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Shovel

  • US 10,060,096 B2
  • Filed: 08/04/2016
  • Issued: 08/28/2018
  • Est. Priority Date: 03/06/2014
  • Status: Active Grant
First Claim
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1. A shovel comprising:

  • a lower travelling body;

    an upper swivel body;

    an operation attachment;

    an engine;

    a motor generator which is connected to the engine;

    a hydraulic pump which is connected to the motor generator and supplies hydraulic oil to the operation attachment;

    a swiveling electric motor which is mounted on the upper swivel body;

    a power storage device;

    a DC bus which electrically connects the power storage device and the swiveling electric motor to each other; and

    a control device,wherein the control device decreases a charging/discharging limit value of the power storage device and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device to the swiveling electric motor, according to a decrease of temperature.

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