EP1260681B1 - Valve tappet - Google Patents

Valve tappet Download PDF

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Publication number
EP1260681B1
EP1260681B1 EP02009906A EP02009906A EP1260681B1 EP 1260681 B1 EP1260681 B1 EP 1260681B1 EP 02009906 A EP02009906 A EP 02009906A EP 02009906 A EP02009906 A EP 02009906A EP 1260681 B1 EP1260681 B1 EP 1260681B1
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EP
European Patent Office
Prior art keywords
bottom part
cam
tappet
inner bottom
cams
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02009906A
Other languages
German (de)
French (fr)
Other versions
EP1260681A3 (en
EP1260681A2 (en
Inventor
Michael Haas
Dieter Schmidt
Walter Speil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHO Holding GmbH and Co KG
Original Assignee
INA Schaeffler KG
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Filing date
Publication date
Application filed by INA Schaeffler KG filed Critical INA Schaeffler KG
Publication of EP1260681A2 publication Critical patent/EP1260681A2/en
Publication of EP1260681A3 publication Critical patent/EP1260681A3/en
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Publication of EP1260681B1 publication Critical patent/EP1260681B1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—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
    • 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 present invention relates in particular to a tappet for a valve train an internal combustion engine.
  • the present invention relates in particular switchable tappets, as used in valve drives for the purpose of cylinder, Valve or stroke switching or combinations thereof can be used.
  • EP 0 857 860 A1 describes a tappet for a valve train according to the features the preamble of claim 1 known.
  • the disadvantage here is that the rectangular recess in the outer bottom part to accommodate the inner bottom part only with increased manufacturing effort can be formed.
  • the rectangular recess holes are provided on the narrow sides to prevent stress cracks avoid.
  • the task is therefore to simplify the manufacture of the plunger.
  • the circular recess in the outer bottom part can be manufactured easy and precise manufacture. Additional holes to avoid There are no tension cracks.
  • the interaction of the circular recess with the circumferential arc sections of the inner bottom part allows given the diameter of the recess, the greatest possible extent of the inner bottom part for optimal emigration of the inner Cam.
  • the cam contact surface for the outer cams protrudes somewhat into the circular one Recess into it, however, the one for the loading by the External cam provided annular surface of the outer bottom part is sufficiently large, as explained in more detail below.
  • the inner part is rotatably received in the outer part.
  • the rectangular recess must be exactly aligned to other torsion-proof surfaces in order to There is no need to exclude tilting or jamming of the inner part this exact alignment in the tappet according to the invention because of rotationally symmetrical circular recess.
  • the inner base part can be clearly in its Diameters are increased to a correspondingly increased emigration to allow the cam contact line on the inner bottom part. Emigration also remains due to the flattening provided according to the invention the cam contact line on the outer bottom part. On in this way, on the one hand, there are large cam lifts by means of the external cams An enlarged cam stroke by means of the inner cam is also possible possible.
  • the inner base part can have a circular outer contour in a known manner have, but then with the opposing flats is provided. These flattenings can be done in a simple way Key surfaces be formed.
  • Another advantage of the invention is that a reduction in Cam width of the outer cams is not required, which disadvantageously increases Hertzian pressures with maximum emigration of the cam contact would lead.
