EP2630344B1 - Mechanically controllable valve drive - Google Patents

Mechanically controllable valve drive Download PDF

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Publication number
EP2630344B1
EP2630344B1 EP11749434.4A EP11749434A EP2630344B1 EP 2630344 B1 EP2630344 B1 EP 2630344B1 EP 11749434 A EP11749434 A EP 11749434A EP 2630344 B1 EP2630344 B1 EP 2630344B1
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EP
European Patent Office
Prior art keywords
valve drive
recited
mechanically controllable
controllable valve
roller
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EP11749434.4A
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German (de)
French (fr)
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EP2630344A1 (en
Inventor
Rudolf Flierl
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Kolbenschmidt Pierburg Innovations GmbH
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Kolbenschmidt Pierburg Innovations GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot

Definitions

  • the invention relates to a mechanically controllable valve train with a gas exchange valve, which acts on a pivot lever assembly by means of an end face, wherein adjusting means are provided for valve lash adjustment, wherein the pivot lever assembly is movably mounted in the cylinder head by means of bearing means and wherein the pivot lever assembly having a role with a working curve with a rocker arm of a Ventilhubverstell till is in operative connection. Furthermore, the invention relates to a mechanically controllable valve train arrangement.
  • Such mechanically controllable valve trains are well known.
  • a mechanically controllable valve train is known in which a rocker arm is designed such that it is movable with its one end by means of a roller through a camshaft in a link arrangement and acts with its other end via a working curve via a pivot lever together such that the gas exchange valve open and closed.
  • a second roller is arranged in such a valve drive, which cooperates with an adjustable bar such that a valve lift is made possible.
  • spring means which bias the rocker arm in the direction of the adjustable bar.
  • This Hubverstellan eleven also has a rocker arm, which cooperates via a working curve with a pivot lever and this pivot lever with a gas exchange valve. However, the adjustment of the rocker arm and thus the adjustment of the lifting height takes place here at the opposite end of the working curve of the rocker arm.
  • the Camshaft engages on a roller which is mounted approximately in the middle of the rocker arm.
  • valve trains are equipped with a valve clearance, which is intended to ensure a closed valve over a specific driving cycle.
  • Newer engines have so-called hydraulic tappets, which no longer require valve clearance, and which ensure that the valve train can adapt to the respective operating and wearing conditions.
  • This type of hydraulic tappet are used in combination with a ball head, on which the pivot lever is mounted, also in the valve drives with a Hubverstellan nie.
  • a spring member (42) which acts on the rocker arm (18), wherein between the rocker arm (18) and the roller (12) of the pivot lever assembly (6) a valve lash (22) is provided, wherein the working curve (28) has two curve areas, which ensure a valve clearance (22), wherein a curve region is assigned to a cold operating state and a curved region to a heated state of an internal combustion engine.
  • the wear of the Ventilhubverstell is minimized by the fact that there is no more friction in the base circle contact of the cam of the camshaft.
  • the working curve has two different curve areas, such as for full stroke, partial lift, idle and of course for the valve clearance.
  • a particularly advantageous embodiment of a mechanically controllable valve drive is provided in that the valve lift is executed such that the rocker arm is movable with a roller through a camshaft in a link arrangement and is adjustable by means of an adjusting member, wherein the side facing the pivot lever has a working curve, which is in operative connection with the roller, wherein the rocker arm is biased by means of a spring member.
  • the rocker arm is L-shaped with a working cam leg and a guide leg and wherein the spring member is designed such that it has at least one spring force component in the direction of the guide leg.
  • the spring member engages the working cam leg.
  • the bearing means consist of a pivot bearing arranged on a pivot bearing.
  • the adjusting means may advantageously be provided between the gas exchange valve and the end face.
