EP2568132B1 - Double leg spring for a variable stroke valve drive in a cylinder head of a combustion engine - Google Patents

Double leg spring for a variable stroke valve drive in a cylinder head of a combustion engine Download PDF

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Publication number
EP2568132B1
EP2568132B1 EP12179335.0A EP12179335A EP2568132B1 EP 2568132 B1 EP2568132 B1 EP 2568132B1 EP 12179335 A EP12179335 A EP 12179335A EP 2568132 B1 EP2568132 B1 EP 2568132B1
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EP
European Patent Office
Prior art keywords
spring
leg
leg spring
cylinder head
valve drive
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EP12179335.0A
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German (de)
French (fr)
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EP2568132A1 (en
Inventor
Johannes Meyer
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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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
    • 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
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type

Definitions

  • the invention relates to a Döppelschenkelfeder for a variable-stroke valve drive in a cylinder head of an internal combustion engine with the features of the preamble of claim 1.
  • a generic double leg spring for a variable stroke valve train in a cylinder head of an internal combustion engine is for example from the German patent application DE 101 22 152 A1 known.
  • an assembly aid for a double leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine is described, wherein the double leg spring from at least a first and a second leg spring, which are arranged substantially coaxially to a common spring axis, and the first leg spring a first Spring leg and the second leg spring having a second spring leg, wherein the winding directions of the first and the second leg spring opposite and the first and second leg spring in the region of the reversal of the winding direction together form a common intermediate leg, which is connectable to a portion of the cylinder head, wherein the mounting aid the first and the second spring leg releasably connected to the intermediate leg in a biased operative position.
  • the mounting aid is a safe and easy installation of the double leg spring in a variable-stroke valve drive in a cylinder head of an internal
  • a variable-stroke valve train with a double leg spring in a cylinder head of an internal combustion engine is known.
  • the valve drive comprises a pivot lever which is supported on the one hand with a roller element with a swing fulcrum on a slide track of a link and on the other hand with a control track on an intermediate element to a gas exchange valve clearance, the pivot lever for stroke adjustment between the support points on the one hand by a cam of a camshaft opposite controlled a force of the double leg spring pivotally and on the other hand, the swing fulcrum of an adjusting device for height adjustment parallel to the slide track is slidably controlled.
  • the double leg spring forms in its middle region an intermediate leg with which the double leg spring is mountable.
  • the double leg spring In order to ensure the required positional accuracy of the leg ends of the double leg spring in the cylinder head, the double leg spring must be positioned with an auxiliary device during assembly and subsequent screwing.
  • the centering of the torsion spring on the game, as well as the position tolerance of the mounting thread in the cylinder head increases the overall tolerance of the leg ends.
  • An angle error of the retaining plate on the thigh lowered the position accuracy of the leg ends in addition.
  • the production of the fastening thread and the screwing represent a high manufacturing and assembly costs. The provision of the fastening screw increases the manufacturing cost.
  • the object of the present invention is o. G. To avoid disadvantages.
  • the embodiment according to claim 2 is a particularly preferred embodiment.
  • the angular range according to claim 3 has been found to be particularly suitable.
  • Fig. 1 shows a plan view of a three-dimensionally illustrated generic double leg spring 1 for a variable-stroke valve train in a cylinder head of an internal combustion engine.
  • the double leg spring 1 has two spring legs 1a, 1b, between which an intermediate leg 11 is arranged. At the intermediate leg 11, the direction of rotation of the spring legs 1 a, 1 b changes.
  • Each spring leg 1a, 1b is in each case associated with a cylinder gas valve of the same effect.
  • the intermediate leg 11 is further comprised of a mounting plate 15, with an unnumbered mounting hole.
  • the two spring legs 1a, 1b and the intermediate leg 11 are connected to each other with a mounting bracket 14 in a biased position.
  • Fig. 2 shows a side view of a generic variable stroke valve train 2 in a cylinder head 3 of an internal combustion engine, as he from the prior art, the DE 10 2006 033 559 A1 is known.
  • the known double leg spring 1 is provided for the variable-stroke valve drive 2 in the cylinder head 3 of an internal combustion engine, not shown.
  • the valve drive 2 comprises a pivoting lever, which is on the one hand with a roller element 5 with a swing fulcrum 5 'on a slide track 6' a link 6 and on the other hand supported with a control track 4 'on an intermediate element 7 to a gas exchange valve 8 without play.
  • the double leg spring 1 forms in its central region the intermediate leg 11, with a reversal of rotation of the two spring legs 1a, 1b, wherein the intermediate leg 11 is enveloped by the mounting plate 15.
  • a mounting means 16 in the present embodiment a screw, the double leg spring 1 can be fastened either on the cylinder head 3 or on a shaft bearing.
  • Fig. 3 shows a plan view of a double leg spring 1 according to the invention, in installation position, arranged on a shaft bearing 17.
  • the intermediate leg 11 is V-shaped and can be inserted when mounted in a corresponding V-groove 12.
  • the intermediate leg 11 is additionally comprised of a V-shaped plate 13.
  • the V-groove 12 is disposed in a shaft bearing, in another embodiment, it can also in a Machine housing 17, such as directly in a cylinder head, be arranged.
  • the V-angle ⁇ of the intermediate leg 11 and the V-groove 12 about 45 °, in other embodiments, this V-angle ⁇ between 20 ° and 120 °.
  • the double leg spring 1 according to the invention is preferably mounted with the plate 13 by simply plugging it into the V-shaped groove in the cylinder head or in a shaft bearing 17. Due to the V-shaped receptacle in the cylinder head or in the shaft bearing 17 a significantly reduced tolerance lateral centering of the double leg spring 1 is possible, since the aforementioned games (fixing screw / mounting hole) omitted in the positioning of the double-leg spring system. The assembly effort is significantly reduced by the elimination of the provision of the screw (fastener) and the screwing.

