EP1700027B1 - Protective housing for an injection system - Google Patents

Protective housing for an injection system Download PDF

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Publication number
EP1700027B1
EP1700027B1 EP04816546A EP04816546A EP1700027B1 EP 1700027 B1 EP1700027 B1 EP 1700027B1 EP 04816546 A EP04816546 A EP 04816546A EP 04816546 A EP04816546 A EP 04816546A EP 1700027 B1 EP1700027 B1 EP 1700027B1
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EP
European Patent Office
Prior art keywords
cylinder head
cover
injection
protective housing
rail
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.)
Not-in-force
Application number
EP04816546A
Other languages
German (de)
French (fr)
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EP1700027A1 (en
Inventor
Eddie Centoni
Sabine Lavagne D'ortigue
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.)
Renault SAS
Original Assignee
Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1700027A1 publication Critical patent/EP1700027A1/en
Application granted granted Critical
Publication of EP1700027B1 publication Critical patent/EP1700027B1/en
Not-in-force 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
    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a protective housing for an internal combustion engine injection system for motor vehicles.
  • Injection systems of motor vehicles 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.
  • the injection systems comprise an injection rail mounted on the engine cylinder head and located between an injection pump and the injectors. The injection rail is fed under high fuel pressure by the pump and is connected to the injectors by pipes. It thus constitutes a reserve of fuel under pressure and the injectors, at a frequency determined according to the speed of rotation of the engine, inject the fuel into the combustion chambers.
  • a disadvantage of these power systems resides in particular in the nature of the pipe connections, both on the injection rail and on the injectors. These connections are generally screwable and they present risks of leaks. Fuel from these leaks, whether liquid or vaporized, is likely to spill into the engine environment.
  • a problem that arises and that aims to solve the present invention, is then to provide a housing that avoids spraying fuel in the engine environment and is not too bulky.
  • the present invention proposes a protective case for an injection system of an internal combustion engine, said injection system comprising an injection ramp which is fed by a pump and which is connected by pipes. injectors mounted in a cylinder head of said engine, said housing / having a wall whose lower free edges are intended to seal said cylinder head, the case comprising a lower part adapted to form a recuperator and an upper part forming a lid and said wall extending between said injection rail and said cylinder head covering said pipes and said injectors.
  • a feature of the invention lies in the shape of the housing which no longer encompasses the injection rail as encompassed by the devices of the prior art, but whose wall extends between the injection rail and the breech.
  • the injection ramp which, adjacent to the cylinder head occupies a smaller space since it is no longer covered, and the housing simply covers the pipes and injectors. Thanks to this more compact assembly, any leaks on the injection systems on the front of the engines are likely to be confined, which avoids the dispersion of fuel in the engine compartment.
  • said recuperator is mounted floating bearing on said injection rail, so that it does not print any constraint to the injection system and the injection rail allows to maintain it relative to the cylinder head.
  • said lower part defines a first wall portion of said wall of said housing and has said lower free edges, and it extends between said injection rail and said cylinder head.
  • said lower portion has through holes of said conduits and the edge of said through holes and said ramp are sealingly joined by a ramp joint. In this way, no fuel flow is possible between the lower part and the injection manifold from which the pipes open.
  • said cover is removably mounted on said cylinder head and joins said recuperator tightly.
  • the recuperator by sealingly sealing the periphery of the pipes on the injection rail, and the cover joining the cylinder head, the recuperator and the cover being hermetically connected together, the fuel from any leaks in the pipes is likely to be recovered.
  • said cover and said recuperator are adapted to be connected together by snap-fastening, which makes it possible to prevent them from dissociating under the effect of vibrations or shocks and this , by means of a simple and reversible connection.
  • said free bottom edges are equipped with a lip seal, which allows the recuperator to be driven in limited movement relative to the cylinder head on which it applies with said lip seal, without causing it to lose contact and therefore to maintain all the sealing of the recuperator on the cylinder head.
  • the housing comprises an evacuation pipette opening into a lower part.
  • a recovery duct connected to said discharge pipette, it is possible to channel and recover the leakage products to move them away from the engine.
  • the Figure 1 shows in front view the upper part of an internal combustion engine 10.
