EP1785595A1 - Switchable rocker arm of a valve train of an internal combustion engine - Google Patents

Switchable rocker arm of a valve train of an internal combustion engine Download PDF

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Publication number
EP1785595A1
EP1785595A1 EP06122627A EP06122627A EP1785595A1 EP 1785595 A1 EP1785595 A1 EP 1785595A1 EP 06122627 A EP06122627 A EP 06122627A EP 06122627 A EP06122627 A EP 06122627A EP 1785595 A1 EP1785595 A1 EP 1785595A1
Authority
EP
European Patent Office
Prior art keywords
lever
arms
coupling means
drag
inner lever
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
EP06122627A
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German (de)
French (fr)
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EP1785595B1 (en
Inventor
Joachim Seitz
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IHO Holding GmbH and Co KG
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Schaeffler KG
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Publication date
Application filed by Schaeffler KG filed Critical Schaeffler KG
Publication of EP1785595A1 publication Critical patent/EP1785595A1/en
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Publication of EP1785595B1 publication Critical patent/EP1785595B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • F01L13/0005—Deactivating valves
    • 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
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets
    • 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
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an inner and a surrounding this with its arms outer lever, the lever pivotally movable relative to each other on a common axis and coupling means are connected to each other in such a way that when coupling a large and at Decoupling a small or 0-valve stroke is generated, wherein the inner lever at one end at one end a system for a gas exchange valve and at the other end a complementary surface for a support element and the outer lever on each arm a contact surface for a quasihubnocken and the inner lever a contact surface for has a small or 0-lift cam and wherein between the levers a lost-motion spring is provided.
  • Such a drag lever goes out of the class considered as generic DE 103 10 226 A1 out.
  • This has at an immediate valve-side end a connection axis on which the lever parts are mounted pivotably relative to each other.
  • a longitudinally displaceable coupling means is provided in the inner lever, in the area above a complementary surface for storage on a head of a support element, which is displaceable for a coupling case under a crossbar, the arms of the outer lever connects end.
  • the object of the invention is therefore to provide a drag lever of the aforementioned type, in which the cited disadvantages are eliminated.
  • a drag lever is to be created, which is optimized in terms of its moment of inertia and the deflection.
  • this object is achieved in that the axis, seen in the longitudinal direction of the finger lever, is disposed between the complementary surface for the support element and the contact surfaces for the lift cams, wherein the arms of the outer lever terminate at one end immediately after their contact surfaces in end faces and wherein the Inner lever, at least with an area whose system for the gas exchange valve, longitudinally beyond the end faces of the arms of the outer lever also stands.
  • a lost-motion spring at least one rotary leg spring, which is expediently clamped on the axis between an arm of the outer lever and the inner lever.
  • two lost-motion springs are provided which extend within the arms of the outer lever.
  • it is intended to other lost-motion springs such as helical compression springs or the like, which act between the levers. Due to the use of rotary torsion springs is a switchable drag lever, which in particular does not build high and has a compact design.
  • the proposed slide (piston) above the complementary surface in the inner lever as a coupling means can be very easily displaced in at least one direction by means of hydraulic medium which can be led out of the head of the support element and a short channel.
  • a provision can be made via the force of a mechanical spring means such as a helical compression or helical tension spring.
  • Other coupling means such as slide packages, balls, wedges, etc. may be provided.
  • an alternative imposition such as a magnetic, electromagnetic, etc. is thought.
  • the outer lever forms a box or U-profile and is connected at one end by the crossbar.
  • the crossbeam stabilizes on the one hand the outer lever, on the other hand it serves with its top as an excellent stop surface for the coupling agent.
  • a stop is provided. This can either be formed as an end of the inner lever at the other end outgoing approach that communicates with an underside of the crossbar.
  • the arms of the outer lever in the region of a transverse center plane of the finger lever by a crossbar on be connected to the bottom on which the inner lever strikes with a lower surface.
  • an aligned assignment of the coupling means is created to its corresponding counter surface. It is clear that in this area, a low coupling play must be provided. This can be created by varying a height of the complementary surface on the crossbar or the height of the cross-girder crosswise below. Possibly. appropriate voting enclosures may be set up in these areas.
  • At least one of the levers should consist of a lightweight material such as sheet metal.
  • a lightweight material such as sheet metal.
  • the rocker arm if it consists of sheet material, to be represented with its essential components in a stamping bending process in mass production.
  • the region of the inner lever with the complementary surface at the other end may be provided separately between the side walls of the inner lever. However, a separate arrangement is provided behind a corresponding end-side end face of the inner lever. Alternatively, the region of the complementary surface with the corresponding receptacle for the coupling means can also experience a one-piece design with the inner lever.
  • a rotatable roller In concretization of the invention as a contact surface in the inner lever a rotatable roller and are provided as contact surfaces on the outer lever sliding surfaces.
  • all contact surfaces are provided with rotatable rollers or all contact surfaces only with sliding surfaces or that the contact surfaces on the outer lever are rotatable rollers and the contact surface is formed on the inner lever by a sliding surface.
  • the figures disclose a switchable drag lever 1 of a valve train of an internal combustion engine.
  • This consists of a U-like in plan view, thin-walled outer lever 4, between the arms 2, a bar-like inner lever 3 is received with its side walls 19.
  • the levers 3, 4 extend on a common axis 5 relative to each other pivotally.
  • the axis 5 is in the range of a transverse center plane of the finger lever.
  • the inner lever 3 has at one end 8 at a bottom 7 a system 9 for at least one gas exchange valve. At the other end 10, the inner lever 3 at the bottom 7 has a complementary surface 11 for mounting on a head of a support element. At the same time it can be seen that above the complementary surface 11, a longitudinally displaceable slide is positioned as coupling means 6. This can be moved via hydraulic means in its coupling position. The latter can be conducted via a direct channel 27 from the head of the support element in front of an inner end of the coupling means 6.
  • the coupling means 6 is hydraulically extended in sections from the inner lever 3, for which a crossbar 16 at the other end 10, which connects the arms 2 of the outer lever 4, on its upper side 18 has a complementary surface 17.
  • the inner lever 3 has in this transverse region between its side walls 19 a rotatable and preferably roller bearing roller, which serves as a contact surface 13, for example, for a low-lift cam.
  • the axis 5 is provided with two lost-motion springs 14, which are designed here as torsion torsion springs. These springs 14 extend axially between the arms 2 of the outer lever 4 and the arms 19 of the inner lever 3. To create the appropriate space, the arms 2 of the outer lever 4 are formed in this area box-like.
  • a crossbar 26 may be used, which connects the arms 2 of the outer lever 4 approximately in the region of a transverse center plane of the finger lever 1, the inner lever 3 under cross-connects.
  • the inner lever 3 come into contact with a suitable region of its underside 7 on an upper side of the crossbar 26.
  • a reduction in the mass moment of inertia of the entire finger lever 1 can be achieved around this pivot point, which can lead to an increase in the maximum speed in the coupled state of the finger lever 1.
  • the mass moment of inertia of the outer lever 4 is reduced about the axis 5 in the decoupled state.
  • the outer lever 4 no longer experiences the relatively high deflection in the coupling state when cam is applied as in the cited prior art.
  • the outer lever 4 may be dimensioned weaker.

