EP1466082B1 - Switched cam follower or switched support element of a valve gear of an internal combustion engine - Google Patents

Switched cam follower or switched support element of a valve gear of an internal combustion engine Download PDF

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Publication number
EP1466082B1
EP1466082B1 EP03729438A EP03729438A EP1466082B1 EP 1466082 B1 EP1466082 B1 EP 1466082B1 EP 03729438 A EP03729438 A EP 03729438A EP 03729438 A EP03729438 A EP 03729438A EP 1466082 B1 EP1466082 B1 EP 1466082B1
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EP
European Patent Office
Prior art keywords
coupling
coupling means
opening
cam follower
support element
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Expired - Lifetime
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EP03729438A
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German (de)
French (fr)
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EP1466082A1 (en
Inventor
Walter Speil
Henning Karbstein
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IHO Holding GmbH and Co KG
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Schaeffler KG
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    • 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
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • 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
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction

Definitions

  • the invention relates to a switchable cam follower or a switchable support member of a valve train of an internal combustion engine, with an outer part, which is assembled with a cam in this direction relatively movable inner part, wherein the inner part at its separation gap to Au- vanteil two spaced apart or opposite openings for Coupling medium has, which openings in a Nockengrund Vietnamese to a further opening for the coupling medium in the outer part are aligned, wherein the coupling means are designed and arranged such that when coupling one on a coupling side the separating gap so engages over that it simultaneously in the opening of the outer and inner part runs.
  • Such a cam follower shown here as a turn-off rocker arm, goes out of the class considered as generic US 6,321,705 B1 out.
  • the disadvantage of this is that on both coupling sides a relatively high production cost must be operated. So both coupling sides must be made extremely accurate with respect to the radial clearance (free travel of the coupling means in its opening in Nockenhubides) and a play tolerance. Likewise, only the slightest form deviations are permitted. Also, it is not clear immediately upon reaching the coupling status on a coupling side which radial clearance then prevails on this side.
  • There is a switchable cam follower which is constructed relatively complex. The double accuracy increases the system risk on the coupling sides.
  • the object of the invention is therefore to provide a cam follower or a support element of the aforementioned type, in which the cited disadvantages are eliminated and in particular in its coupling region simpler and cheaper to produce, at the same time secure coupling.
  • the coupling is thus designed so that always first the coupling means of the other, fine toleranced coupling side in the corresponding opening and that only on this side at the same time a small radial coupling play exists.
  • cam position for the displacement of the coupling means a base circle contact of the or the associated cam is provided.
  • other lifting positions are also conceivable.
  • the scope of the invention relates in particular to switchable cam followers such as the aforementioned bucket tappet, but also on roller or mushroom tappets for acting on pushrods, on lever-like cam followers, on switching bridges for acting on a plurality of gas exchange valves of equivalent action and on switchable support elements, provided that a two-sided coupling mechanism is used ,
  • the scope of the invention relates to switchable valve train members in which a slider packet is not rectified moves, but in which two similar coupling means are applied, for example, in the inner part, and be displaced radially outward beyond the separating gap for the coupling purpose.
  • a further advantageous embodiment of the invention relates to the fact that the openings are formed as a bore and the coupling means as a piston-like slide.
  • the openings are also conceivable, such as polygonal ones, whereby a variety of coupling means in place of the slides will also be apparent to the person skilled in the art at this point.
  • wedges, balls and the like are also used. thought.
  • the openings in the outer part of the coupling medium are preferably diametrically opposite. However, provision is also made for a circumferential or height direction staggered positioning of this. It is also possible not to make the opening in the inner part as a through hole, but to apply blind holes.
  • the cam follower 1 as disclosed in both figures, consists of a cylindrical outer part 2, in the bore 3 a for this purpose axially movable inner part 4 is installed. Between the inner and the outer part 4, 2 extends an annular separation gap 5.
  • the inner part 4 has two diametrically opposite openings 6, 7, which are connected to a through hole. Both openings 6, 7 have an edge 8, 9.
  • the edges 8, 9 is in a cam position (here base circle run) depending on a further opening 10, 11 for later to be explained coupling means in alignment.
  • the opening 10 on a coupling side 12 has no coupling agent in the decoupling state, whereas is positioned in the opening 11 on another coupling side 13 designed as a piston-like slider coupling means 14.
  • a sleeve-like body 19 is installed within the bore 20, the coupling means 15 extends directly.
  • the opening 11 on the other coupling side 13 for the coupling means 14 also has a sleeve-like body 21, within which bore 22, the coupling medium 14 extends directly.
  • the edge 9 on the sleeve-like body 19 encloses, with sufficient coupling movement of the coupling means 14 in the opening 7, annular and thus all-embracing the coupling means 14.
  • this advantage is not given; however, as will be explained below, this can easily be accepted.
  • a radial play or a tolerance of the radial play of the coupling means 14 on the other coupling side 13 may be precisely designed, whereas a radial clearance or, a play tolerance for the coupling means 15 on the one coupling side 12 is roughly designed.
  • the shape deviation can be designed as mentioned above.
  • the coarser interpretation of the radial clearance on the one coupling side 12 causes in coupling only a slightly higher tilting of the outer to the inner part 2, 4.
  • the radial clearance is determined by the other, fine-tolerant coupling side 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Transmission Devices (AREA)

