EP1088985B1 - Injecteur de carburant pour injection directe dans un moteur à combustion interne - Google Patents

Injecteur de carburant pour injection directe dans un moteur à combustion interne Download PDF

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Publication number
EP1088985B1
EP1088985B1 EP20000121484 EP00121484A EP1088985B1 EP 1088985 B1 EP1088985 B1 EP 1088985B1 EP 20000121484 EP20000121484 EP 20000121484 EP 00121484 A EP00121484 A EP 00121484A EP 1088985 B1 EP1088985 B1 EP 1088985B1
Authority
EP
European Patent Office
Prior art keywords
injector
jet
control piston
hole
needle
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
EP20000121484
Other languages
German (de)
English (en)
Other versions
EP1088985A2 (fr
EP1088985A3 (fr
Inventor
Ulrich Dr. Augustin
Dirk Dr. Baranowski
Wilhelm Frank
Wendelin KLÜGL
Günther Lewentz
Heinz Lixl
Gerd Dr. Schmutzler
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.)
Siemens AG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1088985A2 publication Critical patent/EP1088985A2/fr
Publication of EP1088985A3 publication Critical patent/EP1088985A3/fr
Application granted granted Critical
Publication of EP1088985B1 publication Critical patent/EP1088985B1/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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

Definitions

  • the present invention relates to an injector according to the preamble of claim 1.
  • the supply of the fuel into the control chamber and into the pressure chamber arranged in the region of the nozzle needle takes place in parallel.
  • the fuel supply hole branches into a fuel supply hole, which opens into the control space and a fuel supply hole, which opens into the pressure chamber at the nozzle needle.
  • the branching from the fuel supply bore into the control chamber and the nozzle chamber runs in the region of a throttle plate.
  • problems often occur at the branch point of the fuel supply bore to the control chamber and the pressure chamber in the separation region of the throttle plate and injector body, namely, where due to the prevailing high pressures and the very hot fuel special seals (metal seals) are required.
  • the still occurring leakage is returned to the tank in such injectors. Since the leak has a high temperature, additional cooling of the tank is necessary. Moreover, the power loss of the pump is very high, since the leaking leakage causes a loss of pressure in the separation area.
  • an injector for an internal combustion engine which comprises an injector body having an injector body portion and a nozzle body portion with an axially extending bore.
  • a fuel supply bore opens into the axial bore in the injector body, wherein a displaceable control piston is arranged in the axial bore.
  • a control chamber is arranged above the control piston, wherein a control chamber relieving controllable valve is provided.
  • the injector includes an extending through the axial bore, A nozzle needle communicating with the spool for opening and closing an injection port, and a nozzle spring biasing the nozzle needle into a needle seat in the region of the injection port.
  • the fuel supply bore opens into the axial bore in a region below the control piston and the supply of fuel into the control chamber takes place from a region of the axial bore below the control piston through a bore in the control piston.
  • FIG. 1 shows an injector 10.
  • the injector 10 includes an injector body 20 which is divided into an injector body portion 30 and a nozzle body portion 40. Through both sections 30,40 extends an axial bore 50.
  • a Kraftstoffzu Georgiabohrung 60 is formed, which is in communication with a rail (not shown).
  • the Kraftstoffzu Industriesbohrung 60 opens below a control piston 70 in the through the injector body 20 extending axial bore 50.
  • the control piston 70 is fixedly connected to a nozzle needle 80, which extends through the axial bore 50 in the injector 20 body.
  • the fuel thus passes through the KraftstoffzuGermanbohrung 60 in the axial bore 50 in the injector body 20. Consequently, the entire axial bore 50 is filled below the control piston 70 in the injector body 20 with fuel, which passes within the axial bore 50 into the region of an injection port 290.
  • the control piston 70, the injector body 20 and a not shown in detail electrically controllable valve 90 define a control chamber 100.
  • a bore 110 is formed, from which an inlet throttle 120 and an inlet throttle 130 open into the control chamber 100.
  • the inlet throttle 120 extends obliquely in the control piston 70 and the inlet throttle 130 extends from the bore 110 axially through the control piston 70.
  • an extension 140 is formed on the control chamber 100 facing the end face of the cylindrical control piston 70.
  • the extension 140, in the center of which the inlet throttle 120 is located, is the stop for the control piston 70 and thus for the nozzle needle 80.
  • the inlet throttle 130 opens in the region of this extension 140 into the control chamber 100, whereas the inlet throttle 120 in a region of the end face of the control piston 70 opens into the control chamber 100, which continues in the stop position of the control piston 70 in a discharge throttle 150 in the valve 90. It should be noted at this point that it is also conceivable to provide only one or more than two outlet throttles in the control piston 70.
  • the nozzle needle 80 is biased at rest by a spring 160 to a needle seat 170 in the nozzle body portion 40.
  • the spring 160 is supported via a dial 180 on a shoulder 190 in the injector body 20.
  • the power is transmitted to the nozzle needle 80 via a formed on the nozzle needle 80 annular shoulder 200.
