| 摘要 |
An actuator for a power transmitting friction clutch having a rotatable power input, a backplate rotatable with the power input, a pressure plate between the power input and the backplate, and an output connected friction cushion between the pressure plate and the power input. The actuator includes a diaphragm having an outer annulus defining a negative Belleville spring, and a plurality of radial control fingers extending inwardly from the outer annulus, the outer annulus having an outer periphery engageable with the pressure plate and an inner fulcrum edge. A positive spring unit is arranged in series with the negative Belleville spring between the inner fulcrum edge and the backplate. The diaphragm and the positive spring unit are supported in radial alignment on the backplate in a manner to provide unobstructed movement of the inner fulcrum edge of the diaphragm to load and unload the positive spring unit during actuation of the clutch. |
