Trim and tilt control for marine propulsion devices

Details Trim and tilt control for marine propulsion devices Trim and tilt control for marine propulsion devices

1984-01-27

1986-08-12

Basinger, Sherman D.

Marine propulsion

Means to control the supply of energy responsive to a sensed...

440 61, B63H 2126

Patent

active

046053751

ABSTRACT:
The electrical control for a hydraulically-actuated trim and tilt system of a marine propulsion device includes a trim-tilt switch movable between "off", "up" and "down" positions, a motion-actuated position switch movable from a "trim" position to a "tilt" position in response to a tiltable propulsion assembly being pivoted upwardly beyond the upper end of a range of trim positions, a pressure-actuated thrust switch which senses an increase in the hydraulic pressure in part of the hydraulic system due a placement of the piston of the hydraulic actuator under load in response to increasing propelling thrust and which is movable from a "low" thrust position to a "high" thrust position in response to the hydraulic pressure exceeding a predetermined level corresponding to a predetermined propeller thrust level, and a reversible electrical motor driving a reversible hydraulic pump which supplies pressurized hydraulic fluid to the hydraulic actuator. The switches, an electrical source, and the motor are electrically interconnected such that the pump is operated to cause downward pivotal movement of the propulsion assembly in response to movement of the trim-tilt switch to the "down" position, to cause upward pivotal movement of the propulsion assembly in response to movement of the trim-tilt switch to the "up" position, except when the position switch is in the "tilt" position and the thrust switch is in the "high" thrust position, and to cause downward pivotal movement of the propulsion assembly when the position switch is in the "tilt" position and the thrust switch is in the "high" thrust position irrespective of the position of the trim-tilt switch.

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