EP0194922B1 - Valvedrive for an internal-combustion engine having four v-inclined valves and a centrally disposed spark plug - Google Patents

Valvedrive for an internal-combustion engine having four v-inclined valves and a centrally disposed spark plug Download PDF

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Publication number
EP0194922B1
EP0194922B1 EP86400443A EP86400443A EP0194922B1 EP 0194922 B1 EP0194922 B1 EP 0194922B1 EP 86400443 A EP86400443 A EP 86400443A EP 86400443 A EP86400443 A EP 86400443A EP 0194922 B1 EP0194922 B1 EP 0194922B1
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EP
European Patent Office
Prior art keywords
valves
spark plug
cylinder
rockers
camshaft
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
Application number
EP86400443A
Other languages
German (de)
French (fr)
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EP0194922A1 (en
Inventor
Jean-Claude Gallot
Pierre Lauvin
Roger Lombard
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0194922A1 publication Critical patent/EP0194922A1/en
Application granted granted Critical
Publication of EP0194922B1 publication Critical patent/EP0194922B1/en
Expired 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/255—Hydraulic tappets between cam and rocker arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02B2275/20—SOHC [Single overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Definitions

  • the invention relates to devices which equip certain cylinder heads of internal combustion engines and which actuate, for each combustion chamber associated with an engine cylinder, two intake valves and two exhaust valves arranged in a V, this is ie inclined in pairs on either side of an axial plane of the cylinder, by means of a camshaft at the central head and at least two rocker arms.
  • a spark plug being arranged, for each cylinder, so that its electrodes are located in the combustion chamber, in the vicinity of the axis of the cylinder, therefore between the four valves, the spark plug is necessarily inclined, as well as a tubular well ensuring its access, so as to pass near the camshaft without touching it. This well is therefore located between two of the four valves and between the two corresponding rocker arms.
  • EP-A-0 141 527 published after the priority date of the present application, describes a device where the two pairs of valves form a V (or dihedron) in which two axes of rocker arms are located above a camshaft, parallel to this one. But to be actuated directly by the cams, the rocker arms are necessarily close to the camshaft and relatively not far from the combustion chamber, which implies a relatively wide opening angle of the V.
  • the object of the invention is to produce, in an engine with four V-inclined valves and a central spark plug per cylinder, a relatively compact and particularly reliable valve actuation device, possibly fitted with a means of compensating for backlash attenuating. its operating noise.
  • the device according to the invention equips a cylinder head in which each combustion chamber is associated with two pairs of valves respectively inclined on either side of an axial plane of the corresponding cylinder, while a spark plug well is disposed between the two valves of one of the two pairs, roughly parallel to these two valves.
  • the device comprises, for actuating the valves, a central camshaft situated in the vicinity of said axial plane and, for each cylinder, at least two rocker arms which are further from the combustion chamber than the camshaft and which tilt respectively on two axes parallel to the camshaft located on either side of said axial plane.
  • each rocker arm and the camshaft is interposed a plunger substantially parallel to the cylinder, and for each cylinder, the rocker arm axis disposed on the same side as the spark plug well is carried, like the other axis , by two bearings located on either side of the rocker arms and is disposed between the well and said axial plane.
  • the device illustrated in the drawings comprises, in a cylinder head 1 of an internal combustion engine, a combustion chamber 2 at the top of which is screwed a spark plug 3 engaged in an inclined tubular well 4 passing through a cover 5 shown only at Figure 1.
  • This chamber 2 faces a cylinder 6 of the engine, and there open two intake ducts 7 and two exhaust ducts 8 closable by valves 9, 10 and 11, 12 arranged in V, it is that is to say inclined in pairs on either side of a plane PP passing through the axis of the cylinder 6.
  • the electrodes of the spark plug 3 are located approximately in the axis of the cylinder 6 and surrounded by the four valves 9 -12.
  • the well 4 is located between the two intake valves 9, 10 and approximately parallel to them.
  • the valves 9-12 are actuated by a device comprising a central camshaft 13 whose axis is substantially perpendicular to that of the cylinder 6 and located in the plane PP, and several rockers 14, 15 or 16, 17 each carried by the 'one of two axes 18, 19 parallel to the camshaft.
  • the rocker arms 14-17 are further from the chamber 2 than the camshaft 13 and are connected to the latter each by one of. several pushers 20, 21, 22 or 23, 24 parallel to the cylinder 6 and aligned in the vicinity of the plane PP.
  • the two axes 18, 19 are each carried by two bearings 25, 26 or 27, 28 fixed to the cylinder head 1 on either side of the rocker arms 14-17, and are each located between the plane PP and one of the pairs valves 9, 10 or 11, 12.
  • the axis 18 located on the side of the spark plug well 4 passes by without touching it.
  • each intake valve 9, 10 is actuated by one of two rockers 14 rocking on the axis 18 on either side of the well 4 and cooperating respectively with one of two pushers 20, 22, while the two exhaust valves 11, 12 are actuated by a double rocker arm 15 rocking on the axis 19 and cooperating with a pusher 21.
  • the three plungers 20, 21, 22, aligned in line with the plane PP slide in a bar 29 constituting the aforementioned guide and forming a body with the bearings 25, 26. In the case of an engine with several cylinders aligned parallel to the camshaft 13, this bar 29 is extended by one end 29a beyond at least one of the bearings 25, 26.
  • each pair of valves 9-10, 11-12 is actuated by one of the two double rocker arms 16, 17 rocking respectively on one of the two axes 18, 19 and respectively cooperating with one of the two parallel pushers 23, 24.
  • the guide 30 of each of these forms one body with only one of the bearings 27, 28, a bearing such as 28 possibly comprising two guides 30, 30a for two pushers 24, 24a cooperating respectively with rocker arms associated with two neighboring cylinders.
  • the fork formed by the double rocker arm 16 overlaps the well 4.
  • the installation of the device in the cylinder head 1 is relatively compact for an engine with four valves per cylinder and with central spark plug, and thanks to the location of the rocker shafts inside the V formed by the valves 9-12 and by the spark plug well 4, in the part of this V sufficiently distant from the combustion chamber 2, therefore sufficiently wide, the axis located on the side of the spark plug well 4 does not interfere with that -this and can therefore be carried rigidly by two bearings.
  • the presence of the pushers 20-22 between the camshaft 18 and the rocker arms 14-17 makes it possible to accommodate in this V-shaped space an automatic device for adjusting the operating clearance of the valves by incorporating in each pushrod a means of 'known telescopic hydraulic damping.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

