EP1854967A2 - Cylinder head for a combustion engine with a variable stroke valve operating mechanism - Google Patents

Cylinder head for a combustion engine with a variable stroke valve operating mechanism Download PDF

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Publication number
EP1854967A2
EP1854967A2 EP07006942A EP07006942A EP1854967A2 EP 1854967 A2 EP1854967 A2 EP 1854967A2 EP 07006942 A EP07006942 A EP 07006942A EP 07006942 A EP07006942 A EP 07006942A EP 1854967 A2 EP1854967 A2 EP 1854967A2
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EP
European Patent Office
Prior art keywords
cylinder head
head according
adjusting device
adjusting
variable
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP07006942A
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German (de)
French (fr)
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EP1854967B1 (en
EP1854967A3 (en
Inventor
Johannes Meyer
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP1854967A3 publication Critical patent/EP1854967A3/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
    • F01L13/0021—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 rocker arm ratio
    • 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
    • F01L13/0021—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 rocker arm ratio
    • F01L13/0026—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 rocker arm ratio by means of an eccentric
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/032—Electric motors

Definitions

  • the invention relates to a cylinder head for an internal combustion engine with a variable-stroke valve drive with the features of the preamble of claim 1.
  • the invention is based on the current BMW inline six-cylinder gasoline engine with magnesium crankcase and Valvetronic.
  • Valvetronic is the name for a variable-stroke valve train, as it is for example in the German Offenlegungsschrift DE 101 23 186 A1 is described.
  • the gas exchange valve with the interposition of a transmission element with a movable about a rotation axis roller operatively connected to a, a Leerhubkurve and a lift cam control path, which is arranged in an end region of a stroke of the gas exchange valve controlled by a cam of a camshaft pivot lever.
  • the play-free by means of a spring on a roller cam associated with the pivot lever is the other hand for variable stroke adjustment of the gas exchange valve controlled by means of an adjustment position adjustable and fixable swing fulcrum supported along a circular path.
  • an adjustment position adjustable and fixable swing fulcrum supported along a circular path arranged on a housing part of the engine circular path is provided as a backdrop with a radius "R" about the axis of rotation of the roller of the transmission element for controlled positionally variable support of the pivot lever.
  • the adjusting device is a, arranged on an eccentric shaft gear segment. This gear segment is rotated by means of an adjusting element, an electric motor with a threaded screw.
  • the actuator is arranged geodetically above the variable stroke valve train.
  • the attachment of the actuating element is carried out by means of the valve cover. This arrangement can be seen, for example, from the BMW press release 6/2004 on the new BMW straight-six gasoline engine in pictures P0014646 and P0014647.
  • the adjusting device according to claim 3 is changed either by a linear movement or a rotational movement of the actuating element in the position.
  • the embodiment according to claim 4 is a proven in practice actuator.
  • the actuator can be tempered according to claim 6 of a lubricant or a coolant of the internal combustion engine.
