EP1518049B1 - 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
EP1518049B1
EP1518049B1 EP03718631A EP03718631A EP1518049B1 EP 1518049 B1 EP1518049 B1 EP 1518049B1 EP 03718631 A EP03718631 A EP 03718631A EP 03718631 A EP03718631 A EP 03718631A EP 1518049 B1 EP1518049 B1 EP 1518049B1
Authority
EP
European Patent Office
Prior art keywords
valve
needle
combustion chamber
hollow
chamber end
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
EP03718631A
Other languages
German (de)
English (en)
Other versions
EP1518049A1 (fr
Inventor
Detlev Di Potz
Thomas Kuegler
Predrag Nunic
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 EP1518049A1 publication Critical patent/EP1518049A1/fr
Application granted granted Critical
Publication of EP1518049B1 publication Critical patent/EP1518049B1/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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling 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
    • F02M61/16—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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention is based on a fuel injection valve for internal combustion engine, as it corresponds to the preamble of patent claim 1.
  • a fuel injection valve for example from the published patent application DE 27 11 391 and has a valve body in which a valve hollow needle is arranged to be longitudinally displaceable in a bore.
  • the valve hollow needle has at its combustion chamber end a conical valve sealing surface, with which it cooperates with a conical valve seat which forms the combustion chamber end of the bore.
  • a valve needle is arranged longitudinally displaceable, which also has a conical valve contact surface and cooperates with the valve seat. Both the valve hollow needle and the valve needle control the flow of fuel to at least one injection opening, through which fuel is injected into the combustion chamber of the internal combustion engine.
  • valve needle In the known fuel injection valve from DE 27 11 391, the tip of the valve hollow needle is flattened, so that an end face is formed, which lies in a radial plane of the valve hollow needle.
  • this valve needle has the disadvantage that between the valve hollow needle, the valve needle and the valve seat forms a relatively large dead volume, which has an adverse effect on the hydrocarbon emissions of the fuel injection valve.
  • a fuel injection valve in which the hollow valve needle has no flattening, but expires pointed. Although this reduces the dead volume and thus has a favorable effect on the hydrocarbon emissions of the internal combustion engine, but here there is the disadvantage that the inner needle can easily pinch in the outer needle. Due to the installation of the valve hollow needle on the conical valve seat, the valve hollow needle deforms slightly radially inwards, so that the already very small annular gap between the valve needle and the valve hollow needle is further reduced. This can lead to increased wear between these two slidably mounted components, which leads to a reduction in the life of the fuel injection valve.
  • a hollow valve needle which has a flattening at its combustion chamber end.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that a clamping of the valve needle is effectively prevented in the hollow valve needle with simultaneously reduced hydrocarbon emissions of the fuel injection valve.
  • the hollow valve needle at its tip a chamfer, which connects directly to the conical valve sealing surface. Since the outermost valve tip is no longer directly influenced by the force generated by the pressing of the hollow valve needle on the conical valve seat, results in a much lower indentation of the valve needle, and thus a jamming or excessive wear during movement prevents the valve needle in the valve hollow needle.
  • the volume between the valve hollow needle, the valve needle and the valve seat, when both the valve needle and the valve hollow needle abut the valve seat remains so low that there is no significant increase in the hydrocarbon emissions of the internal combustion engine.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention.
  • a valve body 1 In a valve body 1, a bore 3 is formed, at the combustion chamber end of which a conical valve seat 18 is formed.
  • a piston-shaped valve hollow needle 5 In the bore 3, which has a longitudinal axis 8, a piston-shaped valve hollow needle 5 is arranged longitudinally displaceable.
  • the valve hollow needle 5 is sealingly guided in a bore away from the combustion chamber in the bore 3 and tapers the valve seat 18 to form a pressure shoulder 14.
  • the hollow valve needle 5 has a conical valve sealing surface 24 which in the closed position of the valve hollow needle 5 on the valve seat 18th comes to the plant.
  • a pressure chamber 10 is formed, which is radially expanded at the level of the pressure shoulder 14. In the radial extension of the pressure chamber 10 opens a formed in the valve body 1 Inlet channel 12, via which the pressure chamber 10 can be filled with fuel under high pressure.