L'invention est relative aux dispositifs qui équipent certaines culasses de moteurs à combustion interne et qui actionnent, pour chaque chambre de combustion associée à un cylindre du moteur, deux soupapes d'admission et deux soupapes d'échappement disposées en V, c'est-à-dire inclinées par paires de part et d'autre d'un plan axial du cylindre, au moyen d'un arbre à cames en tête central et d'au moins deux culbuteurs.The invention relates to devices which equip certain cylinder heads of internal combustion engines and which actuate, for each combustion chamber associated with an engine cylinder, two intake valves and two exhaust valves arranged in a V, this is ie inclined in pairs on either side of an axial plane of the cylinder, by means of a camshaft at the central head and at least two rocker arms.

Une bougie d'allumage étant agencée, pour chaque cylindre, de manière que ses électrodes soient situées, dans la chambre de combustion, au voisinage de l'axe du cylindre, donc entre les quatre soupapes, la bougie est nécessairement inclinée, ainsi qu'un puits tubulaire assurant son accès, de façon à passer près de l'arbre à cames sans le toucher. Ce puits se trouve donc entre deux des quatre soupapes et entre les deux culbuteurs correspondants.A spark plug being arranged, for each cylinder, so that its electrodes are located in the combustion chamber, in the vicinity of the axis of the cylinder, therefore between the four valves, the spark plug is necessarily inclined, as well as a tubular well ensuring its access, so as to pass near the camshaft without touching it. This well is therefore located between two of the four valves and between the two corresponding rocker arms.