  • This engine comprises an injection rail 12 which is mounted on a cylinder head 14 by two attachment points 16, 18.
  • a housing 20 consists of two parts, a lower portion 22, forming a recuperator and an upper portion 24 forming a lid.
  • the lower portion 22 has a wall portion extending between the yoke 14 and the injection rail 12 and is covered by the cover 24.
  • FIG. 3 We will refer to the Figure 3 to describe in more detail the housing 20 that is found consisting of its lower portion 22 and the lid 24. Also found on this Figure 3 the yoke 14 in which extends an injector 26, and the injection rail 12 which is mounted on the yoke 14 through the attachment point 16 which appears here.
  • yoke 14 is covered with a cylinder head cover 28 which extends towards the rear of the engine 10.
  • the lower portion 22 has a free lower edge 30 which extends at a distance from a lower portion 31 of said yoke 14.
  • a lip seal 32 is mounted on said bottom edge 30 and sealingly engages the yoke 14. lip of the lip seal 32 being elastically deformable, the seal is retained even when the recuperator 22 is driven in displacement, essentially between a close position and a position away from the cylinder head, obviously within certain limits.
  • the yoke 14 has at least one boss 34 adapted to form the attachment point 16 and which passes through a recess 36 of the recuperator 22.
  • the edge of this recess 36 is provided with a recuperator seal 38 which is applied from sealed way around the boss 34,
  • the recuperator 22 From the boss 34 the recuperator 22 has a portion 40 which extends substantially vertically behind the injection manifold 12, between it and the yoke 14 and which continues with a bearing portion 42, substantially perpendicular to said portion 40 The bearing portion 42 is applied to the injection rail 12 and is secured to it by unrepresented fastening clips.
  • bearing portion 42 has a flange 44 adapted to cooperate with the cover 24 as will be described below.
  • first conduits 46 for connecting the injectors 26 to the injection manifold 12 are connected to the latter by means of connectors 48, four in number on the Figure 2 .
  • the connections are made by means of a tip 50 projecting vertically above the injection rail, which end has a peripheral thread on which a ring 52 is adapted to be screwed.
  • the end of the pipes 46 is provided with a shoulder against which said ring 52 is adapted to bear in order to maintain by force said end in the end piece 50 of the injection rail 12.
  • the bearing portion 42 has passage holes of the pipes 46 whose edges 54 are adapted to be applied in the periphery of the end pieces 50 against the injection ramp 12 and sealingly through a ramp joint 56
  • the ramp seal is made in one piece and it extends over the entire length of the support portion 42 which it follows along the recuperator 22 and holes are provided for each endpiece 50.
  • a central feed nozzle 57 appearing on the Figure 2 , is provided projecting from the injection manifold 12 and is intended to receive a feed conduit from an injection pump not shown, and external to the housing 20.
  • the cover 24 presented a portion recessed not shown and pierced, whose edge is sealingly applied around the central nozzle 57.
  • the central nozzle 57 is thus connected to the supply line outside said housing 20 with means similar to those of other conduits.
  • the cover 24 has a second free edge 58 which is applied on the side of the front face, longitudinally against the flange 44 in a sealed manner with a first cover gasket 60 and the side of the rear face against the head cover 28, sealingly with a second cover seal 62.
  • said second free edge is provided with a single continuous cover seal, which is wedged between the cover 24 and the recuperator 22 substantially for half , including two portions of unrepresented side edges where the rim 44 and the yoke meet, and between the cover 24 and the bolt cover 28 for the other half including the other two side edge portions.
  • the recuperator 22 completely and sealingly isolates the injection ramp 12 from the cylinder head 14 and, on the other hand, the lid 24 completely and also tightly covers the pipes 46 between the rim. 44 and the bolt cover 28.
  • any fuel leakage at the lines 46 and particularly at the connectors 48 is circumscribed within the housing.
  • cover 24 is mounted in a fixed position on the bolt cover 28 by screws not shown while the second free edge 58 is provided with lugs 64 also appearing on the Figure 1 , adapted to be engaged in the slots 66 of resilient tabs 68.
  • cover 24 and the recuperator 22 are integral with each other and they are adapted to be easily connected to one another.
  • FIG. 1 there is shown a discharge pipette 70 in a lower side of the recuperator 22 and which opens inside the housing 20 more precisely between the wall of the collector 22 and the cylinder head wall.
  • this discharge pipette 70 the fuel that escapes from the pipes in liquid form or is vaporized, is likely to be recovered. Given the watertightness that remains between the housing 20 as a whole and the cylinder head 14 any fuel projection due to leaks is on the one hand contained inside the housing 20 and on the other hand likely to be channeled and away from the hot parts of the engine.

