EP2507498B1 - Valve arrangement for internal combustion engine - Google Patents
Valve arrangement for internal combustion engine Download PDFInfo
- Publication number
- EP2507498B1 EP2507498B1 EP10781694.4A EP10781694A EP2507498B1 EP 2507498 B1 EP2507498 B1 EP 2507498B1 EP 10781694 A EP10781694 A EP 10781694A EP 2507498 B1 EP2507498 B1 EP 2507498B1
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- Prior art keywords
- valve
- combustion engine
- internal combustion
- gear
- valve device
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Images
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
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
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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
Definitions
- the invention relates to a valve device for an internal combustion engine with a multi-part housing, a drive unit which generates a torque and is arranged in an engine compartment, a transmission unit which is arranged in a gear compartment, an eccentric which is drivable via the gear unit, a translationally movable Valve rod, which projects into a valve rod movement space, a coupling element, via which the movement of the eccentric is translatable into a translational movement of the valve rod, a valve seat between an inlet and an outlet and a valve closing body, which is attached to the valve rod and lowered onto the valve seat and can be lifted off the valve seat.
- Such valve devices are used in particular as exhaust gas recirculation valves.
- a gear unit is rotated, which has a coupling element, via which the rotational movement of the gears is converted into a translational movement of the valve stem.
- an exhaust gas flow which is attributed from the exhaust manifold to the intake manifold for the reduction of pollutant emissions, regulated over a wide range.
- the electric motor driven valves with the intermediate transmission have a high control accuracy.
- Exhaust gas recirculation valves are, however, exposed in the exhaust area of a high thermal load and progressive pollution.
- an exhaust gas recirculation valve in which a gear transmission is driven by an electric motor.
- the last transmission gear has a guide opening, in which a bolt projects, which is fixedly connected to the valve rod and extending perpendicular to this.
- the bolt moves in the guide opening, wherein a guided by the housing translational movement of a valve actuating rod follows. Ingress of blow-by gases into the gear compartment is prevented by dividing the valve rod into two axially superimposed sections, which are connected to one another via a fastening member, wherein a membrane is arranged on the outside of the fastening member.
- a motor cap is arranged in a receptacle of the housing, which separates the gear chamber from the engine compartment. In this way, an entry of Bürstenabbrand or abrasion from the engine compartment in the gear compartment is largely prevented.
- an output gear of the gear unit serves as an eccentric and the axis is arranged on the output gear. Accordingly, the eccentric is integrated in the output gear, so that it is possible to dispense with an eccentric as an additional component, which reduces the number of components and assembly times become.
- the output gear and the axle can be made in one piece in this embodiment or the axle are overmolded.
- the coupling element is attached to the valve rod and has a link in which a roller or a bearing is performed, which is arranged on the axis.
- the cover has a part-arc-shaped opening through which the axis protrudes.
- This opening forms the only connection between the valve rod movement space and the gear housing and is not in the immediate vicinity of the rotatably mounted axes. At relatively high shielding through the cover, however, the functionality is guaranteed.
- the cover is designed as a plate with bent perpendicular to the plate outer edges.
- Such a cover can be inserted without additional fastening means in the housing. The fastening takes place in such a case by positive locking.
- the outer edges are at least partially against in the same direction extending contact surfaces of the housing.
- the sealing distance is increased on the outer circumference of the cover, so that an additional flow resistance is created, which counteracts penetration of gases into the gear chamber.
- the housing consists of a cup-shaped motor housing part, a gear housing part, in in which the gear space is formed and in which the axes of rotation of the gears are fixed and a valve housing part in which the inlet and the outlet are formed with the valve seat.
- the contact surfaces for the outer edges of the cover are formed on the gear housing part, so that no displacement of the contact surfaces in the housing can arise with respect to the outer edges of the cover.
- a particularly advantageous form of transmission results when using a spur gear, in which the gear unit consists of a drive pinion, which meshes with the larger gear of a double gear whose smaller gear meshes with the output gear, which is designed as a gear segment.
- the gear unit consists of a drive pinion, which meshes with the larger gear of a double gear whose smaller gear meshes with the output gear, which is designed as a gear segment.
- a concentric to the axis of rotation of the driven gear recess is formed in the gear housing part, in which a coil spring is arranged, the first leg rests on the gear housing part and the second leg rests on the output gear, so that upon rotation of the gear from the closed position of the valve in the spring energy is stored for turning back the gear in the starting position.
- a coil spring is arranged, the first leg rests on the gear housing part and the second leg rests on the output gear, so that upon rotation of the gear from the closed position of the valve in the spring energy is stored for turning back the gear in the starting position.
- a stamped grid is injected in the gear housing part, which has connection pins of a connector formed on the gear housing part, a sensor and the drive unit.
- valve rod is guided translationally via a guide element in the housing and on the valve rod between the guide member and the coupling element, a sealing element is arranged.
- valve device which is largely insensitive to contamination, in particular by blow-by gases and thermal stress and at the same time has high space accuracy only a small space requirement and thus can be produced inexpensively.
- Valve device shown consists of a multi-part housing 2, which is composed of a cup-shaped motor housing part 4, a gear housing part 6 and a valve housing part 8.
- the gear housing part 6 has on its first side an annular projection 10, on the outer circumference with the interposition of a seal 12, the motor housing part 4 is fixed and the inner periphery forms a receptacle 14, in which a serving as a drive unit 16 electric motor is inserted.
