WO2009132879A2 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
WO2009132879A2
WO2009132879A2 PCT/EP2009/052638 EP2009052638W WO2009132879A2 WO 2009132879 A2 WO2009132879 A2 WO 2009132879A2 EP 2009052638 W EP2009052638 W EP 2009052638W WO 2009132879 A2 WO2009132879 A2 WO 2009132879A2
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injection
injection device
valve element
combustion chamber
housing
Prior art date
Application number
PCT/EP2009/052638
Other languages
German (de)
English (en)
Other versions
WO2009132879A3 (fr
Inventor
Hans-Christoph Magel
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 WO2009132879A2 publication Critical patent/WO2009132879A2/fr
Publication of WO2009132879A3 publication Critical patent/WO2009132879A3/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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine with direct fuel injection, with a housing having a combustion chamber of the internal combustion engine facing the combustion chamber near the end and in which a valve element is guided to and fro, whose combustion chamber distal end guided in a guide piece is radially inwardly defining a control space and radially outwardly a guide annulus extending between the guide piece and the housing and communicating with a high pressure source, and having an internal storage volume in a valve annulus extending between the valve element and the housing.
  • German Offenlegungsschrift DE 10 2006 012 078 A1 discloses a fuel injection device with a housing which has a recess stepped in its longitudinal direction, from whose lower end fuel outlet channels emanate, which pass through the wall of a nozzle body.
  • German laid-open specification DE 197 55 057 A1 discloses a fuel injection nozzle with an Nem annular space is known in which a against the restoring force of a spring axially displaceable sleeve is arranged, which rests with a conical end face on an outer annular surface of a conical seat and provided in the at least two successive alsberichtbare by axial displacement of the valve needle openings with different opening cross-section are.
  • the object of the invention is to provide a fuel injection device according to the preamble of claim 1, which has a long service life and is simple and inexpensive to produce. In particular, even when using a relatively long valve element multiple injections are to be made possible with high accuracy.
  • the object is in a fuel injection device for an internal combustion engine with direct fuel injection, with a housing having a combustion chamber of the internal combustion engine facing the combustion chamber near end and in which a valve element is guided to and fro whose combustion chamber remote end is guided in a guide piece which defines radially inwardly a control space and radially outwardly a guide annulus extending between the guide piece and the housing and communicating with a high pressure source, and having an internal storage volume in a valve annulus extending between the valve member and the housing , solved by that between the guide ring space and the internal Storage volume in the valve annulus a closing throttle is provided.
  • a preferred embodiment of the fuel injection device is characterized in that in the guide piece at least one through hole is provided, which represents a closing throttle point over which the guide annulus is in communication with the valve annulus.
  • the passage hole is preferably designed as a bore which extends in the radial direction.
  • the terms axial and radial refer to the longitudinal axis of the valve element. Axial means in Rich ⁇ tion or parallel to the longitudinal axis. Radial means transverse to the longitudinal axis.
  • the through hole allows a throttle effect, which has low temperature influences.
  • the valve element preferably has a length of more than 100 millimeters.
  • the two annular spaces are arranged coaxially with the valve element.
  • the valve element may be made in one piece or comprise a plurality of parts which are mechanically interconnected.
  • valve annulus is separated by a sealing element of the guide annulus.
  • the sealing element may be designed as a sealing ring which is clamped between the combustion chamber near the end of the guide piece and the housing.
  • a further preferred exemplary embodiment of the fuel injection device is characterized in that the sealing element is arranged in radial direction. - A -
  • the guide piece has at least one recess radially inward in the mouth region of the through-hole.
  • the recess allows the passage of fuel from the mouth area of the through-hole into the valve annulus.
  • a further preferred exemplary embodiment of the fuel injection device is characterized in that the valve element has at its end remote from the combustion chamber a guide section through which the valve element is guided in the guide piece and from which a connecting section extends which has a smaller diameter than the guide section.
  • the guide section preferably extends beyond the mouth region of the through-hole, so that the passage of fuel from the mouth region of the through-hole into the valve annulus is made possible in a simple manner.
  • valve element is guided in the vicinity of its end close to the combustion chamber in the housing.
  • the guide can be made by a guide portion which is provided on the valve element, or by a guide sleeve.
  • valve element is centered or guided with its end close to the combustion chamber in a guide sleeve.
  • the valve element is preferably a nozzle needle. Accordingly, the combustion chamber near the end of the valve element is also referred to as a needle tip. In the embodiment with the guide sleeve for centering the needle tip, there is no cost-effective alternative possibility for realizing a closing throttle.
  • the above-mentioned object is in a fuel injection device for an internal combustion engine with direct fuel injection, with a housing having a combustion chamber of the internal combustion engine facing the combustion chamber near end and in which a valve element is guided to and fro, in particular in advance described fuel injection device, also achieved in that the valve element is only centered in the vicinity of its combustion chamber near end in the housing.
  • a valve seat is formed, in the vicinity of which the centering is provided. Through the seat-centering can be ensured without guiding the combustion chamber near the end of the valve element, a symmetrical spray pattern.
  • An additional guide sleeve can be omitted.
  • a further preferred embodiment of the fuel injection device is characterized in that the valve element in the vicinity of his Near the combustion chamber end has a centering collar, through which the combustion chamber near the end of the valve element is centered in the housing.
  • the centering collar may be provided with flats that allow the passage of fuel from the internal storage volume to the valve seat.
  • a further preferred embodiment of the fuel injector is characterized in that the centering collar has a thickness of we ⁇ niger than one millimeter. This thickness, ie the expansion of the centering collar in the axial direction, has proved to be particularly advantageous in the context of the present invention.
  • Another preferred embodiment of the fuel injection device is characterized in that the centering collar is designed radially outwardly convex.
  • the crowned design ensures linear contact between the centering collar and the housing.
  • the injector housing comprises an injector body and a nozzle body.
  • the injector body is also referred to as a holding body.
  • the nozzle body is preferably provided with a valve seat surface against which a valve seat edge abuts, so that no fuel reaches injection ports provided in the nozzle body. Through the injection holes of the fuel enters at least one combustion chamber of an internal combustion engine.
  • the valve seat area which is connected to the valve Wegkante cooperates, is also referred to as a valve seat. Sitting close means in the vicinity of the valve seat or the valve seat edge or the valve seat surface.
  • the injector housing consists only of the injector body and the nozzle body.
  • a further preferred exemplary embodiment of the fuel injection device is characterized in that the valve element in the nozzle body has only a centering close to the seat and no further guidance.
  • a further preferred embodiment of the fuel injection device is characterized in that the valve element has a hinge portion which immediately follows the guide portion.
  • the valve element is made long according to another aspect of the invention. Long means that the length of the valve element is significantly larger than its diameter.
