EP1050669B1 - Valve driving arrangement with variable lift for an internal combustion engine - Google Patents

Valve driving arrangement with variable lift for an internal combustion engine Download PDF

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Publication number
EP1050669B1
EP1050669B1 EP00108823A EP00108823A EP1050669B1 EP 1050669 B1 EP1050669 B1 EP 1050669B1 EP 00108823 A EP00108823 A EP 00108823A EP 00108823 A EP00108823 A EP 00108823A EP 1050669 B1 EP1050669 B1 EP 1050669B1
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EP
European Patent Office
Prior art keywords
camshaft
roller
camshafts
tappet
bearing
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.)
Expired - Lifetime
Application number
EP00108823A
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German (de)
French (fr)
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EP1050669A3 (en
EP1050669A2 (en
Inventor
Paul Dipl.-Ing. Breidenbach
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Adam Opel GmbH
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Adam Opel GmbH
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Publication of EP1050669A3 publication Critical patent/EP1050669A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • 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
    • 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
    • F01L13/0015—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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0047—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention is based on the object generic device to create, compared to a Engine type with usual overhead camshaft with only minor changes to the cylinder head and without essential changes in the production manages.
  • a first camshaft 1 and a second Camshaft 2 are in a cylinder head 3 of an internal combustion engine rotatably mounted.
  • the camshafts 1, 2 are of the crankshaft of the internal combustion engine in conventional Way driven so that they z. B. at a Four-stroke internal combustion engine with half crankshaft speed rotate.
  • a device known per se provided with which the camshafts 1, 2 against each other in their angular position are adjustable.
  • the first camshaft 1 is connected to an actuating cam 4 as well two this actuating cam 4 adjacent latching circuits 5 forming discs 6 provided ( Figure 6).

Description

Die Erfindung betrifft eine Vorrichtung zur Betätigung eines Ventils mit variablem Hub an Brennkraftmaschinen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a device for actuation a valve with variable stroke of internal combustion engines according to the preamble of claim 1.

Eine Vorrichtung dieser Art ist mit DE 35 31 000 beschrieben. Bei dieser bekannten Vorrichtung ist der Betätigungshebel als Waagebalken ausgeführt, der sich quer über das zu betätigende Ventil erstreckt. Die beiden Nockenwellen verlaufen oberhalb des Waagebalkens beidseits der Ventilachse. In einem weiteren Ausführungsbeispiel sind die beiden Nockenwellen koaxial zueinander angeordnet und der Betätigungshebel ist über einen Zwischenhebel am Zylinderkopf angelenkt. Durch diese Anordnungen ergibt sich die bedeutende Schwierigkeit, daß eine wesentliche Änderung des üblichen Zylinderkopfaufbaues erforderlich ist, um die Nockenwellen installieren zu können. Der dabei erforderliche Einbauraum beeinträchtigt die Anordnung der Gasführungskanäle im Zylinderkopf erheblich.A device of this type is described with DE 35 31 000. In this known device, the actuating lever is designed as a balance beam which extends transversely across the valve to be actuated. The two camshafts run above the balance beam on both sides of the valve axis. In a further embodiment, the two camshafts are arranged coaxially with each other and the actuating lever is articulated via an intermediate lever on the cylinder head. Through this A North calculations results in the major difficulty that a significant change in the usual cylinder head structure is required to install the camshafts. The case required installation space significantly affects the arrangement of the gas guide channels in the cylinder head.

Eine weitere Vorrichtung dieser Art beschreibt DE 35 19 319. Bei dieser ist der Betätigungshebel mit einer speziellen Kurbel am Zylinderkopf angelenkt oder in einer Führungsbahn unter Federlast geführt. Von Nachteil ist hier der Bauteileaufwand.Another device of this type describes DE 35 19 319. In this is the operating lever with a special crank on the cylinder head hinged or in a guideway guided under spring load. Of disadvantage Here is the component cost.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung zu schaffen, die gegenüber einer Motorbauart mit üblicher obenliegender Nockenwelle mit nur geringfügigen Änderungen am Zylinderkopf und ohne wesentliche Änderungen bei der Fertigung auskommt.The invention is based on the object generic device to create, compared to a Engine type with usual overhead camshaft with only minor changes to the cylinder head and without essential changes in the production manages.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Die weiteren Ansprüche betreffen vorteilhafte Weiterbildungen der Erfindung.This task is characterized by the characterizing Characteristics of claim 1 solved. The other claims relate to advantageous developments of the invention.

