EP1380728B1 - Valve drive arrangement - Google Patents

Valve drive arrangement Download PDF

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Publication number
EP1380728B1
EP1380728B1 EP20020450157 EP02450157A EP1380728B1 EP 1380728 B1 EP1380728 B1 EP 1380728B1 EP 20020450157 EP20020450157 EP 20020450157 EP 02450157 A EP02450157 A EP 02450157A EP 1380728 B1 EP1380728 B1 EP 1380728B1
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EP
European Patent Office
Prior art keywords
valve
stroke
lift device
transmission member
spring
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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.)
Expired - Lifetime
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EP20020450157
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German (de)
French (fr)
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EP1380728A1 (en
Inventor
Christian Dipl.-Ing. Seltenhammer
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AVL List GmbH
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AVL List GmbH
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Priority to EP20020450157 priority Critical patent/EP1380728B1/en
Priority to DE50202718T priority patent/DE50202718D1/en
Publication of EP1380728A1 publication Critical patent/EP1380728A1/en
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Publication of EP1380728B1 publication Critical patent/EP1380728B1/en
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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
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L13/0005—Deactivating valves
    • 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
    • F01L13/0031—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 tappet or pushrod length

Definitions

  • the invention relates to a valve drive device for at least one lift valve for an internal combustion engine, wherein the stroke of the lifting valve variably adjustable is, with a camshaft with at least one cam, which on a valve stem the lifting valve in the opening direction against a preferably by a closing force acting on a first valve spring acts.
  • valve train mechanisms are known, with which the valve lift a gas exchange valve of an internal combustion engine can be changed.
  • US 5,365,895 A discloses a variable valve lift mechanism for a Internal combustion engine, in which by changing the position of the lever axis variable valve lift is achieved. Also in the US 4,714,057 A, the US 4,724,822 A, US 4,986,227 A, US 4,638,773 A, US 4,397,270 A or the US 3,413,965 A, the change of the valve lift is done by changing the axis of rotation of the valve operating lever.
  • the disadvantage is that in the most cases a relatively space-consuming and many-part existing Adjustment mechanism for the axis of rotation must be provided.
  • Object of the present invention is to simplify a simple way space-saving and consisting of a few parts variable valve train device to accomplish.
  • an elastic transmission member is arranged in the effective path between the cam and valve stem and that a adjustable stroke limiting element is provided, against the opening force of the cam on the valve stem or the transmission member act can, wherein in at least one activation position, the Hubbegrenzungselement the opening stroke of the lifting valve under elastic deformation of the transmission member limited to a predefined value.
  • the elastic transmission member has a preferably formed by a compression spring second valve spring with a greater spring stiffness than the first valve spring on.
  • the stroke limiting device can be used as a slide, as a one-armed or as a two-armed Lever be formed.
  • an activation device preferably formed by an eccentric acting on the Hubbegrenzungselement in the sense of a stroke limitation.
  • the Hubbegrenzungselement By simply turning the eccentric, the Hubbegrenzungselement is in an activation position brought in which it from a certain valve lift further opening of the lift valve limited.
  • the Hubbegrenzungselement a preferably having sleeve-shaped stop member, which in at least one activation position on the valve stem or on the transfer member the opening direction of the lifting valve acts in the sense of a stroke limitation.
  • the Hubbegrenzungselement has a damping body, which preferably is arranged between the stop member and the slider or lever.
  • the Damping body may preferably by at least one plate spring be formed.
  • the valve drive device 1 for at least one lift valve 2 of an internal combustion engine has a camshaft 3 with at least one cam 4, which via an elastic transmission member 5 on the valve stem 6 of the lift valve. 2 acts in the opening direction against the closing force of a first valve spring 7.
