EP3324010B1 - Mechanically controllable valve drive - Google Patents

Mechanically controllable valve drive Download PDF

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Publication number
EP3324010B1
EP3324010B1 EP17192304.8A EP17192304A EP3324010B1 EP 3324010 B1 EP3324010 B1 EP 3324010B1 EP 17192304 A EP17192304 A EP 17192304A EP 3324010 B1 EP3324010 B1 EP 3324010B1
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EP
European Patent Office
Prior art keywords
intermediate lever
roller element
roller
shaft
roller member
Prior art date
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EP17192304.8A
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German (de)
French (fr)
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EP3324010A1 (en
Inventor
Roland Kaiser
Dr. Michael Breuer
Christoph Sadowski
Thorsten Schorn
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Pierburg GmbH
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Pierburg GmbH
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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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L2013/0068—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 with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a mechanically controllable valve drive with an intermediate lever with a first roller member, which rotates about a first axis of rotation and cooperates with a circumferential contour of a camshaft, with two valve bodies, in particular a second roller member and a third roller member, which about a common, to the first axis of rotation rotate second offset parallel second axis of rotation, wherein the second and third roller member are each in contact with a backdrop and a peripheral contour of a control shaft, and with a working cam contour over which the intermediate lever acts on a finger follower of a gas exchange valve, wherein the first roller member axially between the second Roller member and third roller member is arranged.
  • valve trains are known from the prior art and are used to reduce fuel consumption and pollutant emissions in motor vehicles with an internal combustion engine.
  • the valve trains usually have an intermediate lever and a roller rocker arm, wherein the intermediate lever and the roller rocker arm are arranged kinematically between a camshaft and a gas exchange valve.
  • the cam rotation is transmitted to the intermediate lever via a first roller mounted in the intermediate lever, wherein the intermediate lever executes a tilting movement and thereby actuates the roller rocker arm via a trained on the intermediate lever working cam contour.
  • the roller rocker arm cooperates with the gas exchange valve, so that the tilting movement and the actuation of the Rollenschlepphebels an actuation of the gas exchange valve takes place.
  • a second roller disposed on the intermediate lever is operatively connected to a control shaft, wherein the rotation of the control shaft changes the tilting movement of the intermediate lever or the working curve contour and thereby sets the opening and closing movement of the gas exchange valve.
  • the WO 2016/005071 A1 discloses, for example, such a mechanically controllable valve train, wherein the valve train has an intermediate lever which acts on a drag lever via a working cam contour.
  • the intermediate lever has a first roller member with a first axis of rotation and a second roller member with a second axis of rotation, wherein the first roller member with a circumferential contour of a camshaft and the second roller member with a link and a peripheral contour of a control shaft are operatively connected.
  • a disadvantage of the in the WO 2016/005071 A1 disclosed embodiment is that the mechanically controllable valve train has a large space.
  • the invention is therefore the object of further developing a mechanically controllable valve train such that the space of the valve train is reduced, without reducing the rigidity of the valve train.
  • the roller members are each arranged in a transverse plane, wherein the peripheral surfaces of the roller members do not overlap in the axial direction and wherein the intermediate lever has two mutually parallel legs, wherein the first Roller member between the two legs is arranged and the legs are arranged between the second and third roller member, such that a cam of the cam shaft during the rotational movement passes through the intermediate lever, wherein the cam extends between the two legs.
  • the distance between the camshaft and the intermediate lever can be reduced, since the cam of the camshaft during its rotational movement can pass through the intermediate lever and is hindered by any other components of the intermediate lever in its rotational movement.
  • roller members are arranged in different transverse planes, which increases the rigidity of the valve gear and the tilting of the intermediate lever is avoided by the symmetrical arrangement of the second and third roller member in the intermediate lever.
