FRICTION MEMBER, CLUTCH PLATE, CLUTCH DEVICE, AND TORQUE CONVERTER

摘要

In order to reduce the flow rate of leakage in a lock-up clutch device, ensure the sufficient lubrication and cooling of a friction member used for the lock-up clutch device, and reduce drag torque, the friction member is provided with friction sections (51) and grooves (52). The friction sections (51) are arranged in the circumferential direction and form annular friction surfaces. The grooves (52) are formed between the friction sections (51) and penetrate through the friction member from the inner peripheral side to the outer peripheral side. Each of the grooves (52) has an inner peripheral groove (54) and an outer peripheral groove (55). The inner peripheral groove (54) comprises: a first groove (57) which is on the inner peripheral side and which has an opening at the inner peripheral end; and a second groove (58) which is on the outer peripheral side and which continues to the first groove (57). The inner peripheral groove (54) is formed in a V-shape open in the circumferential direction. The outer peripheral groove (55) continues to the outer peripheral end of the second groove (58) of the inner peripheral groove (54) and extends radially toward the outer periphery.