Gebiet der ErfindungField of the invention
DieErfindung betrifft einen schaltbaren Schlepphebel eines Ventiltriebseiner Brennkraftmaschine, mit einem Außen- und einem zwischen dessenArmen oder an dessen Arm verlaufenden Innenhebel, wobei beide Hebelzueinander relativ verschwenkbeweglich sind und dem Innenhebel einenendsan seiner Unterseite eine Kontaktfläche für einen Kopf eines Abstützelementssowie anderenends eine Anlage fürwenigstens ein Gaswechselventil immanent ist, wobei im Bereich derKontaktflächeeine Bohrung mit zumindest einem Koppelkolben verläuft, derfür einenKoppelfall der Hebel abschnittsweise mit einer Mitnehmerfläche desAußenhebelsin Eingriff bringbar ist und wobei an einer Oberseite zumindestdes Außenhebelswenigstens eine Anlauffläche für einenHubnocken appliziert ist.TheThe invention relates to a switchable cam follower of a valve trainan internal combustion engine, with an outside and between thePoor or on the arm extending inner lever, both leverseach other are relatively pivotable and the inner lever one endon its underside a contact surface for a head of a support elementas well as the other end a plant forat least one gas exchange valve is intrinsic, being in the range ofcontact areaa bore extends with at least one coupling piston, thefor oneCoupling case of the lever sections with a driver surface of theoutside leveris engageable and wherein on an upper side at leastof the outer leverat least one contact surface for oneHub cam is applied.
Hintergrund der ErfindungBackground of the invention
DerartigeSchlepphebel sind der Fachwelt bekannt. In die jeweilige Bohrungfür denKoppelkolben ist endseitig eine Anschlagbuchse eingepresst. DurchLetztere verläuftein den Koppelkolben verlängernderRohrabschnitt, welcher außenin einen Tellerbereich übergeht.Der Koppelkolben erfährt über denTellerbereich an der Anschlagbuchse eine Wegbegrenzung in dessenKoppelrichtung. Die Buchse dient außerdem als einenendige Abstützung für die Schraubendruckfeder.Außerdemkann ein Innenstirnbereich der Buchse als Wegbegrenzung für den Koppelkolbenin dessen Entkoppelrichtung dienen.suchDrag levers are known in the art. Into the respective borefor theCoupling piston end of a stop bushing is pressed. ByThe latter runsa lengthening the coupling pistonPipe section, which outsidegoes into a plate area.The coupling piston learns about thePlate area at the stop bushing a Wegbegrenzung in theCoupling direction. The bush also serves as a single end support for the helical compression spring.Furthermorecan an inner end of the bush as a travel limit for the coupling pistonserve in its Entkoppelrichtung.
Nachteiligist es bei der vorgenannten Ausgestaltung, dass der Fertigungs-und Montageaufwand fürdie Buchse relativ hoch ist. So muss diese hinsichtlich ihrer Einpresskraftund ihres Weges genau definiert in die Bohrung für den Koppelkolben eingebrachtwerden. Somit ist dem Fachmann klar, dass in diesem Bereich eine äußerst genaueTolerierung bzw. Zupaarung erforderlich ist. Ein zu starkes Einpressender Buchse kann zu einer unerwünschtenMaterialverformung im Bohrungsbereich führen. Auch besteht die Gefahr,dass die Buchse sich währenddes Betriebs des Schlepphebels löstund es somit zu einem Totalausfall des Koppelmechanismus kommt.adverselyit is in the aforementioned embodiment that the manufacturingand assembly costs forthe socket is relatively high. So this must be in terms of their insertion forceand their path defined precisely introduced into the bore for the coupling pistonbecome. Thus, it is clear to those skilled in the art that in this area an extremely accurateToleration or Zupaarung is required. Too much pressingThe socket may become an undesirableMaterial deformation in the bore area lead. There is also the dangerthat the socket is duringthe operation of the cam lever triggersand thus it comes to a total failure of the coupling mechanism.
Aufgabe der ErfindungObject of the invention
Aufgabeder Erfindung ist es daher, einen Schlepphebel der vorgenanntenArt zu schaffen, bei welchem die zitierten Nachteile mit einfachenMitteln beseitigt sind.taskThe invention is therefore a drag lever of the aforementionedArt to create, in which the cited disadvantages with simpleFunds are eliminated.
