EP0352580B1 - Dispositif d'actionnement de soupapes d'un moteur à combustion interne - Google Patents

Dispositif d'actionnement de soupapes d'un moteur à combustion interne Download PDF

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Publication number
EP0352580B1
EP0352580B1 EP89113026A EP89113026A EP0352580B1 EP 0352580 B1 EP0352580 B1 EP 0352580B1 EP 89113026 A EP89113026 A EP 89113026A EP 89113026 A EP89113026 A EP 89113026A EP 0352580 B1 EP0352580 B1 EP 0352580B1
Authority
EP
European Patent Office
Prior art keywords
transmission lever
transmission
valve
lever
cams
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89113026A
Other languages
German (de)
English (en)
Other versions
EP0352580A1 (fr
Inventor
Reinhard Dipl.-Ing. Häfner
Hans-Jürgen Dipl.-Ing. Schacht
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.)
Caterpillar Motoren GmbH and Co KG
Original Assignee
Krupp Mak Maschinenbau GmbH
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 Krupp Mak Maschinenbau GmbH filed Critical Krupp Mak Maschinenbau GmbH
Publication of EP0352580A1 publication Critical patent/EP0352580A1/fr
Application granted granted Critical
Publication of EP0352580B1 publication Critical patent/EP0352580B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction

Definitions

  • the invention relates to an actuating device according to the preamble of claim 1.
  • a variable valve mechanism for internal combustion engines which has a central cam with a shorter stroke than a pair of side cams. These cams are designed for high and low speeds in such a way that the cams can be switched over by means of a lever device, whereby either the valve lift and / or the valve opening time is to be changed. It is also known from Brown-Boveri Communication 64 (1977) No. 4, pages 219 to 226 to change the inlet closing time of a valve of an internal combustion engine according to the Miller system on its own.
  • an actuating device for spring-loaded valves of an internal combustion engine which have cam-controlled, defined opening and closing times, a transmission lever being held adjustable via an eccentric to its assigned cam. Furthermore, an actuating device for valves of an internal combustion engine has become known from FR-A-614 057, in which an angle of rotation of a cam relative to an angle of rotation of a further cam takes place by pivoting gearwheels via a four-bar linkage and thus opening and closing times of the valve can be changed .
  • the object of the invention is to provide an actuating device for valves of an internal combustion engine, with which the opening and closing times of a valve which are independent of one another can be controlled.
  • the main advantages achieved with the invention are that a shifting of the opening times and the closing times of valves is achieved during a piston stroke by a structurally simple actuating device between the valve and the camshaft.
  • These closing times can be selected independently of one another in accordance with the cam shape, since the transmission levers each work together with an assigned cam, but carry out a common movement or opening and closing movement from a determinable time. This independence of the movement of the levers on the cams allows e.g. the opening and closing times of the valve are brought forward or later.
  • the valve train 1 of an internal combustion engine essentially comprises an actuating device consisting of two transmission levers 2 and 3, which operates on the one hand with cams 4 and on the other hand with the valve or a bumper via a tappet 5.
  • Each valve train 1 has at least two transmission levers 2 and 3 which can be actuated by differently designed cams 4a and 4b. These are arranged one above the other and held pivotably in bearings 6 and 7. The levers 2 and 3 are connected to the cams 4a and 4b via rollers 8 and 9.
  • the first transmission lever 2 located above controls, separately from the second transmission lever 3 located below, an opening process overlaid by a control process by the second transmission lever 3, which ends in a closing process.
  • the cam 4a for the first transmission lever 2 is arranged between two identically designed cams 4b for the second transmission lever 3.
  • These cams 4a and 4b have such a shape that the opening process of the valve begins instead of in the opening time ⁇ 'starting at the advanced opening time ⁇ and the closing time is brought forward and can be S or later at S ⁇ , as is also the case in the curve diagram Fig. 4 is shown in more detail in which the valve stroke s on the ordinate and on the abscissa the crank angle ⁇ is plotted.
  • the curve in a solid line shows the normal opening and closing times, whereas the curves in dashed lines show the changed opening and closing times.
  • the opening process by the first transmission lever 2 lies before the opening process by the second transmission lever 3, while the end of the cam 4a for the first lever 2 lies before the end of the cam 4b of the second lever 3.
  • the first transmission lever 2 is detached from its cams 4a via a pressure bearing 10 on the second transmission lever 3 on a pressure piece 11 during the superimposed control process.
  • This has a contour similar to an involute and is supported in a hard thrust bearing 12 of the first transmission lever 2, which is designed with the narrowest possible lubrication radius.
  • the contours of the pressure piece 11 and of the thrust bearing 12 are selected so that they allow the second transmission lever 3 to be adjusted without changing a valve stroke.
  • the two transmission levers 2 and 3 preferably have the same lever lengths and are pretensioned and supported on the respective cams 4a and 4b, for which purpose the first overhead transmission lever 2 is under the tension of a valve spring 13.
  • the second transmission lever 3 located below is under the tension of a longitudinally arranged torsion spring 14, which tries to rotate the second transmission lever 3 against the first transmission lever 2.
  • transmission levers 2 and 3 each consisting of a rocker 20, 21 and a rod 25, 26.
  • the rockers 20, 21 are held in the plunger 5 so as to be pivotable about an axis 22 and can only be displaced in a force-guided manner in the adjustment direction 31 via a transverse strand 30.
  • Rods 25, 26 are each articulated on the rockers 20, 21 via axles 23, 24, which are supported at the ends on separate eccentrics 27, 28 and which are arranged with shafts 29 which can be rotated by means of hand levers 34, so that when the shaft 29 is rotated, both eccentrics 27 , 28 can be adjusted together.
  • a valve lash adjuster 37 is provided so that no adjustment of the valve clearance takes place when the rollers 8 and 9 are adjusted via the eccentrics 27, 28.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (6)

