WO2009153086A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO2009153086A1
WO2009153086A1 PCT/EP2009/054802 EP2009054802W WO2009153086A1 WO 2009153086 A1 WO2009153086 A1 WO 2009153086A1 EP 2009054802 W EP2009054802 W EP 2009054802W WO 2009153086 A1 WO2009153086 A1 WO 2009153086A1
Authority
WO
WIPO (PCT)
Prior art keywords
control chamber
filler
fuel injection
injection valve
nozzle
Prior art date
Application number
PCT/EP2009/054802
Other languages
German (de)
English (en)
Inventor
Jens Leister
Holger Rapp
Friedrich Howey
Cetin Irmak
Kasim-Melih Hamutcu
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
Priority to EP09765666A priority Critical patent/EP2294308A1/fr
Publication of WO2009153086A1 publication Critical patent/WO2009153086A1/fr

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
    • 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
    • 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

Definitions

  • the invention relates to a fuel injection valve with a switching valve arranged on the head side. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • an injector for injecting a fluid under high pressure by means of a nozzle is known.
  • the known injector body comprises a high-pressure inlet line and a non-pressurized outlet. Furthermore, the injector body contains a solenoid valve, which serves to control the nozzle.
  • an axially extending sleeve is movably received, whose one end face is actuated by means of a valve and the other end face defines a control chamber into which a branch of a high-pressure inlet opens.
  • the known from DE 199 56 522 Al injector has the disadvantage that the design is relatively expensive. Specifically, in a diameter range extending in the injector from an outlet throttle in the upper region to a conical seat stop in the region of the nozzle, the Sleeve in the injector a clearance of more than 0.01 mm, wherein the diameter of the bore in the axially extending sleeve is in the range of 1.5 mm. And in the diameter range extending from the conical seat stop to the sleeve end face, the sleeve is mounted approximately free of play, specifically with a clearance of less than 0.01 mm, which places very high demands on the concentricity and machining quality of the sleeve component.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the manufacturability, in particular with respect to a control chamber bore, is improved, wherein a head-side arrangement of the switching valve in the fuel injection valve is possible.
  • Control chamber bore of the holding body extends.
  • the filler in the control chamber bore sections have a three- or polygonal cross-section, so that one or more retaining edges are formed. With the retaining edge, the filler can form an interference fit with the control chamber bore in order to achieve a reliable attachment of the filler in the control chamber bore. As a result, the filler is fixed in the axial direction.
  • the filler in the control chamber bore is axially displaceable. This has the advantage that pressure changes, which are generated by the switching valve for driving the nozzle needle, also or even substantially affect a displacement of the filler in the control chamber bore. Thereby, a throttle effect that occurs when the pressure change propagates through the gap between the filler and the control space bore can be reduced.
  • a dimensioning is particularly advantageous in which the diameter of the control chamber bore has a similar or the same size as the diameter of that part of the nozzle needle, which dips into the control chamber, wherein also the filler is arranged axially displaceable in the control chamber bore and not at rest an upper stop.
  • the filler moves analogously to the nozzle needle up and down, so that little or no Fuel from the nozzle side of the filler located portion of the control chamber in the control valve side part or vice versa must be spent.
  • the filler can be inserted only in the control chamber bore, so that it remains axially displaceable therein. It is advantageous that a spring element is provided, that the filler has a shoulder, that the filler abuts at its shoulder on a nozzle body side stage of the control chamber bore and that the spring element presses the filler against the nozzle body side stage. As a result, the filler can be acted upon by the bias of the spring element in order to achieve an axial fixation of the filler.
  • the spring element can be supported on the end face of the nozzle needle, whereby in addition a loading of the nozzle needle is possible, which optionally exerts a restoring force on the nozzle needle.