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

Description

Die Erfindung betrifft eine Döppelschenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine mit den Merkmalen aus dem Oberbegriff des Patentanspruchs 1.The invention relates to a Döppelschenkelfeder for a variable-stroke valve drive in a cylinder head of an internal combustion engine with the features of the preamble of claim 1.

Eine gattungsgemäße Doppelschenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine ist beispielsweise aus der deutschen Offenlegungsschrift DE 101 22 152 A1 bekannt. In dieser Offenlegungsschrift ist eine Montagehilfe für eine Doppelschenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine beschrieben, wobei die Doppelschenkelfeder aus zumindest einer ersten und einer zweiten Schenkelfeder, die weitgehend koaxial zu einer gemeinsamen Federachse angeordnet sind, dargestellt ist und die erste Schenkelfeder einen ersten Federschenkel und die zweite Schenkelfeder einen zweiten Federschenkel aufweisen, wobei die Wicklungsrichtungen der ersten und der zweiten Schenkelfeder entgegengesetzt und die erste und zweite Schenkelfeder im Bereich der Umkehr der Wicklungsrichtung miteinander einen gemeinsamen Zwischenschenkel bilden, der mit einem Abschnitt des Zylinderkopfes verbindbar ist, wobei die Montagehilfe den ersten und den zweiten Federschenkel mit dem Zwischenschenkel in einer vorgespannten Wirkposition lösbar miteinander verbindet. Durch die Montagehilfe ist eine gefahrlose und problemlose Montage der Doppelschenkelfeder in einem hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine möglich.A generic double leg spring for a variable stroke valve train in a cylinder head of an internal combustion engine is for example from the German patent application DE 101 22 152 A1 known. In this publication, an assembly aid for a double leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine is described, wherein the double leg spring from at least a first and a second leg spring, which are arranged substantially coaxially to a common spring axis, and the first leg spring a first Spring leg and the second leg spring having a second spring leg, wherein the winding directions of the first and the second leg spring opposite and the first and second leg spring in the region of the reversal of the winding direction together form a common intermediate leg, which is connectable to a portion of the cylinder head, wherein the mounting aid the first and the second spring leg releasably connected to the intermediate leg in a biased operative position. The mounting aid is a safe and easy installation of the double leg spring in a variable-stroke valve drive in a cylinder head of an internal combustion engine possible.