  • a ratio of the outer diameter of the inner bottom part to the outer diameter of the outer bottom part between 0.4 and 0.7, but preferably between 0.5 and 0.6 possible.
  • this quotient shows the advantages of the tappet according to the invention clear: on the one hand, there is an undesirable increase in the mass of the ram overall avoided. On the other hand, significantly larger internal strokes can be carried out without restricting the outside stroke. Furthermore, the Hertzian pressures with maximum emigration not or only insignificantly elevated.
  • an outer part can be the outer bottom part and an inner part have the inner bottom part, in a known manner a locking device for releasably locking the outer part with the inner part is provided.
  • a locking device is, for example, from known from DE 196 52 180 A1.
  • the inner part and outer part are unlocked.
  • the two outer cams can the cam stroke of the entire tappet Taxes.
  • a particularly space-saving tappet according to the invention provides that the Locking device comprises a locking pin or locking piston that runs along an axis is displaceable, which is arranged parallel to the flats. If this tappet according to the invention is arranged in the valve train, it is accordingly the locking pin or the locking piston transverse to the axis of rotation of the camshafts arranged.
  • the tappet according to the invention has a base 1, which consists of an annular outer bottom part 2 and a circular inner bottom part 3 is formed.
  • the inner circular bottom part 3 is coaxial in the annular outer bottom part 2 arranged.
  • the two bottom parts 2, 3 are slidable relative to each other, the outer bottom part 2 of two not outer cam shown and wherein the inner bottom part 3 of an between the outer cam arranged - also not shown - inner cam is acted upon.
  • the inner bottom part 3 has on its circumference two opposite key surface 4. These key areas 4 serve to exempt the outer cams, not shown. dashed the cam contact surface 5 is shown on the outer base part 2 and the cam contact surface 6 on the inner bottom part 3.
  • the ratio of the diameter D i of the inner bottom part 3 to the outer diameter D a of the outer bottom part 2 is dimensioned such that a quotient is set which is between 0.5 and 0.6. With this diameter ratio, an optimal migration of the cam contact line on the inner base part is guaranteed. On the other hand, it is ensured that the width of the outer cam is not reduced despite the increased stroke on the inner base part 3.
  • the locking device 9 includes u. a. a locking piston 10 along an axis is displaceable, which is arranged parallel to the key surfaces 4.
  • the inner part 7 acts via a play compensation element (not explained in more detail) 11 together with at least one gas exchange valve of the internal combustion engine.
  • the outer part 8 works against a so-called lost motion spring 12.
  • the inner part 7 is in a circular recess 15 or bore of the Outer part 8 taken up against rotation. Between the two key surfaces 4 of the inner bottom part 3 extend on the circumference of circular arc sections 13, which is coaxial with the circular recess 15 and with little radial play to the boundary of the circular recess 15 Inner wall 14 of the outer bottom part 2 are arranged. This training of the inner bottom part enables a large extension of the cam contact area 6 for a large emigration of the inner cam.
  • the outer part 8 of the plunger has two diametrically opposite one another Place the outer base part 2 on base 17.
  • the locking piston 10 is slidably received in base holes 18. These bases are advantageous if the locking plunger is not further below the plunger surface due to installation can be arranged.
  • the cam contact surfaces 5, 6 of the bottom parts 2, 3 in a plane of curvature parallel to the camshaft is convexly curved.
  • the cam contact surfaces are parallel to the camshaft axis in the viewing direction 5, 6 convexly curved.

