WO2018091286A1 - Soupape de commande pour injecteur de carburant et injecteur de carburant - Google Patents

Soupape de commande pour injecteur de carburant et injecteur de carburant Download PDF

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Publication number
WO2018091286A1
WO2018091286A1 PCT/EP2017/078165 EP2017078165W WO2018091286A1 WO 2018091286 A1 WO2018091286 A1 WO 2018091286A1 EP 2017078165 W EP2017078165 W EP 2017078165W WO 2018091286 A1 WO2018091286 A1 WO 2018091286A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
control valve
piece
valve piece
injection system
Prior art date
Application number
PCT/EP2017/078165
Other languages
German (de)
English (en)
Inventor
Lars Olems
Richard Rauecker
Helmut Clauss
Matthias Horn
Stephan Amelang
Lorenz Zerle
Christian Faltin
Philipp Wachter
Fabian FISCHER
Oezguer Tuerker
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 WO2018091286A1 publication Critical patent/WO2018091286A1/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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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

  • Control valve for a fuel! injector fuel!
  • the invention relates to a control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system, having the features of the preamble of claim 1.
  • the invention further relates to a fuel injector for a fuel injection system, in particular for a common fuel injection system. Rail injection system, with such a control valve.
  • a fuel injector with a control valve for actuating an injection valve member emerges by way of example.
  • the control valve comprises a liftable closing element, which in the manner with a
  • Valve seat on a valve piece cooperates, that a compound of a control chamber is made with a fuel return or interrupted.
  • a bore is formed, in which a pin is received. Since the diameter of the bore substantially corresponds to the diameter of the valve seat, the control valve in the axial direction is largely pressure balanced.
  • Lifting movement of the closing element may be provided an electromagnet.
  • the closing element in this case forms an anchor or is connected to an anchor.
  • the valve seat facing away from the end face of the armature serves as a stroke stop.
  • connection of a control chamber with a fuel return generally takes place via a drainage channel formed in the valve piece, in which a discharge throttle is arranged. If the outlet throttle is operated cavitating, vapor bubbles can form, which are transported by the fuel into a valve space which is blocked by the valve. Tilerie, the closing element and the pin is limited. Due to an increased static pressure in the valve chamber, the vapor bubbles can implode there and in this way lead to material removal, the so-called cavitation erosion, at the delimiting surfaces.
  • the present invention has for its object to provide a control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system specify, in which the above problems do not occur or only to a significantly reduced extent.
  • control valve with the features of claim 1 is proposed.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a fuel! Njektor proposed with such a control valve.
  • the electromagnetically actuated control valve proposed for a fuel injector in a fuel injection system comprises a valve piece which forms a valve seat for a liftable valve closing element, via the lifting movement of which a drainage channel formed in the valve piece can be connected to a low pressure region, wherein Outflow channel an outlet throttle is formed with a diffuser.
  • an additional throttle point is formed in the outlet channel downstream of the outlet throttle and the diffuser.
  • the diffuser slows the flow locally after the outlet throttle. According to Bernoulli's principle, the slowing down of the flow leads to a pressure increase. As a result, a pressure drop below the vapor limit and thus cavitation is made possible in the outlet throttle. Due to the additional throttle point cavitation can be localized. Because the repeated damming of the flow in the region of the further throttle point favors an imploding of the vapor bubbles in front of the throttle point, so that it is prevented that the vapor bubbles are introduced into the region of the control valve.
  • the further throttle point preferably has no diffuser, but goes without diffuser directly into the drainage channel. This ensures that the cavitation problem is not shifted.
  • valve piece In order to simplify the manufacture of the valve piece, it is proposed that the valve piece is designed in several parts, in particular in two parts. In this way it is possible to form two axially spaced throttle points in a flow channel.
  • the valve piece has at least two parts, which are axially juxtaposed in the region of the outlet throttle, the diffuser or the other throttle point.
  • the outlet throttle, the diffuser or the further throttle point thus come to lie in the region of an end face of a part of the valve piece, so that they are more accessible and therefore easier to manufacture.
  • the two axially juxtaposed parts of the valve piece form a sealing point in the contact area, which is to be sealed against the high pressure in the outlet channel.
  • at least one end face of a part of the valve piece has a sealing contour or sealing surface, which sealingly cooperates sealingly with the end face of the respective other part.
  • the two parts of the valve piece are biased against each other axially.
  • the bias can be effected for example by means of a valve clamping screw.
  • the valve piece has an external thread, by means of which it can be screwed into a holding body of the fuel injector. A separate valve clamping screw is thus unnecessary.
  • an axial preload force can be achieved by means of the screw-in depth of the valve piece in the holding body, which in the case of a multi-part design of the valve piece, the plurality
  • the external thread is arranged in a valve seat near portion of the valve piece. If the valve piece is designed in several parts, in particular in two parts, the part forming the valve seat has the external thread. This ensures that the screw connection over the last te to be mounted part is made.
  • the at least one further part of the valve piece is preferably supported on an axial shoulder of the holding body, which serves as an abutment.
  • the valve piece has an end section with a geometry to which a tool can be attached in a rotationally fixed manner.
  • the geometry may be an external hex.
  • the valve piece has a central elevation for the formation of the valve seat.
  • This allows the formation of an annular seat contour to increase the sealing effect in the region of the valve seat.
  • the survey is frustoconical executed.
  • the valve seat can be conical or flat in this case. In conjunction with an annular sealing contour formed on the valve closing element, a high sealing effect can be achieved in this way.
