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US4715541A Expired / Lapsed US ⏱️ 0.0 years remaining

Fuel injection nozzle for combustion engines

Assignee: Steyr Daimler Puch AG
•
Filing: 1986-02-25
•
Granted: 1987-12-29
•
Expires: 2006-02-25
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Abstract

Abstract A fuel injection nozzle for internal combustion engines comprises a nozzle body (1) and a nozzle needle (5) guided therein. The nozzle body (1) terminates in a nozzle cap (3) in which ejection bores (4) are provided and which forms at the inside a conical valve seat (6) against which the nozzle needle (5) is pressed. The nozzle needle (5) lifts under the pressure of the fuel supplied in a first lifting phase against the force of a spring (8) off the valve seat (6) and bears on a stop (19). This stop (19) is limitedly displaceable in a second lifting phase against the force of a further spring (9). To reduce the hydrocarbon emissions in the exhaust gases of the internal combustion engine and diminish ignition noise, the generated surface (M) of the imaginary cylinder formed in extension of the ejection bore (4) between the inner edge (R) thereof and the surface of the nozzle needle (5) lifted off the valve seat in the first lifting phase is made smaller than the cross-section of the ejection bore (4).

Inventors

  • 👤 Otto Freudenschuss
  • 👤 Gunther Herdin
  • 👤 Harald Schmidt
  • 👤 Emerich Schreiner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 02:30
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/18; F02M45/00; F02M45/02; F02M45/04; F02M45/08; F02M45/083

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 168 words
A fuel injection nozzle for internal combustion engines, comprising a nozzle body having a longitudinal axis, a nozzle cap at one end of said nozzle body, said nozzle cap having a fuel ejection bore therein for delivery of fuel to a combustion chamber, said nozzle cap including a valve seat, a nozzle needles guided within said nozzle body along said axis, first and second spring means acting in series to bias said nozzle needle towards said valve seat to close said fuel ejection bores, said nozzle needle being displaceable away from said valve seat in a first displacement phase against the force of said first spring means and a second displacement phase against the force of said second spring means, the outer surface area of an imaginary cylinder formed as a projection from said fuel ejection bores against said nozzle needle when said nozzle needle is displaced away from said valve seat being smaller than the cross-sectional area of said fuel ejection bore throughout said first displacement phase.
Claim 2
Dependent Claim 168 words
A fuel injection nozzle for internal combustion engines, comprising a nozzle body having a longitudinal axis, a nozzle cap at one end of said nozzle body, said nozzle cap having a fuel ejection bore therein for delivery of fuel to a combustion chamber, said nozzle cap including a valve seat, a nozzle needles guided within said nozzle body along said axis, first and second spring means acting in series to bias said nozzle needle towards said valve seat to close said fuel ejection bores, said nozzle needle being displaceable away from said valve seat in a first displacement phase against the force of said first spring means and a second displacement phase against the force of said second spring means, the outer surface area of an imaginary cylinder formed as a projection from said fuel ejection bores against said nozzle needle when said nozzle needle is displaced away from said valve seat being smaller than the cross-sectional area of said fuel ejection bore throughout said first displacement phase.
Claim 3
Dependent Claim 49 words
The fuel injection nozzle of claim 1 further comprising stop means associated with first spring means, said nozzle needle engaging said stop means at the end of said first displacement phase, said stop means being movable against the face of said second spring means during said second displacement phase.
Claim 4
Dependent Claim 19 words
The fuel injection nozzle of claim 1 wherein said second spring means is stronger than said first spring means.
Claim 5
Dependent Claim 19 words
The fuel injection nozzle of claim 1 wherein said first and second spring means are disposed about said axis.
Claim 6
Dependent Claim 19 words
The fuel ejection nozzle of claim 4 wherein said second spring means is disposed about said first spring means.

References Cited (Backward Citations)

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US1735718A Cited
GB1284797A Cited
DE2324475A1 Cited
GB1418574A Cited
DE2711350A1 Cited
US4168804A Cited
GB2074234A Cited
DE3239462A1 Cited
DE3239461A1 Cited
US4470548A Cited
US4540126A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-12-28 1991-06-29 1991-12-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-12-28 1995-06-29 1995-12-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-12-28 1999-06-29 1999-12-29 $7700.00 Window Closed / Lapsed

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