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To improve a tappet of such a type that an outer side part 8 and an inner part 7 are relatively slidable in the tappet operation direction and that a bottom part 2 of the outer part can be loaded by two outer cams and that a bottom part 3 of the inner part can be loaded by an inner cam arranged between the two outer cams and that the bottom part 3 of the inner part provided with a circular contour shape includes a flat parts 4 faced to an opposite side each other for releasing the outer cam at an outer circumference part thereof and that an arc section is formed on an outer circumference part of the bottom part 3 of the inner part between the flat parts 4, for simplifying manufacturing thereof. SOLUTION: An inside wall part 14 of the bottom part 2 of the outer part 8 forms a circular notch 15 crossing a cam contact line of the outer cam. The bottom part 3 of the inner part 7 is arranged in the notch 15. The arc section 13 provided on the outer circumference part side of the bottom part 3 of the inner part 7 is arranged in a position coaxial to the inside wall part 14 with maintaining small space in the radius direction to the inside wall part 14.

Description

Die vorliegende Erfindung betrifft einen Stößel für einen Ventiltrieb insbesondere einer Verbrennungskraftmaschine. Die vorliegende Erfindung betrifft insbesondere schaltbare Stößel, wie sie in Ventiltrieben zum Zwecke der Zylinder-, Ventil- oder Hubumschaltung oder Kombinationen davon eingesetzt werden.The present invention relates in particular to a tappet for a valve train an internal combustion engine. The present invention relates in particular switchable tappets, as used in valve drives for the purpose of cylinder, Valve or stroke switching or combinations thereof can be used.

Aus EP 0 857 860 A1 ist ein Stößel für einen Ventiltrieb gemäß den Merkmalen des Oberbegriffs des Anspruchs 1 bekannt.EP 0 857 860 A1 describes a tappet for a valve train according to the features the preamble of claim 1 known.

Nachteilig ist hier, dass die rechteckförmige Ausnehmung im äußeren Bodenteil zur Aufnahme des inneren Bodenteils nur unter erhöhtem Fertigungsaufwand gebildet werden kann. Zusätzlich zu der rechteckförmigen Ausnehmung sind an dessen Schmalseiten Bohrungen vorgesehen, um Spannungsrisse zu vermeiden.The disadvantage here is that the rectangular recess in the outer bottom part to accommodate the inner bottom part only with increased manufacturing effort can be formed. In addition to the rectangular recess holes are provided on the narrow sides to prevent stress cracks avoid.

Aufgabe ist es daher, die Herstellung des Stößels zu vereinfachen.The task is therefore to simplify the manufacture of the plunger.

Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.According to the invention, this object is achieved by the characterizing features of claim 1 solved.

Die kreisförmige Ausnehmung im äußeren Bodenteil läßt sich fertigungstechnisch leicht und präzise herstellen. Zusätzliche Bohrungen zur Vermeidung von Spannrissen entfallen. Das Zusammenspiel der kreisförmigen Ausnehmung mit den umfangsseitigen Kreisbogenabschnitten des inneren Bodenteils ermöglicht bei gegebenem Durchmesser der Ausnehmung eine größtmögliche Erstrekkung des inneren Bodenteils für eine optimale Auswanderung des inneren Nockens.The circular recess in the outer bottom part can be manufactured easy and precise manufacture. Additional holes to avoid There are no tension cracks. The interaction of the circular recess with the circumferential arc sections of the inner bottom part allows given the diameter of the recess, the greatest possible extent of the inner bottom part for optimal emigration of the inner Cam.

Die Nockenaufstandsfläche für die äußeren Nocken ragt etwas in die kreisförmige Ausnehmung hinein, wobei jedoch die für die Beaufschlagung durch die Außennocken vorgesehene kreisringförmige Fläche des äußeren Bodenteils hinreichend groß ist, wie weiter unten näher erläutert ist. Ebenso wie bei dem bekannten Stößel ist das Innenteil verdrehfest in dem Außenteil aufgenommen. Während jedoch bei dem bekannten Stößel die rechteckförmige Ausnehmung exakt zu anderen verdrehungssichemden Flächen ausgerichtet sein muss, um ein Verkanten oder Klemmen des Innenteils einwandfrei auszuschließen, entfällt diese exakte Ausrichtung bei dem erfindungsgemäßen Stößel wegen der rotationssymmetrischen kreisförmigen Ausnehmung.The cam contact surface for the outer cams protrudes somewhat into the circular one Recess into it, however, the one for the loading by the External cam provided annular surface of the outer bottom part is sufficiently large, as explained in more detail below. Just like that known plunger, the inner part is rotatably received in the outer part. However, while in the known plunger the rectangular recess must be exactly aligned to other torsion-proof surfaces in order to There is no need to exclude tilting or jamming of the inner part this exact alignment in the tappet according to the invention because of rotationally symmetrical circular recess.