- the electric motor 16 is largely closed at its end facing the gear housing part 6 by an engine cap 18, so that an engine compartment 20 is separated from the gear housing part 6. Only a drive shaft 22, on which a drive pinion 24 of a gear unit 26 is arranged rotationally fixed and two motor connection contacts, not shown, protrude through corresponding openings of the motor cap 18th
- the gear unit 26 is arranged and stored in a gear chamber 28. It consists of the drive pinion 24, which meshes with a larger gear 30 of a double gear 32, whose smaller gear 34 meshes with an output gear 36, which is designed as a gear segment, which is particularly in FIG. 3 can be seen.
- the double gear 32 as well as the driven gear 36 are each mounted on a pivot axis 38, 40 serving as the axle bolt, which is fixed in the gear housing part 6.
- annular recess 42 in which a biased in the direction of rotation Coil spring 44 is arranged, the first, not visible in the figures leg abuts against the gear housing part 6 and the second leg 46 abuts the driven gear 36. This is further rotated upon rotation of the output gear 36 from its original position, so that this spring 44 can be used as a return spring, which rotates the gear unit 26 in a known manner to its initial position, for example, if the drive unit 16 should fail.
- an axis 48 is disposed outside the axis of rotation 40, which extends parallel to the axis of rotation 40 and is moved on rotation of the output gear 36 on a circular arc about the axis of rotation 40.
- This axle 48 can both be overmolded in the production of the driven gear 36 as well as integrally made with this or otherwise secured to the gear 36. Accordingly, the output gear 36 simultaneously acts as an eccentric 37, so that it is possible to dispense with an additional eccentric component.
- the axis 48 extends through a likewise part-circular arc-shaped opening 50 of a cover 52, which according to the invention separates the gear chamber 28 from a valve rod movement chamber 54 into which the axle 48 projects.
- the cover 52 whose shape in FIG. 3 is substantially formed as a flat plate 56 from which extend at an angle of 90 ° to the plate outer edges 58. These outer edges 58 abut against correspondingly formed contact surfaces 60 of the gear housing part 6, whereby a positive fastening in the gear housing part 6 is formed, without having to use additional fasteners. Further, this elongated abutment surface increases the leaktightness of the gear compartment 28, which is separated from its surroundings to the first side by the motor cap 18 and to the opposite side by the cover 52. A Connection exists only through the openings 50, through which the shafts 22 and axes 48 for driving out or in the gear chamber 28 protrude.
- a roller 62 is arranged on the axis 48, which is guided in a link 64 of a coupling element 66, which in turn is firmly connected to a valve rod 68 of the valve device.
- the scenery 64 which in FIG. 2 can be seen, it may have a curved shape to represent specific required force-stroke profiles.
- valve rod 68 protrudes through a corresponding opening of the valve housing part 8, in which a guide element 70 is arranged, via which the valve rod 68 is mounted so that only a pure lifting movement is possible.
- a sealing element 72 is arranged in the valve housing part 8, which surrounds the valve rod 68 and significantly reduces a blow-by gas flow penetrating along the valve rod 68 into the valve rod movement space 54.
- a shielding element 74 is arranged, which dissolves deposits on the valve rod 68 and also improves the seal on the valve rod 68.
- a valve closing body 76 On the end of the valve rod 68, a valve closing body 76 is fixed in a known manner, which separates an inlet 78 of the valve from an outlet 80 in the position shown. For this purpose, the valve closing body rests on a valve seat 82.
- a support member 84 is attached to the coupling element 66 beyond the coupling element 66, which is moved with the valve rod 68.
- This carrier element 84 has a ceramic insulating body 86 which extends over the cross section of the support member 84, so that a thermal separation between the optionally thermally highly loaded valve rod and the beyond the insulating body 86 arranged part of the support member 84 is formed.
- the carrier element 84 has an opening in which a permanent magnet 88 is attached. This communicates with a non-contact sensor 90 which is encapsulated in the gear housing part 6, is arranged parallel to the direction of movement of the support member 84 adjacent thereto.
- the sensor 90 is connected via a punched grid 92 with a plug 94, the connection pins 96 are formed by the ends of the punched grid 92. Further lines of the stamped grid 92 form motor terminals, which are plugged together with the motor contacts, so that both the control of the drive unit 16 and the bearing feedback of the valve device can be made via the plug 94.
- the stamped grid 92 is inserted and molded in the production in the injection mold of the gear housing part 6, so that a release of the electrical contacts is reliably prevented.
- a control unit will provide a required voltage via the connection pins 96 of the plug 94 of the drive unit 16.
- the gear unit 26 is rotated and thus the driven gear 36.
- the axis 48 is rotated on a circular arc about the rotation axis 40, so that the roller 62 runs in the link 64.
- a rotation of the valve rod 68 is prevented by a contour 98 on the valve housing part 8, as from FIG. 2 evident.
- the position of the valve slider body 76 is reported back via the magnetic field changing on the sensor 90 by the movement of the permanent magnet 88 with the carrier element 84 in a known manner via the plug 94, so that upon reaching the required position, the drive unit 16 is turned off.
- this valve device requires only a small space.
- the assembly is simple, while the number of components has also been minimized, so that significant cost advantages are achieved with extended life.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanically-Actuated Valves (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Description
Die Erfindung betrifft eine Ventilvorrichtung für eine Verbrennungskraftmaschine mit einem mehrteiligen Gehäuse, einer Antriebseinheit, die ein Drehmoment erzeugt und in einem Motorraum angeordnet ist, einer Getriebeeinheit, die in einem Getrieberaum angeordnet ist, einem Exzenter, der über die Getriebeeinheit antreibbar ist, einer translatorisch bewegbaren Ventilstange, die in einen Ventilstangenbewegungsraum ragt, einem Kopplungselement, über welches die Bewegung des Exzenters in eine translatorische Bewegung der Ventilstange umwandelbar ist, einem Ventilsitz zwischen einem Einlass und einem Auslass und einem Ventilschließkörper, der an der Ventilstange befestigt ist und auf den Ventilsitz absenkbar und vom Ventilsitz abhebbar ist.The invention relates to a valve device for an internal combustion engine with a multi-part housing, a drive unit which generates a torque and is arranged in an engine compartment, a transmission unit which is arranged in a gear compartment, an eccentric which is drivable via the gear unit, a translationally movable Valve rod, which projects into a valve rod movement space, a coupling element, via which the movement of the eccentric is translatable into a translational movement of the valve rod, a valve seat between an inlet and an outlet and a valve closing body, which is attached to the valve rod and lowered onto the valve seat and can be lifted off the valve seat.