  • the valve hollow needle 5 has a longitudinal bore 6, whose longitudinal axis coincides with the longitudinal axis 8 of the valve hollow needle 5.
  • a valve needle 7 is arranged longitudinally displaceable, which has a conical valve contact surface 26 at its combustion chamber end, which likewise comes into contact with the valve seat 18 in the closed position of the valve needle 7.
  • a brennraumabgewandter, first guide portion 16 and a combustion chamber facing, second guide portion 17 is formed, in which it is guided relatively tight in the hollow valve needle 5.
  • the clearance between the second guide portion 17 and the wall of the longitudinal bore 6 is very small, preferably less than 10 microns. Between these two guide portions 16, 17, a relatively large annular gap between the valve needle 7 and the wall of the longitudinal bore 6 is formed, so that the valve needle 7 is actually guided only at the two guide portions 16, 17.
  • FIG. 1 shows this an enlargement of Figure 1 in the region of the valve seat 18 and Figure 3 again the same section as Figure 2, wherein the valve hollow needle 5 is not shown cut here.
  • the valve hollow needle 5 is in its closed position on the valve seat 18, wherein the valve sealing surface 24, the outer injection ports 20 closes.
  • the valve needle 7 closes with its valve contact surface 26, the inner injection openings 22.
  • annular groove 32 is formed, which is bounded on the one hand by the cylindrical portion of the valve needle 7 and on the other hand by the valve contact surface 26. Through this Ring groove 32 results in an attack surface for the fuel pressure of the pressure chamber 10 when the pressure acts on the valve needle 7.
  • Both the valve hollow needle 5 and the valve needle 7 are acted upon by a device, such as a spring, not shown in the drawing, with a closing force in the direction of the valve seat 18, so that they remain in their closed position in the absence of further forces.
  • a device such as a spring, not shown in the drawing
  • a closing force in the direction of the valve seat 18, so that they remain in their closed position in the absence of further forces.
  • a hydraulic force results on the pressure shoulder 14, which is opposite to the closing force on the valve hollow needle 5. If this hydraulic force exceeds the closing force, the valve hollow needle 5 lifts off from the valve seat 18 and releases the outer injection openings 20, through which fuel is injected into the combustion chamber of the internal combustion engine.
  • the valve needle 7 remains in its closed position until the now acting hydraulic pressure on the pressure shoulder, which is formed by the annular groove 32, sufficient to overcome the closing force on the valve needle 7.
  • valve needle 7 also moves out of its closed position, the fuel is injected in addition to the outer injection openings 20 also through the inner injection openings 22. If, however, only injected through the outer injection openings 20, the closing force on the valve needle 7 becomes so high held that they are not moved by the hydraulic pressure from its closed position. In this way, only a part of the entire injection cross section or the entire injection cross section can be controlled for the injection of fuel into the combustion chamber of the internal combustion engine.
  • a further conical surface 124 is formed, which adjoins the valve sealing surface 24 and extends to the cylindrical portion of the valve hollow needle 5.
  • a chamfer 30 connects to the valve seat 18, which forms a conical surface.
  • the chamfer 30 is inclined relative to the radial plane of the longitudinal axis 8.
  • the cone forming the conical surface of the chamfer 30 has a larger opening angle than the valve sealing surface 24.
  • the chamfer 30 prevents, on the one hand, that the valve hollow needle 5 experiences a radially inwardly directed force on its combustion-chamber-side end as a result of its contact with the conical valve seat 18 it may come to a pinching of the valve needle 7 in the valve hollow needle 5.
  • the valve hollow needle 5 has a sufficient wall thickness, so that only a very small indentation in the radial direction occurs due to the closing force on the valve hollow needle 5 and the valve needle 7 retains sufficient mobility in the longitudinal bore 6.
  • valve sealing surface 24 Since the angles of inclination of the valve sealing surface 24, the valve abutment surface 26 and the valve seat 18 are optimized so that a sealing of the injection openings 20, 22 is ensured against the pressure chamber 10, it may happen that fuel from between the valve seat 18 and the valve pins 5, 7 formed cavity in the injection breaks through the injection ports 20, 22 passes into the combustion chamber of the internal combustion engine and there leads to increased hydrocarbon emissions.
  • this volume By a corresponding inclination angle of the chamfers 30, this volume can be minimized without affecting the reduction in wear.

