EP1794440A1 - Device for connecting a high pressure fuel tube - Google Patents

Device for connecting a high pressure fuel tube

Info

Publication number
EP1794440A1
EP1794440A1 EP05778668A EP05778668A EP1794440A1 EP 1794440 A1 EP1794440 A1 EP 1794440A1 EP 05778668 A EP05778668 A EP 05778668A EP 05778668 A EP05778668 A EP 05778668A EP 1794440 A1 EP1794440 A1 EP 1794440A1
Authority
EP
European Patent Office
Prior art keywords
connector
tube
ramp
whose
high pressure
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.)
Withdrawn
Application number
EP05778668A
Other languages
German (de)
French (fr)
Inventor
Thomas Peter Kenny
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.)
Senior Automotive Blois Sas
Original Assignee
Senior Automotive Blois Sas
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Senior Automotive Blois Sas filed Critical Senior Automotive Blois Sas
Publication of EP1794440A1 publication Critical patent/EP1794440A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02M55/02—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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/004—Joining to walls at other than 90 degrees
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
    • F16L41/086—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe fixed with screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
    • F16L41/14—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe by screwing an intermediate part against the inside or outside of the wall

Definitions

  • the invention relates to a connection device between a high-pressure fuel tube and a common rail of a fuel injection system for a heat engine.
  • a high pressure pump sends fuel under pressure through an injection tube to this common rail: it serves as a pressure accumulator and distributor to the tubes that bring the fuel under pressure to the injectors.
  • connection of the high pressure fuel tubes to the ramp is either directly on the body of the ramp, by contact with the tube end on the ramp, or via an intermediate piece called connector.
  • the intermediate piece system functions as a conventional high pressure hydraulic connection.
  • a hollow intermediate piece of revolution is guided on its outer diameter inside a threaded connection.
  • the tightening of a nut generates a tension which is transmitted by the intermediate piece.
  • the two ends of the intermediate piece then each provide a seal, one on the contact with the tube and the other on the contact with the connector.
  • US-6,609,502-B is described an improvement for such a common rail injection system, which comprises an intermediate piece disposed in a connector located at each stitching of the common rail; this piece has the general shape of a hollow cylinder with two conical ends which cooperate with corresponding surfaces disposed at the end of the high pressure tube and the stitching of the common rail.
  • connection comprises an external thread, which cooperates with the internal thread of a nut so that the high pressure tube is clamped by its free end against the intermediate piece and the latter against the common rail.
  • the tube can not then be mounted with an inclination with respect to the intermediate part, otherwise the sealing surfaces will not be properly touched, thus risk of leakage.
  • the sealed connection between the intermediate piece and the ramp is provided by the pressure of a conical shape at the end of the intermediate piece against a conical receptacle of the body of the ramp.
  • the intermediate piece can not therefore not be inclined with respect to the ramp, under penalty of leakage. It must therefore be precisely guided in its outer diameter by the inside diameter of the welded connection. It must also be precisely centered with respect to the axis of the conical receptacle on the body of the ramp, also under penalty of poor contact sealing surfaces and leakage.
  • the fitting which guides and which centers the intermediate part must also be perfectly concentric with the axis of the conical receptacle of the ramp.
  • Another object of the invention is to provide such a device which makes it easy and inexpensive to integrate a calibrated nozzle required in certain injection systems.
  • a further object of the invention is to provide such a device which can be produced industrially at low cost and which has a simplicity of manufacture and assembly.
  • a connecting device between a high pressure fuel tube and a common rail of a fuel injection system for a heat engine comprising a intermediate piece which is arranged in a connection secured to the common rail at each branch which is formed in its wall and comprises a conical flare whose base is turned towards the outside of the ramp, and which comprises, on the one hand , a connector which has an inner channel, which is arranged in the connection, and whose upper end cooperates with the end of the tube and whose lower end cooperates with the conical flare, and, secondly, a nut which consists of a collar, the outer edge is extended of a skirt, and is retained at the corresponding end of the tube by the shoulder of a bulge that comprises the latter and cooperates with the connector, which device is characterized, according to the present invention, by the fact that the diameter The interior of the connector is substantially greater than the outer diameter of the connector, over the entire length of the latter, allowing a tilting of the connector with an always optimum
  • the bulge is of spherical shape and the lower part of the free edge of the collar of the nut is conical.
