EP2394048A1 - Ensemble d'injection pour un injecteur - Google Patents

Ensemble d'injection pour un injecteur

Info

Publication number
EP2394048A1
EP2394048A1 EP10701021A EP10701021A EP2394048A1 EP 2394048 A1 EP2394048 A1 EP 2394048A1 EP 10701021 A EP10701021 A EP 10701021A EP 10701021 A EP10701021 A EP 10701021A EP 2394048 A1 EP2394048 A1 EP 2394048A1
Authority
EP
European Patent Office
Prior art keywords
chamber
fluid
throttle
module
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.)
Granted
Application number
EP10701021A
Other languages
German (de)
English (en)
Other versions
EP2394048B1 (fr
Inventor
Alexander Kuschel
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 EP2394048A1 publication Critical patent/EP2394048A1/fr
Application granted granted Critical
Publication of EP2394048B1 publication Critical patent/EP2394048B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to an injector assembly for an injection valve, comprising an injector body, with a nozzle needle which is arranged in a recess of the injector body so that it prevents fluid flow through at least one injection opening in a closed position and fluid flow through the injection opening in an open position free. Furthermore, the invention relates to an injection valve having an injector assembly and an actuator unit, wherein the injector assembly and the actuator unit are coupled together.
  • DE 102 20 931 C1 discloses an injector for injecting fuel into a combustion chamber of an internal combustion engine.
  • the injector comprises an injector body, a nozzle needle and a control device in order to control a pressure in a control chamber for actuating the nozzle needle.
  • the injector comprises an inlet throttle and an outlet throttle, which are in hydraulic communication with the control chamber.
  • the inlet throttle and the outlet throttle are arranged in a throttle module formed as a separate component and sealed by means of cutting edges.
  • the object of the invention is to provide an injector assembly and an injection valve, which enables a reliable and precise operation and is designed to save space.
  • the invention is characterized by an injector assembly for an injection valve, with an injector body having a central longitudinal axis and a recess with a fluid inlet, a nozzle needle, which is arranged axially movable in the recess, such that in a closed position of the nozzle needle a fluid flow through at least one injection opening is prevented and otherwise a fluid flow through the injection opening is released, and the nozzle needle has an end face facing away from the injection opening, a chamber formed in the injector body which adjoins an end of the nozzle needle facing away from the injection opening, one in the Chamber arranged throttle module, wherein formed in the throttle module is a hydraulically coupled to the fluid inlet fluid supply chamber, a control chamber hydraulically coupled via an inlet throttle to the fluid supply chamber for setting a pressure force which can be applied to the nozzle needle, and a valve chamber hydraulically coupled to the control chamber via an outlet throttle for receiving a valve which is designed to discharge fluid into a fluid return line, and arranged in the chamber and the
  • a first and a second sealing edge are formed between the throttle module and the injector body and / or the control module.
  • a first sealing edge is a further hydraulic coupling of the fluid supply chamber with the control chamber and by means of the second sealing edge is prevented further hydraulic coupling of the fluid supply chamber with the valve chamber.
  • a third sealing edge is formed, by means of which a hydraulic coupling of the fluid supply chamber is prevented with the fluid return line.
  • the injector assembly together with an actuator unit can form the injection valve.
  • the throttle module can reach small dimensions. This achieves a small axial length of the throttle module and, as a consequence, a small axial extent of the injector assembly. This also small recesses for the throttles in the throttle module are possible. In addition, favorable flow conditions of the fluid in the throttle module and thus a low abrasion of the throttle module can be achieved. A hardening of the throttle module can therefore be omitted. In addition, due to the small number of sealing edges, a high component strength and a lower sensitivity of the throttle module to external mechanical influences can be achieved. The dimensions of the fluid supply chamber, the control chamber and the valve chamber can also be very small, whereby the processing cost of these chambers can be low. Overall, low costs for the throttle module and thus for the entire injector assembly can be achieved.
  • the sealing edges are formed on the throttle module.
  • the throttle module is not overdetermined with respect to its sealing edges.
  • one of the sealing edges on one of the nozzle needle facing axial end of the throttle module and the other of the sealing edges on one of the nozzle needle remote from the axial end of the throttle module is formed.
  • the first sealing edge is formed on the injector body and / or the second sealing edge on the control module.
  • the sealing edges are formed as cutting edges.
  • particularly good sealing properties of the sealing edges can be achieved.
