EP1526271B1 - Exhaust gas recirculation valve - Google Patents
Exhaust gas recirculation valve Download PDFInfo
- Publication number
- EP1526271B1 EP1526271B1 EP03024508A EP03024508A EP1526271B1 EP 1526271 B1 EP1526271 B1 EP 1526271B1 EP 03024508 A EP03024508 A EP 03024508A EP 03024508 A EP03024508 A EP 03024508A EP 1526271 B1 EP1526271 B1 EP 1526271B1
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- EP
- European Patent Office
- Prior art keywords
- valve
- exhaust gas
- drive
- gas recirculation
- drive element
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000033001 locomotion Effects 0.000 description 15
- 230000008901 benefit Effects 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
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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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
Definitions
- the invention relates to an exhaust gas recirculation valve according to the preamble of claim 1.
- the US 4,646,705 describes an exhaust gas recirculation valve in which a disc-shaped valve member is mounted eccentrically on a spindle, so that in addition to a lifting movement, which is required for opening the valve, a forced rotational movement takes place, which is used in such a way that impurities are abraded.
- An exhaust gas recirculation valve according to the preamble of claim 1 is known from EP 1 111 227 A2 known and provides in this case, that a valve element is at least at the beginning of the opening process not only raised, but also rotated. This can also be solved in the context of the opening process impurities and adhesions.
- the invention has for its object to provide an improved exhaust gas recirculation valve, which works reliably even with larger contaminants.
- a drive member is rotatably driven by the rotary drive and constitutes a part of the rotary-stroke conversion mechanism. Further, the drive member which, as mentioned, is rotatably driven by the rotary drive, by the rotary-stroke conversion mechanism as a result of rotation and lifting lowered.
- the drive element raises and lowers a valve member to effect opening and closing of the valve.
- the drive element and a valve element in which e.g. may be a valve lifter with a valve plate mounted thereon, connected such that lifting and lowering of the drive element or generally a translatory movement is transmitted to the valve element.
- the drive element is rotatably connected to the valve element at least in the opening direction.
- This rotatable connection can be direct or indirect be provided.
- the valve element can rotate when opening together with the drive element, but it is not necessarily rotated when opening.
- the drive element is rotatable at least in the opening direction with respect to the (for example as a result of adhesions) stuck valve member. Therefore, the rotation of the driving member is not prevented even when a seizing of the valve element, and by the rotation-stroke conversion mechanism, this rotation is converted into a lifting movement, so that the valve can be opened smoothly. Overall, a trouble-free operation can be guaranteed.
- the exhaust gas recirculation valve according to the invention can be effected by the force acting between the drive element and the valve element friction, with which force should be a rotation of the valve element, and from which threshold a rotation between the drive element and the valve element is to be allowed to block avoid.
- a common collar of the valve element in the region of a shoulder of the drive element can be inserted into this.
- a plate spring may be interposed, which serves, however, the axial fixation. Between the valve element and the drive element, this spring does not act, so that even with the last-described arrangement there is a freely rotatable connection with the exception of the friction.
- This measure ie a completely free rotation between valve element and drive element is provided in particular in the modification in which the drive element is not part of the rotary-hub conversion mechanism.
- Such an embodiment is conceivable despite the preceding embodiments and is considered in particular with a completely freely rotatable connection between the valve and drive element as the subject of the application.
- the inventive, rotatable, direct or indirect connection between the drive element and valve element can also be provided in an exhaust gas recirculation valve having a translational drive, for example, a solenoid, instead of the rotary drive.
- a rotation of the valve element may also be provided. This can be achieved by a rotary-hub conversion mechanism that converts translatory drive motion into at least slight rotation of the valve element. In other words, a drive element is rotated in this case as a result of the translational movement.
- a rotatable connection between the drive element and the valve element can be provided in order not to forcibly provide the rotation for loosening contaminants, but also in the event that a rotation is blocked by adhesions, the valve by the translational movement to be able to open.
- a bearing bush has proved to be advantageous.
- the friction described above can be realized.
- a desired characteristic with regard to the transmission of frictional force can be realized by the choice of suitable fit ratios between said elements and / or suitable materials.
- the drive element in all directions, ie, in the closing direction, with respect to the valve element is rotatable.
- a screw track is preferred in which at least one fixedly mounted and rotatably mounted roller is arranged.
- the drive element in this preferred case, for example, a groove in the form of a comparatively short helix is provided.
- a groove flank is supported on the roller arranged in the groove and, as a result of the rotation of the drive element, causes a translatory movement of the same, which can be used for opening and closing the valve.
- valve element is a valve tappet with a valve disk mounted thereon.
- the valve stem is rotatable, but axially fixedly connected to the drive element in order to realize the advantages described above.
- the valve stem which in this case is part of the rotary-hub conversion mechanism, is firmly connected in all respects with a drive element, and the valve disk with respect to the valve stem is rotatable. This also makes it possible to realize opening of the valve by means of a lifting movement even when the valve disk adheres to its valve seat, which would result in blockage of the valve in the event of a forcibly provided rotation of the valve disk.
