EP1043497B1 - Control valve - Google Patents
Control valve Download PDFInfo
- Publication number
- EP1043497B1 EP1043497B1 EP00107266A EP00107266A EP1043497B1 EP 1043497 B1 EP1043497 B1 EP 1043497B1 EP 00107266 A EP00107266 A EP 00107266A EP 00107266 A EP00107266 A EP 00107266A EP 1043497 B1 EP1043497 B1 EP 1043497B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve plate
- flow channel
- control valve
- mouth
- 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.)
- Expired - Lifetime
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Classifications
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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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
- 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
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S239/00—Fluid sprinkling, spraying, and diffusing
- Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
Definitions
- the invention relates to a switching valve according to the preamble of claim 1.
- Such a switching valve is known and is used in particular for actuation of valves, such as injection valves in internal combustion engines, used.
- the switching valve has one Flow channel on, one end of which with a pressure chamber of the actuating valve can be connected.
- the other end of the flow channel opens into a work space provided on the switching valve, in which a valve plate for closing the flow channel is arranged.
- the valve plate can be between a closed position and a release position can be moved back and forth.
- opening the Flow channel can be the pressure chamber of the valve to be actuated, for example connected to a discharge line or to the environment become.
- the known switching valve is used in an injection valve in a diesel engine used the injection timing and the injection duration of the to determine the fuel to be injected through the injection valve can.
- To close the injector of the injector is one provided in a needle guide slidably mounted nozzle needle between the injector and the pressure chamber with which the flow channel of the switching valve is connected, hydraulically clamped is that the nozzle needle keeps the injector closed. By opening the flow channel, this relaxes in the pressure chamber located fluid, so that the nozzle needle releases the injection nozzle. To the closing of the flow channel builds up inside the pressure chamber pressure again through which the nozzle needle returns to its die Injector closing position is moved.
- a switching valve of the type mentioned in the opening paragraph is in EP-A-0 851 115 described.
- the closing element is located completely within the through hole of the radially protruding Federal.
- the valve plate is dimensioned so that it does not radially extends beyond this through opening.
- valve body is designed such that the valve plate in its Closed position on the protruding from the through opening Closing element is present, which closes the mouth of the flow channel, being simultaneously between the radially through the through opening extending valve plate and the valve body a gap remains.
- the mouth of the flow channel closed by the separate closing element which between the valve plate and the mouth of the flow channel is. If the valve plate is moved to the release position, this is because Closing element without pretension at the mouth of the flow channel so that the fluid past the closing element from or into the flow channel can flow.
- the valve plate is returned to its closed position moves, she takes the closing element, which in turn turns on aligns the mouth of the flow channel and closes it as soon as the valve plate has reached its final closed position.
- the closing element can move relative to the valve plate is an exact one Guiding and positioning of the valve plate relative to the mouth of the Flow channel no longer required, so that both the valve plate as well as the guide for the valve plate can be made less precisely must than with the known switching valves.
- the Freedom of movement of the closing element relative to the mouth of the flow channel achieved that the closing element by the inflowing or flowing fluid is moved to a position in which it is even rests against the mouth and seals it properly as soon as it is pressed against the mouth by the valve plate and closes it.
- Valve plate in its closed position on the out of the through opening protruding closing element sealingly abuts when it muzzle closes the flow channel without, however, resting on the valve body, so that there is a gap between the valve plate and the valve body remains, it is ensured that the total closing force the valve plate is only transferred to the closing element, whereby a particularly good sealing effect can be achieved.
- the fluid from the Gap between the valve plate and the valve body are promoted, which slows down the closing movement of the valve plate and any oscillating movements of the valve plate that occur after the impact on the closing element by springing back of the valve plate arise, be dampened.
- valve ball As the closing element, due to their spherical shape in any position relative to the mouth of the flow channel at the mouth is linear.
- the valve plate preferably has a Recess for the closing element on the mouth of the flow channel is aligned.
- the recess and the mouth Form the recess and / or the mouth conically.
- the depth of the The mouth is larger than the stroke of the valve plate. So that the closing element, for example a bullet held in the mouth. simultaneously the closing element in the mouth can be parallel to the valve plate move so that it can center in the mouth.
- the closing element evenly on the wall of the recess created and held in a defined position.
- a conical recess and one with a conical is suitable Sealing surface provided mouth when using a valve ball as Closing element that is special due to its surface curvature well on the inclined walls of the recess and the mouth snugly.
- Switch valves are on the inner surface facing the flow channel of the work space provided resilient elements on the valve plate are attached and guide them, so that a displacement of the valve plate is prevented transversely to their direction of movement.
- the valve plate is preferably in its closed position by a compression spring held and with the help of an actuator in their release position moves, since it is ensured that the switching valve in the event of a failure of the Actuator remains closed.
- the switching valve according to the invention is the working area by a one or multi-part valve body, a ring adjacent to the valve body and an adjacent ring Disc limited.
- the figure shows a switching valve 10 in a sectional side view.
- the switching valve 10 is on a holding body 12 of an injection valve 14 arranged.
- In the holding body 12 is a extending in the longitudinal direction Through hole 16 formed on the in the figure End face of the holding body 12 shown above ends.
- a piston 18 is inserted along the through bore 16 can be moved back and forth and with one end (not shown) on the end face of a nozzle needle (not shown) with which the injection nozzle (not shown) of the injection valve 14 can be locked.