Dans une disposition connue par le GB-A-2 016 084, cette implantation est rendue possible en articulant les deux culbuteurs en question, de part et d'autre du puits de bougie, chacun en porte-à-faux sur un axe parallèle à l'arbre à cames ou bien sur un pivot cylindrique ou sphérique porté par une tige sensiblement parallèle à la soupape correspondante et fixée à la culasse. Ces montages en porte-à-faux ou sur une tige risquent de ne pas procurer une fiabilité suffisante à moins de dimensionner largement lesdits axe et tige, ce qui accroit la masse, l'encombrement et le prix de la culasse.In an arrangement known from GB-A-2 016 084, this installation is made possible by articulating the two rockers in question, on either side of the spark plug well, each in cantilever on an axis parallel to the camshaft or else on a cylindrical or spherical pivot carried by a rod substantially parallel to the corresponding valve and fixed to the cylinder head. These cantilever or rod mountings may not provide sufficient reliability unless the dimensions of said pin and rod are largely dimensioned, which increases the mass, size and price of the cylinder head.

Le EP-A-0 141 527, publié après la date de priorité de la présente demande, décrit un dispositif où les deux paires de soupapes forment un V (ou dièdre) dans lequel deux axes de culbuteurs sont situés au-dessus d'un arbre à cames, parallèlement à celui-ci. Mais pour être actionnés directement par les cames, les culbuteurs sont nécessairement proches de l'arbre à cames et relativement peu éloignés de la chambre de combustion, ce qui implique un relativement large angle d'ouverture du V.EP-A-0 141 527, published after the priority date of the present application, describes a device where the two pairs of valves form a V (or dihedron) in which two axes of rocker arms are located above a camshaft, parallel to this one. But to be actuated directly by the cams, the rocker arms are necessarily close to the camshaft and relatively not far from the combustion chamber, which implies a relatively wide opening angle of the V.

Il s'ensuit :

  • - un encombrement important de la partie supérieure du dispositif en direction transversale à l'arbre, donc une grande largeur de culasse ;
  • - et une forte inclinaison de la bougie par rapport à l'axe du cylindre, ce qui pénalise son implantation au sommet de la chambre de combustion.
It follows:
  • - a large size of the upper part of the device in the direction transverse to the shaft, therefore a large breech width;
  • - And a strong inclination of the spark plug relative to the axis of the cylinder, which penalizes its implantation at the top of the combustion chamber.

L'invention a pour but de réaliser, dans un moteur à quatre soupapes inclinées en V et une bougie centrale par cylindre, un dispositif d'actionnement des soupapes relativement peu encombrant et particulièrement fiable, éventuellement équipé d'un moyen de rattrapage de jeu atténuant son bruit de fonctionnement.The object of the invention is to produce, in an engine with four V-inclined valves and a central spark plug per cylinder, a relatively compact and particularly reliable valve actuation device, possibly fitted with a means of compensating for backlash attenuating. its operating noise.

Le dispositif selon l'invention équipe une culasse dans laquelle chaque chambre de combustion est associée à deux paires de soupapes respectivement inclinées de part et d'autre d'un plan axial du cylindre correspondant, tandis qu'un puits de bougie est disposé entre les deux soupapes de l'une des deux paires, à peu près parallèlement à ces deux soupapes.The device according to the invention equips a cylinder head in which each combustion chamber is associated with two pairs of valves respectively inclined on either side of an axial plane of the corresponding cylinder, while a spark plug well is disposed between the two valves of one of the two pairs, roughly parallel to these two valves.

Le dispositif comprend, pour actionner les soupapes, un arbre à cames central situé au voisinage dudit plan axial et, pour chaque cylindre, au moins deux culbuteurs qui sont plus éloignés de la chambre de combustion que l'arbre à cames et qui basculent respectivement sur deux axes parallèles à l'arbre à cames situés de part et d'autre dudit plan axial.The device comprises, for actuating the valves, a central camshaft situated in the vicinity of said axial plane and, for each cylinder, at least two rocker arms which are further from the combustion chamber than the camshaft and which tilt respectively on two axes parallel to the camshaft located on either side of said axial plane.

