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WO2003067037A1 - Switching element for a valve gear of an internal combustion engine - Google Patents

Switching element for a valve gear of an internal combustion engine Download PDF

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Publication number
WO2003067037A1
WO2003067037A1 PCT/EP2002/014431 EP0214431W WO03067037A1 WO 2003067037 A1 WO2003067037 A1 WO 2003067037A1 EP 0214431 W EP0214431 W EP 0214431W WO 03067037 A1 WO03067037 A1 WO 03067037A1
Authority
WO
WIPO (PCT)
Prior art keywords
pistons
switching element
bore
inner element
receptacle
Prior art date
Application number
PCT/EP2002/014431
Other languages
German (de)
French (fr)
Inventor
Norbert Geyer
Peter Sailer
Oliver Schnell
Original Assignee
Ina-Schaeffler Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10204673A external-priority patent/DE10204673A1/en
Application filed by Ina-Schaeffler Kg filed Critical Ina-Schaeffler Kg
Priority to CA2479264A priority Critical patent/CA2479264C/en
Priority to AU2002358742A priority patent/AU2002358742A1/en
Publication of WO2003067037A1 publication Critical patent/WO2003067037A1/en
Priority to US10/900,615 priority patent/US20050005884A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • F01L13/0031—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 by modification of tappet or pushrod length
    • 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
    • F01L1/146—Push-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a switching element for a valve train of an internal combustion engine, preferably for valve shutdown, with an outer part and an inner element axially movable in its bore, the outer part and the inner element in an axially distant relative position achieved by a lost motion spring at least one relative to the other have aligned receptacle and in one of the receptacles movable coupling means for coupling the inner element to the outer part are applied in the relative position to each other.
  • Such a switching element here designed as a cam follower in a push rod drive, is previously known from DE 199 15 531. It is disadvantageous in this case that only a piston is provided as the coupling means. It is clear to the person skilled in the art that there is an increased component load in the coupling area due to the one-piston coupling. There is also a relatively high risk of tipping over of the inner element opposite the outer part. It is also disadvantageous that a bore is provided as the receptacle into which the piston enters as a coupling means. Due to the special penetration of the body, an extremely undesirable edge load can occur if the coupling agent is insufficiently extended.
  • the object of the invention is therefore to provide a switching element of the aforementioned type, in which the disadvantages cited are eliminated with simple means.
  • this object is achieved in that two pistons are provided as coupling means, which run in the receptacle of the inner element designed as a radial bore and are diametrically opposed there, the receptacle of the outer part being made as an annular groove in its bore and the pistons on their underside remote from the cam , starting from its radially outer end face, in sections have a flat transverse face as a contact area to a facing annular face of the annular groove, and the pistons are guided in the inner element via an anti-rotation device.
  • the pistons have a flat transverse surface on their underside as a contact area to the annular groove, so that the surface pressure is drastically reduced here.
  • the cam stroke can be very large load-bearing surfaces to transfer to the inner part.
  • more than two coupling means can also be arranged in the inner element, preferably these should then be distributed symmetrically.
  • the pistons are fixed with respect to their receptacle by a simple anti-rotation device.
  • the invention contemplates, for example, a snap ring surrounding the inner element, on which the transverse surface of the pistons rests in the receiving area.
  • the pistons themselves can also be secured against rotation by flats or tongue-and-groove configurations.
  • the radial bore in the inner element is preferably made as a through bore.
  • a stepped or staged training is also conceivable, so that the aforementioned snap ring or a similar means can be dispensed with.
  • the radially outer end face of the pistons at least in the edge region to the transverse surface, has a curvature correlating to the bore of the inner element. This means that even when the pistons are passed over the smallest amount in the annular groove of the outer part, a good carrying area is created.
  • a further particularly preferred embodiment of the invention relates to the fact that an end face of the pistons connecting the transverse surface to the underside has a curvature correlating with the bore of the inner element or is chamfered like a roof. It is therefore clear that these simple measures allow the pistons to extend radially very far into the ring groove in the coupling case and thus result in an excellent contact pattern.
  • the scope of this invention expressly relates to all types of switching elements in valve drives, such as cam followers in push rod drives, support elements for rocker arms, bucket tappets, etc.
