EP1808596A1 - Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil - Google Patents

Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil Download PDF

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Publication number
EP1808596A1
EP1808596A1 EP06000640A EP06000640A EP1808596A1 EP 1808596 A1 EP1808596 A1 EP 1808596A1 EP 06000640 A EP06000640 A EP 06000640A EP 06000640 A EP06000640 A EP 06000640A EP 1808596 A1 EP1808596 A1 EP 1808596A1
Authority
EP
European Patent Office
Prior art keywords
valve
fixing element
valve body
cavity
coupled
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Withdrawn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
EP06000640A
Other languages
English (en)
French (fr)
Inventor
Antonio Dr. Bondi
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
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 EP06000640A priority Critical patent/EP1808596A1/de
Publication of EP1808596A1 publication Critical patent/EP1808596A1/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Withdrawn legal-status Critical Current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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • 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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/707—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for avoiding fuel contact with actuators, e.g. isolating actuators by using bellows or diaphragms

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.
  • 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 valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid outlet portion, a valve needle axially moveable in the cavity, and a sealing element.
  • the sealing element has an inner fixing element and an outer fixing element, wherein the inner fixing element is at least partially arranged inside the outer fixing element.
  • the outer fixing element has an outer surface coupled with the valve body and the inner fixing element has a cavity forming an inner surface coupled with the valve needle, and the inner fixing element and the outer fixing element are sealingly coupled by a layer of an elastic material.
  • the sealing element is sealingly coupling the valve body with the valve needle and enables an axial movement of the valve needle relative to the valve body.
  • a further advantage is that mechanical forces from outside the valve assembly on the valve needle can result in a movement of the valve needle due to the elastic properties of the sealing element.
  • the construction of the sealing element can be very simple and consequently, it is possible to obtain low costs for the sealing element.
  • the inner fixing element comprises a section formed as a hollow circular cylinder.
  • the outer fixing element comprises a section formed as a hollow cylinder.
  • the layer is consisting of rubber. This allows the use of a material which has a long term stability in view of tightness against fluids like fuels. Furthermore, the layer may be produced very simply and for very low costs.
  • the layer consists of viton (Registered Trade Mark). Viton is a synthetic rubber and fluoropolymer elastomer which has a high stability against aggressive chemicals like fuels.
  • the rubber is a vulcanized rubber adhesively coupling the inner fixing element to the outer fixing element.
  • the inner fixing element is coupled to the valve needle by a first welding connection and the outer fixing element is coupled to the valve body by a second welding connection.
  • the invention is distinguished by an injection valve with a chamber arranged in the valve body and an actuator unit arranged in the chamber in a way that the valve needle is actuable by the actuator unit and the sealing element prevents a fluid flow between the cavity and the chamber.
  • 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 access A 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 sealing element 42.
  • Figure 3 shows the sealing element 42 in a longitudinal section in an enlarged detailed view.
  • the sealing element 42 has a cylindrical inner fixing element 44 and cylindrical outer fixing element 48 coaxially arranged to the inner fixing element 44.
  • the inner fixing element 44 has a cavity 45 which forms an inner surface 46
  • the outer fixing element 48 has an outer surface 50.
  • the inner fixing element 44 is partially arranged inside the outer fixing element 48.
  • Between the inner fixing element 44 and the outer fixing element 48 a layer 52 is arranged.
  • the layer 52 is of an elastic material and is sealingly coupling the inner fixing element 44 and the outer fixing element 48.
  • the inner fixing element is coupled to the valve needle 22 by the inner surface 46 and a first welding connection 54.
  • the outer fixing element 48 is coupled with the valve body 20 by the outer surface 50 and a second welding connection 56.
  • the layer 52 consists of rubber, in particular of a vulcanized rubber which is adhesively coupling the inner fixing element 44 to the outer fixing element 48. By this a secure connection between the layer 52 and the fixing elements 44, 48 is enabled. Furthermore, the layer 52 made of a rubber enables a movement of the valve needle 22 in axial direction relative to the valve body 20.
  • the rubber is viton (Registered Trade Mark), which is a rubber with a high resistiveness against fluids such as fuels thereby enabling a long cycle time of the injection valve.
  • the inner fixing element 44 and the outer fixing element 48 are preferably made of stainless steel, as this material enables a long life time of the fixing elements 44, 48 as of their little corrosiveness.
  • the sealing element 42 has a length D and an outer diameter D.
  • the ratio of the length L to the outer diameter D of the sealing element 42 is preferably equal or less than one. This is equivalent with that the sealing element 42 is disk-shaped.
  • This embodiment has the advantage that the layer 52 made of rubber can be very easily vulcanized. Furthermore, if the length L of the sealing element 42 is small the length of the valve assembly 14 can be small as well which is an advantage if only little space is available. Furthermore, the side loads of the valve needle relative to the valve body 20 and the friction of the valve needle 22 are small.
  • 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.
  • 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. Due to the elastic properties of the layer 52 of the sealing element 42 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 valve body 20 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 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. Due to the elasticity of the layer 52 of the sealing element 42 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP06000640A 2006-01-12 2006-01-12 Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil Withdrawn EP1808596A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06000640A EP1808596A1 (de) 2006-01-12 2006-01-12 Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06000640A EP1808596A1 (de) 2006-01-12 2006-01-12 Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
EP1808596A1 true EP1808596A1 (de) 2007-07-18

