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Hydraulic system and forklift with the same

  • US 20060070793A1
  • Filed: 09/12/2005
  • Published: 04/06/2006
  • Est. Priority Date: 09/10/2004
  • Status: Abandoned Application
First Claim
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1. A hydraulic system comprising:

  • a hydraulic actuator which actuates a movable member to make a determined motion;

    a hydraulic pump which supplies hydraulic oil from a tank which contains the hydraulic oil to the hydraulic actuator by an electric motor, wherein the hydraulic oil is recovered from the hydraulic actuator to the tank by a load which has been applied to the hydraulic actuator through the movable member in a state where the hydraulic oil is not supplied from the hydraulic pump;

    at least one hydraulic pipe disposed between the hydraulic actuator and the tank, the at least one hydraulic pipe including a hydraulic pipe which recoveries the hydraulic oil;

    a hydraulic motor provided in the hydraulic pipe which recoveries the hydraulic oil, the hydraulic motor driven on receipt of the hydraulic oil from the hydraulic actuator when the hydraulic oil is recovered from the hydraulic actuator;

    a drive transmitting device which is connected to both the hydraulic motor and the electric motor to transmit a driving torque from the hydraulic motor to the electric motor; and

    a control unit which conducts regenerative control of the electric motor according to rotation number of the electric motor, when the electric motor is driven by the hydraulic motor.

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