  • FIG. 1 shows a plan view of a section of a cylinder head 1 designed according to the invention of an internal combustion engine (not shown).
  • the width of the section corresponds approximately to the diameter of a cylinder of the internal combustion engine.
  • the cylinder head 1 has two valve trains, a conventional valve train 2 'on an exhaust side and a variable-stroke valve train 2 on an inlet side. Since the exhaust-side valvetrain 2 'is a conventional valvetrain, this is not explained in the context of the present description.
  • the inlet-side, variable-stroke valve drive 2 largely corresponds to that in the DE 101 23 186 A1 described habvariable valve train.
  • a spark plug arranged in a sleeve.
  • a complete cylinder head 1, for example, for a six-cylinder internal combustion engine is composed of six illustrated sections, but waves, such. B. a camshaft 9 ', are provided in common for all sections.
  • roller element is arranged on the pivot lever 3, which is in operative connection with the cam 9.
  • the camshaft 9 Upon rotation of the camshaft 9 'pivots the pivot lever 3 against a spring force of the spring 10 and pushes with its control cam. 6 the gas exchange valve in an open position.
  • the roller element 4 is supported next to the support on the slide track on an adjusting device 11, with a swing fulcrum of the roller element 4 can be moved parallel to the slide track.
  • the adjusting device 11 consists of an eccentric shaft with a gear segment. A displacement of the roller element 4 with an eccentric along the slide track causes a change in the Gas monventilhubes eighth
  • an actuating element 12 is provided, which is arranged according to the invention on the cylinder head 1.
  • the adjusting element 12 consists essentially of an electric machine with a meshing with the gear segment threaded screw 14.
  • a longitudinal axis 12 'of the adjusting element 12 is largely aligned in the direction of a cylinder longitudinal axis.
  • a portion of the control element 12 may also be integrated into the cylinder head 1.
  • the rigidity of the entire adjusting drive is further improved.
  • the adjusting device 11 can be rotated via a linear movement or a rotational movement of the actuating element 12. This can be done, for example, by hydraulic adjustment systems or electromechanical adjustment systems.
  • the electric machine is a brushless electric motor.
  • the adjusting element 12 prefferably be tempered with a lubricant or a coolant of the internal combustion engine in order to minimize thermal elongation within the entire adjustment mechanism.
  • a very compact arrangement in the Cylinder head is achieved when the actuator 12 is disposed between two ignition devices 15.
  • the arrangement of the actuating element 12 in the cylinder head 1 allows a very compact package, since no parts of the actuating element 12 or the necessary adjusting gear, gear segment and screw, project beyond the edges of the cylinder head 1.
  • the installation site offers the possibility of an optimal connection to a cooled with a coolant surface, so that a good cooling or temperature control of the control element 12 is possible.
  • the actuator 12 may also be cooled with a lubricant of the internal combustion engine.
  • no lubricant-tight seal the stator / rotor unit must be provided, as this also runs directly in the lubricant mist. This eliminates the disadvantage of friction of a shaft seal.
  • the actuator 12 can be checked for operability at the initial assembly or repair even with open cylinder head 1, so that in the case of failure, the cost of rework is much lower. For disassembly of a valve cover hood the actuator 12 does not have to be removed.