  • the space of the valve train is reduced, without lowering the stiffness of the valve train.
  • the second roller member and the third roller member are connected to each other via a shaft, wherein the shaft is mounted via a bearing unit in the intermediate lever.
  • the second roller member and the third roller member via a non-positive or positive connection with the shaft rotatably connected.
  • the intermediate lever has a sleeve which is fixed in Intermediate lever is arranged and connects the two legs together.
  • a bearing unit is arranged, for example, a needle bearing, via which the shaft is rotatably mounted in the sleeve.
  • the second roller member and the third roller member are connected via press connections to the shaft, whereby the roller members are reliably rotatably connected to the shaft, without requiring an assembly of additional components, such as circlips or feather keys.
  • the second roller member and the third roller member are rotatably mounted on an axle, wherein the axis is fixedly connected to the intermediate lever and the second roller member and the third roller member are rotatably mounted on the axle via a respective bearing unit.
  • the storage units required for the rotatable mounting of the second and third bearing member are arranged outside of the intermediate lever. The arrangement of the bearing members outside of the intermediate lever, the distance between the camshaft and the intermediate lever is reduced because the cam of the camshaft during its rotational movement can continue to engage in the intermediate lever. In this way, the space of the mechanically controllable valve train is reduced.
  • FIG. 1 shows a mechanically controllable valve train 2 for a gas exchange valve 4 with an intermediate lever 6 and a drag lever 8, wherein the intermediate lever 6 via a working cam contour 22 with a rocker arm 8 rotatably mounted cam follower roller 24 cooperates.
  • the drag lever 8 is operatively connected to a gas exchange valve 4 loaded by a spring 5 and to a valve play compensation element 28, so that the drag lever 8 rests without play on the gas exchange valve 4 and the gas exchange valve 4 is actuated via the drag lever 8.
  • the intermediate lever 6 has a first roller member 10, which is rotatably supported via a first bearing unit 12 on the intermediate lever 6 and rotates about a first axis of rotation 11.
  • the first roller member 10 is with its peripheral surface with a cam 15 of a camshaft 14 in contact and transmits the camshaft rotational movement to the intermediate lever 6, wherein the intermediate lever 6 performs a pivoting movement.
  • the intermediate lever 6 has a rotatably mounted in the intermediate lever 6 second and third roller member 16, 18, wherein in FIG. 1 only the second roller member 16 is shown. Both roller members 16, 18 rotate about a second axis of rotation 17, wherein the axis of rotation 17 is arranged offset from the first axis of rotation 11.
  • the two roller organs 16, 18 are each with a control shaft 19 and a link 20 in engagement.
  • the control shaft 19 is rotatable by an actuator not shown in predefined positions and has a cam, so that on the rotation of the control shaft 19, the position of the intermediate lever 6 and thereby the operation of the gas exchange valve 4 is controllable.
  • the gate 20 is for example arranged rigidly in the cylinder head and serves as a guide of the intermediate lever 6 during its position change.
  • FIG. 2 shows a first embodiment and FIG. 3 a second embodiment of the storage of the second and third roller member 16, 18.
  • Die Figures 2 and 3 show an intermediate lever 6 having a first and a second leg 30, 32.
  • the legs 30, 32 are connected via a working curve contour 22 forming web 34, an axis 36 and a sleeve 38 and an axle 46 with each other.
  • the bearing unit 12 is arranged, via which the first roller member 10 is mounted in the intermediate lever 6.
  • the sleeve 38 serves as a receptacle of a shaft 42.
  • the second roller member 16 is rotatably connected to the shaft 42 and at a second end of the shaft 42, the third roller member 18 with the shaft 42 rotatably connected.
  • the shaft 42 is rotatably supported via a second bearing unit 44 in the sleeve.
  • FIG. 3 shown second embodiment of the in FIG. 2 shown first embodiment is that instead of the sleeve 38, an axle 46 is fixedly arranged in the intermediate lever 6. At the two ends of the axle 46 are each a bearing unit 48, 50 is arranged, via the bearing unit 48, the second roller member 16 and the bearing unit 50, the third roller member 18 are rotatably mounted on the axle 46.
  • roller members 12, 16, 18 causes each roller member 12, 16, 18 is arranged in each case a transverse plane and the peripheral surfaces of the roller members 12, 16, 18 in the longitudinal direction of the shaft 42 and the axis 46 does not overlap ,
  • the camshaft can be arranged closer to the intermediate lever 6, whereby the space of the mechanically controllable valve train 2 is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Mechanically-Actuated Valves (AREA)

