WO2009062586A1 - Valve driving device - Google Patents

Valve driving device Download PDF

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Publication number
WO2009062586A1
WO2009062586A1 PCT/EP2008/008842 EP2008008842W WO2009062586A1 WO 2009062586 A1 WO2009062586 A1 WO 2009062586A1 EP 2008008842 W EP2008008842 W EP 2008008842W WO 2009062586 A1 WO2009062586 A1 WO 2009062586A1
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WO
WIPO (PCT)
Prior art keywords
cam
drive device
valve drive
pairs
slide track
Prior art date
Application number
PCT/EP2008/008842
Other languages
German (de)
French (fr)
Inventor
Jens Meintschel
Thomas Stolk
Alexander Von Gaisberg-Helfenberg
Original Assignee
Daimler Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Ag filed Critical Daimler Ag
Publication of WO2009062586A1 publication Critical patent/WO2009062586A1/en

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Classifications

    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve

Definitions

  • the invention relates to a valve drive device according to the preamble of claim 1.
  • valve train devices in particular an internal combustion engine, with at least one cam element, which is axially displaceable by means of a shift gate and which is intended to provide a switchable valve train known.
  • the invention is in particular the object of providing a valve drive device with a low switching noise and low wear. It is achieved according to the invention by the features of the independent claims. Further embodiments emerge from the subclaims.
  • the invention relates to a valve drive device, in particular an internal combustion engine, with at least one cam element, which is axially displaceable by means of a shift gate and which is intended to provide a switchable valve train.
  • the cam element has at least three cam pairs, which are intended to valves to actuate at least three cylinders.
  • a switchable valve drive device with a low switching noise and low wear and a small number of actuators can be realized.
  • the pairs of cams are switched in sections.
  • sections is to be understood in particular as meaning that a switchover of the valve drive takes place in different and in particular in time-separable switching sections, whereby several pairs of cams can be switched simultaneously in one switching section
  • a plurality of pairs of cams are to be understood, whereby a “multiply executed pair of cams” is to be understood as meaning a plurality of equivalent pairs of cams arranged axially on the camming element for a plurality of gas exchange valves of a cylinder
  • An embodiment according to the invention with three pairs of cams on one cam element is particularly suitable for a V-type engine with two cylinder banks, each of which has three cylinders iron, advantageous.
  • Such an engine normally has two cam elements which are designed separately for the cylinder banks and, in the case of a valvetrain designed in accordance with the invention, each have three cam pairs, which can be embodied in duplicate.
  • the cam element is made in one piece, which in particular switching noises can be further reduced.
  • a cam element with several partial cam elements is conceivable, which are preferably fixedly coupled for axial movement.
  • the cam element has at least a fourth cam pair.
  • an internal combustion engine having only one cam member for a valve side, such as an intake side can be realized.
  • a cam element with four pairs of cams is particularly advantageous for an internal combustion engine designed as a four-cylinder in-line engine. Alternatively, however, such an arrangement can also be used for a four-cylinder V-engine per cylinder bank.
  • the shift gate has at least a first slide track with at least two adjustment segments, which is intended to move the cam member sections in a switching direction axially.
  • the adjustment segments are assigned to different cam pairs.
  • the cam pairs can be switched with a time delay.
  • the term "assignable” should be understood in particular to mean that a changeover in the corresponding cam pair takes place from one cam to the other by means of this adjustment segment.
  • the first adjustment segment is arranged at least partially in the angular range of a base circle phase of at least one cam pair, at least this one cam pair can be switched by means of the first adjustment segment.
  • the second adjusting segment is arranged at least partially in the angular range of a base circle phase of at least one further cam pair, at least this further cam pair can be switched by means of the second adjusting segment, whereby the two cam elements can be switched in sections.
  • the shift gate has at least a second slide track, which is intended to move the cam member axially in a further switching direction. This makes it easy to switch back to the first position.
  • a second slide track which is intended to move the cam member axially in a further switching direction. This makes it easy to switch back to the first position.
  • Any arrangement of the slide tracks on the cam element is possible. For example, it is possible to perform the slide tracks separately, while also several pairs of cams can lie between the slide tracks. Alternatively, the slide tracks but also directly adjacent or running as intersecting slide tracks.
  • the second slide track on at least two Verstellsegmente, which are arranged mirror-symmetrically to the adjustment segments of the first slide track.
  • a section-wise switching of the cam element in a second switching direction which is advantageously opposite to the switching direction of the first shift gate, can advantageously be achieved.
  • a valve drive device for an internal combustion engine is proposed with at least one cam pair axially displaceable cam pair with two adjacently arranged part cam, which is intended to realize an adjustable valve train in which the partial cams have a different axial width.
  • all cam pairs can be arranged on an axially displaceable cam element, and a selection, which pairs of pairs can be switched in sections by an axial displacement of the cam element can be achieved by an embodiment of the cam pairs, in particular by the arrangement of the wide part cam and the narrow part cam.
  • Such a design of the partial cams of a cam pair is particularly advantageous for a V-engine, since an arrangement of the widened partial cams can be adapted to the firing order of the cylinders, in particular in the different cylinder banks.
  • the axial width of the one sub-cam is approximately twice as large as the axial width of the second sub-cam. This can be achieved by an axial displacement, in particular by a value which corresponds to one third of an axial width of the entire pair of cams, that depending on an initial position, a circuit of the valve train takes place or not, which can be easily realized a partially switchable valve train.
  • the actual measurement deviates by less than 20% from the specified measure, advantageously deviates by less than 10%, preferably deviates by less than 5% and particularly preferably by less than 2% from the specified measure ,
