EP1255027A1 - Mechanic control of variable lift of an intake valve of an internal combustion engine - Google Patents
Mechanic control of variable lift of an intake valve of an internal combustion engine Download PDFInfo
- Publication number
- EP1255027A1 EP1255027A1 EP01110782A EP01110782A EP1255027A1 EP 1255027 A1 EP1255027 A1 EP 1255027A1 EP 01110782 A EP01110782 A EP 01110782A EP 01110782 A EP01110782 A EP 01110782A EP 1255027 A1 EP1255027 A1 EP 1255027A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- internal combustion
- combustion engine
- lifting lever
- lifting
- 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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/1828—Cam, lever, and slide
Definitions
- the present invention relates to a mechanically controllable valve lift adjustment.
- the present invention further relates to an internal combustion engine with a mechanical adjustable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines.
- a vacuum occurs when the load changes from full to partial load in the intake system, through which more fuel than is required in the cylinders is sucked. This increases the fuel consumption of the internal combustion engine, and unburned fuel may leak into the environment.
- the object is therefore to provide a device with which the fuel consumption of an internal combustion engine can be reduced.
- valve lift adjustment according to the invention additionally a roller rocker arm, which on the one hand matches the working curve of the Lever cooperates and is driven by this and on the other hand with the valve cooperates and moves it.
- the valve lift adjustment has a means with which the lift lever is rotatable and slidably mounted in a backdrop. This is preferably Means a role.
- the backdrop takes up the means and thus represents its leadership, within which the means and with it the lifting lever moves under pressure and / or tension.
- the backdrop can have any shape that is chosen by the person skilled in the art that the lifting lever preferably along a certain straight line and / or curve is movable.
- the backdrop preferably has a substantially rectangular shape, whereby the short sides of the rectangle are preferably designed in the form of a semicircle are. This shape of the backdrop is particularly suitable for holding roles.
- This backdrop can be horizontal or vertical or at any angle Be arranged horizontally or vertically.
- the internal combustion engine has at least two cylinders, wherein at least one lifting lever is assigned to each cylinder. These are lifting levers through a driven bar located in the housing of the internal combustion engine Slidably mounted is changed in position to increase the stroke of the cylinder adjust.
- the bar is preferably forward and along a straight line moved back.
- a cylinder two intake valves and accordingly two lifting levers.
- These two lifting levers can according to the invention either with a driven bar or with two driven strips are moved, in the latter case one each Lifting lever is moved by a bar.
- the latter embodiment has the Advantage that the lifting lever and thus the valves are adjusted independently of each other can be, making the control of the internal combustion engine even more variable can be done. In extreme cases, a so-called 0-stroke is implemented for a valve, while the other valve is fully opened.
- the bar can be driven in any manner familiar to the person skilled in the art.
- the drive is hydraulic or pneumatic, with a electric solenoid, with an electric motor, preferably a gear has or with a piezomotor.
- the means that cooperate with the camshaft is a roller.
- valve control according to the invention is suitable for valves of any kind.
- the valves are valves of internal combustion engines, particularly preferred Intake valves for internal combustion engines.
- Another object of the present invention therefore relates to an internal combustion engine, which has at least one valve control according to the invention.
- Another object of the present invention is a method for control of the stroke of an intake valve of an internal combustion engine using the Valve control according to the invention, in which at least two lifting levers with one driven bar according to the performance requirement of the Internal combustion engine to be moved in the backdrop.
- the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact, which reduces the stroke of the valve causes.
- the lifting lever At full load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact with the maximum stroke of the valve causes.
- the present invention has the advantage that the valve lift depending on the performance requirement can be increased or decreased.
- Valve stroke adjustment reduces the gas exchange work in Otto engines and it This results in fuel savings of up to 10% compared to valve control according to the state of the art.
- the mechanical control is much easier and thus cheaper to produce than z.
- the valve control according to the invention is very robust and not maintenance-prone. By using a bar that holds the lift levers in place moves, far fewer components are required than in the prior art.
- Figure 1a shows the valve control according to the invention for a two-valve cylinder.
- Figure 1b shows an embodiment of the mounting of the lifting lever in a four-valve cylinder.
- Figure 2 shows a further embodiment of the mounting of the lifting lever in a four-valve cylinder.
- Figure 3 shows a parallelogram for the drive of the bar.
- Figure 4 shows two actuators for driving the bar
- Figure 5 shows two actuators for driving the bar with a power balance 32
- FIG. 1a the valve control according to the invention for a two-valve engine (an intake and an exhaust valve) is shown.
- a lifting lever 4 is slidably and rotatably mounted with the roller 30 in a link 5.
- the lifting lever is moved by the bar 8 and the return spring 14 in the backdrop.
- the backdrop 5 and the mounting or guidance of the strip 8 are integrated in a cover 11 of the engine, which is mounted precisely aligned on the cylinder head 13 or an intermediate carrier 12.
- the person skilled in the art understands that the lifting lever 4 can also be held in a specific position within the setting by the strip 8 and the return spring 14.
- the strip 8 extends perpendicular to the plane of the paper along all of the cylinders or their intake valve which are arranged in a row in the engine.
- the position of the bar 8 is detected by a displacement sensor (not shown) or, for example, by the revolutions of an electric motor that drives the bar and transmitted to an electronic control unit as the actual value.
- This control unit controls the desired position of the intake valve based on a setpoint / actual value comparison.
- the lifting lever 4 has a further roller 31, which is connected to the camshaft 28 cooperates and drives the lifting lever 4.
- the lifting lever 4 has a working curve 6. This work curve is in contact with the roller 7, which is attached to the roller rocker arm 1. The Roller rocker arm 1 in turn moves the valve 3 (partially shown).
- the left part of the work curve is a circle around the center of the role Roll 30. This ensures a zero stroke in the position shown.