Suivant l'invention, entre chaque culbuteur et l'arbre à cames est interposé un poussoir sensiblement parallèle au cylindre, et pour chaque cylindre, l'axe de culbuteur disposé du même côté que le puits de bougie est porté, comme l'autre axe, par deux paliers situés de part et d'autre des culbuteurs et est disposé entre le puits et ledit plan axial.According to the invention, between each rocker arm and the camshaft is interposed a plunger substantially parallel to the cylinder, and for each cylinder, the rocker arm axis disposed on the same side as the spark plug well is carried, like the other axis , by two bearings located on either side of the rocker arms and is disposed between the well and said axial plane.

Cette disposition, avec poussoirs entre arbre à cames et culbuteurs, permet en éloignant ceux-ci de la chambre de combustion, de former un V d'angle plus faible et par suite de réduire les inconvénients des dispositifs connus mentionnés ci-dessus.This arrangement, with pushers between camshaft and rocker arms, allows them to move away from the combustion chamber, to form a V with a smaller angle and consequently to reduce the drawbacks of the known devices mentioned above.

Selon d'autres caractéristiques avantageuses de l'invention :

  • - les deux soupapes voisines du puits de bougie sont actionnées respectivement par deux culbuteurs basculant sur le même axe, tandis que l'autre paire de soupapes est actionnée par un culbuteur double basculant sur le deuxième axe, et les trois culbuteurs coopèrent respectivement avec l'un de trois poussoirs parallèles et alignés ;
  • - chaque paire de soupapes est actionnée par l'un de deux culbuteurs doubles basculant respectivement sur l'un des deux axes et coopérant chacun avec l'un de deux poussoirs parallèles, l'un des deux culbuteurs chevauchant le puits de bougie ;
  • - les poussoirs, situés au voisinage dudit plan axial, coulissent chacun dans un guide venu de matière avec au moins l'un des deux paliers portant l'axe du culbuteur correspondant ;
  • - les poussoirs comportent chacun un dispositif hydraulique de rattrapage de jeu.
According to other advantageous features of the invention:
  • - the two valves adjacent to the spark plug well are actuated respectively by two rocker arms rocking on the same axis, while the other pair of valves is actuated by a double rocker arm rocking on the second axis, and the three rockers cooperate respectively with the one of three parallel and aligned pushers;
  • - Each pair of valves is actuated by one of two double rockers rocking respectively on one of the two axes and each cooperating with one of two parallel pushers, one of the two rockers overlapping the spark plug well;
  • - The pushers, located in the vicinity of said axial plane, each slide in a guide made in one piece with at least one of the two bearings carrying the axis of the corresponding rocker arm;
  • - The pushers each include a hydraulic backlash device.

Deux exemples non limitatifs de réalisation d'un dispositif d'actionnement des soupapes d'un moteur selon l'invention sont décrits ci-après, avec référence aux dessins annexés sur lesquels :

  • - la Figure 1 est une vue en élévation latérale d'un premier mode de réalisation du dispositif d'actionnement selon l'invention ;
  • - la Figure 2 est une vue de dessus du dispositif de la Figure 1, une pièce supérieure étant retirée ;
  • - la Figure 3 est une vue en coupe partielle suivant la ligne III-III de la Figure 1 ;
  • - la Figure 4 est une vue analogue à celle de la Figure 2, d'un second mode de réalisation du dispositif selon l'invention.
Two nonlimiting examples of embodiment of a device for actuating the valves of an engine according to the invention are described below, with reference to the appended drawings in which:
  • - Figure 1 is a side elevational view of a first embodiment of the actuating device according to the invention;
  • - Figure 2 is a top view of the device of Figure 1, an upper part being removed;
  • - Figure 3 is a partial sectional view along line III-III of Figure 1;
  • - Figure 4 is a view similar to that of Figure 2, of a second embodiment of the device according to the invention.

