FR2668797A1 - Cylinder head for heat engines with variable-lift valves - Google Patents

Cylinder head for heat engines with variable-lift valves Download PDF

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Publication number
FR2668797A1
FR2668797A1 FR9013967A FR9013967A FR2668797A1 FR 2668797 A1 FR2668797 A1 FR 2668797A1 FR 9013967 A FR9013967 A FR 9013967A FR 9013967 A FR9013967 A FR 9013967A FR 2668797 A1 FR2668797 A1 FR 2668797A1
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France
Prior art keywords
camshaft
valve
valves
rocker
engine
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.)
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Application number
FR9013967A
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French (fr)
Inventor
Silvetti Gabriel
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Individual
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Individual
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Priority to FR9013967A priority Critical patent/FR2668797A1/en
Publication of FR2668797A1 publication Critical patent/FR2668797A1/en
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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
    • F01L13/0036—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
    • F01L13/0042—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 with cams being profiled in axial and radial direction
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

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

Abstract

The invention relates to a device making it possible, depending on the speed and load of the engine, to cause the amount of lift of the inlet and exhaust valves to vary progressively, which makes it possible to obtain a better efficiency for the engine, to save fuel, and to reduce pollution. It consists of cam shafts (A1) with oblique cams (A3) which push the rockers (A10) as well as the tappets (A12) for controlling the opening of the valves (A18) and the rocker holders (A9) by virtue of the axial displacement of the cam shafts (A1), of the profile of the cams (A3) and of the inclination of the rockers (A10) which allows variable opening of the valves.

Description

CULASSE POUR MOTEUR ATHERMIQUE AVEC SOUPAPES A LEVEE VARIABLE. CYLINDER HEAD FOR A THERMAL ENGINE WITH VARIABLE LIFTING VALVES.

La présente invention conserne un dispositif permettant, en fonction du régime du moteur, de faire varier progressivement la levée des soupapes d'admission et d'échappement. The present invention relates to a device allowing, depending on the engine speed, to gradually vary the lift of the intake and exhaust valves.

Dans les moteur traditionnels, la levée des soupapes est fixe, quel que soit leur régime. De ce fait, la vitesse de rotation du moteur est limitée. La vitesse d'écoulement d'air dans les conduites d'aspiration varie en fonction de la vitesse de rotation du moteur, ce qui rend difficile le mélange air-carburant et entraine une mauvaise conbustion, d'où un taux de pollution élevé ainsi qu'une dépense importante de carburant. In traditional engines, the valve lift is fixed, regardless of their speed. As a result, the speed of rotation of the motor is limited. The speed of air flow in the suction lines varies according to the speed of rotation of the engine, which makes the air-fuel mixture difficult and causes poor combustion, resulting in a high pollution rate as well as '' a significant expenditure of fuel.

Le dispositif selon l'invention permet de remédier à ces inconvénients en faisant varier progressivement la levée des soupapes en fonction de la vitesse de rotation du moteur. Ceci permet d'avoir une vitesse constante d'ecoulement d'air d'aspiration et un mélange parfait à n'inporte quelle condition de marche. Les résultats étant: un meilleur rendement du moteur, une économie du carburant et une pollution minimale. The device according to the invention overcomes these drawbacks by gradually varying the valve lift as a function of the speed of rotation of the engine. This allows a constant speed of suction air flow and a perfect mixture under any operating condition. The results being: better engine performance, fuel economy and minimal pollution.

Ce dispositif comporte en effet les caractéristiques suivantes: deux ou plusieurs soupapes par cylindre montées en "V" (schema B), avec deux arbres à cames, un pour l'aspiration et l'autre pour l'échappement. Ces arbres à cames effectuent deux mouvements, un de rotation et un de translation. Ces cames ont un profil spécial, car leurs génératrices, hors partie cylindrique;sont obliques. This device indeed has the following characteristics: two or more valves per cylinder mounted in a "V" (diagram B), with two camshafts, one for the suction and the other for the exhaust. These camshafts perform two movements, one of rotation and one of translation. These cams have a special profile because their generators, excluding the cylindrical part, are oblique.