- the transition from the left (zero stroke range) to the right (stroke range) of the working curve defines the acceleration ramp of the intake valve movement.
- the acceleration ramp of the camshaft 28 now only serves to accelerate the lifting lever 4 and no longer acts on the valve acceleration.
- Figure 1b shows the detail of a four-valve engine (two intake and two exhaust valves).
- the engine has two intake valves per cylinder, the stroke behavior of which is regulated independently of one another by the two lift levers 4a, 4b, only the lift lever 4a being shown.
- the strip 8 can be divided into two, which is represented by the strips 15, 16.
- the strips 15, 16 are driven independently of one another.
- the valve strokes of the two intake valves can be controlled independently of each other.
- an inlet valve can be set to the 0 stroke and only the valve stroke of the other valve can be used for torque control.
- the position of the respective bar 15, 16 is detected and used for control.
- the strips 15, 16 also extend over all cylinders which are arranged in a row or their valves, the stroke of which changes the respective strip.
- Figure 2 shows a further embodiment of the mounting of the lifting levers 4a, 4b in a four-valve cylinder.
- the two lifting levers 4a, 4b are rotatably mounted on a common axis 17.
- the axis 17 in turn is rotatably supported in a roller bearing 18.
- the roller bearing 18 can be moved along the backdrop 5 by the bar 8.
- the bar 8 is not divided into two.
- the axis 17 can also extend over all cylinders, so that all lifting levers on are lined up one axis and z. B. by spacers in the valve position being held.
- Figure 3 shows a possible drive form of the strips 8 or strips 15, 16, which in the present example is a parallelogram formed by the strips 8 and 19 and the two levers 21.
- the strips 8 and 19 and the levers 21 are rotatably connected to one another in the plane of the paper, with at least two levers being used in a four-cylinder engine and three or more levers 21 in a six-cylinder engine.
- the bar 19 is mounted so that it can be displaced in both directions along the horizontal, which is indicated by the double arrow 20.
- the bearings 22, which are located in the cylinder head, can be plain or roller bearings.
- the strip 8 is guided through the bearings 23 in the cylinder head along a vertical line and its position can be determined by displacement sensors.
- the bar 19 is adjusted by a motor 24 and a screw thread.
- the position of the bar 8 and thus the set stroke of the intake valve can be measured by a displacement sensor 25, which detects the position of the bar 19.
- the position of the strip 8 can also be measured by detecting the engine revolutions.
- many other means for example a hydraulic system, a lifting magnet, a stepping motor, a mechanically operated lever or a cable pull, are suitable for bringing about the adjustment of the bar 19.
- the horizontal movement 20 of the bar 19 is supported by the springs 24 and 25.
- FIG. 4 shows the drive of the bar 8 by at least two actuators 27.
- actuators 27 can be, for example, lifting magnets, electric motors with or without a gear, piezomotors or mechanical, hydraulic or pneumatic means.
- FIG. 5 also shows a force balance 32 which interacts with the actuators 27. This arrangement increases the accuracy of the idle valve stroke.
Abstract
Die vorliegende Erfindung betrifft eine mechanisch regelbare Ventilhubverstellung. Die vorliegende Erfindung betrifft ferner einen Verbrennungsmotor mit einer mechanisch regelbaren Ventilhubverstellung und ein Verfahren zum Regeln der Ventilhübe in Verbrennungsmotoren. <IMAGE>The present invention relates to a mechanically controllable valve lift adjustment. The present invention further relates to an internal combustion engine with a mechanically controllable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines. <IMAGE>
Description
Die vorliegende Erfindung betrifft eine mechanisch regelbare Ventilhubverstellung. Die vorliegende Erfindung betrifft ferner einen Verbrennungsmotor mit einer mechanisch regelbaren Ventilhubverstellung und ein Verfahren zum Regeln der Ventilhübe in Verbrennungsmotoren.The present invention relates to a mechanically controllable valve lift adjustment. The present invention further relates to an internal combustion engine with a mechanical adjustable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines.
Bei Verbrennungsmotoren tritt bei einem Lastwechsel von Voll- auf Teillast ein Unterdruck in der Sauganlage auf, durch den mehr Kraftstoff als benötigt in die Zylinder gesaugt wird. Dadurch erhöht sich der Kraftstoffverbrauch des Verbrennungsmotors, und es gelangt gegebenenfalls unverbrannter Kraftstoff in die Umwelt.In internal combustion engines, a vacuum occurs when the load changes from full to partial load in the intake system, through which more fuel than is required in the cylinders is sucked. This increases the fuel consumption of the internal combustion engine, and unburned fuel may leak into the environment.
Es besteht deshalb die Aufgabe, eine Vorrichtung zur Verfügung zu stellen, mit der der Kraftstoffverbrauch eines Verbrennungsmotors reduziert werden kann.The object is therefore to provide a device with which the fuel consumption of an internal combustion engine can be reduced.
