EP1380728A1 - Valve drive arrangement - Google Patents

Valve drive arrangement Download PDF

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Publication number
EP1380728A1
EP1380728A1 EP02450157A EP02450157A EP1380728A1 EP 1380728 A1 EP1380728 A1 EP 1380728A1 EP 02450157 A EP02450157 A EP 02450157A EP 02450157 A EP02450157 A EP 02450157A EP 1380728 A1 EP1380728 A1 EP 1380728A1
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EP
European Patent Office
Prior art keywords
valve
limiting element
drive device
stroke
lift
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
EP02450157A
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German (de)
French (fr)
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EP1380728B1 (en
Inventor
Christian Dipl.-Ing. Seltenhammer
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AVL List GmbH
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AVL List GmbH
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Publication date
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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
Application granted granted Critical
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, the stroke of the lift valve being variably adjustable is, with a camshaft with at least one cam, which is on a valve stem of the lift valve in the opening direction against one preferably by acts a first valve spring formed closing force.
  • valve train mechanisms are known with which the valve lift of 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, by changing the position of the lever axis variable valve lift is achieved. Also in 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 US 3,413,965 A, the valve lift is changed by changing the axis of rotation of the valve actuation lever.
  • the disadvantage is that in the in most cases a relatively space-consuming and consisting of many parts Adjustment mechanism for the axis of rotation must be provided.
  • the object of the present invention is to provide a simple as possible Space-saving variable valve train device consisting of a few individual parts to accomplish.
  • an elastic transmission member is arranged in the effective path between the cam and the valve stem and that a adjustable stroke limiting element is provided against the opening force of the cam act on the valve tappet or the transmission link can, the stroke limiting element in at least one activation position the opening path of the globe valve with elastic change in shape of the transmission member limited to a predefined value.
  • the elastic transmission link advantageously has one 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 single-arm or as a two-arm Lever be trained.
  • an activation device preferably formed by an eccentric acts on the stroke limiting element in the sense of a stroke limitation.
  • the stroke limiting element is preferably one has sleeve-shaped stop part, which in at least one activation position on the valve stem or on the transmission link the opening direction of the globe valve acts in the sense of a stroke limitation.
  • Stroke limiting element has a damping body, which is preferably is arranged between the stop part and the slide or lever.
  • the Damping body can preferably by at least one plate spring be educated.
  • a hydraulic, pneumatic or electrical actuating device can be provided.
  • 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 to 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 one within two cup-like pistons 8, 9 second valve spring 20, which is designed as a compression spring and the two Pistons 8, 9 press 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, the second piston 9 by a locking ring 12 is held within the first piston 8.
  • a stroke limiting element is used to variably limit the valve stroke of the lift valve 2 13 is provided, which in the activated state in the exemplary embodiments acts on the second piston 9 against the opening movement. It is also conceivable that the stroke limiting element 13 directly on the Valve stem 6 acts.
  • the stroke limiting element 13 has in the contact area with the elastic Transmission member 5 a stop part formed by a sleeve or the like 14, which in a recess 15 - for example a bore or a slot - the stroke limiting element 13 is arranged.
  • the stop part 14 is designed as a hollow body or as a U-shaped body in cross section and at least partially includes the valve stem 6.
  • On the transmission member facing side of the stroke limiting element 13 is between the stroke limiting element 13 and the stop part 14 one by two plate springs 16 formed damping part arranged. This damping part prevents too hard an impact of the stop member 14 on the second piston 9 of the transmission member 5th
  • the stroke limiting element is 13 formed by a two-armed lever 13a which by one Axis 25 is pivotable and on which one formed by an eccentric 17 Actuating device 18 acts.
  • Fig. 3 shows an embodiment variant, at which the stroke limiting element 13 is formed by a one-armed lever 13b is.
  • the actuating device 18 is on the valve plate 2a of the lift valve 2 facing side of the stroke limiting element 13 is arranged.
  • the Levers 13a, 13b must always be very rigid.
  • Fig. 4 shows a third embodiment, in which the stroke limiting element 13 is also designed as a one-armed lever 13c.
  • the eccentric 17 of the actuator 18 engages in a connecting rod eye 19 of the one-armed lever 13c on.
  • valve drive device 1 shows the valve drive device 1 with the stroke limiting element deactivated 13.
  • the eccentric 17 is in its rest position.
  • the cam 4 of the camshaft 3 acts on the valve stem via the elastic transmission member 5 6 a. Since the second valve spring 20 has a much greater spring stiffness is designed as the first valve spring 7, is - with deactivated stroke limiting element 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 seat ring 27 is arranged, which with the valve plate 2a interacts.
  • Fig. 2 shows the valve drive device 1 with activated stroke limiting element 13.
  • the eccentric 17 is rotated into an activation position so that the lever 13a is deflected by a distance h e.
  • the stop part 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 displaces it by a distance h n . Since the second piston 9 is prevented from further deflection by the stop part 14 of the stroke limiting element 13, the second valve spring 20 is compressed and the stroke movement due to the cam 4 is at least partially absorbed by the transmission element 5.
  • the actual valve stroke h v thus corresponds to the instantaneous cam stroke h n as long as this is smaller than the path h 0 -he / 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 Stroke limiting element 13.
  • the course is with broken lines 31, 32, 33 the valve stroke h shown when stroke limiting element 13 moderate, medium or is heavily activated.
  • FIG. 6 corresponds to that of FIG. 5 with the difference that with 30a and 30b the valve stroke h for a by turning the camshaft 3 effected adjustment of the phase position shown in the direction of the double arrow 34 is.
  • the levels of lines 31, 32, and 33 are not changed.
  • valve drive device 1 described enables very space-saving and Variable valve lift limitation in a simple manner with very few individual parts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The valve drive device has an elastic transfer member (5) in the path between the cam (4) and the valve stem (6). An adjustable valve stroke limiting element (13) is fitted, which can act against the opening force of the cam on the valve stem or transfer member. In at least one activated position, this element limits the opening path of the valve (2) by elastically deforming the transfer member to a pre-defined extent.