Description

Die Erfindung betrifft einen mechanisch steuerbaren Ventiltrieb mit einem Zwischenhebel mit einem ersten Rollenorgan, welches um eine erste Drehachse rotiert und mit einer Umfangskontur einer Nockenwelle zusammenwirkt, mit zwei Ventilkörpern, insbesondere einem zweiten Rollenorgan und einem dritten Rollenorgan, welche um eine gemeinsame, zur ersten Drehachse parallel versetzte zweite Drehachse rotieren, wobei das zweite und dritte Rollenorgan jeweils mit einer Kulisse und mit einer Umfangskontur einer Steuerwelle in Kontakt stehen, und mit einer Arbeitskurvenkontur, über die der Zwischenhebel auf einen Schlepphebel eines Gaswechselventils wirkt, wobei das erste Rollenorgan axial zwischen dem zweiten Rollenorgan und dritten Rollenorgan angeordnet ist.The invention relates to a mechanically controllable valve drive with an intermediate lever with a first roller member, which rotates about a first axis of rotation and cooperates with a circumferential contour of a camshaft, with two valve bodies, in particular a second roller member and a third roller member, which about a common, to the first axis of rotation rotate second offset parallel second axis of rotation, wherein the second and third roller member are each in contact with a backdrop and a peripheral contour of a control shaft, and with a working cam contour over which the intermediate lever acts on a finger follower of a gas exchange valve, wherein the first roller member axially between the second Roller member and third roller member is arranged.

Derartige mechanisch steuerbare Ventiltriebe sind aus dem Stand der Technik bekannt und werden zur Reduzierung des Kraftstoffbedarfs und der Schadstoffemissionen bei Kraftfahrzeugen mit einem Verbrennungsmotor eingesetzt. Die Ventiltriebe weisen üblicherweise einen Zwischenhebel und einen Rollenschlepphebel auf, wobei der Zwischenhebel und der Rollenschlepphebel kinematisch zwischen einer Nockenwelle und einem Gaswechselventil angeordnet sind. Dabei wird über eine erste im Zwischenhebel gelagerte Rolle die Nockendrehbewegung auf den Zwischenhebel übertragen, wobei der Zwischenhebel eine Kippbewegung ausführt und dadurch über eine am Zwischenhebel ausgebildete Arbeitskurvenkontur den Rollenschlepphebel betätigt. Der Rollenschlepphebel wirkt mit dem Gaswechselventil zusammen, so dass über die Kippbewegung und die Betätigung des Rollenschlepphebels eine Betätigung des Gaswechselventils erfolgt. Eine zweite am Zwischenhebel angeordnete Rolle ist mit einer Steuerwelle wirkverbunden, wobei die Verdrehung der Steuerwelle die Kippbewegung des Zwischenhebels bzw. der Arbeitskurvenkontur verändert und dadurch die Öffnungs- und Schließbewegung des Gaswechselventils eingestellt.Such mechanically controllable valve trains are known from the prior art and are used to reduce fuel consumption and pollutant emissions in motor vehicles with an internal combustion engine. The valve trains usually have an intermediate lever and a roller rocker arm, wherein the intermediate lever and the roller rocker arm are arranged kinematically between a camshaft and a gas exchange valve. In this case, the cam rotation is transmitted to the intermediate lever via a first roller mounted in the intermediate lever, wherein the intermediate lever executes a tilting movement and thereby actuates the roller rocker arm via a trained on the intermediate lever working cam contour. The roller rocker arm cooperates with the gas exchange valve, so that the tilting movement and the actuation of the Rollenschlepphebels an actuation of the gas exchange valve takes place. A second roller disposed on the intermediate lever is operatively connected to a control shaft, wherein the rotation of the control shaft changes the tilting movement of the intermediate lever or the working curve contour and thereby sets the opening and closing movement of the gas exchange valve.

Die WO 2016/005071 A1 offenbart beispielsweise einen derartigen mechanisch steuerbaren Ventiltrieb, wobei der Ventiltrieb einen Zwischenhebel aufweist, der über eine Arbeitskurvenkontur auf einen Schlepphebel wirkt. Der Zwischenhebel weist ein erstes Rollenorgan mit einer ersten Drehachse und einen zweites Rollenorgan mit einer zweiten Drehachse auf, wobei das erste Rollenorgan mit einer Umfangskontur einer Nockenwelle und das zweite Rollenorgan mit einer Kulisse und einer Umfangskontur einer Steuerwelle wirkverbunden sind.The WO 2016/005071 A1 discloses, for example, such a mechanically controllable valve train, wherein the valve train has an intermediate lever which acts on a drag lever via a working cam contour. The intermediate lever has a first roller member with a first axis of rotation and a second roller member with a second axis of rotation, wherein the first roller member with a circumferential contour of a camshaft and the second roller member with a link and a peripheral contour of a control shaft are operatively connected.