Abstract

The casing has a lower part (22) presenting a free lower edge (30), and covered by a cover (24). A wall portion of the lower part extends between a cylinder head (14) and an injection harness (12). An injector (26) extends in the cylinder head. The harness is mounted on the cylinder head by a fixing point (16). The cylinder head (14) is covered by a cover of a cylinder head (28) that extends towards the back of the engine.

Description

La présente invention se rapporte à un boîtier de protection pour un système d'injection de moteur à combustion interne destiné aux véhicules automobiles.The present invention relates to a protective housing for an internal combustion engine injection system for motor vehicles.

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.Injection systems of motor vehicles 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. The injection systems comprise an injection rail mounted on the engine cylinder head and located between an injection pump and the injectors. The injection rail is fed under high fuel pressure by the pump and is connected to the injectors by pipes. It thus constitutes a reserve of fuel under pressure and the injectors, at a frequency determined according to the speed of rotation of the engine, inject the fuel into the combustion chambers.

Un inconvénient de ces systèmes d'alimentation réside notamment dans la nature des raccords des conduites, à la fois sur la rampe d'injection et sur les injecteurs. Ces raccords sont généralement vissables et ils présentent des risques de fuites. Le carburant provenant de ces fuites, liquide ou vaporisé, est susceptible de se répandre dans l'environnement du moteur.A disadvantage of these power systems resides in particular in the nature of the pipe connections, both on the injection rail and on the injectors. These connections are generally screwable and they present risks of leaks. Fuel from these leaks, whether liquid or vaporized, is likely to spill into the engine environment.

Pour prévenir la projection de carburant due aux fuites, il a été imaginé, par exemple dans le document EP 1 172 551 ou le document EP 0 612 921 de recouvrir complètement le système d'injection avec un boîtier en englobant les injecteurs, les conduites et la rampe d'injection.To prevent the projection of fuel due to leaks, it has been imagined, for example in the document EP 1 172 551 or the document EP 0 612 921 completely cover the injection system with a housing including the injectors, lines and the injection rail.

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.However, such a housing is very bulky and it is not suitable for engines where the injection is performed on the front for which the available space is reduced.

Un problème qui se pose et que vise à résoudre la présente invention, est alors de fournir un boîtier qui permette d'éviter les projections de carburant dans l'environnement du moteur et qui ne soit pas trop encombrant.A problem that arises and that aims to solve the present invention, is then to provide a housing that avoids spraying fuel in the engine environment and is not too bulky.

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, le boitier comprenant une partie inférieure adaptée à former un récupérateur et une partie supérieure formant couvercle et ladite paroi s'etendant entre ladite rampe d'injection et ladite culasse en recouvrant lesdites conduites et lesdits injecteurs.For this purpose, the present invention proposes a protective case for an injection system of an internal combustion engine, said injection system comprising an injection ramp which is fed by a pump and which is connected by pipes. injectors mounted in a cylinder head of said engine, said housing / having a wall whose lower free edges are intended to seal said cylinder head, the case comprising a lower part adapted to form a recuperator and an upper part forming a lid and said wall extending between said injection rail and said cylinder head covering said pipes and said injectors.

Ainsi, une caractéristique de l'invention réside dans la forme du boîtier qui n'englobe plus ici la rampe d'injection comme l'englobait les dispositifs de l'art antérieur, mais dont la paroi s'étend entre la rampe d'injection et la culasse. De la sorte, cette rampe d'injection qui elle, jouxte la culasse occupe un espace plus restreint puisqu'elle n'est plus recouverte, et le boîtier recouvre simplement les conduites et les injecteurs. Grâce à ce montage plus compact, les fuites éventuelles sur les systèmes d'injection en face avant des moteurs sont susceptibles d'être confinées, ce qui évite la dispersion du carburant dans le coffre moteur.Thus, a feature of the invention lies in the shape of the housing which no longer encompasses the injection rail as encompassed by the devices of the prior art, but whose wall extends between the injection rail and the breech. In this way, the injection ramp which, adjacent to the cylinder head occupies a smaller space since it is no longer covered, and the housing simply covers the pipes and injectors. Thanks to this more compact assembly, any leaks on the injection systems on the front of the engines are likely to be confined, which avoids the dispersion of fuel in the engine compartment.