- the switching valve 10 has a cylindrical valve body 20 which is inserted into the through hole 16 of the holding body 12.
- the inner circumference of the through bore 16 and that of the valve body 20 facing end of the piston 18 form a high pressure chamber 22, the purpose of which will be explained later.
- the high pressure chamber 22 is under high pressure fuel filled along the nozzle needle and the piston 18 through the through hole 16 into the cavity 22 has arrived.
- valve body 20 In the valve body 20 is an extending in the longitudinal direction Flow channel 24 formed, which with the high pressure chamber 22 in connection stands and in one on the injection valve 14 facing away from the end face of the valve body 20 shown above conical sealing surface 26 ends.
- a collar 28 On the top face of the valve body 20 is a collar 28 is formed, which protrudes in the radial direction and in the middle of which is arranged concentrically to the conical sealing surface 26 Through opening 30 is formed.
- the injector 14 the flat side of the collar 28 facing away lies in turn on a ring 32, which is also arranged concentrically to the conical sealing surface 26.
- the ring 32 is covered by a circular disk 34, the one has through opening 36 in its center.
- At the injector 14 facing away from the flat side of the second disc 34 are one annular magnet coil 38 and a hollow cylindrical housing 40 provided, both of which are arranged concentrically around the opening 36.
- the collar 28, the ring 32 and the disc 34 delimit a working space 42, in which a circular valve plate 44 is received whose valve body 20 facing front one to the conical Sealing surface 26 aligned recess 46 is formed has a frustoconical cross-sectional shape. Furthermore are with connected to the rear of the valve plate 44 a plurality of resilient elements 48, which protrude downward from the disk 34 and the valve plate 44 hold in a defined position concentric to the conical sealing surface 26. Between the recess 46 of the valve plate 44 and the conical Sealing surface 26 is arranged a valve ball 50 with which the flow channel 24 can be closed.
- the valve plate 44 is driven by the force F of a compression spring (not shown) held in a closed position in which it is under tension the valve ball 50 abuts and against the conical sealing surface 26 presses so that the flow channel 24 is closed in a fluid-tight manner.
- a compression spring (not shown) held in a closed position in which it is under tension the valve ball 50 abuts and against the conical sealing surface 26 presses so that the flow channel 24 is closed in a fluid-tight manner.
- To the To open flow channel 24 can be made of a ferromagnetic Material manufactured valve plate 44 using the solenoid 38 against the Force of the compression spring and the resilient elements 48 into a release position in which the valve plate 44 and the valve ball 50 are lifted off the valve body 20.
- the maximum stroke of the valve plate 44 by the height of the ring 32 in the direction of movement of the valve plate 44 is specified, is dimensioned so that the Valve ball 50 between the recess 46 and the conical sealing surface 26 can move freely, a jumping out of the valve ball 50 from the Recess 46 and the conical sealing surface 26 is prevented.
- valve plate 44 As long as the valve plate 44 is in its closed position, the Flow channel 24 through the pre-stressed on the conical Sealing surface 26 adjacent valve ball 50 closed. This prevents that the fuel in the high-pressure chamber 22 is about the switching valve 10 can escape, so that the piston 18 in its lowered Position persists. In this position, the piston 18 holds the nozzle needle in a position in which it closes the injection nozzle, whereby the nozzle needle due to the pressure applied to the injection nozzle of the fuel supplied to the injection valve 14 against the piston 18 is biased, that is, hydraulically between the high pressure chamber 22 and the injector is clamped.
- the solenoid 38 moves the ferromagnetic valve plate 44 against the force of the compression spring in their release position, whereby the valve ball 50 is released becomes. Due to the pressure acting in the high pressure chamber 22, the valve ball 50 lifted off so that the flow channel 24 is no longer closed is and the fuel in the high-pressure chamber 22 through the flow channel 24 flows into the working space 42, from which it escapes into a leak fuel line via the opening 36 in the disk 34. Due to the falling pressure in the high pressure chamber 22, the from the force exerted on the piston 18 on the nozzle needle is so small that the nozzle needle due to the fuel under high pressure at the injection nozzle is raised and the piston 18 in the direction of the switching valve 10 moves. At the same time, the nozzle needle opens the injection nozzle, so that the fuel enters the cylinder of the engine.
- valve plate 44 As soon as the injection control deactivates the magnet coil 38, the Valve plate 44 by the force of the compression spring and the resilient elements 48 moved back to its closed position, in which the valve ball 50 presses against the conical sealing surface 26, which the flow channel 24th closes again.
- the movement of the valve plate 44 is characterized by the the gap between the valve plate 44 and the collar 28 of the valve body 20 fuel to be displaced damped the closing movement the valve plate 44 slows down, causing the valve plate to spring back 44 effectively prevented after impacting the valve ball 50 becomes.
Description
Die Erfindung betrifft ein Schaltventil gemäβ dem Oberbegriff des Anspruchs 1.The invention relates to a switching valve according to the preamble of claim 1.