  • the adjusting means can be designed as a thick stepped shims, with which an extremely precise adjustment of the valve stem is made possible. Also, a simple readjustment is guaranteed in certain maintenance intervals.
  • the adjusting means for the valve clearance can be provided in the pivot bearing, the adjustment can be made solely by this or in addition to the shims used. In order to take account of extreme wear, for example of the valve seat, and also to provide the possibility of readjusting the engagement of the rocker arm with the valve lift adjusting device during maintenance intervals, it may also be advantageous if the adjusting means are provided in the valve lift adjustment device.
  • the pivot lever assembly consists of a pivot lever and a rotatably mounted therein roller, wherein the roller is in operative connection with the working curve of the rocker arm. It can be provided as adjusting the pivot lever assembly. In this case, a clearance adjustment can be made via a simple classification of individual pivot lever assemblies. It is also conceivable that the role of the pivot lever assembly is provided as adjusting.
  • the adjusting means can then be formed by the adjusting member. It is also conceivable, of course, the adjusting means are formed by the working curve of the rocker arm.
  • valve clearance depending on the temperature between the working curve and the role of a rotation of the adjusting be adjustable.
  • the adjusting means are formed by the slide arrangement.
  • a particularly advantageous embodiment of a valve train assembly is provided in that the rocker arms of adjacent valve trains have guide rollers which guide the rocker arm in a link arrangement and wherein the guide rollers are connected by two adjacent rocker arms via a plug-in axis, wherein between the guide rollers a roller is arranged on which attacks the camshaft.
  • a mechanically controllable valve train 2 is shown with a partially shown gas exchange valve 4 of an internal combustion engine not shown in detail.
  • the gas exchange valve 4 is shown by way of example for a plurality of identical intake valves of a cylinder of the internal combustion engine.
  • On the illustrated valve stem of the gas exchange valve 4 engages in a known manner a pivot lever assembly 6 with an end face 9, so that the gas exchange valve 4 is opened or closed in response to a camshaft 10.
  • the pivot lever assembly 6 consists essentially of a pivot lever 8 and a rotatable therein mounted roller 12.
  • the pivot lever 8 is also mounted via a pivot bearing 14 on a pivot axis 16.
  • the roller 12 and thus the pivot lever assembly 6 is in known manner in operative connection with a rocker arm 18 and a Ventilhubverstell listening 20.
  • the rocker arm 18 is formed substantially L-shaped, wherein the rocker arm 18 has a guide leg 24, and a working cam 26 with a directed to the pivot lever assembly 8 working curve 28.
  • the Ventilhubverstell listening 20 is guided in a known manner by means of a guide roller 30 in a link arrangement 32.
  • explicit reference is made to the DE 101 40 635 A1 referenced, in which the structure of an advantageous valve train assembly is described.
  • the rocker arms of adjacent valve trains are connected by a plug-in axis, which has a roller on which a camshaft 10 engages with the corresponding cam 34 and triggers the corresponding valve lift of the gas exchange valves.
  • a valve lift is achieved by the use of an adjusting member 36 via an eccentric member 38 which engages on a further roller 40 of the rocker arm 18.
  • a certain valve lift height of the gas exchange valve 4 is achieved upon rotation of the camshaft 10.
  • a spring member 42 is provided which has both a spring force component Fx in the direction of the adjusting member 36 and a spring force component Fy in the direction of the guide leg 24.
  • the assembly of the illustrated Ventilhubvoriques is substantially simplified because in the initial state, caused by the spring member 42, a contact between the adjusting member 36 and the roller 40, between the roller 30 and the link assembly 32 and between the roller 30 and the camshaft 10 is present.
  • the pivot lever assembly 6 To adjust the game can now be raised in the present embodiment, the pivot lever assembly 6 until it reaches the working curve 28 of the working cam leg 26 to the plant. Subsequently, the distance between the valve stem of the gas exchange valve 4 and the end face 9 of the pivot lever assembly 6 is measured.
  • a corresponding shim 44 can be selected, whose thickness corresponds to the distance between the end face 9 and the valve stem of the gas exchange valve 4 together with the desired game.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

