| 摘要 |
An automatic transmission (11) includes a bicylindrical member (50) in which an inner cylinder portion (50a) and an outer cylinder portion (50c) are integratedly formed through a flange portion (50b), and which forms a portion of a clutch drum of a third clutch (C3). The inner cylinder portion (50a) structures a first base portion in which a piston (43) of a fourth clutch (C4) slides, and the outer cylinder portion (50c) structures a second base portion in which a piston (33) of the third clutch (C3) slides. An end portion (50d) of the outer cylinder portion (50c) is provided extending so as to run through a clutch drum (42) of the fourth clutch (C4), and the clutch drum (42) is restricted from detaching by a snap ring (51). The clutch drum (42) also contacts and supports a cancel plate (34), and is supported by the outer cylinder portion (50c). The clutch drum (42) is thus supported more toward an outer perimeter side, and even if the clutch drum (42) is subject to a centrifugal hydraulic pressure of a cancel oil chamber (37), deformation can be suppressed. |