  • the inner channel comprises at its end directed towards the high pressure tube a conical flare and the end of the tube is spherical.
  • the lower end of the connector is spherical.
  • the inner channel of the connector comprises a nozzle.
  • a connection device between a high-pressure fuel pipe 1 and a common rail 2 of a fuel injection system for a heat engine comprises in particular an intermediate part designated as a whole by the reference 3.
  • the common rail 2 has on its wall 2a, preferably on the same generator, tappings 4 for communicating the outside of this ramp with the interior thereof.
  • Each stitch 4 comprises a conical receptacle 5 whose base is turned towards the outside of the ramp and whose apex is extended by a duct 6 opening into the interior of this ramp 2.
  • the high pressure tube 1 has at its end 7 of spherical shape, directed towards the stitch 4, a bulge 8. This bulge is generally spherical shape: the upper shoulder 8a thus formed is convex.
  • the intermediate part 3 comprises, on the one hand, a connector 9 and, on the other hand, means for securing it to the high-pressure tube 1 and the ramp 2.
  • the connector 9 is a hollow part of revolution whose upper end 10 cooperates with the end 7 of the high pressure tube 1 and whose lower end 11 cooperates with the conical receptacle 5 of the ramp 2, and which comprises an internal channel 12.
  • the inner channel 12 comprises, at the end directed towards the high-pressure tube 1, a conical flare 13. It may also comprise a nozzle 14, which can open, as in the present embodiment, directly into the conical receptacle 5.
  • the lower end 11 of the connector 9 is of spherical shape and bears against the conical receptacle 5 of the ramp 2: not only is thus made a sealed connection at this level, but also a ball joint which allows a free inclination of the connector 9 with an always optimum contact between him and the ramp 2 for sealing.
  • the conical flare 13 of the inner channel 12 cooperates with the spherical lower end 7 of the high-pressure tube 1: thus, at this level, a ball joint is made which allows a free inclination of the high-pressure tube 1 with an always optimum contact between him and the connector 9 for sealing
  • the means for securing the connector 9 to the high pressure tube 1 and the ramp 2 consist of a connector 15 and a nut 16.
  • the connector 15 is a part of revolution presenting inside a large axial duct 17 for the housing of the connector 9.
  • the diameter of this axial duct 17, or inner diameter of the connector 15, is greater than that of the connector 9 over the entire length. of it, so that there is a play between these two parts during their assembly.
  • This game will allow the contact between the end 11 of the connector 9 is always optimum with the stitch 4 of the ramp 2, regardless of the inclination of the connector. This inclination is made necessary by the concentricity defects, on the one hand, between the connector 15 and the conical receptacle 5 formed in the body of the ramp 2, and, on the other hand, between the various contacts of the connection assembly.
  • This connector 15 is provided with an external thread 18 towards its upper part, and it is welded on the ramp 2.
  • the nut 16 has a collar 19 extended by a skirt 20 threaded internally.
  • the flange 19 cooperates with the bulge 8.
  • the lower part 19a of the free edge of the collar 19 is of conical shape and cooperates with the upper shoulder 8a of the spherical bulge 8.
  • the internal thread of the skirt 20 cooperates with the external thread 18 of the fitting 15.
  • connection 15 is welded so that its vertical axis of symmetry is substantially coincident with that of the tapping .
  • the high pressure tube 1 is provided with the nut 16, the latter being retained by its collar 19 on the bulge 8, and the nut 16 is screwed onto the connector 15: due to the pressure exerted by the face concave 19a on the convex shoulder 8a, the high pressure tube 1 is placed coaxially with the stitch 4 and the connector 9.
  • the connector 9 is made of a harder material than the other parts constituting the connection device according to the present invention.