Die Erfindung betrifft einen mechanisch steuerbaren Ventiltrieb mit einem Gaswechselventil, auf das eine Schwenkhebelanordnung mittels einer Stirnfläche angreift, wobei Einstellmittel zur Ventilspieleinstellung vorgesehen sind, wobei die Schwenkhebelanordnung im Zylinderkopf mittels Lagermittel beweglich gelagert ist und wobei die Schwenkhebelanordnung eine Rolle aufweist, die über eine Arbeitskurve mit einem Kipphebel einer Ventilhubverstelleinrichtung in Wirkverbindung steht. Desweiteren betrifft die Erfindung eine mechanisch steuerbare Ventiltriebanordnung.The invention relates to a mechanically controllable valve train with a gas exchange valve, which acts on a pivot lever assembly by means of an end face, wherein adjusting means are provided for valve lash adjustment, wherein the pivot lever assembly is movably mounted in the cylinder head by means of bearing means and wherein the pivot lever assembly having a role with a working curve with a rocker arm of a Ventilhubverstelleinrichtung is in operative connection. Furthermore, the invention relates to a mechanically controllable valve train arrangement.

Derartige mechanisch steuerbare Ventiltriebe sind hinlänglich bekannt. So ist beispielsweise aus der DE 10140635 A1 ein mechanisch steuerbarer Ventiltrieb bekannt, bei dem ein Kipphebel derart ausgeführt ist, dass er mit seinem einen Ende mittels einer Rolle durch eine Nockenwelle in einer Kulissenanordnung bewegbar ist und mit seinem anderen Ende über eine Arbeitskurve über einen Schwenkhebel derart zusammen wirkt, dass das Gaswechselventil geöffnet und geschlossen wird. Zwischen der ersten Rolle und der Arbeitskurve ist bei einem derartigen Ventiltrieb eine zweite Rolle angeordnet, die mit einer verstellbaren Leiste derart zusammenwirkt, dass eine Ventilhubverstellung ermöglicht wird. Hierbei sind desweiteren Federmittel vorgesehen, die den Kipphebel in Richtung der verstellbaren Leiste vorspannen. Aus der DE 4326331 A1 ist ebenfalls ein Ventiltrieb mit einer Hubverstellanordnung bekannt. Auch diese Hubverstellanordnung weist einen Kipphebel auf, der über eine Arbeitskurve mit einem Schwenkhebel und über diesen Schwenkhebel mit einem Gaswechselventil zusammenwirkt. Die Verstellung des Kipphebels und damit die Einstellung der Hubhöhe findet jedoch hierbei am von der Arbeitskurve entgegengesetzten Ende des Kipphebels statt. Die Nockenwelle greift auf eine Rolle an, die ungefähr in der Mitte des Kipphebels gelagert ist.Such mechanically controllable valve trains are well known. For example, from the DE 10140635 A1 a mechanically controllable valve train is known in which a rocker arm is designed such that it is movable with its one end by means of a roller through a camshaft in a link arrangement and acts with its other end via a working curve via a pivot lever together such that the gas exchange valve open and closed. Between the first roller and the working curve, a second roller is arranged in such a valve drive, which cooperates with an adjustable bar such that a valve lift is made possible. Here are further provided spring means which bias the rocker arm in the direction of the adjustable bar. From the DE 4326331 A1 is also a valve train with a Hubverstellanordnung known. This Hubverstellanordnung also has a rocker arm, which cooperates via a working curve with a pivot lever and this pivot lever with a gas exchange valve. However, the adjustment of the rocker arm and thus the adjustment of the lifting height takes place here at the opposite end of the working curve of the rocker arm. The Camshaft engages on a roller which is mounted approximately in the middle of the rocker arm.

Um Verschleißerscheinungen des Ventilsitzes und den unterschiedlichen Betriebszuständen bei unterschiedlichen Temperaturen Rechnung zu tragen, sind Ventiltriebe mit einem Ventilspiel ausgestattet, das ein geschlossenes Ventil über einen bestimmten Fahrzyklus gewährleisten soll. Neuere Motoren haben sogenannte Hydrostößel, die kein Ventilspiel mehr benötigen, und die gewährleisten, dass sich der Ventiltrieb den jeweiligen Betriebs- und Verschleißzuständen anpassen kann. Diese Art von Hydrostößel werden in Kombination mit einem Kugelkopf, auf dem der Schwenkhebel gelagert ist, auch bei den Ventiltrieben mit einer Hubverstellanordnung eingesetzt. Wenngleich hierdurch eine einwandfreie Schließung des Gaswechselventils gewährleistet ist, führen derartige Maßnahmen im Lebenszyklus des Verbrennungsmotors dazu, dass sich der Angriffspunkt der Arbeitskurve der Hubverstellanordnung auf die Rolle des Schwenkhebels verändert. Dies führt wiederum dazu, dass die bestimmten Betriebszuständen zugeordnete Ventilhubverstellung nicht mehr präzise arbeitet, was sich insbesondere vor dem Hintergrund einer optimalen Verbrennung und den damit verbundenen niedrigen Emissionen als nachteilig erweist.In order to take into account wear phenomena of the valve seat and the different operating states at different temperatures, valve trains are equipped with a valve clearance, which is intended to ensure a closed valve over a specific driving cycle. Newer engines have so-called hydraulic tappets, which no longer require valve clearance, and which ensure that the valve train can adapt to the respective operating and wearing conditions. This type of hydraulic tappet are used in combination with a ball head, on which the pivot lever is mounted, also in the valve drives with a Hubverstellanordnung. Although this ensures proper closure of the gas exchange valve, such measures in the life cycle of the internal combustion engine cause the point of application of the working curve of the Hubverstellanordnung changed to the role of the pivot lever. This in turn means that the specific operating conditions associated valve lift adjustment no longer works precisely, which proves to be particularly in the light of optimal combustion and the associated low emissions as disadvantageous.

Auch die DE 101 23 186 A1 , die EP 1 666 702 A1 und die JP 2005-320887 offenbaren gattungsgemäße mechanisch steuerbare Ventiltriebe, die die oben genannten Nachteile aufweisen.Also the DE 101 23 186 A1 , the EP 1 666 702 A1 and the JP 2005-320887 disclose generic mechanically controllable valve trains, which have the above-mentioned disadvantages.

