EP3346123A1 - Electromagnetic switching valve and high-pressure fuel pump for a fuel injection system of a combustion engine - Google Patents

Electromagnetic switching valve and high-pressure fuel pump for a fuel injection system of a combustion engine Download PDF

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Publication number
EP3346123A1
EP3346123A1 EP17150804.7A EP17150804A EP3346123A1 EP 3346123 A1 EP3346123 A1 EP 3346123A1 EP 17150804 A EP17150804 A EP 17150804A EP 3346123 A1 EP3346123 A1 EP 3346123A1
Authority
EP
European Patent Office
Prior art keywords
switching valve
electromagnetic switching
sleeve
bulge
wall 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.)
Granted
Application number
EP17150804.7A
Other languages
German (de)
French (fr)
Other versions
EP3346123B1 (en
Inventor
Stephan BIAS
Jürgen Bohmann
Burhan Dagdelen
Christian Sturm
Andreas Mühlbauer
Valentin Veit
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.)
Vitesco Technologies 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 EP17150804.7A priority Critical patent/EP3346123B1/en
Publication of EP3346123A1 publication Critical patent/EP3346123A1/en
Application granted granted Critical
Publication of EP3346123B1 publication Critical patent/EP3346123B1/en
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Anticipated expiration legal-status Critical

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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
    • 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
    • F02M2200/09—Fuel-injection apparatus having means for reducing noise
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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

Definitions

  • the invention relates to an electromagnetic switching valve for a fuel injection system of an internal combustion engine, as well as a high-pressure fuel pump having such an electromagnetic switching valve.
  • High-pressure fuel pumps in fuel injection systems in internal combustion engines are used to pressurize a high-pressure fuel, the pressure is for example in gasoline internal combustion engines in a range of 150 bar to 400 bar and diesel engines in a range of 1500 bar to 2500 bar , The higher the pressure that can be generated in the respective fuel, the lower are emissions that occur during combustion of the fuel in a combustion chamber, which is particularly advantageous against the background that a reduction of emissions is increasingly desired.
  • valve assemblies may be provided at various positions along the path that the fuel takes from a tank to the respective combustion chamber, for example as an intake valve on a high pressure fuel pump that pressurizes the fuel, but also as a relief valve at various positions of the fuel injection system, for example For example, on a common rail that stores the pressurized fuel before injection into the combustion chamber.
  • Such electromagnetic Switching valves have a valve region which performs the valve function and which comprises a closing element and a valve seat which cooperate to close the switching valve. Furthermore, such a switching valve comprises an actuator region, which moves the closing element by means of an electromagnetic excitation in order to lift it off the valve seat or press it onto the valve seat. In order to be able to move the closing element, this actuator region has correspondingly movable elements which, at the end of the movement, strike their respective end position. In this case, a pulse is induced, which is forwarded in particular via adjacent components and emitted as sound from them. The sound is then perceived as noise.
  • the object of the invention is to provide an electromagnetic switching valve, in which a sound radiation can be reduced by adapting components of the switching valve to a minimum.
  • a high-pressure fuel pump having such an electromagnetic switching valve is the subject of the independent claim.
  • An electromagnetic switching valve for a fuel injection system of an internal combustion engine has a valve portion with a closing element and with a valve seat, which cooperate to close the switching valve on. Furthermore, the electromagnetic switching valve comprises an actuator region for moving the closing element along a movement axis into a closing or opening position, the actuator region being accommodated at least partially in a sleeve.
  • the sleeve has a front wall region arranged perpendicular to the movement axis.
  • the end wall region has at least one bulge.
  • Such a sleeve which receives elements of the actuator area, acts as a kind of speaker when elements intersect inside the sleeve.
  • sound waves are radiated particularly reinforced from the sleeve. Therefore, it is now proposed to provide a bulge in the sleeve in order to reduce a noise emission, since the sound can be transmitted less strongly by the sleeve by the geometric deformation of the front wall portion of the sleeve.
  • the bulge is formed as a convex bulge, i. the bulge is outwardly oriented away from an inner region of the sleeve.
  • the bulge as a concave bulge, wherein the bulge is formed directed towards an inner region of the sleeve.
  • the bulge in particular a spherical cap shape, since such a shape is particularly easy to manufacture.
  • the bulge is formed symmetrically about a central longitudinal axis of the sleeve, wherein the bulge is arranged on the end wall region, in particular centrally on the central longitudinal axis.
  • a plateau region is advantageous because it stabilizes the sleeve in the end wall region.
  • the actuator region comprises a fixed pole piece and an armature movable along the axis of movement, which are received together in the sleeve.
  • one of the two, pole piece or anchor is arranged directly adjacent to the frontal wall region.
  • the sleeve is accordingly shaped like a cap, the armature and pole piece receives, in such a way that armature and pole piece along the axis of movement are arranged one behind the other in the cap.
  • a gap is formed between the member, pole piece or armature disposed directly adjacent to the end wall portion in the sleeve, to form a space between the pole piece and the armature and the end wall portion, respectively.
  • the pole piece or armature and the end wall portion are arranged without contact with each other and thus decoupled, whereby a further reduction in noise can be achieved.
  • the intermediate space is filled with a sound damping material, whereby advantageously a further reduction of the sound radiation and thus a reduction of the sound level can be achieved.
  • the actuator region preferably has a coil which is arranged around the sleeve on a wall region of the sleeve extending parallel to the axis of movement.
  • the cap is therefore advantageously shaped so that the coil can easily slide over it and the coil can be held in position by the sleeve.
  • a high-pressure fuel pump for a fuel injection system of an internal combustion engine has an electromagnetic switching valve as described above, wherein a valve portion of the electromagnetic switching valve is disposed in a housing bore of the high-pressure fuel pump, wherein a sleeve which at least partially accommodates an actuator portion of the electromagnetic switching valve, is fixed in the housing bore and a Has frontal wall portion which protrudes into an environment of the high-pressure fuel pump.
  • the sleeve in particular acts as a loudspeaker when it is not shielded, but protrudes into an environment, so that a pulse which arises within the sleeve is emitted as sound from the sleeve as speaker to the outside.
  • Fig. 1 shows a schematic overview of a fuel injection system 10 of an internal combustion engine, which promotes a fuel 12 from a tank 14 via a prefeed pump 16, a high-pressure fuel pump 18 and a high-pressure fuel storage 20 to injectors 22, which then inject the fuel 12 into combustion chambers of the internal combustion engine.
  • the fuel 12 is introduced via an inlet valve 24 into the high-pressure fuel pump 18, pressurized via an outlet valve 26 out of the high-pressure fuel pump 18, and fed to the high-pressure fuel accumulator 20.
  • a pressure control valve 28 is arranged to control the pressure of the fuel 12 in the high-pressure fuel storage 20 can.
  • Both the inlet valve 24 and the outlet valve 26 and the pressure control valve 28 may be formed as an electromagnetic switching valve 30 and therefore operated actively.
  • Fig. 2 shows a longitudinal sectional view through the high-pressure fuel pump 18 from Fig. 1 with an intake valve 24 formed as an electromagnetic switching valve 30 as an example of a position to which the electromagnetic switching valve 30 may be attached.
  • an intake valve 24 formed as an electromagnetic switching valve 30 as an example of a position to which the electromagnetic switching valve 30 may be attached.
  • a switching valve 30 which will be described below, at the other mentioned positions, namely as an exhaust valve 26 or as a pressure regulating valve 28, disposed in the fuel injection system 10.
  • the electromagnetic switching valve 30 is disposed in a housing bore 32 of a housing 34 of the high-pressure fuel pump 18.
  • the electromagnetic switching valve 30 has a valve region 36 and an actuator region 38, wherein the actuator region 38 has a fixed pole piece 40, an armature 44 movable along a movement axis 42, and a coil 46.
  • the valve region 36 comprises a valve seat 48 and a closing element 50, which cooperate to close the electromagnetic switching valve 30.
  • the electromagnetic switching valve 30 is shown in greater detail in two different embodiments Fig. 2 and Fig. 5 each shown in a longitudinal sectional view.
  • Parts of the actuator region 38 namely in particular the pole piece 40 and the armature 44, are held in a sleeve 52 which receives the armature 44 and the pole piece 40 with a wall region 54 extending parallel to the movement axis 42.
  • the sleeve 52 is also secured to the housing bore 32 at an open end portion 56 of the parallel wall portion 54.
  • the sleeve is closed along the movement axis 42 opposite the open end region 56 with an end wall region 58, and protrudes into an environment 60 of the high-pressure fuel pump 18, which is located outside of the housing 34.
  • the coil 46 is housed in a coil housing 62 which is slid over the sleeve 52, so that the coil 46 is arranged around the sleeve 52 on the wall region 54 extending parallel to the movement axis 42.
  • the sleeve 52 therefore does not take all elements of the actuator area 38 in on its inside, since the coil 46, which is also part of the actuator area 38, is arranged outside the sleeve 52.
  • the sleeve 52 has in all embodiments at its front wall portion 58 a bulge 64.
  • This bulge may for example have a spherical cap shape and is, as in the perspective view of the sleeve 52 in Fig. 4 shown symmetrically about a central longitudinal axis 66 of the sleeve 52, and arranged centrally on the central longitudinal axis 66 at the end wall portion 58. Adjacent to the bulge 64, in all the embodiments shown, the end wall region 58 has a flat plateau region 68, which is arranged perpendicular to the movement axis 42.
  • the bulge 64 in the sleeve 52 may be formed in various embodiments, two of which are shown and described below.
  • the bulge 64 is formed as a concave bulge 64 and therefore bulges inwardly in the direction of the pole piece 40, which is located inside the sleeve 52.
  • the bulge 64 bulges outwardly away from the pole piece 40 to form a convex bulge 64.
  • bulge 64 is provided in the end wall portion 58 of the sleeve 52, but that a plurality of bulges 64 are provided. These may be arranged, for example symmetrically about the central longitudinal axis 66 annular, but it is also conceivable, an entire surface of the end wall portion 58 with a plurality To provide bulges 64, which form a waveform on the front wall portion.
  • the pole piece 40 is arranged at a distance from the front-side wall region 58, so that a gap 70 is formed between the pole piece 40 and the front-side wall region 58. This gap further reduces the sound radiation of the sleeve 52 in the environment 60, in particular when it is filled with a sound damping material 72.
  • FIG Fig. 5 Although such a space 70 in the second embodiment is shown in FIG Fig. 5 is not shown here, such a gap 70 between the pole piece 40 and frontal wall portion 58, also filled with a sound damping material 72 may be provided.
  • pole piece 40 is not the element that is directly adjacent to the end wall region 58, but rather the armature 44.
  • Fig. 4 respectively.
  • Fig. 6 show schematically the two embodiments of the sleeve 52, once in a perspective view and once in a side view, each without the other said elements of the electromagnetic switching valve 30th
  • the fast-switching solenoid valves ie those described above as the electromagnetic switching valves 30, for volume flow and / or pressure control.
  • the armature 44 of the electromagnetic switching valve 30 strikes, for example, during opening or during closing in the respective end position.
  • the induced pulse is across the adjacent components forwarded and radiated as sound from these, the sound is perceived as noise.
  • the anchor 44 in the pole piece 40 the sleeve 52 is excited and acts as a kind of speaker when emitting the sound waves.
  • the sleeve 52 is provided by means of suitable Umformoperationen with a geometrically defined bulge 64, wherein the bulge 64 can be oriented both in the direction of the pole piece 40 inwardly and outwardly to reduce noise emissions as a result of the actuator movement.
  • the geometric deformation of the sleeve 52 on the end wall portion 58, the noise emission and thus the noise level is lowered.
  • the sound damping material 72 in the gap 70 leads to a further reduction of the sound radiation and thus to a reduction of the sound level.