Derartige Ventilvorrichtungen werden insbesondere als Abgasrückführventile verwendet. Über die zumeist elektromotorische Antriebseinheit wird eine Getriebeeinheit in Drehung versetzt, die ein Kopplungselement aufweist, über welches die rotatorische Bewegung der Zahnräder in eine translatorische Bewegung der Ventilstange umgewandelt wird. Mittels dieser Ventile wird ein Abgasstrom, der vom Abgaskrümmer zum Saugrohr zur Verminderung von Schadstoffemissionen zurückgeführt wird, über einen weiten Bereich geregelt. Die elektromotorisch angetriebenen Ventile mit dem zwischengeschalteten Getriebe weisen dabei eine hohe Regelgenauigkeit auf. Abgasrückführventile sind jedoch im Abgasbereich einer hohen thermischen Belastung und einer fortschreitenden Verschmutzung ausgesetzt.Such valve devices are used in particular as exhaust gas recirculation valves. About the mostly electric motor drive unit, a gear unit is rotated, which has a coupling element, via which the rotational movement of the gears is converted into a translational movement of the valve stem. By means of these valves, an exhaust gas flow, which is attributed from the exhaust manifold to the intake manifold for the reduction of pollutant emissions, regulated over a wide range. The electric motor driven valves with the intermediate transmission have a high control accuracy. Exhaust gas recirculation valves are, however, exposed in the exhaust area of a high thermal load and progressive pollution.
So ist aus der
Ein solcher Aufbau vermindert zwar das Eindringen von Blow-by-Gasen, jedoch ist der Aufbau sowohl bezüglich der Anzahl der Bauteile als auch bezüglich des Zusammenbaus sehr aufwendig. Des Weiteren besteht ein erhöhter Platzbedarf.Although such a structure reduces the penetration of blow-by gases, but the structure is very expensive both in terms of the number of components as well as with respect to the assembly. Furthermore, there is an increased space requirement.
Zusätzlich ist aus der
Dieser Aufbau vermindert zwar das Eindringen von Blow-by-Gasen in das Getriebe, hat jedoch seine Öffnung zum Ventilstangenbewegungsraum exakt im Bereich der sich drehenden Achse, welche somit weiterhin als besonders empfindliches Bauteil durch das heiße Abgas belastet ist. Des Weiteren ist der axiale Bauraum eines derartigen Ventils durch das Planetengetriebe und den folgenden Exzenter relativ groß.Although this construction reduces the penetration of blow-by gases in the transmission, but has its opening to the valve rod movement space exactly in the region of the rotating axis, which is thus still charged as a particularly sensitive component by the hot exhaust gas. Of Furthermore, the axial space of such a valve by the planetary gear and the following eccentric is relatively large.
Es ist daher Aufgabe der Erfindung, eine Ventilvorrichtung zu schaffen, mit der ein Eindringen von Verschmutzungen in ein Getriebe und insbesondere in die empfindlichen, sich drehenden Teile des Getriebes möglichst verhindert werden kann. Gleichzeitig sollen die thermische Belastung der empfindlichen Teile der Ventilvorrichtung reduziert werden und der benötigte Bauraum minimiert werden.It is therefore an object of the invention to provide a valve device, with the penetration of contaminants in a transmission and in particular in the sensitive, rotating parts of the transmission can be prevented as possible. At the same time, the thermal load of the sensitive parts of the valve device to be reduced and the required space can be minimized.
Diese Aufgabe wird dadurch gelöst, dass eine Abdeckung zwischen dem Exzenter und dem Kopplungselement angeordnet ist, die den Getrieberaum vom Ventilstangenbewegungsraum trennt. Somit befindet sich der Exzenter mit seiner Drehachse im abgekapselten Getrieberaum. Die Drehachse ist somit im Vergleich zu bekannten Ausführungen zusätzlich vor Verschmutzung durch eindringende Blow-by-Gase geschützt.This object is achieved in that a cover between the eccentric and the coupling element is arranged, which separates the gear chamber from the valve rod movement space. Thus, the eccentric is located with its axis of rotation in encapsulated gear compartment. The axis of rotation is thus in addition to known designs additionally protected against contamination by penetrating blow-by gases.
Vorzugsweise ist in einer Aufnahme des Gehäuses eine Motorkappe angeordnet, die den Getrieberaum vom Motorraum trennt. Auf diese Weise wird ein Eintrag von Bürstenabbrand oder -abrieb vom Motorraum in den Getrieberaum weitestgehend verhindert.Preferably, a motor cap is arranged in a receptacle of the housing, which separates the gear chamber from the engine compartment. In this way, an entry of Bürstenabbrand or abrasion from the engine compartment in the gear compartment is largely prevented.
Besonders bevorzugt ist es, eine Achse am Exzenter zu befestigen, die auf einer Kreisbahn um die Drehachse des Exzenters bewegbar ist. Durch diese Ausführung wird eine besonders einfache Kopplung zur Ventilstange ermöglicht.It is particularly preferred to fix an axis on the eccentric, which is movable on a circular path about the axis of rotation of the eccentric. This design allows a particularly simple coupling to the valve stem.
