EP0210098B1 - Cylinder head for a fuel injection internal-combustion engine - Google Patents

Cylinder head for a fuel injection internal-combustion engine Download PDF

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Publication number
EP0210098B1
EP0210098B1 EP86401435A EP86401435A EP0210098B1 EP 0210098 B1 EP0210098 B1 EP 0210098B1 EP 86401435 A EP86401435 A EP 86401435A EP 86401435 A EP86401435 A EP 86401435A EP 0210098 B1 EP0210098 B1 EP 0210098B1
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EP
European Patent Office
Prior art keywords
cylinder head
injectors
injector
valve
head cap
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
EP86401435A
Other languages
German (de)
French (fr)
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EP0210098A1 (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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Publication date
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Publication of EP0210098A1 publication Critical patent/EP0210098A1/en
Application granted granted Critical
Publication of EP0210098B1 publication Critical patent/EP0210098B1/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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to cylinder heads which equip certain combustion engines and which comprise, associated with each combustion chamber, at least one intake duct into which opens a fuel injector.
  • Each duct being closable, to the right of the corresponding chamber, by a stem valve, the cylinder head is generally topped with a cylinder head cover covering various valve control members, and in particular a camshaft and its bearings, rockers and their axis, valve return springs, and possibly pushers.
  • the injectors each open into an intake duct slightly upstream of the associated valve.
  • each intake duct connecting the corresponding chamber to an air intake manifold joined to the cylinder head the injector is usually fixed to the latter near the manifold, which does not always allow, in particular when the duct is relatively long or curved, to obtain an optimal jet of fuel, that is to say a jet directed at the valve, and short enough to wet only a small surface of the wall of the duct.
  • the injector being in direct contact with the cylinder head, a particularly hot element of the engine, the fuel which drains there is likely to overheat, or even to evaporate during an engine stop, which causes a significant difficulty in restarting the latter.
  • the cylinder head generally carrying several injectors associated respectively with several combustion chambers and supplied by pipes comprising in particular a common supply rail, these pipes are sometimes subject to ruptures because of the vibrations of the engine to which they are subject and because of their method of attachment at points relatively distant from each other.
  • DE-A-3 037 687 describes an internal combustion engine cylinder head, comprising combustion chambers with each of which is associated with at least one intake duct into which opens a fuel injector and which is closable, in line with the corresponding chamber, by a stem valve, a cylinder head cover covering valve control members, the injectors being supplied by pipes and each opening into an intake duct slightly upstream of the associated valve.
  • FR-A-1 019 300 describes an engine with an injector which passes tightly through the cylinder head cover.
  • DE-A-2 833 659 describes an engine with injectors each opening into an intake duct which are held by the supply pipe itself fixed on the intake duct.
  • the object of the invention is to produce a cylinder head fitted with injectors which provide an optimal fuel jet and the heating of which is not excessive, their supply being ensured by reliable pipes.
  • each injector sealingly passes through the cylinder head cover and is held thereon by the supply pipe itself fixed on the cylinder head cover, and an annular spacer slightly flexible and not very conductive of heat is clamped between the cylinder head and the cylinder head cover coaxially with each injector.
  • a cylinder head 1 of an internal combustion engine intended to cover by its underside 2 a cylinder block by delimiting with pistons several combustion chambers 3.
