Power steering system

  • US 5,605,109 A
  • Filed: 04/17/1995
  • Issued: 02/25/1997
  • Est. Priority Date: 04/17/1995
  • Status: Expired due to Term
First Claim
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1. In a power steering system for a marine vehicle having a propulsion unit pivotal about a steering axis, and including an operator actuable steering helm and a steering member connected to said propulsion unit, which comprises:

  • power steering assist means including a hydraulic fluid cylinder-piston assembly having a reciprocally mounted piston thereby defining a chamber to either side of said piston to accommodate hydraulic fluid, and actuated in response to steering actuation at said steering helm;

    hydraulic fluid source means for delivery of pressurized hydraulic fluid to said cylinder-piston assembly;

    first valve means disposed in said cylinder-piston assembly biased to a closed position for a no steering change position and adapted to establish fluid communication between said cylinder-piston assembly and said fluid source means;

    means to selectively actuate said first valve means to establish said fluid communication upon steering actuation;

    actuatable input means to effect actuating input to said power steering assist means upon actuation at said steering helm;

    actuatable output means to effect common movement of said steering member in response to steering actuation of said steering helm to pivot said propulsion unit about said steering axis; and

    means for maintaining anti-feed back upon a failure in the fluid source means including second valve means to establish fluid communication between said fluid source means and said chamber to either side of said piston thereby maintaining said chamber substantially full of hydraulic fluid.

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