Flexible shaft coupling

摘要

A flexible shaft coupling has first and second hubs provided with outwardly extending flanges formed at ends of cylindrical parts of the hubs. Each may be connected to a transmission shaft. The flange of the first hub has a plurality of spring holes therein located within the periphery thereof. A holder is fitted over the cylindrical part of the first hub and fixed to the flange of the second hub so as to hold the flange of the first hub between the holder and the flange of the second hub. Barrel-shaped coil springs pass through the spring holes in the flange of the first hub. Each barrel-shaped coil spring is compressed between the second hub and the holder so that the coil springs deflect to bring adjoining coils thereof into contact with each other when torque is transmitted. The largest-diameter portion of the barrel-shaped coil spring is fitted tight in the spring hole in the first hub, and the smallest-diameter portion thereof is fitted tight over a pin held between the flange of the second hub and the holder. A space sufficient for accommodating shaft misalignments is provided between the flange of the first hub and each of the second hub and the holder. An annular cover could also be employed in place of the second hub.