Abstract

Two levers (3,4) run on a common shaft (5) so as to swivel relative to one another. The shaft is arranged between the complementary face (11) for a support and the lifting faces (12,13) for the lifting cams when viewed from a longitudinal direction of the valve rocker lever (1). The arms (2) of the outer lever at one end (8) terminate in end faces (15) directly after their lifting faces and the inner lever. The area of a seating face of the inner lever protrudes beyond the end faces of the arms of the outer lever.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen schaltbaren Schlepphebel eines Ventiltriebs einer Brennkraftmaschine, mit einem Innen- und einem diesen mit seinen Armen umschließenden Außenhebel, wobei die Hebel auf einer gemeinsamen Achse relativ zueinander verschwenkbeweglich verlaufen und über Koppelmittel derartig miteinander verbindbar sind, dass bei Kopplung ein großer und bei Entkopplung ein kleiner oder 0-Ventilhub generiert ist, wobei der Innenhebel an einer Unterseite an einem Ende eine Anlage für ein Gaswechselventil und am anderen Ende eine Komplementärfläche für ein Abstützelement sowie der Außenhebel auf jedem Arm eine Anlauffläche für einen Großhubnocken und der Innenhebel eine Anlauffläche für einen Klein- oder 0-Hubnocken besitzt und wobei zwischen den Hebeln eine Lost-Motion-Feder vorgesehen ist.The invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an inner and a surrounding this with its arms outer lever, the lever pivotally movable relative to each other on a common axis and coupling means are connected to each other in such a way that when coupling a large and at Decoupling a small or 0-valve stroke is generated, wherein the inner lever at one end at one end a system for a gas exchange valve and at the other end a complementary surface for a support element and the outer lever on each arm a contact surface for a Großhubnocken and the inner lever a contact surface for has a small or 0-lift cam and wherein between the levers a lost-motion spring is provided.

Hintergrund der ErfindungBackground of the invention

Ein derartiger Schlepphebel geht aus der als gattungsbildend betrachteten DE 103 10 226 A1 hervor. Dieser hat an einem unmittelbaren ventilseitigen Ende eine Verbindungsachse, auf dem die Hebelteile relativ zueinander verschwenkbeweglich gelagert sind. Am anderen Ende ist im Innenhebel, im Bereich oberhalb einer Komplementärfläche zur Lagerung auf einem Kopf eines Abstützelements, ein längs verlagerbares Koppelmittel (Kolben) vorgesehen, das für einen Koppelfall unter einen Querbügel verlagerbar ist, der Arme des Außenhebels endseitig verbindet.Such a drag lever goes out of the class considered as generic DE 103 10 226 A1 out. This has at an immediate valve-side end a connection axis on which the lever parts are mounted pivotably relative to each other. At the other end, a longitudinally displaceable coupling means (piston) is provided in the inner lever, in the area above a complementary surface for storage on a head of a support element, which is displaceable for a coupling case under a crossbar, the arms of the outer lever connects end.

