EP2703633A1 - Valve assembly for an injection valve and injection valve - Google Patents

Valve assembly for an injection valve and injection valve Download PDF

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Publication number
EP2703633A1
EP2703633A1 EP12182002.1A EP12182002A EP2703633A1 EP 2703633 A1 EP2703633 A1 EP 2703633A1 EP 12182002 A EP12182002 A EP 12182002A EP 2703633 A1 EP2703633 A1 EP 2703633A1
Authority
EP
European Patent Office
Prior art keywords
valve
armature
pole piece
fluid
outlet portion
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Withdrawn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
EP12182002.1A
Other languages
German (de)
French (fr)
Inventor
Mauro Grandi
Claudio Malasoma
Enio Biasci
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 EP12182002.1A priority Critical patent/EP2703633A1/en
Publication of EP2703633A1 publication Critical patent/EP2703633A1/en
Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M2200/07—Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts

Definitions

  • the invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in wide spread 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 also 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 a piezo electric 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 diesel engines in the range of more than 2000 bar.
  • DE 102 57 896 A1 discloses a valve stem for a fuel injector being an elongated circular-section rod.
  • the armature is mounted near the top and is circular, with a through-passage for fuel flowing toward the valve at the nozzle tip.
  • DE 199 50 761 A1 discloses a fuel injection valve which has a valve needle that interacts with a valve seat surface and an armature movably guided on the valve needle.
  • the armature contains at least one fuel channel.
  • DE 199 27 900 A1 discloses a fuel injection valve which has a magnetic coil for controlling an armature, coupled to the valve closure element via a valve needle.
  • DE 198 49 210 A1 discloses a fuel injection valve which has a magnetic coil acting on an armature in a lifting direction against a restoring spring and a valve needle connected to a valve closure body.
  • the object of the invention is to create a valve assembly which facilitates a reliable and precise function.
  • the object of the invention is to create a valve assembly for an injection valve and an injection valve which are simply to be manufactured and which facilitate a reliable and precise function of the injection valve.
  • a valve assembly for an injection valve comprising a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid inlet portion and a fluid outlet portion, 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 through the fluid outlet portion in further positions, and an electro-magnetic actuator unit being designed to actuate the valve needle.
  • the electro-magnetic actuator unit comprises a pole piece and an armature, the armature being axially movable in the cavity, the pole piece comprising a stop surface facing the armature and being designed to limit an axial movement of the armature relative to the pole piece.
  • the armature has a first axial end facing the stop surface of the pole piece and a second axial end facing the fluid outlet portion.
  • the armature comprises at least one aperture extending from the first axial end to the second axial end of the armature. At the first axial end of the armature the at least one aperture is in complete overlap with the stop surface of the pole piece.
  • the at least one aperture has a cylindrical shape and is extending in axial direction. This has the advantage that the armature and the valve assembly can be manufactured in a simple manner.
  • the invention is distinguished by an injection valve with a valve assembly according to the first aspect of the invention.
  • FIG. 1 shows an injection valve 10 that is in particular suitable for dosing fuel to an internal combustion engine and which comprises in particular a valve assembly 11.
  • the valve assembly 11 comprises a valve body 12 with a central longitudinal axis L.
  • the valve assembly 11 comprises an inlet tube 14.
  • the inlet tube 14 is fixedly coupled to the valve body 12.
  • a housing 16 is partially arranged around the valve body 12.
  • a cavity 18 is arranged in the valve body 12.
  • the cavity 18 takes in a valve needle 20.
  • the valve needle 20 is hollow and has a recess 21 which is arranged in direction of the central longitudinal axis L over a portion of the axial length of the valve needle 20 or over the whole axial length of the valve needle 20.
  • the cavity 18 of the valve body 12, the recess 21 of the valve needle 20 and channels between the cavity 18 of the valve body 12 and the recess 21 of the valve needle 20 are parts of a main fluid line F_M.
  • the valve assembly 11 comprises an armature 22 and a retainer 23.
  • the armature 22 is separate from the retainer 23.
  • the armature 22 is axially movable in the cavity 18.
  • the retainer 23 is formed as a collar around the valve needle 20 and can guide the valve needle 20 in axial direction inside the inlet tube 14.
