EP1847690A2 - Swing arm for a variable stroke valve gear - Google Patents

Swing arm for a variable stroke valve gear Download PDF

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Publication number
EP1847690A2
EP1847690A2 EP07105922A EP07105922A EP1847690A2 EP 1847690 A2 EP1847690 A2 EP 1847690A2 EP 07105922 A EP07105922 A EP 07105922A EP 07105922 A EP07105922 A EP 07105922A EP 1847690 A2 EP1847690 A2 EP 1847690A2
Authority
EP
European Patent Office
Prior art keywords
rocker arm
lever
support surface
forming
end portion
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
EP07105922A
Other languages
German (de)
French (fr)
Other versions
EP1847690B1 (en
EP1847690A3 (en
Inventor
Wolfgang Christgen
Thomas Kern
Jürgen KRETSCHMER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
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Schaeffler KG
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Publication date
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Publication of EP1847690A2 publication Critical patent/EP1847690A2/en
Publication of EP1847690A3 publication Critical patent/EP1847690A3/en
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Publication of EP1847690B1 publication Critical patent/EP1847690B1/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
    • 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
    • F01L13/0021—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 rocker arm ratio
    • 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
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0021—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 rocker arm ratio
    • F01L13/0026—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 rocker arm ratio by means of an eccentric
    • 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
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the invention relates to a rocker arm for a variable-stroke valve drive of an internal combustion engine.
  • the oscillating lever has an end face of a first end portion extending around a swing axis, convexly cylindrical support surface and the front end of a second end portion rigidly connected to the rocker Hubübertragungs simulation for a valve lever and in a central portion a cam contact surface.
  • rocker arm is considered from the considered generic DE 102 35 402 A1 out.
  • the rocker arm proposed there is supported as an adjustable transmission element of the variable-stroke valve drive with its first end portion of a stationary arranged in the engine, arcuate link path and actuates with the running at the second end Hub Hubungsungs founded a drag lever, in turn a gas exchange valve acted upon.
  • the opening profile of the gas exchange valve is variably adjustable by the displaceable on the slide track by means of an adjustment in the form of an eccentric swing axis of the support surface in conjunction with the Hubübertragungs tone, which is composed of a Leerhubkurve and a lift curve, a Nockenanlauf phenomenon acting cam lift in a variable pivoting movement of the finger lever.
  • both the support surface and the cam contact surface are each formed as a roller mounted on a rocker arm mounted in the rocker arm.
  • the invention is therefore an object of the invention to avoid these disadvantages and thus to provide a rocker arm, which is both high precision corresponding lowest, for the opening history of the gas exchange valve relevant component tolerances as well as inexpensive to produce and beyond a low mass effect unfolds.
  • this object is achieved in that the support surface and / or the cam abutment surface are formed as rigidly connected to the rocker sliding surfaces.
  • a moderate friction disadvantage of the entire valve train friction which can additionally be minimized by suitable friction and wear-reducing coatings of the sliding surfaces, is thereby overcompensated for by the fact that the precision requirements for the oscillating lever due to the substitution of a roller bearing bearing contact surface with additional tolerances thanks to a rigid sliding surface, considerably less expensive and, thanks to the reduced component complexity, also significantly less expensive to fulfill.
  • the weight of the rocker arm and thus its mass effect is positively influenced, since the material cost for a rigid sliding surface naturally limited to their contact area against their contact partners and their connection to the rocker arm.
  • each sliding surface may also be formed as a separate and preferably materially connected to the rocker arm component
  • the rocker arm should be made in a particularly advantageous in terms of its manufacturing cost and weight of the invention as a one-piece sheet metal.
  • the rocker arm which has both a rigid support surface and a rigid cam contact surface in this embodiment, should continue to have two spaced sidewalls in favor of its dimensional stability, at the first end portion via a cylindrical surface forming the support surface, at the second end portion via the Hubübertragungs Solution forming end wall and in the Middle section are connected to one another via a transverse web forming the cam contact surface.
  • FIGS. 1 and 2 disclose a first exemplary embodiment of an oscillating lever 1a according to the invention for a variable-stroke valve drive for throttle-free load control of an internal combustion engine.
  • the oscillating lever 1a produced in a stamping and bending process of sheet metal material has two spaced side walls 2, which are connected to one another at a first end section 3 via a cylindrical shell 4 and at a second end section 5 via an end wall 6.
  • a Hubübertragungs character 10 for a valve lever which is usually designed as mounted on a support roller roller follower. This transmits the of a lifting cam 11, which adjoins the Hubübertragungs character 10 to a Leerhubkurve 12, predetermined stroke movement of oscillating about the swing axis 8 oscillating lever 1a on a gas exchange valve of the internal combustion engine.
  • the oscillating lever 1a is acted upon in a central section 13 via a cam contact surface 14 by a cam of a camshaft of the internal combustion engine, the cam abutment surface 14 in this exemplary embodiment being designed as a roller 16 sliding or roller-mounted on a bolt connecting the side walls 2 is.
  • FIG. 1 A second embodiment of a rocker arm 1b according to the invention is shown in FIG.
  • This oscillating lever 1 b is likewise a component produced in a stamping and bending process from sheet metal, but in this case in one piece.
  • the rocker arm 1b is different relative to the rocking lever 1a characterized in that both the support surface 9 and the cross-member 17 connecting the side walls 2 extending cam contact surface 14 are formed as a rigid sliding surfaces 7 and 18 respectively

