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Hydraulic oscillator as a drive of machines

  • US 6,647,719 B2
  • Filed: 01/24/2002
  • Issued: 11/18/2003
  • Est. Priority Date: 02/17/2001
  • Status: Expired due to Fees
First Claim
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1. A device for driving a machine element, comprising:

  • a hydraulic actuator operatively connected to a machine element and having a first cylinder and a first piston reciprocating in the first cylinder;

    a hydraulic pump connected in a dosed hydraulic circuit to the actuator;

    a variable-speed electric motor which drives the hydraulic pump; and

    at least one energy accumulator operatively connected to a member selected from the group consisting of piston and machine element to only apply a potential force on the member in dependence on a position of the member, wherein the energy accumulator is loaded or unloaded in response to a movement of the member.

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