EP1050669A2 - 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
EP1050669A2
EP1050669A2 EP00108823A EP00108823A EP1050669A2 EP 1050669 A2 EP1050669 A2 EP 1050669A2 EP 00108823 A EP00108823 A EP 00108823A EP 00108823 A EP00108823 A EP 00108823A EP 1050669 A2 EP1050669 A2 EP 1050669A2
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EP
European Patent Office
Prior art keywords
camshaft
tappet
bearing
roller
camshafts
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
EP00108823A
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German (de)
French (fr)
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EP1050669A3 (en
EP1050669B1 (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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Publication of EP1050669B1 publication Critical patent/EP1050669B1/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 relates to a device for actuation of a valve with a variable stroke on internal combustion engines according to the preamble of claim 1.
  • a device of this type is DE 35 31 000 described.
  • Actuating lever designed as a balance beam, which itself extends across the valve to be actuated.
  • the two Camshafts run on both sides above the balance beam the valve axis.
  • the two camshafts are arranged coaxially to one another and the operating lever is via an intermediate lever hinged to the cylinder head.
  • the invention has for its object a Generic device to create that against a Engine type with the usual overhead camshaft with only minor changes to the cylinder head and without significant changes in manufacturing gets along.
  • the first camshaft at the location in the cylinder head be arranged on which in a conventional Cylinder head with overhead camshaft this too located.
  • the second camshaft is relative can be easily stored above the first camshaft, in which the first camshaft bearing cap with another Bearing is provided, which with an additional Bearing cover is completed.
  • the connecting part Since this only requires train is, it can be made very slim, so that the camshafts are installed close to each other can.
  • the connecting part By designing the connecting part as a fork can the control cam of the second camshaft in the Immerse the space between the forks. This measure also works has a positive impact on the compact design.
  • a first camshaft 1 and a second Camshaft 2 are in a cylinder head 3 of an internal combustion engine rotatably mounted.
  • Camshafts 1, 2 are common from the crankshaft of the internal combustion engine Way driven so that they are z. B. at a Four-stroke engine with half crankshaft speed rotate.
  • a device known per se provided with which the camshafts 1, 2 are mutually adjustable in their angular position.
  • the first camshaft 1 is with an actuating cam 4 and two this locking cam 4 adjacent locking circles 5 forming discs 6 provided ( Figure 6).
  • the tappet 8 lies with the inner surface of its bottom 9 on the shaft 10 of a gas exchange channel 11 controlling Valve on, which by a closing spring 12 in Closed position is maintained.
  • the second camshaft 2 arranged above the first camshaft 1 and spaced from it. It is provided with an adjusting cam 13.
  • the connecting part 18 is fork-shaped ( Figure 2). Two starting from camp 17 Fork parts 20 extend between the two Camshafts 1, 2; and facing away from their bearing 17 At the end of 28 they carry an axially three-part roller 22 first roller part 22.1 is located between the two Fork parts 20 in a fork space 23 and is in Active connection with the control cam 13 of the second camshaft 2.
  • Two other roller parts 22.2 are outside of Fork space 23 coaxial with the first roller part 22.1 arranged ( Figure 2). They lie on the of the discs 6 of the first camshaft 1 formed locking circle 5 on ( Figure 6).
  • the bearing 17 is opposite Connection part 18 adjustable to the game adjust between the parts and compensate the tolerances to be able to.
  • the first camshaft 1 is in the cylinder head 3 stored in the usual way.
  • a camshaft bearing cap 24, which is attached to the cylinder head 3 with bearing cap screws 25 is the top half of the bearing of the first Camshaft 1 while the lower half of the bearing is formed by the cylinder head 3.
  • the Camshaft bearing cap 24 the lower half of the bearing for the second camshaft 2, during its upper half is formed by a further bearing cover 26 which with Screws 27 is held on the camshaft bearing cover 24 ( Figure 8).
  • FIG. 4 shows the device in one position, at which a maximum valve lift x is achieved.
  • the Control cam 13 of the second camshaft 2 has the roller 22 on the connecting part 18 on the locking circle 5 of the first Camshaft 1 maximum to the left (refer to Figure 4) deflected. This is the end point 16 of the Actuating lever 14 on the bearing 17 of the connecting part 18 is supported, shifted to the left.
  • the actuation cam 4 of the first camshaft 1 acts on the Roll 19 of the actuating lever 14 so that this around the end point 15 pivots counterclockwise and while simultaneously the tappet 8 and with this Valve moves against the force of the closing spring 12 so that the valve is opened to the maximum.
  • the control cam 13 on the second camshaft 2 dips between the two fork parts 20 and between the two discs 6 carrying the locking circles 5 the first camshaft 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The device is operating a valve with variable lift in an internal combustion engine. Two revolving and adjustable camshafts involved together with a valve activated by a closure spring, an axial tappet acting on the valve shaft end and an operating lev activated by both camshafts and affecting the cup tappet. The first camshaft (1) is arranged above the tappet (8) and is provided with an operating cam (4). The second camshaft (2) arranged above the first camshaft and is provided with an adjustment cam (13). The operating lever (14) is pivotably located at first end point (15) on the tappet and supports pivotably with the other end point (16) on a bearing (17) of a connecting part ( Centrally, the operating lever is in effective connection with the operating cam (4) of the first camshaft. The connecting part extends crossways between the two camshafts and supports a roller (22) at its end opposite to the bearing.

