WO2008068251A1 - Switchable cam lever of a valve drive of an internal combustion engine - Google Patents

Switchable cam lever of a valve drive of an internal combustion engine Download PDF

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Publication number
WO2008068251A1
WO2008068251A1 PCT/EP2007/063265 EP2007063265W WO2008068251A1 WO 2008068251 A1 WO2008068251 A1 WO 2008068251A1 EP 2007063265 W EP2007063265 W EP 2007063265W WO 2008068251 A1 WO2008068251 A1 WO 2008068251A1
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WO
WIPO (PCT)
Prior art keywords
coupling
lever
bore
coupling piston
contact surface
Prior art date
Application number
PCT/EP2007/063265
Other languages
German (de)
French (fr)
Inventor
Stefan Gemein
Joachim Krause
Jens Lang
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 WO2008068251A1 publication Critical patent/WO2008068251A1/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
    • 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
    • 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

Definitions

  • the invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an outer and between the arms or on the arm extending inner lever, both levers are relatively pivotable relative to each other and the inner lever at one end on its underside a contact surface for a head of a support element and - At the end of a system for at least one gas exchange valve is immanent, wherein in the region of the contact surface a bore extends with at least one coupling piston which is engageable with a driving surface of the outer lever in sections for a coupling case of the lever and wherein at least one outer side of at least the outer lever Contact surface is applied for a lifting cam.
  • Such drag levers are known in the art.
  • a stop bushing In the respective bore for the coupling piston end stop a stop bushing is pressed. Through the latter runs a coupling piston extending pipe section, which passes outside in a plate area.
  • the coupling piston learns about the plate area at the stop bushing a travel limit in the coupling direction.
  • the bush also serves as a single end support for the screw compression spring.
  • an inner end region of the bush can serve as a travel limit for the coupling piston in its decoupling direction. It is disadvantageous in the aforementioned embodiment that the manufacturing and assembly costs for the socket is relatively high. So this has to be introduced exactly defined in terms of their insertion force and their way into the bore for the coupling piston.
  • 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 bore is shown from exactly two stepped sections in which the coupling piston with two stepped, complementary jacket areas extends, with a travel limit of the coupling piston in one direction via a system whose ring area between its lateral areas on an annular collar between the sections of the hole is shown.
  • switchable drag lever which is constructed significantly simplified in the region of its coupling mechanism and can be easily assembled. It is only necessary to drill the bore for the coupling piston from particularly preferably represent two stepped sections (possibly also more than two stages are conceivable), in which then runs the also two-stage coupling piston. Due to the abovementioned abutment of the annular region of the coupling piston on the annular collar of the bore, its end position in the coupling or decoupling direction is reliably determined.
  • the bore can have an annular collar in both directions, by means of which the movement of the coupling piston can be fixed in both directions.
  • the ring area and the ring collar can be made cone-shaped.
  • the coupling piston should be integrally formed. Possibly. is also the multi-part training conceivable and provided.
  • the entire coupling mechanism can build axially and possibly also radially smaller.
  • the driver surface of the swiveling in the decoupling outer lever may be formed, for example, as a shell-like bottom or as a bore, below or into which the coupling piston moves in the coupling case.
  • the coupling piston is formed with its bore as a so-called “longitudinal locking device.” It is also particularly preferred to let the coupling piston move obliquely under the driving surface of the transverse region of the outer lever ,
  • the drag lever according to the invention can be designed either as a valve lift switch or possibly as Ventilhubabschalter.
  • the coupling piston is acted upon in the coupling direction by means of compression spring force.
  • the coupling piston can also be displaced in the Entkoppeliques about compression spring force.
  • a provision of the coupling piston in the respective other direction should be effected via hydraulic means, which can be derived from the support element via the contact surface. Due to the annulus on the ring collar can be dispensed with separate measures to create a pressure chamber.
  • the at least one compression spring in a blind hole in the region of the inner end of the coupling piston run.
  • FIG. 2 shows an alternative design to FIG. 1.
  • FIG. 1 Shown in FIG. 1 is a partial longitudinal section through a switchable towing lever 1 in the region of its coupling mechanism.
  • the other end area with a system for the gas exchange valve is not shown in the drawing for the sake of simplicity.
  • the drag lever 1 consists of an outer lever 3, between the arms 2, an inner lever 4 extends.
  • the inner lever 4 also on the underside 5, a system for at least one gas exchange valve.
  • This bore 7 consists of two sections 13, 14, of which according to Fig. 1, the section 13 (inside) has a smaller diameter than the section 14 (outside) and according to FIG. 2, the section 13 has a larger diameter than the section 14.