Nachteilig an der in der WO 2016/005071 A1 offenbarten Ausführung ist, dass der mechanisch steuerbare Ventiltrieb einen großen Bauraum aufweist.A disadvantage of the in the WO 2016/005071 A1 disclosed embodiment is that the mechanically controllable valve train has a large space.

Aus der Druckschriften EP 1 387 048 A2 ist ein gattungsgemäßer Ventiltrieb beziehungsweise aus der WO 2012/107119 A1 ist ein Zwischenhebel für einen derartigen gattungsgemäßen Ventiltrieb bekannt, wobei der jeweilige Zwischenhebel zwar eine ausreichende Steifigkeit aufweist, jedoch immer noch einen großen Bauraum beansprucht.From the pamphlets EP 1 387 048 A2 is a generic valve train or from the WO 2012/107119 A1 is an intermediate lever for such a generic valve train known, wherein the respective intermediate lever while having sufficient rigidity, but still claimed a large space.

Der Erfindung liegt daher die Aufgabe zugrunde, einen mechanisch steuerbaren Ventiltrieb derart weiterzuentwickeln, dass der Bauraum des Ventiltriebs reduziert wird, ohne die Steifigkeit des Ventiltriebs zu reduzieren.The invention is therefore the object of further developing a mechanically controllable valve train such that the space of the valve train is reduced, without reducing the rigidity of the valve train.

Diese Aufgabe wird durch einen mechanisch steuerbaren Ventiltrieb mit den Merkmalen des Hauptanspruchs gelöst.This object is achieved by a mechanically controllable valve train with the features of the main claim.

Dadurch, dass das erste Rollenorgan axial zwischen dem zweiten Rollenorgan und dritten Rollenorgan angeordnet ist, sind die Rollenorgane jeweils in einer Querebene angeordnet, wobei sich die Umfangsflächen der Rollenorgane in Axialrichtung nicht überlagern und wobei der Zwischenhebel zwei zueinander parallel verlaufende Schenkel aufweist, wobei das erste Rollenorgan zwischen den beiden Schenkeln angeordnet ist und die Schenkel zwischen dem zweiten und dritten Rollenorgan angeordnet sind, derart, dass eine Nocke der Nockenwelle während der Drehbewegung den Zwischenhebel durchgreift, wobei die Nocke zwischen den beiden Schenkeln verläuft. Dadurch kann der Abstand zwischen der Nockenwelle und dem Zwischenhebel reduziert werden, da der Nocken der Nockenwelle während seiner Drehbewegung den Zwischenhebel durchgreifen kann und dabei durch keine anderen Komponenten des Zwischenhebels bei seiner Drehbewegung behindert wird. Auch werden auf diese Weise die Rollenorgane in unterschiedlichen Querebenen angeordnet, wobei durch die symmetrische Anordnung des zweiten und des dritten Rollenorgans im Zwischenhebel die Steifigkeit des Ventiltriebs erhöht und ein Verkippen des Zwischenhebels vermieden wird. Auf diese einfache und kostengünstige Weise wird der Bauraum des Ventiltriebs reduziert, ohne die Steifigkeit des Ventiltriebs abzusenken.Characterized in that the first roller member is disposed axially between the second roller member and third roller member, the roller members are each arranged in a transverse plane, wherein the peripheral surfaces of the roller members do not overlap in the axial direction and wherein the intermediate lever has two mutually parallel legs, wherein the first Roller member between the two legs is arranged and the legs are arranged between the second and third roller member, such that a cam of the cam shaft during the rotational movement passes through the intermediate lever, wherein the cam extends between the two legs. Thereby, the distance between the camshaft and the intermediate lever can be reduced, since the cam of the camshaft during its rotational movement can pass through the intermediate lever and is hindered by any other components of the intermediate lever in its rotational movement. Also, in this way, the roller members are arranged in different transverse planes, which increases the rigidity of the valve gear and the tilting of the intermediate lever is avoided by the symmetrical arrangement of the second and third roller member in the intermediate lever. In this simple and inexpensive way, the space of the valve train is reduced, without lowering the stiffness of the valve train.