Grace au déplacement axial des arbres à cames et au profil spécial des cames, (schema "A") on obtient une ouverture variable et progressive des soupapes. Thanks to the axial displacement of the camshafts and to the special profile of the cams (diagram "A") a variable and progressive opening of the valves is obtained.

Etant donné que le profil des cames est oblique, en effectuant son mouvement de rotation, les cames viennent basculer les culbuteurs, qui à leur tour viennent appuyer sur les poussoirs et ouvrent parciellement les soupapes. Since the profile of the cams is oblique, by performing its rotational movement, the cams rock the rocker arms, which in turn press on the pushers and partially open the valves.

Lorsque les arbres à cames se déplacent axialement, les culbuteurs suivent la rotation du profildes cames et ouvrent progressivement les soupapes jusqu'à fin du mouvement axial des arbres à cames. When the camshafts move axially, the rocker arms follow the rotation of the cam profiles and gradually open the valves until the axial movement of the camshafts ends.

Le dispositif selon l'invention est destiné à obtenir un meilleur rendement du moteur, à economiser du carburant et à diminuer la pollution.  The device according to the invention is intended to obtain a better performance of the engine, to save fuel and to reduce pollution.

Schema A: coupe brisée longitudinale culasse.Diagram A: broken longitudinal section of cylinder head.

Nomenclature des pieces du schema A. List of parts in diagram A.

Al) Arbre à cames. Al) Camshaft.

A2) 1/2 palier superieur de l'arbre à cames.A2) 1/2 upper bearing of the camshaft.

A3) Came à profil spécial.A3) Special profile cam.

A4) Butée coté commande de translation de l'arbre à cames.A4) Stop on the camshaft drive control side.

A5) Cannelures à flancs en developpante. A5) Developing flank flanks.

A6) Pignon d'entrainement de l'arbre à cames.A6) Camshaft drive gear.

A7) Butée coté pignon d'entrainement de l'arbre à cames.A7) Stop on the drive pinion side of the camshaft.

A8) Ressort de maintien de l'arbre à cames et de son pignon d'entraine
ment collés contre leurs butées.A8) Retaining spring for the camshaft and its drive pinion
stuck against their stops.

A9) Porte-culbuteur mobile.A9) Movable rocker arm.

A10) Culbuteur de commande d'ouverture soupapes. A10) Valve opening control rocker.

A11) Axe de fixation du culbuteur au porte-culbuteur mobile.A11) Shaft for fixing the rocker arm to the mobile rocker arm.

A12) Poussoir de commande ouverture soupapes. A12) Valve opening control button.

A13) Culbuteur de commande translation arbre à cames. A13) Camshaft translation control rocker arm.

A14) Verin de commande translation arbre à cames.A14) Camshaft translation control cylinder.

A15) Culisseau de commande translation arbre à cames. A15) Camshaft translation control valve.

A16) Guide coulisseau.A16) Slide guide.

A17) Ressort de rappel fermeture soupapes. A17) Valve closing return spring.

A18) 1 à 4 : Soupapes. A18) 1 to 4: Valves.

Schema B : coupe brisée transversale culasse.Diagram B: broken cross section of cylinder head.

Schema C : perspective partielle longitudinale de la culasse en coupe brisée. Diagram C: partial longitudinal perspective of the breech in broken section.

Le dispositif est caratérisé par un arbre à cames (Al) avec des cames à profil oblique (A3) effectuant une levée variable des soupapes (A18) d'aspiration et d'echappement suivant le regime du moteur, le mouvement de rotation de la came (A3) vient pousser le culbuteur (A1o), qui à son tour agit sur le poussoir de commande d'ouverture de la soupape (A12), le culbuteur (A10) pousse le porte-culbuteur (A9) selon le déplacement axial de l'arbre à cames (Al) permettant une ouverture variable des soupapes (voir les soupapes (A18-2) et (A18-3). The device is characterized by a camshaft (Al) with oblique profile cams (A3) carrying out a variable lifting of the suction and exhaust valves according to the engine speed, the rotation movement of the cam (A3) pushes the rocker arm (A1o), which in turn acts on the valve opening control plunger (A12), the rocker arm (A10) pushes the rocker arm (A9) according to the axial displacement of the 'camshaft (Al) allowing variable valve opening (see valves (A18-2) and (A18-3).

