EP2132419B1 - Switchable valve train part - Google Patents

Switchable valve train part Download PDF

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Publication number
EP2132419B1
EP2132419B1 EP08717684A EP08717684A EP2132419B1 EP 2132419 B1 EP2132419 B1 EP 2132419B1 EP 08717684 A EP08717684 A EP 08717684A EP 08717684 A EP08717684 A EP 08717684A EP 2132419 B1 EP2132419 B1 EP 2132419B1
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EP
European Patent Office
Prior art keywords
bore
coupling
drive part
valve
housing
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
EP08717684A
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German (de)
French (fr)
Other versions
EP2132419A1 (en
Inventor
Calin Petru Itoafa
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
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Publication of EP2132419A1 publication Critical patent/EP2132419A1/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
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L1/14—Tappets; Push rods
    • 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
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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 valve train part, with a hollow cylindrical housing, in the bore of which a relatively axially movable inner element extends with its outer jacket, wherein one of the components [inner element or housing] is at least one bore with at least one decoupling case extending therein-coupling piston immanent which bore leads in the direction of the other component and opens to an annular surface between the components, which coupling piston for a coupling case in sections with a cam surface of the other component is engageable and wherein a lost-motion spring means is provided, which the components in their Ausschieberaum acted upon each other away.
  • valve train part designed here as a bucket tappet, goes out of the class considered as generic DE 44 92 633 C1 out. Its coupling mechanism is located immediately below the floor area.
  • the prior art ram is constructed relatively complicated and thus its production proves to be unnecessarily costly.
  • the outer part is not formed symmetrically in the bottom area, since below the annular bottom guide holes for the coupling piston are applied.
  • the inner part is unnecessarily massive and complicated. Due to the aforementioned massive design, the oscillating valve train masses are disadvantageously increased.
  • the piston coupling to be recognized leads to a relatively large surface pressure in the coupling region, it can also lead to unnecessary edge wear in the retraction of the coupling piston.
  • the object of the invention is therefore to provide a switchable valve train part of the aforementioned type, in which the cited disadvantages are eliminated by simple means.
  • this object is achieved in that the respective coupling piston, starting from the driver face facing end, is provided on one axial side with a section-wise flattening, wherein the other component, only in the peripheral portion of the adjacent bore with the coupling piston in a component in his Bore / is provided on its outer jacket, with a merely sickle-like material release, on which a flat Axialstirn the driver surface for engagement of the flattening of the coupling piston for the coupling case is shown and where on the one hand, the coupling piston against the bore and on the other hand, the components to each other with a respectful rotation are provided.
  • switchable valve train part in which the cited disadvantages are effectively eliminated.
  • the scope of the invention relates in particular to switchable valve train parts such as bucket tappets, but is not limited thereto.
  • switchable roller or flat tappets and switchable supporting elements are included in the scope of protection. All elements can be provided with hydraulic or mechanical clearance compensation.
  • the idea of the invention relates to solutions with at least one coupling piston, but preferably two diametrically opposed coupling pistons should be applied.
  • solutions are also conceivable and provided with a coupling piston number> 2 (star-shaped arrangement).
  • the coupling pistons can sit in the housing and be displaced radially inwardly into their respective sickle-like material release on the outer jacket of the inner part for the coupling case (larger cam lift).
  • the coupling piston in the inner part for example, in a radial bore, extend and be displaced for the coupling case radially outward in the adjacent sickle-like material release of the bore of the housing. It is expedient if the coupling pistons are provided with a flattening on their corresponding axial side (coupling region), but this is not a condition.
  • the proposed respective sickle-like Materialoko ein can be generated in the case of their training in the bore of the housing, for example, by a simple Scheibenfräsvorgang. Also conceivable, however, are other machining operations such as screwing or a non-cutting introduction such as embossing, extrusion or picking.
  • the switchable valve train part is designed as a detachable or reversible tappet.
  • a bore for the preferably two coupling piston is especially thought of a radial bore, which can be easily displayed in one operation. Conceivable and However, it is also provided to apply a blind hole o. The like. For each coupling piston.
  • the coupling pistons are preferably acted upon by compression spring force radially outwards (in the case of their arrangement in the inner part).
  • compression spring force radially outwards (in the case of their arrangement in the inner part).
  • the respective sickle-like material release weakens only slightly the wall thickness, so that it can be dispensed with necessary stiffening measures such as in a Ringnutkopplung in the prior art.
  • necessary stiffening measures such as in a Ringnutkopplung in the prior art.
  • the skilled artisan will recognize that due to the omission of the annular groove and shortened hydraulic fluid paths are present.
  • the coupling pistons in the case of their training with a flattening for a "face-to-face” contact with the corresponding mating surface of the sickle-like formation, against rotation must be secured against their bore.
  • the coupling piston can also be secured against rotation by a protruding into the radial bore pin.
  • the inner part thin-walled / pipe-like form, the radial bore with the coupling piston is part of a simple crosspiece.
  • the valve drive part 1 consists of a hollow cylindrical housing 2, which can be arranged in an oscillating manner via its thin-walled shirt 21 in a receptacle of the internal combustion engine.
  • the shirt 21 extends from an outer edge 20 of a ring-like bottom 19 in cam-distant direction. From an inner edge 22 of the bottom 19 is a projection 23 away.
  • This has a bore 3, in which a contrast axially movable, thin-walled / tubular-like inner element 4 is added.
  • the inner element 4 has no cam contact, so that the switchable valve drive part 1 is present as a shutdown element.
  • a bore 6 which is present here as a radial bore.
  • this bore 6 are located in the decoupling two coupling piston 7 diametrically opposite. These are urged radially outwards (coupling direction) via the force of a helical compression spring acting against their inner forehead 17 as spring means 18.
  • FIG. 1 discloses the coupling state of the valve train part 1, in which the coupling piston 7, partially extended radially outward, with a cam surface 9 in the bore 3 of the housing 2 are engaged.
  • This driver surface 9 is represented by an upper flat Axialstirn a sickle-like material release 14, against which the respective flattening 13 of the coupling piston 7 in the coupling case.
  • the material release 14 can be generated, for example, with a retractable into the bore 3 of the housing 2 simple disc milling cutter (see also FIG. 2 ).
  • the bore 3 of the housing 2 is part of the hollow-cylindrical projection 23 extending from the inner edge 22 of the bottom 19 of the housing 2 in the direction away from the cam.
  • the housing 2 has in its interior a largely fitting, thin-walled element 25 as a sheet metal part.
  • the hydraulic fluid is further directed through a shirt side formed in the element 25 riser channel 27 in the bottom direction.
  • the hydraulic fluid is further directed downwards via an axial channel 31, which runs between an outer jacket 30 of the attachment 23 and the region of the element 25 located there.
  • an annular channel 32 is formed radially in front of the Materialoko einen 14, which is in communication with the axial channel 31.
  • An annular surface 8 between the components 2, 4 is overlapped by a rotation lock 16. This sits in a recess 34 in the outer jacket 5 of the inner member 4 and is formed as a rolling element. Radially outward, the anti-rotation device 16 (rolling elements) engages in a corresponding longitudinal groove 35 of the bore 3 of the projection 23.
  • This is designed as a simple securing element as a snap ring which extends in an annular groove 36 on the outer jacket 5 of the inner member 4 and in the region of the coupling piston 7 lies on the flattened portions 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Valve Device For Special Equipments (AREA)
  • Water Treatment By Sorption (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