Le dispositif illustré aux dessins comporte, dans une culasse 1 d'un moteur à combustion interne, une chambre de combustion 2 au sommet de laquelle est vissée une bougie d'allumage 3 engagée dans un puits tubulaire incliné 4 traversant un couvercle 5 représenté uniquement à la Figure 1. Cette chambre 2 fait face à un cylindre 6 du moteur, et y débouchent deux conduits d'admission 7 et deux conduits d'échappement 8 obturables par des soupapes 9, 10 et 11, 12 disposées en V, c'est-à-dire inclinées par paire de part et d'autre d'un plan PP passant par l'axe du cylindre 6. Les électrodes de la bougie 3 se trouvent approximativement dans l'axe du cylindre 6 et entourées par les quatre soupapes 9-12. Le puits 4 est situé entre les deux soupapes d'admission 9, 10 et à peu près parallèle à celles-ci.The device illustrated in the drawings comprises, in a cylinder head 1 of an internal combustion engine, a combustion chamber 2 at the top of which is screwed a spark plug 3 engaged in an inclined tubular well 4 passing through a cover 5 shown only at Figure 1. This chamber 2 faces a cylinder 6 of the engine, and there open two intake ducts 7 and two exhaust ducts 8 closable by valves 9, 10 and 11, 12 arranged in V, it is that is to say inclined in pairs on either side of a plane PP passing through the axis of the cylinder 6. The electrodes of the spark plug 3 are located approximately in the axis of the cylinder 6 and surrounded by the four valves 9 -12. The well 4 is located between the two intake valves 9, 10 and approximately parallel to them.

Les soupapes 9-12 sont actionnées par un dispositif comprenant un arbre à cames central 13 dont l'axe est sensiblement perpendiculaire à celui du cylindre 6 et situé dans le plan PP, et plusieurs culbuteurs 14, 15 ou 16, 17 portés chacun par l'un de deux axes 18, 19 parallèles à l'arbre à cames. Les culbuteurs 14-17 sont plus éloignés de la chambre 2 que l'arbre à cames 13 et sont reliés à celui-ci chacun par l'un de . plusieurs poussoirs 20, 21, 22 ou 23, 24 parallèles au cylindre 6 et alignés au voisinage du plan PP. Les deux axes 18, 19 sont portés chacun par deux paliers 25, 26 ou 27,28 fixés à la culasse 1 de part et d'autre des culbuteurs 14-17, et sont situés chacun entre le plan PP et l'une des paires de soupapes 9, 10 ou 11, 12. L'axe 18 situé du côté du puits 4 de bougie passe à côté de celui-ci sans le toucher.The valves 9-12 are actuated by a device comprising a central camshaft 13 whose axis is substantially perpendicular to that of the cylinder 6 and located in the plane PP, and several rockers 14, 15 or 16, 17 each carried by the 'one of two axes 18, 19 parallel to the camshaft. The rocker arms 14-17 are further from the chamber 2 than the camshaft 13 and are connected to the latter each by one of. several pushers 20, 21, 22 or 23, 24 parallel to the cylinder 6 and aligned in the vicinity of the plane PP. The two axes 18, 19 are each carried by two bearings 25, 26 or 27, 28 fixed to the cylinder head 1 on either side of the rocker arms 14-17, and are each located between the plane PP and one of the pairs valves 9, 10 or 11, 12. The axis 18 located on the side of the spark plug well 4 passes by without touching it.

