| 摘要 |
PURPOSE: To receive quickly surely a piston rod of a trim cylinder device in a tilt lock time by branching a relief flow path provided with a throttle means from between a pump and controlling valve in a tilt upper chamber side flow path to afford communication between the upper chamber of the trim cylinder and the downstream side of the throttle means. CONSTITUTION: In a tilt.trim down operation, a ejection pressure in a gear pump 34 acts through tilt upper chamber side flow paths 42, 45 on an upper chamber 28B of a tilt cylinder 28, and pressure reduction in an orifice 57 acts through an upper chamber side relief flow path 49 on an upper chamber 24B of a trim cylinder 24. Thus, in this tilt region, a piston rod 27 is held until a swivel bracket mounted to a propulsion unit abuts against the tip of a piston rod 27 of a trim cylinder device 18 and only a piston rod 29 of a tilt cylinder device 19 is received. Next, when a trim region is reached, a load of the propulsion unit acts on the piston rod 27 and the piston rods 27, 29 are housed nearly simultaneously. |