  • a nozzle needle is referred to, which protrudes far from the actual nozzle body and protrudes into a storage space in the injector to allow a favorable position of the solenoid valve (large space, easy contacting) on top of the injector. This results in conventional Dieselinjektoren a length of greater than 80 mm or a length to diameter ratio of 20 to 1.
  • FIG. 1 shows a longitudinal section through a fuel injection device according to a first embodiment with a combustion chamber near guide section;
  • Figure 2 shows a similar embodiment as in Figure 1 in longitudinal section with a near-the combustion chamber near the guide sleeve and
  • Figure 3 shows a similar embodiment as in Figures 1 and 2 in longitudinal section with a combustion chamber near centering collar.
  • FIGS. 1 to 3 three fuel injection devices 1; 51; 61 each shown in longitudinal section.
  • the same or similar parts are provided with the same reference numerals. To avoid repetition, the common features of the various embodiments will be described below.
  • the fuel injection device 1; 51; 61 encloses a housing 2 with a combustion chamber near end 3, which projects into a combustion chamber of an internal combustion engine (not shown).
  • the housing 2 comprises a holding body 4 and a nozzle body 5, in which a valve element 8 is reciprocally accommodated.
  • the valve element 8 has a length of more than 100 millimeters and can be made in one piece as a nozzle needle. But the valve element 8 may also comprise a plurality of parts which are mechanically interconnected.
  • the Ventilele- ment 8 is a tip 9 with a sealing edge which sealingly against a sealing surface of the housing to at ⁇ able to form a valve seat. 11
  • the valve seat 11 is closed and thus a connection to spray holes 12, 13 is interrupted.
  • high-pressure fuel flows past the valve seat 11 to the spray holes 12, 13, from which the high-pressure fuel is injected into the combustion chamber of the internal combustion engine.
  • a guide section 14 on the valve element 8 is madebil ⁇ det in the embodiment shown in Figure 1.
  • the guide portion 14 is provided with flats that allow the passage of fuel lent.
  • the combustion chamber-near guide portion 14 is integrally formed by a connecting portion 16 with a combustion chamber distant gleichsab- 18 connected, through which the valve element 8 is guided at its combustion chamber remote end in a guide piece 22.
  • the combustion chamber remote end face of the guide portion 18 of the valve element 8 is limited in the guide piece 22 a control chamber 20th
  • the guide piece 22 essentially has the shape of a straight, hollow circular cylinder jacket whose outside diameter is smaller than the inside diameter of the housing 2. At its end near the combustion chamber, the guide piece 22 is open. In the radial direction between the guide piece 22 and the holding body 4, a guide ring space 24 is formed which communicates via a high-pressure line 25 with an external high-pressure fuel source 26.
  • the guide annular space 24 merges with a valve annular space 28, which is formed in the radial direction between the valve element 8 and the holding body 4 or the nozzle body 5.
  • the valve annulus 28 represents an internal storage volume.
  • the valve annulus 28 is separated from the guide annulus 24 by a sealing element 30.
  • the sealing element 30 is formed by a sealing ring with a circular cross-section, which is clamped in the radial direction between the combustion chamber near the end of the guide piece 22 and the holding body 4.
  • the valve annulus 28 communicates via a through-hole 32 with the guide annulus 24 in connection.
  • the through-hole 32 extends radially inward from the guide annulus 24 in the radial direction in at least one recess 34, 35, which is a free space between the valve element 8 and the guide piece 22.
  • the recess 34, 35 may be a connecting ring space, which arises because the outer diameter of the connecting portion 16 is smaller than the inner diameter of the guide piece 22.
  • the recesses 34, 35 can also be longitudinal grooves which are formed on the valve element 8. It is essential that the recesses 34, 35 create a flow connection between the through hole 32 and the valve annulus 28.
  • the through-hole 32 is a closing throttle or closing throttle that ensures that the pressure in the valve chamber 28 is slightly less than the pressure in the guide annulus 24. As a result, a closing movement of the valve element 8 is ensured.
  • the guide ring space 24 communicates via an inlet throttle 36 with the control chamber 20 in connection.
  • high-pressure fuel passes from the guide annulus 24 into the control chamber 20.
  • the pressure in the control chamber 20 can be relieved by means of a switching valve 40 via a return line 42 into a low-pressure region to effect an opening movement of the valve element 8.
  • a collar 44 is formed on which a closing spring 45 engages, which is clamped between the collar 44 and the combustion chamber near end face of the guide piece 22.
  • tension of the closing spring 45 is the Ventilele- ment biased 8 in its closed position, in which the valve seat 11 is closed.
  • the pressure in the control chamber 20 decreases, so that the valve element 8 opens, wherein fuel is injected through the injection holes 12, 13 in the combustion chamber of the internal combustion engine. To end the injection closes the switching valve 40, whereby the pressure in the control chamber 20 increases again to system pressure.
  • System pressure refers to the high pressure provided by the high pressure fuel source 26.
  • the pressure increase in the control chamber 20 causes the valve element 8 closes.
  • a through-hole 32 representing a closing throttle it is ensured that the pressure in the valve-annular space 28 is slightly lower than the pressure in the control chamber 20.
  • a hydraulic closing force is generated and the closing speed of the valve element 8 is increased.
  • the combustion chamber near the end of the valve element 8 is guided with a guide portion 53 in a guide sleeve 54 which is held by a spring 55 in contact with the nozzle body 5.
  • the guide sleeve 54 is provided with radially extending through-holes, which allow the passage of high-pressure fuel.
  • a seat near centering of the relatively long valve member 8 is proposed directly in the nozzle body 5. Since a centering in contrast to a guide has only a small area with high-precision game, it is much easier to manufacture and measure. The centering also provides the advantage that it can also be made very close to the seat and thus deep in the nozzle body.
  • a centering collar 64 is formed on the tip 9 of the valve element 8, which bears against the nozzle body 5.
  • the centering collar 64 may have a spherical shape on the outside. For centering a close game is sufficient at an axial point.
  • the valve seat 11 of the valve element 8 can be aligned exactly in the nozzle body 5.
  • the centering collar 64 since only a very short area, which may be less than a millimeter, is required with a highly accurate game, can be placed very close to the seat.
  • flow connections in the form of flats are provided, which allow the passage of fuel.
  • the centering collar 64 is mechanically connected via a connecting section 66 to a joint section 68, which has a smaller diameter and thus also a lower lateral bending stiffness than the connecting section 66. Due to the greatly reduced diameter in the articulated 68, strains and angular errors of the valve element 8 can be kept low by deflection as a result of manufacturing inaccuracies.
  • the hinge portion 68 directly to the combustion-chamber-remote guide section follows 18. Due to the reduction in diameter in the joint portion 68 is provided a clearance 70 beyond that allows the passage of fuel from the passage ⁇ hole 32 in the valve annulus 28th
  • the injector housing 2 comprises the holding body 4, which is also referred to as injector body 4, and the nozzle body 5.
  • the valve element 8 has, according to an essential aspect of the invention, only a seat-centering by the centering collar 64 and no further guidance in the injector 2. Particularly advantageous this is in connection with the joint portion 68 in the valve element 8, which follows UNMIT ⁇ telbar on the guide portion 18 with which the valve element 8 is guided with its combustion-chamber-remote end of the guide piece in the 22nd Especially before ⁇ part way it is is that extends through the injector body 4 formed in the internal storage volume through and guided with its combustion-chamber-remote end only with the guide portion 18 in the guide piece 22 in a long valve member 8.
  • the closing throttle can, as shown, be formed in the Füh ⁇ extension piece 22, or at centering 64th