Durch die übereinanderliegenden beiden Nockenwellen kann die erste Nockenwelle an dem Ort im Zylinderkopf angeordnet sein, an dem sich bei einem herkömmlichen Zylinderkopf mit obenliegender Nockenwelle diese ebenfalls befindet. Die zweite Nockenwelle ist in relativ einfacher Weise oberhalb der ersten Nockenwelle lagerbar, in dem der erste Nockenwellenlagerdeckel mit einem weiteren Lager versehen wird, welches mit einem zusätzlichen Lagerdeckel abgeschlossen wird.Through the superimposed two camshafts may be the first camshaft at the location in the cylinder head be arranged, in which at a conventional Cylinder head with overhead camshaft this too located. The second camshaft is in relative easily storable above the first camshaft, in which the first camshaft bearing cap with another Warehouse is provided, which with an additional Bearing cover is completed.

Zwischen den beiden Nockenwellen erstreckt sich das Verbindungsteil. Da dies lediglich auf Zug beansprucht ist, kann es sehr schlank ausgeführt werden, so daß die Nockenwellen nahe aneinander installiert werden können. Durch die Ausbildung des Verbindungsteils als Gabel kann der Stellnocken der zweiten Nockenwelle in den Gabelzwischenraum eintauchen. Auch diese Maßnahme wirkt sich positiv auf die kompakte Bauweise aus.Between the two camshafts extends the connecting part. Because this only claims to train is, it can be run very slim, so that the camshafts are installed close to each other can. By forming the connecting part as a fork can the adjusting cam of the second camshaft in the Immerse fork space. This measure also works have a positive impact on the compact design.

Eine besondere zusätzliche Anlenkung für Führungshebel oder dergleichen am Zylinderkopf ist nicht erforderlich, so daß dafür auch kein Raum vorgesehen werden muß. A special additional linkage for guide levers or the like on the cylinder head is not required so that no space is provided for it got to.

Die Funktion der erfindungsgemäßen Vorrichtung, die im wesentlichen auf dem Prinzip der Addition von zwei unabhängig voneinander wirkenden Betätigungswegen beruht, geht aus dem nachstehend beschriebenen Ausführungsbeispiel hervor, welches anhand einer Zeichnung näher erläutert ist. Es zeigen

Fig. 1:
den prinzipiellen Aufbau einer Vorrichtung nach der Erfindung;
Fig. 2:
eine Ansicht auf das Verbindungsteil der Vorrichtung nach Figur 1 in Richtung des Pfeiles A;
Fig. 3:
eine Ansicht auf den Betätigungshebel der Vorrichtung nach Figur 1 in Richtung des Pfeiles B;
Fig. 4:
die Vorrichtung nach Figur 1 in vereinfachter Darstellung bei maximalem Ventilhub;
Fig. 5:
die Vorrichtung nach Figur 1 in vereinfachter Darstellung bei Ventilhub gleich Null;
Fig. 6:
die Vorrichtung nach Figur 5 in Richtung des Pfeiles C;
Fig. 7:
einen Schnitt durch einen Zylinderkopf einer Brennkraftmaschine mit einer Vorrichtung gemäß den Fig. 1 - 6;
Fig. 8:
einen Schnitt durch einen Zylinderkopf einer Brennkraftmaschine mit den Lagerstellen der Nockenwellen für eine Vorrichtung gemäß den Fig. 1 - 6.
The function of the device according to the invention, which is based essentially on the principle of the addition of two independently acting actuation paths, will become apparent from the embodiment described below, which is explained in more detail with reference to a drawing. Show it
Fig. 1:
the basic structure of a device according to the invention;
Fig. 2:
a view of the connecting part of the device of Figure 1 in the direction of arrow A;
3:
a view of the operating lever of the device of Figure 1 in the direction of arrow B;
4:
the device of Figure 1 in a simplified representation at maximum valve lift;
Fig. 5:
the device of Figure 1 in a simplified representation at valve lift equal to zero;
Fig. 6:
the device of Figure 5 in the direction of arrow C;
Fig. 7:
a section through a cylinder head of an internal combustion engine with a device according to Figures 1-6.
Fig. 8:
a section through a cylinder head of an internal combustion engine with the bearing points of the camshafts for a device according to FIGS. 1-6.