- the exhaust gas recirculation valve 10 shown in FIG. 1 initially has a number of housing parts and connections for the existing bearing feedback sensors and the like in its upper region.
- the description may focus on how the actuation occurs due to a rotation of a gear 12.
- any drive such as a torque or DC motor is conceivable.
- a so-called drive element is driven in rotation. In the illustrated example, this is done via said gear 12, which is connected via two driving pins 46, of which only one can be seen in the figure, with the drive element 14, which has substantially the shape of a sleeve.
- a spring 48 is first provided, which is designed as a torsion spring and biases the drive element in the closed state, so that even with a malfunction of the drive reliable closure is possible.
- This spring is a spiral or so-called watchmaker spring, which is deformed at an opening of the valve such that it applies a rotational force in the closing direction.
- To the Outer circumference of the drive member 14 is formed substantially in the form of a groove 16 is a track which constitutes a portion of a helix.
- the roller 18 is fixedly mounted on an axis 20 with respect to the housing 22 and rotatable about the axis 20 in this screwing 16 in the example shown.
- the drive member 14 By the rotation of the drive member 14 and the rolling of the roller 18 in the helical path on the outer periphery of the drive member 14, the drive member 14 is pressed down. By fixed in the axial direction of the valve stem 32 in the drive element this is also pressed down so that the valve plate 26 again comes to the valve seat 28, and the valve is closed.
- the valve element in the case of the valve tappet 32 shown, is rotatably mounted with respect to the drive element 14. This is done in the example shown by means of the bearing bush 36. Starting from the closed State of the valve, as shown in Fig. 1, thus, the drive member 14 may rotate with respect to the possibly stuck due to bonding valve member 32. Since this rotational movement is also made possible with an adhesive valve element, the rotary-stroke conversion mechanism in the form of the screw 16 and roller 18 act and a lifting of the drive element 14 and thus opening of the valve take place. This allows a trouble-free opening and overall trouble-free operation can be realized. It should be added that in a lower region of the valve tappet 32, these dogs can be displaceably mounted in suitable bearing bushes 38 which are arranged in the housing 22. In this case, a seal can also be provided in an advantageous manner.
- the exhaust gas recirculation valve 10 is additionally shown in a perspective view and with other components, such as a rotary motor 40.
- the rotation of the motor is transmitted via different gears 42 to a gear 12, which is arranged somewhat differently than in the embodiment of Fig. 1, and from there to the drive member 14.
- the drive element 14 can be designed in two parts for manufacturing reasons. This is realized, in particular, as shown by way of example, if the bipartition of the drive element 14 also results in a division of the screwing track 16 so that, in other words, it is formed by the combination of the two parts of the drive element.
- a torsion spring 44 it can be ensured by a torsion spring 44 that the valve is biased into a closed position, so that even with a fault in the region of the rotary drive 40, a reliable closing takes place.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Mechanically-Actuated Valves (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Die Erfindung betrifft ein Abgasrückführventil nach dem Oberbegriff des Anspruchs 1.The invention relates to an exhaust gas recirculation valve according to the preamble of claim 1.
Auf dem Gebiet der Kraftfahrzeugtechnik und insbesondere in Zusammenhang mit der Verbesserung der Emissionswerte eines Verbrennungsmotors, sowie der Senkung des Kraftstoffverbrauchs ist es bekannt, eine Abgasrückführung zu der Frischluftzuführung des Verbrennungsmotors vorzusehen.In the field of automotive engineering and in particular in connection with the improvement of the emission values of an internal combustion engine, as well as the reduction of fuel consumption, it is known to provide an exhaust gas recirculation to the fresh air supply of the internal combustion engine.
Aus der
Die
Ein Abgasrückführventil nach dem Oberbegriff des Anspruchs 1 ist aus der
Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Abgasrückführventil zu schaffen, das auch bei umfangreicheren Verunreinigungen zuverlässig funktioniert.The invention has for its object to provide an improved exhaust gas recirculation valve, which works reliably even with larger contaminants.
Die Lösung dieser Aufgabe erfolgt durch das im Anspruch 1 beschriebene Abgasrückführventil.The solution to this problem is achieved by the exhaust gas recirculation valve described in claim 1.