1. Dispositif d'actionnement pour soupapes d'un moteur à combustion interne soumises à la pression d'un ressort, qui présente des moments d'ouverture et de fermeture définis et commandés par des cames (4a, 4b) dans lequel il est prévu, entre les soupapes et les cames, deux leviers de transmission (2, 3) superposés pour commander une manoeuvre de soupape (1) tandis que les deux leviers (2, 3) déterminent ensemble les moments d'ouverture et de fermeture des soupapes, caractérisé en ce que chaque commande de soupape (1) comprend au moins deux cames (4a, 4b) présentant des profils différents et assemblées l'une à l'autre sans possibilité de réglage mutuel et en ce que, à chaque came (4a, 4b) correspond un levier de transmission (2, 3) assurant sa commande et qui sont montés de façon à pouvoir être réglés indépendamment l'un de l'autre par l'intermédiaire d'un excentrique (6, 7; 27, 28) par rapport à leurs cames correspondantes (4a, 4b), tandis que le premier levier de transmission (2) commande le moment d'ouverture d'une soupape et que le deuxième levier de transmission (3) commande le moment de fermeture de cette soupape indépendamment du premier levier de transmission.
2. Dispositif selon la revendication 1, caractérisé en ce que l'un des leviers de transmission (3) est maintenu par un profil en développante de sa pièce de pression (11) dans un palier de pression (10) du premier levier de transmission (2) présentant un rayon de raccordement le plus faible possible, et que le profil de la pièce de pression (11) permet un réglage de l'autre levier de transmission (3) sans modifier la course de la soupape.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les leviers de transmission (2,3) sont supportés avec précontrainte sur la came et l'un par rapport à l'autre, de façon à ce que le premier levier de transmission (2) soit connecté à un ressort de soupape (13) et que le deuxième levier de transmission (3) soit connecté à un ressort de torsion (14) disposé longitudinalement.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que les centres de rotation des deux leviers de transmission (2, 3) sont déplacés de façon à ce qu'ils présentént chacun des mêmes longueurs de levier.
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les leviers de transmission (2, 3) comprennent deux bielles (20, 21) supportant les galets (8, 9) maintenues avec possibilité de rotation l'une par rapport à l'autre sur un axe (22) et connectées à des tiges articulées (25, 26) par l'intermédiaire d'axes (23, 24), ces tiges reposant chacune sur des excentriques réglables (26, 28) de façon à ce que les galets (8, 9) puissent être réglés de manière variable par rapport aux cames (4a et 4b).
6. Dispositif selon la revendication 5, caractérisé en ce que les bielles (20, 21) sont maintenues obligatoirement dans la direction de réglage (31) au moyen d'une fente transversale (30) et en ce que le poussoir (5) présente une compensation de jeu hydraulique (33) pour compenser le déplacement vertical dans la direction de la flèche (32).
EP89113026A 1988-07-28 1989-07-15 Dispositif d'actionnement de soupapes d'un moteur à combustion interne Expired - Lifetime EP0352580B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3825567 1988-07-28
DE3825567A DE3825567A1 (de) 1988-07-28 1988-07-28 Betaetigungsvorrichtung fuer ventile einer brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0352580A1 EP0352580A1 (fr) 1990-01-31
EP0352580B1 true EP0352580B1 (fr) 1992-06-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113026A Expired - Lifetime EP0352580B1 (fr) 1988-07-28 1989-07-15 Dispositif d'actionnement de soupapes d'un moteur à combustion interne

