CN112523908A - Valve for metering fluids - Google Patents

Valve for metering fluids Download PDF

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Publication number
CN112523908A
CN112523908A CN202010984643.XA CN202010984643A CN112523908A CN 112523908 A CN112523908 A CN 112523908A CN 202010984643 A CN202010984643 A CN 202010984643A CN 112523908 A CN112523908 A CN 112523908A
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CN
China
Prior art keywords
armature
stop element
valve
wear
preparation
Prior art date
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Pending
Application number
CN202010984643.XA
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Chinese (zh)
Inventor
M·比纳
N·赫尔曼
P·劳申贝格尔
S·塞尔尼
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of CN112523908A publication Critical patent/CN112523908A/en
Pending legal-status Critical Current

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    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not 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
    • 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
    • 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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

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  • 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

The invention relates to a valve (1) for metering a fluid, in particular a fuel injection valve for an internal combustion engine, having an actuator (2) and a valve needle (15) that can be actuated by the actuator (2) along a longitudinal axis (8), wherein an armature (4) of the actuator (2) is arranged on the valve needle (15), wherein the armature (4) can be displaced relative to the valve needle (15) in accordance with an armature free travel (20) along the longitudinal axis (8), and wherein at least one stop element (16) is provided, which is arranged on the valve needle (15), wherein the stop element (16) limits the displacement of the armature (4) relative to the valve needle (15). It is proposed that a wear edge (24) is provided, on which a contact (26) between the armature (4) and the stop element (16) occurs during operation, in order to limit a displacement of the armature (4) relative to the valve needle (15).

Description

Valve for metering fluids
Technical Field
The invention relates to a valve for metering a fluid, in particular a fuel injection valve for an internal combustion engine. In particular, the invention relates to the field of injectors for fuel injection systems of motor vehicles, in which fuel is preferably injected directly into the combustion chamber of an internal combustion engine.
Background
DE 102016225776 a1 discloses a fuel injection valve for a fuel injection system of an internal combustion engine. A known fuel injection valve comprises a housing, a valve needle having a valve closing body which cooperates with a valve seat surface to form a sealing seat, and an armature of an electromagnetic actuator which is arranged on the valve needle. A stop fixed with respect to the valve needle position is provided on the valve needle, between which the armature can move in accordance with the armature's free stroke. Such a stop can be formed on a stop element connected to the valve needle.
The following disadvantages can occur in the configuration of the fuel injection valve known from DE 102016225776 a 1: a certain wear occurs on the stop during the service life. In this case, the surfaces on the stop elements wear out due to the knocking contact in such a way that a grinding or engagement occurs. This can occur in particular in the first 50 to 100 million load alternations, for example in the first 50 to 100 million load alternations in total of 500 to 1000 million load alternations occurring over the entire service life. As a result, valve characteristic changes can occur due to the strong hydraulic damping at the stop.
Disclosure of Invention
According to the invention, a valve for metering a fluid, in particular a fuel injection valve for an internal combustion engine, having an actuator and a valve needle which can be actuated by the actuator along a longitudinal axis, wherein an armature of the actuator is arranged on the valve needle, wherein the armature can be displaced relative to the valve needle in accordance with an armature free stroke along the longitudinal axis, and wherein at least one stop element arranged on the valve needle is provided, which stop element limits the displacement of the armature relative to the valve needle, wherein a wear edge is provided on which a contact between the armature and the stop element occurs during operation in order to limit the displacement of the armature relative to the valve needle. The valve according to the invention has the following advantages: improved configuration and operation can be achieved. In particular, reliable functioning with particularly constant functional properties can be ensured over the service life and thus the injection properties can be improved.
In the following, advantageous embodiments of the valve are described.