  • each chamber 3 open two intake ducts 4 , 5 and an exhaust duct 6 which can be closed off in the usual manner respectively by intake rod 7, 8 or exhaust rod valves (not visible because hidden by the valve 7 in FIG. 1).
  • the intake ducts 4, 5 open into a first lateral face 9 of the cylinder head 1, and the exhaust duct 6 opens into the opposite side 10, communicating respectively with intake 11 and exhaust 12.
  • the intake valve 7 and the exhaust valve are substantially perpendicular to the face 2 and located, above the chamber 3, on the side of the side face 10, and each cooperate with one of two parallel pushers 13 , 14 actuated respectively by a cam 15 and a cam 16 integral with a shaft 17 carried by the cylinder head 1 parallel to the faces 2, 9 and 10.
  • the intake valve 8 is significantly inclined with respect to the other two valves and is located, above the chamber 3, on the side of the side face 9, where it cooperates with a rocker arm oscillating on an axis 19 and actuated by a cam 20 of the shaft 17.
  • This axis 19 is carried by several bearing caps 21 which hold the shaft 17 on transverse partitions 22 of the cylinder head 1.
  • Each valve is conventionally returned to its seat by a spring such as that 23 corresponding to the valve 7.
  • a cylinder head cover 24 covers the cylinder head 1 so as to protect the shaft 17 and its bearings 21, the rocker arms 18 and their axis 19 as well as the pushers 13, 14 and the springs.
  • a fuel injector 25 opening into the intake duct 4 slightly upstream of the valve 7 passes through the cylinder head cover 24 by a bore 26, with the interposition of a ring d tightness 27, and is maintained on the cylinder head cover 24 by a supply pipe 28 fixed to the latter, and an annular spacer 29 made of slightly flexible material and good thermal insulator is sandwiched between the cylinder head 1 and the cylinder head cover 24 in line with bore 26, coaxially with injector 25.
  • the injector 25, orthogonal to the shaft 17, is substantially parallel to the valve 8 and directed so that it provides a jet of fuel J reaching the valve 7 near its seat, wetting only a small area of the wall of the duct 4, which ensures optimum operation of the motor.
  • An injector 25 being associated with each combustion chamber 3, the injectors 25 are mutually parallel and supplied with fuel by the line 28 which has a ramp 30 perpendicular to the injectors, provided with lateral tubular end pieces 31 each engaged on the outer end an injector 25, coaxially with it, with the interposition of a ring, of sealing 32.
  • the pipe 28 is fixed to the cylinder head cover 24 by screws 33 passing through lugs 34 which project from the ramp 30.
  • Each bore 26 is arranged at the bottom of a hollow portion 36 of the cylinder head cover.
  • This portion 36 forming a funnel is interposed, in a direction parallel to the shaft 17, between two rockers 18 associated one with the chamber 3, the other with an adjacent chamber.
  • This arrangement makes it possible to optimally approach the injector 25 of the valve 7, although the latter is distant from the face 9 where the associated duct opens out. This distance is advantageous because it allows the admission orifices in the chamber 3 (valves 7 and 8) to be roughly diametrically opposite, while leaving space, under the conduit 4, for a spark plug 37 whose electrodes are advantageously located near the center of the chamber 3.
  • the injector 25 being carried by the cylinder head cover 24 and the latter being separated from the cylinder head 1 by the spacer 29 which is not very conductive of heat, the heating of the injector is lower than if it was conventionally fixed directly to the cylinder head 1. The risk of fuel evaporation in the injector is therefore reduced. Furthermore, the fixing of the ramp 30 to the cylinder head cover 24 by several screws 33, which can be relatively close together, gives the pipe 28 a satisfactory rigidity and a good resistance to vibrations, all the more so since these are somewhat filtered, in line with the cylinder head cover 24, by the usual seal 38 between the latter and the cylinder head 1 and by the flexible spacers 29.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