Landscapes

  • 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

Rocker arm (1b) comprises a convex cylindrical support surface (9) and a cam running surface (14) formed as sliding surfaces. Preferred Features: The rocker arm is formed as a one-piece sheet metal deformed part. The rocker arm has side walls (2) joined together at a first end section via a cylinder shell forming the support surface, at a second end section via a front wall forming a lifting transition surface and in a middle section via a crossbar (17) forming the cam running surface.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen Schwinghebel für einen hubvariablen Ventiltrieb einer Brennkraftmaschine. Der Schwinghebel weist stirnseitig eines ersten Endabschnitts eine um eine Schwingachse verlaufende, konvex zylindrisch ausgebildete Abstützfläche und stirnseitig eines zweiten Endabschnitts eine mit dem Schwinghebel starr verbundene Hubübertragungsfläche für einen Ventilhebel sowie in einem Mittelabschnitt eine Nockenanlauffläche auf.The invention relates to a rocker arm for a variable-stroke valve drive of an internal combustion engine. The oscillating lever has an end face of a first end portion extending around a swing axis, convexly cylindrical support surface and the front end of a second end portion rigidly connected to the rocker Hubübertragungsfläche for a valve lever and in a central portion a cam contact surface.

Hintergrund der ErfindungBackground of the invention

Ein derartiger Schwinghebel geht aus der als gattungsbildend betrachteten DE 102 35 402 A1 hervor. Der dort vorgeschlagene Schwinghebel stützt sich als verstellbares Übertragungselement des hubvariablen Ventiltriebs mit seinem ersten Endabschnitt an einer in der Brennkraftmaschine ortsfest angeordneten, kreisbogenförmigen Kulissenbahn ab und betätigt mit der am zweiten Endabschnitt verlaufenden Hubübertragungsfläche einen Schlepphebel, der seinerseits ein Gaswechselventil beaufschlagt. Dabei ist der Öffnungsverlauf des Gaswechselventils variabel einstellbar, indem die auf der Kulissenbahn mittels einer Verstelleinrichtung in Form eines Exzenters verlagerbare Schwingachse der Abstützfläche in Verbindung mit der Hubübertragungsfläche, die aus einer Leerhubkurve und einer Hubkurve zusammengesetzt ist, einen die Nockenanlauffläche beaufschlagenden Nockenhub in eine veränderliche Schwenkbewegung des Schlepphebels umsetzt. Zur Reduzierung der Ventiltriebsreibung sind sowohl die Abstützfläche als auch die Nockenanlauffläche als jeweils auf einem im Schwinghebel befestigten Bolzen wälzgelagerte Rolle ausgebildet.Such a rocker arm is considered from the considered generic DE 102 35 402 A1 out. The rocker arm proposed there is supported as an adjustable transmission element of the variable-stroke valve drive with its first end portion of a stationary arranged in the engine, arcuate link path and actuates with the running at the second end Hub Hubungsungsfläche a drag lever, in turn a gas exchange valve acted upon. In this case, the opening profile of the gas exchange valve is variably adjustable by the displaceable on the slide track by means of an adjustment in the form of an eccentric swing axis of the support surface in conjunction with the Hubübertragungsfläche, which is composed of a Leerhubkurve and a lift curve, a Nockenanlauffläche acting cam lift in a variable pivoting movement of the finger lever. To reduce the valve train friction, both the support surface and the cam contact surface are each formed as a roller mounted on a rocker arm mounted in the rocker arm.