Lösung der AufgabeSolution of the task
Erfindungsgemäß wird dieseAufgabe dadurch gelöst,dass die Bohrung aus genau zwei gestuften Abschnitten dargestelltist, in denen der Koppelkolben mit zwei gestuften, komplementären Mantelbereichenverläuft,wobei eine Wegbegrenzung des Koppelkolbens in eine Richtung über eineAnlage dessen Ringbereichs zwischen seinen Mantelbereichen an einemRingkragen zwischen den Abschnitten der Bohrung dargestellt ist.According to the invention thisTask solved bythat the hole is represented by exactly two stepped sectionsis, in which the coupling piston with two stepped, complementary jacket areasruns,wherein a travel limit of the coupling piston in one direction over aPlant the ring area between its lateral areas at oneRing collar is shown between the sections of the hole.
Zweckmäßige Konkretisierungender Erfindung sind Gegenstand der Unteransprüche, denen auch selbständig schutzfähige Maßnahmenimmanent sein können.Appropriate concretizationsThe invention are the subject of the dependent claims, which also independently protectable measurescan be immanent.
Somitliegt ein schaltbarer Schlepphebel vor, der im Bereich seines Koppelmechanismusdeutlich vereinfacht aufgebaut ist und der sich leicht montierenlässt.Es ist lediglich erforderlich, die Bohrung für den Koppelkolben aus besondersbevorzugt zwei gestuften Abschnitten darzustellen (ggf. sind auchmehr als zwei Stufen denkbar), in welchen dann der ebenfalls zweigestufteKoppelkolben verläuft.Durch die vorgenannte Anlage des Ringbereichs des Koppelkolbensan dem Ringkragen der Bohrung ist dessen Endposition in Koppel-oder Entkoppelrichtung sicher determiniert.ConsequentlyThere is a switchable drag lever in the area of its coupling mechanismhas a simpler structure and is easy to assembleleaves.It is only necessary, the bore for the coupling piston from particularpreferably two stepped sections represent (possibly alsomore than two stages conceivable), in which then also the two-tieredCoupling piston runs.By the aforementioned system of the ring portion of the coupling pistonon the annular collar of the bore is its end position in couplingor decoupling safely determined.
Ggf.kann die Bohrung in beide Richtungen einen Ringkragen besitzen,durch den die Bewegung des Koppelkolbens in beide Richtungen festlegbar ist.Auch könnender Ringbereich sowie der Ringkragen kegelförmig angestellt sein. Zweckmäßigerweise sollder Koppelkolben einteilig ausgebildet sein. Ggf. ist auch dessenmehrteilige Ausbildung denkbar und vorgesehen.Possibly.the bore can have a ring collar in both directions,by which the movement of the coupling piston can be fixed in both directions.Also canthe ring area and the ring collar be made cone-shaped. Appropriately, shouldthe coupling piston may be integrally formed. Possibly. is also hismulti-part training conceivable and planned.
Aufgrunddes Wegfalls der Anschlagbuchse aus dem Stand der Technik kann dergesamte Koppelmechanismus axial und ggf. auch radial kleiner bauen.by virtue ofthe omission of the stop bushing of the prior art, thebuild entire coupling mechanism axially and possibly also radially smaller.
Fertigungstechnischbesonders einfach ist es, die Bohrung längs durchgehend darzustellen.Die Mitnehmerflächedes im Entkoppelfall abschwenkenden Außenhebels kann beispielsweiseals schalenartige Unterseite oder als Bohrung ausgebildet sein, unteroder in die der Koppelkolben im Koppelfall einfährt.manufacturing technologyit is particularly easy to represent the bore longitudinally throughout.The driving surfacethe swiveling in the decoupling outer lever can, for examplebe designed as a shell-like bottom or as a bore, underor in which the coupling piston retracts in the coupling case.
