EP0447502B1 - Kraftstoffeinspritzventil - Google Patents

Kraftstoffeinspritzventil Download PDF

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Publication number
EP0447502B1
EP0447502B1 EP90911533A EP90911533A EP0447502B1 EP 0447502 B1 EP0447502 B1 EP 0447502B1 EP 90911533 A EP90911533 A EP 90911533A EP 90911533 A EP90911533 A EP 90911533A EP 0447502 B1 EP0447502 B1 EP 0447502B1
Authority
EP
European Patent Office
Prior art keywords
valve
magnet
valve needle
needle
magnet armature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90911533A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0447502A1 (de
Inventor
Stefan Maier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0447502A1 publication Critical patent/EP0447502A1/de
Application granted granted Critical
Publication of EP0447502B1 publication Critical patent/EP0447502B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • the invention relates to a fuel injection valve for fuel injection devices of internal combustion engines of the type defined in the preamble of claim 1.
  • the valve needle In a known fuel injection valve of this type (DE 35 40 660 Al), the valve needle carries an annular stop shoulder in the area between a valve needle guide in the valve chamber and the clamping of the valve needle in the magnet armature, which cooperates with a stop ring representing the stroke stop in the valve housing, the inside diameter of which is smaller than the outside diameter of the stop shoulder and that covers the valve space.
  • the stop ring is positioned in the valve housing so that when the stop shoulder rests against the stop ring, a residual air gap remains between the mutually facing end faces of the magnet core and the magnet armature.
  • the return spring for the valve needle which is designed as a cylindrical compression spring, is accommodated in the hollow cylindrical interior of the magnetic core and is supported in a recess in the end face of the magnet armature.
  • the annular stroke stop for the valve needle has the disadvantage that if the valve needle is not exactly aligned, the stop surface of the annular shoulder on the stop ring changes from annular to crescent-shaped, as a result of which the valve needle stroke does not correspond to the set stroke and, as a result, the amount of fuel injected varies.
  • the valve needle carries two relatively large-spaced guide sections with a larger diameter that slide along the inner wall of the valve chamber.
  • the guide sections are flattened laterally.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that a central stroke stop with a central stop point is realized while maintaining the adjustment option for the return spring of the valve needle, which in the axis of the Valve housing is.
  • the stop surface of the valve needle is therefore always punctiform, even when the valve needle is not exactly aligned, so that there is no change in stroke during the opening stroke of the valve needle.
  • the amount of fuel injected is therefore largely constant. Since the valve needle stroke is largely insensitive to the deviation of the valve needle axis from the valve housing axis, the valve needle also does not require any additional guides in the valve chamber, but rather requires guidance by the magnet armature and by centering in the valve seat. The manufacturing outlay for the fuel injector thus drops not insignificantly.
  • valve needle fastened in the magnet armature is passed through the magnet armature with its end section facing away from the valve opening, so that it hits the transverse web with its front end during the opening stroke, the result is that the soft magnetic components, such as the magnet armature, are not exposed to mechanical loads from the stroke stop. There is therefore no need to treat the surface of these components separately.
  • the valve needle on the other hand, has to be hardened anyway for other reasons, so that it can easily withstand the mechanical loads when struck.
  • a further manufacturing simplification of the fuel injection valve according to the invention is achieved in that the magnet armature has a coaxial blind bore that is open towards the magnet core, at the bottom of which the return spring surrounding the valve end section is supported, the slotted adjusting tube ending in the blind hole protrudes, and in that the magnet armature is guided axially displaceably on the adjusting tube with an annular guide section formed near the open end of the blind hole.
  • the fuel injection valve shown in longitudinal section in FIG. 1 for a fuel injection device of an internal combustion engine has a three-part housing 10 with an upper part 11, middle part 12 and lower part 13.
  • the hollow cylindrical lower part 13 containing a valve chamber 14 and the upper part 11 provided with an axial fuel inlet connection 15 are inserted into the cup-shaped central part 12 and held by flanging.
  • the valve space 14 is near the lower end of the lower part 13
  • Valve opening 16 delimited, which in turn is surrounded by a valve seat 17.
  • a valve needle 18, which is actuated by an electromagnet 20, works together with the valve seat 17.
  • An intermediate ring 19 is inserted between the end face of the lower part 13 and the middle part 12 which runs out like a nozzle on the pot bottom.
  • the upper part 11 covers the middle part 12 with a flange 21 and projects into the interior of the middle part 12 with a hollow cylindrical, nozzle-like coaxial projection 22. On the outside, the projection 22 continues in one piece into a tube section which forms the fuel inlet connection 15.
  • the electromagnet 20 consists in a known manner of a magnet housing, which is formed here directly by the cup-shaped central part 12 made of ferromagnetic material, from a coaxial magnetic core, which is formed here by the projection 22 of the upper part 11, also made of ferromagnetic material, from one the magnetic coil 22 surrounding the magnetic core 22 and a magnetic armature 24 guided in the base region of the central part 12 and opposite the magnetic core 22 on the end face.
  • the electrical supply line to the magnetic coil 23 is designated by 37.
  • the magnet armature 24 has a coaxial stepped bore 25.
  • the smaller-diameter bore section 251 firmly encloses the valve needle 18, which extends through the larger-diameter bore section 252 with a smaller-diameter end section.
  • a return spring 27 designed as a compression spring is supported, the other end of which rests against the annular end face of an adjusting tube 28 which is axially displaceable inside the hollow cylindrical upper part 11.
  • a stroke stop in the form of a cross piece 32 is fastened inside the hollow cylindrical magnetic core 22.
  • the adjusting tube 28 is slotted in the end region facing the return spring 27 and, with this slotted end section, overlaps the transverse web 32 on both sides with play, as can be seen more clearly in FIG. 3.
  • the crossbar 32 carries a central, i.e. in the valve housing axis lying stop 33, which is formed by a bulge 34 on the end face of the transverse web 32 facing the valve needle 18.
  • the arrangement and design of the magnet armature 24, the crosspiece 32 and the valve needle 18 is such that when the front end of the valve needle 18 is in contact with the stop 33 on the crosspiece 32, a residual air gap 35 remains between the facing end face of the magnet armature 24 and the magnet core 22, as can be seen in the enlarged representation in FIG. 2.
  • the maximum stroke of the valve needle 18 is characterized by the distance h in Fig. 2.
  • the crossbar 32 and the adjusting tube 28 are made of non-magnetic material.
  • the stop surface of the valve needle on the crosspiece 32 is always punctiform, even if the valve needle 18 is not exactly aligned with the axis of the valve housing 10.
  • the valve needle stroke thus remains constant even when the valve needle 18 is not exactly aligned. Every time the fuel injection valve is opened, the exact same fuel injection quantity is sprayed out.
  • the hollow cylindrical magnet armature 24 carries at the end a radially inwardly projecting annular guide section 36 which is integral with the magnet armature 24. With this guide section 36, the magnet armature 24 slides almost without play on the adjusting tube 28, as a result of which the magnet armature 24 is also guided exactly outside the bottom region of the magnet housing or the central part 12. Additional guide means for the valve needle 18 can thus be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP90911533A 1989-09-22 1990-08-16 Kraftstoffeinspritzventil Expired - Lifetime EP0447502B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3931604A DE3931604A1 (de) 1989-09-22 1989-09-22 Kraftstoffeinspritzventil
DE3931604 1989-09-22