Landscapes

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

Abstract

L'invention concerne une soupape d'injection de carburant pour moteurs à combustion interne, comprenant un corps de soupape (1) pourvu d'un orifice (3) dans lequel est logée une aiguille creuse de soupape (5) de façon à pouvoir être déplacée longitudinalement. Cette aiguille creuse de soupape (5) présente, au niveau de son extrémité située côté chambre de combustion, une surface étanche conique (24) qui coopère avec un siège de soupape (18) conique disposé à l'extrémité dudit orifice (3) située côté chambre de combustion. L'aiguille creuse de soupape (5) comporte un orifice longitudinal (6) dans lequel est disposée une aiguille de soupape (7) présentant, au niveau de son extrémité située côté chambre de combustion, une surface d'appui (26) qui coopère également avec le siège de soupape (18). La pointe de l'aiguille creuse de soupape (5) se trouvant côté chambre de combustion comporte une section biseautée (30).

Claims (3)

  1. Injecteur de carburant pour moteurs à combustion interne, comprenant un corps de soupape (1) logeant une aiguille creuse de soupape (5), mobile longitudinalement dans un alésage (3) et dont l'extrémité côté chambre de combustion présente une surface d'étanchéité de soupape (24) conique qui coopère avec un siège de soupape (18) conique disposé à l'extrémité de l'alésage (3) côté chambre de combustion, et avec un alésage longitudinal (6) formé dans l'aiguille creuse de soupape (5) et recevant une aiguille de soupape (7) qui coopère également avec le siège de soupape (18) par une surface d'appui de soupape (26) formée à son extrémité côté chambre de combustion, un chanfrein (30) étant formé à la pointe de l'aiguille creuse de soupape (5) côté chambre de combustion,
    caractérisé en ce que
    le chanfrein (30) de l'aiguille creuse de soupape (5) forme une surface conique directement raccordée à la surface d'étanchéité de soupape (24) conique.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le chanfrein (30) est directement adjacent à la surface d'enveloppe intérieure de l'alésage longitudinal (6) de l'aiguille creuse de soupape (5) par sa bordure intérieure côté chambre de combustion.
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'aiguille de soupape (7) est guidée dans sa zone terminale côté chambre de combustion avec un faible jeu dans l'aiguille creuse de soupape (5), le jeu étant inférieur à 10 µm.
EP03718631A 2002-06-19 2003-03-26 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1518049B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10227277A DE10227277A1 (de) 2002-06-19 2002-06-19 Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10227277 2002-06-19
PCT/DE2003/000991 WO2004001219A1 (fr) 2002-06-19 2003-03-26 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1518049A1 EP1518049A1 (fr) 2005-03-30
EP1518049B1 true EP1518049B1 (fr) 2006-05-10

Family

ID=29719233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03718631A Expired - Lifetime EP1518049B1 (fr) 2002-06-19 2003-03-26 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (6)

Country Link
US (1) US7044406B2 (fr)
EP (1) EP1518049B1 (fr)
JP (1) JP2005530091A (fr)
CN (1) CN100370132C (fr)
DE (2) DE10227277A1 (fr)
WO (1) WO2004001219A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351881A1 (de) * 2003-10-30 2005-06-02 Robert Bosch Gmbh Injektor mit Strukturen zur Begrenzung verschleißbedingter Änderungen eines Öffnungsverlaufs
TR200402050A2 (tr) * 2004-08-18 2006-03-21 Robert Bosch Gmbh Eşeksenli alansal temaslı çift oturma çaplı enjektör
WO2006108078A1 (fr) * 2005-04-06 2006-10-12 General Motors Global Technology Operations, Inc. Configuration de grappes a double rangee pour injecteur permettant une reduction des emissions de suies
DE102014000103A1 (de) * 2013-01-11 2014-07-17 Kw Technologie Gmbh & Co. Kg "Vorrichtung zum Versprayen von Flüssigkeit in einen Betriebsraum"
JP5716788B2 (ja) * 2013-04-25 2015-05-13 株式会社デンソー 燃料噴射弁
GB201309122D0 (en) * 2013-05-21 2013-07-03 Delphi Tech Holding Sarl Fuel Injector
DE102014224348A1 (de) * 2014-11-28 2016-06-02 Robert Bosch Gmbh Direkteinblasender Gasinjektor mit verbessertem Öffnungs- und Schließverhalten
JP2017008861A (ja) * 2015-06-24 2017-01-12 株式会社デンソー 燃料噴射ノズル
JP6507890B2 (ja) * 2015-07-02 2019-05-08 株式会社デンソー 燃料噴射弁
US10453490B2 (en) 2017-12-19 2019-10-22 Panasonic Intellectual Property Management Co., Ltd. Optical disc device
DE102019210142A1 (de) * 2019-07-10 2021-01-14 Robert Bosch Gmbh Einspritzventil für ein Wassereinspritzsystem eines Verbrennungsmotors sowie Wassereinspritzsystem mit einem solchen Einspritzventil

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711391A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE3236046C2 (de) * 1982-09-29 1986-03-20 Daimler-Benz Ag, 7000 Stuttgart Kraftstoffeinspritzdüse für Brennkraftmaschinen
DE3429471C2 (de) * 1984-08-10 1987-04-30 L'Orange GmbH, 7000 Stuttgart Kraftstoffeinspritzdüse für eine Brennkraftmaschine
DE3938551A1 (de) * 1989-11-21 1991-05-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE69922087T2 (de) * 1998-06-24 2005-12-01 Delphi Technologies, Inc., Troy Brennstoffeinspritzdüse
GB9903496D0 (en) * 1999-02-16 1999-04-07 Lucas Ind Plc Fuel injector
DE10122241A1 (de) * 2001-05-08 2002-12-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
US7044406B2 (en) 2006-05-16
CN1662742A (zh) 2005-08-31
DE50303303D1 (de) 2006-06-14
JP2005530091A (ja) 2005-10-06
DE10227277A1 (de) 2004-01-08
CN100370132C (zh) 2008-02-20
EP1518049A1 (fr) 2005-03-30
US20050139698A1 (en) 2005-06-30
WO2004001219A1 (fr) 2003-12-31

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