The invention relates to a switchable valve train part (1) such as a bucket tappet, comprising a housing (2) in the bore (3) of which an inner element (4) runs that is axially movable relative to said bore, said inner element comprising a radially continuous bore (6) comprising two coupler pistons (7) located opposite one another that, in order to create a coupled state, may be brought into engagement in sections with a respective crescent-shaped material clearance (14) in the bore (3) of the housing (2).

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft ein schaltbares Ventiltriebsteil, mit einem hohlzylindrischen Gehäuse, in dessen Bohrung ein demgegenüber relativ axial bewegliches Innenelement mit seinem Außenmantel verläuft, wobei einem der Bauteile [Innenelement oder Gehäuse] wenigstens eine Bohrung mit zumindest einem im Entkoppelfall darin verlaufenden-Koppelkolben immanent ist, welche Bohrung in Richtung zum anderen Bauteil führt und an eine Ringfläche zwischen den Bauteilen mündet, welcher Koppelkolben für einen Koppelfall abschnittsweise mit einer Mitnehmerfläche des anderen Bauteils in Eingriff bringbar ist und wobei ein Lost-Motion-Federmittel vorgesehen ist, das die Bauteile in deren Ausschieberichtung voneinander weg beaufschlagt.The invention relates to a switchable valve train part, with a hollow cylindrical housing, in the bore of which a relatively axially movable inner element extends with its outer jacket, wherein one of the components [inner element or housing] is at least one bore with at least one decoupling case extending therein-coupling piston immanent which bore leads in the direction of the other component and opens to an annular surface between the components, which coupling piston for a coupling case in sections with a cam surface of the other component is engageable and wherein a lost-motion spring means is provided, which the components in their Ausschieberichtung acted upon each other away.