  • a nozzle spring is provided, which is supported on the one hand at a stage of the control chamber bore and on the other hand on a shoulder of the filler, and that the nozzle spring presses the filler against the end face of the nozzle needle.
  • a plant of the filler can be achieved on the nozzle needle.
  • the nozzle spring can exert a restoring force on the nozzle needle for closing the fuel injection valve.
  • a control room tube is provided, which is at least partially disposed in the control chamber bore, that the control room tube divides the control chamber bore into a control chamber surrounding the high-pressure part and a provided within the control room tube control chamber part, which forms the control chamber, and that the filler in the Control chamber part of the control chamber bore is arranged.
  • the nozzle needle may be guided in the control room tube. It is also advantageous that the control room tube of a nozzle spring is acted upon, which is supported on the one hand on the control room tube and on the other hand on the nozzle needle.
  • Fig. 1 is a fuel injection valve in a schematic sectional view according to a first embodiment of the invention.
  • FIG. 2 shows the detail of a fuel injection valve designated II in FIG. 1 in accordance with a second exemplary embodiment of the invention
  • FIG. 3 shows the detail of a fuel injection valve designated by III in FIG. 1 in accordance with a third exemplary embodiment of the invention
  • Fig. 4 is an excerpt section through the fuel injection valve shown in Fig. 3 along the section line designated IV and
  • Fig. 5 is a fuel injection valve in a schematic sectional view according to a fourth embodiment of the invention.
  • FIG. 1 shows a fuel injection valve 1 in a schematic sectional view according to a first embodiment of the invention.
  • Fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a multi-part valve housing 2, which in this embodiment comprises a nozzle body 3, a holding body 4 and a head-side housing part 5.
  • the nozzle body 3, the holding body 4 and the head-side housing part 5 are connected to each other in a suitable manner.
  • the holding body 4 is at least partially disposed in the mounted state within a bore of an internal combustion engine.
  • the head-side housing part 5 is arranged outside the bore, so that it can be made relatively large. This results in favorable installation conditions for components of the fuel injection valve 1, which are provided in the head-side housing part 5.
  • a switching valve 6 is arranged, which may have a magnetic actuator, a piezoelectric actuator or another actuator.
  • the valve housing 2 of the fuel injection valve 1 has a fuel inlet 7, which is connected for example to a common rail. From the fuel inlet 7 branches a fuel channel 8 from which is guided by the holding body 4 and opens into a further fuel channel 9 in the nozzle body 3. In the nozzle body 3, a fuel space 10 is formed, which is filled via the fuel channels 8, 9 in operation with fuel under high pressure.
  • the nozzle body 3 has a valve seat surface 11 which cooperates with a valve closing body 12 of a nozzle needle 13 arranged in the nozzle needle 13 to a sealing seat. When opening the nozzle needle 13 along an axis 14 of the sealing seat is released, so that fuel from the fuel chamber 10 via at least one nozzle opening 15 is hosed. The actuation of the nozzle needle 13 is described below in further detail.
  • the holding body 4 has a control space bore 20 which extends along the axis 14 substantially over the entire length of the holding body 4.
  • an inlet throttle 21 is provided at the head end of the control chamber bore 20, via the fuel from the fuel inlet 7 into the control chamber bore 20 can be guided.
  • an outlet throttle 22 is provided.
  • the outlet throttle 22 can be connected via the arranged in the head-side housing part 5 switching valve 6 with a fuel return 23, which leads to a tank 24. The connection is controllable via the switching valve 6.
  • the nozzle needle 13 has an end face 25 which defines a control chamber 26 together with the control chamber bore 20.
  • an inflow from the inlet throttle 21 and an outflow of fuel via the outlet throttle 22 is given in a head-side part 27 of the control chamber 26.
  • a filler 30 is arranged, which is almost extends over the entire length of the control chamber bore 20. Between the control chamber bore 20 and the filler 30, an annular gap-shaped part 28 of the control chamber 26 is formed. Furthermore, the control chamber 26 has a nozzle-side part 29. Through the filler 30, the fuel-filled volume of the control chamber bore 20 is significantly reduced.
