Viva Elastomeric Couplings

Configurations and Naming

Type V (Close Coupled) Ratings - Straight Bored Hubs

Metric values converted from the Rexnord Viva catalogue (imperial data: in-lb, inch); maximum bores for keyways per AGMA 9112 (metric) / AGMA 9002 (inch). Taper-Lock and QD hub versions, spacer VS and extended spacer VSX have their own bore, length and shaft-gap tables. Source: Rexnord Viva Elastomeric Couplings MCC-11975-RE-EN-US; dimensions subject to change - certified dimensions on request.

Selection Procedure - Manufacturer Catalogue Method

1. Identify the machine, driver, driven load and duty.

2. Select V, VS or VSX for shaft gap and maintenance access.

3. Calculate operating torque: T (N·m) = 9,549 × P (kW) / n (rpm).

4. Obtain the manufacturer-specific service factor (SF) and any temperature or driver corrections.

5. Calculate T_eq = T × SF and choose a catalogue torque rating above T_eq.

6. Verify maximum rpm, shaft bores, hub attachment, shaft gap, allowable misalignment and thermal environment.

7. Review torsional / lateral dynamics for sensitive or critical systems.

Illustrative Service-Factor References (Viva catalogue)

Viva manufacturer values, not universal factors. Engine drives, temperatures above 60°C and special loads may require additional adjustment and engineering review.

Published Data and Operating Cautions

Viva catalogue size-specific torque, speed, bore, weight and shaft-gap tables vary by V / VS / VSX and hub arrangement. The manufacturer cautions that axial-sensitive equipment may require additional limits; coupling selection alone does not establish system torsional / lateral stability. The manufacturer describes ANSI/AGMA 9000 Class 8 standard balance for factory-matched half elements; high-speed duties require application-specific confirmation.

Replacement / Interchange Checklist

Never approve a replacement from size or visual similarity alone. Compare transmitted and peak torque; motor / driver type; maximum rpm; hub bores and keyways; shaft engagement; DBSE and total length; allowable combined misalignment; axial forces; torsional stiffness and damping; inertia and balance; temperature and chemicals; maintenance accessibility; fastener hardware; machine guarding; and any project standards.

Industrial Applications

Pumps, centrifugal fans, blowers, compressors, conveyors, bucket elevators, mixers, crushers, mineral processing, cement production, steel production, paper processing and general OEM drives. Final suitability depends on each duty cycle, motor characteristics and manufacturer limits.

What to Send for a Technical RFQ

Existing brand / series / size and photos; machine and industry; motor power (kW / hp), nominal and maximum rpm; driven load and operating cycle; start-up frequency and peak / reversing torque; both shaft diameters and keyways; distance between shaft ends (DBSE); current hub arrangement; ambient temperature / chemical exposure; available space; alignment and axial movement; required certification; quantity and delivery location.

Technical source: Regal Rexnord, Rexnord Viva Elastomeric Couplings, Imperial, MCC-11975-RE-EN-US, pp. 4-7 and configuration / engineering tables. Brand names identify original manufacturer products and engineering reference families; no manufacturer authorisation or agency is implied. Verify current manufacturer data.