Abstract

The head (1) has a variable stroke valve drive (2) with an operating lever (3) that is supported on a sliding path (30) of a crank and on an intermediate unit (7). The lever is pivoted against a force of a spring (10) for stroke adjustment between supporting points of a cam (9), and has a rolling unit (4) with an oscillating pivot point that slides parallel to the sliding path by an adjusting device. An actuator (12) e.g. brushless electric motor, with a cooling medium is arranged in the head over the adjusting device, and has a longitudinal axis (12`) aligned in direction of a cylinder axis.

Description

Die Erfindung betrifft einen Zylinderkopf für eine Brennkraftmaschine mit einem hubvariablen Ventiltrieb mit den Merkmalen aus dem Oberbegriff des Patentanspruches 1.The invention relates to a cylinder head for an internal combustion engine with a variable-stroke valve drive with the features of the preamble of claim 1.

Die Erfindung geht von dem aktuellen BMW Reihensechszylinder-Ottomotor mit Magnesium-Kurbelgehäuse und Valvetronic aus. Valvetronic ist hierbei die Bezeichnung für einen hubvariablen Ventiltrieb, wie er beispielsweise in der deutschen Offenlegungsschrift DE 101 23 186 A1 beschrieben ist. Bei der hubvariablen Ventiltriebsvorrichtung steht das Gaswechselventil unter Zwischenschaltung eines Übertragungselementes mit einer um eine Drehachse beweglichen Rolle in Wirkverbindung mit einer, eine Leerhubkurve und eine Hubkurve umfassenden Steuerbahn, die in einem Endbereich eines zur Hubbetätigung des Gaswechselventils von einem Nocken einer Nockenwelle gesteuerten Schwenkhebels angeordnet ist. Der mittels einer Feder über eine Rolle dem Nocken spielfrei zugeordnete Schwenkhebel ist andernends zur variablen Hubverstellung des Gaswechselventils über einen mittels einer Verstelleinrichtung gesteuert lageveränderbaren und fixierbaren Schwingdrehpunkt längs einer Kreisbahn abgestützt. Zur Erzielung einer rein rotatorischen Bewegung bzw. reinen Schwenkbewegung des Schwenkhebels um seinen Schwingdrehpunkt ist eine, an einem Gehäuseteil der Brennkraftmaschine angeordnete Kreisbahn als Kulisse mit einem Radius "R" um die Drehachse der Rolle des Übertragungselementes zur gesteuerten lageveränderbaren Abstützung des Schwenkhebels vorgesehen. Die Verstelleinrichtung ist ein, an einer Exzenterwelle angeordnetes Zahnradsegment. Dieses Zahnradsegment wird mit Hilfe eines Stellelementes, einem Elektromotor mit einer Gewindeschnecke verdreht. Bei der derzeitigen baulichen Ausführung ist das Stellelement geodätisch oberhalb des hubvariablen Ventiltriebs angeordnet. Die Befestigung des Stellelementes erfolgt mit Hilfe des Ventildeckels. Ersichtlich ist diese Anordnung beispielsweise aus der BMW Presseinformation 6/2004 über den neuen BMW Reihensechszylinder-Ottomotor in den Bildern P0014646 und P0014647.The invention is based on the current BMW inline six-cylinder gasoline engine with magnesium crankcase and Valvetronic. Here Valvetronic is the name for a variable-stroke valve train, as it is for example in the German Offenlegungsschrift DE 101 23 186 A1 is described. In the variable-stroke valve drive device, the gas exchange valve with the interposition of a transmission element with a movable about a rotation axis roller operatively connected to a, a Leerhubkurve and a lift cam control path, which is arranged in an end region of a stroke of the gas exchange valve controlled by a cam of a camshaft pivot lever. The play-free by means of a spring on a roller cam associated with the pivot lever is the other hand for variable stroke adjustment of the gas exchange valve controlled by means of an adjustment position adjustable and fixable swing fulcrum supported along a circular path. To achieve a purely rotational movement or pure pivoting movement of the pivot lever about its swing pivot point, arranged on a housing part of the engine circular path is provided as a backdrop with a radius "R" about the axis of rotation of the roller of the transmission element for controlled positionally variable support of the pivot lever. The adjusting device is a, arranged on an eccentric shaft gear segment. This gear segment is rotated by means of an adjusting element, an electric motor with a threaded screw. In the current structural design, the actuator is arranged geodetically above the variable stroke valve train. The attachment of the actuating element is carried out by means of the valve cover. This arrangement can be seen, for example, from the BMW press release 6/2004 on the new BMW straight-six gasoline engine in pictures P0014646 and P0014647.

Auch wenn die Serienausgestaltung prinzipiell keinen Nachteil aufweist, ist es aus Packagegründen wünschenswert, die Baugröße eines gattungsgemäßen Ventiltriebes zu verringern.Although the series design has in principle no disadvantage, it is desirable for package reasons to reduce the size of a generic valve train.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale im kennzeichnenden Teil des Patentanspruches 1 gelöst.This object is achieved by the features in the characterizing part of claim 1.

In vorteilhafter Weise wird durch die vorgeschlagene Ausgestaltung nicht nur die Baugröße des Zylinderkopfes reduziert, sondern darüber hinaus die Steifigkeit der Anbindung des Stellelementes an die Verstelleinrichtung verbessert.Advantageously, not only the size of the cylinder head is reduced by the proposed embodiment, but also improves the rigidity of the connection of the actuating element to the adjusting device.

Durch die Ausgestaltung gemäß Patentanspruch 2 wird die Steifigkeit des gesamten Verstellantriebes, bestehend aus dem Stellelement und der Verstelleinrichtung, nochmals verbessert.Due to the configuration according to claim 2, the rigidity of the entire adjusting drive, consisting of the adjusting element and the adjusting device, further improved.