  • the transmission member 5 has within two cup-like pistons 8, 9 a second valve spring 20, which is designed as a compression spring and the two Piston 8, 9 presses apart.
  • the first piston 8 is in a guide cylinder 10 of the cylinder housing 11, the second piston 9 within the first Piston 8 slidably mounted, wherein the second piston 9 by a locking ring 12 is held within the first piston 8.
  • a Hubbegrenzungselement 13 is provided, which in the activated state in the embodiments acting on the second piston 9 against the opening movement. It is also conceivable that the Hubbegrenzungselement 13 directly to the Valve stem 6 acts.
  • the Hubbegrenzungselement 13 has in the contact area with the elastic Transmission member 5 a formed by a sleeve or the like stop member 14, which in a recess 15 - for example, a bore or a slot - the Hubbegrenzungsiatas 13 is arranged.
  • the stopper part 14 is formed as a hollow body or as a cross-sectionally U-shaped body and at least partially surrounds the valve stem 6.
  • On the transfer member facing side of Hubbegrenzungs institutes 13 is between the Hubbegrenzungselement 13 and the stop member 14 a through two disc springs 16 formed damping part arranged. This damping part prevents too hard impact of the stop member 14 on the second piston 9 of the transmission member 5th
  • Fig. 3 shows an embodiment, in the stroke limiting element 13 is formed by a one-armed lever 13b is.
  • the actuator 18 is on the valve disc 2a of the lift valve 2 facing side of Hubbegrenzungsiatas 13 arranged.
  • Lever 13a, 13b must be listed very rigid in any case.
  • Fig. 4 shows a third embodiment in which the Hubbegrenzungselement 13 is also designed as a one-armed lever 13c.
  • the eccentric 17 of the actuator 18 engages in a connecting rod 19 of the one-armed lever 13c one.
  • Fig. 1 shows the valve drive device 1 with deactivated Hubbegrenzungselement 13.
  • the eccentric 17 is in its rest position.
  • the cam 4 of the camshaft 3 acts via the elastic transmission member 5 on the valve stem 6 on. Since the second valve spring 20 with much greater spring stiffness is formed as the first valve spring 7, is - with deactivated Hubbegrenzungselement 13 - the second valve spring 20 is not deflected, so that the by the cam 4 predetermined maximum valve lift unimpeded on the Lift valve 2 is transmitted.
  • valve 26 denotes the only partially shown cylinder head of the internal combustion engine, in which a valve seat ring 27 is arranged, with the valve disc 2a interacts.
  • Fig. 2 shows the valve drive device 1 with activated Hubbegrenzungselement 13.
  • the eccentric 17 is rotated in an activation position, so that the lever 13a is deflected by a distance he.
  • the stop member 14 is thereby pressed in the direction of the transmission member 5.
  • the cam 4 of the camshaft 3 simultaneously acts on the first piston 8 and shifts it by a distance h n . Since the second piston 9 is prevented from further deflecting by the abutment part 14 of the stroke limiting element 13, the second valve spring 20 is compressed and the lifting movement according to the cam 4 is at least partially absorbed by the transmission member 5.
  • the actual valve lift h v thus corresponds to the instantaneous cam lift h n as long as it is smaller than the travel h 0 - h e / x which is released by the stroke limiting element 13.
  • valve lift h is plotted against the crank angle KW.
  • the solid line 30 shows the valve lift when not activated Hubbegrenzungselement 13.
  • With broken lines 31, 32, 33 is the course the valve lift h shown when Hubbegrenzungselement 13 moderately, medium or strongly activated.
  • FIG. 6 corresponds to that of FIG. 5 with the difference that with 30a and 30b the valve lift h for a by a rotation of the camshaft 3 effected adjustment of the phase position in the sense of the double arrow 34 shown is.
  • the levels of lines 31, 32, and 33 are not changed thereby.
  • the described valve drive device 1 allows for very space-saving and easy way with very few items a variable valve lift limit.

Description

Die Erfindung betrifft eine Ventiltriebseinrichtung für zumindest ein Hubventil für eine Brennkraftmaschine, wobei der Hubweg des Hubventils variabel einstellbar ist, mit einer Nockenwelle mit zumindest einem Nocken, welcher auf einen Ventilschaft des Hubventiles in Öffnungsrichtung entgegen einer vorzugsweise durch eine erste Ventilfeder gebildeten Schließkraft einwirkt.The invention relates to a valve drive device for at least one lift valve for an internal combustion engine, wherein the stroke of the lifting valve variably adjustable is, with a camshaft with at least one cam, which on a valve stem the lifting valve in the opening direction against a preferably by a closing force acting on a first valve spring acts.

