EP1198672B1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP1198672B1
EP1198672B1 EP01953120A EP01953120A EP1198672B1 EP 1198672 B1 EP1198672 B1 EP 1198672B1 EP 01953120 A EP01953120 A EP 01953120A EP 01953120 A EP01953120 A EP 01953120A EP 1198672 B1 EP1198672 B1 EP 1198672B1
Authority
EP
European Patent Office
Prior art keywords
valve
conical surface
fuel injection
valve member
annular groove
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
EP01953120A
Other languages
German (de)
English (en)
Other versions
EP1198672A1 (fr
Inventor
Rainer Haeberer
Markus Ohnmacht
Wilhelm Christ
Ralf Maier
Stefan Haug
Wolfgang Fleiner
Markus Rueckle
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 EP1198672A1 publication Critical patent/EP1198672A1/fr
Application granted granted Critical
Publication of EP1198672B1 publication Critical patent/EP1198672B1/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
    • 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
    • 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
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M61/047—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 being formed by deformable nozzle parts, e.g. flexible plates or discs 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped

Definitions

  • the invention is based on a fuel injection valve for internal combustion engines, preferably self-igniting internal combustion engines, according to the preamble of claim 1.
  • a fuel injection valve for internal combustion engines, preferably self-igniting internal combustion engines, according to the preamble of claim 1.
  • Such a fuel injection valve is known from published patent application WO 96/19661.
  • a blind bore is formed in a valve body, in which a valve member is guided.
  • the valve member is surrounded on its combustion chamber-side section by a pressure chamber which can be filled with fuel under high pressure.
  • a conical valve seat is formed on the bottom surface of the blind bore facing the combustion chamber.
  • at least one injection opening is arranged on the bottom surface, which connects the bore to the combustion chamber. In the closed position, the valve member comes into contact with the valve member tip on the valve seat and thus closes the injection openings against the pressure chamber.
  • valve member tip two conical surfaces are arranged, at the transition of which a circumferential annular groove is formed which defines the effective seat diameter of the valve member and has the effect that the opening pressure of the fuel in the pressure chamber does not change during operation.
  • the injection orifices, towards which the valve member is unsecured, are covered by the valve member at the beginning of the opening stroke movement, so that little or no fuel can flow to them.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that in the area of the injection openings on the second conical surface of the valve member tip, a further circumferential annular groove is formed, which already flows to the fuel flowing from the pressure chamber to the injection openings at the beginning of the opening stroke movement to all Injection openings distributed. If, during the opening stroke movement, the valve member is misaligned towards an injection opening, part of the fuel flowing to the other injection openings is diverted into a tangential flow through the additional annular groove and thus flows to this injection opening.
  • longitudinal grooves are formed in the conical surface between the annular groove and the additional annular groove. With these longitudinal grooves, the fuel is distributed more evenly and quickly across all injection openings when the valve element is misaligned.
  • the longitudinal grooves are inclined to the surface lines of the conical surface arranged between the annular groove and the additional annular groove. This results in a tangential fuel flow in the additional annular groove around the valve member in the area of the injection openings, which additionally supports a uniform distribution of the fuel over the bin injection openings.
  • Fuel injection valve are shown in the drawing. 1 shows a fuel injection valve in partial longitudinal section
  • Figure 2 is an enlarged view 1 in the area of the valve seat
  • the figures 3, 4, 5 and 6 the same detail as Figure 2 of other embodiments.
  • FIG. 1 a longitudinal section of a fuel injection valve is shown.
  • a bore 3 is arranged in a valve body 1, which is designed as a blind bore and the closed end of which faces the combustion chamber.
  • a conical valve seat 9 is formed on the bottom surface of the bore 3 and at least one injection opening 11, which connects the bore 3 to the combustion chamber.