  • the invention is characterized by an injection valve with an actuator unit and an injector assembly according to the first aspect.
  • the actuator unit is coupled to the injector assembly in such a way that the injector assembly can be actuated by means of the actuator unit.
  • FIG. 1 shows a longitudinal section through an injection valve with an injector
  • FIG. 2 is a detail view of the injector assembly in a longitudinal section.
  • FIG. 1 shows an injection valve 10 with an injector assembly 14 and an actuator unit 16.
  • the injector assembly 14 has an injector body 12 with a central longitudinal axis L and a recess 32.
  • the injector body 12 may be made in one piece or in several pieces.
  • a nozzle needle 34 is arranged in the recess 32 of the injector body 12.
  • the nozzle needle 34 may be made in one piece or in several parts.
  • the actuator unit 16 is arranged in the injector body 12.
  • the actuator unit 16 can be designed as a piezoactuator with a stack of piezoelements and its axial extent changes as a function of the applied electrical voltage.
  • the electrical voltage is applied to the actuator unit via a connection socket.
  • the actuator unit 16 is connected to a transformer 20, which is likewise arranged in the injector body 12.
  • the actuator unit 16 and the transmitter 20 form an actuator for the nozzle needle 34.
  • the injector body 12 further comprises a high-pressure port 18, via which the injection valve 10 in the assembled state with a high-pressure circuit, not shown, of a fluid is connected.
  • a chamber 22 is arranged in the recess 32 of the injector body 12.
  • a throttle module 24 and a control module 26 are arranged, the structure and function will be described in detail below.
  • a coupled to the transmitter 20 valve 28 having a valve body 29 and a valve spring 30 is arranged in the throttle module 24 and the control module 26 .
  • the valve 28 may be formed in other (not shown) embodiments without valve spring 30. This applies in particular when the valve body 29 is formed as a ball. If the valve 28 is formed without valve spring 30, then the throttle module 24 may be made very small.
  • fluid return lines 31 are arranged net, which allow a hydraulic connection to a tank, not shown, of the vehicle.
  • the chamber 22 is hydraulically coupled to the fluid return lines 31 or hydraulically decoupled from these.
  • the injection valve 10 further comprises a nozzle body 35, which is connected by means of a nozzle retaining nut 36 with the injector body 12. At the end remote from the actuator unit 16, one or more injection openings 52 are or are arranged in the nozzle body 35.
  • the nozzle needle 34 has an end face 38 facing the chamber 22. In its region facing the at least one injection opening 52, the nozzle needle 34 has a shank portion 44. At its end facing the actuator unit 16, the shank portion 44 of the nozzle needle 34 has a nozzle needle shoulder
  • the nozzle needle shoulder 45 is designed such that the force caused by the pressure of the fluid acts in an opening manner on the nozzle needle 34.
  • a cavity 46 is further formed, which receives a nozzle spring 48, which is supported on the one hand on a shoulder 50 of the cavity 46 and on the other hand, the nozzle needle 34 biased so that it assumes a closed position in which it passes through the fluid flow the at least one arranged in the nozzle body 35 injection opening 52 prevents.
  • the nozzle needle position depends on the force balance of the forces caused by the pressure of the fluid on the nozzle needle hub 45 and on the tip of the nozzle needle 34, and on the other hand, the spring force of the nozzle spring 48 and the force caused by the pressure of the fluid that is in the
  • Chamber 22 is located, and the force caused thereby, which is introduced via the end face 38 of the nozzle needle 34 in the closing direction of the nozzle needle 34.
  • the throttle module 24 is formed substantially cylindrical with a module body 53 and extends in the chamber 22 of the injector body 12 in the direction of the longitudinal axis L.
  • a fluid supply chamber 54 is formed, which is arranged as an annular gap between the body of the throttle module 24 and the injector body 12 and is hydraulically coupled to the fluid inlet 23.
  • the throttle module 24 has a control chamber 56, which forms part of the chamber 22, and via which a pressure force can be applied to the nozzle needle 34 by means of the fluid, by means of the in the closed position of the nozzle needle 34th a fluid flow through the at least one injection opening 52 is prevented and otherwise a fluid flow through the at least one injection opening 52 is released.
  • a valve chamber 58 is formed, in which at least a part of the valve body 29 and the valve spring 30 of the valve 28 are arranged.
  • the fluid supply chamber 54 is hydraulically connected to the control chamber 56 via an inlet throttle 60. Furthermore, between the control chamber 56 and the valve chamber 58, an outlet throttle 62 is arranged in the module body 53 of the throttle module 24, by means of which the control chamber 56 is hydraulically coupled to the valve chamber 58.
  • valve 28 in particular the valve body 29, can be actuated via the actuator unit 60 and can close or release a sealing seat 63 formed on the control module 26.
  • a provision of the valve body 29 is effected by means of the helical spring designed valve spring 30.