  • the valve piece forms a plurality of guide elements, which are arranged at the same angular distance from each other around the valve seat and cause a guide of the valve closing element.
  • the guide elements replace a valve piece usually formed hollow cylindrical extension over which the valve closing element is guided. The free spaces between the guide elements allow a largely unhindered outflow of effluent via the flow channel fuel quantity when the control valve is open.
  • a guide of the valve closing element via a magnetic core of an electromagnet, which serves for the actuation of the control valve, or via a set in the magnetic core guide sleeve can be effected.
  • the valve closure member forms a plate-shaped anchor.
  • About the armature can be acted upon by means of an electromagnet on the valve closing element of the control valve.
  • the valve closing element is connected to a plate-shaped anchor.
  • the armature and the valve ßelement can be made in this case of different materials, so that the material of the respective function of a part is optimally adaptable.
  • the valve closure member has a through hole in which an anchor bolt is guided axially movable.
  • the guide area of the anchor bolt seals the high-pressure area against the low-pressure area and is therefore designed with a narrow guide play.
  • a fuel injector for a fuel injection system in particular for a common rail injection system, proposed with a control valve according to the invention for controlling the lifting movement of a liftable nozzle needle, via the lifting movement at least one injection port is releasable and closable. The reduced risk of cavitation or the risk of cavitation erosion increases the robustness of the control valve. This not only increases the lifespan of the
  • Control valve but also the fuel injector. Furthermore, a precise control of the lifting movement of the nozzle needle over the term is ensured.
  • valve piece of the control valve be axially supported on a shoulder of a holding body of the fuel injector.
  • the valve piece can be axially biased by means of a bolted to the holding body valve clamping screw.
  • the valve piece instead of the valve clamping screw, the valve piece itself may be provided with an external thread, so that it can be screwed into the holding body. If the valve piece is designed in several parts, the several parts can be axially prestressed against the shoulder via the part which is in screw connection with the holding body.
  • FIG. 1 is a schematic longitudinal section through an inventive control valve according to a first preferred embodiment and Fig. 2 is a schematic longitudinal section through an inventive control valve according to another preferred embodiment.
  • the electromagnetically actuated control valve shown in FIG. 1 serves to control the lifting movement of a nozzle needle 16. It comprises a fuel element in a holding body 18. Njektors inserted valve piece 1, which is designed in this case in several parts. A first lower part 1.1 forms a within a sleeve-shaped end portion 19 of a control chamber 20 which is bounded by the nozzle needle 16. Accordingly, the control pressure prevailing in the control chamber 20 is loaded on the nozzle needle 16. In order to enable opening of the nozzle needle 16, the control pressure in the control chamber 20 is lowered by opening the control valve.
  • Fuel then flows out of the control chamber 20 via a drain channel 4 formed in the valve piece 1 with a discharge throttle 5 arranged therein into a low-pressure region 21 in order to be discharged from there into a return (not shown).
  • a further part 1.2 of the valve piece 1 is attached axially.
  • the drainage channel 4 also extends through this part 1.2. It opens into a valve seat 2, which in the present case is formed by a frusto-conical elevation 11 of the further part 1.2.
  • the further part 1.2 has an external thread 8, by means of which the further part 1.2 in the holding body 18 of the fuel! screwed njektors.
  • the further part 1.2 presses the first part 1.1 of the valve piece 1 against a shoulder 17 of the holding body.
  • the two parts 1.1, 1.2 are therefore axially biased against each other, which increases the sealing effect in the common contact area.
  • the further part 1.2 has an end section 9 with a geometry 10 in the form of an external hexagon, which enables a rotationally fixed attachment of a tool.
  • valve closing element 3 is provided which is integrally formed in the present case with a plate-shaped armature 13.
  • the valve closing element 3 is penetrated by a through hole 14 in which an anchor bolt 15 is received and guided axially movable.
  • a spring 22 By means of a spring 22, the valve closing element 3 is axially biased against the valve seat 2.
  • a magnetic coil 23 is energized, so that a magnetic field is built up, whose magnetic force pulls the armature 13 including the valve closing element 3 in the direction of a magnetic core 24.
  • Fuel can now flow out of the control chamber 20 into the low-pressure region 21 via the outlet channel 4 and the outlet throttle 5. Since less fuel flows into the control chamber 20 via an inlet throttle 25 than flows via the outlet channel 4 and the outlet throttle 5, the nozzle needle 16 is relieved and opens.
  • the energization of the solenoid 23 is terminated.
  • the valve closing element 3 is returned to the valve seat 2 and the suction valve closes.
  • the control pressure in the control chamber 20 increases because fuel flows in via the inlet throttle 25, but no longer flows out via the outlet channel 4 and the outlet throttle 5.
  • the nozzle needle 16 closes.
  • Trained in the outlet channel 4 drain throttle 5 opens into a diffuser 6, which causes a pressure drop.
  • the diffuser 6 thus increases the risk that vapor bubbles form in the discharge channel 4, which can implode when the pressure suddenly rises again.
  • a further throttle point 7 is formed in the outlet channel 4, which - is connected downstream of the diffuser 6 - at a certain axial distance. Since the outflowing fuel accumulates in front of the further throttle point 7, the additional throttle point 7 counteracts an excessive pressure drop in the discharge channel 4. The risk of cavitation decreases and the robustness of the control valve is increased.
  • FIG. 2 A modification of the control valve of FIG. 1 is shown in FIG. 2.
  • the further part 1.2 of the valve piece 1 forms guide elements 12 for guiding the valve closing element 3.
  • the guide elements 12 are arranged at the same angular distance from each other around the valve seat 2 around.
  • a guide sleeve 26 is inserted, by means of which also a guide of the valve closing element 3 can be reached.
  • the guide elements 12 and / or the guide sleeve 26 are or is optional.