Es stellt sich daher die Aufgabe, einen mechanisch steuerbaren Ventiltrieb zu schaffen, der die oben genannten Nachteile vermeidet.It is therefore the object to provide a mechanically controllable valve train, which avoids the disadvantages mentioned above.

Diese Aufgabe wird dadurch gelöst, dass ein Federorgan (42) vorgesehen ist, das auf den Kipphebel (18) angreift, wobei zwischen dem Kipphebel (18) und der Rolle (12) der Schwenkhebelanordnung (6) ein Ventilspiel (22) vorgesehen ist, wobei die Arbeitskurve (28) zwei Kurvenbereiche aufweist, die ein Ventilspiel (22) gewährleisten, wobei ein Kurvenbereich einem kalten Betriebszustand und ein Kurvenbereich einem erwärmten Zustand einer Brennkraftmaschine zuzuordnen ist. Durch einen derartigen Ventiltrieb ist es möglich, eine optimale Verbrennung bei unterschiedlichsten Betriebszuständen dadurch zu gewährleisten, dass der Ventiltrieb in bestimmten Abständen, beispielsweise Wartungsintervallen immer wieder neu justiert werden kann. Desweiteren wird der Verschleiß der Ventilhubverstelleinrichtung dadurch minimiert, dass im Grundkreiskontakt des Nockens der Nockenwelle keine Reibung mehr vorliegt. Hierbei weist die Arbeitskurve zwei unterschiedliche Kurvenbereiche, wie zum Beispiel für Vollhub, Teilhub, Leerlauf und natürlich für das Ventilspiel auf.This object is achieved in that a spring member (42) is provided which acts on the rocker arm (18), wherein between the rocker arm (18) and the roller (12) of the pivot lever assembly (6) a valve lash (22) is provided, wherein the working curve (28) has two curve areas, which ensure a valve clearance (22), wherein a curve region is assigned to a cold operating state and a curved region to a heated state of an internal combustion engine. By means of such a valvetrain, it is possible to ensure optimal combustion in the most diverse operating states by virtue of the fact that the valve drive can be readjusted again and again at specific intervals, for example maintenance intervals. Furthermore, the wear of the Ventilhubverstelleinrichtung is minimized by the fact that there is no more friction in the base circle contact of the cam of the camshaft. Here, the working curve has two different curve areas, such as for full stroke, partial lift, idle and of course for the valve clearance.

Eine besonders vorteilhafte Ausführungsform eines mechanisch steuerbaren Ventiltriebes wird dadurch geschaffen, dass die Ventilhubverstelleinrichtung derart ausgeführt ist, dass der Kipphebel mit einer Rolle durch eine Nockenwelle in einer Kulissenanordnung bewegbar ist und mittels einem Verstellorgan verstellbar ist, wobei die zum Schwenkhebel gerichtete Seite eine Arbeitskurve aufweist, die mit der Rolle in Wirkverbindung steht, wobei der Kipphebel mittels eines Federorgans unter Vorspannung steht.A particularly advantageous embodiment of a mechanically controllable valve drive is provided in that the valve lift is executed such that the rocker arm is movable with a roller through a camshaft in a link arrangement and is adjustable by means of an adjusting member, wherein the side facing the pivot lever has a working curve, which is in operative connection with the roller, wherein the rocker arm is biased by means of a spring member.

Es hat sich als vorteilhaft erwiesen, dass der Kipphebel L-förmig mit einem Arbeitskurvenschenkel und einem Führungsschenkel ausgebildet ist und wobei das Federorgan derart ausgeführt ist, dass es zumindest eine Federkraftkomponente in Richtung des Führungsschenkels aufweist. In einer besonders vorteilhaften Ausführungsform greift das Federorgan auf den Arbeitskurvenschenkel an.It has proved to be advantageous that the rocker arm is L-shaped with a working cam leg and a guide leg and wherein the spring member is designed such that it has at least one spring force component in the direction of the guide leg. In a particularly advantageous embodiment, the spring member engages the working cam leg.

Um einen Ventiltrieb zu schaffen, der auch bei höchsten Drehzahlen, wie z. B. bei Motorrädern eingesetzt werden kann und der damit auch für höchste spezifische Zylinderleistungen mit hohen Ventilbeschleunigungen ausgelegt ist, ist es vorteilhaft, dass die Lagermittel aus einem auf einer Schwenkachse angeordneten Schwenklager bestehen. Durch eine derartige Lagerung können die hohen Federkräfte, die bei einer derartigen Anwendung entstehen, sicher aufgefangen werden.To create a valve train, which is also at high speeds, such. B. can be used in motorcycles and thus also for highest specific cylinder power is designed with high valve accelerations, it is advantageous that the bearing means consist of a pivot bearing arranged on a pivot bearing. By such storage, the high spring forces that arise in such an application can be safely collected.