  • FIG. 2 shows a partial longitudinal section according to FIG. 1 rotated by 90 °
  • FIG. 3 shows a partial longitudinal section similar to FIG. 2,
  • FIG. 4 shows a bottom view of a piston as coupling means
  • Figure 5 shows the piston in cross section
  • Figures 1-3 disclose a switching element 1 for a valve train of an internal combustion engine.
  • This is designed as a roller tappet for a tappet rod drive. It consists of an outer part 2, in the bore 3 of which an axially movable inner element 5 runs with its outer jacket 4.
  • the outer part 2 and the inner element 5 are urged away from one another by a lost motion spring 6, which is not to be explained in more detail.
  • the receptacles 7, 8 are aligned with one another.
  • the receptacle 7 of the outer part 2 is made as a circumferential annular groove.
  • the receptacle 8 in the inner element 5, on the other hand, is made as a radial through hole.
  • a bowstring-like or skewed course is also conceivable.
  • Two diametrically opposite coupling means 9 are arranged in the receptacle 8 of the inner element 5. These are designed here as pistons 10 and are urged away from one another by a pressure spring means 11. A stop 12 for the pistons 10 is created in the center of the receptacle 8. This is designed as a ring part like a snap ring. Thus, in a decoupling position, the piston 10 is always guaranteed its central position and thus the same travel.
  • the coupling opening in the outer part 2 is circumferential, which has advantages in terms of production technology, for example.
  • the end face 13 of the pistons 10, as shown in FIG. 4, can be curved, as can the bore 3 of the outer part 2.
  • a good contact pattern occurs immediately after the pistons 10 are inserted into the annular groove 16. So-called edge supports are effectively avoided.
  • FIG. 3 shows an alternative measure of the central stop 12 for the
  • Piston 10 This is designed here as a pin 21 projecting orthogonally into the receptacle 8 of the inner element 5 designed as a radial bore.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a switching element (1) for a valve gear of an internal combustion engine, preferably for shutting off valves. Said valve comprises an external part (2), in addition to an internal element (5) that can be axially displaced in the bore (3) of said external part, said external part (2) and internal element (5) having at least one respective recess (7, 8) that lie in alignment with and at an axial distance from one another in a relative position that is achieved by a lost motion spring (6). In one of the recesses, coupling means (9), which are used for coupling the internal element (5) to the external part (2) in said relative position and which can be displaced in the direction of the other recess, are allocated to one another. Two pistons (10) are provided as the coupling means (9), said pistons running in the recess (8) that is configured as a radial bore of the internal element (5) and lying diametrically opposite one another. The recess (7) of the external part (2) is configured as an annular groove (16) in the bore (3) of said part and sections of the underside (17) of the pistons (10), which faces away from the cams, have a flat transversal surface (14), originating from the radially external front face (13) of said underside and acting as a contact area for a facing annular surface (15) of the annular groove (16). The pistons (10) are guided in the internal element (5) by means of an anti-torsion mechanism (19). The invention provides a switching element (1) that comprises a simply constructed coupling mechanism, which creates negligible stress on the components.

Description

Bezeichnung der Erfindung Name of the invention
Schaltelement für einen Ventiltrieb einer BrennkraftmaschineSwitching element for a valve train of an internal combustion engine
Beschreibungdescription
Gebiet der ErfindungField of the Invention
Die Erfindung betrifft ein Schaltelement für einen Ventiltrieb einer Brennkraftmaschine, vorzugsweise zur Ventilabschaltung, mit einem Außenteil sowie einem in dessen Bohrung axial beweglichen Innenelement, wobei das Außenteil und das Innenelement in einer durch eine Lost-Motion-Feder erzielten axial entfernten Relativstellung wenigstens je eine zueinander fluchtende Aufnahme besitzen und in einer der Aufnahmen in Richtung zur anderen Aufnahme verschiebliche Koppelmittel zur Kopplung des Innenelements mit dem Außenteil bei der Relativstellung zueinander appliziert sind.The invention relates to a switching element for a valve train of an internal combustion engine, preferably for valve shutdown, with an outer part and an inner element axially movable in its bore, the outer part and the inner element in an axially distant relative position achieved by a lost motion spring at least one relative to the other have aligned receptacle and in one of the receptacles movable coupling means for coupling the inner element to the outer part are applied in the relative position to each other.