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, the stroke of the lift valve being variably adjustable is, with a camshaft with at least one cam, which is on a valve stem of the lift valve in the opening direction against one preferably by acts a first valve spring formed closing force.

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 of 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, by changing the position of the lever axis variable valve lift is achieved. Also in 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 US 3,413,965 A, the valve lift is changed by changing the axis of rotation of the valve actuation lever. The disadvantage is that in the in most cases a relatively space-consuming and consisting of many parts Adjustment mechanism for the axis of rotation must be provided.

Aufgabe der vorliegenden Erfindung ist es, auf möglichst einfache Weise eine platzsparende und aus wenigen Einzelteilen bestehende variable Ventiltriebseinrichtung zu schaffen.The object of the present invention is to provide a simple as possible Space-saving variable valve train device consisting of a few individual parts 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 the valve stem and that a adjustable stroke limiting element is provided against the opening force of the cam act on the valve tappet or the transmission link can, the stroke limiting element in at least one activation position the opening path of the globe valve with elastic change in shape 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.In contrast to known valve train devices for variable valve lift the position of an axis of rotation of a valve actuation lever is not changed, but an elastic transmission element in the effective path between the cams and the valve stem, and a stroke limiting element are provided, which limits and opens the opening travel of the globe valve in a predefined manner prevented further opening, the elastic transmission member over the the remaining stroke range of the cam. The elastic transmission link advantageously has one 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 single-arm or as a two-arm Lever be trained.

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 variant of the invention, that an activation device preferably formed by an eccentric acts on the stroke limiting element in the sense of a stroke limitation. By Simply turning the eccentric turns the stroke limiting element into an activation position brought in which it starts from a certain valve lift limited further opening of the globe valve.

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.It is preferably provided that the stroke limiting element is preferably one has sleeve-shaped stop part, which in at least one activation position on the valve stem or on the transmission link the opening direction of the globe 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 hit the stop part hard on the transmission link or a To avoid the valve stem plate, it is particularly advantageous if that Stroke limiting element has a damping body, which is preferably is arranged between the stop part and the slide or lever. The Damping body can preferably by at least one plate spring be educated.

Alternativ zu einer rein mechanischen Betätigung des Hubbegrenzungselementes durch Verdrehen eines Exzenters kann auch eine hydraulische, pneumatische oder elektrische Betätigungseinrichtung vorgesehen sein.As an alternative to a purely mechanical actuation of the stroke limiting element by turning an eccentric, a hydraulic, pneumatic or electrical actuating device can 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.
The invention is explained in more detail below with reference to the figures. Show it:
Fig. 1
the valve train device according to the invention in the deactivated state in a first embodiment;
Fig. 2
this valve train device in the activated state with the valve slightly open;
Fig. 3
a valve train device according to the invention in a second embodiment;
Fig. 4
a valve train device according to the invention in a third embodiment and
5 and 6
Diagrams to explain the operation of the invention.