Ein derartiges Schaltventil ist bekannt und wird insbesondere zum Betätigen von Ventilen, wie beispielsweise Einspritzventilen in Verbrennungskraftmaschinen, verwendet. Zu diesem Zweck weist das Schaltventil einen Strömungskanal auf, dessen eines Ende mit einem Druckraum des zu betätigenden Ventils verbunden werden kann. Das andere Ende des Strömungskanales mündet in einen am Schaltventil vorgesehenen Arbeitsraum, in dem eine Ventilplatte zum Verschließen des Strömungskanals angeordnet ist. Die Ventilplatte kann zwischen einer Schließstellung und einer Freigabestellung hin und her bewegt werden. Durch Öffnen des Strömungskanales kann der Druckraum des zu betätigenden Ventils beispielsweise mit einer Abströmleitung oder mit der Umgebung verbunden werden. Such a switching valve is known and is used in particular for actuation of valves, such as injection valves in internal combustion engines, used. For this purpose, the switching valve has one Flow channel on, one end of which with a pressure chamber of the actuating valve can be connected. The other end of the flow channel opens into a work space provided on the switching valve, in which a valve plate for closing the flow channel is arranged. The valve plate can be between a closed position and a release position can be moved back and forth. By opening the Flow channel can be the pressure chamber of the valve to be actuated, for example connected to a discharge line or to the environment become.
Das bekannte Schaltventil wird bei einem Einspritzventil in einem Dieselmotor verwendet, um den Einspritzzeitpunkt und die Einspritzdauer des durch das Einspritzventil einzuspritzenden Kraftstoffes bestimmen zu können. Zum Verschließen der Einspritzdüse des Einspritzventils ist eine in einer Nadelführung verschieblich gelagerte Düsennadel vorgesehen, die zwischen der Einspritzdüse und dem Druckraum, mit dem der Strömungskanal des Schaltventils verbunden ist, derart hydraulisch eingespannt ist, daß die Düsennadel die Einspritzdüse verschlossen hält. Durch Öffnen des Strömungskanales entspannt sich das im Druckraum befindliche Fluid, so daß die Düsennadel die Einspritzdüse freigibt. Nach dem Schließen des Strömungskanales baut sich im Inneren des Druckraumes erneut Druck auf, durch den die Düsennadel wieder in ihre die Einspritzdüse verschließende Stellung bewegt wird.The known switching valve is used in an injection valve in a diesel engine used the injection timing and the injection duration of the to determine the fuel to be injected through the injection valve can. To close the injector of the injector is one provided in a needle guide slidably mounted nozzle needle between the injector and the pressure chamber with which the flow channel of the switching valve is connected, hydraulically clamped is that the nozzle needle keeps the injector closed. By opening the flow channel, this relaxes in the pressure chamber located fluid, so that the nozzle needle releases the injection nozzle. To the closing of the flow channel builds up inside the pressure chamber pressure again through which the nozzle needle returns to its die Injector closing position is moved.
Ein Schaltventil der eingangs genannten Art ist in der EP-A-0 851 115 beschrieben. Bei diesem bekannten Schaltventil liegt das Schließelement vollständig innerhalb der Durchgangsöffnung des radial abstehenden Bundes. Zudem ist die Ventilplatte so bemessen, dass sie sich radial nicht über diese Durchgangsöffnung hinaus erstreckt.A switching valve of the type mentioned in the opening paragraph is in EP-A-0 851 115 described. In this known switching valve, the closing element is located completely within the through hole of the radially protruding Federal. In addition, the valve plate is dimensioned so that it does not radially extends beyond this through opening.
Es ist Aufgabe der Erfindung, ein Schaltventil bzw. ein Einspritzventil mit einem derartigen Schaltventil anzugeben, das bzw. bei dem das Schaltventil einfach herzustellen ist und den Strömungskanal mit einfachen Mitteln ordnungsgemäß abdichtet.It is an object of the invention to have a switching valve or an injection valve to specify such a switching valve, or the switching valve is easy to manufacture and the flow channel with simple Seals properly.
Diese Aufgabe wird bei einem Schaltventil der eingangs genannten Art dadurch gelöst, daß dass der Ventilkörper derart gestaltet ist, dass die Ventilplatte in ihrer Schließstellung an dem aus der Durchgangsöffnung hervorstehenden Schließelement anliegt, das die Mündung des Strömungskanals verschließt, wobei gleichzeitig zwischen der sich radial über die Durchgangsöffnung hinaus erstreckenden Ventilplatte und dem Ventilkörper ein Spalt bestehen bleibt.This object is achieved in a switching valve of the type mentioned solved that that the valve body is designed such that the valve plate in its Closed position on the protruding from the through opening Closing element is present, which closes the mouth of the flow channel, being simultaneously between the radially through the through opening extending valve plate and the valve body a gap remains.