In einer bevorzugten Ausgestaltung sind das zweite Rollenorgan und das dritte Rollenorgan über eine Welle miteinander verbunden, wobei die Welle über eine Lagereinheit im Zwischenhebel gelagert ist. Dabei sind das zweite Rollenorgan und das dritte Rollenorgan über jeweils eine kraftschlüssige oder formschlüssige Verbindung mit der Welle drehfest verbunden. Der Zwischenhebel weist eine Hülse auf, die fest im Zwischenhebel angeordnet ist und die beiden Schenkel miteinander verbindet. In der Hülse ist eine Lagereinheit angeordnet, beispielsweise ein Nadellager, über die die Welle drehbar in der Hülse gelagert ist. Eine derartige Ausgestaltung reduziert die Bauteileanzahl sowie den Montageaufwand, da lediglich eine Lagereinheit eingesetzt wird, um beide Rollenorgane im Zwischenhebel zu lagern.In a preferred embodiment, the second roller member and the third roller member are connected to each other via a shaft, wherein the shaft is mounted via a bearing unit in the intermediate lever. In this case, the second roller member and the third roller member via a non-positive or positive connection with the shaft rotatably connected. The intermediate lever has a sleeve which is fixed in Intermediate lever is arranged and connects the two legs together. In the sleeve, a bearing unit is arranged, for example, a needle bearing, via which the shaft is rotatably mounted in the sleeve. Such a configuration reduces the number of components and the assembly effort, since only one bearing unit is used to support both roller members in the intermediate lever.

Vorzugsweise sind das zweite Rollenorgan und das dritte Rollenorgan über Pressverbindungen mit der Welle verbunden, wodurch die Rollenorgane zuverlässig mit der Welle drehfest verbunden sind, ohne eine Montage von zusätzliche Bauteilen, beispielsweise Sicherungsringe oder Passfedern, zu erfordern.Preferably, the second roller member and the third roller member are connected via press connections to the shaft, whereby the roller members are reliably rotatably connected to the shaft, without requiring an assembly of additional components, such as circlips or feather keys.

In einer bevorzugten Ausgestaltung sind das zweite Rollenorgan und das dritte Rollenorgan auf einer Achse drehbar gelagert, wobei die Achse fest mit dem Zwischenhebel verbunden ist und das zweite Rollenorgan und das dritte Rollenorgan über jeweils eine Lagereinheit an der Achse drehbar gelagert sind. Dabei sind die für die drehbare Lagerung des zweiten und dritten Lagerorgans benötigten Lagereinheiten außerhalb des Zwischenhebels angeordnet. Durch die Anordnung der Lagerorgane außerhalb des Zwischenhebels wird der Abstand zwischen der Nockenwelle und dem Zwischenhebel reduziert, da der Nocken der Nockenwelle während seiner Drehbewegung weiter in den Zwischenhebel eingreifen kann. Auf diese Weise wird der Bauraum des mechanisch steuerbaren Ventiltriebs reduziert.In a preferred embodiment, the second roller member and the third roller member are rotatably mounted on an axle, wherein the axis is fixedly connected to the intermediate lever and the second roller member and the third roller member are rotatably mounted on the axle via a respective bearing unit. The storage units required for the rotatable mounting of the second and third bearing member are arranged outside of the intermediate lever. The arrangement of the bearing members outside of the intermediate lever, the distance between the camshaft and the intermediate lever is reduced because the cam of the camshaft during its rotational movement can continue to engage in the intermediate lever. In this way, the space of the mechanically controllable valve train is reduced.

Es wird somit ein mechanisch steuerbarer Ventiltrieb mit einer hohen Steifigkeit und einem reduzierten Bauraum geschaffen.It is thus created a mechanically controllable valve train with a high rigidity and a reduced space.

Die Erfindung wird nachfolgend anhand Zeichnungen näher erläutert.

  • Figur 1 zeigt eine erfindungsgemäße Ausführung eines mechanisch steuerbaren Ventiltriebs in Seitenansicht und geschnittener Darstellung,
  • Figur 2 zeigt eine erste Lagerung der Rollenorgane in Vorderansicht und geschnittener Darstellung, und
  • Figur 3 zeigt eine zweite Lagerung der Rollenorgane in Vorderansicht und geschnittener Darstellung.
The invention will be explained in more detail with reference to drawings.
  • FIG. 1 shows an embodiment according to the invention of a mechanically controllable valve drive in side view and sectional illustration,
  • FIG. 2 shows a first storage of the roller members in front view and sectional view, and
  • FIG. 3 shows a second storage of the roller organs in front view and sectional view.

