Patent ID: 9534639
Date: 2017-01-03
CPC Classifications: F16D

Claim:
1. A multi-plate friction clutch comprising: a clutch outer having a bottomed cylindrical shape wherein an outer cylindrical part extends along an axial direction from an outer circumferential edge of an outer bottom wall part whose center is journaled by a rotation shaft with intermediary of a bearing; a clutch center in which a center cylindrical part is formed inside the outer cylindrical part and extends toward an opposite side to the outer bottom wall part from a center bottom wall part whose center is journaled by the rotation shaft with restriction of relative rotation, the center bottom wall part being opposed to an inner surface of the outer bottom wall part and having a plurality of communication holes formed at an equal distance from an axial center; a plurality of friction plates engaging with the outer cylindrical part and a plurality of clutch plates engaging with the center cylindrical part that are alternately overlapped with each other in the axial direction in a ring-shaped space between the outer cylindrical part and the center cylindrical part; and a pressure plate sandwiching the friction plates and the clutch plates alternately overlapped with each other with the center bottom wall part for pressing the friction plates and the clutch plates by a biasing force of a clutch spring; the multi-plate friction clutch comprising: a center ring protrusion protruding into a cylindrical shape from an outer surface of the center bottom wall part is formed at substantially the same radial position as the plurality of communication holes; a ring recess opened toward the axial center is formed in an inner circumferential surface of the center ring protrusion; and said communication holes are opened so as to face the ring recess, wherein an outer ring protrusion protruding into a cylindrical shape from the inner surface of the outer bottom wall part is formed radially inside, relative to the center ring protrusion; and the outer ring protrusion protrudes to an axial position of the ring recess; and wherein an oil thrower groove is formed into a ring shape in an outer circumferential surface of the outer ring protrusion.