Un ressort de fermeture soupape; (Ai 7) fait simultanément remonter le poussoir d'ouverture des soupapes (A12), qui en meme temps fait remon- ter le culbuteur (A10) fixé au porte-culbuteur (A9) par leur axe (Ail).  A valve closing spring; (Ai 7) simultaneously raises the valve opening valve (A12), which at the same time raises the rocker arm (A10) fixed to the rocker arm (A9) by their axis (Ail).

Ainsi la soupape est fermée. Thus the valve is closed.

Le déplacement axial de l'arbre à cames (Al) est commandé par le verin
(A14) qui pousse le basuleur (A13) qui à son tour pousse le coulisseau (A15) qui appuit sur la butée (A4) et déplace l'arbre à cames (Ai). L'arbre à cames (Al) glisse dans ses paliers (A2) et dans ses cannelures à flancs en developpante (A5) pour permettre son mouvement de translation.The axial movement of the camshaft (Al) is controlled by the actuator
(A14) which pushes the rocker (A13) which in turn pushes the slide (A15) which presses against the stop (A4) and moves the camshaft (Ai). The camshaft (Al) slides in its bearings (A2) and in its grooves on the developing flanks (A5) to allow its translational movement.

Le retour de l'arbre à cames (Al) à sa position initiale est assuré par le ressort de compression (A8) qui maintient le pignon d'entrainement d'arbre à cames (A6) contre sa butée(A7)et renvoie l'arbre à cames (Al) à sa place initiale. Le mouvement de rotation de l'arbre à cames (Al) est assuré par le pignon (A6).  The return of the camshaft (Al) to its initial position is ensured by the compression spring (A8) which holds the camshaft drive pinion (A6) against its stop (A7) and returns the camshaft (Al) in its original place. The camshaft (Al) rotational movement is provided by the pinion (A6).

Claims (7)

REVENDICATIONS. CLAIMS. 1) Dispositif pour obtenir un meilLeur rendement d'un moteur, économiser du carburant et diminuer la pollution, caractérisé par un arbre à cames (Al) effectuent un mouvement de rotation et un de translation et pourvu des cames pressentant un profil oblique (k3) de sorte à effectuer une levée variable des soupapes (A-18) d'aspiratton et d'echappement suivant le régime du moteur,à partir d'un verin (A14) de commande de la translation de l'arbre à cames (A1)-o  1) Device for obtaining better efficiency of an engine, saving fuel and reducing pollution, characterized by a camshaft (Al) effecting a rotation and a translational movement and provided with cams sensing an oblique profile (k3) so as to effect a variable lifting of the suction and exhaust valves (A-18) according to the engine speed, from a jack (A14) for controlling the translation of the camshaft (A1) -o 2) Dispositif selon la revendication 1 caractérisé en ce qusil est pourvu de culbuteurs (AiO),agissant sur le poussoir de commande d'ouverture de la soupape (A12) correspondante reliés chacun par un axe (A11) à un porte- culbuteur mobile (A9) de sorte à le pousser selon le deplacement axial de l'arbre à cames (Ai) permettant une ouverture variable des soupapes 2) Device according to claim 1 characterized in that it is provided with rockers (AiO), acting on the valve opening control button (A12) corresponding each connected by an axis (A11) to a movable rocker holder ( A9) so as to push it along the axial displacement of the camshaft (Ai) allowing variable opening of the valves 3) Dispositif selon les revendications let.2 caractérisé en ce qu'un ressort de fermeture soupape (A17) fait simultanément remonter le poussoir d'ouverture des soupapes (A12) et le culbuteur (A10) fixé au porte-culbuteur (A9) par son axe (A11) ,de sorte à assurer la fermeture de la soupape. 3) Device according to claims let.2 characterized in that a valve closing spring (A17) simultaneously raises the valve opening valve (A12) and the rocker arm (A10) fixed to the rocker arm (A9) by its axis (A11), so as to close the valve. 4) Dispositif selon la revendication 1 caractérisé en ce que le verin (A14) de deplacement axial de l'arbre à cames(Al) pousse un basculeur (A13) qui à son tour pousse un coulisseau (A15) qui appuie sur une butée (A4) permettant le deplacement rotatif de l'arbre à cames(A1). 4) Device according to claim 1 characterized in that the cylinder (A14) of axial displacement of the camshaft (Al) pushes a rocker (A13) which in turn pushes a slide (A15) which presses on a stop ( A4) allowing the rotary displacement of the camshaft (A1). 5) Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le mouvement de rotation de l'arbre à cames (Al) est assuré par un pignon(A6). 5) Device according to any one of the preceding claims, characterized in that the rotation movement of the camshaft (Al) is provided by a pinion (A6). 6) Dispositif selon les revendications 4 et 5 caractérisé en ce que le retour de l'arbre à cames (Al) à sa position initiale est assuré par un ressort de compression (A8) qui maintient le pignon d'entrainement d'arbre à cames (A6) contre une butée (A7) de sorte à renvoyer l'arbre à cames (Al) à sa place initiale. 6) Device according to claims 4 and 5 characterized in that the return of the camshaft (Al) to its initial position is ensured by a compression spring (A8) which maintains the camshaft drive pinion (A6) against a stop (A7) so as to return the camshaft (Al) to its original place. 7) Dispositif selon les revendications 1 et 5 caractérisé en ce que l'arbre à cames (Al) glisse dans son mouvement de translation dans des paliers (ail) et dans des cannelures à flancs en developpante (As).  7) Device according to claims 1 and 5 characterized in that the camshaft (Al) slides in its translational movement in bearings (garlic) and in flutes with developing sides (As).
FR9013967A 1990-11-05 1990-11-05 Cylinder head for heat engines with variable-lift valves Withdrawn FR2668797A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9013967A FR2668797A1 (en) 1990-11-05 1990-11-05 Cylinder head for heat engines with variable-lift valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9013967A FR2668797A1 (en) 1990-11-05 1990-11-05 Cylinder head for heat engines with variable-lift valves

