EP1616082B1 - Rocker arm of a valve gear of a combustion engine - Google Patents

Rocker arm of a valve gear of a combustion engine Download PDF

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Publication number
EP1616082B1
EP1616082B1 EP04759598A EP04759598A EP1616082B1 EP 1616082 B1 EP1616082 B1 EP 1616082B1 EP 04759598 A EP04759598 A EP 04759598A EP 04759598 A EP04759598 A EP 04759598A EP 1616082 B1 EP1616082 B1 EP 1616082B1
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EP
European Patent Office
Prior art keywords
rocker arm
lever
slide
arm according
arms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04759598A
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German (de)
French (fr)
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EP1616082A1 (en
Inventor
Joachim Seitz
Bodo RÖRIG
Anteo Opipari
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.)
IHO Holding GmbH and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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Publication of EP1616082A1 publication Critical patent/EP1616082A1/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
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • 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
    • F01L2001/186—Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20882—Rocker arms

Definitions

  • Rocker arm of a valve train of an internal combustion engine which is switchable to different strokes for at least one gas exchange valve, with an outer lever and extending between the arms inner lever, both levers are pivotable relative to each other and coupling means coupled to each other, so that when coupling a large and decoupling a small or 0-valve stroke is generated, wherein applied to a bottom of the finger lever at one end a system for a gas exchange valve and at the other end a complementary surface for a support and at an upper side of the outer lever at least one mating surface for a panoramichubnocken and at an upper side of the Inner lever a mating surface is provided for a small or 0-stroke cam.
  • Such a drag lever is out of the DE-OS 27 53 197 previously known.
  • a coupling means a pawl is provided, which engages below the inner lever and is displaceable via a complex linkage mechanism.
  • the latch increases disadvantageously the overall height of the switchable rocker arm.
  • the external application of the linkage proves to be relatively complex.
  • the object of the invention is therefore to provide a drag lever of the aforementioned type, in which the cited disadvantages are eliminated by simple means.
  • this object is achieved in that the arms of the outer lever are connected in the region of the end at the complementary surface by a transverse bar, wherein in the inner lever one above the complementary surface extending, and outgoing from the other end, smooth-bore blind bore with a longitudinally displaceable slide is applied as a coupling agent, which slide for the coupling of the lever from the blind bore is displaced so that it partially engages under a trained as a bottom cam surface of the crossbar, wherein the Inner lever on its upper side, to the mating surface, is largely smooth surface and extends from this, at least largely flush with its upper side on the side of its complementary surface, at least one finger-like height stop means for the outer lever on the crossbar away and wherein the inner lever in the region of the end is pivotally connected to the arms of the outer lever on the side of the gas exchange valve.
  • the rocker arm builds overall, even in its vertical direction, very compact, so that in a subsequent implementation in itself finished cylinder heads for non-switchable valve trains here no major problems are to be expected or several engine series can be operated.
  • the complementary surface for the support element coupling means (slide) with its pressure chamber only very short hydraulic paths are present. It is also found that due to the favorable leverage ratios in the coupling region is expected only with a relatively low component load.
  • the blind hole for the coupling means can also be easily produced in one operation, it being particularly advantageous that the inner lever has "flat" outgoing from this height stops. It can be shown for the coupling case an excellent position assignment of the blind bore to the driver surface and at the same time a captive.
  • the slide is to be displaced longitudinally outwards for its coupling case, it is also conceivable that it may be used for producing a coupling to move in.
  • the slider engages in a simple manner preferably under a bottom of a lying in the region crossbar of the outer lever.
  • the slider may be opposite stop means for limiting its coupling movement on the crossbar.
  • a sleeve is provided in the blind bore, at one end face of the slider undergoes a travel limit.
  • there may also be nose-like projections or attacks of a general nature at the bottom of the crossbar.
  • the bore may be provided with a stop. It also makes sense to train the hole stepped.
  • the slide is displaced in only one direction of displacement via the hydraulic medium pressure and in its other direction via the force of a spring means such as a helical compression spring.
  • a spring means such as a helical compression spring.
  • the blind hole for the slide can also be applied alternatively in a separate insert.
  • This is connected to the inner lever by means familiar with the art connection measures, such as by welding, caulking, press-fitting or the like.
  • connection measures such as by welding, caulking, press-fitting or the like.
  • one-part preparation is preferred.
  • the levers of a lightweight material such as sheet metal. This has an advantageous effect on the total mass of the finger lever and the manufacturing costs for this. It is also conceivable, however, a casting technology training (investment casting) of the finger lever.
  • the drag lever can also be manufactured in a metal injection molding process (MIM - "Metal Injection Molding).
  • the figures disclose a switchable to different cam strokes cam followers 1.
  • This consists of an outer lever 2, which is connected at one end 9 by a crossbar 15.
  • An inner lever 4 is located between arms 3 of the outer lever 2 and is pivotally connected to the outer lever 2 in the region of another end 7.
  • the inner lever 4 extends on an axis 32 which sits axially outside in bores of the arms 3 of the outer lever 2.
  • a torsion leg spring is provided which surrounds the axis 32 within the inner lever 4 and exerts a return movement to the outer lever 2 with their arms not to be explained in the decoupling of the outer lever 2 from the inner lever.
  • the arms 3 of the outer lever 2 at its upper side 11 each have a mating surface 12 for Quihubnocken.
  • This mating surface 12 is formed as a sliding surface.
  • the inner lever 4, however, has in the region of this center, in the section of its upper side 13, also a mating surface 14 for a small stroke cam.
  • This mating surface 14 is shown here as a rotatable roller. It can also be seen that the outer lever 2 is closed in the region of the end 7 by a transverse bar 31, so that it forms a rectangle-like profile as a whole in plan view.
  • a bottom 6 (see FIG. 2 ) has the inner lever 4 in the region of the end 7 a system 8 for a gas exchange valve.
  • a complementary surface 10 dome-shaped type is introduced into the bottom 6 of the inner lever 4.
  • the complementary surface 10 is located below a pressure chamber 19, the one end of a bottom 16 a of a smooth-bore blind bore 16 and the other end of a piston surface 20 of a ring extension 17 a of a slider 17 as Coupling means 5 is limited.
  • a path 20a extends obliquely rearwardly in the lever direction, which intersects the pressure chamber 19 and thus supplies it with hydraulic fluid.
  • the slider 17 consists of said ring extension 17 a, which extends directly in the blind bore 16. At the ring extension 17a is followed in the direction of the blind bore 16 out a thin-walled section 23 at. This has axially outside a front side 35th
  • a stop means 18a extends in the blind bore 16. This is made here as a thin-walled ring, which is fastened with its outer jacket directly in the blind bore 16.
  • Fig. 2 shows the stop state (coupling) of the slider 17 at the stop means 18a. Thus, this is prevented from further unwanted extension.
  • the section 23 is enclosed by a spring means 22. This is supported axially on the inside of the ring extension 17a. Axially outward, the spring means 22 experiences a contact with a sleeve 24, which is directly penetrated by the portion 23 and extends with its outer jacket in a bore of the stop means 18a.
  • FIG. 2 shows the coupling state of the outer lever 2 with the inner lever 4.
  • FIG. 1 it is further provided, on the upper side 13 of the inner lever 4 in the region of the end 9 to arrange two arms 27 of the inner lever 4 extending height stop means 34. These go here in alignment as “smooth" extensions of the top 13 in the direction of the end 9 and are designed as fingers. They protrude over an upper side 38 of the crossbar 15 of the outer lever 2.
  • the slide 17 can "pinpoint" the driving surface 18 of the outer lever 2 engage if necessary ,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

