EP1995447B1 - Ensemble de vanne pour soupape d'injection, et soupape d'injection - Google Patents

Ensemble de vanne pour soupape d'injection, et soupape d'injection Download PDF

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Publication number
EP1995447B1
EP1995447B1 EP20070010384 EP07010384A EP1995447B1 EP 1995447 B1 EP1995447 B1 EP 1995447B1 EP 20070010384 EP20070010384 EP 20070010384 EP 07010384 A EP07010384 A EP 07010384A EP 1995447 B1 EP1995447 B1 EP 1995447B1
Authority
EP
European Patent Office
Prior art keywords
cavity
valve
valve body
filter
injection
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.)
Active
Application number
EP20070010384
Other languages
German (de)
English (en)
Other versions
EP1995447A1 (fr
Inventor
Enio Biasci
Federico Zimmitti
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
Priority to DE200760004084 priority Critical patent/DE602007004084D1/de
Priority to EP20070010384 priority patent/EP1995447B1/fr
Publication of EP1995447A1 publication Critical patent/EP1995447A1/fr
Application granted granted Critical
Publication of EP1995447B1 publication Critical patent/EP1995447B1/fr
Active 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

Definitions

  • the invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in widespread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • GB 459 630 A shows a fuel injection nozzle with a filter accomodated therein.
  • injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter and all the various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range.
  • injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or piezoelectric actuator.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example, in the range of up to 200 bar and in the case of a diesel engine in the range of up to 2000 bar.
  • the object of the invention is to create a valve assembly for an injection valve and an injection valve which is simply to be manufactured and which facilitates a reliable and precise function.
  • the invention is distinguished by a valve assembly of an injection valve, the valve assembly comprising a first valve body including a central longitudinal axis and comprising a first cavity, a second valve body being rigidly coupled to the first valve body and comprising a second cavity with a fluid outlet portion, and a valve needle axially movable in the first cavity and the second cavity, the valve needle preventing a fluid flow through the fluid outlet portion of the second cavity in a closing position and releasing the fluid flow through the fluid outlet portion in further positions, the second valve body comprising a passage being arranged between the first cavity and the second cavity directly upstream the second cavity and being designed to enable a fluid flow from the first cavity to the second cavity.
  • a filter is arranged directly upstream or inside the passage and is designed to filter fluid flowing from the first cavity to the second cavity.
  • a spring is arranged and designed to exert a force on the valve needle in axial direction, and is arranged in a part of the first cavity extending away from the filter in direction of the central longitudinal axis.
  • the invention is distinguished by an injection valve comprising the valve assembly of one of the foregoing embodiments.
  • An injection valve 10 ( figure 1 ) that is used as a fuel injection valve for an internal combustion engine, comprises a housing 12, a valve assembly 14 and an actuator unit 16.
  • the housing 12 has a tubular shape.
  • the actuator unit 16 is inserted into a chamber 38 of the housing 12 and comprises a piezo actuator, which changes its axial length depending on a control signal applied to it.
  • the actuator unit 16 may, however, also comprise another type of actuator, which is known to a person skilled in the art for that purpose. Such an actuator may be, for example, a solenoid.
  • the valve assembly 14 is inserted into the housing 12 and comprises a first valve body 20 with a central longitudinal axis A and a first cavity 24 which is axially led through the first valve body 20. Furthermore, the valve assembly 14 comprises a second valve body 21 with a second cavity 25 which is axially led through the second valve body 21.
  • the first valve body 20 and the second valve body 21 are rigidly coupled with each other.
  • valve needle 22 is arranged which is movable in the direction of the central longitudinal axis A.