  • an annular collar 18 is formed, on which the stepped coupling piston 8 with its annular region 17 finds a stop in one direction (FIGS. 1, 2).
  • the bore 7 extends in an imaginary extension obliquely under a complementary driver surface 9 (Fig. 1) of a bow-shaped transverse region 19 of the outer lever 3 behind the end of the inner lever 4.
  • the oblique course of the bore 7 with coupling piston 8 possibly reduces the overall height of the entire follower lever 1 or the transverse region 19 of the outer lever 3 can be built sufficiently "high".
  • the coupling piston 8 is displaceable in the decoupling direction by way of the force of at least one helical compression spring 20 and in the coupling direction via hydraulic medium which can be led out of the contact surface 6.
  • the latter is part of a guided by the helical compression spring 20, remote coupling extension of the coupling piston 8.
  • the other end, the helical compression spring 20 acts against a coupling-side stop surface of the inner lever 4.
  • the hydraulic fluid is from the contact surface 6 via a direct channel 23rd in an annular space 24 in front of the annular region 17 of the coupling piston 8 can be conducted.
  • the coupling piston 8 in the region of its inner end 21 has a blind hole 28.
  • the helical compression spring 20 is supported at one end. This works at the other end against a separate stop ring 22.
  • the stop ring 22 experiences an axial travel limit to the outside on a Sich ceremoniessele- element 25 as a snap ring which extends in an unspecified annular groove of the bore 7.
  • FIG. 2 shows the coupling position of the coupling piston 8.
  • the coupling piston 8 also learn a stop position in Entkoppelraum. Additional stop bushings, as in the prior art, can thus be dispensed with.
  • Fig. 2 due to the sectional arrangement of the helical compression spring 20 in the blind hole 28 of the coupling piston 8 made a contribution to an axially relatively short-built coupling mechanism.
  • Fig. 1 From Fig. 1 can also be seen that on top 11 of the arms 2 of the outer lever 3, a contact surface 12 is present for each one renal hubnocken (shown is only one arm 2). An upper side of the inner lever 4 is, for example, acted upon by a Niedrighubnocken. On both tops 11 can optionally be applied rollers or sliding surfaces.

Abstract

The invention relates to a switchable cam lever (1) of a valve drive of an internal combustion engine having an external and an internal lever (3, 4), the internal lever (4) having on one end a contact surface (6) for a head of a support element, wherein a drilled hole (7) with at least one coupling piston (8) extends in the region of the contact surface (6) which, when the levers (3, 4) are coupled, can be brought section by section into engagement with a drive surface (9) of the outer lever (3), wherein the drilled hole (7) is formed from exactly two stepped sections (13, 14) in which the coupling piston (8) extends with two stepped, complementary cover regions (15, 16), wherein a restriction of the travel of the coupling piston (8) is made in one direction via an arrangement of the annular region (17) of said coupling piston (8) between the cover regions (15, 16) thereof on an annular collar (18) between the sections (13, 14) of the drilled hole (7).

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 Außen- und einem zwischen dessen Armen oder an dessen Arm verlaufenden Innenhebel, wobei beide Hebel zueinander relativ verschwenkbeweglich sind und dem Innenhebel einenends an seiner Unterseite eine Kontaktfläche für einen Kopf eines Abstützelements sowie an- derenends eine Anlage für wenigstens ein Gaswechselventil immanent ist, wobei im Bereich der Kontaktfläche eine Bohrung mit zumindest einem Koppelkolben verläuft, der für einen Koppelfall der Hebel abschnittsweise mit einer Mitnehmerfläche des Außenhebels in Eingriff bringbar ist und wobei an einer Oberseite zumindest des Außenhebels wenigstens eine Anlauffläche für einen Hubnocken appliziert ist.The invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an outer and between the arms or on the arm extending inner lever, both levers are relatively pivotable relative to each other and the inner lever at one end on its underside a contact surface for a head of a support element and - At the end of a system for at least one gas exchange valve is immanent, wherein in the region of the contact surface a bore extends with at least one coupling piston which is engageable with a driving surface of the outer lever in sections for a coupling case of the lever and wherein at least one outer side of at least the outer lever Contact surface is applied for a lifting cam.
