EP2440770B1 - Soupape d'injection avec unité de transmission - Google Patents

Soupape d'injection avec unité de transmission Download PDF

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Publication number
EP2440770B1
EP2440770B1 EP10722139.2A EP10722139A EP2440770B1 EP 2440770 B1 EP2440770 B1 EP 2440770B1 EP 10722139 A EP10722139 A EP 10722139A EP 2440770 B1 EP2440770 B1 EP 2440770B1
Authority
EP
European Patent Office
Prior art keywords
piston
pot
nozzle needle
injection valve
sleeve
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
EP10722139.2A
Other languages
German (de)
English (en)
Other versions
EP2440770A1 (fr
Inventor
Sven Jaime Salcedo
Michael Knoller
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2440770A1 publication Critical patent/EP2440770A1/fr
Application granted granted Critical
Publication of EP2440770B1 publication Critical patent/EP2440770B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • F02M2200/702—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to an injection valve with a transmission unit according to claim 1.
  • a first piston is passed through a bottom of the pot with a first sealing gap.
  • the second piston is guided in a sleeve portion of the pot with a second sealing gap.
  • One of the pistons is in operative connection with the nozzle needle and the other piston with the actuator. Because of this embodiment, a robust transmission unit is provided, which transmits the deflection of the actuator directly into a deflection of the nozzle needle for a short-term operation and also allows a time-slow change in the volume of the pressure chamber via the sealing gaps.
  • the second piston with a larger end face limits the sealing chamber as an annular surface of the bottom of the pot, through which the first piston is guided. In this way, a translation of the deflection of the actuator is achieved in a larger deflection of the nozzle needle.
  • small deflections of a piezoelectric actuator can be converted into a sufficiently large deflection of the nozzle needle.
  • a spring element is arranged in the sealing chamber, wherein the spring element between the second piston and the bottom of the pot is clamped. In this way it is ensured that the second piston is in contact with a stop of the injection valve and the pressure chamber has a maximum volume. Thus, the operative connection between the actuator and the nozzle needle is precisely defined.
  • the second piston has a sleeve-shaped pot shape, wherein an end of the nozzle needle protrudes into the sleeve-shaped portion of the second piston.
  • the nozzle needle is positively connected via a connecting part with the pot. This allows a simple attachment of the nozzle needle with the pot, wherein also the space is reduced.
  • the connecting element is designed in the form of a partial ring plate which is open on one side and which comprises a notch in the nozzle needle in a central region and is connected to the pot in an outer region, in particular welded. In this way, a simple and secure attachment of the nozzle needle with the pot is made possible.
  • the ring element has recesses, wherein the sleeve-shaped portion of the second piston has free-standing wall sections in a lower end region, the wall sections passing through the recesses are guided and rest on a stop surface. Due to this embodiment, a secure support of the second piston on the stop surface is possible, and also provided an operative connection between the nozzle needle and the pot with little space.
  • the connecting part has a part-annular web whose outer diameter substantially corresponds to the inner diameter of the sleeve-shaped pot, wherein the sleeve-shaped wall of the pot is fitted onto the web and surrounds the web. In this way, an additional fixation of the connecting part is made possible on the pot. Thus, the connection between the connecting part and the pot against mechanical influences is less sensitive.
  • FIG. 1 shows a schematic representation of an injection valve 1, which has a housing 2, at its lower End of a nozzle body 3 is fixed by means of a clamping nut 4.
  • a nozzle needle 5 is movably mounted in the longitudinal direction.
  • the nozzle needle 5 is connected via a transmission unit 6 with an actuator 7 in operative connection.