Hintergrund der ErfindungBackground of the invention

Ein derartiges Ventiltriebsteil, hier als Tassenstößel ausgebildet, geht aus der als gattungsbildend betrachteten DE 44 92 633 C1 hervor. Dessen Koppelmechanismus ist unmittelbar unterhalb des Bodenbereichs angeordnet. Der Fachmann erkennt, dass der vorbekannte Stößel relativ kompliziert aufgebaut ist und sich dessen Herstellung somit als unnötig kostenaufwändig erweist. Beispielsweise ist das Außenteil im Bodenbereich nicht symmetrisch ausgebildet, da unterhalb des ringförmigen Bodens Führungsbohrungen für die Koppelkolben appliziert sind. Auch ist das Innenteil unnötig massiv und kompliziert dargestellt. Aufgrund der vorgenannten massiven Ausbildung sind die oszillierenden Ventiltriebsmassen nachteilig erhöht. Die zu erkennende Kolbenkopplung führt zu einer relativ großen Flächenpressung im Koppelbereich, auch kann es zu unnötigem Kantenverschleiß im Einfahrbereich der Koppelkolben kommen.Such a valve train part, designed here as a bucket tappet, goes out of the class considered as generic DE 44 92 633 C1 out. Its coupling mechanism is located immediately below the floor area. The skilled artisan will recognize that the prior art ram is constructed relatively complicated and thus its production proves to be unnecessarily costly. For example, the outer part is not formed symmetrically in the bottom area, since below the annular bottom guide holes for the coupling piston are applied. Also, the inner part is unnecessarily massive and complicated. Due to the aforementioned massive design, the oscillating valve train masses are disadvantageously increased. The piston coupling to be recognized leads to a relatively large surface pressure in the coupling region, it can also lead to unnecessary edge wear in the retraction of the coupling piston.

Zudem sind aus dem älteren Stand der Technik Lösungen vorbekannt, bei denen die Koppelkolben im Koppelfall in eine stirnseitig angrenzende, allumlaufende Ringnut des jeweils anderen Bauteils einfahren. Die Ringnut schwächt zum einen das Material, so dass ggf. in diesem Bereich stärker dimensioniert werden muss. Zum anderen liegen aufgrund der Ringnut, durch welches Hydraulikmittel stirnseitig vor den oder die Koppelkolben geleitet wird, relativ lange Hydraulikmittelwege vor. Dies kann zu unerwünscht langen Schaltzeiten bzw. Fehlschaltungen innerhalb des zur Verfügung stehenden Zeitfensters (Grundkreis) führen.In addition, prior art solutions are known from the prior art, in which the coupling piston retract in the coupling case in a frontally adjacent, all-round annular groove of the other component. On the one hand, the annular groove weakens the material, so that possibly larger dimensions have to be applied in this area. On the other hand, because of the annular groove, through which the hydraulic fluid is conducted in front of the coupling piston or pistons, relatively long hydraulic fluid paths are present. This can lead to undesirably long switching times or faulty circuits within the available time window (base circle).

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, ein schaltbares Ventiltriebsteil der vorgenannten Art zu schaffen, bei dem die zitierten Nachteile mit einfachen Mitteln beseitigt sind.The object of the invention is therefore to provide a switchable valve train part 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 der jeweilige Koppelkolben, ausgehend von dessen der Mitnehmerfläche zugewandter Stirn, an einer Axialseite mit einer abschnittsweisen Abflachung versehen ist, wobei das andere Bauteil, lediglich im Umfangsabschnitt der angrenzenden Bohrung mit dem Koppelkolben im einen Bauteil, in seiner Bohrung / an seinem Außenmantel, mit einer lediglich sichelartigen Materialfreistellung versehen ist, an deren einer flachen Axialstirn die Mitnehmerfläche für einen Eingriff der Abflachung des Koppelkolbens für den Koppelfall dargestellt ist und wobei einerseits der Koppelkolben gegenüber dessen Bohrung und andererseits die Bauteile zueinander mit einer respektiven Rotationssicherung versehen sind.According to the invention, this object is achieved in that the respective coupling piston, starting from the driver face facing end, is provided on one axial side with a section-wise flattening, wherein the other component, only in the peripheral portion of the adjacent bore with the coupling piston in a component in his Bore / is provided on its outer jacket, with a merely sickle-like material release, on which a flat Axialstirn the driver surface for engagement of the flattening of the coupling piston for the coupling case is shown and where on the one hand, the coupling piston against the bore and on the other hand, the components to each other with a respectful rotation are provided.

Somit liegt ein schaltbares Ventiltriebsteil vor, bei dem die zitierten Nachteile wirkungsvoll beseitigt sind. Der Schutzbereich der Erfindung bezieht sich insbesondere auf schaltbare Ventiltriebsteile wie Tassenstößel, ist jedoch nicht hierauf beschränkt. Gleichermaßen sind vom Schutzbereich schaltbare Rollen- oder Flachstößel und schaltbare Abstützelemente mit umfasst. Sämtliche Elemente können mit hydraulischem oder mechanischem Spielausgleich versehen sein.Thus, there is a switchable valve train part in which the cited disadvantages are effectively eliminated. The scope of the invention relates in particular to switchable valve train parts such as bucket tappets, but is not limited thereto. Likewise, switchable roller or flat tappets and switchable supporting elements are included in the scope of protection. All elements can be provided with hydraulic or mechanical clearance compensation.

