EP3388661B1 - Fuel rail cover with fuel return - Google Patents

Fuel rail cover with fuel return Download PDF

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Publication number
EP3388661B1
EP3388661B1 EP18165119.1A EP18165119A EP3388661B1 EP 3388661 B1 EP3388661 B1 EP 3388661B1 EP 18165119 A EP18165119 A EP 18165119A EP 3388661 B1 EP3388661 B1 EP 3388661B1
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EP
European Patent Office
Prior art keywords
fuel
return
injector
connection
end piece
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.)
Active
Application number
EP18165119.1A
Other languages
German (de)
French (fr)
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EP3388661A1 (en
Inventor
Benjamin DEVUN
Jean-François Moulin
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Renault SAS
Original Assignee
Renault SAS
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Publication of EP3388661A1 publication Critical patent/EP3388661A1/en
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Publication of EP3388661B1 publication Critical patent/EP3388661B1/en
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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/857—Mounting of fuel injection apparatus characterised by mounting fuel or common rail to engine
    • 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

Definitions

  • the present invention relates to a device for supplying high pressure fuel to a heat engine of a motor vehicle comprising a fuel return system.
  • the present invention also relates to a method for fixing a protective cover above a yoke covering the power supply device.
  • a heat engine of a motor vehicle comprises a cylinder block surmounted by a cylinder head; said crankcase cylinders in each of which a piston is driven in a sliding movement along the axis of the cylinder and which are limited in the upper part by the cylinder head.
  • the cylinder head comprises air and/or gas intake pipes and burnt gas exhaust pipes, said pipes emerging from the cylinder head into the cylinders through openings which are controlled by valves.
  • the cylinder head also comprises tubular ducts also leading into the cylinders, in said ducts are driven fuel injectors capable of injecting fuel into the cylinders. The mixture of fuel and fresh air is burned in the cylinders and allows the sliding of the piston.
  • Fuel is therefore brought at high pressure to the injectors by pipes from a fuel rail arranged in the upper part of the cylinder head.
  • the operation of the injectors involves a fuel leak rate, low pressure leak rate. This leaking fuel must then be brought to a fuel tank.
  • the operation of the high-pressure fuel rail also generates a fuel leak flow which is also returned to said fuel tank.
  • Said tank is thus connected on the one hand to a fuel return junction of each of the injectors and on the other hand to a return junction of the fuel rail.
  • the rail, the injectors and the pipes are arranged in the upper part of the cylinder head and covered by a protective cover.
  • the present invention relates to a protective casing for an internal combustion engine injection system intended for motor vehicles.
  • Motor vehicle injection systems are generally mounted in the upper part of the engine, which comprises cylinders closed by a cylinder head. Each cylinder comprises a piston whose upper surface forms with the cylinder head a combustion chamber.
  • the fuel is injected into the combustion chamber by means of injectors.
  • Injection systems include an injection rail mounted on the cylinder head of the engine and located between an injection pump and the injectors. The injection rail is supplied under high pressure with fuel by the pump and it is connected to the injectors by pipes. It thus constitutes a reserve of pressurized fuel and the injectors, at a frequency determined according to the rotational speed of the engine, inject the fuel into the combustion chambers.
  • a drawback of these supply systems resides in particular in the nature of the pipe connections, both on the injection rail and on the injectors. These connections are generally screw connections and they can present risks of leaks. The fuel from these leaks, liquid or vaporized, is likely to spread into the environment around the engine. To prevent the projection of fuel due to leaks, it has been imagined, for example in the document EP1172551 , to completely cover the injection system with a box including the injectors, the pipes and the injection rail. However, such a box is very bulky and it is not suitable for engines where the injection is carried out on the front face for which the available space is reduced.
  • WO 2015/087105 A1 also features a fuel return system and a protective cover.
  • the object of the invention is to remedy these problems and one of the objects of the invention is a fuel return system from the injectors and the high pressure rail.
  • a problem which arises and which the present invention aims to solve, is then to provide a box which makes it possible to avoid too many connections for the return of fuel from the injectors and from the fuel injection rail while ensuring the reliability of said connections.
  • the present invention proposes a protective box for an injection system of an internal combustion engine, said injection system comprising an injection rail which is fed by a pump and which is connected by pipes to injectors mounted in a cylinder head of said engine, said casing comprising a wall whose free lower edges are intended to join said cylinder head in leaktight manner, and said wall being adapted to extend to surround and cover said injection rail and said injectors.
  • the present invention relates more particularly to a high-pressure fuel supply device for a heat engine of a motor vehicle covered by a protective cover which is formed by vertical walls topped by a flat wall, and comprising an injection rail connected by pipes to at least one injector mounted in a cylinder head of said engine and a fuel return system comprising a pipe, characterized in that the fuel return pipe is fixed parallel to the flat wall of the protective cover and comprises a connection with a fuel return nozzle of the at least one injector, said connection extending transversely to the axis of the pipe towards the cylinder head.
  • the fuel return system is fixed to a protective cover of the device generally covering the fuel injection rail and the fuel injector(s) arranged on an upper wall of the cylinder head, which reduces the size on said upper wall and facilitates the assembly of the assembly.
  • the fuel return system comprises a line connected with a fuel return fitting of the at least injector, said fitting allows a connection by pressing in with a fitting facing the line to obtain a fluid-tight connection , making assembly easier.
  • connection of the pipe with the tip of the at least one injector is a quick and reversible connection.
  • connection between the pipe and the at least one injector is a quick connection to facilitate mounting of the protective cover.
  • the quick fixing of the fuel return pipe with the nozzle of at least one injector makes it possible to improve the assembly of the assembly of the fuel return device and of the protective cover and to reduce the time of assembly.