Auffällig ist, dass die Achse relativ weit vom Schwenkpunkt des gesamten Hebels entfernt liegt. Somit hat der Schlepphebel insgesamt ein unnötig hohes Massenträgheitsmoment um diesen Punkt. Gleichfalls liegt auf der Hand, dass auch der Außenhebel im entkoppelten Zustand wegen der weit am einen Ende liegenden Achse ein unnötig hohes Massenträgheitsmoment besitzt. Auch findet am Außenhebel bei dessen Kopplung eine unnötig große Durchbiegung bei Nockenbeaufschlagung statt, die durch entsprechende Versteifungsmaßnahmen gegengehalten werden muss. Zudem ist festzustellen, dass der Hebel insgesamt relativ breit baut, so dass es hier zu Einbauproblemen kommen kann.It is noticeable that the axis is located relatively far from the pivot point of the entire lever. Thus, the rocker arm has an unnecessarily high mass moment of inertia around this point. Likewise, it is obvious that the outer lever in the decoupled state has an unnecessarily high moment of inertia because of the axis lying far at one end. Also takes place on the outer lever in the coupling an unnecessarily large deflection in cam loading, which must be countered by appropriate stiffening measures. In addition, it should be noted that the lever as a whole builds relatively wide, so that it can come here to installation problems.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, einen Schlepphebel der vorgenannten Art zu schaffen, bei dem die zitierten Nachteile beseitigt sind. Insbesondere soll ein Schlepphebel geschaffen werden, der hinsichtlich seines Massenträgheitsmoments und der Durchbiegung optimiert ist.The object of the invention is therefore to provide a drag lever of the aforementioned type, in which the cited disadvantages are eliminated. In particular, a drag lever is to be created, which is optimized in terms of its moment of inertia and the deflection.

Lösung der AufgabeSolution of the task

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Achse, in Längsrichtung des Schlepphebels gesehen, zwischen der Komplementärfläche für das Abstützelement und den Anlaufflächen für die Hubnocken angeordnet ist, wobei die Arme des Außenhebels am einen Ende unmittelbar nach deren Anlaufflächen in Stirnseiten enden und wobei der Innenhebel, zumindest mit einem Bereich dessen Anlage für das Gaswechselventil, längs über die Stirnseiten der Arme des Außenhebels hinaus steht.According to the invention, this object is achieved in that the axis, seen in the longitudinal direction of the finger lever, is disposed between the complementary surface for the support element and the contact surfaces for the lift cams, wherein the arms of the outer lever terminate at one end immediately after their contact surfaces in end faces and wherein the Inner lever, at least with an area whose system for the gas exchange valve, longitudinally beyond the end faces of the arms of the outer lever also stands.

Somit sind die eingangs zitierten Nachteile wirkungsvoll beseitigt. Insbesondere ist an einen schaltbaren Schlepphebel mit Längsverriegelung gedacht, bei dem ein schieberartiges Koppelmittel oberhalb der Komplementärfläche für das Abstützelement im Innenhebel verläuft und längs mit einem Querbalken des Außenhebels am anderen Ende in Eingriff bringbar ist. Ggf. ist jedoch auch ein Schlepphebel mit Querverriegelung vorgesehen.Thus, the disadvantages cited above are effectively eliminated. In particular, thought of a switchable rocker arm with longitudinal locking, in which a slider-like coupling means extends above the complementary surface for the support element in the inner lever and longitudinally engageable with a crossbar of the outer lever at the other end. Possibly. However, a drag lever with transverse locking is provided.

Im Vergleich zum beschreibungseinleitend zitierten Stand der Technik ist nunmehr die Achse deutlich vom einen Ende in Richtung zur Quermittelebene des schaltbaren Schlepphebels verlagert. Somit ist im gekoppelten Zustand mit einer Reduzierung des Massenträgheitsmoments um den Schwenkpunkt (Komplementärfläche) zu rechnen. Hierdurch können ggf. größere Maximaldrehzahlen gefahren werden. Gleichzeitig führt die Verlagerung der Achse in Richtung zur Hebelmitte auch zu einer Verringerung des Massenträgheitsmoments des Außenhebels um die Achse im Entkoppelzustand. Somit können auch in diesem Entkoppelzustand ggf. höhere Drehzahlen gefahren werden.In comparison to the introductory cited prior art, the axis is now clearly shifted from one end in the direction of the transverse center plane of the switchable rocker arm. Thus, in the coupled state with a reduction of the moment of inertia around the pivot point (complementary surface) to be expected. As a result, larger maximum speeds may possibly be driven. At the same time, the displacement of the axis in the direction of the lever center also leads to a reduction of the moment of inertia of the outer lever about the axis in the decoupling state. Thus, in this decoupling state possibly higher speeds can be driven.

Gleichzeitig ist die eingangs zitierte Durchbiegung des Außenhebels bei Nockenkontakt und Kopplung verringert, so dass der Schlepphebel schwächer dimensioniert werden kann.At the same time the above-cited deflection of the outer lever is reduced in cam contact and coupling, so that the drag lever can be dimensioned weaker.

Die Arme des Außenhebels enden erfindungsgemäß unmittelbar nach den Anlaufflächen für die respektiven Großhubnocken, so dass in diesem Bereich einerseits Material gespart ist und andererseits zumindest an dem einen ventilseitigen Ende lateraler Bauraum vorliegt.The arms of the outer lever end according to the invention immediately after the contact surfaces for the respective Großhubnocken, so that in this area on the one hand Material is saved and on the other hand present at least at the one valve-side end lateral space.