Abstract

A switchable cam follower ( 1 ) or a switchable support element of a valve train of an internal combustion engine, said cam follower or support element comprising an outer part ( 2 ) which is assembled together with an inner part ( 4 ) that is displaceable relative thereto in a direction of cam lift, said inner part ( 4 ) comprising, at a parting gap ( 5 ) to the outer part ( 2 ), two spaced apart or opposing openings ( 6, 7 ) for coupling means, each of said openings ( 6, 7 ) being aligned, at one cam position, to a further opening ( 10, 11 ) for coupling means in the outer part ( 2 ), the coupling means being configured and arranged so that, in a coupled state, each coupling means extends beyond the parting gap ( 5 ) on one coupling side ( 12, 13 ) while simultaneously extending in the opening ( 10, 6 ) of the outer and the inner part ( 2, 4 ) which in an uncoupled position of the coupling means ( 14, 15 ), an axial idle stroke of the coupling means ( 15 ) on the one coupling side ( 12 ) till coupling is achieved is large and the axial idle stroke of the coupling means ( 14 ) on the further coupling side ( 13 ) till coupling is achieved is small. In this way, a switchable cam follower ( 1 ) or a switchable support element is crated in which the manufacturing costs, the complexity and also the risk of faulty couplings are drastically reduced.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen schaltbaren Nockenfolger oder ein schaltbares Abstützelement eines Ventiltriebs einer Brennkraftmaschine, mit einem Außenteil, welches mit einem in Nockenhubrichtung zu diesem relativ beweglichen Innenteil zusammengebaut ist, wobei das Innenteil an dessen Trennspalt zum Au-ßenteil zwei voneinander beabstandete oder sich gegenüberliegende Öffnungen für Koppel mittel besitzt, welche Öffnungen bei einer Nockengrundkreisstellung zu je einer weiteren Öffnung für die Koppel mittel im Außenteil fluchten, wobei die Koppelmittel derartig ausgebildet und angeordnet sind, dass bei Kopplung je eines auf einer Koppelseite den Trennspalt derartig übergreift, dass es gleichzeitig in der Öffnung des Außen- und Innenteils verläuft.The invention relates to a switchable cam follower or a switchable support member of a valve train of an internal combustion engine, with an outer part, which is assembled with a cam in this direction relatively movable inner part, wherein the inner part at its separation gap to Au-ßenteil two spaced apart or opposite openings for Coupling medium has, which openings in a Nockengrundkreisstellung to a further opening for the coupling medium in the outer part are aligned, wherein the coupling means are designed and arranged such that when coupling one on a coupling side the separating gap so engages over that it simultaneously in the opening of the outer and inner part runs.

Hintergrund der ErfindungBackground of the invention

Ein derartiger Nockenfolger, hier als abschaltbarer Schlepphebel dargestellt, geht aus der als gattungsbildend betrachteten U.S. 6,321,705 B1 hervor. Nachteilig ist es bei diesem, dass auf beiden Koppelseiten ein relativ hoher Fertigungsaufwand betrieben werden muss. So müssen beide Koppelseiten äußerst genau hinsichtlich des radialen Spiels (Leerweg des Koppelmittels in seiner Öffnung in Nockenhubrichtung) und einer Spieltoleranz gefertigt werden. Gleichfalls werden nur geringste Formabweichungen zugelassen. Auch ist unmittelbar bei Erreichen des Koppelstatus an einer Koppelseite nicht klar, welches radiale Spiel dann an dieser Seite vorherrscht. Es liegt ein schaltbarer Nockenfolger vor, welcher relativ komplex aufgebaut ist. Durch die zweifache Genauigkeit steigt das Systemrisiko an den Koppelseiten.Such a cam follower, shown here as a turn-off rocker arm, goes out of the class considered as generic US 6,321,705 B1 out. The disadvantage of this is that on both coupling sides a relatively high production cost must be operated. So both coupling sides must be made extremely accurate with respect to the radial clearance (free travel of the coupling means in its opening in Nockenhubrichtung) and a play tolerance. Likewise, only the slightest form deviations are permitted. Also, it is not clear immediately upon reaching the coupling status on a coupling side which radial clearance then prevails on this side. There is a switchable cam follower, which is constructed relatively complex. The double accuracy increases the system risk on the coupling sides.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, einen Nockenfolger oder ein Abstützelement der vorgenannten Art zu schaffen, bei welchem die zitierten Nachteile beseitigt sind und der insbesondere in seinem Koppelbereich einfacher aufgebaut und billiger herstellbar ist, bei gleichzeitig sicherer Kopplung.The object of the invention is therefore to provide a cam follower or a support element of the aforementioned type, in which the cited disadvantages are eliminated and in particular in its coupling region simpler and cheaper to produce, at the same time secure coupling.

