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EP2102455B1 - Switchable support element for a valve drive of an internal combustion engine - Google Patents

Switchable support element for a valve drive of an internal combustion engine Download PDF

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Publication number
EP2102455B1
EP2102455B1 EP07847766.8A EP07847766A EP2102455B1 EP 2102455 B1 EP2102455 B1 EP 2102455B1 EP 07847766 A EP07847766 A EP 07847766A EP 2102455 B1 EP2102455 B1 EP 2102455B1
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EP
European Patent Office
Prior art keywords
housing
coupling means
inner element
supporting element
element according
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.)
Not-in-force
Application number
EP07847766.8A
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German (de)
French (fr)
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EP2102455A1 (en
Inventor
Bodo RÖRIG
Joachim Seitz
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
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Schaeffler Technologies AG and Co 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.)
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Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2102455A1 publication Critical patent/EP2102455A1/en
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Publication of EP2102455B1 publication Critical patent/EP2102455B1/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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L2307/00—Preventing the rotation of tappets

Definitions

  • the invention relates to a switchable supporting element for a valve train of an internal combustion engine, with a housing which can be arranged via its outer casing in a receptacle of the internal combustion engine and in the bore an axially movable, with its head an edge of the housing superior inner element extends, wherein the support element coupling means are selectively associated with the housing for selectively coupling the inner member in its axially extended position, which inner member is acted upon from the housing by at least one lost-motion spring.
  • this object is achieved in that at least one slide is provided as a coupling means, which is positioned in the decoupling case in a radially or secant extending guide of the housing and, starting from its radially inner end, a flattened top is immanent over which he im Coupling case with a flattened bottom of a recess in the outer shell of the inner member is engageable.
  • the recess of the inner member is formed either as a transverse slot with secant-even slot bottom or ring segment / sickle-like in the outer jacket of the inner member on the side of the respective slider as coupling means. Between inner element and housing an anti-rotation is arranged.
  • a coupling means a ring segment or a sickle-like design in question, which is also intended to a circumferential or partially circumferential groove on the outer surface of the inner element for the coupling case.
  • a return displacement of the slide in Entkoppelraum completely in the leadership of the housing is advantageously provided by hydraulic means. This can be passed through an annular groove on the outer surface of the housing and at least one transverse bore frontally inside the corresponding slide.
  • a lost-motion spring 9 which is designed as a spring assembly.
  • the coupling means 8 are shown in their coupling status ( Fig. 1 ), wherein the flat tops 12 communicate with flat bottoms 13 of corresponding recesses 14 in the outer shell 15 of the inner member 6.
  • the recesses 14 are, as best of FIG. 3 can be seen, shown as transverse slots with secant-even slot bottom 16.
  • FIGS. 2, 3 reveal FIGS. 2, 3 in that the inner element 6 is held in relation to the housing 2 by means of a pin-like anti-rotation device 21.
  • This anti-rotation 21 extends in a fixed manner in a recess 22 in the housing 2.
  • the anti-rotation 21 is, starting from its radially inner end face 24, depending on a flattened bottom and top 25, 26 immanent.
  • the inner element 6 experiences a travel limit in the two directions of travel, wherein optionally in the axially extended state a coupling play of the coupling means 8 can be displayed. Due to the latter rotation, a secure position assignment of the slider is created as a coupling means 8 with respect to their recesses 14.
  • a return displacement of the slide as coupling means 8 in Entkoppelraum is provided via hydraulic means.
  • an annular groove 38 from which two opposite transverse bores 39 are guided through the housing 2, of which the hydraulic fluid can be conducted in an annular space in front of the radially inner forehead 11 of the slide as coupling means 8.
  • the radially inner forehead 11 of the slide are designed to be spherical as a coupling means 8, so that a "good" Herantechnisch the hydraulic fluid is ensured.
  • the illustrated housing 2 may be solid or formed as a deep-drawn or extruded lightweight component.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft ein schaltbares Abstützelement für einen Ventiltrieb einer Brennkraftmaschine, mit einem Gehäuse, das über seinen Außenmantel in einer Aufnahme der Brennkraftmaschine anordenbar ist und in dessen Bohrung ein axial bewegliches, mit seinem Kopf einen Rand des Gehäuses überragendes Innenelement verläuft, wobei dem Abstützelement Koppelmittel zum wahlweisen Koppeln des Innenelements in dessen axial ausgefahrener Position mit dem Gehäuse zugeordnet sind, welches Innenelement aus dem Gehäuse heraus durch wenigstens eine Lost-Motion-Feder beaufschlagt ist.The invention relates to a switchable supporting element for a valve train of an internal combustion engine, with a housing which can be arranged via its outer casing in a receptacle of the internal combustion engine and in the bore an axially movable, with its head an edge of the housing superior inner element extends, wherein the support element coupling means are selectively associated with the housing for selectively coupling the inner member in its axially extended position, which inner member is acted upon from the housing by at least one lost-motion spring.