Hintergrund der ErfindungBackground of the invention
Derartige Schlepphebel sind der Fachwelt bekannt. In die jeweilige Bohrung für den Koppelkolben ist endseitig eine Anschlagbuchse eingepresst. Durch Letztere verläuft ein den Koppelkolben verlängernder Rohrabschnitt, welcher außen in einen Tellerbereich übergeht. Der Koppelkolben erfährt über den Tellerbereich an der Anschlagbuchse eine Wegbegrenzung in dessen Koppelrichtung. Die Buchse dient außerdem als einenendige Abstützung für die Schrau- bendruckfeder. Außerdem kann ein Innenstirnbereich der Buchse als Wegbegrenzung für den Koppelkolben in dessen Entkoppelrichtung dienen. Nachteilig ist es bei der vorgenannten Ausgestaltung, dass der Fertigungs- und Montageaufwand für die Buchse relativ hoch ist. So muss diese hinsichtlich ihrer Einpresskraft und ihres Weges genau definiert in die Bohrung für den Koppelkolben eingebracht werden. Somit ist dem Fachmann klar, dass in die- sem Bereich eine äußerst genaue Tolerierung bzw. Zupaarung erforderlich ist. Ein zu starkes Einpressen der Buchse kann zu einer unerwünschten Materialverformung im Bohrungsbereich führen. Auch besteht die Gefahr, dass die Buchse sich während des Betriebs des Schlepphebels löst und es somit zu einem Totalausfall des Koppelmechanismus kommt.Such drag levers are known in the art. In the respective bore for the coupling piston end stop a stop bushing is pressed. Through the latter runs a coupling piston extending pipe section, which passes outside in a plate area. The coupling piston learns about the plate area at the stop bushing a travel limit in the coupling direction. The bush also serves as a single end support for the screw compression spring. In addition, an inner end region of the bush can serve as a travel limit for the coupling piston in its decoupling direction. It is disadvantageous in the aforementioned embodiment that the manufacturing and assembly costs for the socket is relatively high. So this has to be introduced exactly defined in terms of their insertion force and their way into the bore for the coupling piston. It is therefore clear to the person skilled in the art that extremely precise toleration or pairing is required in this area. Excessive press-fitting of the bushing can lead to undesired material deformation in the bore area. There is also the danger that the socket will come off during operation of the finger lever and thus there will be a total failure of the coupling mechanism.
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 Bohrung aus genau zwei gestuften Abschnitten dargestellt ist, in denen der Koppelkolben mit zwei gestuften, komplementären Mantelbereichen verläuft, wobei eine Wegbegrenzung des Koppelkolbens in eine Richtung über eine Anlage dessen Ringbereichs zwischen seinen Mantelbereichen an einem Ringkragen zwischen den Abschnitten der Bohrung dargestellt ist.According to the invention, this object is achieved in that the bore is shown from exactly two stepped sections in which the coupling piston with two stepped, complementary jacket areas extends, with a travel limit of the coupling piston in one direction via a system whose ring area between its lateral areas on an annular collar between the sections of the hole is shown.
Zweckmäßige Konkretisierungen der Erfindung sind Gegenstand der Unteransprüche, denen auch selbständig schutzfähige Maßnahmen immanent sein können.Appropriate concretions of the invention are the subject of the dependent claims, which also self-protective measures can be immanent.
Somit liegt ein schaltbarer Schlepphebel vor, der im Bereich seines Koppelmechanismus deutlich vereinfacht aufgebaut ist und der sich leicht montieren lässt. Es ist lediglich erforderlich, die Bohrung für den Koppelkolben aus be- sonders bevorzugt zwei gestuften Abschnitten darzustellen (ggf. sind auch mehr als zwei Stufen denkbar), in welchen dann der ebenfalls zweigestufte Koppelkolben verläuft. Durch die vorgenannte Anlage des Ringbereichs des Koppelkolbens an dem Ringkragen der Bohrung ist dessen Endposition in Koppel- oder Entkoppelrichtung sicher determiniert.Thus, there is a switchable drag lever, which is constructed significantly simplified in the region of its coupling mechanism and can be easily assembled. It is only necessary to drill the bore for the coupling piston from particularly preferably represent two stepped sections (possibly also more than two stages are conceivable), in which then runs the also two-stage coupling piston. Due to the abovementioned abutment of the annular region of the coupling piston on the annular collar of the bore, its end position in the coupling or decoupling direction is reliably determined.
Ggf. kann die Bohrung in beide Richtungen einen Ringkragen besitzen, durch den die Bewegung des Koppelkolbens in beide Richtungen festlegbar ist. Auch können der Ringbereich sowie der Ringkragen kegelförmig angestellt sein. Zweckmäßigerweise soll der Koppelkolben einteilig ausgebildet sein. Ggf. ist auch dessen mehrteilige Ausbildung denkbar und vorgesehen.Possibly. the bore can have an annular collar in both directions, by means of which the movement of the coupling piston can be fixed in both directions. Also, the ring area and the ring collar can be made cone-shaped. Conveniently, the coupling piston should be integrally formed. Possibly. is also the multi-part training conceivable and provided.