Wie es in der ebenfalls gattungsgemäßen DE 102 35 403 A1 vorgeschlagen ist, kann als Abstützfläche auch ein Rollenpaket mit sich an der Kulissenbahn und am Exzenter separat abstützenden Rollen vorgesehen sein. Obwohl die genannten Wälzkontakte eine hochwirksame Einzelmaßnahme zur Reduzierung der Verlustreibung und auch des Bauteilverschleißes im Ventiltrieb darstellen können, sind diese speziell im Falle des hier vorliegenden, zur drosselfreien Laststeuerung der Brennkraftmaschine dienenden Ventiltriebs dennoch mit einigen Nachteilen verbunden. Zum einen toleriert diese Art der Laststeuerung nur geringste Steuerzeitenabweichungen der Gaswechselventile untereinander, so dass die Ventiltriebsbauteile mit höchster Präzision und üblicherweise in einem Toleranzfenster von nur wenigen Mikrometern gefertigt werden müssen. Das Einhalten derartiger Bauteilgenauigkeiten unter Großserienbedingungen und dem dabei üblicherweise eng gesteckten Herstellkostenrahmen wird jedoch durch die genannten Wälzlagerungen erheblich dadurch erschwert, dass jedes mit dem Grundkörper des Schwinghebels zu verbindende Zusatzbauteil die für Abweichungen im Öffnungsverlauf der Gaswechselventile maßgebliche Bauteiltoleranzkette erweitert. Dies betrifft insbesondere die im Grundkörper des Schwinghebels einzubringende Positionstoleranz der Bohrung, in der der Bolzen zur Rollenlagerung aufgenommen ist, das toleranzbehaftete Lagerspiel der Wälzlagerung sowie auch toleranzbedingt schwankende Außendurchmesser der Rollen.As in the also generic DE 102 35 403 A1 is proposed, may be provided as support surface and a roll package with itself on the slide track and on the eccentric supporting rollers. Although the rolling contacts mentioned can represent a highly effective individual measure for reducing the loss of friction and also the component wear in the valve train, these are still associated with some disadvantages especially in the case of the present here, throttle-free load control of the internal combustion engine. On the one hand tolerates this type of load control only the slightest timing deviations of the gas exchange valves with each other, so that the valve train components with the highest precision and usually must be made in a tolerance window of only a few microns. However, compliance with such component accuracies under high-volume conditions and the usually tight production cost framework is considerably hindered by the aforementioned rolling bearings in that each additional component to be connected to the main body of the rocker arm expands the component tolerance chain that is decisive for deviations in the opening course of the gas exchange valves. This relates in particular to the positional tolerance of the bore to be introduced in the main body of the oscillating lever, in which the bolt is accommodated for roller bearing, the tolerance-bearing bearing clearance of the roller bearing as well as tolerance-varying outer diameter of the rollers.