Eine erste Nockenwelle 1 und eine zweite Nockenwelle 2 sind in einem Zylinderkopf 3 einer Brennkraftmaschine drehbar gelagert. Die Nockenwellen 1, 2 sind von der Kurbelwelle der Brennkraftmaschine in üblicher Weise angetrieben, so daß sie sich z. B. bei einer Viertaktbrennkraftmaschine mit halber Kurbelwellendrehzahl drehen. Zusätzlich ist eine an sich bekannte Vorrichtung vorgesehen, mit welcher die Nockenwellen 1, 2 gegeneinander in ihrer Winkellage verstellbar sind. Die erste Nockenwelle 1 ist mit einem Betätigungsnocken 4 sowie zwei diesem Betätigungsnocken 4 benachbarten Rastkreise 5 bildenden Scheiben 6 versehen (Figur 6).A first camshaft 1 and a second Camshaft 2 are in a cylinder head 3 of an internal combustion engine rotatably mounted. The camshafts 1, 2 are of the crankshaft of the internal combustion engine in conventional Way driven so that they z. B. at a Four-stroke internal combustion engine with half crankshaft speed rotate. In addition, a device known per se provided with which the camshafts 1, 2 against each other in their angular position are adjustable. The first camshaft 1 is connected to an actuating cam 4 as well two this actuating cam 4 adjacent latching circuits 5 forming discs 6 provided (Figure 6).

Unterhalb der ersten Nockenwelle 1 und von dieser beabstandet befindet sich ein in einer Bohrung 7 des Zylinderkopfes 3 verschiebbarer Tassenstößel 8. Der Tassenstößel 8 liegt mit der inneren Fläche seines Bodens 9 auf dem Schaft 10 eines einen Gaswechselkanal 11 steuernden Ventils auf, welches durch eine Schließfeder 12 in Schließstellung gehalten ist. Oberhalb der ersten Nockenwelle 1 und von dieser beabstandet ist die zweite Nockenwelle 2 angeordnet. Sie ist mit einem Stellnocken 13 versehen.Below the first camshaft 1 and from this spaced is located in a hole 7 of the Cylinder head 3 sliding bucket tappet 8. The bucket tappet 8 lies with the inner surface of its bottom. 9 on the shaft 10 of a gas exchange channel 11 controlling Valve, which by a closing spring 12 in Closed position is held. Above the first camshaft 1 and spaced therefrom is the second camshaft 2 arranged. It is provided with a parking cam 13.

Auf der äußeren Fläche des Bodens 9 des Tassenstößels 8 ist ein Betätigungshebel 14 mit seinem einen Endpunkt 15 schwenkbar gelagert. Der andere Endpunkt 16 des Betätigungshebels 14 ist allseitig schwenkbar an einem Lager 17 eines Verbindungsteiles 18 abgestützt. Der Betätigungshebel 14 trägt mittig zwischen seinen Endpunkten 15, 16 eine Rolle 19, die am Betätigungsnocken 4 der ersten Nockenwelle 1 anliegt. Das Verbindungsteil 18 ist gabelförmig ausgebildet (Figur 2). Zwei vom Lager 17 ausgehende Gabelteile 20 erstrecken sich zwischen die beiden Nockenwellen 1, 2; und an ihren dem Lager 17 abgewandten Ende 28 tragen sie eine axial dreigeteilte Rolle 22. Ein erstes Rollenteil 22.1 befindet sich zwischen den beiden Gabelteilen 20 in einem Gabelzwischenraum 23 und steht in Wirkverbindung mit dem Stellnocken 13 der zweiten Nockenwelle 2. Zwei weitere Rollenteile 22.2 sind außerhalb des Gabelzwischenraumes 23 gleichachsig mit dem ersten Rollenteil 22.1 angeordnet (Figur 2). Sie liegen auf den von den Scheiben 6 der ersten Nockenwelle 1 gebildeten Rastkreis 5 auf (Figur 6). Das Lager 17 ist gegenüber dem Verbindungsteil 18 verstellbar ausgeführt, um das Spiel zwischen den Teilen einstellen und die Toleranzen ausgleichen zu können.On the outer surface of the bottom 9 of the tappet 8 is an operating lever 14 with its one End point 15 pivotally mounted. The other endpoint 16 of the actuating lever 14 is pivotable on all sides at one Bearing 17 a connecting part 18 supported. Of the Actuating lever 14 carries centrally between its endpoints 15, 16 a roller 19, which on the actuating cam 4 of first camshaft 1 is applied. The connecting part 18 is fork-shaped (Figure 2). Two outgoing from the camp 17 Fork parts 20 extend between the two Camshafts 1, 2; and facing away from the camp 17 at her At the end of 28, they carry an axially three-part roller 22. Ein first roller part 22.1 is located between the two Fork 20 in a fork gap 23 and is in Operative connection with the adjusting cam 13 of the second camshaft 2. Two further roller parts 22.2 are outside of Fork clearance 23 coaxial with the first roller part 22.1 arranged (Figure 2). They are on the of the disks 6 of the first camshaft 1 formed locking circle 5 on (Figure 6). The bearing 17 is opposite to the Connector 18 made adjustable to the game set between the parts and compensate for the tolerances to be able to.

