Coupling Specs: fluid
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| fluid | large | Controlled starting; torque limiting; absorbs torsional vibrations | 14 | 5 | high | High mass; maintenance-intensive; no precise speed synchronization | no | 0.5 | 0.375 | 0.1 | 1,800 | 25,000 | 200 | 20 | 1,500 | Large induced-draft fans, mine conveyors, ball mill drives, heavy industry |
| fluid | medium | Smooth acceleration; slip at overload prevents motor damage; simple | 7 | 2.5 | high | Oil fill/drain maintenance; power loss at slip; speed difference between halves | no | 0.5 | 0.3 | 0.075 | 3,600 | 4,000 | 200 | 20 | 400 | Large conveyors, ball mills, pumps, fans, steel mill drives |
| fluid | small | Cushions start-up shock; automatic overload protection; no mechanical connection | 3.5 | 1 | high | Operating temperature range limited; oil seal maintenance; not for reversing drives | no | 0.5 | 0.2 | 0.05 | 5,000 | 400 | 200 | 20 | 100 | Motor soft starts, conveyors, crushers, fans — torque-limiting |
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