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Power steering system including a rotary control valve with multiple variable orifice configurations

  • US 5,845,737 A
  • Filed: 01/19/1996
  • Issued: 12/08/1998
  • Est. Priority Date: 01/19/1995
  • Status: Expired due to Fees
First Claim
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1. A power steering apparatus comprising a fluid source for supplying pressurized fluid, a reservoir, a power cylinder having two fluid chambers, and a control valve for controlling a flow of the pressurized fluid supplied from said fluid source according to the operation of a steering wheel, said control valve comprising:

  • a first control means for controlling the flow of pressurized fluid drained from said fluid source to said reservoir, said first control means having at least an underlapping variable orifice which takes the form of underlap in itself in a neutral state of said control valve; and

    a second control means for controlling the flow of pressurized fluid supplied from said fluid source to said power cylinder, said second control means having at least an overlapping variable orifice which takes the form of overlap in itself in the neutral state of said control valve.

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