Es sind zahlreiche Ventiltriebsmechanismen bekannt, mit welchem der Ventilhub eines Gaswechselventiles einer Brennkraftmaschine verändert werden kann.Numerous valve train mechanisms are known, with which the valve lift a gas exchange valve of an internal combustion engine can be changed.

Die US 5,365,895 A offenbart einen variablen Ventilhubmechanismus für eine Brennkraftmaschine, bei der durch Veränderung der Lage der Hebelachse ein variabler Ventilhub erzielt wird. Auch bei der US 4,714,057 A, der US 4,724,822 A, der US 4,986,227 A, der US 4,638,773 A, der US 4,397,270 A oder der US 3,413,965 A erfolgt die Veränderung des Ventilhubes durch Verändern der Drehachse des Ventilbetätigungshebels. Nachteilig ist, dass in den meisten Fällen ein relativ platzaufwendiger und aus vielen Teilen bestehender Verstellmechanismus für die Drehachse zur Verfügung gestellt werden muss.US 5,365,895 A discloses a variable valve lift mechanism for a Internal combustion engine, in which by changing the position of the lever axis variable valve lift is achieved. Also in the US 4,714,057 A, the US 4,724,822 A, US 4,986,227 A, US 4,638,773 A, US 4,397,270 A or the US 3,413,965 A, the change of the valve lift is done by changing the axis of rotation of the valve operating lever. The disadvantage is that in the most cases a relatively space-consuming and many-part existing Adjustment mechanism for the axis of rotation must be provided.

US2001/0013325 A beschreibt eine Ventiltriebseinrichtung gemäß dem Oberbegriff des Anspruchs 1.US2001 / 0013325 A describes a valve drive device according to the preamble of claim 1.

Aufgabe der vorliegenden Erfindung ist es, auf möglichst einfache Weise eine platzsparende und aus wenigen Einzelteilen bestehende variable Ventiltriebseinrichtung zu schaffen.Object of the present invention is to simplify a simple way space-saving and consisting of a few parts variable valve train device to accomplish.

Erfindungsgemäß wird dies dadurch erreicht, dass ein elastisches Übertragungsglied im Wirkweg zwischen Nocken und Ventilschaft angeordnet ist und dass ein verstellbares Hubbegrenzungselement vorgesehen ist, entgegen der Öffnungskraft des Nockens auf den Ventilstößel oder das Übertragungsglied einwirken kann, wobei in zumindest einer Aktivierungsposition das Hubbegrenzungselement den Öffnungsweg des Hubventiles unter elastischer Formänderung des Übertragungsgliedes auf einen vordefinierten Wert begrenzt.According to the invention this is achieved in that an elastic transmission member is arranged in the effective path between the cam and valve stem and that a adjustable stroke limiting element is provided, against the opening force of the cam on the valve stem or the transmission member act can, wherein in at least one activation position, the Hubbegrenzungselement the opening stroke of the lifting valve under elastic deformation of the transmission member limited to a predefined value.

Zum Unterschied zu bekannten Ventiltriebseinrichtungen für variablen Ventilhub wird nicht die Lage einer Drehachse eines Ventilbetätigungshebels verändert, sondern ein elastisches Übertragungsglied im Wirkweg zwischen dem Nocken und dem Ventilschaft, sowie ein Hubbegrenzungselement vorgesehen, welches den Öffnungsweg des Hubventils in einer vordefinierten Weise begrenzt und ein weiteres Öffnen verhindert, wobei das elastische Übertragungsglied über den restlichen Hubbereich des Nockens einfedert. Das elastische Übertragungsglied weist dabei Vorteilhafterweise eine vorzugsweise durch eine Druckfeder gebildete zweite Ventilfeder mit einer größeren Federsteifigkeit als die erste Ventilfeder auf.Unlike known valve train devices for variable valve lift is not changed the position of a rotation axis of a valve operating lever, but an elastic transfer member in the path of action between the cam and the valve stem, and a Hubbegrenzungselement provided, which limits the opening stroke of the lift valve in a predefined manner and a prevents further opening, wherein the elastic transmission member on the restrains the remaining stroke of the cam. The elastic transmission member Advantageously, it has a preferably formed by a compression spring second valve spring with a greater spring stiffness than the first valve spring on.

