EP1876329A2 - 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
EP1876329A2
EP1876329A2 EP07111405A EP07111405A EP1876329A2 EP 1876329 A2 EP1876329 A2 EP 1876329A2 EP 07111405 A EP07111405 A EP 07111405A EP 07111405 A EP07111405 A EP 07111405A EP 1876329 A2 EP1876329 A2 EP 1876329A2
Authority
EP
European Patent Office
Prior art keywords
lever body
lever
cam follower
contact surface
center plane
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
EP07111405A
Other languages
German (de)
English (en)
Other versions
EP1876329B1 (fr
EP1876329A3 (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 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 Schaeffler KG filed Critical Schaeffler 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 charge cycle 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 supported ball joint, as well as with a longitudinal center plane of the lever body angle-aligning tap surface for a cam of a camshaft or for an actuating surface having the same effect.
  • cam followers are known to be used for stroke transmission in valve trains with indirect drive and are known in the prior art in a variety of kinematic, manufacturing engineering and mechanical designs. Due to their pivotal movement, these cam followers are common, the contact surface extending in each case on the lever body carries out a sliding movement superimposed by a rolling movement on the shaft end face of the plate lifting valve. The required angular alignment of the contact surface with respect to the shaft end surface takes place 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.
  • the wear protection measures primarily include a surface coating of one or both contact partners with wear-resistant materials. However, the workpiece preparation and the subsequent application of such layers is associated with a significantly increased manufacturing and cost overhead.
  • 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 become, so that the manufacturing effort of the cam follower and the costs incurred remain largely unchanged.
  • 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 stress on the shaft end surface 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 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 shaft end surface is contacted eccentrically by the longitudinal plane of symmetry of the contact surface per se being inclined relative to the longitudinal center plane of the lever body.
  • a cylindrical or cylindrical-end profiled roller in a conventional, ie in orthogonal to the longitudinal center plane alignment as low-friction Abgriffs simulation for the cam or for the same effect actuating surface can also be provided here.
  • the cam follower may also be equipped with a weight-reducing rigid sliding surface as a tap area.
  • 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 one another at the end sections of the lever body and the dome-shaped recess in a middle section of the lever body.
  • FIG. 1 discloses a valve drive 1 of an internal combustion engine 2 in assembly with a lever-type cam follower 4 embodied as a drag lever 3.
  • the drag lever 3 comprises a generally denoted by 5, elongated lever body with the variants explained below 5a to 5c, 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 15 and according to their variants also explained below with 15 a to 15c designated contact surface for the shaft end surface 16 of a cam lever 17 actuated by the cam follower lever 17.
  • convex and circular arc curved contact surface 15 performs a superimposed by a rolling sliding on the shaft end face 16 of the Tellerhubventils 17.
  • a reduction of the 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 is formed as a truncated cone-shaped roller 6a of Figure 3 and having designated 18, half cone angle. This is exaggerated here for better illustration and assumes in practice, for example, a value of about 1 °. Also in the event that the roller 6a has end-side end profiles, 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 section BB shown in FIG. 6 relates to the feature combination c) explained at the outset, according to which the contact surface 15c for the shaft end surface 16 of the plate-lifting valve 17 has a relation to the longitudinal center plane 19 of the lever body 5c inclined longitudinal symmetry plane 22.
  • Their angle of inclination designated by 23 is in turn greatly exaggerated and, in conjunction with the orthogonal to the longitudinal direction of the lever body 5c convex and here also arcuate curved contact surface 15c to the marked by the arrow eccentric contacting the shank end surface 16th
  • the invention is of course not limited to the single-acting lever according to the embodiments shown in Figures 1 and 2, but can also be used in the initially mentioned fully variable valve trains as well as partially variable valve trains with reversible levers become.
  • 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)
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 true EP1876329A2 (fr) 2008-01-09
EP1876329A3 EP1876329A3 (fr) 2010-04-07
EP1876329B1 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

Country Status (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11156284B2 (en) 2017-07-20 2021-10-26 Aktiebolaget Skf Self-aligning cam follower roller device

Families Citing this family (1)

* 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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09280016A (ja) 1996-04-12 1997-10-28 Kubota Corp 頭上弁エンジンの動弁装置
WO2000020730A1 (fr) 1998-10-05 2000-04-13 Eaton Automotive S.P.A. Ensemble commande des soupapes

Family Cites Families (16)

* 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
AT272762B (de) * 1966-01-26 1969-07-25 Ustav Pro Vyzkum Motorovych Vo Ventildrehvorrichtung für Brennkraftmaschinen
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
DE19644916A1 (de) * 1996-10-29 1998-04-30 Schaeffler Waelzlager Ohg Ventiltrieb
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09280016A (ja) 1996-04-12 1997-10-28 Kubota Corp 頭上弁エンジンの動弁装置
WO2000020730A1 (fr) 1998-10-05 2000-04-13 Eaton Automotive S.P.A. Ensemble commande des soupapes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11156284B2 (en) 2017-07-20 2021-10-26 Aktiebolaget Skf Self-aligning cam follower roller device

Also Published As

Publication number Publication date
DE102006031031A1 (de) 2008-01-10
EP1876329B1 (fr) 2013-08-14
EP1876329A3 (fr) 2010-04-07

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