EP1918570B1 - Injecteur de carburant doté d'un segment de volume de stockage - Google Patents

Injecteur de carburant doté d'un segment de volume de stockage Download PDF

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Publication number
EP1918570B1
EP1918570B1 EP07115999.0A EP07115999A EP1918570B1 EP 1918570 B1 EP1918570 B1 EP 1918570B1 EP 07115999 A EP07115999 A EP 07115999A EP 1918570 B1 EP1918570 B1 EP 1918570B1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
volume segment
accumulator volume
storage volume
nozzle
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.)
Not-in-force
Application number
EP07115999.0A
Other languages
German (de)
English (en)
Other versions
EP1918570A2 (fr
EP1918570A3 (fr
Inventor
Dietmar Uhlmann
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 EP1918570A2 publication Critical patent/EP1918570A2/fr
Publication of EP1918570A3 publication Critical patent/EP1918570A3/fr
Application granted granted Critical
Publication of EP1918570B1 publication Critical patent/EP1918570B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves
    • 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

Definitions

  • High system pressures and the rapid successive switching operations can affect the closing process of a fuel injector so that undesirable effects in the combustion process and increased wear on mechanical components of the fuel injector can occur.
  • storage volumes are suitable in conjunction with hydraulic throttle elements which are arranged in the immediate vicinity of the point of origin of the pressure oscillation.
  • an actuator space in which, for example, in fuel injectors, which are actuated by means of a piezoelectric actuator, the piezoelectric actuator is housed, and a nozzle chamber which can be filled with the liquid to be injected, for example of the fuel to be injected into the combustion chamber.
  • liquid volumes prove to be too small for effective damping damping occurring in terms of their damping effect.
  • this has its limit in that it does not allow the limited installation space on the internal combustion engine usually to increase the outer diameter of a fuel injector.
  • a fuel injection valve which has an injector body and an injection nozzle with a nozzle needle arranged therein.
  • a gap-shaped storage volume is formed which is in unthrottled fluidic connection with the injection nozzle and a fuel connection.
  • WO 03/016707 A1 discloses the preamble of claim 1.
  • the invention it is proposed to integrate in a fuel injector an additional storage volume which can be filled with fuel in order to dampen the pressure oscillations in the fuel injector after the injection.
  • the additional storage volume integrated in the fuel injector is formed in a chamber, such as a storage volume segment.
  • the fuel injector is lengthened by approximately 1 cm, resulting in a storage volume of 900 mm 3 that can be filled with fuel. If the inventively proposed storage volume segment is formed in double size, the result is a doubled storage volume for storable damping medium, such as fuel.
  • the additional storage volume segment which can be filled with the liquid to be injected, such as fuel, is preferably coupled hydraulically to a high-pressure region of the fuel injector via a throttle element, for example a hole throttle.
  • a throttle element for example a hole throttle.
  • the choke formed, for example, as a throttle valve, and the additional storage volume act as a damping element and can be easily adapted, in particular without increasing the outside diameter of the fuel injector, to the requirements to be controlled in terms of vibration technology. Hydraulic pressure oscillations in a fuel injector can be effectively reduced with such an additional storage volume segment.
  • a storage volume segment between the nozzle body and a throttle plate of a fuel injector can be arranged.
  • the length of the fuel injector only slightly extending additional storage volume segment, for example, positioned by elongated positioning pins with respect to the nozzle body and the throttle plate and clamped by a correspondingly extended trained nozzle clamping element, such as a nozzle lock nut, with the entire Injektor said.
  • the additional storage volume segment shown in the embodiments is very close to the place of origin of hydraulic pressure oscillations, such as Nozzle space, arranged and thus has a very good effectiveness.
  • the inventively proposed additional storage volume segment does not increase the outer diameter of the fuel injector, but has a moderate effect on the length of the fuel injector.
  • the inventively proposed storage volume segment can optionally be used on the injector when the vibration behavior of the function or the durability of the same require it.
  • a nozzle tensioning element such as a nozzle retaining nut and positioning pins for the positionally correct positioning of the additional storage volume segment within the fuel injector, are to be adjusted by the additional length thereof; all other components of the fuel injector can be taken over unchanged.