Aufgrund des Wegfalls der Anschlagbuchse aus dem Stand der Technik kann der gesamte Koppelmechanismus axial und ggf. auch radial kleiner bauen.Due to the omission of the stop bushing of the prior art, the entire coupling mechanism can build axially and possibly also radially smaller.
Fertigungstechnisch besonders einfach ist es, die Bohrung längs durchgehend darzustellen. Die Mitnehmerfläche des im Entkoppelfall abschwenkenden Außenhebels kann beispielsweise als schalenartige Unterseite oder als Bohrung ausgebildet sein, unter oder in die der Koppelkolben im Koppelfall einfährt.In terms of manufacturing technology, it is particularly easy to display the bore longitudinally. The driver surface of the swiveling in the decoupling outer lever may be formed, for example, as a shell-like bottom or as a bore, below or into which the coupling piston moves in the coupling case.
Besonders bevorzugt ist es, wenn der Koppelkolben mit seiner Bohrung als so genannter „Längsverriegler" ausgebildet ist. Ebenfalls besonders bevorzugt ist es, den Koppelkolben schräg unter die Mitnehmerfläche des Querbereichs des Außenhebels fahren zu lassen. Ggf. kann der Koppelkolben auch quer verrie- geh.It is particularly preferred if the coupling piston is formed with its bore as a so-called "longitudinal locking device." It is also particularly preferred to let the coupling piston move obliquely under the driving surface of the transverse region of the outer lever ,
Der erfindungsgemäße Schlepphebel kann entweder als Ventilhubumschalter oder ggf. als Ventilhubabschalter ausgebildet sein.The drag lever according to the invention can be designed either as a valve lift switch or possibly as Ventilhubabschalter.
Es ist des Weiteren vorgeschlagen, dass der Koppelkolben in dessen Koppelrichtung über Druckfederkraft beaufschlagt ist. Alternativ kann der Koppelkolben auch in dessen Entkoppelrichtung über Druckfederkraft verlagert werden. Eine Rückstellung des Koppelkolbens in die jeweils andere Richtung soll über Hydraulikmittel erfolgen, das aus dem Abstützelement über die Kontaktfläche heranleitbar ist. Aufgrund des Ringraums am Ringkragen kann auf separate Maßnahmen zur Schaffung eines Druckraums verzichtet werden.It is further proposed that the coupling piston is acted upon in the coupling direction by means of compression spring force. Alternatively, the coupling piston can also be displaced in the Entkoppelrichtung about compression spring force. A provision of the coupling piston in the respective other direction should be effected via hydraulic means, which can be derived from the support element via the contact surface. Due to the annulus on the ring collar can be dispensed with separate measures to create a pressure chamber.
Um axialen Bauraum zu sparen, kann bei einer Variante die wenigstens eine Druckfeder in einem Sackloch im Bereich der Innenstirn des Koppelkolbens verlaufen.In order to save axial space, in a variant, the at least one compression spring in a blind hole in the region of the inner end of the coupling piston run.
Auch ist es vorgeschlagen, die Druckfeder an einem Ende an einem separaten Anschlagring anzulegen, der in dem größeren Bohrungsabschnitt zumindest mittelbar befestigt ist. Zwar kann der Anschlagring unmittelbar in die Bohrung eingepresst sein, denkbar und vorgesehen ist es jedoch auch, diesen über einen einfachen Sprengring oder dergleichen in der Bohrung zu fixieren, wel- eher Sprengring in einer entsprechenden Ringnut der Bohrung verläuft.It is also proposed to apply the compression spring at one end to a separate stop ring which is at least indirectly fixed in the larger bore portion. Although the stop ring can be pressed directly into the bore, it is also conceivable and intended, however, to fix it in the bore by means of a simple snap ring or the like, which tends to be a snap ring in a corresponding annular groove of the bore.
Kurze Beschreibung der ZeichnungShort description of the drawing
Die Erfindung ist zweckmäßigerweise anhand der Zeichnung näher erläutert. Es zeigtThe invention is suitably explained in more detail with reference to the drawing. It shows
• Figur 1 einen Teillängsschnitt durch den erfindungsgemäßen Schlepphebel im Bereich dessen Koppelmechanismus und1 shows a partial longitudinal section through the drag lever according to the invention in the region of the coupling mechanism and
• Figur 2 eine alternative Gestaltung zu Figur 1.FIG. 2 shows an alternative design to FIG. 1.