Figur 1 zeigt einen mechanisch steuerbaren Ventiltrieb 2 für ein Gaswechselventil 4 mit einem Zwischenhebel 6 und einem Schlepphebel 8, wobei der Zwischenhebel 6 über eine Arbeitskurvenkontur 22 mit einer im Schlepphebel 8 drehbar angeordneten Schlepphebelrolle 24 zusammenwirkt. Der Schlepphebel 8 ist mit einem durch eine Feder 5 belasteten Gaswechselventil 4 und mit einem Ventilspielausgleichselement 28 wirkverbunden, so dass der Schlepphebel 8 spielfrei am Gaswechselventil 4 anliegt und das Gaswechselventil 4 über den Schlepphebel 8 betätigt wird. FIG. 1 shows a mechanically controllable valve train 2 for a gas exchange valve 4 with an intermediate lever 6 and a drag lever 8, wherein the intermediate lever 6 via a working cam contour 22 with a rocker arm 8 rotatably mounted cam follower roller 24 cooperates. The drag lever 8 is operatively connected to a gas exchange valve 4 loaded by a spring 5 and to a valve play compensation element 28, so that the drag lever 8 rests without play on the gas exchange valve 4 and the gas exchange valve 4 is actuated via the drag lever 8.

Der Zwischenhebel 6 weist ein erstes Rollenorgan 10 auf, welches über eine erste Lagereinheit 12 am Zwischenhebel 6 drehbar gelagert ist und um eine erste Drehachse 11 rotiert. Das erste Rollenorgan 10 ist mit seiner Umfangsfläche mit einer Nocke 15 einer Nockenwelle 14 in Kontakt und überträgt die Nockenwellendrehbewegung auf den Zwischenhebel 6, wobei der Zwischenhebel 6 eine Schwenkbewegung ausführt.The intermediate lever 6 has a first roller member 10, which is rotatably supported via a first bearing unit 12 on the intermediate lever 6 and rotates about a first axis of rotation 11. The first roller member 10 is with its peripheral surface with a cam 15 of a camshaft 14 in contact and transmits the camshaft rotational movement to the intermediate lever 6, wherein the intermediate lever 6 performs a pivoting movement.

Des Weiteren weist der Zwischenhebel 6 ein im Zwischenhebel 6 drehbar gelagertes zweites und drittes Rollenorgan 16, 18 auf, wobei in Figur 1 nur das zweite Rollenorgan 16 gezeigt ist. Beide Rollenorgane 16, 18 rotieren um eine zweite Drehachse 17, wobei die Drehachse 17 zur ersten Drehachse 11 versetzt angeordnet ist. Die beiden Rollenorgane 16, 18 sind jeweils mit einer Steuerwelle 19 und einer Kulisse 20 in Eingriff. Die Steuerwelle 19 ist durch einen nicht weiter dargestellten Aktuator in vordefinierte Stellungen verdrehbar und weist einen Nocken auf, so dass über die Verdrehung der Steuerwelle 19 die Lage des Zwischenhebels 6 und dadurch die Betätigung des Gaswechselventils 4 steuerbar ist. Die Kulisse 20 ist beispielsweise im Zylinderkopf starr angeordnet und dient als Führung des Zwischenhebels 6 während seiner Lagenänderung .Furthermore, the intermediate lever 6 has a rotatably mounted in the intermediate lever 6 second and third roller member 16, 18, wherein in FIG. 1 only the second roller member 16 is shown. Both roller members 16, 18 rotate about a second axis of rotation 17, wherein the axis of rotation 17 is arranged offset from the first axis of rotation 11. The two roller organs 16, 18 are each with a control shaft 19 and a link 20 in engagement. The control shaft 19 is rotatable by an actuator not shown in predefined positions and has a cam, so that on the rotation of the control shaft 19, the position of the intermediate lever 6 and thereby the operation of the gas exchange valve 4 is controllable. The gate 20 is for example arranged rigidly in the cylinder head and serves as a guide of the intermediate lever 6 during its position change.