Hintergrund der ErfindungBackground of the invention

Ein derartiges Abstützelement, hier hydraulischer Bauart, geht aus der als gattungsbildend betrachteten EP 1 411 214 A2 hervor. Nachteilig ist insbesondere dessen relativ große Bauhöhe, hervorgerufen u. a. durch die übereinander geschachtelte Anordnung von Lost-Motion-Feder, Koppelmechanismus und Hydraulikeinheit. Außerdem wird festgestellt, dass sich die im Innenelement angeordneten Kolben als Koppelmittel im Falle einer gewünschten Demontage (beispielsweise zur Einstellung des Koppelspiels) nur erschwert entfernen lassen.Such a support element, here hydraulic design, goes out of the regarded as generic EP 1 411 214 A2 out. A particular disadvantage is its relatively large height, caused inter alia by the superposed arrangement of Lost-motion spring, coupling mechanism and hydraulic unit. In addition, it is found that the piston arranged in the inner element can be removed as a coupling means in the case of a desired disassembly (for example, for adjusting the coupling play) only with difficulty.

Außerdem sind Lösungen vorbekannt, bei denen ein entsprechender Schieber als Koppelmittel lateral im Zylinderkopf angeordnet und im Koppelfall in eine entsprechende Eingriffsfläche des Abstützelements verlagerbar ist. Der Fachmann erkennt, dass hier aufwändige Änderungen am Zylinderkopfdesign erforderlich sind und dass eine derartige Vorrichtung seitlich unnötig viel Bauraum benötigt.In addition, solutions are previously known in which a corresponding slide is arranged as a coupling means laterally in the cylinder head and in the coupling case in a corresponding engagement surface of the support element is displaced. Of the A person skilled in the art recognizes that costly changes to the cylinder head design are required here and that such a device requires an unnecessary amount of space laterally.

Ein abschaltbares Abstützelement mit einem Gehäuse und einem in diesem in einer Bohrung längsbeweglich angeordneten Innenelement ist in DE 10 2005 003 745 A1 gezeigt. Im Gehäuse ist ein Kolben in einer Hülse verschiebbar angeordnet und zum Koppeln in eine Aufnahme am Innenelement verlagerbar und zum Entkoppeln in der Aufnahme mit Hydraulikmittel beaufschlagbar.A disconnectable support element with a housing and a longitudinally movable therein in a bore inner element is in DE 10 2005 003 745 A1 shown. In the housing, a piston is slidably disposed in a sleeve and for coupling in a receptacle on the inner element displaceable and acted upon for decoupling in the receptacle with hydraulic fluid.

In US 5 875 748 A ist eine Ventiltriebseinrichtung für eine Verbrennungskraftmaschine mit einem Schaltmechanismus beschrieben, der in ein Abstützelement für einen Nockenfolger aufgenommen ist. Das Abstützelement weist ein zylindrisches Gehäuse mit einem in diesem axial beweglich angeordneten Innenelement auf. Der Schaltmechanismus umfasst Koppelmittel, die im Gehäuse in radialer Richtung in einer ersten Bohrungsanordnung verschiebbar angeordnet und in der Nocken-Grundkreisphase in eine korrespondierende zweite Bohrungsanordnung am Innenelement zum Koppeln von Gehäuse und Innenelement verlagerbar sind.In US Pat. No. 5,875,748 a valve drive device for an internal combustion engine is described with a switching mechanism which is accommodated in a support member for a cam follower. The support element has a cylindrical housing with an axially movable in this inner element. The switching mechanism comprises coupling means, which are arranged displaceably in the housing in the radial direction in a first bore arrangement and are displaceable in the cam base circle phase in a corresponding second bore arrangement on the inner element for coupling the housing and inner element.

EP 1 143 120 A2 zeigt eine hydraulische Ventilspielausgleichseinrichtung mit einem Gehäuseelement und einer in diesem beweglich angeordneten Kolbenanordnung. Das Gehäuseelement weist eine Öffnung auf, in der ein zylindrisches Element angeordnet ist, das radial in eine Öffnung an der Kolbenanordnung hineinreicht, so dass diese an einer Verdrehung gegenüber dem Gehäuseelement im Wesentlichen gehindert ist. EP 1 143 120 A2 shows a hydraulic valve lash adjuster with a housing member and a movably arranged in this piston assembly. The housing member has an opening in which a cylindrical member is arranged which extends radially into an opening on the piston assembly, so that it is prevented from rotating relative to the housing member substantially.