In bevorzugter Weise wird die Verstelleinrichtung gemäß Patentanspruch 3 entweder durch eine Linearbewegung oder eine Drehbewegung des Stellelementes in der Lage verändert.Preferably, the adjusting device according to claim 3 is changed either by a linear movement or a rotational movement of the actuating element in the position.

Die Ausgestaltung gemäß Patentanspruch 4 ist ein in der Praxis bewährtes Stellelement.The embodiment according to claim 4 is a proven in practice actuator.

Bei Verwendung eines bürstenlosen Elektromotors gemäß Patentanspruch 5 muss keine öldichte Abdichtung der Stator-/Rotoreinheit vorgesehen werden, da diese auch direkt im Ölnebel läuft. Damit entfällt der Reibungsnachteil eines Wellendichtringes.When using a brushless electric motor according to claim 5, no oil-tight seal the stator / rotor unit must be provided, as this also runs directly in the oil mist. This eliminates the disadvantage of friction of a shaft seal.

Um Längenänderungen aufgrund von Temperaturänderungen im Verstellantrieb möglichst gering zu halten, kann das Stellelement gemäß Patentanspruch 6 von einem Schmiermittel oder einem Kühlmittel der Brennkraftmaschine temperiert werden.To keep length changes due to temperature changes in the adjustment as low as possible, the actuator can be tempered according to claim 6 of a lubricant or a coolant of the internal combustion engine.

Im Folgenden ist die Erfindung anhand eines bevorzugten Ausführungsbeispieles in einer einzigen Figur näher erläutert.

Figur 1
zeigt eine Aufsicht auf einen Abschnitt eines erfindungsgemäß ausgestalteten Zylinderkopfes.
In the following the invention with reference to a preferred embodiment in a single figure is explained in more detail.
FIG. 1
shows a plan view of a portion of an inventively designed cylinder head.

Figur 1 zeigt eine Aufsicht auf einen Abschnitt eines erfindungsgemäß ausgestalteten Zylinderkopfes 1 einer nicht gezeigten Brennkraftmaschine. Die Breite des Abschnittes entspricht in etwa dem Durchmesser eines Zylinders der Brennkraftmaschine. Der Zylinderkopf 1 verfügt über zwei Ventiltriebe, einen konventionellen Ventiltrieb 2' auf einer Auslassseite sowie einen hubvariablen Ventiltrieb 2 auf einer Einlassseite. Da es sich bei dem auslassseitigen Ventiltrieb 2' um einen konventionellen Ventiltrieb handelt, wird dieser im Rahmen der vorliegenden Beschreibung nicht näher erläutert. Der einlassseitige, hubvariable Ventiltrieb 2 entspricht weitgehend dem in der DE 101 23 186 A1 beschriebenen habvariablen Ventiltrieb. Zwischen dem einlassseitigen hubvariablen Ventiltrieb 2 und dem auslassseitigen Ventiltrieb 2' ist eine Zündanordnung 15, eine Zündkerze, in einer Hülse angeordnet. Ein vollständiger Zylinderkopf 1, beispielsweise für eine sechszylindrige Brennkraftmaschine, setzt sich aus sechs dargestellten Abschnitten zusammen, wobei jedoch Wellen, wie z. B. eine Nockenwelle 9', gemeinsam für alle Abschnitte vorgesehen sind.FIG. 1 shows a plan view of a section of a cylinder head 1 designed according to the invention of an internal combustion engine (not shown). The width of the section corresponds approximately to the diameter of a cylinder of the internal combustion engine. The cylinder head 1 has two valve trains, a conventional valve train 2 'on an exhaust side and a variable-stroke valve train 2 on an inlet side. Since the exhaust-side valvetrain 2 'is a conventional valvetrain, this is not explained in the context of the present description. The inlet-side, variable-stroke valve drive 2 largely corresponds to that in the DE 101 23 186 A1 described habvariable valve train. Between the inlet-side variable-stroke valve drive 2 and the outlet-side valve drive 2 'is an ignition assembly 15, a spark plug, arranged in a sleeve. A complete cylinder head 1, for example, for a six-cylinder internal combustion engine is composed of six illustrated sections, but waves, such. B. a camshaft 9 ', are provided in common for all sections.