Bei dem erfindungsgemäßen Stößel kann das innere Bodenteil deutlich in seinem Durchmesser vergrößert werden, um eine entsprechend vergrößerte Auswanderung der Nockenkontaktlinie auf dem inneren Bodenteil zu ermöglichen. Durch die erfindungsgemäß vorgesehenen Abflachungen bleibt auch die Auswanderung der Nockenkontaktlinie auf dem äußeren Bodenteil erhalten. Auf diese Weise sind also zum einen große Nockenhübe mittels der Außennocken möglich und weiter ist ein vergrößerter Nockenhub mittels des Innennockens möglich.In the tappet according to the invention, the inner base part can be clearly in its Diameters are increased to a correspondingly increased emigration to allow the cam contact line on the inner bottom part. Emigration also remains due to the flattening provided according to the invention the cam contact line on the outer bottom part. On in this way, on the one hand, there are large cam lifts by means of the external cams An enlarged cam stroke by means of the inner cam is also possible possible.

Bei dem erfindungsgemäßen Stößel wird erreicht, dass bei Grundkreisstellung die Außennocken in den durch die Abflachungen bedingten Aussparungen der Schlüsselflächen stehen. Mit möglicher Verbreiterung der Außennocken in Richtung symmetrieachsenfemer Lage des Schaltstößels kann die Hertz'sche Pressung im Nocken-Tassenkontakt ggf. reduziert werden. Hauptsächlich wird ein Freigang geschaffen, so dass bei Differenzhub das Außennockenpaar nicht mit dem Innengehäuse kollidiert.With the tappet according to the invention it is achieved that with the base circle the outer cams in the recesses of the Key faces are available. With possible widening of the outer cams in Hertz'sche can move in the direction of the position of the switching plunger, Pressure in the cam-cup contact may be reduced. Mostly will a clearance is created so that the pair of outer cams is not at differential stroke collided with the inner case.

Das innere Bodenteil kann in bekannter Weise eine kreisförmige Außenkontur aufweisen, die dann allerdings mit den einander gegenüberliegenden Abflachungen versehen ist. Diese Abflachungen können in einfacher Weise wie Schlüsselflächen ausgebildet sein.The inner base part can have a circular outer contour in a known manner have, but then with the opposing flats is provided. These flattenings can be done in a simple way Key surfaces be formed.

Ein weiterer Vorteil der Erfindung besteht darin, dass eine Reduzierung der Nockenbreite der Außennocken nicht erforderlich ist, was nachteilig zu erhöhten Hertz'schen Pressungen bei maximaler Auswanderung des Nockenkontakts führen würde.Another advantage of the invention is that a reduction in Cam width of the outer cams is not required, which disadvantageously increases Hertzian pressures with maximum emigration of the cam contact would lead.

Bei Differenzhubbetrieb des Stößels tauchen die beiden Außennocken - deren Drehachse quer zu den Abflachungen ausgerichtet sind - an dem inneren Bodenteil entlang dessen Abflachungen vorbei.During differential stroke operation of the ram, the two outer cams plunge Axis of rotation aligned transversely to the flats - on the inner bottom part past its flats.

Mit dem erfindungsgemäßen Stößel wird ein Verhältnis des Außendurchmessers des inneren Bodenteils zum Außendurchmesser des äußeren Bodenteils zwischen 0,4 und 0,7, vorzugsweise jedoch zwischen 0,5 und 0,6 möglich. Bei diesem Quotienten zeigen sich die Vorteile des erfindungsgemäßen Stößels deutlich: Zum einen ist eine unerwünschte Massenzunahme des Stößels insgesamt vermieden. Zum anderen können deutlich vergrößerte Innenhübe gefahren werden, ohne den Außenhub einzuschränken. Des Weiteren sind die Hertz'schen Pressungen bei maximaler Auswanderung nicht oder nur unwesentlich erhöht.With the tappet according to the invention, a ratio of the outer diameter of the inner bottom part to the outer diameter of the outer bottom part between 0.4 and 0.7, but preferably between 0.5 and 0.6 possible. at this quotient shows the advantages of the tappet according to the invention clear: on the one hand, there is an undesirable increase in the mass of the ram overall avoided. On the other hand, significantly larger internal strokes can be carried out without restricting the outside stroke. Furthermore, the Hertzian pressures with maximum emigration not or only insignificantly elevated.

