EP0504147B1 - Elektromagnetisch betätigbares kraftstoffeinspritzventil - Google Patents

Elektromagnetisch betätigbares kraftstoffeinspritzventil Download PDF

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Publication number
EP0504147B1
EP0504147B1 EP90915088A EP90915088A EP0504147B1 EP 0504147 B1 EP0504147 B1 EP 0504147B1 EP 90915088 A EP90915088 A EP 90915088A EP 90915088 A EP90915088 A EP 90915088A EP 0504147 B1 EP0504147 B1 EP 0504147B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
guide ring
injection valve
fuel
swirl
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
EP90915088A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0504147A1 (de
Inventor
Max Greiner
Peter Romann
Ferdinand Reiter
Rudolf Babitzka
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 EP0504147A1 publication Critical patent/EP0504147A1/de
Application granted granted Critical
Publication of EP0504147B1 publication Critical patent/EP0504147B1/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
    • 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
    • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
    • 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • a generic fuel injector is already known.
  • a part called a nozzle and a separate guide ring are assembled.
  • the guide ring with valve seat and with a hollow cylindrical guide track guides the valve closing body during its axial movement.
  • the nozzle is provided with an outlet opening for the fuel to be injected and receives the guide ring in a press fit.
  • Fuel injection valves are also known in which the nozzle and the valve seat are formed into a one-piece valve seat body - without a hollow cylindrical guideway.
  • the manufacturing effort for the guide ring with valve seat is high due to the high accuracy requirements for the concentricity of the hollow cylindrical guide track to the valve seat.
  • the nozzle must be machined very precisely in the area where the guide ring is received. This increases the cost of the individual parts and the assembly effort when assembling them. Slightly exceeding the dimensional tolerances of these individual parts can lead to a deformation of the valve seat when the fuel injector is installed. Such quality defects result in higher kinetic friction between the valve closing member, the guideways and the valve seat with far-reaching consequences.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that the guide ring and the nozzle with the valve seat and the at least one outlet opening can be produced and assembled in a simple manner and separately, so that the hollow cylindrical guide path of the guide ring Valve closing body with a particularly narrow clearance concentrically leads so that its position is precisely determined, especially when the valve closing body opens, around which fuel flows.
  • the guide ring is held on the nozzle axially spaced from the valve seat and the fuel outlet opening by means of a welded connection.
  • the guideway of the guide ring and the valve seat are aligned with high precision.
  • This exact position is particularly easy to adjust due to the large radial play with which the outer circumference of the guide ring sits in the central longitudinal bore of the nozzle before the ideal position is secured by welding.
  • the guideway is adjusted individually to the valve seat.
  • the friction between the valve seat and the valve closing body is reduced because eccentricities of the valve closing body to the valve seat are reduced by the narrow guide. This results in a more precise response of the fuel injection valve, more precise metering of the fuel and an improved fuel spray pattern. Due to the radial distance from the central longitudinal bore, the guide ring is hardly deformable due to temperature fluctuations.
  • the guide ring consists of sheet metal and that the sheet is a spring steel sheet which is perforated many times. It is also advantageous that the fuel swirl openings are designed as swirl grooves penetrating the guideway of the guide ring and inclined to the axis of the longitudinal bore, or that the fuel swirl openings are designed as swirl holes penetrating the guide ring. A further advantage arises from the fact that the fuel swirl openings are supplemented by flow surfaces in the form of swirl flaps formed in the region of the guideway and bends. An additional advantage is obtained if the guide ring consists of spiral, ring-shaped wire, sponge-like, large-pored material or if the guide ring is covered with bristles, the free ends of which form the hollow cylindrical guide track.
  • FIG. 1 shows the sectional view of the valve seat area of a fuel injection valve
  • FIG. 2 shows the cross section of a valve seat body with a welded-in guide ring
  • FIG. 3 shows the top view of a valve seat body
  • FIG. 4 shows the cross section of a valve seat body with sheet metal guide ring
  • FIG. 5 shows the cross section of a valve seat body with a spiral guide ring.
  • the fuel injection valve 1 shown in FIG. 1 for a fuel injection system of compression-ignition, spark-ignition internal combustion engines has a valve housing 3 with a central through opening 4, in which a nozzle 5 is fastened by means of a welded connection 6.
  • a nozzle 5 In the nozzle 5 sits in a central longitudinal bore 13 via a further weld connection 2 held a guide ring 7 with a central, hollow cylindrical guide track 14.
  • the diameter of the longitudinal bore 13 is larger than the outer diameter of the guide ring 7, so that this before welding with radial play sits in the longitudinal bore 13.
  • This game is dimensioned so that the welded joint 2 after adjusting the guide ring 7 can fill the space between its outer peripheral surfaces and the wall of the longitudinal bore 13.
  • the nozzle 5 Downstream of the guide ring 7, the nozzle 5 further has a valve seat 8 and subsequently at least one outlet opening 9 for fuel injection into an intake manifold of an internal combustion engine.
