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Fuel injection nozzle

  • US 4,413,781 A
  • Filed: 12/21/1981
  • Issued: 11/08/1983
  • Est. Priority Date: 12/22/1980
  • Status: Expired due to Fees
First Claim
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1. A fuel injection nozzle for the delivery of fuel, premixed with air, to the combustion chamber of a cylinder in an internal combustion engine, comprising:

  • (a) a nozzle body having formed therein an axial passage and at least one spray hole for communicating the axial passage with the combustion chamber of the engine cylinder;

    (b) a piston slidably mounted in said nozzle body for reciprocating movement between a first and a second position and defining in combination therewith a first and a second chamber therein;

    (c) said nozzle body having formed therein a fuel inlet port and an air inlet port, the fuel inlet port being open to the second chamber when said piston is in the first position and being closed when said piston is in the second position, the air inlet port being open to the first chamber when said piston is in the second position and being closed when said piston is in the first position;

    (d) a valve member fixedly secured to said piston and therefore reciprocable in the axial passage of said nozzle body between the first and second positions for opening and closing the spray hole, the communication between the second chamber and the axial passage being blocked when said valve member is between the first position and a third position which is intermediate the first and second positions and being established when said valve member is between the second and third positions;

    (e) conduit means for communicating the air inlet port with the combustion chamber; and

    (f) means mounted in said piston for allowing the air flow from the first chamber to the second chamber but blocking the flow in the opposite direction.

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