EP1554469B1 - Cam follower of a valve gear for a motor vehicle - Google Patents

Cam follower of a valve gear for a motor vehicle Download PDF

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Publication number
EP1554469B1
EP1554469B1 EP03769402A EP03769402A EP1554469B1 EP 1554469 B1 EP1554469 B1 EP 1554469B1 EP 03769402 A EP03769402 A EP 03769402A EP 03769402 A EP03769402 A EP 03769402A EP 1554469 B1 EP1554469 B1 EP 1554469B1
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EP
European Patent Office
Prior art keywords
cam follower
cam
depressions
contacting surface
microstructure
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 - Fee Related
Application number
EP03769402A
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German (de)
French (fr)
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EP1554469A1 (en
Inventor
Georg Hofmann
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IHO Holding GmbH and Co KG
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Schaeffler KG
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Publication date
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Publication of EP1554469A1 publication Critical patent/EP1554469A1/en
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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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/16—Silencing impact; Reducing wear
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to a cam follower of a valve train of an internal combustion engine, with a contact surface for at least one cam, which contact surface has a provided with recesses for accumulation of lubricant microstructure.
  • Such a cam follower is apparent from the considered as generic forming DE 44 18 245 A1. Proposed are arbitrarily introduced on a contact surface of the cam follower, tiny recesses. In this lubricant is stored during operation of the cam follower, which should lead to a reduction in friction in the valve train.
  • the object of the invention is therefore to provide a cam follower of the type described, in which the disadvantages mentioned are eliminated by simple means.
  • this object is achieved in that the recesses form an at least largely symmetrical, grid-like microstructure, wherein two recesses per included portion of the contact surface to form a corner so arrow-like run towards each other that they at least in the vast majority of an emigration of a contact point of the cam have the contact surface.
  • the cam start-up causes the cam to push the lubricant in the recesses, which then pushes against each other at the corner point and is pressed in the direction of the counter-rotating cam.
  • the microstructure should be formed symmetrically on the contact surface.
  • it can also find a slightly different design use. The same applies to the formation of recesses with enclosed section. It is important at this point that a large number or a large number of sections has the indentations running in the direction of the migration of the cam contact point.
  • the two wells may advantageously converge towards each other such that approximately every direction of cam contact point migration will have one vertex per entrapped portion or at least a plurality of portions is swept over.
  • the portions enclosed by the recesses may have rhomboid-like formations.
  • Conceivable are generally 3- to n-shaped configurations of the enclosed sections.
  • the two arrow-like depressions per enclosed section may enclose an angle of 15 ° -75 °. Particularly advantageous may be an angle of about 45 °.
  • the contact surfaces with additional wear protection layers. These make the contact surface sufficiently hard.
  • the person skilled in the art will coordinate with one another by means of tests which are familiar to him, the carrying component, the roughness and the general design of the microstructure in such a way that optimal load-bearing behavior in the contact region is achieved. It is also clear in this connection that the microstructure according to the invention is applied at least in the area which experiences cam contact over the lifetime of the cam follower.
  • a further contribution in the direction of increasing the lifetime of the cam follower proposed according to the invention is achieved in that it is provided with initial roughnesses of R z in the range between 0.1 and 0.5 ⁇ m.
  • the invention is intended to be used in a variety of cam followers. Thought is, for example, on cup or mushroom plunger or on lever-like cam follow a variety of design.
  • FIG. 1a shows a tappet with a substantially flat course of its contact surface 2
  • Figure 2a a bucket tappet as mentioned above, but with cylindrically shaped in Nockenauswa minimumscardi approach surface 2
  • Figure 3 is a similar tappet as before, in particular from Figure 3a a dome Increase of the contact surface 2 is apparent.
  • FIG. 1 b shows a plan view of the tappet according to FIG. 1 a.
  • Its contact surface 2 has inventively designed wells 3 for the accumulation of lubricant.
  • FIGS. 1 b, 2 b and 3 a, b disclose, a symmetrical, grid-like microstructure in the region of the contact surface 2 is produced. Sections 4, which are enclosed by the recesses 3, have a substantially rhombic configuration.
  • lubricant is stored during operation of the valve train.
  • the cam pushes the lubricant in the arrow-like recesses 3 in front of him.
  • the corresponding corner points 5 there is then a collision of the amount of lubricant, whereby this is pushed in the direction of the cam contact from the wells.
  • a very good training of a bearing lubricant film is favored or guaranteed.
  • corner points 5 are also formed exactly in the edge region 6, whereby a flow of the lubricant along a wall 7 of the cam follower 1 is prevented or reduced.
  • the lattice-like microstructure according to the invention can be produced for example by a production method such as grinding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen Nockenfolger eines Ventiltriebs einer Brennkraftmaschine, mit einer Anlauffläche für wenigstens einen Nocken, welche Anlauffläche eine mit Vertiefungen zur Akkumulation von Schmierstoff versehene Mikrostruktur aufweist.The invention relates to a cam follower of a valve train of an internal combustion engine, with a contact surface for at least one cam, which contact surface has a provided with recesses for accumulation of lubricant microstructure.

