EP1022443A1 - Variable valve drive for internal combustion engine - Google Patents

Variable valve drive for internal combustion engine Download PDF

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Publication number
EP1022443A1
EP1022443A1 EP99100855A EP99100855A EP1022443A1 EP 1022443 A1 EP1022443 A1 EP 1022443A1 EP 99100855 A EP99100855 A EP 99100855A EP 99100855 A EP99100855 A EP 99100855A EP 1022443 A1 EP1022443 A1 EP 1022443A1
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EP
European Patent Office
Prior art keywords
valve
scanning
spring
rocker arm
camshafts
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Granted
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EP99100855A
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German (de)
French (fr)
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EP1022443B1 (en
Inventor
Günter Bartsch
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Priority to DE59900189T priority Critical patent/DE59900189D1/en
Priority to EP19990100855 priority patent/EP1022443B1/en
Publication of EP1022443A1 publication Critical patent/EP1022443A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015Modifications 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
    • F01L13/0036Modifications 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
    • F01L13/0047Modifications 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

Definitions

  • the invention relates to a device for variable Control of a valve of an internal combustion engine, with two camshafts to open and close the valve, their Phase relationship to each other for changing stroke and / or Opening duration of the valve is changeable, also with a Scanning device for simultaneous scanning of the cam contours both camshafts and with an actuator to transmit the movement of the scanner the valve, the valve being in by a valve spring Is closed.
  • Such devices are for example from the EP 0 659 232 B1 known.
  • Actuator as a rocker arm is on this one Slideway provided on which the scanning device back and forth is movably guided or stored.
  • Using a compression spring becomes the scanner on one of the camshafts kept in a defined facility.
  • This can be done in one Cylinder surface of an camshaft an additional stop element be stored with a circular body on the rocker arm and in the closed position of the valve is supported on a cylinder surface of the other camshaft.
  • the disadvantage of these previously known devices is that with linear sliding displacements the lubrication conditions are unfavorable and therefore friction and wear relative are high. In addition, increased friction also fuel consumption increases.
  • the rocker arm operates the valve and is on one End of the link lever rotatably mounted.
  • the link lever is fixed at the other end and is supported by a spring biased towards one of the camshafts. Training a rocker arm and the additional scanning device are expensive to manufacture and assemble.
  • the present invention has the object based on improving a generic device so that they are both low friction and easy to wear is trained.
  • this object is achieved in a device initially mentioned type solved in that the scanning device is rotatably attached to the end of an articulated rod, the other end rotatably attached to the actuator is.
  • the scanning device is advantageously on a Common axis arranged rollers formed. With this Measure is a simple rotatable attachment of the scanner reached at the end of the joint rod and thus the Manufacturing effort further reduced.
  • the scanning device is a favorable development of the invention by a spring device in contact with at least held a camshaft. As a result, the scanner is located in a defined position at all times.
  • a gear ratio between the movement of the scanner and the movement of the one resting on the valve Point of contact of the rocker arm can be determined, whereby the closer the joint rod is, the greater the ratio is attached to the fixed mounting of the rocker arm.
  • the speed of the occurring rotary movement influenced, which in turn the resulting friction can be reduced.
  • the scanning device is very particularly preferred by a substantially in the longitudinal direction of the rocker arm spring force acting on at least one camshaft held. Using these measures will be simple Maintain a defined position of the scanner.
  • the actuator can be designed as a tappet be and the joint rod in the extension of the central axis of the valve on the tappet.