L'invention est relative aux culasses qui équipent certains moteurs à combustion et qui comportent, associé à chaque chambre de combustion, au moins un conduit d'admission dans lequel débouche un injecteur de carburant. Chaque conduit étant obturable, au droit de la chambre correspondante, par une soupape à tige, la culasse est généralement coiffée d'un couvre-culasse recouvrant divers organes de commande des soupapes, et notamment un arbre à cames et ses paliers, des culbuteurs et leur axe, des ressorts de rappel des soupapes, et éventuellement des poussoirs. Les injecteurs débouchent chacun dans un conduit d'admission légèrement en amont de la soupape associée.The invention relates to cylinder heads which equip certain combustion engines and which comprise, associated with each combustion chamber, at least one intake duct into which opens a fuel injector. Each duct being closable, to the right of the corresponding chamber, by a stem valve, the cylinder head is generally topped with a cylinder head cover covering various valve control members, and in particular a camshaft and its bearings, rockers and their axis, valve return springs, and possibly pushers. The injectors each open into an intake duct slightly upstream of the associated valve.

Chaque conduit d'admission reliant la chambre correspondante à une tubulure d'admission d'air jointe à la culasse, l'injecteur est habituellement fixé à celle-ci à proximité de la tubulure, ce qui ne permet pas toujours, en particulier quand le conduit est relativement long ou courbe, d'obtenir un jet optimal de carburant, c'est-à-dire un jet dirigé sur la soupape, et suffisamment court pour ne mouiller qu'une faible surface de la paroi du conduit. De plus, l'injecteur étant en contact direct avec la culasse, élément particulièrement chaud du moteur, le carburant qui s'y écoule risque de s'échauffer excessivement, voire de s'évaporer lors d'un arrêt du moteur, ce qui entraîne une importante difficulté de redémarrage de ce dernier.Each intake duct connecting the corresponding chamber to an air intake manifold joined to the cylinder head, the injector is usually fixed to the latter near the manifold, which does not always allow, in particular when the duct is relatively long or curved, to obtain an optimal jet of fuel, that is to say a jet directed at the valve, and short enough to wet only a small surface of the wall of the duct. In addition, the injector being in direct contact with the cylinder head, a particularly hot element of the engine, the fuel which drains there is likely to overheat, or even to evaporate during an engine stop, which causes a significant difficulty in restarting the latter.

Par ailleurs, la culasse portant en général plusieurs injecteurs associés respectivement à plusieurs chambres de combustion et alimentés par des canalisations comprenant en particulier une rampe d'alimentation commune, ces canalisations font parfois l'objet de ruptures à cause des vibrations du moteur auxquelles elles sont soumises et à cause de leur mode de fixation en des points relativement éloignés les uns des autres.In addition, the cylinder head generally carrying several injectors associated respectively with several combustion chambers and supplied by pipes comprising in particular a common supply rail, these pipes are sometimes subject to ruptures because of the vibrations of the engine to which they are subject and because of their method of attachment at points relatively distant from each other.

Les documents ci-dessous illustrent cet état de la technique.The documents below illustrate this state of the art.

Le DE-A-3 037 687 décrit une culasse de moteur à combustion interne, comportant des chambres de combustion à chacune desquelles est associé au moins un conduit d'admission dans lequel débouche un injecteur de carburant et qui est obturable, au droit de la chambre correspondante, par une soupape à tige, un couvre-culasse recouvrant des organes de commande des soupapes, les injecteurs étant alimentés par des canalisations et débouchant chacun dans un conduit d'admission légèrement en amont de la soupape associee.DE-A-3 037 687 describes an internal combustion engine cylinder head, comprising combustion chambers with each of which is associated with at least one intake duct into which opens a fuel injector and which is closable, in line with the corresponding chamber, by a stem valve, a cylinder head cover covering valve control members, the injectors being supplied by pipes and each opening into an intake duct slightly upstream of the associated valve.

Le FR-A-1 019 300 décrit un moteur avec un injecteur qui traverse de façon étanche le couvre-culasse.FR-A-1 019 300 describes an engine with an injector which passes tightly through the cylinder head cover.

Le DE-A-2 833 659 décrit un moteur avec des injecteurs débouchant chacun dans un conduit d'admission qui sont maintenus par la canalisation d'alimentation elle-même fixée sur le conduit d'admission.DE-A-2 833 659 describes an engine with injectors each opening into an intake duct which are held by the supply pipe itself fixed on the intake duct.

L'invention a pour but de réaliser une culasse équipée d'injecteurs qui procurent un jet de carburant optimal et dont l'échauffement ne soit pas excessif, leur alimentation étant assurée par des canalisation fiables.The object of the invention is to produce a cylinder head fitted with injectors which provide an optimal fuel jet and the heating of which is not excessive, their supply being ensured by reliable pipes.