Aus der DE 10 2006 033 559 A1 ist ein hubvariabler Ventiltrieb für eine Brennkraftmaschine bekannt. Der hubvariable Ventiltrieb für eine Brennkraftmaschine weist zumindest einen ersten und einen zweiten Zylinder und gleichwirkende Gaswechselventile auf, wobei ' jedem Zylinder eine Gaswechselventilbetätigungseinheit zugeordnet ist. Diese Gaswechselventilbetätigungseinheit besteht aus zumindest:

  • Einem Zwischenhebel, der einerseits schiebebeweglich auf einer Kulissenbahn einer Kulisse gelagert ist und andererseits eine Arbeitskurve aufweist,
  • wobei
  • die Arbeitskurve über ein Zwischenelement mit einem Gaswechselventil in Wirkverbindung steht, wobei
  • eine erste Stellvorrichtung zum Drehen des Zwischenhebels um einen kulissennahen Punkt gegen eine Federkraft eines Federelementes vorgesehen ist, wobei
  • Der Zwischenhebel mit einer zweiten Stellvorrichtung entlang der Kulissenbahn verschiebbar ist, wobei
  • die zweite Stellvorrichtung einen ersten Einstellpunkt für einen Nullhub, zumindest einen zweiten Einstellpunkt für einen Teilhub und einen dritten Einstellpunkt für einen Vollhub des Gaswechselventils aufweist und wobei dem Gaswechselventil des ersten Zylinders eine erste zweite Stellvorrichtung und dem Gaswechselventil des zweiten Zylinders eine zweite zweite Stellvorrichtung zugeordnet ist.
From the DE 10 2006 033 559 A1 is a variable-stroke valve drive for an internal combustion engine known. The stroke-variable valve train for an internal combustion engine has at least one first and one second cylinder and gas exchange valves having the same effect, with each cylinder being assigned a gas exchange valve actuation unit. This gas exchange valve operating unit consists of at least:
  • An intermediate lever which is mounted on the one hand sliding on a slide track of a backdrop and on the other hand has a working curve,
  • in which
  • the working curve via an intermediate element is in operative connection with a gas exchange valve, wherein
  • a first adjusting device is provided for rotating the intermediate lever about a near-point point against a spring force of a spring element, wherein
  • The intermediate lever with a second adjusting device along the slide track is displaceable, wherein
  • the second adjusting device has a first setpoint for a zero lift, at least a second setpoint for a partial lift and a third setpoint for a full lift of the gas exchange valve and wherein the gas exchange valve of the first cylinder, a first second actuator and the gas exchange valve of the second cylinder is associated with a second second actuator ,