  • a tubular valve closing member 10 with radial openings 11 projects through the passage opening 4.
  • the valve closing member 10 On the side facing the valve seat 8, the valve closing member 10 carries a valve closing body 12, for example in the form of a hardened ball.
  • the valve closing member 10 On the side facing away from the valve seat 8, the valve closing member 10 carries an armature 15 made of soft magnetic material.
  • the valve closing body 12 projects into the guide ring 7, which engages around it with little play with its hollow cylindrical guide track 14.
  • the valve closing body 12 is in the closed state of the fuel injection valve 1 sealingly against the valve seat 8.
  • the fuel can flow through fuel swirl openings formed on the guide ring 7, for example in the form of swirl grooves 16, from upstream of the guide ring 7 to the valve seat 8 downstream.
  • the swirl grooves 16 can extend obliquely to the axis of the valve closing member 10 in the guideway 14.
  • a compression spring 17 acts on the valve closing member 10 in the direction of flow.
  • a magnet coil 18 is arranged adjacent to the armature 15 in such a way that, as soon as it is excited, the armature 15 lifts against the force of the compression spring 17.
  • an electrical circuit (not shown) of the magnet coil 18 is closed. The magnetic forces then effective attract armature 15.
  • the valve closing body 12 of the valve closing member 10 is moved away from the valve seat 8, counter to the pressure spring 17, so that the fuel passes through the valve closing member 10 and its radial openings 11 through the swirl grooves 16 to the valve seat 8 and downstream to the at least one outlet opening 9 arrive and can be hosed.
  • the nozzle 5 is shown with the guide ring 7 as an assembly.
  • the weld connection 2 which can be designed as a seam or spot weld between the nozzle 5 and the guide ring 7, and the swirl grooves 16 in the hollow cylindrical guide track 14, which run inclined to the axis of the nozzle 5, are clearly shown here.
  • the valve seat 8 and the outlet opening 9 can be seen.
  • the guide ring 7 is located in the longitudinal bore 13 axially spaced from the valve seat 8.
  • the guide ring 7, as in the prior art can be machined inside, ie in the region of the guide track 14, with high accuracy.
  • the outer circumference of the guide ring 7 can be machined with low accuracy because it sits with play in the longitudinal bore 13 before the weld connection 2 is established.
  • the valve seat 8 must be concentric with the guideway 14 so that the valve closing body 12 can lift off or seal quickly from the valve seat 8 when opening and closing and so that the friction path between valve closing body 12 and valve seat 8 is as short as possible.
  • the guide ring 7 shown here is a stamped or embossed, internally ground steel ring with a rectangular cross section in radial section.
  • An outer surface 20 of the nozzle 5 may be slightly eccentric to the guide cylinder 7. This has no adverse effect due to the length of the valve closing member 10 and the spherical shape of the valve closing body 12.
  • the valve closing member 10 may be tilted relative to the valve seat, but not axially offset.
  • the swirl grooves 16 not only allow a fuel flow past the valve closing body 10, but they also cause the injected fuel to swirl and improve the fuel spray pattern.
  • the guide ring 7 can be produced in sheet metal stamping in a particularly cost-effective manner.
  • FIG. 3 shows a further exemplary embodiment of the invention with a nozzle 35 which carries a guide ring 37 made of stamped sheet steel in a longitudinal bore 43 at an axial distance from the valve seat 38 by means of a welded connection 32.
  • this has an elongated S-shaped or rune-like profile.
  • the region of the larger diameter, that is to say the upper part of the guide ring 37, is seated at a radial distance in the longitudinal bore 43, held by the welded connection 32.
  • the fuel swirl openings 37 in the lower part of the guide ring 37 are flow-guiding, swirling swirl flaps 46 made of a hollow cylindrical guide track 44 of the guide ring 37 is formed. This can be done in the area of the guide track 44 by cutting and bending flow areas.
  • a nozzle 55 carries, by means of a welded connection 52, a guide ring 57 axially spaced apart from the valve seat 58 and the outlet opening 59.
  • swirl bores 66 are formed in the guide ring 57 obliquely to the axis of the valve seat body 55.
  • the guide ring 57 can consist of both solid steel and sheet metal.
  • a nozzle 75 carries a guide ring 77 by means of a welded connection 72 in the form of several weld spots. This is made, for example, of spirally wound wire. The spaces between the turns of the wire serve as a fuel swirl opening.
  • a hollow cylindrical guide track 84 is described by the rib-like protruding winding of the guide ring 77 and marked by a chain line. Due to an elongated design of the area of the winding pointing inside the guide ring 77, the guide track 84 assumes a flat, cylindrical shape, so that, as in the other exemplary embodiments, the valve closing body 12 is tightly enclosed over its entire stroke.
  • the guide ring 77 is seated in the longitudinal bore 83 at an axial distance from the valve seat 78.
  • An exemplary embodiment of the invention relates to a valve seat body which, via a welded connection, carries a guide ring which is covered with bristles pointing inwards.
  • the guide ring can also consist of porous, sponge-like or lattice or sieve-like material.
  • the assembly in all three exemplary embodiments takes place in the following, basically the same way: an adjusting ball, the diameter of which is slightly larger than that of the valve closing body 12, is pushed through the guide ring and pressed onto the valve seat. In this position, the guide ring is welded to the nozzle in the longitudinal bore under slight axial, position-securing pressure. A high-precision concentricity of the respective guideway to the corresponding valve seat is thus established and ensured.