Eine besondere Ausführung wird geschaffen, indem ein Abtriebszahnrad der Getriebeeinheit als Exzenter dient und die Achse am Abtriebszahnrad angeordnet ist. Entsprechend ist der Exzenter in das Abtriebszahnrad integriert, so dass auf einen Exzenter als zusätzliches Bauteil verzichtet werden kann, wodurch Bauteileanzahl und Montagezeiten verringert werden. Selbstverständlich können das Abtriebszahnrad und die Achse in dieser Ausführung einstückig hergestellt werden oder die Achse umspritzt werden.A particular embodiment is provided by an output gear of the gear unit serves as an eccentric and the axis is arranged on the output gear. Accordingly, the eccentric is integrated in the output gear, so that it is possible to dispense with an eccentric as an additional component, which reduces the number of components and assembly times become. Of course, the output gear and the axle can be made in one piece in this embodiment or the axle are overmolded.
In einer weiterführenden Ausführung ist das Kopplungselement an der Ventilstange befestigt und weist eine Kulisse auf, in der eine Rolle oder ein Lager geführt ist, die oder das auf der Achse angeordnet ist. So wird die Drehbewegung des Zahnrades auf besonders einfache Weise in eine translatorische Bewegung der Ventilstange umgewandelt. Reibungskräfte werden minimiert, so dass lediglich geringe Stellkräfte erforderlich sind.In a further embodiment, the coupling element is attached to the valve rod and has a link in which a roller or a bearing is performed, which is arranged on the axis. Thus, the rotational movement of the gear is converted in a particularly simple manner in a translational movement of the valve stem. Frictional forces are minimized, so that only small actuating forces are required.
Bei einer derartigen Ausführung weist vorzugsweise die Abdeckung eine teilkreisbogenförmige Öffnung auf, durch welche die Achse hindurch ragt. Diese Öffnung bildet die einzige Verbindung zwischen Ventilstangenbewegungsraum und Getrieberaum und liegt nicht in unmittelbarer Nähe zu den drehbeweglich gelagerten Achsen. Bei relativ hoher Abschirmung durch die Abdeckung wird dennoch die Funktionsfähigkeit gewährleistet.In such an embodiment, preferably, the cover has a part-arc-shaped opening through which the axis protrudes. This opening forms the only connection between the valve rod movement space and the gear housing and is not in the immediate vicinity of the rotatably mounted axes. At relatively high shielding through the cover, however, the functionality is guaranteed.
Vorzugsweise ist die Abdeckung als Platte mit senkrecht zur Platte umgebogenen Außenkanten ausgeführt. Eine derartige Abdeckung kann ohne zusätzliche Befestigungsmittel im Gehäuse eingelegt werden. Das Befestigen erfolgt in einem derartigen Fall durch Formschluss.Preferably, the cover is designed as a plate with bent perpendicular to the plate outer edges. Such a cover can be inserted without additional fastening means in the housing. The fastening takes place in such a case by positive locking.
In einer weiterführenden Ausführung liegen die Außenkanten zumindest teilweise gegen sich in gleicher Richtung erstreckende Anlageflächen des Gehäuses an. Hierdurch wird die Dichtstrecke am Außenumfang der Abdeckung erhöht, so dass ein zusätzlicher Strömungswiderstand geschaffen wird, der einem Eindringen von Gasen in den Getrieberaum entgegenwirkt.In a further embodiment, the outer edges are at least partially against in the same direction extending contact surfaces of the housing. As a result, the sealing distance is increased on the outer circumference of the cover, so that an additional flow resistance is created, which counteracts penetration of gases into the gear chamber.
In einer vorteilhaften Ausgestaltung der Erfindung besteht das Gehäuse aus einem topfförmigen Motorgehäuseteil, einem Getriebegehäuseteil, in welchem der Getrieberaum ausgebildet ist und in dem die Drehachsen der Zahnräder befestigt sind und einem Ventilgehäuseteil, in dem der Einlass und der Auslass mit dem Ventilsitz ausgebildet sind. Dieser Aufbau ermöglicht eine hohe Dichtigkeit gegenüber der außenliegenden Atmosphäre bei einfacher Montage.In an advantageous embodiment of the invention, the housing consists of a cup-shaped motor housing part, a gear housing part, in in which the gear space is formed and in which the axes of rotation of the gears are fixed and a valve housing part in which the inlet and the outlet are formed with the valve seat. This structure allows a high degree of impermeability to the outside atmosphere with simple installation.
In einer weiterführenden Ausführung sind die Anlageflächen für die Außenkanten der Abdeckung am Getriebegehäuseteil ausgebildet, so dass keine Verschiebung der Anlageflächen im Gehäuse bezüglich der Außenkanten der Abdeckung entstehen kann.In a further embodiment, the contact surfaces for the outer edges of the cover are formed on the gear housing part, so that no displacement of the contact surfaces in the housing can arise with respect to the outer edges of the cover.
Eine besonders vorteilhafte Getriebeform ergibt sich bei Verwendung eines Stirnradgetriebes, bei dem die Getriebeeinheit aus einem Antriebsritzel besteht, welches mit dem größeren Zahnrad eines Doppelzahnrades kämmt, dessen kleineres Zahnrad mit dem Abtriebszahnrad kämmt, welches als Zahnradsegment ausgeführt ist. Ein derartiges Getriebe benötigt bei großer Übersetzung nur einen geringen Bauraum und ist einfach zu montieren.A particularly advantageous form of transmission results when using a spur gear, in which the gear unit consists of a drive pinion, which meshes with the larger gear of a double gear whose smaller gear meshes with the output gear, which is designed as a gear segment. Such a transmission requires only a small space and is easy to install with a large translation.