A finger lever ( 1 ) that can be switched for different cam lifts is provided. The finger lever includes an outer arm ( 2 ), between whose limbs ( 3 ) an inner arm ( 4 ) is pivotally mounted. Inside the inner arm ( 4 ), starting form one end ( 9 ), a blind borehole ( 16 ) is provided with a coupling element ( 5 ), which can be longitudinally displaced therein and which, in the event of coupling, can be displaced partially under a driver surface ( 18 ) of a crossbar ( 15 ) of the outer arm ( 2 ). Height stopping parts ( 34 ) are provided on the inner arm ( 4 ) in the form of a simple, finger-like extension of the inner arm ( 4 ) at the end ( 9 ) thereof which extend out over the crossbar ( 15 ).

Description

Gebiet der ErfindungField of the invention

Schlepphebel eines Ventiltriebs einer Brennkraftmaschine, der auf unterschiedliche Hübe für wenigstens ein Gaswechselventil umschaltbar ist, mit einem Außenhebel und einem zwischen dessen Armen verlaufenden Innenhebel, wobei beide Hebel relativ zueinander verschwenkbeweglich und über Koppelmittel miteinander koppelbar sind, so daß bei Kopplung ein großer und bei Entkopplung ein kleiner oder 0-Ventilhub generiert ist, wobei an einer Unterseite des Schlepphebels an einem Ende eine Anlage für ein Gaswechselventil und am anderen Ende eine Komplementärfläche für ein Abstützelement appliziert sowie an einer Oberseite des Außenhebels wenigstens eine Gegenlauffläche für einen Großhubnocken und an einer Oberseite des Innenhebels eine Gegenlauffläche für einen Klein- bzw. 0-Hubnocken vorgesehen ist.Rocker arm of a valve train of an internal combustion engine, which is switchable to different strokes for at least one gas exchange valve, with an outer lever and extending between the arms inner lever, both levers are pivotable relative to each other and coupling means coupled to each other, so that when coupling a large and decoupling a small or 0-valve stroke is generated, wherein applied to a bottom of the finger lever at one end a system for a gas exchange valve and at the other end a complementary surface for a support and at an upper side of the outer lever at least one mating surface for a Großhubnocken and at an upper side of the Inner lever a mating surface is provided for a small or 0-stroke cam.

