EP1646767B1 - Valve tappet system, especially anti-rotation bucket tappet having a curved cam follower surface - Google Patents

Valve tappet system, especially anti-rotation bucket tappet having a curved cam follower surface Download PDF

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Publication number
EP1646767B1
EP1646767B1 EP04740400A EP04740400A EP1646767B1 EP 1646767 B1 EP1646767 B1 EP 1646767B1 EP 04740400 A EP04740400 A EP 04740400A EP 04740400 A EP04740400 A EP 04740400A EP 1646767 B1 EP1646767 B1 EP 1646767B1
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EP
European Patent Office
Prior art keywords
valve tappet
arrangement according
tappet arrangement
rotation element
engagement
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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.)
Expired - Fee Related
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EP04740400A
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German (de)
French (fr)
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EP1646767A1 (en
Inventor
Franz Kreil
Gunter Schröter
Berthold Manke
Franz Bonauer
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP1646767A1 publication Critical patent/EP1646767A1/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
    • F01L1/12—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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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 valve tappet device, in particular a tappet with a convexly curved cam follower surface as it may be provided for example in internal combustion engines for actuating the gas exchange valves.
  • the invention further relates to an anti-rotation device for a valve tappet device for preventing a rotary or pivoting movement of a base body of the valve tappet device about its axis of oscillation.
  • valve tappet is designed as a bucket tappet and laterally, ie provided in the region of the tappet jacket with an opening.
  • a guide element is used which is formed by a spiral compression spring.
  • the spiral compression spring is received in the opening in such a way that a side region of the spiral compression spring protrudes in the radial direction over an outer circumferential surface of the cup tappet. This radially outstanding portion of the spiral compression spring immersed in the installed position in a cylinder head side formed guide and prevents a linear guide element pivotal movement of the bucket tappet about its axis of oscillation.
  • the jacket region is provided with an opening, in which a guide member is inserted such that a guide portion of the same projects in the radial direction over the cladding region.
  • This projecting area immersed in the installed position in a guide groove provided on the cylinder head side, thereby preventing in a known manner, a rotary or pivotal movement of the plunger about the axis of oscillation.
  • Anti-rotation devices for valve tappets are required, in particular, when the cam follower surface, which at least temporarily comes into contact with the associated cam-and which is actuated by the cam-is curved, for example crowned.
  • the invention has for its object to provide a valve stem device, which is characterized by an advantageous running and operating behavior and proves to be advantageous in manufacturing and assembly technical aspects.
  • valve tappet device having a base body, a jacket portion which forms a guide surface, for guiding the base body along an axis of oscillation, and a Vermosommeselement to prevent rotation or pivotal movement about those Oszillationsachse, the anti-rotation a seating surface on the Shell section is seated and having a guide body which projects in the radial direction over the shell portion, wherein this valve tappet device characterized characterized in that the anti-rotation member comprises a first engagement projection and a second engagement projection spaced therefrom in the oscillation direction, and the shell portion is provided with a first radial bore and a second radial bore associated with the first engagement portion, and the first engagement portion and the second engagement portion each immersed radially to the axis of oscillation in the associated radial bore.
  • the first engagement portion and the second engagement portion are preferably received in the respective radial bores such that the anti-rotation element is coupled to the shell portion substantially free of play both in the oscillation direction and in the circumferential direction of the shell portion.
  • This play-free fit can be achieved in particular by the engagement portions receive a defined excess so that they sit under a slight interference fit in the respective radial bore. It is also possible to set the positions of the engagement portions and the radial bores offset in such a way that results in the use of the insert portions in the radial bores a defined tension, preferably a compressive stress of the guide body.
  • the first engagement portion and the second engagement portion are preferably formed as a cylinder pin or at least as a cylinder pin segments.
  • the engagement opening provided for receiving the respective engagement section in the cylinder jacket can hereby be drilled into the jacket section of the base body in a production-favorable manner. It is possible to provide different diameters for the first and the second insert section, so that the anti-rotation element can be attached to the jacket section only in a specific installation position.
  • both radial bores and both engagement sections have the same diameter, so that both radial bores can be drilled with the same tool, and the anti-rotation element can also be "swiveled by 180 °" attached to the shell portion.
  • the protrusion dimension of a region of the first or second engagement section which rises above the seat surface and penetrates toward the oscillation axis preferably corresponds at least to the wall thickness of the jacket section. This makes it possible to completely use the Lochlaibungstlächen provided by the radial bores for the transmission of the oscillatory forces. It is also possible, even in the region of the radial bores, to provide structures, in particular peripheral edges, by means of which the anti-rotation element can be fixed to the jacket section.
  • a particularly advantageous fixation of the anti-rotation element on the shell portion of the tappet can be achieved by in the region of the first engagement portion and in the region of the second engagement portion of the shell portion engaging behind fixing structures are formed.
  • the fixing structures can be designed as latching devices which are attached to an elastically yielding arm section.
  • the arm portion is preferably arranged in its associated radial bore such that it is still within the enveloping circle of the radial bore. It is possible to provide further structures, such as male moldings, by which the locking device is locked and secured in the detent position.
  • the latching engagement between the anti-rotation element and the shell portion can also be brought about under temporary elastic deformation of the anti-rotation element.
  • the anti-rotation element is preferably made of a sufficiently elastic material and matched with respect to its locking structures on the base body such that it can be clipped to the base body.
  • the guide body formed by the anti-rotation element preferably has a circular segment-like, preferably semicircular segment-like cross-section in a sectional plane perpendicular to the oscillation axis.
  • the guide body or the anti-rotation element is made of a plastic material. This makes it possible to advantageously provide the anti-rotation element under manufacturing aspects.
  • the thus configured valve tappet device is characterized by a low mass and favorable running and damping properties.
  • the selection of the plastic material is preferably carried out under material-technical aspects, which take into account in addition to the thermal and mechanical strength in particular tribological and vibration control criteria.
  • the anti-rotation element is preferably captively coupled to the base body in a form-fitting manner in the installed position.
  • the positive connection of the anti-rotation element with the base body can be brought about by forming an end region of at least one of the engagement sections passing through the jacket section.
  • it is possible to accomplish the positive connection of the anti-rotation element with the base body by forming a head portion at that the shell portion passing through engaging portion.
  • the transformation can be accomplished in conjunction with local plasticization, for example by heat melting.
  • the cup tappet is supported on a mold core which has a mold space section for forming a head portion engaging behind the casing section.
  • the geometry of the anti-rotation element is preferably tuned such that the guide body in the installed position is captively coupled to the base body. It is possible to dimension the coupling structures between the anti-rotation element and the base body in such a way that they ensure a form-locking coupling in the oscillation and in the circumferential direction with a high safety margin.
  • the fixation in the radial direction can be designed such that only a captive is guaranteed for the assembly process.
  • the base body per se can be provided directly with a head section, this head section forming a cam contact zone.
  • the cam contact zone preferably forms a curved, in particular crowned, cam contact surface in a sectional plane which is radial to the camshaft axis.
  • the valve tappet device designed in this way can, in particular, be in the form of a tappet in an internal combustion engine with overhead camshafts and employees, i. Non-parallel, mutually inclined valve axes find application.
  • the valve tappet device illustrated in FIG. 1 comprises a base body 1, whose shell section 2 forms a guide surface 3, for guiding the base body 1 along an oscillation axis X.
  • An anti-rotation element 4 is attached to the base body 1 in order to prevent a rotational or pivoting movement of the base body 1 about those oscillation axis X, wherein the anti-rotation element forms a guide body protruding over the jacket portion in the radial direction.
  • the base body 1 is provided with a head portion 7.
  • the head portion 7 forms a cam contact zone 8.
  • the cam contact zone 8 is formed in this embodiment as a crowned in a camshaft radial plane E cam contact surface.
  • the valve tappet device is characterized in that the anti-rotation locking element 4 has a first Engaging projection 5 and a second engagement projection 6 spaced therefrom in the oscillation direction, and that the skirt portion 2 is provided with a first radial bore Rb1 associated with the first engagement portion 5 and a second radial bore Rb2 associated with the second engagement portion 6, and the first engagement portion as well as the second engagement portion 5, 6 in each case radially to the oscillation axis (X) in its associated radial bore Rb1, Rb2 dips.
  • the first engagement portion 5 and the second engagement portion 6 are received in the respective radial bores Rb1, Rb2 such that the anti-rotation element 4 is coupled to the shell portion 2 substantially free of play both in the oscillation direction and in the circumferential direction of the shell portion 2.
  • the first engagement portion 5, and the second engagement portion 6 are formed as a cylindrical pin and have in a direction of the axis of oscillation (X) parallel cutting plane on a circular cross-section. Both cylinder pins each have the same diameter.
  • the supernatant dimension I (FIG. 3) of a region of the first or second engagement section 5, 6 which projects over the seating surface S and projects towards the oscillation axis X preferably corresponds at least to the wall thickness t (FIG. 2) of the jacket section 2.
  • the transition into the seat S is designed such that the anti-rotation element 4 can sit reliably with its seat S on the shell portion 2.
  • the transition is executed as an undercut.
  • the guide body of the anti-rotation element 4 has a circular segment-like cross-section Q in a sectional plane perpendicular to the oscillation axis X.
  • the guide body is made of a plastic material and as indicated by the arrow symbol P, radially attachable to the shell portion 2. Due to the guidance of the tappet cylinder head side provided guide structures, in particular one for receiving the anti-rotation element provided sliding groove, the Verderehommeselement is in the installed position captive coupled to the shell portion 2.
  • FIG. 5 shows a further variant of a non-rotating cup tappet.
  • the anti-rotation element 4 in the region of the first engagement portion 5 and in the region of the second engagement portion 6 with the shell portion 2 engages behind fixing structures 5a, 6a.
  • the fixing structures 5a, 6a are designed as latching devices and each have a latching structure 5b, 6b engaging behind the casing section 2.
  • the latching structure 5b, 6b is in each case attached to an elastically yielding arm section 5c, 6c.
  • the arm section 5c, 6c is arranged in the installed position in its associated radial bore Rb1, Rb2.
  • the anti-rotation element of Figure 5 is shown enlarged as a single part.
  • the arrangement and design of the fixing structures 5a, 6a is such that the arm sections 5c, 6c are located within the enveloping circle defined by the radial bores Rb1, Rb2 (FIG.
  • the arm portions 5c, 6c are first deflected when attaching the anti-rotation element 4 to the shell portion 2 as indicated by the arrows P2 and P3.
  • the latching surfaces R provided by the latching structures 5b, 6b come to lie behind the inner surface of the casing section 2, they are elastically swung back into the position shown here and engage behind the area of the casing section 2 defined between the radial bores Rb1, Rb2.
  • the anti-rotation element 4 shown here can be manufactured from a plastic material as part of an injection step.
  • the embodiment shown here can be produced by a slide-free tool by defining the locking surfaces defining mold wall of a mold, through the end face of a punch, which passes through a forming space to form a punch opening ST provided for forming the guide body.
  • a slide-free tool by defining the locking surfaces defining mold wall of a mold, through the end face of a punch, which passes through a forming space to form a punch opening ST provided for forming the guide body.
  • a corresponding mold parting plane WZ is indicated in Figure 6 by dashed lines.
  • FIG. 7 illustrates, in the form of a perspective view, the anti-rotation element 4 according to FIG. 6 with a view of the stamp opening ST formed therein and the latching surfaces R located therein. It is possible to use in this punch opening an insert element, by which the latching mechanism is secured in the locked position.
  • the radial bores Rb1, Rb2 provided for receiving the engagement elements of the anti-rotation element 4 on the base body 1 can serve as clamping or positioning surfaces in the context of the production of the base body 1, in particular during a grinding process.

