Invention Grant
US09133891B2 Friction clutch plate, friction clutch and driving force transmission apparatus 有权
摩擦离合器片,摩擦离合器和驱动力传递装置

Friction clutch plate, friction clutch and driving force transmission apparatus
Abstract:
A clutch plate arranged to face a contact object so as to be relatively rotatable and relatively movable includes a contact surface being able to contact the contact object via lubricant and a minute groove open at the contact surface and formed of a plurality of groove portions having a predetermined groove pitch. A ratio of a contact area of the contact surface to an area obtained by adding an opening area of the minute groove to the contact area of the contact surface is 90% to 96% in an initial state.
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