Funktionsgleiche Bauteile sind mit gleichen Bezugszeichen versehen.Components with the same function are provided with the same reference symbols.

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 to 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 one within two cup-like pistons 8, 9 second valve spring 20, which is designed as a compression spring and the two Pistons 8, 9 press 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, 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.A stroke limiting element is used to variably limit the valve stroke of the lift valve 2 13 is provided, which in the activated state in the exemplary embodiments acts on the second piston 9 against the opening movement. It is also conceivable that the stroke limiting element 13 directly on 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 stroke limiting element 13 has in the contact area with the elastic Transmission member 5 a stop part formed by a sleeve or the like 14, which in a recess 15 - for example a bore or a slot - the stroke limiting element 13 is arranged. The stop part 14 is designed as a hollow body or as a U-shaped body in cross section and at least partially includes the valve stem 6. On the transmission member facing side of the stroke limiting element 13 is between the stroke limiting element 13 and the stop part 14 one by two plate springs 16 formed damping part arranged. This damping part prevents too hard an 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 variant shown in FIGS. 1 and 2, the stroke limiting element is 13 formed by a two-armed lever 13a which by one Axis 25 is pivotable and on which one formed by an eccentric 17 Actuating device 18 acts. Fig. 3 shows an embodiment variant, at which the stroke limiting element 13 is formed by a one-armed lever 13b is. The actuating device 18 is on the valve plate 2a of the lift valve 2 facing side of the stroke limiting element 13 is arranged. The Levers 13a, 13b must always be very rigid.

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 stroke limiting element 13 is also designed as a one-armed lever 13c. The eccentric 17 of the actuator 18 engages in a connecting rod eye 19 of the one-armed lever 13c on.

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.1 shows the valve drive device 1 with the stroke limiting element deactivated 13. The eccentric 17 is in its rest position. The cam 4 of the camshaft 3 acts on the valve stem via the elastic transmission member 5 6 a. Since the second valve spring 20 has a much greater spring stiffness is designed as the first valve spring 7, is - with deactivated stroke limiting element 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.With 26 the cylinder head of the internal combustion engine is shown only partially, in which a valve seat ring 27 is arranged, which with the valve plate 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 stroke limiting element 13. The eccentric 17 is rotated into an activation position so that the lever 13a is deflected by a distance h e. The stop part 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 displaces it by a distance h n . Since the second piston 9 is prevented from further deflection by the stop part 14 of the stroke limiting element 13, the second valve spring 20 is compressed and the stroke movement due to the cam 4 is at least partially absorbed by the transmission element 5. By deflecting the second valve spring 20, from a maximum stroke defined by the position of the stroke limiting element 13, the cam-related stroke movement is no longer transmitted to the lift valve 2, 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 means the current cam stroke, h 0 the distance of the stop part 14 from the piston 9 in the starting position, ie when the stroke limiting element 13 is not activated, h e the current eccentric stroke and x the ratio of the lever arms of the lever 13a.

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 stroke h v thus corresponds to the instantaneous cam stroke h n as long as this is smaller than the path h 0 -he / 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 Stroke limiting element 13. The course is with broken lines 31, 32, 33 the valve stroke h shown when stroke limiting element 13 moderate, medium or is heavily 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 stroke h for a by turning the camshaft 3 effected adjustment of the phase position shown in the direction of the double arrow 34 is. The levels of lines 31, 32, and 33 are not changed.

Die beschriebene Ventiltriebseinrichtung 1 ermöglicht auf sehr platzsparende und einfache Weise mit sehr wenigen Einzelteilen eine variable Ventilhubbegrenzung.The valve drive device 1 described enables very space-saving and Variable valve lift limitation in a simple manner with very few individual parts.

Claims (9)