Description

Die Erfindung betrifft eine Ventilstößeleinrichtung, insbesondere einen Tassenstößel mit einer konvex gekrümmten Nockenfolgefläche wie er beispielsweise bei Brennkraftmaschinen zur Betätigung der Gaswechselventile vorgesehen sein kann. Die Erfindung befasst sich weiterhin auch mit einer Verdrehsicherung für eine Ventilstößeleinrichtung zur Verhinderung einer Dreh- oder Schwenkbewegung eines Basiskörpers der Ventilstößeleinrichtung um dessen Oszillationsachse.The invention relates to a valve tappet device, in particular a tappet with a convexly curved cam follower surface as it may be provided for example in internal combustion engines for actuating the gas exchange valves. The invention further relates to an anti-rotation device for a valve tappet device for preventing a rotary or pivoting movement of a base body of the valve tappet device about its axis of oscillation.

Aus DE 43 42 199 A1 ist eine Verdrehsicherung für einen Ventilstößel bekannt. Dieser Ventilstößel ist als Tassenstößel ausgebildet und seitlich, d.h. im Bereich des Stößelmantels mit einer Durchbrechung versehen. In diese Durchbrechung ist ein Führungselement eingesetzt das durch eine Spiral-Druckfeder gebildet ist. Die Spiral-Druckfeder ist, in der Durchbrechung derart aufgenommen, dass ein Seitenbereich der Spiral-Druckfeder in radialer Richtung über eine äußere Mantelfläche des Tassenstößels hervorragt. Dieser radial hervorragende Abschnitt der Spiral-Druckfeder taucht in Einbauposition in eine zylinderkopfseitig ausgebildete Führungsnut ein und verhindert als Linearführungselement eine Schwenkbewegung des Tassenstößels um dessen Oszillationsachse.From DE 43 42 199 A1 a rotation for a valve lifter is known. This valve tappet is designed as a bucket tappet and laterally, ie provided in the region of the tappet jacket with an opening. In this opening a guide element is used which is formed by a spiral compression spring. The spiral compression spring is received in the opening in such a way that a side region of the spiral compression spring protrudes in the radial direction over an outer circumferential surface of the cup tappet. This radially outstanding portion of the spiral compression spring immersed in the installed position in a cylinder head side formed guide and prevents a linear guide element pivotal movement of the bucket tappet about its axis of oscillation.

