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Power system and work machine using same

  • US 7,197,871 B2
  • Filed: 11/14/2003
  • Issued: 04/03/2007
  • Est. Priority Date: 11/14/2003
  • Status: Expired due to Fees
First Claim
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1. A power system comprising:

  • an electric motor being operable to power a hydraulic pump;

    at least one hydraulic cylinder being fluidly connected to the hydraulic pump and defining a first fluid volume and a second fluid volume separated from one another via a moveable plunger;

    a variable displacement hydraulic motor being fluidly connected directly to the first fluid volume defined by the hydraulic cylinder, with no intervening valve, and being operable to power a generator; and

    a power storage system operably coupling the generator to the electric motor.

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