  • a required extension of the fuel injector in the axial direction is of the order of 10 mm and therefore falls very moderately to produce an additional storage volume of 1000 mm 3 .
  • the additional storage volume segment is formed in two parts, a relatively high volume utilization of the available installation space can be achieved with low production costs.
  • an upper part may be formed as a ring part and a lower part as an insert part.
  • the lower part can, for example, be strongly cooled before being inserted into the fuel injector and compressed after heating by the thermal expansion and thus be fixed in position.
  • FIG. 1 The representation according to FIG. 1 is a well-known from the prior art fuel injector, in a partially sectioned view.
  • An in FIG. 1 illustrated fuel injector 1 comprises a holding body 2, to which a perspective connector plug 3 is formed.
  • the in FIG. 1 illustrated fuel injector 1 includes an actuator cartridge which is housed within an actuator bore 11 in the holding body 2.
  • a high-pressure inlet 12 via which a designated by reference numeral 24 control chamber is acted upon by fuel under a system pressure.
  • System pressure is understood below to mean a pressure level that prevails, for example, within a high-pressure reservoir body (common rail) of a high-pressure fuel injection system.
  • the system pressure is generated by, for example, a high-pressure pump or the like.
  • the prevailing in the high-pressure accumulator (common rail) system pressure is via the high-pressure inlet 12, formed in a valve plate 13 bore and a formed in a throttle plate 30 inlet in the control chamber 24 of the fuel injector 1 as shown in FIG FIG. 1 at.
  • the liquid volume from the actuator chamber 11 from the control room Can be recorded, often proves to be too small for effective damping occurring pressure oscillations with respect to a storage effect.
  • the piezoelectric actuator used in the actuator cartridge for actuation of the fuel injector 1 indirectly presses with the interposition of a coupler piston 10 on a valve pin 14 which is biased by means of a valve spring 15. Below the valve pin 14, a channel passes through the throttle plate 30, which communicates hydraulically with the high-pressure region (bypass bore).
  • the holding body 2 of the fuel injector 1, within which the high pressure inlet 12 extends, is connected via a nozzle retaining nut 22 with the nozzle body 20 in connection. Between these, the valve plate 13 and the throttle plate 30 are clamped.
  • valve plate 13 and the throttle plate 30 are clamped.
  • FIG. 2 From the illustration according to FIG. 2 is the hydraulic connection of a damper for damping hydraulic pressure oscillations a storage volume, a storage throttle and a nozzle chamber shown in full.
  • FIG. 3 is the invention proposed to remove integrated into the fuel injector additional storage volume, which is designed as a storage volume segment.
  • FIG. 3 shows that - enclosed by the nozzle retaining nut 22 - a storage volume segment 40 is received between the nozzle body 20 and the throttle plate 30.
  • the two-part storage volume segment 40 comprises an annular upper part 45 and an insert 46 designed as an insert, which are joined together Condition limit the storage volume 42.
  • the storage volume segment 40 is clamped between the throttle plate 30 and an end face of the nozzle body 20.
  • the opening in the valve plate 13 high-pressure inlet 12 extends through the throttle plate 30 and from this through the lower part 46 of the storage volume segment 40.
  • the high-pressure inlet 12 opens into the nozzle chamber 21 of the nozzle body 20.
  • additional storage volume 42 results, which is arranged on the damper throttle 43 in an optimal manner very close to the nozzle chamber 21, in which the hydraulic pulsations in the form of pressure oscillations upon actuation of the preferably needle-shaped injection valve member 23 are induced.
  • an inlet throttle 32 is acted upon. Downstream of the inlet throttle 32, which is formed in the throttle plate 30, extends through the storage volume segment 40, a bore 44 which opens into the control chamber 24 in the nozzle body 20, which is bounded by the control chamber sleeve 25. Furthermore, runs through the storage volume segment 40 - but not in the illustrated sectional plane lying - a throttle bore for a discharge throttle (see reference numeral 48 in the FIGS. 5, 6 and 7 ).
  • the additionally buildable storage volume segment 40 is formed as a component which can be inserted without changes to adjacent components such as the nozzle body 20 and the throttle plate 30 in the immediate vicinity of the nozzle chamber 21 in the Injektorverbund.
  • the storage volume segment 40 Since the storage volume segment 40 is inserted as an additional module between the nozzle body 20 and the throttle plate 30 of the fuel injector 1, the storage volume segment 40 takes over the hydraulic connection between the throttle plate 30 and the nozzle body 20, the nozzle chamber 21 and the control chamber 24. This is in the FIGS. 4 to 7 shown.