Hintergrund der ErfindungBackground of the invention

Ein derartiger Nockenfolger geht aus der als gattungsbildend betrachteten DE 44 18 245 A1 hervor. Vorgeschlagen sind willkürlich auf einer Anlauffläche des Nockenfolgers eingebrachte, winzige Ausnehmungen. In diesen wird Schmierstoff während des Betriebs des Nockenfolgers gespeichert, wodurch es zu einer Reibungsminimierung im Ventiltrieb kommen soll.Such a cam follower is apparent from the considered as generic forming DE 44 18 245 A1. Proposed are arbitrarily introduced on a contact surface of the cam follower, tiny recesses. In this lubricant is stored during operation of the cam follower, which should lead to a reduction in friction in the valve train.

Diese willkürlich eingebrachten Vertiefungen ergeben jedoch in der Praxis keine zufriedenstellende Reibungsminimierung, da nicht genügend Schmierstoff in diesen akkumuliert wird. Zudem wird festgestellt, dass ggf. auch der dynamische Traganteil zu gering ist, da der Schmierstoff einfach gesagt in den Ausnehmungen verharrt.However, these indented indentations in practice do not provide satisfactory friction minimization because not enough lubricant is accumulated in them. In addition, it is found that possibly also the dynamic load-bearing ratio is too low, because the lubricant simply remains in the recesses.

Auch sind der Fachwelt Nockenfolger mit Anlaufflächen bekannt, die beispielsweise ein kanalartiges Schliffbild haben (Siehe US-A-4 856 466). Beim Nockenkontakt wird ein Teil des Schmierstoffs vor dem Nocken weg unerwünscht aus den nach außen offenen Kanälen ins Freie gedrückt. Auch hier ist klar, dass die Ausbildung eines tragenden Schmierstofffilms erschwert ist.Also known to those skilled in the art are follower cam followers having, for example, a channel-like pattern (See US-A-4,856,466). When the cam contact part of the lubricant in front of the cam away undesirable from the outwardly open channels is pressed into the open. Again, it is clear that the formation of a bearing lubricant film is difficult.

Zudem war es bisheriges Bestreben, extrem "glatt" endbearbeitete Anlaufflächen zu schaffen. Entgegen den Annahmen ist jedoch an derartig "glatten" Oberflächen der Verschleiß relativ hoch, da der Schmierstoff quasi "weggewischt" wird.In addition, it has been the endeavor to create extremely "smooth" finished contact surfaces. Contrary to the assumptions, however, the wear on such "smooth" surfaces is relatively high, since the lubricant is virtually "wiped away".

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, einen Nockenfolger der vorbeschriebenen Art zu schaffen, bei welchem die genannten Nachteile mit einfachen Mitteln beseitigt sind.The object of the invention is therefore to provide a cam follower of the type described, in which the disadvantages mentioned are eliminated by simple means.

Zusammenfassung der ErfindungSummary of the invention

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Vertiefungen eine zumindest weitestgehend symmetrische, gitterähnliche Mikrostruktur bilden, wobei zwei Vertiefungen je eingeschlossenem Abschnitt der Anlauffläche zur Bildung eines Eckpunktes so pfeilartig aufeinander zu laufen, daß sie wenigstens in überwiegende Richtung einer Auswanderung eines Kontaktpunkts des Nockens auf der Anlauffläche weisen.According to the invention, this object is achieved in that the recesses form an at least largely symmetrical, grid-like microstructure, wherein two recesses per included portion of the contact surface to form a corner so arrow-like run towards each other that they at least in the vast majority of an emigration of a contact point of the cam have the contact surface.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche, denen allein oder in Kombination mit den weiteren Ansprüchen auch selbständig schutzfähige Maßnahmen immanent sein können.Further advantageous embodiments of the invention are the subject of the dependent claims, which alone or in combination with the other claims may be intrinsically protectable measures immanent.

