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Meterless hydraulic system having restricted primary makeup

  • US 8,966,892 B2
  • Filed: 08/31/2011
  • Issued: 03/03/2015
  • Est. Priority Date: 08/31/2011
  • Status: Active Grant
First Claim
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1. A hydraulic system, comprising:

  • a primary pump;

    a hydraulic actuator;

    first and second passages fluidly connecting the primary pump to the hydraulic actuator in a closed-loop manner;

    a charge circuit, the charge circuit including a displacement control valve configured to affect displacement control of the primary pump, wherein the charge circuit includes a charge pump and an accumulator configured to pressurize charge fluid in the charge circuit;

    a makeup valve movable to selectively allow charge fluid from the charge circuit to enter the first or second passages; and

    at least one restricted pilot passage configured to direct pilot fluid to the makeup valve to move the makeup valve and allow the charge fluid into the first and second passages.

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