Figur 2 zeigt eine erste Ausgestaltung und Figur 3 eine zweite Ausgestaltung der Lagerung des zweiten und dritten Rollenorgans 16, 18. Die Figuren 2 und 3 zeigen einen Zwischenhebel 6 mit einem ersten und einem zweiten Schenkel 30, 32. Die Schenkel 30, 32 sind über einen die Arbeitskurvenkontur 22 bildenden Steg 34, eine Achse 36 und eine Hülse 38 bzw. eine Achse 46 miteinander verbunden sind. Auf der Achse 36 ist die Lagereinheit 12 angeordnet, über die das erste Rollenorgan 10 im Zwischenhebel 6 gelagert ist. FIG. 2 shows a first embodiment and FIG. 3 a second embodiment of the storage of the second and third roller member 16, 18. Die Figures 2 and 3 show an intermediate lever 6 having a first and a second leg 30, 32. The legs 30, 32 are connected via a working curve contour 22 forming web 34, an axis 36 and a sleeve 38 and an axle 46 with each other. On the axis 36, the bearing unit 12 is arranged, via which the first roller member 10 is mounted in the intermediate lever 6.

In der ersten Ausgestaltung dient die Hülse 38 als Aufnahme einer Welle 42. An einem ersten Ende der Welle 42 ist das zweite Rollenorgan 16 drehfest mit der Welle 42 verbunden und an einem zweiten Ende der Welle 42 ist das dritte Rollenorgan 18 mit der Welle 42 drehfest verbunden. Zwischen dem zweiten und dem dritten Rollenorgan 16, 18 ist die Welle 42 über eine zweite Lagereinheit 44 in der Hülse drehbar gelagert.In the first embodiment, the sleeve 38 serves as a receptacle of a shaft 42. At a first end of the shaft 42, the second roller member 16 is rotatably connected to the shaft 42 and at a second end of the shaft 42, the third roller member 18 with the shaft 42 rotatably connected. Between the second and the third roller member 16, 18, the shaft 42 is rotatably supported via a second bearing unit 44 in the sleeve.

Entscheidender Unterschied der in Figur 3 gezeigten zweiten Ausgestaltung zu der in Figur 2 gezeigten ersten Ausgestaltung ist, dass anstatt der Hülse 38 eine Achse 46 in dem Zwischenhebel 6 fest angeordnet ist. An den beiden Enden der Achse 46 ist jeweils eine Lagereinheit 48, 50 angeordnet, wobei über die Lagereinheit 48 das zweite Rollenorgan 16 und über die Lagereinheit 50 das dritte Rollenorgan 18 an der Achse 46 drehbar gelagert sind.Decisive difference in FIG. 3 shown second embodiment of the in FIG. 2 shown first embodiment is that instead of the sleeve 38, an axle 46 is fixedly arranged in the intermediate lever 6. At the two ends of the axle 46 are each a bearing unit 48, 50 is arranged, via the bearing unit 48, the second roller member 16 and the bearing unit 50, the third roller member 18 are rotatably mounted on the axle 46.

Eine derartige Anordnung der Rollenorgane 12, 16, 18 führt dazu, dass jedes Rollenorgan 12, 16, 18 in jeweils einer Querebene angeordnet ist und sich die Umfangsflächen der Rollenorgane 12, 16, 18 in Längsrichtung der Welle 42 bzw. der Achse 46 nicht überlagern. Dadurch wird ermöglicht, dass die Nocke 15 der Nockenwelle 14 während der Drehbewegung den Zwischenhebel 6 durchgreift, wobei die Nocke 15 zwischen den beiden Schenkeln 30, 32 verläuft. Auf diese Weise kann die Nockenwelle näher an dem Zwischenhebel 6 angeordnet werden, wodurch der Bauraum des mechanisch steuerbaren Ventiltrieb 2 reduziert wird.Such an arrangement of the roller members 12, 16, 18 causes each roller member 12, 16, 18 is arranged in each case a transverse plane and the peripheral surfaces of the roller members 12, 16, 18 in the longitudinal direction of the shaft 42 and the axis 46 does not overlap , This makes it possible that the cam 15 of the camshaft 14 passes through the intermediate lever 6 during the rotational movement, wherein the cam 15 between the two legs 30, 32 extends. In this way, the camshaft can be arranged closer to the intermediate lever 6, whereby the space of the mechanically controllable valve train 2 is reduced.

