EP1148234B1 - Injecteur de carburant avec surfaces d'étanchéité optimisées - Google Patents

Injecteur de carburant avec surfaces d'étanchéité optimisées Download PDF

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Publication number
EP1148234B1
EP1148234B1 EP01109179A EP01109179A EP1148234B1 EP 1148234 B1 EP1148234 B1 EP 1148234B1 EP 01109179 A EP01109179 A EP 01109179A EP 01109179 A EP01109179 A EP 01109179A EP 1148234 B1 EP1148234 B1 EP 1148234B1
Authority
EP
European Patent Office
Prior art keywords
insert
chamber
valve
housing
injection valve
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.)
Expired - Lifetime
Application number
EP01109179A
Other languages
German (de)
English (en)
Other versions
EP1148234A2 (fr
EP1148234A3 (fr
Inventor
Wendelin Kluegl
Guenter Lewentz
Martin Dr. Neumaier
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1148234A2 publication Critical patent/EP1148234A2/fr
Publication of EP1148234A3 publication Critical patent/EP1148234A3/fr
Application granted granted Critical
Publication of EP1148234B1 publication Critical patent/EP1148234B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to an injection valve according to the preamble of claim 1.
  • Injectors are made up of several sections, whereby sealing surfaces are arranged between the sections, with which lines are limited in which fuel with under high pressure. Furthermore, they are mobile Parts are provided that border on rooms with high pressure, whereby arranged between the parts and a housing sealing gap are. Especially with injectors for diesel fuel injection pressures of up to 2,000 bar have now been reached. At these injection pressures there is an optimized arrangement of the sealing surfaces and sealing gaps necessary to achieve a Avoid leakage through the sealing surfaces or the sealing gaps or decrease.
  • the object of the invention is an injection valve to provide, which is relatively simple and also ensures a high level of reliability in terms of tightness.
  • the object of the invention is achieved by the features of the claim 1 solved. It is advantageous to use the injection valve to provide a recess in which an insert body is introduced is, between the insert body and the housing of the injection valve, a valve chamber is formed in the fuel is led at high pressure. In this way a design with less leakage is achieved.
  • FIG. 1 schematically shows the structure of an injection valve 1.
  • Fig. 2 shows an enlarged section of the injection valve 1 in the area of the control chamber 4.
  • the injection valve 1 has a control chamber 4, which has an inlet throttle 10 is connected to a fuel line 2.
  • the Fuel line 2 is also via a fuel hole 30 in connection with an injection chamber, which is in a nozzle body 31 is arranged at the tip of the injection valve.
  • the Control chamber 4 is in the form of a cylindrical recess in a housing 22 introduced and is limited by a control piston 3.
  • the control piston 3 is movable in the cylindrical recess arranged and is operatively connected to an injection needle.
  • the control chamber 4 has an outlet throttle 5 on, which is guided to a valve chamber 12.
  • the valve chamber 12 is preferably partially in the housing 22 and partially introduced in an insert body 9.
  • the valve chamber 12 is in this embodiment in a first partial chamber 23 and divides a second sub-chamber 24.
  • the first sub-chamber 23 is in the insert body 9 and the second sub-chamber 24 in the housing 22 introduced.
  • the housing 22 has a recess in its upper region 11, which consist of two successive, cylindrical Recesses 33, 34 exist.
  • the first recess 33 has a larger cross section than the second recess 34, the first recess 33 via a step 35 into the second Recess 34 merges.
  • the stage 35 is ring-shaped circumferential contact surface.
  • the second recess 34 merges into a third recess 36, the cross section of which is smaller than that of the second recess 34.
  • the third Recess 36 has a cylindrical shape and is symmetrical arranged to the central axis 49 of the injection valve 1.
  • the third recess 36 is via the outlet throttle 5 with the Control chamber 4 connected.
