EP1876329B1 - Galet de came à levier d'une commande de soupape d'un moteur à combustion interne - Google Patents

Galet de came à levier d'une commande de soupape d'un moteur à combustion interne Download PDF

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Publication number
EP1876329B1
EP1876329B1 EP07111405.2A EP07111405A EP1876329B1 EP 1876329 B1 EP1876329 B1 EP 1876329B1 EP 07111405 A EP07111405 A EP 07111405A EP 1876329 B1 EP1876329 B1 EP 1876329B1
Authority
EP
European Patent Office
Prior art keywords
lever
lever body
face
cam follower
picking
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.)
Not-in-force
Application number
EP07111405.2A
Other languages
German (de)
English (en)
Other versions
EP1876329A3 (fr
EP1876329A2 (fr
Inventor
Wolfgang Christgen
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co 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.)
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Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP1876329A2 publication Critical patent/EP1876329A2/fr
Publication of EP1876329A3 publication Critical patent/EP1876329A3/fr
Application granted granted Critical
Publication of EP1876329B1 publication Critical patent/EP1876329B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • 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
    • F01L1/18—Rocking arms or levers
    • F01L2001/188—Fulcrums at upper surface
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a lever-like cam follower of a valve train of an internal combustion engine for actuating a change of charge controlling Tellerhubventils, with an elongated lever body, on both sides whose longitudinal center plane extends a contact surface for the shaft end surface of the Tellerhubventils and with a dome-shaped recess on a resting in the engine pivot bearings is ball-joint-supported, as well as with a longitudinal center plane of the lever body angularly aligning tap surface for a cam of a camshaft or for an equally acting actuating surface, wherein the contact surface eccentrically contacts the shank end surface.
  • cam followers are known to be used for stroke transmission in valve trains with indirect drive and are known in the prior art in manifold kinematic, manufacturing engineering and mechanical designs. Due to their pivotal movement, these cam followers share in common that the respective contact surface extending on the lever body performs a sliding movement superimposed on a rolling movement on the shaft end surface of the plate lifting valve. The required angle mainly via a line contact between the cam and the associated Abgriffs Type otherwise ball-jointed on the pivot bearing cam follower.
  • the actuating surface which acts in the same way as the cam can also be the stroke transmission surface of a cam-driven intermediate lever, as used in fully variable valve trains for low-throttle load control in internal combustion engines of the automobile manufacturer BMW.
  • WO 00/20730 A1 discloses for a valve train of an internal combustion engine, a lever-like cam follower with a roller as a tapping surface for a cam of a camshaft and with a contact surface for the shaft end surface of a Tellerhubventils. Information that the contact surface of the lever body would contact the stem end surface of the Tellerhubventils eccentric, but this document can not be found.
  • the present invention is therefore the object of a lever-like cam follower of the type mentioned in such a way that the contact conditions between the contact surface of the lever body and the shaft end surface of the Tellerhubventils improved in favor of increased wear resistance of these contact partners or favor higher allowable contact forces with constant wear resistance with simple means be so that the manufacturing cost of the cam follower and the costs incurred remain largely unchanged.
  • the frictional forces resulting from the sliding portion of the contact surface and eccentrically acting on the shaft end surface result in comparison to conventional, i.e. Centric acting contacts to a torque on the Tellerhubventil, which is consequently excited to a greater extent and targeted for rotation.
  • the increased wear resistance of the mentioned contact partners is then based on the fact that, on the one hand, constantly changing sections of the shaft end face are involved in the transmission of the valve actuating forces, and consequently a significantly more uniform load on the shaft end face can be achieved.
  • the rotation of the Tellerhubventils leads to a decrease in the Gleitanteils while increasing the Wälzanteils the contact surface, whereby the risk of surface wear is significantly reduced by abrasive particles.
  • the eccentric contacting of the shaft end surface can be generated by selecting one of the mentioned feature combinations of the cam follower targeted and at the same time low effort and largely cost neutral compared to conventional cam followers.