Abstract

Die Erfindung betrifft ein elektromagnetisches Schaltventil (30), das einen in einer Hülse (52) aufgenommenen Aktuatorbereich (38) aufweist, wobei die Hülse (52) einen stirnseitigen Wandbereich (58) aufweist, der eine Ausbuchtung (64) umfasst. Weiter betrifft die Erfindung eine Kraftstoffhochdruckpumpe (18), die ein solches elektromagnetisches Schaltventil (30) aufweist.

Figure imgaf001
The invention relates to an electromagnetic switching valve (30) which has an actuator region (38) accommodated in a sleeve (52), the sleeve (52) having an end wall region (58) which comprises a bulge (64). Furthermore, the invention relates to a high-pressure fuel pump (18) having such an electromagnetic switching valve (30).
Figure imgaf001

Description

Die Erfindung betrifft ein elektromagnetisches Schaltventil für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, sowie eine Kraftstoffhochdruckpumpe, die ein solches elektromagnetisches Schaltventil aufweist.The invention relates to an electromagnetic switching valve for a fuel injection system of an internal combustion engine, as well as a high-pressure fuel pump having such an electromagnetic switching valve.

Kraftstoffhochdruckpumpen in Kraftstoffeinspritzsystemen in Brennkraftmaschinen werden dazu verwendet, einen Kraftstoff mit einem hohen Druck zu beaufschlagen, wobei der Druck beispielsweise bei Benzin-Brennkraftmaschinen in einem Bereich von 150 bar bis 400 bar und bei Diesel-Brennkraftmaschinen in einem Bereich von 1500 bar bis 2500 bar liegt. Je höher der Druck, der in dem jeweiligen Kraftstoff erzeugt werden kann, desto geringer sind Emissionen, die während der Verbrennung des Kraftstoffes in einer Brennkammer entstehen, was insbesondere vor dem Hintergrund vorteilhaft ist, dass eine Verringerung von Emissionen immer stärker gewünscht wird.High-pressure fuel pumps in fuel injection systems in internal combustion engines are used to pressurize a high-pressure fuel, the pressure is for example in gasoline internal combustion engines in a range of 150 bar to 400 bar and diesel engines in a range of 1500 bar to 2500 bar , The higher the pressure that can be generated in the respective fuel, the lower are emissions that occur during combustion of the fuel in a combustion chamber, which is particularly advantageous against the background that a reduction of emissions is increasingly desired.