  • the spring device has a spiral spring surrounding the valve spring, one end of which is fixed to the valve, the other end of which rests on the tappet and the scanning device stops in contact with both camshafts.
  • a gap to the second camshaft is also avoided, so that the attachment of the scanner to both Camshafts is defined.
  • the rotatable fastenings of the scanning and actuator on the joint rod as a needle bearing be trained.
  • roller bearings or ball bearings- needle bearings are special suitable for shock loads and swiveling movements and also lighter, which leads to a not inconsiderable weight saving leads.
  • Fig. 1 of an inventive Device has two camshafts 1a, 1b, as Scanning device a roll package 2, as an actuating device a rocker arm 3 and an articulated rod 4, by means of which the roller set 2 is connected to the rocker arm 3 is.
  • the two camshafts 1a, 1b have cam contours 5a, 5b on, each an area 6 small increase to Closing the valve 7 and an area 8 of greater increase train to open the valve 7. Both cam contours 5a, 5b can abut the roll package 2 at the same time, so that the roller set 2 is the sum of the two cam contours 5a, 5b scans and over the joint rod 4 and the Rocker arm 3 passes on to the valve 7.
  • By change the phase relationship of the two camshafts 1a, 1b to each other can by overlapping the two cam contours 5a, 5b resulting stroke and / or the resulting opening time of the valve 7 can be changed, whereby a variable Control of the valve 7 is enabled.
  • the role package 2 exists in the example shown (cf. 4) from three mutually parallel rollers 2a, 2b, 2c, those on a common axis 9 at a distance 10 from each other are arranged in the longitudinal axis direction.
  • the joint rod 4 is U-shaped or fork-shaped, wherein the two legs 11, 12 of the U are in the two distances 10a, 10b or spaces between the rollers 2a, 2b, 2c and the axis 9 in through openings store rotatable.
  • the base of the U extends parallel to axis 9, a further passage opening through which through which a bolt 13 runs with which the articulated rod 4 is rotatably mounted on the rocker arm 3 (Fig. 1).
  • the rocker arm 3 is rotatably mounted at one end 14 and lies with its other end 15 on the valve 7 on. Between the support point 14 of the rocker arm 3 and whose fixed bearing 15, the pivot bearing 13 is arranged, with which the articulated rod 4 on the rocker arm 3 is rotatable is attached.
  • the roller package 2 is in contact with a compression spring 16 held on one of the camshafts la.
  • the compression spring 16 can be designed, for example, as a spiral spring rests with one end on the roll package 2 and their the other end is supported on an abutment 17 which molded onto the fixed end 15 of the rocker arm 3 is.
  • the valve 7 is designed as a poppet valve, which in a Valve guide 18 is slidably mounted and by one Valve spring 19 for contacting a (not shown) Valve seat is biased.
  • the valve spring 19 is a spiral spring trained, one end of which is on the valve guide 18 is stationary and the other end against the Underside of a valve spring plate attached to the valve stem 20 presses.
  • a stop 21 is attached to the free end of the rocker arm 3, which rests on a cylindrical surface of a camshaft la and with which the valve 7 in its closed state is held in a defined position.
  • Fig. 2 In the embodiment shown in Fig. 2 is as Actuator provided a tappet 22, the open side facing the camshafts la, 1b.
  • the Articulated rod 4 is on the tappet 22 by means of a Pivot bearing 13 attached to the bottom 23 of the tappet 22 is arranged.
  • a second coil spring 24 is provided, which Valve spring 19 encloses concentrically.
  • This second coil spring 24 is at one end - like the valve spring 19 - mounted on the valve guide 18 stationary and lies with her the other end on the side of the valve 7 facing the Bottom 23 of the tappet 22 on. Through this second coil spring 24 becomes the tappet 22 and with it the joint rod 4 and the roller set 2 to the camshafts 1a, 1b pressed, whereby the roller set 2 always on both camshafts 1a, 1b is present.
  • FIGS Another exemplary embodiment is shown in FIGS shown with a tappet 25 as an actuator.
  • the open side of the tappet 25 is here facing the valve 7.
  • the pivot bearing 13 for connecting the Articulated rod 4 is on the camshafts la, 1b facing Side of the bottom 23 of the tappet 25 attached.
  • the roller set 2 is pressed onto one of the camshafts la.
  • the spiral spring 26 is V-shaped, wherein it is guided around the pivot bearing 13 and with the outside a leg 27 on the roll package 2 and with the outside of the other leg 28 on the bottom 23 of the tappet 25 is present.