  • the insert body 9 is inserted into the second recess 34, which has a T-shape in cross section.
  • the insert body 9 consists of a circular plate on a Side provided with a centrally located cylinder piece 45 is.
  • the recess 11 is cylindrical and upwards open towards.
  • the insert body 9 has a central, stepped Bore 25, which is formed continuously.
  • the through bore 25 has the shape of a stepped cylinder bore on.
  • In the upper first area 46 is a guide section formed for a valve piston 7, which in a second area 47 opens out, which has a smaller cross section having. After the second area 47 closes an expanded, third area 48, the cross section corresponds to that of the first area.
  • the valve piston 7 is movably supported.
  • the third area of the bore 25 is symmetrical to the central axis 49 of the injector 1 and has the same diameter as the third recess 36.
  • the third recess 36 and the third region of the bore 25 represent the valve chamber 12.
  • the insert body 9 has on its underside a first sealing surface 18, the one is assigned to the second sealing surface 19 of the housing 22.
  • the second sealing surface 19 is formed by a second step 37, via the second recess 34 into the third Recess 36 merges.
  • the insert body preferably has 9 and / or the housing 22 in the area of the sealing surface 18 or the sealing surface 19 a fourth or fifth recess 50, 51 on.
  • the fourth and fifth recesses 50, 51 have the shape of ring recesses and are symmetrical to the central axis 49 arranged and indicated with dashed lines. Through the fourth and fifth recess 50, 51 is the sealing surface reduced an inner ring area so that an increased Surface pressure is reached.
  • a screw nut 16 is placed on the is screwed with a thread 17 of the housing 22.
  • the Screw nut 16 surrounds the cylinder piece 45 and clamps the Insert body 9 with the first sealing surface 18 on the second Sealing surface 19. This will seal the valve chamber 12 reached.
  • the screw nut 16 is in one piece with the insert body 9 educated.
  • sealants are 53 provided between the first and second sealing surfaces 18, 19, which allow the insert body 9 to be screwed in without that the seal is at risk. For example, an O-ring an annular flat gasket or a cutting ring inserted, as shown in Fig. 5.
  • the nut is 16 - also in one-piece training with the insert body 9 - higher than the insert body 9, so that Housing 43 instead of step 35 on the nut 16 or is brought into contact with the insert body 9. In this Embodiment does not apply to stage 35.
  • a closing member 27 In the valve chamber 12 is a closing member 27 with a Sealing surface 38 arranged.
  • the closing member 27 is one Spring 28 biased against a sealing seat.
  • the sealing seat is in the transition area between the second and the third area 47, 48 of the bore 25 is formed.
  • the valve piston 7 is designed as a stepped valve piston, in the direction of the closing member 27 in a mandrel 26 transforms.
  • the mandrel 26 is in the second area 47 and the cylinder part of the valve piston 7 in the first region 46 of the bore 25 arranged.
  • the mandrel 26 has one at its end plan on first contact surface 40, which plan accordingly assigned second support surface 41 of the closing member 27 is.
  • the valve piston 7 and the closing member 27 set Servo valve 6 represents.
  • the insert body 9 preferably has drainage channels 20, that laterally from the first region 46 of the bore 25 are led outside. Furthermore, the plate of the insert body 9 bevelled at the lower edge, so that between the , Insert body 9 and the housing 22 formed an annular channel 42 is. There are also other designs of the ring channel 42 possible, for example, by an annular gradation of the insert body 9 or by a puncture in the housing 22 being represented.
  • the drain channels 20 are preferably from the bore 25 to the ring channel 42. Furthermore is a Return channel 21 in the housing in the area of the second Recess 34 introduced. With servo valve open 6 fuel flows through the outlet throttle 5, the valve chamber 12, the bore 25, the drainage channels 20, the ring channel 42 and the return channel 21 to a fuel reservoir.