Diese Aufgabe wird durch die Bereitstellung einer mechanisch regelbaren Ventilhubverstellung für eine Brennkraftmaschine, die mehrere Zylinder aufweist, mit:
- Mindestens einem Hubhebel pro Zylinder, der
- ein Mittel, mit dem der Hubhebel drehbar und in einer Kulisse verschieblich gelagert ist,
- ein Antriebsübertragungsmittel, das mit einer Nockenwelle, die den Hubhebel antreibt, zusammenwirkt und
- eine Arbeitskurve
- Einem Mittel, das mit der verschieblichen, drehbaren Lagerung der Hubhebel zusammenwirkt und diese in den Kulissen verschiebt,
- Einer Nockenwelle, die mit dem Antriebsübertragungsmittel des Hubhebels zusammenwirkt und diesen antreibt,
- Mindestens einem Ventil pro Zylinder, das mit der Arbeitskurve jeweils eines Hubhebels zusammenwirkt und von diesem bewegt wird,
- wobei das Mittel, das den Hubhebel verschiebt eine angetriebene Leiste ist, die in dem Gehäuse der Brennkraftmaschine verschieblich gelagert ist,
- At least one lifting lever per cylinder, the
- a means with which the lifting lever is rotatably and displaceably mounted in a backdrop,
- a drive transmission means which cooperates with a camshaft which drives the lifting lever and
- a working curve
- A means that interacts with the movable, rotatable mounting of the lifting levers and moves them in the scenes,
- A camshaft, which interacts with the drive transmission means of the lifting lever and drives it,
- At least one valve per cylinder, which interacts with the working curve of a lifting lever and is moved by this,
- wherein the means that moves the lifting lever is a driven bar that is slidably mounted in the housing of the internal combustion engine,
In einer anderen Ausführungsform weist die erfindungsgemäße Ventilhubverstellung zusätzlich einen Rollenschlepphebel auf, der einerseits mit der Arbeitskurve des Hubhebels zusammenwirkt und von diesem angetrieben wird und andererseits mit dem Ventil zusammenwirkt und dieses bewegt.In another embodiment, the valve lift adjustment according to the invention additionally a roller rocker arm, which on the one hand matches the working curve of the Lever cooperates and is driven by this and on the other hand with the valve cooperates and moves it.
Erfindungsgemäß weist die Ventilhubverstellung ein Mittel auf, mit dem der Hubhebel drehbar und in einer Kulisse verschieblich gelagert ist. Vorzugsweise ist dieses Mittel eine Rolle.According to the invention, the valve lift adjustment has a means with which the lift lever is rotatable and slidably mounted in a backdrop. This is preferably Means a role.
Die Kulisse nimmt das Mittel auf und stellt somit dessen Führung dar, innerhalb derer sich das Mittel und mit ihm der Hubhebel unter Druck und/oder Zug verschiebt. Die Kulisse kann eine beliebige Form aufweisen, die vom Fachmann so gewählt wird, daß der Hubhebel vorzugsweise entlang einer bestimmten Geraden und/oder Kurve verschiebbar ist.The backdrop takes up the means and thus represents its leadership, within which the means and with it the lifting lever moves under pressure and / or tension. The The backdrop can have any shape that is chosen by the person skilled in the art that the lifting lever preferably along a certain straight line and / or curve is movable.
Vorzugsweise hat die Kulisse jedoch eine im wesentlichen rechteckige Form, wobei die kurzen Seiten des Rechtecks vorzugsweise in Form eines Halbkreises gestaltet sind. Diese Form der Kulisse eignet sich insbesondere zur Aufnahme von Rollen. Diese Kulisse kann horizontal oder vertikal oder in einem beliebigen Winkel zur Horizontalen bzw. Vertikalen angeordnet sein.However, the backdrop preferably has a substantially rectangular shape, whereby the short sides of the rectangle are preferably designed in the form of a semicircle are. This shape of the backdrop is particularly suitable for holding roles. This backdrop can be horizontal or vertical or at any angle Be arranged horizontally or vertically.
Erfindungsgemäß weist die Brennkraftmaschine mindestens zwei Zylinder auf, wobei jedem Zylinder mindestens ein Hubhebel zugeordnet ist. Diese Hubhebel werden durch eine angetriebene Leiste, die in dem Gehäuse der Brennkraftmaschine verschieblich gelagert ist in ihrer Lage verändert, um den Hub der Zylinder zu verstellen. Vorzugsweise wird die Leiste entlang einer Geraden vor- und zurückbewegt.According to the invention, the internal combustion engine has at least two cylinders, wherein at least one lifting lever is assigned to each cylinder. These are lifting levers through a driven bar located in the housing of the internal combustion engine Slidably mounted is changed in position to increase the stroke of the cylinder adjust. The bar is preferably forward and along a straight line moved back.
In einer bevorzugten Ausführungsform der vorliegenden Erfindung weist ein Zylinder zwei Einlaßventile und dementsprechend zwei Hubhebel auf. Diese beiden Hubhebel können erfindungsgemäß entweder mit einer angetriebenen Leiste oder mit zwei angetriebenen Leisten verschoben werden, wobei im letzteren Fall jeweils ein Hubhebel von einer Leiste verschoben wird. Die letztere Ausführungsform hat den Vorteil, daß die Hubhebel und damit die Ventile unabhängig voneinander verstellt werden können, wodurch die Steuerung der Brennkraftmaschine noch variabler erfolgen kann. Im Extremfall wird bei einem Ventil ein sogenannter 0-Hub realisiert, während das andere Ventil vollständig geöffnet wird.In a preferred embodiment of the present invention, a cylinder two intake valves and accordingly two lifting levers. These two lifting levers can according to the invention either with a driven bar or with two driven strips are moved, in the latter case one each Lifting lever is moved by a bar. The latter embodiment has the Advantage that the lifting lever and thus the valves are adjusted independently of each other can be, making the control of the internal combustion engine even more variable can be done. In extreme cases, a so-called 0-stroke is implemented for a valve, while the other valve is fully opened.
Die Leiste kann auf jedem dem Fachmann geläufige Weise angetrieben werden. Beispielsweise erfolgt der Antrieb hydraulisch oder pneumatisch, mit einem elektrischen Hubmagnet, mit einem Elektromotor, der vorzugsweise ein Getriebe aufweist oder mit einem Piezomotor.The bar can be driven in any manner familiar to the person skilled in the art. For example, the drive is hydraulic or pneumatic, with a electric solenoid, with an electric motor, preferably a gear has or with a piezomotor.
Vorzugsweise ist das Mittel, das mit der Nockenwelle zusammenwirkt, eine Rolle.Preferably, the means that cooperate with the camshaft is a roller.