Aus DE 43 02 877 C2 ist ein ähnlicher Stößel bekannt, bei welchem das vorangehend genannte Führungselement als Zylinderzapfen ausgebildet ist und in gleicher Weise wie jene Spiraldruckfeder in eine seitliche Durchbrechung des Stößelmantels eingesetzt ist.From DE 43 02 877 C2, a similar plunger is known, in which the above-mentioned guide element is designed as a cylindrical pin and is used in the same way as those coil spring in a lateral opening of the plunger jacket.

Aus DE 196 00 852 A1 ist ein verdrehgesicherter Stößel bekannt, dessen Mantelbereich mit einer Durchbrechung versehen ist, in welche ein Führungsglied derart eingesetzt ist, dass ein Führungsabschnitt desselben in radialer Richtung über den Mantelbereich übersteht. Dieser überstehende Bereich taucht in Einbauposition in eine zylinderkopfseitig vorgesehene Führungsnut ein und verhindert dabei in bekannter Weise eine Dreh- oder Schwenkbewegung des Stößels um dessen Oszillationsachse.From DE 196 00 852 A1 a non-rotating ram is known, the jacket region is provided with an opening, in which a guide member is inserted such that a guide portion of the same projects in the radial direction over the cladding region. This projecting area immersed in the installed position in a guide groove provided on the cylinder head side, thereby preventing in a known manner, a rotary or pivotal movement of the plunger about the axis of oscillation.

Aus DE 101 10 914 A1 und US PS 3,822,683 sind weitere Verdrehsicherungen für Ventilstößel bekannt, bei welchen ein zur Verhinderung einer Drehung in Umfangsrichtung vorgesehenes Führungsorgan in eine Durchbrechung eines Mantelbereiches des Ventilstößels eingesetzt ist oder in diese eintaucht.DE 101 10 914 A1 and US Pat. No. 3,822,683 disclose further anti-rotation devices for valve tappets in which a guide element provided to prevent rotation in the circumferential direction is inserted into or penetrated into an opening in a jacket region of the valve tappet.

Verdrehsicherungen für Ventilstößel sind insbesondere dann erforderlich, wenn die mit dem zugeordneten Nocken zumindest temporär in Kontakt gelangende - und durch den Nocken betätigte - Nockenfolgefläche gekrümmt, zum Beispiel ballig ausgebildet ist.Anti-rotation devices for valve tappets are required, in particular, when the cam follower surface, which at least temporarily comes into contact with the associated cam-and which is actuated by the cam-is curved, for example crowned.

Der Erfindung liegt die Aufgabe zugrunde, eine Ventilstößeleinrichtung zu schaffen, die sich durch ein vorteilhaftes Lauf- und Betriebsverhalten auszeichnet und unter fertigungs- und montagetechnischen Gesichtspunkten als vorteilhaft erweist.The invention has for its object to provide a valve stem device, which is characterized by an advantageous running and operating behavior and proves to be advantageous in manufacturing and assembly technical aspects.

Diese Aufgabe wird erfindungsgemäß gelöst durch eine Ventilstößeleinrichtung mit einem Basiskörper, einem Mantelabschnitt, der eine Führungsfläche bildet, zur Führung des Basiskörpers entlang einer Oszillationsachse, und einem Verdrehsicherungselement zur Unterbindung einer Dreh- oder Schwenkbewegung um jene Oszillationsachse, wobei das Verdrehsicherungselement eine Sitzfläche die auf dem Mantelabschnitt aufsitzt und einen Führungskörper aufweist der in radialer Richtung über den Mantelabschnitt übersteht, wobei sich diese Ventilstößeleinrichtung dadurch auszeichnet, dass das Verdrehsicherungselement einen ersten Eingriffsvorsprung und einen hiervon in Oszillationsrichtung beabstandeten zweiten Eingriffsvorsprung umfasst, und dass der Mantelabschnitt mit einer dem ersten Eingriffsabschnitt zugeordneten ersten Radialbohrung und einer dem zweiten Eingriffsabschnitt zugeordneten zweiten Radialbohrung versehen ist, und der erste Eingriffsabschnitt wie auch der zweite Eingriffsabschnitt jeweils radial zur Oszillationsachse in die ihm zugeordnete Radialbohrung eintaucht.This object is achieved by a valve tappet device having a base body, a jacket portion which forms a guide surface, for guiding the base body along an axis of oscillation, and a Verdrehsicherungselement to prevent rotation or pivotal movement about those Oszillationsachse, the anti-rotation a seating surface on the Shell section is seated and having a guide body which projects in the radial direction over the shell portion, wherein this valve tappet device characterized characterized in that the anti-rotation member comprises a first engagement projection and a second engagement projection spaced therefrom in the oscillation direction, and the shell portion is provided with a first radial bore and a second radial bore associated with the first engagement portion, and the first engagement portion and the second engagement portion each immersed radially to the axis of oscillation in the associated radial bore.

Dadurch wird es auf vorteilhafte Weise möglich, eine unzulässige Drehbewegung des Basiskörpers um dessen Oszillationsachse zuverlässig zu verhindern, wobei durch die erfindungsgemäß vorgeschlagene, montagetechnisch günstig bewerkstelligbare Koppelung des Verdrehsicherungselementes mit dem Basiskörper dessen Mantelabschnitt nicht unzulässig stark strukturmechanisch beeinträchtigt wird.This advantageously makes it possible to reliably prevent an inadmissible rotational movement of the base body about its axis of oscillation, whereby the jacket section which is proposed according to the invention, which can be brought about with low installation effort, can not be excessively structurally impaired by the coupling of the anti-rotation element with the base body.

Der erste Eingriffsabschnitt und der zweite Eingriffsabschnitt sind in den jeweiligen Radialbohrungen vorzugsweise derart aufgenommen, dass das Verdrehsicherungselement sowohl in Oszillationsrichtung als auch in Umfangsrichtung des Mantelabschnitts im wesentlichen spielfrei mit dem Mantelabschnitt gekoppelt ist. Dieser spielfreie Sitz kann insbesondere erreicht werden, indem die Eingriffsabschnitte ein definiertes Übermaß erhalten, so dass diese unter einem leichten Presssitz in der jeweiligen Radialbohrung sitzen. Es ist auch möglich, die Positionen der Eingriffsabschnitte und der Radialbohrungen derart versetzt festzulegen, dass sich beim Einsatz der Einsatzabschnitte in die Radialbohrungen eine definierte Verspannung, vorzugsweise eine Druckverspannung des Führungskörpers ergibt.The first engagement portion and the second engagement portion are preferably received in the respective radial bores such that the anti-rotation element is coupled to the shell portion substantially free of play both in the oscillation direction and in the circumferential direction of the shell portion. This play-free fit can be achieved in particular by the engagement portions receive a defined excess so that they sit under a slight interference fit in the respective radial bore. It is also possible to set the positions of the engagement portions and the radial bores offset in such a way that results in the use of the insert portions in the radial bores a defined tension, preferably a compressive stress of the guide body.