Zusammenfassung der ErfindungSummary of the invention

Erfindungsgemäß wird diese Aufgabe durch die neuen Merkmale des Anspruchs 1 gelöst. Demnach soll einerseits in einer Entkoppelstellung der Koppelmittel ein axialer Leerweg des Koppelmittels auf der einen Koppelseite bis zur Kopplung groß und ein axialer Leerweg des Koppelmittels auf der anderen Koppelseite bis zur Kopplung klein ausgelegt ist und wobei andererseits ein radiales Spiel, allein oder gemeinsam mit einer Toleranz des radialen Spiels, des Koppelmittels auf der einen Koppelseite in Bezug auf dessen Öffnung groß und ein radiales Spiel, allein oder gemeinsam mit einer Toleranz des radialen Spiels, des Koppelmittels auf der anderen Koppelseite in Bezug auf dessen Öffnung klein ausgebildet ist.According to the invention this object is achieved by the novel features of claim 1. Accordingly, on the one hand in a Entkoppelstellung the coupling means an axial free travel of the coupling means on the one coupling side to the coupling is large and an axial free travel of the coupling means on the other coupling side to the coupling is designed small and on the other hand, a radial clearance, alone or together with a tolerance the radial play, the coupling means on the one coupling side with respect to the opening of which is large and a radial clearance, alone or together with a tolerance of the radial clearance of the coupling means on the other coupling side with respect to its opening is small.

Somit wird ein großer Fertigungsaufwand nur noch an der anderen Koppelseite betrieben, wohingegen die eine Koppelseite gleichzeitig hinsichtlich des axialen Leerwegs und des radialen Spiels (radiales Spiel = Leerweg des Koppelmittels in seiner Öffnung in Nockenhubrichtung) entfeinert ist. Der Fertigungsaufwand und die Kosten lassen sich somit drastisch senken, ohne nennenswerte Beeinflussung der Eigenschaften des Nockenfolgers oder Abstützelements.Thus, a large manufacturing effort is only operated on the other coupling side, whereas the one coupling side at the same time with respect to the axial free travel and the radial clearance (radial clearance = free travel of the coupling means in its opening in Nockenhubrichtung) is deferred. The production costs and the costs can thus be drastically reduced, without significantly influencing the properties of the cam follower or support element.

Die Kopplung ist hierdurch so ausgelegt, dass stets zuerst das Koppelmittel der anderen, feintolerierten Koppelseite in der entsprechenden Öffnung verläuft und dass nur auf dieser Seite gleichzeitig ein kleines radiales Koppelspiel vorliegt.The coupling is thus designed so that always first the coupling means of the other, fine toleranced coupling side in the corresponding opening and that only on this side at the same time a small radial coupling play exists.

Der denkbare mögliche negative Effekt einer Fehlschaltung, beispielsweise bei nicht genügend ausgefahrenem Koppelmittel trotz ausgelöstem Koppelbefehl, mit dem Ergebnis des Herausrutschens des Koppelmittels und einer starken Überlastung der tragenden Bauteile, ist nicht mehr möglich. Definiert trägt somit zuerst das Koppelmittel auf der anderen Koppelseite, das auch hier nur einen geringen Leerweg in Nockenhubrichtung vollzieht, und anschließend nach ausgelöstem Koppelbefehl erst das Koppelmittel der einen Koppelseite.The conceivable possible negative effect of a faulty circuit, for example in the case of insufficiently extended coupling means despite triggered coupling command, with the result of slipping out of the coupling agent and a strong overload of the supporting components, is no longer possible. Defined carries thus first the coupling means on the other coupling side, which takes place here only a small free travel in Nockenhubrichtung, and then after triggered coupling command only the coupling means of a coupling side.

Durch die gleichzeitige "Entfeinerung" des radialen Spiel des Koppelmittels (Leerweg in Nockenhubrichtung) auf der einen Koppelseite ist ein weiterer Beitrag in Richtung Minimierung der Fertigungskosten geleistet. Sobald jedoch das geringe radiale Spiel an der "feinen" anderen Koppelseite überwunden ist, erfolgt eine gewünschte Hubübertragung. Somit ist das radiale Spiel an der gröber tolerierten Koppelseite nicht maßgebend. Dieses bewirkt lediglich eine geringfügig höhere Verkippung des Außen- zum Innenteils, welche akzeptabel ist.Due to the simultaneous "refining" of the radial play of the coupling means (free travel in the cam lifting direction) on the one coupling side, another contribution is made in the direction of minimizing the production costs. However, as soon as the small radial clearance on the "fine" other coupling side is overcome, a desired stroke transmission takes place. Thus, the radial clearance on the coarser tolerated coupling side is not relevant. This causes only a slightly higher tilt of the outer to the inner part, which is acceptable.