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Dargestellt ist in Fig. 1 ein Teillängsschnitt durch einen schaltbaren Schlepp- hebel 1 im Bereich dessen Koppelmechanismus. Der anderenendige Bereich mit einer Anlage für das Gaswechselventil ist der Einfachheit halber zeichnerisch nicht dargestellt. Der Schlepphebel 1 besteht aus einem Außenhebel 3, zwischen dessen Armen 2 ein Innenhebel 4 verläuft. An einer Unterseite 5 des Innenhebels 4 ist an einem Ende eine Kontaktfläche 6 zur Lagerung des Schlepphebels 1 auf einem Kopf eines Abstützelements appliziert. Am anderen Ende des Schlepphebels 1 hat der Innenhebel 4, ebenfalls an der Unterseite 5, eine Anlage für zumindest ein Gaswechselventil.Shown in FIG. 1 is a partial longitudinal section through a switchable towing lever 1 in the region of its coupling mechanism. The other end area with a system for the gas exchange valve is not shown in the drawing for the sake of simplicity. The drag lever 1 consists of an outer lever 3, between the arms 2, an inner lever 4 extends. On an underside 5 of the inner lever 4, a contact surface 6 for supporting the finger lever 1 on a head of a support element is applied at one end. At the other end of the finger lever 1, the inner lever 4, also on the underside 5, a system for at least one gas exchange valve.
Oberhalb der Kontaktfläche 6 verläuft bei beiden Ausgestaltungen eine hier längs und schräg angeordnete Bohrung 7 für einen Koppelkolben 8. Diese Bohrung 7 besteht aus zwei Abschnitten 13, 14, von denen nach Fig. 1 der Abschnitt 13 (innen) einen geringeren Durchmesser als der Abschnitt 14 (außen) und nach Fig. 2 der Abschnitt 13 einen größeren Durchmesser als der Abschnitt 14 besitzt. Zwischen beiden Abschnitten 13, 14 ist ein Ringkragen 18 gebildet, an dem der gestufte Koppelkolben 8 mit seinem Ringbereich 17 einen Anschlag in eine Richtung findet (Fig. 1 , 2). Die Bohrung 7 geht dabei in gedachter Verlängerung schräg unter eine komplementäre Mitnehmerfläche 9 (Fig. 1 ) eines bügelartigen Querbereichs 19 des Außenhebels 3 hinter dem Ende des Innenhebels 4. Der schräge Verlauf der Bohrung 7 mit Koppelkolben 8 verringert ggf. die Bauhöhe des gesamten Schlepphebels 1 bzw. kann der Querbereich 19 des Außenhebels 3 ausreichend „hoch" gebaut werden.Above the contact surface 6 extends in both embodiments, a longitudinally and obliquely arranged bore 7 for a coupling piston 8. This bore 7 consists of two sections 13, 14, of which according to Fig. 1, the section 13 (inside) has a smaller diameter than the section 14 (outside) and according to FIG. 2, the section 13 has a larger diameter than the section 14. Between the two sections 13, 14, an annular collar 18 is formed, on which the stepped coupling piston 8 with its annular region 17 finds a stop in one direction (FIGS. 1, 2). The bore 7 extends in an imaginary extension obliquely under a complementary driver surface 9 (Fig. 1) of a bow-shaped transverse region 19 of the outer lever 3 behind the end of the inner lever 4. The oblique course of the bore 7 with coupling piston 8 possibly reduces the overall height of the entire follower lever 1 or the transverse region 19 of the outer lever 3 can be built sufficiently "high".
Zu erkennen ist in Fig. 1 zudem, dass der Koppelkolben 8 in Entkoppelrichtung über die Kraft wenigstens einer Schraubendruckfeder 20 und in Koppelrichtung über aus der Kontaktfläche 6 heranleitbares Hydraulikmittel verschiebbar ist. Die Schraubendruckfeder 20 wirkt einenends gegen einen Teller 10. Letzterer ist Bestandteil einer durch die Schraubendruckfeder 20 geführten, koppelfernen Verlängerung des Koppelkolbens 8. Anderenends wirkt die Schraubendruckfeder 20 gegen eine koppelseitige Anschlagfläche des Innenhebels 4. Das Hydraulikmittel ist aus der Kontaktfläche 6 über einen Direktkanal 23 in einen Ringraum 24 vor dem Ringbereich 17 des Koppelkolbens 8 leitbar. Nach Fig. 2 hat der Koppelkolben 8 im Bereich seiner Innenstirn 21 ein Sackloch 28. In diesem ist die Schraubendruckfeder 20 einenends abgestützt. Diese wirkt anderenends gegen einen separaten Anschlagring 22. Der Anschlagring 22 erfährt eine axiale Wegbegrenzung nach außen an einem Sicherungsele- ment 25 wie einem Sprengring, der in einer nicht näher bezeichneten Ringnut der Bohrung 7 verläuft.It can also be seen in FIG. 1 that the coupling piston 8 is displaceable in the decoupling direction by way of the force of at least one helical compression spring 20 and in the coupling direction via hydraulic medium which can be led out of the contact surface 6. The latter is part of a guided by the helical compression spring 20, remote coupling extension of the coupling piston 8. The other end, the helical compression spring 20 acts against a coupling-side stop surface of the inner lever 4. The hydraulic fluid is from the contact surface 6 via a direct channel 23rd in an annular space 24 in front of the annular region 17 of the coupling piston 8 can be conducted. 2, the coupling piston 8 in the region of its inner end 21 has a blind hole 28. In this, the helical compression spring 20 is supported at one end. This works at the other end against a separate stop ring 22. The stop ring 22 experiences an axial travel limit to the outside on a Sicherungsele- element 25 as a snap ring which extends in an unspecified annular groove of the bore 7.