Der erste Eingriffsabschnitt sowie der zweite Eingriffsabschnitt sind vorzugsweise als Zylinderzapfen oder zumindest als Zylinderzapfensegmente ausgebildet. Die zur Aufnahme des jeweiligen Eingriffsabschnitts in dem Zylindermantel vorgesehene Eingriffsöffnung kann hierbei auf fertigungstechnisch günstige Weise in den Mantelabschnitt des Basiskörper eingebohrt werden. Es ist möglich, für den ersten und den zweiten Einsatzabschnitt unterschiedliche Durchmesser vorzusehen, so dass das Verdrehsicherungselement nur in einer bestimmten Einbauposition an den Mantelabschnitt ansetzbar ist. Vorzugsweise weisen jedoch beide Radialbohrungen sowie beide Eingriffsabschnitte den gleichen Durchmesser auf, so dass beide Radialbohrungen mit dem gleichen Werkzeug gebohrt werden können, und das Verdrehsicherungselement auch "um 180°" geschwenkt an den Mantelabschnitt angesetzt werden kann.The first engagement portion and the second engagement portion are preferably formed as a cylinder pin or at least as a cylinder pin segments. The engagement opening provided for receiving the respective engagement section in the cylinder jacket can hereby be drilled into the jacket section of the base body in a production-favorable manner. It is possible to provide different diameters for the first and the second insert section, so that the anti-rotation element can be attached to the jacket section only in a specific installation position. Preferably, however, both radial bores and both engagement sections have the same diameter, so that both radial bores can be drilled with the same tool, and the anti-rotation element can also be "swiveled by 180 °" attached to the shell portion.

Das Überstandsmaß eines sich über die Sitzfläche erhebenden und zur Oszillationsachse vordringenden Bereichs des ersten oder zweiten Eingriffsabschnitts entspricht vorzugsweise wenigstens der Wanddicke des Mantelabschnitts. Hierdurch wird es möglich, die durch die Radialbohrungen bereitgestellten Lochlaibungstlächen vollständig zur Übertragung der Oszillationskräfte heranzuziehen. Es ist auch möglich, bereits im Bereich der Radialbohrungen Strukturen, insbesondere Umfangskanten vorzusehen, durch welche das Verdrehsicherungselement an dem Mantelabschnitt fixierbar ist.The protrusion dimension of a region of the first or second engagement section which rises above the seat surface and penetrates toward the oscillation axis preferably corresponds at least to the wall thickness of the jacket section. This makes it possible to completely use the Lochlaibungstlächen provided by the radial bores for the transmission of the oscillatory forces. It is also possible, even in the region of the radial bores, to provide structures, in particular peripheral edges, by means of which the anti-rotation element can be fixed to the jacket section.

Eine besonders vorteilhafte Fixierung des Verdrehsicherungselementes an dem Mantelabschnitt des Tassenstößels kann erreicht werden, indem im Bereich des ersten Eingriffsabschnittes und im Bereich des zweiten Eingriffsabschnittes den Mantelabschnitt hintergreifende Fixierstrukturen ausgebildet sind.A particularly advantageous fixation of the anti-rotation element on the shell portion of the tappet can be achieved by in the region of the first engagement portion and in the region of the second engagement portion of the shell portion engaging behind fixing structures are formed.

Die Fixierstrukturen können als Rasteinrichtungen ausgebildet sein die an einem elastisch nachgiebigen Armabschnitt angebracht sind. Der Armabschnitt ist vorzugsweise in der ihm zugeordneten Radialbohrung derart angeordnet, dass dieser sich noch innerhalb des Hüllkreises der Radialbohrung befindet. Es ist möglich, weiter Strukturen, beispielsweise Einsteckformteile vorzusehen, durch welche die Rasteinrichtung in der Raststellung arretiert und gesichert wird.The fixing structures can be designed as latching devices which are attached to an elastically yielding arm section. The arm portion is preferably arranged in its associated radial bore such that it is still within the enveloping circle of the radial bore. It is possible to provide further structures, such as male moldings, by which the locking device is locked and secured in the detent position.

Der Rasteingriff zwischen dem Verdrehsicherungselement und dem Mantelabschnitt kann auch unter vorübergehender elastischer Verformung des Verdrehsicherungselementes herbeigeführt werden.The latching engagement between the anti-rotation element and the shell portion can also be brought about under temporary elastic deformation of the anti-rotation element.

Das Verdrehsicherungselement ist vorzugsweise aus einem hinreichend elastischen Material gefertigt und hinsichtlich seiner Raststrukturen derart auf den Basiskörper abgestimmt, dass dieses an den Basiskörper anklipsbar ist.The anti-rotation element is preferably made of a sufficiently elastic material and matched with respect to its locking structures on the base body such that it can be clipped to the base body.

Der durch das Verdrehsicherungselement gebildete Führungskörper weist vorzugsweise in einer zur Oszillationsachse senkrechten Schnittebene einen kreissegmentartigen, vorzugsweise halbkreissegmentartigen Querschnitt auf.The guide body formed by the anti-rotation element preferably has a circular segment-like, preferably semicircular segment-like cross-section in a sectional plane perpendicular to the oscillation axis.

In vorteilhafter Weise ist der Führungskörper bzw. das Verdrehsicherungselement aus einem Kunststoffmaterial gefertigt. Hierdurch wird es möglich, das Verdrehsicherungselement unter fertigungstechnischen Gesichtspunkten vorteilhaft bereitzustellen. Zudem zeichnet sich die so ausgestaltete Ventilstößeleinrichtung durch eine geringe Masse und günstige Lauf- und Dämpfungseigenschaften aus.Advantageously, the guide body or the anti-rotation element is made of a plastic material. This makes it possible to advantageously provide the anti-rotation element under manufacturing aspects. In addition, the thus configured valve tappet device is characterized by a low mass and favorable running and damping properties.

Die Auswahl des Kunststoffmateriales erfolgt vorzugsweise unter werkstofftechnischen Gesichtspunkten, die neben der thermischen und mechanischen Belastbarkeit insbesondere auch tribologischen und schwingungstechnischen Kriterien Rechnung tragen.The selection of the plastic material is preferably carried out under material-technical aspects, which take into account in addition to the thermal and mechanical strength in particular tribological and vibration control criteria.