Der Erfindungsgedanke betrifft Lösungen mit wenigstens einem Koppelkolben, vorzugsweise sollen jedoch zwei sich diametral gegenüber liegende Koppelkolben appliziert sein. Denkbar und vorgesehen sind jedoch auch Lösungen, mit einer Koppelkolbenzahl >2 (sternförmige Anordnung).The idea of the invention relates to solutions with at least one coupling piston, but preferably two diametrically opposed coupling pistons should be applied. However, solutions are also conceivable and provided with a coupling piston number> 2 (star-shaped arrangement).

Im Entkoppelfall können die Koppelkolben im Gehäuse sitzen und für den Koppelfall(groβer-Nockenhub) radial nach innen in ihre jeweilige sichelartige Materialfreistellung am Außenmantel des Innenteils verschoben werden. Außerdem können die Koppelkolben im Innenteil, beispielsweise in einer Radialbohrung, verlaufen und für den Koppelfall radial nach außen in die angrenzende sichelartige Materialfreistellung der Bohrung des Gehäuses verlagert werden. Zweckmäßig ist es, wenn die Koppelkolben an ihrer entsprechenden Axialseite (Koppelbereich) mit einer Abflachung versehen sind, dies ist jedoch nicht Bedingung.In the decoupling case, the coupling pistons can sit in the housing and be displaced radially inwardly into their respective sickle-like material release on the outer jacket of the inner part for the coupling case (larger cam lift). In addition, the coupling piston in the inner part, for example, in a radial bore, extend and be displaced for the coupling case radially outward in the adjacent sickle-like material release of the bore of the housing. It is expedient if the coupling pistons are provided with a flattening on their corresponding axial side (coupling region), but this is not a condition.

Die vorschlagsgemäße jeweilige sichelartige Materialfreistellung kann für den Fall deren Ausbildung in der Bohrung des Gehäuses beispielsweise durch einen einfachen Scheibenfräsvorgang generiert werden. Denkbar sind jedoch auch andere spanabhebende Vorgänge wie Eindrehen bzw. ein spanloses Einbringen wie Prägen, Fließpressen bzw. Einsicken.The proposed respective sickle-like Materialfreistellung can be generated in the case of their training in the bore of the housing, for example, by a simple Scheibenfräsvorgang. Also conceivable, however, are other machining operations such as screwing or a non-cutting introduction such as embossing, extrusion or picking.

Besonders bevorzugt ist es, wenn das schaltbare Ventiltriebsteil, wie genannt, als ab- oder umschaltbarer Tassenstößel ausgebildet ist. Als Bohrung für die vorzugsweise zwei Koppelkolben ist insbesondere an eine Radialbohrung gedacht, die in einem Arbeitsgang einfach dargestellt werden kann. Denkbar und vorgesehen ist es jedoch auch, für jeden Koppelkolben eine Sackbohrung o. dgl. zu applizieren.It is particularly preferred if the switchable valve train part, as mentioned, is designed as a detachable or reversible tappet. As a bore for the preferably two coupling piston is especially thought of a radial bore, which can be easily displayed in one operation. Conceivable and However, it is also provided to apply a blind hole o. The like. For each coupling piston.

In Koppelrichtung werden die Koppelkolben vorzugsweise über Druckfederkraft radial nach außen (für den Fall deren Anordnung im Innenteil) beaufschlagt. Eine Rückverlagerung in Entkoppelrichtung ist über in die sichelartige Materialfreistellung jeweils leitbares Hydraulikmittel ermöglicht.In the coupling direction, the coupling pistons are preferably acted upon by compression spring force radially outwards (in the case of their arrangement in the inner part). A shift back in Entkoppelrichtung is made possible in the sickle-like material release each conductive hydraulic fluid.

Die jeweilige sichelartige Materialfreistellung schwächt nur geringfügig die Wandstärke, so dass auf notwendige Versteifungsmaßnahmen wie bei einer Ringnutkopplung im Stand der Technik verzichtet werden kann. Der Fachmann erkennt, dass aufgrund des Verzichts auf die Ringnut auch verkürzte Hydraulikmittelwege vorliegen.The respective sickle-like material release weakens only slightly the wall thickness, so that it can be dispensed with necessary stiffening measures such as in a Ringnutkopplung in the prior art. The skilled artisan will recognize that due to the omission of the annular groove and shortened hydraulic fluid paths are present.

