EP0209426B1 - Cylinder head of an internal-combustion engine with three valves per cylinder - Google Patents

Cylinder head of an internal-combustion engine with three valves per cylinder Download PDF

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Publication number
EP0209426B1
EP0209426B1 EP19860401325 EP86401325A EP0209426B1 EP 0209426 B1 EP0209426 B1 EP 0209426B1 EP 19860401325 EP19860401325 EP 19860401325 EP 86401325 A EP86401325 A EP 86401325A EP 0209426 B1 EP0209426 B1 EP 0209426B1
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EP
European Patent Office
Prior art keywords
intake
cylinder head
valve
valves
exhaust
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
EP19860401325
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German (de)
French (fr)
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EP0209426A1 (en
Inventor
Gabriel Laine
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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Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0209426A1 publication Critical patent/EP0209426A1/en
Application granted granted Critical
Publication of EP0209426B1 publication Critical patent/EP0209426B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • 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
    • 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
    • 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
    • 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
    • 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
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to a cylinder head of an internal combustion engine with positive ignition, comprising, as described by FR-A-2 048182, combustion chambers associated with corresponding cylinders of the engine and in which each combustion chamber is provided two intake valves and one exhaust valve suitable for closing two intake pipes and one exhaust pipe opening respectively in two opposite lateral faces of the cylinder head, and in each combustion chamber the exhaust valve and a first inlet valve are arranged on the side of the side face where the exhaust duct opens.
  • the presence of two intake valves per combustion chamber makes it possible not only to provide a relatively large passage section for the intake gases, and consequently to obtain a large engine power, but also to provide a variable supply. optimized by introducing intake gases alternately by a single valve at low speeds and / or at low engine loads, or by the two valves at high speeds and / or at heavy loads.
  • the two intake valves of each combustion chamber are juxtaposed, generally on the side of the side face where the intake ducts open, and on the opposite side are arranged the exhaust valve and a spark plug.
  • the internal end of the latter provided with electrodes causing the ignition of the mixture introduced into the chamber, is consequently notably spaced from the center of the chamber, close to the exhaust valve, and relatively far from one of the two intake valves. This often results in incomplete combustion of the mixture and a strong knocking tendency, which results in defective engine performance and excessive deterioration of its moving equipment.
  • DE-A-3 033 072 relates to diesel engines, therefore with self-ignition, and not with spark-ignition engines.
  • the diametrically opposite position of the intake valves aims, in association with the highly curved conduits in top view, to perfect the swirl of air, desirable in a diesel engine.
  • the location of the injector in the middle of the flat combustion chamber aims to concentrate the jet of fuel in a central recess of the piston.
  • GB-A-967 697 shows valves of a cylinder head driven by an overhead camshaft, via two respective pushers for a first and a second valve, and via a rocker arm for a third valve.
  • the object of the invention is to produce a cylinder head of the aforementioned type, with three valves per cylinder, providing the engine with good efficiency and a minimal knocking tendency.
  • the two intake valves are approximately diametrically opposite, and the internal end of the spark plug is located between the two intake valves, on the side opposite the exhaust valve and near the center. from the chamber, and the spark plug is screwed into the lateral face where the intake ducts open, and it is disposed, in an inclined position, under the duct associated with the first intake valve.
  • valves are driven by an overhead camshaft, via two respective pushers for the exhaust valve and for the first intake valve, and via a rocker arm for the other intake valve.
  • a cylinder head 1 of an internal combustion engine intended to cover by its underside 2 a cylinder block delimiting with pistons several combustion chambers 3.
  • each chamber 3 open two intake ducts 4 , and an exhaust duct 6 which can be closed off respectively with intake rod 7, 8 or exhaust valve 9 (hidden by the valve 7 in FIG. 1).
  • the intake ducts 4, 5 open into a first lateral face 10 of the cylinder head 1, and the exhaust duct 6 opens into the opposite side 11, communicating respectively with pipes admission 12 and exhaust 13.
  • the conduits 4 and 5 are separated up to the face 10 and the tube 12 has two orifices to the right of this face.
  • the conduits 4 and 5 meet before opening onto the face 10, and the tube 12 then has a single orifice at the right of this face.
  • the intake valve 7 and the exhaust valve 9 are substantially perpendicular to the face 2 and located, above the chamber 3, on the side of the side face 11 and each cooperate with one of two parallel pushers 14 , 15 actuated respectively by a cam 16 and a cam 17 integral with a shaft 18 carried by the cylinder head 1 parallel to the faces 2, 10 and 11.
  • the intake valve 8 is significantly inclined with respect to the other two valves 7, 9 and is located, above the chamber 3, on the side of the side face 10, or it cooperates with a rocker arm oscillating on an axis 20 and actuated by a cam 21 of the shaft 18.
  • This axis 20 is carried by several bearing caps 22 which hold the shaft 18 on transverse partitions 23 of the cylinder head 1.
  • Each valve is conventionally returned to its seat by a spring such as those 24 and 25 corresponding to valves 7 and 8.
  • a cylinder head cover 26 covers the cylinder head 1 so as to protect the shaft 18 and its bearings 22, the rocker arms 19 and their axis 20 as well as the pushers 14, 15 and the springs. This cylinder head cover is removed from Figure 2 to clarify the drawing.
  • the camshaft 18 and the rocker shafts being located relatively high, above the valves 7, 9 and their pushers 14, 15, the intake ducts 4 and 5 have large radii of curvature - for example greater at 3 cm - and open high enough on the face 10 to make room for a spark plug 30 screwed into the cylinder head 1 on the side of this face, near the valve 8 and below the intake duct 4.
  • the spark plug is relatively slightly inclined relative to the face 2 of the cylinder head 1 and, according to a feature of the invention, its internal end 30a provided with electrodes is located, in the chamber 3, near the center of the latter , on the side opposite to the exhaust valve 9 and between the two intake valves 7, 8, which are approximately diametrically opposite.
  • the intake ducts 4 and 5 have good permeability, that is to say a low resistance to flow for the gases which pass there, which optimizes the supply of the chamber. 3, in particular for the high engine operating speeds.