  • a fuel chamber 8 is formed between the nozzle needle 5 and the nozzle body 3, which is supplied via channels, not shown, with fuel, for example via a fuel reservoir and / or a fuel pump.
  • an annular sealing seat 10 is formed on the inside of the nozzle body 3.
  • the sealing seat 10 is associated with an annular peripheral sealing surface 11 at the lower end of the nozzle needle 5. Depending on the position of the nozzle needle, which is adjusted by the actuation of the actuator 7, the nozzle needle 5 lifts off from the sealing seat 10 and releases a hydraulic connection between the fuel chamber 8 and the injection holes 9.
  • the actuator 7 may be formed, for example, as a piezoelectric actuator or as a magnetic actuator. By an electrical energization of the actuator 7, the actuator 7 extends and thus acts on the transmission unit 6 a.
  • the transmission unit 6 is designed in such a way that the deflection of the actuator 7 is transmitted to the nozzle needle 5.
  • the deflection of the actuator 7 in the direction of the nozzle needle 5 is converted into an opposite movement of the nozzle needle 5 in the direction of the actuator 7 by means of the transmission unit 6.
  • FIG. 2 shows an embodiment of a transmission unit 6, which is arranged between the actuator 7 and the nozzle needle 5 in the housing 2.
  • the transfer unit 6 has a first piston 12, which projects through a bottom 13 of a sleeve-shaped pot 14.
  • the pot 14 is movably mounted.
  • the first piston 12 is fixedly connected to the actuator 7.
  • a second piston 15 is provided, which protrudes from an underside in the sleeve-shaped portion of the pot 14.
  • the second piston 15 is also formed sleeve-shaped, wherein in a sleeve-shaped portion 16 of the second piston 15, an end piece 17 of the nozzle needle 5 protrudes.
  • the end piece 17 is guided through a hole 30 of a stop plate 18, which is firmly clamped to the housing 2.
  • the end piece 17 has a notch 19 into which a connecting part 20 engages.
  • the connecting part 20 is also connected to the sleeve 14, in particular welded, caulked or glued.
  • the second piston 15 is seated with lower edge surfaces 27 on an upper side of the stop plate 18.
  • the top of the stop plate 18 is a stop surface for the second piston 15.
  • the first piston 12 delimits with an end face 28 a pressure chamber 24.
  • the pot 14 defines with an annular surface 29 the pressure chamber 24, the annular surface 29 is formed on the inside of the bottom 13 adjacent to the first piston 12.
  • the first piston 12 is guided through the bottom 13 via a first sealing gap 22.
  • the first sealing gap 22 may have a size in the range of 3 to 15 ⁇ m, in particular in the range of 8 ⁇ m.
  • the second piston 15 is spaced from the inner wall of the sleeve 14 via a second sealing gap 23.
  • the second sealing gap 23 may have a size of 3 to 15 .mu.m, in particular in the range of 8 microns.
  • the first piston 12, the sleeve 14 and the second piston 15 define the pressure chamber 24.
  • the pressure chamber 24 is filled with fuel and communicates via the sealing gaps 22, 23 with the interior of the housing 2, which is also filled with fuel in combination. Between the housing 2 and the transmission unit 6 fuel is arranged at a low pressure. Between a bottom of the stop plate 18 and a second step 25 of the nozzle needle 5, a second spring element 26 is clamped. The second spring element 26 biases the nozzle needle 5 in the direction of the sealing seat 10.
  • the second spring element 26 has a greater spring force than the spring element 21.
  • the annular surface 29 is smaller than the end surface 28. In particular, the annular surface 29 may be half as large as the end surface 28. The area ratio between the annular surface 29 and the end face 28 defines a transmission ratio between the deflection of the actuator and the nozzle needle and can be selected accordingly.
  • the transmission unit 6 works as follows: In the non-activated state of the actuator 7, the nozzle needle 5 is pressed due to the second spring element 26 with the sealing surface 11 on the sealing seat 10. Thus, no fuel can be discharged from the fuel chamber 8 via the injection holes 9.
  • the pressure chamber 24 is filled with fuel.
  • the first and the second piston 12, 15 at a distance.
  • the second piston 15 is supported on the stop plate 18 with the edge surface 27.
