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EP2439400A1 - 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
EP2439400A1
EP2439400A1 EP10186580A EP10186580A EP2439400A1 EP 2439400 A1 EP2439400 A1 EP 2439400A1 EP 10186580 A EP10186580 A EP 10186580A EP 10186580 A EP10186580 A EP 10186580A EP 2439400 A1 EP2439400 A1 EP 2439400A1
Authority
EP
European Patent Office
Prior art keywords
valve
needle
seat
sealing layer
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.)
Withdrawn
Application number
EP10186580A
Other languages
German (de)
French (fr)
Inventor
Paolo Bertini
Massimiliano Cipriani
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 EP10186580A priority Critical patent/EP2439400A1/en
Publication of EP2439400A1 publication Critical patent/EP2439400A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • 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
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • 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
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188

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 an internal combustion engine 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 can accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or a 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.
  • the object of the invention is to create a valve assembly for an injection valve and an injection valve which is simple 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 inlet portion, a fluid outlet portion and a needle seat.
  • the valve assembly further comprises a valve needle axially movable in the cavity, the valve needle comprising a seat part with a sealing layer, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position in which the sealing layer rests on the needle seat and releasing the fluid flow through the fluid outlet portion in further positions.
  • the needle seat consists of a first material and the sealing layer consists of a second material being a metal, and the hardness of the first material is greater than the hardness of the second material.
  • the seat part of the valve needle may be better adapted to prevent a fluid flow through the fluid outlet portion in a closing position of the valve needle if deformations and surface roughness of the needle seat of the valve body occur. Furthermore, in the case of misalignments of the valve needle relative to the valve body, a compensation of the misalignment is possible and consequently, a fluid flow through the fluid outlet portion in a closing position of the valve needle can be prevented. Additionally, it is possible to apply small axial forces on the valve needle because of the good elastic deformability of the seat part of the valve needle. This can result in a good dynamic performance of the injection valve by the reduction of transient effects.
  • metals can be well-conductive materials which may be simply deposited on a carrier material. Furthermore, a low thickness of the second material can be obtained.
  • the second material comprises gold, silver or nickel. These materials can be easy available, well processable and have a high resistance against reactions with fluids like fuels.
  • the sealing layer has a thickness of up to 3 ⁇ m. This makes it possible to prevent a contamination of the valve assembly by the sealing layer.
  • the invention is distinguished by an injection valve with a valve assembly.
  • An injection valve 62 ( figure 1 ) that is in particular suitable for dosing fuel to an internal combustion engine, preferably under a pressure of up to 200 bar, comprises an inlet tube 2, a housing 6 and a valve assembly 60.
  • the valve assembly 60 comprises a valve body 4 with a central longitudinal axis L and a cavity 8 which takes in a valve needle 10 and preferably a part of an armature 12.
  • a recess 16 is provided which further extends to a recess 18 of the armature 12.
  • a spring 14 is arranged in the recess 16 of the inlet tube 2 and/or the recess 18 of the armature 12. Preferably, it rests on a spring seat being formed by an anti-bounce disk 20. By this, the spring 14 is mechanically coupled to the needle 10.
  • An adjusting tube 22 is provided in the recess 16 of the inlet tube 2. The adjusting tube 22 forms a further seat for the spring 14 and may be axially moved during the manufacturing process of the fluid injection valve in order to preload the spring 14 in a desired way.
  • valve needle 10 In a closing position of the valve needle 10, it sealingly rests on a needle seat 46 of a seat body 26, by this preventing a fluid flow through at least one injection nozzle 24.
  • the injection nozzle 24 may be, for example, an injection hole. However, it may also be of some other types suitable for dosing fluid.
  • the seat body 26 may be made in one part with the valve body 4 or be a part separate from the valve body 4. In addition to that, a lower guide 28 for guiding the needle 10 and a swirl disk 30 is provided.