Demzufolge weist dieses einen Drehantrieb und einen Dreh-Hub-Umwandlungsmechanismus auf. Ein Antriebselement ist durch den Drehantrieb drehend antreibbar und stellt einen Teil des Dreh-Hub-Umwandlungsmechanismus dar. Ferner ist das Antriebselement, das, wie erwähnt, durch den Drehantrieb drehend antreibbar ist, durch den Dreh-Hub-Umwandlungsmechanismus infolge einer Drehung anheb- und absenkbar. Im Wesentlichen erfolgt durch das Antriebselement das Anheben und Absenken eines Ventilelements, um die Öffnung und Schließung des Ventils zu bewirken. Zu diesem Zweck sind das Antriebselement und ein Ventilelement, bei dem es sich z.B. um einen Ventilstößel mit einem daran angebrachten Ventilteller handeln kann, derart verbunden, dass ein Anheben und Absenken des Antriebselements oder allgemein eine translatorische Bewegung auf das Ventilelement übertragen wird.Consequently, this has a rotary drive and a rotary-hub conversion mechanism. A drive member is rotatably driven by the rotary drive and constitutes a part of the rotary-stroke conversion mechanism. Further, the drive member which, as mentioned, is rotatably driven by the rotary drive, by the rotary-stroke conversion mechanism as a result of rotation and lifting lowered. Essentially, the drive element raises and lowers a valve member to effect opening and closing of the valve. For this purpose, the drive element and a valve element, in which e.g. may be a valve lifter with a valve plate mounted thereon, connected such that lifting and lowering of the drive element or generally a translatory movement is transmitted to the valve element.
Erfindungsgemäß ist das Antriebselement mit dem Ventilelement jedoch zumindest in Öffnungsrichtung drehbar verbunden. Diese drehbare Verbindung kann mittelbar oder unmittelbar vorgesehen sein. Mit anderen Worten kann sich das Ventilelement beim Öffnen zusammen mit dem Antriebselement drehen, es wird jedoch beim Öffnen nicht zwangsweise mitgedreht. Hierin liegt ein Unterschied und entscheidender Vorteil zu den bislang bekannten Anordnungen, bei denen stets zwangsweise eine Drehung des Ventilelements zusammen mit dessen Hubbewegung erfolgte. Die erfindungsgemäße Maßnahme bietet den Vorteil, dass ein Öffnen des Ventils auch dann möglich ist, wenn eine hartnäckige Verklebung oder Verschmutzung das Ventilelement in seiner (Dreh-)Position hält. Bei den bislang bekannten, eingangs beschriebenen Abgasrückführventilen trat in dieser Situation der Fall auf, dass durch das zwangsweise vorgesehene Verdrehen des Ventilelements ein Blockieren des Ventilelements, des Antriebselements und damit des gesamten Antriebs auftrat, wenn eine Verschmutzung die Verdrehung verhinderte. Mit anderen Worten konnte in einem derartigen Fall das Ventil nicht geöffnet werden, was eine unerwünschte Funktionsstörung darstellt.According to the invention, however, the drive element is rotatably connected to the valve element at least in the opening direction. This rotatable connection can be direct or indirect be provided. In other words, the valve element can rotate when opening together with the drive element, but it is not necessarily rotated when opening. This is a difference and a decisive advantage to the previously known arrangements in which there was always forcibly a rotation of the valve element together with its stroke movement. The measure according to the invention offers the advantage that it is also possible to open the valve when stubborn adhesion or contamination keeps the valve element in its (rotational) position. In the previously known, initially described exhaust gas recirculation valves occurred in this situation, the case that caused by the forced rotation of the valve element blocking the valve element, the drive element and thus the entire drive occurred when pollution prevented the rotation. In other words, in such a case, the valve could not be opened, which is an undesirable malfunction.
Bei dem erfindungsgemäßen Abgasrückführventil ist das Antriebselement zumindest in Öffnungsrichtung bezüglich des (beispielsweise infolge von Verklebungen) festsitzenden Ventilelements drehbar. Deshalb wird die Drehung des Antriebselements auch bei einem Festsitzen des Ventilelements nicht verhindert, und durch den Dreh-Hub-Umwandlungsmechanismus wird diese Drehung in eine Hubbewegung umgewandelt, so dass das Ventil störungsfrei geöffnet werden kann. Insgesamt kann damit ein störungsfreier Betrieb gewährleistet werden. Bei dem erfindungsgemäßen Abgasrückführventil kann durch die zwischen dem Antriebselement und dem Ventilelement wirkende Reibung eine Einstellung dahingehend erfolgen, mit welcher Kraft eine Verdrehung des Ventilelements erfolgen soll, und ab welchem Schwellenwert eine Verdrehung zwischen dem Antriebselement und dem Ventilelement zugelassen werden soll, um ein Blockieren zu vermeiden. Sofern zwischen den genannten Elementen eine gewisse Reibung wirkt, können Verklebungen oder Verschmutzungen, die weniger Kraft aufbringen als die beschriebene Reibung, gelöst werden, indem das Ventilelement mit dem Antriebselement mitgedreht wird, und hierdurch Verklebungen gelöst werden. Sollten sich diese jedoch als stärker erweisen als der Reibschluss zwischen den genannten Elementen, erfolgt eine Drehung des Antriebselements bezüglich des Ventilelements, so dass auch in diesem Fall keine Blockade eintritt, und das Ventil infolge der Drehbewegung des Antriebselements geöffnet werden kann. In diesem Zusammenhang ist auch zu erwähnen, dass das Antriebselement üblicherweise bezüglich des Ventilelements mit Ausnahme der beschriebenen Reibung völlig frei drehbar ist, und hier keine Federn oder ähnliche Elemente zwischengeschaltet sind. Es sei jedoch angemerkt, dass, wie aus den Figuren ersichtlich, ein verbreiteter Bund des Ventilelements im Bereich eines Absatzes des Antriebselements in dieses eingesetzt sein kann. Um das Ventilelement mit seinem verbreiterten Bund