  • the first and the second sealing gap 22, 23 are dimensioned so narrow that no change in the volume of the pressure chamber occurs during a brief pressurization, which takes place in the context of injection by the actuator 7. About the first and second sealing gap is ensured that the pressure chamber 24 is always filled with fuel.
  • the actuator 7 pushes the first piston 12 down in the direction of the nozzle needle 5, since the actuator 7 is supported in the upper region against the housing 2.
  • the end face 28 displaces fuel in the pressure chamber 24, whereby the increased fuel pressure on the annular surface 29 engages and the pot 14 moves upward against the direction of movement of the first piston 12.
  • the pot 14 is connected via the connecting part 20 with the nozzle needle 5, so that the nozzle needle 5 is lifted by the movement of the pot 14 from the associated sealing seat 10.
  • fuel can be injected via the injection holes 9.
  • the second spring element 26 is pressed together.
  • the spring element 21 steers, since the distance between the Gradation of the second piston 15 and the annular surface 29 increases.
  • the volume of the pressure chamber 24 is substantially constant during this process.
  • the elongation of the actuator 7 is shortened, so that the first piston 12 is pulled out of the pressure chamber 24 upwards, the pressure in the pressure chamber 24 decreases. Consequently, the pot 14 is moved downward in the direction of the stop plate 18, so that the nozzle needle 5 again comes to rest on the sealing seat 10 with the sealing surface 11. Thus, the injection is interrupted.
  • FIG. 3 shows a partial view of the nozzle needle 5 and the stop plate 18, through the central hole 30, the end piece 17 of the nozzle needle 5 protrudes.
  • the end piece 17 has an annular notch 19, in which the connecting part 20 is inserted laterally.
  • To the left of the stop plate 18, the connecting part 20 is shown in a perspective view.
  • the connecting part 20 is formed as a plate-shaped part, which has the shape of a pitch circle.
  • an insertion opening 31 is introduced, which is guided to the middle of the partial circular disk-shaped connecting part 20.
  • the diameter of the insertion opening 31 substantially corresponds to the diameter of the nozzle needle 5 in the region of the notch 19.
  • the connecting part 20 has three recesses 32.
  • a partial ring-shaped circumferential around a center of the connecting part 20 web 33 is formed.
  • the pressure chamber 24 is supplied with fuel, which is present in the housing of the injection valve.
  • the pressure chamber 24 is thus always filled with fuel.
  • the sealing gaps 22, 23 are selected in such a way that for short time pressure increases that occur during injection processes, the sealing gaps 22, 23 are tight. Prolonged pressure differences lead to an inflow or outflow of fuel into and out of the pressure chamber over the sealing gap, so that the volume of the pressure chamber can change.
  • the connecting part 20 is inserted with the web 33 up into the notch 19, as in the right area of the FIG. 3 is shown.
  • the second piston 15 is attached to the end piece 17 of the nozzle needle 5 for mounting the injection valve, wherein web-like wall portions 34 project through the recesses 32 and the wall portions 34 of the second piston 15 with edge surfaces 27 rest on the stop plate 18, as in FIG. 4 is shown.
  • the spring element 21 is attached to the stepped upper portion of the second piston 15, as in FIG. 5 is shown.
  • the sleeve 14 is pushed onto the second piston 15, as in FIG. 6 is shown.
  • the sleeve 14 is welded in the outer edge region with the connecting part 20, as in cross section of FIG. 7 is shown.