Die erste Nockenwelle 1 ist im Zylinderkopf 3 in üblicher Weise gelagert. Ein Nockenwellenlagerdeckel 24, der mit Lagerdeckelschrauben 25 am Zylinderkopf 3 befestigt ist, bildet die obere Hälfte des Lagers der ersten Nockenwelle 1, während die untere Hälfte des Lagers vom Zylinderkopf 3 gebildet ist. Gleichzeitig bildet der Nockenwellenlagerdeckel 24 die untere Hälfte des Lagers für die zweite Nockenwelle 2, während dessen obere Hälfte von einem weiteren Lagerdeckel 26 gebildet ist, der mit Schrauben 27 am Nockenwellenlagerdeckel 24 gehalten ist (Figur 8).The first camshaft 1 is in the cylinder head 3rd stored in the usual way. A camshaft bearing cap 24, which fastened with bearing cap screws 25 on the cylinder head 3 is the upper half of the bearing forms the first Camshaft 1, while the lower half of the bearing is formed by the cylinder head 3. At the same time forms the Camshaft bearing cap 24, the lower half of the bearing for the second camshaft 2, during the upper half thereof is formed by a further bearing cap 26, with Screw 27 is held on the camshaft bearing cap 24 (Figure 8).

Figur 4 zeigt die Vorrichtung in einer Stellung, bei der ein maximaler Ventilhub x erzielt wird. Der Stellnocken 13 der zweiten Nockenwelle 2 hat die Rolle 22 am Verbindungsteil 18 auf dem Rastkreis 5 der ersten Nockenwelle 1 maximal nach links (bezogen auf Figur 4) ausgelenkt. Damit ist gleichzeitig der Endpunkt 16 des Betätigungshebels 14, der am Lager 17 des Verbindungsteiles 18 abgestützt ist, nach links verschoben. Der Betätigungsnocken 4 der ersten Nockenwelle 1 wirkt auf die Rolle 19 des Betätigungshebels 14 so ein, daß dieser um den Endpunkt 15 entgegen dem Uhrzeigersinn schwenkt und dabei gleichzeitig den Tassenstößel 8 und mit diesem das Ventil entgegen der Kraft der Schließfeder 12 so bewegt, daß das Ventil maximal geöffnet wird.FIG. 4 shows the device in a position in which a maximum valve lift x is achieved. Of the Positioning cam 13 of the second camshaft 2 has the roller 22nd on the connecting part 18 on the latching circuit 5 of the first Camshaft 1 maximum to the left (relative to FIG. 4) deflected. This is at the same time the end point 16 of Operating lever 14, the bearing 17 of the connecting part 18 is supported, moved to the left. The actuating cam 4 of the first camshaft 1 acts on the Roller 19 of the actuating lever 14 so that this order the end point 15 pivots counterclockwise and while the bucket tappet 8 and with this the Valve moves against the force of the closing spring 12, that the valve is opened maximum.

Da sich der Endpunkt 15 des Betätigungshebels 14 mit dem Tassenstößel 8 nur linear entlang der Mittellinie der Bohrung 7 bewegen kann, wird die dabei auftretende Bewegung des anderen Endpunktes 16 durch eine Schwenkbewegung des Verbindungsteiles 18 um den Mittelpunkt der Rolle 22 aufgenommen.Since the end point 15 of the actuating lever 14 with the tappet 8 only linear along the center line can move the hole 7, the occurring Movement of the other end point 16 by a Pivoting movement of the connecting part 18 about the center taken up by the roller 22.

