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EP2013450A1 - Switchable cam follower of a valve train assembly of an internal combustion engine - Google Patents

Switchable cam follower of a valve train assembly of an internal combustion engine

Info

Publication number
EP2013450A1
EP2013450A1 EP07727963A EP07727963A EP2013450A1 EP 2013450 A1 EP2013450 A1 EP 2013450A1 EP 07727963 A EP07727963 A EP 07727963A EP 07727963 A EP07727963 A EP 07727963A EP 2013450 A1 EP2013450 A1 EP 2013450A1
Authority
EP
European Patent Office
Prior art keywords
lever
valve
arms
drag
gas exchange
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
EP07727963A
Other languages
German (de)
French (fr)
Other versions
EP2013450B1 (en
Inventor
Debora Manther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler KG filed Critical Schaeffler KG
Publication of EP2013450A1 publication Critical patent/EP2013450A1/en
Application granted granted Critical
Publication of EP2013450B1 publication Critical patent/EP2013450B1/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—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

Definitions

  • the invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an outer lever which includes an inner lever with its arms, which components pivot relative to each other on a common axis applied to a valve end and the inner lever at a bottom at the valve end Plant for a gas exchange valve and at the other end has a complementary surface for storage on a head of a support element, wherein the outer and inner levers are selectively connectable via coupling means to achieve a large valve lift, wherein when decoupling a small or O-valve stroke can be displayed, at least the outer lever has on its upper side at least one contact surface for a lifting cam and wherein the system is bounded laterally by two projecting from the cam follower in the valve direction guide plates for the gas exchange valve.
  • the object of the invention is therefore to provide a switchable drag lever of the aforementioned type, in which the cited disadvantages are eliminated.
  • the guide tabs emanate from the underside of the outer lever.
  • these tabs should be integrally formed with the inner lever and their outer sides are aligned with outer surfaces of the arms of the outer lever.
  • the guide tabs may be formed on the outer lever as separate components and connected by a suitable connection method such as welding, joining, etc. with the outer lever.
  • the inner lever and thus the entire drag lever can be made narrower at least at the valve end.
  • less space is required, so that a subsequent installation in cramped cylinder head concepts is possible.
  • the total mass of the tow hebeis can be lowered.
  • the moment of inertia is reduced compared to previous versions. Since the elimination of the guide tabs on the inner lever, the system for the gas exchange valve is virtually "open", a processing of this area is much easier.
  • lever parts can be produced by punching and bending, for example, from sheet steel / steel strip, wherein the projecting guide straps can be punched out or bent in one operation.
  • the axis with stumps at both ends protrudes beyond the outer surfaces of the arms of the outer lever and that precisely at this projecting area at least one Lost Motion spring as a torsion leg spring in per se known Way is applied.
  • This may be another contribution towards “narrowing" the rocker arm on its valve side (as compared to incorporating the lost-motion springs about the axis between outer surfaces of the inner lever and inner sides of the arms of the outer lever or generally within the arms of the outer lever ).
  • the contact surfaces for the Quhubnocken on the outer lever are designed as projecting from the upper sides outwardly projecting collar, which thus represent a sliding surface as a contact partner.
  • a roll can be applied here in each case.
  • the inner lever may have a role as a contact surface.
  • a sliding surface can also be applied here.
  • outer lever box-like so that it is connected by a respective double-ended crossbar.
  • This training has advantages in terms of stiffness and stability of the outer lever.
  • the arms of the outer lever are connected in the region of the other end (support element side) by a cross bar, this can be under the handles for the coupling case of a longitudinally extending from the inner lever slide as a coupling means.
  • This slide extends above the complementary surface of the inner lever for the Ab micle- ment.
  • the rocker arms parts or at least one of the arms (possibly except for an insert with the complementary surface) of the drag lever can also be made by casting.
  • a lightweight material such as plastic, which is optionally fiber or particle reinforced.
  • a particularly narrow-built rocker arm is present when dispensed to the aforementioned collar, which protrude from the top of the arms, and thus only the width of the top of the arms is used as a cam contact surface.
  • Figure 2 shows the drag lever of Figure 1, partially cut and from another perspective.
  • a switchable drag lever 1 of a valve train of an internal combustion engine This consists of a box-like outer lever 2 with two arms 3.
  • the arms 3 are connected at a valve-side end 5 and at an opposite other end 9 by a respective cross bow 17, 18.
  • the outer lever 2 includes an inner lever 4, wherein both levers 2, 4 are pivotally movable relative to each other. For this purpose, they run on an axis 6, which is applied approximately in the area above a gas exchange valve 8a.
  • the axis 6 projects beyond a respective stump 15 outer surfaces 14 of the arms 3 of the outer lever 2. Exactly in this area, each stump 15 can be surrounded by a rotary leg spring o. The like.
  • a lost motion spring in a conventional manner ,
  • the inner lever 4 has in the region of the valve-side end 5 on a lower side 7 a system 8 for the gas exchange valve 8a.
  • a dome-shaped here complementary surface 10 for storage on a head of a support element.
  • This complementary surface 10 may be provided in the inner lever 4 is a hydraulically displaceable in at least one direction slide as coupling means.
  • the inner lever 4 has a roller as a contact surface 19 for a low-lift cam. This is flanked on both sides by sliding surfaces as contact surfaces 1 1 on tops 10a of the arms 3 of the outer lever 2.
  • the contact surfaces 1 1 are formed as outwardly projecting, thin-walled longitudinal collar, which are preferably integrally connected to the outer lever 2. Run against these contact surfaces 1 1 respectively adjhubnocken.
  • the outer surfaces 14 of the arms 3 of the outer lever 2 are stepped. In the area of the valve-side end 5, they have their smallest thickness. Behind the axis 6, viewed in the direction of the other end 9, the outer surfaces 14 thicken each via a step 16. As shown in more detail in FIG. 2, the respective step 16 encloses the corresponding stump 15 in a half-shell-like manner at a small distance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