  • the fluid injection valve is provided with an actuator unit 40 that comprises preferably an electromagnetic actuator comprising a coil 36 which is preferably overmolded.
  • an actuator unit 40 may, however, also comprise another type of actuator, which is known to persons skilled in the art for that purpose.
  • Such an actuator may be, for example, a piezoelectric actuator.
  • a fluid inlet portion 42 is provided in the valve body 4 which communicates with a fluid outlet portion 44 which is part of the cavity 8 near the seat body 26.
  • the valve needle 10 comprises a hollow shaft portion 48 and a seat part 50.
  • the seat part 50 is preferably of a material comprising a steel.
  • the seat part 50 comprises a sealing layer 52.
  • the shaft portion 48 of the valve needle 10 is coupled to the seat part 50 through a welding seam 54 to obtain an exact fixing of the seat part 50 relative to the shaft portion 48. It is obvious that any other method for coupling the seat part 50 with the shaft portion 48 may be applied as well as long as an exact positioning of the seat part 50 relative to the shaft portion 48 and a rigid coupling of the seat part 50 with the shaft portion 48 may be obtained.
  • the needle seat 46 consists of a first material which is preferably a metal, in particular a steel.
  • the sealing layer 52 of the seat part 50 consists of second material which is a metal and the hardness of the first material is higher than the hardness of the second material.
  • the metal of the second material is selected from the group of gold, silver and nickel. These materials are well-conductive and can be well deposited on a carrier material like a steel. Furthermore, a low thickness of these metals of preferably 2-3 ⁇ m can be obtained. This low thickness enables that a contamination of the fluid in the valve assembly 60 can be prevented.
  • the use of a less hard material for the sealing layer 52 of the seat part 50 of the valve needle 10 allows a good adaptation of the sealing layer 52 of the seat part 50 of the valve needle 10, if it is in contact with the seat body 26 in the area of the needle seat 46.
  • valve needle 10 is misaligned relative to the valve body 4, in particular if the seat part 50 is misaligned relative to the seat body 26, it is possible to compensate the deviation between these two parts in the case the material of the sealing layer 52 of the seat part 50 of the valve needle 10 is less hard than the material of the seat body 26. Therefore, good sealing properties can be obtained and a fluid flow through the fluid outlet portion 44 in a closing position of the valve needle 10 can be prevented.
  • valve needle 10 only small axial forces for the movement of the valve needle 10 are necessary as the sealing layer 52 of the seat part 52 of the valve needle 10 is well deformable. By this, a good dynamic performance may be obtained due to small transient effects. This allows a fast response of the injection valve which enables a linearity of the injection valve performance.
  • Figure 2 shows the valve assembly wherein the sealing layer 52 preferably comprises gold, silver or nickel which are materials with a high resistance against fluids such as fuels thereby enabling a long cycle time of the injection valve.
  • the sealing layer 52 preferably comprises gold, silver or nickel which are materials with a high resistance against fluids such as fuels thereby enabling a long cycle time of the injection valve.
  • the fluid is led from the inlet tube 2 to the hollow valve needle 10 and then to the fluid outlet portion 44.
  • the spring 14 forces the valve needle 10 via the anti-bounce disk 20 towards the actuator unit 40.
  • the spring 14 can force the valve needle 10 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 10 caused by the actuator unit 40 and the force on the valve needle 22 caused by the spring 14 whether the valve needle 10 is in its closing position or not.
  • the sealing layer 52 of the seat part 50 of the valve needle 10 sealingly rests on the needle seat 46 of the seat body 26 and consequently prevents a fluid flow through the fluid outlet portion 44 and the injection nozzle 24.
  • the use of metals for the sealing layer 52 which have a lower hardness than the material for the needle seat 46 of the seat body 26 can result in a good sealing between the needle seat 46 of the seat body 26 and the sealing layer 52 of the valve needle 10.
  • the actuator unit 40 may effect a force on the valve needle 10.
  • the valve needle 10 is able to move in axial direction out of the closing position. Outside of the closing position of the valve needle 10, a gap 64 is opened between the seat body 26 and the valve needle 10 at an axial end of the valve needle 10 facing away from the shaft portion 40 of the valve needle 10. This enables a fluid flow through the injection nozzle 24.