  • FIG. 1 is a perspective view of a valve drive device according to the invention
  • Fig. 2 shows an embodiment of a first slide track of the valve drive device
  • Fig. 3 is a perspective view of the slide track.
  • Figure 1 shows a valve train device of an internal combustion engine, which is designed as a series four-cylinder engine.
  • the valve drive device has a cam element 16 arranged on a cam element 16, which is axially displaceable by means of a shift gate 14 and over which an adjustable valve train is realized.
  • the camshaft 35 only partially penetrates the cam element 16.
  • an introduction of force into the cam element 16 via a camshaft 35, which, for example, penetrates less than 25% of the cam element 16, is also possible.
  • the cam member 16 has four cam pairs 10, 11, 12, 13, each with two partial cams 27, 28, 29, 30, 31, 32, 33, 34.
  • the pairs of cams 10, 11, 12, 13 are each made in duplicate, with the double components in the following being designated by the letters a and b for differentiation in the figures. However, since the dual components are equal in function, the letter will be omitted in the following description, but with both components indicated a and b in the figures being equivalent to each other.
  • Each double cam pair is assigned to a cylinder of the internal combustion engine.
  • An axial width of the partial cams 27, 28, 29, 30, 31, 32, 33, 34 of a cam pair 10, 11, 12, 13 is different in size.
  • the first part cam 27, 29, 31, 33 in this case has an axial width which is about twice as large as the axial width of the second part cam 28, 30, 32, 34.
  • All cam pairs have a base circle phase 20, 21, 22, 23 and an opening phase 36, 37, 38, 39.
  • the cam pair 10, 11, 12, 13 associated gas exchange valve 15 is closed and the corresponding part cam 27, 28, 29, 30, 31, 32, 33, 34 of the cam pair 10, 11, 12, 13 is relieved.
  • the opening phase 36, 37, 38, 39 the cam pair 10, 11, 12, 13 associated gas exchange valve 15 is opened and the corresponding part cam 27, 28, 29, 30, 31, 32, 33, 34 of the cam pair 10, 11, 12, 13 is charged.
  • a partial cam can be configured such that the gas exchange valve remains closed over a whole angle range.
  • the shift gate 14, by means of which the cam member 10, 11, 12, 13 can be moved axially, has two slide tracks 17, 24.
  • the valve drive device has two actuators with actuating pins 40, 41, which can engage in the guide tracks 17, 24 and via which a force for adjusting the cam member 16, or the cam pairs 10, 11, 12, 13 is provided. Actuators for actuating the actuating pins 40, 41 are known in the art and therefore not shown here.
  • the cam member 16 is thereby switched in sections, wherein the cam pairs 10, 11 of the first two cylinders form a section and the cam pairs 12, 13 of the last two cylinders another section.
  • the cam member 16 can be moved axially in a first switching direction.
  • the first slide track 17 has two adjustment segments 18, 19, which can be assigned to the different cam pairs 10, 11, 12, 13.
  • the adjusting segments 18, 19 are connected via an intermediate segment 42.
  • a Einspursegment 43 is arranged at the end of the slide track a Ausspursegment 44.
  • the slide track 17 with the Einspursegment 43, the first adjustment segment 18, the intermediate segment 42, the second adjustment segment 19 and the Ausspursegment 44 has an angular extent of about 630 °, ie it runs about VH times around the cam member 16 around.
  • the first adjustment segment 18, by means of which the cam member 16 is moved from a first switching position to a middle position, the cam pairs 10, 11 of the first two cylinders can be assigned.
  • the gas exchange valves of the first two cylinders are opened by the narrow partial cams 30, 32 of the corresponding cam pairs 10, 11 (compare FIG.
  • the gas exchange valves 15 of the last two cylinders are actuated in the first switching position by the wide part cam 31, 33 of the corresponding cam pairs 12, 13.
  • the first adjustment segment 18 is arranged in an angular range, which is the Grund Vietnamesephasen 20, 21 of the cam pairs 10, 11 of the first two cylinders assigned.
  • the cam pairs 10, 11 are moved from the first switching position to the middle position.
  • the gas exchange valves 15 of the first two cylinders on the wide part cam 27, 29 of the corresponding cam pairs 10, 11 actuated.
  • the gas exchange valves 15 of the two last cylinders are also opened in the intermediate position by the wide part cam 31, 33 of the corresponding cam pairs 12, 13. In this pair of cams 12, 13 was moved by the first adjustment segment 18 only under load, a position of cam followers 45 on the corresponding part cam 31, 33.
  • the second adjustment segment 19 of the first slide track 17 can be assigned to the cam pairs 12, 13 of the last two cylinders.
  • the second adjustment segment 19 displaces the cam element 16 from the middle position into a second switching position.
  • the second adjustment segment 19 is in an angular range, the base circle phases 22, 23 of the cam pairs 12, 13 of the last two cylinders can be assigned arranged.
  • the second adjustment segment 19 is in the cam pairs 12, 13 of the last two cylinders of the wide part cam 31, 33 of the corresponding pairs of cams 12, 13 changed to the narrow part cam 32, 34, wherein the cam pairs 12, 13 thereby in the base circle phase 22nd , 23 are located and thus relieved.
  • the cam pairs 10, 11 of the first two cylinders only one position of the cam followers 45 is displaced by the second adjusting segment 19 onto the corresponding, wide partial cams 27, 29, whereby they are loaded.
  • the gas exchange valves 15 of the first two cylinders are then actuated by the wide part cam 27, 29 of the corresponding cam pairs 10, 11.
  • the gas exchange valves 15 of the last two cylinders are through the narrow part cam 32, 34 of the corresponding cam pairs 12, 13 is actuated.
  • the second slide track 24 is constructed mirror-symmetrically to the first slide track 17.
  • the cam member 16 in a second switching direction which is directed opposite to the first switching direction, are moved. It also has two adjustment segments 25, 26.
  • the cam member 16 is moved from the second switching position to the intermediate position.
  • the cam member 16 is moved from the intermediate position to the first switching position.
  • the two slide tracks 17, 24 are executed separately.
  • the first slide track 17 is arranged between the cam pairs 10, 11 of the first two cylinders.
  • the second slide track 24 is arranged between the cam pairs 12, 13 of the last two cylinders. In principle, however, another arrangement of the slide tracks 17, 24 is possible.

Abstract

The invention relates to a valve driving device, especially for an internal combustion engine, comprising at least three pairs of cams (10, 11, 12, 13) which can be axially moved one section at a time by means of a switching gate (14) and are used for designing a switchable valve drive for gas exchange valves (15) of at least three cylinders. According to the invention, the pairs of cams (10, 11, 12, 13) are arranged on a monolithic cam element (16).