Das Verdrehsicherungselement ist vorzugsweise in Einbauposition verliersicher mit dem Basiskörper in formschlüssiger Weise gekoppelt. Die formschlüssige Verbindung des Verdrehsicherungselementes mit dem Basiskörper kann durch Umformung eines den Mantelabschnitt durchsetzenden Endbereiches wenigstens eines der Eingriffsabschnitte herbeigeführt werden. Insbesondere ist es möglich, die formschlüssige Verbindung des Verdrehsicherungselementes mit dem Basiskörper durch Bildung eines Kopfabschnittes an jenem den Mantelabschnitt durchsetzenden Eingriffsabschnitt zu bewerkstelligen. Die Umformung kann in Verbindung mit einer lokalen Plastifizierung, beispielsweise durch Wärmeschmelzen bewerkstelligt werden.The anti-rotation element is preferably captively coupled to the base body in a form-fitting manner in the installed position. The positive connection of the anti-rotation element with the base body can be brought about by forming an end region of at least one of the engagement sections passing through the jacket section. In particular, it is possible to accomplish the positive connection of the anti-rotation element with the base body by forming a head portion at that the shell portion passing through engaging portion. The transformation can be accomplished in conjunction with local plasticization, for example by heat melting.

Es ist auch möglich, das Verdrehsicherungselement an den Mantelabschnitt im Rahmen eines Kunststoffspritzschrittes anzuspritzen. Vorzugsweise wird hierbei der Tassenstößel an einem Formkern abgestützt der einen Formraumabschnitt zur Ausbildung eines den Mantelabschnitt hintergreifenden Kopfabschnittes aufweist.It is also possible to inject the anti-rotation element to the shell portion in the context of a plastic injection step. Preferably, in this case, the cup tappet is supported on a mold core which has a mold space section for forming a head portion engaging behind the casing section.

Es ist auch möglich, die Koppelung des Verdrehsicherungselementes mit dem Mantelabschnitt durch zusätzliche Verbindungsmittel, insbesondere Nietverbindungsmittel zu unterstützen.It is also possible to support the coupling of the anti-rotation element with the shell portion by additional connecting means, in particular rivet connection means.

Die Geometrie des Verdrehsicherungselementes ist vorzugsweise derart abgestimmt, dass der Führungskörper in Einbauposition verliersicher mit dem Basiskörper gekoppelt ist. Es ist möglich, die Koppelungsstrukturen zwischen dem Verdrehsicherungselement und dem Basiskörper derart zu dimensionieren, dass diese mit hoher Sicherheitsreserve eine formschlüssige Koppelung in Oszillations- sowie in Umfangsrichtung sicherstellen. Die Fixierung in radialer Richtung kann derart ausgelegt sein, dass lediglich eine Verliersicherung für den Montagevorgang gewährleistet ist.The geometry of the anti-rotation element is preferably tuned such that the guide body in the installed position is captively coupled to the base body. It is possible to dimension the coupling structures between the anti-rotation element and the base body in such a way that they ensure a form-locking coupling in the oscillation and in the circumferential direction with a high safety margin. The fixation in the radial direction can be designed such that only a captive is guaranteed for the assembly process.

Der Basiskörper an sich kann unmittelbar mit einem Kopfabschnitt versehen sein, wobei dieser Kopfabschnitt eine Nockenkontaktzone bildet. Alternativ hierzu ist es auch möglich, in dem Basiskörper ein weiteres, beispielsweise selektiv zuschaltbares Stößelelement zu führen. Die Nockenkontaktzone bildet vorzugsweise in einer zur Nockenwellenachse radialen Schnittebene eine gekrümmte, insbesondere ballige Nockenkontaktfläche. Die derart ausgestaltete Ventilstößeleinrichtung kann insbesondere in Form eines Tassenstößels bei einer Brennkraftmaschine mit oben liegend angeordneten Nockenwellen und angestellten, d.h. nicht-parallelen, zueinander geneigten Ventilachsen Anwendung finden.The base body per se can be provided directly with a head section, this head section forming a cam contact zone. Alternatively, it is also possible to guide in the base body another, for example selectively switchable plunger element. The cam contact zone preferably forms a curved, in particular crowned, cam contact surface in a sectional plane which is radial to the camshaft axis. The valve tappet device designed in this way can, in particular, be in the form of a tappet in an internal combustion engine with overhead camshafts and employees, i. Non-parallel, mutually inclined valve axes find application.

Weitere vorteilhafte Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung in Verbindung mit der Zeichnung. Es zeigt:

Figur 1
eine perspektivische Darstellung der erfindungsgemäßen Ventilstößeleinrichtung mit einem Verdrehsicherungselement sowie einen Basiskörper;
Figur 2
eine Axial-Schnittansicht der Ventilstößeleinrichtung nach Figur 1 zur Erläuterung der Koppelungsstrukturen;
Figur 3
eine perspektivische Ansicht des Verdrehsicherungselementes der Ventilstößeleinrichtung nach den Figuren 1 und 2.
Figur 4
eine perspektivische Ansicht sowohl des Tassenstößels als auch des zugeordneten Verdrehsicherungselementes der Ventilstößeleinrichtung nach den Figuren 1 und 2.
Figur 5
eine perspektivische Teilschnittansicht sowohl des Tassenstößels als auch des zugeordneten Verdrehsicherungselementes der Ventilstößeleinrichtung gemäß einer zweiten, Rasteinrichtungen aufweisenden Ausführungsform der Erfindung;
Figur 6
eine Axial-Schnittansicht zur Erläuterung des Aufbaus des Verdrehsicherungselementes nach Figur 5;
Figur 7
eine perspektivische Ansicht des Verdrehsicherungselementes der Ventilstößeleinrichtung nach den Figuren 5 und 6.
Further advantageous details of the invention will become apparent from the following description taken in conjunction with the drawings. It shows:
FIG. 1
a perspective view of the valve tappet device according to the invention with an anti-rotation element and a base body;
FIG. 2
an axial sectional view of the valve tappet device of Figure 1 to explain the coupling structures;
FIG. 3
a perspective view of the anti-rotation element of the valve tappet device according to Figures 1 and 2.
FIG. 4
a perspective view of both the tappet and the associated anti-rotation element of the valve tappet device according to Figures 1 and 2.
FIG. 5
a partial perspective sectional view of both the tappet and the associated anti-rotation element of the valve tappet device according to a second, latching devices having embodiment of the invention;
FIG. 6
an axial sectional view for explaining the structure of the anti-rotation element of Figure 5;
FIG. 7
a perspective view of the anti-rotation element of the valve tappet device according to Figures 5 and 6.

Die in Figur 1 dargestellte Ventilstößeleinrichtung umfasst einen Basiskörper 1, dessen Mantelabschnitt 2 eine Führungsfläche 3 bildet, zur Führung des Basiskörpers 1 entlang einer Oszillationsachse X.The valve tappet device illustrated in FIG. 1 comprises a base body 1, whose shell section 2 forms a guide surface 3, for guiding the base body 1 along an oscillation axis X.

