EP0826878B1 - Injecteur de combustible pour moteurs à combustion interne - Google Patents

Injecteur de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0826878B1
EP0826878B1 EP97110726A EP97110726A EP0826878B1 EP 0826878 B1 EP0826878 B1 EP 0826878B1 EP 97110726 A EP97110726 A EP 97110726A EP 97110726 A EP97110726 A EP 97110726A EP 0826878 B1 EP0826878 B1 EP 0826878B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve member
fuel injection
stroke
conical
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
EP97110726A
Other languages
German (de)
English (en)
Other versions
EP0826878A1 (fr
Inventor
Detlev Dr. Potz
Theodor Duetsch
Guenter Lewentz
Uwe Gordon
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 EP0826878A1 publication Critical patent/EP0826878A1/fr
Application granted granted Critical
Publication of EP0826878B1 publication Critical patent/EP0826878B1/fr
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
    • 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
    • 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
    • F02M61/042—The valves being provided with fuel passages
    • F02M61/045—The valves being provided with fuel discharge orifices
    • 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

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out.
  • a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out.
  • Such a known from DE-OS 42 28 359 A1 Fuel injection valve has a valve body with a axial bore in which a piston-shaped valve member is led to control an injection cross section by the high fuel pressure against the force of one Closing spring can be moved outwards.
  • the valve member has one at the end of the combustion chamber Bore of the valve body protruding closing head, the one Forms valve closing member and the valve body thereof facing a valve sealing surface is arranged with the closing head with one on the combustion chamber side End face of the valve body arranged valve seat surface interacts.
  • At least one Injection opening on the valve member at the level of the closing head provided by a between the valve member and the Bore formed pressure chamber.
  • the exit opening the injection opening is in the closed position of the Valve member covered by the valve body and is only in Course of the outward opening stroke of the Valve member released by dipping out of the hole.
  • valve member With its end facing away from the closing head and away from the combustion chamber the valve member protrudes into a spring chamber which is axially aligned is formed with the valve body clamped holding body.
  • the valve member points to its distant combustion chamber Shaft a spring plate between, and one on Valve body attached to the housing-fixed stop Closing spring is clamped.
  • the fuel injection takes place at the beginning of the High pressure fuel supply in the pressure chamber of the Injector, the high pressure fuel that Valve member acted in the opening direction and counter the restoring force of the closing spring from the valve seat stands out on the outside. After a short Opening stroke of the valve member the injection opening turned on so that the fuel in the combustion chamber too supplying internal combustion engine is injected.
  • the maximum opening stroke movement of the valve member is thereby by the creation of a federal government on Valve member formed contact surface on a fixed stroke stop limited, on the location itself the maximum opening stroke can be set.
  • the known fuel injection valve has the Disadvantage on that at the contact surfaces of the stroke stop very high due to the strong valve link stroke delay Surface pressure forces at the contact points and, conditionally due to the inertial forces of the valve member, very high dynamic tensile forces occur on the valve member that breakage of the valve member and thus total failure of the entire fuel injection system.
  • the fuel injector according to the invention for Internal combustion engines with the characteristic features of the Claim 1 has the advantage that means a conical formation of the contact surfaces of the Ventilgliedhubanschlag the supporting cross section of the Valve member can be increased without losing the Surface pressure on the contact surface of the valve member to increase disproportionately. To do this point the stationary conical stroke stop surface and the one with this cooperating conical valve member contact surface same angle of inclination to the largest possible To provide force application area.
  • this cross-sectional transition is in advantageously rounded with a large radius educated.
  • the conical stroke stop surface is advantageously on the end face of a stop ring provided, the Transition from the conical stop surface to the cylindrical one Inner wall over different angles of inclination of the oblique Inner wall surfaces are made.