In dem Kraftstoffeinspritzsystem können an verschiedenen Positionen des Weges, den der Kraftstoff von einem Tank zu der jeweiligen Brennkammer nimmt, Ventilanordnungen vorgesehen sein, beispielsweise als Einlassventil an einer Kraftstoffhochdruckpumpe, die den Kraftstoff mit Druck beaufschlagt, aber auch beispielsweise als Entlastungsventil an verschiedensten Positionen des Kraftstoffeinspritzsystems, beispielsweise an einem Common-Rail, das den druckbeaufschlagten Kraftstoff vor der Einspritzung in die Brennkammer speichert.In the fuel injection system, valve assemblies may be provided at various positions along the path that the fuel takes from a tank to the respective combustion chamber, for example as an intake valve on a high pressure fuel pump that pressurizes the fuel, but also as a relief valve at various positions of the fuel injection system, for example For example, on a common rail that stores the pressurized fuel before injection into the combustion chamber.

Häufig werden hierzu schnellschaltende Magnetventile zur Volumenstrom- und/oder Druckregelung eingesetzt. Solche elektromagnetischen Schaltventile weisen einen Ventilbereich auf, der die Ventilfunktion übernimmt, und der ein Schließelement und einen Ventilsitz umfasst, die zum Schließen des Schaltventils zusammenwirken. Weiter umfasst ein solches Schaltventil einen Aktuatorbereich, der durch eine elektromagnetische Anregung das Schließelement bewegt, um es vom Ventilsitz abzuheben bzw. auf den Ventilsitz zu drücken. Um das Schließelement bewegen zu können, weist dieser Aktuatorbereich entsprechend bewegliche Elemente auf, die am Ende der Bewegung in ihre jeweilige Endlage einschlagen. Dabei wird ein Impuls induziert, der insbesondere über benachbarte Bauteile weitergeleitet und als Schall von diesen abgestrahlt wird. Der Schall wird dann als Lärm wahrgenommen.Frequently fast-switching solenoid valves for volume flow and / or pressure control are used for this purpose. Such electromagnetic Switching valves have a valve region which performs the valve function and which comprises a closing element and a valve seat which cooperate to close the switching valve. Furthermore, such a switching valve comprises an actuator region, which moves the closing element by means of an electromagnetic excitation in order to lift it off the valve seat or press it onto the valve seat. In order to be able to move the closing element, this actuator region has correspondingly movable elements which, at the end of the movement, strike their respective end position. In this case, a pulse is induced, which is forwarded in particular via adjacent components and emitted as sound from them. The sound is then perceived as noise.

Bisher wurde diesem Problem begegnet, indem ein Bestromungsprofil des elektromagnetischen Schaltventiles derart angepasst wurde, dass ein minimaler Impuls der sich bewegenden Elemente auf die Elemente, in denen sie einschlagen, entsteht, wobei gleichzeitig eine notwendig zu erreichende Funktion des Schaltventiles erhalten bleibt. Dies macht jedoch einen Eingriff in die Software bzw. die Ansteuerung des elektromagnetischen Schaltventiles erforderlich.So far, this problem has been addressed by a Bestromungsprofil the electromagnetic switching valve has been adjusted so that a minimal impulse of the moving elements on the elements in which they strike, while maintaining a necessary to be achieved function of the switching valve is maintained. However, this requires an intervention in the software or the control of the electromagnetic switching valve required.

Aufgabe der Erfindung ist es, ein elektromagnetisches Schaltventil bereitzustellen, bei dem eine Schallabstrahlung unter Anpassung von Bauteilen des Schaltventiles auf ein Minimum reduziert werden kann.The object of the invention is to provide an electromagnetic switching valve, in which a sound radiation can be reduced by adapting components of the switching valve to a minimum.

Diese Aufgabe wird mit einem elektromagnetischen Schaltventil mit der Merkmalskombination des Anspruches 1 gelöst.This object is achieved with an electromagnetic switching valve with the feature combination of claim 1.

Eine Kraftstoffhochdruckpumpe, die ein solches elektromagnetisches Schaltventil aufweist, ist Gegenstand des nebengeordneten Anspruchs.A high-pressure fuel pump having such an electromagnetic switching valve is the subject of the independent claim.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der abhängigen Ansprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Ein elektromagnetisches Schaltventil für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine weist einen Ventilbereich mit einem Schließelement und mit einem Ventilsitz, die zum Schließen des Schaltventiles zusammenwirken, auf. Weiter umfasst das elektromagnetische Schaltventil einen Aktuatorbereich zum Bewegen des Schließelementes entlang einer Bewegungsachse in einen Schließ- oder Öffnungsposition, wobei der Aktuatorbereich zumindest teilweise in einer Hülse aufgenommen ist. Die Hülse weist einen senkrecht zu der Bewegungsachse angeordneten stirnseitigen Wandbereich auf. Der stirnseitige Wandbereich weist wenigstens eine Ausbuchtung auf.An electromagnetic switching valve for a fuel injection system of an internal combustion engine has a valve portion with a closing element and with a valve seat, which cooperate to close the switching valve on. Furthermore, the electromagnetic switching valve comprises an actuator region for moving the closing element along a movement axis into a closing or opening position, the actuator region being accommodated at least partially in a sleeve. The sleeve has a front wall region arranged perpendicular to the movement axis. The end wall region has at least one bulge.

Eine solche Hülse, die Elemente des Aktuatorbereiches aufnimmt, wirkt als eine Art Lautsprecher, wenn im Inneren der Hülse Elemente ineinanderschlagen. Dadurch werden Schallwellen besonders verstärkt von der Hülse abgestrahlt. Daher wird nun vorgeschlagen, in der Hülse eine Ausbuchtung vorzusehen, um eine Schallemission zu reduzieren, da der Schall durch die geometrische Verformung des stirnseitigen Wandbereiches der Hülse weniger stark von der Hülse weitergeleitet werden kann.Such a sleeve, which receives elements of the actuator area, acts as a kind of speaker when elements intersect inside the sleeve. As a result, sound waves are radiated particularly reinforced from the sleeve. Therefore, it is now proposed to provide a bulge in the sleeve in order to reduce a noise emission, since the sound can be transmitted less strongly by the sleeve by the geometric deformation of the front wall portion of the sleeve.

