×

Hybrid construction machine

  • US 9,057,173 B2
  • Filed: 10/03/2011
  • Issued: 06/16/2015
  • Est. Priority Date: 10/08/2010
  • Status: Active Grant
First Claim
Patent Images

1. A hybrid construction machine having a prime mover, an ignition switch for starting and stopping the prime mover, a hydraulic pump which is driven by the prime mover, a swing structure, an electric motor for driving the swing structure, an electricity storage device which is connected to the electric motor, an inverter for driving the electric motor, hydraulic actuators which are driven by the hydraulic pump, a swing brake which is driven by hydraulic pressure and stops the rotation of the swing structure, a gate lock lever switch which is used for selecting whether to mobilize or immobilize the hydraulic actuators, and a swing control lever device which is used for commanding the driving of the swing structure, wherein the hybrid construction machine comprises:

  • an inverter controller which outputs a PWM signal to the inverter and thereby controls the revolution speed of the electric motor;

    a first electric circuit including blocking means which blocks the PWM signal outputted from the inverter controller to the inverter in response to either an immobilization selection inputted through the gate lock lever switch or an OFF selection inputted through the ignition switch; and

    a second electric circuit including a swing brake solenoid valve which activates the swing brake in response to either the immobilization selection inputted through the gate lock lever switch or the OFF selection inputted through the ignition switch.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×