Description

Ventiltriebvorrichtung Valve drive device
Die Erfindung betrifft eine Ventiltriebvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a valve drive device according to the preamble of claim 1.
Es sind bereits Ventiltriebvorrichtungen, insbesondere einer Brennkraftmaschine, mit zumindest einem Nockenelement, das mittels einer Schaltkulisse axial verschiebbar ist und das dazu vorgesehen ist, einen schaltbaren Ventiltrieb bereitzustellen, bekannt.There are already valve train devices, in particular an internal combustion engine, with at least one cam element, which is axially displaceable by means of a shift gate and which is intended to provide a switchable valve train known.
Der Erfindung liegt insbesondere die Aufgabe zugrunde, eine Ventiltriebvorrichtung mit einem geringen Schaltgerausch und einem geringen Verschleiß bereitzustellen. Sie wird gemäß der Erfindung durch die Merkmale der unabhängigen Patentansprüche gelost. Weitere Ausgestaltungen ergeben sich aus den Unteran- spruchen.The invention is in particular the object of providing a valve drive device with a low switching noise and low wear. It is achieved according to the invention by the features of the independent claims. Further embodiments emerge from the subclaims.
Die Erfindung geht aus von einer Ventiltriebvorrichtung, insbesondere einer Brennkraftmaschine, mit zumindest einem Nockenelement, das mittels einer Schaltkulisse axial verschiebbar ist und das dazu vorgesehen ist, einen schaltbaren Ventiltrieb bereitzustellen.The invention relates to a valve drive device, in particular an internal combustion engine, with at least one cam element, which is axially displaceable by means of a shift gate and which is intended to provide a switchable valve train.
Es wird vorgeschlagen, dass das Nockenelement zumindest drei Nockenpaare aufweist, die dazu vorgesehen sind, Gaswechsel- ventile zumindest dreier Zylinder zu betätigen. Dadurch kann eine schaltbare Ventiltriebvorrichtung mit einem geringen Schaltgeräusch und einem geringen Verschleiß sowie einer geringen Anzahl von Aktuatoren realisiert werden. Vorzugsweise werden die Nockenpaare abschnittsweise geschaltet. Unter „abschnittsweise" soll dabei insbesondere verstanden werden, dass eine Umschaltung des Ventiltriebs in verschiedenen und insbesondere in zeitlich trennbaren Schaltabschnitten verläuft, wobei dabei auch mehrere Nockenpaare gleichzeitig in einem Schaltabschnitt geschaltet werden können. Unter einem „Nockenpaar" sollen in diesem Zusammenhang insbesondere einfach wie auch mehrfach ausgeführte Nockenpaare verstanden werden, wobei unter einem „mehrfach ausgeführten Nockenpaar" mehrere äquivalente, axial auf dem Nockenelement versetzt angeordnete Nockenpaare für mehrere Gaswechselventile eines Zylinders verstanden werden soll. Mehrfach ausgeführte Nockenpaare, insbesondere doppelt ausgeführte Nockenpaare, werden beispielsweise bei Brennkraftmaschinen mit einer sogenannten Vier-Ventiltechnik verwendet. Eine erfindungsgemäße Ausführung mit drei Nockenpaaren auf einem Nockenelement ist insbesondere für einen V-Motor mit zwei Zylinderbänken, die jeweils drei Zylinder aufweisen, vorteilhaft. Ein solcher Motor weist normalerweise zwei für die Zylinderbänke getrennt ausgeführte Nockenelemente auf, die bei einem erfindungsgemäß ausgestalteten Ventiltrieb jeweils drei Nockenpaare, die doppelt ausgeführt sein können, aufweisen.It is proposed that the cam element has at least three cam pairs, which are intended to valves to actuate at least three cylinders. As a result, a switchable valve drive device with a low switching noise and low wear and a small number of actuators can be realized. Preferably, the pairs of cams are switched in sections. The term "sections" is to be understood in particular as meaning that a switchover of the valve drive takes place in different and in particular in time-separable switching sections, whereby several pairs of cams can be switched simultaneously in one switching section A plurality of pairs of cams are to be understood, whereby a "multiply executed pair of cams" is to be understood as meaning a plurality of equivalent pairs of cams arranged axially on the camming element for a plurality of gas exchange valves of a cylinder An embodiment according to the invention with three pairs of cams on one cam element is particularly suitable for a V-type engine with two cylinder banks, each of which has three cylinders iron, advantageous. Such an engine normally has two cam elements which are designed separately for the cylinder banks and, in the case of a valvetrain designed in accordance with the invention, each have three cam pairs, which can be embodied in duplicate.
Vorteilhafterweise ist das Nockenelement einstückig ausgeführt, wodurch insbesondere Schaltgeräusche weiter verringert werden können. Grundsätzlich ist aber auch ein Nockenelement mit mehreren Teilnockenelementen denkbar, die vorzugsweise für eine axiale Bewegung fest gekoppelt sind. Weiter wird vorgeschlagen, dass das Nockenelement zumindest ein viertes Nockenpaar aufweist. Dadurch kann eine Brennkraftmaschine mit lediglich einem Nockenelement für eine Ventilseite, wie beispielsweise einer Einlassseite, realisiert werden. Ein Nockenelement mit vier Nockenpaaren ist insbesondere für eine Brennkraftmaschine, die als ein Reihen- Vierzylindermotor ausgeführt ist, vorteilhaft. Alternativ kann eine solche Anordnung aber auch für einen V-Motor mit vier Zylindern je Zylinderbank verwendet werden.Advantageously, the cam element is made in one piece, which in particular switching noises can be further reduced. In principle, however, a cam element with several partial cam elements is conceivable, which are preferably fixedly coupled for axial movement. It is further proposed that the cam element has at least a fourth cam pair. Thereby, an internal combustion engine having only one cam member for a valve side, such as an intake side, can be realized. A cam element with four pairs of cams is particularly advantageous for an internal combustion engine designed as a four-cylinder in-line engine. Alternatively, however, such an arrangement can also be used for a four-cylinder V-engine per cylinder bank.
