REXNORD Omega Elastomeric Coupling Installation Guide

REXNORD Omega Elastomeric Coupling

Product Information

Specifications

• Product Name: Omega Couplings
• Manufacturer: Regal Rexnord Corporation
• Application Engineering Contact: 800-626-2093 or PTSAppEng@regalrexnord.com
• Website: https://www.rexnord.com/Omega

Frequently Asked Questions

What is the purpose of Omega Couplings?

• Omega Couplings are designed to provide a mechanical connection between rotating shafts of mechanical equipment while accommodating misalignment and transmitting power and torque between the shafts.

Who is the manufacturer of Omega Couplings?

• The manufacturer of Omega Couplings is Regal Rexnord Corporation.

How can I contact the Application Engineering department?

• You can contact the Application Engineering department by calling 800-626-2093 or emailing PTSAppEng@regalrexnord.com.

Are there any safety precautions I need to take when using Omega Couplings?

Yes, safety should be a primary concern during installation, operation, and maintenance of the couplings. All rotating power transmission products are potentially dangerous and must be guarded in compliance with relevant safety standards. Failure to secure cap screws properly could cause personal injury. Consult Regal Rexnord before installing the coupling on systems involving certain sensitive devices. Elastomeric couplings can hold a static electric charge, so both shafts of the connected equipment must have a path to ground in explosive environments.

How often should I perform visual inspections on the coupling?

• Periodic visual inspections are necessary to evaluate the condition of the coupling and ensure it is functioning properly.
• Refer to the manufacturer’s guidelines for inspection frequency and procedures.

Warnings

Danger: Indicates a hazard which, if not avoided, will result in serious injury or death.
Warning: Indicates a hazard which, if not avoided, could result in serious injury or death.
Caution: Indicates a hazard which, if not avoided, could result in minor or moderate personal injury.
Notice: Indicates information considered important, but not hazardrelated (e.g. messages relating to property damage).

GENERAL SAFETY INSTRUCTIONS

Warning

• Read and follow all instructions carefully.
• Disconnect and lock out power before installation and maintenance. Working on or near energized equipment can result in severe injury.
• Do not operate equipment without guards in place. Exposed equipment can result in severe injury or death.
• Read and understand the information in this section and in this manual completely before installing, operating or maintaining this equipment. Failure to follow this instruction could result in severe injury or death.

Caution

• Perform periodic inspections. Equipment may fail prematurely and could become unsafe if not properly inspected and maintained.
• Failure to follow this instruction could result in mild or moderate personal injury.

General Information

1. Omega Couplings are designed to provide a mechanical connection between the rotating shafts of mechanical equipment, using a torsionally soft flexible element to accommodate inherent misalignment while transmitting the power and torque between the shafts.
2. These instructions are intended to help you install and maintain your Omega coupling. Please read these instructions prior to installing the coupling, and prior to maintenance of the coupling and connected equipment. Keep these instructions near the coupling installation and available for review by maintenance personnel.
3. Regal Rexnord Corporation owns the copyright of this material. These Installation and Maintenance instructions may not be reproduced in whole or in part for competitive purposes.

Safety and Advice Hints

DANGER

1. Safety should be a primary concern in all aspects of coupling installation, operation and maintenance.
2. All rotating power transmission products are potentially dangerous and can cause serious injury. They must be guarded in compliance with OSHA, ANSI, ATEX and any other local standard for the applications they are used. It is the responsibility of the user to provide proper guarding.
3. Failure to secure cap screws properly could cause coupling component(s) to dislodge during operation and result in personal injury. See Table 3 for proper tightening torques.
4. Do not use on turbine drives if the coupling cannot be protected from steam leakage or overspeed situations beyond the coupling’s published speed rating.
5. Before installing this coupling on systems involving sleeve bearings, herringbone gearsets or other axially sensitive devices, consult Regal Rexnord.
6. Elastomeric couplings can hold a static electric charge that may discharge and ignite in an explosive environment. Both shafts of the connected equipment must have a path to ground.

Preventative Maintenance

DANGER:  Do not make contact with the coupling when it is rotating and/or in operation.

1. Periodic visual inspection is necessary to evaluate the condition of the flex element. Inspection can be done during the operation using a strobe light.
2. When inspecting the element look for:
   • Fatigue cracks at element splits, discoloration and surface cracking in body of element.
   • CAUTION! Replace element if necessary.

Element Replacement

DANGER:  Stop the motor and lock it out to prevent start-up during installation of coupling.

1. Always replace both half elements.
2. Install both half elements from the same box.
3. Follow installation instructions (see Section 7, Rexnord Omega Coupling Installation).
4. Tighten element cap screws to proper torque (see Table 3).