Die erfindungsgemäße Ventilsteuerung eignet sich für Ventile beliebiger Art. Vorzugsweise sind die Ventile jedoch Ventile von Verbrennungsmotoren, besonders bevorzugt Einlaßventile von Verbrennungsmotoren.The valve control according to the invention is suitable for valves of any kind. Preferably however, the valves are valves of internal combustion engines, particularly preferred Intake valves for internal combustion engines.
Ein weiterer Gegenstand der vorliegenden Erfindung betrifft deshalb einen Verbrennungsmotor, der mindestens eine erfindungsgemäße Ventilsteuerung aufweist.Another object of the present invention therefore relates to an internal combustion engine, which has at least one valve control according to the invention.
Ein weiterer Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Steuerung des Hubes eines Einlaßventiles eines Verbrennungsmotors unter Verwendung der erfindungsgemäßen Ventilsteuerung, bei dem zumindest zwei Hubhebel mit einer angetriebenen Leiste entsprechend der Leistungsanforderung an den Verbrennungsmotor in der Kulisse verschoben werden.Another object of the present invention is a method for control of the stroke of an intake valve of an internal combustion engine using the Valve control according to the invention, in which at least two lifting levers with one driven bar according to the performance requirement of the Internal combustion engine to be moved in the backdrop.
Bei Teillast wird der Hubhebel so verschoben und für eine gewisse Zeit in dieser Stellung gehalten, daß das Ventil oder der Rollenschlepphebel mit einem Teil der Arbeitskurve des Hubhebels in Kontakt steht, der einen reduzierten Hub des Ventils bewirkt.At partial load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact, which reduces the stroke of the valve causes.
Bei Vollast wird der Hubhebel so verschoben und für eine gewisse Zeit in dieser Stellung gehalten, daß das Ventil oder der Rollenschlepphebel mit einem Teil der Arbeitskurve des Hubhebels in Kontakt steht, der den maximalen Hub des Ventils bewirkt. At full load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact with the maximum stroke of the valve causes.
Die vorliegende Erfindung hat den Vorteil, daß der Ventilhub je nach Leistungsanforderung vergrößert oder verringert werden kann. Durch die erfindungsgemäße Ventilhubverstellung wird die Ladungswechselarbeit in Otto-Motoren reduziert und es ergeben sich Kraftstoffeinsparungen bis zu 10% im Vergleich zur Ventilsteuerung gemäß dem Stand der Technik. Die mechanische Steuerung ist wesentlich einfacher und damit kostengünstiger herzustellen als z. B. elektronische Steuerungen des Ventilhubes. Die erfindungsgemäße Ventilsteuerung ist sehr robust und nicht wartungsanfällig. Durch den Einsatz einer Leiste, die die Hubhebel in ihrer Lage verschiebt, werden wesentlich weniger Bauteile benötigt als beim Stand der Technik.The present invention has the advantage that the valve lift depending on the performance requirement can be increased or decreased. By the invention Valve stroke adjustment reduces the gas exchange work in Otto engines and it This results in fuel savings of up to 10% compared to valve control according to the state of the art. The mechanical control is much easier and thus cheaper to produce than z. B. electronic controls of Valve stroke. The valve control according to the invention is very robust and not maintenance-prone. By using a bar that holds the lift levers in place moves, far fewer components are required than in the prior art.
Im folgenden wird die Erfindung anhand der Abbildungen 1 bis 5 erläutert. Diese Erläuterungen sind lediglich beispielhaft und schränken den allgemeinen Erfindungsgedanken nicht ein.The invention is explained below with reference to FIGS. 1 to 5 . These explanations are only examples and do not limit the general idea of the invention.
Abbildung 1a zeigt die erfindungsgemäße Ventilsteuerung für einen Zweiventilzylinder. Figure 1a shows the valve control according to the invention for a two-valve cylinder.
Abbildung 1b zeigt eine Ausführungsform der Lagerung der Hubhebel bei einem Vierventilzylinder. Figure 1b shows an embodiment of the mounting of the lifting lever in a four-valve cylinder.
Abbildung 2 zeigt eine weitere Ausführungsform der Lagerung der Hubhebel bei einem Vierventilzylinder. Figure 2 shows a further embodiment of the mounting of the lifting lever in a four-valve cylinder.
Abbildung 3 zeigt ein Parallelogramm zum Antrieb der Leiste. Figure 3 shows a parallelogram for the drive of the bar.
Abbildung 4 zeigt zwei Aktuatoren zum Antrieb der Leiste Figure 4 shows two actuators for driving the bar
Abbildung 5 zeigt zwei Aktuatoren zum Antrieb der Leiste mit einer Kraftwaage 32 Figure 5 shows two actuators for driving the bar with a power balance 32
In Figur 1a ist die erfindungsgemäße Ventilsteuerung für einen Zweiventilmotor (ein
Einlaß- und ein Auslaßventil) dargestellt. Ein Hubhebel 4 ist mit der Rolle 30 in einer
Kulisse 5 verschieblich und drehbar gelagert. Der Hubhebel wird durch die Leiste 8
und die Rückstellfeder 14 in der Kulisse verschoben. Die Kulisse 5 und die Lagerung
bzw. Führung der Leiste 8 ist in einem Deckel 11 des Motors integriert, der genau
ausgerichtet auf dem Zylinderkopf 13 oder einem Zwischenträger 12 montiert ist. Der
Fachmann versteht, daß der Hubhebel 4 durch die Leiste 8 und die Rückstellfeder 14
auch in einer bestimmten Position innerhalb der Kulisse gehalten werden kann. Die
Leiste 8 erstreckt sich senkrecht zur Papierebene entlang aller in dem Motor
vorhandener Zylinder bzw. deren Einlaßventil, die in einer Reihe angeordnet sind.