Ferner wird vorgeschlagen, dass die Schaltkulisse zumindest eine erste Kulissenbahn mit zumindest zwei Verstellsegmenten aufweist, die dazu vorgesehen ist, das Nockenelement abschnittsweise in eine Schaltrichtung axial zu verschieben. Dadurch kann vorteilhaft ein abschnittsweises Schalten des Nockenelements erreicht werden.It is also proposed that the shift gate has at least a first slide track with at least two adjustment segments, which is intended to move the cam member sections in a switching direction axially. As a result, advantageously a section-wise switching of the cam element can be achieved.
Vorzugsweise sind die Verstellsegmente unterschiedlichen Nockenpaaren zuordenbar. Dadurch können die Nockenpaare zeitversetzt geschaltet werden. Unter „zuordenbar" soll in diesem Zusammenhang insbesondere verstanden werden, dass eine Um- schaltung in dem entsprechenden Nockenpaar von einem Nocken auf den anderen mittels dieses Verstellsegments erfolgt.Preferably, the adjustment segments are assigned to different cam pairs. As a result, the cam pairs can be switched with a time delay. In this context, the term "assignable" should be understood in particular to mean that a changeover in the corresponding cam pair takes place from one cam to the other by means of this adjustment segment.
Ist das erste Verstellsegment zumindest teilweise im Winkelbereich einer Grundkreisphase wenigstens eines Nockenpaares angeordnet, ist zumindest dieses eine Nockenpaar mittels des ersten Verstellsegments schaltbar.If the first adjustment segment is arranged at least partially in the angular range of a base circle phase of at least one cam pair, at least this one cam pair can be switched by means of the first adjustment segment.
Ist ferner das zweite Verstellsegment zumindest teilweise im Winkelbereich einer Grundkreisphase wenigstens eines weiteren Nockenpaares angeordnet, ist zumindest dieses weitere Nockenpaar mittels des zweiten Verstellsegments schaltbar, wodurch die beiden Nockenelemente abschnittsweise geschaltet werden können .Furthermore, if the second adjusting segment is arranged at least partially in the angular range of a base circle phase of at least one further cam pair, at least this further cam pair can be switched by means of the second adjusting segment, whereby the two cam elements can be switched in sections.
Weiter wird vorgeschlagen, dass die Schaltkulisse zumindest eine zweite Kulissenbahn aufweist, die dazu vorgesehen ist, das Nockenelement in eine weitere Schaltrichtung axial zu verschieben. Dadurch ist eine Rückschaltung in die erste Stellung einfach möglich. Dabei ist eine beliebige Anordnung der Kulissenbahnen auf dem Nockenelement möglich. Beispielsweise ist es möglich, die Kulissenbahnen getrennt auszuführen, wobei dabei auch mehrere Nockenpaare zwischen den Kulissenbahnen liegen können. Alternativ können die Kulissenbahnen aber auch unmittelbar benachbart oder auch als sich kreuzende Kulissenbahnen ausgeführt werden.It is further proposed that the shift gate has at least a second slide track, which is intended to move the cam member axially in a further switching direction. This makes it easy to switch back to the first position. Any arrangement of the slide tracks on the cam element is possible. For example, it is possible to perform the slide tracks separately, while also several pairs of cams can lie between the slide tracks. Alternatively, the slide tracks but also directly adjacent or running as intersecting slide tracks.
Vorzugsweise weist die zweite Kulissenbahn zumindest zwei Verstellsegmente auf, die spiegelsymmetrisch zu den Verstellsegmenten der ersten Kulissenbahn angeordnet sind. Dadurch kann vorteilhaft ein abschnittsweises Schalten des Nockenelements in eine zweite Schaltrichtung, die vorteilhafterweise der Schaltrichtung der ersten Schaltkulissen entgegengesetzt ist, erreicht werden.Preferably, the second slide track on at least two Verstellsegmente, which are arranged mirror-symmetrically to the adjustment segments of the first slide track. As a result, a section-wise switching of the cam element in a second switching direction, which is advantageously opposite to the switching direction of the first shift gate, can advantageously be achieved.
Weiter wird eine Ventiltriebvorrichtung für eine Brennkraftmaschine mit zumindest einem mittels einer Schaltkulisse axial verschiebbaren Nockenpaar mit zwei benachbart angeordneten Teilnocken vorgeschlagen, das dazu vorgesehen ist, einen verstellbaren Ventiltrieb zu realisieren, bei der die Teilnocken eine unterschiedliche axiale Breite aufweisen. Dadurch kann besonders einfach eine geräuscharm schaltende Ventiltriebvorrichtung bereitgestellt werden, die eine geringe Anzahl von Aktuatoren aufweist. Insbesondere können durch eine derartige Ausführung alle Nockenpaare auf einem axial verschiebbaren Nockenelement angeordnet werden, und eine Auswahl, welche No- ckenpaare abschnittsweise durch ein axiales Verschieben des Nockenelements geschaltet werden, kann durch eine Ausführung der Nockenpaare, insbesondere durch die Anordnung des breiten Teilnockens und des schmalen Teilnockens, erreicht werden. Für einen V-Motor ist eine solche Ausführung der Teilnocken eines Nockenpaares besonders vorteilhaft, da eine Anordnung der verbreiterten Teilnocken auf die Zündreihenfolge der Zylinder insbesondere in den unterschiedlichen Zylinderbänken angepasst werden kann.Further, a valve drive device for an internal combustion engine is proposed with at least one cam pair axially displaceable cam pair with two adjacently arranged part cam, which is intended to realize an adjustable valve train in which the partial cams have a different axial width. As a result, it is particularly easy to provide a low-noise switching valve drive device which has a small number of actuators. In particular, by means of such an embodiment all cam pairs can be arranged on an axially displaceable cam element, and a selection, which pairs of pairs can be switched in sections by an axial displacement of the cam element can be achieved by an embodiment of the cam pairs, in particular by the arrangement of the wide part cam and the narrow part cam. Such a design of the partial cams of a cam pair is particularly advantageous for a V-engine, since an arrangement of the widened partial cams can be adapted to the firing order of the cylinders, in particular in the different cylinder banks.
