System for recovering energy from a hydraulic actuator

  • US 10,844,885 B2
  • Filed: 07/05/2017
  • Issued: 11/24/2020
  • Est. Priority Date: 07/07/2016
  • Status: Active Grant
First Claim
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1. A system for recovering energy from a hydraulic actuator, the system comprising:

  • the hydraulic actuator;

    a source of hydraulic pressure in fluid communication with the hydraulic actuator for pressurizing the hydraulic actuator;

    a hydraulic accumulator assembly for selectively absorbing energy from the hydraulic actuator;

    a first one-way valve configured to provide fluid communication between the hydraulic actuator and the hydraulic accumulator assembly, the first one-way valve configured to permit a flow of fluid through the first one-way valve from the hydraulic actuator to the hydraulic accumulator assembly, and the first one-way valve configured to block a flow of fluid through the first one-way valve from the hydraulic accumulator assembly to the hydraulic actuator;

    an overcenter valve for selectively draining fluid from the hydraulic actuator via the overcenter valve, the overcenter valve having an open position and a closed position, the overcenter valve in the open position permitting the draining of fluid from the hydraulic actuator via the overcenter valve, and the overcenter valve in the closed position blocking the draining of fluid from the hydraulic actuator via the overcenter valve, the overcenter valve comprising a biasing member biasing the overcenter valve to the closed position, and the overcenter valve having a pressure-actuatable actuator configured to bias the overcenter valve to the open position; and

    a pressure-actuatable control valve configured to selectively apply, based at least on a hydraulic pressure in the hydraulic accumulator assembly, a hydraulic pressure on the pressure-actuatable actuator of the overcenter valve.

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