Die Position der Leiste 8 wird durch einen Wegsensor (nicht dargestellt) oder
beispielsweise durch die Umdrehungen eines Elektromotors, der die Leiste antreibt
erfaßt und einem elektronischen Steuergerät als Istwert übermittelt. Dieses
Steuergerät regelt die gewünschte Stellung des Einlaßventils anhand eines Soll-/Istwert-Vergleichs.In Figure 1a , the valve control according to the invention for a two-valve engine (an intake and an exhaust valve) is shown. A lifting lever 4 is slidably and rotatably mounted with the
Desweiteren verfügt der Hubhebel 4 über eine weitere Rolle 31, die mit der Nockenwelle
28 zusammenwirkt und die den Hubhebel 4 antreibt.Furthermore, the lifting lever 4 has a
Im unteren Teil weist der Hubhebel 4 eine Arbeitskurve 6 auf. Diese Arbeitskurve
steht in Kontakt mit der Rolle 7, die an dem Rollenschlepphebel 1 angebracht ist. Der
Rollenschlepphebel 1 wiederum bewegt das Ventil 3 (teilweise dargestellt).In the lower part, the lifting lever 4 has a working
Der linke Teil der Arbeitskurve ist bevorlugt ein Kreis um den Rollenmittelpunkt der
Rolle 30. Damit wird ein Nullhub in der dargestellten Stellung gewährleistet.The left part of the work curve is a circle around the center of the
Der Übergang vom linken (Nullhubbereich) in den rechten (Hubbereich) der
Arbeitskurve definiert die Beschleunigungsrampe der Einlaßventilbewegung.
Die Beschleunigungsrampe der Nockenwelle 28 dient nur mehr zur Beschleunigung
des Hubhebels 4 und wirkt nicht mehr auf die Ventilbeschleunigung.The transition from the left (zero stroke range) to the right (stroke range) of the working curve defines the acceleration ramp of the intake valve movement.
The acceleration ramp of the
Wird z. B. ein Verbrennungsmotor in Teillast betrieben, wird der Hubhebel 4 in der
Kulisse 5 so verschoben, daß der Rollenschlepphebel 1 mit dem linken Teil der
Arbeitskurve 6 zusammenwirkt, so daß der Hub des Ventils 3 reduziert ist. Bei Volllast
hingegen wird der Hubhebel 4 in der Kulisse 5 so verschoben, daß der rechte
Teil der Arbeitskurve 6 mit dem Rollenschlepphebel 1 in Kontakt steht, so daß der
Hub des Ventils 3 maximal ist. Is z. B. operated an internal combustion engine in partial load, the lifting lever 4 is in the
Figur 1b zeigt den Ausschnitt eines Vierventilmotors (zwei Einlaß- und zwei
Auslaßventile). In diesem Fall weist der Motor pro Zylinder zwei Einlaßventile auf,
deren Hubverhalten durch die beiden Hubhebel 4a, 4b unabhängig voneinander
geregelt wird, wobei nur der Hubhebel 4a dargestellt ist. Bei diesem Beispiel kann die
Leiste 8 zweigeteilt, was durch die Leisten 15, 16 dargestellt ist. Die Leisten 15, 16
werden unabhängig voneinander angetrieben. Mit dieser Anordnung können die
Ventilhübe der beiden Einlaßventile unabhängig voneinander geregelt werden. Es
kann z.B. ein Einlaßventil auf den 0-Hub gestellt werden und nur der Ventilhub des
anderen Ventils zur Drehmomentenregelung eingesetzt werden. Auch bei dieser
Ausführungsform wird die Position der jeweiligen Leiste 15, 16 erfaßt und zur
Regelung eingesetzt. Auch die Leisten 15, 16, erstrecken sich über alle Zylinder, die
in einer Reihe angeordnet sind bzw. deren Ventile, deren Hub die jeweilige Leiste
verändert. Figure 1b shows the detail of a four-valve engine (two intake and two exhaust valves). In this case, the engine has two intake valves per cylinder, the stroke behavior of which is regulated independently of one another by the two
Abbildung 2 zeigt eine weitere Ausführungsform der Lagerung der Hubhebel 4a, 4b
bei einem Vierventilzylinder. In diesem Fall sind die beiden Hubhebel 4a, 4b auf einer
gemeinsamen Achse 17 drehfest gelagert. Die Achse 17 wiederum ist in einem
Wälzlager 18 drehbar gelagert. Das Wälzlager 18 kann entlang der Kulisse 5 von der
Leiste 8 verschoben werden. Die Leiste 8 ist nicht zweigeteilt. Figure 2 shows a further embodiment of the mounting of the lifting
Die Achse 17 kann sich auch über alle Zylinder erstrecken, so daß alle Hubhebel auf
einer Achse aufgereiht sind und z. B. durch Abstandshülsen in der Ventilposition
gehalten werden.The
Abbildung 3 zeigt eine mögliche Antriebsform der Leisten 8 bzw. der Leisten 15, 16,
die bei dem vorliegenden Beispiel als Parallelogramm, das durch die Leisten 8 und
19 und die beiden Hebel 21 gebildet wird. Im folgenden wird nur noch auf die
Leisten 8 und 19 Bezug genommen wird. Die Leisten 8 und 19 und die Hebel 21 sind
in der Papierebene drehbar miteinander verbunden, wobei bei einem
Vierzylindermotor mindestens zwei und bei einem Sechszylindermotor auch drei oder
mehrere Hebel 21 eingesetzt werden. Die Leiste 19 ist mittels Lagern entlang der
Horizontalen in beide Richtungen verschieblich gelagert, was durch den Doppelpfeil
20 angedeutet ist. Die Lager 22, die sich im Zylinderkopf befinden, können Gleitoder
Wälzlager sein. Die Leiste 8 wird durch die Lager 23 im Zylinderkopf entlang
einer Vertikalen geführt und ihre Position kann durch Wegsensoren ermittelt werden.