Im Folgenden ist die Funktionsweise des hubvariablen Ventiltriebs 2 kurz dargestellt:

  • Der hubvariable Ventiltrieb 2 besteht im Wesentlichen aus einem Schwenkhebel 3 mit einem Rollenelement 4, sowie einer Kulisse 5 mit einer Kulissenbahn, einem Zwischenelement 7, einem Gaswechselventil 8, einem Nocken 9, der auf einer Nockenwelle 9' angeordnet ist, sowie einer Feder 10 und einer Verstelleinrichtung 11. Der Schwenkhebel 3 stützt sich einerseits über das Rollenelement 4 auf der Kulissenbahn der Kulisse 5 und andererseits mit einer Steuerbahn 6 auf dem Zwischenelement 7 ab. Das Zwischenelement 7 ist ein Rollenschlepphebel, dessen Rolle um eine Drehachse drehbar ist. Die Drehachse ist gleichzeitig der Mittelpunkt der Kulissenbahn entsprechend einer Nullhubstellung. Das Zwischenelement 7 stützt sich einerseits der Rolle auf einem Spielausgleichselement 16, hier einem hydraulischen Ventilspielausgleichselement und andererseits auf dem Gaswechselventil 8 ab.
The mode of operation of the variable-stroke valve drive 2 is briefly described below:
  • The stroke variable valve train 2 consists essentially of a pivot lever 3 with a roller element 4, and a gate 5 with a slide track, an intermediate element 7, a gas exchange valve 8, a cam 9, which is arranged on a camshaft 9 ', and a spring 10 and an adjusting device 11. The pivot lever 3 is based on the one hand on the roller element 4 on the slide track of the gate 5 and on the other hand with a control track 6 on the intermediate element 7 from. The intermediate element 7 is a roller rocker arm whose roller is rotatable about a rotation axis. The axis of rotation is also the center of the slide track according to a zero stroke position. The intermediate element 7 is supported on the one hand of the roller on a clearance compensation element 16, here a hydraulic valve clearance compensation element and on the other hand on the gas exchange valve 8.

Zwischen der Steuerbahn 6 und dem Rollenelement 4 ist an den Schwenkhebel 3 ein weiteres, in Fig. 1 ebenfalls nicht erkennbares Rollenelement angeordnet, welches mit dem Nocken 9 in Wirkverbindung steht. Bei Drehung der Nockenwelle 9' schwenkt der Schwenkhebel 3 entgegen einer Federkraft der Feder 10 und drückt mit seiner Steuerkurve 6 das Gaswechselventil in eine Öffnungsstellung. Das Rollenelement 4 ist neben der Abstützung auf der Kulissenbahn weiter an einer Verstelleinrichtung 11 abgestützt, mit der ein Schwingdrehpunkt des Rollenelements 4 parallel zur Kulissenbahn verschoben werden kann. Die Verstelleinrichtung 11 besteht aus einer Exzenterwelle mit einem Zahnradsegment. Eine Verschiebung des Rollenelementes 4 mit einem Exzenter entlang der Kulissenbahn bewirkt eine Veränderung des Gaswechselventilhubes 8.Between the control track 6 and the roller element 4, another, not visible in FIG. 1 roller element is arranged on the pivot lever 3, which is in operative connection with the cam 9. Upon rotation of the camshaft 9 'pivots the pivot lever 3 against a spring force of the spring 10 and pushes with its control cam. 6 the gas exchange valve in an open position. The roller element 4 is supported next to the support on the slide track on an adjusting device 11, with a swing fulcrum of the roller element 4 can be moved parallel to the slide track. The adjusting device 11 consists of an eccentric shaft with a gear segment. A displacement of the roller element 4 with an eccentric along the slide track causes a change in the Gaswechselventilhubes eighth