Aufgrund der erfindungsgemäß vorgeschlagenen gitterähnlichen Mikrostruktur, zumindest im Bereich des unmittelbaren Anlaufs des Nockens, gelingt es hervorragend, Schmierstoff zur Ausbildung eines dynamisch tragenden Schmierstofffilms anzuhäufen. Durch die speziell pfeilartige Ausrichtung von zwei Vertiefungen je eingeschlossenem Abschnitt kommt es beim Nockenanlauf dazu, dass der Nocken den Schmierstoff in den Vertiefungen quasi vor sich herschiebt, welcher dann am Eckpunkt aufeinander stößt und in Richtung des gegenläufenden Nockens gedrückt wird.Due to the inventively proposed grid-like microstructure, at least in the region of the immediate start of the cam, it is excellent to accumulate lubricant to form a dynamically supporting lubricant film. Due to the special arrow-like alignment of two recesses per enclosed section, the cam start-up causes the cam to push the lubricant in the recesses, which then pushes against each other at the corner point and is pressed in the direction of the counter-rotating cam.

Vorzugsweise soll die Mikrostruktur auf der Anlauffläche symmetrisch ausgebildet sein. Es kann jedoch auch eine hiervon leicht abweichende Gestaltung Verwendung finden. Das gleiche gilt für die Ausbildung der Vertiefungen mit eingeschlossenem Abschnitt. Wichtig ist es an dieser Stelle, dass eine Vielzahl bzw. ein Großteil von Abschnitten die pfeilartig in Richtung der Auswanderung des Nockenkontaktpunkts verlaufenden Vertiefungen hat.Preferably, the microstructure should be formed symmetrically on the contact surface. However, it can also find a slightly different design use. The same applies to the formation of recesses with enclosed section. It is important at this point that a large number or a large number of sections has the indentations running in the direction of the migration of the cam contact point.

Anders ausgedrückt können oder sollen die zwei Vertiefungen (selbstverständlich können auch mehr als zwei Vertiefungen an einem Eckpunkt aufeinander treffen) vorteilhafterweise so aufeinander zu laufen, dass annähernd bei jeder Richtung einer Auswanderung des Kontaktpunkts des Nockens ein Eckpunkt je eingeschlossenem Abschnitt oder wenigstens einer Vielzahl von Abschnitten überstrichen wird.In other words, the two wells (of course, more than two wells may meet at a vertex) may advantageously converge towards each other such that approximately every direction of cam contact point migration will have one vertex per entrapped portion or at least a plurality of portions is swept over.

Gemäß einer Ausgestaltung der Erfindung können die von den Vertiefungen eingeschlossenen Abschnitte rhombenähnliche Ausbildungen haben. Denkbar sind generell 3- bis n-eckige Gestaltungen der eingeschlossenen Abschnitte.According to one embodiment of the invention, the portions enclosed by the recesses may have rhomboid-like formations. Conceivable are generally 3- to n-shaped configurations of the enclosed sections.

Die zwei pfeilartigen Vertiefungen je eingeschlossenem Abschnitt können einen Winkel von 15° - 75° einschließen. Besonders vorteilhaft kann ein Winkel von etwa 45° sein.The two arrow-like depressions per enclosed section may enclose an angle of 15 ° -75 °. Particularly advantageous may be an angle of about 45 °.

Sind, wie erfindungsgemäß weiter vorgeschlagen, auch im unmittelbaren Randbereich der Anlauffläche Eckpunkte positioniert, so wird ein Ablaufen des Schmierstoffs entlang einer Wand des Nockenfolgers vermindert bzw. verhindert. Mit anderen Worten gesagt, verbleibt somit der zur Ausbildung des dynamisch tragenden Schmierstofffilms notwendige Betrag an Schmierstoff auf der Anlauffläche.Are, as further proposed according to the invention, also positioned in the immediate edge region of the contact surface corner points, so a drainage of the lubricant along a wall of the cam follower is reduced or prevented. In other words, the amount of lubricant required to form the dynamically supporting lubricant film thus remains on the contact surface.