In Konkretisierung der Erfindung ist es vorgeschlagen, als Lost-Motion-Feder wenigstens eine Drehschenkelfeder vorzusehen, die zweckmäßigerweise auf der Achse zwischen einem Arm des Außenhebels und dem Innenhebel eingespannt ist. Vorzugsweise sind zwei Lost-Motion-Federn vorgesehen, die innerhalb der Arme des Außenhebels verlaufen. Alternativ ist auch an andere Lost-Motion-Federn wie Schraubendruckfedern oder dergleichen gedacht, die zwischen den Hebeln wirken. Aufgrund des Einsatzes der Drehschenkelfedern liegt ein schaltbarer Schlepphebel vor, der insbesondere nicht hoch baut und eine kompakte Bauform besitzt.In concretization of the invention, it is proposed to provide as a lost-motion spring at least one rotary leg spring, which is expediently clamped on the axis between an arm of the outer lever and the inner lever. Preferably, two lost-motion springs are provided which extend within the arms of the outer lever. Alternatively, it is intended to other lost-motion springs such as helical compression springs or the like, which act between the levers. Due to the use of rotary torsion springs is a switchable drag lever, which in particular does not build high and has a compact design.

Der vorgeschlagene Schieber (Kolben) oberhalb der Komplementärfläche im Innenhebel als Koppelmittel lässt sich sehr einfach über aus dem Kopf des Abstützelements und einen kurzen Kanal heranleitbares Hydraulikmittel in wenigstens eine Richtung verlagern. In die andere Richtung kann eine Rückstellung über die Kraft eines mechanischen Federmittels wie einer Schraubendruck-oder Schraubenzugfeder erfolgen. Ggf. können auch andere Koppelmittel wie Schieberpakete, Kugeln, Keile etc. vorgesehen sein. Auch ist an eine alternative Beaufschlagung wie eine magnetische, elektromagnetische etc. gedacht.The proposed slide (piston) above the complementary surface in the inner lever as a coupling means can be very easily displaced in at least one direction by means of hydraulic medium which can be led out of the head of the support element and a short channel. In the other direction, a provision can be made via the force of a mechanical spring means such as a helical compression or helical tension spring. Possibly. Other coupling means such as slide packages, balls, wedges, etc. may be provided. Also, an alternative imposition such as a magnetic, electromagnetic, etc. is thought.

In Draufsicht bildet der Außenhebel ein Kasten- oder U-Profil und ist am einen Ende durch den Querbalken verbunden. Der Querbalken stabilisiert zum einen den Außenhebel, zum anderen dient er mit seiner Oberseite als hervorragende Anschlagfläche für das Koppelmittel.In plan view, the outer lever forms a box or U-profile and is connected at one end by the crossbar. The crossbeam stabilizes on the one hand the outer lever, on the other hand it serves with its top as an excellent stop surface for the coupling agent.

Zur Darstellung einer fluchtenden Zuordnung des Koppelmittels zu der Komplementärfläche an der Oberseite des Querbalkens ist ein Anschlag vorgesehen. Dieser kann entweder als von einer Stirnfläche des Innenhebels am anderen Ende ausgehender Ansatz ausgebildet sein, der mit einer Unterseite des Querbalkens kommuniziert. Alternativ können die Arme des Außenhebels im Bereich einer Quermittelebene des Schlepphebels durch einen Querbalken an der Unterseite verbunden sein, auf dem der Innenhebel mit einer Unterfläche anschlägt. Somit ist im Nockengrundkreis eine fluchtende Zuordnung des Koppelmittels zu seiner entsprechenden Gegenfläche geschaffen. Klar ist, dass in diesem Bereich auch ein geringes Koppelspiel vorgesehen sein muss. Dieses kann über Variation einer Höhe der Komplementärfläche am Querbalken oder der Höhe des mittig untergreifenden Querbalkens geschaffen werden. Ggf. können in diesen Bereichen geeignete Abstimmbeilagen aufgelegt werden.To illustrate an alignment of the coupling means to the complementary surface at the top of the crossbar a stop is provided. This can either be formed as an end of the inner lever at the other end outgoing approach that communicates with an underside of the crossbar. Alternatively, the arms of the outer lever in the region of a transverse center plane of the finger lever by a crossbar on be connected to the bottom on which the inner lever strikes with a lower surface. Thus, in the cam base circle an aligned assignment of the coupling means is created to its corresponding counter surface. It is clear that in this area, a low coupling play must be provided. This can be created by varying a height of the complementary surface on the crossbar or the height of the cross-girder crosswise below. Possibly. appropriate voting enclosures may be set up in these areas.

Gemäß einer zweckmäßigen Fortbildung der Erfindung soll wenigstens eines der Hebel (Außen- oder Innenhebel) aus einem Leichtbauwerkstoff wie Blech bestehen. Dies wirkt sich günstig auf die Fertigungskosten und die Masse des Schlepphebels aus. Vorzugsweise soll der Schlepphebel, sofern er aus Blechwerkstoff besteht, mit seinen wesentlichen Bauteilen in einem Stanz- Biegeprozess in Massenfertigung dargestellt werden.According to an expedient development of the invention, at least one of the levers (outer or inner lever) should consist of a lightweight material such as sheet metal. This has a favorable effect on the manufacturing costs and the mass of the finger lever. Preferably, the rocker arm, if it consists of sheet material, to be represented with its essential components in a stamping bending process in mass production.