Dargestellt ist in Fig. 1 die Entkoppelposition und in Fig. 2 die Koppelposition des Koppelkolbens 8. Über den letztgenannten Anschlagring 22 nach Fig. 2 kann der Koppelkolben 8 zudem eine Anschlagposition in Entkoppelrichtung erfahren. Auf zusätzliche Anschlagbuchsen, wie im Stand der Technik, kann somit verzichtet werden. Zudem ist bei Fig. 2 aufgrund der abschnittsweisen Anordnung der Schraubendruckfeder 20 in dem Sackloch 28 des Koppelkolbens 8 ein Beitrag für einen axial relativ kurz bauenden Koppelmechanismus geleistet.2 shows the coupling position of the coupling piston 8. About the latter stop ring 22 of FIG. 2, the coupling piston 8 also learn a stop position in Entkoppelrichtung. Additional stop bushings, as in the prior art, can thus be dispensed with. In addition, in Fig. 2 due to the sectional arrangement of the helical compression spring 20 in the blind hole 28 of the coupling piston 8 made a contribution to an axially relatively short-built coupling mechanism.
Aus Fig. 1 ist außerdem entnehmbar, dass auf Oberseiten 11 der Arme 2 des Außenhebels 3 eine Anlauffläche 12 für je einen Großhubnocken vorliegt (dargestellt ist lediglich ein Arm 2). Eine Oberseite des Innenhebels 4 ist bspw. von einem Niedrighubnocken beaufschlagbar. Auf beiden Oberseiten 11 können wahlweise Rollen oder Gleitflächen appliziert sein. From Fig. 1 can also be seen that on top 11 of the arms 2 of the outer lever 3, a contact surface 12 is present for each one Großhubnocken (shown is only one arm 2). An upper side of the inner lever 4 is, for example, acted upon by a Niedrighubnocken. On both tops 11 can optionally be applied rollers or sliding surfaces.
Liste der BezugszahlenList of reference numbers
1 ) Schlepphebel1) drag lever
2) Arm 3) Außenhebel2) arm 3) outside lever
4) Innenhebel4) Inner lever
5) Unterseite5) bottom
6) Kontaktfläche6) contact surface
7) Bohrung 8) Koppelkolben7) bore 8) coupling piston
9) Mitnehmerfläche 10)Teller 11 )Oberseite 12)Anlauffläche 13)Abschnitt9) driving surface 10) plate 11) top 12) contact surface 13) section
14)Abschnitt 15)Mantelbereich 16)Mantelbereich 17)Ringbereich 18)Ringkragen14) Section 15) Sheath region 16) Sheath region 17) Ring region 18) Ring collar
19)Querbereich 20)Schraubendruckfeder 21 )lnnenstirn 22)Anschlaghng 23)Direktkanal19) transverse region 20) helical compression spring 21) inner end 22) stop 23) direct channel
24)Ringraum 25)Sicherungselement 26)nicht vergeben 27)nicht vergeben 28)Sackloch 24) annulus 25) securing element 26) not assigned 27) not allocated 28) Blind hole

Claims

Patentansprüche claims
1. Schaltbarer Schlepphebel (1 ) eines Ventiltriebs einer Brennkraftmaschi- ne, mit einem Außen- und einem zwischen dessen Armen (2) oder an dessen Arm verlaufenden Innenhebel (3, 4), wobei beide Hebel (3, 4) zueinander relativ verschwenkbeweglich sind und dem Innenhebel (4) einenends an seiner Unterseite (5) eine Kontaktfläche (6) für einen Kopf eines Abstützelements sowie anderenends eine Anlage für wenigstens ein Gaswechselventil immanent ist, wobei im Bereich der Kontaktfläche1. Switchable rocker arm (1) of a valve train of a Brennkraftmaschi- ne, with an outer and between the arms (2) or on the arm extending inner lever (3, 4), wherein both levers (3, 4) to each other are relatively pivotable and the inner lever (4) at one end on its underside (5) a contact surface (6) for a head of a support element and the other end a system for at least one gas exchange valve immanent, wherein in the region of the contact surface
