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US4771984A Expired / Lapsed US ⏱️ 0.0 years remaining

Electromagnetically actuatable fuel-injection valve

Assignee: Mannesmann VDO AG
•
Filing: 1987-01-30
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Granted: 1988-09-20
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Expires: 2007-01-30
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Abstract

Abstract In a fuel-injection valve, an armature (7) having upper and lower guide surfaces (12, 13) is arranged within a valve housing (1). Via the upper guide surface (12), the armature (7) is guided in a guide borehole (15) of the valve housing (1) directly below the magnet winding (3) of the fuel-injection valve. In this way the losses of magnetic flux are very small.

Inventors

  • 👤 Piotr Szablewski
  • 👤 Wolfgang Sauerschell

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 12:18
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0664; F02M51/0671; F02M51/0675; F02M61/00; F02M61/04; F02M61/10; F02M61/12; F02M61/16; F02M61/162; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/2022

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 237 words
An electromagnetically actuatable fuel-injection valve for injection systems of internal-combustion engines, comprising a valve housing wth a fixed magnet winding, a soft-iron core disposed within the valve housing and surrounded by the magnet winding; and an armature which is arranged coaxially with and facing said core, there being a working air gap between the core and the armature permitting displacement of the armature, the armature comprising a valve closure element which controls an outlet of the valve, the armature including upper and lower guide surfaces for guiding the armature within the valve housing, the lower guide surface being located close to the valve closure element; and wherein the valve housing has a guide bore, and the upper guide surface of the armature is located directly below the magnet winding and is guided within the guide bore of the valve housing; the valve further comprising a guide element which is seated, sealing towards the valve outlet, in a coaxial inner bore of the valve housing which is open towards the valve outlet; and wherein said lower guide surface of the armature is guided by said guide element; the valve further comprising a spacer disk located between an upper face surface of the guide element and a shoulder of the valve housing, which shoulder is directed towards the outlet of the injection valve, there being a valve seat provided on the guide element for receiving said valve closure element.
Claim 2
Dependent Claim 237 words
An electromagnetically actuatable fuel-injection valve for injection systems of internal-combustion engines, comprising a valve housing wth a fixed magnet winding, a soft-iron core disposed within the valve housing and surrounded by the magnet winding; and an armature which is arranged coaxially with and facing said core, there being a working air gap between the core and the armature permitting displacement of the armature, the armature comprising a valve closure element which controls an outlet of the valve, the armature including upper and lower guide surfaces for guiding the armature within the valve housing, the lower guide surface being located close to the valve closure element; and wherein the valve housing has a guide bore, and the upper guide surface of the armature is located directly below the magnet winding and is guided within the guide bore of the valve housing; the valve further comprising a guide element which is seated, sealing towards the valve outlet, in a coaxial inner bore of the valve housing which is open towards the valve outlet; and wherein said lower guide surface of the armature is guided by said guide element; the valve further comprising a spacer disk located between an upper face surface of the guide element and a shoulder of the valve housing, which shoulder is directed towards the outlet of the injection valve, there being a valve seat provided on the guide element for receiving said valve closure element.
Claim 3
Dependent Claim 38 words
An electromagnetically actuatable fuel-injection valve according to claim 8, wherein the valve housing is provided, directly below the magnet winding, with an inwardly facing annular disk within which the guide bore is disposed coaxially to the soft-iron core.
Claim 4
Dependent Claim 39 words
An electromagnetically actuatable fuel-injection valve according to claim 2, wherein said armature comprises a flange-like outward directed stop collar which is displaceable against the annular disk on a side thereof facing the valve outlet, upon movement of said armature.
Claim 5
Dependent Claim 44 words
An electromagnetically actuatable fuel-injection valve according to claim 1, wherein said soft-iron core is formed as a screw part having an armature-side end surface which limits the working air gap, said core being axially displaceable upon rotation of the core within the valve housing.
Claim 6
Dependent Claim 45 words
An electromagnetically actuatable fuel-injection valve according to claim 2, wherein at least one axial passageway leading to the magnet winding is provided in said annular disk and the valve housing, said passageway including a return flow outlet at an upper end of the magnet winding.
Claim 7
Dependent Claim 23 words
An electromagnetically actuatable fuel-injection valve according to claim 2, further comprising a fuel-inlet opening located below said annular disk of the valve housing.
Claim 8
Dependent Claim 27 words
An electromagnetically actuatable fuel-injection valve according to claim 1, further comprising a nozzle body in said inner bore; said guide element being held by said nozzle body.

References Cited (Backward Citations)

GB259023A Cited
NL55992C Cited
US3429552A Cited
US4310123A Cited
US4423841A Cited
US4437488A Cited
US4651931A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-09-20 1992-03-21 1992-09-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-09-20 1996-03-21 1996-09-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-09-20 2000-03-21 2000-09-20 $7700.00 Window Closed / Lapsed

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