Zur Verstellung der Verstelleinrichtung 11 ist ein Stellelement 12 vorgesehen, welches erfindungsgemäß am Zylinderkopf 1 angeordnet ist. Das Stellelement 12 besteht im Wesentlichen aus einer Elektromaschine mit einer mit dem Zahnradsegment kämmenden Gewindeschnecke 14. Eine Längsachse 12' des Stellelementes 12 ist weitgehend in Richtung einer Zylinderlängsachse ausgerichtet.To adjust the adjusting device 11, an actuating element 12 is provided, which is arranged according to the invention on the cylinder head 1. The adjusting element 12 consists essentially of an electric machine with a meshing with the gear segment threaded screw 14. A longitudinal axis 12 'of the adjusting element 12 is largely aligned in the direction of a cylinder longitudinal axis.

In einer weiteren Ausführungsform kann ein Abschnitt des Stellelementes 12 auch in den Zylinderkopf 1 integriert sein. Mit dieser Ausgestaltungsvariante wird die Steifheit des gesamten Verstellantriebes nochmals verbessert. Ebenfalls in weiteren Ausführungsbeispielen kann die Verstelleinrichtung 11 über eine lineare Bewegung oder eine Drehbewegung des Stellelementes 12 verdreht werden. Dies kann beispielsweise durch hydraulische Verstellsysteme oder elektromechanische Verstellsysteme erfolgen. In einer weiteren vorteilhaften Ausgestaltung ist im Falle eines elektromechanischen Verstellsystems die Elektromaschine ein bürstenloser Elektromotor.In a further embodiment, a portion of the control element 12 may also be integrated into the cylinder head 1. With this embodiment variant, the rigidity of the entire adjusting drive is further improved. Also in further embodiments, the adjusting device 11 can be rotated via a linear movement or a rotational movement of the actuating element 12. This can be done, for example, by hydraulic adjustment systems or electromechanical adjustment systems. In a further advantageous embodiment, in the case of an electromechanical adjustment system, the electric machine is a brushless electric motor.

Auch ist es in weiteren Ausführungsformen möglich, das Stellelement 12 mit einem Schmiermittel oder einem Kühlmittel der Brennkraftmaschine zu temperieren, um Wärmelängungen innerhalb des gesamten Verstellmechanismus zu minimieren. Eine sehr kompakte Anordnung im Zylinderkopf wird erzielt, wenn das Stellelement 12 zwischen zwei Zündeinrichtungen 15 angeordnet ist.It is also possible in other embodiments, the adjusting element 12 to be tempered with a lubricant or a coolant of the internal combustion engine in order to minimize thermal elongation within the entire adjustment mechanism. A very compact arrangement in the Cylinder head is achieved when the actuator 12 is disposed between two ignition devices 15.

Die Anordnung des Stellelementes 12 im Zylinderkopf 1 ermöglicht ein sehr kompaktes Package, da keinerlei Teile des Stellelementes 12 oder des notwendigen Stellgetriebes, Zahnradsegment und Gewindeschnecke, über die Berandungen des Zylinderkopfes 1 hinausragen. Der Montageort bietet die Möglichkeit einer optimalen Anbindung an eine mit einem Kühlmittel gekühlte Oberfläche, damit ist eine gute Kühlung bzw. Temperierung des Stellelementes 12 möglich. Bei Bedarf kann das Stellelement 12 auch mit einem Schmiermittel der Brennkraftmaschine gekühlt werden. Bei Verwendung eines bürstenlosen Elektromotors als Stellelement 12 muss keine schmiermitteldichte Abdichtung der Stator-/Rotoreinheit vorgesehen werden, da diese auch direkt im Schmiermittelnebel läuft. Damit entfällt der Reibungsnachteil eines Wellendichtringes. Das Stellelement 12 kann bei der Erstmontage oder im Reparaturfall auch noch bei offenem Zylinderkopf 1 direkt auf Funktionsfähigkeit überprüft werden, damit ist im Fehlerfall der Aufwand für eine Nacharbeit wesentlich geringer. Für die Demontage einer Ventildeckelhaube muss das Stellelement 12 nicht entfernt werden.The arrangement of the actuating element 12 in the cylinder head 1 allows a very compact package, since no parts of the actuating element 12 or the necessary adjusting gear, gear segment and screw, project beyond the edges of the cylinder head 1. The installation site offers the possibility of an optimal connection to a cooled with a coolant surface, so that a good cooling or temperature control of the control element 12 is possible. If necessary, the actuator 12 may also be cooled with a lubricant of the internal combustion engine. When using a brushless electric motor as an actuator 12 no lubricant-tight seal the stator / rotor unit must be provided, as this also runs directly in the lubricant mist. This eliminates the disadvantage of friction of a shaft seal. The actuator 12 can be checked for operability at the initial assembly or repair even with open cylinder head 1, so that in the case of failure, the cost of rework is much lower. For disassembly of a valve cover hood the actuator 12 does not have to be removed.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

