Abstract: In a pull type clutch cover assembly, a disc-like annular conned disc spring 8 is installed in such a manner that an inner peripheral edge of the conned disc spring is moved together with the diaphragm spring 5 toward a pressure plate side in axial direction, when the clutch is engaged, so as to urge the diaphragm spring in an axial direction opposite to the pressure plate. Therefore, an excessive increase in a load of the diaphragm spring 5 can be controlled during operation of clutch.

Abstract: Disclosed is a release bearing of clutch which comprises a case unit supported on a quill fixed on a housing, a bearing main body incorporated into the case unit, and a sleeve having the case unit slidably supported on the outer circumference of the quill, wherein a bush made of a softer material than the sleeve is interdisposed between the inside of the sleeve and the outside of the quill being fixed detachably on the sleeve.

Abstract: A lock-up device for a torque converter, in which a piston actuated by hydraulic force and a lock-up damper are disposed between a front cover and a turbine wheel of the torque converter, a pressing force of the piston causes both friction surfaces of a friction plate of the lock-up damper to press on a friction plate of the front cover, and plural hydraulic chambers are provided by forming a pressure surface of the piston into a multiple-stage structure. A hydraulic chamber located at the most inner peripheral side is connected to a passage of hydraulic oil. The plural hydraulic chambers are connected with each other through fine clearances. A pressure area of the piston in the most inner peripheral side hydraulic chamber is set to a size which does not permit the piston to press on the front cover side friction plate under a state where the hydraulic oil is filled only in the most inner hydraulic chamber.