  • connection between the fuel return pipe and the fuel return fitting of the injection rail is a quick connection to facilitate assembly of the entire return device.
  • the quick connect provides a fluid seal to the fitting as fuel pressure is low in the fuel return line.
  • upper/lower refer to a height positioning along a vertical axis perpendicular to the plane of the vehicle passing through the wheel axles of said vehicle.
  • a thermal or internal combustion motor vehicle engine comprises a cylinder block surmounted by a cylinder head (not shown), these two elements delimit combustion chambers.
  • a cylinder head In the cylinder head, are dug tubular ducts adapted to house injectors 11 intended to send fuel into one of the combustion chambers (not shown).
  • the fuel comes from an injection rail 12 via a supply pipe 13 connecting an outlet connector 14 of said rail to an inlet connector 15 of the injector 11.
  • the fuel from the injection rail is at very high pressure, of the order of 1000 to 3000 bars.
  • it is necessary to have a fuel return circuit in which the fuel pressure is much lower, of the order of 1 to 3 bars.
  • the fuel return circuit allows the recovery of excess fuel or leaks from the injection circuit.
  • Said fuel return circuit comprises a fuel return system 10 arranged on an upper wall of the cylinder head.
  • the fuel return system comprises a fuel return pipe 50 fixed parallel to a flat wall 16 of a protective cover 17, said flat wall forms a ceiling of a chamber delimited by the upper wall of the cylinder head and the cover, in which the injection rail 12 and the injectors 11 are arranged.
  • the protective cover 17 is formed by vertical walls 18, two longitudinal walls joined to two transverse walls, said vertical walls are surmounted by the flat wall 16.
  • the fuel injectors 11 are four in number but this number can vary from one heat engine to another depending on the number of cylinders that the heat engine comprises.
  • the injectors are substantially cylindrical and fixed through the upper wall of the cylinder head and have a emerged upper end 27.
  • Said upper end comprises the fuel inlet connector 15 substantially transverse to the axis of the injector and a return end piece 19 fuel.
  • Said return end piece axially extends the upper end of the injector.
  • said return fitting 19 is of the female type and comprises an axial cylindrical cavity 20 emerging from the upper end of the fitting.
  • a return conduit (not shown) is connected to this cylindrical cavity for fuel return.
  • the injection rail 12 is substantially tubular and rests along its length on the upper wall of the cylinder head. As represented in figure 1 and 4 , it is cylindrical. It includes 14 output connectors, at number of four according to the figures, each of the outlet connectors is connected to an inlet connector 15 of an injector via the supply pipe 13.
  • the injection rail comprises a cylindrical protuberance 22 terminating in a return nozzle 23 fuel directed along an axis parallel to the axis of the injector which is vertical and perpendicular to the plane of the upper wall of the cylinder head.
  • the injection rail return end piece is of the male type and may comprise hooking projections extending transversely to the axis of said end piece and an O-ring arranged at a free end of the end piece (not shown ).
  • the fuel return nozzle of the injection rail also comprises a cylindrical cavity 24 opening out in the upper part of the nozzle. It can be the same for the dimensions of this cylindrical cavity 24 with those of the cylindrical cavity 20 of the return fitting 19 of the injector.
  • the pipe 50 of the fuel return system 10 comprises receiving end pieces 24, 24′ that are substantially cylindrical and extending transversely to the axis of the pipe towards the cylinder head and adapted to cooperate with the return end piece 19 of the other. least one injector 11 and the injection rail 12.
  • the pipe 50 thus comprises reception end pieces 24 of the male type adapted to be pushed into the cylindrical cavities of the return end pieces of the injectors 11.
  • Said reception end pieces 24 may comprise at a free end hooking projections 25 extending transversely to the axis of the tip towards the outside of said receiving tip, the overall outside diameter of the receiving tip with said projections is slightly greater than the inside diameter of the cylindrical cavity 24 of the return tip 19 of the injector 11.
  • the projections can be associated with O-rings to allow optimal fluid sealing.
  • Each receiving end piece is arranged so that the lower end of the receiving end piece faces the cylindrical cavity of the return end piece 19 of the injector. In this way the receiving tip 24 can be received in the cylindrical cavity of the tip of back 19 and thus form a quick push-in connection. This connection is also reversible because at the cost of a small retraction effort, it is possible to easily separate the receiving end piece from the return end piece of the injectors 11.
  • the return pipe 50 also includes a female-type receiving end piece 24' to receive the return end piece 23 of the injection manifold 12.
  • Said receiving end piece is substantially cylindrical comprising an inner duct whose diameter is slightly less than the outside diameter of the return fitting 23 of the injection rail with the hooking projections and the sealing O-ring.
  • This receiving end piece 24' is arranged so that the free lower end of its inner duct is facing the return end piece 23 of the injection ramp 12. In this way, the return end piece 23 can be easily pushed into the inner duct to ensure the fluidic continuity of the fuel return from the injection rail.
  • This connection is also reversible because at the cost of a small retraction effort, it is possible to easily separate the reception end piece 24' from the return end piece of the injection rail 12.
  • the depth of insertion of the receiving end piece into the return end piece is equal for the injectors and the injection rail.
  • the height of the vertical wall is preferably equal to or slightly equal to the height formed by the assembly of the connections between the reception and return end fittings, naturally taking into account the dimensions of the injection rail and the ends of the injectors emerging from the upper flat wall of the cylinder head.
  • the fuel return pipe passes through one of the vertical walls of the protective cover and is terminated by a connecting piece 26.
  • Said connecting piece can be connected to the fuel tank by a connecting pipe (not shown).
  • the fuel return line may also include another outlet passing through one of the vertical walls to be connected to an engine fuel pump (not shown).
  • the return pipe 50 can also be in one piece with the cover to facilitate assembly and reduce the number of part numbers to be assembled.
  • the return nozzles of the injection rail and of the injectors can optionally be directed along a horizontal axis, that is to say parallel to the upper wall of the cylinder head facing the same side associated with the same vertical wall. of the lid.
  • the cover will be slipped parallel to the axis of the end pieces using slides for example, then on reaching a stop which corresponds to the sinking of the reception end pieces into the cylindrical cavities of the return end pieces, the cover is then fixed to the cylinder head by threaded connections.

