Hydraulic trim tile system for outboard propulsion units using a pressure amplifier
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United States of America Patent
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Jul 3, 1984
Issued Date -
N/A
app pub date -
Aug 17, 1981
filing date -
Aug 27, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic system for trimming a marine outboard drive, and wherein a single actuator for moving the propulsion unit is used for both trim and tilt. The actuator is connected to a hydraulic pump. A pump pressure amplifier is connected to the actuator. The amplifier has first and second ports connecting the actuator and to the hydraulic pump. The amplifier includes a switch for bypassing the amplifier to pass the hydraulic fluid from the pump to the actuator without amplification. The switch is operable for bypassing the amplifier for rapidly tilting the propulsion unit and operable for connecting the amplifier within the hydraulic circuit to develop increased pressure for trimming the propulsion unit. The hydraulic amplifier includes a piston movable within a cylinder. Movement of the hydraulic amplifier piston to one end of the hydraulic amplifier, cylinder actuates the switch to bypass the amplifier and movement in the other direction away from that end, switches and amplifier to its amplification mode, the amplifier continuing in its amplification mode until the amplifier piston reaches a limit switch placed in its path to bypass the amplifier hydraulic circuit.
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