Landscapes

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

Abstract

Valve assembly (60) of an injection valve (62), the valve assembly (60) comprising a valve body (4) including a central longitudinal axis (L), the valve body (4) comprising a cavity (8) with a fluid inlet portion (42), a fluid outlet portion (44) and a needle seat (46), a valve needle (10) axially movable in the cavity (8), the valve needle (10) comprising a seat part (50) with a sealing layer (52) forming a surface of the seat part (50), the valve needle (10) preventing a fluid flow through the fluid outlet portion (44) in a closing position in which the sealing layer (52) rests on the needle seat (46) and releasing the fluid flow through the fluid outlet portion (44) in further positions, the needle seat (46) consisting of a first material and the sealing layer (52) consisting of a second material being a metal, and the hardness of the first material being greater than the hardness of the second material.

Description

  • The invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in widespread use, in particular for an internal combustion engine 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. In addition to that, injection valves can accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or a piezoelectric actuator.
  • In order to enhance the combustion process in view of degradation 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.
  • The object of the invention is to create a valve assembly for an injection valve and an injection valve which is simple to be manufactured and which facilitates a reliable and precise function.
  • This object is achieved by the features of the independent claim. Advantageous embodiments of the invention are given in the sub-claims.
  • According to a first aspect 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 inlet portion, a fluid outlet portion and a needle seat. The valve assembly further comprises a valve needle axially movable in the cavity, the valve needle comprising a seat part with a sealing layer, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position in which the sealing layer rests on the needle seat and releasing the fluid flow through the fluid outlet portion in further positions. The needle seat consists of a first material and the sealing layer consists of a second material being a metal, and the hardness of the first material is greater than the hardness of the second material.
  • This has the advantage, that different parts of the valve needle can be better adapted according to the particular requirements. The seat part of the valve needle may be better adapted to prevent a fluid flow through the fluid outlet portion in a closing position of the valve needle if deformations and surface roughness of the needle seat of the valve body occur. Furthermore, in the case of misalignments of the valve needle relative to the valve body, a compensation of the misalignment is possible and consequently, a fluid flow through the fluid outlet portion in a closing position of the valve needle can be prevented. Additionally, it is possible to apply small axial forces on the valve needle because of the good elastic deformability of the seat part of the valve needle. This can result in a good dynamic performance of the injection valve by the reduction of transient effects. Consequently, fast responses of the injection valve are possible which enable a linear performance of the valve needle movement. Furthermore, it is possible to avoid coining of the needle seat by the valve needle. Additionally, metals can be well-conductive materials which may be simply deposited on a carrier material. Furthermore, a low thickness of the second material can be obtained.
  • In a advantageous embodiment of the invention, the second material comprises gold, silver or nickel. These materials can be easy available, well processable and have a high resistance against reactions with fluids like fuels.
  • In a further advantageous embodiment of the invention, the sealing layer has a thickness of up to 3 µm. This makes it possible to prevent a contamination of the valve assembly by the sealing layer.
  • According to a second aspect the invention is distinguished by an injection valve with a valve assembly.
  • 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 in a longitudinal section view, and
    • figure 2, a section of a valve assembly of the injection valve in a longitudinal section view.
  • Elements of the same design and function that appear in different illustrations are identified by the same reference characters.
  • An injection valve 62 (figure 1) that is in particular suitable for dosing fuel to an internal combustion engine, preferably under a pressure of up to 200 bar, comprises an inlet tube 2, a housing 6 and a valve assembly 60.
  • The valve assembly 60 comprises a valve body 4 with a central longitudinal axis L and a cavity 8 which takes in a valve needle 10 and preferably a part of an armature 12. In the inlet tube 2, a recess 16 is provided which further extends to a recess 18 of the armature 12. A spring 14 is arranged in the recess 16 of the inlet tube 2 and/or the recess 18 of the armature 12. Preferably, it rests on a spring seat being formed by an anti-bounce disk 20. By this, the spring 14 is mechanically coupled to the needle 10. An adjusting tube 22 is provided in the recess 16 of the inlet tube 2. The adjusting tube 22 forms a further seat for the spring 14 and may be axially moved during the manufacturing process of the fluid injection valve in order to preload the spring 14 in a desired way.