  • the armature 22 is separate from the valve needle 20 and is axially movable relative to the valve needle 20.
  • the armature 22 is rigidly connected to the valve needle 20 so that the armature 22 and the needle 20 are prevented from relative axial movement with respect to each other.
  • the retainer 23 and the armature 22 may be also formed as one piece.
  • a recess 26 is provided in the inlet tube 14.
  • a main spring 28 is arranged in the recess 26 of the inlet tube 14.
  • the main spring 28 is mechanically coupled to the retainer 23.
  • the retainer 23 forms a first seat for the main spring 28.
  • a filter element 30 is arranged in the inlet tube 14 and forms a further seat for the main spring 28.
  • the filter element 30 can be moved axially in the inlet tube 14 in order to preload the main spring 28 in a desired manner.
  • the main spring 28 exerts a force on the valve needle 20 towards an injection nozzle 34 of the injection valve 10.
  • the injection nozzle 34 may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the valve assembly 11 is provided with an actuator unit 36 that is preferably an electro-magnetic actuator.
  • the electro-magnetic actuator unit 36 comprises a pole piece 37 and a coil 38.
  • the pole piece 37 is fixedly coupled to the valve body 12.
  • the pole piece 37 has a stop surface 39 which faces the armature 22.
  • the stop surface 39 may limit an axial movement of the armature 22 relative to the pole piece 37.
  • the coil 38 is preferably arranged inside the housing 16.
  • the electro-magnetic actuator unit 36 comprises the armature 22.
  • the housing 16, the pole piece 37, parts of the valve body 12 and the armature 22 are forming an electromagnetic circuit.
  • the cavity 18 comprises a fluid outlet portion 40 which is arranged near the seat plate 32.
  • the fluid outlet portion 40 communicates with a fluid inlet portion 42 which is provided in the valve body 12.
  • a step 44 is arranged in the valve body 12.
  • the cavity 18 of the valve body 12 has a shape comprising a step.
  • An armature spring 46 - which is preferably a coil spring - is fixedly coupled to the step 44 in the valve body 12.
  • the step 44 and the armature spring 46 form a stop element for the armature 22.
  • the armature 22 has a first axial end 24a which faces the stop surface 39. Furthermore, the armature 22 has a second axial end 24b which faces the fluid outlet portion 40.
  • At least one aperture 48 is arranged in the armature 22.
  • the armature 22 has a plurality of apertures 48.
  • the apertures 48 extend from the first axial end 24a to the second axial end 24b of the armature 22.
  • the apertures 48 are designed as through holes.
  • the apertures 48 have a cylindrical shape and are extending in axial direction.
  • the apertures 48 are hydraulically coupling the stop surface 39 of the pole piece 37 with the fluid outlet portion 40.
  • the apertures 48 are in complete overlap with the stop surface 39 of the pole piece 37 at the first axial end 24a of the armature 22.
  • the valve needle 20 prevents a fluid flow through the fluid outlet portion 40 in the valve body 12 in a closing position of the valve needle 20. Outside of the closing position of the valve needle 20, the valve needle 20 enables the fluid flow through the fluid outlet portion 40.
  • the actuator unit 36 may effect an electro-magnetic force on the armature 22.
  • the armature 22 is attracted by the electro-magnetic actuator unit 36 with the coil 38 and moves in axial direction away from the fluid outlet portion 40.
  • the armature 22 takes the valve needle 20 with it so that the valve needle 20 moves in axial direction out of the closing position. Outside of the closing position of the valve needle 20 fluid can flow via the main fluid line F_M from the fluid inlet portion 42 to the recess 21 of the valve needle 20, further through the channels between the recess 21 of the valve needle 20 and the cavity 18 of the valve body 12 to the fluid outlet portion 40.
  • the gap between the valve body 12 and the valve needle 20 at the axial end of the injection valve 10 facing away from of the actuator unit 36 forms a fluid path and fluid can pass through the injection nozzle 34.
  • the main spring 28 can force the retainer 23 and the valve needle 20 to move in axial direction until the closing position of the valve needle 20 is reached. It is depending on the force balance between the force on the valve needle 20 caused by the actuator unit 36 and the force on the valve needle 20 caused by the main spring 28 whether the valve needle 20 is in its closing position or not.
  • armature fluid line F_A ( Figure 2 ). Sticking between the armature 22 and the pole piece 37 may be avoided and the force to release the armature 22 from the pole piece 37 may be kept small. Consequently, the armature 22 is released from the pole piece 37 during the closing process of the valve assembly 11 in an easy manner.
  • the armature 22 may move axially in direction to the fluid outlet portion 40 thereby enabling the valve needle 20 to reach its closing position. Consequently, a small closing time of the valve assembly 11 may be achieved.

