WO2011160900A1 - Dispositif d'injection de carburant à coupleur hydraulique - Google Patents

Dispositif d'injection de carburant à coupleur hydraulique Download PDF

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Publication number
WO2011160900A1
WO2011160900A1 PCT/EP2011/058127 EP2011058127W WO2011160900A1 WO 2011160900 A1 WO2011160900 A1 WO 2011160900A1 EP 2011058127 W EP2011058127 W EP 2011058127W WO 2011160900 A1 WO2011160900 A1 WO 2011160900A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection device
nozzle needle
control piston
guide
control
Prior art date
Application number
PCT/EP2011/058127
Other languages
German (de)
English (en)
Inventor
Peter Baumgartner
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 WO2011160900A1 publication Critical patent/WO2011160900A1/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
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a fuel injection device, also referred to as a fuel injector, for an internal combustion engine, having a valve element which is constructed in several parts and integrated in a housing and a nozzle body.
  • the valve element comprises a control piston and a nozzle needle. These components, the control piston and the nozzle needle, are connected within a high-pressure chamber via a hydraulic coupler.
  • the control piston communicates with a control chamber, which can be controlled by a control valve, connected to a low pressure or return system.
  • a fuel injection takes place via an outlet opening in that the nozzle needle lifts off from a valve seat or causes a closure of the nozzle needle.
  • Fuel injection devices are generally known, with which a diesel or gasoline fuel is injected directly into a combustion chamber of an internal combustion engine.
  • a valve element is arranged in a housing, which in the region of a fuel outlet opening has a pressure surface acting overall in the opening direction of the valve element.
  • control surface is present, which limits a control chamber.
  • hydraulic vibrations between the common rail formed as a high-pressure accumulator and the injection device can occur. Such vibrations have an adverse effect on the course of injection, in particular in the case of multiple injection, and on the wear of the nozzle needle or the injector.
  • DE 10 2006 026 877 A1 it is known from DE 10 2006 026 877 A1 to provide within the housing an additional storage volume which damps vibrations.
  • a generic fuel injection device is known from WO 2007/098975 A1.
  • a control chamber which interacts with a control or coupler piston via a control surface, is actuated by a control valve.
  • the control piston is guided at the end remote from the control chamber in a guide element and supported directly on the nozzle needle inserted in a nozzle needle within a coupler space of the guide member.
  • a high fuel pressure provided by a common rail is present in a region of the pressure surface acting in the opening direction and in the closing direction of the control surface.
  • the pressure applied to the control surface is lowered until the hydraulic force resultant acting in the opening direction exceeds the force acting on the pressure surface in the closing direction in order to bring about opening of the nozzle needle.
  • Object of the present invention is to provide a comparison with known devices improved fuel injector, which is constructed as possible optimized component and easy to install.
  • a hydraulic coupler with a guide body for a fuel injection device, which comprises a hydraulically tightly clamped between the housing and the nozzle body base disk.
  • a central opening is integrated to guide the nozzle needle and the control piston or the coupler piston, in each of which a guide collar of the nozzle needle and the control piston engage in a form-fitting manner.
  • the hydraulic coupler comprises a first annulus, which differs from the base disc, the guide collar, a control surface and a separate sliding sleeve of the control piston is limited.
  • a second annular space of the hydraulic coupler, which is connected via at least one leakage gap with the first annular space is bounded by the base disk, including directly associated guide bushing and a control surface and the guide collar of the nozzle needle.
  • the guide bush connected in one piece with the base disk comprises an inner diameter which is larger than the central opening for the guide collar and encloses the nozzle needle on the outside with limited lengths.
  • the invention By integrated in the base disc opening for guiding the control piston and the nozzle needle accounts for previously known solutions various components, such as an additional disc or spring, which advantageously adjusts a component-optimized structure of the hydraulic coupler.
  • the invention provides a simplified component and space-optimized design, which leads to a cost-effective production of the valve element.
  • components of previous devices can advantageously be used to implement the present invention. Due to the reduced component circumference and the strained directly between the housing and the nozzle body base plate also simplifies the assembly. Thus, a significant cost advantage can be realized by the fuel injection device according to the invention.
