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Hydraulic excavator machine having self-contained electrohydraulic power units

  • US 4,193,733 A
  • Filed: 05/17/1978
  • Issued: 03/18/1980
  • Est. Priority Date: 05/17/1978
  • Status: Expired due to Term
First Claim
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1. A modular electrohydraulic high fluid pressure power unit for connection between a pair of relatively movable large components and operable to effect relative movement therebetween comprising:

  • a housing having a chamber therein defining a fluid reservoir and a pair of spaced apart openings on opposite sides of said chamber;

    a pair of hydraulic rams mounted in said openings on said housing in parallel spaced apart relationship, each ram comprising a cylinder, a piston in said cylinder, and a piston rod connected to said piston and extending from said cylinder;

    means mounted on said housing and on each piston rod for connecting said power unit to said pair of relatively movable components;

    a reversible hydraulic pump mounted within said chamber of said housing for supplying fluid to operate said hydraulic rams;

    an electric motor mounted on said housing between said pair of rams and connected to drive said pump;

    and remotely controllable means on said pump for controlling said pump.

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