Staged hydraulic trim-tilt system

Details Staged hydraulic trim-tilt system Staged hydraulic trim-tilt system

1985-12-20

1987-08-18

Peters, Jr., Joseph F.

Marine propulsion

Screw propeller

With means effecting or facilitating movement of propulsion...

91399, 91189R, 91401, 440 53, B63H 512

Patent

active

046874496

ABSTRACT:
A hydraulic trim-tilt system for an outboard motor (10) utilizes a first pilot operated relief valve (48) in one trim piston (21) to limit the stroke of the trim pistons (21, 22) under load. After the trim pistons have reached the top of their stroke, under reduced load, the first pilot operated relief valve (48) is blocked and a second pilot operated relief valve (58) operates to allow a higher pressure to be supplied to the trim-tilt unit (16) to lift the outboard propulsion unit (15) in a higher shallow water drive range.

REFERENCES:
patent: 4064824 (1977-12-01), Hall et al.
patent: 4308018 (1981-12-01), Nakamura et al.
patent: 4391592 (1983-07-01), Hundertmark
patent: 4490120 (1984-12-01), Hundertmark

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