A switchable cam follower (1) of a valve train assembly of an internal combustion engine is proposed, with an external lever (2) that encloses an internal lever (4) with its arms (3), of which components (2, 4), that can deviate from each other flexibly, run on an axis (6) that is attached to a valve side end, and the internal lever (4) on an underside (7) on the valve side end (9) possesses a mechanism (8) for a gas exchange valve (8a) as well as a complementary surface (10) at the other end (9) for storage on a head of a support element. A special characteristic is that guidance plates (12) for the gas exchange valve (8a) come out from the underside (7) of the external lever (2). That way, the switchable cam follower (1) can be made narrower at least on the valve side. In addition, development of the mechanism (8) for the gas exchange valve (8a) on the internal lever (4) is simplified.

Description

Bezeichnung der Erfindung Name of the invention
Schaltbarer Schlepphebel eines Ventiltriebs einer BrennkraftmaschineSwitchable drag lever of a valve train of an internal combustion engine
Beschreibungdescription
Gebiet der ErfindungField of the invention
Die Erfindung betrifft einen schaltbaren Schlepphebel eines Ventiltriebs einer Brennkraftmaschine, mit einem Außenhebel, der mit seinen Armen einen Innenhebel einschließt, welche Bauteile relativ zueinander verschwenkbeweglich auf einer gemeinsamen, an einem ventilseitigen Ende applizierten Achse verlaufen und der Innenhebel an einer Unterseite an dem ventilseitigen Ende eine Anlage für ein Gaswechselventil sowie am anderen Ende eine Komplementärfläche zur Lagerung auf einem Kopf eines Abstützelements besitzt, wobei Außen- und Innenhebel über Koppelmittel zur Erzielung eines großen Ventilhubes wahlweise miteinander verbindbar sind, wobei bei Entkopplung ein kleiner oder O-Ventilhub darstellbar ist, wobei zumindest der Außenhebel an seiner Oberseite wenigstens eine Anlauffläche für einen Hubnocken aufweist und wobei die Anlage lateral durch zwei vom Schlepphebel in Ventilrichtung abstehende Führungslaschen für das Gaswechselventil begrenzt ist.The invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an outer lever which includes an inner lever with its arms, which components pivot relative to each other on a common axis applied to a valve end and the inner lever at a bottom at the valve end Plant for a gas exchange valve and at the other end has a complementary surface for storage on a head of a support element, wherein the outer and inner levers are selectively connectable via coupling means to achieve a large valve lift, wherein when decoupling a small or O-valve stroke can be displayed, at least the outer lever has on its upper side at least one contact surface for a lifting cam and wherein the system is bounded laterally by two projecting from the cam follower in the valve direction guide plates for the gas exchange valve.
Hintergrund der ErfindungBackground of the invention
Derartige Schlepphebel sind der Fachwelt hinreichend bekannt und müssen an dieser Stelle nicht näher beschrieben werden. Dabei stehen genau von demSuch rocker arms are well known in the art and need not be described in detail at this point. There are exactly that
Hebelteil mit der Anlage, hier Innenhebel, die Laschen zur lateralen Führung auf dem Ventilschaft in Ventilrichtung ab. Aufgrund dieser Ausbildung baut der schaltbare Schlepphebel an dem einen ventilseitigen Ende unnötig breit. Somit wird mehr Bauraum beansprucht und der Hebel besitzt eine größere Masse. Das Massenträgheitsmoment ist unnötig erhöht. Außerdem wird festgestellt, dass aufgrunde der vom Innenhebel abstehenden Führungslaschen eine Bear- beitung / Feinbearbeitung der Anlage an der Unterseite des Innenhebels erschwert ist.Lever with the system, here inner lever, the tabs for lateral guidance on the valve stem in the valve direction. Because of this training builds the switchable rocker arms on the one valve-side end unnecessarily wide. Thus, more space is required and the lever has a larger mass. The moment of inertia is unnecessarily increased. In addition, it is found that, due to the guide lugs projecting from the inner lever, machining / fine machining of the system on the underside of the inner lever is more difficult.
