Compact electromagnetic tooth clutch

摘要

A compact electromagnetic clutch has a toothed armature connected to a driven hub and a toothed driving hub which are moved into engagement with each other upon energization of an electromagnet. A precompressed spring disposed between the bottom of a cylindrical cup attached to the armature and the head of a pin attached to the driven hub biases the armature away from the driving hub. The precompressed spring provides a force strong enough to overcome residual magnetism. The spring is further compressed when the armature moves into engagement with the driving hub upon energization of the electromagnet. After de-energization of the electromagnet, the precompressed spring biases the armature away from the driving hub disengaging the armature teeth from the teeth of the driving hub. The electromagnet is provided with a shaped coil and a conventional ball bearing rotatably supports the driving hub to form an economical compact clutch.