  • the deformations on the connector 9 are zero or, at the very least, negligible.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The inventive device comprises an intermediate part disposed in a junction (15) fixed to a common rail (2) at each connection (4) which is arranged in a wall (2a) and comprises a conical flare (5) whose base is oriented towards the outside of said rail (2) and comprises a connector (9) which is provided with an internal channel (12) is arranged in the junction (15) and whose top end (10) interacts with the end (7) of the tube (1) and whose low end (11) interacts with said conical flare (5). The inventive device also comprises a nut (16) consisting of a flange (19) whose external edge is extended by a skirt (20) and retained on the corresponding end of the tube (1) by the collar (8a) of a bulge (8) provided therewith and interacting with the junction (15), wherein the diameter of said junction (15) is substentially greater than the external diameter of the connector (9). Said invention can be used for thermal engines.

Description

DISPOSITIF DE CONNEXION D ' UN TUBE DE CARBURANT HAUTE PRESSION DEVICE FOR CONNECTING A HIGH PRESSURE FUEL TUBE
L'invention concerne un dispositif de connexion entre un tube de carburant haute pression et une rampe commune d'un système d'injection de carburant pour un moteur thermique.The invention relates to a connection device between a high-pressure fuel tube and a common rail of a fuel injection system for a heat engine.
Dans un système d'injection à rampe commune, une pompe haute pression envoie du carburant sous pression à travers un tube d'injection vers cette rampe commune : celle-ci sert d'accumulateur de pression et de distributeur vers des tubes qui amènent le carburant sous pression jusqu'aux injecteurs.In a common rail injection system, a high pressure pump sends fuel under pressure through an injection tube to this common rail: it serves as a pressure accumulator and distributor to the tubes that bring the fuel under pressure to the injectors.
La connexion des tubes de carburant haute pression sur la rampe se fait soit directement sur le corps de la rampe, par contact de l'embout du tube sur la rampe, soit par l'intermédiaire d'une pièce intermédiaire dénommée connecteur.The connection of the high pressure fuel tubes to the ramp is either directly on the body of the ramp, by contact with the tube end on the ramp, or via an intermediate piece called connector.
Le système par pièce intermédiaire fonctionne comme une connexion hydraulique haute pression classique. Une pièce intermédiaire creuse de révolution est guidée sur son diamètre extérieur à l'intérieur d'un raccord fileté. Le serrage d'un écrou génère une tension qui se transmet par la pièce intermédiaire. Les deux extrémités de la pièce intermédiaire assure alors chacune une étanchéité, une sur le contact avec le tube et l'autre sur le contact avec le raccord. Dans le document US-6.609.502-B est décrit un perfectionnement pour un tel système d'injection à rampe commune, qui comprend une pièce intermédiaire disposée dans un raccord situé au niveau de chaque piquage de la rampe commune ; cette pièce a la forme générale d'un cylindre creux avec deux extrémités coniques qui coopèrent avec des surfaces correspondantes disposées à l'extrémité du tube haute pression et du piquage de la rampe commune. De plus, le raccord comporte un filetage extérieur, qui coopère avec le filetage intérieur d'un écrou de telle sorte que le tube haute pression est serré par son extrémité libre contre la pièce intermédiaire et cette dernière contre la rampe commune. Le tube ne peut alors pas être monté avec une inclinaison par rapport à la pièce intermédiaire, sous peine de mauvais contact des surfaces d'étanchéité donc risque de fuite.The intermediate piece system functions as a conventional high pressure hydraulic connection. A hollow intermediate piece of revolution is guided on its outer diameter inside a threaded connection. The tightening of a nut generates a tension which is transmitted by the intermediate piece. The two ends of the intermediate piece then each provide a seal, one on the contact with the tube and the other on the contact with the connector. In US-6,609,502-B is described an improvement for such a common rail injection system, which comprises an intermediate piece disposed in a connector located at each stitching of the common rail; this piece has the general shape of a hollow cylinder with two conical ends which cooperate with corresponding surfaces disposed at the end of the high pressure tube and the stitching of the common rail. In addition, the connection comprises an external thread, which cooperates with the internal thread of a nut so that the high pressure tube is clamped by its free end against the intermediate piece and the latter against the common rail. The tube can not then be mounted with an inclination with respect to the intermediate part, otherwise the sealing surfaces will not be properly touched, thus risk of leakage.