Die Ventilspielausgleichsvorrichtung mit einem Gehäuseelement und einer in diesem beweglich angeordneten Kolbenanordnung gemäß EP 1 544 422 A1 weist ein Verriegelungsglied auf, das zwischen einer verriegelten und einer entriegelten Position verschiebbar ist, in der die Kolbenanordnung in dem Gehäuseelement frei beweglich ist. Dabei umfasst die Ventilspielausgleichsvorrichtung ein Federelement, das das Verriegelungsglied in die verriegelte oder in die entriegelte Position vorspannt, und ein steuerbares Betätigungsglied zum Verschieben des Verriegelungsglieds in die ent- bzw. verriegelte Position.The valve lash adjuster with a housing member and a movably arranged in this piston assembly according to EP 1 544 422 A1 has a locking member which is displaceable between a locked and an unlocked position in which the piston assembly is freely movable in the housing member. In this case, the valve clearance compensation device comprises a spring element, which is the locking member biased into the locked or in the unlocked position, and a controllable actuator for displacing the locking member in the locked or locked position.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, ein Abstützelement der vorgenannten Gattung zu schaffen, bei dem die zitierten Nachteile beseitigt sind.The object of the invention is therefore to provide a support element of the aforementioned type, in which the cited disadvantages are eliminated.

Lösung der AufgabeSolution of the task

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass als Koppelmittel wenigstens ein Schieber vorgesehen ist, der im Entkoppelfall in einer radial oder sekantenartig verlaufenden Führung des Gehäuses positioniert ist und dem, ausgehend von seiner radial inneren Stirn, eine abgeflachte Oberseite immanent ist, über die er im Koppelfall mit einer abgeflachten Unterseite einer Ausnehmung im Außenmantel des Innenelements in Eingriff bringbar ist. Hierbei ist die Ausnehmung des Innenelements entweder als Querschlitz mit sekantenartig-geradem Schlitzgrund oder ringsegmentartig/sichelartig im Außenmantel des Innenelements auf der Seite des jeweiligen Schiebers als Koppelmittel ausgebildet. Zwischen Innenelement und Gehäuse ist eine Verdrehsicherung angeordnet. Als Verdrehsicherung ist ein Stift vorgesehen, der in einer Ausnehmung des Gehäuses befestigt ist und mit einer Längsaussparung am Innenelement kommuniziert. Der Stift weist eine von seiner radial inneren Stirnseite ausgehende, abgeflachte Unter- und Oberseite auf, die als beidendige Höhenanschläge mit gegenüberliegenden Anschlagflächen der Längsaussparung am Innenelement kommunizieren, wobei in der axial ausgefahrenen Anschlagposition des Innenelements eine Lagezuordnung der Schieber als Koppelmittel zu den Ausnehmungen des Innenelements gewährleistet ist.According to the invention, this object is achieved in that at least one slide is provided as a coupling means, which is positioned in the decoupling case in a radially or secant extending guide of the housing and, starting from its radially inner end, a flattened top is immanent over which he im Coupling case with a flattened bottom of a recess in the outer shell of the inner member is engageable. Here, the recess of the inner member is formed either as a transverse slot with secant-even slot bottom or ring segment / sickle-like in the outer jacket of the inner member on the side of the respective slider as coupling means. Between inner element and housing an anti-rotation is arranged. As a rotation, a pin is provided which is fixed in a recess of the housing and communicates with a longitudinal recess on the inner element. The pin has an outgoing from its radially inner end face, flattened bottom and top, which communicate as both-end height stops with opposite stop surfaces of the longitudinal recess on the inner element, wherein in the axially extended stop position of the inner element, a positional assignment of the slider as a coupling means to the recesses of the inner element is guaranteed.

Hierdurch sind die vorgenannten Nachteile beseitigt. Das anmeldungsgemäße Abstützelement baut axial relativ niedrig und erfordert auch in radialer Richtung keinen oder nur einen geringfügig erhöhten Bauraum, wobei nicht mit den aufwändigen Änderungen im Zylinderkopfbereich zu rechnen ist, wie im beschreibungseinleitend zitierten Stand der Technik aufgeführt.As a result, the aforementioned disadvantages are eliminated. The application according to the support member builds axially relatively low and also requires in the radial direction no or only a slightly increased space, which is not to be expected with the costly changes in the cylinder head area, as listed in the introductory cited prior art.

Besonders vorteilhaft ist es, wenn das Abstützelement mit einer an sich bekannten hydraulischen Spielausgleichsvorrichtung versehen ist, wobei auch mechanische Spieleinstellvarianten denkbar und vorgesehen sind.It is particularly advantageous if the support element is provided with a hydraulic lash adjuster known per se, wherein also mechanical lash adjuster variants are conceivable and provided.