zu befestigen, kann zwischen einem Befestigungselement und dem Bund beispielsweise eine Tellerfeder zwischengeschaltet sein, die jedoch der axialen Fixierung dient. Zwischen Ventilelement und Antriebselement wirkt diese Feder nicht, so dass auch bei der zuletzt beschriebenen Anordnung eine mit Ausnahme der Reibung frei drehbare Verbindung vorliegt. Diese Maßnahme, also eine vollständig freie Drehbarkeit zwischen Ventilelement und Antriebselement ist insbesondere bei derjenigen Modifikation vorgesehen, bei der das Antriebselement nicht einen Teil des Dreh-Hub-Umwandlungsmechanismus darstellt. Eine derartige Ausführungsform ist trotz der vorangehenden Ausführungen denkbar und wird insbesondere mit einer vollständig frei drehbaren Verbindung zwischen Ventil- und Antriebselement als Gegenstand der Anmeldung angesehen.In the exhaust gas recirculation valve according to the invention, the drive element is rotatable at least in the opening direction with respect to the (for example as a result of adhesions) stuck valve member. Therefore, the rotation of the driving member is not prevented even when a seizing of the valve element, and by the rotation-stroke conversion mechanism, this rotation is converted into a lifting movement, so that the valve can be opened smoothly. Overall, a trouble-free operation can be guaranteed. In the exhaust gas recirculation valve according to the invention can be effected by the force acting between the drive element and the valve element friction, with which force should be a rotation of the valve element, and from which threshold a rotation between the drive element and the valve element is to be allowed to block avoid. If between the mentioned Elements acts a certain friction, adhesions or dirt, which apply less force than the friction described, can be solved by the valve element is rotated with the drive element, and thereby bonds are solved. However, should these prove to be stronger than the frictional engagement between said elements, the drive element will rotate with respect to the valve element, so that there will be no blockage even in this case, and the valve can be opened due to the rotational movement of the drive element. In this context, it should also be mentioned that the drive element is usually completely freely rotatable relative to the valve element with the exception of the friction described, and no springs or similar elements are interposed here. It should be noted, however, that, as can be seen from the figures, a common collar of the valve element in the region of a shoulder of the drive element can be inserted into this. In order to fasten the valve element with its widened collar, between a fastening element and the collar, for example, a plate spring may be interposed, which serves, however, the axial fixation. Between the valve element and the drive element, this spring does not act, so that even with the last-described arrangement there is a freely rotatable connection with the exception of the friction. This measure, ie a completely free rotation between valve element and drive element is provided in particular in the modification in which the drive element is not part of the rotary-hub conversion mechanism. Such an embodiment is conceivable despite the preceding embodiments and is considered in particular with a completely freely rotatable connection between the valve and drive element as the subject of the application.
Im Hinblick auf die vorangehend beschriebene Möglichkeit, durch die Einstellung bestimmter Reibungsverhältnisse zwischen Antriebs- und Ventilelement eine bestimmte Charakteristik im Hinblick auf das Lösen von Verschmutzungen zu erreichen, sei erwähnt, dass die erfindungsgemäße, drehbare, mittelbare oder unmittelbare Verbindung zwischen Antriebselement und Ventilelement auch bei einem Abgasrückführventil vorgesehen sein kann, das einen translatorischen Antrieb, beispielsweise ein Solenoid, anstelle des Drehantriebs aufweist. Bei einem derartigen Abgasrückführventil kann ebenfalls, um beim Öffnen Verklebungen zu lösen, eine Verdrehung des Ventilelements vorgesehen sein. Diese kann durch einen Dreh-Hub-Umwandlungsmechanismus erreicht werden, der die translatorische Antriebsbewegung in eine zumindest geringfügige Drehung des Ventilelements umwandelt. Mit anderen Worten wird ein Antriebselement in diesem Fall infolge der translatorischen Bewegung verdreht. Um auch hier ein Blockieren zu vermeiden, kann eine drehbare Verbindung zwischen Antriebselement und Ventilelement vorgesehen sein, um die Verdrehung zum Lösen von Verschmutzungen nicht zwangsweise vorzusehen, sondern das Ventil auch in dem Fall, dass eine Verdrehung durch Verklebungen blockiert wird, durch die translatorische Bewegung öffnen zu können.With regard to the possibility described above, by setting certain friction conditions between the drive and valve element a specific To achieve characteristics in terms of solving contaminants, it should be noted that the inventive, rotatable, direct or indirect connection between the drive element and valve element can also be provided in an exhaust gas recirculation valve having a translational drive, for example, a solenoid, instead of the rotary drive. In such an exhaust gas recirculation valve, in order to release adhesions when opening, a rotation of the valve element may also be provided. This can be achieved by a rotary-hub conversion mechanism that converts translatory drive motion into at least slight rotation of the valve element. In other words, a drive element is rotated in this case as a result of the translational movement. In order to avoid blocking, a rotatable connection between the drive element and the valve element can be provided in order not to forcibly provide the rotation for loosening contaminants, but also in the event that a rotation is blocked by adhesions, the valve by the translational movement to be able to open.
