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Fuel injection nozzle for internal combustion engines

  • US 4,982,708 A
  • Filed: 02/12/1990
  • Issued: 01/08/1991
  • Est. Priority Date: 06/22/1989
  • Status: Expired due to Fees
First Claim
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1. A fuel injection nozzle for internal combustion engines, having a valve needle, a nozzle body (38) having an injection end, said nozzle body is provided with a central bore that receives and guides said valve needle, said central bore merges on a nozzle body face end toward the injection end with a wall face (50) that expands conically outward to form a valve seat (76), said valve needle including a closing head which closes against said wall face end, said closing head is pressed against the valve seat by a closing spring counter to a flow direction of an injection fuel delivered through said central bore, said conical wall face (50) forming the valve seat (76) is disposed on the nozzle body (38) on a center axis which is at an angle (a) to the longitudinal axis (72) of the valve needle (42) and said closing head (44) of the valve needle (42) includes a spherically curved sealing face (74) that cooperates with the valve seat (76) on the nozzle body (38) to form an emerging conical fuel injection stream (80).

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