Bei dem erfindungsgemäßen Schaltventil wird die Mündung des Strömungskanales durch das separate Schließelement verschlossen, das zwischen der Ventilplatte und der Mündung des Strömungskanales angeordnet ist. Wird die Ventilplatte in die Freigabestellung bewegt, liegt das Schließelement ohne Vorspannung an der Mündung des Strömungskanales an, so daß das Fluid am Schließelement vorbei aus bzw. in den Strömungskanal strömen kann. Wird die Ventilplatte wieder in ihre Schließstellung bewegt, nimmt sie das Schließelement mit, das sich seinerseits an der Mündung des Strömungskanales ausrichtet und diese verschließt, sobald die Ventilplatte in ihrer endgültigen Schließstellung angelangt ist. Da sich das Schließelement relativ zur Ventilplatte bewegen kann, ist eine exakte Führung und Positionierung der Ventilplatte relativ zur Mündung des Strömungskanales nicht mehr erforderlich, so daß sowohl die Ventilplatte als auch die Führung für die Ventilplatte weniger genau gefertigt sein müssen als bei den bekannten Schaltventilen. Gleichzeitig wird durch die Bewegungsfreiheit des Schließelementes relativ zur Mündung des Strömungskanales erreicht, daß das Schließelement durch das einströmende bzw. ausströmende Fluid in eine Position bewegt wird, in der es gleichmäßig an der Mündung anliegt und diese ordnungsgemäß abdichtet, sobald es von der Ventilplatte gegen die Mündung gedrückt wird und diese verschließt.In the switching valve according to the invention, the mouth of the flow channel closed by the separate closing element, which between the valve plate and the mouth of the flow channel is. If the valve plate is moved to the release position, this is because Closing element without pretension at the mouth of the flow channel so that the fluid past the closing element from or into the flow channel can flow. The valve plate is returned to its closed position moves, she takes the closing element, which in turn turns on aligns the mouth of the flow channel and closes it as soon as the valve plate has reached its final closed position. There the closing element can move relative to the valve plate is an exact one Guiding and positioning of the valve plate relative to the mouth of the Flow channel no longer required, so that both the valve plate as well as the guide for the valve plate can be made less precisely must than with the known switching valves. At the same time, the Freedom of movement of the closing element relative to the mouth of the flow channel achieved that the closing element by the inflowing or flowing fluid is moved to a position in which it is even rests against the mouth and seals it properly as soon as it is pressed against the mouth by the valve plate and closes it.
Indem die Geometrie des Ventilkörpers so bernessen, ist daß die Ventilplatte in ihrer Schließstellung an dem aus der Durchgangsöffnung hervorstehenden Schließelement dichtend anliegt, wenn es die Mündung des Strömungskanals verschließt, ohne jedoch am Ventilkörper anzuliegen, so daß zwischen der Ventilplatte und dem Ventilkörper ein Spalt bestehen bleibt, wird sichergestellt, daß die gesamte Schließkraft der Ventilplatte ausschließlich auf das Schließelement übertragen wird, wodurch eine besonders gute Dichtwirkung erzielt werden kann. Darüber hinaus muß bei der Schließbewegung der Ventilplatte das Fluid aus dem Spalt zwischen der Ventilplatte und dem Ventilkörper gefördert werden, wodurch die Schließbewegung der Ventilplatte leicht abgebremst wird und eventuell auftretende Schwingungsbewegungen der Ventilplatte, die nach dem Aufprall auf das Schließelement durch ein Zurückfedern der Ventilplatte entstehen, gedämpft werden.By biting the geometry of the valve body so much is that Valve plate in its closed position on the out of the through opening protruding closing element sealingly abuts when it muzzle closes the flow channel without, however, resting on the valve body, so that there is a gap between the valve plate and the valve body remains, it is ensured that the total closing force the valve plate is only transferred to the closing element, whereby a particularly good sealing effect can be achieved. About that in addition, the fluid from the Gap between the valve plate and the valve body are promoted, which slows down the closing movement of the valve plate and any oscillating movements of the valve plate that occur after the impact on the closing element by springing back of the valve plate arise, be dampened.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus der Beschreibung, der Zeichnung sowie den Unteransprüchen.Advantageous developments of the invention result from the description, the drawing and the subclaims.
So ist besonders vorteilhaft, als Schließelement eine Ventilkugel zu verwenden, die sich durch ihre Kugelform in jeder Lage relativ zur Mündung des Strömungskanales an der Mündung linienförmig anlegt.It is particularly advantageous to use a valve ball as the closing element, due to their spherical shape in any position relative to the mouth of the flow channel at the mouth is linear.
Damit das Schließelement, auch wenn die Ventilplatte in ihre Freigabestellung bewegt ist, in einer definierten Lage relativ zur Mündung des Strömungskanales gehalten ist, weist die Ventilplatte vorzugsweise eine Ausnehmung für das Schließelement auf, die zur Mündung des Strömungskanales ausgerichtet ist. Um das Schließelement besser in der Ausnehmung und der Mündung zu halten, wird ferner vorgeschlagen, die Ausnehmung und/oder die Mündung konisch auszubilden. Die Tiefe der Mündung ist größer als der Hub der Ventilplatte. Damit wird das Schließelement, zum Beispiel eine Kugel, in der Mündung gehalten. Gleichzeitig kann sich das Schließelement in der Mündung parallel zur Ventilplatte bewegen, so daß sie sich in der Mündung zentrieren kann. Durch die konische Querschnittsform der Ausnehmung bzw. der Mündung wird erreicht, daß sich das Schließelement gleichmäßig an die Wand der Ausnehmung anlegt und in einer definierten Lage gehalten wird. Insbesondere eignet sich eine konische Ausnehmung und eine mit einer konischen Dichtfläche versehene Mündung bei der Verwendung einer Ventilkugel als Schließelement, die sich aufgrund ihrer Oberflächenkrümmung besonders gut an die geneigt verlaufenden Wände der Ausnehmung und der Mündung anschmiegt.So that the closing element, even when the valve plate is in its release position is moved, in a defined position relative to the mouth of the Is held flow channel, the valve plate preferably has a Recess for the closing element on the mouth of the flow channel is aligned. To make the closing element better in the It is also proposed to keep the recess and the mouth Form the recess and / or the mouth conically. The depth of the The mouth is larger than the stroke of the valve plate. So that the closing element, for example a bullet held in the mouth. simultaneously the closing element in the mouth can be parallel to the valve plate move so that it can center in the mouth. Through the conical Cross-sectional shape of the recess or mouth is achieved that the closing element evenly on the wall of the recess created and held in a defined position. In particular a conical recess and one with a conical is suitable Sealing surface provided mouth when using a valve ball as Closing element that is special due to its surface curvature well on the inclined walls of the recess and the mouth snugly.
