EP2003331A1 - Ventilanordnung für ein Einspritzventil und Einspritzventil - Google Patents

Ventilanordnung für ein Einspritzventil und Einspritzventil Download PDF

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Publication number
EP2003331A1
EP2003331A1 EP07011514A EP07011514A EP2003331A1 EP 2003331 A1 EP2003331 A1 EP 2003331A1 EP 07011514 A EP07011514 A EP 07011514A EP 07011514 A EP07011514 A EP 07011514A EP 2003331 A1 EP2003331 A1 EP 2003331A1
Authority
EP
European Patent Office
Prior art keywords
valve
collar
needle
injection
valve body
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.)
Withdrawn
Application number
EP07011514A
Other languages
English (en)
French (fr)
Inventor
Antonio Paciolla
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.)
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
Priority to EP07011514A priority Critical patent/EP2003331A1/de
Publication of EP2003331A1 publication Critical patent/EP2003331A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188

Definitions

  • the invention relates to a valve assembly for an injection valve and an injection valve for a combustion chamber of a combustion engine.
  • 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.
  • 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.
  • a valve assembly for an injection valve comprising a valve body including a central longitudinal axis, the valve body comprising a cavity forming an inner wall, the cavity comprising a fluid outlet portion with a seat area being part of the inner wall, a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow in a fluid flow direction through the fluid outlet portion in further positions, the valve needle comprising a needle seat, the needle seat and the seat area forming an injection nozzle, and a collar being coupled to an outer surface of the valve body and extending in axial direction of the valve body relative to the central longitudinal axis, wherein the collar is arranged circumferentially relative to the central longitudinal axis to encircle the injection nozzle.
  • the collar is circumferentially closed. This has the advantage that a good protection of the injection nozzle against mechanical damage in all directions is possible.
  • the radial extension of the collar is decreasing in the fluid flow direction.
  • valve needle has an axial valve needle end and the collar has an axial collar end, and the axial collar end ranges at least to a common plane comprising the axial valve needle end and extending in a radial direction relative to the central longitudinal axis.
  • valve body and the collar are formed as a one-part element.
  • the invention is distinguished by an injection valve for a combustion chamber of a combustion engine with a valve assembly according to the first aspect of the invention.
  • 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 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 comprises a valve body 20 with a central longitudinal axis L and a cavity 24 which is axially led through the valve body 20. On one of the free ends of the cavity 24, a fluid outlet portion 28 is formed, which is closed or open depending on the axial position of a valve needle 22.
  • 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 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.
  • the valve body 20 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 valve body 20 and the valve needle 22.
  • 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.
  • a bellow 36 is arranged which is sealingly coupling the valve body 20 with the valve needle 22. By this a fluid flow between the cavity 24 and a chamber 38 is prevented. Furthermore, the bellow 36 is formed and arranged in a way that the valve needle 22 is actuable by the actuator unit 16.
  • Figure 2 shows a sectional view of the valve assembly 14 with a collar 40.
  • Figure 3 shows the collar 40 and the valve needle 22 in a longitudinal section in an enlarged detailed view.
  • the cavity 24 of the valve body 20 forms an inner wall 42.
  • a seat area 44 which is part of the inner wall 42 of the cavity 24 and a needle seat 46 of the valve needle 22 is forming an injection nozzle 29.
  • the collar 40 is arranged on an outer surface 48 of the valve body 20.
  • the collar 40 and the valve body 20 are separate parts.
  • the collar 40 is coupled to the valve body 20 by well-known processes, for example by a press-fitting process.
  • the collar 40 is in one part with the valve body 20. This has the advantage that the collar 40 can be manufactured together with the valve body 20. Furthermore, a good coupling between the valve body 20 and the collar 40 can be obtained.
  • the collar 40 is extending in a direction of the longitudinal axis L and the collar 40 is surrounding the injection nozzle 29 and parts of the valve needle 22. By this the injection nozzle 29 can be protected against mechanical damage, in particular during the assembly of the injection valve 10 into the internal combustion engine.
  • the collar 40 is circumferentially closed so that the injection nozzle 29 can be protected against mechanical damages in all radial directions, in particular during the assembly of the injection valve 10 into the internal combustion engine.
  • the collar 40 can have interruptions in circumferential direction.
  • the embodiment of the collar 40 of the figures 2 and 3 shows that the radial extension of the collar 40 decreases in a fluid flow direction F.
  • a fluid spray 54 which can leave the injection valve 10 via the injection nozzle 29 has a direction component in a radial direction R relative to the longitudinal axis L
  • this shape of the collar 40 makes it possible that the fluid spray 54 remains undisturbed by the collar 40 but enables the protection of the injection nozzle 29 against mechanical damage in a secure manner without changing the maximum of the outer diameter of the valve body 20.
  • this design of the collar 40 results in that the collar 40 is mechanically very robust.
  • the valve needle 22 has an axial valve needle end 50.
  • the collar 40 has an axial collar end 52.
  • the axial valve needle end 50 and the axial collar 52 are arranged in a common plane P which extends in the radial direction R relative to the central longitudinal axis L.
  • the collar 40 extends beyond the axial valve needle end 50 in the fluid flow direction F.
  • the fuel is led from the fluid inlet portion 26 in the housing 12 to the cavity 24 of the valve body 20 and then to the fluid outlet portion 28.
  • the valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in the valve body 20 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 in the fluid flow direction F.
  • 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 effect a force on the valve needle 22. By this the valve needle 22 is able to move in axial direction out of the closing position. Outside of the closing position of the valve needle 22 there is a gap between the seat area 44 of the valve body 20 and the needle seat 46 of the valve needle 22 at an axial end of the injection valve 10 facing away from of the actuator unit 16. The gap forms the injection nozzle 29.
  • the spring 30 can force 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. By this 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 fluid flows through the injection nozzle 29 to form the fluid spray 54.
  • the radial extension of the collar 40 is decreasing in the fluid flow direction thereby forming a conical-shaped inner wall 56 of the collar 40 the fluid spray 54 can leave the injection nozzle 10 without touching the collar 40. This enables that the collar 40 can protect the injection nozzle 29 against mechanical damages in particular during the process of assembling the injection valve 10 to the internal combustion engine without disturbing the desired pattern of the fluid spray 54.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP07011514A 2007-06-12 2007-06-12 Ventilanordnung für ein Einspritzventil und Einspritzventil Withdrawn EP2003331A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07011514A EP2003331A1 (de) 2007-06-12 2007-06-12 Ventilanordnung für ein Einspritzventil und Einspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07011514A EP2003331A1 (de) 2007-06-12 2007-06-12 Ventilanordnung für ein Einspritzventil und Einspritzventil

