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Meterless hydraulic system having multi-actuator circuit

  • US 9,057,389 B2
  • Filed: 09/30/2011
  • Issued: 06/16/2015
  • Est. Priority Date: 09/30/2011
  • Status: Active Grant
First Claim
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1. A hydraulic system, comprising:

  • a pump;

    a rotary actuator;

    a linear actuator;

    a closed-loop circuit fluidly connecting the pump to the rotary and linear actuators, wherein the closed loop circuit includes;

    a first pump passage fluidly connected between the pump and the rotary actuator;

    a second pump passage fluidly connected between the pump and the rotary actuator;

    a first actuator passage fluidly connected to a first chamber of the linear actuator; and

    a second actuator passage fluidly connected to a second chamber of the linear actuator; and

    at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the rotary actuator, wherein the at least one valve includes;

    a first valve disposed between the first pump passage and the first actuator passage;

    a second valve disposed between the first pump passage and the second actuator passage;

    a third valve disposed between the second pump passage and the first actuator passage; and

    a fourth valve disposed between the second pump passage and the second actuator passage.

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