Aufgabe der ErfindungObject of the invention
Aufgabe der Erfindung ist es daher, einen schaltbaren Schlepphebel der vorgenannten Art zu schaffen, bei dem die zitierten Nachteile beseitigt sind.The object of the invention is therefore to provide a switchable drag lever of the aforementioned type, in which the cited disadvantages are eliminated.
Lösung der AufgabeSolution of the task
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Führungslaschen von der Unterseite des Außenhebels ausgehen. Vorzugsweise sollen diese Laschen einteilig mit dem Innenhebel ausgebildet sein und deren Außen- Seiten zu Außenflächen der Arme des Außenhebels fluchten. Gegebenenfalls können die Führungslaschen am Außenhebel auch als separate Bauteile ausgebildet und durch ein geeignetes Verbindungsverfahren wie Schweißen, Fügen etc. mit dem Außenhebel verbunden werden.According to the invention this object is achieved in that the guide tabs emanate from the underside of the outer lever. Preferably, these tabs should be integrally formed with the inner lever and their outer sides are aligned with outer surfaces of the arms of the outer lever. Optionally, the guide tabs may be formed on the outer lever as separate components and connected by a suitable connection method such as welding, joining, etc. with the outer lever.
Aufgrund der Anordnung der Führungslaschen am anderen Bauteil, nämlich am Außenhebel, kann der Innenhebel und somit der gesamte Schlepphebel zumindest am ventilseitigen Ende schmaler ausgebildet werden. Somit wird weniger Bauraum beansprucht, so dass auch ein nachträglicher Einbau in beengte Zylinderkopfkonzepte möglich ist. Außerdem ist die Gesamtmasse des Schlepp- hebeis absenkbar. Das Massenträgheitsmoment ist gegenüber bisherigen Ausführungen verringert. Da durch den Wegfall der Führungslaschen am Innenhebel die Anlage für das Gaswechselventil quasi „offen" vorliegt, ist eine Bearbeitung dieser Fläche deutlich vereinfacht.Due to the arrangement of the guide plates on the other component, namely on the outer lever, the inner lever and thus the entire drag lever can be made narrower at least at the valve end. Thus, less space is required, so that a subsequent installation in cramped cylinder head concepts is possible. In addition, the total mass of the tow hebeis can be lowered. The moment of inertia is reduced compared to previous versions. Since the elimination of the guide tabs on the inner lever, the system for the gas exchange valve is virtually "open", a processing of this area is much easier.
Zudem ist es vorgeschlagen, die Hebelteile stanz- biegetechnisch bspw. aus Stahlblech / Stahlband zu generieren, wobei die abstehenden Führungslaschen in einem Arbeitsgang mit ausgestanzt bzw. gebogen werden können.In addition, it is proposed that the lever parts can be produced by punching and bending, for example, from sheet steel / steel strip, wherein the projecting guide straps can be punched out or bent in one operation.
Die Achse, auf welcher die Hebelteile relativ zueinander verschwenkbeweglich gelagert sein sollen, verläuft gemäß einer zweckmäßigen Fortbildung der Erfindung unmittelbar oberhalb des Ventilschafts. Gegebenenfalls ist auch eine weiter in Richtung Hebelmitte gerückte Variante denkbar.The axis on which the lever parts are to be mounted pivotably relative to each other, according to an expedient development of the invention immediately above the valve stem. Optionally, a further in the direction of the lever center variant is conceivable.