Hintergrund der ErfindungBackground of the invention

Ein derartiger Schlepphebel ist aus der DE-OS 27 53 197 vorbekannt. Als Koppelmittel ist eine Klinke vorgesehen, welche unterhalb des Innenhebels angreift und über einen aufwändigen Gestängemechanismus verlagerbar ist. Die Klinke erhöht in nachteiliger Art und Weise die Bauhöhe des schaltbaren Schlepphebels. Gleichfalls erweist sich die externe Beaufschlagung über das Gestänge als relativ aufwändig.Such a drag lever is out of the DE-OS 27 53 197 previously known. As a coupling means, a pawl is provided, which engages below the inner lever and is displaceable via a complex linkage mechanism. The latch increases disadvantageously the overall height of the switchable rocker arm. Likewise, the external application of the linkage proves to be relatively complex.

Auch geht aus der DE 102 11 038 A1 eine schaltbare Hebelanordnung hervor, in deren Außenhebel ein Schieber zur Kopplung angeordnet ist. Dieser Schieber kann über extern angeordnete elektromagnetische Mittel verlagert werden. Auch hier ist klar, dass diese externe Beaufschlagung des Schiebers den notwendigen Bauraum für den schaltbaren Schlepphebel im Zylinderkopfbereich unnötigerweise erhöht. Auch baut der vorgenannte Schlepphebel somit unerwünscht lang. Zudem wird festgestellt, daß wegen des relativ kurzen Innenhebels bei dessen Kopplung mit dem Außenhebel mit relativ großen Kräften und somit Bauteilbeiastungen im Kopplungsbereich zu rechnen ist.Also goes from the DE 102 11 038 A1 a switchable lever arrangement, in whose outer lever a slide is arranged for coupling. This slide can be displaced via externally arranged electromagnetic means. Again, it is clear that this external loading of the slide unnecessarily increases the necessary space for the switchable drag lever in the cylinder head area. Also, the aforementioned drag lever thus builds undesirably long. In addition, it is found that due to the relatively short inner lever in its coupling with the outer lever with relatively large forces and thus component loads in the coupling region is to be expected.

Das Dokument US 6532920 zeigt einen ähnlichen Schlepphebel.The document US 6532920 shows a similar rocker arm.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, einen Schlepphebel der vorgenannten Art zu schaffen, bei welchem die zitierten Nachteile mit einfachen Mitteln beseitigt sind.The object of the invention is therefore to provide a drag lever of the aforementioned type, in which the cited disadvantages are eliminated by simple means.

Lösung der AufgabeSolution of the task

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Arme des Außenhebels im Bereich des Endes bei der Komplementärfläche durch einen Querbalken verbunden sind, wobei im Innenhebel eine oberhalb der Komplementärfläche verlaufende, und von dem anderen Ende ausgehende, glattflächige Sackbohrung mit einem darin längs verlagerbaren Schieber als Koppelmittel appliziert ist, welcher Schieber für die Kopplung der Hebel so aus der Sackbohrung verlagerbar ist, daß er abschnittsweise eine als Unterseite ausgebildete Mitnehmerfläche des Querbalkens untergreift, wobei der Innenhebel an seiner Oberseite, bis auf die Gegenlauffläche, weitgehend glattflächig ist und sich von diesem, zumindest weitestgehend fluchtend zu seiner Oberseite auf der Seite seiner Komplementärfläche, wenigstens ein fingerartiges Höhenanschlagmittel für den Außenhebel über den Querbalken hinweg erstreckt und wobei der Innenhebel im Bereich des Endes auf der Seite des Gaswechselventils verschwenkbeweglich mit den Armen des Außenhebels verbunden ist.According to the invention, this object is achieved in that the arms of the outer lever are connected in the region of the end at the complementary surface by a transverse bar, wherein in the inner lever one above the complementary surface extending, and outgoing from the other end, smooth-bore blind bore with a longitudinally displaceable slide is applied as a coupling agent, which slide for the coupling of the lever from the blind bore is displaced so that it partially engages under a trained as a bottom cam surface of the crossbar, wherein the Inner lever on its upper side, to the mating surface, is largely smooth surface and extends from this, at least largely flush with its upper side on the side of its complementary surface, at least one finger-like height stop means for the outer lever on the crossbar away and wherein the inner lever in the region of the end is pivotally connected to the arms of the outer lever on the side of the gas exchange valve.

Somit liegt ein schaltbarer Schlepphebel vor, bei welchem die zitierten Nachteile mit einfachen Mitteln beseitigt sind.Thus, there is a switchable drag lever, in which the cited disadvantages are eliminated by simple means.

Der Schlepphebel baut insgesamt gesehen, auch in seine Hochrichtung, sehr kompakt, so dass bei einer nachträglichen Implementierung in an sich fertige Zylinderköpfe für nichtschaltbare Ventiltriebe hier keine größeren Probleme zu erwarten sind bzw. mehrere Motorenbaureihen bedient werden können.The rocker arm builds overall, even in its vertical direction, very compact, so that in a subsequent implementation in itself finished cylinder heads for non-switchable valve trains here no major problems are to be expected or several engine series can be operated.