Les poussoirs 20-24 coulissent chacun dans un guide 29, 30 venu de matière avec au moins l'un des paliers 25 à 28. Dans le mode de réalisation des Figures 1 à 3, chaque soupape d'admission 9, 10 est actionnée par l'un de deux culbuteurs 14 basculant sur l'axe 18 de part et d'autre du puits 4 et coopérant respectivement avec l'un de deux poussoirs 20, 22, tandis que les deux soupapes d'échappement 11, 12 sont actionnées par un culbuteur double 15 basculant sur l'axe 19 et coopérant avec un poussoir 21. Les trois poussoirs 20, 21, 22, alignés au droit du plan PP, coulissent dans une barrette 29 constituant le guide précité et faisant corps avec les paliers 25, 26. Dans le cas d'un moteur à plusieurs cylindres alignés parallèlement à l'arbre à cames 13, cette barrette 29 se prolonge par une extrémité 29a au-delà d'au moins l'un des paliers 25, 26.The pushers 20-24 each slide in a guide 29, 30 integrally with at least one of the bearings 25 to 28. In the embodiment of Figures 1 to 3, each intake valve 9, 10 is actuated by one of two rockers 14 rocking on the axis 18 on either side of the well 4 and cooperating respectively with one of two pushers 20, 22, while the two exhaust valves 11, 12 are actuated by a double rocker arm 15 rocking on the axis 19 and cooperating with a pusher 21. The three plungers 20, 21, 22, aligned in line with the plane PP, slide in a bar 29 constituting the aforementioned guide and forming a body with the bearings 25, 26. In the case of an engine with several cylinders aligned parallel to the camshaft 13, this bar 29 is extended by one end 29a beyond at least one of the bearings 25, 26.

Dans le mode de réalisation de la Figure 4, chaque paire de soupapes 9-10, 11-12 est actionnée par l'un des deux culbuteurs doubles 16, 17 basculant respectivement sur l'un des deux axes 18, 19 et coopérant respectivement avec l'un des deux poussoirs parallèles 23, 24. Le guide 30 de chacun de ceux-ci fait corps avec un seul des paliers 27, 28, un palier tel que 28 comportant éventuellement deux guides 30, 30a pour deux poussoirs 24, 24a coopérant respectivement avec des culbuteurs associés à deux cylindres voisins. La fourche formée par le culbuteur double 16 chevauche le puits 4.In the embodiment of Figure 4, each pair of valves 9-10, 11-12 is actuated by one of the two double rocker arms 16, 17 rocking respectively on one of the two axes 18, 19 and respectively cooperating with one of the two parallel pushers 23, 24. The guide 30 of each of these forms one body with only one of the bearings 27, 28, a bearing such as 28 possibly comprising two guides 30, 30a for two pushers 24, 24a cooperating respectively with rocker arms associated with two neighboring cylinders. The fork formed by the double rocker arm 16 overlaps the well 4.

Comme on le voit sur les Figures, l'implantation du dispositif dans la culasse 1 est relativement compacte pour un moteur à quatre soupapes par cylindre et à bougie centrale, et grâce à l'emplacement des axes de culbuteurs à l'intérieur du V formé par les soupapes 9-12 et par le puits 4 de bougie, dans la partie de ce V suffisamment éloignée de la chambre de combustion 2, donc suffisamment large, l'axe situé du côté du puits 4 de bougie n'interfère pas avec celui-ci et peut par suite être porté rigidement par deux paliers. De plus, la présence des poussoirs 20-22 entre l'arbre à cames 18 et les culbuteurs 14-17 permet de loger dans cet espace en V un dispositif de rattrapage automatique du jeu de fonctionnement des soupapes en incorporant dans chaque poussoir un moyen d'amortissement hydraulique télescopique connu.As seen in the Figures, the installation of the device in the cylinder head 1 is relatively compact for an engine with four valves per cylinder and with central spark plug, and thanks to the location of the rocker shafts inside the V formed by the valves 9-12 and by the spark plug well 4, in the part of this V sufficiently distant from the combustion chamber 2, therefore sufficiently wide, the axis located on the side of the spark plug well 4 does not interfere with that -this and can therefore be carried rigidly by two bearings. In addition, the presence of the pushers 20-22 between the camshaft 18 and the rocker arms 14-17 makes it possible to accommodate in this V-shaped space an automatic device for adjusting the operating clearance of the valves by incorporating in each pushrod a means of 'known telescopic hydraulic damping.