Description

L'invention est relative à une culasse de moteur à combustion interne à allumage commandé, comportant, comme décrit par le FR-A-2 048182, des chambres de combustion associées à des cylindres correspondants du moteur et dans laquelle chaque chambre de combustion est pourvue de deux soupapes d'admission et d'une soupape d'échappement propres à obturer deux conduits d'admission et un conduit d'échappement débouchant respectivement dans deux faces latérales opposées de la culasse, et dans chaque chambre de combustion la soupape d'échappement et une première soupape d'admission sont disposées du côté de la face latérale où débouche le conduit d'échappement.The invention relates to a cylinder head of an internal combustion engine with positive ignition, comprising, as described by FR-A-2 048182, combustion chambers associated with corresponding cylinders of the engine and in which each combustion chamber is provided two intake valves and one exhaust valve suitable for closing two intake pipes and one exhaust pipe opening respectively in two opposite lateral faces of the cylinder head, and in each combustion chamber the exhaust valve and a first inlet valve are arranged on the side of the side face where the exhaust duct opens.

La présence de deux soupapes d'admission par chambre de combustion permet, non seulement de procurer une relativement grande section de passage pour les gaz d'admission, et par suite d'obtenir une importante puissance du moteur, mais aussi de prévoir une alimentation variable optimisée par introduction des gaz d'admission alternativement par une seule soupape aux basses vitesses et/ou aux faibles charges du moteur, ou par les deux soupapes aux hautes vitesses et/ou aux fortes charges.The presence of two intake valves per combustion chamber makes it possible not only to provide a relatively large passage section for the intake gases, and consequently to obtain a large engine power, but also to provide a variable supply. optimized by introducing intake gases alternately by a single valve at low speeds and / or at low engine loads, or by the two valves at high speeds and / or at heavy loads.