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

Abstract

The invention relates to a valve assembly (11) for an injection valve (10), comprising a valve body (12) including a central longitudinal axis (L), the valve body (12) comprising a cavity (18) with a fluid inlet portion (42) and a fluid outlet portion (40), a valve needle (20) axially movable in the cavity (18), the valve needle (20) preventing a fluid flow through the fluid outlet portion (40) in a closing position and releasing the fluid flow through the fluid outlet portion (40) in further positions, and an electro-magnetic actuator unit (36). The electro-magnetic actuator unit (36) is designed to actuate the valve needle (20). The electro-magnetic actuator unit (36) comprises a pole piece (37) and an armature (22), comprising at least one aperture (48) extending from the first axial end (24a) to the second axial end (24b) of the armature (22).

Description

  • The invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in wide spread 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 also various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range. In addition to that, injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or a piezo electric actuator.
  • In order to enhance the combustion process in view of the creation of unwanted emissions, 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 diesel engines in the range of more than 2000 bar.
  • DE 102 57 896 A1 discloses a valve stem for a fuel injector being an elongated circular-section rod. The armature is mounted near the top and is circular, with a through-passage for fuel flowing toward the valve at the nozzle tip.
  • DE 199 50 761 A1 discloses a fuel injection valve which has a valve needle that interacts with a valve seat surface and an armature movably guided on the valve needle. The armature contains at least one fuel channel.
  • DE 199 27 900 A1 discloses a fuel injection valve which has a magnetic coil for controlling an armature, coupled to the valve closure element via a valve needle.
  • DE 198 49 210 A1 discloses a fuel injection valve which has a magnetic coil acting on an armature in a lifting direction against a restoring spring and a valve needle connected to a valve closure body.
  • The object of the invention is to create a valve assembly which facilitates a reliable and precise function.
  • The object of the invention is to create a valve assembly for an injection valve and an injection valve which are simply to be manufactured and which facilitate a reliable and precise function of the injection valve.
  • According to a first aspect the invention is distinguished by a valve assembly for an injection valve, comprising a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid inlet portion and a fluid outlet portion, 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 through the fluid outlet portion in further positions, and an electro-magnetic actuator unit being designed to actuate the valve needle. The electro-magnetic actuator unit comprises a pole piece and an armature, the armature being axially movable in the cavity, the pole piece comprising a stop surface facing the armature and being designed to limit an axial movement of the armature relative to the pole piece. The armature has a first axial end facing the stop surface of the pole piece and a second axial end facing the fluid outlet portion. The armature comprises at least one aperture extending from the first axial end to the second axial end of the armature. At the first axial end of the armature the at least one aperture is in complete overlap with the stop surface of the pole piece.
  • This has the advantage that an entrance of fluid between the armature and the pole piece may be obtained easily. Consequently, fluid may be pressed against the pole piece to facilitate the release of the armature from the pole piece during the closing of the valve assembly. Therefore, a sticking effect between the surfaces of the armature and the pole piece may be avoided. Consequently, a force to release the armature from the pole piece may be kept small. Consequently, the closing time of the valve assembly may be small. Consequently, the valve assembly may be operated very fast. Furthermore, due to the small force to release the armature from the pole piece the maximum of the pressure needed for operating the valve assembly - in particular for moving the armature away from the pole piece - may be kept small.
