| 摘要 |
A clutch drum 400 of a clutch C4 includes an outer cylinder portion 401 that extends in an axial direction, an inner cylinder portion 403 that extends in the axial direction inside the outer cylinder portion 401 and movably supports a piston 405, and an annular wall portion 402 that is integrally formed with the outer cylinder portion 401 and the inner cylinder portion 403 so as to extend in the radial direction between the outer cylinder portion 401 and the inner cylinder portion 403. A cancel oil chamber defining portion 410 defining a centrifugal hydraulic pressure cancel chamber 308 for canceling centrifugal hydraulic pressure produced in an engagement oil chamber 306 of a clutch C3 is integrally formed with the clutch drum 400 so as to extend outward from an outer circumferential surface of the outer cylinder portion 401. An end surface 410z of the cancel oil chamber defining portion 410 is located closer to an open end side of the clutch drum 400 than an end surface 402z of an outer wall portion 402a of the annular wall portion 402. |