Die Einstellmittel können vorteilhafterweise zwischen dem Gaswechselventil und der Stirnfläche vorgesehen sein. Hierzu können die Einstellmittel als dickengestufte Einstellscheiben ausgeführt sein, mit denen eine extrem präzise Einstellung des Ventilstiels ermöglicht wird. Auch ist eine einfache Nachjustage in bestimmten Wartungsintervallen hierdurch gewährleistet. Auch können die Einstellmittel für das Ventilspiel im Schwenklager vorgesehen sein, wobei die Einstellung alleinig hierdurch oder zusätzlich zu den eingesetzten Einstellscheiben vorgenommen werden kann. Um einem extremen Verschleiß, beispielsweise des Ventilsitzes, Rechnung zu tragen und auch die Möglichkeit vorzusehen, den Eingriff des Kipphebels mit der Ventilhubverstelleinrichtung in Wartungsintervallen nachzujustieren, kann es darüber hinaus vorteilhaft sein, wenn die Einstellmittel in der Ventilhubverstelleinrichtung vorgesehen sind.The adjusting means may advantageously be provided between the gas exchange valve and the end face. For this purpose, the adjusting means can be designed as a thick stepped shims, with which an extremely precise adjustment of the valve stem is made possible. Also, a simple readjustment is guaranteed in certain maintenance intervals. Also, the adjusting means for the valve clearance can be provided in the pivot bearing, the adjustment can be made solely by this or in addition to the shims used. In order to take account of extreme wear, for example of the valve seat, and also to provide the possibility of readjusting the engagement of the rocker arm with the valve lift adjusting device during maintenance intervals, it may also be advantageous if the adjusting means are provided in the valve lift adjustment device.

In vorteilhafter Weise besteht die Schwenkhebelanordnung aus einem Schwenkhebel und einer darin drehbar gelagerten Rolle, wobei die Rolle in Wirkverbindung mit der Arbeitskurve des Kipphebels steht. Dabei kann als Einstellmittel die Schwenkhebelanordnung vorgesehen sein. In diesem Fall kann über eine einfache Klassifizierung von einzelnen Schwenkhebelanordnungen eine Spieleinstellung erfolgen. Auch ist es denkbar, dass die Rolle der Schwenkhebelanordnung als Einstellmittel vorgesehen ist.Advantageously, the pivot lever assembly consists of a pivot lever and a rotatably mounted therein roller, wherein the roller is in operative connection with the working curve of the rocker arm. It can be provided as adjusting the pivot lever assembly. In this case, a clearance adjustment can be made via a simple classification of individual pivot lever assemblies. It is also conceivable that the role of the pivot lever assembly is provided as adjusting.

Bei einer weiteren Ausführungsform können dann die Einstellmittel durch das Verstellorgan ausgebildet sein. Auch ist es natürlich denkbar, die Einstellmittel durch die Arbeitskurve des Kipphebels ausgebildet sind.In a further embodiment, the adjusting means can then be formed by the adjusting member. It is also conceivable, of course, the adjusting means are formed by the working curve of the rocker arm.

In vorteilhafter Weise kann das Ventilspiel temperaturabhängig zwischen der Arbeitskurve und der Rolle über ein Verdrehen des Verstellorgans justierbar sein.Advantageously, the valve clearance depending on the temperature between the working curve and the role of a rotation of the adjusting be adjustable.

Auch ist es denkbar, dass die Einstellmittel durch die Kulissenanordnung ausgebildet sind.It is also conceivable that the adjusting means are formed by the slide arrangement.

Eine besonders vorteilhafte Ausführungsform einer Ventiltriebanordnung wird dadurch geschaffen, dass die Kipphebel benachbarter Ventiltriebe Führungsrollen aufweisen, die den Kipphebel in einer Kulissenanordnung führen und wobei die Führungsrollen von zwei benachbarten Kipphebeln über eine Steckachse miteinander verbunden sind, wobei zwischen den Führungsrollen eine Rolle angeordnet ist, auf die die Nockenwelle angreift.A particularly advantageous embodiment of a valve train assembly is provided in that the rocker arms of adjacent valve trains have guide rollers which guide the rocker arm in a link arrangement and wherein the guide rollers are connected by two adjacent rocker arms via a plug-in axis, wherein between the guide rollers a roller is arranged on which attacks the camshaft.

Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert, hierbei zeigt die einzige Figur eine schematische Schnittansicht eines erfindungsgemäßen mechanischen Ventiltriebes.The invention will be explained in more detail with reference to the drawing, in which case the single figure shows a schematic sectional view of a mechanical valve drive according to the invention.