Bei einer besonders bevorzugten Ausführungsform des erfindungsgemäßen Schaltventils sind an der dem Strömungskanal zugewandten Innenfläche des Arbeitsraumes federnde Elemente vorgesehen, die an der Ventilplatte befestigt sind und diese führen, so daß eine Verlagerung der Ventilplatte quer zu ihrer Bewegungsrichtung verhindert ist. Durch die federnden Elemente wird die Ventilplatte in einer definierten Lage gehalten, ohne daß die Ventilplatte exakt geführt sein muß.In a particularly preferred embodiment of the invention Switch valves are on the inner surface facing the flow channel of the work space provided resilient elements on the valve plate are attached and guide them, so that a displacement of the valve plate is prevented transversely to their direction of movement. By the resilient Elements, the valve plate is held in a defined position, without the valve plate having to be guided exactly.
Die Ventilplatte wird vorzugsweise durch eine Druckfeder in ihrer Schließstellung gehalten und mit Hilfe eines Aktuators in ihre Freigabestellung bewegt, da so sichergestellt ist, daß das Schaltventil bei einem Ausfall des Aktuators geschlossen bleibt.The valve plate is preferably in its closed position by a compression spring held and with the help of an actuator in their release position moves, since it is ensured that the switching valve in the event of a failure of the Actuator remains closed.
Bei einer bevorzugten Ausführungsform des erfindungsgemäßen Schaltventils ist der Arbeitsraum durch einen ein- oder mehrteiligen Ventilkörper, einen am Ventilkörper anliegenden Ring und eine an diesem anliegende Scheibe begrenzt. Durch die Wahl der Materialstärke der Scheibe kann bei Verwendung eines Magneten als Aktuator die Haltekraft des Magneten beeinflußt werden, wenn dieser an der der Ventilplatte abgewandten Fläche der Scheibe angeordnet ist, da die Materialstärke der Scheibe den Abstand bzw. den Luftspalt der Ventilscheibe zum Magneten bestimmt. In a preferred embodiment of the switching valve according to the invention is the working area by a one or multi-part valve body, a ring adjacent to the valve body and an adjacent ring Disc limited. By choosing the material thickness of the pane can use the holding force of the magnet when using a magnet as an actuator be influenced if this on the side facing away from the valve plate Surface of the disc is arranged because of the material thickness of the disc determines the distance or the air gap of the valve disc to the magnet.
Das zuvor beschriebene Schaltventil kann insbesondere bei einem Einspritzventil zur Kraftstoffeinspritzung in einer Verbrennungskraftmaschine verwendet werden. Dabei steht der Strömungskanal mit einer Nadelführung in Verbindung, in der eine Düsennadel zum Verschließen der Einspritzdüse des Einspritzventils verschieblich aufgenommen ist. Nachfolgend wird die Erfindung anhand eines Ausführungsbeispieles unter Bezugnahme auf die Zeichnung näher erläutert. Es zeigt die einzige
- Figur
- eine geschnittene Seitenansicht eines erfindungsgemäßen Schaltventils zum Betätigen eines Einspritzventils.
- figure
- a sectional side view of a switching valve according to the invention for actuating an injection valve.
Die Figur zeigt ein Schaltventil 10 in einer geschnittenen Seitenansicht.
Das Schaltventil 10 ist an einem Haltekörper 12 eines Einspritzventils 14
angeordnet. Im Haltekörper 12 ist eine sich in dessen Längsrichtung erstreckende
Durchgangsbohrung 16 ausgebildet, die an der in der Figur
oben gezeigten Stirnseite des Haltekörpers 12 endet. In die Durchgangsbohrung
16 ist ein Kolben 18 eingeführt, der längs der Durchgangsbohrung
16 hin und her bewegt werden kann und mit seiner einen Stirnseite
(nicht dargestellt) an der Stirnseite einer Düsennadel (nicht dargestellt)
anliegt, mit der die Einspritzdüse (nicht dargestellt) des Einspritzventils 14
verschlossen werden kann.The figure shows a
Das Schaltventil 10 weist einen zylinderförmigen Ventilkörper 20 auf, der
in die Durchgangsbohrung 16 des Haltekörpers 12 eingeführt ist. Die in
die Durchgangsbohrung 16 zeigende Stirnseite des Ventilkörpers 20, der
Innenumfang der Durchgangsbohrung 16 sowie die dem Ventilkörper 20
zugewandte Stirnseite des Kolbens 18 bilden einen Hochdruckraum 22,
dessen Zweck später erläutert wird. Der Hochdruckraum 22 ist mit unter
hohem Druck stehenden Kraftstoff gefüllt, der entlang der Düsennadel
und des Kolbens 18 durch die Durchgangsbohrung 16 in den Hohlraum
22 gelangt ist.The
Im Ventilkörper 20 ist ein sich in dessen Längsrichtung erstreckender
Strömungskanal 24 ausgebildet, der mit dem Hochdruckraum 22 in Verbindung
steht und in einer an der dem Einspritzventil 14 abgewandten, in
der Figur oben dargestellten Stirnseite des Ventilkörpers 20 ausgebildeten
konischen Dichtfläche 26 endet. An der oberen Stirnseite des Ventilkörpers
20 ist ein Bund 28 angeformt, der in radialer Richtung absteht und
in dessen Mitte eine konzentrisch zur konischen Dichtfläche 26 angeordnete
Durchgangsöffnung 30 ausgebildet ist. Die dem Einspritzventil 14
abgewandte Flachseite des Bundes 28 liegt ihrerseits an einem Ring 32,
der gleichfalls konzentrisch zur konischen Dichtfläche 26 angeordnet ist.