Bevorzugte Weiterbildungen des erfindungsgemäßen Abgasrückführventils sind in den weiteren Ansprüchen beschrieben.Preferred developments of the exhaust gas recirculation valve according to the invention are described in the further claims.
Für die drehbare Lagerung zwischen dem Antriebselement und dem Ventilelement hat sich eine Lagerbuchse als vorteilhaft erwiesen. Durch ein derartiges Element kann die vorangehend beschriebene Reibung realisiert werden. Insbesondere kann durch die Wahl geeigneter Passungsverhältnisse zwischen den genannten Elementen und/oder geeigneter Materialien eine gewünschte Charakteristik im Hinblick auf die Übertragung von Reibkraft realisiert werden.For the rotatable mounting between the drive element and the valve element, a bearing bush has proved to be advantageous. By such an element, the friction described above can be realized. In particular, a desired characteristic with regard to the transmission of frictional force can be realized by the choice of suitable fit ratios between said elements and / or suitable materials.
Wenngleich beim Schließen des Ventils zwangsweise ein Mitdrehen des Ventilelements mit dem Antriebselement vorgesehen sein kann, wird bevorzugt, dass das Antriebselement in sämtlichen Richtungen, d.h. auch in Schließrichtung, bezüglich des Ventilelements drehbar ist.Although when closing the valve forcibly turning the valve element with the drive element can be provided, it is preferred that the drive element in all directions, ie, in the closing direction, with respect to the valve element is rotatable.
Für den Dreh-Hub-Umwandlungsmechanismus wird eine Schraubbahn bevorzugt, in der zumindest eine feststehend angebrachte und drehbar gelagerte Rolle angeordnet ist. Mit anderen Worten ist in dem Antriebselement in diesem bevorzugten Fall beispielsweise eine Nut in Form einer vergleichsweise kurzen Schraublinie vorgesehen. Wenn sich das Antriebselement dreht, stützt sich eine Nutflanke an der in der Nut angeordneten Rolle ab und bewirkt dadurch infolge der Drehung des Antriebselements eine translatorische Bewegung desselben, die für das Öffnen und Schließen des Ventils genutzt werden kann.For the rotary-hub conversion mechanism, a screw track is preferred in which at least one fixedly mounted and rotatably mounted roller is arranged. In other words, in the drive element in this preferred case, for example, a groove in the form of a comparatively short helix is provided. When the drive element rotates, a groove flank is supported on the roller arranged in the groove and, as a result of the rotation of the drive element, causes a translatory movement of the same, which can be used for opening and closing the valve.
Wenngleich für das Ventilelement beliebige geeignete Bauarten denkbar sind, wird derzeit für das erfindungsgemäße Abgasrückführventil bevorzugt, dass das Ventilelement ein Ventilstößel mit einem daran angebrachten Ventilteller ist. Bevorzugt ist der Ventilstößel drehbar, jedoch axial fest mit dem Antriebselement verbunden, um die oben beschriebenen Vorteile zu realisieren. Es ist jedoch ebenso denkbar, dass der Ventilstößel, der in diesem Fall Teil des Dreh-Hub-Umwandlungsmechanismus ist, in jeder Hinsicht fest mit einem Antriebselement verbunden ist, und der Ventilteller bezüglich des Ventilstößels verdrehbar ist. Auch hierdurch kann ein Öffnen des Ventils durch eine Hubbewegung auch dann realisiert werden, wenn der Ventilteller an seinem Ventilsitz haftet, was bei einer zwangsweise vorgesehenen Drehung des Ventiltellers ein Blockieren des Ventils zur Folge hätte.Although any suitable designs are conceivable for the valve element, it is currently preferred for the exhaust gas recirculation valve according to the invention that the valve element is a valve tappet with a valve disk mounted thereon. Preferably, the valve stem is rotatable, but axially fixedly connected to the drive element in order to realize the advantages described above. However, it is also conceivable that the valve stem, which in this case is part of the rotary-hub conversion mechanism, is firmly connected in all respects with a drive element, and the valve disk with respect to the valve stem is rotatable. This also makes it possible to realize opening of the valve by means of a lifting movement even when the valve disk adheres to its valve seat, which would result in blockage of the valve in the event of a forcibly provided rotation of the valve disk.
Besondere Vorteile im Hinblick auf den Zusammenbau des erfindungsgemäßen Abgasrückführventils ergeben sich, wenn das Antriebselement zweiteilig gestaltet ist.Particular advantages with regard to the assembly of the exhaust gas recirculation valve according to the invention arise when the drive element is designed in two parts.