In the proposed valve configuration, an electromagnetic actuator is provided with an armature arranged on the valve needle, wherein the armature is not fixedly connected to the valve needle, but rather is mounted so as to be movable between two stops arranged on the valve needle. In this case, an axial play is predefined between the armature and the two stops, which is referred to as the free travel of the armature. The armature can be held in the rest state by the armature free travel spring against a stop closer to the sealing seat, so that the entire armature free travel is preferably available as an acceleration path during the subsequent actuation of the actuator and the subsequent actuation of the armature in this case.
The configuration with free travel of the armature has several advantages. Due to the pulse generated by the armature during opening, the valve needle can be opened safely even at higher fluid pressures, in particular fuel pressures, with the same magnetic force, which constitutes a mechanical enhancement. Furthermore, the movable mass can be decoupled, so that the stop force is divided into two pulses, as a result of which less valve seat wear results. In addition, the tendency of the valve needle to flutter can be avoided by decoupling the masses, in particular in the case of highly dynamic valves.
At least one stop is provided on a stop element which is arranged on the valve needle and limits the displacement of the armature relative to the valve needle. Preferably, this relates to a stop which is loaded more strongly during operation. In particular, the proposed design may relate to a stop against which the armature stops when the valve is closed, and which is provided in particular on a stop element designed as a stop sleeve.
The stop provided on the stop element can be configured to be adapted to the respective application. In this case, in particular, a hydraulic damping can be realized, which acts when the armature strikes against a stop. In particular when the valve is closed, a sufficiently rapid standstill of the armature can be set in this case, which has a positive effect on the achievable dwell time between injections. In this case, the proposed configuration prevents the hydraulic damping from changing during operation due to wear. In particular, an at least substantially constant opening and closing behavior can thereby be achieved, which is important above all when small quantities are metered.
The valve is preferably used for metering liquid fluids, in particular liquid fuels. In particular gasoline or a mixture with gasoline is suitable as fuel. The term fuel is to be understood here in general, i.e. the fuel may also have a certain water content which may vary during operation, in particular. The fuel is preferably injected directly into the combustion chamber of the internal combustion engine.
A liquid fluid can flow through the armature chamber in which the armature is arranged and thus contribute to the damping of the armature. In particular, significant advantages are obtained in this preferred application, since damping can be achieved in as constant a manner as possible even in the case of liquid fluids of different composition. This can relate not only to the damping behavior over the service life, but also to the influence of the liquid fluid present in the armature chamber at the corresponding point in time or temporarily stored in the tank of the injection device. In particular, it has been shown that in conventional valves, the varying composition (in particular with regard to the ethanol content) and the low quality of the fuel mixture (in particular with regard to the water, acid and chloride content) can lead to high wear between the armature and the stop element (in particular the stop sleeve). Furthermore, if the effects of changes, such as temperature and ethanol content, must be taken into account during operation by suitable adaptation, for example, in the behavior of the characteristic curves for actuation, such wear can lead to premature failure in conventional valves. In particular, greater damping can be produced by wear, as can be produced by filling with fluids having higher viscosities (e.g., E85 and E100). The valve behavior can be varied in an additive manner so strongly, in particular in the direction of too strong damping, that failure occurs, since the limit of the regulation is exceeded.
The damping of the armature movement is achieved by hydraulic pressure. These forces are generated by the liquid fluid being pressed or flowing into a defined region in an armature chamber in which the armature moves during actuation. In particular, in the context of the proposed solution, the space between the stop element and the armature is important. In this case, a distinction can be made between viscous forces and hydrodynamic forces. The pressure level during the flow in the narrow gap depends mainly on the viscosity of the liquid fluid, which is particularly relevant when two parallel faces or faces are in contact with each other or are separated from each other. In this connection, the wear also plays a particular role in terms of service life, since parallel surfaces which wear away from one another and thus become larger are thereby formed between the armature and the stop element. For example, parallel surfaces can be avoided by a wedge-shaped design. In addition, the wear edge, on which the contact occurs, can prevent or at least significantly reduce the increase in wear and thus the contact surface between the stop element and the armature, which wear away from each other, during the service life in the proposed manner. Due to the proposed measures and, if appropriate, due to an advantageous embodiment, it is therefore possible to reduce the damping at the narrow gap, which is strongly dependent on the viscosity of the fluid, at least to such an extent that it plays only a secondary role in damping. The valve characteristics are thereby kept within predefined limits, so that, if necessary, a desired adaptation, in particular to the temperature and viscosity of the liquid fluid, can be achieved by controlling, for example, over the service life.