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)
EP90915088A 1989-12-08 1990-10-25 Elektromagnetisch betätigbares kraftstoffeinspritzventil Expired - Lifetime EP0504147B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3940585 1989-12-08
DE3940585A DE3940585A1 (de) 1989-12-08 1989-12-08 Elektromagnetisch betaetigbares kraftstoffeinspritzventil
PCT/DE1990/000814 WO1991009222A1 (de) 1989-12-08 1990-10-25 Elektromagnetisch betätigbares kraftstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP0504147A1 EP0504147A1 (de) 1992-09-23
EP0504147B1 true EP0504147B1 (de) 1994-09-07

Family

ID=6395063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90915088A Expired - Lifetime EP0504147B1 (de) 1989-12-08 1990-10-25 Elektromagnetisch betätigbares kraftstoffeinspritzventil

Country Status (9)

Country Link
EP (1) EP0504147B1 (ja)
JP (1) JP2839708B2 (ja)
KR (1) KR0172132B1 (ja)
CZ (1) CZ279377B6 (ja)
DE (2) DE3940585A1 (ja)
ES (1) ES2060200T3 (ja)
HU (1) HUT65264A (ja)
RU (1) RU2059867C1 (ja)
WO (1) WO1991009222A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5625946A (en) * 1995-05-19 1997-05-06 Siemens Automotive Corporation Armature guide for an electromechanical fuel injector and method of assembly
US5755386A (en) * 1995-12-26 1998-05-26 General Motors Corporation Fuel injector deep drawn valve guide
FR2744494B3 (fr) * 1996-02-01 1998-01-02 Peugeot Motocycles Sa Injecteur de carburant, notamment dans un moteur thermique de vehicule
DE19637103A1 (de) * 1996-09-12 1998-03-19 Bosch Gmbh Robert Ventil, insbesondere Brennstoffeinspritzventil
DE10050751B4 (de) 2000-10-13 2005-08-11 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10055513B4 (de) 2000-11-09 2006-03-09 Robert Bosch Gmbh Brennstoffeinspritzventil
JP2004108235A (ja) 2002-09-18 2004-04-08 Denso Corp 燃料噴射装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807052A1 (de) * 1978-02-18 1979-08-23 Bosch Gmbh Robert Elektromagnetisches kraftstoff- einspritzventil fuer brennkraftmaschinen
EP0042799A3 (en) * 1980-06-23 1982-01-13 The Bendix Corporation Electromagnetic fuel injector
DE3120160A1 (de) * 1981-05-21 1982-12-09 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil, insbesondere kraftstoffeinspritzventil fuer kraftstoffeinspritzan lagen
DE3878599T2 (de) * 1987-06-26 1993-09-23 Hitachi Ltd Elektromagnetisches kraftstoffeinspritzventil.
JP2628742B2 (ja) * 1989-03-10 1997-07-09 株式会社日立製作所 電磁式燃料噴射弁

Also Published As

Publication number Publication date
KR920703998A (ko) 1992-12-18
KR0172132B1 (ko) 1999-03-20
CZ279377B6 (cs) 1995-04-12
HU9201893D0 (en) 1992-09-28
RU2059867C1 (ru) 1996-05-10
WO1991009222A1 (de) 1991-06-27
ES2060200T3 (es) 1994-11-16
EP0504147A1 (de) 1992-09-23
HUT65264A (en) 1994-05-02
JPH05502491A (ja) 1993-04-28
DE3940585A1 (de) 1991-06-13
DE59007083D1 (de) 1994-10-13
CZ610190A3 (en) 1993-08-11
JP2839708B2 (ja) 1998-12-16

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