Vorzugsweise ist dabei die axiale Breite des einen Teilnockens ca. doppelt so groß wie die axiale Breite des zweiten Teilnockens. Dadurch kann durch eine axiale Verschiebung insbesondere um einen Wert, der ein drittel einer axialen Breite des gesamten Nockenpaares entspricht, erreicht werden, dass abhängig von einer Ausgangsstellung eine Schaltung des Ventiltriebs erfolgt oder nicht, wodurch einfach ein abschnittsweise schaltbarer Ventiltrieb realisiert werden kann.Preferably, the axial width of the one sub-cam is approximately twice as large as the axial width of the second sub-cam. This can be achieved by an axial displacement, in particular by a value which corresponds to one third of an axial width of the entire pair of cams, that depending on an initial position, a circuit of the valve train takes place or not, which can be easily realized a partially switchable valve train.
Unter „ca. " soll dabei insbesondere verstanden werden, dass das tatsächliche Maß um weniger als 20% von dem angegebenen Maß abweicht, vorteilhaft um weniger als 10% abweicht, bevorzugt um weniger als 5% und besonders bevorzugt um weniger als ein 2% von dem angegebenen Maß abweicht.Under "approx. In particular, it should be understood that the actual measurement deviates by less than 20% from the specified measure, advantageously deviates by less than 10%, preferably deviates by less than 5% and particularly preferably by less than 2% from the specified measure ,
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In den Zeichnungen ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen. Dabei zeigen:Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The description and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. Showing:
Fig. 1 eine perspektivische Darstellung einer erfindungsgemäßen Ventiltriebvorrichtung,1 is a perspective view of a valve drive device according to the invention,
Fig. 2 eine Ausführung einer ersten Kulissenbahn der Ventiltriebvorrichtung undFig. 2 shows an embodiment of a first slide track of the valve drive device and
Fig. 3 eine perspektivische Darstellung der Kulissenbahn.Fig. 3 is a perspective view of the slide track.
Figur 1 zeigt eine Ventiltriebvorrichtung einer Brennkraftmaschine, die als ein Reihen-Vierzylindermotor ausgeführt ist. Die Ventiltriebvorrichtung weist ein auf einer Nockenwelle 35 angeordnetes Nockenelement 16 auf, das mittels einer Schaltkulisse 14 axial verschiebbar ist und über das ein verstellbarer Ventiltrieb realisiert ist. Die Nockenwelle 35 durchdringt dabei das gesamte Nockenelement 16. Alternativ ist es jedoch auch denkbar, dass die Nockenwelle 35 das Nockenelement 16 nur teilweise durchdringt. Beispielsweise ist eine Krafteinleitung in das Nockenelement 16 über eine Nockenwelle 35, die beispielsweise weniger als 25% des Nockenelements 16 durchdringt, ebenfalls möglich.Figure 1 shows a valve train device of an internal combustion engine, which is designed as a series four-cylinder engine. The valve drive device has a cam element 16 arranged on a cam element 16, which is axially displaceable by means of a shift gate 14 and over which an adjustable valve train is realized. However, it is also conceivable that the camshaft 35 only partially penetrates the cam element 16. For example, an introduction of force into the cam element 16 via a camshaft 35, which, for example, penetrates less than 25% of the cam element 16, is also possible.
Das Nockenelement 16 weist vier Nockenpaare 10, 11, 12, 13 mit jeweils zwei Teilnocken 27, 28, 29, 30, 31, 32, 33, 34 auf. Die Nockenpaare 10, 11, 12, 13 sind jeweils doppelt ausgeführt, wobei zur Unterscheidung in den Figuren die doppelt ausgeführten Komponenten im Folgenden mit den Buchstaben a und b bezeichnet werden. Da die doppelt ausgeführten Komponenten in ihrer Funktion jedoch jeweils gleich sind, wird auf den Buchstaben in der folgenden Beschreibung verzichtet, wobei dabei jedoch beide in den Figuren mit a und b bezeichneten Komponenten jeweils äquivalent zu betrachten sind.The cam member 16 has four cam pairs 10, 11, 12, 13, each with two partial cams 27, 28, 29, 30, 31, 32, 33, 34. The pairs of cams 10, 11, 12, 13 are each made in duplicate, with the double components in the following being designated by the letters a and b for differentiation in the figures. However, since the dual components are equal in function, the letter will be omitted in the following description, but with both components indicated a and b in the figures being equivalent to each other.
Jedes doppelt ausgeführte Nockenpaar ist einem Zylinder der Brennkraftmaschine zuordenbar. Eine axiale Breite der Teilnocken 27, 28, 29, 30, 31, 32, 33, 34 eines Nockenpaares 10, 11, 12, 13 ist dabei unterschiedlich groß. Der erste Teilnocken 27, 29, 31, 33 weist dabei eine axiale Breite auf, die ca. doppelt so groß ist wie die axiale Breite des zweiten Teilnockens 28, 30, 32, 34. Mittels den Nockenpaaren 10, 11,Each double cam pair is assigned to a cylinder of the internal combustion engine. An axial width of the partial cams 27, 28, 29, 30, 31, 32, 33, 34 of a cam pair 10, 11, 12, 13 is different in size. The first part cam 27, 29, 31, 33 in this case has an axial width which is about twice as large as the axial width of the second part cam 28, 30, 32, 34. By means of the cam pairs 10, 11,