La liaison étanche entre la pièce intermédiaire et la rampe est assurée par la pression d'une forme conique en bout de la pièce intermédiaire contre un réceptacle conique du corps de la rampe. La pièce intermédiaire ne peut donc pas être inclinée par rapport à la rampe, sous peine de risque de fuites. Elle doit donc être précisément guidée en son diamètre extérieur par le diamètre intérieur du raccord soudé. Elle doit également être très précisément centrée par rapport à l'axe du réceptacle conique sur le corps de la rampe, également sous peine d'un mauvais contact des surfaces d'étanchéité donc de fuite. Le raccord qui guide et qui centre la pièce intermédiaire, doit lui aussi être parfaitement concentrique à l'axe du réceptacle conique de la rampe.The sealed connection between the intermediate piece and the ramp is provided by the pressure of a conical shape at the end of the intermediate piece against a conical receptacle of the body of the ramp. The intermediate piece can not therefore not be inclined with respect to the ramp, under penalty of leakage. It must therefore be precisely guided in its outer diameter by the inside diameter of the welded connection. It must also be precisely centered with respect to the axis of the conical receptacle on the body of the ramp, also under penalty of poor contact sealing surfaces and leakage. The fitting which guides and which centers the intermediate part, must also be perfectly concentric with the axis of the conical receptacle of the ramp.
Lors du serrage de l'écrou du tube la pression du tube sur la pièce intermédiaire déforme légèrement le diamètre extérieur de cette pièce. Dans le cas d'un centrage et guidage précis entre la pièce intermédiaire et le raccord soudé, cette augmentation de diamètre de la pièce intermédiaire induit un coincement de la pièce dans le raccord dès le début du serrage : le libre coulissement de la pièce intermédiaire n'est plus garanti et la tension de contact entre la pièce intermédiaire et le corps de la rampe est amoindrie avec pour conséquence un risque de fuite.When tightening the tube nut the pressure of the tube on the intermediate piece slightly deforms the outside diameter of this part. In the case of a precise centering and guiding between the intermediate piece and the welded connection, this increase in the diameter of the intermediate piece induces jamming of the piece in the fitting from the beginning of the clamping: the free sliding of the intermediate piece n is more guaranteed and the contact voltage between the intermediate piece and the body of the ramp is reduced with the consequence of a risk of leakage.
Aussi un des buts de la présente invention est-il de fournir un dispositif perfectionné de connexion entre un tube haute pression et une rampe commune d'un système d'injection de carburant pour moteur thermique, qui permet d'obvier les inconvénients ci-dessus et, en particulier, d'accepter des défauts de conicité et/ou de concentricitéIt is also an object of the present invention to provide an improved connection device between a high pressure tube and a common rail of a fuel injection system for a heat engine, which overcomes the above disadvantages. and, in particular, to accept taper and / or concentricity defects
Un autre but de l'invention est de fournir un tel dispositif qui permet d'intégrer facilement et à faible coût un gicleur calibré nécessaire dans certains systèmes d'injection. Un but supplémentaire de l'invention est de fournir un tel dispositif qui peut être réalisé industriellement à faible coût et qui présente une simplicité de fabrication et de montage.Another object of the invention is to provide such a device which makes it easy and inexpensive to integrate a calibrated nozzle required in certain injection systems. A further object of the invention is to provide such a device which can be produced industrially at low cost and which has a simplicity of manufacture and assembly.