Die Hubbegrenzungseinrichtung kann als Schieber, als einarmiger oder als zweiarmiger Hebel ausgebildet sein.The stroke limiting device can be used as a slide, as a one-armed or as a two-armed Lever be formed.

In einer besonders einfachen Ausführungsvariante der Erfindung ist vorgesehen, dass eine vorzugsweise durch einen Exzenter gebildete Aktivierungseinrichtung auf das Hubbegrenzungselement im Sinne einer Hubbegrenzung einwirkt. Durch einfaches Verdrehen des Exzenters wird das Hubbegrenzungselement in eine Aktivierungsposition gebracht, in welcher es ab einem bestimmten Ventilhub ein weiteres Öffnen des Hubventiles begrenzt.In a particularly simple embodiment of the invention is provided that an activation device preferably formed by an eccentric acting on the Hubbegrenzungselement in the sense of a stroke limitation. By simply turning the eccentric, the Hubbegrenzungselement is in an activation position brought in which it from a certain valve lift further opening of the lift valve limited.

Vorzugsweise ist dabei vorgesehen, dass das Hubbegrenzungselement einen vorzugsweise hülsenförmigen Anschlagteil aufweist, welcher in zumindest einer Aktivierungsposition auf den Ventilschaft oder auf das Übertragungsglied entgegen der Öffnungsrichtung des Hubventiles im Sinne einer Hubbegrenzung einwirkt.Preferably, it is provided that the Hubbegrenzungselement a preferably having sleeve-shaped stop member, which in at least one activation position on the valve stem or on the transfer member the opening direction of the lifting valve acts in the sense of a stroke limitation.

Um ein hartes Aufschlagen des Anschlagteiles am Übertragungsglied oder einem Teller des Ventilschaftes zu vermeiden, ist es besonders vorteilhaft, wenn das Hubbegrenzungselement einen Dämpfungskörper aufweist, welcher vorzugsweise zwischen dem Anschlagteil und dem Schieber oder Hebel angeordnet ist. Der Dämpfungskörper kann dabei vorzugsweise durch mindestens eine Tellerfeder gebildet sein.To a hard impact of the stop member on the transfer member or a To avoid plate of the valve stem, it is particularly advantageous if the Hubbegrenzungselement has a damping body, which preferably is arranged between the stop member and the slider or lever. Of the Damping body may preferably by at least one plate spring be formed.

Alternativ zu einer rein mechanischen Betätigung des Hubbegrenzungselementes durch Verdrehen eines Exzenters kann auch eine hydraulische, pneumatische oder elektrische Betätigungseinrichtung vorgesehen sein.Alternatively to a purely mechanical actuation of the Hubbegrenzungselementes by turning an eccentric can also be a hydraulic, pneumatic or electrical actuator may be provided.

Die Erfindung wird im Folgenden anhand der Figuren näher erläutert. Es zeigen:

Fig. 1
die erfindungsgemäße Ventiltriebeinrichtung im deaktivierten Zustand in einer ersten Ausführungsvariante;
Fig. 2
diese Ventiltriebeinrichtung im aktivierten Zustand bei geringfügig geöffnetem Hubventil;
Fig. 3
eine erfindungsgemäße Ventiltriebseinrichtung in einer zweiten Ausführungsvariante;
Fig. 4
eine erfindungsgemäße Ventiltriebseinrichtung in einer dritten Ausführungsvariante und
Fig. 5 und 6
Diagramme zur Erklärung der Wirkungsweise der Erfindung.
Funktionsgleiche Bauteile sind mit gleichen Bezugszeichen versehen.The invention will be explained in more detail below with reference to FIGS. Show it:
Fig. 1
the valve drive device according to the invention in the deactivated state in a first embodiment;
Fig. 2
this valve drive device in the activated state at a slightly open globe valve;
Fig. 3
a valve drive device according to the invention in a second embodiment variant;
Fig. 4
a valve drive device according to the invention in a third embodiment and
FIGS. 5 and 6
Diagrams for explaining the operation of the invention.
Functionally identical components are provided with the same reference numerals.