  • the hydraulic coupler for realizing a path translation and reversal of the direction of travel, according to the invention, also includes the advantages of previous solutions, such as a centric, leak-free, function-enhancing high-pressure volume. This results in advantages in terms of manufacturing, such as the simple introduction of the central opening in the base disk. Furthermore, the strength of the hydraulic valve element improves due to elimination of critical intersections of high pressure bores, which has an advantageous effect on the function and life of the fuel injector.
  • the fuel injection device according to the invention is further characterized by a high efficiency, as compared to previous devices between the valve element and the housing leaks no longer occur.
  • the structure according to the invention allows a simplified adaptation or compensation of manufacturing tolerances, which advantageously improve the injector function.
  • the two-chamber coupler according to the invention provides an increased internal storage volume which prevents the occurrence of adverse hydraulic oscillations between the fuel injector and the high pressure port, a common rail. These vibrations or pressure waves have a negative influence on the course of injection, in particular in the case of multiple injections and the wear of the nozzle needle on the valve seat. In addition, the accuracy of the injection quantity increases with multiple injections.
  • the hydraulic coupler of two separate components of the valve element increases the degree of freedom in the design of the fuel injection device.
  • the valve element is preferably designed with an almost matching pressure surface and control surface in order to be able to realize pressure equalization with correspondingly high dynamics.
  • a separate, linearly displaceable, the control piston enclosing sliding sleeve or control sleeve is provided to form the second annular space of the hydraulic coupler.
  • the control sleeve enclosing the sliding sleeve is acted upon by a spring means, in particular a compression spring and is non-positively and sealed supported by a sealing seat on the base disc of the guide body.
  • a spring means in particular a compression spring and is non-positively and sealed supported by a sealing seat on the base disc of the guide body.
  • the sliding sleeve can additionally perform a switching function in that the sliding sleeve lifts off from the sealing seat when the overpressure in the first annular space of the hydraulic coupler is greater than the pressure in the high-pressure space.
  • the sliding sleeve on the inside comprises a radially stepped portion which is widened relative to the control piston and which has an annular hydraulic
  • the sliding sleeve is largely guided centrally on a guide section axially spaced from the end faces of the sliding sleeve on the control piston.
  • the sliding sleeve has added to the guide section an enlarged inner diameter. This measure ensures a production-related tolerance compensation and ensures a closed annular abutment of the sliding sleeve on the sealing seat of the base plate, to achieve an effective seal.
  • the hydraulically effective pressure and / or control surfaces of the valve element are dimensioned differently.
  • the response of the hydraulic coupler or the operation of the valve element can be directly influenced, for example, to realize a different actuating speed between the control piston and the nozzle needle.
  • it makes sense to interpret the hydraulically effective control surfaces of the annular spaces of the hydraulic coupler deviating from each other.
  • the size of these annular spaces is determined directly by the diameter of the control piston and the nozzle needle.
  • Diameter of the guide collars of the control piston and the nozzle needle determined.
  • a preferred design provides to use a control piston whose diameter exceeds the diameter of the nozzle needle. This measure causes a faster response of the control piston to the nozzle needle at the beginning of the fuel injection.
  • the hydraulic coupler acts with open nozzle needle as a closing direction in the hydraulic spring, which assists a safe closing of the nozzle needle.
  • Another design criterion of the hydraulic coupler relates to the guided in the base disc guide collars, which are tailored, inter alia, to the component thickness of the base disc.
  • the guide collar length exceeds the respective travel of the associated component by an amount that ensures safe guidance of the control piston and the nozzle needle in the opening of the base disc. In the case of travel paths that occur differently, it is advisable, for example, for a guide collar length of the control piston to exceed a guide collar length of the nozzle needle.
  • the central opening of the base disc of the guide body has at least one longitudinal groove.
  • the nozzle needle engages with a guide collar designed as a polygonal profile in the central opening of the base disk. It is also advantageous to provide the guide collar of the control piston with a corresponding polygonal profile.