De plus, il est plus aisé à installer sur le moteur ; on installe d'abord la partie inférieure et la rampe d'injection puis on recouvre le récupérateur avec le couvercle.In addition, it is easier to install on the engine; first install the lower part and the injection rail and then cover the recuperator with the lid.

De façon particulièrement avantageuse, ledit récupérateur est monté flottant en appui sur ladite rampe d'injection, de sorte qu'il n'imprime aucune contrainte au système d'injection et la rampe d'injection permet de le maintenir par rapport à la culasse.Particularly advantageously, said recuperator is mounted floating bearing on said injection rail, so that it does not print any constraint to the injection system and the injection rail allows to maintain it relative to the cylinder head.

Selon une caractéristique particulière de l'invention, ladite partie inférieure définit une première portion de paroi de ladite paroi dudit boîtier et présente lesdits bords inférieurs libres, et elle s'étend entre ladite rampe d'injection et ladite culasse. Ainsi, au cours du montage, ladite partie inférieure et ladite rampe d'injection sont adaptées à être ajustées ensemble avant d'être montées sur la culasse, ce qui rend le montage plus aisé. Ensuite le couvercle est lui, ajusté sans contact avec la rampe d'injection, directement en joignant le couvercle et la culasse.According to a particular characteristic of the invention, said lower part defines a first wall portion of said wall of said housing and has said lower free edges, and it extends between said injection rail and said cylinder head. Thus, during assembly, said lower part and said injection rail are adapted to be adjusted together before being mounted on the cylinder head, which makes assembly easier. Then the cover is him, adjusted without contact with the injection rail, directly by joining the cover and the cylinder head.

Selon un mode de réalisation préféré, ladite partie inférieure présente des trous de passage desdites conduites et le bord desdits trous de passage et ladite rampe sont joints de façon étanche par un joint de rampe. De la sorte, aucun écoulement de carburant n'est possible entre la partie inférieure et la rampe d'injection de laquelle débouchent les conduites.According to a preferred embodiment, said lower portion has through holes of said conduits and the edge of said through holes and said ramp are sealingly joined by a ramp joint. In this way, no fuel flow is possible between the lower part and the injection manifold from which the pipes open.

En outre, et ce de façon particulièrement avantageuse, ledit couvercle est monté de manière amovible sur ladite culasse et il joint ledit récupérateur de façon étanche. Ainsi, le récupérateur en joignant de façon étanche le pourtour des conduites sur la rampe d'injection, et le couvercle joignant la culasse, le récupérateur et le couvercle étant hermétiquement reliés ensemble, le carburant provenant d'éventuelles fuites au niveau des conduites est susceptible d'être récupéré.In addition, and particularly advantageously, said cover is removably mounted on said cylinder head and joins said recuperator tightly. Thus, the recuperator by sealingly sealing the periphery of the pipes on the injection rail, and the cover joining the cylinder head, the recuperator and the cover being hermetically connected together, the fuel from any leaks in the pipes is likely to be recovered.

Selon un mode avantageux de mise en oeuvre de l'invention, ledit couvercle et ledit récupérateur sont adaptés à être reliés ensemble par encliquetage, ce qui permet d'éviter qu'ils ne se désolidarisent sous l'effet des vibrations ou des chocs et ce, au moyen d'une liaison simple et réversible.According to an advantageous embodiment of the invention, said cover and said recuperator are adapted to be connected together by snap-fastening, which makes it possible to prevent them from dissociating under the effect of vibrations or shocks and this , by means of a simple and reversible connection.

Selon encore un autre mode de mise en oeuvre de l'invention lesdits bords inférieurs libres sont équipés d'un joint à lèvre, ce qui permet au récupérateur d'être entraîné en mouvement limité par rapport à la culasse sur laquelle il s'applique avec ledit joint à lèvre, sans pour autant lui faire perdre contact et donc de conserver toute l'étanchéité du récupérateur sur la culasse.According to yet another embodiment of the invention said free bottom edges are equipped with a lip seal, which allows the recuperator to be driven in limited movement relative to the cylinder head on which it applies with said lip seal, without causing it to lose contact and therefore to maintain all the sealing of the recuperator on the cylinder head.

Par ailleurs, selon encore un mode de réalisation particulier, le boîtier comprend une pipette d'évacuation débouchant dans une partie basse. De la sorte, au moyen d'un conduit de récupération relié à ladite pipette d'évacuation, il est possible de canaliser et de récupérer les produits de fuite pour les éloigner du moteur.Furthermore, according to yet another particular embodiment, the housing comprises an evacuation pipette opening into a lower part. In this way, by means of a recovery duct connected to said discharge pipette, it is possible to channel and recover the leakage products to move them away from the engine.