Der Erfindungsgedanke lässt sich zwar auch mit nur einem Schieber als Koppelmittel verwirklichen, jedoch ist es besonders vorteilhaft, wenn zwei sich diametral gegenüberliegende Schieber als Koppelmittel vorgesehen sind. Dabei ist insbesondere an kolbenartige Elemente gedacht, die, ausgehend von ihrer radial inneren Stirnseite, an ihrer Oberseite abgeflacht sind und gemäß einer besonders zweckmäßigen Fortbildung der Erfindung in eine Ausnehmung am Außenmantel des Innenelements eingreifen, welche Ausnehmung als Querschlitz mit sekantenartig-geradem Schlitzgrund dargestellt ist.Although the idea of the invention can be realized with only one slider as a coupling agent, but it is particularly advantageous if two diametrically opposed slide are provided as coupling means. It is particularly thought of piston-like elements which, starting from their radially inner end face, are flattened at their top and engage according to a particularly useful development of the invention in a recess on the outer surface of the inner element, which recess is shown as a transverse slot with secant-even slit bottom ,

Alternativ kommt je Schieber als Koppelmittel auch ein Ringsegment oder eine sichelartige Gestaltung infrage, wobei auch an eine umlaufende oder teilumlaufende Ringnut am Außenmantel des Innenelements für den Koppelfall gedacht ist.Alternatively comes per slider as a coupling means, a ring segment or a sickle-like design in question, which is also intended to a circumferential or partially circumferential groove on the outer surface of the inner element for the coupling case.

Selbstverständlich erschließen sich dem Fachmann an dieser Stelle noch weitere Ausbildungen der Koppelmittel. So können diese auch als Flachschieber o. dgl. ausgebildet sein. Ggf. ist auch eine Lösung denkbar und vorgesehen, bei der mehrere sternförmig umfangsverteilte Schieber als Koppelmittel im Gehäuse vorgesehen sind.Of course, further developments of the coupling means will become apparent to those skilled in the art at this point. So they can also be designed as a flat slide o. The like. Possibly. is also a solution conceivable and provided, in which a plurality of star-shaped circumferentially distributed slide are provided as coupling means in the housing.

Aufgrund der vorgeschlagenen abgeflachten Koppelstruktur ist mit lediglich geringen Flächenpressungen im Koppelbereich zu rechnen.Due to the proposed flattened coupling structure is expected only low surface pressures in the coupling region.

Als einfaches und bauraumsparendes Verlagerungsmittel für den oder die Schieber in Koppelrichtung ist es vorgeschlagen, am Außenmantel des Gehäuses wenigstens eine klammerähnliche Feder zu applizieren, deren Endstücke auf äußere Stirnseiten der Schieber als Koppelmittel einwirken. Gleichzeitig kann über diese klammerähnliche Feder eine Verdrehsicherung für den oder die Schieber als Koppelmittel dargestellt werden, indem bspw. die Endstücke jeweils mit einer radienhaften Einwölbung o. dgl. versehen sind, welche Einwölbung dann in einem entsprechend komplementären Längsschlitz an der äußeren Stirnseite des Koppelmittel einsitzt. Alternativ kann es vorgesehen sein, "glatte" Endstücke in einem Umfangsschlitz je Schieber verlaufen zu lassen.As a simple and space-saving displacement means for the slide or in the coupling direction, it is proposed to apply at least one clip-like spring on the outer jacket of the housing, whose End pieces act on the outer end faces of the slide as a coupling agent. At the same time can be represented as a coupling agent on this clip-like spring an anti-rotation device for the slide or by, for example, the end pieces are each provided with a radii curvature o. The like., Which concavity then sits in a correspondingly complementary longitudinal slot on the outer end side of the coupling means , Alternatively, it may be provided to allow "smooth" end pieces to run in a circumferential slot per slide.

Vorteilhaft ist es zudem, wenn zwischen Innenelement und Gehäuse eine Verdrehsicherung wie ein Stift oder eine Kugel vorgesehen ist. Ggf. kann in diesem Bereich auch über Anflachungen das Innenelement gegenüber dem Gehäuse verdrehgesichert sein.It is also advantageous if between the inner member and housing an anti-rotation such as a pin or a ball is provided. Possibly. In this area, the inner element can also be secured against rotation by being flattened against the housing.