  • the return of the valve body 29 is effected by means of a force acting on these hydraulic force.
  • a first sealing edge 64 is formed, namely at one of the nozzle needle 34 facing the axial end of the throttle module 24th It is thus possible to prevent a further hydraulic coupling between the fluid supply chamber 54 designed as an annular gap and the control chamber 56, whereby it is possible via the dimensioning of the inlet throttle 60 to supply fluid to the control chamber 56 and thus, when the valve 28 is closed, to increase the pressure set the control room 56.
  • the first sealing edge 64 is preferably formed as a cutting edge, since thus a particularly good seal between the throttle module 24 and the injector body 12 can be achieved.
  • a second sealing edge 66 is formed between the throttle module 24 and the control module 26.
  • the sealing edge 66 is preferably arranged on an axial end of the throttle module 24 facing away from the nozzle needle 34.
  • a further hydraulic coupling between the fluid supply chamber 54 and the valve chamber 58 can be prevented. This is particularly important when the valve 28 is open, that is, the valve body 29 is lifted from the sealing seat 63. In this case, by means of the second sealing edge 66, an unintentional outflow of the fluid from the fluid supply chamber 54 via the valve chamber 58 to the fluid return line 31 can be avoided.
  • a third sealing edge 68 is formed between the injector body 12 and the control module 26. By means of the third sealing edge 68, a direct hydraulic coupling of the fluid supply chamber 54 with the fluid return line 31 can be prevented.
  • the throttle module 24 Due to the design of the first sealing edge 64 on the axial end of the throttle module 24 facing the nozzle needle 34 and the formation of the second sealing edge 66 on the axial end of the throttle module 24 facing away from the nozzle needle 34, it is possible to design the throttle module 24 very simply. the, since in particular a simple production of the sealing edges 64, 66 is possible. On the other hand, the throttle module 24 with respect to its sealing edges 64, 66 is not overdetermined. This allows relatively high tolerances in the production of the throttle module 24, in particular with respect to the tolerances for the
  • the simple cylindrical design of the throttle module 24 also allows small dimensions of the throttle module 24 and a high component strength. Due to a small axial length of the throttle module 24 and thus a small axial extent of the injector assembly 14, a small axial extent of the entire injection valve 10 is possible. In addition, it is possible, due to the fluid-mechanically favorable arrangement, in particular of the inlet throttle 60 and the outlet throttle 62, to achieve only a slight vortex formation of the fluid in the control chamber 56 and thus a slight abrasive wear of the module body 53 of the throttle module 24. Hardening of the throttle module 24 can therefore be dispensed with.
  • sealing edges 64, 66 By forming the sealing edges 64, 66 as cutting edges good sealing properties of the sealing edges are possible.
  • the actuator unit 16 By activating the actuator unit 16 embodied as a piezoactuator, the actuator unit 16 expands and the valve body 29 is lifted off the sealing seat 63 on the control module 26 via the transformer 20. Thus, a hydraulic connection is released from the control chamber 56 via the valve chamber 58 to the fluid return line 31 and the pressure in the control chamber 56 decreases. Thus, the balance of forces on the nozzle needle 34 is changed such that the nozzle needle 34 in the direction of the actuator 16 in the Control chamber 56 moves in, whereby the at least one injection port 52 is released in the nozzle body 35. If the injection valve 10 is designed as a fuel injection valve, an injection of fuel into a combustion chamber of an internal combustion engine can take place.
  • the actuator unit 16 is deactivated, whereby the valve body 29 again comes into contact with the sealing seat 63 in the control module 26.
  • the hydraulic coupling between the control chamber 56 and the fluid return line 31 is interrupted.
  • the pressure in the control chamber 56 increases, whereby the valve needle 34, optionally with the assistance of the nozzle spring 48, in the axial direction of the actuator unit 16 is moved away.
  • the nozzle needle 34 enters a closed position and the fluid flow through the at least one injection opening 52 is prevented.
  • the support of the nozzle spring 48 for closing the nozzle needle 34 is particularly important during the starting phase of the internal combustion engine and in terms of increased reliability of the closing operation of the nozzle needle 34.
  • the formation of the first and second sealing edge 62, 64 on the throttle module 24 can in particular secure control of the fluid from the fluid supply chamber 54 to the control chamber 56 and from the control chamber 56 via the valve chamber 58 to the fluid return line 31 can be achieved.
  • first sealing edge 64 instead of in the throttle module 24 in the injector body 12
  • second sealing edge instead of in the throttle module 24 in the control module
  • ermodul 26 and the third sealing edge 68 instead of in the injector body 12 in the control module 26 form.