Ces buts, ainsi que d'autres qui apparaîtront par la suite, sont atteints par un dispositif de connexion entre un tube de carburant haute pression et une rampe commune d'un système d'injection de carburant pour un moteur thermique, du genre comprenant une pièce intermédiaire qui est disposée dans un raccord solidaire de la rampe commune au niveau de chaque piquage qui est ménagé dans sa paroi et comprend un évasement conique dont la base est tournée vers l'extérieur de la rampe, et qui comprend, d'une part, un connecteur qui comporte un canal intérieur, qui est disposé dans le raccord, et dont l'extrémité supérieure coopère avec l'extrémité du tube et dont l'extrémité inférieure coopère avec l'évasement conique, et, d'autre part, un écrou qui est constitué d'une collerette, dont le bord extérieur est prolongé d'une jupe, et est retenu à l'extrémité correspondante du tube par l'épaulement d'un renflement que comporte ce dernier et coopère avec le raccord, lequel dispositif est caractérisé, selon la présente invention, par le fait que le diamètre intérieur du raccord est sensiblement supérieur au diamètre extérieur du connecteur, sur toute la longueur de ce dernier, permettant une inclinaison du connecteur avec un contact toujours optimum entre lui et la rampe pour l'étanchéité.These and other objects that will become apparent are achieved by a connecting device between a high pressure fuel tube and a common rail of a fuel injection system for a heat engine, of the kind comprising a intermediate piece which is arranged in a connection secured to the common rail at each branch which is formed in its wall and comprises a conical flare whose base is turned towards the outside of the ramp, and which comprises, on the one hand , a connector which has an inner channel, which is arranged in the connection, and whose upper end cooperates with the end of the tube and whose lower end cooperates with the conical flare, and, secondly, a nut which consists of a collar, the outer edge is extended of a skirt, and is retained at the corresponding end of the tube by the shoulder of a bulge that comprises the latter and cooperates with the connector, which device is characterized, according to the present invention, by the fact that the diameter The interior of the connector is substantially greater than the outer diameter of the connector, over the entire length of the latter, allowing a tilting of the connector with an always optimum contact between him and the ramp for sealing.
Avantageusement, le renflement est de forme sphérique et la partie inférieure du bord libre de la collerette de l'écrou est conique.Advantageously, the bulge is of spherical shape and the lower part of the free edge of the collar of the nut is conical.
De préférence, le canal intérieur comprend à son extrémité dirigée vers le tube haute pression un évasement conique et l'extrémité du tube est sphérique.Preferably, the inner channel comprises at its end directed towards the high pressure tube a conical flare and the end of the tube is spherical.
Avantageusement, l'extrémité inférieure du connecteur est sphérique.Advantageously, the lower end of the connector is spherical.
De préférence le canal intérieur du connecteur comporte un gicleur.Preferably the inner channel of the connector comprises a nozzle.
La description qui va suivre et qui ne présente aucun caractère limitatif doit être lue en regard de la figure unique annexée, qui représente en coupe verticale un dispositif de connexion entre un tube de carburant haute pression et une rampe commune d'un système d'injection de carburant pour un moteur thermique selon la présente invention.The following description, which is not limiting in nature, must be read in conjunction with the single appended figure, which represents in vertical section a connection device between a high-pressure fuel tube and a common rail of an injection system. of fuel for a heat engine according to the present invention.
Afin de donner un sens aux mots tels que « supérieur », « inférieur », « extérieur » et « intérieur », le dispositif selon l'invention sera considéré comme orienté sur la figure unique.In order to give meaning to words such as "superior", "inferior", "exterior" and "interior", the device according to the invention will be considered as oriented on the single figure.
Un dispositif de connexion entre un tube de carburant haute pression 1 et une rampe commune 2 d'un système d'injection de carburant pour un moteur thermique est notamment constitué par une pièce intermédiaire désignée dans son ensemble par la référence 3. La rampe commune 2 comporte sur sa paroi 2a, de préférence sur la même génératrice, des piquages 4 permettant de mettre en communication l'extérieur de cette rampe avec l'intérieur de celle-ci.A connection device between a high-pressure fuel pipe 1 and a common rail 2 of a fuel injection system for a heat engine comprises in particular an intermediate part designated as a whole by the reference 3. The common rail 2 has on its wall 2a, preferably on the same generator, tappings 4 for communicating the outside of this ramp with the interior thereof.
Chaque piquage 4 comprend un réceptacle conique 5 dont la base est tournée vers l'extérieur de la rampe et dont le sommet est prolongé par un conduit 6 débouchant dans l'intérieur de cette rampe 2. Le tube haute pression 1 comporte à son extrémité 7 de forme sphérique, dirigée vers le piquage 4, un renflement 8. Ce renflement est de forme générale sphérique : l'épaulement supérieur 8a ainsi constitué est de forme convexe. La pièce intermédiaire 3 comprend, d'une part, un connecteur 9 et, d'autre part, des moyens pour solidariser celui-ci avec le tube haute pression 1 et la rampe 2.Each stitch 4 comprises a conical receptacle 5 whose base is turned towards the outside of the ramp and whose apex is extended by a duct 6 opening into the interior of this ramp 2. The high pressure tube 1 has at its end 7 of spherical shape, directed towards the stitch 4, a bulge 8. This bulge is generally spherical shape: the upper shoulder 8a thus formed is convex. The intermediate part 3 comprises, on the one hand, a connector 9 and, on the other hand, means for securing it to the high-pressure tube 1 and the ramp 2.
