Patent ID: 6638469
Filing Date: 2003-10-28
Classification: F16D

Abstract:
A method of manufacturing a waved disk which is used as a disk for a friction engaging apparatus, said waved disk having a toothed portion along one of an outer edge and an inner edge of said waved disk, said waved disk being bent into a wave shape in a direction of a thickness of said waved disk with a circumferential direction being defined as a direction of a wave length, said method being carried out with a pressing apparatus comprising a stationary die and a movable die, said stationary die having a plurality of pressing portions radially provided in a manner raised from a surface of said stationary die so as to correspond to ridges of one of mountains and valleys of the wave shape, said movable die having a plurality of pressing portions radially provided in a manner raised from a surface of said movable die so as to correspond to ridges of the other of said mountains and valleys of the wave shape, said method comprising:pressing, between said stationary die and said movable die, a disk blank made up of an annular flat plate having a toothed portion along one of the outer edge and the inner edge to thereby form a wave disk by pressing, wherein said pressing is carried out in a state in which said toothed portion of said disk blank is positioned in such a phase as to be circumferentially away from each of said pressing portions of said stationary die and of said movable die.