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Servocylinder unit

  • US 4,972,819 A
  • Filed: 09/14/1988
  • Issued: 11/27/1990
  • Est. Priority Date: 03/22/1986
  • Status: Expired due to Term
First Claim
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1. A servocylinder unit for adjusting an amount of fuel fed to a vehicle drive engine, said servocylinder unit comprising:

  • a cylinder having a longitudinal axis, a loading chamber at one end thereof, and a part immovably connected with said cylinder at the other end thereof;

    a valve arrangement supplying a pressure medium from an injection pump to said piston;

    a drive slippage governor connected with said valve arrangement and controlling said valve arrangement;

    a piston displaceable in said cylinder under the action of the pressure medium and limiting said loading chamber in said cylinder;

    pre-stressed spring means located between a gas pedal and the injection pump and on an opposite side of said piston from said loading chamber for biasing said piston to an initial position thereof and including;

    a first spring acting on said piston for enabling regulation of a number of revolutions of the vehicle drive engine,a first stop located in said cylinder for supporting said first spring and displaceable along the longitudinal axis of said cylinder,a second spring extending between said first stop and said part of said cylinder and compressible to enable switching off of fuel feeding, anda second stop fixed to said cylinder and engageble by said first stop under a biasing force of said second spring,said second spring having a higher pre-stress than said first spring and a spring rigidity which is smaller than that of said first spring.

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