D'autres particularités et avantages de invention ressortiront à la lecture de la description faite ci-après d'un mode de réalisation particulier de l'invention, donné à titre indicatif mais non limitatif, en référence aux dessins annexés sur lesquels:

  • la Figure 1 est une vue schématique de face d'un moteur à combustion interne en face avant et présentant un boîtier conforme à l'invention;
  • la Figure 2 est une vue schématique en coupe sensiblement verticale et longitudinale du moteur illustré sur la Figure 1 ; et,
  • la Figure 3 est une vue en coupe verticale et transversale selon la coupe III-III illustrée sur la Figure 2.
Other features and advantages of the invention will appear on reading the following description of a particular embodiment of the invention, given by way of indication but not limitation, with reference to the accompanying drawings, in which:
  • the Figure 1 is a schematic front view of an internal combustion engine on the front and having a housing according to the invention;
  • the Figure 2 is a schematic view in substantially vertical and longitudinal section of the engine illustrated on the Figure 1 ; and,
  • the Figure 3 is a vertical cross-sectional view according to section III-III illustrated on the Figure 2 .

La Figure 1 montre en vue de face la partie supérieure d'un moteur à combustion interne 10. Ce moteur comporte une rampe d'injection 12 qui est montée sur une culasse 14 grâce à deux points de fixation 16, 18. En outre, il comprend un boîtier 20 constitué de deux parties, une partie inférieure 22, formant un récupérateur et une partie supérieure 24 formant un couvercle.The Figure 1 shows in front view the upper part of an internal combustion engine 10. This engine comprises an injection rail 12 which is mounted on a cylinder head 14 by two attachment points 16, 18. In addition, it comprises a housing 20 consists of two parts, a lower portion 22, forming a recuperator and an upper portion 24 forming a lid.

La partie inférieure 22 présente une portion de paroi qui s'étend entre la culasse 14 et la rampe d'injection 12 et elle est recouverte par le couvercle 24.The lower portion 22 has a wall portion extending between the yoke 14 and the injection rail 12 and is covered by the cover 24.

On se référera à la Figure 3 pour décrire plus en détail le boîtier 20 que l'on retrouve constitué de sa partie inférieure 22 et du couvercle 24. On retrouve également sur cette Figure 3 la culasse 14 dans laquelle s'étend un injecteur 26, et la rampe d'injection 12 qui est montée sur la culasse 14 grâce au point de fixation 16 qui apparaît ici.We will refer to the Figure 3 to describe in more detail the housing 20 that is found consisting of its lower portion 22 and the lid 24. Also found on this Figure 3 the yoke 14 in which extends an injector 26, and the injection rail 12 which is mounted on the yoke 14 through the attachment point 16 which appears here.

En outre, la culasse 14 est recouverte d'un couvercle de culasse 28 qui s'étend vers l'arrière du moteur 10.In addition, the yoke 14 is covered with a cylinder head cover 28 which extends towards the rear of the engine 10.

La partie inférieure 22 présente un bord inférieur libre 30 qui s'étend à distance d'une partie basse 31 de ladite culasse 14. Un joint à lèvre 32 est monté sur ledit bord inférieur 30 et il joint de façon étanche la culasse 14. La lèvre du joint à lèvre 32 étant élastiquement déformable, l'étanchéité est conservée même quand le récupérateur 22 est entraîné en déplacement, essentiellement entre une position rapprochée et une position écartée de la culasse, bien évidemment dans certaines limites.The lower portion 22 has a free lower edge 30 which extends at a distance from a lower portion 31 of said yoke 14. A lip seal 32 is mounted on said bottom edge 30 and sealingly engages the yoke 14. lip of the lip seal 32 being elastically deformable, the seal is retained even when the recuperator 22 is driven in displacement, essentially between a close position and a position away from the cylinder head, obviously within certain limits.