  • In a closing position of the valve needle 10, it sealingly rests on a needle seat 46 of a seat body 26, by this preventing a fluid flow through at least one injection nozzle 24. The injection nozzle 24 may be, for example, an injection hole. However, it may also be of some other types suitable for dosing fluid. The seat body 26 may be made in one part with the valve body 4 or be a part separate from the valve body 4. In addition to that, a lower guide 28 for guiding the needle 10 and a swirl disk 30 is provided.
  • The fluid injection valve is provided with an actuator unit 40 that comprises preferably an electromagnetic actuator comprising a coil 36 which is preferably overmolded. A valve body shell 38, the armature 12 and the inlet tube 2 are forming an electromagnetic circuit. The actuator unit 40 may, however, also comprise another type of actuator, which is known to persons skilled in the art for that purpose. Such an actuator may be, for example, a piezoelectric actuator.
  • A fluid inlet portion 42 is provided in the valve body 4 which communicates with a fluid outlet portion 44 which is part of the cavity 8 near the seat body 26.
  • As can be seen in figure 2, the valve needle 10 comprises a hollow shaft portion 48 and a seat part 50. The seat part 50 is preferably of a material comprising a steel. The seat part 50 comprises a sealing layer 52.
  • The shaft portion 48 of the valve needle 10 is coupled to the seat part 50 through a welding seam 54 to obtain an exact fixing of the seat part 50 relative to the shaft portion 48. It is obvious that any other method for coupling the seat part 50 with the shaft portion 48 may be applied as well as long as an exact positioning of the seat part 50 relative to the shaft portion 48 and a rigid coupling of the seat part 50 with the shaft portion 48 may be obtained.
  • The needle seat 46 consists of a first material which is preferably a metal, in particular a steel. The sealing layer 52 of the seat part 50 consists of second material which is a metal and the hardness of the first material is higher than the hardness of the second material. Preferably the metal of the second material is selected from the group of gold, silver and nickel. These materials are well-conductive and can be well deposited on a carrier material like a steel. Furthermore, a low thickness of these metals of preferably 2-3 µm can be obtained. This low thickness enables that a contamination of the fluid in the valve assembly 60 can be prevented.
  • In case of deformations and surface roughness of the sealing layer 52 of the seat part 50 the use of a less hard material for the sealing layer 52 of the seat part 50 of the valve needle 10 allows a good adaptation of the sealing layer 52 of the seat part 50 of the valve needle 10, if it is in contact with the seat body 26 in the area of the needle seat 46.
  • Furthermore, if the valve needle 10 is misaligned relative to the valve body 4, in particular if the seat part 50 is misaligned relative to the seat body 26, it is possible to compensate the deviation between these two parts in the case the material of the sealing layer 52 of the seat part 50 of the valve needle 10 is less hard than the material of the seat body 26. Therefore, good sealing properties can be obtained and a fluid flow through the fluid outlet portion 44 in a closing position of the valve needle 10 can be prevented.
  • Additionally, only small axial forces for the movement of the valve needle 10 are necessary as the sealing layer 52 of the seat part 52 of the valve needle 10 is well deformable. By this, a good dynamic performance may be obtained due to small transient effects. This allows a fast response of the injection valve which enables a linearity of the injection valve performance.
  • Figure 2 shows the valve assembly wherein the sealing layer 52 preferably comprises gold, silver or nickel which are materials with a high resistance against fluids such as fuels thereby enabling a long cycle time of the injection valve.
  • In the following, the function of the injection valve is described in detail:
  • The fluid is led from the inlet tube 2 to the hollow valve needle 10 and then to the fluid outlet portion 44.
  • The spring 14 forces the valve needle 10 via the anti-bounce disk 20 towards the actuator unit 40. In the case when the actuator unit 40 is de-energized the spring 14 can force the valve needle 10 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 10 caused by the actuator unit 40 and the force on the valve needle 22 caused by the spring 14 whether the valve needle 10 is in its closing position or not.
  • In the closing position of the valve needle 10 the sealing layer 52 of the seat part 50 of the valve needle 10 sealingly rests on the needle seat 46 of the seat body 26 and consequently prevents a fluid flow through the fluid outlet portion 44 and the injection nozzle 24. The use of metals for the sealing layer 52 which have a lower hardness than the material for the needle seat 46 of the seat body 26 can result in a good sealing between the needle seat 46 of the seat body 26 and the sealing layer 52 of the valve needle 10.
  • In the case that the actuator unit 40 gets energized, the actuator unit 40 may effect a force on the valve needle 10. The valve needle 10 is able to move in axial direction out of the closing position. Outside of the closing position of the valve needle 10, a gap 64 is opened between the seat body 26 and the valve needle 10 at an axial end of the valve needle 10 facing away from the shaft portion 40 of the valve needle 10. This enables a fluid flow through the injection nozzle 24.