Als Nockenstellung zur Verlagerung der Koppelmittel ist ein Grundkreiskontakt des oder der zugeordneten Nocken vorgesehen. Denkbar sind jedoch auch andere Hubstellungen.As cam position for the displacement of the coupling means, a base circle contact of the or the associated cam is provided. However, other lifting positions are also conceivable.

Im Falle von rotationssymmetrischen Nockenfolgern wie Tassenstößeln, Rollenstößeln bzw. von rotationssymmetrischen Abstützelementen beläßt man gemäß einem weiteren Vorschlag der Erfindung zumindest einen Rand der Öffnung auf der einen, grobtolerierten Koppelseite einfach zylindrisch. Der Rand für das Koppelmittel auf der anderen, feintolerierten Koppelseite kann vorschlagsgemäß abgeflacht ausgeführt werden, muß jedoch nicht. So werden hier wiederum Fertigungskosten für das Anfertigen einer Planfläche zumindest an einer Koppelseite eingespart. Auf der anderen Koppelseite erfolgt bei Applizierung der Planfläche und ausreichendem Verfahrweg des entsprechenden Koppelmittels, über den Rand der vorgelagerten Öffnung hinweg, sofort ein allumfassendes Umschließen des Koppelmittels mit hervorragenden Trageeigenschaften.In the case of rotationally symmetrical cam followers such as bucket tappets, roller tappets or rotationally symmetrical support elements is left according to a further proposal of the invention, at least one edge of the opening on the one coarse tolerant coupling side simply cylindrical. The edge for the coupling agent on the other, fine-toleranced coupling side can be executed according to the proposal flattened, but does not have to. Thus, in turn, manufacturing costs for the production of a plane surface are saved here, at least on one coupling side. On the other coupling side takes place when Applizierung the flat surface and sufficient travel of the corresponding coupling means, beyond the edge of the upstream opening away, immediately an all-encompassing enclosing the coupling agent with excellent wearing properties.

Der Schutzbereich der Erfindung bezieht sich insbesondere auf schaltbare Nockenfolger wie den genannten Tassenstößel, jedoch auch auf Rollen- bzw. Pilzstößel zur Beaufschlagung von Stößelstangen, auf hebelartige Nockenfolger, auf Schaltbrücken zur Beaufschlagung mehrerer gleichwirkender Gaswechselventile und auf schaltbare Abstützelemente, sofern ein zweiseitiger Koppelmechanismus verwendet wird.The scope of the invention relates in particular to switchable cam followers such as the aforementioned bucket tappet, but also on roller or mushroom tappets for acting on pushrods, on lever-like cam followers, on switching bridges for acting on a plurality of gas exchange valves of equivalent action and on switchable support elements, provided that a two-sided coupling mechanism is used ,

Auch bezieht sich der Schutzbereich der Erfindung auf schaltbare Ventiltriebsglieder bei denen nicht ein Schieberpaket gleichgerichtet bewegt wird, sondern bei denen zwei gleichartige Koppelmittel appliziert sind, beispielsweise im Innenteil, und radial nach außen über den Trennspalt hinweg für den Koppelzweck verlagert werden.Also, the scope of the invention relates to switchable valve train members in which a slider packet is not rectified moves, but in which two similar coupling means are applied, for example, in the inner part, and be displaced radially outward beyond the separating gap for the coupling purpose.

Eine weitere vorteilhafte Ausgestaltung der Erfindung bezieht sich darauf, dass die Öffnungen als Bohrung und die Koppelmittel als kolbenartige Schieber ausgebildet sind. Denkbar sind jedoch auch weitere Ausgestaltungen der Öffnungen wie mehrkantartige, wobei sich dem Fachmann an dieser Stelle ebenfalls eine Vielzahl von Koppelmitteln anstelle der Schieber erschließen. So ist beispielsweise auch an Keile, Kugeln u.ä. gedacht.A further advantageous embodiment of the invention relates to the fact that the openings are formed as a bore and the coupling means as a piston-like slide. However, other embodiments of the openings are also conceivable, such as polygonal ones, whereby a variety of coupling means in place of the slides will also be apparent to the person skilled in the art at this point. For example, wedges, balls and the like are also used. thought.

Aufgrund der separaten Hülsen gemäß einem weiteren Unteranspruch erübrigt sich eine aufwändige Feinbearbeitung der Laufbahnen für die Koppelmittel am Nockenfolger selbst.Due to the separate sleeves according to another subclaim, a complex finishing of the raceways for the coupling means on the cam follower itself is unnecessary.