Aufgrund des unmittelbar oberhalb der Komplementärfläche für das Abstützelement liegenden Koppelmittels (Schieber) mit seinem Druckraum sind nur sehr kurze Hydraulikpfade vorliegend. Auch wird festgestellt, daß wegen der günstigen Hebelverhältnisse im Kopplungsbereich nur mit einer relativ geringen Bauteilbelastung zu rechnen ist. Die Sackbohrung für das Koppelmittel läßt sich zudem in einem Arbeitsgang einfach herstellen, wobei es besonders vorteilhaft ist, daß der Innenhebel "flach" von diesem ausgehende Höhenanschläge hat. Es kann für den Koppelfall eine hervorragende Lagezuordnung der Sackbohrung zu der Mitnehmerfläche und gleichzeitig eine Verliersicherung dargestellt werden.Due to the immediately above the complementary surface for the support element coupling means (slide) with its pressure chamber only very short hydraulic paths are present. It is also found that due to the favorable leverage ratios in the coupling region is expected only with a relatively low component load. The blind hole for the coupling means can also be easily produced in one operation, it being particularly advantageous that the inner lever has "flat" outgoing from this height stops. It can be shown for the coupling case an excellent position assignment of the blind bore to the driver surface and at the same time a captive.

Der Schieber soll zwar für seinen Koppelfall längs nach außen verlagert werden, denkbar ist es jedoch auch, diesen zur Herstellung einer Kopplung nach innen zu verschieben. Für den Koppelfall greift der Schieber in einfacher Art und Weise vorzugsweise unter eine Unterseite eines in dem Bereich liegenden Querbalkens des Außenhebels. Denkbar ist es jedoch auch, in dem Querbalken eine entsprechende Aussparung für den Schieber vorzusehen.Although the slide is to be displaced longitudinally outwards for its coupling case, it is also conceivable that it may be used for producing a coupling to move in. For the coupling case, the slider engages in a simple manner preferably under a bottom of a lying in the region crossbar of the outer lever. However, it is also conceivable to provide a corresponding recess for the slider in the transverse bar.

Dem Schieber können Stoppmittel zur Begrenzung seiner Kopplungsbewegung am Querbalken gegenüberliegen. So ist eine Hülse in der Sackbohrung vorgesehen, an deren einen Stirnseite der Schieber eine Wegbegrenzung erfährt. Es können jedoch auch nasenartige Ansätze oder Anschläge allgemeiner Art an der Unterseite des Querbalkens vorliegen. Im Falle einer Bohrung o. ä. als Kopplungsfläche im Querbalken kann die Bohrung mit einem Anschlag versehen sein. Hierfür bietet es sich auch an, die Bohrung gestuft auszubilden.The slider may be opposite stop means for limiting its coupling movement on the crossbar. Thus, a sleeve is provided in the blind bore, at one end face of the slider undergoes a travel limit. However, there may also be nose-like projections or attacks of a general nature at the bottom of the crossbar. In the case of a bore o. Ä. As a coupling surface in the crossbar, the bore may be provided with a stop. It also makes sense to train the hole stepped.

Besonders bevorzugt ist es, wenn der Schieber in nur eine Verlagerungsrichtung über den Hydraulikmitteldruck verschoben wird und in seine andere Richtung über die Kraft eines Federmittels wie einer Schraubendruckfeder. Denkbar ist es jedoch auch, diesen in beide Richtungen hydraulisch zu verlagern oder in wenigstens eine Richtung die Kraft eines anderen Servomittels wie beispielsweise eines Elektromagneten, eines Magneten und ähnliches vor- zusehen.It is particularly preferred if the slide is displaced in only one direction of displacement via the hydraulic medium pressure and in its other direction via the force of a spring means such as a helical compression spring. However, it is also conceivable to displace it hydraulically in both directions or to provide the force of another servomechanism such as, for example, an electromagnet, a magnet and the like in at least one direction.

Aufgrund der einteiligen Ausbildung der Ringerweiterung des Schiebers mit dem eigentlichen die Kopplung bewerkstelligenden Abschnitt nach einem weiteren Unteranspruch liegt ein preiswert zu fertigender Schieber vor. Ggf. ist auch eine mehrteilige Ausbildung denkbar.Due to the one-piece design of the ring expansion of the slide with the actual bewerkstelligenden the section coupling section according to another sub-claim is an inexpensive to be produced slider. Possibly. is also a multi-part training conceivable.

Um den Fertigungsaufwand zu minimieren, insbesondere bei einer Blechausbildung, kann die Sackbohrung für den Schieber auch alternativ in einem separaten Einsatzstück appliziert sein. Dieses wird durch dem Fachmann geläufige Verbindungsmaßnahmen mit dem Innenhebel verbunden, so beispielsweise durch Schweißen, Verstemmen, Einpressen oder ähnliches. Eine einteilige Herstellung wird jedoch bevorzugt.In order to minimize the manufacturing effort, especially in a sheet metal training, the blind hole for the slide can also be applied alternatively in a separate insert. This is connected to the inner lever by means familiar with the art connection measures, such as by welding, caulking, press-fitting or the like. However, one-part preparation is preferred.

Anstelle der Schraubendruckfeder für den Schieber sind auch andere druckausübende Mittel wie Tellerfedern, Spiralfedern etc. denkbar. Auch ist ein Einsatz magnetischer Mittel denkbar.Instead of the helical compression spring for the slide and other pressure-exerting means such as disc springs, coil springs, etc. are conceivable. Also, a use of magnetic means is conceivable.