Des weiteren ist es vorgeschlagen, die Kontaktflächen mit zusätzlichen Verschleißschutzschichten zu versehen. Diese gestalten die Kontaktfläche ausreichend hart. Der Fachmann wird hier durch ihm geläufige Versuche, den Traganteil, die Rauheit und die generelle Ausbildung der Mikrostruktur so aufeinander abstimmen, dass es zu einem optimalen Tragverhalten im Kontaktbereich kommt. Klar ist in diesem Zusammenhang auch, dass die erfindungsgemäße Mikrostruktur zumindest in dem Bereich aufgebracht wird, welcher über die Lebensdauer des Nockenfolgers hinweg einen Nockenkontakt erfährt.Furthermore, it is proposed to provide the contact surfaces with additional wear protection layers. These make the contact surface sufficiently hard. The person skilled in the art will coordinate with one another by means of tests which are familiar to him, the carrying component, the roughness and the general design of the microstructure in such a way that optimal load-bearing behavior in the contact region is achieved. It is also clear in this connection that the microstructure according to the invention is applied at least in the area which experiences cam contact over the lifetime of the cam follower.

Ein weiterer Beitrag in Richtung Erhöhung der Lebensdauer des erfindungsgemäß vorgeschlagenen Nockenfolgers ist dadurch geleistet, dass er mit anfänglichen Rauhheiten von Rz im Bereich zwischen 0,1 und 0,5 µm versehen wird.A further contribution in the direction of increasing the lifetime of the cam follower proposed according to the invention is achieved in that it is provided with initial roughnesses of R z in the range between 0.1 and 0.5 μm.

Gemäß einer weiteren Konkretisierung der Erfindung ist es vorgeschlagen, die Vertiefungen und somit die Mikrostruktur durch ein Fertigungsverfahren wie Schleifen aufzubringen. Hier ist beispielsweise an gegensätzlich rotierende Schleifscheiben gedacht. Denkbar und vorgesehen sind jedoch eine Vielzahl von Verfahren zum Aufbringen der Mikrostruktur wie Prägen, Walzen, Ätzen, Erodieren und ähnliches. Keinesfalls ist Schleifen hier das einzig mögliche Fertigungsverfahren.According to a further concretization of the invention, it is proposed to apply the depressions and thus the microstructure by a manufacturing process such as grinding. Here is intended, for example, to oppositely rotating grinding wheels. Conceivable and provided, however, are a variety of methods for applying the microstructure such as embossing, rolling, etching, erosion and the like. Under no circumstances is grinding here the only possible manufacturing process.

Die Erfindung soll bei einer Vielzahl von Nockenfolgern eingesetzt werden. Gedacht ist beispielsweise an Tassen- oder Pilzstößel bzw. an hebelartige Nockenfolger verschiedenartigster Ausgestaltung.The invention is intended to be used in a variety of cam followers. Thought is, for example, on cup or mushroom plunger or on lever-like cam follow a variety of design.

Kurze Beschreibung der ZeichnungShort description of the drawing

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

die Figuren 1 bis 3
in jeweils zwei Ansichten tassenartige Nockenfolger mit erfindungsgemäß aufgebrachter Mikrostruktur.
The invention is suitably explained in more detail with reference to the drawing. Show it:
Figures 1 to 3
in each case two views cup-like cam follower according to the invention applied microstructure.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Die Figuren offenbaren einen Nockenfolger 1, der hier als Tassenstößel ausgebildet ist. Dabei zeigt Figur 1a einen Tassenstößel mit einem im wesentlichen planen Verlauf dessen Anlauffläche 2, die Figur 2a einen Tassenstößel wie vorgenannt, jedoch mit in Nockenauswanderungsrichtung zylindrisch gestalteter Anlauffläche 2 und die Figur 3 einen ähnlichen Tassenstößel wie zuvor, wobei insbesondere aus Figur 3 a eine domartige Erhöhung der Anlauffläche 2 hervorgeht.The figures disclose a cam follower 1, which is designed here as a bucket tappet. In this case, Figure 1a shows a tappet with a substantially flat course of its contact surface 2, Figure 2a a bucket tappet as mentioned above, but with cylindrically shaped in Nockenauswanderungsrichtung approach surface 2 and Figure 3 is a similar tappet as before, in particular from Figure 3a a dome Increase of the contact surface 2 is apparent.

