Patent ID: 9133891
Filing Date: 2015-09-15
Classification: F16D

Abstract:
1. A friction clutch plate that is arranged to face a contact object so as to be relatively rotatable and relatively movable, comprising: a contact surface configured to be 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, wherein 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, wherein the minute groove is set such that the groove pitch of the plurality of groove portions falls within the range of 400 μm to 600 μm, and wherein each of the groove portions has a shape in cross section perpendicular to an extending direction of the groove portions whose width becomes smaller toward a bottom of the groove, such that the μ-v gradient with respect to an area ratio of the sliding surface has a non-negative value.