  • a valve member 5 is arranged in the bore 3 and is sealingly guided in the bore in a section 105 facing away from the combustion chamber.
  • the valve member 5 tapers towards the combustion chamber, forming a pressure shoulder 13, and merges into a valve member shaft 205.
  • the combustion chamber end of the valve member 5 forms a valve member tip 7 which adjoins the valve member shaft 205 and which tapers further towards the combustion chamber.
  • the pressure shoulder 13 of the valve member 5 is arranged in a pressure chamber 19 formed in the valve body 1 and surrounding the valve member 5, which continues into the combustion chamber as an annular channel surrounding the valve member 5 and extends as far as the valve seat 9.
  • the pressure chamber 19 can be filled with fuel under high pressure via an inlet channel 25 formed in the valve body 1.
  • the valve member 5 is pressed against the valve seat 9 with the lateral surface of the valve member tip 7 by a closing force which acts on the end of the valve member 5 facing away from the combustion chamber.
  • the outer surface of the valve member tip 7 cooperates with the valve seat 9 so that the injection openings 11 are closed against the pressure chamber 19. In this closed position of the valve member 5, the pressure shoulder 13 and part of the valve member tip 7 are acted upon by the fuel pressure of the pressure chamber 19.
  • the closing force is generated by a device that is in a valve holding body, not shown in the drawing is arranged in the installed position of the fuel injector against the end of the valve body facing away from the combustion chamber 1 is tense.
  • This device can, for example be a preloaded spring, at least indirectly acts on the valve member 5. It can also be provided that several springs are arranged in the valve holding body the closing force depends on the stroke of the valve member 5 individually or generate together.
  • the closing force can also be generated hydraulically be in which, for example, an actuator hydraulic moves at least indirectly onto the valve member 5 acts and acts on it in the closed position.
  • the opening stroke movement of the valve member 5 is thereby initiated that the fuel pressure in the pressure chamber 19 through Fuel supply from the inlet channel 25 increases.
  • the hydraulic force increases on the pressure shoulder 13 and the part of the valve member tip acted upon by the fuel 7, the resulting force on the valve member 5 causes in the axial direction. exceeds this resulting Force the closing force, the valve member 5 lifts from the valve seat 9 and fuel can from the pressure chamber 19th past the valve member tip 7 to the injection openings 11 flow and from there into the combustion chamber.
  • the fuel injector is in the range of Valve element tip 7 in the closed position of valve element 5 shown enlarged.
  • the valve seat 9 is a conical one Surface with a cone angle ⁇ , which is preferably 50 to Is 70 degrees.
  • the valve seat goes at the combustion chamber end 9 for manufacturing reasons in a bulge 48.
  • At least one injection opening 11 is formed in the valve seat 9, the perpendicular to the valve sealing surface 9 or too this runs inclined. If there are several injection openings 11 provided, these are in accordance with the supply Combustion chamber of the internal combustion engine preferably evenly distributed over the circumference of the valve body 1.
  • the injection ports 11 can, for example, in a common Radial plane to the axis of the valve member 5 are on several radial planes can be distributed or in one to the axis of the valve member 5 are inclined plane.
  • the valve member stem 205 merges into the valve member tip 7 at its combustion chamber end, forming an intermediate cone surface 28. It can also be provided that the intermediate cone surface 28 is omitted and the diameter of the valve member stem 205 corresponds to that of the base surface of the valve member tip 7.
  • a first cone surface 30 is formed on the valve member tip 7, which adjoins the valve member shaft 205 and has a cone angle ⁇ which is smaller than the cone angle ⁇ of the valve seat 9. Facing the combustion chamber, the first conical surface 30 is adjoined by a second conical surface 32 which has a conical angle ⁇ which is greater than the conical angle ⁇ of the valve seat 9.
  • a difference angle ⁇ 1 is thus formed between the first cone surface 30 and the valve seat 9 and a difference angle ⁇ 2 between the second cone surface 32 and the valve seat 9.
  • the difference angles ⁇ 1 , ⁇ 2 are preferably less than 1.5 degrees.