Publications (2)

Publication Number Publication Date
EP0447502A1 EP0447502A1 (de) 1991-09-25
EP0447502B1 true EP0447502B1 (de) 1992-12-23

Family

ID=6389942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90911533A Expired - Lifetime EP0447502B1 (de) 1989-09-22 1990-08-16 Kraftstoffeinspritzventil

Country Status (8)

Country Link
US (1) US5131599A (ko)
EP (1) EP0447502B1 (ko)
JP (1) JPH04501905A (ko)
KR (1) KR920701657A (ko)
BR (1) BR9006921A (ko)
DE (2) DE3931604A1 (ko)
HU (1) HUT58864A (ko)
WO (1) WO1991004407A1 (ko)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365494B (en) * 1997-12-19 2002-05-15 Caterpillar Inc A solenoid assembly
RU2142064C1 (ru) * 1998-02-02 1999-11-27 ООО "Прецизика-сервис", Сухан Федор Федорович Электромагнитная форсунка для двигателя внутреннего сгорания
US6508418B1 (en) * 1998-05-27 2003-01-21 Siemens Automotive Corporation Contaminant tolerant compressed natural gas injector and method of directing gaseous fuel therethrough
US6431474B2 (en) 1999-05-26 2002-08-13 Siemens Automotive Corporation Compressed natural gas fuel injector having magnetic pole face flux director
US6405947B2 (en) 1999-08-10 2002-06-18 Siemens Automotive Corporation Gaseous fuel injector having low restriction seat for valve needle
US20090057446A1 (en) * 2007-08-29 2009-03-05 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7669789B2 (en) * 2007-08-29 2010-03-02 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US20090090794A1 (en) * 2007-10-04 2009-04-09 Visteon Global Technologies, Inc. Low pressure fuel injector
US20090200403A1 (en) * 2008-02-08 2009-08-13 David Ling-Shun Hung Fuel injector
EP2333297B1 (en) * 2009-12-11 2013-03-20 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
CN105804910B (zh) * 2016-03-19 2018-08-07 上海大学 一种高灵敏的柴油机喷油提前角传感器
US11603815B1 (en) 2021-11-04 2023-03-14 Standard Motor Products, Inc. Modular armature-needle assembly for fuel injectors

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE104450C1 (ko) *
SE105805C1 (ko) *
US4232830A (en) * 1978-11-01 1980-11-11 The Bendix Corporation Electromagnetic fuel injector
US4360161A (en) * 1979-01-29 1982-11-23 The Bendix Corporation Electromagnetic fuel injector
DE3878599T2 (de) * 1987-06-26 1993-09-23 Hitachi Automotive Eng Elektromagnetisches kraftstoffeinspritzventil.

Also Published As

Publication number Publication date
WO1991004407A1 (de) 1991-04-04
DE59000662D1 (de) 1993-02-04
HUT58864A (en) 1992-03-30
JPH04501905A (ja) 1992-04-02
DE3931604A1 (de) 1991-04-04
HU906832D0 (en) 1991-09-30
US5131599A (en) 1992-07-21
EP0447502A1 (de) 1991-09-25
BR9006921A (pt) 1991-11-26
KR920701657A (ko) 1992-08-12

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