Patent ID: 6397997
Filing Date: 2002-06-04
Classification: F16D

Abstract:
A friction engaging device comprising:externally toothed discs each having outer circumferential teeth adapted to be spline engaged with an outer member and; internally toothed discs each having inner circumferential teeth adapted to be spline engaged with an inner member; and friction materials through which said externally toothed discs and said internally toothed discs are brought into axial press contact with each other for performing the transfer of a torque between said outer member and said inner member, wherein one side face of each of said externally toothed discs in an axial direction is formed into a stepped surface having a raised surface portion on a radially outer side of said disc and a recessed surface portion on a radially inner side thereof by making a radially inner half portion of each of said externally toothed discs thinner than a radially outer half portion thereof, wherein an other side face of each of said internally toothed discs in an axial direction which is located contiguously to said one side of each of said externally toothed discs in the axial direction is formed into a stepped surface having a raised surface portion on a radially inner side of said disc and a recessed surface portion on a radially outer side thereof by making a radially outer half portion of each of said internally toothed discs thinner than a radially inner side half portion thereof, wherein first friction material of said friction materials being interposed between said externally toothed discs and said internally toothed discs that are located contiguously to said one side of said externally toothed discs in the axial direction are each divided into a radially outer half portion and a radially inner half portion, said radially inner half portion of said first friction material being attached to said recessed surface portion on said one side of each of said externally toothed discs in the axial direction or said raised surface portion on the other side of each of said internally toothed discs in the axial direction, said radially outer half portion of said first friction material being attached to said recessed surface portion on the other side of each of said internally toothed discs in the axial direction or said raised surface portion on said one side of each of said externally toothed discs in the axial direction.