Dans les culasses usuelles de ce type, les deux soupapes d'admission de chaque chambre de combustion sont juxtaposées, généralement du côté de la face latérale où débouchent les conduits d'admission, et du côté opposé sont disposées la soupape d'échappement et une bougie d'allumage. L'extrémité interne de celle-ci, munie d'électrodes provoquant l'inflammation du mélange introduit dans la chambre, est par suite notablement écartée du centre de la chambre, proche de la soupape d'échappement, et relativement éloignee de l'une des deux soupapes d'admission. Il en résulte souvent une incomplète combustion du mélange et une forte tendance au cliquetis, ce qui se traduit par un rendement défectueux du moteur et une détérioration excessive de son équipage mobile.In the usual cylinder heads of this type, the two intake valves of each combustion chamber are juxtaposed, generally on the side of the side face where the intake ducts open, and on the opposite side are arranged the exhaust valve and a spark plug. The internal end of the latter, provided with electrodes causing the ignition of the mixture introduced into the chamber, is consequently notably spaced from the center of the chamber, close to the exhaust valve, and relatively far from one of the two intake valves. This often results in incomplete combustion of the mixture and a strong knocking tendency, which results in defective engine performance and excessive deterioration of its moving equipment.

Le DE-A-3 033 072 a trait à des moteurs Diesel, donc à auto-allumage, et non à des moteurs à allumage commandé. Sur la Fig. 8 de ce document antérieur, la position diamétralement opposée des soupapes d'admission vise, en association avec les conduits très incurvés en vue de dessus, à parfaire le tourbillonnement d'air, souhaitable dans un moteur Diesel. De plus l'emplacement de l'injecteur au milieu de la chambre de combustion plate vise à concentrer le jet de carburant dans un évidement central du piston.DE-A-3 033 072 relates to diesel engines, therefore with self-ignition, and not with spark-ignition engines. In Fig. 8 of this prior document, the diametrically opposite position of the intake valves aims, in association with the highly curved conduits in top view, to perfect the swirl of air, desirable in a diesel engine. In addition, the location of the injector in the middle of the flat combustion chamber aims to concentrate the jet of fuel in a central recess of the piston.

Les enseignements des deux documents antérieurs précités ne peuvent être valablement combinés. En effet, on ne peut passer des moteurs Diesel aux moteurs à allumage commandé simplement en remplaçant les injecteurs de carburant par des bougies.The lessons of the two aforementioned previous documents cannot be validly combined. Indeed, one cannot switch from diesel engines to spark ignition engines simply by replacing the fuel injectors with spark plugs.

En outre, dans la configuration générale de la culasse du brevet FR-A-2 048102, où les soupapes forment un V de part et d'autre d'un arbre à cames, il serait très difficile d'agencer l'un des deux conduits d'admission, selon le brevet DE-A-3 033 072, de manière qu'il traverse le plan de symétrie du moteur, notamment en raison de l'inclinaison de la soupape associée à ce conduit vers le côté opposé à la face d'entrée de ce dernier, qui se trouverait alors très incurvé, donc de mauvaise "perméabilité".In addition, in the general configuration of the cylinder head of patent FR-A-2 048102, where the valves form a V on either side of a camshaft, it would be very difficult to arrange one of the two intake ducts, according to patent DE-A-3,033,072, so that it crosses the plane of symmetry of the engine, in particular because of the inclination of the valve associated with this duct towards the side opposite to the face entry of the latter, which would then be very curved, therefore of poor "permeability".

Le GB-A-967 697 montre des soupapes d'une culasse entraînées par un arbre à cames en tête, par l'intermédiaire de deux poussoirs respectifs pour une première et une deuxième soupapes, et par l'intermédiaire d'un culbuteur pour une troisième soupape.GB-A-967 697 shows valves of a cylinder head driven by an overhead camshaft, via two respective pushers for a first and a second valve, and via a rocker arm for a third valve.

L'invention a pour but de réaliser une culas se du type susmentionné, avec trois soupapes par cylindre, procurant au moteur un bon rendement et une tendance au cliquetis minimale.The object of the invention is to produce a cylinder head of the aforementioned type, with three valves per cylinder, providing the engine with good efficiency and a minimal knocking tendency.