Vorzugsweise ist die Ausbuchtung als konvexe Ausbuchtung ausgebildet, d.h. die Ausbuchtung ist nach außen von einem Innenbereich der Hülse weg orientiert ausgebildet.Preferably, the bulge is formed as a convex bulge, i. the bulge is outwardly oriented away from an inner region of the sleeve.

Alternativ ist es auch möglich, die Ausbuchtung als konkave Ausbuchtung auszubilden, wobei die Ausbuchtung zu einem Innenbereich der Hülse hin gerichtet ausgeformt ist.Alternatively, it is also possible to form the bulge as a concave bulge, wherein the bulge is formed directed towards an inner region of the sleeve.

In beiden Ausführungsformen weist die Ausbuchtung insbesondere eine Kugelkalottenform auf, da eine solche Form besonders einfach herzustellen ist.In both embodiments, the bulge in particular a spherical cap shape, since such a shape is particularly easy to manufacture.

Es ist jedoch auch denkbar, mehrere Ausbuchtungen an dem stirnseitigen Wandbereich der Hülse vorzusehen, um eine noch stärkere Dämpfung der Schallemission von der Hülse her zu erreichen.However, it is also conceivable to provide a plurality of protrusions on the end wall portion of the sleeve in order to achieve even greater attenuation of the sound emission from the sleeve forth.

Vorzugsweise ist die Ausbuchtung symmetrisch um eine Mittellängsachse der Hülse ausgebildet, wobei die Ausbuchtung an dem stirnseitigen Wandbereich insbesondere zentral an der Mittellängsachse angeordnet ist.Preferably, the bulge is formed symmetrically about a central longitudinal axis of the sleeve, wherein the bulge is arranged on the end wall region, in particular centrally on the central longitudinal axis.

Sind beispielsweise mehrere Ausbuchtungen an dem stirnseitigen Wandbereich ausgebildet, ist es möglich, diese ringförmig um die Mittellängsachse vorzusehen.If, for example, a plurality of bulges are formed on the end wall region, it is possible to provide them annularly around the central longitudinal axis.

In einer alternativen Ausgestaltung ist es jedoch auch möglich, auch mehrere Ausbuchtungen wellenförmig über die Fläche des stirnseitigen Wandbereiches verteilt anzuordnen.In an alternative embodiment, however, it is also possible to arrange a plurality of bulges distributed wavy over the surface of the front wall portion.

Vorzugsweise weist der stirnseitige Wandbereich benachbart zu der Ausbuchtung einen flachen, senkrecht zu der Bewegungsachse angeordneten Plateaubereich auf. Ein solcher Plateaubereich ist vorteilhaft, da er die Hülse im stirnseitigen Wandbereich stabilisiert.Preferably, the end wall region adjacent to the bulge on a flat, perpendicular to the axis of movement arranged Plateaubereich. Such a plateau region is advantageous because it stabilizes the sleeve in the end wall region.

Vorzugsweise weist der Aktuatorbereich ein feststehendes Polstück und einen entlang der Bewegungsachse beweglichen Anker auf, die gemeinsam in der Hülse aufgenommen sind.Preferably, the actuator region comprises a fixed pole piece and an armature movable along the axis of movement, which are received together in the sleeve.

Dabei ist eines der beiden, Polstück oder Anker, direkt benachbart zu dem stirnseitigen Wandbereich angeordnet. Die Hülse ist demgemäß ähnlich einer Kappe geformt, die Anker und Polstück aufnimmt, und zwar derart, dass Anker und Polstück entlang der Bewegungsachse hintereinander in der Kappe angeordnet sind.In this case, one of the two, pole piece or anchor, is arranged directly adjacent to the frontal wall region. The sleeve is accordingly shaped like a cap, the armature and pole piece receives, in such a way that armature and pole piece along the axis of movement are arranged one behind the other in the cap.

Vorzugsweise ist zwischen dem Element, Polstück oder Anker, das direkt benachbart zu dem stirnseitigen Wandbereich in der Hülse angeordnet ist, ein Zwischenraum ausgebildet, um einen Abstand zwischen dem Polstück bzw. dem Anker und dem stirnseitigen Wandbereich zu bilden. Dadurch sind Polstück bzw. Anker und der stirnseitige Wandbereich ohne Kontakt zueinander und somit entkoppelt angeordnet, wodurch eine weitere Schallreduktion erreicht werden kann.Preferably, a gap is formed between the member, pole piece or armature disposed directly adjacent to the end wall portion in the sleeve, to form a space between the pole piece and the armature and the end wall portion, respectively. As a result, the pole piece or armature and the end wall portion are arranged without contact with each other and thus decoupled, whereby a further reduction in noise can be achieved.

Besonders bevorzugt ist der Zwischenraum mit einem Schalldämpfungsmaterial gefüllt, wodurch vorteilhaft eine weitere Reduzierung der Schallabstrahlung und somit eine Reduktion des Schallpegels erreicht werden kann.Particularly preferably, the intermediate space is filled with a sound damping material, whereby advantageously a further reduction of the sound radiation and thus a reduction of the sound level can be achieved.

Vorzugsweise weist der Aktuatorbereich eine Spule auf, die um die Hülse herum an einem sich parallel zu der Bewegungsachse erstreckenden Wandbereich der Hülse angeordnet ist. Die Kappe ist daher vorteilhaft so geformt, dass sich die Spule leicht darüber schieben lässt und die Spule durch die Hülse in Position gehalten werden kann.The actuator region preferably has a coil which is arranged around the sleeve on a wall region of the sleeve extending parallel to the axis of movement. The cap is therefore advantageously shaped so that the coil can easily slide over it and the coil can be held in position by the sleeve.

Eine Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine weist ein oben beschriebenes elektromagnetisches Schaltventil auf, wobei ein Ventilbereich des elektromagnetischen Schaltventils in einer Gehäusebohrung der Kraftstoffhochdruckpumpe angeordnet ist, wobei eine Hülse, die einen Aktuatorbereich des elektromagnetischen Schaltventils zumindest teilweise aufnimmt, in der Gehäusebohrung befestigt ist und einen stirnseitigen Wandbereich aufweist, der in eine Umgebung der Kraftstoffhochdruckpumpe hervorsteht.A high-pressure fuel pump for a fuel injection system of an internal combustion engine has an electromagnetic switching valve as described above, wherein a valve portion of the electromagnetic switching valve is disposed in a housing bore of the high-pressure fuel pump, wherein a sleeve which at least partially accommodates an actuator portion of the electromagnetic switching valve, is fixed in the housing bore and a Has frontal wall portion which protrudes into an environment of the high-pressure fuel pump.

Die Hülse wirkt insbesondere dann als Lautsprecher, wenn sie nicht abgeschirmt ist, sondern in eine Umgebung hervorsteht, so dass ein Impuls, der innerhalb der Hülse entsteht, als Schall von der Hülse als Lautsprecher nach außen abgestrahlt wird.The sleeve in particular acts as a loudspeaker when it is not shielded, but protrudes into an environment, so that a pulse which arises within the sleeve is emitted as sound from the sleeve as speaker to the outside.