12, 13 werden Gaswechselventile 15 der Zylinder betätigt. In Figur 1 sind dabei lediglich Gaswechselventile 15 des ersten Zylinders dargestellt. Ein Aufbau und eine Anordnung der restlichen Gaswechselventile mit zugehöriger Betätigungsaktu- atorik sind analog ausgeführt und hier nicht näher dargestellt.12, 13 gas exchange valves 15 of the cylinder are actuated. In Figure 1, only gas exchange valves 15 of the first cylinder are shown. A structure and an arrangement of the remaining gas exchange valves with associated Betätigungsaktu- atorik are analogous and not shown here.
Alle Nockenpaare weisen eine Grundkreisphase 20, 21, 22, 23 und eine Öffnungsphase 36, 37, 38, 39 auf. In der Grundkreisphase 20, 21, 22, 23 ist das dem Nockenpaar 10, 11, 12, 13 zugeordnetes Gaswechselventil 15 geschlossen und der entsprechende Teilnocken 27, 28, 29, 30, 31, 32, 33, 34 des Nockenpaars 10, 11, 12, 13 ist entlastet. In der Öffnungsphase 36, 37, 38, 39 ist das dem Nockenpaar 10, 11, 12, 13 zugeordnete Gaswechselventil 15 geöffnet und der entsprechende Teilnocken 27, 28, 29, 30, 31, 32, 33, 34 des Nockenpaars 10, 11, 12, 13 ist belastet. Grundsätzlich kann jedoch auch ein Teilnocken derart ausgestaltet werden, dass das Gaswechselventil über einen gesamten Winkelbereich geschlossen bleibt.All cam pairs have a base circle phase 20, 21, 22, 23 and an opening phase 36, 37, 38, 39. In the base circle phase 20, 21, 22, 23, the cam pair 10, 11, 12, 13 associated gas exchange valve 15 is closed and the corresponding part cam 27, 28, 29, 30, 31, 32, 33, 34 of the cam pair 10, 11, 12, 13 is relieved. In the opening phase 36, 37, 38, 39, the cam pair 10, 11, 12, 13 associated gas exchange valve 15 is opened and the corresponding part cam 27, 28, 29, 30, 31, 32, 33, 34 of the cam pair 10, 11, 12, 13 is charged. In principle, however, a partial cam can be configured such that the gas exchange valve remains closed over a whole angle range.
Die Schaltkulisse 14, mittels der das Nockenelement 10, 11, 12, 13 axial verschoben werden kann, weist zwei Kulissenbahnen 17, 24 auf. Die Ventiltriebvorrichtung weist zwei Aktua- toren mit Betätigungspins 40, 41 auf, die in die Kulissenbahnen 17, 24 einspuren können und über die eine Kraft zum Verstellen des Nockenelements 16, bzw. der Nockenpaare 10, 11, 12, 13 bereitgestellt wird. Aktuatoren zum Betätigen der Betätigungspins 40, 41 sind dem Fachmann bekannt und deshalb hier nicht näher dargestellt. Das Nockenelement 16 wird dabei abschnittsweise geschaltet, wobei die Nockenpaare 10, 11 der ersten beiden Zylinder einen Abschnitt bilden und die Nockenpaare 12, 13 der letzten beiden Zylinder einen weiteren Abschnitt.The shift gate 14, by means of which the cam member 10, 11, 12, 13 can be moved axially, has two slide tracks 17, 24. The valve drive device has two actuators with actuating pins 40, 41, which can engage in the guide tracks 17, 24 and via which a force for adjusting the cam member 16, or the cam pairs 10, 11, 12, 13 is provided. Actuators for actuating the actuating pins 40, 41 are known in the art and therefore not shown here. The cam member 16 is thereby switched in sections, wherein the cam pairs 10, 11 of the first two cylinders form a section and the cam pairs 12, 13 of the last two cylinders another section.
Mittel der ersten Kulissenbahn 17 kann das Nockenelement 16 axial in eine erste Schaltrichtung verschoben werden. Die erste Kulissenbahn 17 weist zwei Verstellsegmente 18, 19 auf, die den unterschiedlichen Nockenpaaren 10, 11, 12, 13 zuor- denbar sind. Die Verstellsegmente 18, 19 werden über ein Zwischensegment 42 verbunden. Am Beginn der Kulissenbahn 17 ist ein Einspursegment 43 angeordnet, am Ende der Kulissenbahn ein Ausspursegment 44. Die Kulissenbahn 17 mit dem Einspursegment 43, dem ersten Verstellsegment 18, dem Zwischensegment 42, dem zweiten Verstellsegment 19 und dem Ausspursegment 44 weist einen Winkelumfang von ca. 630° auf, d.h. sie läuft ca. VH mal um das Nockenelement 16 herum.Means of the first slide track 17, the cam member 16 can be moved axially in a first switching direction. The first slide track 17 has two adjustment segments 18, 19, which can be assigned to the different cam pairs 10, 11, 12, 13. The adjusting segments 18, 19 are connected via an intermediate segment 42. At the beginning of the slide track 17 a Einspursegment 43 is arranged at the end of the slide track a Ausspursegment 44. The slide track 17 with the Einspursegment 43, the first adjustment segment 18, the intermediate segment 42, the second adjustment segment 19 and the Ausspursegment 44 has an angular extent of about 630 °, ie it runs about VH times around the cam member 16 around.
Das erste Verstellsegment 18, mittels dem das Nockenelement 16 von einer ersten Schaltstellung in eine Mittelstellung verschoben wird, ist den Nockenpaaren 10, 11 der ersten beiden Zylinder zuordenbar. In der ersten Schaltstellung werden die Gaswechselventile der ersten beiden Zylinder durch die schmalen Teilnocken 30, 32 der entsprechenden Nockenpaare 10, 11 geöffnet (vgl. Fig. 1) . Die Gaswechselventile 15 der letzten beiden Zylinder werden in der ersten Schaltstellung durch die breiten Teilnocken 31, 33 der entsprechenden Nockenpaare 12, 13 betätigt.The first adjustment segment 18, by means of which the cam member 16 is moved from a first switching position to a middle position, the cam pairs 10, 11 of the first two cylinders can be assigned. In the first switching position, the gas exchange valves of the first two cylinders are opened by the narrow partial cams 30, 32 of the corresponding cam pairs 10, 11 (compare FIG. The gas exchange valves 15 of the last two cylinders are actuated in the first switching position by the wide part cam 31, 33 of the corresponding cam pairs 12, 13.