(6) eine Bohrung (7) mit zumindest einem Koppelkolben (8) verläuft, der für einen Koppelfall der Hebel (3, 4) abschnittsweise mit einer Mitnehmerfläche (9) des Außenhebels (3) in Eingriff bringbar ist und wobei an einer Oberseite (11 ) zumindest des Außenhebels (3) wenigstens eine Anlauffläche (12) für einen Hubnocken appliziert ist, dadurch gekennzeichnet, dass die Bohrung (7) aus genau zwei gestuften Abschnitten (13, 14) dargestellt ist, in denen der Koppelkolben (8) mit zwei gestuften, komplementären Mantelbereichen (15, 16) verläuft, wobei eine Wegbegrenzung des Koppelkolbens (8) in eine Richtung über eine Anlage des- sen Ringbereichs (17) zwischen seinen Mantelbereichen (15, 16) an einem Ringkragen (18) zwischen den Abschnitten (13, 14) der Bohrung (7) dargestellt ist.(6) has a bore (7) with at least one coupling piston (8) which can be brought into engagement with a driver surface (9) of the outer lever (3) in sections for a coupling case of the levers (3, 4), and 11) at least the outer lever (3) at least one contact surface (12) is applied for a lifting cam, characterized in that the bore (7) from exactly two stepped sections (13, 14) is shown in which the coupling piston (8) two stepped, complementary cladding regions (15, 16) extending, wherein a Wegbegrenzung of the coupling piston (8) in one direction via an investment of its ring portion (17) between its lateral regions (15, 16) on an annular collar (18) between the sections (13, 14) of the bore (7) is shown.
2. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass der Abschnitt (14) der Bohrung (7) und der Mantelbereich (16) des Koppelkolbens (8) koppelseitig mit dem geringeren Durchmesser liegt, so dass eine Wegbegrenzung des Koppelkolbens (8) in Koppelrichtung darge- stellt ist [Fig. 2]. 2. rocker arm according to claim 1, characterized in that the portion (14) of the bore (7) and the jacket portion (16) of the coupling piston (8) coupled to the smaller diameter, so that a travel limit of the coupling piston (8) in the coupling direction is shown [Fig. 2].
3. Schlepphebel nach Anspruch 2, dadurch gekennzeichnet, dass der Koppelkolben (8) in Koppelrichtung über die Kraft wenigstens einer Schraubendruckfeder (20) und in Entkoppelrichtung über aus der Kontaktfläche (6) heranleitbares Hydraulikmittel verschiebbar ist, welche Schraubendruckfeder (20) einenends gegen eine Innenstirn (21 ) des3. rocker arm according to claim 2, characterized in that the coupling piston (8) in the coupling direction on the force of at least one helical compression spring (20) and in Entkoppelrichtung over from the contact surface (6) heranleitbares hydraulic fluid is displaceable, which helical compression spring (20) at one end against a Inner forehead (21) of the
Koppelkolbens (8) sowie anderenends gegen einen koppelfernen Anschlagring (22) in der Bohrung (7) wirkt, wobei das Hydraulikmittel aus der Kontaktfläche (6) über einen Direktkanal (23) in einen Ringraum (24) vor dem Ringbereich (17) des Koppelkolbens (8) leitbar ist.Coupling piston (8) and the other end against a coupling remote stop ring (22) in the bore (7) acts, the hydraulic fluid from the contact surface (6) via a direct channel (23) in an annular space (24) in front of the annular region (17) of the coupling piston (8) is conductive.
4. Schlepphebel nach Anspruch 3, dadurch gekennzeichnet, dass der Anschlagring (22) in koppelferne Richtung an einem in der Bohrung (7) verlaufenden Sicherungselement (25) wie einem Sprengring / einer Scheibe / einem Käppchen wegbegrenzt ist.4. drag lever according to claim 3, characterized in that the stop ring (22) is wegbegrenzt in a direction remote from the coupling on a in the bore (7) extending securing element (25) as a snap ring / a disc / a coping.