Ein weiterer Nachteil ergibt sich aus dem erhöhten Gewicht des mit den Wälzlagerungen versehenen Schwinghebels, dessen Massenwirkung von einem zusätzlich zur Ventilfeder vorzusehenden Federmittel abgestützt werden muss. Insofern können die sich hieraus ergebenden Reaktionskräfte zu einer beträchtlichen Aufhebung der ursprünglich durch die Wälzlagerung erzielten Reibungsvorteile führen.A further disadvantage results from the increased weight of the rocker arm provided with the roller bearings, the mass action of which must be supported by a spring means to be provided in addition to the valve spring. As such, the resulting reaction forces can lead to a significant cancellation of the initial friction achieved by the rolling bearing.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt daher die Aufgabe zugrunde, diese geschilderten Nachteile zu vermeiden und somit einen Schwinghebel zu schaffen, der sowohl hochpräzise entsprechend geringster, für den Öffnungsverlauf des Gaswechselventils maßgeblicher Bauteiltoleranzen als auch kostengünstig herstellbar ist und darüber hinaus eine geringe Massenwirkung entfaltet.The invention is therefore an object of the invention to avoid these disadvantages and thus to provide a rocker arm, which is both high precision corresponding lowest, for the opening history of the gas exchange valve relevant component tolerances as well as inexpensive to produce and beyond a low mass effect unfolds.

Zusammenfassung der ErfindungSummary of the invention

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Abstützfläche und/oder die Nockenanlauffläche als mit dem Schwinghebel starr verbundene Gleitflächen ausgebildet sind. Ein sich dabei gegenüber den vorgenannten Wälzkontakten einstellender moderater Reibungsnachteil der gesamten Ventiltriebsreibung, welcher überdies durch geeignete reibungs- und verschleißreduzierende Beschichtungen der Gleitflächen minimiert werden kann, wird dadurch überkompensiert, dass sich die Präzisionsanforderungen an den Schwinghebel aufgrund der Substitution einer mit zusätzlichen Toleranzen behafteten wälzgelagerten Kontaktfläche durch eine starre Gleitfläche erheblich aufwandsärmer und dank der reduzierten Bauteilkomplexität auch deutlich kostengünstiger erfüllen lassen. Darüber hinaus wird auch das Gewicht des Schwinghebels und somit dessen Massenwirkung positiv beeinflusst, da sich der Materialaufwand für eine starre Gleitfläche naturgemäß auf deren Kontaktbereich gegenüber ihrem Kontaktpartner und auf deren Anbindung an den Schwinghebel beschränkt.According to the invention this object is achieved in that the support surface and / or the cam abutment surface are formed as rigidly connected to the rocker sliding surfaces. A moderate friction disadvantage of the entire valve train friction, which can additionally be minimized by suitable friction and wear-reducing coatings of the sliding surfaces, is thereby overcompensated for by the fact that the precision requirements for the oscillating lever due to the substitution of a roller bearing bearing contact surface with additional tolerances thanks to a rigid sliding surface, considerably less expensive and, thanks to the reduced component complexity, also significantly less expensive to fulfill. In addition, the weight of the rocker arm and thus its mass effect is positively influenced, since the material cost for a rigid sliding surface naturally limited to their contact area against their contact partners and their connection to the rocker arm.