1.1.
Zylinderkopfcylinder head
2.Second
hubvariabler Ventiltriebvariable stroke valve train
2'2 '
Ventiltriebvalve train
3.Third
Schwenkhebelpivoting lever
4.4th
Rollenelementroller element
5.5th
Kulissescenery
6.6th
Steuerbahncontrol track
7.7th
Zwischenelementintermediate element
8.8th.
GaswechselventilGas exchange valve
9.9th
Nockencam
9.9th
Nockenwellecamshaft
10.10th
Federfeather
11.11th
Verstelleinrichtungadjustment
12.12th
Stellelementactuator
12'12 '
Längsachselongitudinal axis
13.13th
Kurvenscheibecam
14.14th
Gewindeschneckethreaded screw
15.15th
Zündeinrichtungignition device
16.16th
SpielausgleichselementLash adjuster

Claims (7)

Zylinderkopf (1) für eine Brennkraftmaschine mit zumindest zwei Zylindern und mit einem hubvariablen Ventiltrieb (2) mit einem Schwenkhebel (3), der einerseits mit einem Rollenelement (4) mit einem Schwingdrehpunkt auf einer Kulissenbahn einer Kulisse (5) und andererseits mit einer Steuerbahn (6) auf einem Zwischenelement (7) zu einem Gaswechselventil (8) spielfrei abgestützt ist, wobei der Schwenkhebel (3) zur Hubeinstellung zwischen den Abstützpunkten einerseits von einem Nocken (9) einer Nockenwelle (9') entgegen einer Kraft einer Feder (10) gesteuert schwenkbar und andererseits der Schwingdrehpunkt von einer Verstelleinrichtung (11) zur Hubhöhenverstellung parallel zur Kulissenbahn (5') gesteuert verschiebbar ist, wobei die Verstelleinrichtung (11) von einem geodätisch über dem Ventiltrieb angeordneten Stellelement (12) in ihrer Lage veränderbar ist,
dadurch gekennzeichnet, dass das Stellelement (12) an den Zylinderkopf (1) angeordnet ist, wobei eine Längsachse (12') des Stellelementes (12) weitgehend in Richtung einer Zylinderachse ausgerichtet ist.Cylinder head (1) for an internal combustion engine with at least two cylinders and with a variable-stroke valve drive (2) with a pivot lever (3), on the one hand with a roller element (4) with a swing fulcrum on a link path of a link (5) and on the other hand with a control track (6) on an intermediate element (7) to a gas exchange valve (8) is supported without play, wherein the pivot lever (3) for stroke adjustment between the support points on the one hand by a cam (9) of a camshaft (9 ') against a force of a spring (10 Controlled pivotally and on the other hand, the oscillating pivot point of an adjusting device (11) for lifting height parallel to the guide path (5 ') is displaced controlled, wherein the adjusting device (11) by a geodetically arranged over the valve gear actuator (12) is variable in position,
characterized in that the adjusting element (12) to the cylinder head (1) is arranged, wherein a longitudinal axis (12 ') of the adjusting element (12) is oriented substantially in the direction of a cylinder axis. Zylinderkopf nach Patentanspruch 1,
dadurch gekennzeichnet, dass ein Abschnitt des Stellelementes (12) in den Zylinderkopf (1) integriert ist.Cylinder head according to claim 1,
characterized in that a portion of the adjusting element (12) in the cylinder head (1) is integrated. Zylinderkopf nach Patentanspruch 1 oder 2,
dadurch gekennzeichnet, dass die Verstelleinrichtung (11) über eine Linearbewegung oder eine Drehbewegung des Stellelementes (12) in ihrer Lage veränderbar ist.Cylinder head according to claim 1 or 2,