Bei dem erfindungsgemäßen Stößel kann ein Außenteil das äußere Bodenteil und ein Innenteil das innere Bodenteil aufweisen, wobei in bekannter Weise eine Arretiereinrichtung zum lösbaren Arretieren des Außenteils mit dem Innenteil vorgesehen ist. Eine derartige Arretiereinrichtung ist beispielsweise aus der DE 196 52 180 A1 bekannt. Im Differenzhubbetrieb sind Innenteil und Außenteil entriegelt. Wenn das Innenteil und das Außenteil miteinander verriegelt sind, können die beiden Außennocken den Nockenhub des gesamten Stößels steuern.In the tappet according to the invention, an outer part can be the outer bottom part and an inner part have the inner bottom part, in a known manner a locking device for releasably locking the outer part with the inner part is provided. Such a locking device is, for example, from known from DE 196 52 180 A1. In the differential stroke mode, the inner part and outer part are unlocked. When the inner part and the outer part lock together are, the two outer cams can the cam stroke of the entire tappet Taxes.

Ein besonders platzsparender erfindungsgemäßer Stößel sieht vor, dass die Arretiereinrichtung einen Arretierstift oder Arretierkolben umfasst, der entlang einer Achse verschiebbar ist, die parallel zu den Abflachungen angeordnet ist. Wenn dieser erfindungsgemäße Stößel im Ventiltrieb angeordnet ist, ist demzufolge der Arretierstift bzw. der Arretierkolben quer zur Drehachse der Nokkenwellen angeordnet.A particularly space-saving tappet according to the invention provides that the Locking device comprises a locking pin or locking piston that runs along an axis is displaceable, which is arranged parallel to the flats. If this tappet according to the invention is arranged in the valve train, it is accordingly the locking pin or the locking piston transverse to the axis of rotation of the camshafts arranged.

Nachstehend wird die Erfindung anhand eines in insgesamt zwei Figuren dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

Figur 1
eine perspektivische Darstellung eines erfindungsgemäßen Stößel und
Figur 2
einen Schnitt durch den Stößel aus Figur 1.
The invention is explained in more detail below on the basis of an exemplary embodiment shown in a total of two figures. Show it:
Figure 1
a perspective view of a plunger according to the invention and
Figure 2
a section through the plunger of Figure 1.

Der erfindungsgemäße Stößel weist einen Boden 1 auf, der aus einem kreisringförmigen äußeren Bodenteil 2 und einem kreisförmigen inneren Bodenteil 3 gebildet ist. Das innere kreisförmige Bodenteil 3 ist koaxial in dem kreisringförmigen äußeren Bodenteil 2 angeordnet. Die beiden Bodenteile 2, 3 sind relativ zueinander verschiebbar, wobei das äußere Bodenteil 2 von zwei nicht dargestellten Außennocken und wobei das innere Bodenteil 3 von einem zwischen den Außennocken angeordneten - ebenfalls nicht dargestellten - Innennocken beaufschlagbar ist. Das innere Bodenteil 3 weist an seinem Umfang zwei einander gegenüberliegende Schlüsselfläche 4 auf. Diese Schlüsselflächen 4 dienen zur Freistellung der nicht dargestellten Außennocken. Gestrichelt dargestellt ist die Nockenkontaktfläche 5 auf dem äußeren Bodenteil 2 und die Nockenkontaktfläche 6 auf dem inneren Bodenteil 3.The tappet according to the invention has a base 1, which consists of an annular outer bottom part 2 and a circular inner bottom part 3 is formed. The inner circular bottom part 3 is coaxial in the annular outer bottom part 2 arranged. The two bottom parts 2, 3 are slidable relative to each other, the outer bottom part 2 of two not outer cam shown and wherein the inner bottom part 3 of an between the outer cam arranged - also not shown - inner cam is acted upon. The inner bottom part 3 has on its circumference two opposite key surface 4. These key areas 4 serve to exempt the outer cams, not shown. dashed the cam contact surface 5 is shown on the outer base part 2 and the cam contact surface 6 on the inner bottom part 3.