Die Leiste 19 wird über einen Motor 24 und über ein Schraubengewinde verstellt. In
diesem Fall kann die Position der Leiste 8 und damit der eingestellte Hub des
Einlaßventils durch einen Wegsensor 25, der die Position der Leiste 19 erfaßt,
gemessen werden. Ebenso kann die Position der Leiste 8 durch die Erfassung der
Motorumdrehungen gemessen werden. Der Fachmann erkennt, das viele andere
Mittel beispielsweise eine Hydraulik, ein Hubmagnet, ein Schrittmotor, ein
mechanisch betätigter Hebel oder ein Seilzug geeignet sind, die Verstellung der
Leiste 19 zu bewerkstelligen. Die horizontale Bewegung 20 der Leiste 19 wird durch
die Federn 24 und 25 unterstützt. Figure 3 shows a possible drive form of the
Figur 4 zeigt den Antrieb der Leiste 8 durch mindestens zwei Aktuatoren 27. Diese
Aktuatoren können beispielsweise Hubmagneten, Elektromotoren mit oder ohne
Getriebe, Piezomotoren bzw. mechanische, hydraulische oder pneumatische Mittel
sein. FIG. 4 shows the drive of the
Figur 5 zeigt zusätzlich zu Figur 4 noch eine Kraftwaage 32, die mit den Aktuatoren
27 zusammenwirkt. Durch diese Anordnung wird die Genauigkeit des Leerlaufventilhubes
erhöht. In addition to FIG. 4, FIG. 5 also shows a force balance 32 which interacts with the
Claims (8)
aufweist,
having,
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES01110782T ES2185519T3 (en) | 2001-05-03 | 2001-05-03 | MECHANICAL REGULATION OF THE RUNNING VALVE OF A COMBUSTION ENGINE. |
DE50103100T DE50103100D1 (en) | 2001-05-03 | 2001-05-03 | Mechanical regulation of the stroke adjustment of the intake valve of an internal combustion engine |
EP01110782A EP1255027B1 (en) | 2001-05-03 | 2001-05-03 | Mechanic control of variable lift of an intake valve of an internal combustion engine |
AT01110782T ATE272787T1 (en) | 2001-05-03 | 2001-05-03 | MECHANICAL CONTROL OF THE STROKE ADJUSTMENT OF THE INLET VALVE OF AN INTERNAL COMBUSTION ENGINE |
US10/137,971 US6792903B2 (en) | 2001-05-03 | 2002-05-03 | Mechanical control of the intake valve lift adjustment in an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01110782A EP1255027B1 (en) | 2001-05-03 | 2001-05-03 | Mechanic control of variable lift of an intake valve of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1255027A1 true EP1255027A1 (en) | 2002-11-06 |
EP1255027B1 EP1255027B1 (en) | 2004-08-04 |
Family
ID=8177309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01110782A Expired - Lifetime EP1255027B1 (en) | 2001-05-03 | 2001-05-03 | Mechanic control of variable lift of an intake valve of an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US6792903B2 (en) |
EP (1) | EP1255027B1 (en) |
AT (1) | ATE272787T1 (en) |
DE (1) | DE50103100D1 (en) |
ES (1) | ES2185519T3 (en) |
Cited By (19)
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WO2004001198A1 (en) | 2002-06-20 | 2003-12-31 | Rudolf Flierl | A stroke adjusting device for valves of a combustion engine |
DE10235403A1 (en) * | 2002-08-02 | 2004-02-12 | Bayerische Motoren Werke Ag | Swivel lever for a variable stroke valve train |
DE10235401A1 (en) * | 2002-08-02 | 2004-02-12 | Bayerische Motoren Werke Ag | Lift stroke-variable valve gear for cylinder head of internal combustion engine has second pivoting lever installed stationary on first lever to form one-piece and material uniform double lever arrangement |
DE10235402A1 (en) * | 2002-08-02 | 2004-02-12 | Bayerische Motoren Werke Ag | Swivel lever for a variable stroke valve train |
DE10260557A1 (en) * | 2002-12-21 | 2004-07-01 | Ina-Schaeffler Kg | Intermediate lever for a variable valve train of an internal combustion engine |
DE10261163A1 (en) * | 2002-12-20 | 2004-07-08 | Volkswagen Ag | Variable valve gear for internal combustion engine has intermediate component supported on support element which is displaceable in housing by means of adjusting shaft |
WO2004065764A2 (en) * | 2003-01-22 | 2004-08-05 | Thyssenkrupp Automotive Ag | Device for actuating the gas exchange valves in reciprocating engines |
DE10304991A1 (en) * | 2003-02-07 | 2004-08-19 | Ina-Schaeffler Kg | Adjusting device for effecting lifting functions of lever-type cam-driven transmission links works in a varied valve mechanism for controlling a spark-ignition internal combustion engine under load |
WO2004085803A1 (en) * | 2003-03-24 | 2004-10-07 | Thyssenkrupp Automotive Ag | Device for the variable actuation of the gas exchange valves of internal combustion engines |
WO2004085804A1 (en) * | 2003-03-24 | 2004-10-07 | Thyssenkrupp Automotive Ag | Device for the variable actuation of the gas exchange valves of internal combustion engines, and method for operating one such device |
DE10314683A1 (en) * | 2003-03-29 | 2004-11-11 | BÖSL-FLIERL, Gerlinde | Variable valve lift control for an internal combustion engine with a camshaft at the bottom |
DE102004006186A1 (en) * | 2004-02-06 | 2005-08-25 | Volkswagen Ag | Valve drive for altering gas exchange valve lift in internal combustion engine, includes guide lever secured to spring for biasing intermediate lever against camshaft |