In Konkretisierung der Erfindung ist ausgeführt, das Außenteil ringförmig auszubilden und in dessen Bohrung das Innenteil zu applizieren. Es ist jedoch klar, dass der Schutzbereich dieser Erfindung sich nicht nur auf rotationssymmetrische Nockenfolger bzw. Abstützelemente bezieht. So können auch nebeneinanderliegende Nockenfolgerteile wie Hebel vorgesehen sein.In concretization of the invention is designed to form the outer part annular and to apply in the bore of the inner part. However, it will be understood that the scope of this invention is not limited to rotationally symmetric cam followers or support members. Thus, adjacent cam follower parts such as levers can be provided.

Die Öffnungen im Außenteil für die Koppel mittel liegen sich bevorzugterweise diametral gegenüber. Vorgesehen ist jedoch auch eine in Umfangs- oder Höhenrichtung versetzte Positionierung dieser. Auch ist es möglich, die Öffnung im Innenteil nicht als Durchgangsbohrung zu fertigen, sondern Sackbohrungen zu applizieren.The openings in the outer part of the coupling medium are preferably diametrically opposite. However, provision is also made for a circumferential or height direction staggered positioning of this. It is also possible not to make the opening in the inner part as a through hole, but to apply blind holes.

Schließlich kann es auch vorgesehen sein, auf die Anflachung des einen Randes zu verzichten, sofern das entsprechende Koppelmittel verdrehgesichert in seiner Öffnung geführt ist und stirnseitig, d. h. in Koppelrichtung, von seiner Geometrie her komplementär zur gegenüberliegenden Fläche ist.Finally, it can also be provided to dispense with the flattening of the one edge, provided that the corresponding coupling means is guided against rotation in its opening and the front side, d. H. in the coupling direction, is complementary in geometry to the opposite surface.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Erfindung ist zweckmäßigerweise anhand der Zeichnung näher erklärt. Es zeigen:

Figur 1
einen Längsschnitt durch einen als Tassenstößel ausgebildeten schaltbaren Nockenfolger im Bodenbereich und
Figur 2
einen Schnitt nach der Linie II-II der Figur 1.
The invention is expediently explained in more detail with reference to the drawing. Show it:
FIG. 1
a longitudinal section through a designed as a bucket tappet switchable cam follower in the floor area and
FIG. 2
a section along the line II-II of FIG. 1 ,

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing Zum Aufbau:To build:

Der Nockenfolger 1, wie in beiden Figuren offenbart, besteht aus einem zylindrischen Außenteil 2, in dessen Bohrung 3 ein hierzu relativ axial bewegliches Innenteil 4 eingebaut ist. Zwischen dem Innen- und dem Außenteil 4, 2 verläuft ein ringförmiger Trennspalt 5. Das Innenteil 4 hat zwei sich diametral gegenüberliegende Öffnungen 6, 7, die zu einer Durchgangsbohrung verbunden sind. Beide Öffnungen 6, 7 haben einen Rand 8, 9. Den Rändern 8, 9 liegt in einer Nockenstellung (hier Grundkreisdurchlauf) je eine weitere Öffnung 10, 11 für später zu erläuternde Koppelmittel fluchtend gegenüber. Die Öffnung 10 auf einer Koppelseite 12 weist im Entkoppelzustand kein Koppelmittel auf, wohingegen in der Öffnung 11 auf einer anderen Koppelseite 13 ein als kolbenartiger Schieber ausgebildetes Koppelmittel 14 positioniert ist.The cam follower 1, as disclosed in both figures, consists of a cylindrical outer part 2, in the bore 3 a for this purpose axially movable inner part 4 is installed. Between the inner and the outer part 4, 2 extends an annular separation gap 5. The inner part 4 has two diametrically opposite openings 6, 7, which are connected to a through hole. Both openings 6, 7 have an edge 8, 9. The edges 8, 9 is in a cam position (here base circle run) depending on a further opening 10, 11 for later to be explained coupling means in alignment. The opening 10 on a coupling side 12 has no coupling agent in the decoupling state, whereas is positioned in the opening 11 on another coupling side 13 designed as a piston-like slider coupling means 14.

Im Innenteil 4 ist ein als kolbenartiger Schieber ausgebildetes Koppelmittel 15 angeordnet. Es ist zu erkennen, dass das Koppelmittel 15 mit seiner einen Stirnfläche 16 unmittelbar an einer balligen Stirnseite 17 des anderen Koppelmittels 14 im hier gezeigten Entkoppelzustand (bei Nockengrundkreisdurchlauf) anliegt. Im Bereich der einen Koppelseite 12 hingegen ist eine weitere Stirnfläche 18 des Koppelmittels 15 beabstandet zum Trennspalt 5 ausgebildet.In the inner part 4 designed as a piston-like slider coupling means 15 is arranged. It can be seen that the coupling means 15 rests with its one end face 16 directly on a crowned end face 17 of the other coupling means 14 in the decoupling state shown here (in Nockengrundkreisdurchlauf). In the area of one coupling side 12, however, a further end face 18 of the coupling means 15 is spaced from the separating gap 5.