  • the stop ring is made of two half shells formed in the installed state by a support ring are enclosed, which fixes the half-shells in their position and secures, the support ring also by the conical force application surface due to spreading forces the half shells.
  • the two half-shells will be more advantageous Way by cutting a finished ring produced, alternatively also a division into three or more stop ring segments is possible.
  • Fuel injection valve for internal combustion engines is in of the drawing and is shown in the following Description explained in more detail.
  • FIG. 1 shows a known one Fuel injection valve in a longitudinal section
  • FIG. 2 the inventive design of the stroke stop in one Detail from a fuel injection valve according to FIG. 1
  • FIG. 3 shows an enlarged partial illustration of the Inner cross section of a half shell of the stroke stop ring of Figure 2.
  • Fuel injector for internal combustion engines has a valve body 1, which by means of a union nut 3 is axially clamped against a valve holding body 5.
  • the one with its free end in the combustion chamber of the internal combustion engine projecting valve body 1 has an axial guide bore 7 on, in which a piston-shaped valve member 8 axially is slidably mounted on the lower, in the End of the combustion chamber projecting a valve closing head 9 is arranged is.
  • This valve closing head 9 has one of the valve body 1 facing conical valve sealing surface 11 with a corresponding conical valve seat 13 on the Front side of the valve body on the combustion chamber side 1 interacts.
  • the protruding into the guide bore 7 radial with respect to the part having the sealing surface 11 offset section of the valve closing head 9 is as Piston spool designed with its distant combustion chamber Ring face 15 a pressure chamber 17 within the Guide bore 7 limited, of which a variety of axial inlet channels 19 in the valve closing head 9, of which a radial injection opening 21 leads away.
  • the outlet openings of the injection openings 21 arranged so that when the injector is closed, with valve member 8 resting against valve seat 13, from the wall the guide hole 7 are closed and only in the course the outward opening stroke of the valve member 8 Dive out of the overlap with the valve body 1.
  • the high-pressure fuel supply takes place in the pressure chamber 17 via a high-pressure channel 23, which the valve body 1 and the Valve holder body 5 penetrates axially and to the one of a fuel injection pump, not shown Injection line is connected.
  • Valve member 8 With its valve member facing away from the combustion chamber, this protrudes Valve member 8 provided in a valve holding body 5 Spring chamber 25, in which the valve member 8 in Closing direction towards the valve seat 13 Valve spring 27 is inserted. It is on the far side of the combustion A spring plate 29 is arranged at the end of the valve member 8, between the and a housing-fixed ring insert 31 die Valve spring 27 is clamped.
  • the ring insert 31 lies with its spring facing away End face on a stop ring 33, with its other face on the face of the Valve body 1 is applied.
  • the inside diameter of the Stop ring 33 formed smaller than that Inner diameter of the ring insert 31, so that on the Contact surface between ring insert 31 and stop ring 33 an annular stroke stop surface 35 is formed. With this stroke stop surface 35 acts to limit the after outward valve member opening stroke movement Contact surface 37 together on the valve member 8, the one combustion chamber side shoulder of a collar 39 am Valve member 8 is formed and the closed Injector one, the maximum opening stroke has a defining distance from the stroke stop surface 35.
  • the stop ring 33 is shown in FIG Embodiment according to the invention from two half shells 41 formed by cutting a finished Stop ring are made.
  • a support ring 43 is used, which is also on the Front surface of the valve body 1 distant from the combustion chamber.
  • FIG. 3 shows the inner wall course of the half-shells 41 shown enlarged, the conical stroke stop surface 35 over differently inclined conical surfaces 45 in the cylindrical inner wall area 47 merges.
  • the fuel injection valve according to the invention works in the following way.
  • the valve spring 27 holds the valve member 8 with its sealing surface 11 in contact with the valve seat surface 13 on the valve body 1, the injection openings 21 being covered by the wall of the guide bore 7, so that the injector is closed.
  • the maximum opening stroke movement of the valve member 8 is thereby by the contact of the valve member contact surface 37 on the fixed stroke stop surface 35, being limited by the conical formation of these two contact surfaces of the load-bearing cross section on the valve member 8, without an increase the surface pressure can be increased such that Fractures of the valve member 8 due to the hard impact can be safely avoided at the stroke stop.