Hintergrund der ErfindungBackground of the Invention
Ein derartiges Schaltelement, hier als Nockenfolger in einem Stößelstangentrieb ausgebildet, ist aus der DE 199 15 531 vorbekannt. Nachteilig ist es bei diesem, dass als Koppelmittel lediglich ein Kolben vorgesehen ist. Dem Fachmann ist klar, dass aufgrund der Ein-Kolben-Kopplung eine erhöhte Bauteilbelastung im Koppelbereich vorliegt. Auch besteht eine relativ große Kippgefahr des Innenelements gegenüber dem Außenteil. Nachteilig ist es auch, dass als Aufnahme, in welche der Kolben als Koppelmittel einfährt, eine Bohrung vorgesehen ist. Hier kann es, aufgrund der speziellen Durchdringung der Körper, bei ungenügend ausgefahrenem Koppelmittel zu einer äußerst unerwünschten Kantenbelastung kommen.Such a switching element, here designed as a cam follower in a push rod drive, is previously known from DE 199 15 531. It is disadvantageous in this case that only a piston is provided as the coupling means. It is clear to the person skilled in the art that there is an increased component load in the coupling area due to the one-piston coupling. There is also a relatively high risk of tipping over of the inner element opposite the outer part. It is also disadvantageous that a bore is provided as the receptacle into which the piston enters as a coupling means. Due to the special penetration of the body, an extremely undesirable edge load can occur if the coupling agent is insufficiently extended.
Aufgabe der ErfindungObject of the invention
Aufgabe der Erfindung ist es daher, ein Schaltelement der vorgenannten Art zu schaffen, bei welchem die zitierten Nachteile mit einfachen Mitteln beseitigt sind.The object of the invention is therefore to provide a switching element of the aforementioned type, in which the disadvantages cited are eliminated with simple means.
Zusammenfassung der ErfindungSummary of the invention
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass als Koppelmittel zwei Kolben vorgesehen sind, welche in der als Radialbohrung ausgebildeten Aufnahme des Innenelements verlaufen und sich dort diametral gegenüberliegen, wobei die Aufnahme des Außenteils als Ringnut in dessen Bohrung gefertigt ist und die Kolben an ihrer nockenfernen Unterseite, ausgehend von ihrer radial äußeren Stirnfläche, abschnittsweise eine plane Querfläche als Kontaktbereich zu einer zugewandten Ringfläche der Ringnut aufweisen und wobei die Kolben über eine Verdrehsicherung im Innenelement geführt sind.According to the invention, this object is achieved in that two pistons are provided as coupling means, which run in the receptacle of the inner element designed as a radial bore and are diametrically opposed there, the receptacle of the outer part being made as an annular groove in its bore and the pistons on their underside remote from the cam , starting from its radially outer end face, in sections have a flat transverse face as a contact area to a facing annular face of the annular groove, and the pistons are guided in the inner element via an anti-rotation device.
Hierdurch ist ein Schaltelement mit einem sehr sicheren Koppelmechanismus geschaffen. Die Bauteilbelastung ist durch die Zwei-Kolben-Verriegelung drastisch reduziert, ebenfalls die Kippneigung. Zum anderen ist festzuhalten, dass aufgrund der als umlaufende Ringnut ausgebildeten Aufnahme im Außenteil eine einfach zu fertigende Koppelöffnung vorliegt. Die Kolben haben erfindungsgemäß an ihrer Unterseite eine plane Querfläche als Kontaktbereich zu der Ringnut, so dass hier die Flächenpressung drastisch reduziert ist. Mit anderen Worten gesagt gelingt es aufgrund der erfindungsgemäßen Maßnahmen, den Nockenhub über sehr große tragende Flächen auf das Innenteil zu übertragen. Gegebenenfalls können auch mehr als zwei Koppelmittel im Innenelement angeordnet werden, vorzugsweise sollen diese dann symmetrisch verteilt sein.This creates a switching element with a very secure coupling mechanism. The component load is drastically reduced by the two-piston lock, as is the tendency to tip over. On the other hand, it should be noted that due to the receptacle designed as a circumferential annular groove, there is an easy-to-manufacture coupling opening in the outer part. According to the invention, the pistons have a flat transverse surface on their underside as a contact area to the annular groove, so that the surface pressure is drastically reduced here. In other words, due to the measures according to the invention, the cam stroke can be very large load-bearing surfaces to transfer to the inner part. If necessary, more than two coupling means can also be arranged in the inner element, preferably these should then be distributed symmetrically.