Daher ist es besonders vorteilhaft, wenn eine solche Hülse, die in eine Umgebung der Kraftstoffhochdruckpumpe hervorsteht, eine geometrische Verformung wie oben beschrieben an dem stirnseitigen Wandbereich aufweist, der normalerweise als Lautsprecher funktionieren würde. So kann eine Geräuschentwicklung der Kraftstoffhochdruckpumpe insgesamt verringert werden.Therefore, it is particularly advantageous if such a sleeve, which protrudes into an environment of the high-pressure fuel pump, has a geometric deformation as described above at the end wall portion, which would normally work as a speaker. Thus, a noise development of the high-pressure fuel pump can be reduced overall.

Vorteilhafte Ausgestaltungen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Darin zeigt:

Fig. 1
eine schematische Übersichtsdarstellung eines Kraftstoffeinspritzsystems einer Brennkraftmaschine, das an verschiedenen Positionen ein elektromagnetisches Schaltventil aufweisen kann;
Fig. 2
eine Längsschnittdarstellung einer Kraftstoffhochdruckpumpe in dem Kraftstoffeinspritzsystem aus Fig. 1, die ein elektromagnetisches Schaltventil als Einlassventil aufweist;
Fig. 3
eine Längsschnittdarstellung durch eine erste Ausführungsform des elektromagnetischen Schaltventiles, das in Fig. 1 bzw. Fig. 2 gezeigt ist, und das eine Hülse aufweist;
Fig. 4
eine perspektivische Darstellung der Hülse aus Fig. 3;
Fig. 5
eine Längsschnittdarstellung durch eine zweite Ausführungsform des elektromagnetischen Schaltventiles, das in Fig. 1 und Fig. 2 dargestellt ist, und das eine Hülse aufweist;
Fig. 6
eine Seitenansicht auf die Hülse aus Fig. 5.
Advantageous embodiments of the invention will be explained in more detail with reference to the accompanying drawings. It shows:
Fig. 1
a schematic overview of a fuel injection system of an internal combustion engine, which may have an electromagnetic switching valve at various positions;
Fig. 2
a longitudinal sectional view of a high-pressure fuel pump in the fuel injection system Fig. 1 having an electromagnetic switching valve as an inlet valve;
Fig. 3
a longitudinal sectional view of a first embodiment of the electromagnetic switching valve, the in Fig. 1 respectively. Fig. 2 is shown, and having a sleeve;
Fig. 4
a perspective view of the sleeve Fig. 3 ;
Fig. 5
a longitudinal sectional view of a second embodiment of the electromagnetic switching valve, which in Fig. 1 and Fig. 2 is shown, and having a sleeve;
Fig. 6
a side view of the sleeve Fig. 5 ,

Fig. 1 zeigt eine schematische Übersichtsdarstellung eines Kraftstoffeinspritzsystems 10 einer Brennkraftmaschine, das einen Kraftstoff 12 aus einem Tank 14 über eine Vorförderpumpe 16, eine Kraftstoffhochdruckpumpe 18 und einen Kraftstoffhochdruckspeicher 20 zu Injektoren 22 fördert, die den Kraftstoff 12 dann in Brennräume der Brennkraftmaschine einspritzen. Fig. 1 shows a schematic overview of a fuel injection system 10 of an internal combustion engine, which promotes a fuel 12 from a tank 14 via a prefeed pump 16, a high-pressure fuel pump 18 and a high-pressure fuel storage 20 to injectors 22, which then inject the fuel 12 into combustion chambers of the internal combustion engine.

Der Kraftstoff 12 wird über ein Einlassventil 24 in die Kraftstoffhochdruckpumpe 18 eingebracht, über ein Auslassventil 26 druckbeaufschlagt aus der Kraftstoffhochdruckpumpe 18 herausgelassen, und dem Kraftstoffhochdruckspeicher 20 zugeführt. An dem Kraftstoffhochdruckspeicher 20 ist ein Druckregelventil 28 angeordnet, um den Druck des Kraftstoffes 12 in dem Kraftstoffhochdruckspeicher 20 regeln zu können.The fuel 12 is introduced via an inlet valve 24 into the high-pressure fuel pump 18, pressurized via an outlet valve 26 out of the high-pressure fuel pump 18, and fed to the high-pressure fuel accumulator 20. At the high-pressure fuel storage 20, a pressure control valve 28 is arranged to control the pressure of the fuel 12 in the high-pressure fuel storage 20 can.

Sowohl das Einlassventil 24 als auch das Auslassventil 26 als auch das Druckregelventil 28 können als elektromagnetisches Schaltventil 30 ausgebildet sein und daher aktiv betrieben werden.Both the inlet valve 24 and the outlet valve 26 and the pressure control valve 28 may be formed as an electromagnetic switching valve 30 and therefore operated actively.

Fig. 2 zeigt eine Längsschnittdarstellung durch die Kraftstoffhochdruckpumpe 18 aus Fig. 1 mit einem als elektromagnetisches Schaltventil 30 ausgebildeten Einlassventil 24 als Beispiel für eine Position, an der das elektromagnetische Schaltventil 30 angebracht sein kann. Es ist jedoch auch denkbar, dass ein solches Schaltventil 30, das im Folgenden beschrieben wird, an den anderen genannten Positionen, nämlich als Auslassventil 26 oder als Druckregelventil 28, in dem Kraftstoffeinspritzsystem 10 angeordnet ist. Fig. 2 shows a longitudinal sectional view through the high-pressure fuel pump 18 from Fig. 1 with an intake valve 24 formed as an electromagnetic switching valve 30 as an example of a position to which the electromagnetic switching valve 30 may be attached. However, it is also conceivable that such a switching valve 30, which will be described below, at the other mentioned positions, namely as an exhaust valve 26 or as a pressure regulating valve 28, disposed in the fuel injection system 10.

In dem vorliegenden Ausführungsbeispiel in Fig. 2 ist das elektromagnetische Schaltventil 30 in einer Gehäusebohrung 32 eines Gehäuses 34 der Kraftstoffhochdruckpumpe 18 angeordnet. Das elektromagnetische Schaltventil 30 weist einen Ventilbereich 36 und einen Aktuatorbereich 38 auf, wobei der Aktuatorbereich 38 ein feststehendes Polstück 40, einen entlang einer Bewegungsachse 42 beweglichen Anker 44 und eine Spule 46 aufweist. Der Ventilbereich 36 umfasst einen Ventilsitz 48 und ein Schließelement 50, die zum Schließen des elektromagnetischen Schaltventiles 30 zusammenwirken.In the present embodiment in Fig. 2 the electromagnetic switching valve 30 is disposed in a housing bore 32 of a housing 34 of the high-pressure fuel pump 18. The electromagnetic switching valve 30 has a valve region 36 and an actuator region 38, wherein the actuator region 38 has a fixed pole piece 40, an armature 44 movable along a movement axis 42, and a coil 46. The valve region 36 comprises a valve seat 48 and a closing element 50, which cooperate to close the electromagnetic switching valve 30.

