Patent ID: 8162123

Claim:
A friction plate for a wet-type multiplate clutch, said friction plate being provided with a core plate and friction linings bonded on opposite sides of said core plate, respectively, each of said friction linings being composed of plural segment pieces each having at least one first oil groove and at least one second oil groove, said first oil groove opening to a radially-inner side of its corresponding segment piece and having a closed end portion located in a radially-intermediate part of the corresponding segment piece, and said second oil groove opening to a radially-outer side of the corresponding segment piece and having a closed end portion located in another radially-intermediate part of the corresponding segment piece, wherein: each segment piece is provided with at least one press-formed oil groove as one of said first and second oil grooves and at least one punched-out oil groove as the other one of said first and second oil grooves, wherein the at least one press-formed oil groove extends to at least one of an outer most radial edge of the segment piece and an inner most radial edge of the segment piece, and each segment piece is symmetrical with respect to a radial center line of the friction plate.