Der Bereich des Innenhebels mit der Komplementärfläche am anderen Ende kann zwischen den Seitenwänden des Innenhebels separat vorgesehen sein. Jedoch ist auch eine separate Anordnung hinter einer entsprechenden endseitigen Stirnfläche des Innenhebels vorgesehen. Alternativ hierzu kann der Bereich der Komplementärfläche mit der entsprechenden Aufnahme für das Koppelmittel auch eine einteilige Ausbildung mit dem Innenhebel erfahren.The region of the inner lever with the complementary surface at the other end may be provided separately between the side walls of the inner lever. However, a separate arrangement is provided behind a corresponding end-side end face of the inner lever. Alternatively, the region of the complementary surface with the corresponding receptacle for the coupling means can also experience a one-piece design with the inner lever.

In Konkretisierung der Erfindung ist als Anlauffläche im Innenhebel eine drehbare Rolle und sind als Anlaufflächen am Außenhebel Gleitflächen vorgesehen. Somit hat nur der Bereich, welcher statistisch bzw. empirisch gesehen den häufigsten Nockenkontakt hat, die aufwändigere Drehverbindung. Es kann jedoch auch zweckmäßig und vorgesehen sein, dass sämtliche Anlaufflächen mit drehbaren Rollen bzw. sämtliche Anlaufflächen lediglich mit Gleitflächen versehen sind oder dass die Anlaufflächen am Außenhebel drehbare Rollen sind und die Anlauffläche am Innenhebel durch eine Gleitfläche gebildet ist.In concretization of the invention as a contact surface in the inner lever a rotatable roller and are provided as contact surfaces on the outer lever sliding surfaces. Thus, only the area that statistically or empirically has the most frequent cam contact, the more complex rotary joint. However, it may also be expedient and provided that all contact surfaces are provided with rotatable rollers or all contact surfaces only with sliding surfaces or that the contact surfaces on the outer lever are rotatable rollers and the contact surface is formed on the inner lever by a sliding surface.

Kurze Beschreibung der ZeichnungShort description of the drawing

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

Figur 1
in einer räumlichen Ansicht den erfindungsgemäßen Schlepphebel und die
Figur 2
einen Schnitt entlang der Längsmittelebene des Schlepphebels.
The invention is suitably explained in more detail with reference to the drawing. Show it:
FIG. 1
in a three-dimensional view of the rocker arm and the invention
FIG. 2
a section along the longitudinal center plane of the finger lever.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Die Figuren offenbaren einen schaltbaren Schlepphebel 1 eines Ventiltriebs einer Brennkraftmaschine. Dieser besteht aus einem in Draufsicht U-ähnlichen, dünnwandigen Außenhebel 4, zwischen dessen Armen 2 ein balkenartiger Innenhebel 3 mit seinen Seitenwänden 19 aufgenommen ist. Die Hebel 3, 4 verlaufen auf einer gemeinsamen Achse 5 relativ verschwenkbeweglich zueinander. Die Achse 5 liegt im Bereich einer Quermittelebene des Schlepphebels 1.The figures disclose a switchable drag lever 1 of a valve train of an internal combustion engine. This consists of a U-like in plan view, thin-walled outer lever 4, between the arms 2, a bar-like inner lever 3 is received with its side walls 19. The levers 3, 4 extend on a common axis 5 relative to each other pivotally. The axis 5 is in the range of a transverse center plane of the finger lever. 1

Der Innenhebel 3 hat an einem Ende 8 an einer Unterseite 7 eine Anlage 9 für wenigstens ein Gaswechselventil. Am anderen Ende 10 hat der Innenhebel 3 an der Unterseite 7 eine Komplementärfläche 11 zur Lagerung auf einem Kopf eines Abstützelements. Gleichzeitig ist zu erkennen, dass oberhalb der Komplementärfläche 11 ein längs verlagerbarer Schieber als Koppelmittel 6 positioniert ist. Dieser kann über Hydraulikmittel in seine Koppelposition verlagert werden. Letzteres ist über einen direkten Kanal 27 aus dem Kopf des Abstützelements vor eine Innenstirn des Koppelmittels 6 leitbar. Für einen gewünschten Koppelfall wird das Koppelmittel 6 hydraulisch abschnittsweise aus dem Innenhebel 3 ausgefahren, wofür ein Querbalken 16 am anderen Ende 10, welcher die Arme 2 des Außenhebels 4 verbindet, an seiner Oberseite 18 eine Komplementärfläche 17 besitzt.The inner lever 3 has at one end 8 at a bottom 7 a system 9 for at least one gas exchange valve. At the other end 10, the inner lever 3 at the bottom 7 has a complementary surface 11 for mounting on a head of a support element. At the same time it can be seen that above the complementary surface 11, a longitudinally displaceable slide is positioned as coupling means 6. This can be moved via hydraulic means in its coupling position. The latter can be conducted via a direct channel 27 from the head of the support element in front of an inner end of the coupling means 6. For a desired coupling case, the coupling means 6 is hydraulically extended in sections from the inner lever 3, for which a crossbar 16 at the other end 10, which connects the arms 2 of the outer lever 4, on its upper side 18 has a complementary surface 17.