Der Stellnocken 13 auf der zweiten Nockenwelle 2 taucht dabei zwischen die beiden Gabelteile 20 und zwischen die beiden die Rastkreise 5 tragenden Scheiben 6 der ersten Nockenwelle 1.The parking cam 13 on the second camshaft 2 dives between the two fork parts 20 and between the two the latching circuits 5 carrying discs. 6 the first camshaft. 1

Wird die zweite Nockenwelle 2 gegenüber der ersten Nockenwelle 1 um einen Winkelbetrag verdreht, wie dies In Figur 5 dargestellt ist, dann liegt am betätigten Ventil ein Null-Hub vor. Der Stellnocken 13 der zweiten Nockenwelle 2 beaufschlagt jetzt die Rolle 22 des Verbindungsteiles 18 nicht. Diese kann sich so durch die über den Betätigungshebel 14 und das Verbindungsteil 18 übertragene Kraft der Schließfeder 12 auf dem Rastkreis 5 nach rechts (bezogen auf Figur 5) bewegen. In gleicher Weise bewegt sich auch das Lager 17 des Verbindungsteiles 18 und mit ihm der Endpunkt 16 des Betätigungshebels 14 nach rechts. Gleichzeitig liegt die Rolle 19 des Betätigungshebels 14 am Betätigungsnocken 4 der ersten Nockenwelle 1 weiterhin an. Trotz Maximalhubes des Betätigungsnockens 4 wird der am Tassenstößel 8 anliegende Endpunkt 15 des Betätigungshebels 14 nicht ausgelenkt. If the second camshaft 2 with respect to the first Camshaft 1 is rotated by an angular amount, such as this is shown in Figure 5, then is the actuated Valve before a zero stroke. The parking cam 13 of the second Camshaft 2 now acts on the roller 22 of the connecting part 18 not. This can be so over the actuating lever 14 and the connecting part 18 transmitted Force of the closing spring 12 on the latching circuit. 5 move to the right (with reference to FIG. 5). In the same Way also moves the bearing 17 of the connecting part 18 and with it the end point 16 of the operating lever 14th to the right. At the same time lies the roller 19 of the actuating lever 14 on the actuating cam 4 of the first camshaft 1 continues. Despite maximum stroke of the actuating cam 4 is the voltage applied to the tappet 8 endpoint 15 of the actuating lever 14 is not deflected.

Durch Verändern des Verstellwinkels zwischen den beiden Nockenwellen 1, 2 kann jede beliebige Ventilerhebung zwischen Null und maximalem Ventilhub eingestellt werden. Bei gleichzeitiger Verstellung beider Nockenwellen 1, 2 kann zusätzlich auch Einfluß auf die Ventilöffnungszeiten genommen werden.By changing the adjustment angle between the two camshafts 1, 2 can be any valve lift set between zero and maximum valve lift become. With simultaneous adjustment of both Camshafts 1, 2 can also influence the Valve opening times are taken.

Der Zwischenraum zwischen den beiden Nockenwellen 1, 2 bzw. dem Stellnocken 13 und dem Rastkreis 5 ist so gewählt, daß er immer kleiner als der Durchmesser der Rolle 22 des Verbindungsteiles 18 ist. Somit ist sichergestellt, daß die Rolle 22 an ihrem konstruktiv vorgesehenen Ort verbleibt.The space between the two camshafts 1, 2 or the adjusting cam 13 and the latching circuit 5 is chosen so that it is always smaller than the diameter of the Roller 22 of the connecting part 18 is. This ensures that that the roller 22 provided on its constructive Place remains.

Durch die Anordnung des Verbindungsteiles 18 zwischen den beiden Nockenwellen 1, 2 in Verbindung mit der Lagerung des Betätigungshebels 14 auf dem Tassenstößel 8 wird eine sehr kompakte Bauweise der Vorrichtung möglich. Wie die Figuren 7 und 8 verdeutlichen, kann die erfindungsgemäße Vorrichtung mit relativ geringem Aufwand an einen herkömmlichen Zylinderkopf adaptiert werden.Due to the arrangement of the connecting part 18th between the two camshafts 1, 2 in conjunction with the storage of the actuating lever 14 on the bucket tappet 8 becomes a very compact construction of the device possible. As the figures 7 and 8 illustrate, the Inventive device with relatively little effort adapted to a conventional cylinder head.