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  • 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

L'invention concerne un dispositif d'injection de carburant pour un moteur à combustion interne à injection directe du carburant. Le dispositif d'injection de carburant selon l'invention comprend un carter (2) qui présente une extrémité (3) proche de la chambre de combustion orientée vers la chambre de combustion du moteur à combustion interne et dans lequel un élément soupape (8) peut faire un mouvement de va-et-vient. L'extrémité de l'élément soupape éloignée de la chambre de combustion est menée dans un élément de guidage (22) qui délimite une chambre de commande (20) radialement à l'intérieur et une chambre annulaire de guidage (24) radialement à l'extérieur. La chambre annulaire de guidage s'étend entre l'élément de guidage (22) et le carter (2) et est en liaison avec une source haute pression (26). Le dispositif d'injection de carburant selon l'invention comprend également un volume de stockage interne dans une chambre annulaire de soupape (28) qui s'étend entre l'élément soupape (8) et le carter (2). L'invention vise à créer un dispositif d'injection de carburant qui présente une longévité élevée et puisse être produit aisément et à bon marché. A cet effet, on place un ajutage de fermeture entre la chambre annulaire de guidage (24) et le volume de stockage interne dans la chambre annulaire de soupape (28).
PCT/EP2009/052638 2008-04-28 2009-03-05 Dispositif d'injection de carburant WO2009132879A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001425.7 2008-04-28
DE200810001425 DE102008001425A1 (de) 2008-04-28 2008-04-28 Kraftstoff-Einspritzvorrichtung

