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Hydraulic system with energy recovery

  • US 9,797,419 B2
  • Filed: 06/10/2015
  • Issued: 10/24/2017
  • Est. Priority Date: 06/13/2014
  • Status: Active Grant
First Claim
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1. A hydraulic system for recovering hydraulic energy, the hydraulic system comprising at least:

  • a first actuator for generating hydraulic energy and providing fluid under pressure,a tank line for receiving the fluid under pressure drained from the first actuator,a second actuator driven by the fluid under pressure drained from the first actuator,a recovery line for supplying the fluid under pressure drained from the first actuator to the second actuator for driving the second actuator, wherein the fluid pressure in the recovery line is dependent on the fluid pressure in the first actuator,a first directional control valve having at least one state in which the first actuator is in communication with the tank line and the recovery line, wherein the tank line and the recovery line receive the fluid under pressure from the first actuator via the first directional control valve,a second directional control valve having at least one state in which the second actuator is in communication with the recovery line, wherein the second actuator receives the fluid under pressure from the recovery line via the second directional control valve,a pressure compensating valve which controls flow of fluid in the tank line and maintains a fluid pressure differential across the first directional control valve when the first directional control valve is in the state connecting the first actuator, the tank line and the recovery line, which fluid pressure differential is dependent on a setting of the first pressure compensating valve, wherein the first pressure compensating valve is provided witha first fluid pressure sensing line in communication with the recovery line, anda second fluid pressure sensing line in communication with the first actuator when the first directional control valve is in the state connecting the first actuator, the tank line and the recovery line.

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