Selon l'invention, les deux soupapes d'admission sont à peu près diamétralement opposées, et l'extrémité interne de la bougie est située entre les deux soupapes d'admission, du côté opposé à la soupape d'échappement et à proximité du centre de la la chambre, et la bougie est vissée dans la face latérale où débouchent les conduits d'admission, et elle est disposée, en position inclinée, sous le conduit associé à la première soupape d'admission.According to the invention, the two intake valves are approximately diametrically opposite, and the internal end of the spark plug is located between the two intake valves, on the side opposite the exhaust valve and near the center. from the chamber, and the spark plug is screwed into the lateral face where the intake ducts open, and it is disposed, in an inclined position, under the duct associated with the first intake valve.

Selon une autre particularité avantageuse de l'invention, les soupapes sont entraînées par un arbre à cames en tête, par l'intermédiaire de deux poussoirs respectifs pour la soupape d'échappement et pour la première soupape d'admission, et par l'intermédiaire d'un culbuteur pour l'autre soupape d'admission.According to another advantageous feature of the invention, the valves are driven by an overhead camshaft, via two respective pushers for the exhaust valve and for the first intake valve, and via a rocker arm for the other intake valve.

Un exemple non limitatif de réalisation d'une culasse selon l'invention est décrit ci-après, avec référence aux dessins annexés, sur lesquels :

  • - la Figure 1 est une vue en élévation et en coupe suivant le ligne 1 - I de la Figure 2 d'une culasse de moteur à combustion interne selon l'invention;
  • - la Figure 2 est une vue de dessus sans couvre-culasse de la culasse de la Figure 1;
  • - et la Figure 3 est une vue partielle de dessous de la culasse des Figures 1 et 2.
A nonlimiting example of embodiment of a cylinder head according to the invention is described below, with reference to the appended drawings, in which:
  • - Figure 1 is an elevational and sectional view along line 1 - I of Figure 2 of an internal combustion engine cylinder head according to the invention;
  • - Figure 2 is a top view without cylinder head cover of the cylinder head of Figure 1;
  • - And Figure 3 is a partial view from below of the cylinder head of Figures 1 and 2.

On voit sur les Figures une culasse 1 d'un moteur à combustion interne, destinée à recouvrir par sa face inférieure 2 un bloc- cylindres en délimitant avec des pistons plusieurs chambres de combustion 3. Dans chaque chambre 3 débouchent deux conduits d'admission 4, et un conduit d'échappement 6 obturables respectivement par des soupapes à tige d'admission 7, 8 ou d'échappement 9 (cachée par la soupape 7 à la Figure 1).We see in the Figures a cylinder head 1 of an internal combustion engine, intended to cover by its underside 2 a cylinder block delimiting with pistons several combustion chambers 3. In each chamber 3 open two intake ducts 4 , and an exhaust duct 6 which can be closed off respectively with intake rod 7, 8 or exhaust valve 9 (hidden by the valve 7 in FIG. 1).

A leur extrémité opposée à la chambre 3, les, conduits d'admission 4, 5 débouchent dans une première face latérale 10 de la culasse 1, et le conduit d'échappement 6 débouche dans la face opposée 11, en communiquant respectivement avec des tubulures d'admission 12 et d'échappement 13. Dans le mode de réalisation représente, les conduits 4 et 5 sont séparés jusqu'à la face 10 et la tubulure 12 présente deux orifices au droit de cette face. En variante, les conduits 4 et 5 se rejoignent avant de déboucher sur la face 10, et la tubulure 12 présente alors un seul orifice au droit de cette face.At their end opposite to the chamber 3, the intake ducts 4, 5 open into a first lateral face 10 of the cylinder head 1, and the exhaust duct 6 opens into the opposite side 11, communicating respectively with pipes admission 12 and exhaust 13. In the embodiment shown, the conduits 4 and 5 are separated up to the face 10 and the tube 12 has two orifices to the right of this face. As a variant, the conduits 4 and 5 meet before opening onto the face 10, and the tube 12 then has a single orifice at the right of this face.