Figur 1 b zeigt eine Draufsicht auf den Tassenstößel nach Figur 1 a. Dessen Anlauffläche 2 hat erfindungsgemäß ausgebildete Vertiefungen 3 zur Akkumulation von Schmierstoff. Wie die Figuren 1 b, 2 b und 3 a, b offenbaren, ist eine symmetrische, gitterähnliche Mikrostruktur im Bereich der Anlauffläche 2 hergestellt. Abschnitte 4, welche von den Vertiefungen 3 eingeschlossen sind, besitzen eine im wesentlichen rhombenförmige Ausgestaltung.FIG. 1 b shows a plan view of the tappet according to FIG. 1 a. Its contact surface 2 has inventively designed wells 3 for the accumulation of lubricant. As FIGS. 1 b, 2 b and 3 a, b disclose, a symmetrical, grid-like microstructure in the region of the contact surface 2 is produced. Sections 4, which are enclosed by the recesses 3, have a substantially rhombic configuration.

Betrachtet man eine Auswanderung eines Kontaktpunktes AK des Nockens auf der Anlauffläche 2, so ist festzustellen, dass zwei Vertiefungen 3 je eingeschlossenem Abschnitt 4 zur Bildung eines Eckpunktes 5 pfeilartig aufeinander zu laufen. Klar ist, dass es hier lediglich bzw. zumindest um eine Vielzahl bzw. einer Überzahl von eingeschlossenen Abschnitten 4 geht, deren Vertiefungen pfeilartig in Richtung einer Auswanderung des Kontaktpunktes AK weisen.Considering an emigration of a contact point A K of the cam on the contact surface 2, it should be noted that two recesses 3 each included section 4 to arrow towards each other to form a corner point. It is clear that it is only here or at least a large number or an excess number of trapped sections 4, whose depressions point in the direction of an emigration of the contact point A K.

In den gitterartig eingebrachten Vertiefungen 3 wird Schmierstoff während des Betriebes des Ventiltriebs gespeichert. Bei Nockenanlauf schiebt der Nocken den Schmierstoff in den pfeilartig zulaufenden Vertiefungen 3 vor sich her. In den entsprechenden Eckpunkten 5 kommt es dann zu einem Zusammenstoß der Schmierstoffmenge, wodurch diese in Richtung des Nockenkontakts aus den Vertiefungen geschoben wird. Somit ist eine sehr gute Ausbildung eines tragenden Schmierstofffilms begünstigt bzw. gewährleistet.In the lattice-like recesses 3 lubricant is stored during operation of the valve train. When cam starts, the cam pushes the lubricant in the arrow-like recesses 3 in front of him. In the corresponding corner points 5, there is then a collision of the amount of lubricant, whereby this is pushed in the direction of the cam contact from the wells. Thus, a very good training of a bearing lubricant film is favored or guaranteed.

Wie aus Figur 1 b hervorgeht, sind Eckpunkte 5 auch genau im Randbereich 6 gebildet, wodurch ein Abfließen des Schmierstoffs entlang einer Wand 7 des Nockenfolgers 1 verhindert bzw. vermindert ist.As is apparent from Figure 1 b, corner points 5 are also formed exactly in the edge region 6, whereby a flow of the lubricant along a wall 7 of the cam follower 1 is prevented or reduced.

Die erfindungsgemäße gitterähnliche Mikrostruktur kann beispielsweise durch ein Fertigungsverfahren wie Schleifen hergestellt werden.The lattice-like microstructure according to the invention can be produced for example by a production method such as grinding.