Auf der Seite des einen Endes 8 hat der Außenhebel 4 nach der Achse 5 zwei Anlaufflächen 12 für respektive Großhubnocken. Diese sind hier als Gleitflächen ausgebildet. Der Innenhebel 3 besitzt in diesem Querbereich zwischen seinen Seitenwänden 19 eine drehbare und vorzugsweise wälzgelagerte Rolle, die als Anlauffläche 13 beispielsweise für einen Niedrighubnocken dient.On the side of the one end 8 of the outer lever 4 has after the axis 5 two contact surfaces 12 for respectively Großhubnocken. These are designed here as sliding surfaces. The inner lever 3 has in this transverse region between its side walls 19 a rotatable and preferably roller bearing roller, which serves as a contact surface 13, for example, for a low-lift cam.

Es ist zu erkennen, dass der Innenhebel 3 mit seinem Abschnitt, welcher die Anlage 9 am einen Ende 8 hat, über Stirnseiten 15 des Außenhebels 4 hinaussteht. Der Außenhebel 4 ist somit unmittelbar nach seinen Anlaufflächen 12 "abgekürzt". Offenbart ist zudem, dass der Innenhebel 3 im Bereich des einen Endes 8 durch einen Quersteg 20 verbunden ist, welcher an seiner Unterseite die vorgenannte Anlage 9 besitzt.It can be seen that the inner lever 3 with its section, which has the system 9 at one end 8, projects beyond end faces 15 of the outer lever 4. The outer lever 4 is thus "shortened" immediately after its contact surfaces 12. It is also disclosed that the inner lever 3 is connected in the region of one end 8 by a transverse web 20 which has the abovementioned abutment 9 on its underside.

Wie Figur 1 zeigt, ist die Achse 5 mit zwei Lost-Motion-Federn 14 versehen, die hier als Drehschenkelfedern ausgebildet sind. Diese Federn 14 verlaufen axial zwischen den Armen 2 des Außenhebels 4 und den Armen 19 des Innenhebels 3. Zur Schaffung des entsprechenden Bauraums sind die Arme 2 des Außenhebels 4 in diesem Bereich kastenartig ausgeformt.As Figure 1 shows, the axis 5 is provided with two lost-motion springs 14, which are designed here as torsion torsion springs. These springs 14 extend axially between the arms 2 of the outer lever 4 and the arms 19 of the inner lever 3. To create the appropriate space, the arms 2 of the outer lever 4 are formed in this area box-like.

Um eine fluchtende Lagezuordnung des Innenhebels 3 zum Außenhebel 4 bei Nockengrundkreisdurchlauf zu garantieren, werden zwei Vorschläge gemacht. Entweder steht am anderen Ende 10 von einem unteren Abschnitt 22 des Innenhebels 3 ein Ansatz 24 ab. Auf diesem kann der Querbalken 16 des Außenhebels 4 mit seiner Unterseite 25 zur Anlage kommen.In order to guarantee an aligned position assignment of the inner lever 3 to the outer lever 4 at Nockengrundkreisdurchlauf, two proposals are made. Either is at the other end 10 of a lower portion 22 of the inner lever 3, a projection 24 from. On this, the cross bar 16 of the outer lever 4 come to rest with its bottom 25.

Alternativ hierzu kann ein Querbalken 26 benutzt werden, der die Arme 2 des Außenhebels 4 in etwa im Bereich einer Quermittelebene des Schlepphebels 1, den Innenhebel 3 untergreifend, verbindet. Hierzu kann der Innenhebel 3 mit einem geeigneten Bereich seiner Unterseite 7 in Anlage auf einer Oberseite des Querbalkens 26 kommen.Alternatively, a crossbar 26 may be used, which connects the arms 2 of the outer lever 4 approximately in the region of a transverse center plane of the finger lever 1, the inner lever 3 under cross-connects. For this purpose, the inner lever 3 come into contact with a suitable region of its underside 7 on an upper side of the crossbar 26.

Wie beschreibungseinleitend dargelegt, ist die Achse 5, in Längsrichtung des Schlepphebels 1 gesehen, zwischen der Komplementärfläche 11 für das Abstützelement und den Anlaufflächen 12, 13 für die Hubnocken angeordnet. Somit wurde diese Achse 5, bezogen auf den beschreibungseinleitend zitierten Stand der Technik, deutlich weiter in Richtung zur Hebelmitte verlagert. Sie liegt jetzt deutlich näher am Schwenkpunkt des gesamten Schlepphebels 1 (Komplementärfläche 11). Hierdurch ist eine Reduzierung des Massenträgheitsmoments des gesamten Schlepphebels 1 um diesen Schwenkpunkt erzielbar, was zu einer Erhöhung der maximalen Drehzahl im gekoppelten Zustand des Schlepphebels 1 führen kann. Gleichzeitig ist auch im entkoppelten Zustand das Massenträgheitsmoment des Außenhebels 4 um die Achse 5 reduziert. Auch erfährt der Außenhebel 4 im Koppelzustand bei Nockenbeaufschlagung nicht mehr die relativ hohe Durchbiegung wie im beschreibungseinleitend zitierten Stand der Technik. Somit kann der Außenhebel 4 ggf. schwächer dimensioniert werden.As described in the introduction, the axis 5, seen in the longitudinal direction of the finger lever 1, between the complementary surface 11 for the support element and the contact surfaces 12, 13 arranged for the lifting cams. Thus, this axis 5, based on the introductory cited prior art, significantly shifted towards the center of the lever. It is now much closer to the pivot point of the entire finger lever 1 (complementary surface 11). As a result, a reduction in the mass moment of inertia of the entire finger lever 1 can be achieved around this pivot point, which can lead to an increase in the maximum speed in the coupled state of the finger lever 1. At the same time, the mass moment of inertia of the outer lever 4 is reduced about the axis 5 in the decoupled state. Also, the outer lever 4 no longer experiences the relatively high deflection in the coupling state when cam is applied as in the cited prior art. Thus, the outer lever 4 may be dimensioned weaker.