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

Claims (7)

  1. Injecteur de carburant pour un moteur à combustion interne, comportant un organe d'obturation (8) guidé en coulissement axial dans un perçage (7) d'un corps d'injecteur (1), l'extrémité de cet organe, du côté de la chambre de combustion, ayant une surface d'étanchéité de soupape (11) qui coopère avec une surface formant siège de soupape (13) du corps d'injecteur (1) pour commander la section de l'ouverture d'injection, ainsi qu'une surface de butée de course (35) fixe vis-à-vis regard du corps de l'injecteur (1), que l'organe d'obturation (8) vient frapper par sa surface d'appui (37), après avoir parcouru une course d'ouverture maximale dirigée vers l'extérieur,
    caractérisé en ce que
    la surface de butée fixe (35) et la surface d'appui (37) de l'organe d'obturation qui coopère avec cette surface de butée sont de forme conique.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le passage entre la surface d'appui conique (37) de l'organe d'obturation (8) et sa tige cylindrique est bombé avec un grand rayon de courbure.
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la surface de butée de course conique (35) rejoint, par différents angles d'inclinaison, un diamètre intérieur (47) cylindrique.
  4. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la surface de butée de course (35) fixe est prévue sur les faces frontales de deux demi-coquilles (41) formant un anneau de butée (33), fermé, ces demi-coquilles étant entourées par un anneau d'appui (43).
  5. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la surface d'appui conique (37) de l'organe d'obturation (8) est réalisée comme une collerette annulaire (39) au niveau d'un passage de section de la tige de l'organe d'obturation formant un épaulement de poussée.
  6. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'organe d'obturation (8) comporte, à son extrémité pénétrant dans la chambre de combustion, une tête d'obturation (9) sortant du perçage (7) du corps (1) de l'injecteur, recevant la surface d'étanchéité de soupape (11) et comportant au moins un orifice d'éjection (21) qui, lorsque l'organe d'obturation (8) est appliqué contre le siège de soupape (13), est fermé par la paroi du perçage (7), et qui lors de la course d'ouverture vers l'extérieur de l'organe d'obturation, est dégagé de son chevauchement par le perçage (7).
  7. Injecteur de carburant selon la revendication 4,
    caractérisé en ce que
    les deux demi-coquilles (41) sont réalisées en coupant un anneau de butée (33) fermé, dont l'usinage est terminé.
EP97110726A 1996-08-28 1997-07-01 Injecteur de combustible pour moteurs à combustion interne Expired - Lifetime EP0826878B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19634716 1996-08-28
DE19634716A DE19634716A1 (de) 1996-08-28 1996-08-28 Kraftstoffeinspritzventil für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0826878A1 EP0826878A1 (fr) 1998-03-04
EP0826878B1 true EP0826878B1 (fr) 2002-05-15

Family

ID=7803891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110726A Expired - Lifetime EP0826878B1 (fr) 1996-08-28 1997-07-01 Injecteur de combustible pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0826878B1 (fr)
JP (1) JPH1089196A (fr)
DE (2) DE19634716A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753162A1 (de) * 1997-11-29 1999-06-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
CN110344979B (zh) * 2019-07-19 2020-12-25 北京中康增材科技有限公司 一种喷油器油道的设计方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750183C (de) * 1941-12-03 1944-12-16 Insbesondere fuer Brennkraftmaschinen bestimmtes, fluessigkeitsgesteuertes Einspritzventil
US2756106A (en) * 1954-03-18 1956-07-24 Schenk Rudolf Fuel injection valve
US5522550A (en) 1992-06-10 1996-06-04 Robert Bosch Gmbh Injection nozzle for internal combustion engines

Also Published As

Publication number Publication date
DE19634716A1 (de) 1998-03-05
DE59707262D1 (de) 2002-06-20
JPH1089196A (ja) 1998-04-07
EP0826878A1 (fr) 1998-03-04

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