Um insbesondere eine einfache Heranleitung des Hydraulikmittels in die sichelartigen Materialfreistellungen beim Tassenstößel zu gewährleisten, ist es in Konkretisierung der Erfindung vorgeschlagen, im Inneren des Gehäuses ein dünnwandiges Blechteil anzulegen, in dem entsprechende Kanäle, ausgehend von einem oder mehreren Durchlässen im Hemd, eingeformt sind. Ggf. können die Kanäle auch an einer Innenwandung des Gehäuses appliziert sein, so dass das dünnwandige Blechteil ggf. auch glattflächig dargestellt werden kann.In order to ensure in particular a simple instruction of the hydraulic means in the sickle-like Materialfreistellungen the bucket tappet, it is proposed in concretization of the invention to create a thin-walled sheet metal part inside the housing, in the corresponding channels, starting from one or more passages in the shirt, are formed. Possibly. For example, the channels can also be applied to an inner wall of the housing, so that the thin-walled sheet-metal part can optionally also be represented with a smooth surface.

Zur umfangsmäßigen Lagezuordnung der Koppelkolben zu ihren sichelartigen Materialfreistellungen ist es vorgeschlagen, in einem Ringspalt zwischen beiden Ventiltriebsbauteilen eine einfache Rotationssicherung wie einen Stift, eine Kugel o. dgl. zu applizieren.For circumferential positional assignment of the coupling piston to their sickle-like material exemptions, it is proposed to apply in a annular gap between the two valve train components a simple rotation safety device such as a pin, a ball o. The like.

Gleichfalls müssen die Koppelkolben, für den Fall ihrer Ausbildung mit einer Abflachung für einen "face-to-face"-Kontakt mit der entsprechenden Gegenfläche der sichelartigen Ausformung, gegenüber ihrer Bohrung rotationsgesichert werden. Hier bietet sich ein einfach auf deren Abflachungen legbarer Sicherungsring o. ä. an. Ggf. können die Koppelkolben auch durch einen in deren Radialbohrung einragenden Stift verdrehgesichert werden.Likewise, the coupling pistons, in the case of their training with a flattening for a "face-to-face" contact with the corresponding mating surface of the sickle-like formation, against rotation must be secured against their bore. Here is an easy on their flattening legbare circlip o. Ä. Possibly. The coupling piston can also be secured against rotation by a protruding into the radial bore pin.

Des weiteren ist es in Konkretisierung der Erfindung vorgesehen, das Innenteil dünnwandig / rohrartig auszubilden, wobei die Radialbohrung mit den Koppelkolben Bestandteil eines einfachen Querstegs ist. Somit liegt ein sehr preiswert darstellbares Innenelement vor.Furthermore, it is provided in concretization of the invention, the inner part thin-walled / pipe-like form, the radial bore with the coupling piston is part of a simple crosspiece. Thus, there is a very inexpensive representable inner element.

Kurze Beschreibung der ZeichnungShort description of the drawing

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

Figur 1
einen Längsschnitt durch einen Tassenstößel als schaltbares Ventiltriebsteil;
Figur 2
einen Querschnitt nach der Schnittlinie A-A der Figur 1 und
Figur 3
eine um 90° gegenüber Figur 1 gedrehte Schnittansicht.
The invention is suitably explained in more detail with reference to the drawing. Show it:
FIG. 1
a longitudinal section through a tappet as a switchable valve drive part;
FIG. 2
a cross section along the section line AA of FIG. 1 and
FIG. 3
a 90 ° opposite FIG. 1 rotated sectional view.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Dargestellt ist ein schaltbares Ventiltriebsteil 1, hier als Tassenstößel ausgebildet.Shown is a switchable valve drive part 1, designed here as a bucket tappet.

Das Ventiltriebsteil 1 besteht aus einem hohlzylindrischen Gehäuse 2, das über sein dünnwandiges Hemd 21 in einer Aufnahme der Brennkraftmaschine oszillierend anordenbar ist. Das Hemd 21 erstreckt sich von einem Außenrand 20 eines ringähnlichen Bodens 19 in nockenferne Richtung. Von einem Innenrand 22 des Bodens 19 geht ein Ansatz 23 weg. Dieser besitzt eine Bohrung 3, in der ein demgegenüber axial bewegliches, dünnwandig / rohrartig ausgebildetes Innenelement 4 aufgenommen ist. Das Innenelement 4 hat keinen Nockenkontakt, so dass das schaltbare Ventiltriebsteil 1 als Abschaltelement vorliegt.The valve drive part 1 consists of a hollow cylindrical housing 2, which can be arranged in an oscillating manner via its thin-walled shirt 21 in a receptacle of the internal combustion engine. The shirt 21 extends from an outer edge 20 of a ring-like bottom 19 in cam-distant direction. From an inner edge 22 of the bottom 19 is a projection 23 away. This has a bore 3, in which a contrast axially movable, thin-walled / tubular-like inner element 4 is added. The inner element 4 has no cam contact, so that the switchable valve drive part 1 is present as a shutdown element.