Ventiltriebseinrichtung (1) für zumindest ein Hubventil (2) für eine Brennkraftmaschine, wobei der Hubweg des Hubventils (2) variabel einstellbar ist, mit einer Nockenwelle (3) mit zumindest einem Nocken (4), welcher auf einen Ventilschaft (6) des Hubventiles (2) in Öffnungsrichtung entgegen einer vorzugsweise durch eine erste Ventilfeder (7) gebildeten Schließkraft einwirkt, dadurch gekennzeichnet, dass ein elastisches Übertragungsglied (5) im Wirkweg zwischen dem Nocken (4) und dem Ventilschaft (6) angeordnet ist und dass ein verstellbares Hubbegrenzungselement (13) vorgesehen ist, welches entgegen der Öffnungskraft des Nockens (4) auf den Ventilstößel (6) oder das Übertragungsglied (5) einwirken kann, wobei in zumindest einer Aktivierungsposition das Hubbegrenzungselement (13) den Öffnungsweg des Hubventiles (2) unter elastischer Formänderung des Übertragungsgliedes (5) auf einen vordefinierten Wert begrenzt.Valve drive device (1) for at least one lift valve (2) for an internal combustion engine, the lift path of the lift valve (2) being variably adjustable, with a camshaft (3) with at least one cam (4), which is attached to a valve stem (6) of the lift valve (2) acts in the opening direction against a closing force preferably formed by a first valve spring (7), characterized in that an elastic transmission member (5) is arranged in the effective path between the cam (4) and the valve stem (6) and that an adjustable stroke limiting element (13) is provided, which can act against the opening force of the cam (4) on the valve tappet (6) or the transmission member (5), the stroke-limiting element (13) in at least one activation position changing the opening of the lift valve (2) with an elastic shape change the transmission element (5) limited to a predefined value. Ventiltriebseinrichtung (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Übertragungsglied eine, vorzugsweise durch eine Druckfeder gebildete, zweite Ventilfeder (20) aufweist, welche eine größere Federsteifigkeit aufweist als die erste Ventilfeder (7).Valve drive device (1) according to claim 1, characterized in that the transmission member has a second valve spring (20), preferably formed by a compression spring, which has a greater spring stiffness than the first valve spring (7). Ventiltriebseinrichtung (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) als Schieber ausgebildet ist.Valve drive device (1) according to claim 1 or 2, characterized in that the stroke limiting element (13) is designed as a slide. Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) als einarmiger- oder zweiarmiger Hebel (13a, 13b) ausgebildet ist.Valve drive device (1) according to one of claims 1 to 3, characterized in that the stroke limiting element (13) is designed as a one-armed or two-armed lever (13a, 13b). Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass eine vorzugsweise durch einen Exzenter (18) gebildete Aktivierungseinrichtung (17) auf das Hubbegrenzungselement (13) im Sinne einer Hubbegrenzung einwirkt.Valve drive device (1) according to one of Claims 1 to 4, characterized in that an activation device (17), preferably formed by an eccentric (18), acts on the stroke limiting element (13) in the sense of a stroke limitation. Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) einen vorzugsweise hülsenförmigen Anschlagteil (14) aufweist, welcher in zumindest einer Aktivierungsposition auf den Ventilschaft (6) oder auf das Übertragungsglied (5) entgegen der Öffnungsrichtung des Hubventiles (2) im Sinne einer Hubbegrenzung einwirkt. Valve drive device (1) according to one of claims 1 to 5, characterized in that the stroke limiting element (13) has a preferably sleeve-shaped stop part (14) which, in at least one activation position, on the valve stem (6) or on the transmission member (5) against the Direction of opening of the lift valve (2) acts in the sense of a stroke limitation. Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) einen Dämpfungskörper aufweist, welcher vorzugsweise zwischen dem Anschlagteil (17) und dem Schieber (13a, 13b) oder Hebel angeordnet ist.Valve drive device (1) according to one of claims 1 to 6, characterized in that the stroke limiting element (13) has a damping body, which is preferably arranged between the stop part (17) and the slide (13a, 13b) or lever. Ventiltriebseinrichtung (1) nach Anspruch 7, dadurch gekennzeichnet, dass der Dämpfungskörper durch mindestens eine Tellerfeder (16) gebildet ist.Valve drive device (1) according to claim 7, characterized in that the damping body is formed by at least one plate spring (16). Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass zusätzlich eine Einrichtung zur Verstellung der Ventilöffnungszeiten vorgesehen ist, die vorzugsweise als Einrichtung zur Phasenverstellung der Nockenwelle (3) ausgebildet ist.Valve drive device (1) according to one of claims 1 to 8, characterized in that a device for adjusting the valve opening times is additionally provided, which is preferably designed as a device for phase adjustment of the camshaft (3).
EP20020450157 2002-07-12 2002-07-12 Valve drive arrangement Expired - Lifetime EP1380728B1 (en)

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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

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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

Families Citing this family (1)

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DE102012009621B4 (en) * 2012-05-15 2023-06-29 Neumayer Tekfor Engineering Gmbh Valve operating device for an internal combustion engine

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Publication number Priority date Publication date Assignee Title
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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DE50202718D1 (en) 2005-05-12

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