| 摘要 |
A multi-disc frictional engagement mechanism (1) includes driven plates (2) and drive plates (3), a clutch piston (12) including a radially extending first pressure receiving portion (12r), a joint piston (13) including a radially extending second pressure receiving portion (13r) and an engaging portion (13e) which is engaged with a clutch hub (4) to engage the clutch hub (4) and the clutch drum (5) such that the clutch hub (4) and the clutch drum (5) are not relatively rotatable when the joint piston (13) advances, a first oil chamber (21) which causes a hydraulic pressure to act on the first pressure receiving portion (12r), and a second oil chamber (22) which communicates with the first oil chamber (21) and to which the hydraulic pressure is supplied later than to the first oil chamber (21) to act on the second pressure receiving portion (13r) when the hydraulic pressure is supplied to the first oil chamber (21). |
