Trimming/tilting system for marine propulsion unit

Details Trimming/tilting system for marine propulsion unit Trimming/tilting system for marine propulsion unit

1989-10-04

1991-04-16

Peters, Jr., Joseph F.

Marine propulsion

Screw propeller

With means effecting or facilitating movement of propulsion...

B63H 2126

Patent

active

050078666

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.

REFERENCES:
patent: 3722455 (1973-03-01), Carpenter
patent: 3799104 (1974-03-01), Kurling
patent: 3842789 (1974-10-01), Bergstedt
patent: 4096820 (1978-06-01), Hall

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