Par ailleurs, la culasse 14 présente au moins un bossage 34 adapté à former le point de fixation 16 et qui traverse un évidement 36 du récupérateur 22. Le bord de cet évidement 36 est muni d'un joint de récupérateur 38 qui s'applique de façon étanche autour du bossage 34,Furthermore, the yoke 14 has at least one boss 34 adapted to form the attachment point 16 and which passes through a recess 36 of the recuperator 22. The edge of this recess 36 is provided with a recuperator seal 38 which is applied from sealed way around the boss 34,

A partir du bossage 34 le récupérateur 22 présente une portion 40 qui s'étend sensiblement verticalement derrière la rampe d'injection 12, entre elle et la culasse 14 puis qui se poursuit par une partie d'appui 42, sensiblement perpendiculaire à ladite portion 40. La partie d'appui 42 s'applique sur la rampe d'injection 12 et y est solidarisée par des clips de fixation non représentés.From the boss 34 the recuperator 22 has a portion 40 which extends substantially vertically behind the injection manifold 12, between it and the yoke 14 and which continues with a bearing portion 42, substantially perpendicular to said portion 40 The bearing portion 42 is applied to the injection rail 12 and is secured to it by unrepresented fastening clips.

En outre, la partie d'appui 42 présente un rebord 44 adapté à coopérer avec le couvercle 24 comme on le décrira ci-après.In addition, the bearing portion 42 has a flange 44 adapted to cooperate with the cover 24 as will be described below.

On décrira au préalable, la coopération de la partie d'appui 42 avec la rampe d'injection 12 sur laquelle elle s'appuie, en référence à la Figure 3 et à la Figure 2. La Figure 2 correspondant à la coupe selon le plan II-II illustré sur la Figure 3 et réciproquement, la Figure 3 correspondant à la coupe selon le plan III-III illustré sur la Figure 2.The cooperation of the support part 42 with the injection ramp 12 on which it is based will be described in advance, with reference to the Figure 3 and at the Figure 2 . The Figure 2 corresponding to the cut according to plan II-II illustrated on the Figure 3 and conversely, the Figure 3 corresponding to the section according to the plan III-III illustrated on the Figure 2 .

En effet, des premières conduites 46 destinées à relier les injecteurs 26 à la rampe d'injection 12 sont raccordées à cette dernière par l'intermédiaire de raccords 48, au nombre de quatre sur la Figure 2. Les raccords sont réalisés grâce à un embout 50 en saillie verticale au-dessus de la rampe d'injection, lequel embout présente un filetage périphérique sur lequel une bague 52 est adaptée à venir se visser. L'extrémité des conduites 46 est munie d'un épaulement contre lequel ladite bague 52 est adaptée à prendre appui pour maintenir à force ladite extrémité dans l'embout 50 de la rampe d'injection 12.Indeed, first conduits 46 for connecting the injectors 26 to the injection manifold 12 are connected to the latter by means of connectors 48, four in number on the Figure 2 . The connections are made by means of a tip 50 projecting vertically above the injection rail, which end has a peripheral thread on which a ring 52 is adapted to be screwed. The end of the pipes 46 is provided with a shoulder against which said ring 52 is adapted to bear in order to maintain by force said end in the end piece 50 of the injection rail 12.

La partie d'appui 42 présente des trous de passage des conduites 46 dont les bords 54 sont adaptés à venir s'appliquer dans le pourtour des embouts 50 contre la rampe d'injection 12 et ce de façon étanche grâce à un joint de rampe 56. Avantageusement, le joint de rampe est réalisé d'une seule pièce et il s'étend sur toute la longueur de la partie d'appui 42 qui elle, longe le récupérateur 22 et des orifices sont ménagés pour chaque embout 50.The bearing portion 42 has passage holes of the pipes 46 whose edges 54 are adapted to be applied in the periphery of the end pieces 50 against the injection ramp 12 and sealingly through a ramp joint 56 Advantageously, the ramp seal is made in one piece and it extends over the entire length of the support portion 42 which it follows along the recuperator 22 and holes are provided for each endpiece 50.

Un embout central 57 d'alimentation, apparaissant sur la Figure 2, est ménagé en saillie de la rampe d'injection 12 et il est destiné à recevoir un conduit d'alimentation provenant d'une pompe d'injection non représentée, et extérieure au boîtier 20. Pour ce faire, le couvercle 24 présenté une portion enfoncée non représentée et percée, dont le bord vient s'appliquer de façon étanche autour de l'embout central 57. L'embout central 57 est ainsi raccordé à la conduite d'alimentation en dehors dudit boîtier 20 avec des moyens analogues à ceux des autres conduites.A central feed nozzle 57, appearing on the Figure 2 , is provided projecting from the injection manifold 12 and is intended to receive a feed conduit from an injection pump not shown, and external to the housing 20. To do this, the cover 24 presented a portion recessed not shown and pierced, whose edge is sealingly applied around the central nozzle 57. The central nozzle 57 is thus connected to the supply line outside said housing 20 with means similar to those of other conduits.