  • the centering body 210a is arranged in the form of a centering ring in a recess 220 on the outer circumference of the injector body section 30 and nozzle body section 40 in the contact region of the two body sections 30, 40.
  • the centering body 210b on the inner circumference, i. in the axial bore 50 of the injector body 20 so that it is located inside ( Figure 2). In both cases, the centering bodies 210a, 210b are introduced under tension.
  • a guide body 230a for the nozzle needle 80, through which the nozzle needle 80 extends, is arranged in the region of the axial bore 50 in the injector body 20 close to the needle seat 170.
  • the centering body 230 is necessary due to the long and slender nozzle needle 80 to ensure accurate needle guidance and accurate operation of the injector 10.
  • the centering body 230 is urged by a spring 240 in the outer region of the cylindrical Injektor Congress redesign 50.
  • the spring 240 is supported on the nozzle needle side via the annular shoulder 200 on the nozzle needle 80.
  • the nozzle needle 80 is guided in a concentrically arranged bore 250 in the guide body 230a.
  • the guide body 230a can be made of an annular starting material which is deformed symmetrically such that it is in each case at four points a, b, c, d, A, B, C, D on the nozzle needle 80 or abuts against the axial bore 50. After deformation and a In the hardening process, the guide body 230a is ground concentrically on its outer circumference A, B, C, D and on the inner surfaces a, b, c, d. By providing a slight interference fit between the centering body 230a and the nozzle body portion 40, the need for the spring 240 may be eliminated.
  • the centering body 230b may be made of an edged starting material. After hardening of the centering body 230b, only grinding of the outer X and inner Y diameters is necessary.
  • the embodiment of the injector 10 of Figure 2 differs from that of Figure 1 only by the implementation of the power transmission from the nozzle spring 160 to the nozzle needle 80. This is done via a spring ring 260 which is arranged in a groove 270 in the nozzle needle 80. About the spring ring 260, a spring plate 280 is pushed to prevent jumping out of the spring ring 260.
  • the guide body 230a, 230b and the spring 240 are not shown in the embodiment of Figure 2 for the sake of clarity, but can of course also be used in this embodiment.
  • FIG. 5 shows a further embodiment of the injector 10 is shown in a schematic representation.
  • the injector body section 30 and the nozzle body section 40 are formed in one piece. This eliminates the need for a centering between the two sections 30 and 40. It should not be ruled out, however, the embodiment of Figure 5 according to the embodiments of Figures 1 and 2 as in the injector body portion 30 and nozzle body portion 40 separate injector 20 perform.
  • the nozzle spring 160 biasing the nozzle needle 80 into the needle seat 170 is arranged in the embodiment of FIG. 5 in the control chamber 100. However, this has, as described in the embodiments described above, also via the bore 110 in the control piston 70 connection with the area below the control piston 70, in which the fuel supply takes place.
  • the nozzle spring 160 has a rectangular cross section. As a result, the harmful volume of the control chamber 100 is reduced.
  • a filler in the control room 100 is arranged.
  • the injector 10 described in FIGS. 1 to 4 operates as follows:
  • control piston 70 In the starting position according to FIG. 3A, the control piston 70 is in a lower position.
  • the nozzle needle 80 is displaced downwards into the nozzle needle seat 170 and closes the injection opening 290.
  • the outlet throttle 150 and a hole 300 that adjoins it are closed by the electrically controllable valve 90.
  • the control chamber 100 Via the two inlet throttles 120, 130, the control chamber 100 has access to the space below the control piston 70, which is under system pressure due to the connection of the fuel supply bore 60 to the rail.
  • control chamber 100 is relieved by activating the valve 90 and simultaneously opening the outlet throttle 150, ie fuel in the control chamber 100 flows via the outlet throttle 150 in the valve 90.
  • the control piston 70 shifts due to the now prevailing pressure difference - pressure in the control chamber 100 is lower than the system pressure below the control piston 70 - upwards.
  • the inlet throttle 130 is closed.
  • the valve 90 is driven again, so that the outlet throttle 150 is closed.
  • the fuel flows through the inlet throttle 120.
  • the control piston 70 moves slightly downward, the fuel can also pass through the inlet throttle 130 in the control chamber 100 and the control piston moves faster down and urges the associated nozzle needle 80 in their Needle seat 170, which closes the injection port 290.
  • the inlet throttle 120 has a smallest possible flow cross-section, the inlet throttle 130 has a large flow cross-section in the interest of fast needle closing.
  • An advantage of this embodiment of the injector according to the invention is that the nozzle needle 80 and the control piston 70 form a common production-favorable component.
  • the injector 10 is leak-free and consists of only a few parts.
  • the design of inlet and outlet throttles is a compromise in common rail systems.
  • the throttle combination described allows the throttle cross-sections to be designed optimally.
  • the control leakage can be avoided during the injection to a small residual value, in the illustrated form as a leak-like injector all leakage losses are almost eliminated.