Le connecteur 9 est une pièce creuse de révolution dont l'extrémité supérieure 10 coopère avec l'extrémité 7 du tube haute pression 1 et dont l'extrémité inférieure 11 coopère avec le réceptacle conique 5 de la rampe 2, et qui comporte un canal intérieur 12.The connector 9 is a hollow part of revolution whose upper end 10 cooperates with the end 7 of the high pressure tube 1 and whose lower end 11 cooperates with the conical receptacle 5 of the ramp 2, and which comprises an internal channel 12.
Le canal intérieur 12 comprend, à l'extrémité dirigée vers le tube haute pression 1 , un évasement conique 13. Il peut aussi comporter un gicleur 14, qui peut déboucher, comme selon le présent exemple de réalisation, directement dans le réceptacle conique 5.The inner channel 12 comprises, at the end directed towards the high-pressure tube 1, a conical flare 13. It may also comprise a nozzle 14, which can open, as in the present embodiment, directly into the conical receptacle 5.
L'extrémité inférieure 11 du connecteur 9 est de forme sphérique et est en appui contre le réceptacle conique 5 de la rampe 2 : non seulement est ainsi réalisée une liaison étanche à ce niveau, mais aussi une liaison rotule qui permet une libre inclinaison du connecteur 9 avec un contact toujours optimum entre lui et la rampe 2 pour l'étanchéité.The lower end 11 of the connector 9 is of spherical shape and bears against the conical receptacle 5 of the ramp 2: not only is thus made a sealed connection at this level, but also a ball joint which allows a free inclination of the connector 9 with an always optimum contact between him and the ramp 2 for sealing.
A l'extrémité supérieure 10 du connecteur 9, l'évasement conique 13 du canal intérieur 12 coopère avec l'extrémité inférieure sphérique 7 du tube haute-pression 1 : ainsi, à ce niveau, est réalisée une liaison rotule qui permet une libre inclinaison du tube haute-pression 1 avec un contact toujours optimum entre lui et le connecteur 9 pour l'étanchéitéAt the upper end 10 of the connector 9, the conical flare 13 of the inner channel 12 cooperates with the spherical lower end 7 of the high-pressure tube 1: thus, at this level, a ball joint is made which allows a free inclination of the high-pressure tube 1 with an always optimum contact between him and the connector 9 for sealing
Les moyens pour solidariser le connecteur 9 avec le tube haute pression 1 et la rampe 2 sont constitués par un raccord 15 et un écrou 16.The means for securing the connector 9 to the high pressure tube 1 and the ramp 2 consist of a connector 15 and a nut 16.
Le raccord 15 est une pièce de révolution présentant en son intérieur un large conduit axial 17 pour le logement du connecteur 9. Le diamètre de ce conduit axial 17, ou diamètre intérieur du raccord 15, est supérieur à celui du connecteur 9 sur toute la longueur de celui-ci, de telle sorte qu'il existe un jeu entre ces deux pièces lors de leur montage. Ce jeu permettra que le contact entre l'extrémité 11 du connecteur 9 soit toujours optimum avec le piquage 4 de la rampe 2, quelle que soit l'inclinaison du connecteur. Cette inclinaison est rendue nécessaire par les défauts de concentricité, d'une part, entre le raccord 15 et le réceptacle conique 5 réalisé dans le corps de la rampe 2, et, d'autre part, entre les différents contacts de l'assemblage raccord 15 - écrou 16 - tube 1 - connecteur 9. Ce raccord 15 est muni d'un filetage extérieur 18 vers sa partie haute, et il est soudé sur la rampe 2.The connector 15 is a part of revolution presenting inside a large axial duct 17 for the housing of the connector 9. The diameter of this axial duct 17, or inner diameter of the connector 15, is greater than that of the connector 9 over the entire length. of it, so that there is a play between these two parts during their assembly. This game will allow the contact between the end 11 of the connector 9 is always optimum with the stitch 4 of the ramp 2, regardless of the inclination of the connector. This inclination is made necessary by the concentricity defects, on the one hand, between the connector 15 and the conical receptacle 5 formed in the body of the ramp 2, and, on the other hand, between the various contacts of the connection assembly. 15 - nut 16 - tube 1 - connector 9. This connector 15 is provided with an external thread 18 towards its upper part, and it is welded on the ramp 2.