Damit stets die plane Querfläche in Kontakt zu der Ringfläche der Ringnut ist, sind die Kolben über eine einfache Verdrehsicherung gegenüber ihrer Aufnahme fixiert. Hier ist in Konkretisierung der Erfindung beispielsweise an einen das Innenelement umschließenden Sprengring gedacht, auf welchem die Querfläche der Kolben im Aufnahmebereich aufliegt. Selbstverständlich können die Kolben auch selbst durch Anflachungen oder Feder-Nut-Ausgestaltungen in ihrer Aufnahme verdrehgesichert werden.So that the flat transverse surface is always in contact with the annular surface of the annular groove, the pistons are fixed with respect to their receptacle by a simple anti-rotation device. Here, in concrete terms, the invention contemplates, for example, a snap ring surrounding the inner element, on which the transverse surface of the pistons rests in the receiving area. Of course, the pistons themselves can also be secured against rotation by flats or tongue-and-groove configurations.
In Fortbildung der Erfindung ist es vorgeschlagen, im Innenelement einen Anschlag für die Kolben vorzusehen. Dieser ist mittig angeordnet, so dass beide Kol- ben stets einen gleichen Verfahrweg radial nach außen besitzen.In a development of the invention, it is proposed to provide a stop for the pistons in the inner element. This is arranged in the center, so that both pistons always have the same travel radially outwards.
Vorzugsweise ist die Radialbohrung im Innenelement als Durchgangsbohrung gefertigt. Denkbar ist jedoch auch eine abgesetzte bzw. gestufte Ausbildung, so dass auf den vorgenannten Sprengring oder ein ähnliches Mittel verzichtet werden kann.The radial bore in the inner element is preferably made as a through bore. However, a stepped or staged training is also conceivable, so that the aforementioned snap ring or a similar means can be dispensed with.
Besonders vorteilhaft ist es, wenn die radial äußere Stirnfläche der Kolben, zumindest im Kantenbereich zur Querfläche, eine zu der Bohrung des Innenelements korrelierende Krümmung aufweist. Somit ist auch schon beim geringsten Überfah- ren der Kolben in die Ringnut des Außenteils ein guter Tragebereich geschaffen.It is particularly advantageous if the radially outer end face of the pistons, at least in the edge region to the transverse surface, has a curvature correlating to the bore of the inner element. This means that even when the pistons are passed over the smallest amount in the annular groove of the outer part, a good carrying area is created.
Eine weitere besonders bevorzugte Ausgestaltung der Erfindung bezieht sich darauf, dass eine die Querfläche mit der Unterseite verbindende Stirnseite der Kolben eine zu der Bohrung des Innenelements korrelierende Krümmung hat bzw. dach- artig abgeschrägt ist. Somit ist klar, dass über diese einfachen Maßnahmen die Kolben radial sehr weit in die Ringnut im Koppelfall ausfahren können und sich somit ein hervorragendes Tragbild ergibt. Der Schutzbereich dieser Erfindung bezieht sich ausdrücklich auf alle Arten von Schaltelementen in Ventiltrieben wie Nockenfolger in Stößelstangentrieben, Abstützelemente für Schlepphebel, Tassenstößel etc.A further particularly preferred embodiment of the invention relates to the fact that an end face of the pistons connecting the transverse surface to the underside has a curvature correlating with the bore of the inner element or is chamfered like a roof. It is therefore clear that these simple measures allow the pistons to extend radially very far into the ring groove in the coupling case and thus result in an excellent contact pattern. The scope of this invention expressly relates to all types of switching elements in valve drives, such as cam followers in push rod drives, support elements for rocker arms, bucket tappets, etc.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Die Erfindung ist zweckmäßigerweise anhand der Zeichnung näher erläutert. Es zeigen:The invention is expediently explained in more detail with reference to the drawing. Show it:
Figur 1 einen Längsschnitt durch ein als Rollenstößel ausgebildetes1 shows a longitudinal section through a roller tappet
Schaltelement,Switching element
Figur 2 einen um 90° gedrehten Teillängsschnitt nach Figur 1 ,FIG. 2 shows a partial longitudinal section according to FIG. 1 rotated by 90 °,
Figur 3 einen ähnlichen Teillängsschnitt wie Figur 2,FIG. 3 shows a partial longitudinal section similar to FIG. 2,
Figur 4 eine Unteransicht auf einen Kolben als Koppelmittel,FIG. 4 shows a bottom view of a piston as coupling means,
Figur 5 den Kolben im Querschnitt undFigure 5 shows the piston in cross section and
Figuren 6, 7 alternative Ausgestaltungen zu denen nach Figur 4 und 5.6, 7 alternative configurations to those according to FIGS. 4 and 5.