  • the valve member 5 is flattened to form an end face 52 which is arranged inside the bulge 48 in the closed position of the valve member 5.
  • the first groove edge 38 located upstream with respect to the fuel flow to the injection openings lies on the first cone surface 30, while the second groove edge 39 located downstream lies on the second cone surface 32.
  • the first groove edge 38 comes into contact with the valve seat 9 and seals the injection openings 11 from the pressure chamber 19. Due to the closing force on the valve member 5 and the associated elastic deformation of the first groove edge 38 and the preferably small difference angle ⁇ 1 , ⁇ 2 , the second groove edge 39 also comes into contact with the valve seat 9 in the closed position of the valve member 5.
  • An additional annular groove 42 is formed on the second cone surface 32. It is arranged so that it covers the injection openings 11 in the closed position of the valve member 5.
  • the additional annular groove 42 has a cross section, which is preferably greater than or equal to the cross section of an injection opening 11, in order to enable an unthrottled fuel flow in the tangential direction in the additional annular groove 42 to the injection openings 11.
  • the cross-sectional shape can be in the form of a circular arc or can also have any other shape, for example a polygon or an elliptical arc shape.
  • the additional annular groove 42 is also arranged in such a radial plane. If, on the other hand, the injection openings 11 are arranged in a plane inclined to the radial plane, the additional annular groove 42 can also run accordingly in an inclined plane in order to cover all the injection openings 11 in the closed position.
  • the operation of the additional annular groove 42 is like follows: Lifts the valve member 5 by the hydraulic force from the valve seat 9, it can happen that the valve member 5 with respect to the axis of the bore 3 on the valve seat 9 is roofed to an injection opening 11. The fuel flow from the pressure chamber 19 to this injection opening 11 is then only possible to a limited extent, while the rest Injection openings 11 through fuel flow at the valve member tip 7 be supplied with fuel.
  • the additional annular groove 42 becomes part of the fuel into a tangential flow through the additional Ring groove 42 redirected so that the injection opening 11 on which the valve member 5 is too bad, from the beginning of the Sufficient opening stroke movement of fuel flows.
  • FIG. 3 shows a further exemplary embodiment of the fuel injection valve according to the invention.
  • the structure corresponds exactly to that shown in FIG. 2, but here longitudinal grooves 55 are arranged on the conical surface formed between the annular groove 35 and the additional annular groove 42, which connect the two annular grooves 35, 42 to one another.
  • the longitudinal grooves 55 run along surface lines of the conical surface formed between the ring grooves 35, 42.
  • These longitudinal grooves 55 provide a good inflow of fuel into the additional annular groove 42, particularly when the injection valve is only slightly open at the start of the opening stroke movement. If provision is made to arrange a plurality of longitudinal grooves 55 on the valve member tip 7, these are preferably distributed uniformly over the circumference of the valve member tip 7.
  • one or more longitudinal grooves 55 can also be made for one or more longitudinal grooves 55 to be inclined to the surface lines of the conical surface formed between the annular grooves 35, 42. As a result, the fuel flowing through the longitudinal grooves 55 into the additional annular groove 42 is given a tangential speed component and is rapidly distributed to all injection openings 11.
  • FIG 4 is another embodiment of an inventive Fuel injector shown.
  • the first Edge 38 of the additional annular groove 42 lies in the closed position the valve member 5 on the injection openings 11, so that the conical surface lying between the annular grooves 35, 42 partially covers the injection openings 11.
  • FIG. 6 shows a fuel injection valve according to the invention shown, in which the additional annular groove 42 clearly wider than the diameter of the injection openings 11 is formed and in the closed position of the valve member 5 the injection openings 11 are completely covered. That is it possible to cover several injection openings 11 that are not all on the same radial plane with respect to the longitudinal axis 50 of the valve member 5, but still from the additional Ring groove 42 covered in the closed position of the valve member 5 become.