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un dispositif d'alimentation haute pression de carburant d'un moteur thermique de véhicule automobile comprenant un système de retour de carburant. La présente invention concerne aussi un procédé de fixation d'un couvercle de protection au-dessus d'une culasse recouvrant le dispositif d'alimentation.The present invention relates to a device for supplying high pressure fuel to a heat engine of a motor vehicle comprising a fuel return system. The present invention also relates to a method for fixing a protective cover above a yoke covering the power supply device.

Etat de la techniqueState of the art

De manière connue, un moteur thermique de véhicule automobile comporte un carter-cylindres surmonté par une culasse ; ledit carter-cylindres des cylindres dans chacun desquels un piston est animé d'un mouvement en coulissement selon l'axe du cylindre et qui sont limités en partie supérieure par la culasse. La culasse comprend des canalisations d'admission d'air et/ou de gaz et des canalisations d'échappement des gaz brulés, lesdites canalisations débouchent de la culasse dans les cylindres par des ouvertures qui sont commandées par des soupapes. La culasse comprend également des conduits tubulaires donnant également dans les cylindres, dans lesdits conduits sont enfoncés des injecteurs de carburant aptes à injecter du carburant dans les cylindres. Le mélange de carburant et d'air frais est brulé dans les cylindres et permet le coulissement du piston. Du carburant est donc amené à haute pression aux injecteurs par des tuyaux depuis une rampe à carburant agencée en partie supérieure de la culasse. Le fonctionnement des injecteurs implique un débit de fuite de carburant, débit de fuite à basse pression. Cette fuite de carburant doit alors être amenée à un réservoir de carburant. De même, le fonctionnement de la rampe à carburant haute pression génère un également un débit de fuite de carburant qui est également ramené vers ledit réservoir de carburant. Ledit réservoir est ainsi connecté d'une part à une jonction de retour de carburant de chacun des injecteurs et d'autre part à une jonction de retour de la rampe à carburant.In known manner, a heat engine of a motor vehicle comprises a cylinder block surmounted by a cylinder head; said crankcase cylinders in each of which a piston is driven in a sliding movement along the axis of the cylinder and which are limited in the upper part by the cylinder head. The cylinder head comprises air and/or gas intake pipes and burnt gas exhaust pipes, said pipes emerging from the cylinder head into the cylinders through openings which are controlled by valves. The cylinder head also comprises tubular ducts also leading into the cylinders, in said ducts are driven fuel injectors capable of injecting fuel into the cylinders. The mixture of fuel and fresh air is burned in the cylinders and allows the sliding of the piston. Fuel is therefore brought at high pressure to the injectors by pipes from a fuel rail arranged in the upper part of the cylinder head. The operation of the injectors involves a fuel leak rate, low pressure leak rate. This leaking fuel must then be brought to a fuel tank. Similarly, the operation of the high-pressure fuel rail also generates a fuel leak flow which is also returned to said fuel tank. Said tank is thus connected on the one hand to a fuel return junction of each of the injectors and on the other hand to a return junction of the fuel rail.

De manière connue, la rampe, les injecteurs et les tuyaux sont agencés en partie supérieure de la culasse et recouverts par un couvercle de protection.In known manner, the rail, the injectors and the pipes are arranged in the upper part of the cylinder head and covered by a protective cover.

La présente invention se rapporte à un boîtier de protection pour un système d'injection de moteur à combustion interne destiné aux véhicules automobiles. Les systèmes d'injection des véhicules automobiles sont généralement montés en partie haute du moteur, lequel comporte des cylindres refermés par une culasse. Chaque cylindre comprend un piston dont la surface supérieure forme avec la culasse une chambre de combustion. On injecte le carburant dans la chambre de combustion au moyen d'injecteurs, Les systèmes d'injection comprennent une rampe d'injection montée sur la culasse du moteur et située entre une pompe d'injection et les injecteurs. La rampe d'injection est alimentée sous haute pression en carburant par la pompe et elle est reliée aux injecteurs par des conduites. Elle constitue ainsi une réserve de carburant sous pression et les injecteurs, à une fréquence déterminée en fonction de la vitesse de rotation du moteur, injectent le carburant dans les chambres de combustion. Un inconvénient de ces systèmes d'alimentation réside notamment' dans la nature des raccords des conduites, à la fois sur fa rampe d'injection et sur les injecteurs. Ces raccords sont généralement des liaisons à vis et ils peuvent présenter des risques de fuites. Le carburant provenant de ces fuîtes, liquide ou vaporisé, est susceptible de se répandre dans l'environnement au moteur. Pour prévenir la projection de carburant due aux fuîtes, il a été Imaginé, par exemple dans le document EP1172551 , de recouvrir complètement le système d'injection avec un boîtier en englobant les injecteurs, les conduites et la rampe d'injection. Toutefois, un tel boîtier est fort encombrant et il n'est pas adapté aux moteurs où l'injection est réalisée en face avant pour lesquels l'espace disponible est réduit. WO 2015/087105 A1 divulgue aussi un système retour de carburant et une couvercle de protection.The present invention relates to a protective casing for an internal combustion engine injection system intended for motor vehicles. Motor vehicle injection systems are generally mounted in the upper part of the engine, which comprises cylinders closed by a cylinder head. Each cylinder comprises a piston whose upper surface forms with the cylinder head a combustion chamber. The fuel is injected into the combustion chamber by means of injectors. Injection systems include an injection rail mounted on the cylinder head of the engine and located between an injection pump and the injectors. The injection rail is supplied under high pressure with fuel by the pump and it is connected to the injectors by pipes. It thus constitutes a reserve of pressurized fuel and the injectors, at a frequency determined according to the rotational speed of the engine, inject the fuel into the combustion chambers. A drawback of these supply systems resides in particular in the nature of the pipe connections, both on the injection rail and on the injectors. These connections are generally screw connections and they can present risks of leaks. The fuel from these leaks, liquid or vaporized, is likely to spread into the environment around the engine. To prevent the projection of fuel due to leaks, it has been imagined, for example in the document EP1172551 , to completely cover the injection system with a box including the injectors, the pipes and the injection rail. However, such a box is very bulky and it is not suitable for engines where the injection is carried out on the front face for which the available space is reduced. WO 2015/087105 A1 also features a fuel return system and a protective cover.

Le but de l'invention est de remédier à ces problèmes et un des objets de l'invention est un système de retour de carburant depuis les injecteurs et la rampe haute pression.The object of the invention is to remedy these problems and one of the objects of the invention is a fuel return system from the injectors and the high pressure rail.

Un problème qui se pose et que vise à résoudre la présente invention, est alors de fournir un boîtier qui permette d'éviter de trop nombreuses connexions pour le retour de carburant depuis les injecteurs et depuis la rampe d'injection de carburant tout en assurant la fiabilité desdites connexions.A problem which arises and which the present invention aims to solve, is then to provide a box which makes it possible to avoid too many connections for the return of fuel from the injectors and from the fuel injection rail while ensuring the reliability of said connections.

A cet effet, la présente invention propose un boîtier de protection pour un système d'injection d'un moteur à combustion interne, ledit système d'injection comprenant une rampe d'injection qui est alimentée par une pompe et qui est reliée par des conduites à des injecteurs montés dans une culasse dudit moteur, ledit boîtier comportant une paroi dont les bords inférieurs libres sont destinés à joindre de façon étanche ladite culasse, et ladite paroi étant adaptée à s'étendre pour entourer et recouvrir ladite rampe d'injection et lesdits injecteurs.To this end, the present invention proposes a protective box for an injection system of an internal combustion engine, said injection system comprising an injection rail which is fed by a pump and which is connected by pipes to injectors mounted in a cylinder head of said engine, said casing comprising a wall whose free lower edges are intended to join said cylinder head in leaktight manner, and said wall being adapted to extend to surround and cover said injection rail and said injectors.