  • the base disk of the guide body is clamped hydraulically tight between the housing and the nozzle body.
  • the base disk is enclosed on the outside directly by a clamping nut which joins the housing and the nozzle, whereby no disadvantageous misalignment of the valve element occurs.
  • the base disk within the second annular space forms a stroke stop, which advantageously surrounds the edge zone of the central opening. For targeted influence on the injection quantity, it is advisable to additionally introduce a travel of the nozzle needle limiting Hubeinstell committee.
  • FIG. 1 shows a fuel injection device with hydraulic coupler, according to a preferred embodiment
  • 2 shows a detail "X" of the fuel injection device, according to Figure 1 in an enlarged view.
  • the injection device 1 which also as fuel! may be referred to, comprises a valve element 2, which is arranged displaceably in a housing 3 and in a nozzle body 4.
  • a high-pressure pump not shown in FIG. 1 conveys the diesel or petrol fuel from a reservoir into a high-pressure connection 5, also referred to as a common rail, to which a plurality of injection devices 1 are connected, via which the fuel can be injected directly into associated combustion chambers of an internal combustion engine.
  • the injection device 1 is connected via a switching valve 6 with a low pressure port 7 and a subsequent fuel reservoir.
  • the valve element 2 comprises a guided in the housing 3, also referred to as a coupler piston control piston 8 and a nozzle needle 9, which are connected via a hydraulic coupler 10.
  • the structure of the coupler 10 includes a guide body 12, consisting of a base plate 1 1 inserted between the housing 3 and the nozzle body 4, which is clamped hydraulically tight by means of a clamping nut 43.
  • a guide body 12 consisting of a base plate 1 1 inserted between the housing 3 and the nozzle body 4, which is clamped hydraulically tight by means of a clamping nut 43.
  • the control piston 8 and the nozzle needle 9 are each guided over a guide collar 14,15.
  • the nozzle needle 9 is further guided in an integrally connected to the base disc 1 1 guide bush 16.
  • a separate, the control piston 8 enclosing, acted upon by a spring means 18 sliding sleeve 17 is frictionally supported by a sealing seat 19 on the base plate 1 1.
  • the hydraulic coupler 10 forms two at least via a leakage gap 32 connected annular spaces 20,21.
  • a first annular space 20 is delimited by the base disk 11, the guide collar 14, a control surface 22 and the separate sliding sleeve 17 of the control piston 8.
  • the second annular space 21 is limited by the base disk
  • the guide disc 16 directly associated with the base plate 1 1, which has a larger, the nozzle needle 9 limited enclosing inner diameter compared to the central opening 13 of the base disc 1 1.
  • a further delimitation of the second annular space 21 is effected by a control surface 23 and the guide collar 15 of the nozzle needle 9.
  • the control piston 8 is guided with an enlarged piston diameter in a sleeve 25 assigned to an end body 24, which to confine a control room 26 together.
  • the connection to the high-pressure connection 5 is interrupted and a connection to the low-pressure connection 7 is established, connected to a pressure drop in the control chamber
  • FIG. 2 shows the detail "X" of the injection device 1 according to FIG. 1 on an enlarged scale and in particular clarifies the structure of the hydraulic coupler 10. To achieve a more rapid pressure and volume compensation between the annular spaces 20, 21, it closes in the base disk 1 1 integrated opening 13 for receiving the guide collars 14, 15 at least one longitudinal groove 42.
  • the guide collar 15 of the nozzle needle 9 is formed as a polygonal profile, for example as a square Diameter D 2 of the nozzle needle 9, which correspondingly differentiates the hydraulically actuated control surfaces 22, 23 of the annular spaces 20, 21.
  • This design accelerates the response, the adjusting movement of the control piston 8 after energizing the switching valve 6.
  • a stepped section 31 pointing to the sealing seat 19 , a radial step of the sliding sleeve 17 with the diameter R D 3 forms a hydraulically loadable annular surface, which allows for pressure peaks occurring within the annular space 20, an overpressure against the Hochdruckdraum 33 lifting the sliding sleeve 17 of the base plate 1 1.
  • a flow throttle 45 is integrated in the fluid passage 34 of the base disk 11.
  • the diameter D 4 of the annular space 21 exceeds the diameter D 2 of the nozzle needle 9, and thus ensures an unimpeded adjusting movement of the nozzle needle 9 within the annular space 21st
  • a stroke stop 44 is provided for the nozzle needle 9 within the annular space 21 on the base plate 1 1.
  • the lengths Si and S 2 of the guide collars 14, 15 are different, which are chosen in coordination with the base plate thickness so that in all positions of the valve element 2, both the control piston 8 and the nozzle needle 9 in the base plate 1 1 is sufficiently performed.