An dem Basiskörper 1 ist ein Verdrehsicherungselement 4 angebracht, zur Unterbindung einer Dreh- oder Schwenkbewegung des Basiskörpers 1 um jene Oszillationsachse X, wobei das Verdrehsicherungselement einen in radialer Richtung über den Mantelabschnitt überstehenden Führungskörper bildet.An anti-rotation element 4 is attached to the base body 1 in order to prevent a rotational or pivoting movement of the base body 1 about those oscillation axis X, wherein the anti-rotation element forms a guide body protruding over the jacket portion in the radial direction.

Der Basiskörper 1 ist mit einem Kopfabschnitt 7 versehen. Der Kopfabschnitt 7 bildet eine Nockenkontaktzone 8. Die Nockenkontaktzone 8 ist bei diesem Ausführungsbeispiel als eine in einer Nockenwellenradialebene E ballig gekrümmte Nockenkontaktfläche ausgebildet. Der Basiskörper 1 bildet im Zusammenspiel mit dem Verdrehsicherungselement 4 eine Tassenstößeleinrichtung für einen Ventiltrieb mit oben liegenden Nockenwellen und schräg angestellten Ventilen.The base body 1 is provided with a head portion 7. The head portion 7 forms a cam contact zone 8. The cam contact zone 8 is formed in this embodiment as a crowned in a camshaft radial plane E cam contact surface. The base body 1, in cooperation with the anti-rotation element 4, forms a bucket tappet device for a valve drive with overhead camshafts and obliquely set valves.

Wie aus Figur 2 in Verbindung mit Figur 3 hervorgeht, zeichnet sich die Ventilstößeleinrichtung dadurch aus, dass das Verdrehsicherungselement 4 einen ersten Eingriffsvorsprung 5 und einen hiervon in Oszillationsrichtung beabstandeten zweiten Eingriffsvorsprung 6 umfasst, und dass der Mantelabschnitt 2 mit einer dem ersten Eingriffsabschnitt 5 zugeordneten ersten Radialbohrung Rb1 und einer dem zweiten Eingriffsabschnitt 6 zugeordneten zweiten Radialbohrung Rb2 versehen ist, und der erste Eingriffsabschnitt wie auch der zweite Eingriffsabschnitt 5, 6 jeweils radial zur Oszillationsachse (X) in die ihm zugeordnete Radialbohrung Rb1, Rb2 eintaucht.As can be seen from FIG. 2 in conjunction with FIG. 3, the valve tappet device is characterized in that the anti-rotation locking element 4 has a first Engaging projection 5 and a second engagement projection 6 spaced therefrom in the oscillation direction, and that the skirt portion 2 is provided with a first radial bore Rb1 associated with the first engagement portion 5 and a second radial bore Rb2 associated with the second engagement portion 6, and the first engagement portion as well as the second engagement portion 5, 6 in each case radially to the oscillation axis (X) in its associated radial bore Rb1, Rb2 dips.

Der erste Eingriffsabschnitt 5 und der zweite Eingriffsabschnitt 6 sind in den jeweiligen Radialbohrungen Rb1, Rb2 derart aufgenommen, dass das Verdrehsicherungselement 4 sowohl in Oszillationsrichtung als auch in Umfangsrichtung des Mantelabschnitts 2 im wesentlichen spielfrei mit dem Mantelabschnitt 2 gekoppelt ist.The first engagement portion 5 and the second engagement portion 6 are received in the respective radial bores Rb1, Rb2 such that the anti-rotation element 4 is coupled to the shell portion 2 substantially free of play both in the oscillation direction and in the circumferential direction of the shell portion 2.

Der erste Eingriffsabschnitt 5, sowie der zweite Eingriffsabschnitt 6 sind als Zylinderzapfen ausgebildet und weisen in einer zur Oszillationsachse (X) parallelen Schnittebene einen kreisförmigen Querschnitt auf. Beide Zylinderzapfen haben jeweils den gleichen Durchmesser.The first engagement portion 5, and the second engagement portion 6 are formed as a cylindrical pin and have in a direction of the axis of oscillation (X) parallel cutting plane on a circular cross-section. Both cylinder pins each have the same diameter.

Das Überstandsmaß I (Fig.3) eines sich über die Sitzfläche S erhebenden und zur Oszillationsachse X vordringenden Bereichs des ersten oder zweiten Eingriffsabschnitts 5, 6 entspricht vorzugsweise wenigstens der Wanddicke t (Fig.2) des Mantelabschnitts 2. Im Fußbereich Fb des jeweiligen Eingriffsabschnitts 5, 6 ist der Übergang in die Sitzfläche S derart gestaltet, dass das Verdrehsicherungselement 4 zuverlässig mit seiner Sitzfläche S auf dem Mantelabschnitt 2 aufsitzen kann. Bei diesem Ausführungsbeispiel ist der Übergang als Freistich ausgeführt.The supernatant dimension I (FIG. 3) of a region of the first or second engagement section 5, 6 which projects over the seating surface S and projects towards the oscillation axis X preferably corresponds at least to the wall thickness t (FIG. 2) of the jacket section 2. In the foot region Fb of the respective engagement section 5, 6, the transition into the seat S is designed such that the anti-rotation element 4 can sit reliably with its seat S on the shell portion 2. In this embodiment, the transition is executed as an undercut.

Wie aus Figur 4 hervorgeht, weist der Führungskörper des Verdrehsicherungselementes 4 in einer zur Oszillationsachse X senkrechten Schnittebene einen kreissegmentartigen Querschnitt Q auf. Der Führungskörper ist aus einem Kunststoffmaterial gefertigt und wie durch das Pfeilsymbol P angedeutet, radial an den Mantelabschnitt 2 ansetzbar. Bedingt durch die zur Führung des Tassenstößels zylinderkopfseitig vorgesehenen Führungsstrukturen, insbesondere eine zur Aufnahme des Verdrehsicherungselementes vorgesehene Gleitnut, ist das Verderehsicherungselement in Einbauposition verliersicher mit dem Mantelabschnitt 2 gekoppelt.As can be seen from FIG. 4, the guide body of the anti-rotation element 4 has a circular segment-like cross-section Q in a sectional plane perpendicular to the oscillation axis X. The guide body is made of a plastic material and as indicated by the arrow symbol P, radially attachable to the shell portion 2. Due to the guidance of the tappet cylinder head side provided guide structures, in particular one for receiving the anti-rotation element provided sliding groove, the Verderehsicherungselement is in the installed position captive coupled to the shell portion 2.

In Figur 5 ist eine weitere Variante eines verdrehgesicherten Tassenstößels dargestellt. Bei dieser Ausführungsform ist das Verdrehsicherungselement 4 im Bereich des ersten Eingriffsabschnittes 5 und im Bereich des zweiten Eingriffsabschnittes 6 mit den Mantelabschnitt 2 hintergreifenden Fixierstrukturen 5a, 6a versehen.FIG. 5 shows a further variant of a non-rotating cup tappet. In this embodiment, the anti-rotation element 4 in the region of the first engagement portion 5 and in the region of the second engagement portion 6 with the shell portion 2 engages behind fixing structures 5a, 6a.