  • a conventional cylindrical or cylindrical-end profiled roller is provided, but the roller bearing the roller is not aligned at right angles, but inclined to the longitudinal center plane of the lever body. Corresponding to the aforementioned half cone angle of the roller, this angle of inclination also leads to an inclination of the longitudinal center plane of the lever body and consequently to the explained eccentric displacement of the contact point on the shaft end surface.
  • the contact surface should be formed convexly curved both in the longitudinal direction of the lever body and orthogonal to the longitudinal direction.
  • Such a shaped contact surface provides, in particular in conjunction with a flat shaft end surface for a defined pressure zone, so that the occurrence of wear-promoting edge support is effectively excluded.
  • lever body to be made in favor of low production costs in a chipless forming of sheet material.
  • cam follower may be formed as a drag lever, wherein the dome-shaped recess and the contact surface are arranged opposite to the end portions of the lever body and the Abgriffs spectrum in a central portion of the lever body.
  • the cam follower may also be designed as a centrally mounted rocker arm, wherein the tap area and the contact surface are arranged opposite to the end sections of the lever body and the dome-shaped recess in a middle section of the lever body.
  • FIG. 1 is a valve train 1 of an internal combustion engine 2 in assembly with a trained as a finger lever 3, lever-like cam follower 4 disclosed.
  • the drag lever 3 comprises a generally denoted by 5, elongated lever body with the variants explained below 5a to 5b, which is made in a chipless forming of sheet material, and a roller 6, which is arranged needle-mounted on a lever body 5 rigidly mounted pin 7 and serves as a low-friction tap surface 8 for a cam 9 of a camshaft 10.
  • a dome-shaped recess 13 for ball-joint support of the finger lever 3 on a resting in the engine 2 pivot bearing 14 and a generally with 15 and according to their variants also explained below 15a to 15b designated contact surface for the shaft end surface 16 of the drag lever 3 actuated Tellerhubventils 17.
  • 15a to 15b designated contact surface for the shaft end surface 16 of the drag lever 3 actuated Tellerhubventils 17.
  • convexly and here arcuate curved contact surface 15 performs a superimposed by the rolling sliding movement on the shaft end surface 16 of the Tellerhubventils 17th out.
  • a wear of these contact partners 15 and 16 reducing rotation of the Tellerhubventils 17 about its longitudinal axis is specifically stimulated by the fact that the roller 6 as a frustoconical roller 6a according to FIG. 3 is formed and has the designated 18, half cone angle. This is exaggerated here for better illustration and assumes in practice, for example, a value of about 1 °.
  • the angular alignment of the longitudinal center plane 19 of the lever body 5a is effected by line contact of the roller 6a on the cam 9.
  • the Lever body 5a and - as out FIG. 4 can be seen - aligned to the longitudinal center plane 19 mirror-symmetrical contact surface 15a inclined by half the cone angle 18 relative to the shaft end surface 16.
  • the contact surface 15a is also convex orthogonal to the longitudinal direction of the lever body 5a convex and here also circular arc-shaped, so that the eccentric contacting of the shaft end surface 16 takes place at the position indicated by the arrow.
  • the bolt 7 is arranged in non-orthogonal alignment with respect to the longitudinal center plane 19 of the lever body 5b, while the roller 6 is formed as a substantially cylindrical roller 6b known geometry.
  • a denoted by 20 and again exaggerated illustrated angle of inclination characterizes the inclination of the bolt 7 relative to the orthogonal 21 to the longitudinal center plane 19 of the lever body 5b. It is readily apparent that also the inclined in the lever body 5b aligned bolt 7 to the in FIG. 4 shown inclination of the longitudinal center plane 19 of the lever body 5b relative to the longitudinal axis of the Tellerhubventils 17 and consequently to the eccentric contacting of the shaft end surface 16 leads.
  • the contact surfaces 15a and 15b are identical.
  • the invention is of course not limited to the single-acting lever according to the in the Figures 1 and 2 shown embodiments, but can also be used in the initially mentioned fully variable valve trains as well as partially variable valve trains with reversible levers.
  • switchable levers are composed of a plurality of individual levers which can be coupled by means of a locking mechanism, one of these individual levers being supported on the pivot bearing in ball-joint fashion and having one of the described combinations of features.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Mechanically-Actuated Valves (AREA)