Im Falle der Verwendung eines Stiftes kann dieser in zweckmäßiger Konkretisierung der Erfindung mit einer abgeflachten Unter- und Oberseite versehen sein, so dass beidendige Höhenanschläge für das Innenelement gegenüber dem Gehäuse vorliegen. Ggf. kann auch nur ein einenendiger Höhenanschlag dargestellt sein.In the case of the use of a pin this may be provided in expedient concretization of the invention with a flattened bottom and top, so that there are both-end height stops for the inner member relative to the housing. Possibly. can also be shown only a one-end height stop.

Außerdem ist es denkbar und vorgesehen, über den Stift als Verdrehsicherung ein Koppelspiel einzustellen, das an dieser Stelle nicht näher erläutert werden muss, wobei dann im Montageprozess Stifte vorgehalten werden, die hinsichtlich einer Höhe ihrer Unterseite gruppiert sind.In addition, it is conceivable and intended to set a coupling play on the pin as rotation, which does not need to be explained in detail here, in which case pins are held in the assembly process, which are grouped with respect to a height of their bottom.

Alternativ hierzu kann das Koppelspiel auch über hinsichtlich einer Höhe ihrer abgeflachten Oberseite gruppiert vorgehaltene Schieber eingestellt werden.Alternatively, the coupling play can also be adjusted by means of sliders grouped in relation to a height of their flattened top.

Eine Rückverlagerung der Schieber in Entkoppelrichtung vollständig in die Führung des Gehäuses ist zweckmäßigerweise über Hydraulikmittel vorgesehen. Dieses kann über eine Ringnut am Außenmantel des Gehäuses und wenigstens eine Querbohrung stirnseitig innen vor die entsprechenden Schieber geleitet werden.A return displacement of the slide in Entkoppelrichtung completely in the leadership of the housing is advantageously provided by hydraulic means. This can be passed through an annular groove on the outer surface of the housing and at least one transverse bore frontally inside the corresponding slide.

Als Lost-Motion-Feder ist wenigstens eine Schraubendruckfeder o. dgl. vorgeschlagen, die einenends gegen eine Unterseite des Innenelements und anderenends gegen einen Boden des Gehäuses wirkt. Zur weiteren Verringerung der Bauhöhe kann der Grund des Innenelements auch gestuft ausgebildet sein, so dass die Lost-Motion-Feder zumindest teilumfänglich einen Hochdruckraum im Innenelement umschließt.As a lost-motion spring, at least one helical compression spring o. The like. Proposed that acts at one end against a bottom of the inner member and the other end against a bottom of the housing. To further reduce the overall height of the bottom of the inner element may also be formed stepped, so that the lost-motion spring encloses at least partially a high-pressure chamber in the inner element.

Kurze Beschreibung der ZeichnungShort description of the drawing

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

Figur 1
einen Längsschnitt durch ein erfindungsgemäßes Abstützelement im Bereich dessen Schieber;
Figur 2
einen Längsschnitt nach Figur 1, um 90° gedreht mit Verdrehsicherung und die
Figur 3
einen vergrößert dargestellten Querschnitt durch das Abstützelement im Bereich der Schieber.
The invention is explained in more detail with reference to the drawing. Show it:
FIG. 1
a longitudinal section through an inventive support member in the region of the slide;
FIG. 2
a longitudinal section after FIG. 1 , rotated 90 ° with anti-rotation and the
FIG. 3
an enlarged cross-section through the support member in the region of the slide.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Dargestellt ist ein schaltbares Abstützelement 1 für einen Ventiltrieb einer Brennkraftmaschine. Dies besteht aus einem topfartigen Gehäuse 2, in dessen Bohrung 4 axial beweglich ein Innenelement 6 aufgenommen ist, das mit seinem Kopf 5 einen Rand 7 des Gehäuses 2 überragt. Der Kopf 5 ist Bestandteil eines in einer Bohrung 29 des Innenelements 6 eingebauten Druckkolbens 31 einer hydraulischen Spielausgleichsvorrichtung.Shown is a switchable support element 1 for a valve train of an internal combustion engine. This consists of a pot-like housing 2, in the bore 4 axially movable an inner element 6 is added, which projects beyond an edge 7 of the housing 2 with its head 5. The head 5 is part of a built-in a bore 29 of the inner member 6 pressure piston 31 a hydraulic lash adjuster.

Der letztgenannte Druckkolben 31 hat an seinem kopffernen Bereich einen Quersteg 32 mit einem Rückschlagventil 33, das sich in Richtung zu einem darunter liegenden Hochdruckraum 35 öffnet, der durch einen Grund 34 des Innenelements 6 in kopfferne Richtung begrenzt ist.The latter pressure piston 31 has at its head distant region a transverse web 32 with a check valve 33 which extends in the direction of a underlying high pressure chamber 35 opens, which is bounded by a base 34 of the inner member 6 in the direction of the head.