Preferably, the wear edge is formed on the stop element. In particular, the stop element is generally less expensive to manufacture or structurally configure. In particular, a planar end face can be realized on the armature.
Preferably, a stop element surface is provided on the stop element facing the armature and the wear edge is arranged radially outward on the stop element surface. This embodiment has the following advantages: comprising a volume which expands in the radial direction and which, due to a local overpressure or underpressure, enables damping of the armature. The component of the damping force associated therewith is proportional to the effective surface perpendicular to the longitudinal axis.
Preferably, the armature is wear-resistant at least in the region of its end face facing the stop element, in which region during operation contact occurs between the wear-resistant edge of the armature and the stop. This embodiment makes it possible, for example, to achieve an advantageous possibility to prevent the end face of the armature from wearing away from the wear edge of the stop element during the service life.
In particular, the geometry of the stop element, including, if appropriate, the geometry of the armature, makes it possible to: the stop element is configured with respect to the end face of the armature facing the stop element surface in such a way that the hydrodynamic damping of the armature displacement is at least substantially dominant compared to the viscous damping of the armature displacement. In this case, the stop element surface of the stop element facing the end face of the armature is configured by means of a taper and/or at least one step in such a way that, when contact occurs between the armature and the stop element, a geometric configuration of the damping chamber, in particular an average height of the damping chamber along the longitudinal axis, is obtained between the stop element surface of the stop element and the end face of the armature, in which case the hydrodynamic damping of the armature displacement is at least substantially predominant compared to the viscous damping of the armature displacement, as a result of which a preferred measure is provided, which can be realized in particular cost-effectively and preferably does not require a matching of the armature.
Preferably, a coating is provided on the stop element, which coating forms a protection against wear and the wear-resistant edges are realized by the coating. This embodiment advantageously makes it possible to achieve a wear-resistant configuration of the relevant edge of the stop element. However, other measures are also conceivable, such as surface treatment or a multi-part design of the stop element with a correspondingly wear-resistant edge portion on which the wear-resistant edge is realized. The measures for wear-resistant edge formation should result in a hard and corrosion-resistant surface. The corrosion resistance should be able to withstand water and ethanol in particular. An advantageous realization of such a surface can be achieved by, for example, a hard chromium-based coating.
Preferably, the wear edge is configured as an edge which is at least substantially closed in the circumferential direction, wherein an at least substantially linear contact between the armature and the stop element can be achieved. It is further preferred that the armature has at least one passage opening on its end face facing away from the stop element, on which end face during operation contact occurs between the armature and the wear edge of the stop, and that the at least one passage opening is arranged radially outside the wear edge on the end face. These embodiments enable further improvements. In this case, in particular, the through-opening through the armature on the end face, on which the stop element is stopped, can be arranged radially outward, viewed in the radial direction. On the one hand, a correspondingly large hydrodynamic force is thereby generated during the damping. Since a line-shaped contact can be achieved by the wear-resistant edge over the service life, it is furthermore possible to reduce the viscous forces to such an extent that a circumferential and continuous seal at the edge can be achieved when the armature bears against the stop element, without the viscous forces occurring in this connection, in particular during disengagement, becoming excessive.
Thus, a valve suitable for higher requirements can also be realized. In this case, particularly high system pressures can lead to increased stop loads, which occur primarily when the valve is closed. The functionality over the service life can be ensured by the proposed and, if necessary, further developed configuration of the valve. A further advantage is that increased loading can be achieved, for example, by the fluid to be metered being guided through the armature chamber. The fuel may, for example, contain corrosive additives, such as chlorides or acids, which lead to increased wear rates due to fretting corrosion. The dependence of the valve behavior on the viscosity of the fuel and the wear occurring during the service life in operation can be reduced in the proposed manner.