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Die Figuren 1-3 offenbaren ein Schaltelement 1 für einen Ventiltrieb einer Brennkraftmaschine. Dieses ist hier als Rollenstößel für einen Stößelstangentrieb ausgebildet. Es besteht aus einem Außenteil 2, in dessen Bohrung 3 mit seinem Außenmantel 4 ein axial bewegliches Innenelement 5 verläuft. Das Außenteil 2 und das Innenelement 5 sind durch eine nicht näher zu erläuternde Lost-Motion-Feder 6 voneinander weg beaufschlagt. In der zeichnerisch dargestellten axial voneinander entfernten Position des Außenteils 2 zum Innenelement 5 fluchten deren Aufnahmen 7, 8 zueinander. Die Aufnahme 7 des Außenteils 2 ist als umlaufende Ringnut gefertigt. Die Aufnahme 8 im Innenelement 5 hingegen ist als radial verlaufende Durch- gangsbohrung gefertigt. Ein bogensehnenartiger bzw. windschiefer Verlauf ist ebenfalls denkbar.Figures 1-3 disclose a switching element 1 for a valve train of an internal combustion engine. This is designed as a roller tappet for a tappet rod drive. It consists of an outer part 2, in the bore 3 of which an axially movable inner element 5 runs with its outer jacket 4. The outer part 2 and the inner element 5 are urged away from one another by a lost motion spring 6, which is not to be explained in more detail. In the illustrated position of the outer part 2 axially distant from the inner element 5, the receptacles 7, 8 are aligned with one another. The receptacle 7 of the outer part 2 is made as a circumferential annular groove. The receptacle 8 in the inner element 5, on the other hand, is made as a radial through hole. A bowstring-like or skewed course is also conceivable.
In der Aufnahme 8 des Innenelements 5 sind zwei sich diametral gegenüberliegende Koppelmittel 9 angeordnet. Diese sind hier als Kolben 10 ausgebildet und durch ein Druckfedermittel 11 voneinander weg beaufschlagt. Mittig in der Aufnahme 8 ist ein Anschlag 12 für die Kolben 10 geschaffen. Dieser ist als Ringteil wie ein Sprengring ausgebildet. Somit ist in einer Entkoppelposition der Kolben 10 stets deren mittige Lage und somit gleicher Verfahrweg garantiert.Two diametrically opposite coupling means 9 are arranged in the receptacle 8 of the inner element 5. These are designed here as pistons 10 and are urged away from one another by a pressure spring means 11. A stop 12 for the pistons 10 is created in the center of the receptacle 8. This is designed as a ring part like a snap ring. Thus, in a decoupling position, the piston 10 is always guaranteed its central position and thus the same travel.
Die Kolben 10 haben, wie näher aus den Figuren 4-7 hervorgeht, ausgehend von ihrer radial äußeren Stimfläche13, abschnittsweise eine plane Querfläche 14. Diese dient als Kontaktbereich zu einer zugewandten Ringfläche 15 (siehe Figuren 1-3) der als Ringnut 16 ausgebildeten Aufnahme 7. Wie ersichtlich, ist die Koppelöffnung im Außenteil 2 umlaufend ausgebildet, was beispielsweise fertigungstechnische Vorteile hat.The pistons 10, as can be seen in more detail in FIGS. 4-7, have a flat transverse surface 14 in sections, starting from their radially outer end surface 13. This serves as a contact area to a facing annular surface 15 (see FIGS. 1-3) of the receptacle designed as an annular groove 16 7. As can be seen, the coupling opening in the outer part 2 is circumferential, which has advantages in terms of production technology, for example.