Présentation de l'inventionPresentation of the invention

La présente invention concerne plus particulièrement un dispositif d'alimentation haute pression de carburant d'un moteur thermique de véhicule automobile recouvert par un couvercle de protection qui est formé par des parois verticales surmontées par une paroi plane, et comprenant une rampe d'injection reliée par des conduites à au-moins un injecteur monté dans une culasse dudit moteur et un système de retour de carburant comportant une canalisation,caractérisé en ce que la canalisation de retour de carburant est fixée parallèlement à la paroi plane du couvercle de protection et comprend une connexion avec un embout de retour de carburant du au-moins un injecteur, ladite connexion s'étendant transversalement à l'axe de la canalisation vers la culasse.The present invention relates more particularly to a high-pressure fuel supply device for a heat engine of a motor vehicle covered by a protective cover which is formed by vertical walls topped by a flat wall, and comprising an injection rail connected by pipes to at least one injector mounted in a cylinder head of said engine and a fuel return system comprising a pipe, characterized in that the fuel return pipe is fixed parallel to the flat wall of the protective cover and comprises a connection with a fuel return nozzle of the at least one injector, said connection extending transversely to the axis of the pipe towards the cylinder head.

Le système de retour de carburant est fixé à un couvercle de protection du dispositif recouvrant globalement la rampe d'injection de carburant et le ou les injecteurs de carburant agencés sur une paroi supérieure de la culasse, ce qui réduit l'encombrement sur ladite paroi supérieure et facilite le montage de l'ensemble.The fuel return system is fixed to a protective cover of the device generally covering the fuel injection rail and the fuel injector(s) arranged on an upper wall of the cylinder head, which reduces the size on said upper wall and facilitates the assembly of the assembly.

Selon d'autres caractéristiques de l'invention :

  • le système comporte une canalisation connectée de façon étanche par enfoncement avec un embout de retour de carburant du au-moins un injecteur.
According to other characteristics of the invention:
  • the system comprises a pipe connected in a leaktight manner by pressing in with a fuel return fitting of the at least one injector.

Le système de retour de carburant comporte une canalisation connectée avec un embout de retour de carburant du au-moins injecteur, ledit embout permet une connexion par enfoncement avec un raccord en vis-à-vis de la canalisation pour obtenir une connexion étanche de façon fluidique, rendant ainsi le montage plus facile.The fuel return system comprises a line connected with a fuel return fitting of the at least injector, said fitting allows a connection by pressing in with a fitting facing the line to obtain a fluid-tight connection , making assembly easier.

De manière avantageuse, la connexion de la canalisation avec l'embout du au-moins un injecteur est une connexion rapide et réversible.Advantageously, the connection of the pipe with the tip of the at least one injector is a quick and reversible connection.

De manière avantageuse, la connexion entre la canalisation et le au-moins un injecteur est une connexion rapide pour faciliter le montage du couvercle de protection. En effet, la fixation rapide de la canalisation de retour de carburant avec l'embout du au-moins un injecteur permet d'améliorer le montage de l'ensemble du dispositif de retour de carburant et du couvercle de protection et de réduire le temps de montage.Advantageously, the connection between the pipe and the at least one injector is a quick connection to facilitate mounting of the protective cover. Indeed, the quick fixing of the fuel return pipe with the nozzle of at least one injector makes it possible to improve the assembly of the assembly of the fuel return device and of the protective cover and to reduce the time of assembly.

La connexion est réversible pour permettre de désolidariser facilement la canalisation de l'embout de l'injecteur lors de l'accès par exemple à l'injecteur pour remplacement.

  • l'embout de retour de carburant est dirigé selon l'axe du au-moins un injecteur cylindrique.
The connection is reversible to allow easy separation of the pipe from the nozzle of the injector when accessing, for example, the injector for replacement.
  • the fuel return nozzle is directed along the axis of the at least one cylindrical injector.

De manière avantageuse, l'embout de retour de carburant du au-moins un injecteur est dirigé selon l'axe du au-moins un injecteur cylindrique et pointé du côté opposé à la culasse, ce qui permet une connexion simple et rapide de la rampe de retour de carburant qui vient se fixer sur l'embout par un mouvement selon une direction sensiblement orthogonale au plan de paroi de la culasse, sensiblement identique au mouvement de fixation du couvercle de protection sur la culasse.

  • la canalisation comporte une connexion étanche de façon fluidique, par enfoncement avec un embout de retour de carburant de la rampe d'injection.
Advantageously, the fuel return nozzle of the at least one injector is directed along the axis of the at least one cylindrical injector and pointed on the side opposite the cylinder head, which allows simple and quick connection of the ramp fuel return which is fixed on the nozzle by a movement in a direction substantially orthogonal to the wall plane of the cylinder head, substantially identical to the movement of fixing the protective cover on the cylinder head.
  • the pipe has a fluid-tight connection, by insertion with a fuel return nozzle of the injection rail.

De manière avantageuse, la canalisation de retour comporte une connexion étanche de façon fluidique, par enfoncement avec un embout de retour de la rampe d'injection pour faciliter le montage du dispositif, sensiblement analogue à la connexion antre ladite canalisation et l'embout du au-moins un injecteur, ce qui permet un montage simple de l'ensemble des connexions des différents éléments de retour de carburant avec la canalisation.

  • la connexion entre la canalisation et l'embout de retour de carburant de la rampe d'injection est une connexion rapide et réversible.
Advantageously, the return pipe comprises a fluid-tight connection, by insertion with a return end piece of the injection rail to facilitate assembly of the device, substantially analogous to the connection between said pipe and the end piece of the - minus one injector, which allows simple assembly of all the connections of the various fuel return elements with the pipe.
  • the connection between the line and the fuel return fitting of the injection rail is a quick and reversible connection.

De manière avantageuse, la connexion entre la canalisation de retour de carburant et l'embout de retour de carburant de la rampe d'injection est une connexion rapide pour faciliter le montage de l'ensemble du dispositif de retour. La connexion rapide permet une étanchéité fluidique du raccord, la pression du carburant étant basse dans la canalisation de retour de carburant.Advantageously, the connection between the fuel return pipe and the fuel return fitting of the injection rail is a quick connection to facilitate assembly of the entire return device. The quick connect provides a fluid seal to the fitting as fuel pressure is low in the fuel return line.

La connexion est réversible pour permettre de désolidariser facilement la canalisation de l'embout de la rampe d'injection lors de l'accès par exemple à ladite rampe pour une opération particulière.

  • l'embout de retour de carburant de la rampe d'injection est selon une direction parallèle à l'axe du au-moins un injecteur.
The connection is reversible to allow easy separation of the pipe from the end piece of the injection rail when accessing, for example, said rail for a particular operation.
  • the fuel return nozzle of the injection rail is in a direction parallel to the axis of the at least one injector.

