EP0194922A1 - 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
EP0194922A1
EP0194922A1 EP86400443A EP86400443A EP0194922A1 EP 0194922 A1 EP0194922 A1 EP 0194922A1 EP 86400443 A EP86400443 A EP 86400443A EP 86400443 A EP86400443 A EP 86400443A EP 0194922 A1 EP0194922 A1 EP 0194922A1
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EP
European Patent Office
Prior art keywords
valves
cylinder
spark plug
well
axis
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
EP86400443A
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German (de)
French (fr)
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EP0194922B1 (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
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Publication date
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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.
  • the object of the invention is to produce, in an engine with four inclined V-shaped valves and a central spark plug per cylinder, a relatively compact and particularly reliable valve actuation device, possibly fitted with a play take-up means. 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 dis posed in V, c ' 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 inlet valves 9, 10 and roughly parallel thereto.
  • 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, 1 7 each carried by 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, 2 4 parallel to the cylinder 6 and aligned in the vicinity of the PP plane.
  • 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 Mon of two rocker arms 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 to the right of the plane PP slide in a bar 29 constituting the aforementioned guide and being integral with the bearings 25, 26. In 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 two double rocker arms 16, 17 rocking respectively on one of the two axes 18, 19 and cooperating respectively 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 1 6 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 axes of cubulters 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 situated on the side of the spark plug well 4 does not interfere with this ci and can therefore be rigidly carried 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)

Abstract

Dispositif d'actionnement de soupapes, dans un moteur à combustion interne comportant quatre soupapes (9, 10, 11, 12) inclinées en V et une bougie centrale (3) par cylindre (6), chaque cylindre (6) étant associé à deux paires de soupapes (9, 10; 11, 12) inclinées de part et d'autre d'un plan axial (P-P) du cylindre (6), tandis qu'un puits (4) de bougie est ménagé entre les deux soupapes (9, 10) de l'une des paires, à peu près parallèlement à celles-ci, ce dispositif comprenant un arbre à cames central (13) situé au voisinage dudit plan axial (P-P) et, pour chaque cylindre (6), au moins deux culbuteurs (14, 15); entre chaque culbuteur (14, 15) et l'arbre à cames (13) est interposé un poussoir (21) parallèle au cylindre (6), et pour chaque cylindre l'axe (18) de culbuteur (s) disposé du même côté que le puits (4) est porté, comme l'autre axe (19), par deux paliers (26) situés de part et d'autre des culbuteurs (14, 15) et est disposé entre le puits (4) et ledit plan axial (P-P). Ce dispositif est peu encombrant et particulièrement fiable.Valve actuation device in an internal combustion engine comprising four valves (9, 10, 11, 12) inclined in a V and a central spark plug (3) per cylinder (6), each cylinder (6) being associated with two pairs of valves (9, 10; 11, 12) inclined on either side of an axial plane (PP) of the cylinder (6), while a spark plug well (4) is formed between the two valves ( 9, 10) of one of the pairs, roughly parallel to these, this device comprising a central camshaft (13) located in the vicinity of said axial plane (PP) and, for each cylinder (6), at at least two rocker arms (14, 15); between each rocker arm (14, 15) and the camshaft (13) is interposed a pusher (21) parallel to the cylinder (6), and for each cylinder the axis (18) of rocker arm (s) arranged on the same side that the well (4) is carried, like the other axis (19), by two bearings (26) located on either side of the rocker arms (14, 15) and is disposed between the well (4) and said plane axial (PP). This device is compact and particularly reliable.

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, cette implantation est rendue possible en articulant les deux culbuteurs en question, de part et d'autre de 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 lessdits axe et tige, ce qui accroît la masse, l'encombrement et le prix de la culasse.In a known arrangement, 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.

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 particu lièrement fiable, éventuellement équipé d'un moyen de rattrapage de jeu atténuant son bruit de fonctionnementThe object of the invention is to produce, in an engine with four inclined V-shaped valves and a central spark plug per cylinder, a relatively compact and particularly reliable valve actuation device, possibly fitted with a play take-up means. 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.