In der Figur ist ein mechanisch steuerbarer Ventiltrieb 2 mit einem teilweise dargestellten Gaswechselventil 4 einer nicht näher gezeigten Brennkraftmaschine dargestellt. Das Gaswechselventil 4 ist beispielhaft gezeigt für mehrere, gleichartige Einlassventile eines Zylinders der Brennkraftmaschine. Auf den dargestellten Ventilschaft des Gaswechselventils 4 greift auf bekannte Weise eine Schwenkhebelanordnung 6 mit einer Stirnfläche 9 an, so dass das Gaswechselventil 4 in Abhängigkeit von einer Nockenwelle 10 geöffnet oder geschlossen wird. Die Schwenkhebelanordnung 6 besteht im Wesentlichen aus einem Schwenkhebel 8 und einer darin drehbar gelagerten Rolle 12. Der Schwenkhebel 8 ist darüber hinaus über ein Schwenklager 14 auf einer Schwenkachse 16 gelagert.In the figure, a mechanically controllable valve train 2 is shown with a partially shown gas exchange valve 4 of an internal combustion engine not shown in detail. The gas exchange valve 4 is shown by way of example for a plurality of identical intake valves of a cylinder of the internal combustion engine. On the illustrated valve stem of the gas exchange valve 4 engages in a known manner a pivot lever assembly 6 with an end face 9, so that the gas exchange valve 4 is opened or closed in response to a camshaft 10. The pivot lever assembly 6 consists essentially of a pivot lever 8 and a rotatable therein mounted roller 12. The pivot lever 8 is also mounted via a pivot bearing 14 on a pivot axis 16.

Die Rolle 12 und damit die Schwenkhebelanordnung 6 steht auf bekannte Weise in Wirkverbindung mit einem Kipphebel 18 und einer Ventilhubverstelleinrichtung 20. Im dargestellten Ausführungsbeispiel befindet sich der Kipphebel 18 in einer Ausgangsposition, die durch das geschlossene Gaswechselventil 4 (das heißt Ventilhub = 0) festgelegt ist. In dieser Ausgangsposition liegt ein vordefiniertes Spiel 22, zwischen der Rolle 12 der Schwenkhebelanordnung 8 und dem Kipphebel 18 vor.The roller 12 and thus the pivot lever assembly 6 is in known manner in operative connection with a rocker arm 18 and a Ventilhubverstelleinrichtung 20. In the illustrated embodiment, the rocker arm 18 is in a starting position, which is defined by the closed gas exchange valve 4 (that is valve = 0) , In this starting position is a predefined game 22, between the roller 12 of the pivot lever assembly 8 and the rocker arm 18 before.

Der Kipphebel 18 ist im Wesentlichen L-förmig ausgebildet, wobei der Kipphebel 18 einen Führungsschenkel 24, sowie einen Arbeitskurvenschenkel 26 mit einer zur Schwenkhebelanordnung 8 gerichteten Arbeitskurve 28 aufweist. Die Ventilhubverstelleinrichtung 20 ist dabei auf bekannte Weise mittels einer Führungsolle 30 in einer Kulissenanordnung 32 geführt. In diesem Zusammenhang wird explizit auf die DE 101 40 635 A1 verwiesen, in der der Aufbau einer vorteilhaften Ventiltriebanordnung beschrieben wird. Hierbei sind die Kipphebel benachbarter Ventiltriebe durch eine Steckachse verbunden, die eine Rolle aufweist, auf die eine Nockenwelle 10 mit den entsprechenden Nocken 34 angreift und den entsprechenden Ventilhub der Gaswechselventile auslöst.The rocker arm 18 is formed substantially L-shaped, wherein the rocker arm 18 has a guide leg 24, and a working cam 26 with a directed to the pivot lever assembly 8 working curve 28. The Ventilhubverstelleinrichtung 20 is guided in a known manner by means of a guide roller 30 in a link arrangement 32. In this context, explicit reference is made to the DE 101 40 635 A1 referenced, in which the structure of an advantageous valve train assembly is described. Here, the rocker arms of adjacent valve trains are connected by a plug-in axis, which has a roller on which a camshaft 10 engages with the corresponding cam 34 and triggers the corresponding valve lift of the gas exchange valves.

Eine Ventilhubverstellung wird durch den Einsatz eines Verstellorgans 36 über ein Exzenterorgan 38, der auf eine weitere Rolle 40 des Kipphebels 18 angreift. Abhängig vom Verstellwinkel ϕ des Verstellorgans wird eine bestimmte Ventilhubhöhe des Gaswechselventils 4 bei Drehung der Nockenwelle 10 erreicht.A valve lift is achieved by the use of an adjusting member 36 via an eccentric member 38 which engages on a further roller 40 of the rocker arm 18. Depending on the adjustment angle φ of the adjusting member, a certain valve lift height of the gas exchange valve 4 is achieved upon rotation of the camshaft 10.

