Pressure plates for diaphragm spring clutches.

摘要

A pressure plate for use in a diaphragm spring friction clutch comprises an annular casting having the usual axially directed machined friction face (11) for engagement with a driven plate (not shown). The opposed face of the pressure plate has, as usual, a raised annular rib (12) against which in use a diaphragm spring (not shown) engages to apply a clamp load to the pressure plate. In accordance with the present invention the raised rib is used in the as-cast condition instead of being machined.