EP0927303A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP0927303A1
EP0927303A1 EP98928157A EP98928157A EP0927303A1 EP 0927303 A1 EP0927303 A1 EP 0927303A1 EP 98928157 A EP98928157 A EP 98928157A EP 98928157 A EP98928157 A EP 98928157A EP 0927303 A1 EP0927303 A1 EP 0927303A1
Authority
EP
European Patent Office
Prior art keywords
fuel
valve seat
fuel injection
valve
injection valve
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.)
Granted
Application number
EP98928157A
Other languages
German (de)
English (en)
Other versions
EP0927303B1 (fr
Inventor
Jochen Riefenstahl
Henning Teiwes
Gottfried Flik
Ottmar Martin
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 EP0927303A1 publication Critical patent/EP0927303A1/fr
Application granted granted Critical
Publication of EP0927303B1 publication Critical patent/EP0927303B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of 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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim. It is already known from DE-PS 49 47 40 a fuel injection valve in which a valve closing body connected to a valve needle interacts with a valve seat body to form a valve seat. To guide the fuel, a substantially axially extending fuel supply line is provided in a nozzle body, which leads into a fuel channel running in the radial direction in the valve seat body. The fuel channel opens into a spray opening in the area of the valve seat.
  • a newer design of a fuel injection valve for the direct injection of fuel into a cylinder of an internal combustion engine goes, for. B. from DE 196 00 403 AI.
  • the amount of fuel metered by the fuel injection valves is predetermined by the valve lift of the fuel injection valves.
  • the valve lift of the fuel injection valves is, however, only relatively complex in the assembled state of the fuel injection valve and can be changed within narrow limits. The fine adjustment of the metered amount of fuel is therefore relatively complex in the known fuel injection valves.
  • the fuel distribution within the fuel jet sprayed by the known fuel injection valves is largely radially symmetrical.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that an exact adjustment of the amount of fuel metered by the fuel injector is possible by specifically changing the opening cross section of a throttle point of the one fuel channel or the plurality of fuel channels in the fully assembled state of the fuel injector.
  • the amount of fuel metered by the fuel injection valves according to the invention can be adjusted fully automatically in a relatively short time with relatively little effort. The manufacturing costs are therefore significantly reduced.
  • the opening cross sections of the throttle points assigned to the fuel channels can be changed independently of one another.
  • this has the advantage that the fuel distribution in the fuel steel sprayed from the fuel injection valve can be set asymmetrically.
  • the opening cross section of the fuel channels arranged there has to be increased accordingly, while in an area with a desired lowered fuel density the opening cross section of the fuel channels arranged there has to be dimensioned accordingly smaller. Due to the resulting asymmetrical design of the fuel jet, the fuel distribution can be adapted to the installation geometry and the special design of the internal combustion engine, e.g.
  • the amount of fuel impinging on wall areas of the cylinder or the intake manifold can be reduced, which manifests itself in improved exhaust gas values.
  • That the fuel distribution within the fuel jet can still be changed in the fully assembled state of the fuel injector is particularly advantageous since the Installation position of the fuel injection valve on the internal combustion engine and the special geometric shape of the components of the internal combustion engine can vary considerably depending on the type of internal combustion engine, ie from vehicle type to vehicle type.
  • the throttle point can be formed in a particularly advantageous and simple manner in that a nozzle body surrounding the valve seat body in this area from the outside, for. B. is plastically deformable by means of a bolt element and constricts the fuel channel according to its deformation.
  • the opening cross-section of the throttling point can advantageously be set particularly easily by an automatic machine.
  • a manipulator that can be inserted into the fuel channel, the insertion depth of which defines the opening cross section of the throttle point of the assigned fuel channel. It is particularly advantageous in this development that the opening cross section of the throttle point can be both reduced and enlarged, which simplifies the adjustment process.
