Patent ID: 7832539

Claim:
A multiple disc clutch apparatus in which driven plates and drive plates are arranged alternately to overlap each other with frictional members interposed therebetween, and which is arranged to be engaged or released in response to an action mode or a non-action mode switched over by the pressing force of a piston, comprising: piston regulation means for regulating an amount of movement of the piston so that metallic plates forming substrates of the driven plates and the drive plates do not adhere to each other during engagement of the clutch apparatus in the event of a loss of frictional members; and a canceller disposed between an inner periphery of a radially outer end of the piston and the inner diameter part, wherein the piston regulation means includes a snap ring provided in an inner diameter part along a path of a sliding portion of said piston and the snap ring is disposed axially between a radially inner end of the piston and a radially inner end of the canceller.