In einem Quersteg 38 des Innenelements 4 verläuft eine Bohrung 6, die hier als Radialbohrung vorliegt. In dieser Bohrung 6 liegen sich im Entkoppelfall zwei Koppelkolben 7 diametral gegenüber. Diese sind radial nach außen (Koppelrichtung) über die Kraft einer gegen deren innere Stirnen 17 wirkenden Schraubendruckfeder als Federmittel 18 beaufschlagt.In a transverse web 38 of the inner member 4 extends a bore 6, which is present here as a radial bore. In this bore 6 are located in the decoupling two coupling piston 7 diametrically opposite. These are urged radially outwards (coupling direction) via the force of a helical compression spring acting against their inner forehead 17 as spring means 18.

An einer Axialseite 12 (hier Nockenseite) sind die Koppelkolben 7, ausgehend von ihren radial äußeren Stirnen 11, mit je einer abschnittsweisen Abflachung 13 versehen. Figur 1 offenbart den Koppelzustand des Ventiltriebsteils 1, bei dem die Koppelkolben 7, abschnittsweise radial nach außen ausgefahren, mit einer Mitnehmerfläche 9 in der Bohrung 3 des Gehäuses 2 in Eingriff sind. Diese Mitnehmerfläche 9 ist durch eine obere flache Axialstirn einer sichelartigen Materialfreistellung 14 dargestellt, an der die jeweilige Abflachung 13 des Koppelkolbens 7 im Koppelfall anliegt. Die Materialfreistellung 14 kann beispielsweise mit einem in die Bohrung 3 des Gehäuses 2 einfahrbaren einfachen Scheibenfräser generiert werden (siehe auch Figur 2).On an axial side 12 (here cam side), the coupling piston 7, starting from their radially outer foreheads 11, each provided with a section-wise flattening 13. FIG. 1 discloses the coupling state of the valve train part 1, in which the coupling piston 7, partially extended radially outward, with a cam surface 9 in the bore 3 of the housing 2 are engaged. This driver surface 9 is represented by an upper flat Axialstirn a sickle-like material release 14, against which the respective flattening 13 of the coupling piston 7 in the coupling case. The material release 14 can be generated, for example, with a retractable into the bore 3 of the housing 2 simple disc milling cutter (see also FIG. 2 ).

Wie zu erkennen, ist die Bohrung 3 des Gehäuses 2 Bestandteil des sich vom Innenrand 22 des Bodens 19 des Gehäuses 2 in nockenferne Richtung erstreckenden hohlzylindrischen Ansatzes 23.As can be seen, the bore 3 of the housing 2 is part of the hollow-cylindrical projection 23 extending from the inner edge 22 of the bottom 19 of the housing 2 in the direction away from the cam.

Eine Rückverlagerung der Koppelkolben 7 in Entkoppelrichtung erfolgt über vor deren radial äußere Stirnen 11 in die Materialfreistellung 14 leitbares Hydraulikmittel. Hierfür hat das Gehäuse 2 in seinem Inneren ein weitestgehend anliegendes, dünnwandiges Element 25 wie ein Blechteil.A return displacement of the coupling piston 7 in the decoupling via above the radially outer forks 11 in the material release 14 conductive hydraulic fluid. For this purpose, the housing 2 has in its interior a largely fitting, thin-walled element 25 as a sheet metal part.

Ausgehend von einem Durchlass 26 im Hemd 21 (siehe Figur 3), wird das Hydraulikmittel weiter über einen hemdseitig in das Element 25 geformten Steigkanal 27 in Bodenrichtung geleitet. Dort erfolgt eine Weiterleitung radial nach innen über wenigstens einen Radialdurchtritt 28 zwischen dem Boden 19 und dem dortig anliegenden Abschnitt des Elements 25. Radial innen wird das Hydraulikmittel weiter über einen Axialkanal 31 nach unten geleitet, der zwischen einem Außenmantel 30 des Ansatzes 23 und dem dortig befindlichen Bereich des Elements 25 verläuft. In das Element 25 ist radial vor den Materialfreistellungen 14 ein Ringkanal 32 eingeformt, der mit dem Axialkanal 31 in Verbindung steht. Ausgehend von diesem Ringkanal 32 erfolgt eine Weiterleitung des Hydraulikmittels über respektive Übertritte 33 unmittelbar in die Materialfreistellungen 14 vor den radial äußeren Stirnen 11 der Koppelkolben 7.Starting from a passage 26 in the shirt 21 (see FIG. 3 ), the hydraulic fluid is further directed through a shirt side formed in the element 25 riser channel 27 in the bottom direction. There is a forwarding radially inwardly via at least one radial passage 28 between the bottom 19 and Radially inside, the hydraulic fluid is further directed downwards via an axial channel 31, which runs between an outer jacket 30 of the attachment 23 and the region of the element 25 located there. In the element 25, an annular channel 32 is formed radially in front of the Materialfreistellungen 14, which is in communication with the axial channel 31. Starting from this annular channel 32, a forwarding of the hydraulic fluid via respective crossings 33 takes place directly in the Materialfreistellungen 14 in front of the radially outer forehead 11 of the coupling piston. 7