Das elektromagnetische Schaltventil 30 ist in größerem Detail in zwei unterschiedlichen Ausführungsformen in Fig. 2 und Fig. 5 jeweils in einer Längsschnittdarstellung gezeigt.The electromagnetic switching valve 30 is shown in greater detail in two different embodiments Fig. 2 and Fig. 5 each shown in a longitudinal sectional view.

Im Folgenden sollen zunächst die gemeinsamen Merkmale der beiden Ausführungsformen in Fig. 3 und Fig. 5 beschrieben werden.The following are intended to illustrate the common features of the two embodiments Fig. 3 and Fig. 5 to be discribed.

Wie in beiden Ausführungsformen ersichtlich ist, ist jeweils der Ventilbereich 36, d. h. das Schließelement 50 und der Ventilsitz 48, in der Gehäusebohrung 32 der Kraftstoffhochdruckpumpe 18 befestigt.As can be seen in both embodiments, each of the valve region 36, d. H. the closing element 50 and the valve seat 48, mounted in the housing bore 32 of the high-pressure fuel pump 18.

Teile des Aktuatorbereiches 38, nämlich insbesondere das Polstück 40 und der Anker 44, sind in einer Hülse 52 gehalten, die mit einem parallel zu der Bewegungsachse 42 sich erstreckenden Wandbereich 54 den Anker 44 und das Polstück 40 aufnimmt. Die Hülse 52 ist an einem offenen Endbereich 56 des parallelen Wandbereiches 54 ebenfalls in der Gehäusebohrung 32 befestigt. Die Hülse ist entlang der Bewegungsachse 42 gegenüberliegend des offenen Endbereiches 56 mit einem stirnseitigen Wandbereich 58 verschlossen, und steht in eine Umgebung 60 der Kraftstoffhochdruckpumpe 18 hervor, die sich außerhalb des Gehäuses 34 befindet. Die Spule 46 ist in einem Spulengehäuse 62 untergebracht, das über die Hülse 52 geschoben ist, so dass die Spule 46 um die Hülse 52 herum an dem sich parallel zu der Bewegungsachse 42 erstreckenden Wandbereich 54 angeordnet ist. Die Hülse 52 nimmt daher nicht sämtliche Elemente des Aktuatorbereiches 38 in ihrem Inneren auf, da die Spule 46, die ebenfalls Teil des Aktuatorbereiches 38 ist, außerhalb der Hülse 52 angeordnet ist.Parts of the actuator region 38, namely in particular the pole piece 40 and the armature 44, are held in a sleeve 52 which receives the armature 44 and the pole piece 40 with a wall region 54 extending parallel to the movement axis 42. The sleeve 52 is also secured to the housing bore 32 at an open end portion 56 of the parallel wall portion 54. The sleeve is closed along the movement axis 42 opposite the open end region 56 with an end wall region 58, and protrudes into an environment 60 of the high-pressure fuel pump 18, which is located outside of the housing 34. The coil 46 is housed in a coil housing 62 which is slid over the sleeve 52, so that the coil 46 is arranged around the sleeve 52 on the wall region 54 extending parallel to the movement axis 42. The sleeve 52 therefore does not take all elements of the actuator area 38 in on its inside, since the coil 46, which is also part of the actuator area 38, is arranged outside the sleeve 52.

Die Hülse 52 weist in allen Ausführungsformen an ihrem stirnseitigen Wandbereich 58 eine Ausbuchtung 64 auf.The sleeve 52 has in all embodiments at its front wall portion 58 a bulge 64.

Diese Ausbuchtung kann beispielsweise eine Kugelkalottenform haben und ist, wie in der perspektivischen Darstellung der Hülse 52 in Fig. 4 gezeigt, symmetrisch um eine Mittellängsachse 66 der Hülse 52 ausgebildet, und zentral an der Mittellängsachse 66 an dem stirnseitigen Wandbereich 58 angeordnet. Benachbart zu der Ausbuchtung 64 weist der stirnseitige Wandbereich 58 in allen gezeigten Ausführungsformen einen flachen Plateaubereich 68 auf, der senkrecht zu der Bewegungsachse 42 angeordnet ist.This bulge may for example have a spherical cap shape and is, as in the perspective view of the sleeve 52 in Fig. 4 shown symmetrically about a central longitudinal axis 66 of the sleeve 52, and arranged centrally on the central longitudinal axis 66 at the end wall portion 58. Adjacent to the bulge 64, in all the embodiments shown, the end wall region 58 has a flat plateau region 68, which is arranged perpendicular to the movement axis 42.

Die Ausbuchtung 64 in der Hülse 52 kann dabei in verschiedenen Ausführungsformen ausgebildet sein, wovon zwei nachfolgend gezeigt und beschrieben werden.The bulge 64 in the sleeve 52 may be formed in various embodiments, two of which are shown and described below.

In der ersten Ausführungsform in Fig. 3 und Fig. 4 ist dabei die Ausbuchtung 64 als konkave Ausbuchtung 64 ausgebildet und wölbt sich daher nach innen in Richtung auf das Polstück 40, das sich im Inneren der Hülse 52 befindet.In the first embodiment in Fig. 3 and Fig. 4 In this case, the bulge 64 is formed as a concave bulge 64 and therefore bulges inwardly in the direction of the pole piece 40, which is located inside the sleeve 52.

In der zweiten Ausführungsform, die in Fig. 5 und Fig. 6 gezeigt ist, wölbt sich die Ausbuchtung 64 dagegen nach außen von dem Polstück 40 weg, so dass sie eine konvexe Ausbuchtung 64 bildet.In the second embodiment, which is in Fig. 5 and Fig. 6 on the other hand, the bulge 64 bulges outwardly away from the pole piece 40 to form a convex bulge 64.

Es ist auch denkbar, dass nicht eine einzelne Ausbuchtung 64 in dem stirnseitigen Wandbereich 58 der Hülse 52 vorgesehen ist, sondern dass mehrere Ausbuchtungen 64 vorgesehen werden. Diese können beispielsweise symmetrisch um die Mittellängsachse 66 ringförmig angeordnet sein, es ist jedoch auch denkbar, eine gesamte Fläche des stirnseitigen Wandbereiches 58 mit mehreren Ausbuchtungen 64 zu versehen, die eine Wellenform auf dem stirnseitigen Wandbereich bilden.It is also conceivable that not a single bulge 64 is provided in the end wall portion 58 of the sleeve 52, but that a plurality of bulges 64 are provided. These may be arranged, for example symmetrically about the central longitudinal axis 66 annular, but it is also conceivable, an entire surface of the end wall portion 58 with a plurality To provide bulges 64, which form a waveform on the front wall portion.