Besondersbevorzugt ist es, wenn der Koppelkolben mit seiner Bohrung als sogenannter „Längsverriegler" ausgebildet ist.Ebenfalls besonders bevorzugt ist es, den Koppelkolben schräg unter dieMitnehmerflächedes Querbereichs des Außenhebelsfahren zu lassen. Ggf. kann der Koppelkolben auch quer verriegeln.Especiallyit is preferred if the coupling piston with its bore as sois called "Längsverriegler" is formed.Also particularly preferred is the coupling piston obliquely below theentrainingthe transverse area of the outer leverto drive. Possibly. The coupling piston can also lock transversely.
Dererfindungsgemäße Schlepphebelkann entweder als Ventilhubumschalter oder ggf. als Ventilhubabschalterausgebildet sein.Of theRocker arm according to the inventioncan either be used as a valve lift switch or possibly as a valve lift switchbe educated.
Esist des Weiteren vorgeschlagen, dass der Koppelkolben in dessenKoppelrichtung überDruckfederkraft beaufschlagt ist. Alternativ kann der Koppelkolbenauch in dessen Entkoppelrichtung über Druckfederkraft verlagertwerden. Eine Rückstellung desKoppelkolbens in die jeweils andere Richtung soll über Hydraulikmittelerfolgen, das aus dem Abstützelement über dieKontaktflächeheranleitbar ist. Aufgrund des Ringraums am Ringkragen kann auf separateMaßnahmenzur Schaffung eines Druckraums verzichtet werden.Itis further proposed that the coupling piston in theCoupling direction overCompression spring force is applied. Alternatively, the coupling pistonalso shifted in the Entkoppelrichtung about compression spring forcebecome. A provision of theCoupling piston in the other direction should via hydraulic meanstake place, from the support element on thecontact areacan be deduced. Due to the annulus on the ring collar can be on separateactivitiesto avoid the creation of a pressure chamber.
Umaxialen Bauraum zu sparen, kann bei einer Variante die wenigstenseine Druckfeder in einem Sackloch im Bereich der Innenstirn desKoppelkolbens verlaufen.AroundTo save axial space, in a variant that at leasta compression spring in a blind hole in the area of the inner front of theCoupling piston run.
Auchist es vorgeschlagen, die Druckfeder an einem Ende an einem separatenAnschlagring anzulegen, der in dem größeren Bohrungsabschnitt zumindestmittelbar befestigt ist. Zwar kann der Anschlagring unmittelbarin die Bohrung eingepresst sein, denkbar und vorgesehen ist es jedochauch, diesen übereinen einfachen Sprengring oder dergleichen in der Bohrung zu fixieren,welcher Sprengring in einer entsprechenden Ringnut der Bohrung verläuft.AlsoIt is proposed that the compression spring at one end to a separateStop ring to create, in the larger bore section at leastis indirectly attached. Although the stop ring can be immediatebe pressed into the hole, but conceivable and provided it isalso, this overto fix a simple snap ring or the like in the hole,which snap ring extends in a corresponding annular groove of the bore.
Kurze Beschreibung der ZeichnungShort description of the drawing
DieErfindung ist zweckmäßigerweiseanhand der Zeichnung nähererläutert.Es zeigtTheInvention is suitablycloser to the drawingexplained.It shows
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Dargestelltist in
DerSchlepphebel
Oberhalbder Kontaktfläche
Zuerkennen ist in
Nach
Dargestelltist in
Aus
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| DE102006057895ADE102006057895A1 (en) | 2006-12-08 | 2006-12-08 | Switchable drag lever of a valve train of an internal combustion engine | 
| PCT/EP2007/063265WO2008068251A1 (en) | 2006-12-08 | 2007-12-04 | Switchable cam lever of a valve drive of an internal combustion engine | 
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| DE102006057895ADE102006057895A1 (en) | 2006-12-08 | 2006-12-08 | Switchable drag lever of a valve train of an internal combustion engine | 
| Publication Number | Publication Date | 
|---|---|
| DE102006057895A1true DE102006057895A1 (en) | 2008-06-12 | 
| Application Number | Title | Priority Date | Filing Date | 
|---|---|---|---|
| DE102006057895ACeasedDE102006057895A1 (en) | 2006-12-08 | 2006-12-08 | Switchable drag lever of a valve train of an internal combustion engine | 
| Country | Link | 
|---|---|
| DE (1) | DE102006057895A1 (en) | 
| WO (1) | WO2008068251A1 (en) | 
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