Trimming/tilting system for marine propulsion unit
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United States of America Patent
Stats
-
Apr 16, 1991
Grant Date -
N/A
app pub date -
Oct 4, 1989
filing date -
Oct 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic tilt and trim system for a marine outboard drive unit for effecting quick tilting-up of the drive unit and slow trimming of the drive unit through a plurality of trim positions. 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 drive unit. A reversible fluid pump is used to power the fluid motors and communicates with the fluid motors by way of conduits and hoses. The system further includes a selector valve, which is manually or magnetically operated, to control the flow of hydraulic fluid from the pump to the fluid motors. 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 the 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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