5. Schlepphebel nach Anspruch 3, dadurch gekennzeichnet, dass die Schraubendruckfeder (20) einenends in einem Sackloch (28) der Innen- stirn (21 ) des Koppelkolbens (8) einsitzt.5. drag lever according to claim 3, characterized in that the helical compression spring (20) at one end in a blind hole (28) of the inner end (21) of the coupling piston (8) is seated.
6. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass der Abschnitt (14) der Bohrung (7) und der Mantelbereich (16) des Koppel- kolbens (8) koppelseitig mit dem größeren Durchmesser liegt, so dass eine Wegbegrenzung des Koppelkolbens (8) in dessen Entkoppelrichtung vorliegt [Fig. 1].6. drag lever according to claim 1, characterized in that the portion (14) of the bore (7) and the jacket region (16) of the coupling piston (8) is coupled to the larger diameter, so that a travel limit of the coupling piston (8) is present in the Entkoppelrichtung [Fig. 1].
7. Schlepphebel nach Anspruch 6, dadurch gekennzeichnet, dass der Koppelkolben (8) in Entkoppelrichtung über die Kraft wenigstens einer Schraubendruckfeder (20) und in Koppelrichtung über aus der Kontakt- fläche (6) heranleitbares Hydraulikmittel verschiebbar ist, welche Schraubendruckfeder (20) einenends gegen einen Teller (10) wirkt, der Bestandteil einer durch die Schraubendruckfeder (20) geführten, koppelfernen Verlängerung des Koppelkolbens (8) ist, sowie anderenends ge- gen eine koppelseitige Anschlagfläche des Innenhebels (4) wirkt, wobei das Hydraulikmittel aus der Kontaktfläche (6) über einen Direktkanal (23) in einen Ringraum (24) vor dem Ringbereich (17) des Koppelkolbens (8) leitbar ist.7. drag lever according to claim 6, characterized in that the coupling piston (8) in Entkoppelrichtung on the force of at least one helical compression spring (20) and in the coupling direction over from the contact surface (6) hydraulic means which can be moved is displaceable, which helical compression spring (20) acts at one end against a plate (10) which is part of a coupling remote extension of the coupling piston (8) guided by the helical compression spring (20) and at the other end against a coupling side Stop surface of the inner lever (4) acts, wherein the hydraulic fluid from the contact surface (6) via a direct channel (23) in an annular space (24) in front of the annular region (17) of the coupling piston (8) can be conducted.
8. Schlepphebel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Bohrung (7) in einem Bereich oberhalb oder lateral der kalottenartig ausgebildeten Kontaktfläche (6) längs sowie entweder durchgehend oder als Sackbohrung im Innenhebel (4) verläuft, wobei die Mitnehmerfläche (9) entweder als schalenartige Unterseite an einem oder als Bohrung / Fenster in einem stirnseitigen Querbereich (19) am Außenhebel (3) endseitig hinter dem Innenhebel (4) vorliegt.8. drag lever according to one of the preceding claims, characterized in that the bore (7) in a region above or laterally of the dome-shaped contact surface (6) longitudinally and either continuously or as a blind bore in the inner lever (4), wherein the driving surface (9 ) is present either as a shell-like underside on one or as a bore / window in an end-side transverse region (19) on the outer lever (3) at the end behind the inner lever (4).
9. Schlepphebel nach Anspruch 8, dadurch gekennzeichnet, dass die Bohrung (7) derartig schräg zu einer zumindest in etwa orthogonal von Axiallinien des Gaswechselventils sowie Abstützelements bei Einbau geschnittenen Längsmittelebene des Außenhebels (3) angestellt ist, dass sie oder zumindest deren gedachte Verlängerung koppelfern ober- halb und koppelseitig unterhalb der Längsmittelebene liegt.9. drag lever according to claim 8, characterized in that the bore (7) is set obliquely to an at least approximately orthogonal axial lines of the gas exchange valve and support member during installation longitudinal median plane of the outer lever (3) that they or at least their imaginary extension koppelfern above and on the coupling side lies below the longitudinal center plane.
10. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, dass der Schlepphebel (1 ) als auf unterschiedliche Nockenhübe umschaltbar aus- gelegt ist, wobei hierfür die Oberseite (11 ) des Außenhebels (3) von wenigstens einem Großhubnocken und die Oberseite des Innenhebels (4) von einem Kleinhubnocken beaufschlagbar ist. 10. drag lever according to claim 1, characterized in that the drag lever (1) is designed as switchable to different cam strokes, in which case the top (11) of the outer lever (3) of at least one Großhubnocken and the top of the inner lever (4) can be acted upon by a small stroke cam.
PCT/EP2007/063265 2006-12-08 2007-12-04 Switchable cam lever of a valve drive of an internal combustion engine WO2008068251A1 (en)

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