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Hybrid machine with hydraulic drive device

  • US 6,962,050 B2
  • Filed: 05/18/2001
  • Issued: 11/08/2005
  • Est. Priority Date: 05/19/2000
  • Status: Expired due to Fees
First Claim
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1. A hybrid machine with a hydraulic drive device, comprising a power source, a generator driven by power of said power source, electric motors, and a secondary battery for storing electromotive force of said electric motors generated by reverse driving of said electric motors by external loads, said electric motors receiving electric power from said generator and said secondary battery so as to be driven, said hybrid machine comprising:

  • hydraulic cylinders allowed to be extended and contracted against and by external loads;

    first hydraulic pumps connected, with closed circuits, to head side pressure receiving chambers and bottom side pressure receiving chambers of said hydraulic cylinders; and

    second hydraulic pumps connected, with open circuits, to said bottom side pressure receiving chambers and an external oil chamber, wherein said first and second hydraulic pumps are connected to said electric motors so as to be driven.

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