Suivant l'invention, chaque injecteur traverse de façon étanche le couvre-culasse et est maintenu sur celui-ci par la canalisation d'alimentation elle-mêrrie fixée sur le couvre-culasse, et une entretoise annulaire légèrement souple et peu conductrice de la chaleur est enserrée entre la culasse et le couvre-culasse coaxialement à chaque injecteur.According to the invention, each injector sealingly passes through the cylinder head cover and is held thereon by the supply pipe itself fixed on the cylinder head cover, and an annular spacer slightly flexible and not very conductive of heat is clamped between the cylinder head and the cylinder head cover coaxially with each injector.

Selon d'autres particularités avantageuses de l'invention:

  • - la canalisation alimentant plusieurs injecteurs sensiblement parallèles entre eux et comportant une rampe sensiblement perpendiculaire aux injecteurs et munie d'embouts tubulaires coaxiaux à ceux-ci et engagés de façon étanche sur leur extrémité extérieure, la rampe est fixée au couvre-culasse par des vis sensiblement parallèles aux injecteurs;
  • - le conduit d'admission recevant l'injecteur débouchant sur une face latérale de la culasse, son extrémité obturable par la soupape associée est située, dans la chambre de combustion correspondante, du côté de la face latérale opposée;
  • - la culasse portant un arbre à cames qui coopère par l'intermédiaire de poussoirs avec les soupapes associées aux injecteurs, et par l'intermédiaire de culbuteurs avec d'autres soupapes, les injecteurs sont sensiblement parallèles à ces dernières, et le couvre-culasse comporte des portions en forme d'entonnoir contenant chacune l'un des injecteurs, et intercalées chacune, en direction parallèle à l'arbre, entre deux culbuteurs.
  • 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 la ligne 1 - de la Figure 2 d'une culasse de moteur à combustion interne selon l'invention;
  • - et la Figure 2 est une vue simplifiée de dessus, avec découpe partielle d'un couvre-culasse.
According to other advantageous features of the invention:
  • - the pipe supplying several injectors which are substantially parallel to each other and comprising a ramp substantially perpendicular to the injectors and provided with tubular end pieces coaxial with the latter and engaged in leaktight manner on their outer end, the ramp is fixed to the cylinder head cover by screws substantially parallel to the injectors;
  • - The intake duct receiving the injector opening onto a lateral face of the cylinder head, its end closable by the associated valve is located, in the corresponding combustion chamber, on the side of the opposite lateral face;
  • the cylinder head carrying a camshaft which cooperates by means of pushers with the valves associated with the injectors, and by means of rocker arms with other valves, the injectors are substantially parallel to the latter, and the cylinder head cover comprises funnel-shaped portions each containing one of the injectors, and each interposed, in a direction parallel to the shaft, between two rocker arms.
  • A nonlimiting example of embodiment of a cylinder head according to the invention is described below, with reference to the accompanying drawings in which:
  • - Figure 1 is an elevational view in section along line 1 - of Figure 2 of an internal combustion engine cylinder head according to the invention;
  • - And Figure 2 is a simplified view from above, with partial cutting of a cylinder head cover.

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, 5 et un conduit d'échappement 6 obturables respectivement de manière usuelle par des soupapes à tige d'admission 7, 8 ou d'echappement (non visible car cachée par la soupape 7 à la Figure 1). A leur extrémité opposée à la chambre 3, les conduits d'admission 4, 5 débouchent dans une première face latérale 9 de la culasse 1, et le conduit d'échappement 6 débouche dans la face opposée 10, en communiquant respectivement avec des tubulures d'admission 11 et d'échappement 12.We see in the Figures a cylinder head 1 of an internal combustion engine, intended to cover by its underside 2 a cylinder block by delimiting with pistons several combustion chambers 3. In each chamber 3 open two intake ducts 4 , 5 and an exhaust duct 6 which can be closed off in the usual manner respectively by intake rod 7, 8 or exhaust rod valves (not visible because hidden by the valve 7 in FIG. 1). At their end opposite to the chamber 3, the intake ducts 4, 5 open into a first lateral face 9 of the cylinder head 1, and the exhaust duct 6 opens into the opposite side 10, communicating respectively with intake 11 and exhaust 12.

