EP1554469A1 - Cam follower of a valve gear for a motor vehicle - Google Patents

Cam follower of a valve gear for a motor vehicle

Info

Publication number
EP1554469A1
EP1554469A1 EP03769402A EP03769402A EP1554469A1 EP 1554469 A1 EP1554469 A1 EP 1554469A1 EP 03769402 A EP03769402 A EP 03769402A EP 03769402 A EP03769402 A EP 03769402A EP 1554469 A1 EP1554469 A1 EP 1554469A1
Authority
EP
European Patent Office
Prior art keywords
cam follower
cam
contact surface
recesses
contact
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.)
Granted
Application number
EP03769402A
Other languages
German (de)
French (fr)
Other versions
EP1554469B1 (en
Inventor
Georg Hofmann
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
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
Application filed by INA Schaeffler KG filed Critical INA Schaeffler KG
Publication of EP1554469A1 publication Critical patent/EP1554469A1/en
Application granted granted Critical
Publication of EP1554469B1 publication Critical patent/EP1554469B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • F01L1/12—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 microstructure provided with recesses for the accumulation of lubricant.
  • cam follower emerges from DE 44 18 245 A1, which is considered to be generic. It is proposed to introduce tiny recesses arbitrarily on a contact surface of the cam follower. Lubricant is stored in these while the cam follower is in operation, which should minimize friction in the valve train.
  • the object of the invention is therefore to provide a cam follower of the type described above, in which the disadvantages mentioned are eliminated with simple means.
  • this object is achieved in that the depressions form an at least largely symmetrical, lattice-like microstructure, two depressions per enclosed section of the contact surface to form an arrow point so that they run at least in the predominant direction of an emigration of a contact point of the cam of the contact surface.
  • the microstructure should preferably be formed symmetrically on the contact surface. However, a slightly different design can also be used. The same applies to the formation of the recesses with an enclosed section. It is important at this point that a large number or a large number of sections have the depressions which run in the direction of the arrow in the direction of the emigration of the cam contact point.
  • the two depressions (of course, more than two depressions can also meet at a corner point) can or should advantageously run in such a way that approximately every direction of an emigration of the contact point of the cam has one corner point per included section or at least a plurality of sections is swept over.
  • the sections enclosed by the depressions can have rhomboid-like configurations. Triangular to n-sided designs of the enclosed sections are generally conceivable.
  • the two arrow-shaped depressions in each enclosed section can enclose an angle of 15 ° -75 °.
  • An angle of approximately 45 ° can be particularly advantageous. If, as further proposed according to the invention, corner points are also positioned in the immediate edge region of the contact surface, the lubricant will run away 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.
  • the contact surfaces with additional wear protection layers. These make the contact surface sufficiently hard.
  • the person skilled in the art will coordinate the trays, the roughness and the general design of the microstructure with one another in such a way that the trays have an optimal load behavior in the contact area.
  • the microstructure according to the invention is applied at least in the area which experiences cam contact over the life of the cam follower.
  • a further contribution towards increasing the service life of the cam follower proposed according to the invention is made by providing it with initial roughnesses of R z in the range between 0.1 and 0.5 ⁇ m.
  • the depressions and thus the microstructure by means of a manufacturing process such as grinding.
  • a manufacturing process such as grinding.
  • oppositely rotating grinding wheels are thought of.
  • a large number of methods for applying the microstructure such as embossing, rolling, etching, eroding and the like, are conceivable and provided. Grinding is by no means the only possible manufacturing process here.
  • the invention is intended to be used with a large number of cam followers. For example, a cup or mushroom tappet or a lever-like cam follower of various designs is intended.
  • FIGS 1 to 3 in two views cup-like cam followers with microstructure applied according to the invention.
  • FIG. 1a shows a cup tappet with an essentially planar course of its contact surface 2
  • FIG. 2a shows a cup tappet as mentioned above, but with a contact surface 2 designed cylindrically in the cam migration direction
  • FIG. 3 shows a similar cup tappet as before, in particular from FIG. 3a a dome-like increase in the contact surface 2 emerges.
  • Figure 1 b shows a plan view of the tappet according to Figure 1 a.
  • Its contact surface 2 has recesses 3 designed according to the invention for the accumulation of lubricant.
  • FIGS. 1 b, 2 b and 3 a, b disclose, a symmetrical, lattice-like microstructure is produced in the area of the contact surface 2.
  • Sections 4, which are enclosed by the depressions 3, have a substantially rhombic shape. If one considers the migration of a contact point A ⁇ of the cam on the contact surface 2, it can be seen that two depressions 3 per section 4 enclosed form an arrow 5 to run towards each other. It is clear that this is only or at least a plurality or a plurality of enclosed sections 4, the depressions of which point in the direction of an arrow in the direction of an emigration of the contact point A K.
  • Lubricant is stored in the recesses 3 introduced in the manner of a grid during operation of the valve train.
  • the cam pushes the lubricant in front of it in the arrow-shaped recesses 3.
  • the corresponding corner points 5 there is then a collision of the amount of lubricant, as a result of which it is pushed out of the depressions in the direction of the cam contact. This promotes or ensures a very good formation of a load-bearing lubricant film.
  • corner points 5 are also formed precisely in the edge region 6, as a result of which the lubricant flows away or is reduced along a wall 7 of the cam follower 1.
  • the grid-like microstructure according to the invention can be produced, for example, by a manufacturing process such as grinding.
  • Border area a Border area