characterized in that the adjusting device (11) via a linear movement or a rotational movement of the adjusting element (12) is variable in their position. Zylinderkopf nach einem der Patentansprüche 1 bis 3, wobei die Verstelleinrichtung (11) eine über ein Zahnradsegment (12) verdrehbare Kurvenscheibe (13) ist,
dadurch gekennzeichnet, dass das Stellelement (12) eine Elektromaschine mit einer mit dem Zahnradsegment (12) kämmenden Gewindeschnecke (14) ist.Cylinder head according to one of the claims 1 to 3, wherein the adjusting device (11) is a cam disc (13) which can be rotated via a gear segment (12),
characterized in that the actuating element (12) is an electric machine with a with the gear segment (12) meshing screw thread (14). Zylinderkopf nach Patentanspruch 4,
dadurch gekennzeichnet, dass die Elektromaschine ein bürstenloser Elektromotor ist.Cylinder head according to claim 4,
characterized in that the electric machine is a brushless electric motor. Zylinderkopf nach einem der zuvor genannten Patentansprüche,
dadurch gekennzeichnet, dass das Stellelement (12) von einem Schmiermittel oder einem Kühlmittel der Brennkraftmaschine temperierbar ist.Cylinder head according to one of the aforementioned claims,
characterized in that the adjusting element (12) can be tempered by a lubricant or a coolant of the internal combustion engine. Zylinderkopf nach Patentanspruch einem der zuvor genannten Patentansprüche, wobei jedem Zylinder eine im Zylinderkopf (1) angeordnete Zündeinrichtung (15) zugeordnet ist,
dadurch gekennzeichnet, dass das Stellelement (12) zwischen zwei Zündeinrichtungen (15) angeordnet ist.Cylinder head according to claim one of the aforementioned claims, wherein each cylinder in the cylinder head (1) arranged ignition device (15) is associated,
characterized in that the adjusting element (12) between two ignition devices (15) is arranged.
EP20070006942 2006-05-13 2007-04-03 Cylinder head for a combustion engine with a variable stroke valve operating mechanism Active EP1854967B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610022481 DE102006022481A1 (en) 2006-05-13 2006-05-13 Cylinder head for an internal combustion engine with a variable-stroke valve drive

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EP1854967A2 true EP1854967A2 (en) 2007-11-14
EP1854967A3 EP1854967A3 (en) 2010-03-24
EP1854967B1 EP1854967B1 (en) 2012-08-15

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EP2568132A1 (en) * 2011-09-07 2013-03-13 Bayerische Motoren Werke Aktiengesellschaft Double leg spring for a variable stroke valve drive in a cylinder head of a combustion engine
DE102008057135B4 (en) * 2008-11-13 2020-11-12 Audi Ag Internal combustion engine with a valve train having a roller rocker arm

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DE102008057135B4 (en) * 2008-11-13 2020-11-12 Audi Ag Internal combustion engine with a valve train having a roller rocker arm
EP2568132A1 (en) * 2011-09-07 2013-03-13 Bayerische Motoren Werke Aktiengesellschaft Double leg spring for a variable stroke valve drive in a cylinder head of a combustion engine

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EP1854967A3 (en) 2010-03-24
DE102006022481A1 (en) 2007-11-15

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