Publications (2)

Publication Number Publication Date
WO2009132879A2 true WO2009132879A2 (fr) 2009-11-05
WO2009132879A3 WO2009132879A3 (fr) 2010-01-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/052638 WO2009132879A2 (fr) 2008-04-28 2009-03-05 Dispositif d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102008001425A1 (fr)
WO (1) WO2009132879A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2486265A1 (fr) * 2009-10-07 2012-08-15 Robert Bosch GmbH Soupape d'injection de carburant
EP2357353A3 (fr) * 2010-02-16 2015-08-26 Robert Bosch GmbH Procédé de reconnaissance du moment de fermeture d'un élément de soupape d'injection dans une soupape d'injection de carburant et soupape d'injection de carburant
WO2015180883A1 (fr) * 2014-05-26 2015-12-03 Robert Bosch Gmbh Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000281A1 (de) 2009-01-19 2010-07-22 Robert Bosch Gmbh Kraftstoff-Injektor
DE102009001704B4 (de) 2009-03-20 2018-06-28 Robert Bosch Gmbh Kraftstoff-Injektor
DE102009028993A1 (de) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Kraftstoffinjektor
DE102009046452A1 (de) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Einspritzdüse für einen lecklosen Kraftstoffinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007147667A1 (fr) * 2006-06-23 2007-12-27 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur à combustion interne
WO2008015039A1 (fr) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injecteur pour un système d'injection de carburant
WO2008046679A1 (fr) * 2006-10-18 2008-04-24 Robert Bosch Gmbh injecteur d'injection de carburant
EP1990532A1 (fr) * 2007-05-07 2008-11-12 Robert Bosch GmbH Injecteur de carburant pour un moteur à combustion interne comprenant un système d'injection à rampe commune

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755057A1 (de) 1997-12-11 1999-06-17 Bosch Gmbh Robert Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
DE102006012078A1 (de) 2005-11-15 2007-05-16 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine mit Kraftstoff-Direkteinspritzung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007147667A1 (fr) * 2006-06-23 2007-12-27 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur à combustion interne
WO2008015039A1 (fr) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injecteur pour un système d'injection de carburant
WO2008046679A1 (fr) * 2006-10-18 2008-04-24 Robert Bosch Gmbh injecteur d'injection de carburant
EP1990532A1 (fr) * 2007-05-07 2008-11-12 Robert Bosch GmbH Injecteur de carburant pour un moteur à combustion interne comprenant un système d'injection à rampe commune

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2486265A1 (fr) * 2009-10-07 2012-08-15 Robert Bosch GmbH Soupape d'injection de carburant
EP2357353A3 (fr) * 2010-02-16 2015-08-26 Robert Bosch GmbH Procédé de reconnaissance du moment de fermeture d'un élément de soupape d'injection dans une soupape d'injection de carburant et soupape d'injection de carburant
WO2015180883A1 (fr) * 2014-05-26 2015-12-03 Robert Bosch Gmbh Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant
US10018169B2 (en) 2014-05-26 2018-07-10 Robert Bosch Gmbh Nozzle assembly for a fuel injector, and fuel injector

Also Published As

Publication number Publication date
WO2009132879A3 (fr) 2010-01-14
DE102008001425A1 (de) 2009-10-29

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