  • FIG. 1 shows an axial section through a first exemplary embodiment of a fuel injection valve according to the invention shown in excerpts
  • FIG. 2 shows an axial section through a second embodiment of a fuel injection valve according to the invention shown in excerpts.
  • FIG. 1 shows an axial section through a first exemplary embodiment of a fuel injector 1 designed according to the invention in a partial illustration. Only the spray-side end of the fuel injection valve 1 is shown.
  • a valve seat body 3 is arranged at the spray-side end thereof and is sealingly connected to the nozzle body 2 by means of a weld seam 4.
  • the valve seat body 3 is also essentially hollow-cylindrical, the outer diameter of the valve seat body 3 essentially having the inner diameter of the nozzle body 2 coincides, so that the valve seat body 3 is fitted into the inner opening 5 of the nozzle body 2.
  • the valve seat body 3 has a guide bore 7, which serves to guide a valve needle 8, concentrically with its longitudinal axis, which corresponds to the longitudinal axis 6 of the fuel injector 1.
  • the valve needle 8 is cylindrical and is formed in one piece with a valve closing body 9.
  • the valve needle 8 can, however, also be designed as a hollow cylinder or from a bent sheet metal part.
  • the valve closing body 9 has a conical valve closing surface 10 which interacts with a likewise conical valve seat surface 11 arranged on the spray-side end of the valve seat body 3 to form an externally closing valve seat 12.
  • the valve needle 8 and the valve closing body 9 connected to the valve needle 8 are along the longitudinal axis 6 by means of a z.
  • valve seat 12 opening outside is particularly for a fuel injector 1 for direct injection of fuels into a cylinder or Combustion chamber of an internal combustion engine is suitable, since the combustion pressure prevailing in the cylinder acts on the valve closing body 9 in the closing direction and does not lead to an unintentional opening of the fuel injection valve 1.
  • At least one fuel channel is provided in the valve seat body 3.
  • the fuel channel consists of a first section 20 running in the radial direction and a second section 21 connected to the first section 20 and running in the axial direction.
  • the first radial section 20 of the fuel channel 20, 21 is part of a through hole 22 which extends from the outer lateral surface 23 of the valve seat body 3 extends through this up to the guide bore 7.
  • the second, axial section 21 of the fuel channel 20, 21 is designed as a blind bore 31 in the exemplary embodiment.
  • the second section 21 of the fuel channel 20, 21 is a through hole and to close it on the spray-side end face 24 of the valve seat body 3 by means of a suitable closing body.
  • the first, radial section 20 of the fuel channel 20, 21 opens into an annular groove 25 formed on the valve needle 8 independently of the stroke position of the valve needle 8.
  • a manipulator 26 designed as a stepped cylinder in the exemplary embodiment can be inserted therein.
  • the manipulator 26 has a guide section 27 adapted to the diameter of the through bore 22 and a pin-like section 28 with a reduced diameter.
  • the opening cross section of the fuel channel 20, 21 is reduced the more, the deeper the manipulator 26 into the through hole 22 and thus into the
  • the manipulator 26 therefore forms a throttle point 29 with an adjustable opening cross section.
  • the opening cross section of this throttle point 29 can be varied without further ado even when the fuel injector 1 is in the fully assembled state.
  • the manipulator 26 in the exemplary embodiment is sealingly connected to the valve seat body 3 by means of a weld seam 30. As a result, the manipulator 26 is locked on the valve seat body 3 and at the same time prevents fuel from escaping from the through bore 22 to the outside.
  • a plurality of fuel channels 20, 21 are provided in the valve seat body 3, which, for. B. are preferably arranged uniformly distributed on a concentric pitch circle.
  • the throttling points 29 of the individual fuel channels 20, 21 can be adjusted independently of one another by their respective manipulator 26.
  • a radially asymmetrical fuel distribution can be generated in the fuel jet sprayed from the fuel injection valve 1, since the fuel distribution in the circumferential groove 25 of the valve needle 8 is uneven due to the differently throttled supply of the fuel via the differently throttled fuel channels 20, 21.