Liste der Bezugszahlen- und zeichenList of reference numbers and signs

11
Nockenfolgercam follower
22
Anlaufflächeapproach surface
33
Vertiefungenwells
44
Abschnittsection
55
Eckpunktvertex
66
Randbereichborder area
6 a6 a
Randbereichborder area
77
Wandwall
88th
Wandwall
AK A K
Auswanderung KontaktpunktEmigration contact point

Claims (8)

  1. Cam follower (1) of a valve train of an internal combustion engine, said cam follower (1) comprising a contacting surface (2) for at least one cam, said contacting surface (2) comprising a microstructure having depressions (3) for the accumulation of lubricant, characterised in that the depressions (3) form an at least substantially symmetric lattice-like microstructure, and, for forming a corner point (5), two depressions (3) of each enclosed section (4) of the contacting surface (2) extend towards each other after the manner of an arrow in such a way that they point at least in a predominant direction of excursion of a contact point (AK) of the cam on the contacting surface (2).
  2. Cam follower according to claim 1, characterised in that the sections (4) enclosed by the depressions (3) have a rhombic configuration.
  3. Cam follower according to claim 1 or 2, characterised in that an immediate edge region (6, 6a) of the contacting surface (2) with a wall (7, 8) of the cam follower (1) is configured in such a way that a predominant number of the depressions (3) ends on this region with a corner point (5).
  4. Cam follower according to claim 1 or 2, characterised in that the two depressions (3) of each enclosed section (4) that extend towards each other after the manner of an arrow in excursion direction of the contact point (AK) of the cam, enclose an angle of approximately 15° - 75°.
  5. Cam follower according to claim 1, characterised in that at least one of the contact surfaces (outer surface of cam / contacting surface (2) of cam follower (1)) is provided with a titanium nitride, PVD, DLC, nitride or similar coating.
  6. Cam follower according to claim 1, characterised in that the contacting surface (2) of the cam follower (1) has an initial roughness of about 0.1 < Rz < 0.5 [µm].
  7. Cam follower according to claim 1, characterised in that the depressions are made by a fabrication method such as grinding.
  8. Cam follower according to claim 1, characterised in that the cam follower (1) is configured as a cup or a mushroom-type tappet, or as a lever-like element such as a finger lever, an oscillating lever or a rocker arm.
EP03769402A 2002-10-25 2003-10-16 Cam follower of a valve gear for a motor vehicle Expired - Fee Related EP1554469B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10249761 2002-10-25
DE2002149761 DE10249761A1 (en) 2002-10-25 2002-10-25 Cam follower of a valve train of an internal combustion engine
PCT/EP2003/011469 WO2004038184A1 (en) 2002-10-25 2003-10-16 Cam follower of a valve gear for a motor vehicle

Publications (2)

Publication Number Publication Date
EP1554469A1 EP1554469A1 (en) 2005-07-20
EP1554469B1 true EP1554469B1 (en) 2006-07-26

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EP03769402A Expired - Fee Related EP1554469B1 (en) 2002-10-25 2003-10-16 Cam follower of a valve gear for a motor vehicle

Country Status (5)

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US (1) US7185620B2 (en)
EP (1) EP1554469B1 (en)
AU (1) AU2003278092A1 (en)
DE (2) DE10249761A1 (en)
WO (1) WO2004038184A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207518A1 (en) 2012-05-07 2013-11-07 Schaeffler Technologies AG & Co. KG Lever-like cam follower
EP2682230A2 (en) 2012-07-06 2014-01-08 MAHLE International GmbH Method for producing/machining a cam
DE102013203520A1 (en) 2013-03-01 2014-09-04 Schaeffler Technologies Gmbh & Co. Kg cam follower

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US7878777B2 (en) * 2006-08-25 2011-02-01 Denso Corporation Scroll compressor having grooved thrust bearing
FR2907356B1 (en) * 2006-10-20 2009-05-22 Hef Soc Par Actions Simplifiee PIECE OF FRICTION IN LUBRIFIED ENVIRONMENT AND WHOSE SURFACE IS TEXTURED.
DE102007055039A1 (en) 2007-11-17 2009-06-04 Schaeffler Kg Structural unit for internal-combustion engine, has recesses running on entire contact area from front side to rear side of one machine part, and wall observed in sliding direction of another machine part and extending in area of recess
DE102014203205A1 (en) 2014-02-24 2015-08-27 Schaeffler Technologies AG & Co. KG Valve gear for an internal combustion engine, as well as cam for a valve camshaft of a valve train and cam follower for a valve train
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US20050217415A1 (en) 2005-10-06
WO2004038184A1 (en) 2004-05-06
DE50304386D1 (en) 2006-09-07
EP1554469A1 (en) 2005-07-20
AU2003278092A1 (en) 2004-05-13
DE10249761A1 (en) 2004-05-13
US7185620B2 (en) 2007-03-06

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