Power steering assist

  • US 5,603,279 A
  • Filed: 04/17/1995
  • Issued: 02/18/1997
  • Est. Priority Date: 04/17/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A power steering assist system comprising:

  • (a) a rotatable input member;

    (b) a hydraulic cylinder having a reciprocally mounted piston and fluid passageways longitudially spaced to each side of said piston to form a first chamber and a second chamber in said cylinder, the effective areas of each side of said piston being unequal;

    (c) fluid source means for supplying pressurized hydraulic fluid to said cylinder;

    (d) valve control means operably connected to said input member and having a rotatable valve body, said valve control means adapted to selectively control the flow of hydraulic fluid to said cylinder whereby the resulting reciprocal movement of said piston is determined by the flow of pressurized fluid supplied to or exhausted from the chamber having the piston side of greater effective area; and

    (f) output means operably connected to said piston.

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