Zudem kann es zweckmäßig sein, dass die Achse mit beidendigen Stümpfen (insgesamt nur ein Stumpf ist auch denkbar und vorgesehen) über die Außenflächen der Arme des Außenhebels hinaussteht und dass genau an diesem hinausstehenden Bereich wenigstens eine Lost Motion Feder wie eine Drehschenkelfeder in an sich bekannter Art und Weise appliziert ist. Dies kann einen weiteren Beitrag in Richtung „Schmalbau" des Schlepphebels an seiner Ventil- seite darstellen (im Vergleich zu einem Einbau der Lost-Motion-Federn um die Achse zwischen Außenflächen des Innenhebels und Innenseiten der Arme des Außenhebels oder generell innerhalb der Arme des Außenhebels).In addition, it may be expedient that the axis with stumps at both ends (in total only one stump is also conceivable and provided) protrudes beyond the outer surfaces of the arms of the outer lever and that precisely at this projecting area at least one Lost Motion spring as a torsion leg spring in per se known Way is applied. This may be another contribution towards "narrowing" the rocker arm on its valve side (as compared to incorporating the lost-motion springs about the axis between outer surfaces of the inner lever and inner sides of the arms of the outer lever or generally within the arms of the outer lever ).
Zudem ist es zweckmäßig und vorgesehen, die Außenfläche des jeweiligen Armes dickengestuft auszubilden. Die geringste Dicke liegt somit im Bereich der Ventilseite vor.In addition, it is expedient and provided to form the outer surface of the respective arm graded in thickness. The smallest thickness is thus in the area of the valve side.
Die Anlaufflächen für die Großhubnocken am Außenhebel sind als von dessen Oberseiten nach außen abstehende Kragen ausgebildet, die somit eine Gleit- fläche als Kontaktpartner darstellen. Alternativ kann hier jeweils eine Rolle appliziert werden. Im Falle einer Ausbildung des Schlepphebels als Hubumschalter kann der Innenhebel eine Rolle als Anlauffläche aufweisen. Gegebenenfalls kann hier auch eine Gleitfläche appliziert werden.The contact surfaces for the Großhubnocken on the outer lever are designed as projecting from the upper sides outwardly projecting collar, which thus represent a sliding surface as a contact partner. Alternatively, a roll can be applied here in each case. In the case of a design of the finger lever as Hubumschalter the inner lever may have a role as a contact surface. Optionally, a sliding surface can also be applied here.
Zudem ist es erfindungsgemäß hervorgesehen, den Außenhebel kastenartig auszubilden, so dass er durch je einen beidendigen Querbügel verbunden ist. Diese Ausbildung hat Vorteile hinsichtlich Steifigkeit und Stabilität des Außenhebels. Gegebenenfalls kann auf einen der Querbügel verzichtet werden.In addition, it is provided according to the invention to form the outer lever box-like, so that it is connected by a respective double-ended crossbar. This training has advantages in terms of stiffness and stability of the outer lever. Optionally, can be dispensed with one of the crossbar.
Für den besonders bevorzugten Fall, dass die Arme des Außenhebels im Bereich des anderen Endes (abstützelementseitig) durch einen Querbügel verbunden sind, kann dieser für den Koppelfall von einem längs vom Innenhebel ausgehenden Schieber als Koppelmittel Untergriffen werden. Dieser Schieber verläuft oberhalb der Komplementärfläche des Innenhebels für das Abstützele- ment.For the particularly preferred case that the arms of the outer lever are connected in the region of the other end (support element side) by a cross bar, this can be under the handles for the coupling case of a longitudinally extending from the inner lever slide as a coupling means. This slide extends above the complementary surface of the inner lever for the Abstützele- ment.