La soupape d'admission 7 et la soupape d'échappement sont sensiblement perpendiculaires à la face 2 et situées, au-dessus de la chambre 3, du côté de la face latérale 10, et coopèrent chacune avec l'un de deux poussoirs parallèles 13, 14 actionnés respectivement par une came 15 et une came 16 solidaires d'un arbre 17 porté par la culasse 1 parallèlement aux faces 2, 9 et 10.The intake valve 7 and the exhaust valve are substantially perpendicular to the face 2 and located, above the chamber 3, on the side of the side face 10, and each cooperate with one of two parallel pushers 13 , 14 actuated respectively by a cam 15 and a cam 16 integral with a shaft 17 carried by the cylinder head 1 parallel to the faces 2, 9 and 10.

La soupape d'admission 8 est notablement inclinée par rapport aux deux autres soupapes et est située, au-dessus de la chambre 3, du côté de la face latérale 9, où elle coopère avec un culbuteur 18 oscillant sur un axe 19 et actionné par une came 20 de l'arbre 17. Cet axe 19 est porté par plusieurs chapeaux de paliers 21 qui maintiennent l'arbre 17 sur des cloisons transversales 22 de la culasse 1.The intake valve 8 is significantly inclined with respect to the other two valves and is located, above the chamber 3, on the side of the side face 9, where it cooperates with a rocker arm oscillating on an axis 19 and actuated by a cam 20 of the shaft 17. This axis 19 is carried by several bearing caps 21 which hold the shaft 17 on transverse partitions 22 of the cylinder head 1.

Chaque soupape est classiquement rappelée sur son siège par un ressort tel que celui 23 correspondant à la soupape 7.Each valve is conventionally returned to its seat by a spring such as that 23 corresponding to the valve 7.

Un couvre-culasse 24 coiffe la culasse 1 de manière à protéger l'arbre 17 et ses paliers 21, les culbuteurs 18 et leur axe 19 ainsi que les poussoirs 13, 14 et les ressorts.A cylinder head cover 24 covers the cylinder head 1 so as to protect the shaft 17 and its bearings 21, the rocker arms 18 and their axis 19 as well as the pushers 13, 14 and the springs.

Selon l'invention, pour chaque chambre de combustion 3, un injecteur de carburant 25 débouchant dans le conduit d'admission 4 légèrement en amont de la soupape 7 traverse le couvre-culasse 24 par un alésage 26, avec interposition d'une bague d'étanchéité 27, et est maintenu sur le couvre-culasse 24 par une canalisation d'alimentation 28 fixée à ce dernier, et une entretoise annulaire 29 en matériau légèrement souple et bon isolant thermique est enserrée entre la culasse 1 et le couvre-culasse 24 au droit de l'alésage 26, coaxialement à l'injecteur 25.According to the invention, for each combustion chamber 3, a fuel injector 25 opening into the intake duct 4 slightly upstream of the valve 7 passes through the cylinder head cover 24 by a bore 26, with the interposition of a ring d tightness 27, and is maintained on the cylinder head cover 24 by a supply pipe 28 fixed to the latter, and an annular spacer 29 made of slightly flexible material and good thermal insulator is sandwiched between the cylinder head 1 and the cylinder head cover 24 in line with bore 26, coaxially with injector 25.

L'injecteur 25, orthogonal à l'arbre 17, est sensiblement parallèle à la soupape 8 et dirigé de façon qu'il procure un jet de carburant J atteignant la soupape 7 à proximité de son siège, en ne mouillant qu'une faible surface de la paroi du conduit 4, ce qui assure un fonctionnement optimal du moteur.The injector 25, orthogonal to the shaft 17, is substantially parallel to the valve 8 and directed so that it provides a jet of fuel J reaching the valve 7 near its seat, wetting only a small area of the wall of the duct 4, which ensures optimum operation of the motor.

