Patent ID: 8794412

Claim:
A hydraulic clutch comprising: a clutch drum that includes at least: an outer cylinder portion that is fitted with a plurality of clutch plates and axially extends, 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; a clutch piston that defines together with the clutch drum an engagement side oil chamber, and moves in an axial direction so as to press the 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: the side wall portion of the clutch drum is formed with a first oil passage that radially extends and is in communication with the engagement side oil chamber, and a second oil passage that radially extends and is in communication with the cancel oil chamber, 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 in the side wall portion.