Während jede Gleitfläche auch als separates und vorzugsweise stoffschlüssig mit dem Schwinghebel verbundenes Bauteil ausgebildet sein kann, soll der Schwinghebel in einer hinsichtlich seiner Herstellkosten und seines Gewichts besonders bevorzugten Weiterbildung der Erfindung als einteiliges Blechumformteil hergestellt sein. Der Schwinghebel, der in dieser Ausgestaltung sowohl eine starre Abstützfläche als auch eine starre Nockenanlauffläche aufweist, soll zugunsten seiner Formsteifigkeit weiterhin zwei beabstandete Seitenwände aufweisen, die am ersten Endabschnitt über eine die Abstützfläche bildende Zylinderschale, am zweiten Endabschnitt über eine die Hubübertragungsfläche bildende Stirnwand und im Mittelabschnitt über einen die Nockenanlauffläche bildenden Quersteg miteinander verbunden sind. Diese abwechselnd kasten- und U-profilförmige Ausgestaltung des überdies aufgrund der fehlenden Wälzlager vergleichsweise schmal bauenden Schwinghebels dient in hohem Maße zu dessen Versteifung, so dass insbesondere auch der Herstellungsaufwand für den im zitierten Stand der Technik vorgeschlagenen Versteifungsbügel zwischen den Seitenwänden entfallen kann.While each sliding surface may also be formed as a separate and preferably materially connected to the rocker arm component, the rocker arm should be made in a particularly advantageous in terms of its manufacturing cost and weight of the invention as a one-piece sheet metal. The rocker arm, which has both a rigid support surface and a rigid cam contact surface in this embodiment, should continue to have two spaced sidewalls in favor of its dimensional stability, at the first end portion via a cylindrical surface forming the support surface, at the second end portion via the Hubübertragungsfläche forming end wall and in the Middle section are connected to one another via a transverse web forming the cam contact surface. This alternately box- and U-shaped profile of the addition due to the lack of rolling bearings comparatively narrow-built rocker arm is used to a great extent to its stiffening, so that in particular the production cost of the proposed in the cited prior art stiffening bracket between the side walls can be omitted.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den Zeichnungen, in denen Ausführungsbeispiele der Erfindung vereinfacht dargestellt sind. Sofern nicht anders aufgeführt, sind dabei funktionsgleiche Merkmale mit gleichen Bezugszeichen versehen. Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel eines Schwinghebels in perspektivischer Darstellung;
Figur 2
den Schwinghebel gemäß Figur 1 in der Seitenansicht und
Figur 3
ein zweites Ausführungsbeispiel eines Schwinghebels in perspektivischer Darstellung.
Further features of the invention will become apparent from the following description and from the drawings, in which embodiments of the invention are shown in simplified form. Unless otherwise stated, functionally identical features are provided with the same reference numerals. Show it:
FIG. 1
a first embodiment of a rocker arm in perspective view;
FIG. 2
the rocker arm according to Figure 1 in side view and
FIG. 3
A second embodiment of a rocker arm in perspective view.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

In den Figuren 1 und 2 ist ein erstes Ausführungsbeispiel eines erfindungsgemäßen Schwinghebels 1a für einen hubvariablen Ventiltrieb zur drosselfreien Laststeuerung einer Brennkraftmaschine offenbart. Der in einem Stanz-Biegeprozess aus Blechwerkstoff hergestellte Schwinghebel 1a weist zwei beabstandete Seitenwände 2 auf, die an einem ersten Endabschnitt 3 über eine Zylinderschale 4 und an einem zweiten Endabschnitt 5 über eine Stirnwand 6 miteinander verbunden sind. Dabei dient eine auf der Zylinderschale 4 verlaufende Gleitfläche 7, deren Mittelpunkt auf einer Schwingachse 8 des Schwinghebels 1a liegt, als Abstützfläche 9 gegenüber einer - hier nicht dargestellten - in der Brennkraftmaschine kreisbogenförmig verlaufenden Kulissenbahn und gleichzeitig als Abgriffsfläche für einen ebenfalls nicht dargestellten Exzenter einer Verstelleinrichtung, durch welchen die Position der Schwingachse 8 auf der Kulissenbahn zur Variation des Ventilhubs festgelegt ist.FIGS. 1 and 2 disclose a first exemplary embodiment of an oscillating lever 1a according to the invention for a variable-stroke valve drive for throttle-free load control of an internal combustion engine. The oscillating lever 1a produced in a stamping and bending process of sheet metal material has two spaced side walls 2, which are connected to one another at a first end section 3 via a cylindrical shell 4 and at a second end section 5 via an end wall 6. Here is a running on the cylinder shell 4 sliding surface 7, the center is located on a swing axis 8 of the rocking lever 1a, as a support surface 9 against a - not shown here - in the engine circular arc extending link track and at the same time as Abgriffsfläche for a likewise not shown eccentric adjustment , By which the position of the swing axle 8 is set on the slide track for varying the valve lift.

