Pearne, Gordon, McCoy & Granger
Frictional engagement apparatus
 A frictional engagement apparatus which is small in size, high in torque, and long in endurance life and includes driven and driving plates. A frictional material is provided on one surface of each of the driven and driving plates, while a ceramic thin film composed of IV.sub.B, V.sub.B, or VI.sub.B family elements, such as titanium, in the periodic table of elements, Si, Al, and carbides, nitrides and oxides thereof, is formed on the other surface. The ceramic thin film includes a ceramic thin film intermediate layer formed on a surface of the respective plate, and a ceramic thin film layer formed on the intermediate layer. 
NSK - Waner Kabushiki Kaisha
F F F F F
F16D F16D F16D F16D F16D
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Tatsuro Shigeki
Miyoshi Umezawa