Die Ventiltriebseinrichtung 1 für zumindest ein Hubventil 2 einer Brennkraftmaschine weist eine Nockenwelle 3 mit zumindest einem Nocken 4 auf, welcher über ein elastisches Übertragungsglied 5 auf den Ventilschaft 6 des Hubventiles 2 in Öffnungsrichtung entgegen der Schließkraft einer ersten Ventilfeder 7 einwirkt.The valve drive device 1 for at least one lift valve 2 of an internal combustion engine has a camshaft 3 with at least one cam 4, which via an elastic transmission member 5 on the valve stem 6 of the lift valve. 2 acts in the opening direction against the closing force of a first valve spring 7.

Das Übertragungsglied 5 weist innerhalb zweier napfartiger Kolben 8, 9 eine zweite Ventilfeder 20 auf, welche als Druckfeder ausgebildet ist und die beiden Kolben 8, 9 auseinander drückt. Der erste Kolben 8 ist dabei in einem Führungszylinder 10 des Zylindergehäuses 11, der zweite Kolben 9 innerhalb des ersten Kolbens 8 verschiebbar gelagert, wobei der zweite Kolben 9 durch einen Sicherungsring 12 innerhalb des ersten Kolbens 8 gehalten wird.The transmission member 5 has within two cup-like pistons 8, 9 a second valve spring 20, which is designed as a compression spring and the two Piston 8, 9 presses apart. The first piston 8 is in a guide cylinder 10 of the cylinder housing 11, the second piston 9 within the first Piston 8 slidably mounted, wherein the second piston 9 by a locking ring 12 is held within the first piston 8.

Zur variablen Begrenzung des Ventilhubes des Hubventiles 2 ist ein Hubbegrenzungselement 13 vorgesehen, welches im aktivierten Zustand in den Ausführungsbeispielen auf den zweiten Kolben 9 entgegen der Öffnungsbewegung einwirkt. Es ist auch denkbar, dass das Hubbegrenzungselement 13 direkt auf den Ventilschaft 6 einwirkt.For variable limitation of the valve lift of the lift valve 2 is a Hubbegrenzungselement 13 is provided, which in the activated state in the embodiments acting on the second piston 9 against the opening movement. It is also conceivable that the Hubbegrenzungselement 13 directly to the Valve stem 6 acts.

Das Hubbegrenzungselement 13 weist im Kontaktbereich mit dem elastischen Übertragungsglied 5 einen durch eine Hülse oder dergleichen gebildeten Anschlagteil 14 auf, welcher in einer Ausnehmung 15 - beispielsweise eine Bohrung oder einen Schlitz - des Hubbegrenzungselementes 13 angeordnet ist. Der Anschlagteil 14 ist als Hohlkörper oder als im Querschnitt U-förmiger Körper ausgebildet und umfasst zumindest teilweise den Ventilschaft 6. Auf der dem Übertragungsglied zugewandten Seite des Hubbegrenzungselementes 13 ist zwischen dem Hubbegrenzungselement 13 und dem Anschlagteil 14 ein durch zwei Tellerfedern 16 gebildeter Dämpfungsteil angeordnet. Dieser Dämpfungsteil verhindert ein zu hartes Aufschlagen des Anschlagteiles 14 am zweiten Kolben 9 des Übertragungsgliedes 5.The Hubbegrenzungselement 13 has in the contact area with the elastic Transmission member 5 a formed by a sleeve or the like stop member 14, which in a recess 15 - for example, a bore or a slot - the Hubbegrenzungselementes 13 is arranged. The stopper part 14 is formed as a hollow body or as a cross-sectionally U-shaped body and at least partially surrounds the valve stem 6. On the transfer member facing side of Hubbegrenzungselementes 13 is between the Hubbegrenzungselement 13 and the stop member 14 a through two disc springs 16 formed damping part arranged. This damping part prevents too hard impact of the stop member 14 on the second piston 9 of the transmission member 5th