Es sollte deutlich sein, dass der Schutzbereich nicht auf dieses Ausführungsbeispiel beschränkt ist, sondern die erfindungsgemäße Anordnung der ersten, zweiten und dritten Rolle auch bei anderen Rollen des mechanisch steuerbaren Ventiltriebs denkbar ist. Der Schutzbereich der vorliegenden Erfindung wird durch die beigefügten Ansprüche definiert.It should be clear that the scope of protection is not limited to this embodiment, but the inventive arrangement of the first, second and third roller is also conceivable in other roles of mechanically controllable valve train. The scope of the present invention is defined by the appended claims.

Claims (4)

  1. Mechanically controllable valve drive having an intermediate lever (6) with
    a first roller element (10) rotating about a first axis of rotation (11) and cooperating with a circumferential contour of a camshaft (14),
    two roller elements (16, 18), in particular a second roller element (16) and a third roller element (18), which rotate about a common second axis of rotation (17) offset in parallel from the first axis of rotation, wherein the second and third roller element (16, 18) each cooperate with a link (20) and a peripheral contour of a control shaft (19), and
    a working cam contour (22) via which the intermediate lever (6) acts on a drag lever (8) of a gas exchange valve (4),
    wherein the first roller element (10) is arranged axially between the second roller element (16) and third roller element (18),
    the intermediate lever (6) has two mutually parallel legs (30, 32), wherein the first roller element (10) is arranged between the two legs (30, 32) and the legs (30, 32) are arranged between the second and third roller element (16, 18) such that a cam (15) of the camshaft (14) passes through the intermediate lever (6) during rotational movement, wherein the cam (15) extends between the two legs (30, 32).
  2. Mechanically controllable valve drive according to claim 1, characterized in that the second roller element (16) and the third roller element (18) are connected via a shaft (42) so as to rotate together and the shaft (42) is supported on the intermediate lever (6) via a bearing unit (44).
  3. Mechanically controllable valve drive according to claim 2, characterized in that the second and third roller elements (16, 18) are connected with the shaft (42) via a press fit.
  4. Mechanically controllable valve drive according to claim 1, characterized in that the second and third roller element (16, 18) are rotatably supported on an axle (46), wherein the axle (46) is fixedly connected to the intermediate lever (6) and the second and third roller element (16, 18) are supported on the axle (46) via a respective bearing unit (48, 50).
EP17192304.8A 2016-11-18 2017-09-21 Mechanically controllable valve drive Active EP3324010B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016122179.1A DE102016122179A1 (en) 2016-11-18 2016-11-18 Mechanically controllable valve train

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EP3324010A1 EP3324010A1 (en) 2018-05-23
EP3324010B1 true EP3324010B1 (en) 2019-10-30

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Application Number Title Priority Date Filing Date
EP17192304.8A Active EP3324010B1 (en) 2016-11-18 2017-09-21 Mechanically controllable valve drive

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EP (1) EP3324010B1 (en)
DE (1) DE102016122179A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519319A1 (en) * 1985-05-30 1986-12-04 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart VARIABLE VALVE CONTROL FOR A PISTON PISTON COMBUSTION ENGINE
DE4301453C2 (en) * 1993-01-20 1995-01-05 Meta Motoren Energietech Variable valve control of internal combustion engines
DE4322480C2 (en) * 1993-07-06 1996-05-02 Meta Motoren Energietech Device for the variable valve control of internal combustion engines
GB2378729A (en) * 2001-08-18 2003-02-19 Mechadyne Plc Adjustable engine valve control system
DE10235403A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
DE102011003898B4 (en) * 2011-02-10 2021-09-09 Schaeffler Technologies AG & Co. KG Intermediate lever
CN103742219B (en) * 2013-12-30 2016-05-11 长城汽车股份有限公司 For the valve actuating mechanism of engine and there is its vehicle
DE102014109573A1 (en) 2014-07-09 2016-01-14 Pierburg Gmbh Mechanically controllable valve train
DE102015118884A1 (en) * 2015-11-04 2017-05-04 Pierburg Gmbh Mechanically controllable valve train

Non-Patent Citations (1)

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Title
None *

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DE102016122179A1 (en) 2018-05-24

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