Das Verhältnis des Durchmessers Di des inneren Bodenteils 3 zum Außendurchmesser Da des äußeren Bodenteils 2 ist so bemessen, dass sich ein Quotient einstellt, der zwischen 0,5 und 0,6 liegt. Bei diesem Durchmesserverhältnis ist einerseits eine optimale Auswanderung der Nockenkontaktlinie auf dem inneren Bodenteil gewährleistet. Andererseits ist sichergestellt, dass die Breite des Außennockens trotz vergrößertem Hub auf dem inneren Bodenteil 3 nicht reduziert ist.The ratio of the diameter D i of the inner bottom part 3 to the outer diameter D a of the outer bottom part 2 is dimensioned such that a quotient is set which is between 0.5 and 0.6. With this diameter ratio, an optimal migration of the cam contact line on the inner base part is guaranteed. On the other hand, it is ensured that the width of the outer cam is not reduced despite the increased stroke on the inner base part 3.

Der Figur 2 ist zu entnehmen, dass ein Innenteil 7 vorgesehen ist, dass das innere Bodenteil 3 aufweist, und dass ein Außenteil 8 vorgesehen ist, dass das äußere Bodenteil 2 aufweist. In der Darstellung sind das Innenteil 7 und das Außenteil 8 mittels einer Arretiereinrichtung 9 miteinander arretiert. Die Arretiereinrichtung 9 umfasst u. a. einen Arretierkolben 10, der entlang einer Achse verschiebbar ist, die parallel zu den Schlüsselflächen 4 angeordnet ist.It can be seen from FIG. 2 that an inner part 7 is provided that the Has inner bottom part 3, and that an outer part 8 is provided that the has outer bottom part 2. In the illustration, the inner part 7 and that Outer part 8 locked together by means of a locking device 9. The locking device 9 includes u. a. a locking piston 10 along an axis is displaceable, which is arranged parallel to the key surfaces 4.

Das Innenteil 7 wirkt über ein nicht näher erläutertes Spielausgleichselement 11 mit wenigstens einem Gaswechselventil der Brennkraftmaschine zusammen. Das Außenteil 8 arbeitet gegen eine sog. lost-motion-Feder 12.The inner part 7 acts via a play compensation element (not explained in more detail) 11 together with at least one gas exchange valve of the internal combustion engine. The outer part 8 works against a so-called lost motion spring 12.

Das Innenteil 7 ist in einer kreisförmigen Ausnehmung 15 oder Bohrung des Außenteils 8 verdrehsicher aufgenommen. Zwischen den beiden Schlüsselflächen 4 des inneren Bodenteils 3 erstrecken sich an dessen Umfang Kreisbogenabschnitte 13, die koaxial zu der kreisförmigen Ausnehmung 15 und mit geringem radialem Spiel zu der die kreisförmige Ausnehmung 15 begrenzenden Innenwandung 14 des äußeren Bodenteils 2 angeordnet sind. Diese Ausbildung des inneren Bodenteils ermöglicht eine große Erstreckung der Nockenkontaktfläche 6 für eine große Auswanderung des inneren Nockens.The inner part 7 is in a circular recess 15 or bore of the Outer part 8 taken up against rotation. Between the two key surfaces 4 of the inner bottom part 3 extend on the circumference of circular arc sections 13, which is coaxial with the circular recess 15 and with little radial play to the boundary of the circular recess 15 Inner wall 14 of the outer bottom part 2 are arranged. This training of the inner bottom part enables a large extension of the cam contact area 6 for a large emigration of the inner cam.