Liste der BezugszahlenList of reference numbers

  1. 1) Schlepphebel1) drag lever
  2. 2) Arm2) arm
  3. 3) Innenhebel3) Inner lever
  4. 4) Außenhebel4) outside lever
  5. 5) Achse5) axis
  6. 6) Koppelmittel6) Coupling agent
  7. 7) Unterseite7) bottom
  8. 8) Ende8) End
  9. 9) Anlage9) attachment
  10. 10)Ende10) End
  11. 11) Komplementärfläche11) Complementary surface
  12. 12)Anlauffläche12) stop face
  13. 13)Anlauffläche13) stop face
  14. 14) Lost-Motion-Feder14) Lost motion spring
  15. 15) Stirnseite15) front side
  16. 16)Querbalken16) crossbar
  17. 17)Komplementärfläche17) complementary surface
  18. 18)Oberseite18) top
  19. 19)Seitenwand19) side wall
  20. 20)Quersteg20) transverse web
  21. 21)Abschnitt21) section
  22. 22)Abschnitt22) section
  23. 23)Stirnfläche23) face
  24. 24)Ansatz24) approach
  25. 25) Unterseite25) bottom
  26. 26)Querbalken26) crossbar
  27. 27) Kanal27) channel

Claims (9)

Schaltbarer Schlepphebel (1) eines Ventiltriebs einer Brennkraftmaschine, mit einem Innen- und einem diesen mit seinen Armen (2) umschließenden Außenhebel (3, 4), wobei die Hebel (3, 4) auf einer gemeinsamen Achse (5) relativ zueinander verschwenkbeweglich verlaufen und über Koppelmittel (6) derartig miteinander verbindbar sind, dass bei Kopplung ein großer und bei Entkopplung ein kleiner oder 0-Ventilhub generiert ist, wobei der Innenhebel (3) an einer Unterseite (7) an einem Ende (8) eine Anlage (9) für ein Gaswechselventil und am anderen Ende (10) eine Komplementärfläche (11) für ein Abstützelement sowie der Au-βenhebel (4) auf jedem Arm eine Anlauffläche (12) für einen Großhubnocken und der Innenhebel (3) eine Anlauffläche (13) für einen Klein-oder 0-Hubnocken besitzt und wobei zwischen den Hebeln (3, 4) eine Lost-Motion-Feder (14) vorgesehen ist, dadurch gekennzeichnet, dass die Achse (5), in Längsrichtung des Schlepphebels (1) gesehen, zwischen der Komplementärfläche (11) für das Abstützelement und den Anlaufflächen (12, 13) für die Hubnocken angeordnet ist, wobei die Arme (2) des Außenhebels (4) am einen Ende (8) unmittelbar nach deren Anlaufflächen (12) in Stirnseiten (15) enden und wobei der Innenhebel (3), zumindest mit einem Bereich dessen Anlage (9) für das Gaswechselventil, längs über die Stirnseiten (15) der Arme (2) des Außenhebels (4) hinaussteht.Switchable drag lever (1) of a valve train of an internal combustion engine, with an inner and an outer lever (3, 4) enclosing it with its arms (2), the levers (3, 4) being pivotable relative to one another on a common axis (5) and coupling means (6) are connected to each other such that when coupling a large and decoupling a small or 0-valve stroke is generated, wherein the inner lever (3) on a bottom (7) at one end (8) a plant (9 ) for a gas exchange valve and at the other end (10) has a complementary surface (11) for a support element and the Au-βenhebel (4) on each arm, a stop surface (12) for a Großhubnocken and the inner lever (3) a contact surface (13) for has a small or 0-lift cam and wherein between the levers (3, 4) a lost-motion spring (14) is provided, characterized in that the axis (5), seen in the longitudinal direction of the finger lever (1), between the complementary fl surface (11) for the support element and the contact surfaces (12, 13) for the lifting cams is arranged, wherein the arms (2) of the outer lever (4) at one end (8) immediately after the contact surfaces (12) in end faces (15) and wherein the inner lever (3), at least with a portion of its system (9) for the gas exchange valve, extends longitudinally beyond the end faces (15) of the arms (2) of the outer lever (4). Schlepphebel nach Anspruch 1, dadurch gekennzeichnet, dass als Lost-Motion-Feder (14) wenigstens eine Drehschenkelfeder oder ein Drehschenkelfederpaket vorgesehen ist, die oder das auf der Achse (5) zwischen einem Arm (2) des Außenhebels (4) und dem Innenhebel (3) eingespannt ist.Drag lever according to claim 1, characterized in that there is provided as a lost-motion spring (14) at least one torsion spring or a torsion spring package, or on the axis (5) between an arm (2) of the outer lever (4) and the inner lever (3) is clamped. Schlepphebel nach Anspruch 1, dadurch gekennzeichnet, dass im Innenhebel (3), im Bereich oberhalb dessen Komplementärfläche (11) für das Abstützelement, ein in Längsrichtung des Schlepphebels (1) verlagerbarer Schieber als Koppelmittel (6) appliziert ist, wobei die Arme (2) des Außenhebels (4) an dem anderen Ende (10) gürtelartig durch einen Querbalken (16) verbunden sind und wobei das Koppelmittel (6) für den Koppelfall abschnittsweise auf eine Komplementärfläche (17) an einer Oberseite (18) des Querbalkens (16) verlagerbar ist.Drag lever according to claim 1, characterized in that in the inner lever (3), in the region above the complementary surface (11) for the support