Par ailleurs, le couvercle 24 présente un second bord libre 58 qui s'applique, du côté de la face avant, longitudinalement contre le rebord 44 de façon étanche grâce à un premier joint de couvercle 60 et du côté de la face arrière, contre le couvercle de culasse 28, de façon étanche grâce à un deuxième joint de couvercle 62. De façon pratique, ledit second bord libre est muni d'un seul joint de couvercle continu, qui est coincé entre le couvercle 24 et le récupérateur 22 sensiblement pour moitié, y compris deux parties de bords latéraux non représentés où se rejoignent le rebord 44 et la culasse, et entre le couvercle 24 et le couvercle de culasse 28 pour l'autre moitié en incluant les deux autres parties de bords latéraux.Furthermore, the cover 24 has a second free edge 58 which is applied on the side of the front face, longitudinally against the flange 44 in a sealed manner with a first cover gasket 60 and the side of the rear face against the head cover 28, sealingly with a second cover seal 62. Conveniently, said second free edge is provided with a single continuous cover seal, which is wedged between the cover 24 and the recuperator 22 substantially for half , including two portions of unrepresented side edges where the rim 44 and the yoke meet, and between the cover 24 and the bolt cover 28 for the other half including the other two side edge portions.

De la sorte, d'une part le récupérateur 22 isole complètement et de façon étanche, la rampe d'injection 12 de la culasse 14 et d'autre part, le couvercle 24 recouvre entièrement et également de façon étanche les conduites 46 entre le rebord 44 et le couvercle de culasse 28. Ainsi, toute fuite de carburant au niveau des conduites 46 et particulièrement au niveau des raccords 48 est circonscrite à l'intérieur du boîtier.In this way, on the one hand, the recuperator 22 completely and sealingly isolates the injection ramp 12 from the cylinder head 14 and, on the other hand, the lid 24 completely and also tightly covers the pipes 46 between the rim. 44 and the bolt cover 28. Thus, any fuel leakage at the lines 46 and particularly at the connectors 48 is circumscribed within the housing.

En outre, le couvercle 24 est monté en position fixe sur le couvercle de culasse 28 par des vis non représentées tandis que le second bord libre 58 est muni d'ergots 64 apparaissant également sur la Figure 1, adaptés à être engagés dans les lumières 66 de pattes élastiques 68. Ainsi, le couvercle 24 et le récupérateur 22 sont solidaires l'un de l'autre et ils sont adaptés à être reliés aisément l'un à l'autre.In addition, the cover 24 is mounted in a fixed position on the bolt cover 28 by screws not shown while the second free edge 58 is provided with lugs 64 also appearing on the Figure 1 , adapted to be engaged in the slots 66 of resilient tabs 68. Thus, the cover 24 and the recuperator 22 are integral with each other and they are adapted to be easily connected to one another.

De plus, sur cette Figure 1, on a représenté une pipette d'évacuation 70 dans une partie latérale basse du récupérateur 22 et qui débouche à l'intérieur du boîtier 20 plus précisément entre la paroi du récupérateur 22 et la paroi de culasse. Grâce à cette pipette d'évacuation 70, le carburant qui s'échappe des conduites sous forme liquide ou qui est vaporisé, est susceptible d'être récupéré. Compte tenu de l'étanchéité qui subsiste entre le boîtier 20 dans son ensemble et la culasse 14 toute projection de carburant due à des fuites est d'une part contenue à l'intérieur du boîtier 20 et d'autre part susceptible d'être canalisée et éloignée des parties chaudes du moteur.Moreover, on this Figure 1 , there is shown a discharge pipette 70 in a lower side of the recuperator 22 and which opens inside the housing 20 more precisely between the wall of the collector 22 and the cylinder head wall. With this discharge pipette 70, the fuel that escapes from the pipes in liquid form or is vaporized, is likely to be recovered. Given the watertightness that remains between the housing 20 as a whole and the cylinder head 14 any fuel projection due to leaks is on the one hand contained inside the housing 20 and on the other hand likely to be channeled and away from the hot parts of the engine.