Drawings
In the following description, embodiments of the present invention are explained in detail with reference to the drawings. The figures show:
fig. 1 is a schematic cross-sectional view of a part of a valve according to an embodiment of the present invention.
Detailed Description
Fig. 1 shows a schematic sectional view of a part of a valve 1 for metering fluids according to a preferred embodiment. The valve 1 can be designed in particular as a fuel injection valve 1. A preferred application is a fuel injection system, wherein such a fuel injection valve 1 is designed as a high-pressure injection valve 1 and is used for injecting fuel directly into an associated combustion chamber of an internal combustion engine. The configuration of the valve 1 is particularly suitable for liquid fluids, in particular liquid fuels, such as gasoline or diesel, or for liquid mixtures with at least one fuel.
The valve 1 has an electromagnetic actuator 2 which comprises an electromagnetic coil 3, an armature 4 and an inner pole 5. When the electromagnetic coil 3 is energized, the electromagnetic circuit is closed by the housing (valve housing) 6, the armature 4 and the inner pole 5, as a result of which the armature 4 is actuated along a longitudinal axis (axis) 8 of the housing 6 in an opening direction 7. The housing 6 also comprises a valve seat body 9.
The armature 4 is arranged on the valve needle 15, wherein a movable mounting of the armature 4 on the valve needle 15 is realized. For this purpose, stop elements 16, 17 are provided on the valve needle 15, which are arranged in a stationary manner on the valve needle 15. In this exemplary embodiment, the stop element 16 has a base body 18, which is connected to the valve needle 15 by a weld seam 19. The stop element 17 can be press-fitted onto the valve needle 15. The stop elements 16, 17 are arranged on the valve needle 15 in such a way that an armature free travel 20 is predefined between the stop elements 16, 17 for the armature 4. As a result, the armature 4 can be adjusted along the longitudinal axis 8 relative to the valve needle 15 between the stop elements 16, 17.
The stop element 16 has a coating 21 applied to the base body 18, which coating constitutes a protection against wear of the stop element 16. A stop element surface 22 is formed on the coating 21, which stop element surface faces an end face 23 of the armature 4. The stop element 16 has a wear edge 24, which in this exemplary embodiment is realized by means of a coating 21. However, the wear edge 24 can also be realized in other ways if desired. During operation, the contact 26 between the armature 4 and the stop element 16 occurs only at the wear edge 24. In this case, approximately linear contacts 26 are specified, which preferably occur in circumferentially closed lines.
The magnet armature 4 can be designed to be wear-resistant at least in the region 25 of its end face 23 facing the stop element 16, in which region during operation a contact 26 between the magnet armature 4 and the stop element 16 occurs at the wear edge 24. For this purpose, for example, a wear-resistant coating 27 can be used.
In the initial state, the magnet armature 4 rests against a wear edge of the stop element 16. When actuating the armature 4, the armature 4 first moves over the armature free travel 20 until the armature 4 comes to a stop at the stop 17. Subsequently, the armature 4 carries the valve needle 15 in the opening direction 7. Thereby, a larger opening pulse is available in order to open the valve 1. When the valve 1 is open, the valve closing body 30 connected to the valve needle 15 is lifted off a valve seat surface 31 formed on the valve seat body 9, so that a sealing seat formed between the valve closing body 30 and the valve seat surface 31 is opened. A liquid fluid, in particular a fuel, can then be injected from the interior 32 of the valve housing 6 through the nozzle bores 33, 34 formed in the valve seat body 31 into a space 35, in particular a combustion chamber 35 of an internal combustion engine. The valve 1 is configured as an inwardly opening valve 1. In a modified embodiment, the valve 1 can also be designed as an outwardly open valve 1.
