SHIFTABLE FRICTION CLUTCH

摘要

Friction clutch means including interleaved compressible friction plates and selectively operable means effecting compression thereof. One aspect of the invention relates to the means utilizing torque generated between the parts to be clutched for providing the compression force to be applied to the plates. Ball and ramp means are provided between driving and driven parts responding to torque initially applied to the driving member for generating an axial force which is then applied to the plate compressing means. Torque limiting means are provided in the force train to prevent transmission of excessive torques. Positive means are provided for preventing relative movement of the pressure generating parts when the clutch is in the disengaged condition whereby to insure against a tendency for a residual compression force to be applied during idling conditions.