Gemäß einer weiteren Fortbildung der Erfindung ist es vorgeschlagen, von einer Oberseite des Querbalkens im Bereich des Schiebers einen nasenartigen Ansatz ausgehen zu lassen. Aufgrund dieses Ansatzes wird ein unerwünschtes Ausfahren des Schiebers bei der Entkoppelbewegung des Außenhebels über die Oberseite des Querbalkens verhindert.According to a further development of the invention, it is proposed to let go of a top of the crossbar in the region of the slide a nose-like approach. Due to this approach, an undesirable extension of the slide during the decoupling movement of the outer lever is prevented over the top of the crossbar.

Zudem ist es erfindungsgemäß vorgesehen, die Hebel aus einem Leichtbauwerkstoff wie Blech zu fertigen. Dies wirkt sich vorteilhaft auf die Gesamtmasse des Schlepphebels sowie die Fertigungskosten hierfür aus. Denkbar ist jedoch auch eine gießtechnische Ausbildung (Feinguß) des Schlepphebels. Alternativ kann der Schlepphebel auch in einem Metallspritzgußverfahren (MIM - "Metal Injection Moulding) gefertigt werden.In addition, it is inventively provided to manufacture the levers of a lightweight material such as sheet metal. This has an advantageous effect on the total mass of the finger lever and the manufacturing costs for this. It is also conceivable, however, a casting technology training (investment casting) of the finger lever. Alternatively, the drag lever can also be manufactured in a metal injection molding process (MIM - "Metal Injection Molding).

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Erfindung ist zweckmäßigerweise anhand der Zeichnung näher erläutert. Es zeigen:

Figur 1
eine räumliche Ansicht eines erfindungsgemäßen Schlepphebels und
Figur 2
einen Längsschnitt durch den vorgenannten Schlepphebel entlang dessen Längsmittellinie.
The invention is suitably explained in more detail with reference to the drawing. Show it:
FIG. 1
a three-dimensional view of a finger lever according to the invention and
FIG. 2
a longitudinal section through the aforementioned drag lever along the longitudinal center line.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Die Figuren offenbaren einen auf unterschiedliche Nockenhübe umschaltbaren Schlepphebel 1. Dieser besteht aus einem Außenhebel 2, der an einem Ende 9 durch einen Querbalken 15 verbunden ist. Ein Innenhebel 4 liegt zwischen Armen 3 des Außenhebels 2 und ist im Bereich eines weiteren Endes 7 gelenkig mit dem Außenhebel 2 verbunden. Hierfür verläuft der Innenhebel 4 auf einer Achse 32, die axial außen in Bohrungen der Arme 3 des Außenhebels 2 sitzt.The figures disclose a switchable to different cam strokes cam followers 1. This consists of an outer lever 2, which is connected at one end 9 by a crossbar 15. An inner lever 4 is located between arms 3 of the outer lever 2 and is pivotally connected to the outer lever 2 in the region of another end 7. For this purpose, the inner lever 4 extends on an axis 32 which sits axially outside in bores of the arms 3 of the outer lever 2.

Als Lost-Motion-Feder 33 ist eine Drehschenkelfeder vorgesehen, welche die Achse 32 innerhalb des Innenhebels 4 umschließt und mit ihren nicht näher zu erläuternden Armen im Entkoppelfall des Außenhebels 2 vom Innenhebel 4 eine Rückstellbewegung auf den Außenhebel 2 ausübt.As a lost-motion spring 33, a torsion leg spring is provided which surrounds the axis 32 within the inner lever 4 and exerts a return movement to the outer lever 2 with their arms not to be explained in the decoupling of the outer lever 2 from the inner lever.

In etwa im Bereich einer Mitte haben die Arme 3 des Außenhebels 2 an ihrer Oberseite 11 je eine Gegenlauffläche 12 für Großhubnocken. Diese Gegenlauffläche 12 ist als Gleitfläche ausgebildet. Der Innenhebel 4 hingegen besitzt im Bereich dieser Mitte, im Abschnitt seiner Oberseite 13, ebenfalls eine Gegenlauffläche 14 für einen Kleinhubnocken. Diese Gegenlauffläche 14 ist hier als drehbare Rolle dargestellt. Zu erkennen ist zudem, dass der Außenhebel 2 im Bereich des Endes 7 durch einen Querbalken 31 geschlossen ist, so dass er insgesamt gesehen in Draufsicht ein rechteckähnliches Profil bildet.Approximately in the region of a center, the arms 3 of the outer lever 2 at its upper side 11 each have a mating surface 12 for Großhubnocken. This mating surface 12 is formed as a sliding surface. The inner lever 4, however, has in the region of this center, in the section of its upper side 13, also a mating surface 14 for a small stroke cam. This mating surface 14 is shown here as a rotatable roller. It can also be seen that the outer lever 2 is closed in the region of the end 7 by a transverse bar 31, so that it forms a rectangle-like profile as a whole in plan view.