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 of a valve with a variable stroke on 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 DE 35 31 000 described. In this known device Actuating lever designed as a balance beam, which itself extends across the valve to be actuated. The two Camshafts run on both sides above the balance beam the valve axis. In another embodiment the two camshafts are arranged coaxially to one another and the operating lever is via an intermediate lever hinged to the cylinder head. Through these arrangements there is the significant difficulty that a significant change of the usual cylinder head structure is required to install the camshafts can. The installation space required is impaired the arrangement of the gas routing channels in the cylinder head significantly.

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, the operating lever with a special crank hinged to the cylinder head or in a guideway guided under spring load. A disadvantage here is the component effort.

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 has for its object a Generic device to create that against a Engine type with the usual overhead camshaft with only minor changes to the cylinder head and without significant changes in manufacturing gets along.

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 Features 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.Due to the two camshafts lying on top of each other can the first camshaft at the location in the cylinder head be arranged on which in a conventional Cylinder head with overhead camshaft this too located. The second camshaft is relative can be easily stored above the first camshaft, in which the first camshaft bearing cap with another Bearing 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.Extends between the two camshafts the connecting part. Since this only requires train is, it can be made very slim, so that the camshafts are installed close to each other can. By designing the connecting part as a fork can the control cam of the second camshaft in the Immerse the space between the forks. This measure also works has 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 necessary so that no space is provided for this 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 essentially based on the principle of the addition of two actuation paths acting independently of one another, is evident from the exemplary 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;
Fig. 3:
a view of the operating lever of the device of Figure 1 in the direction of arrow B;
Fig. 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 with 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. Camshafts 1, 2 are common from the crankshaft of the internal combustion engine Way driven so that they are z. B. at a Four-stroke engine with half crankshaft speed rotate. In addition, a device known per se provided with which the camshafts 1, 2 are mutually adjustable in their angular position. The first camshaft 1 is with an actuating cam 4 and two this locking cam 4 adjacent locking circles 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 and from the first camshaft 1 spaced is located in a bore 7 of the Cylinder head 3 sliding tappets 8. The tappet 8 lies with the inner surface of its bottom 9 on the shaft 10 of a gas exchange channel 11 controlling Valve on, which by a closing spring 12 in Closed position is maintained. Above the first camshaft 1 and spaced from it is the second camshaft 2 arranged. It is provided with an adjusting 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 one side Bearing 17 of a connecting part 18 supported. The Actuating lever 14 bears centrally between its end points 15, 16 a roller 19, the 4 on the actuating cam first camshaft 1 is present. The connecting part 18 is fork-shaped (Figure 2). Two starting from camp 17 Fork parts 20 extend between the two Camshafts 1, 2; and facing away from their bearing 17 At the end of 28 they carry an axially three-part roller 22 first roller part 22.1 is located between the two Fork parts 20 in a fork space 23 and is in Active connection with the control cam 13 of the second camshaft 2. Two other roller parts 22.2 are outside of Fork space 23 coaxial with the first roller part 22.1 arranged (Figure 2). They lie on the of the discs 6 of the first camshaft 1 formed locking circle 5 on (Figure 6). The bearing 17 is opposite Connection part 18 adjustable to the game adjust between the parts and compensate 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 3 stored in the usual way. A camshaft bearing cap 24, which is attached to the cylinder head 3 with bearing cap screws 25 is the top half of the bearing of the first Camshaft 1 while the lower half of the bearing is formed by the cylinder head 3. At the same time, the Camshaft bearing cap 24 the lower half of the bearing for the second camshaft 2, during its upper half is formed by a further bearing cover 26 which with Screws 27 is held on the camshaft bearing cover 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 one position, at which a maximum valve lift x is achieved. The Control cam 13 of the second camshaft 2 has the roller 22 on the connecting part 18 on the locking circle 5 of the first Camshaft 1 maximum to the left (refer to Figure 4) deflected. This is the end point 16 of the Actuating lever 14 on the bearing 17 of the connecting part 18 is supported, shifted to the left. The actuation cam 4 of the first camshaft 1 acts on the Roll 19 of the actuating lever 14 so that this around the end point 15 pivots counterclockwise and while simultaneously the tappet 8 and with this Valve moves against the force of the closing spring 12 so that the valve is opened to the 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 operating lever 14 with the tappet 8 only linearly along the center line the hole 7 can move, which occurs Movement of the other end point 16 by one Pivotal movement of the connecting part 18 around the center the role 22 added.