Auf der Außenseite der Stirnwand 6 verläuft eine Hubübertragungsfläche 10 für einen Ventilhebel, der üblicherweise als auf einem Abstützelement gelagerter Rollenschlepphebel ausgebildet ist. Dieser überträgt die von einer Hubkurve 11, die sich auf der Hubübertragungsfläche 10 an eine Leerhubkurve 12 anschließt, vorgegebene Hubbewegung des um die Schwingachse 8 pendelnden Schwinghebels 1a auf ein Gaswechselventil der Brennkraftmaschine.On the outside of the end wall 6 extends a Hubübertragungsfläche 10 for a valve lever, which is usually designed as mounted on a support roller roller follower. This transmits the of a lifting cam 11, which adjoins the Hubübertragungsfläche 10 to a Leerhubkurve 12, predetermined stroke movement of oscillating about the swing axis 8 oscillating lever 1a on a gas exchange valve of the internal combustion engine.

Ferner ist der Schwinghebel 1a in einem Mittelabschnitt 13 über eine Nockenanlauffläche 14 von einem Nocken einer - hier nicht dargestellten - Nockenwelle der Brennkraftmaschine beaufschlagt, wobei die Nockenanlauffläche 14 in diesem Ausführungsbeispiel als auf einem die Seitenwände 2 verbindenden Bolzen 15 gleit- oder wälzgelagerte Rolle 16 ausgebildet ist.Furthermore, the oscillating lever 1a is acted upon in a central section 13 via a cam contact surface 14 by a cam of a camshaft of the internal combustion engine, the cam abutment surface 14 in this exemplary embodiment being designed as a roller 16 sliding or roller-mounted on a bolt connecting the side walls 2 is.

Ein zweites Ausführungsbeispiel eines erfindungsgemäßen Schwinghebels 1b ist in Figur 3 dargestellt. Bei diesem Schwinghebel 1 b handelt es sich ebenfalls um ein in einem Stanz-Biegeprozess aus Blech hergestelltes, jedoch in diesem Fall einteilig ausgebildetes Bauteil. Der Schwinghebel 1b unterscheidet sich gegenüber dem Schwinghebel 1a dadurch, dass sowohl die Abstützfläche 9 als auch die auf einem die Seitenwände 2 verbindenden Quersteg 17 verlaufende Nockenanlauffläche 14 als starre Gleitflächen 7 beziehungsweise 18 ausgebildet sindA second embodiment of a rocker arm 1b according to the invention is shown in FIG. This oscillating lever 1 b is likewise a component produced in a stamping and bending process from sheet metal, but in this case in one piece. The rocker arm 1b is different relative to the rocking lever 1a characterized in that both the support surface 9 and the cross-member 17 connecting the side walls 2 extending cam contact surface 14 are formed as a rigid sliding surfaces 7 and 18 respectively

BezugszahlenlisteLIST OF REFERENCE NUMBERS

1a, b1a, b
Schwinghebelrocker
22
SeitenwandSide wall
33
erster Endabschnittfirst end section
44
Zylinderschalecylindrical shell
55
zweiter Endabschnittsecond end section
66
Stirnwandbulkhead
77
Gleitflächesliding surface
88th
Schwingachseswing axle
99
Abstützflächesupporting
1010
HubübertragungsflächeHubübertragungsfläche
1111
Hubkurvestroke curve
1212
LeerhubkurveLeerhubkurve
1313
Mittelabschnittmidsection
1414
NockenanlaufflächeCam contacting surface
1515
Bolzenbolt
1616
Rollerole
1717
Querstegcrosspiece
1818
Gleitflächesliding surface

Claims (3)