Eine Ringfläche 8 zwischen den Bauteilen 2, 4 ist von einer Rotationssicherung 16 übergriffen ist. Diese sitzt in einer Aussparung 34 im Außenmantel 5 des Innenelements 4 und ist als Wälzkörper ausgebildet. Radial außen greift die Rotationssicherung 16 (Wälzkörper) in eine entsprechende Längsnut 35 der Bohrung 3 des Ansatzes 23.An annular surface 8 between the components 2, 4 is overlapped by a rotation lock 16. This sits in a recess 34 in the outer jacket 5 of the inner member 4 and is formed as a rolling element. Radially outward, the anti-rotation device 16 (rolling elements) engages in a corresponding longitudinal groove 35 of the bore 3 of the projection 23.

Gleichfalls haben die Koppelkolben 7 gegenüber deren Bohrung 6 eine Rotationssicherung 15. Diese ist als einfaches Sicherungselement wie ein Sprengring ausgebildet, der in einer Ringnut 36 am Außenmantel 5 des Innenelements 4 verläuft und im Bereich der Koppelkolben 7 auf deren Abflachungen 13 liegt.This is designed as a simple securing element as a snap ring which extends in an annular groove 36 on the outer jacket 5 of the inner member 4 and in the region of the coupling piston 7 lies on the flattened portions 13.

Liste der BezugszahlenList of reference numbers

  1. 1) Ventiltriebsteil1) Valve drive part
  2. 2) Gehäuse2) housing
  3. 3) Bohrung Gehäuse3) bore housing
  4. 4) Innenelement4) Interior element
  5. 5) Außenmantel5) outer jacket
  6. 6) Bohrung Koppelkolben6) bore coupling piston
  7. 7) Koppelkolben7) Coupling piston
  8. 8) Ringfläche8) Ring surface
  9. 9) Mitnehmerfläche9) driving surface
  10. 10)Lost-Motion-Federmittel10) lost motion spring means
  11. 11)(äußere)Stirn11) (outer) end
  12. 12)Axialseite12) axial
  13. 13)Abflachung13) Flattening
  14. 14)Materialfreistellung14) material exemption
  15. 15)Rotationssicherung15) antirotational
  16. 16)Rotationssicherung16) antirotational
  17. 17)(innere) Stirn17) (inner) forehead
  18. 18)Federmittel18) spring means
  19. 19)Boden19) Soil
  20. 20)Außenrand20) outer edge
  21. 21)Hemd21) Shirt
  22. 22)Innenrand22) the inner edge
  23. 23)Ansatz23) approach
  24. 24)Oberseite24) top
  25. 25)Element25) Element
  26. 26)Durchlass26) passage
  27. 27)Steigkanal27) rising duct
  28. 28)Radialdurchtritt28) radial passage
  29. 29)Unterseite Boden29) Bottom of the ground
  30. 30)Außenmantel30) outer shell
  31. 31)Axialkanal31) axial
  32. 32)Ringkanal32) annular channel
  33. 33)Übertritt33) crossing
  34. 34)Aussparung34) recess
  35. 35)Längsnut35) longitudinal groove
  36. 36)Ringnut36) annular groove
  37. 37)Entlüftungsöffnung37) vent
  38. 38)Quersteg38) transverse web

Claims (8)