The designation ATEX (Atmosphere Explosibles) has established itself for the new guidelines. ATEX 100a controls all regulations for the condition of explosion-proof equipment.

• Model No.___
• Category____
• Mfg Year____
• Reference___
• Max Temperature ____

Part Numbers

Rexnord® Omega® Coupling Design and Part Numbers

TABLE 1 — Omega (E & ES) Part Numbers

Size

| Elastomer Element| Hubs| Element Cap Screws 6| High Speed Rings

7

| ****

Sleeve Extension

---|---|---|---|---|---
E

Standard

1

| ES

Spacer

2

| Rough Bore (Std)

3

| Taper-Lock Hub

4

| QD Bushed Hub

5

| Carbon Steel

6

| Stainless Steel

6

| ****

Size (in)

| ****

Qty

2| 10287330| 10287346| 10287359| —| —| 10287681| 10287682| 1/4-20 x 3/8″| 8 + 8| —| —
3| 10287331| 10287347| 10287365| 10287464| —| 10314073| 10287684| 1/4-20 x 1/2″| 8 + 8| —| 10287525
4| 10287332| 10287348| 10287373| 10287465| 10287478| 10314073| 10287684| 1/4-20 x 1/2″| 8 + 8| —| 10287526
5| 10287333| 10287349| 10287386| 10287466| 10287479| 10314073| 10287684| 1/4-20 x 1/2″| 8 + 8| —| 10287527
10| 10287334| 10287350| 10287403| 10287467| 10287480| 10313938| 10287686| 1/4-20 x 1/2″| 12 + 12*| —| 10287528
15| 10287335| 10287351| 10287416| 10288104| 10287481| 10314939| 10287687| 5/16-18 x 1/2″| 12| —| 10287524
20| 10287336| 10287352| 10287418| 10287468| 10287482| 10316221| 10287689| 3/8-16 x 5/8″| 12| 10287498| 10287529
30| 10287337| 10287353| 10287427| 10287469| 10287483| 10316221| 10287689| 3/8-16 x 5/8″| 12| 10287499| 10287530
40| 10287338| 10287354| 10287437| 10287470| 10287484| 10315342| 10287691| 3/8-16 x 5/8″| 16| 10287500| 10287531
50| 10287339| 10287355| 10287447| 10287471| 10287485| 10315342| 10287691| 3/8-16 x 5/8″| 16| 10287501| 10287532
60| 10287340| 10287356| 10287454| 10287472| 10287486| 10313041| 10287693| 1/2-13 x 7/8″| 16| 10287502| 10287533
70| 10287341| 10287357| 10287459| 10287473| 10287487| 10313041| 10287693| 1/2-13 x 7/8″| 16| 10287503| 10287534
80| 10287342| 10287358| 10287460| 10287474| 10287488| 10313041| 10287693| 1/2-13 x 7/8″| 16| 10287504| 10287535
100| 10287343| —| 10287461| 10287475| 10287490| 10315236| 10287695| 3/4-10 x 1-1/2″| 20| —| 10287536
120| 10287344| —| 10287462| 10287476| 10287489| 10312654| 10287965| 3/4-10 x 1-1/2″| 24| —| 10287537
140| 10287345| —| 10287463| 10287477| 10287491| 10315315| 10287698| 1.0-8 x 1-1/2″| 32| —| 10287538

*Extra cap screws provided for spacer couplings with rings.

Drive Alignment

DANGER:  Stop the motor and lock it out to prevent start-up during installation of coupling.

STEP 1

• b (max) ___ in
• a (min) ___ in
• ΔKa = (b-a)
• ΔKa = ____

STEP 2

• ΔKr __ in

CAUTION

• Improper alignment of the equipment or hubs may result in hub contact and sparking.

STEP 3

• ΔKa — refer to Step 1
• ΔKr — refer to Step 2
• ΔKa max & ΔKr max — refer to Table 2

TABLE 2 — Maximum Misalignment (in)

Coupling Size (E & ES)| 2| 3| 4| 5| 10| 15| 20| 30| 40| 50| 60| 70| 80| 100| 120| 140
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
Angular| ΔKa max| 0.13| 0.16| 0.18| 0.22| 0.25| 0.25| 0.23| 0.28| 0.35| 0.42| 0.31| 0.32| 0.39| 0.37| 0.46| 0.55
Radial| ΔKr max| 0.06| 0.06| 0.06| 0.06| 0.06| 0.06| 0.09| 0.09| 0.09| 0.09| 0.13| 0.13| 0.13| 0.16| 0.16| 0.16

Rexnord® Omega® Coupling Installation

STEP 1

1. Clean dirt and burrs from shafts and hub bores.
2. Be sure the keys fit shafts properly.
3. Position both hubs on the shaft without tightening the set screws.
4. Use a half element to set proper hub spacing.
5. When the hubs are properly spaced, tighten the set screws.
6. When using tapered bushings, follow bushing manufacturer’s instructions.