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 control cam 13 on the second camshaft 2 dips between the two fork parts 20 and between the two discs 6 carrying the locking circles 5 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 compared to the first Camshaft 1 rotated by an angular amount, such as This is shown in Figure 5, then is due to the actuated Valve a zero stroke ahead. The control cam 13 of the second Camshaft 2 now acts on the roller 22 of the connecting part 18 not. This can be so through the the operating lever 14 and the connecting part 18 transmitted Force of the closing spring 12 on the detent circle 5 move to the right (refer to Figure 5). In the same The bearing 17 of the connecting part also moves in this manner 18 and with it the end point 16 of the actuating lever 14 to the right. At the same time, the roller 19 of the actuating lever is located 14 on the actuating cam 4 of the first camshaft 1 still on. Despite the maximum stroke of the actuating cam 4 becomes the end point on the tappet 8 15 of the operating 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 control cam 13 and the locking circle 5 chosen so that it is always smaller than the diameter of the Roll 22 of the connecting part 18 is. This ensures that the roller 22 on its design 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.By arranging the connecting part 18th between the two camshafts 1, 2 in connection with the storage of the actuating lever 14 on the tappet 8 becomes a very compact design of the device possible. As can be seen in FIGS. 7 and 8, the Device according to the invention with relatively little effort can be adapted to a conventional cylinder head.

Claims (7)

Vorrichtung zur Betätigung eines Ventile mit variablem Hub an Brennkraftmaschinen, umfassend zwei umlaufende und gegeneinander verstellbare Nockenwellen, ein von einer Schließfeder beaufschlagtes Ventil, einen auf ein Schaftende des Ventils wirkenden axial geführten Stößel sowie einen von beiden Nockenwellen beaufschlagten auf den Tassenstößel einwirkenden Betätigungshebel, dadurch gekennzeichnet, daß die erste Nockenwelle (1) oberhalb des Stößels (8) angeordnet und mit einem Betätigungsnocken (4) versehen ist und die zweite Nockenwelle (2) oberhalb der ersten Nockenwelle (1) angeordnet und mit einem Stellnocken (13) versehen ist, der Betätigungshebel (14) an einem ersten Endpunkt (15) schwenkbar auf dem Stößel (8) gelagert ist, sich mit dem anderen Endpunkt (16) allseits schwenkbar an einem Lager (17) eines Verbindungsteiles (18) abstützt und mittig mit dem Betätigungsnocken (4) der ersten Nockenwelle (1) in Wirkverbindung steht, wobei sich das Verbindungsteil (18) quer zwischen den beiden Nockenwellen (1, 2) erstreckt und an seinem dem Lager (17) gegenüberliegenden Ende (21) eine Rolle (22) trägt, welche an einem Rastkreis (5) der ersten Nockenwelle (1) und einem Stellnocken (13) der zweiten Nockenwelle (2) anliegt, wobei der Rastkreis (5) und der Stellnocken (13) in jeder Stellung der beiden Nockenwellen (1, 2) zueinander einen Abstand aufweisen, der kleiner ist als der Durchmesser der Rolle (22).Device for actuating a valve with a variable stroke on internal combustion engines, comprising two revolving and mutually adjustable camshafts, a valve acted upon by a closing spring, an axially guided tappet acting on a shaft end of the valve and an actuating lever acting on the bucket tappet and acted on by both camshafts, characterized in that that the first camshaft (1) is arranged above the tappet (8) and is provided with an actuating cam (4) and the second camshaft (2) is arranged above the first camshaft (1) and is provided with an actuating cam (13) which Actuating lever (14) is pivotally mounted on the plunger (8) at a first end point (15), is pivotally supported on a bearing (17) of a connecting part (18) with the other end point (16) and is centered with the actuating cam (4 ) the first camshaft (1) is in operative connection, the connecting part (18) q Extends between the two camshafts (1, 2) and carries at its end (21) opposite the bearing (17) a roller (22) which on a detent circle (5) of the first camshaft (1) and a control cam (13) of the second camshaft (2), the detent circle (5) and the actuating cam (13) being at a distance from each other of the two camshafts (1, 2) which is smaller than the diameter of the roller (22). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Verbindungsteil (18) gabelförmig ausgebildet ist, wobei am Grund der Gabel ein Lager (17) für den Betätigungshebel (14) angeordnet ist, an den Enden (21) der Gabelteile (20) Lager für die Rolle (22) gebildet sind, die Rolle (22) in axialer Richtung derart dreigeteilt ist, daß ein sich zwischen den Gabelteilen (20) befindliches mittleres Rollenteil (22.1) mit dem in den Gabelzwischenraum (23) eintauchenden Stellnocken (13) der zweiten Nockenwelle (2) in Wirkverbindung steht und jeweils ein beidseits und außerhalb des Gabelzwischenraumes (23) befindlicher Rollenteil (22.2) auf dem Rastkreis (5) der ersten Nockenwelle (1) aufliegt.Apparatus according to claim 1, characterized in that the connecting part (18) is fork-shaped, a bearing (17) for the actuating lever (14) being arranged at the base of the fork and bearings for at the ends (21) of the fork parts (20) the roller (22) is formed, the roller (22) is divided in three in the axial direction in such a way that an intermediate roller part (22.1) located between the fork parts (20) with the adjusting cams (13) of the second, which plunge into the fork space (23) Camshaft (2) is in operative connection and a roller part (22.2) located on both sides and outside the fork gap (23) rests on the detent circle (5) of the first camshaft (1). Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Betätigungsnocken (4) zwischen zwei jeweils den Rastkreis (5) bildenden Scheiben (6) der ersten Nockenwelle (1) angeordnet ist.Device according to claims 1 and 2, characterized in that the actuating cam (4) is arranged between two disks (6) of the first camshaft (1) each forming the latching circle (5). Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Lager (17) des Betätigungshebels (14) am Verbindungsteil (18) in axialer Richtung des Verbindungssteiles (18) verstellbar ausgebildet ist.Device according to one of claims 1 to 3, characterized in that the bearing (17) of the actuating lever (14) on the connecting part (18) is designed to be adjustable in the axial direction of the connecting part (18). Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Betätigungshebel (14) mittig über eine am Betätigungshebel (14) gelagerte Rolle (19) mit dem Betätigungsnocken (4) in Wirkverbindung steht.Device according to one of claims 1 to 4, characterized in that the actuating lever (14) is operatively connected to the actuating cam (4) centrally via a roller (19) mounted on the actuating lever (14). Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Stößel (8) ein Tassenstößel ist.Device according to one of claims 1 to 5, characterized in that the tappet (8) is a cup tappet. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die erste oberhalb des Stößels (8) angeordnete Nockenwelle (1) von Nockenwellenlagerdeckeln (24) gehalten ist, die an ihrer Oberseite Lagerschalen zur Aufnahme der zweiten Nockenwelle (2) tragen, die mit einem weiteren Lagerdeckel (26) abgeschlossen sind.Device according to one of claims 1 to 6, characterized in that the first camshaft (1) arranged above the tappet (8) is held by camshaft bearing covers (24) which support bearing shells on their upper side for receiving the second camshaft (2) which are completed with a further bearing cover (26).
EP00108823A 1999-05-05 2000-04-26 Valve driving arrangement with variable lift for an internal combustion engine Expired - Lifetime EP1050669B1 (en)