Vorzugsweise ist im Getriebegehäuseteil eine zur Drehachse des Abtriebszahnrades konzentrische Ausnehmung ausgeformt, in der eine Schraubenfeder angeordnet ist, deren erster Schenkel am Getriebegehäuseteil anliegt und deren zweiter Schenkel am Abtriebszahnrad anliegt, so dass bei Drehung des Zahnrades aus der geschlossenen Stellung des Ventils in der Feder Energie zum Rückdrehen des Zahnrades in die Ausgangsposition gespeichert wird. Eine derartige Anordnung bewirkt die Möglichkeit zur Erweiterung des Exzenterdrehwinkels. Daraus resultiert ein günstiger Kraftverlauf über den Drehwinkel, so dass in den Extremlagen hohe Kräfte zum Losbrechen des Ventils oder zur Überwindung von Druckdifferenzen aufgebracht werden können.Preferably, a concentric to the axis of rotation of the driven gear recess is formed in the gear housing part, in which a coil spring is arranged, the first leg rests on the gear housing part and the second leg rests on the output gear, so that upon rotation of the gear from the closed position of the valve in the spring energy is stored for turning back the gear in the starting position. Such an arrangement causes the possibility of extending the Exzenterdrehwinkels. This results in a favorable force curve over the angle of rotation, so that high forces can be applied in the extreme positions to break the valve or to overcome pressure differences.
Auch ist es vorteilhaft, dass im Getriebegehäuseteil ein Stanzgitter eingespritzt ist, welches Anschlusspins eines am Getriebegehäuseteil ausgebildeten Steckers, eines Sensors und der Antriebseinheit aufweist. So kann die elektrische Versorgung des Ventils sowie die Lagerückmeldung über die gesamte Lebensdauer sichergestellt werden, da ein Lösen von Kontakten aufgrund von Erschütterungen des Ventils ausgeschlossen ist.It is also advantageous that a stamped grid is injected in the gear housing part, which has connection pins of a connector formed on the gear housing part, a sensor and the drive unit. Thus, the electrical supply of the valve and the bearing feedback can be ensured over the entire life, since a loosening of contacts due to vibration of the valve is excluded.
Eine zusätzliche Dichtheit bereits im Übergang zwischen dem Abgas führenden Bereich und dem Ventilstangenbewegungsraum wird dadurch erreicht, dass die Ventilstange über ein Führungselement im Gehäuse translatorisch geführt ist und auf der Ventilstange zwischen dem Führungselement und dem Kopplungselement ein Dichtelement angeordnet ist.An additional tightness already in the transition between the exhaust gas leading area and the valve rod movement space is achieved in that the valve rod is guided translationally via a guide element in the housing and on the valve rod between the guide member and the coupling element, a sealing element is arranged.
Durch die Anordnung einer Kontur am Getriebegehäuseteil, welche als Führung des Kopplungselementes dient, wird ein Verdrehen des Kopplungselementes und damit der Ventilstange verhindert.By arranging a contour on the gear housing part, which serves as a guide of the coupling element, a rotation of the coupling element and thus the valve rod is prevented.
Es wird somit eine Ventilvorrichtung geschaffen, welche gegen Verschmutzung insbesondere durch Blow-by-Gase und thermische Belastung weitestgehend unempfindlich ist und gleichzeitig bei hoher Stellgenauigkeit lediglich einen geringen Bauraumbedarf aufweist und somit kostengünstig herstellbar ist.It is thus provided a valve device which is largely insensitive to contamination, in particular by blow-by gases and thermal stress and at the same time has high space accuracy only a small space requirement and thus can be produced inexpensively.
Ein Ausführungsbeispiel einer erfindungsgemäßen Ventilvorrichtung ist in den Figuren dargestellt und wird nachfolgend beschrieben.
-
Figur 1 zeigt eine Seitenansicht einer erfindungsgemäßen Ventilvorrichtung in geschnittener Darstellung. -
zeigt in perspektivischer Darstellung die Ventilbaugruppe.Figur 2 -
Figur 3 zeigt eine perspektivische Ansicht der Getriebeeinheit und der Antriebseinheit der erfindungsgemäßen Ventilvorrichtung ausFigur 1 , wobei Teile der Getriebeeinheit als Explosionszeichnung dargestellt sind.
-
FIG. 1 shows a side view of a valve device according to the invention in a sectional view. -
FIG. 2 shows a perspective view of the valve assembly. -
FIG. 3 shows a perspective view of the gear unit and the drive unit of the valve device according to the inventionFIG. 1 , wherein parts of the gear unit are shown as an exploded view.