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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 (12)

  1. Injecteur de carburant pour moteurs à combustion interne, comprenant un corps de soupape (1), avec un alésage (3) dont l'extrémité côté chambre de combustion comporte un siège de soupape conique (9), au moins deux ouvertures d'injection (11) qui relie l'alésage (3) à la chambre de combustion, et comprenant un organe de soupape (5) guidé dans l'alésage (3), qui peut être déplacé dans le sens axial en appliquant du carburant sous pression sur une surface de pression (13) prévue sur l'organe de soupape (5) contre une force de fermeture dirigée sur le siège de soupape (9), et qui présente une tige d'organe de soupape (205) en regard du siège de soupape (9), avec entre celle-ci et la paroi de l'alésage (3) une chambre de pression (19) pouvant être remplie de carburant l'organe de soupape (5) présentant à son extrémité côté chambre de combustion une pointe d'organe de soupape (7), comportant une première surface conique (30) et une deuxième surface conique (32) qui prolonge côté chambre de combustion la première surface conique (30), l'angle conique (α) de la première surface conique (30) étant inférieur et l'angle conique (β) de la deuxième surface conique (32) étant supérieur à l'angle conique (γ) du siège de soupape (9), ainsi qu'une rainure annulaire (35) périphérique sur la pointe d'organe de soupape (7), dont le premier bord de rainure (38) se situe dans un plan radial par rapport à l'axe d'élément de soupape (5) et sur la première surface conique (30), et dont le deuxième bord de rainure (39) se situe dans un plan radial par rapport à l'axe de l'organe soupape (5) et sur la deuxième surface conique (32), le premier bord de rainure (38) de la rainure annulaire (35) formant un bord d'étanchéité qui, en position de fermeture d'un organe de soupape (5), vient en appui sur le siège de soupape (9) en amont du flux de carburant vers les ouvertures d'injection (11),
    caractérisé en ce que
    sur la deuxième surface conique (32) de la pointe d'organe de soupape (7) une rainure annulaire supplémentaire (42) recouvre du moins partiellement lés ouvertures d'injection (11) aussi bien en position de fermeture qu'en position d'ouverture de l'organe de soupape (5).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la section transversale de la rainure annulaire (42) est supérieure ou égale à la section transversale d'une ouverture d'injection (11).
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce qu'
    un premier angle différentiel (δ1) situé entre la première surface conique (30) et le siège de soupape (9) est inférieur à un deuxième angle différentiel (δ2) situé entre le siège de soupape (9) et la deuxième surface conique (32).
  4. Injecteur carburant selon la revendication 3,
    caractérisée en ce que
    le premier (δ1) et le deuxième (δ2) angles différentiels sont inférieurs à 1,5 degré.
  5. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'angle conique (γ) du siège de soupape (9) est compris entre 55 et 65 degrés, et est de préférence de 60 degrés.
  6. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les bords de rainure (44 ; 46) de la rainure annulaire supplémentaire (42) se situent dans des plans radiaux par rapport à l'axe d'organe de soupape (50) de un organe de soupape (5).
  7. Injecteur de carburant selon Tune quelconque des revendications 1 à 4,
    caractérisé en ce qu'
    en position de fermeture de un organe de soupape (5), la surface conique prolongeant le bord de rainure (46) de la rainure annulaire supplémentaire (42) opposé à la chambre de combustion recouvre partiellement les ouvertures d'injection (11).
  8. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les ouvertures d'injection (11) se situent dans un plan radial commun par rapport à l'axe d'organe de soupape (50).
  9. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les bords de rainure (44 ; 46) de la rainure annulaire supplémentaire (42) et les sorties des ouvertures d'injection se situent dans un plan incliné par rapport au plan radial de l'axe d'organe de soupape (50).
  10. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    sur la surface conique disposée entre la rainure annulaire (35) et la rainure annulaire supplémentaire (42) au moins une rainure longitudinale (55) est prévue reliant les deux rainures annulaires, s'étendant le long de génératrices de la deuxième surface conique (32).
  11. Injecteur de carburant selon la revendication 10,
    caractérisé en ce que
    plusieurs rainures longitudinales (55) sont prévues sur la deuxième surface conique (32), qui sont réparties régulièrement sur la circonférence.
  12. Iinjecteur carburant selon la revendication 10,
    caractérisé en ce que
    la totalité ou une partie des rainures longitudinales (55) s'étendent inclinées par rapport aux génératrices de la deuxième surface conique (32).
EP01953120A 2000-06-27 2001-06-27 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1198672B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10031264 2000-06-27
DE10031264A DE10031264A1 (de) 2000-06-27 2000-06-27 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/DE2001/002371 WO2002001066A1 (fr) 2000-06-27 2001-06-27 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1198672A1 EP1198672A1 (fr) 2002-04-24
EP1198672B1 true EP1198672B1 (fr) 2003-09-17

Family

ID=7646963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01953120A Expired - Lifetime EP1198672B1 (fr) 2000-06-27 2001-06-27 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (9)

Country Link
US (1) US6892965B2 (fr)
EP (1) EP1198672B1 (fr)
JP (1) JP2004502075A (fr)
KR (1) KR100772851B1 (fr)
CN (1) CN1262758C (fr)
BR (1) BR0106899A (fr)
DE (2) DE10031264A1 (fr)
PL (1) PL352634A1 (fr)
WO (1) WO2002001066A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006040288A1 (fr) 2004-10-14 2006-04-20 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion

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BR0106899A (pt) 2002-04-30
US20020179743A1 (en) 2002-12-05
DE10031264A1 (de) 2002-01-17
KR100772851B1 (ko) 2007-11-02
PL352634A1 (en) 2003-09-08
EP1198672A1 (fr) 2002-04-24
DE50100641D1 (de) 2003-10-23
US6892965B2 (en) 2005-05-17
KR20020027568A (ko) 2002-04-13
CN1262758C (zh) 2006-07-05
CN1383471A (zh) 2002-12-04
JP2004502075A (ja) 2004-01-22
WO2002001066A1 (fr) 2002-01-03

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