  1. Switchable valve-drive part (1), with a hollow-cylindrical housing (2) in the bore (3) of which an inner element (4), axially movable in relation thereto, runs with its outer casing (5), at least one bore (6) with at least one coupling piston (7), running therein in the case of decoupling, being inherent in one of the components [inner element (4) or housing (2)], which bore (6) leads in the direction of the other component (2, 4) and issues on an annular face (8) between the components (4, 2), which coupling piston (7) can be brought partially into engagement with a driving face (9) of the other component (2, 4) in the case of coupling, and a lost-motion spring means (10) being provided, which acts upon the components (4, 2) in the direction in which these are pushed out away from one another, characterized in that the respective piston (7), starting from its end face (11) facing the driving face (9), is provided on an axial side (12) with a partial flattening (13), the other component (2, 4) being provided, only in the circumferential portion of the continuous bore (6) having the coupling piston (7), in one component (4, 2), in its bore (3)/on its outer casing (5), with a simple sickle-like material clearance (14), on one flat axial end face of which is provided the driving surface (9) for an engagement of the flattening (13) of the coupling piston (7) in the case of coupling, and, on the one hand, the coupling piston (7) being provided in relation to its bore (6) and, on the other hand, the components (4, 2) being provided in relation to one another with respective rotation prevention device (15, 16).
  2. Valve-drive part according to Claim 1, characterized in that exactly two coupling pistons (7) are provided which run in the bore (6), designed as a radial bore in the inner element (4) and lie diametrically opposite one another, the coupling pistons (7) being acted upon in their coupling direction via the force of a spring means (18), such as at least one helical compression spring, acting against their inner end faces (17), their displacement in the decoupling direction being effected via hydraulic means conductable from their outer end faces (11) into the respective sickle-like material clearance (14).
  3. Valve-drive part according to Claim 2, characterized in that the switchable valve-drive part (1) provided is a bucket tappet, with the housing (2) which has a ring-like bottom (19) as a cam contact face and which can be guided, via its shroud (21) projecting from the outer margin (20), in a bore of an internal combustion engine, which bottom (19) can be contacted by at least one large-stroke cam, there projecting from an inner margin (22) of the bottom (19) a hollow-cylindrical extension (23) which has the bore (3) with the inner element (4) guided therein, in which bore (3) are applied the two sickle-like mutually opposite material clearances (14), on the top sides (24) of which the flat axial end faces run as driving faces (9) and the inner element (4) either being designed to be free of cam contact on the bottom side or being provided with a disc-like bottom for a run-on of a low-stroke or a zero stroke cam.
  4. Valve-drive part according to Claim 3, characterized in that, inside the housing (2), a thin-walled element (25), such as a sheet-metal part, is laid in place, which follows essentially the inner contour of the latter, and, starting from at least one passage (26) in the shroud (21) of the housing (2), a riser duct (27) for the hydraulic medium is formed into the element (25), which riser duct is connected to one or more radial piercings (28) between an underside (29) of the bottom (19) and the element (25), at least one axial duct (31) being formed into the element (25), on the outer casing (30) of the extension (23), and communicating with the at least one radial piercing (28) and also leading further on in a direction remote from the bottom, which axial duct (31) issues into an annular duct (32) or ring-segment duct which is formed into the element (25) at a height upstream of the material clearances (14) and from which in each case an overflow (33) leads through the extension (23) to the respective sickle-like material clearance (14).
  5. Valve-drive part according to Claim 1, characterized in that the sickle-like material clearance (14) with the driving face (9) is produced by means of a milling operation, such as side milling or by beading/embossing or lathe-turning.
  6. Valve-drive part according to Claim 1 or 2, characterized in that, as a mutual rotation prevention device (16) of the components (4, 2), a body, such as a ball/pin, is provided, which is seated in a cutout (34) in the outer casing (5) of the inner element (4) or the bore (3) of the housing (2) and which, partially overlapping the annular face (8), experiences guidance in a longitudinal groove (35) of the bore (3) of the housing (2) or of the outer casing (5) of the inner element (4).
  7. Valve-drive part according to Claim 2, characterized in that, as a rotation prevention device (15) of the two coupling pistons (7) in relation to their bore (6), a ring part, such as a spring ring, is applied, which is arranged concentrically to the axis of the valve-drive part (1), runs in an annular groove (36) on the outer casing (5) of the inner element (4) and lies in the bore region on the flattenings (13) of the coupling pistons (7).
  8. Valve-drive part according to Claim 3, characterized in that the inner element (4) is of essentially thin-walled tube-like design, with the radially continuous bore (6) with coupling pistons (7) running in a transverse web (38) subdividing the inner element.
EP08717684A 2007-04-05 2008-03-12 Switchable valve train part Not-in-force EP2132419B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US91034707P 2007-04-05 2007-04-05
DE102007016739A DE102007016739A1 (en) 2007-04-07 2007-04-07 Switchable valve drive part
PCT/EP2008/052938 WO2008122477A1 (en) 2007-04-05 2008-03-12 Switchable valve train part

Publications (2)

Publication Number Publication Date
EP2132419A1 EP2132419A1 (en) 2009-12-16
EP2132419B1 true EP2132419B1 (en) 2010-08-11

Family

ID=39736266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08717684A Not-in-force EP2132419B1 (en) 2007-04-05 2008-03-12 Switchable valve train part

Country Status (6)

Country Link
EP (1) EP2132419B1 (en)
KR (1) KR101465280B1 (en)
CN (1) CN101680313A (en)
AT (1) ATE477402T1 (en)
DE (2) DE102007016739A1 (en)
WO (1) WO2008122477A1 (en)

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US11339688B2 (en) 2020-01-29 2022-05-24 Borgwarner, Inc. Variable camshaft timing valve assembly

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US9243521B2 (en) 2010-12-13 2016-01-26 Eaton Corporation Pump actuator anti-rotation device
USD701243S1 (en) 2011-12-13 2014-03-18 Eaton Corporation Pump actuator anti-rotation device

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Also Published As

Publication number Publication date
KR20100015364A (en) 2010-02-12
KR101465280B1 (en) 2014-11-26
WO2008122477A8 (en) 2009-12-03
ATE477402T1 (en) 2010-08-15
WO2008122477A1 (en) 2008-10-16
DE102007016739A1 (en) 2008-10-09
CN101680313A (en) 2010-03-24
DE502008001125D1 (en) 2010-09-23
EP2132419A1 (en) 2009-12-16

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