Claims (8)

  1. Protective housing for an injection system for an internal-combustion engine (10), said injection system comprising an injection rail (12) supplied by a pump and connected by pipes to injectors (26) mounted in a cylinder head (14) on said engine, said housing comprising a wall whose free lower edges (30) are designed to be sealed to said cylinder head (14),
    characterized in that it comprises a lower part (22) suitable for forming a collector (22), and an upper part (24) forming a cover,
    and in that said wall (24) of said housing extends between said injection rail (12) and said cylinder head (14) in such a way as to cover said pipes (46) and said injectors (26).
  2. Protective housing according to Claim 1, characterized in that said collector (22) rests loosely on said injection rail (12).
  3. Protective housing according to Claim 1 or 2, characterized in that said lower part (22) defines a first wall portion (40) of said wall of said housing and comprises said free lower edges (30), and in that said first wall portion (40) extends between said injection rail (12) and said cylinder head (14).
  4. Protective housing according to any one of Claims 1 to 3, characterized in that said lower part (22) has holes for the passage of said pipes and in that the edges (54) of said through holes are sealed to said rail (12) by a rail seal (56).
  5. Protective housing according to any one of Claims 1 to 4, characterized in that said cover (24) is mounted removably on said cylinder head (14) and in that it is sealed to said collector (22).
  6. Protective housing according to any one of Claims 1 to 5, characterized in that said cover (24) and said collector (22) are suitable for connecting together by snap fastening.
  7. Protective housing according to any one of Claims 1 to 6, characterized in that said free lower edges (30) are provided with a lip seal.
  8. Protective housing according to any one of Claims 1 to 7, characterized in that it includes a discharge pipette (70) communicating with a low part.
EP04816546A 2003-12-23 2004-12-15 Protective housing for an injection system Not-in-force EP1700027B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315310A FR2864171B1 (en) 2003-12-23 2003-12-23 HOUSING FOR PROTECTING AN INJECTION SYSTEM
PCT/FR2004/050692 WO2005064146A1 (en) 2003-12-23 2004-12-15 Protective housing for an injection system

Publications (2)

Publication Number Publication Date
EP1700027A1 EP1700027A1 (en) 2006-09-13
EP1700027B1 true EP1700027B1 (en) 2010-03-03

Family

ID=34630532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04816546A Not-in-force EP1700027B1 (en) 2003-12-23 2004-12-15 Protective housing for an injection system

Country Status (5)

Country Link
EP (1) EP1700027B1 (en)
AT (1) ATE459799T1 (en)
DE (1) DE602004025850D1 (en)
FR (1) FR2864171B1 (en)
WO (1) WO2005064146A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2910073A1 (en) 2006-12-18 2008-06-20 Renault Sas Injector protecting device for internal combustion engine, has screen protection part forming edge on portion of screen fixation part by extending perpendicularly above fixation part so as to cover part of injector
FR2910562A1 (en) 2006-12-20 2008-06-27 Renault Sas Fixation support for fuel injector of internal combustion engine, has mounting plate possessing support fixation unit on bend pipe of engine, and main body housing injector, where part forms protection screen of injector
FR3054859B1 (en) * 2016-08-05 2020-02-14 Peugeot Citroen Automobiles Sa HEAD COVER OF A VEHICLE ENGINE
FR3076579B1 (en) * 2018-01-08 2020-02-14 Robert Bosch Gmbh DEVICE FOR SEALED CONNECTION OF THE HIGH PRESSURE PIPE CONNECTING THE HIGH PRESSURE PUMP TO THE COMMON INJECTION RAMP OF AN INTERNAL COMBUSTION ENGINE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297523A (en) * 1993-02-26 1994-03-29 Caterpillar Inc. Tuned actuating fluid inlet manifold for a hydraulically-actuated fuel injection system
GB2337082A (en) * 1998-05-09 1999-11-10 Perkins Engines Co Ltd An i.c engine fuel injection system having a reservoir for actuating fluid
EP1172551B1 (en) 2000-07-11 2005-11-16 Hino Motors, Ltd. Fuel supply system of diesel engine

Also Published As

Publication number Publication date
WO2005064146A1 (en) 2005-07-14
FR2864171B1 (en) 2007-08-31
EP1700027A1 (en) 2006-09-13
DE602004025850D1 (en) 2010-04-15
ATE459799T1 (en) 2010-03-15
FR2864171A1 (en) 2005-06-24

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