Patent ID: 7455161

Claim:
A clutch for an automatic transmission, comprising: a first friction member supporting member connected to and axially slidable along an inner circumference of a clutch retainer connected to a transmission input shaft; a second friction member supporting member connected to and axially slidable along an outer circumference of a hub acting as an output member; a piston disposed within the clutch retainer, movable by hydraulic pressure to thereby move the first and second friction member supporting members into contact with each other, such that friction is generated between the first and second friction member supporting members; at least one first protrusion on the first friction member supporting member and at least one second protrusion on the second friction member supporting member, wherein the protrusions protrude in a direction substantially perpendicular to a radial direction of the friction member supporting members, wherein the second protrusion overlaps with an inner circumference portion of the first protrusion; and a friction member disposed on each of the protrusions on a surface of the protrusion that faces the other protrusion.