Der Ring 32 ist von einer kreisflächenförmigen Scheibe 34 bedeckt, die eine
durchgängige Öffnung 36 in ihrer Mitte aufweist. An der dem Einspritzventil
14 abgewandten Flachseite der zweiten Scheibe 34 sind eine
ringförmige Magnetspule 38 sowie ein hohlzylinderförmiges Gehäuse 40
vorgesehen, die beide konzentrisch um die Öffnung 36 angeordnet sind.In the
Der Bund 28, der Ring 32 und die Scheibe 34 begrenzen einen Arbeitsraum
42, in dem eine kreisförmige Ventilplatte 44 aufgenommen ist, an
deren dem Ventilkörpers 20 zugewandten Vorderseite eine zu der konischen
Dichtfläche 26 ausgerichtete Ausnehmung 46 ausgebildet ist, die
eine kegelstumpfförmige Querschnittsform aufweist. Des weiteren sind mit
der Rückseite der Ventilplatte 44 mehrere federnde Elemente 48 verbunden,
die von der Scheibe 34 nach unten abstehen und die Ventilplatte 44
in einer definierten Lage konzentrisch zur konischen Dichtfläche 26 halten.
Zwischen der Ausnehmung 46 der Ventilplatte 44 und der konischen
Dichtfläche 26 ist eine Ventilkugel 50 angeordnet, mit der der Strömungskanal
24 verschlossen werden kann.The
Die Ventilplatte 44 wird durch die Kraft F einer Druckfeder (nicht dargestellt)
in einer Schließstellung gehalten, in der sie unter Vorspannung an
der Ventilkugel 50 anliegt und diese gegen die konische Dichtfläche 26
drückt, damit der Strömungskanal 24 fluiddicht verschlossen ist. Um den
Strömungskanal 24 zu öffnen, kann die aus einem ferromagnetischen
Werkstoff gefertigte Ventilplatte 44 mit Hilfe der Magnetspule 38 gegen die
Kraft der Druckfeder und der federnden Elemente 48 in eine Freigabestellung
bewegt werden, in der die Ventilplatte 44 und die Ventilkugel 50
vom Ventilkörper 20 abgehoben sind. Der maximale Hub der Ventilplatte
44, die durch die Höhe des Ringes 32 in Bewegungsrichtung der Ventilplatte
44 gesehen vorgegeben ist, ist dabei so bemessen, daß sich die
Ventilkugel 50 zwischen der Ausnehmung 46 und der konischen Dichtfläche
26 frei bewegen kann, ein Herausspringen der Ventilkugel 50 aus der
Ausnehmung 46 und der konischen Dichtfläche 26 jedoch verhindert ist.The
Solange sich die Ventilplatte 44 in ihrer Schließstellung befindet, ist der
Strömungskanal 24 durch die unter Vorspannung an der konischen
Dichtfläche 26 anliegende Ventilkugel 50 verschlossen. Dadurch wird verhindert,
daß der sich im Hochdruckraum 22 befindliche Kraftstoff über
das Schaltventil 10 entweichen kann, so daß der Kolben 18 in seiner abgesenkten
Position verharrt. In dieser Stellung hält der Kolben 18 die Düsennadel
in einer Position, in der diese die Einspritzdüse verschließt, wobei
die Düsennadel durch den an der Einspritzdüse anliegenden Druck
des dem Einspritzventil 14 zugeführten Kraftstoffes gegen den Kolben 18
vorgespannt ist, also hydraulisch zwischen der Hochdruckkammer 22 und
der Einspritzdüse eingespannt ist.As long as the
Betätigt nun die Einspritzsteuerung des Motors die Magnetspule 38, bewegt
sich die ferromagnetische Ventilplatte 44 gegen die Kraft der Druckfeder
in ihre Freigabestellung, wodurch die Ventilkugel 50 freigegeben
wird. Durch den im Hochdruckraum 22 wirkenden Druck wird die Ventilkugel
50 abgehoben, so daß der Strömungskanal 24 nicht mehr verschlossen
ist und der im Hochdruckraum 22 befindliche Kraftstoff durch
den Strömungskanal 24 in den Arbeitsraum 42 einströmt, aus dem er
über die Öffnung 36 in der Scheibe 34 in eine Leckkraftstoffleitung entweicht.