Claims (5)

1. A device for actuating valves in an internal combustion engine comprising four valves (9, 10, 11, 12) inclined in a V configuration and a central spark plug (3) per cylinder (6), each cylinder (6) being connected to two pairs of valves (9, 10 ; 11, 12) which are respectively inclined on each side of an axial plane (P-P) of the corresponding cylinder (6), while a spark plug pit (4) is provided between the two valves (9, 10) of one of the pairs and disposed roughly parallel to these pairs of valves, said device comprising a central camshaft (13) located in the vicinity of said axial plane (P-P) and, for each cylinder (6), at least two rockers (16, 17; 14, 15) which are more remote from the combustion chamber (2) than the camshaft (13) and which respectively rock on two pins (18, 19) parallel to the camshaft located on each side of said axial plane (P-P), characterised in that, between each rocker (14, 15 ; 16, 17) and the camshaft (13) there is interposed in known manner a pushrod (20-22; 23, 24) which is substantially parallel to the cylinder (6), and in that, for each cylinder, the rocker pin (18) disposed on the same side as the spark plug pit (4) is carried, as the other pin (19), by two bearings (25, 26 ; 27, 28) located on each side of the rockers (14, 15 ; 16, 17) and is disposed between the pit (4) and said axial plane (PP).
2. A device according to Claim 1, characterised in that the two valves (9, 10) in the vicinity of the spark plug pit (4) are respectively actuated by two rockers (14) rocking on the same pin (18) while the other pair of valves (11, 12) is actuated by a double rocker (15) rocking on the second pin (19), and the three rockers (14, 15) respectively cooperate with one of three parallel and aligned pushrods (20, 22, 21).
3. A device according to Claim 1, characterised in that each pair of valves (9, 10, 11, 12) is actuated by one of two double rockers (16, 17) rocking respectively on one of the two pins (18, 19) and each cooperating with one of two parallel pushrods (23, 24), one of the two rockers (16) being astride the spark plug pit (4).
4. A device according to one of Claims 1 to 3, characterised in that the pushrods (20, 21, 22 ; 23, 24, 24a) located in the vicinity of said axial plane (P-P) each slide in a guide (29 ; 30, 30a) which is in one piece with at least one of the two bearings (25, 26 ; 27, 28) carrying the pin (18, 19) of the corresponding rocker (14, 15 ; 16, 17).
5. A device according to one of Claims 1 to 4, characterised in that the pushrods (20-22, 23, 24, 24a) each comprise a. hydraulic clearance taking- up device.
EP86400443A 1985-03-13 1986-03-04 Valvedrive for an internal-combustion engine having four v-inclined valves and a centrally disposed spark plug Expired EP0194922B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8503709 1985-03-13
FR8503709A FR2578907B1 (en) 1985-03-13 1985-03-13 DEVICE FOR ACTUATING VALVES IN AN INTERNAL COMBUSTION ENGINE COMPRISING FOUR VALVES INCLINED IN V AND A CENTRAL SPARK PLUG BY CYLINDER

Publications (2)

Publication Number Publication Date
EP0194922A1 EP0194922A1 (en) 1986-09-17
EP0194922B1 true EP0194922B1 (en) 1988-06-15

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EP86400443A Expired EP0194922B1 (en) 1985-03-13 1986-03-04 Valvedrive for an internal-combustion engine having four v-inclined valves and a centrally disposed spark plug