La soupape d'admission 7 et la soupape d'échappement 9 sont sensiblement perpendiculaires à la face 2 et situées, au-dessus de la chambre 3, du côté de la face latérale 11 et coopèrent chacune avec l'un de deux poussoirs parallèles 14,15 actionnés respectivement par une came 16 et une came 17 solidaires d'un arbre 18 porté par la culasse 1 parallèlement aux faces 2, 10 et 11.The intake valve 7 and the exhaust valve 9 are substantially perpendicular to the face 2 and located, above the chamber 3, on the side of the side face 11 and each cooperate with one of two parallel pushers 14 , 15 actuated respectively by a cam 16 and a cam 17 integral with a shaft 18 carried by the cylinder head 1 parallel to the faces 2, 10 and 11.

La soupape d'admission 8 est notablement inclinée par rapport aux deux autres soupapes 7, 9 et est située, au-dessus de la chambre 3, du côte de la face latérale 10, ou elle coopère avec un culbuteur 19 oscillant sur un axe 20 et actionné par une came 21 de l'arbre 18. Cet axe 20 est porté par plusieurs chapeaux de paliers 22 qui maintiennent l'arbre 18 sur des cloisons transversales 23 de la culasse 1.The intake valve 8 is significantly inclined with respect to the other two valves 7, 9 and is located, above the chamber 3, on the side of the side face 10, or it cooperates with a rocker arm oscillating on an axis 20 and actuated by a cam 21 of the shaft 18. This axis 20 is carried by several bearing caps 22 which hold the shaft 18 on transverse partitions 23 of the cylinder head 1.

Chaque soupape est classiquement rappelée sur son siège par un ressort tel que ceux 24 et 25 correspondant aux soupapes 7 et 8.Each valve is conventionally returned to its seat by a spring such as those 24 and 25 corresponding to valves 7 and 8.

Un couvre-culasse 26 coiffe la culasse 1 de manière à protéger l'arbre 18 et ses paliers 22, les culbuteurs 19 et leur axe 20 ainsi que les poussoirs 14,15 et les ressorts. Ce couvre-culasse est retiré de la Figure 2 pour clarifier le dessin.A cylinder head cover 26 covers the cylinder head 1 so as to protect the shaft 18 and its bearings 22, the rocker arms 19 and their axis 20 as well as the pushers 14, 15 and the springs. This cylinder head cover is removed from Figure 2 to clarify the drawing.

L'arbre à cames 18 et les axes de culbuteurs étant situés relativement haut, au-dessus des soupapes 7, 9 et de leurs poussoirs 14, 15, les conduits 4 et 5 d'admission présentent de grands rayons de courbure - par exemple supérieurs à 3 cm - et débouchent suffisamment haut sur la face 10 pour laisser place à une bougie d'allumage 30 vissée dans la culasse 1 du côté de cette face, près de la soupape 8 et au-dessous du conduit d'admission 4.The camshaft 18 and the rocker shafts being located relatively high, above the valves 7, 9 and their pushers 14, 15, the intake ducts 4 and 5 have large radii of curvature - for example greater at 3 cm - and open high enough on the face 10 to make room for a spark plug 30 screwed into the cylinder head 1 on the side of this face, near the valve 8 and below the intake duct 4.

La bougie est relativement peu inclinée par rapport à la face 2 de la culasse 1 et, selon une particularité de l'invention, son extrémité interne 30a munie d'électrodes est située, dans la chambre 3, à proximité du centre de celle-ci, du côté opposé à la soupape 9 d'échappement et entre les deux soupapes 7, 8 d'admission, qui sont à peu près diamétralement opposées.The spark plug is relatively slightly inclined relative to the face 2 of the cylinder head 1 and, according to a feature of the invention, its internal end 30a provided with electrodes is located, in the chamber 3, near the center of the latter , on the side opposite to the exhaust valve 9 and between the two intake valves 7, 8, which are approximately diametrically opposite.

Il en résulte une combustion satisfaisante des mélanges gazeux produits dans la chambre 3 et une tendance minimale au cliquetis, notamment grâce à la bonne répartition des gaz admis par les deux soupapes opposées 7, et grâce à la position presque centrale de la zone d'infiammation commandée, tandis que la zone comprise entre l'extrémité interne 30a de la bougie 30 et la soupape 9 d'échappement est refroidie par les gaz admis par les deux soupapes 7,8.This results in a satisfactory combustion of the gas mixtures produced in the chamber 3 and a minimal knocking tendency, in particular thanks to the good distribution of the gases admitted by the two opposite valves 7, and thanks to the almost central position of the ignition zone. controlled, while the area between the internal end 30a of the spark plug 30 and the exhaust valve 9 is cooled by the gases admitted by the two valves 7,8.