  • In an advantageous embodiment the at least one aperture has a cylindrical shape and is extending in axial direction. This has the advantage that the armature and the valve assembly can be manufactured in a simple manner.
  • According to a second aspect the invention is distinguished by an injection valve with a valve assembly according to the first aspect of the invention.
  • Exemplary embodiments of the invention are explained in the following with the aid of schematic drawings. These are as follows:
    • Figure 1,
    an injection valve with a valve assembly in a longitudinal section view, and
    Figure 2,
    an enlarged view of the valve assembly in a section II of Figure 1 in a longitudinal section view.
  • Elements of the same design and function that appear in different illustrations are identified by the same reference character.
  • Figure 1 shows an injection valve 10 that is in particular suitable for dosing fuel to an internal combustion engine and which comprises in particular a valve assembly 11. The valve assembly 11 comprises a valve body 12 with a central longitudinal axis L. The valve assembly 11 comprises an inlet tube 14. The inlet tube 14 is fixedly coupled to the valve body 12. A housing 16 is partially arranged around the valve body 12. A cavity 18 is arranged in the valve body 12. The cavity 18 takes in a valve needle 20. The valve needle 20 is hollow and has a recess 21 which is arranged in direction of the central longitudinal axis L over a portion of the axial length of the valve needle 20 or over the whole axial length of the valve needle 20.
  • The cavity 18 of the valve body 12, the recess 21 of the valve needle 20 and channels between the cavity 18 of the valve body 12 and the recess 21 of the valve needle 20 are parts of a main fluid line F_M.
  • The valve assembly 11 comprises an armature 22 and a retainer 23. The armature 22 is separate from the retainer 23. The armature 22 is axially movable in the cavity 18. The retainer 23 is formed as a collar around the valve needle 20 and can guide the valve needle 20 in axial direction inside the inlet tube 14.
  • In the present embodiment, the armature 22 is separate from the valve needle 20 and is axially movable relative to the valve needle 20. However, it is also concievable that the armature 22 is rigidly connected to the valve needle 20 so that the armature 22 and the needle 20 are prevented from relative axial movement with respect to each other. In this case, the retainer 23 and the armature 22 may be also formed as one piece.
  • A recess 26 is provided in the inlet tube 14. A main spring 28 is arranged in the recess 26 of the inlet tube 14. The main spring 28 is mechanically coupled to the retainer 23. The retainer 23 forms a first seat for the main spring 28.
  • A filter element 30 is arranged in the inlet tube 14 and forms a further seat for the main spring 28. During the manufacturing process of the injection valve 10 the filter element 30 can be moved axially in the inlet tube 14 in order to preload the main spring 28 in a desired manner. By this the main spring 28 exerts a force on the valve needle 20 towards an injection nozzle 34 of the injection valve 10.
  • In a closing position of the valve needle 20, it sealingly rests on a seat plate 32 thereby preventing a fluid flow through the at least one injection nozzle 34. The injection nozzle 34 may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • The valve assembly 11 is provided with an actuator unit 36 that is preferably an electro-magnetic actuator. The electro-magnetic actuator unit 36 comprises a pole piece 37 and a coil 38. The pole piece 37 is fixedly coupled to the valve body 12. The pole piece 37 has a stop surface 39 which faces the armature 22. The stop surface 39 may limit an axial movement of the armature 22 relative to the pole piece 37. The coil 38 is preferably arranged inside the housing 16. Furthermore, the electro-magnetic actuator unit 36 comprises the armature 22. The housing 16, the pole piece 37, parts of the valve body 12 and the armature 22 are forming an electromagnetic circuit.