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US (1) US4671222A (en)
EP (1) EP0194922B1 (en)
JP (1) JPS61210207A (en)
DE (1) DE3660315D1 (en)
FR (1) FR2578907B1 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61275545A (en) * 1985-05-29 1986-12-05 Daihatsu Motor Co Ltd Tappet valve device in internal combustion engine
JPH0668256B2 (en) * 1986-07-09 1994-08-31 本田技研工業株式会社 SOHC internal combustion engine
JPH0668254B2 (en) * 1986-07-09 1994-08-31 本田技研工業株式会社 SOHC internal combustion engine
US4741301A (en) * 1986-11-28 1988-05-03 General Motors Corporation Engine valve train with inner and outer cam followers
JP2694899B2 (en) * 1988-05-30 1997-12-24 ヤマハ発動機株式会社 Valve system for 4-cycle engine
US5070824A (en) * 1988-05-30 1991-12-10 Yamaha Hatsudoki Kabushiki Kaisha Combustion chamber and valve operating mechanism for multi-valve engine
JPH02149769A (en) * 1988-11-30 1990-06-08 Fuji Heavy Ind Ltd Ignition plug arrangement device of four valve type engine combustion chamber
JP2741691B2 (en) * 1989-04-28 1998-04-22 スズキ株式会社 Valve train of internal combustion engine
FR2662471B1 (en) * 1990-05-23 1992-09-25 Peugeot METHOD FOR PRODUCING SPARK PLUG WELLS IN A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE AND SET OF ELEMENTS FOR FORMING AT LEAST SUCH A SPARK PLUG WELL.
DE69005276T2 (en) * 1989-12-15 1994-07-21 Citroen Sa(Automobiles) Method for producing a spark plug opening in a cylinder head of an internal combustion engine.
JPH0811930B2 (en) * 1990-04-13 1996-02-07 本田技研工業株式会社 SOHC type multi-cylinder internal combustion engine
JP2849939B2 (en) * 1990-05-07 1999-01-27 本田技研工業株式会社 SOHC type internal combustion engine
US5445118A (en) * 1994-04-22 1995-08-29 Brunswick Corporation Valve train assembly for internal combustion engine
US5560331A (en) * 1994-05-10 1996-10-01 Yamaha Hatsudoki Kabushiki Kaisha Cylinder head for engine
US5636600A (en) * 1995-10-31 1997-06-10 Cummins Engine Company, Inc. Rocker lever assembly for internal combustion engine
AT410242B (en) * 1997-04-09 2003-03-25 Avl List Gmbh MULTI-CYLINDER INTERNAL COMBUSTION ENGINE WITH TWO INLET AND TWO EXHAUST VALVES
DE19745715A1 (en) * 1997-10-16 1999-04-22 Daimler Chrysler Ag Variable control of valves of internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2016084A (en) * 1978-03-03 1979-09-19 Daimler Benz Ag Cylinder head for a micture-compressing internalcombustion engine
EP0141527A2 (en) * 1983-10-22 1985-05-15 Gaydon Technology Limited Cylinder head for spark ignition internal combustion engine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1382953A (en) * 1921-06-28 church
FR504380A (en) * 1918-05-16 1920-07-02 Rolls Royce Improvements to valve mechanisms for internal combustion engines
US1500619A (en) * 1920-01-22 1924-07-08 Packard Motor Car Co Hydrocarbon motor
US1406271A (en) * 1921-01-17 1922-02-14 Henry C Michelsen Internal-combustion engine
US2944536A (en) * 1958-05-30 1960-07-12 Austin Motor Co Ltd Overhead valve internal combustion engines
US3045657A (en) * 1959-07-22 1962-07-24 Thompson Ramo Wooldridge Inc Valve operating means
FR1535881A (en) * 1967-08-18 1968-08-09 Daimler Benz Ag Distribution for internal combustion piston engine
US3661127A (en) * 1970-05-07 1972-05-09 Johnson Products Inc Hydraulic tappet with swivelably mounted pushrod
JPS5543228A (en) * 1978-09-21 1980-03-27 Yamaha Motor Co Ltd Overhead cam-shaft engine
US4505236A (en) * 1982-06-01 1985-03-19 Nissan Motor Company, Limited Valve operating arrangement of an internal combustion engine
US4556025A (en) * 1983-11-18 1985-12-03 Mazda Motor Corporation Engine valve mechanism having valve disabling device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2016084A (en) * 1978-03-03 1979-09-19 Daimler Benz Ag Cylinder head for a micture-compressing internalcombustion engine
EP0141527A2 (en) * 1983-10-22 1985-05-15 Gaydon Technology Limited Cylinder head for spark ignition internal combustion engine

Also Published As

Publication number Publication date
US4671222A (en) 1987-06-09
FR2578907B1 (en) 1989-06-16
FR2578907A1 (en) 1986-09-19
JPS61210207A (en) 1986-09-18
DE3660315D1 (en) 1988-07-21
EP0194922A1 (en) 1986-09-17

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