| 摘要 |
PURPOSE:To generate large trim up force without spoiling an impact absorbing property by means of a small device by constituting a cylinder device supported with a hull or a marine pusher out of two cylinders having up chambers and down chambers partitioned by pistons. CONSTITUTION:A cylinder device 11 supported with a hull or an outboard engine, is provided with a first hydraulic cylinder 31 in which a first up chamber 40A, a first down chamber 40B, and a first sub-down chamber 40C are defined by a first piston 32, and a second hydraulic cylinder 33 in which it is provided capably of being projected from the cylinder 31, a second up chamber 42A and a second down chamber 42B are defined by adjacently receiving a second piston 34 and a cushioning piston 35. A piston rod 36 fixed to the cushioning piston 35 is supported with the outboard engine or the hull. The cushioning piston 35 is provided with a cushioning valve 50, and the respective up chambers 40A, 42A and the respective down chambers 40B, 42B are alternatively connected to a feed pump 13 by means of a working oil changeover device 12. |