Anstelle der bevorzugten Blechausbildung der Schlepphebelteile oder wenigstens eines der Arme (ggf. bis auf ein Einsatzteil mit der Komplementärfläche) kann der Schlepphebel auch gießtechnisch hergestellt sein. Jedoch ist es auch denkbar und vorgesehen, diesen aus einem Leichtbauwerkstoff wie Kunststoff darzustellen, der optional faser- oder partikelverstärkt ist.Instead of the preferred sheet training the rocker arms parts or at least one of the arms (possibly except for an insert with the complementary surface) of the drag lever can also be made by casting. However, it is also conceivable and intended to represent this made of a lightweight material such as plastic, which is optionally fiber or particle reinforced.
Ein besonders schmalbauender Schlepphebel liegt dann vor, wenn auf die vor- genannten Kragen, welche von den Oberseite der Arme abstehen, verzichtet und somit lediglich die Breite der Oberseite der Arme als Nockenanlauffläche benutzt wird. Kurze Beschreibung der ZeichnungA particularly narrow-built rocker arm is present when dispensed to the aforementioned collar, which protrude from the top of the arms, and thus only the width of the top of the arms is used as a cam contact surface. Short description of the drawing
Die Erfindung ist anhand der Zeichnung näher erläutert.The invention is explained in more detail with reference to the drawing.
Es zeigen:Show it:
Figur 1 in einer räumlichen Ansicht einen erfindungsgemäßenFigure 1 in a three-dimensional view of an inventive
Schlepphebel undDrag lever and
Figur 2 den Schlepphebel nach Figur 1 , teilgeschnitten und aus einer anderen Perspektive.Figure 2 shows the drag lever of Figure 1, partially cut and from another perspective.
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Dargestellt ist ein schaltbarer Schlepphebel 1 eines Ventiltriebs einer Brennkraftmaschine. Dieser besteht aus einem kastenartigen Außenhebel 2 mit zwei Armen 3. Die Arme 3 sind an einem ventilseitigen Ende 5 und an einem gegenüberliegenden anderen Ende 9 durch je einen Querbügel 17, 18 verbunden. Der Außenhebel 2 schließt einen Innenhebel 4 ein, wobei beide Hebel 2, 4 relativ zueinander verschwenkbeweglich sind. Hierzu verlaufen sie auf einer Achse 6, die in etwa im Bereich oberhalb eines Gaswechselventils 8a appliziert ist. Die Achse 6 überragt mit je einem Stumpf 15 Außenflächen 14 der Arme 3 des Außenhebels 2. Genau in diesem Bereich kann jeder Stumpf 15 von einer Dreh- schenkelfeder o. dgl. als Lost-Motion-Feder in an sich bekannter Art und Weise umschlossen sein.Shown is a switchable drag lever 1 of a valve train of an internal combustion engine. This consists of a box-like outer lever 2 with two arms 3. The arms 3 are connected at a valve-side end 5 and at an opposite other end 9 by a respective cross bow 17, 18. The outer lever 2 includes an inner lever 4, wherein both levers 2, 4 are pivotally movable relative to each other. For this purpose, they run on an axis 6, which is applied approximately in the area above a gas exchange valve 8a. The axis 6 projects beyond a respective stump 15 outer surfaces 14 of the arms 3 of the outer lever 2. Exactly in this area, each stump 15 can be surrounded by a rotary leg spring o. The like. As a lost motion spring in a conventional manner ,
Der Innenhebel 4 hat im Bereich des ventilseitigen Endes 5 an einer Unterseite 7 eine Anlage 8 für das Gaswechselventil 8a. Am gegenüberliegenden anderen Ende 9 hat der Innenhebel 4 eine hier kalottenförmig ausgebildete Komplementärfläche 10 zur Lagerung auf einem Kopf eines Abstützelements. Oberhalb dieser Komplementärfläche 10 kann im Innenhebel 4 ein hydraulisch in wenigstens eine Richtung verlagerbarer Schieber als Koppelmittel vorgesehen sein.The inner lever 4 has in the region of the valve-side end 5 on a lower side 7 a system 8 for the gas exchange valve 8a. At the opposite other end 9 of the inner lever 4 has a dome-shaped here complementary surface 10 for storage on a head of a support element. Above This complementary surface 10 may be provided in the inner lever 4 is a hydraulically displaceable in at least one direction slide as coupling means.