Aus der EP 1 854 967 A2 , von der diese Erfindung ausgeht, ist ein hubvariabler Ventiltrieb mit einer Doppelschenkelfeder in einem Zylinderkopf einer Brennkraftmaschine bekannt. Der Ventiltrieb umfasst einen Schwenkhebel auf, der einerseits mit einem Rollenelement mit einem Schwingdrehpunkt auf einer Kulissenbahn einer Kulisse und andererseits mit einer Steuerbahn auf einem Zwischenelement zu einem Gaswechselventil spielfrei abgestützt ist, wobei der Schwenkhebel zur Hubeinstellung zwischen den Abstützpunkten einerseits von einem Nocken einer Nockenwelle entgegen einer Kraft der Doppelschenkelfeder gesteuert schwenkbar und andererseits der Schwingdrehpunkt von einer Verstelleinrichtung zur Hubhöhenverstellung parallel zur Kulissenbahn gesteuert verschiebbar ist. Weiter bildet die Doppelschenkelfeder in ihrem Mittenbereich einen Zwischenschenkel mit dem die Doppelschenkelfeder montierbar ist.From the EP 1 854 967 A2 , from which this invention proceeds, a variable-stroke valve train with a double leg spring in a cylinder head of an internal combustion engine is known. The valve drive comprises a pivot lever which is supported on the one hand with a roller element with a swing fulcrum on a slide track of a link and on the other hand with a control track on an intermediate element to a gas exchange valve clearance, the pivot lever for stroke adjustment between the support points on the one hand by a cam of a camshaft opposite controlled a force of the double leg spring pivotally and on the other hand, the swing fulcrum of an adjusting device for height adjustment parallel to the slide track is slidably controlled. Next, the double leg spring forms in its middle region an intermediate leg with which the double leg spring is mountable.

Um die geforderte Positionsgenauigkeit der Schenkelenden der Doppelschenkelfeder im Zylinderkopf zu gewährleisten, muss die Doppelschenkelfeder bei der Montage und der nachfolgenden Verschraubung mit einer Hilfsvorrichtung positioniert werden. Die Zentrierung der Drehfeder über das Spiel, sowie die Positionstoleranz des Befestigungsgewindes im Zylinderkopf erhöht die Gesamttoleranz der Schenkelenden. Ein Winkelfehler des Halte-blechs am Zwischenschenkel erniedrigt die Positionsgenauigkeit der Schenkelenden zusätzlich. Die Fertigung des Befestigungsgewindes sowie der Schraubvorgang stellen einen hohen Fertigungs- und Montageaufwand dar. Die Bereitstellung der Befestigungsschraube erhöht die Herstellkosten.In order to ensure the required positional accuracy of the leg ends of the double leg spring in the cylinder head, the double leg spring must be positioned with an auxiliary device during assembly and subsequent screwing. The centering of the torsion spring on the game, as well as the position tolerance of the mounting thread in the cylinder head increases the overall tolerance of the leg ends. An angle error of the retaining plate on the thigh lowered the position accuracy of the leg ends in addition. The production of the fastening thread and the screwing represent a high manufacturing and assembly costs. The provision of the fastening screw increases the manufacturing cost.

Aufgabe der vorliegenden Erfindung ist es, o. g. Nachteile zu vermeiden.The object of the present invention is o. G. To avoid disadvantages.

Diese Aufgabe wird durch die Merkmale im kennzeichnenden Teil des Patentanspruchs 1 gelöst.
Erfindungsgemäß wird die Doppelschenkelfeder durch einfaches Stecken in die Aufnahme, einer V-förmigen Nut im Zylinderkopf, montiert. Durch die V-förmige Aufnahme im Zylinderkopf wird eine deutlich toleranzreduzierte seitliche Zentrierung der Doppelschenkelfeder ermöglicht, da die o. g. Spiele (Schraube, Gewinde, Befestigungsloch) bei der Positionierung des Doppelschenkelfedersystems entfallen. Der Montageaufwand wird durch den Entfall der Bereitstellung der Befestigungsschraube sowie des Schraubvorgangs deutlich reduziert.This object is solved by the features in the characterizing part of patent claim 1.
According to the double leg spring is mounted by simply plugging into the receptacle, a V-shaped groove in the cylinder head. Due to the V-shaped receptacle in the cylinder head a significantly reduced tolerance lateral centering of the double leg spring is possible because the above-mentioned games (screw, thread, mounting hole) omitted in the positioning of the double-leg spring system. The assembly effort is significantly reduced by the elimination of the provision of the fastening screw and the screwing.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous developments of the invention are described in the subclaims.