  • the return channel 21 is preferably connected to the ring channel 42.
  • the ring channel 42 can also be in the form of a Undercut, which is attached in the housing 22, formed his.
  • the actuator 8 In the upper area of the housing 22 there is an actuator 8 with a Control plate 13 arranged.
  • the actuator 8 has an actuator housing 43 on that via a screw sleeve 44 in the first recess 33 is clamped, the actuator housing 43 on the Level 35 is present.
  • the control plate 13 has a defined one Distance A to the upper edge of the cylinder piece 45. At the same time, the control plate 13 abuts the valve piston 7. Preferably is a defined when the actuator 8 is not activated Distance between the control plate 13 and the valve piston 7 intended.
  • the actuator 8 is preferably a piezoelectric Actuator designed by a control unit accordingly predetermined control programs can be controlled.
  • the fuel line 2 is fuel with high pressure of both the control chamber 4 via the inlet throttle 10 and an injection space via the fuel bore 30 fed. Pressure areas of an injection needle are in the injection chamber arranged. With the servo valve 6 closed in the control chamber 4, a high pressure on the control piston 3 in the direction of the injection needle. This will the injection needle is pressed onto a sealing seat on the Tip of the nozzle body 31 is formed. So that's one Connection between the injection space and injection holes 32 interrupted.
  • the control unit controls the actuator 8 so that it increases its length and thus the valve piston 7 in the direction of the servo valve 6 adjusted.
  • the cross section of the outlet throttle 5 is larger than that Cross section of the inlet throttle 10.
  • the tip of the injection needle lifts off the sealing seat of the Nozzle body 31 and gives a connection between the injection space and the injection holes 32 free.
  • FIG. 3 shows a further embodiment of the injection valve of Fig. 2.
  • Fig. 3 differs essentially of the embodiment of FIG. 2 in that the valve chamber 12 is arranged completely in the housing 22, wherein on Insert body 9 only the sealing seat 39 of the servo valve 6 is trained. There is therefore no third in the insert body 9 Area 48 of the bore 25 is formed. Furthermore is in the area the transition from the first to the second region 46, 47 one annular groove 52 introduced.
  • the groove 52 serves Fuel coming from the second area 47 despite the guidance of the valve piston 7 in the first area 46 to the drain channel 20 to lead.
  • the groove 52 can be in any embodiment of the 1, 2 and 4 may be introduced.
  • valve 4 shows a further embodiment of the injection valve, 4 being different from the embodiment of FIG. 2 differs in that the valve chamber 12 is completely in the Insert body 9 is formed.
  • the housing 22 no third recess 36 is introduced.
  • the control chamber 4 is connected to the valve chamber 12 via an outlet throttle 5, the discharge throttle 5 to the bottom of the recess 11 is performed.
  • the housing 22 has in the area the second sealing surface 19 is essentially a flat surface on, which is only broken by the flow restrictor 5.
  • the flow restrictor 5 can be graded to a Length of the throttle regardless of the length of the throttle bore adjust.
  • the connection hole is between the control chamber 4 and the valve chamber 12, in one effective throttle part with length D and a remaining part divided, which has no throttling effect. In this way can the length of the throttle 5 regardless of the distance of the control chamber 4 are formed by the valve chamber 12.
  • the Valve chamber 12 is completely inserted in insert body 9, in which the closing member 27 is arranged with the spring 28 is.
  • Figure 5 shows an embodiment corresponding to Figure 2, wherein however, the nut 16 in one piece with the insert body 9 is formed. Furthermore, sealant 53 are between the first and second sealing surfaces 18, 19 are provided, which are ring-shaped and when screwing in of the insert body 9, in which a twisting between the first and second sealing surface 18, 19 occurs, ensure that the valve chamber 12 is securely sealed. Also lies in this embodiment, the actuator housing 43 on the nut 16 on.

