Zero Backlash Couplings - DieQua Corporation
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Series EK - Zero Backlash Elastomer Insert Jaw Couplings

In conjunction with R+W coupling technology, DieQua now offers a zero backlash elastomer insert jaw coupling. For those applications requiring higher performance than typical insert couplings, the new EK series provides zero backlash, several clamping styles and four different insert types providing varying degrees of torsional rigidity. These couplings are ideal for maintaining position control while absorbing shocks and vibration. They are an economical solution where the extra cost of bellows or disc designs are not warranted.

Features & Benefits:
  • 8 Models: Provides a variety of connection options.
  • Zero Backlash: Provides exact position and rotary motion.
  • Variable Torsional Rigidity: 4 insert shore values provide different stiffness ratings.
  • Low Inertia: Allows faster acceleration and deceleration with lower torque.
  • Compensates Misalignment: Allows axial, lateral, and angular misalignment for easier mounting.
  • Precision Jaws: Concave design concentrically machined.
  • Electrical Properties: Insulating or conductive options are available.
  • Design Versatility: Mixing and matching hub styles are possible for optimal design solutions.
  • Stainless Steel Optional: Stainless steel hubs and bolts available upon request.
  • Non-Standard Applications: Custom designs, with varied dimensions, tolerances, and keyways are available upon request. Also available with ATEX certification for explosion proof application requirements.
Product Line Overview: Models EKH - EKL - EK1 - EK2 - EK4 - EK6 - EK7 - TX1

Model EKH - Elastomer Insert Coupling with Split Clamping Hub
(6 sizes with rated torque from 20-1600 Nm)

Design Description: Has removable, concentrically machined, hub halves for easy mounting.

Bore Diameters: Metric or inch bores from 8-80 mm, or 0.3125-3.125 inches. Keyways are optional, but not necessary.

Hub Materials: Size 20-450 in aluminum. Size 800 in steel. Stainless steel available for all sizes upon request.

Rated Speed: Up to 4,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EKH-20, EKH-60, EKH-150, EKH-300, EKH-450, EKH-800

Application Example:

Model EKL - Compact Elastomer Insert Coupling with Clamping Hub
(9 sizes with rated torque from 0.2-1000 Nm)

Design Description: Two concentrically machined hubs with single screw clamping connection. Our most compact design!

Bore Diameters: Metric or inch bores from 3-80 mm, or 0.125-3.125 inches. Keyways are optional, but not necessary.

Hub Materials: Size 2-450 in aluminum. Size 800 in steel. Stainless steel available for all sizes upon request.

Rated Speed: Up to 4,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EKL-2, EKL-5, EKL-10, EKL-20, EKL-60, EKL-150, EKL-300, EKL-450, EKL-800

Application Example:

Model EK1 - Elastomer Insert Coupling with Keyway Connection
(9 sizes with rated torque from 0.2-1000 Nm)

Design Description: Two concentrically machined hubs with keyways and set screws.

Bore Diameters: Metric or inch bores from 3-80 mm, or 0.125-3.125 inches. Keyways are optional, but not necessary.

Hub Materials: Size 2-450 in aluminum. Size 800 in steel. Stainless steel available for all sizes upon request.

Rated Speed: Up to 4,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EK1-2, EK1-5, EK1-10, EK1-20, EK1-60, EK1-150, EK1-300, EK1-450, EK1-800

Application Example:

Model EK2 - Elastomer Insert Coupling with Clamping Hub
(6 sizes with rated torque from 10-1000 Nm)

Design Description: Two longer concentrically machined hubs with single screw clamping connection. Our most popular model!

Bore Diameters: Metric or inch bores from 8-80 mm, or 0.3125-3.125 inches. Keyways are optional, but not necessary.

Hub Materials: Size 20-450 in aluminum. Size 800 in steel. Stainless steel available for all sizes upon request.

Rated Speed: Up to 10,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EK2-20, EK2-60, EK2-150, EK2-300, EK2-450, EK2-800

Application Example:

Model EK4 - Elastomer Insert Coupling for Conical Shaft Ends
(3 sizes with rated torque from 20-220 Nm)

Design Description: One end with hollow bore and keyway to accommodate conical shafts. The other end has our standard single screw clamping hub.

Bore Diameters: For clamping hub side, metric or inch bores from 8-35 mm, or 0.3125-1.375 inches. Conical bore dimensions are custom per the customer's request.

Hub Materials: Clamping hub side in aluminum. Conical bore side in steel. Stainless steel available upon request.

Rated Speed: Up to 10,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EK4-20, EK4-60, EK4-150

Application Example:

Model EK6 - Elastomer Insert Coupling with Conical Clamping Ring
(7 sizes with rated torque from 4-1100 Nm)

Design Description: Unique compression clamping design with internal tightening bolts for blind mount applications. No flange access holes are required.