  • FIG. 4 shows in enlarged scale the in FIG. 3 in the injector composite contained additional storage volume segment.
  • the storage volume segment 40 is formed substantially from the upper part 45, which is formed as a ring part and the lower part 46, which is an insert part.
  • the upper part 45 and the lower part 46 are preferably joined together during assembly by means of a press fit, so that a contact surface 49 is set up in the interior of the storage volume segment 40.
  • a sealing gap 27 is formed in the region of a second end face 51, which is opposite to the first end face 50 of the storage volume segment 40.
  • first annular groove 41 In the first end face 50 on the upper part 45 extends a semicircular first annular groove 41, which in the plan view in accordance with FIG. 5 is shown in more detail.
  • the first annular groove connects the high-pressure inlet 12 with the bypass bore 31 extending in the throttle plate 30, see. FIG. 3 ,
  • a second annular groove 47 extends, which is formed to extend in a circle.
  • the second annular groove 47 is formed analogously to the underside of the throttle plate 30, which otherwise - in the absence of additional storage volume segment 40 - represents the hydraulic connection to the nozzle body 20.
  • the annularly formed storage volume 42 bounded by the outer wall of the lower part 46 designed as an insert part, and the inner wall of the upper part 45 designed as a ring part, are moved from the bore 44 to the inlet throttle and from the high-pressure inlet 12 traversed.
  • Reference numeral 43 marks the damper throttle point, via which the additional storage volume 42 of the additional storage volume segment 40 is hydraulically connected to the nozzle chamber 21 of the fuel injector.
  • FIG. 5 is a top view of the in FIG. 4 to be taken in sectional view reproduced additional two-part storage volume segment.
  • FIG. 5 shown top view of the storage volume segment 40 can be seen that in the first end face 50, the first annular groove 41 extends semicircular and hydraulically connects the high-pressure inlet 12 with the bypass hole 31. Furthermore, go from the top view FIG. 5 Positioning holes 34, in which in FIG. 5 not shown positioning pins 33 extend.
  • the bore is designated, which extends below the formed in the throttle plate 30 inlet throttle 32 through the storage volume segment 40.
  • Reference numeral 48 denotes the bore, which is connected downstream of the outlet throttle for pressure relief of the control chamber 24.
  • the in FIG. 5 shown top view of the additional storage volume segment 40 is the first end face 50 of the annular part formed as an upper part 45 can be seen.
  • the intersection IV-IV corresponds to the representation of FIG. 4 ,
  • FIG. 6 The representation according to FIG. 6 is the in FIG. 4 Refer to VI-VI sectioning through the storage volume segment.
  • positioning pins are indicated in the also in FIG. 5 already indicated positioning hole 34 are.
  • the lower part 46 can be joined to the upper part 45 by shrinking or by pressing in such a way that the required tightness can be reliably established at the sealing gap 27.
  • the in the sectional view according to FIG. 6 illustrated high-pressure bore 12 provides the connection between the supply line of the fuel to be injected and the Nozzle space 21 ago.
  • the in the sectional plane according to FIG. 4 lying and in FIG. 6 shown in the sectional view bore 44 for the inlet throttle establishes the connection between the inlet throttle in the throttle plate 30 and the control chamber 24 ago.
  • the in the plan view according to FIG. 5 illustrated semicircular first annular groove 41 provides the connection of the bypass hole 31 in the throttle plate 30 with the high-pressure inlet 12 ago.
  • FIG. 7 is a view of the in FIG. 4 shown in section, two-part storage volume segment to be taken from the bottom.
  • the second annular groove 47 is circular.
  • the second annular groove 47 on the second end face 51 encloses the sealing gap 27 concentrically.
  • the bore 44 for the inlet throttle 32, the outlet throttle bore 48 and the damper throttle 43 which in the sectional view FIG. 6 and in the sectional view according to FIG. 4 is shown.
  • the damper throttle 43 are the additional storage volume 42 with the nozzle chamber 21 in conjunction, so that occurring pressure pulsations or pressure oscillations can be attenuated directly in the place of origin.
  • Kinetic energy is converted into heat via the damper throttle 43, which causes the damping of the resulting pressure oscillations in the nozzle chamber 21.
  • the storage volume segment 40 can be optimally adapted to the damping of pressure oscillations or pressure pulsations occurring.
  • Another beneficial effect of the in the FIGS. 4 to 7 The storage volume segment 40 shown in detail is the circumstance that the surface pressure between the throttle plate 30 and the nozzle body 20 can be significantly produced by the first annular groove 41 in the first end face 50 and the second circular annular groove 47 on the second end face 51, resulting in a leakage-free Injektorverbund result.

