Jaw Couplings
Jaw couplings are a type of compression coupling that control motion by transmitting torque and dampening vibrations that could cause damage to other system components. They are used in motors of pumps, gear boxes, compressors, blowers, mixers and conveyers for industrial manufacturing applications. They are composed of a polyurethane-based elastomeric part that joins 2 hubs made of sintered metal, aluminum, standard steel, stainless steel, bronze or iron. These 3 parts are press fitted together with a jaw from each hub fitting into the elastomeric element's grooves. Jaw couplings are resistant to oil, dirt, grease, sand and moisture and do not require any lubrication.
The elastomeric element is often referred to as a spider because of its shape-circular with an even number of legs jutting out. It serves to dampen impulse loads and minimize shock to a motor. The polyurethane used can be either soft, which provides better vibration dampening, or hard, which gives the spider more strength. The hubs have curved jaws that interlock and reduce deformation of the spider which prevents backlash. These couplings are considered fail safe because if the spider malfunctions, the jaws of the 2 hubs interlock and create direct power transmission so the vehicle can shut down safely. Jaw couplings perform the best for applications that use a stop-and-go type of movement.