Durch den abfallenden Druck im Hochdruckraum 22 wird die von
dem Kolben 18 auf die Düsennadel ausgeübte Kraft so klein, daß die Düsennadel
durch den unter hohem Druck stehenden Kraftstoff an der Einspritzdüse
angehoben wird und den Kolben 18 in Richtung des Schaltventils
10 bewegt. Gleichzeitig öffnet die Düsennadel die Einspritzdüse, so
daß der Kraftstoff in den Zylinder des Motors eintritt.Now actuates the injection control of the engine, the
Sobald die Einspritzsteuerung die Magnetspule 38 deaktiviert, wird die
Ventilplatte 44 durch die Kraft der Druckfeder und der federnden Elemente
48 wieder in ihre Schließstellung bewegt, in der sie die Ventilkugel
50 gegen die konische Dichtfläche 26 drückt, die den Strömungskanal 24
erneut verschließt. Die Bewegung der Ventilplatte 44 wird durch den aus
dem Spalt zwischen der Ventilplatte 44 und dem Bund 28 des Ventilkörpers
20 zu verdrängenden Kraftstoff gedämpft, der die Schließbewegung
der Ventilplatte 44 verlangsamt, wodurch ein Zurückfedern der Ventilplatte
44 nach dem Aufprall auf die Ventilkugel 50 wirksam verhindert
wird. As soon as the injection control deactivates the
- 1010
- Schaltventilswitching valve
- 1212
- Haltekörperholding body
- 1414
- EinspritzventilInjector
- 1616
- DurchgangsbohrungThrough Hole
- 1818
- Kolbenpiston
- 2020
- Ventilkörpervalve body
- 2222
- HochdruckraumHigh-pressure chamber
- 2424
- Strömungskanalflow channel
- 2626
- konische Dichtflächeconical sealing surface
- 2828
- BundFederation
- 3030
- DurchgangsöffnungThrough opening
- 3232
- Ringring
- 3434
- Scheibedisc
- 3636
- Öffnungopening
- 3838
- Magnetspulesolenoid
- 4040
- Gehäusecasing
- 4242
- Arbeitsraumworking space
- 4444
- Ventilplattevalve plate
- 4646
- Ausnehmungrecess
- 4848
- federnde Elementeresilient elements
- 5050
- Ventilkugelvalve ball
Claims (12)
- Control valve, in particular for actuating an injection valve in an internal combustion engine, with a valve body (20) which has a radially projecting collar (28) and in which is formed a flow channel (24) which with one end leads into a work chamber (42), wherein the radially projecting collar (28) is provided with a through-opening (30) oriented concentrically with the mouth (26) of the flow channel (24) of the valve body (20), with a valve plate (44) which is held in the work chamber (42) and is movable between a closed position and a release position, and with a closure element (50) which is arranged between the valve plate (44) and the mouth (26) of the flow channel (24) and which closes the latter when the valve plate (44) is in its closed position, wherein the valve body (20) is designed in such a way that the valve plate (44) in its closed position abuts against the closure element (50) which closes the mouth (26) of the flow channel (24), characterised in that a gap is left between the valve body (20) and the valve plate (44) extending radially beyond the through-opening (30) in its closed position, and in that the closure element (50) in the closed position protrudes from the through-opening (30).
- Control valve according to claim 1, characterised in that the closure element is a valve ball (50).
- Control valve according to claim 1 or 2, characterised in that the valve plate (44) has a recess (46) which is held towards the mouth (26) of the flow channel (50) even when the valve plate (44) is moved into its release position, in the recess (46) and the mouth (26).
- Control valve according to claim 3, characterised in that the recess (46) and/or the mouth (26) of the flow channel (24) is or are conically widened.
- Control valve according to claim 3 or 4, characterised in that the depth of the recess (46) is greater than the stroke of the valve plate (44).
- Control valve according to any of claims 1 to 5, characterised in that on the inner surface of the work chamber (42) facing towards the flow channel (24) are provided spring elements (48) which are attached to the valve plate (44) and mechanically bias it in the direction of the flow channel (24) in such a way that displacement of the valve plate (44) transversely to its direction of movement is prevented.
- Control valve according to any of claims 1 to 6, characterised in that the valve plate (44) is kept by a compression spring in its closed position and is movable by means of an actuator (38) into its release position.
- Control valve according to claim 7, characterised in that an electrically driven magnet (38) serves as the actuator and the valve plate (44) is at least partially formed from a ferromagnetic material.
- Control valve according to any of the preceding claims, characterised by a ring (32) which is supported by one end face on the collar (28) and against whose other end face abuts a disc (34) which together with the collar (28) and the ring (32) defines the work chamber (42) of the control valve (10).
- Control valve according to claim 8 or 9, characterised in that the magnet (38) is arranged on the surface of the disc (34) facing away from the valve plate (44), whose material thickness determines the air gap when the valve plate (44) is moved into its release position.
- Injection valve for fuel injection in an internal combustion engine, in particular in a diesel engine, with a holding body (12) and, attached to the latter, a nozzle body of an injection nozzle with a jet needle for closing the injection nozzle, which is movable in a needle guide (16) which is formed in the holding body (12) and nozzle body and serves as a fuel supply means, and with a control valve (10) according to any of the preceding claims, whose flow channel (24) is connected to the needle guide (16).