Claims (9)

  1. Injecteur de carburant (1) pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un corps de retenue (2), une plaque d'étranglement (30) et un corps de buse (20), le corps de retenue (2) et le corps de buse (20) étant en liaison par le biais d'un écrou de serrage de buse (22) et formant ainsi un assemblage d'injecteur précontraint (2, 20, 22), et comprenant un organe de soupape d'injection (23) pouvant être actionné au moyen d'un actionneur (10), de préférence réalisé sous forme de pointeau, qui est reçu dans un espace de buse (21) du corps de buse (20), caractérisé en ce que l'injecteur de carburant (1) comprend un segment de volume de stockage (40) qui fait partie de l'assemblage d'injecteur (2, 20, 22), le segment de volume de stockage (40) contenant un étranglement d'amortissement (43) par le biais duquel un volume de stockage (42) pouvant être stocké dans le segment de volume de stockage (40) est en liaison hydraulique avec l'espace de buse (21) de l'injecteur de carburant (1), de sorte qu'un amortissement des oscillations de pression dans l'espace de buse (21) soit réalisé.
  2. Injecteur de carburant (1) selon la revendication 1, caractérisé en ce que le segment de volume de stockage comprend une partie supérieure (45) et une partie inférieure (46).
  3. Injecteur de carburant (1) selon la revendication 2, caractérisé en ce que le segment de volume de stockage (40) réalisé au moins en une partie comprend une partie supérieure (45) réalisée sous forme de partie annulaire et une partie inférieure (46) réalisée sous forme de partie d'insertion, qui sont assemblées l'une à l'autre au cours d'un ajustement serré (27, 49).
  4. Injecteur de carburant (1) selon la revendication 1, caractérisé en ce que le segment de volume de stockage (40) présente au niveau d'au moins un côté frontal (50, 41) au moins une rainure (41, 47) lesquelles des liaisons hydrauliques (12, 44, 48) sont établies entre l'espace de buse et une plaque d'étranglement (30) reçue dans l'assemblage d'injecteur.
  5. Injecteur de carburant (1) selon la revendication 4, caractérisé en ce que dans le premier côté frontal (50), une première rainure annulaire (41) s'étend en forme de demi-cercle, laquelle relie l'alimentation haute pression (12) à un alésage de dérivation (31) de la plaque d'étranglement (30).
  6. Injecteur de carburant (1) selon la revendication 4, caractérisé en ce qu'au niveau du deuxième côté frontal (51) du segment de volume de stockage (40), en particulier de la partie inférieure (46) réalisée sous forme de pièce d'insertion, s'étend une deuxième rainure annulaire (47) s'étendant sous forme circulaire.
  7. Injecteur de carburant (1) selon la revendication 4, caractérisé en ce que l'alimentation haute pression (12) réalisée dans le corps de retenue (2) s'étend à travers la plaque d'étranglement (30) dans l'alésage (44) qui débouche dans l'espace de commande (24) de l'injecteur de carburant.
  8. Injecteur de carburant (1) selon la revendication 1, caractérisé en ce que l'espace de commande (24) pour l'actionnement de l'organe de soupape d'injection (23) réalisé de préférence sous forme de pointeau est limité par une douille d'espace de commande (25) s'appuyant sur l'organe de soupape d'injection (23) réalisé de préférence sous forme de pointeau.
  9. Injecteur de carburant (1) selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que le volume de stockage (42) du segment de volume de stockage (40) constitue un volume de stockage supplémentaire de l'ordre de 1000 mm3.
EP07115999.0A 2006-11-02 2007-09-10 Injecteur de carburant doté d'un segment de volume de stockage Not-in-force EP1918570B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610051583 DE102006051583A1 (de) 2006-11-02 2006-11-02 Kraftstoffinjektor mit Speichervolumensegment