When the valve 1 is open, the armature 4 stops against the inner pole 5, so that the movement of the armature 4 relative to the valve housing 6 is limited. To close the valve 1, the solenoid 3 is switched to currentless, so that the valve needle 15 is again adjusted by the restoring spring (closing spring) 36 into the initial position. In the closed state, an initial position of the armature 4, in which the armature 4 rests against the wear edge 24 of the stop element 16, is ensured by the armature free travel spring 37. The valve needle 15 can thus be operated by the actuator 2 against the force of the return spring 37 in order to open the valve 1. When the valve 1 is opened and subsequently closed, the valve needle 15 is guided on the one hand on the inner pole 5 and on the other hand in the region of the valve seat body 9. The armature 4 can be guided on the valve needle 15.
The stop element surface 22 of the stop element 16 has a taper 43 between the outer radius 40 and the inner radius 41, which is indicated here by the distance 42 at the inner radius 41. The taper 43 or the distance 42 is predetermined such that the viscosity caused by the hydrodynamic forces prevails. Furthermore, a step 45 is realized on the stop element 16 between the inner radius 41 and the radius 44 of the valve needle 15. As a result, a damping chamber 46 is formed, the volume of which can be predefined within certain limits by the conicity 43 and the step 45 if there is contact. This enables adaptation to the respective application.
Preferably, the fluid exchange between the damping chamber 46 and the remaining actuator chamber 49 takes place only at the wear edge 24 and, if applicable, via the gap 47 between the armature 4 and the circumferential surface 48 of the valve needle 15. The damping behavior can also be influenced further, if necessary, by dimensioning the gap 50 between the armature 4 and the inner wall 51 of the housing 6. Matching with the respective application situation can be achieved.
The armature 4 has at least one through-opening 52, which has an opening 53 on the end face 23 of the armature 4. Viewed radially, the opening 53 can advantageously lie completely outside the outer radius 40 of the stop element 16 and thus completely outside the wear edge 24 of the stop element 16. Since the dependency on the viscous forces is reduced during damping, the wear edge 24 can optionally also be designed as a continuous wear edge 24 which runs around the longitudinal axis 8 and which makes possible an uninterrupted linear contact 26 between the stop element 16 and the armature 4. However, the wear edge 24 may also be interrupted, if appropriate, in order to facilitate the inflow of liquid fluid into the space 46, in particular when the armature 4 is detached from the stop element 16.
The proposed configuration of the stop element 16 is particularly suitable for a stop element 16 against which the armature 4 strikes when closed. In this case, a rapid standstill of the armature 4 can be brought about in the event of a possible and possibly repeated vibration. What is important here is an alternating overpressure and underpressure, which is obtained by the armature 4 repeatedly approaching and departing from the end face 40 of the base body 18. In this case, a constant damping behavior is achieved over the service life. In particular, when the injected fuel quantity is small, it can be ensured that the metered fuel quantity corresponds to a predefined characteristic curve profile.
The invention is not limited to the described embodiments.

Claims (10)

1. A valve (1) for metering a fluid, in particular a fuel injection valve for an internal combustion engine, having an actuator (2) and a valve needle (15) which can be actuated by the actuator (2) along a longitudinal axis (8), wherein an armature (4) of the actuator (2) is arranged on the valve needle (15), wherein the armature (4) can be displaced relative to the valve needle (15) in accordance with an armature free travel (20) along the longitudinal axis (8), and wherein at least one stop element (16) which is arranged on the valve needle (15) is provided, the stop element (16) limiting the displacement of the armature (4) relative to the valve needle (15),
it is characterized in that the preparation method is characterized in that,
a wear edge (24) is provided, on which a contact (26) between the armature (4) and the stop element (16) occurs during operation, in order to limit a displacement of the armature (4) relative to the valve needle (15).
2. The valve as set forth in claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
the wear edge (24) is formed on the stop element (16).
3. The valve as set forth in claim 2, wherein,
it is characterized in that the preparation method is characterized in that,
a stop element surface (22) is arranged on the stop element (16) and faces the armature (4), and the wear edge (24) is arranged radially on the stop element surface (22) in an outward manner.
