| 摘要 |
A spring operated clutch in which the clutching members are urged into engagement by spring sets and drawn out of engagement by an electromagnetic coil acting on an armature member, to provide a fail safe design for automotive fan drive applications. The clutch incorporates a wear compensation arrangement which allows for wearing of the clutching surfaces while maintaining a constant air gap between the armature and the inner body. The arrangement includes a threaded connection between an outer body comprising one of the clutching members and the armature, with the outer body axially advanced on the armature after a wearing of the surfaces reduces the torque output of the clutch, the axial advance being created by an engagement of the armature with a stop surface on the output clutching member. The clutch operating springs consist of two sets of springs, one set acting on the outer body to preload the threaded connection, retarding relative movement between the outer body and armature to preclude inadvertent axial adjustments.
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