Um den Kipphebel 18 gegenüber dem Verstellorgan 36 vorzuspannen und den Kipphebel 18 in der Ausgangsposition, das heißt kein Eingriff des Nockens 34 der Nockenwelle 10 und kein Eingriff des Exzenterorgans 38 des Verstellorgans 36 zu positionieren, ist ein Federorgan 42 vorgesehen, das sowohl eine Federkraftkomponente Fx in Richtung des Verstellorgans 36 als auch eine Federkraftkomponente Fy in Richtung des Führungsschenkels 24 aufweist.To bias the rocker arm 18 relative to the adjusting member 36 and the rocker arm 18 in the starting position, that is no engagement of the cam 34 of the camshaft 10 and no engagement of the eccentric 38th To position the adjusting member 36, a spring member 42 is provided which has both a spring force component Fx in the direction of the adjusting member 36 and a spring force component Fy in the direction of the guide leg 24.

Durch diese Anordnung wird darüberhinaus die Montage der dargestellten Ventilhubvorrichtung wesentlich vereinfacht, da im Ausgangszustand, hervorgerufen durch das Federorgan 42, ein Kontakt zwischen dem Verstellorgan 36 und der Rolle 40, zwischen der Rolle 30 und der Kulissenanordnung 32 und zwischen der Rolle 30 und der Nockenwelle 10 vorliegt. Zur Spieleinstellung kann nun im vorliegenden Ausführungsbeispiel die Schwenkhebelanordnung 6 angehoben werden bis diese an der Arbeitskurve 28 des Arbeitskurvenschenkels 26 zur Anlage gelangt. Nachfolgend wird der Abstand zwischen dem Ventilschaft des Gaswechselventils 4 und der Stirnfläche 9 der Schwenkhebelanordnung 6 gemessen. Nun kann eine entsprechende Einstellscheibe 44 (Shim) ausgewählt werden, deren Dicke zusammen mit dem gewünschten Spiel den Abstand zwischen der Stirnfläche 9 und dem Ventilschaft des Gaswechselventils 4 entspricht.By this arrangement, moreover, the assembly of the illustrated Ventilhubvorrichtung is substantially simplified because in the initial state, caused by the spring member 42, a contact between the adjusting member 36 and the roller 40, between the roller 30 and the link assembly 32 and between the roller 30 and the camshaft 10 is present. To adjust the game can now be raised in the present embodiment, the pivot lever assembly 6 until it reaches the working curve 28 of the working cam leg 26 to the plant. Subsequently, the distance between the valve stem of the gas exchange valve 4 and the end face 9 of the pivot lever assembly 6 is measured. Now, a corresponding shim 44 (Shim) can be selected, whose thickness corresponds to the distance between the end face 9 and the valve stem of the gas exchange valve 4 together with the desired game.

Es sollte deutlich sein, dass im Falle einer Ventiltriebanordnung mit zwei Kipphebeln, deren Führungsrollen über eine Steckachse miteinander verbunden sind, wobei auf der Steckachse eine weitere Rolle zwecks Zusammenwirken mit der Nockenwelle vorgesehen ist, die Positionierung der Ventiltriebanordnung dadurch gewährleistet ist, dass über die Krafteinleitung von Federorganen 42, die jeweils auf einen Kipphebel 18 der Ventiltriebanordnung wirken, ein Kontakt zwischen dem jeweiligen Verstellorgan 36 und der Rolle 40 eines Kipphebels 18, ein Kontakt zwischen den jeweiligen Führungsrollen und der Kulissenanordnung 32 und ein Kontakt zwischen der mittig auf der Steckachse gelagerten Rolle und der Nockenwelle 10 vorliegt.It should be clear that in the case of a valve train arrangement with two rocker arms, the guide rollers are connected to each other via a plug-in axis, wherein on the thru axle another role for the purpose of cooperation with the camshaft is provided, the positioning of the valve train assembly is ensured by the fact that on the introduction of force of spring members 42, each acting on a rocker arm 18 of the valve train assembly, a contact between the respective adjusting member 36 and the roller 40 of a rocker arm 18, a contact between the respective guide rollers and the link assembly 32 and a contact between the centrally mounted on the thru axle roller and the camshaft 10 is present.

