Patent ID: 9188168
Filing Date: 2015-11-17
Classification: F16D

Abstract:
1. A clutch plate being an annular shape and a wet type in which lubrication grooves comprising a plurality of grooves are formed on at least one of both end surfaces in an axial direction and in which the end surface has the lubrication grooves and a friction engaging surface; wherein the groove is provided with a groove forming portion that extends in a direction crossing a circumferential direction and that takes a U shape in a section orthogonal to an extending direction, and blunt portions that extend along the extending direction of the groove forming portion on both sides of the groove forming portion and that connect the friction engaging surface with the groove forming portion; wherein the blunt portion is widened as it goes from a bottom of the groove toward an opening in a section orthogonal to the extending direction; and wherein, where a virtual straight line is taken as a straight line passing across one side end of the groove and extending in a radial direction, in a section of the groove having the one side end taken along a plane that is orthogonal to the virtual straight line and that includes the one side end, a width of the blunt portion on one side is in a range of 0.12 to 0.35 mm, and the depth of the blunt portion is in a range of 25 to 50 μm.