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

Claims (8)

  1. Injecteur (10) pour un moteur à combustion interne à injection directe, comportant :
    - un corps d'injecteur (20), qui comporte un tronçon de corps d'injection (30) et un tronçon de corps de buse (40), avec un perçage (50) orienté dans le sens axial,
    - un perçage d'admission du carburant (60) qui débouche dans le perçage axial (50) dans le corps d'injecteur (20),
    - un piston de commande (70) mobile dans le perçage axial (50),
    - un piston de commande (70) agencé au-dessus de la chambre de commande (100),
    - une soupape (90) pouvant être actionnée en vue d'une détente de la chambre de commande (100),
    - une aiguille d'injecteur (80), qui s'étend à travers le perçage axial (50) et communique avec le piston de commande (70) et qui est destinée à ouvrir et fermer un orifice d'injection (290), et
    - un ressort d'injecteur (160), qui précontraint l'aiguille d'injecteur (80) dans un logement d'aiguille (170) dans la zone de l'orifice d'injection,
    - le perçage d'admission du carburant (60) débouchant dans le perçage axial (50) dans une zone en dessous du piston de commande (70),
    - le carburant étant admis dans la chambre de commande (100) à partir de la zone du perçage axial (50) en dessous du piston de commande (70) à travers une forure (110) dans le piston de commande (70),
    - le piston de commande (70) étant conçu sous forme de cylindre avec une saillie (140) agencée coaxialement sur la face frontale orientée vers la chambre de commande (100), deux orifices d'étranglement, conçus sous forme d'orifices d'étranglement d'admission (120, 130) débouchant depuis le perçage (110) dans la chambre de commande (100), l'un des deux orifices d'étranglement d'admission (120, 130) débouchant au centre dans la zone de la face frontale de la saillie (140) dans la chambre de commande (100), caractérisé en ce que la saillie (140) obture l'un des orifices d'étranglement d'admission (130) lorsqu'elle parvient contre une butée supérieure.
  2. Injecteur selon la revendication 1, caractérisé en ce que le tronçon de corps d'injection (30) et le tronçon de corps de buse (40) sont réalisés sous forme de deux parties.
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que, dans la zone de contact entre le tronçon de corps d'injection (30) et le tronçon de corps de buse (40), il est prévu un corps de centrage (210a, 210b) pour l'agencement concentrique exact du piston de commande (70) par rapport au logement d'aiguille (170).
  4. Injecteur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la transmission de force du ressort de gicleur (160) sur l'aiguille d'injecteur (80) est assurée par l'intermédiaire de moyens de transmission (200 ; 260, 270, 280) agencés au niveau du ressort d'injecteur (160).
  5. Injecteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le ressort d'injecteur (160) est agencé dans la chambre de commande (100).
  6. Injecteur selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'un corps de guidage (230a, 230b) pour l'aiguille d'injecteur (80) est agencé dans le perçage axial (50).
  7. Injecteur selon la revendication 6, caractérisé en ce que le corps de guidage (230a) est réalisé par formage d'un matériau initial tubulaire dans sa direction axiale, de telle sorte qu'il est en appui le long d'au moins trois lignes de contact respectivement contre l'aiguille d'injecteur (80) et contre le perçage axial (50).
  8. Injecteur selon la revendication 6, caractérisé en ce que le corps de guidage (230b) est réalisé dans un matériau en forme de barre polygonale, dans lequel est réalisé un perçage central destiné à recevoir l'aiguille d'injecteur (80).
EP20000121484 1999-09-29 2000-09-29 Injecteur de carburant pour injection directe dans un moteur à combustion interne Expired - Lifetime EP1088985B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999146766 DE19946766C2 (de) 1999-09-29 1999-09-29 Injektor für eine Brennkraftmaschine mit Direkteinspritzung
DE19946766 1999-09-29