Die Erfindung wird nachfolgend anhand einer beispielhaft in den Zeichnungen dargestellten Ausführungsform näher erläutert. Es zeigen:
- Fig. 1
- eine Schnittdarstellung des erfindungsgemäßen Abgasrückführventils; und
- Fig. 2
- eine perspektivische, teilweise geschnittene Ansicht des erfindungsgemäßen Abgasrückführventils.
- Fig. 1
- a sectional view of the exhaust gas recirculation valve according to the invention; and
- Fig. 2
- a perspective, partially sectioned view of the exhaust gas recirculation valve according to the invention.
Das in Fig. 1 gezeigte Abgasrückführventil 10 weist in seinem oberen Bereich zunächst einige Gehäuseteile und Anschlüsse für die vorhandenen Lagerückmeldungssensoren und dergleichen auf. Für die vorliegende Erfindung kann sich die Beschreibung darauf konzentrieren, wie die Betätigung infolge einer Drehung eines Zahnrads 12 erfolgt. Es sei erwähnt, dass hinsichtlich des vorgesehenen Drehantriebs ein beliebiger Antrieb, wie z.B. ein Torque- oder DC-Motor denkbar ist. Es kommt lediglich darauf an, dass ein sogenanntes Antriebselement drehend antreibbar ist. Bei dem dargestellten Beispiel erfolgt dies über das genannte zahnrad 12, das über zwei Mitnahmestifte 46, von denen in der Figur nur einer erkennbar ist, mit dem Antriebselement 14 verbunden ist, das im Wesentlichen die Form einer Hülse aufweist. In einem oberen Bereich des Antriebselements 14 ist zunächst eine Feder 48 vorgesehen, die als Torsionsfeder gestaltet ist und das Antriebselement in den geschlossenen Zustand vorspannt, so dass auch bei einer Fehlfunktion des Antriebs eine zuverlässige Schließung möglich ist. Bei dieser Feder handelt es sich um eine Spiral- oder sogenannte Uhrmacher-Feder, die bei einem Öffnen des Ventils derart verformt wird, dass sie eine Drehkraft in Schließrichtung aufbringt. An dem Außenumfang des Antriebselements 14 ist im Wesentlichen in Form einer Nut 16 eine Bahn ausgebildet, die einen Abschnitt einer Schraublinie darstellt. In dieser Schraubbahn 16 befindet sich bei dem gezeigten Beispiel eine Rolle 18. Die Rolle 18 ist an einer Achse 20 bezüglich des Gehäuses 22 feststehend angebracht und um die Achse 20 drehbar.The exhaust
Wie ohne weiteres zu erkennen ist, bewirkt eine Drehung des Antriebselements 14, ausgehend von der in Fig. 1 dargestellten Situation, von oben betrachtet, entgegen dem Uhrzeigersinn, dass die Rolle 18 an der oberen Nutflanke 24 abrollt, und das Antriebselement 14 aufgrund der schraubenförmigen Gestalt der Bahn, in der sich die Rolle 18 befindet, nach oben bewegt wird, hierdurch erfolgt die Öffnung des Ventils, indem sich der Ventilteller 26 von dem Ventilsitz 28 löst. Dies wird insbesondere dadurch gewährleistet, dass in der inneren Bohrung des Antriebselements 14 ein Absatz 30, und an dem Ventilstößel 32 eine Verbreiterung 34 vorgesehen ist. Bei dem gezeigten Beispiel befindet sich zwischen dem Ventilstößel 32 und dem Antriebselement 14 noch eine Lagerbuchse 36, welche die Kraft beim Anheben von dem Antriebselement 14, insbesondere dessen Absatz 30, auf den Ventilstößel 32, insbesondere dessen Verbreiterung 34, überträgt. Beim Schließen erfolgt der Vorgang in umgekehrter Richtung. Durch die Drehung des Antriebselements 14 und das Abrollen der Rolle 18 in der schraubenförmigen Bahn am Außenumfang des Antriebselements 14 wird das Antriebselement 14 nach unten gedrückt. Durch die in axialer Richtung feste Anbringung des Ventilstößels 32 in dem Antriebselement wird dieser ebenfalls nach unten gedrückt, so dass der Ventilteller 26 wieder auf den Ventilsitz 28 gelangt, und das Ventil geschlossen wird.As will be readily appreciated, rotation of the