Die in
Das Getriebegehäuseteil 6 weist an seiner ersten Seite einen ringförmigen Vorsprung 10 auf, an dessen Außenumfang unter Zwischenlage einer Dichtung 12 das Motorgehäuseteil 4 befestigt ist und dessen Innenumfang eine Aufnahme 14 bildet, in die ein als Antriebseinheit 16 dienender Elektromotor gesteckt ist. Der Elektromotor 16 ist an seinem zum Getriebegehäuseteil 6 weisenden Ende durch eine Motorkappe 18 weitestgehend verschlossen, so dass ein Motorraum 20 gegenüber dem Getriebegehäuseteil 6 abgetrennt wird. Lediglich eine Antriebswelle 22, auf der ein Antriebsritzel 24 einer Getriebeeinheit 26 drehfest angeordnet ist sowie zwei nicht dargestellte Motoranschlusskontakte ragen durch entsprechende Öffnungen der Motorkappe 18.The
Im Getriebegehäuseteil 6 ist die Getriebeeinheit 26 in einem Getrieberaum 28 angeordnet und gelagert. Sie besteht aus dem Antriebsritzel 24, welches mit einem größeren Zahnrad 30 eines Doppelzahnrades 32 kämmt, dessen kleineres Zahnrad 34 mit einem Abtriebszahnrad 36 kämmt, welches als Zahnradsegment ausgeführt ist, was insbesondere in
Zusätzlich ist im Getrieberaum 28 eine zur Drehachse des Abtriebszahnrades 36 konzentrisch angeordnete ringförmige Ausnehmung 42 ausgebildet, in der eine in Verdrehrichtung vorgespannte Schraubenfeder 44 angeordnet ist, deren erster, in den Figuren nicht sichtbarer Schenkel gegen das Getriebegehäuseteil 6 anliegt und deren zweiter Schenkel 46 am Abtriebszahnrad 36 anliegt. Diese wird bei Drehung des Abtriebszahnrades 36 aus seiner Ausgangsposition weiter verdreht, so dass diese Feder 44 als Rückstellfeder verwendet werden kann, welche die Getriebeeinheit 26 in bekannter Weise in ihre Ausgangsstellung zurückdreht, falls beispielsweise die Antriebseinheit 16 ausfallen sollte.In addition, in the gear chamber 28 a concentrically arranged to the rotational axis of the driven
Am Abtriebszahnrad 36 ist außerhalb der Drehachse 40 eine Achse 48 angeordnet, die sich parallel zur Drehachse 40 erstreckt und bei Drehung des Abtriebszahnrades 36 auf einem Kreisbogen um die Drehachse 40 bewegt wird. Diese Achse 48 kann sowohl bei der Herstellung des Abtriebszahnrades 36 umspritzt werden als auch einstückig mit diesem hergestellt oder anderweitig am Zahnrad 36 befestigt werden. Entsprechend wirkt das Abtriebszahnrad 36 gleichzeitig als Exzenter 37, so dass auf ein zusätzliches Exzenterbauteil verzichtet werden kann.On the
Die Achse 48 erstreckt sich durch eine ebenfalls teilkreisbogenförmige Öffnung 50 einer Abdeckung 52, weiche erfindungsgemäß den Getrieberaum 28 von einem Ventilstangenbewegungsraum 54 trennt, in den die Achse 48 ragt.The
Die Abdeckung 52, deren Form in
Im Ventilstangenbewegungsraum 54 ist auf der Achse 48 eine Rolle 62 angeordnet, die in einer Kulisse 64 eines Kopplungselementes 66 geführt ist, weiches wiederum fest mit einer Ventilstange 68 der Ventilvorrichtung verbunden ist. Die Kulisse 64, welche in
Die Ventilstange 68 ragt durch eine entsprechende Öffnung des Ventilgehäuseteils 8, in welchem ein Führungselement 70 angeordnet ist, über welches die Ventilstange 68 so gelagert ist, dass lediglich eine reine Hubbewegung möglich ist. Zwischen diesem Führungselement 70 und dem Ventilstangenbewegungsraum ist ein Dichtelement 72 im Ventilgehäuseteil 8 angeordnet, welches die Ventilstange 68 umgibt und einen entlang der Ventilstange 68 in den Ventilstangenbewegungsraum 54 eindringenden Blow-by Gasstrom deutlich reduziert. Am entgegengesetzten Ende des Führungselementes ist, wiederum die Ventilstange umgebend, ein Abschirmelement 74 angeordnet, welches Ablagerungen an der Ventilstange 68 löst und ebenfalls die Abdichtung an der Ventilstange 68 verbessert.The
Auf dem Ende der Ventilstange 68 ist in bekannter Weise ein Ventilschließkörper 76 befestigt, der in der dargestellten Position einen Einlass 78 des Ventils von einem Auslass 80 trennt. Hierzu liegt der Ventilschließkörper auf einem Ventilsitz 82 auf.On the end of the
Am entgegengesetzten axialen Ende der Ventilstange 68 ist jenseits des Kopplungselementes 66 ein Trägerelement 84 am Kopplungselement 66 befestigt, welches mit der Ventilstange 68 bewegt wird. Dieses Trägerelement 84 weist einen keramischen Isolationskörper 86 auf, der sich über den Querschnitt des Trägerelementes 84 erstreckt, so dass eine thermische Trennung zwischen der gegebenenfalls thermisch hochbelasteten Ventilstange und dem jenseits des Isolationskörpers 86 angeordneten Teil des Trägerelementes 84 entsteht. In diesem thermisch abgetrennten Bereich weist das Trägerelement 84 eine Öffnung auf, in der ein Permanentmagnet 88 befestigt ist. Dieser kommuniziert mit einem berührungslosen Sensor 90, der umspritzt im Getriebegehäuseteil 6, parallel zur Bewegungsrichtung des Trägerelementes 84 neben diesem angeordnet ist.At the opposite axial end of the
Der Sensor 90 ist über ein Stanzgitter 92 mit einem Stecker 94 verbunden, dessen Anschlusspins 96 durch die Enden des Stanzgitters 92 gebildet werden. Weitere Leitungen des Stanzgitters 92 bilden Motoranschlüsse, die mit den Motorkontakten zusammengesteckt werden, so dass sowohl die Ansteuerung der Antriebseinheit 16 als auch die Lagerückmeldung der Ventilvorrichtung über den Stecker 94 erfolgen kann. Das Stanzgitter 92 wird bei der Herstellung in die Spritzgussform des Getriebegehäuseteils 6 eingelegt und umspritzt, so dass ein Lösen der elektrischen Kontakte zuverlässig verhindert wird.The