  • a fluid outlet portion 28 is formed which is closed or open depending on the axial position of the valve needle 22. Outside of the closing position of the valve needle 22 there is a gap between the second valve body 21 and the valve needle 22 at an axial end of the injection valve 10 facing away from of the actuator unit 16. The gap forms a valve nozzle 29.
  • the injection valve 10 is of an outward opening type. In an alternative embodiment the injection valve 10 may be of an inward opening type.
  • the injection valve 10 further has a fluid inlet portion 26 which is arranged in the housing 12 and which is hydraulically coupled to the first cavity 24 and a not shown fuel connector.
  • the fuel connector is designed to be connected to a high pressure fuel chamber of an internal combustion engine; the fuel is stored under high pressure, for example, under the pressure of about 200 bar.
  • a passage 40 is arranged in the second valve body 21 between the first cavity 24 and the second cavity 25.
  • the passage 40 is arranged directly upstream the second cavity 25 and allows a fluid flow from the first cavity 24 to the second cavity 25.
  • a filter 42 is arranged in the first cavity 24 directly upstream the passage 40 .
  • the filter 42 enables to filter the fluid from particles, when the fluid is flowing from the first cavity 24 to the second cavity 25 with the fluid outlet portion 28. Consequently, the valve nozzle 29 can be protected from particles which can cause damages of the second valve body 21 or the valve needle 22 in the area of the valve nozzle 29. Due to its ability to filter particles very near to the valve nozzle 29 it is possible to realize the flow line without the use of further filters. In particular, no filter is needed in the flow line between the fluid inlet portion 26 and the first cavity 24. This allows a simple shape of the first valve body 20 in an area where the fluid enters the first cavity 24.
  • the filter 42 can also be arranged inside the passage 40. This has the advantage that no space for the filter 42 will be needed inside the first cavity 24.
  • the second valve body 21 has a valve body spring rest 32 and the valve needle 22 comprises a valve needle spring rest 34, both spring rests 32, 34 supporting a spring 30 arranged between the second valve body 21 and the valve needle 22.
  • the spring 30 is arranged in a part of the first cavity 24 upstream the filter 42. By this only a small space inside the first cavity 24 is needed for the spring 30. Furthermore, the small size of the spring 30 allows a low-cost solution for the injection valve 10.
  • the spring 30 can be designed to exert only a small force on the valve needle 22. Therefore, the valve needle spring rest 34 can be of a small size as well. This allows a low-cost solution of the valve needle spring rest 34.
  • a bellow 36 is arranged which is sealingly coupling the first valve body 20 with the valve needle 22.
  • a fluid flow between the first cavity 24 and the chamber 38 with the actuator unit 16 is prevented.
  • the bellow 36 is formed and arranged in a way that the actuator unit 16 can cause an axial movement of the valve needle 22.
  • Figure 2 shows a sectional view of the valve assembly 14 with the filter 42.
  • the filter 42 is of a frustro-conical shape and has an inner cavity.
  • the filter 42 is arranged coaxially to the second valve body 21.
  • the filter 42 can also be of a hollow cylindrical shape.
  • the inner cavity of the filter 42 forms an inner surface 46, which is in tight contact with an outer surface 48 of the second valve body 21.
  • the valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in the second valve body 21 in a closing position of the valve needle 22. Outside of the closing position of the valve needle 22, the valve needle 22 enables the fluid flow through the fluid outlet portion 28.
  • the piezoelectric actuator may change its axial length if it gets energized in an expansion duration of some micro-seconds. By changing its length the actuator unit 16 may exert a force on the valve needle 22. The valve needle 22 is able to move in axial direction out of the closing position.
  • the spring 30 can exert a force on the valve needle 22 via the valve needle spring rest 34 towards the actuator unit 16. In the case when the actuator unit 16 is de-energized the actuator unit 16 shortens its length.
  • the spring 30 can force the valve needle 22 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 22 caused by the actuator unit 16 and the force on the valve needle 22 caused by the spring 30 whether the valve needle 22 is in its closing position or not.
  • the second valve body 21 and the first valve body 20 are rigidly coupled, in particular by a press-fitting process.