Wie des Weiteren zu erkennen ist, besitzt der Innenhebel 4 eine Rolle als An- lauffläche 19 für einen Niedrighubnocken. Diese ist beidseitig flankiert von Gleitflächen als Anlaufflächen 1 1 an Oberseiten 10a der Arme 3 des Außenhebels 2. Die Anlaufflächen 1 1 sind als nach außen abstehende, dünnwandige Längskragen ausgebildet, die vorzugsweise einteilig mit dem Außenhebel 2 verbunden sind. Gegen diese Anlaufflächen 1 1 laufen respektive Großhubnocken.As can also be seen, the inner lever 4 has a roller as a contact surface 19 for a low-lift cam. This is flanked on both sides by sliding surfaces as contact surfaces 1 1 on tops 10a of the arms 3 of the outer lever 2. The contact surfaces 1 1 are formed as outwardly projecting, thin-walled longitudinal collar, which are preferably integrally connected to the outer lever 2. Run against these contact surfaces 1 1 respectively Großhubnocken.
Zudem ist dargestellt, dass die Außenflächen 14 der Arme 3 des Außenhebels 2 dickengestuft sind. Im Bereich des ventilseitigen Endes 5 haben sie ihre geringste Dicke. Hinter der Achse 6, in Richtung zum anderen Ende 9 betrachtet, verdicken sich die Außenflächen 14 über je eine Stufe 16. Wie aus Figur 2 nä- her hervorgeht, umschließt die jeweilige Stufe 16 den entsprechenden Stumpf 15 halbschalenähnlich mit geringem Abstand.In addition, it is shown that the outer surfaces 14 of the arms 3 of the outer lever 2 are stepped. In the area of the valve-side end 5, they have their smallest thickness. Behind the axis 6, viewed in the direction of the other end 9, the outer surfaces 14 thicken each via a step 16. As shown in more detail in FIG. 2, the respective step 16 encloses the corresponding stump 15 in a half-shell-like manner at a small distance.
Von Unterseiten 7 der Arme 3 geht im Bereich der Anlage 8 für das Gaswechselventil am Innenhebel 4 je eine Führungslasche 12 für das Gaswechselventil einteilig aus. Aufgrund dieser „Verlagerung" der Führungslaschen 12 vom eigentlichen Bauteil (Innenhebel 4) mit der Anlage 8 „nach außen" kann der Schlepphebel 1 zumindest im Bereich des ventilseitigen Endes 5 deutlich schmaler als bisherig ausgeführte Schlepphebel gebaut werden. Aufgrund dieser insgesamt schmaleren Ausbildung hat er eine geringere Masse und ein ge- ringeres Massenträgheitsmoment. Außerdem kann die somit nunmehr „offenliegende" Anlage 8 an der Unterseite 7 des Innenhebels 4 einfacher feinbearbeitet (schleifen etc.) werden. Hierdurch sind die Fertigungskosten absenkbar. Liste der BezugszahlenFrom bottoms 7 of the arms 3 is in the area of the system 8 for the gas exchange valve on the inner lever 4 depending on a guide plate 12 for the gas exchange valve in one piece. Because of this "displacement" of the guide plates 12 from the actual component (inner lever 4) with the system 8 "outwards", the drag lever 1 can be built at least in the region of the valve end 5 significantly narrower than previously executed drag levers. Due to this overall narrower design, it has a lower mass and a lower mass moment of inertia. In addition, the installation 8, which is thus now "exposed", can be more easily finished (ground, etc.) on the underside 7 of the inner lever 4. List of reference numbers
1 ) Schlepphebel1) drag lever
2) Außenhebel 3) Arm2) outside lever 3) arm
4) Innenhebel4) Inner lever
5) ventilseitiges Ende5) valve-side end
6) Achse6) axis
7) Unterseite 8) Anlage7) bottom 8) attachment
8a)Gaswechselventil8a) gas exchange valve
9) anderes Ende9) other end
10) Komplementärfläche 10a)0berseite 11 )Anlauffläche Außenhebel10) Complementary surface 10a) upper side 11) contact surface outer lever
12) Führungslasche12) Guide tab
13)Außenseite Führungslasche13) outside guide strap
14) Außenfläche Arm14) outer surface arm
15)Stumpf 16) Stufe15) stump 16) step
17)Querbügel17) levers
18)Querbügel18) levers
19)Anlauffläche Innenhebel 19) contact surface inner lever