Country Status (3)

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EP (1) EP0352580B1 (fr)
DE (2) DE3825567A1 (fr)
FI (1) FI893569A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138527A1 (de) * 1991-11-23 1993-05-27 Volker Deuschle Variable ventilsteuerung fuer brennkraftmaschine
FI101165B (fi) * 1994-07-01 1998-04-30 Waertsilae Nsd Oy Ab Järjestely polttomoottorin venttiilin ajoituksen säätämiseksi
DE10341702A1 (de) * 2003-09-10 2005-04-28 Bayerische Motoren Werke Ag Ventiltrieb für eine Hubkolben-Brennkraftmaschine
DE602005020581D1 (de) * 2005-01-12 2010-05-27 Eaton Srl Kipphebelanordnung für Zweiphase Ventilsteuerungseinrichtung mit Einzelnockenerhebung
DE102009041426A1 (de) * 2009-09-16 2011-05-19 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit variierbarer Ventilöffnungsdauer
AT512877B1 (de) * 2012-04-26 2014-02-15 Pges Guenther Herdin Tech Buero Gmbh Ventilsteuermechanismus
AT522750A1 (de) * 2019-07-04 2021-01-15 Avl List Gmbh Variable ventiltriebvorrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812303A (en) * 1956-10-31 1959-04-22 Frederic Barnes Waldron Improvements in valve operating mechanism for internal combustion engines
FR614057A (fr) * 1925-04-06 1926-12-06 Sunbeam Motor Car Co Ltd Perfectionnements aux mécanismes de commande de soupape
GB947147A (en) * 1959-01-30 1964-01-22 Miller Ralph Improvements in or relating to valve operating mechanisms for use in internal combustion engines
FR1342703A (fr) * 1963-01-10 1963-11-08 Sulzer Ag Commande de soupape pour moteurs à combustion interne à pistons
DE2456752A1 (de) * 1974-11-30 1976-08-12 Kloeckner Humboldt Deutz Ag Ventilsteuerung fuer hubkolbenbrennkraftmaschinen
DE3521539A1 (de) * 1985-06-15 1986-12-18 Erich 7066 Baltmannsweiler Schmid Vorrichtung fuer eine nockengesteuerte hubkolbenmaschine

Also Published As

Publication number Publication date
DE3825567A1 (de) 1990-02-01
EP0352580A1 (fr) 1990-01-31
DE58901576D1 (de) 1992-07-09
FI893569A0 (fi) 1989-07-26
FI893569A (fi) 1990-01-29

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