| 摘要 |
<p>A multi-disc frictional engagement mechanism (1) includes a plurality of driven plates (2) and drive plates (3), a hydraulic piston (10), a spring (13) which comes into contact with a pressure receiving portion (10b) of the hydraulic piston (10), an oil chamber (20) which causes a hydraulic pressure to act on the pressure receiving portion (10b), and a lock mechanism (9) which restricts a movement of the hydraulic piston (10) in a coupling direction toward the driven plates (2) and the drive plates (3) in a state where the hydraulic pressure is supplied to the oil chamber (20), the spring (13) is compressed by the pressure receiving portion (10b) and the driven plates (2) and the drive plates (3) are not coupled.</p> |