Abstract

The variable control device for a valve (7) has a monitoring device (2) for the simultaneous checking of the cam contours of both camshafts, and an operating device (3) to transmit the movement of the monitoring device to the valve. The monitoring device is fixed to one end of a pivoted rod (4), the other end of which can turn on the operating device.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur variablen Steuerung eines Ventils einer Brennkraftmaschine, mit zwei Nockenwellen zum Öffnen und Schließen des Ventils, deren Phasenlage zueinander zur Veränderung von Hub und/oder Öffnungsdauer des Ventils veränderbar ist, ferner mit einer Abtasteinrichtung zum gleichzeitigen Abtasten der Nockenkonturen beider Nockenwellen und mit einer Betätigungseinrichtung zum Übertragen der Bewegung der Abtasteinrichtung auf das Ventil, wobei das Ventil durch eine Ventilfeder in Schließstellung vorgespannt ist.The invention relates to a device for variable Control of a valve of an internal combustion engine, with two camshafts to open and close the valve, their Phase relationship to each other for changing stroke and / or Opening duration of the valve is changeable, also with a Scanning device for simultaneous scanning of the cam contours both camshafts and with an actuator to transmit the movement of the scanner the valve, the valve being in by a valve spring Is closed.

Derartige Vorrichtungen sind beispielsweise aus der EP 0 659 232 B1 bekannt. In Verbindung mit der Ausbildung der Betätigungseinrichtung als Schlepphebel ist auf diesem eine Gleitbahn vorgesehen, auf der die Abtasteinrichtung hin- und herbeweglich geführt bzw. gelagert ist. Mittels einer Druckfeder wird die Abtasteinrichtung an einer der Nockenwellen in einer definierten Anlage gehalten. Hierbei kann in einer Zylinderfläche der einen Nockenwelle ein zusätzliches Anschlagelement gelagert sein, das sich mit einem Kreiskörper am Schlepphebel und in Schließstellung des Ventils zusätzlich an einer Zylinderfläche der anderen Nockenwelle abstützt. Nachteilig ist bei diesen vorbekannten Vorrichtungen, daß bei linearen Gleitverschiebungen die Schmierbedingungen ungünstig sind und dadurch Reibung und Verschleiß relativ hoch sind. Zudem wird durch eine erhöhte Reibung auch der Kraftstoffverbrauch erhöht.Such devices are for example from the EP 0 659 232 B1 known. In connection with the training of Actuator as a rocker arm is on this one Slideway provided on which the scanning device back and forth is movably guided or stored. Using a compression spring becomes the scanner on one of the camshafts kept in a defined facility. This can be done in one Cylinder surface of an camshaft an additional stop element be stored with a circular body on the rocker arm and in the closed position of the valve is supported on a cylinder surface of the other camshaft. The disadvantage of these previously known devices is that with linear sliding displacements the lubrication conditions are unfavorable and therefore friction and wear relative are high. In addition, increased friction also fuel consumption increases.

Bei einer alternativen Ausführungsform sind zwei Abtasteinrichtungen vorgesehen, deren eine an einem Schwinghebel angebracht ist und deren andere von einem Anlenkhebel getragen wird. Der Schwinghebel betätigt das Ventil und ist an einem Ende des Anlenkhebels drehbar gelagert. Der Anlenkhebel ist am anderen Ende ortsfest gelagert und wird von einer Feder zu einer der Nockenwellen hin vorgespannt. Die Ausbildung eines Schwinghebels und der zusätzlichen Abtasteinrichtung sind fertigungs- und montageaufwendig.In an alternative embodiment, there are two sensing devices provided, one attached to a rocker arm and the other is carried by a link lever becomes. The rocker arm operates the valve and is on one End of the link lever rotatably mounted. The link lever is fixed at the other end and is supported by a spring biased towards one of the camshafts. Training a rocker arm and the additional scanning device are expensive to manufacture and assemble.

Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung so zu verbessern, daß sie sowohl reibungs- und verschleißarm als auch einfach ausgebildet ist.In contrast, the present invention has the object based on improving a generic device so that they are both low friction and easy to wear is trained.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, daß die Abtasteinrichtung am Ende einer Gelenkstange drehbar befestigt ist, deren anderes Ende an der Betätigungseinrichtung drehbar befestigt ist.According to the invention, this object is achieved in a device initially mentioned type solved in that the scanning device is rotatably attached to the end of an articulated rod, the other end rotatably attached to the actuator is.

Bei einer erfindungsgemäßen Vorrichtung ist die die beiden Nockenwellen gleichzeitig abtastende Abtasteinrichtung nur über eine einfache Gelenkstange in der Art eines Pleuels mit der Betätigungseinrichtung verbunden. Hierdurch wird zum einen die Anzahl der erforderlichen Bauteile gering gehalten und zudem deren konstruktive Ausbildung sehr einfach. Zum anderen bewegt sich die Abtasteinrichtung auf einer kreisförmigen Bahn um den zwischen Gelenkstange und Betätigungseinrichtung ausgebildeten Gelenkpunkt, wodurch ausschließlich Drehbewegungen auftreten. So ergeben sich bei einfachem Aufbau Reibleistungsvorteile und Verschleißminderung.In a device according to the invention, these are the two Camshafts scanning device at the same time only with a simple connecting rod in the manner of a connecting rod connected to the actuator. This will, on the one hand the number of components required was kept low and their constructive training is very simple. To the another, the scanner moves on a circular Path around the between articulated rod and actuator trained hinge point, which means exclusively Rotational movements occur. This results in simple Structure of friction benefits and wear reduction.

Vorteilhafterweise ist die Abtasteinrichtung durch auf einer gemeinsamen Achse angeordnete Rollen gebildet. Mit dieser Maßnahme wird eine einfache drehbare Befestigung der Abtasteinrichtung am Ende der Gelenkstange erreicht und somit der Fertigungsaufwand weiter reduziert.The scanning device is advantageously on a Common axis arranged rollers formed. With this Measure is a simple rotatable attachment of the scanner reached at the end of the joint rod and thus the Manufacturing effort further reduced.

In günstiger Weiterbildung der Erfindung ist die Abtasteinrichtung durch eine Federeinrichtung in Anlage an mindestens einer Nockenwelle gehalten. Hierdurch befindet sich die Abtasteinrichtung zu jeder Zeit in einer definierten Lage.The scanning device is a favorable development of the invention by a spring device in contact with at least held a camshaft. As a result, the scanner is located in a defined position at all times.

