Aisin Seiki Kabushiki Kaisha

Aisin Seiki Company, Ltd.

Aisin Kako Kabushiki Kaisha

Hisami Tsujio

Nobuyasu Ishida

Toshiaki Sakabe

Yasuhiro Matsumoto

A friction material particularly useful as a clutch facing is prepared by (a) impregnating a fiber base material with a binder, said fiber being other than asbestos fiber and being stable to heat without reduction in weight and in volume in an atmosphere at 300.degree. C.; (b) shaping the impregnated fiber into the predetermined shape of a crude friction material; (c) inserting said shaped material into the cavity of a mold which has been heated to a predetermined temperature; (d) pressure/heat treating said shaped material by compressing the crude friction material for 2 to 10 seconds at a predetermined pressure and at a predetermined temperature in a closed mold and degassing the compressed friction material for 0.5 to 2 seconds in an open mold, and repeating the cycle of step (d) 10 to 20 times.

Method for making friction material without asbestos fibers including

A clutch facing includes an annular reinforcing plate made of metal material, a friction lining bonded on the outer side of the annular reinforcing plate, and another lining bonded on the inner side of the annular reinforcing plate. The annular reinforcing plate is secured to a clutch driven plate assembly by a plurality of rivets. The head portions of the rivets are entirely received in the extruded pocket portions of the annular reinforcing plate, so that the clutch facing will be useful until the friction lining is worn off. Another lining is made of suitable material having a lower comparative cost than the friction lining. An additional lining prevents the annular reinforcing plate from corrosion and prevents the friction lining from experiencing a pressure difference on the friction surface of the friction lining.

Clutch facing

A clutch disc assembly including a pair of annular friction facings in the form of a truncated-conical shape adapted to be frictionally gripped and flattened between a flywheel and a pressure plate in the engage state, the friction facings being made of a composite material consisting essentially of asbestos fiber and thermoset resin and being arranged to be contiguous to the side-face of the flywheel at their inner peripheries and spaced apart from the flywheel at their outer peripheries in the disengaged state, the hardness of the inner periphery of the facing opposed to the flywheel being greater than that of its remaining portion, and the hardness of the outer periphery of the facing opposed to the pressure plate being greater than that of its remaining portion.

Growing community of inventors

Okazaki, Japan

Hisami Tsujio