Die Ausgestaltung gemäß Patentanspruch 2 ist eine besonders bevorzugte Ausführungsvariante.The embodiment according to claim 2 is a particularly preferred embodiment.

Der Winkelbereich gemäß Patentanspruch 3 hat sich als besonders geeignet herausgestellt.The angular range according to claim 3 has been found to be particularly suitable.

Im Folgenden wird die Erfindung in zwei Figuren anhand des Standes der Technik und in einer dritten Figur anhand einer erfindungsgemäßen Ausgestaltung näher erläutert.

Fig. 1
zeigt eine Aufsicht auf eine gattungsgemäße Doppelschenkelfeder gemäß dem Stand der Technik.
Fig. 2
zeigt eine Seitenansicht eines gattungsgemäßen hubvariablen Ventiltriebs gemäß dem Stand der Technik
Fig. 3
zeigt eine Aufsicht auf eine erfindungsgemäße Doppelschenkelfeder.
In the following, the invention is explained in more detail in two figures with reference to the prior art and in a third figure with reference to an inventive embodiment.
Fig. 1
shows a plan view of a generic double leg spring according to the prior art.
Fig. 2
shows a side view of a generic variable stroke valve train according to the prior art
Fig. 3
shows a plan view of a double leg spring according to the invention.

Im Folgenden gelten in den Fig. 1 bis 3 für gleiche Bauelemente die gleichen Bezugsziffern.The following apply in the Fig. 1 to 3 for same components the same reference numbers.

Fig. 1 zeigt eine Aufsicht auf eine dreidimensional dargestellte gattungsgemäße Doppelschenkelfeder 1 für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine. Die Doppelschenkelfeder 1 weist zwei Federschenkel 1a, 1 b auf, zwischen denen ein Zwischenschenkel 11 angeordnet ist. Am Zwischenschenkel 11 ändert sich die Drehrichtung der Federschenkel 1 a, 1 b. Jeder Federschenkel 1a, 1 b ist jeweils einem gleichwirkenden Gaswechselventil eines Zylinders zugeordnet. Der Zwischenschenkel 11 ist ferner von einem Montageblech 15 umfasst, mit einer nicht bezifferten Montagebohrung. Um eine gefahrlose und problemlose Montage der Doppelschenkelfeder in einem hubvariablen Ventiltrieb in einem Zylinderkopf der Brennkraftmaschine zu ermöglichen, sind die zwei Federschenkel 1a, 1b und der Zwischenschenkel 11 mit einer Montagehalterung 14 in vorgespannter Position miteinander verbunden. Fig. 1 shows a plan view of a three-dimensionally illustrated generic double leg spring 1 for a variable-stroke valve train in a cylinder head of an internal combustion engine. The double leg spring 1 has two spring legs 1a, 1b, between which an intermediate leg 11 is arranged. At the intermediate leg 11, the direction of rotation of the spring legs 1 a, 1 b changes. Each spring leg 1a, 1b is in each case associated with a cylinder gas valve of the same effect. The intermediate leg 11 is further comprised of a mounting plate 15, with an unnumbered mounting hole. In order to enable a safe and easy installation of the double leg spring in a variable-stroke valve drive in a cylinder head of the internal combustion engine, the two spring legs 1a, 1b and the intermediate leg 11 are connected to each other with a mounting bracket 14 in a biased position.