Publications (1)

Publication Number Publication Date
EP2003331A1 true EP2003331A1 (de) 2008-12-17

Family

ID=38863113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07011514A Withdrawn EP2003331A1 (de) 2007-06-12 2007-06-12 Ventilanordnung für ein Einspritzventil und Einspritzventil

Country Status (1)

Country Link
EP (1) EP2003331A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2218905A1 (de) * 2009-02-17 2010-08-18 Continental Automotive GmbH Injektor und Verfahren zum Einspritzen von Fluid
CN105275696A (zh) * 2015-11-12 2016-01-27 余姚市舒春机械有限公司 船用大功率柴油机喷射装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015429A (en) * 1961-11-04 1965-12-31 Olivier Breting Improvements in or relating to fuel injectors for internal combustion engines
JPS60190663A (ja) * 1984-03-12 1985-09-28 Toyota Motor Corp 内燃機関の燃料噴射弁
JPS62248867A (ja) * 1986-04-21 1987-10-29 Nippon Denso Co Ltd 燃料噴射弁
WO2003038272A1 (de) * 2001-10-24 2003-05-08 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1467087A1 (de) * 2003-04-09 2004-10-13 Siemens VDO Automotive S.p.A. Sprühmusterelement und Kraftstoffeinspritzventil mit demselben
EP1655482A1 (de) * 2004-11-04 2006-05-10 Siemens Aktiengesellschaft Ventil zum Einspritzen von Brennstoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015429A (en) * 1961-11-04 1965-12-31 Olivier Breting Improvements in or relating to fuel injectors for internal combustion engines
JPS60190663A (ja) * 1984-03-12 1985-09-28 Toyota Motor Corp 内燃機関の燃料噴射弁
JPS62248867A (ja) * 1986-04-21 1987-10-29 Nippon Denso Co Ltd 燃料噴射弁
WO2003038272A1 (de) * 2001-10-24 2003-05-08 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1467087A1 (de) * 2003-04-09 2004-10-13 Siemens VDO Automotive S.p.A. Sprühmusterelement und Kraftstoffeinspritzventil mit demselben
EP1655482A1 (de) * 2004-11-04 2006-05-10 Siemens Aktiengesellschaft Ventil zum Einspritzen von Brennstoff

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2218905A1 (de) * 2009-02-17 2010-08-18 Continental Automotive GmbH Injektor und Verfahren zum Einspritzen von Fluid
CN105275696A (zh) * 2015-11-12 2016-01-27 余姚市舒春机械有限公司 船用大功率柴油机喷射装置

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