In der in den Fig. 1 und 2 dargestellten Ausführungsvariante ist das Hubbegrenzungselement 13 durch einen zweiarmigen Hebel 13a gebildet, der um eine Achse 25 schwenkbar ist und auf welchen eine durch einen Exzenter 17 gebildete Betätigungseinrichtung 18 einwirkt. Fig. 3 zeigt eine Ausführungsvariante, bei der das Hubbegrenzungselement 13 durch einen einarmigen Hebel 13b gebildet ist. Die Betätigungseinrichtung 18 ist dabei auf der dem Ventilteller 2a des Hubventiles 2 zugewandten Seite des Hubbegrenzungselementes 13 angeordnet. Der Hebel 13a, 13b muss in jedem Fall sehr biegesteif aufgeführt sein.In the embodiment shown in FIGS. 1 and 2, the Hubbegrenzungselement 13 formed by a two-armed lever 13 a, which is around a Axis 25 is pivotable and on which a formed by an eccentric 17 Actuator 18 acts. Fig. 3 shows an embodiment, in the stroke limiting element 13 is formed by a one-armed lever 13b is. The actuator 18 is on the valve disc 2a of the lift valve 2 facing side of Hubbegrenzungselementes 13 arranged. Of the Lever 13a, 13b must be listed very rigid in any case.

Fig. 4 zeigt eine dritte Ausführungsvariante, bei der das Hubbegrenzungselement 13 ebenfalls als einarmiger Hebel 13c ausgeführt ist. Der Exzenter 17 der Betätigungseinrichtung 18 greift dabei in ein Pleuelauge 19 des einarmigen Hebels 13c ein.Fig. 4 shows a third embodiment in which the Hubbegrenzungselement 13 is also designed as a one-armed lever 13c. The eccentric 17 of the actuator 18 engages in a connecting rod 19 of the one-armed lever 13c one.

Fig. 1 zeigt die Ventiltriebseinrichtung 1 bei deaktiviertem Hubbegrenzungselement 13. Der Exzenter 17 befindet sich dabei in seiner Ruheposition. Der Nocken 4 der Nockenwelle 3 wirkt über das elastische Übertragungsglied 5 auf dem Ventilschaft 6 ein. Da die zweite Ventilfeder 20 mit wesentlich größerer Federsteifigkeit ausgebildet ist als die erste Ventilfeder 7, wird - bei deaktiviertem Hubbegrenzungselement 13 - die zweite Ventilfeder 20 nicht ausgelenkt, so dass der durch den Nocken 4 vorbestimmte maximale Ventilhub ungemindert auf das Hubventil 2 übertragen wird.Fig. 1 shows the valve drive device 1 with deactivated Hubbegrenzungselement 13. The eccentric 17 is in its rest position. The cam 4 of the camshaft 3 acts via the elastic transmission member 5 on the valve stem 6 on. Since the second valve spring 20 with much greater spring stiffness is formed as the first valve spring 7, is - with deactivated Hubbegrenzungselement 13 - the second valve spring 20 is not deflected, so that the by the cam 4 predetermined maximum valve lift unimpeded on the Lift valve 2 is transmitted.

Mit 26 ist der nur teilweise dargestellte Zylinderkopf der Brennkraftmaschine bezeichnet, in dem ein Ventilsitzring 27 angeordnet ist, der mit dem Ventilteller 2a zusammenwirkt.26 denotes the only partially shown cylinder head of the internal combustion engine, in which a valve seat ring 27 is arranged, with the valve disc 2a interacts.

