Patent ID: 8579097

Claim:
A clutch release mechanism comprising: a fixed cam plate held by a case member which covers a multiple disk clutch device, the fixed cam plate comprising a cylindrical boss portion disposed adjacent to, and coaxial with a main shaft of a transmission, the cylindrical boss portion rotatably supporting a movable cam plate thereon so as to be turnable coaxially with the main shaft; the movable cam plate formed with a cylindrical projecting portion which is rotatably and axially slidably supported relative to the fixed cam plate by inserting the cylindrical boss portion through a hollow bore formed in the cylindrical projecting portion, the movable cam plate capable of being turned through engagement with a clutch arm of the transmission; a ball unit housed between the fixed cam plate and the movable cam plate, the ball unit comprising a retainer member supported on the fixed cam plate which retains the ball unit thereon; a release member configured and arranged for selective disengagement of the multiple disk clutch device by transmitting, to a pressure-applying plate, a thrust force generated by relative turning of the fixed cam plate and the movable cam plate which hold the ball unit therebetween; and a pressing member fitted to the release member via a bearing, and configured to be pressed by the movable cam plate to receive the thrust force and transmit the thrust force to the release member via the bearing; wherein the pressing member has a hollow portion formed therethrough and extending in the main shaft direction, wherein the movable cam plate is formed to allow the cylindrical projecting portion thereof to project toward the pressing member, and wherein the cylindrical projecting portion of the movable cam plate fits into the hollow portion of the pressing member with a gap defined therebetween, and is operable to press the pressing member so as to be relatively shiftable on a flat surface perpendicular to a pressing direction.