Das Außenteil 8 des Stößels weist an zwei einander diametral gegenüberliegenden Stellen des äußeren Bodenteils 2 Sockel 17 auf. Der Arretierkolben 10 ist in Sockelbohrungen 18 verschiebbar aufgenommen. Diese Sockel sind vorteilhaft, wenn einbaubedingt der Arretierkolben nicht weiter unterhalb der Stößeloberfläche angeordnet sein kann.The outer part 8 of the plunger has two diametrically opposite one another Place the outer base part 2 on base 17. The locking piston 10 is slidably received in base holes 18. These bases are advantageous if the locking plunger is not further below the plunger surface due to installation can be arranged.

Im Hinblick auf eine einwandfreie Anlenkung und Beschleunigung des Stößels durch die Nocken sind die Nockenkontaktflächen 5, 6 der Bodenteile 2, 3 in einer zur Nockenwelle parallelen Krümmungsebene konvex gekrümmt. In anderen Worten: in Blickrichtung parallel zur Nockenwellenachse sind die Nockenkontaktflächen 5, 6 konvex gekrümmt. With regard to a perfect linkage and acceleration of the ram by the cams, the cam contact surfaces 5, 6 of the bottom parts 2, 3 in a plane of curvature parallel to the camshaft is convexly curved. In other Words: the cam contact surfaces are parallel to the camshaft axis in the viewing direction 5, 6 convexly curved.

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11
Bodenground
22
äußeres Bodenteilouter bottom part
33
inneres Bodenteilinner bottom part
44
Schlüsselflächekey area
55
NockenkontaktflächeCam contact surface
66
NockenkontaktflächeCam contact surface
77
Innenteilinner part
88th
Außenteilouter part
99
Arretiereinrichtunglocking
1010
Arretierkolbenlock piston
1111
hydraulisches Spielausgleichselementhydraulic lash adjuster
1212
Lost-motion-FederLost-motion spring
1313
KreisbogenabschnittArc section
1414
Innenwandunginner wall
1515
kreisförmige Ausnehmungcircular recess
16 1716 17
Sockelbase
1818
Sockelbohrungsocket hole

Claims (7)

  1. Tappet for a valve train, in particular of an internal combustion engine, the outer part (8) of which tappet comprises an outer bottom part (2) and surrounds a cylindrical inner part (7) that is provided with an inner bottom part (3), the outer part (8) and the inner part (7) being displaceable relative to each other in the actuating direction of the tappet, the outer bottom part (2) being loadable by two outer cams and the inner bottom part (3) being loadable by one inner cam arranged between the outer cams, said inner bottom part (3) having a circular contour and comprising two opposite flattened portions (4) on its periphery for clearing the outer cam, circular arc-shaped sections (13) being configured between the flattened portions (4) on the periphery of the inner bottom part (3), characterised in that the outer bottom part (2) defines by an inner wall (14), a circular recess (15) that is adapted to intersect a cam contact line of the outer cams, the inner bottom part (3) is arranged in the circular recess (15), and the peripheral, circular arc-shaped sections (13) of the inner bottom part (3) are arranged at a slight radial distance from and coaxially with the inner wall (14).
  2. Tappet according to claim 1, wherein the ratio of the outer diameter of the inner bottom part (3) to the outer diameter of the outer bottom part (2) is at least 0.4.
  3. Tappet according to claim 1, wherein the ratio of the outer diameter of the inner bottom part (3) to the outer diameter of the outer bottom part (2) lies between 0.4 and 0.7, but preferably between 0.5 and 0.6.
  4. Tappet according to claim 1, wherein a locking device (9) for the releasable locking of the outer part (8) to the inner part (7) is provided.
  5. Tappet according to claim 4, wherein the locking device (9) comprises a locking pin or a locking piston (10) which can be displaced along an axis that is parallel to the flattened portions (4).
  6. Tappet according to claim 5, wherein the outer bottom part (2) of the outer part (8) comprises two pedestals (7) that are situated diametrically opposite each other and in whose pedestal bores (18), the locking piston (10) is received for displacement.
  7. Tappet according to claim 1, wherein the cam contacting surfaces (5, 6) of the inner bottom part (7) and the outer bottom part (8) are convexly curved in a plane of curvature parallel to the camshaft axis.
EP02009906A 2001-05-17 2002-05-03 Valve tappet Expired - Lifetime EP1260681B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10123963 2001-05-17
DE10123963A DE10123963A1 (en) 2001-05-17 2001-05-17 Tappet for valve drive has two opposite flat spots on inner head part to free outer cams