Claims

Patentansprüche claims
1. Schaltbarer Schlepphebel (1 ) eines Ventiltriebs einer Brennkraftmaschine, mit einem Außenhebel (2), der mit seinen Armen (3) einen Innenhe- bei (4) einschließt, welche Bauteile (2, 4) relativ zueinander verschwenk- beweglich auf einer gemeinsamen, an einem ventilseitigen Ende (5) applizierten Achse (6) verlaufen und der Innenhebel (4) an einer Unterseite (7) an dem ventilseitigen Ende (5) eine Anlage (8) für ein Gaswechselventil (8a) sowie am anderen Ende (9) eine Komplementärfläche (10) zur Lagerung auf einem Kopf eines Abstützelements besitzt, wobei Außen- und Innenhebel (2, 4) über Koppelmittel zur Erzielung eines großen Ventilhubes wahlweise miteinander verbindbar sind, wobei bei Entkopplung ein kleiner oder O-Ventilhub darstellbar ist, wobei zumindest der Außenhebel (2) an seiner Oberseite (10a) wenigstens eine Anlauffläche (1 1 ) für einen Hubnocken aufweist und wobei die Anlage (8) lateral durch zwei vom Schlepphebel (1 ) in Ventilrichtung abstehende Führungslaschen (12) für das Gaswechselventil (8a) begrenzt ist, dadurch gekennzeichnet, dass die Führungslaschen (12) von der Unterseite (7) des Außenhebels (2) ausgehen.1. Switchable drag lever (1) of a valve train of an internal combustion engine, with an outer lever (2) with its arms (3) an inner He- in (4), which components (2, 4) relative to each other pivotally movable on a common , an axis (6) applied to a valve-side end (5), and the inner lever (4) at a lower side (7) at the valve-side end (5) a system (8) for a gas exchange valve (8a) and at the other end (9 ) has a complementary surface (10) for mounting on a head of a support element, wherein the outer and inner levers (2, 4) via coupling means to achieve a large valve lift are selectively connectable to each other, wherein in decoupling a small or O-valve stroke can be displayed, wherein at least the outer lever (2) on its upper side (10a) has at least one contact surface (1 1) for a lifting cam and wherein the system (8) laterally by two from the finger lever (1) projecting in the valve direction guide glass chen (12) for the gas exchange valve (8a) is limited, characterized in that the guide tabs (12) from the bottom (7) of the outer lever (2) go out.
2. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass Außenseiten (13) der Führungslaschen (12) zu Außenflächen (14) der Arme (3) des Außenhebels (2) an dem ventilseitigen Ende (5) fluchten oder ge- ringfügig eingezogen verlaufen.2. drag lever according to claim 1, characterized in that outer sides (13) of the guide plates (12) to outer surfaces (14) of the arms (3) of the outer lever (2) at the valve end (5) are aligned or slightly retracted.
3. Schlepphebel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Führungslaschen (12) einteilig mit dem Außenhebel (2) ausgebildet sind. 3. drag lever according to claim 1 or 2, characterized in that the guide plates (12) are formed integrally with the outer lever (2).
4. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass der Außenhebel (2) in Längsrichtung gesehen breitengestuft oder sich verjüngend mit jeweils geringster Gesamtbreite am ventilseitigen Ende (5) dargestellt ist.4. rocker arm according to claim 1, characterized in that the outer lever (2) seen in the longitudinal direction stepped or tapered, each with the smallest overall width at the valve end (5) is shown.
5. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass die Achse (6) in einem Bereich oberhalb der Anlage (8) für das Gaswechselventil (8a) den Schlepphebel (1 ) durchragt und über die Außenflächen (14) der Arme (3) des Außenhebels (2) mit je einem Stumpf (15) hinaussteht, wobei wenigstens ein Stumpf (15) von einer Drehschenkelfeder als Lost-Motion-Feder umschlossen ist.5. rocker arm according to claim 1, characterized in that the axis (6) in a region above the system (8) for the gas exchange valve (8 a) through the rocker arm (1) and over the outer surfaces (14) of the arms (3) of the Outer lever (2) with one stump (15) protruding, wherein at least one stump (15) is surrounded by a torsion spring as a lost-motion spring.