  • Such an asymmetrical fuel distribution in the sprayed fuel jet is e.g. B. advantageous if the fuel content in the fuel-air mixture in the area of individual components, for. B. a spark plug, the intake or exhaust valves of the cylinder or the wall areas of the cylinder or the intake manifold should be reduced. In this way, the combustion of the internal combustion engine can be optimized and the exhaust gas values can be significantly improved.
  • FIG. 2 shows a second exemplary embodiment of a fuel injector 1 according to the invention in a sectional, excerpted illustration. Elements which have already been described are provided with the same reference numerals, so that a repetitive description is unnecessary.
  • the first, radial section 20 of each fuel channel 20, 21 is also formed in the exemplary embodiment shown in FIG. 2 as a radial bore 44 which opens into the annular groove 25 of the valve needle 8.
  • 21 is designed as a groove 40, which is created by flattening 21 of the valve seat body 3.
  • the groove 40 is connected both to the inner opening 5 of the nozzle body 2 and to the first section 20 of the fuel channel 20, 21.
  • the throttle point 29 is not formed by a manipulator 26, but rather by plastically deforming the wall 41 of the nozzle body 2, which is relatively thin-walled in the region of the throttle point 29.
  • the deformation of the wall 41 can, for. B. take place by means of a bolt element 42 which penetrates into a recess 43 of the nozzle body 2 and engages on the thin-walled wall 41 of the nozzle body 2.
  • the amount of fuel metered by the fuel injector 1 can therefore be fully assembled
  • State of the fuel injector 1 can be set fully automatically in such a way that the throttle point 29 is gradually narrowed until that of the
  • Fuel injection valve 1 to be metered amount of fuel is reached.
  • valve lift does not necessarily have to be changed in order to adjust the amount of fuel metered by the fuel injection valve 1.
  • a plurality of circumferentially distributed grooves 40 are provided on the valve seat body 3, each of which is connected to the annular groove 25 of the valve needle 8 via a radial bore 44.
  • the individual opening cross sections of the throttle points 29 of the individual grooves 40 can be set independently of one another. This can be done in a machine either in succession by rotating the fuel injection valve 1 about its longitudinal axis 6 and a single bolt element 42 penetrating in time in all the recesses 43, or at the same time by a plurality of bolt elements 42 provided on the machine, which simultaneously set all the throttle points 29.
  • the measured total amount of fuel from the fuel injector can first be adjusted by shifting the Valve seat body 3 and thus adjusting the valve lift can be adjusted and the weld 4 applied to lock the valve seat body 3. Subsequently or possibly also beforehand, a radially asymmetrical fuel distribution can be set at each throttle point 29 by pressing the wall 41 of the nozzle body 2. Furthermore, a fine adjustment of the amount of fuel metered by the fuel injection valve 1 can take place at the same time.
  • the axial grooves 40 can also be milled into the valve seat body 3. It is also possible to use other restricted throttling methods, such as those used for. B. are known from shut-off valves. It is also not absolutely necessary to form the fuel channel 20, 21 or the fuel channels 20, 21 in or on the valve seat body 3. The fuel channels 20, 21 could at least in sections, for. B. can also be arranged in or on the nozzle body 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Soupape d'injection de carburant (1), en particulier pour systèmes d'injection de carburant dans des moteurs à combustion interne, présentant un corps d'obturation de soupape (9) connecté à un pointeau de soupape (8), et un corps de siège de soupape (3). Sur le corps d'obturation (9) est prévue une surface d'obturation de soupape (10) coopérant avec une surface (11) appartenant à un siège de soupape (12) formée sur un corps de siège de soupape (3). En outre, la soupape d'injection (1) présente au moins un conduit de carburant (20, 21) prévu dans la zone du corps du siège (3) en amont du siège de soupape (12), pour l'amenée de carburant audit siège de soupape (12). L'invention est caractérisée en ce que dans chaque conduit de carburant (20, 21) est prévu un point d'étranglement (29) dont la section transversale d'ouverture peut être modifiée de l'extérieur de ladite soupape d'injection de carburant (1).