- Injection valve according to claim 11, characterised in that the valve body (20) of the control valve (10) closes one end of the section of the needle guide (16) which is formed in the holding body (12), and with the end face of the jet needle extending into the holding body (12) defines a high-pressure chamber (22) which is connected to the flow channel (24).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19915686 | 1999-04-07 | ||
| DE19915686A DE19915686A1 (en) | 1999-04-07 | 1999-04-07 | Switching valve |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1043497A2 EP1043497A2 (en) | 2000-10-11 |
| EP1043497A3 EP1043497A3 (en) | 2003-04-16 |
| EP1043497B1 true EP1043497B1 (en) | 2004-12-01 |
Family
ID=7903784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00107266A Expired - Lifetime EP1043497B1 (en) | 1999-04-07 | 2000-04-03 | Control valve |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6360972B1 (en) |
| EP (1) | EP1043497B1 (en) |
| JP (1) | JP3667592B2 (en) |
| DE (2) | DE19915686A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10161002A1 (en) * | 2001-12-12 | 2003-07-03 | Bosch Gmbh Robert | Solenoid valve for controlling an injection valve of an internal combustion engine |
| US7051992B2 (en) * | 2003-08-25 | 2006-05-30 | Delphi Technologies, Inc. | Tubeless actuator with reduced secondary air gap |
| DE102004015661B4 (en) * | 2004-03-31 | 2007-08-23 | Bosch Rexroth Ag | Electro-pneumatic valve, in particular pilot valve for a pneumatic directional control valve |
| WO2006042488A1 (en) * | 2004-10-21 | 2006-04-27 | Robert Bosch Gmbh | Fuel injector |
| DE102006049050A1 (en) * | 2006-10-18 | 2008-04-30 | Robert Bosch Gmbh | Injector for injecting fuel |
| DE102007056913A1 (en) * | 2007-11-26 | 2009-05-28 | Robert Bosch Gmbh | Injector for fuel with ball valve |
| DE102015218054A1 (en) * | 2015-09-21 | 2017-03-23 | Robert Bosch Gmbh | Valve, in particular suction valve, in a high-pressure pump of a fuel injection system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2597186B1 (en) * | 1986-04-14 | 1990-01-12 | Europ Propulsion | VALVE OR VALVE OPERATING WITHOUT FRICTION |
| IT1240173B (en) * | 1990-04-06 | 1993-11-27 | Weber Srl | ELECTROMAGNETICALLY OPERATED FUEL INJECTION DEVICE FOR AN INTERNAL COMBUSTION ENGINE |
| IT220660Z2 (en) * | 1990-10-31 | 1993-10-08 | Elasis Sistema Ricerca Fiat | IMPROVEMENTS IN THE HIGH PRESSURE SHUTTER SYSTEM IN A PILOT VALVE OF AN ELECTROMAGNETIC INJECTOR FOR FUEL INJECTION SYSTEMS OF INTERNAL COMBUSTION ENGINES |
| DE4235077A1 (en) * | 1992-10-17 | 1994-04-21 | Bosch Gmbh Robert | Valve esp. for hydraulic vehicle brake system - has hollow component contg. pair of relatively movable valve elements and at least one connecting opening |
| US5348233A (en) * | 1993-03-01 | 1994-09-20 | General Motors Corporation | High volume gaseous fuel injector |
| DE4428385B4 (en) * | 1994-08-11 | 2005-03-17 | Robert Bosch Gmbh | valve body |
| JP3524217B2 (en) * | 1995-06-19 | 2004-05-10 | 本田技研工業株式会社 | solenoid valve |
| IT1289795B1 (en) * | 1996-12-23 | 1998-10-16 | Elasis Sistema Ricerca Fiat | IMPROVEMENTS TO AN ELECTROMAGNETICALLY OPERATED DOSING VALVE, WITH BALL SHUTTER, FOR A FUEL INJECTOR. |
| IT1296144B1 (en) * | 1997-11-18 | 1999-06-09 | Elasis Sistema Ricerca Fiat | ADJUSTABLE DOSING VALVE FOR ONE FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINES. |
| DE19832826C2 (en) * | 1998-07-21 | 2000-08-17 | Bosch Gmbh Robert | Assembly procedure for fuel injector and pilot valve and fuel injector |
-
1999
- 1999-04-07 DE DE19915686A patent/DE19915686A1/en not_active Withdrawn
-
2000
- 2000-04-03 EP EP00107266A patent/EP1043497B1/en not_active Expired - Lifetime
- 2000-04-03 DE DE50008794T patent/DE50008794D1/en not_active Expired - Lifetime
- 2000-04-06 US US09/543,914 patent/US6360972B1/en not_active Expired - Lifetime
- 2000-04-07 JP JP2000106678A patent/JP3667592B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19915686A1 (en) | 2000-10-12 |
| EP1043497A3 (en) | 2003-04-16 |
| JP2000310170A (en) | 2000-11-07 |
| EP1043497A2 (en) | 2000-10-11 |
| US6360972B1 (en) | 2002-03-26 |
| JP3667592B2 (en) | 2005-07-06 |
| DE50008794D1 (en) | 2005-01-05 |
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