Landscapes

  • 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 une soupape de commande électromagnétique destinée à un injecteur de carburant dans un système d'injection de carburant, en particulier dans un système d'injection à rampe commune, comprenant un élément de soupape (1) qui forme un siège de soupape (2) pour un élément de fermeture de soupape (3) mobile en va-et-vient dont le mouvement de va-et-vient permet de relier un canal de sortie (4) formé dans l'élément de soupape (1) à une partie basse pression (5), un étranglement de sortie (5) muni d'un diffuseur (6) étant réalisé dans le canal de sortie (4). Selon l'invention, un autre point d'étranglement (6) est réalisé dans le canal de sortie (4) en aval de l'étranglement de sortie (5) et du diffuseur (6). L'invention concerne par ailleurs un injecteur de carburant destiné à un système d'injection de carburant, en particulier à un système d'injection à rampe commune, muni d'une soupape de commande selon l'invention.
PCT/EP2017/078165 2016-11-15 2017-11-03 Soupape de commande pour injecteur de carburant et injecteur de carburant WO2018091286A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016222386.0 2016-11-15
DE102016222386.0A DE102016222386A1 (de) 2016-11-15 2016-11-15 Steuerventil für einen Kraftstoffinjektor, Kraftstoffinjektor

Publications (1)

Publication Number Publication Date
WO2018091286A1 true WO2018091286A1 (fr) 2018-05-24

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ID=60202053

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Application Number Title Priority Date Filing Date
PCT/EP2017/078165 WO2018091286A1 (fr) 2016-11-15 2017-11-03 Soupape de commande pour injecteur de carburant et injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102016222386A1 (fr)
WO (1) WO2018091286A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111472906A (zh) * 2020-03-20 2020-07-31 常熟理工学院 燃料喷射阀部件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102007004553A1 (de) * 2007-01-30 2008-07-31 Robert Bosch Gmbh Kugelsitzventil mit verringertem Erosionsverhalten
DE102008044096A1 (de) * 2008-11-27 2010-06-02 Robert Bosch Gmbh Verfahren zur Herstellung von Drosselbohrungen mit niedrigem Kaviationsumschlagpunkt
EP3006723A1 (fr) * 2014-10-08 2016-04-13 Robert Bosch Gmbh Soupape d'injection de carburant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102007004553A1 (de) * 2007-01-30 2008-07-31 Robert Bosch Gmbh Kugelsitzventil mit verringertem Erosionsverhalten
DE102008044096A1 (de) * 2008-11-27 2010-06-02 Robert Bosch Gmbh Verfahren zur Herstellung von Drosselbohrungen mit niedrigem Kaviationsumschlagpunkt
EP3006723A1 (fr) * 2014-10-08 2016-04-13 Robert Bosch Gmbh Soupape d'injection de carburant

Also Published As

Publication number Publication date
DE102016222386A1 (de) 2018-05-17

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