Fig. 2 zeigt eine Seitenansicht auf einen gattungsgemäßen hubvariablen Ventiltrieb 2 in einem Zylinderkopf 3 einer Brennkraftmaschine, wie er aus dem Stand der Technik, der DE 10 2006 033 559 A1 bekannt ist. Die bekannte Doppelschenkelfeder 1 ist für den hubvariablen Ventiltrieb 2 in dem Zylinderkopf 3 einer nicht dargestellten Brennkraftmaschine vorgesehen. Der Ventiltrieb 2 umfasst einen Schwenkhebel, der einerseits mit einem Rollenelement 5 mit einem Schwingdrehpunkt 5' auf einer Kulissenbahn 6' einer Kulisse 6 und andererseits mit einer Steuerbahn 4' auf einem Zwischenelement 7 zu einem Gaswechselventil 8 spielfrei abgestützt ist. Zur Hubeinstellung ist der Schwenkhebel 4 zwischen den Abstützpunkten einerseits von einem Nocken 9' einer Nockenwelle 9 entgegen einer Kraft der Doppelschenkelfeder 1 gesteuert schwenkbar und andererseits der Schwingdrehpunkt 5' von einer Verstelleinrichtung 10 zur Hubhöhenverstellung parallel zur Kulissenbahn 6' gesteuert verschiebbar. Weiter bildet die Doppelschenkelfeder 1 in ihrem Mittenbereich den Zwischenschenkel 11, mit einer Drehrichtungsumkehr der zwei Federschenkel 1a, 1b, wobei der Zwischenschenkel 11 von dem Montageblech 15 umhüllt ist. Mit einem Montagemittel 16, im vorliegenden Ausführungsbeispiel eine Schraube, ist die Doppelschenkelfeder 1 entweder am Zylinderkopf 3 oder an einem Wellenlager befestigbar. Zur Funktionsweise des hubvariablen Ventiltriebs 2 wird auch auf die internationale Patentanmeldung WO 02/092972 A1 hingewiesen. Fig. 2 shows a side view of a generic variable stroke valve train 2 in a cylinder head 3 of an internal combustion engine, as he from the prior art, the DE 10 2006 033 559 A1 is known. The known double leg spring 1 is provided for the variable-stroke valve drive 2 in the cylinder head 3 of an internal combustion engine, not shown. The valve drive 2 comprises a pivoting lever, which is on the one hand with a roller element 5 with a swing fulcrum 5 'on a slide track 6' a link 6 and on the other hand supported with a control track 4 'on an intermediate element 7 to a gas exchange valve 8 without play. To adjust the stroke of the pivot lever 4 is controlled between the support points on the one hand by a cam 9 'of a camshaft 9 counter to a force of the double leg spring 1 pivotally and on the other hand, the oscillating pivot 5' of an adjustment 10 for Hubhöhenverstellung parallel to the slide track 6 'controlled slidably. Next, the double leg spring 1 forms in its central region the intermediate leg 11, with a reversal of rotation of the two spring legs 1a, 1b, wherein the intermediate leg 11 is enveloped by the mounting plate 15. With a mounting means 16, in the present embodiment a screw, the double leg spring 1 can be fastened either on the cylinder head 3 or on a shaft bearing. For the operation of the variable stroke valve train 2 is also on the international patent application WO 02/092972 A1 pointed.

Fig. 3 zeigt eine Aufsicht auf eine erfindungsgemäße Doppelschenkelfeder 1, in Einbaulage, an einem Wellenlager 17 angeordnet. Erfindungsgemäß ist im Gegensatz zum zitierten Stand der Technik der Zwischenschenkel 11 V-förmig ausgebildet und bei einer Montage in eine korrespondierende V-Nut 12 einsteckbar. Fig. 3 shows a plan view of a double leg spring 1 according to the invention, in installation position, arranged on a shaft bearing 17. According to the invention, in contrast to the cited prior art, the intermediate leg 11 is V-shaped and can be inserted when mounted in a corresponding V-groove 12.

Im dargestellten Ausführungsbeispiel ist der Zwischenschenkel 11 zusätzlich von einem V-förmigen Blech 13 umfasst.In the illustrated embodiment, the intermediate leg 11 is additionally comprised of a V-shaped plate 13.

Im vorliegenden Ausführungsbeispiel ist die V-Nut 12 in einem Wellenlager angeordnet, in einem anderen Ausführungsbeispiel kann sie auch in einem Maschinengehäuse 17, wie beispielsweise direkt in einem Zylinderkopf, angeordnet sein.In the present embodiment, the V-groove 12 is disposed in a shaft bearing, in another embodiment, it can also in a Machine housing 17, such as directly in a cylinder head, be arranged.