  • the filler 30 is formed of a solid, preferably a steel.
  • the filler 30 does not contribute to the elasticity of the control space 26 practically. As a result, even with a relatively large spatial distance between the arranged in the head-side housing part 5 switching valve 6 and arranged in the nozzle body 3 nozzle needle 13 a rigid connection of the nozzle needle 13 to the switching valve 6 without direct mechanical power transmission can be achieved.
  • the pressure builds up in the head-side part 27 and thus also in the nozzle-side part 29 of the control chamber 26 again.
  • a closing force acts on the end face 25 of the Nozzle needle 13 a closing force, which is supported by the force of a nozzle-side part 29 of the control chamber 26 arranged nozzle spring 35.
  • the nozzle spring 35 also ensures an axial fixation of the filler piece 30.
  • the filler piece 30 has a shoulder 36 which rests against a nozzle-body-side step 37 of the control chamber bore 20.
  • the nozzle spring 35 presses the shoulder 36 against the nozzle body-side stage 37.
  • Fig. 2 shows the designated in Fig. 1 with II section of a fuel injection valve according to a second embodiment of the invention.
  • the filler 30 has a head portion 39, on which a shoulder 36 is provided.
  • a nozzle spring 35 is located on the one hand on the nozzle body side step 37 of the control chamber bore 20 and on the other hand on the shoulder 36 of the head portion 39 of the filler 30 at.
  • the filler 30 is pressed with its head part 39 against the end face 25 of the nozzle needle 13.
  • the filler 30 is arranged axially displaceable, so that it follows the movement of the nozzle needle 13.
  • the nozzle spring 35 acts on the nozzle needle 13 in the direction of the valve seat surface 11.
  • the filler 30 may be positioned at a lower stop, which is given in this embodiment by the end face 25 of the nozzle needle 13.
  • Fig. 3 shows the designated in Fig. 1 with III section a fuel injection valve 1 according to a third embodiment of the invention.
  • the filling piece 30 has at least one section 40, in which at least one edge 41 is formed on the filling piece 30. With the edge 41, the filler 30 is pressed against the control chamber bore 20, so that a fixation of the filler 30 in the axial direction, that is along the axis 14, is given.
  • FIG. 4 shows the section of the fuel injection valve 1 of the third, designated IV in FIG. 3
  • the filling piece 30 has a triangular cross-section in the section 40, so that the edges 41, 42, 43 are formed. In the region of the edges 41, 42, 43 while a press fit between the filler 30 and the control chamber bore is formed.
  • the section 40 can be configured, for example, by grinding on the filler 30.
  • Fig. 5 shows a fuel injection valve 1 in a schematic sectional view according to a fourth embodiment of the invention.
  • a control room tube 50 is provided.
  • the control room tube 50 is arranged in the holding body 4 of the valve housing 2.
  • the control chamber tube 50 is inserted into the control chamber bore 20, wherein the control chamber 50, the control chamber bore 50 in a surrounding the control chamber 50 high-pressure part 51, which is designed ringpaltförmig, and a provided within the control chamber tube 50 control chamber part divides, which forms the control chamber 26.
  • the filler 30 is arranged within the control space tube 50, that is, in the control chamber 26, the filler 30 is arranged.
  • the filler 30 is substantially rod-shaped and cylindrical designed. Between the filler 30 and the control chamber tube 50 an annular gap-shaped part 28 of the control chamber 26 is formed.
  • the inlet throttle 21, via which high-pressure fuel can flow into the head-side part 27 of the control chamber 26, is configured in the control chamber tube 50 in the region of the head-side part 27 in this exemplary embodiment. This can be done for example by a hole in the control room tube 50.
  • the nozzle needle 13 has a pressure pin 52, with which the nozzle needle 13 is axially guided in the control chamber tube 50.
  • the pressure pin 52 is designed in one piece with the nozzle needle 13.
  • the nozzle spring 35 is placed on the pressure pin 52.
  • the nozzle spring 35 is supported, on the one hand, on the control space pipe 50 and, on the other hand, on the nozzle needle 13.
  • the pressure of the fuel in the control chamber 26 acts in the region of the nozzle-side part 29 of the control chamber 26 on the end face 25 of the nozzle needle 13, which is formed in this embodiment by the end face 25 of the pressure pin 52.

