Pole friction clutch with annular gap between pole ring and collar

摘要

The rotor (2) has a coaxial collar (7) projecting beyond the outer rim (9) of the pole ring (5), leaving an annular air gap with a thickness less than the max. radial thermal expansion of the ring.The diaphragm (6) fixed to the hub (4) of the armature disc (3) is radially deformable by at least the same amt. In an alternative embodiment the collar is in the form of a ring which can be unscrewed from the motor.