In der ersten Ausführungsform in Fig. 3 ist das Polstück 40 beabstandet zu dem stirnseitigen Wandbereich 58 angeordnet, so dass zwischen dem Polstück 40 und dem stirnseitigen Wandbereich 58 ein Zwischenraum 70 gebildet ist. Dieser Zwischenraum verringert weiter die Schallabstrahlung der Hülse 52 in die Umgebung 60, insbesondere wenn er mit einem Schalldämpfungsmaterial 72 aufgefüllt ist.In the first embodiment in Fig. 3 the pole piece 40 is arranged at a distance from the front-side wall region 58, so that a gap 70 is formed between the pole piece 40 and the front-side wall region 58. This gap further reduces the sound radiation of the sleeve 52 in the environment 60, in particular when it is filled with a sound damping material 72.

Obwohl ein solcher Zwischenraum 70 in der zweiten Ausführungsform in Fig. 5 nicht gezeigt ist, kann auch hier ein solcher Zwischenraum 70 zwischen Polstück 40 und stirnseitigem Wandbereich 58, auch aufgefüllt mit einem Schalldämpfungsmaterial 72, vorgesehen sein.Although such a space 70 in the second embodiment is shown in FIG Fig. 5 is not shown here, such a gap 70 between the pole piece 40 and frontal wall portion 58, also filled with a sound damping material 72 may be provided.

Je nach Ausbildung des elektromagnetischen Schaltventiles 30 ist es auch denkbar, dass nicht das Polstück 40 das Element ist, dass sich direkt benachbart zu dem stirnseitigen Wandbereich 58 befindet, sondern der Anker 44.Depending on the design of the electromagnetic switching valve 30, it is also conceivable that the pole piece 40 is not the element that is directly adjacent to the end wall region 58, but rather the armature 44.

Fig. 4 bzw. Fig. 6 zeigen schematisch die beiden Ausführungsformen der Hülse 52, einmal in einer perspektivischen Darstellung und einmal in einer Seitenansicht, jeweils ohne die anderen genannten Elemente des elektromagnetischen Schaltventiles 30. Fig. 4 respectively. Fig. 6 show schematically the two embodiments of the sleeve 52, once in a perspective view and once in a side view, each without the other said elements of the electromagnetic switching valve 30th

Insbesondere in Kraftstoffhochdruckpumpen 18 werden die schnellschaltenden Magnetventile, d. h. solche wie oben beschriebene elektromagnetische Schaltventile 30, zur Volumenstrom- und/oder Druckregelung eingesetzt. Dabei schlägt der Anker 44 des elektromagnetischen Schaltventiles 30 beispielsweise während des Öffnens oder während des Schließens in die jeweilige Endlage ein. Der induzierte Impuls wird über die benachbarten Bauteile weitergeleitet und als Schall von diesen abgestrahlt, wobei der Schall als Lärm wahrgenommen wird. Speziell beim Anschlag des Ankers 44 in das Polstück 40 wird die Hülse 52 angeregt und wirkt als eine Art Lautsprecher beim Abstrahlen der Schallwellen.In particular, in high-pressure fuel pumps 18, the fast-switching solenoid valves, ie those described above as the electromagnetic switching valves 30, for volume flow and / or pressure control. In this case, the armature 44 of the electromagnetic switching valve 30 strikes, for example, during opening or during closing in the respective end position. The induced pulse is across the adjacent components forwarded and radiated as sound from these, the sound is perceived as noise. Specifically, when the anchor 44 in the pole piece 40, the sleeve 52 is excited and acts as a kind of speaker when emitting the sound waves.

Es wird daher nun vorgeschlagen, bekannte Konstruktionen des elektromagnetischen Schaltventiles 30 dahingehend abzuändern, dass die Hülse 52 mittels geeigneter Umformoperationen mit einer geometrisch definierten Ausbuchtung 64 versehen wird, wobei die Ausbuchtung 64 sowohl in Richtung des Polstückes 40 nach innen als auch nach außen orientiert werden kann, um Schallemissionen in Folge der Aktuatorbewegung zu reduzieren.It is therefore now proposed to modify known constructions of the electromagnetic switching valve 30 to the effect that the sleeve 52 is provided by means of suitable Umformoperationen with a geometrically defined bulge 64, wherein the bulge 64 can be oriented both in the direction of the pole piece 40 inwardly and outwardly to reduce noise emissions as a result of the actuator movement.

Um eine weitere Schallreduktion zu erreichen, ist es vorteilhaft, wenn im zusammengebauten Zustand kein Kontakt zwischen Hülse 52 und Polstück 40 vorhanden ist, so dass die beiden Elemente mechanisch und akustisch entkoppelt sind, wobei der resultierende Zwischenraum 70 beispielsweise mit einem geeigneten Schalldämpfungsmaterial 72 versehen sein kann.In order to achieve a further reduction in noise, it is advantageous if, in the assembled state, there is no contact between sleeve 52 and pole piece 40, so that the two elements are mechanically and acoustically decoupled, the resulting gap 70 being provided, for example, with a suitable sound damping material 72 can.

Durch die geometrische Verformung der Hülse 52 an dem stirnseitigen Wandbereich 58 wird die Geräuschemission und somit der Lärmpegel gesenkt. Das Schalldämpfungsmaterial 72 in dem Zwischenraum 70 führt zu einer weiteren Reduzierung der Schallabstrahlung und somit zu einer Reduktion des Schallpegels.The geometric deformation of the sleeve 52 on the end wall portion 58, the noise emission and thus the noise level is lowered. The sound damping material 72 in the gap 70 leads to a further reduction of the sound radiation and thus to a reduction of the sound level.

Claims (8)