Selon d'autres carcatéristiques avantageuses de fin- vention :According to other advantageous finishing characteristics:

  • -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 cubluteur double basculant sur le deuxième axe, et les trois culbuteurs coopèrent respectivement avec l'un de trois poussoirs parallèles et afignés;-the two valves adjacent to the spark plug well are actuated respectively by two rockers rocking on the same axis, while the other pair of valves is actuated by a double rocker rocking on the second axis, and the three rockers cooperate respectively with the one of three parallel and narrow pushers;
  • -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;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;
  • -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;the pushers, located in the vicinity of said axial plane, each slide in a guide formed integrally with at least one of the two bearings carrying the axis of the corresponding rocker arm;
  • -les poussoirs comportent chacun un dispositif hydraulique de rattrapage de jeu.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:
  • FIG. 1 is a side elevation view of a first embodiment of the actuation device according to the invention;
  • FIG. 2 is a top view of the device of FIG. 1, an upper part being removed;
  • FIG 3 is a partial sectional view along line III-III of Figure 1;
  • FIG. 4 is a view, similar to that of FIG. 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 dis posées 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 dis posed in V, c ' 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 inlet valves 9, 10 and roughly parallel thereto.

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, 1 7 each carried by 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, 2 4 parallel to the cylinder 6 and aligned in the vicinity of the PP plane. 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 de 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 Mon of two rocker arms 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 to the right of the plane PP, slide in a bar 29 constituting the aforementioned guide and being integral with the bearings 25, 26. In 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 de 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 two double rocker arms 16, 17 rocking respectively on one of the two axes 18, 19 and cooperating respectively 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 1 6 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 cubulteurs à l'intéreur 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 de 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 can be 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 axes of cubulters 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 situated on the side of the spark plug well 4 does not interfere with this ci and can therefore be rigidly carried 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 -Dispositif d'actionnement de soupapes, dans un moteur à combustion interne comportant quatre soupapes (9, 10, 11, 12) inclinées en V et une bougie centrale (3) par cylindre (6), chaque cylindre (6) étant associé à deux paires de soupapes (9, 10; 11, 12) respectivement inclinées de part et d'autre d'un plan axial (P-P) du cylindre (6) correspondant, tandis qu'un puits (4) de bougie est ménagé entre les deux soupapes (9, 10) de l'une des paires, à peu près parallèlement à celles-ci, ce dispositif comprenant un arbre à cames central (13) situé au voisinage dudit plan axial (P-P) et, pour chaque cylindre (6), au moins deux culbuteurs (16, 17; 14, 15) qui sont plus éloignés de la chambre de combustion (2) que l'arbre à cames (13) et qui basculent respectivement sur deux axes (18, 19) parallèles à l'arbre à cames situés de part et d'autre dudit plan axial (P-P), caractérisé en ce qu'entre chaque culbuteur (14, 15; 16, 17) et l'arbre à cames (13) est interposé comme connu en soi, un poussoir (20-22; 23, 24) sensiblement parallèle au cylindre (6), et en ce que, pour chaque cylindre, l'axe - (18) de culbuteur(s) disposé du même côté que le puits - (4) de bougie est porté, comme l'autre axe (19), par deux paliers (25, 26; 27,. 28) situés de part et d'autre des culbuteurs (14, 15; 16, 17) et est disposé entre le puits (4) et ledit plan axial (P-P). 1 - Valve actuation device, in an internal combustion engine comprising four valves (9, 10, 11, 12) inclined in V and a central spark plug (3) per cylinder (6), each cylinder (6) being associated with two pairs of valves (9, 10; 11, 12) respectively inclined on either side of an axial plane (PP) of the corresponding cylinder (6), while a spark plug well (4) is formed between the two valves (9, 10) of one of the pairs, roughly parallel to these, this device comprising a central camshaft (13) located in the vicinity of said axial plane (PP) and, for each cylinder ( 6), at least two rocker arms (16, 17; 14, 15) which are further from the combustion chamber (2) than the camshaft (13) and which rock respectively on two parallel axes (18, 19) to the camshaft located on either side of said axial plane (PP), characterized in that between each rocker arm (14, 15; 16, 17) and the camshaft (13) is interposed as known in itself, a pusher (20-22; 23, 24) substantially parallel to the cylinder (6), and in that, for each cylinder, the axis - (18) of rocker arm (s) disposed on the same side as the well - (4) of the spark plug is carried, as the other axis (19), by two bearings (25, 26; 27,. 28) located on either side of the rocker arms (14, 15; 16, 17) and is disposed between the well (4) and said axial plane (PP). 2 -Dispositif selon la revendication 1, caractérisé en ce que les deux soupapes (9, 10) voisines du puits (4) de bougie sont actionnées respectivement par deux culbuteurs (14) basculant sur le même axe (18), tandis que l'autre paire de soupapes (11, 12) est actionnée par un culbuteur double - (15) basculant sur le deuxième axe (19), et les trois culbuteurs (14, 15) coopèrent respectivement avec l'un de trois poussoirs (20, 22, 21) parallèles et alignés.2 -A device according to claim 1, characterized in that the two valves (9, 10) adjacent to the well (4) of the spark plug are actuated respectively by two rocker arms (14) rocking on the same axis (18), while the another pair of valves (11, 12) is actuated by a double rocker arm (15) rocking on the second axis (19), and the three rocker arms (14, 15) cooperate respectively with one of three pushers (20, 22 , 21) parallel and aligned. 3 -Dispositif selon la revendication 1, caractérisé en ce que chaque paire de soupapes (9, 10, 11, 12) est actionnée par l'un de deux culbuteurs doubles (16, 17) basculant respectivement sur l'un des deux axes (18, 19) et coopérant chacun avec l'un de deux poussoirs parallèles (23, 24), l'un des deux culbuteurs (16) chevauchant le puits (4) de bougie.3 -A device according to claim 1, characterized in that each pair of valves (9, 10, 11, 12) is actuated by one of two double rocker arms (16, 17) rocking respectively on one of the two axes ( 18, 19) and each cooperating with one of two parallel pushers (23, 24), one of the two rockers (16) straddling the spark plug well (4). 4 -Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que les poussoirs (20, 21, 22; 23, 24, 24a) situés au voisinage dudit plan axial (P-P), coulissent chacun dans un guide (29; 30, 30a) venu de matière avec au moins l'un des deux paliers (25, 26; 27, 28) portant l'axe - (18, 19) du culbuteur correspondant (14, 15; 16, 17).4 -A device according to one of claims 1 to 3, characterized in that the pushers (20, 21, 22; 23, 24, 24a) located in the vicinity of said axial plane (PP), each slide in a guide (29; 30, 30a) integral with at least one of the two bearings (25, 26; 27, 28) carrying the axis - (18, 19) of the corresponding rocker arm (14, 15; 16, 17). 5 -Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les poussoirs (20-22, 23, 24, 24a) comportent chacun un dispositif hydraulique de rattrapage de jeu.5 -Device according to one of claims 1 to 4, characterized in that the pushers (20-22, 23, 24, 24a) each include a hydraulic play take-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
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
FR8503709 1985-03-13