  • The cavity 18 comprises a fluid outlet portion 40 which is arranged near the seat plate 32. The fluid outlet portion 40 communicates with a fluid inlet portion 42 which is provided in the valve body 12.
  • A step 44 is arranged in the valve body 12. For example, the cavity 18 of the valve body 12 has a shape comprising a step. An armature spring 46 - which is preferably a coil spring - is fixedly coupled to the step 44 in the valve body 12. The step 44 and the armature spring 46 form a stop element for the armature 22.
  • The armature 22 has a first axial end 24a which faces the stop surface 39. Furthermore, the armature 22 has a second axial end 24b which faces the fluid outlet portion 40.
  • At least one aperture 48 is arranged in the armature 22. Preferably, the armature 22 has a plurality of apertures 48. The apertures 48 extend from the first axial end 24a to the second axial end 24b of the armature 22. The apertures 48 are designed as through holes. Preferably, the apertures 48 have a cylindrical shape and are extending in axial direction. The apertures 48 are hydraulically coupling the stop surface 39 of the pole piece 37 with the fluid outlet portion 40. The apertures 48 are in complete overlap with the stop surface 39 of the pole piece 37 at the first axial end 24a of the armature 22.
  • In the following, the function of the injection valve 10 is described in detail:
    • The fluid is led from the fluid inlet portion 42 towards the fluid outlet portion 40.
  • The valve needle 20 prevents a fluid flow through the fluid outlet portion 40 in the valve body 12 in a closing position of the valve needle 20. Outside of the closing position of the valve needle 20, the valve needle 20 enables the fluid flow through the fluid outlet portion 40.
  • In the case when the electro-magnetic actuator unit 36 with the coil 38 gets energized the actuator unit 36 may effect an electro-magnetic force on the armature 22. The armature 22 is attracted by the electro-magnetic actuator unit 36 with the coil 38 and moves in axial direction away from the fluid outlet portion 40. The armature 22 takes the valve needle 20 with it so that the valve needle 20 moves in axial direction out of the closing position. Outside of the closing position of the valve needle 20 fluid can flow via the main fluid line F_M from the fluid inlet portion 42 to the recess 21 of the valve needle 20, further through the channels between the recess 21 of the valve needle 20 and the cavity 18 of the valve body 12 to the fluid outlet portion 40. The gap between the valve body 12 and the valve needle 20 at the axial end of the injection valve 10 facing away from of the actuator unit 36 forms a fluid path and fluid can pass through the injection nozzle 34.
  • In the case when the actuator unit 36 is de-energized the main spring 28 can force the retainer 23 and the valve needle 20 to move in axial direction until the closing position of the valve needle 20 is reached. It is depending on the force balance between the force on the valve needle 20 caused by the actuator unit 36 and the force on the valve needle 20 caused by the main spring 28 whether the valve needle 20 is in its closing position or not.
  • Due to the apertures 48 in the armature 22 fluid may be pressed against the pole piece 37 via an armature fluid line F_A (Figure 2). Sticking between the armature 22 and the pole piece 37 may be avoided and the force to release the armature 22 from the pole piece 37 may be kept small. Consequently, the armature 22 is released from the pole piece 37 during the closing process of the valve assembly 11 in an easy manner. The armature 22 may move axially in direction to the fluid outlet portion 40 thereby enabling the valve needle 20 to reach its closing position. Consequently, a small closing time of the valve assembly 11 may be achieved.
  • Due to the advantageous dynamic of the valve assembly 11 pressure fluctuations in the fluid outlet portion 40 and mass flow fluctuations of the fluid may be kept small. Consequently, the fluid spray leaving the fluid outlet portion 40 via the injection nozzle 34 may have a high stability.