Zwischen dem Grund 34 des Innenelements 6 und einem Boden 37 des Gehäuses 2 verläuft eine Lost-Motion-Feder 9, die als Federpaket ausgeführt ist.Between the base 34 of the inner member 6 and a bottom 37 of the housing 2 extends a lost-motion spring 9, which is designed as a spring assembly.

Im Gehäuse 2 sind zwei sich diametral gegenüber liegende Schieber als Koppelmittel 8 appliziert. Diese sitzen in respektiven Führungen 10 des Gehäuses 2 und haben, ausgehend von ihrer jeweiligen radial inneren Stirn 11, gestufte Oberseiten 12.In the housing 2, two diametrically opposed slides are applied as coupling means 8. These sit in respective guides 10 of the housing 2 and have, starting from their respective radially inner end 11, stepped tops 12.

Die Koppelmittel 8 sind in ihrem Koppelstatus dargestellt (Fig. 1), wobei die flachen Oberseiten 12 mit flachen Unterseiten 13 von entsprechenden Ausnehmungen 14 im Außenmantel 15 des Innenelements 6 kommunizieren. Die Ausnehmungen 14 sind, wie am besten aus Figur 3 ersichtlich ist, als Querschlitze mit sekantenartig-geradem Schlitzgrund 16 dargestellt.The coupling means 8 are shown in their coupling status ( Fig. 1 ), wherein the flat tops 12 communicate with flat bottoms 13 of corresponding recesses 14 in the outer shell 15 of the inner member 6. The recesses 14 are, as best of FIG. 3 can be seen, shown as transverse slots with secant-even slot bottom 16.

Eine Verlagerung der Schieber als Koppelmittel 8 radial nach innen in ihre Koppelrichtung erfolgt über die Kraft einer bügelähnlichen, nach innen vorgespannten Feder 16a. Diese wirkt mit ihren Endstücken 18 auf äußere Stirnseiten 19 der Schieber als Koppelmittel 8 ein. Eine Führung und Verliersicherung für die Feder 16a ist über eine Umlaufnut 17 am Außenmantel 3 des Gehäuses 2 geschaffen, wobei die Endstücke 18 der Feder 16a, die hier radienhaft eingewölbt dargestellt sind, gleichzeitig formschlüssig in Längsschlitzen 20 der äußeren Stirnseiten 19 der Schieber als Koppelmittel 8 verlaufen. Somit ist eine einfache Verdrehsicherung für die Schieber als Koppelmittel 8 gegenüber ihren Führungen 10 geschaffen.A displacement of the slide as a coupling means 8 radially inwardly in its coupling direction via the force of a bow-like, inwardly biased spring 16a. This acts with its end pieces 18 on outer end faces 19 of the slide as a coupling means 8 a. A guide and captive for the spring 16a is provided via a circumferential groove 17 on the outer casing 3 of the housing 2, wherein the end pieces 18 of the spring 16a, which are shown here vaulted curved, at the same time form-fitting manner in longitudinal slots 20 of the outer end faces 19 of the slide as coupling means run. Thus, a simple rotation for the slide as a coupling means 8 is created with respect to their guides 10.

Gleichzeitig offenbaren die Figuren 2, 3, dass das Innenelement 6 über eine stiftartige Verdrehsicherung 21 gegenüber dem Gehäuse 2 gehalten ist. Diese Verdrehsicherung 21 verläuft ortsfest in einer Ausnehmung 22 im Gehäuse 2. Der Verdrehsicherung 21 ist, ausgehend von ihrer radial inneren Stirnseite 24, je eine abgeflachte Unter- und Oberseite 25, 26 immanent. Hierüber erfährt das Innenelement 6 eine Wegbegrenzung in dessen beide Verfahrrichtungen, wobei wahlweise auch im axial ausgefahrenen Zustand ein Koppelspiel der Koppelmittel 8 darstellbar ist. Aufgrund der letztgenannten Verdrehsicherung wird eine sichere Lagezuordnung der Schieber als Koppelmittel 8 gegenüber ihren Ausnehmungen 14 geschaffen.At the same time they reveal FIGS. 2, 3 in that the inner element 6 is held in relation to the housing 2 by means of a pin-like anti-rotation device 21. This anti-rotation 21 extends in a fixed manner in a recess 22 in the housing 2. The anti-rotation 21 is, starting from its radially inner end face 24, depending on a flattened bottom and top 25, 26 immanent. About this, the inner element 6 experiences a travel limit in the two directions of travel, wherein optionally in the axially extended state a coupling play of the coupling means 8 can be displayed. Due to the latter rotation, a secure position assignment of the slider is created as a coupling means 8 with respect to their recesses 14.

