| 摘要 |
An actuator for a power transmitting friction clutch having a rotatable power input originating in a flywheel (10), a pressure plate (14) rotatable with the power input, and an output connected friction disc assembly (16) between the pressure plate and the flywheel. The actuator comprises a diaphragm (22) having an outer annulus (21) defining a negative Belleville spring (21) and a plurality of radial control fingers (25) extending inwardly from the outer annulus, the outer annulus having an outer periphery engageable with the pressure plate and an inner fulcrum edge, and a reaction means opposing force exerted by the negative Belleville spring on the pressure plate. The reaction means consists essentially of positive spring means (30) connected to the flywheel and supporting the inner fulcrum edge of the outer annulus of the diaphragm so that absolute values of force between the negative Belleville spring and the pressure plate and force exerted between the negative Belleville spring and the positive spring means remain substantially equal during actuation of the clutch. Compensating springs (26) are provided for shifting the range of deflection of at least one of the negative Belleville spring and the positive spring as the thickness of the friction disc assembly is reduced by wear. |