DE102004006187A1 (en) * | 2004-02-06 | 2005-08-25 | Volkswagen Ag | Valve drive for altering gas exchange valve lift in internal combustion engine, includes guide lever for determining movement of axle for roll used to actuate valve lift |
DE102004008389A1 (en) * | 2004-02-20 | 2005-09-08 | Bayerische Motoren Werke Ag | Valve drive for an I.C. engine comprises a first adjusting device with a cam whose radius increases or decreases over a periphery with respect to a rotating axle |
EP1619361A1 (en) * | 2003-05-01 | 2006-01-25 | Yamaha Hatsudoki Kabushiki Kaisha | Valve-moving device for engine |
EP1710402A1 (en) * | 2003-12-18 | 2006-10-11 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism |
DE102005040959A1 (en) * | 2005-08-30 | 2007-03-08 | Bayerische Motoren Werke Ag | Hubvariabler valve drive for an internal combustion engine |
EP1591632A3 (en) * | 2004-04-28 | 2010-09-08 | Honda Motor Co., Ltd. | Valve train of internal combustion engine |
DE102008057135B4 (en) * | 2008-11-13 | 2020-11-12 | Audi Ag | Internal combustion engine with a valve train having a roller rocker arm |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10261304B4 (en) | 2002-12-27 | 2009-01-22 | BÖSL-FLIERL, Gerlinde | Valve lift device for variable valve control of the gas exchange valves of an internal combustion engine |
EP1618293B1 (en) * | 2003-03-29 | 2008-09-24 | Hydraulik-Ring Gmbh | Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine |
EP1496211A1 (en) * | 2003-07-08 | 2005-01-12 | Bayerische Motoren Werke Aktiengesellschaft | Rocker arm for a variable lift valve drive |
CN101858233B (en) * | 2010-04-29 | 2016-04-20 | 朱譞晟 | Comprise full Variable Valve Time method and the mechanism of speed-changing swing mechanism |
DE102010048708A1 (en) * | 2010-10-19 | 2012-04-19 | Kolbenschmidt Pierburg Innovations Gmbh | Mechanically controllable valve train |
CN102155273A (en) * | 2011-04-08 | 2011-08-17 | 奇瑞汽车股份有限公司 | Variable gas distribution mechanism of engine |
DE102013113815A1 (en) * | 2013-12-11 | 2015-06-11 | Pierburg Gmbh | Transmission arrangement for a mechanically controllable valve train |
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DE19708484A1 (en) * | 1997-03-03 | 1998-09-10 | Bayerische Motoren Werke Ag | Device for changing valve motion of lifting valve, especially for gas shuttle valve |
EP1039103A2 (en) * | 1999-03-26 | 2000-09-27 | Bayerische Motoren Werke Aktiengesellschaft | Device for modifying the valve lift in an engine cylinder head |
EP1096115A1 (en) * | 1999-10-29 | 2001-05-02 | STS System Technology Services GmbH | Mechanically controlled intake valve lift in an internal combustion engine |
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US5406835A (en) * | 1992-06-27 | 1995-04-18 | Mercedes Benz Ag | Method for monitoring the switching process of a coupling device |
JPH09112219A (en) * | 1995-10-17 | 1997-04-28 | Unisia Jecs Corp | Engine valve system |
DE10006018B4 (en) * | 2000-02-11 | 2009-09-17 | Schaeffler Kg | Variable valve drive for load control of a spark-ignited internal combustion engine |
-
2001
- 2001-05-03 ES ES01110782T patent/ES2185519T3/en not_active Expired - Lifetime
- 2001-05-03 DE DE50103100T patent/DE50103100D1/en not_active Expired - Fee Related
- 2001-05-03 AT AT01110782T patent/ATE272787T1/en not_active IP Right Cessation
- 2001-05-03 EP EP01110782A patent/EP1255027B1/en not_active Expired - Lifetime
-
2002
- 2002-05-03 US US10/137,971 patent/US6792903B2/en not_active Expired - Fee Related
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US4572118A (en) * | 1981-12-31 | 1986-02-25 | Michel Baguena | Variable valve timing for four-stroke engines |
US5027760A (en) * | 1988-01-19 | 1991-07-02 | Franco Storchi | Variable timing system for engine valve operating gear |
DE4326331A1 (en) * | 1992-07-15 | 1995-02-09 | Bayerische Motoren Werke Ag | Valve gear of an internal combustion engine |
EP0780547A1 (en) * | 1995-12-22 | 1997-06-25 | Siemens Aktiengesellschaft | Internal combustion engine valve lift varying device |
DE19708484A1 (en) * | 1997-03-03 | 1998-09-10 | Bayerische Motoren Werke Ag | Device for changing valve motion of lifting valve, especially for gas shuttle valve |
EP1039103A2 (en) * | 1999-03-26 | 2000-09-27 | Bayerische Motoren Werke Aktiengesellschaft | Device for modifying the valve lift in an engine cylinder head |
EP1096115A1 (en) * | 1999-10-29 | 2001-05-02 | STS System Technology Services GmbH | Mechanically controlled intake valve lift in an internal combustion engine |
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7418935B2 (en) | 2002-06-20 | 2008-09-02 | Hydraulik-Ring Gmbh | Stroke adjusting device for valves of a combustion engine |
DE10228022A1 (en) * | 2002-06-20 | 2004-01-15 | Flierl, Rudolf, Dr. | Valve lifting device for the stroke adjustment of the gas exchange valves of an internal combustion engine |
WO2004001198A1 (en) | 2002-06-20 | 2003-12-31 | Rudolf Flierl | A stroke adjusting device for valves of a combustion engine |
DE10228022B4 (en) * | 2002-06-20 | 2009-04-23 | Entec Consulting Gmbh | Valve lifting device for stroke adjustment of the gas exchange valves of an internal combustion engine |