In einer bevorzugten Ausführungsform der Erfindung ist das Betätigungselement als Schlepphebel ausgebildet und die Gelenkstange zwischen der Auflage des Schlepphebels auf dem Ventil und der ortsfesten Lagerung des Schlepphebels an diesem drehbar befestigt. Mit diesen Maßnahmen kann zum einen ein Übersetzungsverhältnis zwischen der Bewegung der Abtasteinrichtung und der Bewegung des auf dem Ventil aufliegenden Auflagepunktes des Schlepphebels bestimmt werden, wobei die Übersetzung umso größer ist, je näher die Gelenkstange an der ortsfesten Lagerung des Schlepphebels befestigt ist. Zum anderen wird mit diesem Abstand die Geschwindigkeit der auftretenden Drehbewegung beeinflußt, wodurch wiederum die entstehende Reibung verringert werden kann.In a preferred embodiment of the invention that is Actuator designed as a rocker arm and the joint rod between the rest of the rocker arm on the Valve and the fixed mounting of the rocker arm on this rotatably attached. With these measures, on the one hand a gear ratio between the movement of the scanner and the movement of the one resting on the valve Point of contact of the rocker arm can be determined, whereby the closer the joint rod is, the greater the ratio is attached to the fixed mounting of the rocker arm. On the other hand, with this distance, the speed of the occurring rotary movement influenced, which in turn the resulting friction can be reduced.

Dabei ist ganz besonders bevorzugt die Abtasteinrichtung durch eine im wesentlichen in Längsrichtung des Schlepphebels wirkende Federkraft in Anlage an mindestens einer Nokkenwelle gehalten. Mit diesen Maßnahmen wird auf einfache Weise eine definierte Lage der Abtasteinrichtung beibehalten.The scanning device is very particularly preferred by a substantially in the longitudinal direction of the rocker arm spring force acting on at least one camshaft held. Using these measures will be simple Maintain a defined position of the scanner.

In einer ebenfalls bevorzugten Ausgestaltung der Erfindung kann das Betätigungselement als Tassenstößel ausgebildet sein und die Gelenkstange in Verlängerung der Mittenachse des Ventils am Tassenstößel angreifen. Dies führt zu einer kompakteren Ausbildung einer erfindungsgemäßen Vorrichtung. Ihr Bauraumbedarf wird soweit minimiert, daß sie in einen gewöhnlichen Tassenstößelmotor ohne Rückwirkung auf die Lage des Einspritzventils und die Einlaßkanalkonfiguration eingebaut werden kann. Auf diese Weise kann ein Motor, der bereits einen Stößel-Ventiltrieb aufweist, durch einfaches Austauschen in einen Motor mit variabler Ventilsteuerung geändert werden. Mit relativ wenig Aufwand kann so aus einem Motor ohne variable Ventilsteuerung ein höherwertiger Motor geschaffen werden. In a likewise preferred embodiment of the invention the actuator can be designed as a tappet be and the joint rod in the extension of the central axis of the valve on the tappet. This leads to a more compact design of a device according to the invention. Your space requirement is minimized to the extent that they are in one ordinary bucket tappet motor without affecting the position of the injector and the intake port configuration can be. This way an engine that is already has a tappet valve train, by simple Exchange changed to an engine with variable valve timing become. With relatively little effort, one can Engine without variable valve control is a higher quality engine be created.

Ganz besonders vorteilhaft ist es dabei, wenn die Federeinrichtung eine die Ventilfeder umgebende Spiralfeder aufweist, deren eines Ende zum Ventil ortsfest gehalten ist, deren anderes Ende am Tassenstößel anliegt und die die Abtasteinrichtung in Anlage an beiden Nockenwellen hält. Hierdurch wird eine Klaffung auch zur zweiten Nockenwelle vermieden, so daß die Anlage der Abtasteinrichtung an beiden Nockenwellen definiert ist.It is particularly advantageous if the spring device has a spiral spring surrounding the valve spring, one end of which is fixed to the valve, the other end of which rests on the tappet and the scanning device stops in contact with both camshafts. Hereby a gap to the second camshaft is also avoided, so that the attachment of the scanner to both Camshafts is defined.

Vorzugsweise sind die drehbaren Befestigungen der Abtast- und Betätigungseinrichtung an der Gelenkstange als Gleitlager ausgebildet.The rotatable fastenings of the scanning and actuator on the joint rod as a plain bearing educated.

In einer alternativen, ebenfalls bevorzugten Ausführungsform der Erfindung können die drehbaren Befestigungen der Abtast- und Betätigungseinrichtung an der Gelenkstange als Nadellager ausgebildet sein. Im Vergleich zu anderen Wälzlagern -z. B. Rollenlagern oder Kugellagern- sind Nadellager besonders für Stoßbelastungen und Schwenkbewegungen geeignet und außerdem leichter, was zu einer nicht unerheblichen Gewichtsersparnis führt.In an alternative, also preferred embodiment the rotatable fastenings of the scanning and actuator on the joint rod as a needle bearing be trained. Compared to other rolling bearings -z. B. roller bearings or ball bearings- needle bearings are special suitable for shock loads and swiveling movements and also lighter, which leads to a not inconsiderable weight saving leads.