Eine Rückverlagerung der Schieber als Koppelmittel 8 in Entkoppelrichtung ist über Hydraulikmittel vorgesehen. Hierbei verläuft am Außenmantel 3 des Gehäuses 2 eine Ringnut 38, von der aus zwei sich gegenüber liegende Querbohrungen 39 durch das Gehäuse 2 geführt sind, von denen das Hydraulikmittel in einen Ringraum vor die radial inneren Stirnen 11 der Schieber als Koppelmittel 8 leitbar ist. Wie zu erkennen ist, sind die radial inneren Stirnen 11 der Schieber als Koppelmittel 8 ballig ausgeführt, so dass eine "gute" Heranleitung des Hydraulikmittels gewährleistet ist.A return displacement of the slide as coupling means 8 in Entkoppelrichtung is provided via hydraulic means. Here, on the outer casing 3 of the housing 2, an annular groove 38, from which two opposite transverse bores 39 are guided through the housing 2, of which the hydraulic fluid can be conducted in an annular space in front of the radially inner forehead 11 of the slide as coupling means 8. As can be seen, the radially inner forehead 11 of the slide are designed to be spherical as a coupling means 8, so that a "good" Heranleitung the hydraulic fluid is ensured.

Das dargestellte Gehäuse 2 kann massiv oder auch als tiefgezogenes bzw. fließgepresstes Leichtbauteil ausgebildet sein. Liste der Bezugszahlen 1) Abstützelement 31)Druckkolben 2) Gehäuse 32)Quersteg 3) Außenmantel 33) Rückschlagventil 4) Bohrung 34)Grund 5) Kopf 35) Hochdruckraum 6) Innenelement 36) Unterseite 7) Rand 37) Boden 8) Koppelmittel (Schieber) 38)Ringnut 9) Lost-Motion-Feder 39)Querbohrung 10)Führung 11)Stirn 12)Oberseite 13) Unterseite 14)Ausnehmung 15)Außenmantel 16)Schlitzgrund 16a)Feder 17)Umlaufnut 18) Endstück 19)äußere Stirnseite 20) Längsschlitz 21)Verdrehsicherung 22)Ausnehmung 23)Längsaussparung 24) innere Stirnseite 25) Unterseite 26) Oberseite 27)Anschlagfläche 28)Anschlagfläche 29)Bohrung 30)Vorratsraum The illustrated housing 2 may be solid or formed as a deep-drawn or extruded lightweight component. <b> List of Reference Numbers </ b> 1) support element 31) pressure piston 2) housing 32) transverse web 3) outer jacket 33) Check valve 4) bore 34) Base 5) head 35) high pressure room 6) inner element 36) bottom 7) edge 37) floor 8) coupling agent (slide) 38) annular groove 9) Lost motion spring 39) transverse bore 10) guide 11) end 12) top 13) bottom 14) recess 15) outer shell 16) slot base 16a) spring 17) circumferential groove 18) tail 19) outer face 20) longitudinal slot 21) anti-rotation 22) recess 23) longitudinal recess 24) inner end face 25) bottom 26) top 27) stop surface 28) stop surface 29) bore 30) reservoir

Claims (12)