Landscapes

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

Abstract

Injecteur de carburant (1) servant notamment d'injecteur dans des systèmes d'injection de carburant de moteurs à combustion interne à compression d'air et auto-allumage. Cet injecteur de carburant comporte un boîtier (2) en plusieurs parties, composé d'une partie supérieure (5), d'un corps d'injecteur (3) et d'un élément de maintien (4) qui relie la partie supérieure (5) et le corps d'injecteur (3). Dans la partie supérieure (5) du boîtier est montée une vanne de commande (6) et dans le corps d'injecteur (3) est disposée une aiguille d'injecteur (31). Dans l'élément de maintien (4) est façonné un alésage d'espace de commande (20) qui définit un espace de commande (26) avec la face frontale (25) de l'aiguille d'injecteur (13). L'élément de maintien (4) étant relativement long, l'alésage de l'espace de commande (20) présente par conséquent un grand volume. Dans l'espace de commande (26) est logé un élément de remplissage (30) qui réduit notablement le volume de l'espace de commande (26), ce qui permet une commande relativement directe de l'aiguille d'injecteur (13) par la vanne de commande (6).
PCT/EP2009/054802 2008-06-19 2009-04-22 Injecteur de carburant WO2009153086A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09765666A EP2294308A1 (fr) 2008-06-19 2009-04-22 Injecteur de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810002522 DE102008002522A1 (de) 2008-06-19 2008-06-19 Brennstoffeinspritzventil
DE102008002522.4 2008-06-19

Publications (1)

Publication Number Publication Date
WO2009153086A1 true WO2009153086A1 (fr) 2009-12-23

Family

ID=40908522

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/054802 WO2009153086A1 (fr) 2008-06-19 2009-04-22 Injecteur de carburant

Country Status (3)

Country Link
EP (2) EP2439398B1 (fr)
DE (1) DE102008002522A1 (fr)
WO (1) WO2009153086A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2426349A1 (fr) * 2010-09-07 2012-03-07 Robert Bosch GmbH Injecteur de carburant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015118691A1 (de) * 2015-11-02 2017-05-04 L'orange Gmbh Kraftstoff-Einspritzinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5941215A (en) * 1997-02-19 1999-08-24 Daimler-Benz Ag Fuel injection system for a multicylinder internal combustion engine
US6260768B1 (en) * 1998-09-16 2001-07-17 Lucas Industries Pump injector including valve needle and spill valve
US6698673B1 (en) * 1999-11-24 2004-03-02 Robert Bosch Gmbh Injector for fuel injection taking place under high pressure
US6988680B1 (en) * 1999-08-23 2006-01-24 Robert Bosch Gmbh Injector of compact design for a common rail injection system for internal combustion engines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6499467B1 (en) * 2000-03-31 2002-12-31 Cummins Inc. Closed nozzle fuel injector with improved controllabilty
DE10149961A1 (de) * 2001-10-10 2003-04-30 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
DE10346212A1 (de) * 2003-10-06 2005-04-21 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102004015746A1 (de) * 2004-03-31 2005-10-13 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102006036447A1 (de) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5941215A (en) * 1997-02-19 1999-08-24 Daimler-Benz Ag Fuel injection system for a multicylinder internal combustion engine
US6260768B1 (en) * 1998-09-16 2001-07-17 Lucas Industries Pump injector including valve needle and spill valve
US6988680B1 (en) * 1999-08-23 2006-01-24 Robert Bosch Gmbh Injector of compact design for a common rail injection system for internal combustion engines
US6698673B1 (en) * 1999-11-24 2004-03-02 Robert Bosch Gmbh Injector for fuel injection taking place under high pressure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2426349A1 (fr) * 2010-09-07 2012-03-07 Robert Bosch GmbH Injecteur de carburant

Also Published As

Publication number Publication date
EP2439398B1 (fr) 2014-07-16
DE102008002522A1 (de) 2009-12-24
EP2294308A1 (fr) 2011-03-16
EP2439398A1 (fr) 2012-04-11

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