Nachfolgend wird die Erfindung anhand der Zeichnungen beispielshalber noch näher erläutert. Es zeigen:

Fig. 1
eine Vorderansicht einer ersten Ausführungsform einer erfindungsgemäßen Vorrichtung im eingebauten Zustand;
Fig. 2
eine der Fig. 1 ähnliche Ansicht einer zweiten Ausführungsform einer erfindungsgemäßen Vorrichtung;
Fig. 3
eine der Fig. 1 ähnliche Ansicht einer dritten Ausführungsform einer erfindungsgemäßen Vorrichtung; und
Fig. 4
eine Teil-Seitenansicht der Ausführungsform aus Fig. 3.
The invention is explained in more detail below by way of example with reference to the drawings. Show it:
Fig. 1
a front view of a first embodiment of a device according to the invention in the installed state;
Fig. 2
a view similar to Figure 1 of a second embodiment of a device according to the invention.
Fig. 3
a view similar to Figure 1 of a third embodiment of a device according to the invention. and
Fig. 4
3 shows a partial side view of the embodiment from FIG. 3.

Das in Fig. 1 dargestellte Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung weist zwei Nockenwellen 1a, 1b, als Abtasteinrichtung ein Rollenpaket 2, als Betätigungseinrichtung einen Schlepphebel 3 sowie eine Gelenkstange 4 auf, mittels der das Rollenpaket 2 mit dem Schlepphebel 3 verbunden ist.The embodiment shown in Fig. 1 of an inventive Device has two camshafts 1a, 1b, as Scanning device a roll package 2, as an actuating device a rocker arm 3 and an articulated rod 4, by means of which the roller set 2 is connected to the rocker arm 3 is.

Die beiden Nockenwellen 1a, 1b weisen Nockenkonturen 5a, 5b auf, die jeweils einen Bereich 6 geringer Erhöhung zum Schließen des Ventils 7 und einen Bereich 8 größerer Erhöhung zum Öffnen des Ventils 7 ausbilden. Beide Nockenkonturen 5a, 5b können gleichzeitig an dem Rollenpaket 2 anliegen, so daß das Rollenpaket 2 die Summe der beiden Nockenkonturen 5a, 5b abtastet und über die Gelenkstange 4 und den Schlepphebel 3 an das Ventil 7 weitergibt. Durch Veränderung der Phasenlage der beiden Nockenwellen 1a, 1b zueinander kann der durch die Überlagerung der beiden Nockenkonturen 5a, 5b resultierende Hub und/oder die resultierende Öffnungsdauer des Ventils 7 verändert werden, wodurch eine variable Steuerung des Ventils 7 ermöglicht ist.The two camshafts 1a, 1b have cam contours 5a, 5b on, each an area 6 small increase to Closing the valve 7 and an area 8 of greater increase train to open the valve 7. Both cam contours 5a, 5b can abut the roll package 2 at the same time, so that the roller set 2 is the sum of the two cam contours 5a, 5b scans and over the joint rod 4 and the Rocker arm 3 passes on to the valve 7. By change the phase relationship of the two camshafts 1a, 1b to each other can by overlapping the two cam contours 5a, 5b resulting stroke and / or the resulting opening time of the valve 7 can be changed, whereby a variable Control of the valve 7 is enabled.

Das Rollenpaket 2 besteht im dargestellten Beispiel (vgl. Fig. 4) aus drei zueinander parallelen Rollen 2a, 2b, 2c, die auf einer gemeinsamen Achse 9 mit Abstand 10 voneinander in Achsenlängsrichtung angeordnet sind.The role package 2 exists in the example shown (cf. 4) from three mutually parallel rollers 2a, 2b, 2c, those on a common axis 9 at a distance 10 from each other are arranged in the longitudinal axis direction.

Die Gelenkstange 4 ist U- bzw. gabelförmig ausgebildet, wobei die beiden Schenkel 11, 12 des U sich in die beiden Abstände 10a, 10b bzw. Zwischenräume zwischen den Rollen 2a, 2b, 2c hineinerstrecken und die Achse 9 in Durchgangsöffnungen drehbar lagern. In der Basis des U erstreckt sich parallel zur Achse 9 eine weitere Durchgangsöffnung, durch die hindurch ein Bolzen 13 läuft, mit dem die Gelenkstange 4 drehbar am Schlepphebel 3 (Fig. 1) gelagert ist. The joint rod 4 is U-shaped or fork-shaped, wherein the two legs 11, 12 of the U are in the two distances 10a, 10b or spaces between the rollers 2a, 2b, 2c and the axis 9 in through openings store rotatable. In the base of the U extends parallel to axis 9, a further passage opening through which through which a bolt 13 runs with which the articulated rod 4 is rotatably mounted on the rocker arm 3 (Fig. 1).