Publications (3)

Publication Number Publication Date
EP1918570A2 EP1918570A2 (fr) 2008-05-07
EP1918570A3 EP1918570A3 (fr) 2009-09-02
EP1918570B1 true EP1918570B1 (fr) 2017-06-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07115999.0A Not-in-force EP1918570B1 (fr) 2006-11-02 2007-09-10 Injecteur de carburant doté d'un segment de volume de stockage

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EP (1) EP1918570B1 (fr)
DE (1) DE102006051583A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2295787B1 (fr) 2009-07-29 2012-04-04 Delphi Technologies Holding S.à.r.l. Injecteur de carburant
US9897058B2 (en) 2009-07-29 2018-02-20 Delphi International Operations S.A.R.L. Fuel injector
AT509877B1 (de) * 2010-11-02 2011-12-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
DE102014219199A1 (de) * 2014-09-23 2016-03-24 Robert Bosch Gmbh Kraftstoffinjektor
AT515933B1 (de) * 2015-01-02 2016-01-15 Ge Jenbacher Gmbh & Co Og Kraftstoffinjektor
DE102016218669A1 (de) 2016-09-28 2018-03-29 Robert Bosch Gmbh Haltekörper für einen Kraftstoffinjektor, Kraftstoffinjektor mit Haltekörper sowie Verfahren zur Herstellung eines Haltekörpers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2004983A1 (fr) * 2006-04-04 2008-12-24 Robert Bosch GmbH Injecteur de carburant

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815085B1 (fr) * 2000-10-05 2005-07-08 Denso Corp Structure perfectionnee d'injecteur de carburant destinee a eviter l'injection d'une quantite excessive de carburant
WO2003016707A1 (fr) 2001-08-08 2003-02-27 Siemens Aktiengesellschaft Dispositif de dosage
DE10322672A1 (de) * 2003-05-20 2004-12-09 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE102004011095A1 (de) * 2004-03-06 2005-09-22 Robert Bosch Gmbh Kraftstoffeinspritzventil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2004983A1 (fr) * 2006-04-04 2008-12-24 Robert Bosch GmbH Injecteur de carburant

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Publication number Publication date
EP1918570A2 (fr) 2008-05-07
DE102006051583A1 (de) 2008-05-08
EP1918570A3 (fr) 2009-09-02

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