Im vorliegenden Ausführungsbeispiel weist der V-Winkel α des Zwischenschenkels 11 und der V-Nut 12 ca. 45° auf, im weiteren Ausführungsbeispielen kann dieser V-Winkel α zwischen 20° und 120° betragen.In the present embodiment, the V-angle α of the intermediate leg 11 and the V-groove 12 about 45 °, in other embodiments, this V-angle α between 20 ° and 120 °.

Die erfindungsgemäße Doppelschenkelfeder 1 wird bevorzugt mit dem Blech 13 durch einfaches Stecken in die V-förmige Nut im Zylinderkopf oder in einem Wellenlager 17 montiert. Durch die V-förmige Aufnahme im Zylinderkopf oder im Wellenlager 17 wird eine deutlich toleranzreduzierte seitliche Zentrierung der Doppelschenkelfeder 1 ermöglicht, da die eingangs genannten Spiele (Befestigungsschraube/Befestigungsloch) bei der Positionierung des Doppelschenkelfedersystems entfallen. Der Montageaufwand wird durch den Entfall der Bereitstellung der Schraube (Befestigungsmittel) sowie des Schraubvorgangs deutlich reduziert.The double leg spring 1 according to the invention is preferably mounted with the plate 13 by simply plugging it into the V-shaped groove in the cylinder head or in a shaft bearing 17. Due to the V-shaped receptacle in the cylinder head or in the shaft bearing 17 a significantly reduced tolerance lateral centering of the double leg spring 1 is possible, since the aforementioned games (fixing screw / mounting hole) omitted in the positioning of the double-leg spring system. The assembly effort is significantly reduced by the elimination of the provision of the screw (fastener) and the screwing.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

1.1.
DoppelschenkelfederDouble leg spring
1a1a
Federschenkelspring leg
1b1b
Federschenkelspring leg
2.Second
Ventiltriebvalve train
3.Third
Zylinderkopfcylinder head
4.4th
Schwenkhebelpivoting lever
4'4 '
Steuerbahncontrol track
5.5th
Rollenelementroller element
5'5 '
SchwingdrehpunktSwing fulcrum
6.6th
Kulissescenery
6'6 '
Kulissenbahnlink path
7.7th
Zwischenelementintermediate element
8.8th.
GaswechselventilGas exchange valve
9.9th
Nockenwellecamshaft
9'9 '
Nockecam
10.10th
Verstelleinrichtungadjustment
11.11th
Zwischenschenkelintermediate leg
12.12th
V-NutV-groove
13.13th
Blechsheet
14.14th
Montagehalterungmounting bracket
15.15th
Montageblechmounting plate
16.16th
Montagemittelmounting means
17.17th
Wellenlagershaft bearing

Claims (3)

