Aluminium Motor Couplings, For Disc Coupling, Size: 1 inch

Product Details

The rich variety of available flexible couplings provides a wide range of performance tradeoffs. When selecting among them, resist the temptation to overstate service factors. Coupling service factors are intended to compensate for the variation of torque loads typical of different driven systems and to provide for reasonable service life of the coupling. If chosen too conservatively, they can misguide selection, raise coupling costs to unnecessary levels, and even invite damage elsewhere in the system. Remember that properly selected couplings usually should break before something more expensive does if the system is overloaded, improperly operated, or somehow drifts out of spec. Determining the right type of flexible coupling starts with profiling the application as follows: • Prime mover type - electric motor, diesel engine, other • Real torque requirements of the driven side of the system, rather than the rated horsepower of the prime mover – note the range of variable torque resulting from cyclical or erratic loading, "worst-case" startup loading, and the amount of start-stop reversing activity common during normal operation • Vibration, both linear and torsional • Shaft sizes, keyway sizes, and the desired fit between shaft and bore • Shaft-to-shaft misalignment - note degree of angular offset (where shafts are not parallel) and amount of parallel offset (distance between shaft centers if the shafts are parallel but not axially aligned); also note whether driving and driven units are or could be sharing the same base-plate • Axial (in/out) shaft movement, BE distance (between ends of driving and driven shafts), and any other space-related limitations.   Application specifics Initially, flexible couplings divide into two primary groups, metallic and elastomeric. Metallic types use loosely fitted parts that roll or slide against each other or, alternatively, non-moving parts that bend to take up misalignment. Elastomeric types, on the other hand, gain flexibility from resilient, non-moving, rubber or plastic elements transmitting torque between metallic hubs.   Metallic types are best suited to applications that require or permit: • Torsional stiffness, meaning very little "twist" occurs between hubs, in some cases providing positive displacement of the driven shaft for each incremental movement of the driving shaft • Operation in relatively high ambient temperatures and/or presence of certain oils or chemicals • Electric motor drive, as metallic generally are not recommended for gas/diesel engine drive • Relatively constant, low-inertia loads (metallic couplings are generally not recommended for driving reciprocal pumps, compressors, and other pulsating machinery) Elastomeric types are best suited to applications that require or permit: Torsional softness (allows "twist" between hubs so it absorbs shock and vibration and can better tolerate engine drive and pulsating or relatively high-inertia loads) Greater radial softness (allows more angular misalignment between shafts, puts less reactionary or side load on bearings and bushings) Lighter weight/lower cost, in terms of torque capacity relative to maximum bore capacity Quieter operation