Landscapes

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

Abstract

The invention relates to a cam follower (1) of a valve gear of an internal combustion engine, comprising a thrust surface (2) for at least one cam. Said thrust surface (2) has a microstructure for the accumulation of lubricant. According to the invention, the depressions (3) form a largely symmetrical, grid-type microstructure, whereby two depressions (3) for each enclosed section (4) of the thrust surface converge in the manner of an arrow in order to form a corner point (5), in such a way that they are oriented at least in the predominant direction of the drift of a contact point (AK) of the cam on the thrust surface.

Description

Bezeichnung der Erfindung Name of the invention
Nockenfolger eines Ventiltriebs einer BrennkraftmaschineCam follower of a valve train of an internal combustion engine
Beschreibungdescription
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 microstructure provided with recesses for the accumulation of lubricant.
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 emerges from DE 44 18 245 A1, which is considered to be generic. It is proposed to introduce tiny recesses arbitrarily on a contact surface of the cam follower. Lubricant is stored in these while the cam follower is in operation, which should minimize 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 Aus- nehmungen verharrt. Auch sind der Fachwelt Nockenfolger mit Anlaufflächen bekannt, die beispielsweise ein kanalartiges Schliffbild haben. 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 tra- genden Schmierstofffilms erschwert ist.In practice, however, these arbitrarily introduced depressions do not result in satisfactory minimization of friction, since insufficient lubricant is accumulated in them. In addition, it is found that the dynamic load share may also be too low, because, to put it simply, the lubricant remains in the recesses. The cam followers with contact surfaces are also known to experts, which have a channel-like micrograph, for example. With cam contact, some of the lubricant in front of the cam is undesirably pushed out of the channels that are open to the outside. Here too it is clear that the formation of a lubricant film is difficult.
Zudem war es bisheriges Bestreben, extrem „glatt" endbearbeitete Anlaufflächen zu schaffen. Entgegen den Annahmen ist jedoch an derartig „glatten" O- berflächen der Verschleiß relativ hoch, da der Schmierstoff quasi „wegge- wischt" wird.In addition, efforts have been made so far 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 above, in which the disadvantages mentioned are eliminated with 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 depressions form an at least largely symmetrical, lattice-like microstructure, two depressions per enclosed section of the contact surface to form an arrow point so that they run at least in the predominant direction of an emigration of a contact point of the cam of the contact surface.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Un- teransprüche, denen allein oder in Kombination mit den weiteren Ansprüchen auch selbständig schutzfähige Maßnahmen immanent sein können. 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 gegenlaufenden Nockens gedrückt wird.Further advantageous embodiments of the invention are the subject of the subclaims, which alone or in combination with the further claims can also be inherently protective measures. On the basis of the lattice-like microstructure proposed according to the invention, at least in the area of the immediate start of the cam, it is possible to accumulate lubricant to form a dynamically load-bearing lubricant film. The special arrow-like alignment of two recesses per enclosed section means that the cam pushes the lubricant in the recesses in front of it, which then collides at the corner point and is pressed in the direction of the opposing 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.The microstructure should preferably be formed symmetrically on the contact surface. However, a slightly different design can also be used. The same applies to the formation of the recesses with an enclosed section. It is important at this point that a large number or a large number of sections have the depressions which run in the direction of the arrow in the direction of the emigration 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 depressions (of course, more than two depressions can also meet at a corner point) can or should advantageously run in such a way that approximately every direction of an emigration of the contact point of the cam has one corner point per included section or at least a plurality of sections 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 sections enclosed by the depressions can have rhomboid-like configurations. Triangular to n-sided designs of the enclosed sections are generally conceivable.