element, a in the longitudinal direction of the finger lever (1) displaceable slide as coupling means (6) is applied, wherein the arms (2 ) of the outer lever (4) at the other end (10) are connected like a belt by a transverse bar (16) and wherein the coupling means (6) for the coupling case in sections on a complementary surface (17) on an upper side (18) of the crossbar (16) is relocatable. Schlepphebel nach Anspruch 3, dadurch gekennzeichnet, dass der Innenhebel (3) aus zwei im wesentlichen aufrechten sowie dünnwandigen Seitenwänden (19) besteht, die zumindest im Bereich des einen Endes (8) durch einen Quersteg (20) mit der Anlage (9) für das Gaswechselventil verbunden sind, wobei das Koppelmittel (6) entweder in einem separaten Einsatzteil zwischen oder stirnseitig hinter den Seitenwänden (19) oder in einem einteilig mit den Seitenwänden (19) dargestellten Abschnitt (21) verläuft.Drag lever according to claim 3, characterized in that the inner lever (3) consists of two substantially upright and thin-walled side walls (19) at least in the region of one end (8) by a transverse web (20) with the system (9) the gas exchange valve are connected, wherein the coupling means (6) extends either in a separate insert part between or frontally behind the side walls (19) or in a portion (21) integrally formed with the side walls (19). Schlepphebel nach Anspruch 3, dadurch gekennzeichnet, dass von einem unteren Abschnitt (22) einer Stirnfläche (23) des Innenhebels (3) am anderen Ende (10) ein Ansatz (24) absteht, auf dem in einer Grundkreisphase der Nocken der Querbalken (16) mit dessen Unterseite (25) zur fluchtenden Ausrichtung des Koppelmittels (6) zu der Komplementärfläche (17) an der Oberseite (18) des Querbalkens (16) anschlägt.Drag lever according to claim 3, characterized in that from a lower portion (22) of an end face (23) of the inner lever (3) at the other end (10) projects a projection (24) on which in a base circle phase of the cam of the crossbar (16 ) with its underside (25) for aligned alignment of the coupling means (6) to the complementary surface (17) on the upper side (18) of the crossbar (16) abuts. Schlepphebel nach Anspruch 3, dadurch gekennzeichnet, dass die Arme (2) des Außenhebels (4) an der Unterseite (7) und im Längsabschnitt der Anlaufflächen (12, 13) durch einen Querbalken (26) untergriffen sind, auf dem in einer Grundkreisphase der Nocken der Innenhebel (3) mit einer Unterfläche zur fluchtenden Ausrichtung des Koppelmittels (6) zu der Komplementärfläche (17) an der Oberseite (18) des Querbalkens (16) anschlägt.Drag lever according to claim 3, characterized in that the arms (2) of the outer lever (4) on the underside (7) and in the longitudinal section of the contact surfaces (12, 13) are engaged by a transverse bar (26) on which in a Grundkreisphase the Cam of the inner lever (3) with a lower surface for alignment of the coupling means (6) to the complementary surface (17) on the upper side (18) of the crossbar (16) abuts. Schlepphebel nach Anspruch 1, dadurch gekennzeichnet, dass wenigstens eines der Bauteile Innenhebel (3)/ Außenhebel (4) aus einem dünnwandigen Leichtbauwerkstoff wie Blech besteht.Drag lever according to claim 1, characterized in that at least one of the components inner lever (3) / outer lever (4) consists of a thin-walled lightweight material such as sheet metal. Schlepphebel nach Anspruch 1, dadurch gekennzeichnet, dass als Anlauffläche (13) im Innenhebel (3) eine drehbare Rolle und als Anlaufflächen (12) am Außenhebel (4) Gleitflächen vorgesehen sind.Drag lever according to claim 1, characterized in that as a contact surface (13) in the inner lever (3) a rotatable roller and as contact surfaces (12) on the outer lever (4) sliding surfaces are provided. Schlepphebel nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass das Koppelmittel (6) in wenigstens eine Verlagerungsrichtung über Hydraulikmittel verlagerbar ist, das über einen die Komplementärfläche (11) im Innenhebel (3) schneidenden Kanal (27) heranleitbar ist.Drag lever according to claim 1 or 3, characterized in that the coupling means (6) in at least one displacement direction via hydraulic means is displaceable, which can be heranleitbar via a complementary surface (11) in the inner lever (3) intersecting channel (27).
EP06122627A 2005-11-10 2006-10-20 Switchable rocker arm of a valve train of an internal combustion engine Expired - Fee Related EP1785595B1 (en)

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EP1785595B1 EP1785595B1 (en) 2008-06-25

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US7377247B2 (en) 2008-05-27
DE502006000981D1 (en) 2008-08-07
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US20070101958A1 (en) 2007-05-10
KR20070050368A (en) 2007-05-15
DE102005053596A1 (en) 2007-05-16

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