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

Abstract

L'invention concerne un dispositif d'injection de carburant d'un moteur à combustion interne, ledit dispositif présentant un élément de soupape (2) réalisé en plusieurs parties, qui est guidé en déplacement et intégré dans un carter (3) et un corps d'injecteur (4) et qui comprend un piston de commande (8) et un pointeau (9) reliés à l'intérieur d'une chambre à haute pression (33) au moyen d'un coupleur hydraulique (10). Le piston de commande (8) associé à une chambre de commande (26) peut être relié par l'intermédiaire d'une soupape de commutation (6) à un branchement haute pression (5) ou à un branchement basse pression (7). En fonction d'une position de commande de la soupape de commande (6), le pointeau (9) se décolle d'un siège de soupape (41) pour l'injection de carburant, ou ferme le siège de soupape (41). Le coupleur hydraulique (10) comprend un corps de guidage (12), constitué d'un disque de base (11) contraint de manière hydrauliquement étanche entre le carter (3) et le corps d'injecteur (4) et pourvu d'une ouverture centrale (13) dans laquelle le pointeau (9) et le piston de commande (8) sont guidés au moyen d'une embase de guidage respective (14, 15). Le coupleur hydraulique (10) forme une première chambre annulaire (20) qui est délimitée par le disque de base (11), l'embase de guidage (14), une surface de commande (22) et un manchon coulissant séparé (17) du piston de commande (8). Une seconde chambre annulaire (21), reliée à la première chambre annulaire (20) par un interstice de fuite (32), est délimitée par le disque de base (11), y compris la douille de guidage (16) directement associée, ainsi que par une surface de commande (23) et par l'embase de guidage (15) du pointeau (9).
PCT/EP2011/058127 2010-06-23 2011-05-19 Dispositif d'injection de carburant à coupleur hydraulique WO2011160900A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010030383 DE102010030383A1 (de) 2010-06-23 2010-06-23 Kraftstoffeinspritzvorrichtung mit hydraulischem Koppler
DE102010030383.6 2010-06-23

Publications (1)

Publication Number Publication Date
WO2011160900A1 true WO2011160900A1 (fr) 2011-12-29

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PCT/EP2011/058127 WO2011160900A1 (fr) 2010-06-23 2011-05-19 Dispositif d'injection de carburant à coupleur hydraulique

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DE (1) DE102010030383A1 (fr)
WO (1) WO2011160900A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104350269A (zh) * 2012-03-07 2015-02-11 罗伯特·博世有限公司 用于计量流体的阀
EP3358178A1 (fr) * 2017-02-07 2018-08-08 Robert Bosch GmbH Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007098975A1 (fr) 2006-02-24 2007-09-07 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur a combustion interne
DE102006026877A1 (de) 2006-06-09 2007-12-13 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
EP1911966A2 (fr) * 2006-10-10 2008-04-16 Robert Bosch Gmbh Injecteur de carburant pour un moteur à combustion interne
EP1936180A2 (fr) * 2006-12-21 2008-06-25 Robert Bosch Gmbh Soupape d'injection de combustible

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007098975A1 (fr) 2006-02-24 2007-09-07 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur a combustion interne
DE102006026877A1 (de) 2006-06-09 2007-12-13 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
EP1911966A2 (fr) * 2006-10-10 2008-04-16 Robert Bosch Gmbh Injecteur de carburant pour un moteur à combustion interne
EP1936180A2 (fr) * 2006-12-21 2008-06-25 Robert Bosch Gmbh Soupape d'injection de combustible

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104350269A (zh) * 2012-03-07 2015-02-11 罗伯特·博世有限公司 用于计量流体的阀
EP3358178A1 (fr) * 2017-02-07 2018-08-08 Robert Bosch GmbH Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique

Also Published As

Publication number Publication date
DE102010030383A1 (de) 2011-12-29

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