Die zwei pfeilartigen Vertiefungen je eingeschlossenem Abschnitt können ei- nen Winkel von 15° - 75° einschließen. Besonders vorteilhaft kann ein Winkel von etwa 45° sein. 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. verhin- dert. Mit anderen Worten gesagt, verbleibt somit der zur Ausbildung des dynamisch tragenden Schmierstofffilms notwendige Betrag an Schmierstoff auf der Anlauffläche.The two arrow-shaped depressions in each enclosed section can enclose an angle of 15 ° -75 °. An angle of approximately 45 ° can be particularly advantageous. If, as further proposed according to the invention, corner points are also positioned in the immediate edge region of the contact surface, the lubricant will run away 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 Ver- Schleißschutzschichten 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 the trays, the roughness and the general design of the microstructure with one another in such a way that the trays have an optimal load behavior in the contact area. In this context, it is also clear that the microstructure according to the invention is applied at least in the area which experiences cam contact over the life of the cam follower.
Ein weiterer Beitrag in Richtung Erhöhung der Lebensdauer des erfindungs- gemäß vorgeschlagenen Nockenfolgers ist dadurch geleistet, dass er mit an- fänglichen Rauhheiten von Rz im Bereich zwischen 0,1 und 0,5 μm versehen wird.A further contribution towards increasing the service life of the cam follower proposed according to the invention is made by providing it 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. Die Erfindung soll bei einer Vielzahl von Nockenfolgern eingesetzt werden. Gedacht ist beispielsweise an Tassen- oder Pilzstößel bzw. an hebelartige Nockenfolger verschiedenartigster Ausgestaltung.According to a further specification of the invention, it is proposed to apply the depressions and thus the microstructure by means of a manufacturing process such as grinding. Here, for example, oppositely rotating grinding wheels are thought of. However, a large number of methods for applying the microstructure, such as embossing, rolling, etching, eroding and the like, are conceivable and provided. Grinding is by no means the only possible manufacturing process here. The invention is intended to be used with a large number of cam followers. For example, a cup or mushroom tappet or a lever-like cam follower of various designs is intended.
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:
die Figuren 1 bis 3 in jeweils zwei Ansichten tassenartige Nockenfolger mit erfindungsgemäß aufgebrachter MikroStruktur.Figures 1 to 3 in two views cup-like cam followers with microstructure applied according to the invention.
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 wesentli- chen 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 tappet. FIG. 1a shows a cup tappet with an essentially planar course of its contact surface 2, FIG. 2a shows a cup tappet as mentioned above, but with a contact surface 2 designed cylindrically in the cam migration direction, and FIG. 3 shows a similar cup tappet as before, in particular from FIG. 3a a dome-like increase in the contact surface 2 emerges.
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 her- gestellt. Abschnitte 4, welche von den Vertiefungen 3 eingeschlossen sind, besitzen eine im wesentlichen rhombenförmige Ausgestaltung. Betrachtet man eine Auswanderung eines Kontaktpunktes Aκ 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.Figure 1 b shows a plan view of the tappet according to Figure 1 a. Its contact surface 2 has recesses 3 designed according to the invention for the accumulation of lubricant. As FIGS. 1 b, 2 b and 3 a, b disclose, a symmetrical, lattice-like microstructure is produced in the area of the contact surface 2. Sections 4, which are enclosed by the depressions 3, have a substantially rhombic shape. If one considers the migration of a contact point A κ of the cam on the contact surface 2, it can be seen that two depressions 3 per section 4 enclosed form an arrow 5 to run towards each other. It is clear that this is only or at least a plurality or a plurality of enclosed sections 4, the depressions of which point in the direction of an arrow 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.Lubricant is stored in the recesses 3 introduced in the manner of a grid during operation of the valve train. When the cam starts, the cam pushes the lubricant in front of it in the arrow-shaped recesses 3. In the corresponding corner points 5 there is then a collision of the amount of lubricant, as a result of which it is pushed out of the depressions in the direction of the cam contact. This promotes or ensures a very good formation of a load-bearing lubricant film.
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 can be seen from FIG. 1 b, corner points 5 are also formed precisely in the edge region 6, as a result of which the lubricant flows away or is reduced along a wall 7 of the cam follower 1.
Die erfindungsgemäße gitterähnliche MikroStruktur kann beispielsweise durch ein Fertigungsverfahren wie Schleifen hergestellt werden. The grid-like microstructure according to the invention can be produced, for example, by a manufacturing process such as grinding.
Liste der Bezugszahlen- und zeichenList of reference numbers and characters
Nockenfolgercam follower
Anlaufflächeapproach surface
Vertiefungenwells
Abschnittsection
Eckpunktvertex
Randbereich a RandbereichBorder area a Border area
Wandwall
Wandwall
Auswanderung Kontaktpunkt Emigration contact point