EP98928157A 1997-06-14 1998-04-08 Soupape d'injection de carburant Expired - Lifetime EP0927303B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19725198 1997-06-14
DE19725198A DE19725198A1 (de) 1997-06-14 1997-06-14 Brennstoffeinspritzventil
PCT/DE1998/000985 WO1998058168A1 (fr) 1997-06-14 1998-04-08 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0927303A1 true EP0927303A1 (fr) 1999-07-07
EP0927303B1 EP0927303B1 (fr) 2002-12-11

Family

ID=7832484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98928157A Expired - Lifetime EP0927303B1 (fr) 1997-06-14 1998-04-08 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US6098598A (fr)
EP (1) EP0927303B1 (fr)
JP (1) JP2000517029A (fr)
KR (1) KR20000068103A (fr)
DE (2) DE19725198A1 (fr)
WO (1) WO1998058168A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2021892B1 (fr) 2006-04-27 2013-02-20 Sko Flo Industries, Inc. Soupape de regulation de debit
US7395708B2 (en) * 2006-04-28 2008-07-08 Skoflo Industries, Inc. Flow measuring apparatus including a piston movable in the flow barrel
US7963464B2 (en) * 2008-01-23 2011-06-21 Caterpillar Inc. Fuel injector and method of assembly therefor
DE102009045513A1 (de) 2009-10-09 2011-04-14 Robert Bosch Gmbh Fahrzeugnavigationssystem und Verfahren zum Betreiben des Fahrzeugnavigationssystems
EP2336543A3 (fr) * 2009-12-21 2013-07-03 Robert Bosch GmbH Soupape d'injection de carburant pour moteurs à combustion interne

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE494740C (de) 1926-04-11 1930-03-27 Fried Krupp Germaniawerft Akt Brennstoffventil fuer Dieselmaschinen mit Lufteinblasung
US3343798A (en) * 1965-07-20 1967-09-26 Gen Motors Corp Injector clamp and index device
US3361353A (en) * 1965-10-20 1968-01-02 Mitchell W. Millman Method and apparatus for injection of liquid fuels
JPS584049Y2 (ja) * 1974-09-04 1983-01-24 萬世工業株式会社 ガスリユウリヨウチヨウセツシ ノ ダツラクボウシソウチ
US4046322A (en) * 1976-05-21 1977-09-06 General Motors Corporation Fuel injection nozzle assembly with stretch element
GB8319284D0 (en) * 1983-07-16 1983-08-17 Lucas Ind Plc Fuel injection nozzles
DE4123787A1 (de) * 1991-07-18 1993-01-21 Bosch Gmbh Robert Verfahren zur einstellung eines brennstoffeinspritzventils und brennstoffeinspritzventil
DE4431128A1 (de) * 1994-09-01 1996-03-07 Bosch Gmbh Robert Verfahren zur Einstellung eines Ventils und Ventil
JPH08200182A (ja) * 1995-01-25 1996-08-06 Zexel Corp 電磁式燃料噴射弁およびその取付け構造
DE19640782A1 (de) * 1996-10-02 1998-04-09 Bosch Gmbh Robert Ventil und Verfahren zur Herstellung eines Ventiles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9858168A1 *

Also Published As

Publication number Publication date
KR20000068103A (ko) 2000-11-25
EP0927303B1 (fr) 2002-12-11
JP2000517029A (ja) 2000-12-19
US6098598A (en) 2000-08-08
DE19725198A1 (de) 1998-12-17
DE59806618D1 (de) 2003-01-23
WO1998058168A1 (fr) 1998-12-23

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