Elektromagnetisches Schaltventil (30) für ein Kraftstoffeinspritzsystem (10) einer Brennkraftmaschine, aufweisend: - einen Ventilbereich (36) mit einem Schließelement (50) und mit einem Ventilsitz (48), die zum Schließen des Schaltventiles (30) zusammenwirken; und - einen Aktuatorbereich (38) zum Bewegen des Schließelementes (50) entlang einer Bewegungsachse (42) in eine Schließ- oder Öffnungsposition, wobei der Aktuatorbereich (38) zumindest teilweise in einer Hülse (52) aufgenommen ist; wobei die Hülse (52) einen senkrecht zu der Bewegungsachse (42) angeordneten stirnseitigen Wandbereich (58) aufweist,
wobei der stirnseitige Wandbereich (58) wenigstens eine Ausbuchtung (64) aufweist.An electromagnetic switching valve (30) for a fuel injection system (10) of an internal combustion engine, comprising: - A valve region (36) with a closing element (50) and with a valve seat (48), which cooperate to close the switching valve (30); and - An actuator (38) for moving the closing element (50) along a movement axis (42) in a closed or open position, wherein the actuator region (38) is at least partially received in a sleeve (52); wherein the sleeve (52) has an end wall portion (58) arranged perpendicular to the movement axis (42),
wherein the end wall portion (58) has at least one bulge (64). Elektromagnetisches Schaltventil (30) nach Anspruch 1,
dadurch gekennzeichnet, dass die Ausbuchtung (64) als konvexe Ausbuchtung (64) oder als konkave Ausbuchtung (64) ausgebildet ist, wobei die Ausbuchtung (64) insbesondere eine Kugelkalottenform aufweist.Electromagnetic switching valve (30) according to claim 1,
characterized in that the bulge (64) as a convex bulge (64) or as a concave bulge (64) is formed, wherein the bulge (64) in particular has a spherical cap shape. Elektromagnetisches Schaltventil (30) nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, dass die Ausbuchtung (64) symmetrisch um eine Mittellängsachse (66) der Hülse (52) ausgebildet ist, wobei die Ausbuchtung (64) an dem stirnseitigen Wandbereich (58) insbesondere zentral an der Mittellängsachse (66) angeordnet ist.Electromagnetic switching valve (30) according to one of claims 1 or 2,
characterized in that the bulge (64) symmetrically about a central longitudinal axis (66) of the sleeve (52) is formed, wherein the bulge (64) on the end wall portion (58) in particular centrally on the central longitudinal axis (66) is arranged. Elektromagnetisches Schaltventil (30) nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der stirnseitige Wandbereich (58) benachbart zu der Ausbuchtung (64) einen flachen, senkrecht zu der Bewegungsachse (42) angeordneten Plateaubereich (68) aufweist.Electromagnetic switching valve (30) according to one of claims 1 to 3,
characterized in that the end wall portion (58) adjacent to the bulge (64) has a flat, perpendicular to the axis of movement (42) arranged Plateaubereich (68). Elektromagnetisches Schaltventil (30) nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass der Aktuatorbereich (38) ein feststehendes Polstück (40) und einen entlang der Bewegungsachse (42) beweglichen Anker (44) aufweist, die gemeinsam in der Hülse (52) aufgenommen sind, wobei eines der beiden, Polstück (40) oder Anker (44), direkt benachbart zu dem stirnseitigen Wandbereich (58) angeordnet ist, wobei zwischen dem stirnseitigen Wandbereich (58) und dem direkt dazu benachbart angeordneten Element, Polstück (40) oder Anker (44), ein Zwischenraum (70) ausgebildet ist, um das Element Polstück (40) oder Anker (44) zu dem stirnseitigen Wandbereich (58) zu beabstanden.Electromagnetic switching valve (30) according to one of claims 1 to 4,
characterized in that the actuator portion (38) includes a fixed pole piece (40) and an armature (44) movable along the axis of travel (42) received together in the sleeve (52), one of the two pole pieces (40). or armature (44), directly adjacent to the end wall portion (58) is arranged, wherein formed between the front wall portion (58) and the directly adjacent element, pole piece (40) or armature (44), a gap (70) is to space the pole piece (40) or armature (44) to the front wall portion (58). Elektromagnetisches Schaltventil (30) nach Anspruch 5,
dadurch gekennzeichnet, dass der Zwischenraum (70) mit einem Schalldämpfungsmaterial (72) gefüllt ist.Electromagnetic switching valve (30) according to claim 5,
characterized in that the intermediate space (70) is filled with a sound damping material (72). Elektromagnetisches Schaltventil (30) nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass der Aktuatorbereich (38) eine Spule (46) aufweist, die um die Hülse (52) herum an einem sich parallel zu der Bewegungsachse (42) erstreckenden Wandbereich (54) der Hülse (52) angeordnet ist.Electromagnetic switching valve (30) according to one of claims 1 to 6,
characterized in that the actuator region (38) comprises a coil (46) which is arranged around the sleeve (52) on a parallel to the movement axis (42) extending wall portion (54) of the sleeve (52). Kraftstoffhochdruckpumpe (18) für ein Kraftstoffeinspritzsystem (10) einer Brennkraftmaschine, aufweisend ein elektromagnetisches Schaltventil (30) nach einem der Ansprüche 1 bis 7,
wobei ein Ventilbereich (36) des elektromagnetischen Schaltventils (30) in einer Gehäusebohrung (32) der Kraftstoffhochdruckpumpe (18) angeordnet ist, wobei eine Hülse (52), die einen Aktuatorbereich (38) des elektromagnetischen Schaltventils (30) zumindest teilweise aufnimmt, in der Gehäusebohrung (32) befestigt ist und einen stirnseitigen Wandbereich (58) aufweist, der in eine Umgebung (60) der Kraftstoffhochdruckpumpe (18) hervorsteht.High-pressure fuel pump (18) for a fuel injection system (10) of an internal combustion engine, comprising an electromagnetic switching valve (30) according to one of claims 1 to 7,
wherein a valve portion (36) of the electromagnetic switching valve (30) in a housing bore (32) of the high-pressure fuel pump (18) is arranged, wherein a sleeve (52) which at least partially receives an actuator portion (38) of the electromagnetic switching valve (30) in the housing bore (32) is fixed and has an end wall portion (58) which projects into an environment (60) of the high-pressure fuel pump (18).
EP17150804.7A 2017-01-10 2017-01-10 Electromagnetic switching valve and high-pressure fuel pump for a fuel injection system of a combustion engine Active EP3346123B1 (en)

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EP17150804.7A EP3346123B1 (en) 2017-01-10 2017-01-10 Electromagnetic switching valve and high-pressure fuel pump for a fuel injection system of a combustion engine

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EP17150804.7A EP3346123B1 (en) 2017-01-10 2017-01-10 Electromagnetic switching valve and high-pressure fuel pump for a fuel injection system of a combustion engine

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EP3346123A1 true EP3346123A1 (en) 2018-07-11
EP3346123B1 EP3346123B1 (en) 2019-07-10

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219428A1 (en) * 2013-09-26 2015-03-26 Continental Automotive Gmbh Damper for a high-pressure pump
WO2015055410A1 (en) * 2013-10-15 2015-04-23 Continental Automotive Gmbh Valve arrangement
WO2016131644A1 (en) * 2015-02-18 2016-08-25 Delphi International Operations Luxembourg S.À R.L. Actuator assembly of a digital inlet valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219428A1 (en) * 2013-09-26 2015-03-26 Continental Automotive Gmbh Damper for a high-pressure pump
WO2015055410A1 (en) * 2013-10-15 2015-04-23 Continental Automotive Gmbh Valve arrangement
WO2016131644A1 (en) * 2015-02-18 2016-08-25 Delphi International Operations Luxembourg S.À R.L. Actuator assembly of a digital inlet valve

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