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Pump/nozzle unit for fuel injection in internal combustion engines

  • US 4,571,161 A
  • Filed: 03/21/1985
  • Issued: 02/18/1986
  • Est. Priority Date: 03/28/1984
  • Status: Expired due to Fees
First Claim
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1. A pump/nozzle unit for fuel injection in internal combustion engines comprising:

  • (a) a pump housing receiving a piston-type injection pump provided with an injection nozzle at one end thereof;

    (b) a pump piston axially guided in a cylindrical bore in the pump housing said pump piston being rotatable by means of a regulating sleeve disposed coaxially therewith in order to vary an effective supply stroke and actuable via a drive tappet counter to force exerted by a tappet spring;

    (c) a guide bushing secured on the pump housing and provided with a sleeve-like guide part for said drive tappet and an end face forming an axially positional securing means for the regulating sleeve;

    (d) an extremity face being provided on the drive side on the pump housing;

    (e) an actuation flange being provided on the pump housing at least indirectly engaged by securing means for securing the pump/nozzle unit to the engine;

    (f) said guide bushing being provided with a bushing flange protruding radially outward beyond an outer diameter of the tappet spring, said bushing flange being provided with an end face resting on said extremity face on the drive side of the pump housing and extending into a region provided adjacent the extremity face for engagement by said securing means of the pump/nozzle unit;

    (g) said bushing flange being secured on the pump housing by a holder means;

    (h) said holder means for the guide bushing being arranged to pass through an oblong slot in the bushing flange of the guide bushing and be secured to a securing flange of the pump housing;

    (i) said regulating sleeve being provided with a radially protruding control lever arm associated with a control lever arm regulating means;

    (j) said guide bushing having a flange area in which is disposed a recess provided as a circular segmented ring in which a cutaway is provided allowing passage therethrough of said control lever arm, said recess being further provided with lateral limiting edges defining a maximum pivoting range for said control lever arm in at least one pivoting direction; and

    (k) said flange of said guide bushing provided with at least one oblong slot for receiving said holder means, said at least one oblong slot being arranged to allow said guide bushing to be slightly rotatable within a limited range of movement, wherebyadjustment of a fuel supply quantity provided by said pump/nozzle unit is faciliated.

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