Un injecteur 25 étant associé à chaque chambre de combustion 3, les injecteurs 25 sont parallèles entre eux et alimentés en carburant par la canalisation 28 qui comporte une rampe 30 perpendiculaire aux injecteurs, munie d'embouts tubulaires latéraux 31 engagés chacun sur l'extrémité extérieure d'un injecteur 25, coaxialement à lui, avec interposition d'une bague, d étanchéité 32. La canalisation 28 est fixée au couvre-culasse 24 par des vis 33 traversant des pattes 34 qui saillent de la rampe 30. Ces vis 33 sont parallèles aux injecteurs 25, de sorte que leur vissage assure le montage coulissant de chaque embout 31 sur l'extrémité extérieure de l'injecteur correspondant 25, au droit de la bague 32, jusqu'à proximité d'une face annulaire 35 de l'injecteur 25, celui-ci étant par suite maintenu axialement entre le couvre-culasse 24 et l'embout 31.An injector 25 being associated with each combustion chamber 3, the injectors 25 are mutually parallel and supplied with fuel by the line 28 which has a ramp 30 perpendicular to the injectors, provided with lateral tubular end pieces 31 each engaged on the outer end an injector 25, coaxially with it, with the interposition of a ring, of sealing 32. The pipe 28 is fixed to the cylinder head cover 24 by screws 33 passing through lugs 34 which project from the ramp 30. These screws 33 are parallel to the injectors 25, so that their screwing ensures the sliding mounting of each end piece 31 on the outer end of the corresponding injector 25, in line with the ring 32, up to the proximity of an annular face 35 of the injector 25, the latter being consequently held axially between the cylinder head cover 24 and the end piece 31.

Chaque alésage 26 est agencé au fond d'une portion creuse 36 du couvre-culasse. Cette portion 36 formant entonnoir, est intercalée, en direction parallèle à l'arbre 17, entre deux culbuteurs 18 associés l'un à la chambre 3, l'autre à une chambre voisine. Cette disposition permet d'approcher de façon optimale l'injecteur 25 de la soupape 7 quoique celle-ci soit éloignée de la face 9 où débouche le conduit associé 4. Cet éloignement est intéressant car il permet aux orifices d'admission dans la chambre 3 (soupapes 7 et 8) d'être à peu près diamètralement opposés, tout en laissant place, sous le conduit 4, à une bougie d'allumage 37 dont les électrodes sont avantageusement situées près du centre de la chambre 3.Each bore 26 is arranged at the bottom of a hollow portion 36 of the cylinder head cover. This portion 36 forming a funnel is interposed, in a direction parallel to the shaft 17, between two rockers 18 associated one with the chamber 3, the other with an adjacent chamber. This arrangement makes it possible to optimally approach the injector 25 of the valve 7, although the latter is distant from the face 9 where the associated duct opens out. This distance is advantageous because it allows the admission orifices in the chamber 3 (valves 7 and 8) to be roughly diametrically opposite, while leaving space, under the conduit 4, for a spark plug 37 whose electrodes are advantageously located near the center of the chamber 3.