Das erste Verstellsegment 18 ist in einem Winkelbereich, der den Grundkreisphasen 20, 21 der Nockenpaare 10, 11 der ersten beiden Zylinder zuordenbar ist, angeordnet. Über das erste Verstellsegment 18 werden die Nockenpaare 10, 11 von der ersten Schaltstellung in die Mittelstellung verschoben. In der Mittelstellung werden die Gaswechselventile 15 der ersten beiden Zylinder über die breiten Teilnocken 27, 29 der entsprechenden Nockenpaare 10, 11 betätigt. Bei den ersten beiden Zylindern wurde von den schmalen Teilnocken 28, 30 auf die breiten Teilnocken 27, 29 gewechselt. Die Gaswechselventile 15 der beiden letzten Zylinder werden in der Zwischenstellung ebenfalls durch die breiten Teilnocken 31, 33 der entsprechenden Nockenpaare 12, 13 geöffnet. Bei diesem Nockenpaaren 12, 13 wurde durch das erste Verstellsegment 18 lediglich unter Last eine Position von Nockenfolgern 45 auf den entsprechenden Teilnocken 31, 33 verschoben.The first adjustment segment 18 is arranged in an angular range, which is the Grundkreisphasen 20, 21 of the cam pairs 10, 11 of the first two cylinders assigned. About the first adjustment segment 18, the cam pairs 10, 11 are moved from the first switching position to the middle position. In the middle position, the gas exchange valves 15 of the first two cylinders on the wide part cam 27, 29 of the corresponding cam pairs 10, 11 actuated. In the first two cylinders was changed from the narrow part cam 28, 30 on the wide part cam 27, 29. The gas exchange valves 15 of the two last cylinders are also opened in the intermediate position by the wide part cam 31, 33 of the corresponding cam pairs 12, 13. In this pair of cams 12, 13 was moved by the first adjustment segment 18 only under load, a position of cam followers 45 on the corresponding part cam 31, 33.
Das zweite Verstellsegment 19 der ersten Kulissenbahn 17 ist den Nockenpaaren 12, 13 der letzen beiden Zylinder zuorden- bar. Das zweite Verstellsegment 19 verschiebt das Nockenelement 16 von der Mittelstellung in eine zweite Schaltstellung.The second adjustment segment 19 of the first slide track 17 can be assigned to the cam pairs 12, 13 of the last two cylinders. The second adjustment segment 19 displaces the cam element 16 from the middle position into a second switching position.
Das zweite Verstellsegment 19 ist in einem Winkelbereich, der den Grundkreisphasen 22, 23 der Nockenpaare 12, 13 der letzten beiden Zylinder zuordenbar ist, angeordnet. Durch das zweite Verstellsegment 19 wird bei den Nockenpaaren 12, 13 der letzten beiden Zylinder von dem breiten Teilnocken 31, 33 der entsprechenden Nockenpaare 12, 13 auf den schmalen Teilnocken 32, 34 gewechselt, wobei sich die Nockenpaare 12, 13 dabei in der Grundkreisphase 22, 23 befinden und somit entlastet sind. Bei den Nockenpaaren 10, 11 der ersten beiden Zylinder wird durch das zweite Verstellsegment 19 lediglich eine Position der Nockenfolger 45 auf den entsprechenden breiten Teilnocken 27, 29 verschoben, wobei diese dabei belastet sind.The second adjustment segment 19 is in an angular range, the base circle phases 22, 23 of the cam pairs 12, 13 of the last two cylinders can be assigned arranged. By the second adjustment segment 19 is in the cam pairs 12, 13 of the last two cylinders of the wide part cam 31, 33 of the corresponding pairs of cams 12, 13 changed to the narrow part cam 32, 34, wherein the cam pairs 12, 13 thereby in the base circle phase 22nd , 23 are located and thus relieved. In the case of the cam pairs 10, 11 of the first two cylinders, only one position of the cam followers 45 is displaced by the second adjusting segment 19 onto the corresponding, wide partial cams 27, 29, whereby they are loaded.
In der zweiten Schaltstellung werden die Gaswechselventile 15 der ersten beiden Zylinder dann durch die breiten Teilnocken 27, 29 der entsprechenden Nockenpaare 10, 11 betätigt. Die Gaswechselventile 15 der letzten beiden Zylinder werden durch die schmalen Teilnocken 32, 34 der entsprechenden Nockenpaare 12, 13 betätigt.In the second switching position, the gas exchange valves 15 of the first two cylinders are then actuated by the wide part cam 27, 29 of the corresponding cam pairs 10, 11. The gas exchange valves 15 of the last two cylinders are through the narrow part cam 32, 34 of the corresponding cam pairs 12, 13 is actuated.
Die zweite Kulissenbahn 24 ist spiegelsymmetrisch zu der ersten Kulissenbahn 17 aufgebaut. Mittels der zweiten Kulissenbahn 24 kann das Nockenelement 16 in eine zweite Schaltrichtung, die entgegengesetzt zu der ersten Schaltrichtung gerichtet ist, verschoben werden. Auch sie weist zwei Verstellsegmente 25, 26 auf. Über das erste Verstellsegment 25 wird das Nockenelement 16 von der zweiten Schaltstellung in die Zwischenstellung verschoben. Über das zweite Verstellsegment 26 wird das Nockenelement 16 von der Zwischenstellung in die erste Schaltstellung verschoben.The second slide track 24 is constructed mirror-symmetrically to the first slide track 17. By means of the second slide track 24, the cam member 16 in a second switching direction, which is directed opposite to the first switching direction, are moved. It also has two adjustment segments 25, 26. About the first adjustment segment 25, the cam member 16 is moved from the second switching position to the intermediate position. About the second adjustment segment 26, the cam member 16 is moved from the intermediate position to the first switching position.
Die beiden Kulissenbahnen 17, 24 sind getrennt voneinander ausgeführt. Die erste Kulissenbahn 17 ist zwischen den Nockenpaaren 10, 11 der ersten beiden Zylinder angeordnet. Die zweite Kulissenbahn 24 ist zwischen den Nockenpaaren 12, 13 der letzten beiden Zylinder angeordnet. Grundsätzlich ist jedoch auch eine andere Anordnung der Kulissenbahnen 17, 24 möglich. The two slide tracks 17, 24 are executed separately. The first slide track 17 is arranged between the cam pairs 10, 11 of the first two cylinders. The second slide track 24 is arranged between the cam pairs 12, 13 of the last two cylinders. In principle, however, another arrangement of the slide tracks 17, 24 is possible.