Publications (3)

Publication Number Publication Date
EP1260681A2 EP1260681A2 (en) 2002-11-27
EP1260681A3 EP1260681A3 (en) 2003-01-08
EP1260681B1 true EP1260681B1 (en) 2004-03-03

Family

ID=7685090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02009906A Expired - Lifetime EP1260681B1 (en) 2001-05-17 2002-05-03 Valve tappet

Country Status (4)

Country Link
EP (1) EP1260681B1 (en)
JP (1) JP2002349213A (en)
AT (1) ATE261055T1 (en)
DE (2) DE10123963A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7401584B2 (en) 2004-07-01 2008-07-22 Schaeffler Kg Adjustable engine
DE102004056457A1 (en) * 2004-11-23 2006-06-08 Schaeffler Kg Cup tappets for an internal combustion engine
DE102005017409A1 (en) * 2005-04-15 2006-10-19 Schaeffler Kg Outer part of a switchable tappet
DE102005049774A1 (en) * 2005-10-18 2007-04-19 Robert Bosch Gmbh Device for actuating a gas exchange valve of an internal combustion engine
DE102017109017A1 (en) 2017-04-27 2018-10-31 Schaeffler Technologies AG & Co. KG Internal combustion engine and method of controlling the intake air flow rate of a combustion piston engine

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Publication number Priority date Publication date Assignee Title
DE3826365A1 (en) * 1988-08-03 1990-02-15 Bayerische Motoren Werke Ag VALVE CONTROL FOR INTERNAL COMBUSTION ENGINES
EP0620360A3 (en) * 1990-02-16 1995-01-18 Lotus Group Ltd Tappet assembly.
US5555861A (en) * 1992-04-27 1996-09-17 Iav Motor Gmbh Drive for gas exchange valves, preferably inlet valves for reciprocating internal combustion engines
DE4244287C2 (en) * 1992-04-27 2001-12-13 Iav Motor Gmbh Valve train for charge exchange valves, preferably intake valves of reciprocating internal combustion engines
DE4213856C2 (en) * 1992-04-27 1994-08-04 Iav Motor Gmbh Valve train for charge exchange valves, of reciprocating piston internal combustion engines
US5361733A (en) * 1993-01-28 1994-11-08 General Motors Corporation Compact valve lifters
DE4314619A1 (en) * 1993-05-04 1994-11-10 Schaeffler Waelzlager Kg Pestle
DE4337330C2 (en) * 1993-11-02 1996-03-21 Iav Motor Gmbh Roller tappet with two rollers per valve for valve drives of internal combustion engines with an overhead camshaft
JP3310490B2 (en) * 1994-10-27 2002-08-05 株式会社ユニシアジェックス Valve train for internal combustion engine
DE19502332A1 (en) * 1995-01-26 1996-08-01 Schaeffler Waelzlager Kg Drive for valve mechanism in IC engine
DE19652180A1 (en) * 1996-12-14 1998-06-18 Schaeffler Waelzlager Ohg Tappet for a valve train of an internal combustion engine
US5709180A (en) * 1997-02-06 1998-01-20 General Motors Corporation Narrow cam two-step lifter

Also Published As

Publication number Publication date
DE10123963A1 (en) 2002-11-21
EP1260681A3 (en) 2003-01-08
ATE261055T1 (en) 2004-03-15
JP2002349213A (en) 2002-12-04
EP1260681A2 (en) 2002-11-27
DE50200267D1 (en) 2004-04-08

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