Schwinghebel für einen hubvariablen Ventiltrieb einer Brennkraftmaschine, welcher Schwinghebel (1a, 1 b) stirnseitig eines ersten Endabschnitts (3) eine um eine Schwingachse (8) verlaufende, konvex zylindrisch ausgebildete Abstützfläche (9), stirnseitig eines zweiten Endabschnitts (5) eine mit dem Schwinghebel (1a, 1 b) starr verbundene Hubübertragungsfläche (10) für einen Ventilhebel und in einem Mittelabschnitt (13) eine Nockenanlauffläche (14) aufweist, dadurch gekennzeichnet, dass die Abstützfläche (9) und/oder die Nockenanlauffläche (14) als mit dem Schwinghebel (1a, 1b) starr verbundene Gleitflächen (7, 18) ausgebildet sind.Oscillating lever for a variable-stroke valve drive of an internal combustion engine, which oscillating lever (1 a, 1 b) a front end of a first end portion (3) around a swing axis (8) extending convexly cylindrical support surface (9), the end face of a second end portion (5) with a Rocking lever (1 a, 1 b) rigidly connected Hubübertragungsfläche (10) for a valve lever and in a central portion (13) has a Nockenanlauffläche (14), characterized in that the support surface (9) and / or the Nockenanlauffläche (14) than with the Oscillating lever (1a, 1b) rigidly connected sliding surfaces (7, 18) are formed. Schwinghebel nach Anspruch 1, dadurch gekennzeichnet, dass der Schwinghebel (1 b) als einteiliges Blechumformteil hergestellt ist.Rocker arm according to claim 1, characterized in that the rocking lever (1 b) is made as a one-piece sheet metal forming part. Schwinghebel nach Anspruch 2, dadurch gekennzeichnet, dass der Schwinghebel (1 b) zwei beabstandete Seitenwände (2) aufweist, die am ersten Endabschnitt (3) über eine die Abstützfläche (9) bildende Zylinderschale (4), am zweiten Endabschnitt (5) über eine die Hubübertragungsfläche (10) bildende Stirnwand (6) und im Mittelabschnitt (13) über einen die Nockenanlauffläche (14) bildenden Quersteg (17) miteinander verbunden sind.Rocker arm according to claim 2, characterized in that the rocking lever (1 b) has two spaced side walls (2) at the first end portion (3) via a cylinder shell (4) forming the support surface (9) at the second end portion (5) an end wall (6) forming the stroke-transfer surface (10) and in the middle section (13) via a transverse web (17) forming the cam contact surface (14) are connected to one another.
EP07105922A 2006-04-21 2007-04-11 Swing arm for a variable stroke valve gear Expired - Fee Related EP1847690B1 (en)

Applications Claiming Priority (1)

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DE102006018511A DE102006018511A1 (en) 2006-04-21 2006-04-21 Rocker arm for a variable-stroke valve train

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EP1847690A3 EP1847690A3 (en) 2010-01-27
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DE102011003898B4 (en) 2011-02-10 2021-09-09 Schaeffler Technologies AG & Co. KG Intermediate lever
CN103147818B (en) * 2013-02-28 2015-05-06 长城汽车股份有限公司 Drive device with variable valve lift, engine and vehicle
CN103161538B (en) * 2013-02-28 2015-04-22 长城汽车股份有限公司 Variable valve lift driving device rocker mechanism used for engine
DE102013217298A1 (en) 2013-08-30 2015-03-05 Schaeffler Technologies Gmbh & Co. Kg Rocker arm for a valve train of an internal combustion engine of a vehicle and method for producing a rocker arm
DE102016220397A1 (en) * 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train

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DE1845656U (en) * 1959-02-03 1962-01-25 Daimler Benz Ag DEVICE FOR OPERATING THE VALVES IN COMBUSTION ENGINE.
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US20030029403A1 (en) * 1998-03-12 2003-02-13 Nsk Ltd. Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof
JP2003239713A (en) * 2002-02-18 2003-08-27 Toyota Motor Corp Valve mechanism for internal combustion engine
WO2004083607A2 (en) * 2003-03-18 2004-09-30 General Motors Corporation Engine valve actuator assembly
DE10316990A1 (en) * 2003-04-11 2004-10-28 Rolf Jung Fully-variable valve operating gear for vehicle engine includes cams with inclined running surfaces operated in longitudinal direction by adjuster
US6684832B1 (en) * 2003-04-28 2004-02-03 Roberto Marcelo Codina Oscillating camshaft controlled valve operating device
EP1744021A2 (en) * 2005-07-11 2007-01-17 Eaton Corporation Stamped two-step rocker arm component

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EP1847690B1 (en) 2013-01-16
DE102006018511A1 (en) 2007-10-25
CN101059088A (en) 2007-10-24
EP1847690A3 (en) 2010-01-27

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