Der Schlepphebel 3 ist am einen Ende 14 ortsfest drehbar gelagert und liegt mit seinem anderen Ende 15 auf dem Ventil 7 auf. Zwischen dem Auflagepunkt 14 des Schlepphebels 3 und dessen ortsfester Lagerung 15 ist das Drehlager 13 angeordnet, mit dem die Gelenkstange 4 am Schlepphebel 3 drehbar befestigt ist.The rocker arm 3 is rotatably mounted at one end 14 and lies with its other end 15 on the valve 7 on. Between the support point 14 of the rocker arm 3 and whose fixed bearing 15, the pivot bearing 13 is arranged, with which the articulated rod 4 on the rocker arm 3 is rotatable is attached.

Das Rollenpaket 2 wird mittels einer Druckfeder 16 in Anlage an einer der Nockenwellen la gehalten. Die Druckfeder 16 kann beispielsweise als Spiralfeder ausgebildet sein, die mit ihrem einen Ende an dem Rollenpaket 2 anliegt und deren anderes Ende sich an einem Widerlager 17 abstützt, das an dem ortsfest gelagerten Ende 15 des Schlepphebels 3 angeformt ist.The roller package 2 is in contact with a compression spring 16 held on one of the camshafts la. The compression spring 16 can be designed, for example, as a spiral spring rests with one end on the roll package 2 and their the other end is supported on an abutment 17 which molded onto the fixed end 15 of the rocker arm 3 is.

Das Ventil 7 ist als Tellerventil ausgebildet, das in einer Ventilführung 18 gleitbeweglich gelagert ist und von einer Ventilfeder 19 zur Anlage an einem (nicht dargestellten) Ventilsitz vorgespannt wird. Die Ventilfeder 19 ist als Spiralfeder ausgebildet, deren eines Ende an der Ventilführung 18 ortsfest gelagert ist und deren anderes Ende gegen die Unterseite eines am Ventilschaft angebrachten Ventilfedertellers 20 drückt.The valve 7 is designed as a poppet valve, which in a Valve guide 18 is slidably mounted and by one Valve spring 19 for contacting a (not shown) Valve seat is biased. The valve spring 19 is a spiral spring trained, one end of which is on the valve guide 18 is stationary and the other end against the Underside of a valve spring plate attached to the valve stem 20 presses.

Am freien Ende des Schlepphebels 3 ist ein Anschlag 21 angebracht, der an einer Zylinderfläche einer Nockenwelle la anliegt und mit dem das Ventil 7 in dessen geschlossenem Zustand in einer definierten Lage gehalten wird.A stop 21 is attached to the free end of the rocker arm 3, which rests on a cylindrical surface of a camshaft la and with which the valve 7 in its closed state is held in a defined position.

Bei dem in Fig. 2 dargestellten Ausführungsbeispiel ist als Betätigungseinrichtung ein Tassenstößel 22 vorgesehen, dessen offene Seite den Nockenwellen la, 1b zugewandt ist. Die Gelenkstange 4 ist an dem Tassenstößel 22 mittels eines Drehlagers 13 angebracht, das am Boden 23 des Tassenstößels 22 angeordnet ist.In the embodiment shown in Fig. 2 is as Actuator provided a tappet 22, the open side facing the camshafts la, 1b. The Articulated rod 4 is on the tappet 22 by means of a Pivot bearing 13 attached to the bottom 23 of the tappet 22 is arranged.

Zusätzlich zur Ventilfeder 19 ist bei diesem Ausführungsbeispiel noch eine zweite Spiralfeder 24 vorgesehen, die die Ventilfeder 19 konzentrisch umschließt. Diese zweite Spiralfeder 24 ist mit ihrem einen Ende - wie die Ventilfeder 19 - an der Ventilführung 18 ortsfest gelagert und liegt mit ihrem anderen Ende an der dem Ventil 7 zugewandten Seite des Bodens 23 des Tassenstößels 22 an. Durch diese zweite Spiralfeder 24 wird der Tassenstößel 22 und mit ihm die Gelenkstange 4 und das Rollenpaket 2 zu den Nockenwellen 1a, 1b hingedrückt, wodurch das Rollenpaket 2 immer an beiden Nokkenwellen 1a, 1b anliegt.In addition to the valve spring 19 is in this embodiment a second coil spring 24 is provided, which Valve spring 19 encloses concentrically. This second coil spring 24 is at one end - like the valve spring 19 - mounted on the valve guide 18 stationary and lies with her the other end on the side of the valve 7 facing the Bottom 23 of the tappet 22 on. Through this second coil spring 24 becomes the tappet 22 and with it the joint rod 4 and the roller set 2 to the camshafts 1a, 1b pressed, whereby the roller set 2 always on both camshafts 1a, 1b is present.