An einer Unterseite 6 (siehe Figur 2) hat der Innenhebel 4 im Bereich des Endes 7 eine Anlage 8 für ein Gaswechselventil. Am gegenüberliegenden Ende 9 ist in die Unterseite 6 des Innenhebels 4 eine Komplementärfläche 10 kalottenförmiger Art eingebracht. Über diese Komplementärfläche 10 liegt der Innen- und somit der gesamte Schlepphebel 4, 1 auf einem Kopf eines zeichnerisch nicht dargestellten Abstützelements auf. Zu erkennen ist auch, dass die Komplementärfläche 10 unterhalb von einem Druckraum 19 liegt, der einenends von einem Grund 16a einer glattflächigen Sackbohrung 16 und anderenends von einer Kolbenfläche 20 einer Ringerweiterung 17a eines Schiebers 17 als Koppelmittel 5 begrenzt ist. Von der Komplementärfläche 10 geht ein Pfad 20a schräg nach hinten in Hebelrichtung aus, welcher den Druckraum 19 schneidet und diesen somit mit Hydraulikmittel versorgt.At a bottom 6 (see FIG. 2 ) has the inner lever 4 in the region of the end 7 a system 8 for a gas exchange valve. At the opposite end 9 a complementary surface 10 dome-shaped type is introduced into the bottom 6 of the inner lever 4. About this complementary surface 10 of the inner and thus the entire drag lever 4, 1 is located on a head of a support member not shown in the drawing. It can also be seen that the complementary surface 10 is located below a pressure chamber 19, the one end of a bottom 16 a of a smooth-bore blind bore 16 and the other end of a piston surface 20 of a ring extension 17 a of a slider 17 as Coupling means 5 is limited. From the complementary surface 10, a path 20a extends obliquely rearwardly in the lever direction, which intersects the pressure chamber 19 and thus supplies it with hydraulic fluid.

Der Schieber 17 besteht aus der genannten Ringerweiterung 17a, die unmittelbar in der Sackbohrung 16 verläuft. An die Ringerweiterung 17a schließt sich in Richtung aus der Sackbohrung 16 heraus ein dünnwandigerer Abschnitt 23 an. Dieser hat axial außen eine Stirnseite 35.The slider 17 consists of said ring extension 17 a, which extends directly in the blind bore 16. At the ring extension 17a is followed in the direction of the blind bore 16 out a thin-walled section 23 at. This has axially outside a front side 35th

Im Bereich des Abschnitts 23 verläuft in der Sackbohrung 16 ein Stoppmittel 18a. Dieses ist hier als dünnwandiger Ring hergestellt, der mit seinem Außenmantel direkt in der Sackbohrung 16 befestigt ist. Fig. 2 zeigt dabei den Anschlagzustand (Kopplung) des Schiebers 17 am Stoppmittel 18a. Somit wird dieses an einem weiteren unerwünschten Ausfahren gehindert.In the region of the section 23, a stop means 18a extends in the blind bore 16. This is made here as a thin-walled ring, which is fastened with its outer jacket directly in the blind bore 16. Fig. 2 shows the stop state (coupling) of the slider 17 at the stop means 18a. Thus, this is prevented from further unwanted extension.

Zu erkennen ist zudem, daß der Abschnitt 23 von einem Federmittel 22 umschlossen ist. Dieses stützt sich axial innen an der Ringerweiterung 17a ab. Axial außen erfährt das Federmittel 22 eine Anlage an einer Hülse 24, welche direkt von dem Abschnitt 23 durchragt ist und mit ihrem Außenmantel in einer Bohrung des Stoppmittels 18a verläuft.It can also be seen that the section 23 is enclosed by a spring means 22. This is supported axially on the inside of the ring extension 17a. Axially outward, the spring means 22 experiences a contact with a sleeve 24, which is directly penetrated by the portion 23 and extends with its outer jacket in a bore of the stop means 18a.

Figur 2 zeigt den Koppelzustand des Außenhebels 2 mit dem Innenhebel 4. Sollen beide Hebel 2, 4 bei einem Grundkreisdurchlauf der beaufschlagenden Nocken entkoppelt werden, so wird der Druckraum 19 derartig von Hydraulikmitteldruck entlastet, dass der Schieber 17 über die Kraft seines Federmittels 22 axial nach innen in die Sackbohrung 16 einfährt. Er untergreift somit nicht mehr eine Mitnehmerfläche 18 des Querbalkens 15 des Außenhebels 2. Somit folgt der Schlepphebel 1 lediglich dem Hub des den Innenhebel 4 beaufschlagenden Kleinhubnockens. Der Außenhebel 2 vollzieht eine Lehrhubbewegung gegenüber dem Innenhebel 4. Eine Kopplung des Schiebers 17 erfolgt in dem Fachmann geläufiger Art und Weise über Hydraulikmitteldruck entgegen der Kraft des Federmittels 22. FIG. 2 shows the coupling state of the outer lever 2 with the inner lever 4. If both levers 2, 4 are decoupled at a Grundkreisdurchlauf the acting cams, the pressure chamber 19 is relieved of hydraulic fluid pressure that the slider 17 via the force of its spring means 22 axially inwards the blind bore 16 retracts. He thus no longer engages under a driver surface 18 of the crossbar 15 of the outer lever 2. Thus follows the drag lever 1 only the stroke of the inner lever 4 acting small lift cam. The outer lever 2 performs a Lehrhubbewegung relative to the inner lever 4. A coupling of the slider 17 is carried out in a manner familiar to those skilled in the art via hydraulic fluid pressure against the force of the spring means 22nd