Claims (5)

  1. Suiveur de came de type à levier (4) d'une commande de soupape (1) d'un moteur à combustion interne (2) pour l'actionnement d'une soupape en champignon (17) commandant son changement de charge, comprenant un corps de levier allongé (5, 25), sur lequel s'étend une surface de contact (15, 15a, 15b) pour la surface d'extrémité de tige (16) de la soupape en champignon (17), de chaque côté du plan médian longitudinal (19) dudit corps de levier, et lequel suiveur de came est supporté par une articulation sphérique avec un évidement (13) en forme de calotte sur un palier pivotant (14) monté en appui dans le moteur à combustion interne, et comprenant une surface de prise (8) orientant angulairement le plan médian longitudinal (19) du corps de levier (5, 25), pour une came (9) d'un arbre à cames (10) ou pour une surface d'actionnement de même effet, la surface de contact (15, 15a, 15b) venant en contact de manière excentrée avec la surface d'extrémité de tige (16), caractérisé en ce que le suiveur de came (4) présente l'une des combinaisons de caractéristiques a) à b) suivantes :
    a) on prévoit en tant que surface de prise (8) un galet (6a) de forme tronconique, qui est disposé de manière supportée sur palier lisse ou palier à roulement sur un goujon (7) fixé rigidement sur le corps de levier (5a) et orienté perpendiculairement à son plan médian longitudinal (19), la surface de contact (15a) étant réalisée avec une symétrie spéculaire par rapport au plan médian longitudinal (19) ;
    b) on prévoit en tant que surface de prise (8) un galet (6b) essentiellement cylindrique qui est disposé de manière supportée sur palier lisse ou palier à roulement sur un goujon (7) fixé rigidement sur le corps de levier (5b) et orienté non perpendiculairement à son plan médian longitudinal (19), la surface de contact (15b) étant réalisée avec une symétrie spéculaire par rapport au plan médian longitudinal (19).
  2. Suiveur de came de type à levier selon la revendication 1, caractérisé en ce que la surface de contact (15, 15a, 15b) est réalisée avec une courbure convexe à la fois dans la direction longitudinale du corps de levier (5, 5a, 5b, 25) et perpendiculairement à sa direction longitudinale.
  3. Suiveur de came de type à levier selon la revendication 1, caractérisé en ce que le corps de levier (5, 25) est fabriqué par un procédé de façonnage sans enlèvement de copeaux en un matériau en tôle.
  4. Suiveur de came de type à levier selon la revendication 1, caractérisé en ce que le suiveur de came (4) est réalisé sous forme de culbuteur (3), l'évidement en forme de calotte (13) et la surface de contact (15) étant disposés à l'opposé au niveau des portions d'extrémité (11, 12) du corps de levier (5) et la surface de prise (8) étant disposée dans une portion centrale (26) du corps de levier (5).
  5. Suiveur de came de type à levier selon la revendication 1, caractérisé en ce que le suiveur de came (4) est réalisé sous forme de levier oscillant (24), la surface de prise (8) et la surface de contact (15) étant disposées à l'opposé au niveau des portions d'extrémité (11, 12) du corps de levier (25) et l'évidement en forme de calotte (13) étant disposé dans une portion centrale (26) du corps de levier (25).
EP07111405.2A 2006-07-05 2007-06-29 Galet de came à levier d'une commande de soupape d'un moteur à combustion interne Not-in-force EP1876329B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006031031A DE102006031031A1 (de) 2006-07-05 2006-07-05 Hebelartiger Nockenfolger eines Ventiltriebs einer Brennkraftmaschine