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590577A1 (en) * 1992-09-30 1994-04-06 Mazda Motor Corporation System for controlling valve shift timing of an engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1505643A (en) * 1975-05-20 1978-03-30 British Leyland Uk Ltd Internal combustion engine
JPS5977016A (en) * 1982-10-25 1984-05-02 Kiyoshi Kobayashi Suction/exhaust valve control variable cam shaft device reacting to engine speed
EP0155261A2 (en) * 1984-03-14 1985-09-18 Hermann Weichsler Valve timing gear for an internal-combustion engine
US4587934A (en) * 1983-05-16 1986-05-13 Moores Keith J Variable-timing valve actuating mechanism
FR2583105A1 (en) * 1985-06-05 1986-12-12 Peugeot Variable control device for an internal combustion engine valve with a stem
EP0263794A1 (en) * 1986-10-07 1988-04-13 FIAT AUTO S.p.A. Valve control for overhead camshaft engines
US4850311A (en) * 1988-12-09 1989-07-25 General Motors Corporation Three dimensional cam cardanic follower valve lifter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1505643A (en) * 1975-05-20 1978-03-30 British Leyland Uk Ltd Internal combustion engine
JPS5977016A (en) * 1982-10-25 1984-05-02 Kiyoshi Kobayashi Suction/exhaust valve control variable cam shaft device reacting to engine speed
US4587934A (en) * 1983-05-16 1986-05-13 Moores Keith J Variable-timing valve actuating mechanism
EP0155261A2 (en) * 1984-03-14 1985-09-18 Hermann Weichsler Valve timing gear for an internal-combustion engine
FR2583105A1 (en) * 1985-06-05 1986-12-12 Peugeot Variable control device for an internal combustion engine valve with a stem
EP0263794A1 (en) * 1986-10-07 1988-04-13 FIAT AUTO S.p.A. Valve control for overhead camshaft engines
US4850311A (en) * 1988-12-09 1989-07-25 General Motors Corporation Three dimensional cam cardanic follower valve lifter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 186 (M-320)(1623) 25 Août 1984 & JP-A-59 077 016 ( KIYOSHI KOBAYASHI ) 2 Mai 1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590577A1 (en) * 1992-09-30 1994-04-06 Mazda Motor Corporation System for controlling valve shift timing of an engine

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