Soll nun die Verbindung vom Einlass 78 zum Auslass 80 zumindest teilweise geöffnet werden, wird eine Steuereinheit über die Anschlusspins 96 des Steckers 94 der Antriebseinheit 16 eine benötigte Spannung zur Verfügung stellen. Durch Drehen der Antriebseinheit 16 wird die Getriebeeinheit 26 in Drehung versetzt und damit das Abtriebszahnrad 36. Dadurch wird die Achse 48 auf einem Kreisbogen um die Drehachse 40 gedreht, so dass die Rolle 62 in der Kulisse 64 abläuft. Dies erzwingt eine translatorische Bewegung des Kopplungselementes 66 und damit der Ventilstange 68 und des Ventilschließkörpers 76, der vom Ventilsitz 82 abgehoben wird, so dass ein Gasstrom vom Einlass 78 zum Auslass 80 fließen kann. Bei dieser Bewegung wird ein Verdrehen der Ventilstange 68 durch eine Kontur 98 am Ventilgehäuseteil 8 verhindert, wie aus
Die Stellung des Ventilschiießkörpers 76 wird dabei über das sich am Sensor 90 durch die Bewegung des Permanentmagneten 88 mit dem Trägerelement 84 ändernde magnetische Feld in bekannter Weise über den Stecker 94 zurückgemeldet, so dass bei Erreichen der geforderten Stellung die Antriebseinheit 16 abgestellt wird.The position of the
Im Bereich des Auslasses 80 sind Druckpulsationen vorhanden, die dazu führen, dass trotz des Dichtelementes 72 Blow-by Gase entlang der Ventilstange 68 in den Ventilstangenbewegungsraum 54 gelangen. Ein Eindringen dieser Gase in den Getrieberaum kann jedoch zu großen Teilen durch die zusätzliche Abdeckung 52 verhindert werden. Insbesondere befindet sich die Öffnung 50 der Abdeckung 52 nicht direkt gegenüber eines drehgelagerten Teils des Getriebes 26, so dass ein vorrangiges Eindringen des dennoch in den Getrieberaum 28 gelangenden Gases ebenfalls geringere Auswirkungen hat.In the region of the outlet 80, pressure pulsations are present which lead to blow-by gases reaching the valve
Bei hoher Schmutzunempfindlichkeit benötigt diese Ventilvorrichtung nur einen geringen Bauraum. Die Montage ist einfach, wobei die Bauteileanzahl ebenfalls minimiert wurde, so dass deutliche Kostenvorteile bei verlängerter Lebensdauer erzielt werden.At high dirt insensitivity, this valve device requires only a small space. The assembly is simple, while the number of components has also been minimized, so that significant cost advantages are achieved with extended life.
Claims (15)
- A valve device for an internal combustion engine, comprising
a multi-part housing (2),
a drive unit (16) generating a rotational moment and arranged in a motor chamber (20),
a transmission unit (26) arranged in a transmission chamber (28),
an eccentric (37) that is drivable via the transmission unit (26),
a valve rod (68) that is displaceable in translation, said valve rod (68) extending into a valve rod moving chamber (54),
a coupling element (66) by means of which the displacement of the eccentric (37) can be converted into a translational displacement of the valve rod (68),
a valve seat (82) between an inlet (78) and an outlet (80), and
a valve closing body (76) that is attached to the valve rod (68) and can be lowered onto the valve seat (82) and be lifted off the valve seat (82),
characterized in that
a cover (52) is disposed between the eccentric (37) and the coupling element (66), said cover separating the transmission chamber (28) from the valve rod displacement chamber (54). - The valve device for an internal combustion engine according to claim 1,
characterized in that
in a receiving portion (14) of the housing (2), a motor cap (18) is arranged, said motor cap separating the transmission chamber (28) from the motor chamber (20). - The valve device for an internal combustion engine according to any one of claims 1 or 2,
characterized in that
an axis (48) is fastened to the eccentric (37) and is moveable on a circular path around the rotary axis (40) of the eccentric (37). - The valve device for an internal combustion engine according to claim 3,
characterized in that
a drive gear (36) of the transmission unit (26) serves as an eccentric (37) and said axis (48) is arranged on the drive gear (36). - The valve device for an internal combustion engine according to any one of the preceding claims,
characterized in that
the coupling element (66) is fastened to the valve rod (68) and comprises a slotted guide portion (64) guiding therein a roll (62) or bearing arranged on said axis (48). - The valve device for an internal combustion engine according to any one of the preceding claims,
characterized in that
the cover (52) comprises a opening (50) shaped as part of a circular arc, said opening having said axis (48) extending therethrough. - The valve device for an internal combustion engine according to any one of the preceding claims,
characterized in that
the cover (52) is formed as a plate (56) having outer edges (58) bent vertically to said plate (56). - The valve device for an internal combustion engine according to claim 7,
characterized in that
the outer edges (58) are arranged in at least partial abutment on abutment faces (60) of the housing (2) which extend in the same direction. - The valve device for an internal combustion engine according to any one of the preceding claims,
characterized in that
the housing (2) comprises a pot-shaped motor housing portion (4), a transmission housing portion (6) in which the transmission chamber (28) is formed and in which the rotary axes (38,40) of the gears (32,36) are attached, and a valve housing portion (8) in which the inlet (78) and the outlet (80) together with the valve seat (82) are formed. - The valve device for an internal combustion engine according to claim 9,
characterized in that
the abutment faces (60) for the outer edges (58) of the cover (52) are formed on the transmission housing portion (6). - The valve device for an internal combustion engine according to any one of the preceding claims,
characterized in that