Claims

Patentansprüche claims
1. Ventiltriebvorrichtung, insbesondere einer Brennkraftmaschine, mit zumindest einem Nockenelement (16), das mittels einer Schaltkulisse (14) axial verschiebbar ist und das dazu vorgesehen ist, einen schaltbaren Ventiltrieb bereitzustellen, dadurch gekennzeichnet, dass das Nockenelement (16) zumindest drei Nockenpaare (10,1. Valve drive device, in particular an internal combustion engine, with at least one cam element (16) which is axially displaceable by means of a shift gate (14) and which is provided to provide a switchable valve train, characterized in that the cam element (16) at least three pairs of cams ( 10
11, 12, 13) aufweist, die dazu vorgesehen sind,11, 12, 13), which are intended
Gaswechselventile (15) zumindest dreier Zylinder zu betätigen.Gas exchange valves (15) to actuate at least three cylinders.
2. Ventiltriebvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Nockenelement (16) einstückig ausgeführt ist.2. Valve drive device according to claim 1, characterized in that the cam element (16) is made in one piece.
3. Ventiltriebvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Nockenelement (16) zumindest ein viertes Nockenpaar (13) aufweist. 3. Valve drive device according to claim 1 or 2, characterized in that the cam element (16) has at least a fourth cam pair (13).
4. Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schaltkulisse (14) zumindest eine erste Kulissenbahn (17) mit zumindest zwei Verstellsegmenten (18, 19) aufweist, die dazu vorgesehen ist, die Nockenpaare (10, 11, 12, 13) in eine Schaltrichtung axial zu verschieben.4. Valve drive device according to one of the preceding claims, characterized in that the shift gate (14) has at least one first slide track (17) with at least two Verstellsegmenten (18, 19) which is intended, the cam pairs (10, 11, 12, 13) to move axially in a switching direction.
5. Ventiltriebvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Verstellsegmente (18, 19) unterschiedlichen Nockenpaaren (10, 11, 12, 13) zuordenbar sind.5. Valve drive device according to claim 4, characterized in that the adjusting segments (18, 19) different cam pairs (10, 11, 12, 13) are assignable.
6. Ventiltriebvorrichtung zumindest nach Anspruch 4, dadurch gekennzeichnet, dass das erste Verstellsegment (18) zumindest teilweise im Winkelbereich einer Grundkreisphase (22, 23) wenigstens eines Nockenpaares (12, 13) angeordnet ist.6. Valve drive device at least according to claim 4, characterized in that the first adjustment segment (18) at least partially in the angular range of a base circle phase (22, 23) of at least one cam pair (12, 13) is arranged.
7. Ventiltriebvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das zweite Verstellsegment (19) zumindest teilweise im Winkelbereich einer Grundkreisphase (20, 21) wenigstens eines weiteren Nockenpaares (10, 11) angeordnet ist.7. Valve drive device according to claim 6, characterized in that the second adjusting segment (19) at least partially in the angular range of a base circle phase (20, 21) of at least one further cam pair (10, 11) is arranged.
8. Ventiltriebvorrichtung zumindest nach Anspruch 4, dadurch gekennzeichnet, dass die Schaltkulisse (14) zumindest eine zweite Kulissenbahn (24) aufweist, die dazu vorgesehen ist, die Nockenpaare (10, 11, 12, 13) in eine weitere Schaltrichtung axial zu verschieben . 8. Valve drive device at least according to claim 4, characterized in that the shift gate (14) has at least one second slide track (24) which is intended to move the cam pairs (10, 11, 12, 13) axially in a further switching direction.
9. Ventiltriebvorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die zweite Kulissenbahn (24) zumindest zwei Verstellsegmente (25, 26) aufweist, die spiegelsymmetrisch zu den Verstellsegmenten (18, 19) der ersten Kulissenbahn (17) angeordnet sind.9. Valve drive device according to claim 8, characterized in that the second slide track (24) at least two Verstellsegmente (25, 26) which are arranged mirror-symmetrically to the Verstellsegmenten (18, 19) of the first slide track (17).
10. Ventiltriebvorrichtung für eine Brennkraftmaschine mit zumindest einem mittels einer Schaltkulisse (14) axial verschiebbaren Nockenpaar (10, 11, 12, 13) mit zwei benachbart angeordneten Teilnocken (27, 28, 29, 30, 31, 32, 33, 34), das dazu vorgesehen ist, einen verstellbaren Ventiltrieb zu realisieren, insbesondere eine Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Teilnocken (27, 28, 29, 30, 31, 32, 33, 34) eine unterschiedliche axiale Breite aufweisen.10. Valve drive device for an internal combustion engine with at least one by means of a shift gate (14) axially displaceable cam pair (10, 11, 12, 13) with two adjacently arranged part cam (27, 28, 29, 30, 31, 32, 33, 34), which is intended to realize an adjustable valve train, in particular a valve drive device according to one of the preceding claims, characterized in that the partial cams (27, 28, 29, 30, 31, 32, 33, 34) have a different axial width.
11. Ventiltriebvorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die axiale Breite des einen Teilnockens (27, 29, 31, 33) ca. doppelt so groß ist wie die axiale Breite des zweiten Teilnockens (28, 30, 32, 34) . 11. Valve drive device according to claim 10, characterized in that the axial width of the one partial cam (27, 29, 31, 33) is approximately twice as large as the axial width of the second partial cam (28, 30, 32, 34).
PCT/EP2008/008842 2007-11-17 2008-10-18 Valve driving device WO2009062586A1 (en)

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DE102011011457A1 (en) 2011-02-17 2012-08-23 Daimler Ag Internal combustion engine valve train device
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Citations (3)

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Publication number Priority date Publication date Assignee Title
US5129407A (en) * 1991-06-10 1992-07-14 J. D. Phillips Corporation Variable camshaft
EP0579592A1 (en) * 1992-07-13 1994-01-19 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Internal combustion engine comprising a camshaft with axial moving device
DE102005033018A1 (en) * 2005-07-15 2007-01-25 Schaeffler Kg Valve train for an internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5129407A (en) * 1991-06-10 1992-07-14 J. D. Phillips Corporation Variable camshaft
EP0579592A1 (en) * 1992-07-13 1994-01-19 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Internal combustion engine comprising a camshaft with axial moving device
DE102005033018A1 (en) * 2005-07-15 2007-01-25 Schaeffler Kg Valve train for an internal combustion engine

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