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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

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WO2003016684A1 (en) * 2001-08-18 2003-02-27 Mechadyne Plc Adjustable valve control system with twin cams and a cam lift summation lever
EP1445434A1 (en) * 2003-02-04 2004-08-11 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with valve lift adjustment
WO2008008583A1 (en) * 2006-07-10 2008-01-17 Borgwarner Inc Valve event duration control via secondary closing camshaft with phaser
EP2163736A1 (en) * 2001-11-06 2010-03-17 ThyssenKrupp Presta TecCenter AG Variable lifting valve control
CN102061952A (en) * 2010-10-08 2011-05-18 奇瑞汽车股份有限公司 Camshaft bearing seat
CN102966391A (en) * 2012-11-25 2013-03-13 天津大学 Swinging arm mechanism controlled by using double cams

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DE10235403A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
DE10303601A1 (en) 2003-01-30 2004-08-12 Mahle Ventiltrieb Gmbh valve control
DE102006018512A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Roller element for a pivotable machine part
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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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016684A1 (en) * 2001-08-18 2003-02-27 Mechadyne Plc Adjustable valve control system with twin cams and a cam lift summation lever
EP2163736A1 (en) * 2001-11-06 2010-03-17 ThyssenKrupp Presta TecCenter AG Variable lifting valve control
EP1445434A1 (en) * 2003-02-04 2004-08-11 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with valve lift adjustment
WO2008008583A1 (en) * 2006-07-10 2008-01-17 Borgwarner Inc Valve event duration control via secondary closing camshaft with phaser
CN102061952A (en) * 2010-10-08 2011-05-18 奇瑞汽车股份有限公司 Camshaft bearing seat
CN102966391A (en) * 2012-11-25 2013-03-13 天津大学 Swinging arm mechanism controlled by using double cams

Also Published As

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DE50009324D1 (en) 2005-03-03
DE19920512A1 (en) 2000-11-09
EP1050669A3 (en) 2001-05-16
EP1050669B1 (en) 2005-01-26

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