Wie aus Figur 1 hervorgeht, ist es des Weiteren vorgesehen, an der Oberseite 13 des Innenhebels 4 im Bereich des Endes 9 zwei die Arme 27 des Innenhebels 4 verlängernde Höhenanschlagmittel 34 anzuordnen. Diese gehen hier fluchtend als "glatte" Verlängerungen der Oberseite 13 in Richtung zum Ende 9 und sind als Finger ausgebildet. Sie ragen über eine Oberseite 38 des Querbalkens 15 des Außenhebels 2. Somit erfährt der Außenhebel 2 bei seiner Rückschwenkbewegung aus dem abgekoppelten Zustand heraus eine hervorragende Lagefixierung gegenüber dem Innenhebel 4. Der Schieber 17 kann im Bedarfsfall "punktgenau" die Mitnehmerfläche 18 des Außenhebels 2 untergreifen.How out FIG. 1 it is further provided, on the upper side 13 of the inner lever 4 in the region of the end 9 to arrange two arms 27 of the inner lever 4 extending height stop means 34. These go here in alignment as "smooth" extensions of the top 13 in the direction of the end 9 and are designed as fingers. They protrude over an upper side 38 of the crossbar 15 of the outer lever 2. Thus, the outer lever 2 undergoes an excellent positional fixation with respect to the inner lever 4 in its return pivoting movement from the uncoupled state. The slide 17 can "pinpoint" the driving surface 18 of the outer lever 2 engage if necessary ,

Wie zudem zu erkennen ist, geht von der Oberseite 38 des Querbalkens 15 ein nasenartiger Ansatz 37 aus. Bei der Abschwenkbewegung des Außenhebels 2 im Entkoppelfall liegt somit die äußere Stirnseite 35 des Schiebers 17 stets einer Innenseite 36 des Ansatzes 37 resp. Querbalkens 15 gegenüber. Ein unerwünschtes Ausfahren des Schiebers 17 über die Oberseite 38 des Querbalkens 15 ist somit verhindert.As can also be seen, starting from the upper side 38 of the crossbar 15 is a nose-like projection 37. In the Abschwenkbewegung of the outer lever 2 in the decoupling case thus the outer end face 35 of the slider 17 is always an inner side 36 of the projection 37, respectively. Crossbar 15 opposite. An undesirable extension of the slide 17 on the top 38 of the crossbar 15 is thus prevented.

Liste der BezugszahlenList of reference numbers

11
Schlepphebelcam follower
22
Außenhebelexternal lever
33
Armpoor
44
Innenhebelinternal lever
55
Koppelmittelcoupling means
66
Unterseitebottom
77
EndeThe End
88th
Anlageinvestment
99
EndeThe End
1010
Komplementärflächecomplementary surface
1111
Oberseitetop
1212
GegenlaufflächeMating surface
1313
Oberseitetop
1414
GegenlaufflächeMating surface
1515
Querbalkencrossbeam
1616
Sackbohrungblind hole
16a16a
Grundreason
1717
Schieberpusher
17a17a
RingenweiterungRingenweiterung
1818
Mitnehmerflächeentraining
18a18a
Stoppmittelstop means
1919
Druckraumpressure chamber
2020
Kolbenflächepiston area
20a20a
Pfadpath
2121
nicht vergebennot forgiven
2222
Federmittelspring means
2323
Abschnittsection
2424
Hülseshell
2525
nicht vergebennot forgiven
2626
nicht vergebennot forgiven
2727
Armpoor
2828
Querabschnittcross section
2929
Aussparungrecess
3030
nicht vergebennot forgiven
3131
Querbalkencrossbeam
3232
Achseaxis
3333
Lost-Motion-FederLost-motion spring
3434
HöhenanschlagmittelHeight slings
3535
Stirnseitefront
3636
Innenseiteinside
3737
Ansatzapproach
3838
Oberseitetop

Claims (13)