Erfindungsgemäß ist das Ventilelement, in dem gezeigten Fall der Ventilstößel 32, bezüglich des Antriebselements 14 drehbar gelagert. Dies erfolgt bei dem gezeigten Beispiel mittels der Lagerbuchse 36. Ausgehend von dem geschlossenen Zustand des Ventils, wie er in Fig. 1 gezeigt ist, kann sich somit das Antriebselement 14 bezüglich des möglicherweise aufgrund von Verklebungen festsitzenden Ventilelements 32 verdrehen. Da diese Drehbewegung auch bei einem haftenden Ventilelement ermöglicht wird, kann der Dreh-Hub-Umwandlungsmechanismus in Form der Schraubbahn 16 und Rolle 18 wirken und ein Anheben des Antriebselements 14 und damit ein Öffnen des Ventils erfolgen. Hierdurch kann ein störungsfreies Öffnen und insgesamt ein störungsfreier Betrieb realisiert werden. Es ist ergänzend zu erwähnen, dass in einem unteren Bereich des Ventilstößels 32 dieser drehund verschiebbar in geeigneten Lagerbuchsen 38, die in dem Gehäuse 22 angeordnet sind, gelagert sein kann. Hierbei kann ferner in vorteilhafter Weise eine Abdichtung vorgesehen sein.According to the invention, the valve element, in the case of the
In Fig. 2 ist das erfindungsgemäße Abgasrückführventil 10 ergänzend in einer perspektivischen Ansicht und mit weiteren Komponenten, beispielsweise einem Drehmotor 40, dargestellt. Die Drehung des Motors wird über verschiedene Zahnräder 42 auf ein Zahnrad 12, das etwas anders als bei der Ausführungsform von Fig. 1 angeordnet ist, und von dort auf das Antriebselement 14 übertragen. In Fig. 2 ist ergänzend zu erkennen, dass das Antriebselement 14 aus Fertigungsgründen zweiteilig gestaltet sein kann. Dies wird insbesondere dann, wie beispielhaft gezeigt, realisiert, wenn durch die Zweiteilung des Antriebselements 14 auch eine Zweiteilung der Schraubbahn 16 erfolgt, so dass diese mit anderen Worten durch die Kombination der beiden Teile des Antriebselements ausgebildet wird. Schließlich sei erwähnt, dass durch eine Torsionsfeder 44 sichergestellt werden kann, dass das Ventil in eine geschlossene Stellung vorbelastet wird, so dass auch bei einer Störung im Bereich des Drehantriebs 40 ein zuverlässiges Schließen erfolgt.In Fig. 2, the exhaust
Claims (6)
- Exhaust gas recirculation valve (10) having:a rotary drive (40), a rotation-lift conversion mechanism (14, 18), a drive element (14), which can be driven in rotating manner by the rotary drive (40), is part of the rotation-lift conversion mechanism (14, 18), and can be displaced in translational manner by the latter as a result of a rotation, and a valve element (32, 26), characterised in that the drive element (4) is connected to the valve element (32) to be freely rotatable with the exception of friction at least in opening direction.
- Exhaust gas recirculation valve according to claim 1, characterised in that a bearing bush (36) is provided between the drive element (14) and the valve element (32).
- Exhaust gas recirculation valve according to claim 1 or 2, characterised in that the drive element (14) with respect to the valve element (32) can also be rotated in closing direction.
- Exhaust gas recirculation valve according to at least one of the preceding claims, characterised in that the rotation-lift conversion mechanism (14, 18) has a screw path (16), in which at least one fixedly attached, rotatably mounted roller (18) is arranged.
- Exhaust gas recirculation valve according to at least one of the preceding claims, characterised in that the valve element is a valve tappet (32) with a valve disc (26) attached thereto.
- Exhaust gas recirculation valve according to at least one of the preceding claims, characterised in that the drive element (14) is designed to have two parts.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03024508A EP1526271B1 (en) | 2003-10-24 | 2003-10-24 | Exhaust gas recirculation valve |
DE50307471T DE50307471D1 (en) | 2003-10-24 | 2003-10-24 | Exhaust gas recirculation valve |
ES03024508T ES2288205T3 (en) | 2003-10-24 | 2003-10-24 | EXHAUST GAS FEEDBACK VALVE. |
PT03024508T PT1526271E (en) | 2003-10-24 | 2003-10-24 | Exhaust gas recirculation valve |
AT03024508T ATE364785T1 (en) | 2003-10-24 | 2003-10-24 | EXHAUST GAS RECIRCULATION VALVE |
CNB2004100820990A CN100359153C (en) | 2003-10-24 | 2004-10-24 | Exhaust gas recirculation valve |
KR1020040085435A KR100677923B1 (en) | 2003-10-24 | 2004-10-25 | Exhaust gas recirculation valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03024508A EP1526271B1 (en) | 2003-10-24 | 2003-10-24 | Exhaust gas recirculation valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1526271A1 EP1526271A1 (en) | 2005-04-27 |
EP1526271B1 true EP1526271B1 (en) | 2007-06-13 |
Family