4. The valve according to claim 2 or 3,
it is characterized in that the preparation method is characterized in that,
the armature (4) is wear-resistant at least in a region (25) of its end face (23) facing the stop element (16), in which region during operation contact (26) occurs between the wear-resistant edges of the armature (4) and the stop (25).
5. The valve according to any one of claims 1 to 4,
it is characterized in that the preparation method is characterized in that,
the stop element (16) is configured relative to an end face (23) of the armature (4) facing the stop element surface (22) in such a way that a dynamic hydraulic damping of the displacement of the armature (4) is at least substantially predominant compared to a viscous damping of the displacement of the armature (4).
6. The valve as set forth in claim 5, wherein,
it is characterized in that the preparation method is characterized in that,
the stop element surface (22) of the stop element (16) facing the end face (23) of the armature (4) is formed by means of a taper (43) and/or at least one step (45) in such a way that, when contact (26) occurs between the armature (4) and the stop element (16), a geometric shape of the damping chamber (26), in particular an average height of the damping chamber (26) along the longitudinal axis (8), is obtained between the stop element surface (22) of the stop element (16) and the end face (23) of the armature (4), in which case the hydrodynamic damping of a displacement of the armature (4) is at least substantially dominant compared to the viscous damping of a displacement of the armature (4).
7. The valve according to any one of claims 1 to 6,
it is characterized in that the preparation method is characterized in that,
a coating (21) is provided on the stop element (16), said coating forming a protection against wear, and the wear-resistant edge (24) is realized by the coating (21).
8. The valve as set forth in claim 7,
it is characterized in that the preparation method is characterized in that,
the coating (21) is based on hard chromium.
9. The valve according to any one of claims 1 to 8,
it is characterized in that the preparation method is characterized in that,
the wear edge (24) is configured as an at least substantially circumferentially closed circumferential edge (24), wherein an at least substantially linear contact (26) between the armature (4) and the stop element (16) can be achieved.
10. The valve according to any one of claims 1 to 9,
it is characterized in that the preparation method is characterized in that,
the armature (4) has at least one passage opening (53) through the opening (52) on its end face (23) facing away from the stop element (16), on which end face contact (26) between the armature (4) and the wear edge of the stop (25) occurs during operation, and the at least one passage opening (53) is arranged radially outside the wear edge (24) on the end face (23).
CN202010984643.XA 2019-09-19 2020-09-18 Valve for metering fluids Pending CN112523908A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019214259.1 2019-09-19
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1714235A (en) * 2002-12-04 2005-12-28 罗伯特·博世有限公司 Fuel-injection valve
JP2007309191A (en) * 2006-05-18 2007-11-29 Denso Corp Fuel supply pump
CN102506217A (en) * 2011-10-21 2012-06-20 沈阳化工大学 Proportional electromagnetic valve for electrically controlled high-pressure common-rail fuel injection system of diesel engine
CN103104389A (en) * 2011-11-11 2013-05-15 株式会社京浜 Electromagnetic type fuel injection valve
CN103711619A (en) * 2012-09-29 2014-04-09 重庆长安汽车股份有限公司 Filter element and shell sealing structure of air filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1714235A (en) * 2002-12-04 2005-12-28 罗伯特·博世有限公司 Fuel-injection valve
JP2007309191A (en) * 2006-05-18 2007-11-29 Denso Corp Fuel supply pump
CN102506217A (en) * 2011-10-21 2012-06-20 沈阳化工大学 Proportional electromagnetic valve for electrically controlled high-pressure common-rail fuel injection system of diesel engine
CN103104389A (en) * 2011-11-11 2013-05-15 株式会社京浜 Electromagnetic type fuel injection valve
CN103711619A (en) * 2012-09-29 2014-04-09 重庆长安汽车股份有限公司 Filter element and shell sealing structure of air filter

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