in ambient temperatures
exceeding 170°F (77°C), consult LORD Corporation.
Dynaflex 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).
The “damping coefficient” is a function of many vari-
ables. Among them are dynamic strain, frequency,
elastomer type and stiffness, temperature and torque
loading. Damping coefficients for this series have been
determined and can be provided for torsional analysis
work by contacting LORD.
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 117 of 124
Installation
Table 5 – Flywheels for Engine Mounted Torque
Converters - SAE J927 Nov 88
For engine applications, the outer member is usually
bolted directly to the flywheel; 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 configuration
provides easy installation.
Converter
Flywheel
No.
B
C
Tapped Holes
in
mm
in
mm
No.
Size
20
40
9.50 241.30
8.750 222.25
9.625 244.48
12
12
12
12
12
12
12
12
12
12
12
5/16-18
5/16-18
3/8-16
3/8-16
3/8-16
3/8-16
1/2-13
1/2-13
5/8-11
5/8-11
3/4-10
10.375 263.52
60
13.875 352.42 13.125 333.38
13.875 352.42 13.125 333.38
13.875 352.42 13.125 333.38
15.500 393.70 14.625 371.48
18.375 466.72 17.250 438.15
20.375 517.52 19.250 488.95
22.500 571.52 21.375 542.92
26.500 673.10 25.250 641.35
28.875 733.42 27.250 642.15
80
100
120
140
160
180
210
240
Figures 15 and 16 on the next page show typical
installations involving universal joints.
Figure 8
Table 6 – Flywheels for Industrial Engines with
Industrial Power Take-Offs - SAE J620 Oct 88
B
C
Tapped Holes
Clutch
Size
in
mm
in
mm
No.
Size
165
8.500 215.90
9.500 241.30
10.375 263.52
7.875 200.02
8.750 222.25
9.625 244.48
6
5/16-18
(6-1/2)
This arrangement must not be used. Suitable bearing
supports are required to react cardan-induced cocking
loads. Consult LORD Engineering for application review.
190
(7-1/2)
8
6
5/16-18
3/8-16
3/8-16
3/8-16
1/2-13
1/2-13
5/8-11
5/8-11
3/4-10
200
(8)
255
(10)
12.375 314.32 11.625 295.28
13.875 352.42 13.125 333.38
18.375 466.72 17.250 438.15
20.375 517.52 19.250 488.95
22.500 571.50 21.375 542.92
26.500 673.10 25.250 641.35
28.875 733.42 27.250 692.15
8
Figure 9 – Flywheel Drawing for Tables 5 and 6
290
(11-1/2)
8
355
(14)
8
405
(16)
8
460
(18)
6
530
(21)
12
12
610
(24)
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 118 of 124
Typical Installations
Figure 10 – Engine Flywheel to Keyed
Shaft - Direct
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 Figure 15 – Stationary Engine to Load by Use
Through an Internally Splined Connection
of a Pillow Block on a Common Frame - Permits
Large Drive Angles
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 119 of 124
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 Dynaflex LCD Couplings in
Series for Increased Flexibility in All Directions
Figure 21 – Stationary Equipment Having Input
Shaft Attached to Coupling Inner Member
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 120 of 124
Remote Driven Units
Dynaflex LCD Series Couplings
Torsional System Analysis Input
Requirements
Dynaflex couplings offer unique advantages with the
soft torsional spring rate that isolates torsional vibration,
mitigates shock and reduces noise transmission. In order
to benefit from these advantages, an analysis must be
made of the application and a coupling selected which
meets the specific requirements. The following checklist
sets forth the information required to initiate the analysis:
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.
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).
Reference Literature from Lord Corporation
Design Monograph 1107
Understanding Torsional Vibration
• 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, flange)?
• What special features are required? (Inner member
design – hubs, flanges, splines, etc. Outer member
design – pilot diameter bolt pattern, etc.)
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 121 of 124
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____________________________________________________________
ꢇ Retrofit
ꢇ New System
APPLICATION
Driving Unit
* Description __________________________________________________________________________________________
* Model No. _______________________________________ * Manufacturer ____________________________________
* ꢇ 2-Stroke/Cycle
ꢇ 4-Stroke/Cycle
* Rotational Inertia and Torsional Spring Rate Data (attach tabulated data)
* Radial Support Needed: ꢇ Yes
ꢇ 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
% Time: @ Idle____________ @ Normal ____________
Speed Ratio Driving to Driven Unit:__________________________ to ______________________________
* Torque: Normal___________ lb-ft Maximum _________ lb-ft (@ ___________RPM)
Normal _________ RPM
Maximum ________ RPM
@ Maximum _____________
Present Vibration: Peak-to-Peak Response Maximum __________lb-ft @ ____________CPM
* Transient Shock: Magnitude: __________________lb-ft
Duration: ____________________milliseconds
How Often: __________________times per hour
* Briefly describe any peculiarities or special circumstances of the dyanmic system____________________________
* Required data
(OVER)
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
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DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Page 122 of 124
COUPLING REQUIREMENTS
Primary Function
Shaft Misalignment
Specific Requirements
__________________Axial
_______________Inches
__________________Angular
_______________Degrees
__________________Parallel
_______________Inches
__________________Torsional Vibration Isolation
__________________Torsional Shock Loads
__________________Noise Attenuation
_______________% Isolation @ _________RPM
_______________Maximum Amplitude
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 ꢇ Spline
ꢇ Keyways
ꢇ Flange
Driven
ꢇ Spline
ꢇ Flange
ꢇ Set Screws
ꢇ Keyways
ꢇ Set Screws
* Shaft Diameters: Driving_____________ Driven___________________
Fail-Safe Feature Required: ꢇ Yes ꢇ 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
A part’s listing in this catalog does not guarantee its availability.
Rev.1 10/08
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