De manière avantageuse, la connexion entre la canalisation avec la rampe d'injection et la canalisation est dirigée selon une direction parallèle à l'axe du au au-moins un injecteur, ce qui permet d'avoir le même mouvement de fixation de la canalisation avec les embouts de retour des différents éléments d'injection de carburant.

  • la canalisation comporte des embouts de réception aptes à coopérer avec les embouts de retour de carburant du au-moins un injecteur et de la rampe d'injection.
Advantageously, the connection between the pipe with the injection rail and the pipe is directed in a direction parallel to the axis of the at least one injector, which makes it possible to have the same fixing movement of the pipe with the return tips of the various fuel injection elements.
  • the pipe comprises receiving endpieces capable of cooperating with the fuel return endpieces of the at least one injector and of the injection rail.

De manière avantageuse, la canalisation comporte des embouts aptes à coopérer avec les embouts de retour des différents éléments d'injection de carburant qui sont le au-moins un injecteur et la rampe d'injection. Lesdits embouts formant avec les embouts de retour desdits différents éléments d'injection des connexions rapides de type mâle/femelle étanches de façon fluidique. Le montage de l'ensemble est donc aisé.

  • la canalisation débouche par une face latérale du couvercle par un embout de raccordement.
Advantageously, the pipe comprises end pieces capable of cooperating with the return end pieces of the various fuel injection elements which are the at least one injector and the injection rail. Said end pieces forming with the return end pieces of said different elements injection of fluidically sealed male/female type quick connections. Assembly of the assembly is therefore easy.
  • the pipe opens via a side face of the cover via a connection end piece.

De manière avantageuse, la canalisation comporte un embout de raccordement débouchant d'une face latérale du couvercle de protection pour être connecté avec un réservoir de carburant. L'embout de raccordement permet de disposer ainsi d'un ensemble modulaire et homogène de retour de carburant comprenant le couvercle, le au-moins un injecteur et la rampe d'injection.

  • la canalisation est partie du couvercle de protection.
Advantageously, the pipe includes a connection end piece emerging from a side face of the protective cover to be connected with a fuel tank. The connection piece thus makes it possible to have a modular and homogeneous fuel return assembly comprising the cover, the at least one injector and the injection rail.
  • the pipe is part of the protective cover.

De manière avantageuse, la canalisation de retour de carburant est partie du couvercle de protection ; ainsi ledit couvercle peut comprendre une protubérance tubulaire s'étendant depuis une paroi plane du couvercle et plus précisément d'un plafond d'une chambre délimitée par la paroi plane de la culasse et le couvercle de protection qui présente une forme de coque avec une base sensiblement rectangulaire. Ainsi le couvercle comporte une canalisation de retour avec ses embouts de retour dont les positions sont ajustés au-dessus des embouts de retour de carburant de la rampe d'injection et du au-moins un injecteur.

  • la fixation du couvercle de protection au-dessus de la culasse recouvrant le système de retour de carburant sur la culasse entraine la connexion des embouts de retour de carburant d'un injecteur et de la rampe d'injection en coopération avec les embouts de réception de la canalisation.
Advantageously, the fuel return line is part of the protective cover; thus said cover may comprise a tubular protuberance extending from a planar wall of the cover and more precisely from a ceiling of a chamber delimited by the planar wall of the cylinder head and the protective cover which has the shape of a shell with a base substantially rectangular. Thus the cover comprises a return pipe with its return endpieces whose positions are adjusted above the fuel return endpieces of the injection rail and of the at least one injector.
  • the attachment of the protective cover above the cylinder head covering the fuel return system on the cylinder head causes the connection of the fuel return tips of an injector and the injection rail in cooperation with the receiving tips of the channeling.

Brève description des figuresBrief description of figures

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés sur les dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique d'un ensemble d'injection de carburant pour un moteur thermique.
  • la figure 2 est une vue schématique d'un couvercle de protection selon l'invention.
  • la figure 3 est une vue schématique de dessous du couvercle de protection.
  • la figure 4 est une vue schématique de la fixation du dispositif de retour de carburant.
  • la figure 5 est une vue schématique d'une coupe transversale de la fixation du dispositif de retour de carburant.
Other characteristics and advantages of the invention will appear on reading the following description of particular embodiments of the invention given by way of non-limiting examples and represented in the appended drawings, in which:
  • the figure 1 is a schematic view of a fuel injection assembly for a heat engine.
  • the figure 2 is a schematic view of a protective cover according to the invention.
  • the picture 3 is a schematic bottom view of the protective cover.
  • the figure 4 is a schematic view of the attachment of the fuel return device.
  • the figure 5 is a schematic cross-sectional view of the fuel return device attachment.

Description détaillée des figuresDetailed description of figures

Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the following description, identical reference numerals designate identical parts or parts having similar functions.

Les termes supérieur/inférieur se réfèrent à un positionnement en hauteur selon un axe vertical perpendiculaire au plan du véhicule passant par les essieux de roues dudit véhicule.The terms upper/lower refer to a height positioning along a vertical axis perpendicular to the plane of the vehicle passing through the wheel axles of said vehicle.

De manière générale, un moteur thermique ou à combustion interne de véhicule automobile comprend un carter-cylindres surmonté d'une culasse (non représentés), ces deux éléments délimitent des chambres à combustion. Dans la culasse, sont creusés des conduits tubulaires adaptés à loger des injecteurs 11 destinés à envoyer du carburant dans une des chambres de combustion (non représentées). Le carburant est issu d'une rampe d'injection 12 par un tuyau d'alimentation 13 reliant un connecteur de sortie 14 de ladite rampe à un connecteur d'entrée 15 de l'injecteur 11. Le carburant issu de la rampe d'injection est à très haute pression, de l'ordre de 1000 à 3000 bars. Pour assurer le fonctionnement de l'injection, il est nécessaire de disposer d'un circuit de retour de carburant dans lequel la pression du carburant est bien plus basse de l'ordre de 1 à 3 bars. Le circuit de retour de carburant permet la récupération du carburant excédentaire ou des fuites du circuit d'injection. Le combustible retourne par un tube basse pression au réservoir. Avec les injecteurs des systèmes d'injection Diesel et essence modernes, une partie du carburant est utilisée pour commander hydrauliquement la levée de l'aiguille. Lors de l'ouverture de l'injecteur, un débit de commande est donc créé, lequel est évacué dans le circuit de retour. Il ne s'agit donc pas à proprement parler d'un débit de fuite, mais d'un retour de carburant associé au fonctionnement normal de l'injecteur 11. Ledit circuit de retour de carburant comprend un système de retour de carburant 10 agencé sur une paroi supérieure de la culasse.In general, a thermal or internal combustion motor vehicle engine comprises a cylinder block surmounted by a cylinder head (not shown), these two elements delimit combustion chambers. In the cylinder head, are dug tubular ducts adapted to house injectors 11 intended to send fuel into one of the combustion chambers (not shown). The fuel comes from an injection rail 12 via a supply pipe 13 connecting an outlet connector 14 of said rail to an inlet connector 15 of the injector 11. The fuel from the injection rail is at very high pressure, of the order of 1000 to 3000 bars. To ensure the operation of the injection, it is necessary to have a fuel return circuit in which the fuel pressure is much lower, of the order of 1 to 3 bars. The fuel return circuit allows the recovery of excess fuel or leaks from the injection circuit. The fuel returns through a low pressure tube to the tank. With the injectors of modern diesel and gasoline injection systems, part of the fuel is used to hydraulically control the lift of the needle. When the injector opens, a control flow is therefore created, which is discharged into the return circuit. It is therefore not strictly speaking a leak flow, but a fuel return associated with the normal operation of the injector 11. Said fuel return circuit comprises a fuel return system 10 arranged on an upper wall of the cylinder head.