Des weiteren kann sich der Fachmann den Figuren entnehmen, dass in den zu einer Durchgangsbohrung verbundenen Öffnungen 6, 7 des Innenelements 4 ein hülsenartiger Körper 19 eingebaut ist, innerhalb dessen Bohrung 20 das Koppelmittel 15 unmittelbar verläuft. Gleichfalls hat die Öffnung 11 auf der anderen Koppelseite 13 für das Koppelmittel 14 ebenfalls einen hülsenartigen Körper 21, innerhalb dessen Bohrung 22 das Koppel mittel 14 unmittelbar verläuft. Der Rand 9 am hülsenartigen Körper 19 umschließt, bei ausreichender Koppelbewegung des Koppelmittels 14 in die Öffnung 7, ringförmig und somit allumfassend das Koppelmittel 14. Auf der gegenüberliegenden einen Koppelseite 12 hingegen ist dieser Vorteil nicht gegeben; dies kann jedoch, wie nachfolgend erläutert wird, ohne weiteres hingenommen werden.Furthermore, those skilled in the figures can be deduced that in the connected to a through hole openings 6, 7 of the inner member 4, a sleeve-like body 19 is installed within the bore 20, the coupling means 15 extends directly. Likewise, the opening 11 on the other coupling side 13 for the coupling means 14 also has a sleeve-like body 21, within which bore 22, the coupling medium 14 extends directly. The edge 9 on the sleeve-like body 19 encloses, with sufficient coupling movement of the coupling means 14 in the opening 7, annular and thus all-embracing the coupling means 14. On the opposite side of a coupling 12, however, this advantage is not given; however, as will be explained below, this can easily be accepted.

Zur Funktion:To the function:

Es ist aus beiden Figuren ersichtlich, dass in der hier gezeigten Entkoppelstellung der Koppel mittel 14, 15, welche als Schieberpaket fluchtend hintereinander liegen, ein Leerweg des Koppelmittels 15 auf der einen Koppelseite 12 bis zur Kopplung in die Öffnung 10 deutlich größer ist, als derjenige des Koppelmittels 14 auf der anderen Koppelseite 13 bis zum sicheren Einfahren über den Rand 9 und den Trennspalt 5 hinweg in die Öffnung 7 des Innenteils 4. Somit trägt auf jeden Fall zuerst die andere Koppelseite 13, bevor ein sicherer Koppelvorgang auf der einen Koppelseite 12 realisiert ist. Mit anderen Worten gesagt ist der Weg, welchen die Koppelmittel 14, 15 im gewünschten Koppelfall zurücklegen, so ausgelegt, dass stets zuerst das Koppelmittel 14 auf der hinsichtlich des axialen Leerweges feintolerierten anderen Koppelseite 13 trägt, Die deutlich gröber tolerierte eine Koppelseite 12 koppelt erst später. Es ist niemals möglich, dass zuerst die "grobe", am Rand der Öffnung 10 zylindrisch gekrümmte, eine Koppelseite 12 zuerst trägt. Da somit zuerst die präzise, andere Koppelseite 13 gekoppelt ist, welche in den optional flachen Rand 9 der Öffnung 7 verlagert wird, kann es nicht mehr dazu kommen, dass das Koppelmittel 15 aus dem nur zylindrischen Rand der Öffnung 10 mit den lediglich gering tragenden Kanten herausrutscht.It is apparent from both figures that in the decoupling position shown here, the coupling medium 14, 15, which are aligned as a slide package in succession, a free path of the coupling means 15 on the one coupling side 12 to the coupling in the opening 10 is significantly larger than the one of the coupling means 14 on the other coupling side 13 until safe retraction over the edge 9 and the separating gap 5 away in the opening 7 of the inner part 4. Thus, in any case first carries the other coupling side 13 before a secure coupling process realized on the one coupling side 12 is. In other words, the way in which the coupling means 14, 15 in the desired coupling case covered, designed so that always first carries the coupling means 14 on the fine with respect to the axial free travel other coupling side 13, the much coarser tolerated a coupling side 12 couples later. It is never possible that first the "coarse", at the edge of the opening 10 cylindrically curved, a coupling side 12 carries first. Since thus first the precise, other coupling side 13 is coupled, which is displaced in the optional flat edge 9 of the opening 7, it can no longer happen that the coupling means 15 from the only cylindrical edge of the opening 10 with the only low-bearing edges from slipping out.