Publications (2)

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EP0194922A1 true EP0194922A1 (en) 1986-09-17
EP0194922B1 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)

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EP0433125A1 (en) * 1989-12-15 1991-06-19 Automobiles Peugeot Method for producing a sparkplug well in the cylinder head of an internal combustion engine
FR2662471A1 (en) * 1990-05-23 1991-11-29 Peugeot Method for making spark plug wells in a cylinder head of an internal combustion engine, and set of elements intended to form at least one such spark plug well
WO1998045579A1 (en) * 1997-04-09 1998-10-15 Deutz Aktiengesellschaft Multicylinder internal combustion engine with two inlet valves and two outlet valves
DE19745715A1 (en) * 1997-10-16 1999-04-22 Daimler Chrysler Ag Variable control of valves of internal combustion engine

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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
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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
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP0433125A1 (en) * 1989-12-15 1991-06-19 Automobiles Peugeot Method for producing a sparkplug well in the cylinder head of an internal combustion engine
FR2662471A1 (en) * 1990-05-23 1991-11-29 Peugeot Method for making spark plug wells in a cylinder head of an internal combustion engine, and set of elements intended to form at least one such spark plug well
WO1998045579A1 (en) * 1997-04-09 1998-10-15 Deutz Aktiengesellschaft Multicylinder internal combustion engine with two inlet valves and two outlet valves
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DE19745715A1 (en) * 1997-10-16 1999-04-22 Daimler Chrysler Ag Variable control of valves of internal combustion engine

Also Published As

Publication number Publication date
DE3660315D1 (en) 1988-07-21
JPS61210207A (en) 1986-09-18
EP0194922B1 (en) 1988-06-15
FR2578907A1 (en) 1986-09-19
FR2578907B1 (en) 1989-06-16
US4671222A (en) 1987-06-09

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