In den Figuren 3 und 4 ist ein weiteres Ausführungsbeispiel mit einem Tassenstößel 25 als Betätigungseinrichtung dargestellt. Die offene Seite des Tassenstößels 25 ist hierbei dem Ventil 7 zugewandt. Das Drehlager 13 zum Anschluß der Gelenkstange 4 ist an der den Nockenwellen la, 1b zugewandten Seite des Bodens 23 des Tassenstößels 25 angebracht.Another exemplary embodiment is shown in FIGS shown with a tappet 25 as an actuator. The open side of the tappet 25 is here facing the valve 7. The pivot bearing 13 for connecting the Articulated rod 4 is on the camshafts la, 1b facing Side of the bottom 23 of the tappet 25 attached.

Mittels einer (nur in Fig. 3 dargestellten) Biegefeder 26 wird das Rollenpaket 2 an eine der Nockenwellen la angedrückt. Die Biegefeder 26 ist V-förmig ausgebildet, wobei sie um das Drehlager 13 herumgeführt ist und mit der Außenseite eines Schenkels 27 am Rollenpaket 2 und mit der Außenseite des anderen Schenkels 28 am Boden 23 des Tassenstößels 25 anliegt.By means of a spiral spring 26 (only shown in FIG. 3) the roller set 2 is pressed onto one of the camshafts la. The spiral spring 26 is V-shaped, wherein it is guided around the pivot bearing 13 and with the outside a leg 27 on the roll package 2 and with the outside of the other leg 28 on the bottom 23 of the tappet 25 is present.

Claims (9)

Vorrichtung zur variablen Steuerung eines Ventils einer Brennkraftmaschine, mit zwei Nockenwellen zum Öffnen und Schließen des Ventils, deren Phasenlage zueinander zur Veränderung von Hub und/oder Öffnungsdauer des Ventils veränderbar ist, einer Abtasteinrichtung zum gleichzeitigen Abtasten der Nockenkonturen beider Nockenwellen und mit einer Betätigungseinrichtung zum Übertragen der Bewegung der Abtasteinrichtung auf das Ventil, wobei das Ventil durch eine Ventilfeder in Schließstellung vorgespannt ist, dadurch gekennzeichnet,
daß die Abtasteinrichtung (2) am Ende einer Gelenkstange (4) drehbar befestigt ist, deren anderes Ende an der Betätigungseinrichtung (3, 22, 25) drehbar befestigt ist.
Device for the variable control of a valve of an internal combustion engine, with two camshafts for opening and closing the valve, the phase relationship of which can be changed relative to one another in order to change the stroke and / or opening duration of the valve, a scanning device for simultaneous scanning of the cam contours of both camshafts and with an actuating device for transmitting the movement of the scanning device to the valve, the valve being biased in the closed position by a valve spring, characterized,
that the scanning device (2) is rotatably attached to the end of an articulated rod (4), the other end of which is rotatably attached to the actuating device (3, 22, 25).
Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Abtasteinrichtung (2) durch auf einer gemeinsamen Achse (9) angeordnete Rollen (2a, 2b, 2c) gebildet ist.Device according to claim 1, characterized in that the scanning device (2) by on a common Axle (9) arranged rollers (2a, 2b, 2c) is formed. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abtasteinrichtung (2) durch eine Federeinrichtung (16, 24, 26) in Anlage an mindestens einer Nokkenwelle (la) gehalten ist.Device according to claim 1 or 2, characterized in that that the scanning device (2) by a spring device (16, 24, 26) in contact with at least one camshaft (la) is kept. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Betätigungselement als Schlepphebel (3) ausgebildet ist und die Gelenkstange (4) zwischen der Auflage (14) des Schlepphebels (3) auf dem Ventil (7) und der ortsfesten Lagerung (15) des Schlepphebels (3) an diesem drehbar befestigt ist.Device according to one of claims 1 to 3, characterized in that that the actuator as a rocker arm (3) is formed and the articulated rod (4) between the Pad (14) of the rocker arm (3) on the valve (7) and the fixed mounting (15) of the rocker arm (3) this is rotatably attached. Vorrichtung nach Anspruch 3 und 4, dadurch gekennzeichnet, daß die Abtasteinrichtung (2) durch eine im wesentlichen in Längsrichtung des Schlepphebels (3) wirkende Federkraft (16) in Anlage an mindestens einer Nockenwelle (la) gehalten ist.Device according to claim 3 and 4, characterized in that that the scanner (2) by a substantially acting in the longitudinal direction of the rocker arm (3) Spring force (16) in contact with at least one camshaft (la) is kept. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Betätigungselement als Tassenstößel (22, 25) ausgebildet ist und die Gelenkstange (4) in Verlängerung der Mittenachse des Ventils (7) am Tassenstößel (22, 25) angreift.Device according to one of claims 1 to 3, characterized in that that the actuator as a tappet (22, 25) is formed and the articulated rod (4) in extension the center axis of the valve (7) on the bucket tappet (22, 25) attacks. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Federeinrichtung eine die Ventilfeder (19) umgebende Spiralfeder (24) aufweist, deren eines Ende zum Ventil (7) ortsfest gehalten ist, deren anderes Ende am Tassenstößel (22, 25) anliegt und die die Abtasteinrichtung (2) in Anlage an beiden Nockenwellen (1a, 1b) hält.Apparatus according to claim 6, characterized in that the spring device surrounds the valve spring (19) Has coil spring (24), one end of the valve (7) is held stationary, the other end of the tappet (22, 25) and the scanning device (2) stops in contact with both camshafts (1a, 1b). Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die drehbaren Befestigungen der Abtast- und der Betätigungseinrichtung (2; 3, 22, 25) an der Gelenkstange (4) als Gleitlager ausgebildet sind.Device according to one of claims 1 to 7, characterized in that that the rotatable fastenings of the scanning and the actuating device (2; 3, 22, 25) on the articulated rod (4) are designed as plain bearings. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die drehbaren Befestigungen der Abtast- und der Betätigungseinrichtung (2; 3, 22, 25) an der Gelenkstange (4) als Nadellager ausgebildet sind.Device according to one of claims 1 to 7, characterized in that that the rotatable fastenings of the scanning and the actuating device (2; 3, 22, 25) on the articulated rod (4) are designed as needle bearings.
EP19990100855 1999-01-19 1999-01-19 Variable valve drive for internal combustion engine Expired - Lifetime EP1022443B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59900189T DE59900189D1 (en) 1999-01-19 1999-01-19 Device for the variable control of a valve of an internal combustion engine
EP19990100855 EP1022443B1 (en) 1999-01-19 1999-01-19 Variable valve drive for internal combustion engine