Fig. 2 zeigt die Ventiltriebseinrichtung 1 mit aktiviertem Hubbegrenzungselement 13. Der Exzenter 17 ist dabei in eine Aktivierungsstellung verdreht, so dass der Hebel 13a um eine Wegstrecke he ausgelenkt wird. Der Anschlagteil 14 wird dadurch in Richtung des Übertragungsgliedes 5 gedrückt. Dabei wirkt der Nocken 4 der Nockenwelle 3 gleichzeitig auf den ersten Kolben 8 ein und verschiebt diesen um eine Wegstrecke hn. Da der zweite Kolben 9 vom Anschlagteil 14 des Hubbegrenzungselementes 13 am weiteren Auslenken gehindert wird, wird die zweite Ventilfeder 20 zusammengedrückt und die Hubbewegung zufolge des Nockens 4 zumindest teilweise vom Übertragungsglied 5 aufgenommen. Durch das Einfedern der zweiten Ventilfeder 20 wird somit ab einem durch die Stellung des Hubbegrenzungselementes 13 definierten maximalen Hub die nockenbedingte Hubbewegung nicht mehr auf das Hubventil 2 übertragen, so dass sich für den tatsächlichen Ventilhub hv die folgende Gleichung (1) ergibt, hv = min (hn, h0 - he/x) wobei hn den momentanen Nockenhub bedeutet, h0 den Abstand des Anschlagteils 14 vom Kolben 9 in der Ausgangsstellung, d.h. bei nicht aktiviertem Hubbegrenzungselement 13, he den momentanen Exzenterhub und x das Verhältnis der Hebelarme des Hebels 13a. Fig. 2 shows the valve drive device 1 with activated Hubbegrenzungselement 13. The eccentric 17 is rotated in an activation position, so that the lever 13a is deflected by a distance he. The stop member 14 is thereby pressed in the direction of the transmission member 5. In this case, the cam 4 of the camshaft 3 simultaneously acts on the first piston 8 and shifts it by a distance h n . Since the second piston 9 is prevented from further deflecting by the abutment part 14 of the stroke limiting element 13, the second valve spring 20 is compressed and the lifting movement according to the cam 4 is at least partially absorbed by the transmission member 5. As a result of the deflection of the second valve spring 20, the cam-dependent lifting movement is thus no longer transferred to the lifting valve 2 from a maximum stroke defined by the position of the stroke limiting element 13, so that the following equation (1) results for the actual valve lift h v . H v = min (h n , H 0 - H e / X) where h n is the instantaneous cam lift, h 0 is the distance of the stop member 14 from the piston 9 in the starting position, ie, when not activated Hubbegrenzungselement 13, h e the current Exzenterhub and x the ratio of the lever arms of the lever 13 a.

Der tatsächliche Ventilhub hv entspricht also so lange dem momentanen Nockenhub hn als dieser kleiner ist als der Weg h0 - he/x, der von dem Hubbegrenzungselement 13 freigegeben wird.The actual valve lift h v thus corresponds to the instantaneous cam lift h n as long as it is smaller than the travel h 0 - h e / x which is released by the stroke limiting element 13.

In dem Diagramm von Fig. 5 ist der Ventilhub h über dem Kurbelwinkel KW aufgetragen. Die ausgezogene Linie 30 zeigt den Ventilhub bei nicht aktiviertem Hubbegrenzungselement 13. Mit unterbrochenen Linien 31, 32, 33 ist der Verlauf des Ventilhubs h dargestellt, wenn Hubbegrenzungselement 13 mäßig, mittel oder stark aktiviert ist.In the diagram of FIG. 5, the valve lift h is plotted against the crank angle KW. The solid line 30 shows the valve lift when not activated Hubbegrenzungselement 13. With broken lines 31, 32, 33 is the course the valve lift h shown when Hubbegrenzungselement 13 moderately, medium or strongly activated.

Das Diagramm von Fig. 6 entspricht dem von Fig. 5 mit dem Unterschied, dass mit 30a und 30b der Ventilhub h für eine durch eine Verdrehung der Nockenwelle 3 bewirkte Verstellung der Phasenlage im Sinn des Doppelpfeils 34 dargestellt ist. Die Niveaus der Linien 31, 32, und 33 werden dadurch nicht verändert.The diagram of FIG. 6 corresponds to that of FIG. 5 with the difference that with 30a and 30b the valve lift h for a by a rotation of the camshaft 3 effected adjustment of the phase position in the sense of the double arrow 34 shown is. The levels of lines 31, 32, and 33 are not changed thereby.