Die Stirnfläche 13 der Kolben 10 kann, wie in Figur 4 gezeigt, ebenso wie die Bohrung 3 des Außenteils 2 gekrümmt sein. Somit kommt es sofort nach Ein- fahren der Kolben 10 in die Ringnut 16 zu einem guten Tragbild. Sogenannte Kantenträger werden wirksam vermieden.The end face 13 of the pistons 10, as shown in FIG. 4, can be curved, as can the bore 3 of the outer part 2. Thus, a good contact pattern occurs immediately after the pistons 10 are inserted into the annular groove 16. So-called edge supports are effectively avoided.
Auch ist es vorgesehen, wie aus den Figuren 4, 6 ersichtlich, eine die Querflä- che 14 mit einer nockenfernen Unterseite 17 verbindende Stirnseite 18 der Kolben 10 ebenfalls mit einer zu der Bohrung 3 des Außenteils 2 korrelieren- den Krümmung zu versehen bzw. wie in Figur 6 gezeigt, dachartig abzuschrägen. Da die Querflächen 14 der Kolben 10 stets der Ringfläche 15 der Ringnut 16 im Außenteil 2 zugewandt sein müssen, ist eine einfache Verdrehsicherung 19 für die Kolben 10 vorgesehen (s. Fig. 2). Diese besteht aus einem Ringteil wie einem Sprengring, welcher in einer Ringnut 20 am Außenmantel 4 des In- nenelements 5 angeordnet ist. Dabei verläuft die Verdrehsicherung 19 auf einer derartigen Höhe, dass sie die Querfläche 14 der Kolben 10 untergreift.It is also provided, as can be seen from FIGS. 4 and 6, to provide an end face 18 of the pistons 10 connecting the transverse surface 14 with a bottom 17 remote from the cam, likewise with a curvature correlating with the bore 3 of the outer part 2 or as shown in Figure 6, bevel like roof. Since the transverse surfaces 14 of the pistons 10 must always face the annular surface 15 of the annular groove 16 in the outer part 2, a simple anti-rotation device 19 is provided for the pistons 10 (see FIG. 2). This consists of an annular part such as a snap ring, which is arranged in an annular groove 20 on the outer jacket 4 of the inner element 5. The anti-rotation device 19 extends at a height such that it engages under the transverse surface 14 of the pistons 10.
Figur 3 zeigt eine alternative Maßnahme des mittigen Anschlags 12 für dieFigure 3 shows an alternative measure of the central stop 12 for the
Kolben 10. Dieser ist hier als orthogonal in die als Radialbohrung ausgebildete Aufnahme 8 des Innenelements 5 ragendes Bauteil 21 wie ein Stift ausgebildet.Piston 10. This is designed here as a pin 21 projecting orthogonally into the receptacle 8 of the inner element 5 designed as a radial bore.
Somit liegt ein Schaltelement 1 vor, welches einen sehr sicheren und einfach aufgebauten Koppelmechanismus besitzt, der nur eine geringe Bauteilbelastung erzeugt. Thus there is a switching element 1, which has a very safe and simply constructed coupling mechanism, which generates only a small component load.
