Patent ID: 8875859

Claim:
A hydraulic clutch comprising: a clutch piston; a plurality of clutch plates; a clutch drum that includes at least: an outer cylinder portion, an inner cylinder portion that axially extends at a radial inner side of the outer cylinder portion, and a side wall portion that radially connects the outer cylinder portion and the inner cylinder portion, wherein the clutch piston defines together with the clutch drum an engagement side oil chamber, and the clutch piston moves in an axial direction so as to press the plurality of clutch plates by hydraulic pressure supplied to the engagement side oil chamber; and a cancel plate that defines together with the clutch piston a cancel oil chamber that cancels centrifugal hydraulic pressure, wherein: a first oil passage that is in communication with the engagement side oil chamber and a second oil passage that is in communication with the cancel oil chamber are formed so as to radially extend within the side wall portion, and one of the first and second oil passages is at least partially included in a range of an axial width of the other of the first and second oil passages within the side wall portion.