Die beschriebene Ventiltriebseinrichtung 1 ermöglicht auf sehr platzsparende und einfache Weise mit sehr wenigen Einzelteilen eine variable Ventilhubbegrenzung.The described valve drive device 1 allows for very space-saving and easy way with very few items a variable valve lift limit.

Claims (9)

  1. A valve lift device (1) for at least one stroke valve (2) for an internal combustion engine, with the valve travel of the stroke valve (2) being variably adjustable, with a cam shaft (3) with at least one cam (4) which acts on a valve stem (6) of the stroke valve (2) in the opening direction against a closing force preferably formed by a first valve spring (7), with an elastic transmission member (5) being arranged in the operative path between the cam (4) and the valve stem (6), characterized in that an adjustable stroke limiting element (13) is provided which can act against the opening force of the cam (4) on the valve stem (6) or the transmission member (5), with the stroke limiting element (13), in at least one activation position, limiting the opening path of the stroke valve (2) to a predetermined value under elastic change of shape of the transmission member (5).
  2. A valve lift device (1) according to claim 1, characterized in that the transmission member comprises a second valve spring (20) which is preferably formed by a pressure spring and which has a higher spring rigidity than the first valve spring (7).
  3. A valve lift device (1) according to claim 1 or 2, characterized in that the stroke limiting element (13) is arranged as a slide.
  4. A valve lift device (1) according to one of the claims 1 to 3, characterized in that the stroke limiting device (13) is arranged as a single-arm or double-arm lever (13a, 13b).
  5. A valve lift device (1) according to one of the claims 1 to 4, characterized in that an activation device (17) which is preferably formed by an eccentric (18) acts upon the stroke limiting device (13) within the terms of a stroke limitation.
  6. A valve lift device (1) according to one of the claims 1 to 5, characterized in that the stroke limiting element (13) comprises a preferably sleeve-like limit stop portion (14) which acts in at least one activation position upon the valve stem (6) on the transmission member (5) against the direction of opening of the stroke valve (2) within the terms of a stroke limitation.
  7. A valve lift device (1) according to claim 6, characterized in that the stroke limiting element (13) comprises a damping body which is preferably arranged between the limit stop portion (14) and the slide (13a, 13b) or lever.
  8. A valve lift device (1) according to claim 7, characterized in that the damping body is formed by at least one cup spring (16).
  9. A valve lift device (1) according to one of the claims 1 to 8, characterized in that in addition a device is provided for adjusting the valve opening times, which device is preferably arranged as a device for phase adjustment of the camshaft (3).
EP20020450157 2002-07-12 2002-07-12 Valve drive arrangement Expired - Lifetime EP1380728B1 (en)

Priority Applications (2)

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EP20020450157 EP1380728B1 (en) 2002-07-12 2002-07-12 Valve drive arrangement
DE50202718T DE50202718D1 (en) 2002-07-12 2002-07-12 Valve drive device

Applications Claiming Priority (1)

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EP20020450157 EP1380728B1 (en) 2002-07-12 2002-07-12 Valve drive arrangement

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EP1380728B1 true EP1380728B1 (en) 2005-04-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009621A1 (en) * 2012-05-15 2013-11-21 Neumayer Tekfor Holding Gmbh Valve operating device for an internal combustion engine

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DE102006018588A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Charge-cycle valve operating device for stroke piston internal combustion engine, has cam stroke transferring device designed as clamping device between plungers and valve and implemented in hydraulic, electric and mechanical manner
GB2566489A (en) * 2017-09-15 2019-03-20 Camcon Auto Ltd Actuation assembly and methods of operation thereof
CN109854323A (en) * 2019-03-12 2019-06-07 北方工业大学 Piston engine valve device with low power consumption and quick response

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JPS60162004A (en) * 1984-01-31 1985-08-23 Mitsubishi Motors Corp Engine valve moving mechanism with valve action stoppage appliance
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009621A1 (en) * 2012-05-15 2013-11-21 Neumayer Tekfor Holding Gmbh Valve operating device for an internal combustion engine
DE102012009621B4 (en) 2012-05-15 2023-06-29 Neumayer Tekfor Engineering Gmbh Valve operating device for an internal combustion engine

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DE50202718D1 (en) 2005-05-12

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