Claims (7)

  1. Apparatus for actuating a valve with variable stroke in internal combustion engines, including two rotating camshafts (1, 2) displaceable relative to each other, a valve acted upon by a closing spring, an axially guided tappet (8) acting on one stem end of the valve, and an actuating lever (14) acted upon by both camshafts and acting on the tappet (8), characterised in that the first of the two camshafts is arranged above the tappet (8) and provided with an actuating cam (4) and the second of the two camshafts is arranged above the first camshaft (1) and provided with an adjusting cam (13), the actuating lever (14) at a first end point (15) is mounted pivotably on the tappet (8), with the other end point (16) is supported on a bearing (17) of a connecting portion (18) so as to be pivotable in all directions and centrally is operatively connected to the actuating cam (4) of the first camshaft (1), wherein the connecting portion (18) extends transversely between the two camshafts (1, 2) and at its end (21) opposite the bearing (17) carries a roller (22) which abuts against a locking circle (5) of the first camshaft (1) and against an adjusting cam (13) of the second camshaft (2), wherein in every position of the two camshafts (1, 2) relative to each other the locking circle (5) and the adjusting cam (13) have a distance between them which is smaller than the diameter of the roller (22).
  2. Apparatus according to claim 1, characterised in that the connecting portion (18) is fork-shaped, wherein at the bottom of the fork is arranged a bearing (17) for the actuating lever (14), at the ends (21) of the fork portions (20) are formed bearings for the roller (22), and the roller (22) is divided in three in an axial direction in such a way that a central roller portion (22.1) located between the fork portions (20) is operatively connected to the adjusting cam (13) of the second camshaft (2) which enters the fork gap (23), and in each case a roller portion (22.2) located on both sides of and outside the fork gap (23) rests on the locking circle (5) of the first camshaft (1).
  3. Apparatus according to claims 1 and 2, characterised in that the actuating cam (4) is arranged between two discs (6) of the first camshaft (1) each forming the locking circle (5).
  4. Apparatus according to any of claims 1 to 3, characterised in that the bearing (17) of the actuating lever (14) is formed on the connecting portion (18) so as to be displaceable in the axial direction of the connecting portion (18).
  5. Apparatus according to any of claims 1 to 4, characterised in that the actuating lever (14) is centrally operatively connected to the actuating cam (4) via a roller (19) mounted on the actuating lever (14).
  6. Apparatus according to any of claims 1 to 5, characterised in that the tappet (8) is a bucket tappet.
  7. Apparatus according to any of claims 1 to 6, characterised in that the first camshaft (1) arranged above the tappet (8) is held by camshaft bearing caps (24) which on their upper side carry bearing shells for receiving the second camshaft (2), which are closed off with a further bearing cap (26).
EP00108823A 1999-05-05 2000-04-26 Valve driving arrangement with variable lift for an internal combustion engine Expired - Lifetime EP1050669B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19920512A DE19920512A1 (en) 1999-05-05 1999-05-05 Device for actuating a valve with a variable stroke on internal combustion engines
DE19920512 1999-05-05

Publications (3)

Publication Number Publication Date
EP1050669A2 EP1050669A2 (en) 2000-11-08
EP1050669A3 EP1050669A3 (en) 2001-05-16
EP1050669B1 true EP1050669B1 (en) 2005-01-26

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ID=7906942

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Application Number Title Priority Date Filing Date
EP00108823A Expired - Lifetime EP1050669B1 (en) 1999-05-05 2000-04-26 Valve driving arrangement with variable lift for an internal combustion engine

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EP (1) EP1050669B1 (en)
DE (2) DE19920512A1 (en)

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CN102061952A (en) * 2010-10-08 2011-05-18 奇瑞汽车股份有限公司 Camshaft bearing seat
CN102966391B (en) * 2012-11-25 2014-10-15 天津大学 Swinging arm mechanism controlled by using double cams
DE102014003466A1 (en) * 2014-03-11 2015-09-17 Meta Motoren- Und Energie-Technik Gmbh Device and method for the variable control of a valve of an internal combustion engine

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DE50009324D1 (en) 2005-03-03
EP1050669A3 (en) 2001-05-16
DE19920512A1 (en) 2000-11-09
EP1050669A2 (en) 2000-11-08

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