Publications (3)

Publication Number Publication Date
EP1088985A2 EP1088985A2 (fr) 2001-04-04
EP1088985A3 EP1088985A3 (fr) 2003-11-19
EP1088985B1 true EP1088985B1 (fr) 2006-03-22

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Family Applications (1)

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EP20000121484 Expired - Lifetime EP1088985B1 (fr) 1999-09-29 2000-09-29 Injecteur de carburant pour injection directe dans un moteur à combustion interne

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EP (1) EP1088985B1 (fr)
DE (2) DE19946766C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7309031B2 (en) 2003-10-01 2007-12-18 Nippon Soken, Inc. Fuel injection valve
JP2008509311A (ja) * 2004-08-06 2008-03-27 ロバート ボッシュ ゲーエムベーハー 内燃機関の燃焼室の中へ燃料を噴射するための装置

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10132450B4 (de) * 2001-07-04 2010-02-11 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10154576C1 (de) * 2001-11-07 2003-04-17 Bosch Gmbh Robert Kraftstoffinjektor mit düsennaher Magnetventilanordnung
DE10160263A1 (de) 2001-12-07 2003-06-18 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10205185A1 (de) * 2002-02-08 2003-08-21 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10240440C1 (de) * 2002-09-02 2003-12-24 Siemens Ag Krafstoffinjektor, insbesondere Common-Rail-Dieselinjektor
DE10253721A1 (de) * 2002-11-19 2004-06-03 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102004024119B4 (de) 2004-05-14 2006-04-20 Siemens Ag Düsenbaugruppe und Einspritzventil
DE102006029392A1 (de) * 2006-06-27 2008-01-03 Robert Bosch Gmbh Injektor
DE102007035752A1 (de) * 2007-07-31 2009-02-05 Robert Bosch Gmbh Kraftstoffinjektor mit einer auf dem Kegelventilsitz einer Düsennadel aufsitzenden Zentrierhülse als Führung für die Düsennadel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2025054B3 (es) * 1985-12-02 1992-03-16 Marco Alfredo Ganser Aparato para inyeccion de fuel para motores de combustion interna.
DE4203343C1 (en) * 1992-02-06 1993-05-19 Mtu Friedrichshafen Gmbh IC engine fuel injection nozzle - has combustion chamber facing openings or spray holes coverable by peripheral closure wall parts
US5671715A (en) * 1995-04-27 1997-09-30 Nipon Soken, Inc. Fuel injection device
US5860597A (en) * 1997-03-24 1999-01-19 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
GB9725804D0 (en) * 1997-12-06 1998-02-04 Lucas Ind Plc Fuel injector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7309031B2 (en) 2003-10-01 2007-12-18 Nippon Soken, Inc. Fuel injection valve
JP2008509311A (ja) * 2004-08-06 2008-03-27 ロバート ボッシュ ゲーエムベーハー 内燃機関の燃焼室の中へ燃料を噴射するための装置
CN1993545B (zh) * 2004-08-06 2010-06-16 罗伯特·博世有限公司 用于将燃料喷入内燃机燃烧室的装置

Also Published As

Publication number Publication date
DE19946766A1 (de) 2001-04-26
DE50012433D1 (de) 2006-05-11
DE19946766C2 (de) 2001-07-26
EP1088985A2 (fr) 2001-04-04
EP1088985A3 (fr) 2003-11-19

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