Liste der BezugszahlenList of reference numbers
Schaltelementswitching element
Außenteilouter part
Bohrungdrilling
Außenmantelouter sheath
Innenelementinner element
Lost-Motion-FederLost-motion spring
Aufnahmeadmission
Aufnahmeadmission
Koppelmittelcoupling means
Kolbenpiston
DruckfedermittelSpring means
Anschlagattack
Stirnflächeface
Querflächetransverse surface
Ringflächering surface
Ringnutring groove
Unterseitebottom
Stirnseitefront
Verdrehsicherungtwist
Ringteilring part
Bauteilcomponent
Kantenbereich edge region

Claims

Patentansprüche claims
1. Schaltelement (1 ) für einen Ventiltrieb einer Brennkraftmaschine, vorzugsweise zur Ventilabschaltung, mit einem Außenteil (2) sowie einem in dessen Bohrung1. Switching element (1) for a valve train of an internal combustion engine, preferably for valve shutdown, with an outer part (2) and one in its bore
(3) axial beweglichen Innenelement (5), wobei das Außenteil (2) und das Innenelement (5) in einer durch eine Lost-Motion-Feder (6) erzielten axial entfernten Relativstellung wenigstens je eine zueinander fluchtende Aufnahme (7, 8) besitzen und in einer der Aufnahmen in Richtung zur anderen Aufnahme verschiebliche Koppelmittel (9) zur Kopplung des Innenelements (5) mit dem(3) axially movable inner element (5), the outer part (2) and the inner element (5) in an axially distant relative position achieved by a lost motion spring (6) each having at least one receptacle (7, 8) aligned with one another and coupling means (9) displaceable in one of the receptacles in the direction of the other receptacle for coupling the inner element (5) to the
Außenteil (2) bei der Relativstellung zueinander appliziert sind, dadurch gekennzeichnet, daß als Koppelmittel (9) zwei Kolben (10) vorgesehen sind, welche in der als Radialbohrung ausgebildeten Aufnahme (8) des Innenelements (5) verlaufen und sich dort diametral gegenüberliegen, wobei die Auf- nähme (7) des Außenteils (2) als Ringnut (16) in dessen Bohrung (3) gefertigt ist und die Kolben (10) an ihrer nockenfernen Unterseite (17), ausgehend von ihrer radial äußeren Stirnfläche (13), abschnittsweise eine plane Querfläche (14) als Kontaktbereich zu einer zugewandten Ringfläche (15) der Ringnut (16) aufweisen und wobei die Kolben (10) über eine Verdrehsicherung (19) im In- nenelement (5) geführt sind.The outer part (2) is applied in the relative position to one another, characterized in that two pistons (10) are provided as coupling means (9), which run in the receptacle (8) of the inner element (5) and are diametrically opposed there, the receptacle (7) of the outer part (2) being produced as an annular groove (16) in its bore (3) and the pistons (10) on their underside (17) remote from the cam, starting from their radially outer end face (13), Sections have a flat transverse surface (14) as a contact area to a facing annular surface (15) of the annular groove (16) and the pistons (10) are guided in the inner element (5) via an anti-rotation device (19).
2. Schaltelement nach Anspruch 1 , dadurch gekennzeichnet, daß die Verdrehsicherung (19) über ein Ringteil wie einen Sprengring realisiert ist, wel- eher in einer Ringnut (20) an einem Außenmantel (4) des Innenelements (5) verläuft und auf einer derartigen Höhe angeordnet ist, daß er die plane Querfläche (14) der Kolben (10) untergreift.2. Switching element according to claim 1, characterized in that the anti-rotation device (19) is realized via a ring part such as a snap ring, which rather runs in an annular groove (20) on an outer casing (4) of the inner element (5) and on such Height is arranged so that it engages under the flat transverse surface (14) of the pistons (10).
3. Schaltelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Aufnahme (8) im Innenelement (5) einen Anschlag (12) für radial innere Stirnflächen der Kolben (10) hat, welcher Anschlag (12) mittig positioniert ist. 3. Switching element according to claim 1 or 2, characterized in that the receptacle (8) in the inner element (5) has a stop (12) for radially inner end faces of the pistons (10), which stop (12) is positioned centrally.
4. Schaltelement nach Anspruch 3, dadurch gekennzeichnet, daß die Aufnahme (8) als Durchgangsbohrung ausgebildet ist, wobei als Anschlag (12) entweder ein Ringteil wie ein Sprengring vorgesehen ist, welcher in der4. Switching element according to claim 3, characterized in that the receptacle (8) is designed as a through hole, wherein as a stop (12) either an annular part such as a snap ring is provided, which in the
Durchgangsbohrung gehalten ist, oder ein orthogonal in die Durchgangsbohrung ragendes Bauteil (21 ) wie ein Stift verwendet ist.Through bore is held, or a component (21) projecting orthogonally into the through bore is used, such as a pin.