Tel que représenté en figures 2 à 5, le système de retour de carburant comprend une canalisation de retour 50 de carburant fixée parallèlement à une paroi plane 16 d'un couvercle de protection 17, ladite paroi plane forme un plafond d'une chambre délimitée par la paroi supérieure de la culasse et le couvercle, dans laquelle sont agencés la rampe d'injection 12 et les injecteurs 11. Le couvercle de protection 17 est formé par des parois verticales 18, deux parois longitudinales jointes à deux parois transversales, lesdites parois verticales sont surmontées par la paroi plane 16.As depicted in figures 2 to 5 , the fuel return system comprises a fuel return pipe 50 fixed parallel to a flat wall 16 of a protective cover 17, said flat wall forms a ceiling of a chamber delimited by the upper wall of the cylinder head and the cover, in which the injection rail 12 and the injectors 11 are arranged. The protective cover 17 is formed by vertical walls 18, two longitudinal walls joined to two transverse walls, said vertical walls are surmounted by the flat wall 16.

Les injecteurs 11 de carburant selon les différentes figures sont au nombre de quatre mais ce nombre peut varier d'un moteur thermique à un autre en fonction du nombre de cylindres que comprend le moteur thermique.The fuel injectors 11 according to the various figures are four in number but this number can vary from one heat engine to another depending on the number of cylinders that the heat engine comprises.

Les injecteurs sont sensiblement cylindriques et fixés traversant la paroi supérieure de la culasse et présentent une extrémité supérieure émergée 27. Ladite extrémité supérieure comporte le connecteur d'entrée 15 de carburant sensiblement transversal à l'axe de l'injecteur et un embout 19 de retour de carburant. Ledit embout de retour prolonge axialement l'extrémité supérieure de l'injecteur. Selon la figure 5, ledit embout de retour 19 est de type femelle et comprend une cavité cylindrique 20 axiale débouchant de l'extrémité supérieure de l'embout. Un conduit de retour (non représenté) est connecté à cette cavité cylindrique pour le retour de carburant.The injectors are substantially cylindrical and fixed through the upper wall of the cylinder head and have a emerged upper end 27. Said upper end comprises the fuel inlet connector 15 substantially transverse to the axis of the injector and a return end piece 19 fuel. Said return end piece axially extends the upper end of the injector. According to figure 5 , said return fitting 19 is of the female type and comprises an axial cylindrical cavity 20 emerging from the upper end of the fitting. A return conduit (not shown) is connected to this cylindrical cavity for fuel return.

La rampe d'injection 12 est sensiblement tubulaire et repose sur sa longueur sur la paroi supérieure de la culasse. Telle que représentée en figures 1 et 4, elle est cylindrique. Elle comprend des connecteurs de sortie 14, au nombre de quatre selon les figures, chacun des connecteurs de sortie est connecté à un connecteur d'entrée 15 d'un injecteur via le tuyau d'alimentation 13. La rampe d'injection comporte une protubérance cylindrique 22 se terminant par un embout de retour 23 de carburant dirigé selon un axe parallèle à l'axe de l'injecteur qui est vertical et perpendiculaire au plan de la paroi supérieure de la culasse. Selon le mode de réalisation présenté en figures 3 et 4, l'embout de retour de la rampe d'injection est de type mâle et peut comprendre des saillies d'accrochage s'étendant transversalement à l'axe dudit embout et un joint torique agencé à une extrémité libre de l'embout (non représentés).The injection rail 12 is substantially tubular and rests along its length on the upper wall of the cylinder head. As represented in figure 1 and 4 , it is cylindrical. It includes 14 output connectors, at number of four according to the figures, each of the outlet connectors is connected to an inlet connector 15 of an injector via the supply pipe 13. The injection rail comprises a cylindrical protuberance 22 terminating in a return nozzle 23 fuel directed along an axis parallel to the axis of the injector which is vertical and perpendicular to the plane of the upper wall of the cylinder head. According to the embodiment presented in figure 3 and 4 , the injection rail return end piece is of the male type and may comprise hooking projections extending transversely to the axis of said end piece and an O-ring arranged at a free end of the end piece (not shown ).

De manière préférentielle, l'embout de retour de carburant de la rampe d'injection comprend également une cavité cylindrique 24 débouchant en partie supérieure de l'embout. Il peut en être de même pour les dimensions de cette cavité cylindrique 24 avec celles de la cavité cylindrique 20 de l'embout de retour 19 d'injecteur.Preferably, the fuel return nozzle of the injection rail also comprises a cylindrical cavity 24 opening out in the upper part of the nozzle. It can be the same for the dimensions of this cylindrical cavity 24 with those of the cylindrical cavity 20 of the return fitting 19 of the injector.

La canalisation 50 du système 10 de retour de carburant comprend des embouts de réception 24,24' sensiblement cylindriques et s'étendant transversalement à l'axe de la canalisation vers la culasse et adaptés pour coopérer avec l'embout de retour 19 du au-moins un injecteur 11 et de la rampe d'injection 12.The pipe 50 of the fuel return system 10 comprises receiving end pieces 24, 24′ that are substantially cylindrical and extending transversely to the axis of the pipe towards the cylinder head and adapted to cooperate with the return end piece 19 of the other. least one injector 11 and the injection rail 12.