Claims (4)

  1. Valve assembly (60) of an injection valve (62), the valve assembly (60) comprising
    - a valve body (4) including a central longitudinal axis (L), the valve body (4) comprising a cavity (8) with a fluid inlet portion (42), a fluid outlet portion (44) and a needle seat (46),
    - a valve needle (10) axially movable in the cavity (8), the valve needle (10) comprising a seat part (50) with a sealing layer (52) forming a surface of the seat part (50), the valve needle (10) preventing a fluid flow through the fluid outlet portion (44) in a closing position in which the sealing layer (52) rests on the needle seat (46) and releasing the fluid flow through the fluid outlet portion (44) in further positions,
    the needle seat (46) consisting of a first material and the sealing layer (52) consisting of a second material being a metal, and the hardness of the first material being greater than the hardness of the second material.
  2. Valve assembly (60) in accordance with claim 1, with the second material comprising gold, silver or nickel.
  3. Valve assembly (60) in accordance with one of the preceding claims with the sealing layer (52) having a thickness of up to 3 µm.
  4. Injection valve (62) with a valve assembly (60) according to one of the preceding claims.
EP10186580A 2010-10-05 2010-10-05 Valve assembly for an injection valve and injection valve Withdrawn EP2439400A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10186580A EP2439400A1 (en) 2010-10-05 2010-10-05 Valve assembly for an injection valve and injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10186580A EP2439400A1 (en) 2010-10-05 2010-10-05 Valve assembly for an injection valve and injection valve

Publications (1)

Publication Number Publication Date
EP2439400A1 true EP2439400A1 (en) 2012-04-11

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EP10186580A Withdrawn EP2439400A1 (en) 2010-10-05 2010-10-05 Valve assembly for an injection valve and injection valve

Country Status (1)

Country Link
EP (1) EP2439400A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252302A4 (en) * 2015-01-30 2018-07-18 Hitachi Automotive Systems, Ltd. Fuel injection valve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010073837A (en) * 2000-01-21 2001-08-03 김원진 noiseless fuel injection device
WO2003006821A1 (en) * 2001-07-10 2003-01-23 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
US20040026532A1 (en) * 1999-09-03 2004-02-12 Lambert Malcolm David Dick Injection nozzle
WO2009038637A1 (en) * 2007-09-20 2009-03-26 Caterpillar Inc. Valve with thin-film coating
EP2067983A1 (en) * 2007-12-04 2009-06-10 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
US20100001215A1 (en) * 2008-07-07 2010-01-07 Keihin Corporation Electromagnetic fuel injection valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040026532A1 (en) * 1999-09-03 2004-02-12 Lambert Malcolm David Dick Injection nozzle
KR20010073837A (en) * 2000-01-21 2001-08-03 김원진 noiseless fuel injection device
WO2003006821A1 (en) * 2001-07-10 2003-01-23 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
WO2009038637A1 (en) * 2007-09-20 2009-03-26 Caterpillar Inc. Valve with thin-film coating
EP2067983A1 (en) * 2007-12-04 2009-06-10 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
US20100001215A1 (en) * 2008-07-07 2010-01-07 Keihin Corporation Electromagnetic fuel injection valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252302A4 (en) * 2015-01-30 2018-07-18 Hitachi Automotive Systems, Ltd. Fuel injection valve
US10415527B2 (en) 2015-01-30 2019-09-17 Hitachi Automotive Systems, Ltd. Fuel injection valve

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