Claims (17)

  1. A mechanically controllable valve drive (2) comprising a gas exchange valve (4) engaged by a pivot lever assembly (6) via an end surface (9), wherein adjustment device (12; 14; 20; 28; 32; 36; 44) are provided for adjusting the valve clearance (22), wherein the pivot lever assembly (6) is mounted in the cylinder head via bearing means so as to be movable, and wherein the pivot lever assembly (6) comprises a roller (12) that is operatively connected with a rocker lever (18) of a valve lift adjustment device (20) via a work curve (28), and wherein a spring member (42) is provided that engages the rocker lever (18), wherein a valve clearance (22) is provided between the rocker lever (18) and the roller (12) of the pivot lever assembly (6), characterized in that the work curve (28) has two curve portions that guarantee for a valve clearance (22), wherein one curve portion is assigned to a cold operational state and one cam portion is assigned to a warm operational state of an internal combustion engine.
  2. The mechanically controllable valve drive (2) as recited in claim 1, characterized in that the valve lift adjustment device (20) is configured so that the rocker arm (18) is movable in a sliding block assembly (32) by means of the roller via a camshaft (10) and is adjustable by means of an adjustment element (36), wherein a side facing the pivot lever (8) comprises a work curve (28) operatively connected to the roller (12), wherein, the rocker arm (18) is biased by the spring member (42).
  3. The mechanically controllable valve drive (2) as recited in claim 1 or 2, characterized in that the rocker arm (18) is configured as an L-shape comprising a work curve leg (26) and a guide leg (24), and wherein the spring member (42) is configured so as to have at least one spring force component in a direction of the guide leg (24).
  4. The mechanically controllable valve drive (2) as recited in claim 3, characterized in that the spring member (42) is configured to engage the work curve leg (26).
  5. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the bearing means of the pivot lever assembly (6) is a pivot bearing (14) arranged on a pivot axle (16).
  6. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the adjustment device is provided between the gas exchange valve (4) and the end surface (9).
  7. The mechanically controllable valve drive (2) as recited in claim 3, characterized in that the adjustment device is configured as adjustment disks (44) comprising a stepped thickness.
  8. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the adjustment device is arranged in the pivot bearing (14).
  9. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the adjustment device is provided in the valve lift adjustment device (20).
  10. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the pivot lever assembly (6) is formed by a pivot lever (8) and a roller (12) rotatably supported in the pivot lever, the roller (12) being configured so as to be operatively connected to the work curve of the rocker arm (18).
  11. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the adjustment device is the pivot lever assembly (6).
  12. The mechanically controllable valve drive (2) as recited in claim 11, characterized in that adjustment device is the roller (12) of the pivot lever assembly (6).
  13. The mechanically controllable valve drive (2) as recited in claim 2, characterized in that the adjustment device is formed by the adjustment member (36).
  14. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the adjustment device is formed by the work curve (28) of the rocker arm (18).
  15. The mechanically controllable valve drive (2) as recited in one of the preceding claims, characterized in that the valve clearance (22) is configured to be adjustable based on a temperature between the work curve (28) and the roller (12) by rotating the adjustment member (36).
  16. The mechanically controllable valve drive (2) as recited in claim 12, characterized in that the adjustment device is formed by the sliding block assembly (32).
  17. A mechanically controllable valve drive assembly comprising a plurality of gas exchange valves (4) arranged in a row and having corresponding cylinders assigned thereto, each gas exchange valve (4) having a respective mechanically controllable valve drive (2) of one of the preceding claims assigned thereto, characterized in that the rocker arms (18) comprises guide rollers, the guide rollers being configured to guide the rocker arm (18) in the sliding block assembly (32), and wherein the guide rollers of two adjacent rocker arms (18) being connected to each other via a stud axle, wherein a roller (30) is arranged between the guide rollers, the roller being configured to be engaged by the camshaft (10).
EP11749434.4A 2010-10-19 2011-08-31 Mechanically controllable valve drive Not-in-force EP2630344B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010048708A DE102010048708A1 (en) 2010-10-19 2010-10-19 Mechanically controllable valve train
PCT/EP2011/065048 WO2012052217A1 (en) 2010-10-19 2011-08-31 Mechanically controllable valve drive

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EP2630344A1 EP2630344A1 (en) 2013-08-28
EP2630344B1 true EP2630344B1 (en) 2015-10-14

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US (1) US20130220251A1 (en)
EP (1) EP2630344B1 (en)
JP (1) JP2013540235A (en)
KR (1) KR20130054439A (en)
CN (1) CN103168153A (en)
BR (1) BR112013005219A2 (en)
DE (1) DE102010048708A1 (en)
ES (1) ES2552067T3 (en)
WO (1) WO2012052217A1 (en)

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DE102010048708A1 (en) 2012-04-19
ES2552067T3 (en) 2015-11-25
EP2630344A1 (en) 2013-08-28
WO2012052217A1 (en) 2012-04-26
JP2013540235A (en) 2013-10-31
BR112013005219A2 (en) 2016-04-26
KR20130054439A (en) 2013-05-24
CN103168153A (en) 2013-06-19
US20130220251A1 (en) 2013-08-29

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