Landscapes

  • 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)
  • Jet Pumps And Other Pumps (AREA)

Abstract

Ensemble d'injection (14) pour un injecteur (10), comportant un corps d'injecteur (12) présentant un évidement (32) doté d'une entrée de fluide (23). La position fermée d'une aiguille d'injecteur (34) mobile dans l'axe obture l'écoulement d'un fluide à travers au moins un orifice d'injection (52) qui s'écoule sinon librement. L'aiguille d'injecteur (34) comporte une face frontale (38) opposée à l'orifice d'injection (52). L'ensemble d'injection (14) comporte une chambre (22) formée dans le corps d'injecteur (12) et contiguë à la face frontale (38) opposée à l'orifice d'injection (52) de l'aiguille d'injecteur (34), un module d'étranglement (24) qui est disposé dans la chambre (22) et dans lequel se trouvent une chambre d'amenée de fluide (54) hydrauliquement couplée à l'entrée de fluide (23), une chambre de distribution (56) hydrauliquement couplée à la chambre d'amenée de fluide (54) par un étranglement d'arrivée (60) pour réguler la force de pression exercée sur l'aiguille d'injecteur (34), et une chambre d'injecteur (58) hydrauliquement couplée à la chambre de distribution (56) par un étranglement de sortie (62) et destinée à recevoir un injecteur (28) qui est conçu pour envoyer un fluide dans une conduite de retour de fluide (31) disposée dans un module de commande (26) voisin du module d'étranglement (24). Entre le module d'étranglement (24) et le corps d'injecteur (12) et/ou le module de commande (26) sont façonnés précisément deux bords d'étanchéité (64,66) qui interdisent d'autres couplages hydrauliques de la chambre d'amenée de fluide (54) avec la chambre de distribution (56) et la chambre d'injecteur (58). Entre le corps d'injecteur (12) et le module de commande (26) est disposé un troisième bord d'étanchéité (68).
EP10701021.7A 2009-02-03 2010-01-25 Ensemble d'injection pour un injecteur Not-in-force EP2394048B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009007213.6A DE102009007213B4 (de) 2009-02-03 2009-02-03 Injektorbaugruppe für ein Einspritzventil
PCT/EP2010/050791 WO2010089217A1 (fr) 2009-02-03 2010-01-25 Ensemble d'injection pour un injecteur

Publications (2)

Publication Number Publication Date
EP2394048A1 true EP2394048A1 (fr) 2011-12-14
EP2394048B1 EP2394048B1 (fr) 2013-08-07

Family

ID=42235239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10701021.7A Not-in-force EP2394048B1 (fr) 2009-02-03 2010-01-25 Ensemble d'injection pour un injecteur

Country Status (5)

Country Link
US (1) US9080538B2 (fr)
EP (1) EP2394048B1 (fr)
CN (1) CN102308080B (fr)
DE (1) DE102009007213B4 (fr)
WO (1) WO2010089217A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007213B4 (de) 2009-02-03 2017-06-14 Continental Automotive Gmbh Injektorbaugruppe für ein Einspritzventil
EP2975257B1 (fr) 2014-07-18 2018-01-10 Continental Automotive GmbH Unité de commande pour commander une tige de soupape d'un injecteur de carburant et injecteur de carburant

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580728B1 (fr) * 1985-04-19 1989-05-05 Alsacienne Constr Meca Systeme d'injection de combustible pour moteur diesel
DE19900037A1 (de) * 1999-01-02 2000-07-06 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE10019810A1 (de) * 2000-04-20 2002-01-31 Siemens Ag Einspritzventil mit optimierten Dichtflächen
DE10038996A1 (de) * 2000-08-10 2002-02-21 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE10111783B4 (de) * 2001-03-12 2005-10-20 Bosch Gmbh Robert Einspritzdüse
DE50214476D1 (de) * 2001-07-03 2010-07-15 Crt Common Rail Tech Ag Brennstoffeinspritzventil für Verbrennungskraftmaschinen
US20050087624A1 (en) * 2002-05-10 2005-04-28 Siemens Aktiengesellschaft Injector for fuel injection
DE10220931C1 (de) 2002-05-10 2003-11-27 Siemens Ag Injektor zur Kraftstoffeinspritzung
DE102008044743A1 (de) 2008-08-28 2010-03-04 Continental Automotive Gmbh Einspritzventil und Fluidzuführsystem mit Einspritzventil
DE102009007213B4 (de) 2009-02-03 2017-06-14 Continental Automotive Gmbh Injektorbaugruppe für ein Einspritzventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010089217A1 *

Also Published As

Publication number Publication date
CN102308080B (zh) 2013-06-19
CN102308080A (zh) 2012-01-04
EP2394048B1 (fr) 2013-08-07
WO2010089217A1 (fr) 2010-08-12
DE102009007213A1 (de) 2010-08-26
DE102009007213B4 (de) 2017-06-14
US20110284667A1 (en) 2011-11-24
US9080538B2 (en) 2015-07-14

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