Landscapes

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

Claims (3)

  1. Assemblage de soupape (14) d'une soupape d'injection (10), l'assemblage de soupape (14) comprenant
    - un premier corps de soupape (20) comprenant un axe central longitudinal (A) et comprenant une première cavité (24),
    - un second corps de soupape (21) couplé de manière rigide au premier corps de soupape (20) et comprenant une seconde cavité (25) avec une partie de sortie de fluide (28), et
    - une aiguille de soupape (22) pouvant être déplacée axialement dans la première cavité (24) et la seconde cavité (25), l'aiguille de soupape (22) empêchant un fluide de s'écouler à travers la partie de sortie de fluide (28) de la seconde cavité (25) en position de fermeture et libérant le fluide à travers la partie de sortie de fluide (28) dans d'autres positions, caractérisé en ce que
    le second corps de soupape (21) comprend un passage (40) ménagé entre la première cavité (24) et la seconde cavité (25) directement en amont de la seconde cavité (25) et conçu pour permettre au fluide de s'écouler de la première cavité (24) à la seconde cavité (25), dans lequel
    un filtre (42) est aménagé directement en amont ou à l'intérieur du passage (40) et est conçu pour filtrer le fluide s'écoulant de la première cavité (24) à la seconde cavité (25).
  2. Assemblage de soupape (14) selon la revendication 1, dans lequel un ressort (30) est aménagé et conçu pour exercer une force sur l'aiguille de soupape (22) dans la direction axiale et disposé dans une partie de la première cavité (24) s'écartant du filtre (42) en direction de l'axe central longitudinal (A).
  3. Soupape d'injection (10) comprenant l'assemblage de soupape (14) selon l'une quelconque des revendications précédentes.
EP20070010384 2007-05-24 2007-05-24 Ensemble de vanne pour soupape d'injection, et soupape d'injection Active EP1995447B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200760004084 DE602007004084D1 (de) 2007-05-24 2007-05-24 Ventilanordnung für ein Einspritzventil und Einspritzventil
EP20070010384 EP1995447B1 (fr) 2007-05-24 2007-05-24 Ensemble de vanne pour soupape d'injection, et soupape d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070010384 EP1995447B1 (fr) 2007-05-24 2007-05-24 Ensemble de vanne pour soupape d'injection, et soupape d'injection

Publications (2)

Publication Number Publication Date
EP1995447A1 EP1995447A1 (fr) 2008-11-26
EP1995447B1 true EP1995447B1 (fr) 2009-12-30

Family

ID=38683586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070010384 Active EP1995447B1 (fr) 2007-05-24 2007-05-24 Ensemble de vanne pour soupape d'injection, et soupape d'injection

Country Status (2)

Country Link
EP (1) EP1995447B1 (fr)
DE (1) DE602007004084D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090256009A1 (en) * 2008-04-10 2009-10-15 Perry Robert B Protection device for a lower guide system of a fuel injector
DE102009027528A1 (de) * 2009-07-08 2011-01-20 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Kraftstoff
DE102011087005A1 (de) 2011-11-24 2013-05-29 Robert Bosch Gmbh Ventil zum Zumessen eines strömenden Mediums
EP3058215B1 (fr) * 2013-10-14 2017-12-27 Continental Automotive GmbH Soupape d'injection
EP3037650B1 (fr) * 2014-12-22 2018-09-12 Continental Automotive GmbH Ensemble de soupape et soupape d'injection de fluide

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB459630A (en) * 1936-03-03 1937-01-12 Saurer Ag Adolph Improvements in and relating to the manufacture of injection nozzles for internal combustion engines
US2986342A (en) * 1959-02-04 1961-05-30 Borg Warner Fuel injection nozzle
DE19835693A1 (de) * 1998-08-07 2000-02-10 Bosch Gmbh Robert Brennstoffeinspritzventil
DE60330844D1 (de) * 2003-05-30 2010-02-25 Continental Automotive Italy S Ventilnadel, Dosiervorrichtung und Kalibrierungsverfahren einer Dosiervorrichtung

Also Published As

Publication number Publication date
DE602007004084D1 (de) 2010-02-11
EP1995447A1 (fr) 2008-11-26

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