  1. Switchable supporting element (1) for a valve train of an internal combustion engine, having a housing (2) which can be arranged via its outer shell (3) in a receptacle of the internal combustion engine, and in the bore (4) of which an axially movable inner element (6) which protrudes with its head (5) beyond an edge (7) of the housing (2) runs, the supporting element (1) being assigned coupling means (8) for selectively coupling the inner element (6) in its axially extended position to the housing (2), which inner element (6) is loaded out of the housing (2) by way of at least one lost-motion spring (9), characterized in that the coupling means (8) are configured as at least two slides which, in the decoupled case, are positioned in each case in a guide (10) of the housing (2), which guide (10) runs radially or in a secant-like manner, to which slides, starting from their radially inner end (11), a flattened upper side (12) is immanent, via which, in the coupled case, they can be brought into engagement with a flattened underside (13) of at least one recess (14) in the outer shell (15) of the inner element (6), the recess (14) of the inner element (6) either being configured as a transverse slot with a secant-like/straight slot bottom (16) or in an annular segment-like/crescent-like manner in the outer shell (15) of the inner element (6) on the side of the respective slide as coupling means (8), and an anti-rotation safeguard (21) being applied between the inner element (6) and the housing (2), and a pin being provided as anti-rotation safeguard (21), which pin is fastened in a recess (22) of the housing (2) and communicates with a longitudinal cut-out (23) on the inner element (6) and has a flattened underside and upper side (25, 26) which emanate from its radially inner end side (24) and, as vertical stops at both ends, communicate with opposite stop faces (27, 28) of the longitudinal cut-out (23) on the inner element (6), a positional assignment of the slides as coupling means (8) to their recesses (14) of the inner element (7) being produced in the case of the axially extended stop position of the inner element (6).
  2. Supporting element according to Claim 1, characterized in that the recess (14) of the inner element (6) is configured as a circumferential annular groove.
  3. Supporting element according to Claim 1, characterized in that precisely two slides which lie diametrically opposite one another are provided as coupling means (8) in the guide (10) of the housing (2).
  4. Supporting element according to Claim 1 or 3, characterized in that the respective slide as a coupling means (8) is configured as a piston, and in that its guide (10) in the housing (2) is configured as a bore, the flattened upper side (12) of which guide (10) is a constituent part of a step-like material clearance, starting from its radially inner end (11).
  5. Supporting element according to Claim 4, if referring back to Claim 3, characterized in that a displacement of the two slides as coupling means (8) in the coupling direction is produced via the force of at least one bracket-like or clip-like, inwardly prestressed spring (16a) which either bears against the outer shell (3) of the housing (2) or is guided in a circumferential groove (17) in the outer shell (3) of the housing (2) and acts with its end pieces (18) or regions of its inner shell on outer end sides (19) of the slides as coupling means (8).
  6. Supporting element according to Claim 5, characterized in that the end pieces (18) of the spring (16a) are seated with a region which is curved in a radius-like manner in longitudinal slots (20) of the outer end sides (19) of the slides as coupling means (8) for anti-rotation safeguard purposes.
  7. Supporting element according to Claim 1, characterized in that a setting of a coupling play is brought about via the pin as anti-rotation safeguard (21).
  8. Supporting element according to Claim 1, characterized in that a setting of a coupling play is brought about via the respective slide as coupling means (8).
  9. Supporting element according to Claim 1, characterized in that the supporting element (1) is provided with hydraulic play compensation.
  10. Supporting element according to Claim 9, characterized in that a pressure piston (31) which encloses a storage space (30) for hydraulic medium runs as a constituent part of the inner element (6) in a bore (29) of the inner element (6), which pressure piston (31) has the head (5), a check valve (33) running on a transverse land (32) of the pressure piston (31), which transverse land (32) is remote from the head, and a high pressure space (35) for the hydraulic medium being formed axially between the transverse land (32) and a bottom (34) of the inner element (6), which bottom (34) is remote from the head, and the recess (14) for the slide as coupling means (8) lying on the outer shell (15) of the inner element (6) at least in sections radially next to the high pressure space (35) or at a higher location.
  11. Supporting element according to Claim 1, characterized in that one or more compression coil springs are provided as lost-motion spring (9), which compression coil springs act at one end against an underside (36) of the inner element (6) and at the other end against a bottom (37) of the pot-like housing (2).
  12. Supporting element according to Claim 1, characterized in that a displacement of the at least one slide as coupling means (8) in the decoupling direction can be produced via a hydraulic medium, for the inflow of which an annular groove (38) or a cut-out such as a bore runs on the outer shell (3) of the housing (2) axially below the respective guide (10), from which the hydraulic medium can be conducted via at least one transverse bore (39) through the housing (2) into the recess (14) radially on the inside in front of the end (11) of the slide as coupling means (8).
EP07847766.8A 2007-01-18 2007-12-04 Switchable support element for a valve drive of an internal combustion engine Not-in-force EP2102455B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007002787A DE102007002787A1 (en) 2007-01-18 2007-01-18 Switchable support element for a valve train of an internal combustion engine
PCT/EP2007/063263 WO2008086913A1 (en) 2007-01-18 2007-12-04 Switchable support element for a valve drive of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2102455A1 EP2102455A1 (en) 2009-09-23
EP2102455B1 true EP2102455B1 (en) 2017-02-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07847766.8A Not-in-force EP2102455B1 (en) 2007-01-18 2007-12-04 Switchable support element for a valve drive of an internal combustion engine

Country Status (4)

Country Link
US (1) US8136495B2 (en)
EP (1) EP2102455B1 (en)
DE (1) DE102007002787A1 (en)
WO (1) WO2008086913A1 (en)

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DE102011080268A1 (en) * 2011-08-02 2013-02-07 Schaeffler Technologies AG & Co. KG Switchable valve drive member
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Also Published As

Publication number Publication date
US8136495B2 (en) 2012-03-20
DE102007002787A1 (en) 2008-07-24
WO2008086913A1 (en) 2008-07-24
US20100059001A1 (en) 2010-03-11
EP2102455A1 (en) 2009-09-23

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