La canalisation 50 comprend ainsi des embouts de réception 24 de type mâle adaptés pour être enfoncés dans les cavités cylindriques des embouts de retour des injecteurs 11. Lesdits embouts de réception 24 peuvent comporter à une extrémité libre des saillies d'accrochage 25 s'étendant transversalement à l'axe de l'embout vers l'extérieur dudit embout de réception, le diamètre extérieur global de l'embout de réception avec lesdites saillies est légèrement supérieur au diamètre intérieur de la cavité cylindrique 24 de l'embout de retour 19 de l'injecteur 11. Les saillies peuvent être associées avec des joints toriques pour permettre une étanchéité fluidique optimale. Chaque embout de réception est agencé pour que l'extrémité inférieure de l'embout de réception soit en vis-à-vis avec la cavité cylindrique de l'embout de retour 19 de l'injecteur. De cette manière l'embout de réception 24 peut être reçu dans la cavité cylindrique de l'embout de retour 19 et former ainsi une connexion rapide par enfoncement. Cette connexion est aussi réversible car au prix d'un petit effort de rétraction, on peut désolidariser facilement l'embout de réception de l'embout de retour des injecteurs 11.The pipe 50 thus comprises reception end pieces 24 of the male type adapted to be pushed into the cylindrical cavities of the return end pieces of the injectors 11. Said reception end pieces 24 may comprise at a free end hooking projections 25 extending transversely to the axis of the tip towards the outside of said receiving tip, the overall outside diameter of the receiving tip with said projections is slightly greater than the inside diameter of the cylindrical cavity 24 of the return tip 19 of the injector 11. The projections can be associated with O-rings to allow optimal fluid sealing. Each receiving end piece is arranged so that the lower end of the receiving end piece faces the cylindrical cavity of the return end piece 19 of the injector. In this way the receiving tip 24 can be received in the cylindrical cavity of the tip of back 19 and thus form a quick push-in connection. This connection is also reversible because at the cost of a small retraction effort, it is possible to easily separate the receiving end piece from the return end piece of the injectors 11.

La canalisation de retour 50 comprend aussi un embout de réception de type femelle 24' pour recevoir l'embout de retour 23 de la rampe d'injection 12. Ledit embout de réception est sensiblement cylindrique comportant un conduit intérieur dont le diamètre est légèrement inférieur au diamètre extérieur de l'embout de retour 23 de la rampe d'injection avec les saillies d'accrochage et le joint torique d'étanchéité. Cet embout de réception 24' est agencé pour que l'extrémité inférieure libre de son conduit intérieur soit en vis-à-vis avec l'embout retour 23 de la rampe d'injection 12. De cette manière, l'embout de retour 23 peut être facilement enfoncé dans le conduit intérieur pour assurer la continuité fluidique du retour de carburant depuis la rampe d'injection. Cette connexion est aussi réversible car au prix d'un petit effort de rétraction, on peut désolidariser facilement l'embout de réception 24' de l'embout de retour de la rampe d'injection 12.The return pipe 50 also includes a female-type receiving end piece 24' to receive the return end piece 23 of the injection manifold 12. Said receiving end piece is substantially cylindrical comprising an inner duct whose diameter is slightly less than the outside diameter of the return fitting 23 of the injection rail with the hooking projections and the sealing O-ring. This receiving end piece 24' is arranged so that the free lower end of its inner duct is facing the return end piece 23 of the injection ramp 12. In this way, the return end piece 23 can be easily pushed into the inner duct to ensure the fluidic continuity of the fuel return from the injection rail. This connection is also reversible because at the cost of a small retraction effort, it is possible to easily separate the reception end piece 24' from the return end piece of the injection rail 12.

De manière préférentielle la profondeur d'enfoncement de l'embout de réception dans l'embout de retour est égale pour les injecteurs et la rampe d'injection. Pour ce faire, on peut avoir les extrémités supérieures des différents embouts de retour 19,23 à un même niveau vertical, de même pour les extrémités inférieures des embouts de réception 24,24' destinés à être connectés par enfoncement l'un dans l'autre selon des connexions rapides de type mâle-femelle réversibles.Preferably, the depth of insertion of the receiving end piece into the return end piece is equal for the injectors and the injection rail. To do this, it is possible to have the upper ends of the various return end pieces 19,23 at the same vertical level, the same for the lower ends of the reception end pieces 24,24' intended to be connected by pushing one into the another according to quick connections of the reversible male-female type.

La hauteur de paroi verticale est de manière préférentielle égale ou légèrement à la hauteur formée par l'assemblage des connexions entre les embouts de réception et de retour en tenant compte naturellement des dimensions de la rampe d'injection et des extrémités des injecteurs émergeant depuis la paroi plane supérieure de la culasse.The height of the vertical wall is preferably equal to or slightly equal to the height formed by the assembly of the connections between the reception and return end fittings, naturally taking into account the dimensions of the injection rail and the ends of the injectors emerging from the upper flat wall of the cylinder head.

De manière préférentielle, la canalisation de retour de carburant traverse une des parois verticales du couvercle de protection et est terminée par un embout de raccordement 26. Ledit embout de raccordement peut être connecté au réservoir de carburant par un tuyau de liaison (non représenté).Preferably, the fuel return pipe passes through one of the vertical walls of the protective cover and is terminated by a connecting piece 26. Said connecting piece can be connected to the fuel tank by a connecting pipe (not shown).

La canalisation de retour de carburant peut aussi comporter une autre sortie traversant une des parois verticales pour être connectée à une pompe à carburant du moteur (non représentée).The fuel return line may also include another outlet passing through one of the vertical walls to be connected to an engine fuel pump (not shown).

La canalisation de retour 50 peut également d'une seule pièce avec le couvercle pour faciliter le montage et réduire le nombre de références des pièces à monter.The return pipe 50 can also be in one piece with the cover to facilitate assembly and reduce the number of part numbers to be assembled.

La connexion de la canalisation de retour 50 avec les embouts de retour 19,24 des injecteurs 11 et de la rampe d'injection 12 est effectuée , selon la revendication 10, avec la fixation du couvercle de protection 17 sur la culasse qui comprend les étapes suivantes :

  • présentation des embouts de réception (24,24') du couvercle de protection (17) en face des embouts de retour (19,23) du au-moins un injecteur (11) et de la rampe (12),
  • emboitements des embouts de réception (24,24') dans les embouts de retour (19,23) de carburant,
  • fixation du couvercle de protection (17) à la culasse avec une poussée du couvercle verticalement pour venir en appui sur la paroi supérieure de la culasse, entrainant simultanément la fermeture des embouts de réception (24,24') dans les embouts de retour de carburant (19,23) suivie du serrage des liaisons filetées disposées en bordure périphérique dudit couvercle en regard avec la culasse.
The connection of the return pipe 50 with the return fittings 19,24 of the injectors 11 and of the injection rail 12 is carried out, according to claim 10, with the fixing of the protective cover 17 on the cylinder head which comprises the steps following:
  • presentation of the receiving ends (24,24') of the protective cover (17) opposite the return ends (19,23) of at least one injector (11) and of the ramp (12),
  • interlocking of the reception end pieces (24,24') in the fuel return end pieces (19,23),
  • fixing of the protective cover (17) to the cylinder head with a push of the cover vertically to come to rest on the upper wall of the cylinder head, simultaneously causing the closure of the reception end pieces (24,24') in the fuel return end pieces (19,23) followed by the tightening of the threaded connections arranged on the peripheral edge of said cover facing the cylinder head.

