Patent ID: 8967340
Filing Date: 2015-03-03
Classification: F16D

Abstract:
1. A flat, annular plate element which is supported through meshing engagement with a concave holder-side engagement portion formed on an inner peripheral surface of a tubular holder, and which is pressed against or separated from a flat, annular counterpart element while being rotated relative to the counterpart element, the plate element comprising: a flat, annular pressing element having an annular pressing portion which is pressed against the counterpart element for frictional contact therewith; a convex plate-side engagement portion which is provided on an outer peripheral surface of the pressing element facing the holder-side engagement portion of the holder and which is in meshing engagement with the holder-side engagement portion; and a projecting portion integrally formed on an outer peripheral surface of the plate-side engagement portion radially opposing the inner peripheral surface of the holder.