Somit ist ohne separate Maßnahmen ein erhöhte Bauteilbelastung an diskreten Stellen der Koppelmittel 14, 15 vermieden. Dadurch, dass nur die andere Koppelseite 13 hinsichtlich des axialen Leerweges präzise ausgelegt ist, lassen sich die Fertigungskosten und auch das Systemrisiko im Koppelmechanismus drastisch senken. Zum anderen sinkt auch die Komplexität des Aufbaus.Thus, an increased component load at discrete points of the coupling means 14, 15 is avoided without separate measures. Due to the fact that only the other coupling side 13 is designed precisely with regard to the axial free travel, the manufacturing costs and also the system risk in the coupling mechanism can be drastically reduced. On the other hand, the complexity of the structure also decreases.

Des weiteren kann auch ein radiales Spiel bzw. eine Toleranz des radialen Spiels des Koppelmittels 14 auf der anderen Koppelseite 13 präzise ausgelegt sein, wohingegen ein radiales Spiel bzw, eine Spieltoleranz für das Koppelmittel 15 auf der einen Koppelseite 12 grob ausgelegt ist. Wahlweise kann auch die Formabweichung wie vorgenannt gestaltet werden. Die gröbere Auslegung des radialen Spiels auf der einen Koppelseite 12 bewirkt bei Kopplung eine lediglich geringfügig höhere Verkippung des Außen- zum Innenteils 2, 4. Das radiale Spiel wird von der anderen, feintolerierten Koppelseite 13 bestimmt. Somit erfolgt eine Hubübertragung sofort, wenn das Koppelmittel 14 auf der feintolerierten anderen Koppelseite 13 seinen sehr minimalen Leerweg in nockenferne Richtung innerhalb der Öffnung 7 des Innenteils 4 zurückgelegt hat.Furthermore, a radial play or a tolerance of the radial play of the coupling means 14 on the other coupling side 13 may be precisely designed, whereas a radial clearance or, a play tolerance for the coupling means 15 on the one coupling side 12 is roughly designed. Optionally, the shape deviation can be designed as mentioned above. The coarser interpretation of the radial clearance on the one coupling side 12 causes in coupling only a slightly higher tilting of the outer to the inner part 2, 4. The radial clearance is determined by the other, fine-tolerant coupling side 13. Thus, a stroke transmission takes place immediately when the coupling means 14 has traveled on the fine tolerated other coupling side 13 its very minimal free travel in the cam-distal direction within the opening 7 of the inner part 4.

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11
Nockenfolgercam follower
22
Außenteilouter part
33
Bohrungdrilling
44
Innenteilinner part
55
Trennspaltseparating gap
66
Öffnungopening
77
Öffnungopening
88th
Randedge
99
Randedge
1010
Öffnungopening
1111
Öffnungopening
1212
Koppelseitecoupling side
1313
Koppelseitecoupling side
1414
Koppelmittelcoupling means
1515
Koppelmittelcoupling means
1616
Stirnflächeface
1717
Stirnseitefront
1818
Stirnflächeface
1919
Körperbody
2020
Bohrungdrilling
2121
Körperbody
2222
Bohrungdrilling

Claims (6)

  1. Switchable cam follower (1) or switchable support element of a valve gear of an internal combustion engine, with an outer part (2) which is assembled together with an inner part (4) which is movable relative thereto in the cam lifting direction, wherein the inner part (4) has, at its separating gap (5) from the outer part (2), two spaced-apart or opposite openings (6, 7) for coupling means (14, 15), which openings (6, 7), in a cam base-circle position, are each aligned with a further opening (10, 11) for the coupling means (14, 15) in the outer part (2), wherein the coupling means (14, 15) are designed and arranged in such a manner that, during coupling, each one extends on one coupling side (12, 13) across the separating gap (5) in such a manner that it extends at the same time in the opening (10, 6) of the outer and inner parts (2, 4), wherein, firstly, in a decoupled position of the coupling means (14, 15), there is a large amount of axial free travel of the coupling means (15) on one coupling side (12) until coupling takes place and a small amount of axial free travel of the coupling means (14) on the other coupling side (13) until coupling takes place, and wherein, secondly, a radial play, on its own or together with a tolerance of the radio play, of the coupling means (15) on one coupling side (12) is designed to be large with respect to the opening (10) thereof, and a radial play, on its own or together with a tolerance of the radial play, of the coupling means (14) on the other coupling side (13) is designed to be small with respect to the opening (7) thereof.
  2. Cam follower or support element according to Claim 1, wherein the openings (6, 7, 10, 11) are designed as bores and the coupling means (15, 14) are designed as piston-like slides.
  3. Cam follower or support element according to Claim 2, wherein sleeve-bodies (21, 19) are fitted into the openings (11, 6 and 7), in which the coupling means (14, 15) extend in the case of decoupling, the coupling means (14, 15) being arranged directly within the bores (22, 20) of said sleeve-like bodies.
  4. Cam follower or support element according to Claim 2, wherein the outer part (2) is of annular design, and wherein the inner part (4) extends in the bore (3) thereof.
  5. Cam follower or support element according to Claim 4, wherein only one edge (9) of the opening (7) for the coupling means (14) on the other coupling side (13), into which opening (7) the coupling means (14) penetrates during coupling, is produced as a flat surface.
  6. Cam follower or support element according to one of the preceding claims, wherein a slide assembly comprising a total of two coupling means (14, 15) is used, wherein the openings (6, 7) in the inner part (4) are combined to form a through-bore within which the one coupling means (15) extends at least virtually over its entire length, wherein the other coupling means (14) is fitted into the opening (11) of the other coupling side (13) and has, radially on the inside, a spherical end side (17) as a contact surface for an end surface (16) on the one coupling means (15) in the inner part (4), and wherein, in the case of uncoupling, the end side (17) bears against the end surface (16) during the one cam position.
EP03729438A 2002-01-18 2003-01-10 Switched cam follower or switched support element of a valve gear of an internal combustion engine Expired - Lifetime EP1466082B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10201805 2002-01-18
DE10201805A DE10201805A1 (en) 2002-01-18 2002-01-18 Switchable cam follower or switchable support element of a valve train of an internal combustion engine
PCT/EP2003/000158 WO2003060294A1 (en) 2002-01-18 2003-01-10 Switched cam follower or switched support element of a valve gear of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1466082A1 EP1466082A1 (en) 2004-10-13
EP1466082B1 true EP1466082B1 (en) 2008-03-05