Bore Diameters: Metric or inch bores from 6-80 mm, or 0.25-3.125 inches. Keyways are not possible on this design.

Hub Materials: Size 10-450 in aluminum. Size 800 in steel. Stainless steel available for all sizes upon request.

Rated Speed: Up to 4,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EK6-10, EK6-20, EK6-60, EK6-150, EK6-300, EK6-450, EK6-800

Application Example:

Model EK7 - Elastomer Insert Coupling with Expanding Shaft
(8 sizes with rated torque from 1.5-1000 Nm)

Design Description: Unique design with our standard single screw clamp on one side and an expanding shaft on the other for connecting to hollow bores without a key.

Bore Diameters: For clamping hub side, metric or inch bores from 4-80 mm, or 0.25-3.125 inches. On the expanding shaft side, metric or inch diameters of 10-80 mm, or 0.5-3.125 inches. Keyways are available, but not necessary, on the clamping side. Keys are not possible on the expanding side.

Hub Materials: Clamping side size 5-450 in aluminum. Size 800 and all expanding shaft sides in steel. Stainless steel available for all sizes upon request.

Rated Speed: Up to 4,000 RPM standard. Higher with balancing.

Temperature Range: See insert specification chart below.

Sizes: EK7-5, EK7-10, EK7-20, EK7-60, EK7-150, EK7-300, EK7-450, EK7-800

Application Example:

Model TX1 - Plastic Jaw Coupling with Keyway Connection
(5 sizes with rated torque from 4-405 Nm)

Design Description: Low cost coupling with concentrically molded hubs with keyways and set screws. Most appropriate for higher volume applications.

Bore Diameters: Metric or inch bores from 6-45 mm, or 0.25-1.75 inches.

Hub Materials: High strength fiber reinforced plastic.

Rated Speed: From 6,000 to 10,000 RPM depending on size.

Temperature Range: From -20° C to +100° C (-5° F to +200° F).

Sizes: TX1-10, TX1-20, TX1-60, TX1-150, TX1-300

Application Example:

Download Catalog

Download TX1 CAD Drawings

Installation & Maintenance

Other Elastomer Insert Products:
Torque Limiters
Line Shafts
Model ES2
Elastomer insert adjustable torque limiter with single screw clamping hub and 4 disengagement styles.
Model EZ2
Elastomer insert line shaft with split clamping hub.
Model ESL
Economy class elastomer insert torque limiter with keyway or clamping connection.
Model EZV
Elastomer insert line shaft with variable length and split clamping hub.

Coupling Insert Options, Temperature Ranges, and Stiffness Ratings:

The elastomer inserts are made of thermoplastic polyurethane (TPU), in a variety of shore values. To provide different stiffness and vibration damping characteristics, optional Hytrel® material can be offered for higher temperature applications.

The inserts are pre-stressed during assembly which provides zero backlash, more consistant load sharing, and improved restoring forces for precise positioning and repeatability.

Type A
Standard
Type B
High Stiffness
Type C
Low Stiffness
Type D
Electrically Conductive
Type
Shore
Hardness
Color
Relative
Damping
Temperature
Range
Properties
A
98 Sh A
Red
0.4 - 0.5
-30° C to +100° C
High Damping
B
64 Sh D
Green
0.3 - 0.45
-30° C to +120° C
High Torsional Stiffness
C
80 Sh A
Yellow
0.3 - 0.4
-30° C to +100° C
Very High Damping
D*
92 Sh A
Black
0.3 - 0.45
-10° C to +70° C
Electrically Conductive*

* Due to the electrically conductive properties of the insert, electrostatically charging of the coupling is prevented. This eliminates sparks during normal operation in explosive areas. Technical data is available upon request.

The values of the relative damping were determined at 10 Hz and 20˚C.


Compensates for Misalignment:

The elastomer insert jaw coupling can compensate for axial, lateral (parallel), and angular misalignment. This aids in assembly and reduces load stress on drive bearings. It is important to consider the maximum values highlighted in the catalog to avoid premature wear of the elastomer element.

Lateral Misalignment
Angular Misalignment
Axial Misalignment

What's Next?
Email Your Application
Download These Catalogs
Download CAD Drawings
Download Coupling Overview

Why Choose DieQua?

Have Any Questions?
Call Us: 630-980-1133

Quick Assist:
Installation & Maintenance Instructions PDF - 824KB
Application Examples
Misalignment Compensation
Elastomer Insert Options & Specifications
Selection Service Factors

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Related Products:
Bellows Couplings
Elastomer Insert Couplings
Miniature Couplings
Torque Limiters
Line Shafts

Coupling Overview:

Sample Applications:
Encoders
General Mechanical Engineering
Industrial Robots
Linear Actuators
Linking Screw Jacks
Machine Tools
Measurement and Positioning Units
Packaging Machinery
Plant Automation
Printing Machinery
Servo Drives
and more...

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Bloomingdale, IL 60108-3105
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