Family

ID=36501911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06000640A Withdrawn EP1808596A1 (de) 2006-01-12 2006-01-12 Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil

Country Status (1)

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EP (1) EP1808596A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007012345U1 (de) 2007-09-04 2009-01-08 Witzenmann Gmbh Metallbalg
CN105508108A (zh) * 2014-10-14 2016-04-20 大陆汽车有限公司 设有导引元件的阀组件以及流体喷射器
DE102022206220A1 (de) 2022-06-22 2023-12-28 Robert Bosch Gesellschaft mit beschränkter Haftung Brennstoffventil zur dosierten Abgabe von Brennstoff

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346767A1 (de) * 1973-01-10 1974-07-18 Casals Cardona Ind S A Regel- und steuerventil fuer stroemende medien
GB2071762A (en) * 1980-03-12 1981-09-23 Daimler Benz Ag Fuel-injection nozzle for an internal combustion engine
EP1391609A1 (de) * 2002-08-20 2004-02-25 Siemens VDO Automotive S.p.A. Dosiervorrichtung mit hydraulischem Ring
DE10260289A1 (de) 2002-12-20 2004-07-08 Siemens Ag Injektor mit einer Vorrichtung zum Abdichten einer Aktoreinheit sowie Dichtring
EP1445480A1 (de) * 2003-02-04 2004-08-11 Siemens VDO Automotive S.p.A. Dosiervorrichtung mit Dynamischer Abdichtung
EP1445478A1 (de) 2003-01-24 2004-08-11 Siemens VDO Automotive S.p.A. Dichtungselement und Ventilnadel für eine Dosiervorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346767A1 (de) * 1973-01-10 1974-07-18 Casals Cardona Ind S A Regel- und steuerventil fuer stroemende medien
GB2071762A (en) * 1980-03-12 1981-09-23 Daimler Benz Ag Fuel-injection nozzle for an internal combustion engine
EP1391609A1 (de) * 2002-08-20 2004-02-25 Siemens VDO Automotive S.p.A. Dosiervorrichtung mit hydraulischem Ring
DE10260289A1 (de) 2002-12-20 2004-07-08 Siemens Ag Injektor mit einer Vorrichtung zum Abdichten einer Aktoreinheit sowie Dichtring
EP1445478A1 (de) 2003-01-24 2004-08-11 Siemens VDO Automotive S.p.A. Dichtungselement und Ventilnadel für eine Dosiervorrichtung
EP1445480A1 (de) * 2003-02-04 2004-08-11 Siemens VDO Automotive S.p.A. Dosiervorrichtung mit Dynamischer Abdichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007012345U1 (de) 2007-09-04 2009-01-08 Witzenmann Gmbh Metallbalg
CN105508108A (zh) * 2014-10-14 2016-04-20 大陆汽车有限公司 设有导引元件的阀组件以及流体喷射器
CN105508108B (zh) * 2014-10-14 2018-03-30 大陆汽车有限公司 设有导引元件的阀组件以及流体喷射器
DE102022206220A1 (de) 2022-06-22 2023-12-28 Robert Bosch Gesellschaft mit beschränkter Haftung Brennstoffventil zur dosierten Abgabe von Brennstoff

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