L'écrou 16 comporte une collerette 19 prolongée par une jupe 20 filetée intérieurement. La collerette 19 coopère avec le renflement 8 . La partie inférieure 19a du bord libre de la collerette 19 est de forme conique et coopère avec l'épaulement supérieur 8a du renflement sphérique 8.The nut 16 has a collar 19 extended by a skirt 20 threaded internally. The flange 19 cooperates with the bulge 8. The lower part 19a of the free edge of the collar 19 is of conical shape and cooperates with the upper shoulder 8a of the spherical bulge 8.
Le filetage intérieur de la jupe 20 coopère avec le filetage extérieur 18 du raccord 15.The internal thread of the skirt 20 cooperates with the external thread 18 of the fitting 15.
Pour réaliser la connexion entre le tube haute pression 1 et la rampe commune 2 comportant des piquages tel que le piquage 4 représenté sur la figure unique, on soude un raccord 15 de telle sorte que son axe de symétrie verticale soit sensiblement confondu avec celui du piquage.To make the connection between the high pressure tube 1 and the common rail 2 having tappings such as the tapping 4 shown in the single figure, a connection 15 is welded so that its vertical axis of symmetry is substantially coincident with that of the tapping .
Puis on dispose à l'intérieur de ce raccord 15 un connecteur 9 dont l'extrémité inférieure sphérique 11 vient se loger dans le réceptacle conique 5. De plus, du fait que le diamètre extérieur du connecteur 9 est inférieur sur toute sa longueur au diamètre intérieur du raccord 15 la courbure des surfaces en contact permet un positionnement sensiblement vertical du connecteur sans nécessité une intervention humaine.Then there is inside this connector 15 a connector 9 whose spherical lower end 11 is housed in the conical receptacle 5. In addition, because the outer diameter of the connector 9 is smaller along its length to the diameter Inside the connector 15 the curvature of the surfaces in contact allows a substantially vertical positioning of the connector without the need for human intervention.
Puis, on dispose le tube haute pression 1 muni de l'écrou 16, ce dernier étant retenu par sa collerette 19 sur le renflement 8, et on visse l'écrou 16 sur le raccord 15 : du fait de la pression exercée par la face concave 19a sur l'épaulement convexe 8a, le tube haute pression 1 est placé de façon co-axiale avec le piquage 4 et le connecteur 9.Then, the high pressure tube 1 is provided with the nut 16, the latter being retained by its collar 19 on the bulge 8, and the nut 16 is screwed onto the connector 15: due to the pressure exerted by the face concave 19a on the convex shoulder 8a, the high pressure tube 1 is placed coaxially with the stitch 4 and the connector 9.
Ainsi que saura le déterminer l'homme du métier, le connecteur 9 est réalisé en un matériau plus dur que les autres pièces constituant le dispositif de connexion selon la présente invention. Ainsi, les déformations sur le connecteur 9 sont nulles ou, à tout le moins, négligeables. As will be known to those skilled in the art, the connector 9 is made of a harder material than the other parts constituting the connection device according to the present invention. Thus, the deformations on the connector 9 are zero or, at the very least, negligible.