ID=34384635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03024508A Expired - Lifetime EP1526271B1 (en) | 2003-10-24 | 2003-10-24 | Exhaust gas recirculation valve |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1526271B1 (en) |
KR (1) | KR100677923B1 (en) |
CN (1) | CN100359153C (en) |
AT (1) | ATE364785T1 (en) |
DE (1) | DE50307471D1 (en) |
ES (1) | ES2288205T3 (en) |
PT (1) | PT1526271E (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9045997B2 (en) | 2010-08-12 | 2015-06-02 | Halla Visteon Climate Control Corporation | Actuator for a wastegate or a variable turbine geometry device and method of actuation |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2172682B1 (en) * | 2008-10-06 | 2011-02-09 | Cooper-Standard Automotive (Deutschland) GmbH | Exhaust gas recirculation valve |
FR2937109B1 (en) * | 2008-10-14 | 2012-12-14 | Valeo Sys Controle Moteur Sas | EGR VALVE COMPRISING A SUPPORT TOOL |
FR2947027B1 (en) * | 2009-06-17 | 2011-07-15 | Valeo Sys Controle Moteur Sas | MOVEMENT TRANSFORMATION DEVICE AND VALVE HAVING SUCH A DEVICE |
EP2418373A1 (en) | 2010-08-12 | 2012-02-15 | Cooper-Standard Automotive (Deutschland) GmbH | Actuator and waste gas reclaiming valve, wastegate or variable turbine geometry with an actuator |
DE102011001535A1 (en) | 2011-03-24 | 2012-09-27 | Pierburg Gmbh | Automotive exhaust gas recirculation valve assembly |
FR2978998B1 (en) | 2011-08-08 | 2013-07-26 | Sonceboz Automotive Sa | COMPACT DOSING DEVICE |
CN104165104B (en) * | 2013-05-16 | 2018-05-11 | 福特汽车萨纳伊股份有限公司 | Exhaust gas recycling system |
CN104455678A (en) * | 2014-11-28 | 2015-03-25 | 长城汽车股份有限公司 | Egr valve driving mechanism |
FR3047535B1 (en) | 2016-02-09 | 2018-03-02 | Sonceboz Automotive Sa | LINEAR DOSING VALVE |
FR3068424B1 (en) * | 2017-06-30 | 2020-02-14 | Valeo Systemes De Controle Moteur | OPERATING DEVICE FOR MOTOR CONTROL ACTUATOR |
FR3071898B1 (en) * | 2017-10-04 | 2020-07-10 | Valeo Systemes De Controle Moteur | ACTUATOR AND FLUID CIRCULATION VALVE COMPRISING THE SAME |
WO2020015812A1 (en) * | 2018-07-16 | 2020-01-23 | Pierburg Gmbh | Valve arrangement for use in the automotive sector, and exhaust-gas recirculation valve |
CN109611244A (en) * | 2019-02-01 | 2019-04-12 | 联合汽车电子有限公司 | Exhaust gas recirculation valve |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1454423A (en) * | 1921-03-07 | 1923-05-08 | Continental Engineering Corp | Rotary valve for internal-combustion engines |
US1451423A (en) * | 1922-05-27 | 1923-04-10 | Royal Typewriter Co Inc | Typewriting machine |
US4346728A (en) * | 1980-07-28 | 1982-08-31 | Anchor/Darling Industries, Inc. | Automated dual mode valve actuator |
EP1045685B1 (en) * | 1998-10-16 | 2002-06-05 | Koninklijke Philips Electronics N.V. | Massaging apparatus having a suction chamber and two rollers |
DE19961756C1 (en) * | 1999-12-21 | 2001-04-19 | Siebe Automotive Deutschland Gmbh | Exhaust gas feedback valve for automobile engine has valve element rotated about its axis at least during inital part of its linear movement |
DE10044898A1 (en) * | 2000-09-12 | 2002-04-25 | Berger Lahr Gmbh & Co Kg | Valve |
-
2003
- 2003-10-24 EP EP03024508A patent/EP1526271B1/en not_active Expired - Lifetime
- 2003-10-24 DE DE50307471T patent/DE50307471D1/en not_active Expired - Lifetime
- 2003-10-24 ES ES03024508T patent/ES2288205T3/en not_active Expired - Lifetime
- 2003-10-24 PT PT03024508T patent/PT1526271E/en unknown
- 2003-10-24 AT AT03024508T patent/ATE364785T1/en active
-
2004
- 2004-10-24 CN CNB2004100820990A patent/CN100359153C/en active Active
- 2004-10-25 KR KR1020040085435A patent/KR100677923B1/en active IP Right Grant
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9045997B2 (en) | 2010-08-12 | 2015-06-02 | Halla Visteon Climate Control Corporation | Actuator for a wastegate or a variable turbine geometry device and method of actuation |
Also Published As
Publication number | Publication date |
---|---|
KR100677923B1 (en) | 2007-02-06 |
CN1641203A (en) | 2005-07-20 |
CN100359153C (en) | 2008-01-02 |
ATE364785T1 (en) | 2007-07-15 |
DE50307471D1 (en) | 2007-07-26 |
PT1526271E (en) | 2007-06-29 |
KR20050039684A (en) | 2005-04-29 |
ES2288205T3 (en) | 2008-01-01 |
EP1526271A1 (en) | 2005-04-27 |
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