6. Schlepphebel nach Anspruch 5, dadurch gekennzeichnet, dass die Außenflächen (14) der Arme (3) des Außenhebels (2) im Umgebungsbereich der Achse (6), bis auf deren dem anderen Ende (9) zugewandten Sektor, glattflächig dargestellt sind, wobei im Bereich dieses Sektors die Außenflächen (14) sich über eine Stufe (16) erweitern, welche Achse (6) durch die Stufe (16) halbschalenartig umschlossen ist.6. drag lever according to claim 5, characterized in that the outer surfaces (14) of the arms (3) of the outer lever (2) in the vicinity of the axis (6), except for the other end (9) facing sector, are shown smooth surface, wherein in the region of this sector, the outer surfaces (14) extend over a step (16), which axis (6) is enclosed by the step (16) in a half-shell-like manner.
7. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass die Arme (3) des Außenhebels (2) ein- oder beidendig durch einen Querbü- gel (17, 18) verbunden sind.7. drag lever according to claim 1, characterized in that the arms (3) of the outer lever (2) on one or both ends by a transverse bow (17, 18) are connected.
8. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass, im Falle der Ausbildung des Innenhebels (4) ebenfalls mit einer Anlauffläche (19) für einen Hubnocken (Niedrighubnocken), die Anlauffläche (19) als8. drag lever according to claim 1, characterized in that, in the case of the formation of the inner lever (4) also with a contact surface (19) for a lifting cam (low-lift cams), the thrust surface (19)
Rolle ausgebildet ist, wobei die Anlauffläche (1 1 ) des Außenhebels (2) als Gleitfläche an den Oberseiten (10a) eines oder beider Arme (3) oder ebenfalls als jeweilige Rolle vorliegt.Roller is formed, wherein the contact surface (1 1) of the outer lever (2) is present as a sliding surface on the upper sides (10a) of one or both arms (3) or also as a respective roller.
9. Schlepphebel nach Anspruch 8, dadurch gekennzeichnet, dass, im Fall der Ausbildung der Anlaufflächen (1 1 ) am Außenhebel (2) als Gleitflächen, diese, die Oberseiten (10a) verbreiternd, als dünnwandige Längskragen abstehen.9. drag lever according to claim 8, characterized in that, in the case of the formation of the contact surfaces (1 1) on the outer lever (2) as sliding surfaces, these, the tops (10 a) widening, protrude as a thin-walled longitudinal collar.
10. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass wenigstens eines der Bauteile Außenhebel (2) / Innenhebel (4) zumindest abschnittsweise stanz-biegetechnisch aus Stahlblech oder einem Leichtbauwerkstoff wie Kunststoff oder faser- bzw. partikelverstärktem Kunst- Stoff gefertigt ist. 10. drag lever according to claim 1, characterized in that at least one of the components outer lever (2) / inner lever (4) is at least partially punch-bending technology made of sheet steel or a lightweight material such as plastic or fiber or particle-reinforced synthetic material.
EP07727963.6A 2006-04-21 2007-04-11 Switchable cam follower of a valve train assembly of an internal combustion engine Ceased EP2013450B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74531706P 2006-04-21 2006-04-21
PCT/EP2007/053495 WO2007122105A1 (en) 2006-04-21 2007-04-11 Switchable cam follower of a valve train assembly of an internal combustion engine

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EP2013450A1 true EP2013450A1 (en) 2009-01-14
EP2013450B1 EP2013450B1 (en) 2013-06-19

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EP07727963.6A Ceased EP2013450B1 (en) 2006-04-21 2007-04-11 Switchable cam follower of a valve train assembly of an internal combustion engine

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US (1) US8132551B2 (en)
EP (1) EP2013450B1 (en)
WO (1) WO2007122105A1 (en)

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Publication number Publication date
EP2013450B1 (en) 2013-06-19
US20090064954A1 (en) 2009-03-12
WO2007122105A1 (en) 2007-11-01
US8132551B2 (en) 2012-03-13

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