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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)

Claims (11)

  1. Injecteur comprenant un boítier (22),
       comportant une cavité (11),
       comportant une chambre de commande (4), et
       comportant un conduit qui, partant de la chambre de commande (4), passe par une chambre de valve (12), une valve qui peut être commandée étant disposée dans la chambre de valve (12),
       caractérisé en ce qu'un corps rapporté (9) est placé dans la cavité (11),
       en ce que le corps rapporté (9) présente une première surface d'étanchéité (18),
       en ce que le boítier (22) présente une seconde surface d'étanchéité (19),
       en ce que, par la première surface d'étanchéité (18), le corps rapporté (9) est appliqué sous précontrainte sur la seconde surface d'étanchéité (19) du boítier (22),
       en ce que le conduit (5, 12, 25) passe dans le corps rapporté (9) en traversant les première et seconde surfaces d'étanchéité (18, 19) et
       en ce que le chambre de valve (12) est délimitée par le corps rapporté (9).
  2. Injecteur suivant la revendication 1, caractérisé en ce que la chambre de valve (12) est ménagée au moins en partie dans le corps rapporté (9).
  3. Injecteur suivant l'une des revendications 1 ou 2, caractérisé en ce que le corps rapporté (9) comporte un guidage de piston (25), en ce qu'un piston de valve (7) est disposé d'une manière mobile dans le guidage de piston (25), en ce que le piston de valve (7) fait saillie dans la chambre de valve (12) et en ce que le piston de valve (5) coopère avec un obturateur (27).
  4. Injecteur suivant l'une des revendications 1 à 3, caractérisé en ce que le corps rapporté (9) est réalisé sous forme d'une plaque comportant un cylindre (45) central, en ce que la première surface d'étanchéité (18) est réalisée sur la face de la plaque qui est située à l'opposé du cylindre (45), en ce qu'il est prévu un écrou fileté (16) qui coopère avec un filetage (17) du boítier (22), en ce que l'écrou fileté (16) comporte une cavité dans laquelle le cylindre (45) est disposé et en ce que l'écrou fileté (16) serre la plaque en appui sur la seconde surface d'étanchéité (19).
  5. Injecteur suivant la revendication 3, caractérisé en ce que, dans le corps rapporté (9), il est ménagé des conduits (20) qui relient le guidage de piston (25) à une sortie (42, 21).
  6. Injecteur suivant l'une des revendications 1 à 5, caractérisé en ce qu'il est prévu un premier perçage (2) qui s'étend suivant un axe (59) dans la chambre de commande (4) et en ce que le premier perçage (2) présente une partie d'étranglement (10) à l'endroit du raccordement à la chambre de commande.
  7. Injecteur suivant la revendication 6, caractérisé en ce qu'il est prévu un second perçage (30), en ce que le second perçage (30) part du premier perçage (2) et s'étend jusqu'à une chambre de pression d'un corps de buse (31) et en ce que le second perçage (30) alimente la chambre de pression en carburant en vue de l'injection.
  8. Injecteur suivant l'une des revendications 1 à 3 et 5 à 7, caractérisé en ce que la cavité (11) est réalisée sous forme d'un cylindre, en ce que le corps rapporté (9) présente une surface extérieure cylindrique et en ce que la surface extérieure comporte un filetage qui coopère avec un filetage du boítier (22).
  9. Injecteur suivant la revendication 8, caractérisé en ce qu'un moyen d'étanchéité (53) est disposé entre la première et la seconde surfaces d'étanchéité (18, 19).
  10. Injecteur suivant la revendication 1, caractérisé en ce que la chambre de valve (12) est disposée totalement dans le corps rapporté (9).
  11. Injecteur suivant la revendication 4 ou 8, caractérisé en ce que la valve est commandée par un actionneur (8) comportant un boítier d'actionneur (43) et en ce que le boítier d'actionneur (43) est en appui sur l'écrou fileté (16) ou le corps rapporté (9).
EP01109179A 2000-04-20 2001-04-12 Injecteur de carburant avec surfaces d'étanchéité optimisées Expired - Lifetime EP1148234B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10019810 2000-04-20
DE10019810A DE10019810A1 (de) 2000-04-20 2000-04-20 Einspritzventil mit optimierten Dichtflächen

Publications (3)

Publication Number Publication Date
EP1148234A2 EP1148234A2 (fr) 2001-10-24
EP1148234A3 EP1148234A3 (fr) 2003-08-13
EP1148234B1 true EP1148234B1 (fr) 2004-06-16

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ID=7639596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01109179A Expired - Lifetime EP1148234B1 (fr) 2000-04-20 2001-04-12 Injecteur de carburant avec surfaces d'étanchéité optimisées

Country Status (2)

Country Link
EP (1) EP1148234B1 (fr)
DE (2) DE10019810A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104160142A (zh) * 2012-03-02 2014-11-19 洋马株式会社 燃料喷射泵

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310123A1 (de) 2003-03-07 2004-09-23 Siemens Ag Radialkolbenpumpe
DE102009007213B4 (de) * 2009-02-03 2017-06-14 Continental Automotive Gmbh Injektorbaugruppe für ein Einspritzventil
DE102011002955A1 (de) * 2011-01-21 2012-07-26 Robert Bosch Gmbh Brennstoffeinspritzventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134978B (en) * 1983-01-20 1987-04-01 Usui Kokusai Sangyo Kk Diesel engine fuel injectors
JP3369015B2 (ja) * 1994-12-15 2003-01-20 株式会社日本自動車部品総合研究所 内燃機関のコモンレール式燃料噴射装置
IT239878Y1 (it) * 1996-12-23 2001-03-13 Elasis Sistema Ricerca Fiat Perfezionamenti ad una valvola di dosaggio a comando elettromagneticoper un iniettore di combustibile.
DE59902966D1 (de) * 1998-07-31 2002-11-07 Siemens Ag Kraftstoffeinspritzventil für brennkraftmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104160142A (zh) * 2012-03-02 2014-11-19 洋马株式会社 燃料喷射泵

Also Published As

Publication number Publication date
EP1148234A2 (fr) 2001-10-24
EP1148234A3 (fr) 2003-08-13
DE10019810A1 (de) 2002-01-31
DE50102573D1 (de) 2004-07-22

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