  1. A variable-stroke valve drive (2) with a double leg spring (1) in a cylinder head (3) of an internal combustion engine, wherein the valve drive (2) comprises a pivoted lever (4) held without clearance on one side by a roller element (5) having an oscillating centre of rotation (5') on a running surface (6') of a connecting link (6), the other side being held without clearance by a control path (4') on an intermediate element (7) on the way to a gas change valve (8), wherein the pivoted lever (4), in order to adjust the stroke between the holding points, is on the one hand pivotable in controlled manner by a cam (9') on a camshaft (9) against the force of the double leg spring (1) and on the other hand the oscillating centre of rotation (5') is movable in controlled manner by an adjusting device (10) in order to adjust the height of stroke parallel to the running surface (6'), wherein the double leg spring (1) in its central region forms an intermediate leg spring (11) with a reversal of the direction of rotation of the two spring legs (1a, 1b) and wherein the double leg spring (1) can be mounted in the neighbourhood of the intermediate leg (11) and wherein the intermediate leg (11) is V-shaped, characterised in that the intermediate leg (11) when fitted is inserted into a corresponding V-shaped recess (12) in the cylinder head (3) or in a shaft bearing (17).
  2. A variable-stroke valve drive according to claim 1,
    characterised in that the intermediate leg (11) is surrounded by a V-shaped metal sheet (13).
  3. A variable-stroke valve drive according to claim 1 or claim 2,
    characterised in that a V-angle of the intermediate leg (11) and of the V-shaped recess (12) is between 20 and 120 .
EP12179335.0A 2011-09-07 2012-08-06 Double leg spring for a variable stroke valve drive in a cylinder head of a combustion engine Active EP2568132B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011082226A DE102011082226A1 (en) 2011-09-07 2011-09-07 Double leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2568132A1 EP2568132A1 (en) 2013-03-13
EP2568132B1 true EP2568132B1 (en) 2014-07-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12179335.0A Active EP2568132B1 (en) 2011-09-07 2012-08-06 Double leg spring for a variable stroke valve drive in a cylinder head of a combustion engine

Country Status (2)

Country Link
EP (1) EP2568132B1 (en)
DE (1) DE102011082226A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020101555A1 (en) 2020-01-23 2021-07-29 Bayerische Motoren Werke Aktiengesellschaft Stroke variable valve train with a double leg spring

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016220397A1 (en) * 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train
FR3063016B1 (en) 2017-02-21 2021-06-18 Dit Sydenham Quentin Boeking LIFT AND HOLD DEVICE ALONG A VERTICAL CABLE
CN109519245A (en) * 2018-10-11 2019-03-26 杭州新坐标科技股份有限公司 A kind of new engine swing rod

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Publication number Priority date Publication date Assignee Title
DE19509604A1 (en) * 1995-03-16 1996-09-19 Bayerische Motoren Werke Ag Valve train of an internal combustion engine
DE10122152B4 (en) 2001-05-08 2005-07-21 Bayerische Motoren Werke Ag Assembly aid and a method for assembly and disassembly for a leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine
DE10123186A1 (en) 2001-05-12 2002-11-14 Bayerische Motoren Werke Ag Valve gear device for variable lift adjustment is for gas exchange valve of internal combustion engine and has valve vai intermediary of transmission component effectively connected to roller movable around rotary axis
JP4278590B2 (en) * 2004-08-31 2009-06-17 株式会社日立製作所 Variable valve operating device for internal combustion engine
US7305946B2 (en) * 2004-11-30 2007-12-11 Hitachi, Ltd. Variable valve operating apparatus for internal combustion engine
JP2007127117A (en) * 2005-10-04 2007-05-24 Masaaki Yoshikawa Valve system apparatus for four-stroke internal combustion engine
DE102006022481A1 (en) * 2006-05-13 2007-11-15 Bayerische Motoren Werke Ag Cylinder head for an internal combustion engine with a variable-stroke valve drive
DE102006033559A1 (en) 2006-07-20 2008-01-24 Bayerische Motoren Werke Ag Valve drive unit for an internal combustion engine comprises a first adjusting unit assigned to a gas exchange valve of a first cylinder and a second adjusting unit assigned to the gas exchange valve of a second cylinder
ATE537334T1 (en) * 2008-03-12 2011-12-15 Kawasaki Heavy Ind Ltd VALVE OPERATION MECHANISM

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020101555A1 (en) 2020-01-23 2021-07-29 Bayerische Motoren Werke Aktiengesellschaft Stroke variable valve train with a double leg spring
WO2021148199A1 (en) 2020-01-23 2021-07-29 Bayerische Motoren Werke Aktiengesellschaft Variable-stroke valve drive with a double leg spring

Also Published As

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EP2568132A1 (en) 2013-03-13
DE102011082226A1 (en) 2013-03-07

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