  1. Rocker arm (1) of a valve drive of an internal combustion engine, which rocker arm (1) can be switched to different lifts for at least one gas exchange valve, having an outer lever (2) and having an inner lever (4) which runs between the arms (3) of said outer lever (2), with the two levers (2, 4) being pivotable relative to one another and with it being possible for the two levers (2, 4) to be coupled to one another by coupling means (5), such that in the coupled state a large valve lift is generated and in the decoupled state a small or zero valve lift is generated, with a contact surface (8) for a gas exchange valve being formed on an underside (6) of the rocker arm (1) at one end (7) and with a complementary surface (10) for a support element being formed on an underside (6) of the rocker arm (1) at the other end (9), and with the inner lever (4) being pivotably connected to the arms (3) of the outer lever (2) in the region of the end (7) on the side of the gas exchange valve, characterized in that at least one mating running surface (12) for a large-lift cam is provided on an upper side (11) of the outer lever (2) and a mating running surface (14) for a small-lift or zero-lift cam is provided on an upper side (13) of the inner lever (4), and with the arms (3) of the outer lever (2) being connected in the region of the end (9) at the complementary surface (10) by means of a transverse beam (15), with the inner lever (4) having formed in it a smooth-surfaced blind bore (16) which runs above the complementary surface (10) and which extends from the other end (9) and which has a slide (17), which is movable longitudinally therein, as a coupling means (5), which slide (17), in order to couple the levers (2, 4), can be moved out of the blind bore (16) in such a way as to engage in sections under a driver surface (18), which is formed as an underside, of the transverse beam (15), with the inner lever (4) having a substantially smooth surface on its upper side (13) with the exception of the mating running surface (14), and with at least one finger-like height stop means (34) for the outer lever (2) extending from said inner lever (4), at least substantially in alignment with its upper surface (13) and on the side of its complementary surface (10), beyond the transverse beam (15).
  2. Rocker arm according to Claim 1, characterized in that the slide (17) can be moved in its coupling direction by means of the force of hydraulic medium, with a pressure chamber (19) for the hydraulic medium being formed for this purpose in the blind bore (16), which pressure chamber (19) is delimited axially at one side by a base (16a) of the blind bore (16) and at the other side by a piston surface (20) of an annular enlargement (17a) of the slide (17), with it being possible for hydraulic medium to be supplied to the pressure chamber (19) by a path (20a) extending from the complementary surface (10).
  3. Rocker arm according to Claim 2, characterized in that a movement of the slide (17) in the decoupling direction into the blind bore (16) is realized by means of the force of a spring means (22) such as a helical pressure spring, which spring means (22) surrounds the slide (17) in its section (23) axially behind its annular enlargement (17a), and which spring means (22) acts at one end against the annular enlargement (17a) and at the other end against a sleeve (24), which is fastened at least indirectly in the blind bore (16), on the side of the end (9).
  4. Rocker arm according to Claim 3, characterized in that the annular enlargement (17a) of the slide (17) is integrally connected to the latter.
  5. Rocker arm according to Claim 3, characterized in that stop means (18a) for limiting the travel of the slide (17) out of the blind bore (16) are provided in the blind bore (16).
  6. Rocker arm according to Claim 5, characterized in that the stop means (18a) comprise an annular part which is fastened in the bore (16) and through which the section (23) of the slide (17) extends.
  7. Rocker arm according to Claim 1, characterized in that the inner lever (4) has two arms (27) which run substantially parallel to the arms (3) of the outer lever (2), with the blind bore (16) being formed in a transverse section (28) which connects the arms (27) and which is formed in one piece with the inner lever (4).
  8. Rocker arm according to Claim 1, characterized in that the inner lever (4) has two arms (27) which run approximately parallel to the arms (3) of the outer lever, with the blind bore (16) being formed in a separate transverse section (28) which connects the arms (27).
  9. Rocker arm according to Claim 8, characterized in that the separate transverse section (28) is connected to the inner lever (4) by means of a fastening process such as welding or press fitting, and is optionally produced by extrusion.
  10. Rocker arm according to Claim 1, characterized in that a lug-like projection (37) extends from an upper side (38) of the transverse beam (15), which projection (37) has a height such that, over an entire decoupling travel of the outer lever (2) from the inner lever (4), an outer end side (35) of the slide (17) is situated opposite an inner side (36) of the projection (37).
  11. Rocker arm according to Claim 1, characterized in that at least one of the levers (2, 4) is composed at least substantially of a lightweight material such as sheet metal which is or can be deep-drawn or of plastic or fibre-reinforced plastic.
  12. Rocker arm according to Claim 1, characterized in that at least one of the levers (2, 4) is composed at least substantially of a precision-cast part.
  13. Rocker arm according to Claim 1, characterized in that at least one of the levers (2, 4) is produced at least substantially in a metal injection moulding (MIM) process.
EP04759598A 2003-04-23 2004-03-09 Rocker arm of a valve gear of a combustion engine Expired - Lifetime EP1616082B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10318295A DE10318295A1 (en) 2003-04-23 2003-04-23 Drag lever of a valve train of an internal combustion engine
PCT/EP2004/002369 WO2004094791A1 (en) 2003-04-23 2004-03-09 Rocker arm of a valve gear of a combustion engine

Publications (2)

Publication Number Publication Date
EP1616082A1 EP1616082A1 (en) 2006-01-18
EP1616082B1 true EP1616082B1 (en) 2010-11-10

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ID=33154347

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EP04759598A Expired - Lifetime EP1616082B1 (en) 2003-04-23 2004-03-09 Rocker arm of a valve gear of a combustion engine

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US (1) US7328675B2 (en)
EP (1) EP1616082B1 (en)
AT (1) ATE487852T1 (en)
DE (2) DE10318295A1 (en)
WO (1) WO2004094791A1 (en)

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Also Published As

Publication number Publication date
WO2004094791A1 (en) 2004-11-04
US7328675B2 (en) 2008-02-12
EP1616082A1 (en) 2006-01-18
DE502004011872D1 (en) 2010-12-23
US20070006837A1 (en) 2007-01-11
DE10318295A1 (en) 2004-11-11
ATE487852T1 (en) 2010-11-15

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