| 摘要 |
Provided is a clutch plate capable of decreasing a dragging torque. A clutch plate in the present invention is 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 the axial direction and in which the end surface has the lubrication grooves and a friction engaging surface. The groove is provided with a groove forming portion that extends in a direction crossing the circumferential direction and that takes a U shape in a section orthogonal to the 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. Where a straight line passing across one side end of the groove and extending in a radial direction is assumed as a virtual straight line, in a section of the groove taken along a plane that is orthogonal to the virtual straight line and that includes the one side end, the 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. |