L'injecteur 25 étant porté par le couvre-culasse 24 et celui-ci étant séparé de la culasse 1 par l'entretoise 29 peu conductrice de la chaleur, l'échauffement de l'injecteur est plus faible que s'il était classiquement fixé directement à la culasse 1. Le risque d'évaporation du carburant dans l'injecteur est donc amoindri. Par ailleurs, la fixation de la rampe 30 sur le couvre-culasse 24 par plusieurs vis 33, qui peuvent être relativement rapprochées, procure à la canalisation 28 une rigidité satisfaisante et une, bonne résistance aux vibrations, d'autant plus que celles-ci sont quelque peu filtrées, au droit du couvre-culasse 24, par l'habituel joint 38 entre ce dernier et la culasse 1 et par les entretoises souples 29.The injector 25 being carried by the cylinder head cover 24 and the latter being separated from the cylinder head 1 by the spacer 29 which is not very conductive of heat, the heating of the injector is lower than if it was conventionally fixed directly to the cylinder head 1. The risk of fuel evaporation in the injector is therefore reduced. Furthermore, the fixing of the ramp 30 to the cylinder head cover 24 by several screws 33, which can be relatively close together, gives the pipe 28 a satisfactory rigidity and a good resistance to vibrations, all the more so since these are somewhat filtered, in line with the cylinder head cover 24, by the usual seal 38 between the latter and the cylinder head 1 and by the flexible spacers 29.

Claims (4)

1. An internal combustion engine cylinder head comprising combustion chambers (3) with each of which at least one admission duct (4, 5) is associated into which a fuel injector (25) discharges and which can be closed in line with the corresponding chamber (3) by a stem-type valve (7, 8), a cylinder head cap (24) covering valve control members, the injectors (25) being supplied via pipes (28) and each discharging into an admission duct (4) slightly upstream of the associated valve (7), characterized in that each injector (25) extends in sealing-tight relationship through the cylinder head cap (24) and is retained thereon by the supply pipe (28), which is itself attached on the cylinder head cap (24), and an annular spacing member (29) which is slightly resilient and a poor conductor of heat is clamped between the cylinder head (1) and the cylinder head cap coaxially with each injector (25).
2. A cylinder head according to claim 1, characterized in that the pipe (28) supplying a plurality of substantially parallel injectors (25) comprises a manifold (30) which is substantially perpendicular to the injectors (25) and has tubular end members (31) coaxial with the injector (25) and engaging sealing tight on their outer end, the manifold (30) being attached to the cyyinder head cap (24) by screws (33) which are substantially parallel with the injectors (25).
3. A cylinder head according to one of claims 1 and 2, characterized in that the admission duct (4) receiving the injector (25) discharges on to a lateral face (9) of the cylinder head (1) and its end closable by the associated valve (7) is located, in the correspondjng combustion chamber, adjacent the opposite lateral face (10).
4. A cylinder head according to one of claims 1 to 3, characterized in that the cylinder head (1) bears a shaft (17) with cams (15,16, 20) which cooperates via pushers (13) with the valves (7) associated with the injectors (25), and via rocker arms (18) with other valves (8), the injectors are substantially parallel with the valves, and the cylinder head cap (24) comprises funnel-shaped portions (36) each contajning one of the injectors (25) and each interposed, in a direction parallel with the shaft (17), between two rocker arms (18).
EP86401435A 1985-07-08 1986-06-27 Cylinder head for a fuel injection internal-combustion engine Expired EP0210098B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8510423 1985-07-08
FR8510423A FR2584454B1 (en) 1985-07-08 1985-07-08 CYLINDER HEAD OF INTERNAL COMBUSTION ENGINE SUPPLIED BY INJECTION

Publications (2)

Publication Number Publication Date
EP0210098A1 EP0210098A1 (en) 1987-01-28
EP0210098B1 true EP0210098B1 (en) 1989-01-25

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EP86401435A Expired EP0210098B1 (en) 1985-07-08 1986-06-27 Cylinder head for a fuel injection internal-combustion engine

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US (1) US4757789A (en)
EP (1) EP0210098B1 (en)
JP (1) JPS6210469A (en)
BR (1) BR8603170A (en)
DE (1) DE3661959D1 (en)
FR (1) FR2584454B1 (en)

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Also Published As

Publication number Publication date
BR8603170A (en) 1987-02-24
FR2584454A1 (en) 1987-01-09
US4757789A (en) 1988-07-19
EP0210098A1 (en) 1987-01-28
FR2584454B1 (en) 1987-11-20
DE3661959D1 (en) 1989-03-02
JPS6210469A (en) 1987-01-19

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