5. Schaltelement nach Anspruch 1 , dadurch gekennzeichnet, daß die radial äußere Stirnfläche (13) der Kolben (10), zumindest im Kantenbereich (22) zur Querfläche (14), eine zu der Bohrung (3) des Innenelements (5) korrelierende Krümmung hat.5. Switching element according to claim 1, characterized in that the radially outer end face (13) of the piston (10), at least in the edge region (22) to the transverse surface (14), a correlation to the bore (3) of the inner element (5) Has.
6. Schaltelement nach Anspruch 1 oder 5, dadurch gekennzeichnet, daß eine die Querfläche (14) mit der Unterseite (17) verbindende Stirnseite (18) der Kolben (10) eine zu der Bohrung (3) des Innenelements (5) korrelierende Krümmung hat bzw. dachartig abgeschrägt in Unteransicht ausgebildet ist.6. Switching element according to claim 1 or 5, characterized in that one of the transverse surface (14) with the underside (17) connecting end face (18) of the piston (10) has a correlation to the bore (3) of the inner element (5) or roof-like sloping in bottom view.
7. Schaltelement nach Anspruch 1, dadurch gekennzeichnet, daß das Schaltelement (1) als Nockenfolger in einem Stößelstangentrieb hergestellt ist. 7. Switching element according to claim 1, characterized in that the switching element (1) is made as a cam follower in a push rod drive.
PCT/EP2002/014431 2002-02-06 2002-12-18 Switching element for a valve gear of an internal combustion engine WO2003067037A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2479264A CA2479264C (en) 2002-02-06 2002-12-18 Switching element for a valve drive of an internal combustion engine
AU2002358742A AU2002358742A1 (en) 2002-02-06 2002-12-18 Switching element for a valve gear of an internal combustion engine
US10/900,615 US20050005884A1 (en) 2002-02-06 2004-07-28 Switching element for a valve drive of an internal combustion engine

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US35463002P 2002-02-06 2002-02-06
US60/354,630 2002-02-06
DE10204673.5 2002-02-06
DE10204673A DE10204673A1 (en) 2002-02-06 2002-02-06 Automotive drive switching element comprises diametrically opposed piston pair in groove mountings on inner and outer parts to run nontwistably in grooves.

Related Child Applications (1)

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US10/900,615 Continuation US20050005884A1 (en) 2002-02-06 2004-07-28 Switching element for a valve drive of an internal combustion engine

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CA (1) CA2479264C (en)
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WO2008122477A1 (en) * 2007-04-05 2008-10-16 Schaeffler Kg Switchable valve train part

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Publication number Priority date Publication date Assignee Title
DE19915531A1 (en) 1999-04-07 2000-10-12 Schaeffler Waelzlager Ohg Cam tracker for valve drive of internal combustion engine, with locking element such as piston fixed in inner element receiver
EP1149989A1 (en) * 2000-03-23 2001-10-31 Eaton Corporation Hydraulically actuated latching pin valve deactivation
US20020014217A1 (en) * 1999-02-23 2002-02-07 Church Kynan L. Hydraulically actuated latching pin valve deactivation
US20020046718A1 (en) * 2000-10-20 2002-04-25 Spath Mark J. Deactivation roller hydraulic valve lifter

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Publication number Priority date Publication date Assignee Title
US20020014217A1 (en) * 1999-02-23 2002-02-07 Church Kynan L. Hydraulically actuated latching pin valve deactivation
DE19915531A1 (en) 1999-04-07 2000-10-12 Schaeffler Waelzlager Ohg Cam tracker for valve drive of internal combustion engine, with locking element such as piston fixed in inner element receiver
EP1149989A1 (en) * 2000-03-23 2001-10-31 Eaton Corporation Hydraulically actuated latching pin valve deactivation
US20020046718A1 (en) * 2000-10-20 2002-04-25 Spath Mark J. Deactivation roller hydraulic valve lifter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008122477A1 (en) * 2007-04-05 2008-10-16 Schaeffler Kg Switchable valve train part
KR101465280B1 (en) 2007-04-05 2014-11-26 섀플러 홀딩 게엠베하 운트 코. 카게 Switchable valve train part

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CA2479264A1 (en) 2003-08-14
CA2479264C (en) 2010-06-29
AU2002358742A1 (en) 2003-09-02

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