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EP19990100855 EP1022443B1 (en) 1999-01-19 1999-01-19 Variable valve drive for internal combustion engine

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10235403A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
EP1426569A1 (en) * 2002-11-23 2004-06-09 Mechadyne plc Engine with variable valve mechanism
EP1847691A2 (en) * 2006-04-21 2007-10-24 Schaeffler KG Roller element for a pivotable machine part
US7299774B2 (en) 2003-01-30 2007-11-27 Mahle Ventiltrieb Gmbh Valve control
DE102009041963A1 (en) * 2009-09-17 2011-04-21 Mahle International Gmbh Adjusting device and coupling device
WO2015020678A1 (en) * 2013-08-09 2015-02-12 Diggs Matthew B Helical torsion valve spring assembly
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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US5052350A (en) * 1990-11-02 1991-10-01 King Brian T Device to combine the motions of two camlobes differentially phased
EP0659232A1 (en) 1993-07-06 1995-06-28 Meta Motoren Energietech Variable control process and device for an internal combustion engine valve.
DE19600536A1 (en) * 1996-01-09 1997-07-10 Meta Motoren Energietech Device for variable control of inlet valve of combustion engine
DE19701201A1 (en) * 1997-01-15 1998-07-23 Daimler Benz Ag Variable valve control for internal combustion engine of motor vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052350A (en) * 1990-11-02 1991-10-01 King Brian T Device to combine the motions of two camlobes differentially phased
EP0659232A1 (en) 1993-07-06 1995-06-28 Meta Motoren Energietech Variable control process and device for an internal combustion engine valve.
DE19600536A1 (en) * 1996-01-09 1997-07-10 Meta Motoren Energietech Device for variable control of inlet valve of combustion engine
DE19701201A1 (en) * 1997-01-15 1998-07-23 Daimler Benz Ag Variable valve control for internal combustion engine of motor vehicle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10235403A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
EP1426569A1 (en) * 2002-11-23 2004-06-09 Mechadyne plc Engine with variable valve mechanism
US7299774B2 (en) 2003-01-30 2007-11-27 Mahle Ventiltrieb Gmbh Valve control
EP1847691A2 (en) * 2006-04-21 2007-10-24 Schaeffler KG Roller element for a pivotable machine part
DE102006018512A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Roller element for a pivotable machine part
EP1847691A3 (en) * 2006-04-21 2009-04-08 Schaeffler KG Roller element for a pivotable machine part
DE102009041963A1 (en) * 2009-09-17 2011-04-21 Mahle International Gmbh Adjusting device and coupling device
WO2015020678A1 (en) * 2013-08-09 2015-02-12 Diggs Matthew B Helical torsion valve spring assembly
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

Also Published As

Publication number Publication date
EP1022443B1 (en) 2001-08-08
DE59900189D1 (en) 2001-09-13

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