DE10235403A1 (en) * | 2002-08-02 | 2004-02-12 | Bayerische Motoren Werke Ag | Swivel lever for a variable stroke valve train |
DE10235401A1 (en) * | 2002-08-02 | 2004-02-12 | Bayerische Motoren Werke Ag | Lift stroke-variable valve gear for cylinder head of internal combustion engine has second pivoting lever installed stationary on first lever to form one-piece and material uniform double lever arrangement |
DE10235402A1 (en) * | 2002-08-02 | 2004-02-12 | Bayerische Motoren Werke Ag | Swivel lever for a variable stroke valve train |
DE10261163A1 (en) * | 2002-12-20 | 2004-07-08 | Volkswagen Ag | Variable valve gear for internal combustion engine has intermediate component supported on support element which is displaceable in housing by means of adjusting shaft |
DE10260557A1 (en) * | 2002-12-21 | 2004-07-01 | Ina-Schaeffler Kg | Intermediate lever for a variable valve train of an internal combustion engine |
US7055478B2 (en) | 2002-12-21 | 2006-06-06 | Ina-Schaeffler Kg | Intermediate lever for a variable valve train of an internal combustion engine |
WO2004065764A3 (en) * | 2003-01-22 | 2004-09-23 | Thyssen Krupp Automotive Ag | Device for actuating the gas exchange valves in reciprocating engines |
WO2004065764A2 (en) * | 2003-01-22 | 2004-08-05 | Thyssenkrupp Automotive Ag | Device for actuating the gas exchange valves in reciprocating engines |
DE10304991A1 (en) * | 2003-02-07 | 2004-08-19 | Ina-Schaeffler Kg | Adjusting device for effecting lifting functions of lever-type cam-driven transmission links works in a varied valve mechanism for controlling a spark-ignition internal combustion engine under load |
WO2004085803A1 (en) * | 2003-03-24 | 2004-10-07 | Thyssenkrupp Automotive Ag | Device for the variable actuation of the gas exchange valves of internal combustion engines |
DE10312959A1 (en) * | 2003-03-24 | 2004-11-18 | Thyssenkrupp Automotive Ag | Device for variable actuation of the gas exchange valves of internal combustion engines and method for operating such a device |
DE10312959B4 (en) * | 2003-03-24 | 2006-10-05 | Thyssenkrupp Automotive Ag | Device for the variable actuation of gas exchange valves of internal combustion engines |
WO2004085804A1 (en) * | 2003-03-24 | 2004-10-07 | Thyssenkrupp Automotive Ag | Device for the variable actuation of the gas exchange valves of internal combustion engines, and method for operating one such device |
JP4733630B2 (en) * | 2003-03-29 | 2011-07-27 | エンテク・コンサルティング・ゲーエムベーハー | Variable valve lift control system for combustion engine with under nice camshaft |
US7712442B2 (en) | 2003-03-29 | 2010-05-11 | Entec Consulting Gmbh | Variable valve lift control system for a combustion engine with underneath camshaft |
DE10314683B4 (en) * | 2003-03-29 | 2009-05-07 | Entec Consulting Gmbh | Variable valve lift control for a combustion engine with a bottom camshaft |
DE10314683A1 (en) * | 2003-03-29 | 2004-11-11 | BÖSL-FLIERL, Gerlinde | Variable valve lift control for an internal combustion engine with a camshaft at the bottom |
JP2006521496A (en) * | 2003-03-29 | 2006-09-21 | ゲルリンデ・ベースル−フリエアル | Variable valve lift control system for combustion engine with under nice camshaft |
EP1619361A4 (en) * | 2003-05-01 | 2008-11-26 | Yamaha Motor Co Ltd | Valve-moving device for engine |
EP1619361A1 (en) * | 2003-05-01 | 2006-01-25 | Yamaha Hatsudoki Kabushiki Kaisha | Valve-moving device for engine |
EP1710402A1 (en) * | 2003-12-18 | 2006-10-11 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism |
EP1710402A4 (en) * | 2003-12-18 | 2009-11-11 | Toyota Motor Co Ltd | Variable valve mechanism |
DE102004006187A1 (en) * | 2004-02-06 | 2005-08-25 | Volkswagen Ag | Valve drive for altering gas exchange valve lift in internal combustion engine, includes guide lever for determining movement of axle for roll used to actuate valve lift |
DE102004006186A1 (en) * | 2004-02-06 | 2005-08-25 | Volkswagen Ag | Valve drive for altering gas exchange valve lift in internal combustion engine, includes guide lever secured to spring for biasing intermediate lever against camshaft |
DE102004008389A1 (en) * | 2004-02-20 | 2005-09-08 | Bayerische Motoren Werke Ag | Valve drive for an I.C. engine comprises a first adjusting device with a cam whose radius increases or decreases over a periphery with respect to a rotating axle |
EP1591632A3 (en) * | 2004-04-28 | 2010-09-08 | Honda Motor Co., Ltd. | Valve train of internal combustion engine |
DE102005040959A1 (en) * | 2005-08-30 | 2007-03-08 | Bayerische Motoren Werke Ag | Hubvariabler valve drive for an internal combustion engine |
DE102008057135B4 (en) * | 2008-11-13 | 2020-11-12 | Audi Ag | Internal combustion engine with a valve train having a roller rocker arm |
Also Published As
Publication number | Publication date |
---|---|
US20020162522A1 (en) | 2002-11-07 |
ES2185519T1 (en) | 2003-05-01 |
ES2185519T3 (en) | 2005-03-16 |
US6792903B2 (en) | 2004-09-21 |
DE50103100D1 (en) | 2004-09-09 |
ATE272787T1 (en) | 2004-08-15 |
EP1255027B1 (en) | 2004-08-04 |
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