Die Fixierstrukturen 5a, 6a sind als Rasteinrichtungen ausgebildet und weisen jeweils eine den Mantelabschnitt 2 hintergreifende Raststruktur 5b, 6b auf. Die Raststruktur 5b, 6b ist jeweils an einem elastisch nachgiebigen Armabschnitt 5c, 6c angebracht. Der Armabschnitt 5c, 6c ist in Einbauposition in der ihm zugeordneten Radialbohrung Rb1, Rb2 angeordnet.The fixing structures 5a, 6a are designed as latching devices and each have a latching structure 5b, 6b engaging behind the casing section 2. The latching structure 5b, 6b is in each case attached to an elastically yielding arm section 5c, 6c. The arm section 5c, 6c is arranged in the installed position in its associated radial bore Rb1, Rb2.

In Figur 6 ist das Verdrehsicherungselement nach Figur 5 als Einzelteil vergrößert dargestellt. Die Anordnung und Gestaltung der Fixierstrukturen 5a, 6a ist derart getroffen, dass sich die Armabschnitte 5c, 6c innerhalb des durch die Radialbohrungen Rb1, Rb2 (Fig.) definierten Hüllkreises befinden. Die Armabschnitte 5c, 6c werden beim Ansetzen des Verdrehsicherungselementes 4 an den Mantelabschnitt 2 zunächst wie durch die Pfeile P2 und P3 angedeutet ausgelenkt. Sobald die durch die Raststrukturen 5b, 6b bereitgestellten Rastflächen R hinter der Innenfläche des Mantelabschnitts 2 zu liegen kommen, werden diese elastisch in die hier gezeigte Position zurückgeschwenkt und hintergreifen hierbei den zwischen den Radialbohrungen Rb1, Rb2 definierten Bereich des Mantelabschnitts 2.In Figure 6, the anti-rotation element of Figure 5 is shown enlarged as a single part. The arrangement and design of the fixing structures 5a, 6a is such that the arm sections 5c, 6c are located within the enveloping circle defined by the radial bores Rb1, Rb2 (FIG. The arm portions 5c, 6c are first deflected when attaching the anti-rotation element 4 to the shell portion 2 as indicated by the arrows P2 and P3. As soon as the latching surfaces R provided by the latching structures 5b, 6b come to lie behind the inner surface of the casing section 2, they are elastically swung back into the position shown here and engage behind the area of the casing section 2 defined between the radial bores Rb1, Rb2.

Um eine ausreichende Bewegungsfreiheit für die Armelemente 5c, 6c zu schaffen sind entsprechende Freispalte 5d, 6d in den Einsatzabschnittten 5, 6 ausgebildet.In order to provide sufficient freedom of movement for the arm elements 5c, 6c, corresponding free gaps 5d, 6d are formed in the insert sections 5, 6.

Das hier gezeigte Verdrehsicherungselement 4 kann im Rahmen eines Spritzschrittes aus einem Kunststoffmaterial gefertigt werden. Die hier gezeigte Ausführungsform kann durchein schieberfreies Werkzeug hergestellt werden, indem die die Rastflächen definierende Formwand eines Formwerkzeuges, durch die Stirnfläche eines Stempels definiert wird, der unter Bildung einer Stempelöffnung ST eine zur Bildung des Führungskörpers an sich vorgesehenen Formraum durchsetzt. Der Verlauf einer entsprechenden Werkzeugtrennebene WZ ist in Figur 6 durch Strichpunktlinien angedeutet.The anti-rotation element 4 shown here can be manufactured from a plastic material as part of an injection step. The embodiment shown here can be produced by a slide-free tool by defining the locking surfaces defining mold wall of a mold, through the end face of a punch, which passes through a forming space to form a punch opening ST provided for forming the guide body. Of the Course of a corresponding mold parting plane WZ is indicated in Figure 6 by dashed lines.

In Figur 7 ist in Form einer perspektivischen Darstellung das Verdrehsicherungselement 4 nach Figur 6 mit Blick auf die darin ausgebildete Stempelöffnung ST sowie die hierin liegenden Rastflächen R dargestellt. Es ist möglich, in diese Stempelöffnung ein Einsatzelement einzusetzen, durch welches der Rastmechanismus in Verriegelungsstellung gesichert wird.FIG. 7 illustrates, in the form of a perspective view, the anti-rotation element 4 according to FIG. 6 with a view of the stamp opening ST formed therein and the latching surfaces R located therein. It is possible to use in this punch opening an insert element, by which the latching mechanism is secured in the locked position.

Alternativ zu der vorangehend beschrieben Ausführungsform ist es auch möglich, einen Rastmechanismus anderweitig, beispielsweise durch an den Stirnenden der Eingriffsabschnitte 5, 6 umlaufende Rastkanten zu verwirklichen.As an alternative to the embodiment described above, it is also possible to realize a latching mechanism in another way, for example by latching edges encircling the front ends of the engagement sections 5, 6.

Es ist auch möglich, die Eingriffsabschnitte 5, 6 im Innenbereich des Mantelabschnitts 2 plastisch, insbesondere durch Ultraschallschmelzen, umzuformen. Es ist weiterhin auch möglich, die Raststrukturen derart auszubilden, dass das Verdrehsicherungselement 4 unter vorübergehender elastischer Verformung insbesondere Stauchung, Biegung oder Weitung mit dem Basiskörper 1 in Rasteingriff gelangt.It is also possible to plastically reshape the engagement sections 5, 6 in the inner region of the jacket section 2, in particular by ultrasonic melting. It is also also possible to form the latching structures in such a way that the anti-rotation locking element 4 comes into latching engagement with the base body 1 under temporary elastic deformation, in particular compression, bending or widening.

Die zur Aufnahme der Eingriffsorgane des Verdrehsicherungselementes 4 an dem Basiskörper 1 vorgesehenen Radialbohrungen Rb1, Rb2 können im Rahmen der Fertigung des Basiskörpers 1, insbesondere bei einem Schleifvorgang als Spann- oder Positionierflächen dienen.The radial bores Rb1, Rb2 provided for receiving the engagement elements of the anti-rotation element 4 on the base body 1 can serve as clamping or positioning surfaces in the context of the production of the base body 1, in particular during a grinding process.

Obgleich die Erfindung vorangehend in Verbindung mit einer Stößeleinrichtung beschrieben wurde, bei welcher lediglich ein Verdrehsicherungselement zur erfindungsgemäßen Bewerkstelligung einer Linearführung vorgesehen ist, ist es auch möglich, mehrere derartige, beispielsweise zwei einander diametral gegenüberliegende, oder anderweitig angeordnete, vorzugsweise in Umfangsrichtung äquidistant angeordnete Verdrehsicherungselemente vorzusehen. Das Laufspiel des Verdrehsicherungselementes in der zugeordneten Führungsnut kann derart großzügig bemessen sein, dass kleinere Schwenkbewegungen des Tassenstößels, insbesondere zugunsten einer optimalen Kontaktflächenausrichtung möglich sind.Although the invention has been described above in connection with a plunger device in which only one anti-rotation element is provided for accomplishing a linear guide according to the invention, it is also possible to provide a plurality of such anti-rotation elements, for example two diametrically opposed, or otherwise arranged, preferably equidistantly arranged in the circumferential direction , The running play of the anti-rotation element in the associated guide groove can be dimensioned so generously that smaller pivoting movements of the bucket tappet, in particular in favor of an optimal contact surface alignment are possible.