Claims

R E V E N D I C A T I O N S R E V E N D I C A T IO N S
1 - Dispositif de connexion entre un tube de carburant haute pression (1 ) et une rampe commune (2) d'un système d'injection de carburant pour un moteur thermique, du genre comprenant une pièce intermédiaire qui est disposée dans un raccord (15) solidaire de ladite rampe commune (2) au niveau chaque piquage (4) qui est ménagé dans sa paroi (2a) et comprend un évasement conique (5) dont la base est tournée vers l'extérieur de ladite rampe (2), et qui comprend, d'une part, un connecteur (9) qui comporte un canal intérieur (12), qui est disposé dans ledit raccord (15), et dont l'extrémité supérieure (10) coopère avec l'extrémité (7) dudit tube (1 ) et dont l'extrémité inférieure (11 ) coopère avec ledit évasement conique (5), et, d'autre part, un écrou (16) qui est constitué d'une collerette (19), dont le bord extérieur est prolongé d'une jupe (20), et est retenu à l'extrémité correspondante dudit tube (1 ) par l'épaulement (8a) d'un renflement (8) que comporte ce dernier et coopère avec ledit raccord (15), caractérisé par le fait que le diamètre intérieur dudit raccord (15) est sensiblement supérieur au diamètre extérieur dudit connecteur (9), sur toute la longueur de ce dernier, permettant une inclinaison dudit connecteur (9) avec un contact toujours optimum entre lui et ladite rampe (2) pour l'étanchéité.1 - Connecting device between a high pressure fuel tube (1) and a common rail (2) of a fuel injection system for a heat engine, of the kind comprising an intermediate piece which is arranged in a coupling (15). ) secured to said common ramp (2) at each stitching (4) which is formed in its wall (2a) and comprises a conical flare (5) whose base is turned towards the outside of said ramp (2), and which comprises, on the one hand, a connector (9) which has an inner channel (12), which is disposed in said connector (15), and whose upper end (10) cooperates with the end (7) of said tube (1) and whose lower end (11) cooperates with said conical flare (5), and, secondly, a nut (16) which consists of a flange (19), whose outer edge is extended by a skirt (20), and is retained at the corresponding end of said tube (1) by the shoulder (8a) of a bulge (8) which is it cooperates with said connector (15), characterized in that the inner diameter of said connector (15) is substantially greater than the outer diameter of said connector (9), over the entire length of the latter, allowing inclination of said connector (9) with always optimum contact between it and said ramp (2) for sealing.
2. - Dispositif de connexion selon la revendication 1 , caractérisé par le fait que le renflement (8) est de forme sphérique et que la partie inférieure du bord libre (19a) de la collerette (19) de l'écrou (16) est conique.2. - Connection device according to claim 1, characterized in that the bulge (8) is spherical in shape and that the lower part of the free edge (19a) of the flange (19) of the nut (16) is conical.
3. - Dispositif de connexion selon la revendication 1 , caractérisé par le fait que le canal intérieur (12) comprend à son extrémité dirigée vers le tube haute pression (1 ) un évasement conique (13) et que l'extrémité (7) dudit tube (1 ) est sphérique.3. - Connecting device according to claim 1, characterized in that the inner channel (12) comprises at its end facing the high pressure tube (1) a conical flare (13) and that the end (7) of said tube (1) is spherical.
4. - Dispositif de connexion selon la revendication 1 , caractérisé par le fait que l'extrémité inférieure (11 ) du connecteur (9) est sphérique.4. - Connecting device according to claim 1, characterized in that the lower end (11) of the connector (9) is spherical.
5. - Dispositif de connexion selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que le canal intérieur (12) du connecteur (9) comporte un gicleur (14). 5. - Connection device according to any one of claims 1 to 4, characterized in that the inner channel (12) of the connector (9) comprises a nozzle (14).
EP05778668A 2004-06-25 2005-06-24 Device for connecting a high pressure fuel tube Withdrawn EP1794440A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0407016A FR2872252B1 (en) 2004-06-25 2004-06-25 CONNECTING DEVICE
PCT/FR2005/001592 WO2006010825A1 (en) 2004-06-25 2005-06-24 Device for connecting a high pressure fuel tube

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EP1794440A1 true EP1794440A1 (en) 2007-06-13

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EP (1) EP1794440A1 (en)
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Also Published As

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FR2872252B1 (en) 2008-03-14
US20080042434A1 (en) 2008-02-21
FR2872252A1 (en) 2005-12-30
WO2006010825A1 (en) 2006-02-02

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