Coupling Specs: gear
Mechanical shaft coupling specifications for rotating equipment design. Covers 9 coupling types (jaw/spider, gear, disc/diaphragm, grid, Oldham, bellows, fluid, universal joint, rigid flange) in small/medium/large/extra-large size classes. Includes bore range, maximum torque, maximum speed, angular/parallel/axial misalignment limits, torsional stiffness, damping capability, service temperature range, maintenance requirements, typical applications, advantages, and limitations. Data from Rexnord Falk, Lovejoy/Timken, Thomas, Voith, Spicer/Dana catalogs and Shigley's handbook.
| coupling type | size class | advantages | bore range max in (in) | bore range min in (in) | damping capability | limitations | maintenance required | max angular misalignment deg (deg) | max axial misalignment in (in) | max parallel misalignment in (in) | max speed rpm (RPM) | max torque ft lb (ft-lb) | service temp max F (degF) | service temp min F (degF) | torsional stiffness ft lb per rad (ft-lb/rad) | typical applications |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| gear | extra_large | Maximum torque density; handles shock loads; proven for extreme HP | 24 | 6 | none | Precision lubrication system required; coupling housing seals; high cost | yes | 1.5 | 0.375 | 0.04 | 1,800 | 500,000 | 300 | -20 | 12,000,000 | Mine hoists, steel mill main drives, large turbine trains >10000 HP |
| gear | large | Highest torque density of any flexible coupling; proven in harsh environments | 14 | 3 | none | Requires precision alignment during installation; lubrication maintenance | yes | 1.5 | 0.25 | 0.03 | 3,600 | 120,000 | 300 | -20 | 3,000,000 | Gas/steam turbines, rolling mill drives, large compressors >5000 HP |
| gear | medium | Handles high shock and peak torque; high misalignment capability; long service life | 5 | 1.5 | none | Lubrication failure = rapid wear; not suited for continuous misalignment | yes | 1.5 | 0.188 | 0.02 | 6,000 | 12,000 | 300 | -20 | 450,000 | Industrial drives, rolling mills, turbine-generator sets up to 2000 HP |
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