L'objectif est atteint :
Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cette prise, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes.The goal is reached :
It goes without saying that the invention is not limited solely to the embodiments of this socket, described above by way of examples, on the contrary it encompasses all the variants thereof.

Par exemple, les embouts de retour de la rampe d'injection et des injecteurs peuvent éventuellement être dirigés selon un axe horizontal c'est-à-dire parallèle à la paroi supérieure de la culasse tournés vers un même côté associé à une même paroi verticale du couvercle. Le couvercle sera glissé parallèlement à l'axe des embouts à l'aide de glissières par exemple, puis à l'atteinte d'une butée qui correspond à l'enfoncement des embouts de réception dans les cavités cylindriques des embouts de retour, le couvercle est alors fixé à la culasse par des liaisons filetées.For example, the return nozzles of the injection rail and of the injectors can optionally be directed along a horizontal axis, that is to say parallel to the upper wall of the cylinder head facing the same side associated with the same vertical wall. of the lid. The cover will be slipped parallel to the axis of the end pieces using slides for example, then on reaching a stop which corresponds to the sinking of the reception end pieces into the cylindrical cavities of the return end pieces, the cover is then fixed to the cylinder head by threaded connections.

Claims (10)

  1. High-pressure fuel supply device for a motor vehicle combustion engine, covered by a protective cover (17) which is formed by vertical walls (18) surmounted by a flat wall (16), and comprising an injection rail connected by pipes to at least one injector mounted in a cylinder head of said engine and a fuel return system (10) comprising a duct (50),
    characterized in that the fuel return duct (50) is fixed parallel to the flat wall of the protective cover (17) and comprises a connection to a fuel return end piece (19) of the at least one injector (11), said connection extending transversely to the axis of the duct towards the cylinder head.
  2. Device according to Claim 1, characterized in that the connection of the duct (50) to the return end piece (19) of the at least one injector (11) is a quick and reversible connection.
  3. Device according to either one of Claims 1 or 2, characterized in that the fuel return end piece (19) of the at least one injector (11) is directed along the axis of the at least one cylindrical injector.
  4. Device according to any one of Claims 1 to 3, characterized in that the return duct (50) comprises a connection with a fuel return end piece (23) of the injection rail (12), said connection extending transversely to the axis of the duct (50) towards the cylinder head.
  5. Device according to Claim 4, characterized in that the connection between the return duct (50) and the fuel return end piece (23) of the injection rail (12) is a quick and reversible connection.
  6. Device according to either one of Claims 4 or 5, characterized in that the fuel return end piece (23) of the injection rail is in a direction parallel to the axis of the return end piece (19) of the at least one injector (11) .
  7. Device according to any one of Claims 4 to 6, characterized in that the return duct (50) comprises receiving end pieces (24, 24') able to collaborate with the fuel return end pieces (19, 23) of the at least one injector (11) and of the injection rail (12).
  8. Device according to any one of Claims 1 to 7, characterized in that the return duct (50) opens via a lateral vertical face (18) of the cover by means of a connection end piece (26).
  9. Device according to any one of Claims 1 to 8, characterized in that the return duct (50) is part of the protective cover (17).
  10. Method for fixing a protective cover over a cylinder head covering a high pressure fuel supply device with a fuel return system according to any one of Claims 7 to 9, characterized in that the fixing of the protective cover (17) onto the cylinder head leads to simultaneous connection of the fuel return end pieces (19, 23) of the at least one injector (11) and of the injection rail (12) in collaboration with the receiving end pieces (24, 24') of the return duct (50).
EP18165119.1A 2017-04-13 2018-03-29 Fuel rail cover with fuel return Active EP3388661B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1753268A FR3065262B1 (en) 2017-04-13 2017-04-13 FUEL BAR COVER WITH FUEL RETURN

Publications (2)

Publication Number Publication Date
EP3388661A1 EP3388661A1 (en) 2018-10-17
EP3388661B1 true EP3388661B1 (en) 2022-06-08

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ID=59745995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18165119.1A Active EP3388661B1 (en) 2017-04-13 2018-03-29 Fuel rail cover with fuel return

Country Status (2)

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EP (1) EP3388661B1 (en)
FR (1) FR3065262B1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015087105A1 (en) * 2013-12-13 2015-06-18 Volvo Truck Corporation Cover of an internal combustion engine assembly having a common rail, engine assembly and automotive vehicle including such a cover

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IT1024700B (en) * 1974-10-28 1978-07-20 Fiat Spa IMPROVEMENTS IN THE CYLINDER HEAD FOR INTERNAL COMBUSTION ENGINES OF THE DIESEL CYCLE TYPE
DE9410232U1 (en) * 1994-06-27 1995-11-02 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE4423657C2 (en) * 1994-07-06 1997-10-02 Daimler Benz Ag Actuating device for an engine brake valve of an internal combustion engine
GB9726090D0 (en) * 1997-12-09 1998-02-11 Lucas Ind Plc Fuel system
DE19801171C1 (en) * 1998-01-15 1999-04-15 Daimler Chrysler Ag fuel injector for multiple cylinder internal combustion engine
DE10025043A1 (en) * 2000-05-20 2001-11-22 Bosch Gmbh Robert Fuel return unit of common rail diesel injection system includes conductors in collection block which are connected to injection valves
KR100847057B1 (en) * 2001-01-25 2008-07-17 얀마 가부시키가이샤 Fuel injection nozzle of engine
FR2935027A1 (en) * 2008-08-18 2010-02-19 Renault Sas Pressurized fuel i.e. petrol, injecting circuit for e.g. petrol engine, of motor vehicle, has injection duct to connect outlet orifice of pressurized fuel collecting tank with injection unit, where duct and tank are formed as single piece
JP2014095314A (en) * 2012-11-08 2014-05-22 Honda Motor Co Ltd Cover structure of internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015087105A1 (en) * 2013-12-13 2015-06-18 Volvo Truck Corporation Cover of an internal combustion engine assembly having a common rail, engine assembly and automotive vehicle including such a cover

Also Published As

Publication number Publication date
EP3388661A1 (en) 2018-10-17
FR3065262A1 (en) 2018-10-19
FR3065262B1 (en) 2021-07-30

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