STEP 2

1. Mount first half element to the hubs using cap screws provided.
2. Rotate the shaft 180 degrees and secure second half element.
3. If shaft cannot be rotated, mount half elements at 90 degrees.

STEP 3

1. Tighten all cap screws to the torques specified in Table 3.
2. Align equipment.
3. Install proper guarding prior to equipment start-up.

CAUTION:  When installing the element, first snug all the cap screws with a light torque, then tighten all cap screws to proper torque using a torque wrench.

**TABLE 3 — Cap Screw Torque***

Size

| ****

Qty

| Tightening Torque — Dry| Size (in)| Wrench Size
---|---|---|---|---
(lb-in)| (lb-ft)| N-m
2| 8 + 8| 204| 17| 23| 1/4-20 x 3/8″| **

7/16″

3| 8 + 8| 204| 17| 23| 1/4-20 x 1/2″
4| 8 + 8| 204| 17| 23| 1/4-20 x 1/2″
5| 8 + 8| 204| 17| 23| 1/4-20 x 1/2″
10| 12 + 12| 204| 17| 23| 1/4-20 x 1/2″
15| 12| 288| 24| 33| 5/16-18 x 1/2″| 1/2″
20| 12| 360| 30| 40| 3/8-16 x 5/8″| ****

9/16″

30| 12| 360| 30| 40| 3/8-16 x 5/8″
40| 16| 360| 30| 40| 3/8-16 x 5/8″
50| 16| 360| 30| 40| 3/8-16 x 5/8″
60| 16| 900| 75| 100| 1/2-13 x 7/8″| ****

3/4″

70| 16| 900| 75| 100| 1/2-13 x 7/8″
80| 16| 900| 75| 100| 1/2-13 x 7/8″
100| 20| 3,240| 270| 370| 3/4-10 x 1-1/2″| 1-1/8″
120| 24| 3,240| 270| 370| 3/4-10 x 1-1/2″
140| 32| 7,080| 590| 800| 1.0-8 x 1-1/2″| 1-1/2″

• Cap screws have self-locking patches which should not be lubricated or reused more than twice.
  **Extra cap screws provided for spacer couplings with rings.

Cap Screw Torque

1. Do not lubricate cap screw threads.
2. Cap screws must have a thread-locking adhesive applied.
3. Tighten cap screws by using torque wrench.

CAUTION:  Do not lubricate cap screw threads.

Mounting Options

Rexnord® Omega® Hub Mounting Options

• Hubs can be installed:
  • flush with the shaft end (D)
  • extended beyond the end of the shaft (E)
  • recessed behind the shaft end (F)

CAUTION:  Shaft engagement length should be >0.8 times shaft diameter, bushed hubs must engage 100%.

Rexnord Omega “Type E” Mounting Options

*TABLE 4 — Type E Mounting Options (in)**

Arrangement| 2| 3| 4| 5| 10| 15| 20| 30| 40| 50| 60| 70| 80| 100| 120| 140
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
A| 1.34| 0.81| 0.44| 0.81| 0.56| 0.56| 0.50| 0.56| 0.56| 0.63| 0.69| 0.75| 0.75| 1.75| 2.25| 3.0
B| 1.62| 1.06| 0.88| 1.31| 1.19| 1.19| 1.44| 1.50| 1.62| 2.01| 2.07| 2.25| 2.88| 2.75| 3.57| 4.0
C| 1.90| 1.31| 1.31| 1.81| 1.81| 1.81| 2.38| 2.44| 2.68| 3.38| 3.44| 3.75| 5.00| 3.75| 4.88| 5.0

*E (inch) hubs are different than EM (metric) hubs.

Rexnord Omega “Type ES” Mounting Options

TABLE 5 — Spacer Coupling Type ES (Metric) Hub Mounting Options

*Hub mounted inboard.

“Regal Rexnord” is not indicative of legal entity. Refer to product purchase documentation for the applicable legal entity.
Regal Rexnord, Rexnord and Omega are trademarks of Regal Rexnord Corporation or one of its affiliated companies.

© 2009, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23027E • Form# 80152E

Industrial Powertrain Solutions Regal Rexnord

• Application Engineering: 800 626 2093
• PTSAppEng@regalrexnord.com
• rexnord.com/Omega

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