| 摘要 |
A hydraulic pressure mechanism for angularly lifting and lowering an outboard engine includes a hydraulic cylinder unit comprising a piston assembly and a hollow cylinder, the piston assembly being slidably fitted in the hollow cylinder and dividing a hollow space therein into a first oil chamber and a second oil chamber, a tank for storing working oil, a pump for delivering working oil from the tank to the hydraulic cylinder unit, and a spool valve for supplying working oil from the tank through the pump selectively and exclusively to the first and second oil chambers, thereby to cause the piston assembly and the cylinder to move relatively to each other for enabling the hydraulic cylinder unit to tilt the outboard engine. The cylinder has a tilt-limit hole defined in a side wall thereof in a range in which the piston assembly is slidable in the cylinder, so that the tilt-limit hole can be closed by the piston assembly thereby to limit sliding movement of the piston assembly with respect to the cylinder under at least external forces applied. The hydraulic pressure mechanism also has a valve for bringing the tilt-limit hole exclusively into communication with the tank through a flow passage.
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