Family

ID=7712484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03729438A Expired - Lifetime EP1466082B1 (en) 2002-01-18 2003-01-10 Switched cam follower or switched support element of a valve gear of an internal combustion engine

Country Status (6)

Country Link
US (1) US7059287B2 (en)
EP (1) EP1466082B1 (en)
AT (1) ATE388307T1 (en)
AU (1) AU2003235625A1 (en)
DE (2) DE10201805A1 (en)
WO (1) WO2003060294A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043182A1 (en) * 2004-09-07 2006-03-30 Ina-Schaeffler Kg Switching cam follower especially for IC engine has inner and outer levers on a coaxial mounting and with a hydraulic control and a cam follower roller
NL2002667C2 (en) * 2009-03-25 2010-09-28 Bolidt Mij Tot Exploitatie Van Kunststoffen En Bouwwerken B V RAILING ELEMENT AND METHOD FOR MANUFACTURING IT
US20120137995A1 (en) * 2010-12-01 2012-06-07 Kia Motors Corporation Direct acting variable valve lift apparatus

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52110313A (en) * 1976-03-12 1977-09-16 Toyota Motor Corp Suction/exhaust valve operation mechanism for internal-combustion engi ne
CA1323533C (en) * 1987-12-28 1993-10-26 Toshihiro Oikawa Valve operating system for internal combustion engines
DE19608651A1 (en) * 1996-03-06 1997-09-11 Schaeffler Waelzlager Kg Valve train for gas exchange valves of internal combustion engines
DE19728100B4 (en) 1997-07-02 2005-11-10 Ina-Schaeffler Kg Switchable plunger for a valve train of an internal combustion engine
DE19801701A1 (en) 1998-01-17 1999-07-22 Porsche Ag Valve gear of internal combustion engine
DE19801603A1 (en) * 1998-01-17 1999-07-22 Schaeffler Waelzlager Ohg Motor valve cam follower assembly
DE19913290A1 (en) 1999-03-24 2000-09-28 Schaeffler Waelzlager Ohg Switchable cam tracker for engine valve drive, with at least one web forms in sectors or completely of injectable foam material
US6321705B1 (en) * 1999-10-15 2001-11-27 Delphi Technologies, Inc. Roller finger follower for valve deactivation
DE10102130A1 (en) * 2001-01-18 2002-07-25 Ina Schaeffler Kg Switched cam follower, for the valves of an IC motor, has a blocking piston with a smooth and cylindrical outer mantle fitted with a separate ring limit stop bonded in place using standard components
DE10119366A1 (en) * 2001-04-20 2002-10-24 Ina Schaeffler Kg Hydraulic system for internal combustion engine has coupling, valve drive element, track, hole, ducts, hydraulic pump, connection

Also Published As

Publication number Publication date
US20050028776A1 (en) 2005-02-10
ATE388307T1 (en) 2008-03-15
AU2003235625A1 (en) 2003-07-30
DE50309312D1 (en) 2008-04-17
US7059287B2 (en) 2006-06-13
EP1466082A1 (en) 2004-10-13
DE10201805A1 (en) 2003-07-31
WO2003060294A1 (en) 2003-07-24

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