Importance

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Abstract

A magnetically operated selector valve is used in the first two embodiments of this invention for controlling the flow of hydraulic fluid through a hydraulic tilt and trim system of a marine outboard drive unit to achieve quick tilting up of the drive unit and slow trimming movement of the drive unit between a plurality of trim positions. In each of these embodiments the selector valve is linked to a gear throttle control mechanism and a manual switch used to operate the pump. In the first embodiment, the system includes two fluid motors, preferably of the piston-cylinder type, interposed between the marine vessel and the drive unit for adjusting the tilt and trim of the unit. A reversible fluid pump is used to power the fluid motors and communicates with the fluid motors by way of conduits and hoses. To achieve slow trimming movement of the drive unit, the valve is adjusted so that the pump delivers hydraulic fluid to one fluid chamber of each fluid motor simultaneously while fluid in the other chamber of each fluid motor is discharged back to the pump. In the quick tilt-up mode, the valve is adjusted so that the pump delivers twice the hydraulic fluid to only one of the fluid motors.

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First Claim