Claims (3)

  1. Valve assembly (11) for an injection valve (10), comprising
    - a valve body (12) including a central longitudinal axis (L), the valve body (12) comprising a cavity (18) with a fluid inlet portion (42) and a fluid outlet portion (40),
    - a valve needle (20) axially movable in the cavity (18), the valve needle (20) preventing a fluid flow through the fluid outlet portion (40) in a closing position and releasing the fluid flow through the fluid outlet portion (40) in further positions, and
    - an electro-magnetic actuator unit (36) being designed to actuate the valve needle (20), the electro-magnetic actuator unit (36) comprising a pole piece (37) and an armature (22), the armature (22) being axially movable in the cavity (18), the pole piece (37) comprising a stop surface (39) facing the armature (22) and being designed to limit an axial movement of the armature (22) relative to the pole piece (37), the armature (22) having a first axial end (24a) facing the stop surface (39) of the pole piece (37) and a second axial end (24b) facing the fluid outlet portion (40),
    wherein the armature (22) comprises at least one aperture (48) extending from the first axial end (24a) to the second axial end (24b) of the armature (22), and at the first axial end (24a) of the armature (22) the at least one aperture (48) is in complete overlap with the stop surface (39) of the pole piece (37).
  2. Valve assembly (11) according to claim 1, wherein the at least one aperture (48) has a cylindrical shape and is extending in axial direction.
  3. Injection valve (10) with a valve assembly (11) according to one of the preceding claims.
EP12182002.1A 2012-08-28 2012-08-28 Valve assembly for an injection valve and injection valve Withdrawn EP2703633A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12182002.1A EP2703633A1 (en) 2012-08-28 2012-08-28 Valve assembly for an injection valve and injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12182002.1A EP2703633A1 (en) 2012-08-28 2012-08-28 Valve assembly for an injection valve and injection valve

Publications (1)

Publication Number Publication Date
EP2703633A1 true EP2703633A1 (en) 2014-03-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12182002.1A Withdrawn EP2703633A1 (en) 2012-08-28 2012-08-28 Valve assembly for an injection valve and injection valve

Country Status (1)

Country Link
EP (1) EP2703633A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849210A1 (en) 1998-10-26 2000-04-27 Bosch Gmbh Robert Fuel injection valve for internal combustion engine fuel injection system has armature movable between two stops, damping spring arranged between second stop and armature
DE19927900A1 (en) 1999-06-18 2000-12-21 Bosch Gmbh Robert Fuel injection valve for direct injection IC engine has movement of armature limited by opposing stops attached to valve needle one of which is provided by spring element
DE19950761A1 (en) 1999-10-21 2001-04-26 Bosch Gmbh Robert Fuel injection valve has supporting ring between elastomeric ring and armature that supports elastomeric ring axially near opening of fuel channel in armature and radially on shoulder
WO2003018994A1 (en) * 2001-08-20 2003-03-06 Robert Bosch Gmbh Fuel injection valve
DE10257896A1 (en) 2002-12-11 2004-07-01 Robert Bosch Gmbh Valve body with elongated valve stem for fuel injector used in internal combustion engine, has armature near top attracted by electromagnetic coil and incorporating through-passage for fuel
US20090127355A1 (en) * 2007-11-20 2009-05-21 Denso Corporation Fuel injection valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849210A1 (en) 1998-10-26 2000-04-27 Bosch Gmbh Robert Fuel injection valve for internal combustion engine fuel injection system has armature movable between two stops, damping spring arranged between second stop and armature
DE19927900A1 (en) 1999-06-18 2000-12-21 Bosch Gmbh Robert Fuel injection valve for direct injection IC engine has movement of armature limited by opposing stops attached to valve needle one of which is provided by spring element
DE19950761A1 (en) 1999-10-21 2001-04-26 Bosch Gmbh Robert Fuel injection valve has supporting ring between elastomeric ring and armature that supports elastomeric ring axially near opening of fuel channel in armature and radially on shoulder
WO2003018994A1 (en) * 2001-08-20 2003-03-06 Robert Bosch Gmbh Fuel injection valve
DE10257896A1 (en) 2002-12-11 2004-07-01 Robert Bosch Gmbh Valve body with elongated valve stem for fuel injector used in internal combustion engine, has armature near top attracted by electromagnetic coil and incorporating through-passage for fuel
US20090127355A1 (en) * 2007-11-20 2009-05-21 Denso Corporation Fuel injection valve

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