Par ailleurs, grâce à leur grande courbure, les conduits 4 et 5 d admission présentent une bonne perméabilité c'est-à-dire une faible résistance a l'écoulement pour les gaz qui y passent, ce qui optimise l'alimentation de la chambre 3, en particulier pour les vitesses élevées de fonctionnement du moteur.Furthermore, thanks to their large curvature, the intake ducts 4 and 5 have good permeability, that is to say a low resistance to flow for the gases which pass there, which optimizes the supply of the chamber. 3, in particular for the high engine operating speeds.

Claims (2)

1. Cylinder head of a controlled-ignition internal combustion engine, comprising combustion chambers (3) associated with corresponding cylinders of the engine, and wherein each combustion chamber (3) is provided with a spark plug (30), two intake valves (7, 8) and an exhaust valve (9) adapted to seal two intake ducts (4,5) and an exhaust duct (6) which emerge, respectively, in two opposite lateral faces (10, 11) of the cylinder head (1), and in each combustion chamber (3) the exhaust valve (9) and a first intake valve (7) are arranged nearest the lateral surface (11) where the exhaust duct (6) emerges, characterised in that the two intake valves (7, 8) are substantially diametrically opposed, and the inner end (30a) of the spark plug (30) is located between the two intake valves (7, 8), on the side opposite the exhaust valve (9) and close to the center of the chamber (3), and in that the spark plug (30) is screwed into the lateral face (10) where the intake ducts (4, 5) emerge and it is arranged, in an inclined position, below the duct (4) associated with the first intake valve (7).
2. Cylinder head according to claim 1, characterised in that the valves (7, 8, 9) are driven by an overhead shaft (18) with cams (16,17), via two respective push rods (15, 14) for the exhaust valve (9) and for the first intake valve (7), and via a rocker arm (19) for the other intake valve (8).
EP19860401325 1985-07-08 1986-06-17 Cylinder head of an internal-combustion engine with three valves per cylinder Expired EP0209426B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8510424A FR2584455B1 (en) 1985-07-08 1985-07-08 INTERNAL COMBUSTION ENGINE CYLINDER HEAD WITH THREE VALVES
FR8510424 1985-07-08

Publications (2)

Publication Number Publication Date
EP0209426A1 EP0209426A1 (en) 1987-01-21
EP0209426B1 true EP0209426B1 (en) 1988-11-02

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EP19860401325 Expired EP0209426B1 (en) 1985-07-08 1986-06-17 Cylinder head of an internal-combustion engine with three valves per cylinder

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EP (1) EP0209426B1 (en)
BR (1) BR8603167A (en)
DE (1) DE3661092D1 (en)
FR (1) FR2584455B1 (en)

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Publication number Priority date Publication date Assignee Title
GB2228533A (en) * 1988-12-24 1990-08-29 Ford Motor Co I.c.engine valve gear
AT402535B (en) * 1990-02-23 1997-06-25 Avl Verbrennungskraft Messtech INTERNAL COMBUSTION ENGINE WITH AT LEAST TWO INLET VALVES PER ENGINE CYLINDER
IT1293668B1 (en) * 1997-08-01 1999-03-08 Fiat Ricerche INTERNAL COMBUSTION ENGINE WITH COMMANDED IGNITION WITH COMBUSTION CHAMBER EQUIPPED WITH THREE VALVES AND CENTRAL SPARK PLUG.
FR2769668B1 (en) * 1997-10-14 1999-12-24 Renault DIRECT IGNITION AND DIRECT INJECTION INTERNAL COMBUSTION ENGINE
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Also Published As

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DE3661092D1 (en) 1988-12-08
FR2584455B1 (en) 1989-07-28
FR2584455A1 (en) 1987-01-09
BR8603167A (en) 1987-02-24
EP0209426A1 (en) 1987-01-21

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