Publications (3)

Publication Number Publication Date
EP1876329A2 EP1876329A2 (fr) 2008-01-09
EP1876329A3 EP1876329A3 (fr) 2010-04-07
EP1876329B1 true EP1876329B1 (fr) 2013-08-14

Family

ID=38596164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07111405.2A Not-in-force EP1876329B1 (fr) 2006-07-05 2007-06-29 Galet de came à levier d'une commande de soupape d'un moteur à combustion interne

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EP (1) EP1876329B1 (fr)
DE (1) DE102006031031A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013102150A1 (de) * 2013-03-05 2014-09-25 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Schlepphebelanordnung
DE102017212521A1 (de) 2017-07-20 2019-01-24 Aktiebolaget Skf Selbstausrichtende Nockenfolgerollenvorrichtung

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH220829A (de) * 1940-11-23 1942-04-30 Porsche Kg Vorrichtung zum selbsttätigen Verdrehen mittelbar betätigter Ventile ventilgesteuerter Brennkraftmaschinen gegenüber ihrem Sitz.
US2572106A (en) * 1949-12-01 1951-10-23 Gen Motors Corp Valve rotating device
DE903151C (de) * 1950-05-11 1954-02-01 Fiat Spa Brennkraftmaschine mit Tellerventilen
FR1030167A (fr) * 1950-12-27 1953-06-10 Perfectionnements à la commande des soupapes pour moteurs à combustion interne
FR1052163A (fr) * 1951-03-23 1954-01-21 Fiat Spa Dispositif pour produire la rotation des soupapes dans les moteurs à soupapes en tête
FR62166E (fr) * 1951-11-23 1955-06-10 Perfectionnements à la commande des soupapes pour moteurs à combustion interne
DE931076C (de) * 1953-05-16 1955-08-01 Volkswagenwerk G M B H Zwangsweise arbeitende Ventildreheinrichtung, insbesondere fuer Brennkraftmaschinen
DE959422C (de) * 1955-05-12 1957-03-07 Maschf Augsburg Nuernberg Ag Drehbares Ventil fuer Brennkraftmaschinen
GB1149472A (en) * 1966-01-26 1969-04-23 Ustav Pro Vyzkum Motorovych Vo Valve for internal combustion engines
DE2044727A1 (de) * 1970-09-10 1972-03-16 Prelle, Erich, 3011 Egestorf Vorrichtung zum Drehen eines axial bewegbaren Bauteiles, insbesondere eines Ventils für Verbrennungskraftmaschinen
FR2573478B1 (fr) * 1984-11-19 1987-02-06 Peugeot Dispositif a un seul culbuteur, pour l'actionnement de deux soupapes
DE9116143U1 (de) * 1991-04-22 1992-03-19 Steyr-Daimler-Puch Ag, Wien Ventilhebel für Brennkraftmaschinen
JPH09280016A (ja) * 1996-04-12 1997-10-28 Kubota Corp 頭上弁エンジンの動弁装置
DE19644916A1 (de) * 1996-10-29 1998-04-30 Schaeffler Waelzlager Ohg Ventiltrieb
IT1302601B1 (it) 1998-10-05 2000-09-29 Eaton Automotive Spa Bilanciere dotato di elemento idraulico nel fulcro per un treno dicomando di valvole.
JP2001152817A (ja) * 1999-12-01 2001-06-05 Teikoku Piston Ring Co Ltd ロッカアーム及び内燃機関の動弁機構
JP2002276309A (ja) * 2001-03-22 2002-09-25 Nsk Ltd ロッカーアーム
JP2004225551A (ja) * 2003-01-20 2004-08-12 Koyo Seiko Co Ltd カムフォロア

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Publication number Publication date
EP1876329A3 (fr) 2010-04-07
DE102006031031A1 (de) 2008-01-10
EP1876329A2 (fr) 2008-01-09

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