Patent ID: 7823714
Filing Date: 2010-11-02
Classification: F16D

Abstract:
1. 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 bonded at angular intervals on the corresponding one of said opposite sides, said 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: said second oil groove includes a protuberance that is located at a radially-outer portion of the second oil groove, and the second oil groove narrows from a radially-inner most portion of the protuberance toward the closed end portion of the second oil groove.