  • the first piston 12 is inserted into an opening 35 of the bottom 13 of the sleeve 14, as in FIG. 2 is shown.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Soupape d'injection (1) pour l'injection de carburant dans un moteur à combustion interne, avec un actionneur (7), avec un pointeau (5), qui est associé à un siège étanche (10), dans lequel il est prévu une unité de transmission (6) qui représente une liaison active entre l'actionneur (7) et le pointeau (5), dans lequel l'unité de transmission (6) présente une chambre sous pression (24), dans lequel la chambre sous pression (24) est limitée par deux pistons mobiles (12, 15), qui sont guidés dans un fourreau mobile (14), dans lequel le premier piston (12) est guidé à travers un fond (13) du fourreau (14) avec une première fente étanche (22), dans lequel le second piston (15) est guidé dans une partie du fourreau (14) en forme de douille avec une seconde fente étanche (23), et dans lequel un piston (12, 15) est en liaison active avec le pointeau (5) et l'autre piston (12, 15) est en liaison active avec l'actionneur (7), caractérisé en ce que la première et la seconde fentes étanches (22, 23) présentent une grandeur comprise dans la plage de 3 à 15 µm, en particulier de l'ordre de 8 µm, de telle manière que lors d'augmentations de pression de courte durée elles soient étanches et lors de différences de pression de plus longue durée elles permettent une entrée ou une sortie de carburant dans ou hors de la chambre sous pression.
  2. Soupape d'injection selon la revendication 1, dans laquelle le premier piston (12) limite la chambre sous pression (24) avec une plus grande face frontale (28) qu'une face annulaire (29) du fourreau (14) adjacente au premier piston (12) .
  3. Soupape d'injection selon une des revendications 1 ou 2, dans laquelle un élément de ressort (21) est disposé dans la chambre sous pression (24), et est placé entre le second piston (15) et le fond (13) du fourreau (14).
  4. Soupape d'injection selon l'une quelconque des revendications 1 à 3, dans laquelle le second piston (15) présente une forme de fourreau en forme de douille, dans laquelle une extrémité (17) du pointeau (5) pénètre dans la partie en forme de douille (16) du second piston (15), dans laquelle le pointeau est fixé par emboîtement au fourreau (14) au moyen d'une pièce de jonction (20).
  5. Soupape d'injection selon la revendication 4, dans laquelle la pièce de jonction (20) est réalisée sous la forme d'une plaque annulaire partielle ouverte sur un côté, qui entoure par emboîtement dans une région médiane une encoche (19) du pointeau (5) et qui est assemblée au fourreau (14) dans une région extérieure.
  6. Soupape d'injection selon la revendication 4 ou 5, dans laquelle la pièce de jonction présente des évidements (32), dans laquelle la partie en forme de douille (16) du second piston (15) présente dans une région d'extrémité inférieure des parties de paroi libres (34), dans laquelle les parties de paroi (34) sont guidées par les évidements (32) et s'appliquent sur une face de butée (18).
  7. Soupape d'injection selon l'une quelconque des revendications 4 à 6, dans laquelle la pièce de jonction (20) présente une nervure en forme d'anneau partiel (33), dont le diamètre extérieur correspond essentiellement au diamètre intérieur de la partie en forme de douille du fourreau (14), et dans laquelle la partie en forme de douille du fourreau (14) est engagée sur la nervure (33).
EP10722139.2A 2009-06-10 2010-06-10 Soupape d'injection avec unité de transmission Not-in-force EP2440770B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009024595A DE102009024595A1 (de) 2009-06-10 2009-06-10 Einspritzventil mit Übertragungseinheit
PCT/EP2010/058132 WO2010142753A1 (fr) 2009-06-10 2010-06-10 Soupape d'injection dotée d'une unité de transmission

Publications (2)

Publication Number Publication Date
EP2440770A1 EP2440770A1 (fr) 2012-04-18
EP2440770B1 true EP2440770B1 (fr) 2018-01-03

Family

ID=42342764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10722139.2A Not-in-force EP2440770B1 (fr) 2009-06-10 2010-06-10 Soupape d'injection avec unité de transmission

Country Status (4)

Country Link
US (1) US8998115B2 (fr)
EP (1) EP2440770B1 (fr)
DE (1) DE102009024595A1 (fr)
WO (1) WO2010142753A1 (fr)

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DE102016109073B4 (de) * 2015-06-05 2022-02-17 Denso Corporation Kraftstoffeinspritzventil und Kraftstoffeinspritzventilcontroller
US9970400B2 (en) 2015-09-15 2018-05-15 Caterpillar Inc. Fuel admission valve for pre-chamber

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Also Published As

Publication number Publication date
EP2440770A1 (fr) 2012-04-18
DE102009024595A1 (de) 2011-03-24
US20120160210A1 (en) 2012-06-28
US8998115B2 (en) 2015-04-07
WO2010142753A1 (fr) 2010-12-16

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