Claims

Patentansprüche claims
1. Nockenfolger (1 ) eines Ventiltriebs einer Brennkraftmaschine, mit einer Anlauffläche (2) für wenigstens einen Nocken, welche Anlauffläche (2) eine mit Vertiefungen (3) zur Akkumulation von Schmierstoff versehene Mikrostruk- tur aufweist, dadurch gekennzeichnet, daß die Vertiefungen (3) eine zumindest weitestgehend symmetrische, gitterähnliche MikroStruktur bilden, wobei zwei Vertiefungen (3) je eingeschlossenem Abschnitt (4) der Anlauffläche (2) zur Bildung eines Eckpunktes (5) so pfeilartig aufeinander zu lau- fen, daß sie wenigstens in überwiegende Richtung einer Auswanderung eines Kontaktpunktes (AK) des Nockens auf der Anlauffläche (2) weisen.1. cam follower (1) of a valve train of an internal combustion engine, with a contact surface (2) for at least one cam, which contact surface (2) has a microstructure provided with recesses (3) for the accumulation of lubricant, characterized in that the recesses ( 3) form an at least largely symmetrical, lattice-like microstructure, two recesses (3) for each enclosed section (4) of the contact surface (2) to form an arrow point (5) so that they run at least one arrow so that they are at least in the predominant direction Show emigration of a contact point (A K ) of the cam on the contact surface (2).
2. Nockenfolger nach Anspruch 1 , dadurch gekennzeichnet, daß die von den Vertiefungen (3) eingeschlossenen Abschnitte (4) ein rhombenähnliche2. cam follower according to claim 1, characterized in that the enclosed by the recesses (3) sections (4) a rhomboid-like
Ausbildung haben.Have training.
3. Nockenfolger nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein unmittelbarer Randbereich (6, 6a) der Anlauffläche (2) zu einer Wand (7, 8) des Nockenfolgers (1 ) so ausgebildet ist, daß an diesem eine überwiegende Zahl der Vertiefungen (3) mit einem Eckpunkt (5) auslaufen.3. cam follower according to claim 1 or 2, characterized in that an immediate edge region (6, 6a) of the contact surface (2) to a wall (7, 8) of the cam follower (1) is formed so that a majority of this Run out depressions (3) with a corner point (5).
4. Nockenfolger nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zwei Vertiefungen (3) je eingeschlossenem Abschnitt (4), welche in Auswanderungsrichtung des Kontaktpunktes (AK) des Nockens pfeilartig aufeinander zu laufen, einen Winkel von ca. 15° - 75° einschließen. 4. cam follower according to claim 1 or 2, characterized in that the two recesses (3) each enclosed section (4), which in the emigration direction of the contact point (A K ) of the cam to run like an arrow on each other, an angle of about 15 ° - Include 75 °.
5. Nockenfolger nach Anspruch 1 , dadurch gekennzeichnet, daß wenigstens eine der Kontaktflächen (Außenmantel Nocken / Anlauffläche (2) Nocken- folger(1 )) mit einer Titannitrid-, PVD-, DLC-, Nitrid- o. ä. Schicht versehen ist.5. cam follower according to claim 1, characterized in that at least one of the contact surfaces (outer jacket cam / contact surface (2) cam follower (1)) is provided with a titanium nitride, PVD, DLC, nitride or similar layer ,
6. Nockenfolger nach Anspruch 1 , dadurch gekennzeichnet, daß der Anlauffläche (2) Nockenfolgers (1 ) eine anfängliche Rauheit von etwa 0,1 < Rz < 0,5 [μm] immanent ist.6. cam follower according to claim 1, characterized in that the contact surface (2) cam follower (1) is an initial roughness of about 0.1 <R z <0.5 [μm] immanent.
7. Nockenfolger nach Anspruch 1 , dadurch gekennzeichnet, daß die Vertiefungen durch ein Fertigungsverfahren wie Schleifen hergestellt sind.7. cam follower according to claim 1, characterized in that the recesses are made by a manufacturing method such as grinding.
8. Nockenfolger nach Anspruch 1 , dadurch gekennzeichnet, daß der Nockenfolger (1 ) als Tassen- bzw. Pilzstößel oder als hebelartiges Element wie ein Schlepp-, Schwing- bzw. Kipphebel ausgebildet ist. 8. Cam follower according to claim 1, characterized in that the cam follower (1) is designed as a cup or mushroom tappet or as a lever-like element such as a rocker arm, rocker arm or 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 true EP1554469A1 (en) 2005-07-20
EP1554469B1 EP1554469B1 (en) 2006-07-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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)

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

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DE102012207518A1 (en) 2012-05-07 2013-11-07 Schaeffler Technologies AG & Co. KG Lever-like cam follower
DE102012211864A1 (en) 2012-07-06 2014-05-22 Mahle International Gmbh Method of manufacturing / machining a cam
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Also Published As

Publication number Publication date
US20050217415A1 (en) 2005-10-06
WO2004038184A1 (en) 2004-05-06
DE50304386D1 (en) 2006-09-07
AU2003278092A1 (en) 2004-05-13
DE10249761A1 (en) 2004-05-13
US7185620B2 (en) 2007-03-06
EP1554469B1 (en) 2006-07-26

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