the transmission unit (26) comprises a drive pinion (24) meshing with the larger gear (30) of a double gear (32) of which the smaller gear (34) meshes with the output gear (36) which is formed as a gear segment. - The valve device for an internal combustion engine according to any one of claims 9 to 11,
characterized in that,
the transmission housing portion (6) includes a recess (42) concentric with the rotary axis (40) of the output gear (36), said recess having arranged therein a helical spring (44) of which the first leg is in abutment on the transmission housing portion (6) and of which the second leg (46) is in abutment on the output gear (36), such that, upon rotation of the output gear (36) from the closed position of the valve device, energy for turning the output gear (36) back into the starting position is stored in the helical spring (44). - The valve device for an internal combustion engine according to any one of claims 9 to 12,
characterized in that,
the transmission housing portion (6) comprises a lead frame (92) injection-molded into it, said lead frame comprising connection pins (96) of a plug (94) formed on the transmission housing portion (6), of a sensor (90) and of the drive unit (16). - The valve device for an internal combustion engine according to any one of the preceding claims,
characterized in that
the valve rod (68) is guided, via a guiding element (70), for translatory movement in the housing (2) and that a sealing element (72) is arranged on the valve rod (68) between the guiding element (70) and the coupling element (66). - The valve device for an internal combustion engine according to any one of claims 9 to 14,
characterized in that,
the transmission housing portion (6) is formed with a contour (96) serving for guiding the coupling element (66).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009056251.6A DE102009056251B4 (en) | 2009-12-01 | 2009-12-01 | Valve device for an internal combustion engine |
PCT/EP2010/068019 WO2011067138A1 (en) | 2009-12-01 | 2010-11-23 | Valve device for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
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EP2507498A1 EP2507498A1 (en) | 2012-10-10 |
EP2507498B1 true EP2507498B1 (en) | 2013-09-25 |
Family
ID=43599176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10781694.4A Active EP2507498B1 (en) | 2009-12-01 | 2010-11-23 | Valve arrangement for internal combustion engine |
Country Status (5)
Country | Link |
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US (1) | US9016266B2 (en) |
EP (1) | EP2507498B1 (en) |
DE (1) | DE102009056251B4 (en) |
ES (1) | ES2440772T3 (en) |
WO (1) | WO2011067138A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102011004018A1 (en) * | 2011-02-14 | 2012-08-16 | Robert Bosch Gmbh | Actuator, flow valve, exhaust gas turbocharger |
DE102014106517A1 (en) | 2014-05-09 | 2015-11-12 | Pierburg Gmbh | Exhaust gas turbocharger with a wastegate valve |
DE102014106515A1 (en) | 2014-05-09 | 2015-11-12 | Pierburg Gmbh | Exhaust gas turbocharger with a wastegate valve |
DE102014106513A1 (en) | 2014-05-09 | 2015-11-12 | Pierburg Gmbh | Exhaust gas turbocharger with a wastegate valve |
FR3021819B1 (en) | 2014-06-03 | 2016-06-03 | Mmt Sa | LINEAR REVERSIBLE LINEAR ACTUATOR WITH BIFILAR CONTROL |
KR101704495B1 (en) * | 2015-09-17 | 2017-02-08 | 주식회사 현대케피코 | Electronic EGR Valve Having a Housing Which Integrally Comprises a Motor Chamber, a Valve Chamber, and a Gear chamber Having Structure of Both Side Support |
FR3079983B1 (en) | 2018-04-09 | 2020-04-10 | Moving Magnet Technologies | METHOD FOR CONTROLLING A POLYPHASE MOTOR |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US5937835A (en) * | 1997-06-24 | 1999-08-17 | Eaton Corporation | EGR system and improved actuator therefor |
US6443135B1 (en) * | 1999-10-05 | 2002-09-03 | Pierburg Aktiengesellschaft | Assembly of a valve unit, a combustion air intake and an exhaust gas recirculation unit for an internal combustion engine |
DE50006131D1 (en) | 1999-10-05 | 2004-05-27 | Pierburg Gmbh | Valve unit, combustion air intake duct section and exhaust gas recirculation unit for internal combustion engines |
DE10221711A1 (en) * | 2002-05-16 | 2003-11-27 | Pierburg Gmbh | valve system |
DE102006009153A1 (en) | 2006-02-24 | 2007-08-30 | Mahle International Gmbh | Exhaust gas recirculation device |
DE102006031028A1 (en) * | 2006-07-05 | 2008-01-10 | Gustav Wahler Gmbh U. Co. Kg | Valve e.g. exhaust gas reconducting valve, operating device for internal combustion engine, has drive motor and eccentric drive for lifting operation of actuator with valve unit, and driven drive unit that is in connection with rotary drive |
ES2333246T3 (en) * | 2006-07-06 | 2010-02-18 | Cooper-Standard Automotive (Deutschland) Gmbh | EXHAUST GAS RETURN VALVE. |
FR2926114B1 (en) * | 2008-01-03 | 2012-12-14 | Valeo Sys Controle Moteur Sas | EGR LOOP OF AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE |
-
2009
- 2009-12-01 DE DE102009056251.6A patent/DE102009056251B4/en active Active
-
2010
- 2010-11-23 ES ES10781694.4T patent/ES2440772T3/en active Active
- 2010-11-23 WO PCT/EP2010/068019 patent/WO2011067138A1/en active Application Filing
- 2010-11-23 EP EP10781694.4A patent/EP2507498B1/en active Active
- 2010-11-23 US US13/511,373 patent/US9016266B2/en active Active
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EP2507498A1 (en) | 2012-10-10 |
US20120285411A1 (en) | 2012-11-15 |
US9016266B2 (en) | 2015-04-28 |
ES2440772T3 (en) | 2014-01-30 |
DE102009056251A1 (en) | 2011-06-09 |
DE102009056251B4 (en) | 2014-01-09 |
WO2011067138A1 (en) | 2011-06-09 |
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