Claims (23)

  1. A valve tappet arrangement comprising
    - a base member (1),
    - a jacket portion (2) forming a guide surface (3) for guiding the base member (1) along an oscillation axis (X), and
    - an anti-rotation element (4) for preventing rotary or swivelling motion around the oscillation axis (X), wherein the anti-rotation element (4) has a seat surface resting on the jacket portion and also has a guide member which projects in the radial direction over the jacket portion (2), characterised in that the anti-rotation element (4) has a first engagement projection (5) and a second engagement projection (6) at a distance from the first in the direction of oscillation, and the jacket portion (2) has a first radial bore (Rb1) associated with the first engagement portion (5) and a second radial bore (Rb2) associated with the second engagement portion, and the first engagement portion (5) and the second engagement portion (6) each extend radially relative to the oscillation axis (X) into the associated radial bore (Rb1, Rb2).
  2. A valve tappet arrangement according to claim 1, characterised in that the first engagement portion (5) and the second engagement portion (6) are so received in the respective radial bores (Rb 1, Rb2) that the anti-rotation element (4) is coupled to the jacket portion (2) substantially without clearance, both in the direction of oscillation and in the peripheral direction of the jacket portion (2).
  3. A valve tappet arrangement according to claim 1 or claim 2, characterised in that the first engagement portion (5) and the second engagement portion (6) are cylindrical plugs.
  4. A valve tappet arrangement according to at least one of claims 1 to 3, characterised in that the first engagement portion (5) and the second engagement portion (6) are circular in cross-section in a plane parallel to the oscillation axis (X).
  5. A valve tappet arrangement according to at least one of claims 1 to 4, characterised in that the two cylindrical plugs each have the same diameter.
  6. A valve tappet arrangement according to at least one of claim 1 to 5, characterised in that a region of the first or second engagement portion (5, 6) raised above the seat surface and extending towards the oscillation axis (X) projects by an extent (I) at least equal to the wall thickness (t) of the jacket portion (2).
  7. A valve tappet arrangement according to at least one of claims 1 to 6, characterised in that fixing structures (5b, 6b) engaging underneath the jacket portion (2) are formed in the region of the first engagement portion (5) and in the region of the second engagement portion (6).
  8. A valve tappet arrangement according to claim 7, characterised in that the fixing structures (5b, 6b) are catch arrangements.
  9. A valve tappet arrangement according to claim 8, characterised in that the catch arrangement has a catch structure (R) which engages underneath the jacket portion (2).
  10. A valve tappet arrangement according to claim 9, characterised in that the catch structure is mounted on an elastically flexible arm portion (5c, 6d).
  11. A valve tappet arrangement according to claim 10, characterised in that the arm portion is disposed in the associated radial bore (Rb1, Rb2).
  12. A valve tappet arrangement according to at least one of claims 1 to 11, characterised in that the anti-rotation element (4) can be brought into engagement with the base member (1) under temporary elastic deformation.
  13. A valve tappet arrangement according to at least one of claims 1 to 12, characterised in that the guide member of the anti-rotation element (4) has a circular segmental cross-section (Q) in a plane at right angles to the oscillation axis (X).
  14. A valve tappet arrangement according to at least one of claims 1 to 13, characterised in that the guide member is made of a plastics material.
  15. A valve tappet arrangement according to at least one of claims 1 to 14, characterised in that the anti-rotation element (4) when installed is non-losably coupled to the base member (1).
  16. A valve tappet arrangement according to at least one of claims 1 to 15, characterised in that the anti-rotation element (4) is positively coupled to the base member (1).
  17. A valve tappet arrangement according to claim 16, characterised in that the positive connection between the anti-rotation element (4) and the base member (1) is obtained by shaping an end region of at least one of the engagement portions (5, 6) extending through the jacket portion (2).
  18. A valve tappet arrangement according to claim 17, characterised in that the positive connection between the anti-rotation element (4) and the base member (1) is obtained by forming a head portion on that engagement portion which extends through the jacket portion (2).
  19. A valve tappet arrangement according to claim 17 or claim 18, characterised in that shaping is effected in conjunction with local softening of at least one of the engagement portions.
  20. A valve tappet arrangement according to at least one of claims 1 to 7, characterised in that the anti-rotation element is injection-moulded on the jacket portion.
  21. A valve tappet arrangement according to at least one of claims 1 to 20, characterised in that the base member (1) has a head portion (7) and the head portion (7) forms a cam contact zone (8).
  22. A valve tappet arrangement according to at least one of claims 1 to 21, characterised in that the cam contact zone (8) is a curved, in particular spherical, contact surface.
  23. A valve tappet arrangement according to at least one of claims 1 to 22, characterised in that the valve tappet arrangement is a bucket tappet.
EP04740400A 2003-07-21 2004-06-26 Valve tappet system, especially anti-rotation bucket tappet having a curved cam follower surface Expired - Fee Related EP1646767B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10332981A DE10332981A1 (en) 2003-07-21 2003-07-21 Valve tappet unit for internal combustion engine has first and second engagement protrusions each entering allocated radial hole in sleeve section and in direction radial to axis of oscillation
PCT/EP2004/007003 WO2005019608A1 (en) 2003-07-21 2004-06-26 Valve tappet system, especially anti-rotation bucket tappet having a curved cam follower surface

Publications (2)

Publication Number Publication Date
EP1646767A1 EP1646767A1 (en) 2006-04-19
EP1646767B1 true EP1646767B1 (en) 2007-02-28

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Application Number Title Priority Date Filing Date
EP04740400A Expired - Fee Related EP1646767B1 (en) 2003-07-21 2004-06-26 Valve tappet system, especially anti-rotation bucket tappet having a curved cam follower surface

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Country Link
US (1) US7146952B2 (en)
EP (1) EP1646767B1 (en)
JP (1) JP2006528296A (en)
DE (2) DE10332981A1 (en)
ES (1) ES2280974T3 (en)
WO (1) WO2005019608A1 (en)

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US7146952B2 (en) 2006-12-12
JP2006528296A (en) 2006-12-14
DE502004003068D1 (en) 2007-04-12
WO2005019608A1 (en) 2005-03-03
DE10332981A1 (en) 2005-02-10
US20060112915A1 (en) 2006-06-01
ES2280974T3 (en) 2007-09-16
EP1646767A1 (en) 2006-04-19

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