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
  • F02M55/004—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
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/008—Couplings of the quick-acting type for branching pipes; for joining pipes to walls
• • 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 a wall or to the axis of another pipe
  • F16L41/12—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of a wall or to the axis of another pipe using attaching means embracing the pipe

Definitions

• the present invention relates to a quick-coupling coupling, in particular a connector used in a fuel supply system comprising a plurality of injectors feeding an internal combustion engine, in particular a diesel engine.
• a connector of this type is associated with each injector and has the function of connecting it to a fuel return duct to a fuel tank.
• the injectors are powered by a high pressure pump and fuel return is indeed relatively important. This use of a quick coupling on a fuel injector is well known per se and will not be explained in more detail.
• Figures 1 to 5 illustrate the structure and use of such a quick coupling coupling 1 currently used to connect an injector 2 to a return duct (not shown).
• the injector 2 comprises at one of its ends an injection nozzle 3 and at another end an axial inlet 4 of fuel under high pressure.
• FIGS 3 and 4 show the coupling quick coupling 1 in a side view respectively in a top view.
• the connector 1 comprises a cylindrical hollow body 5 which at a rear end has connecting means 6, 7 to a fuel return duct (not shown in the figures).
• the connector 1 comprises a tubular nozzle 8 carrying sealing means in the form of an O-ring seal 9.
• This tubular nozzle 8 can be received in a bore 10 of the injector 2 to rest in a housing 11 at the bottom of the bore communicating with the interior of the injector to receive the return fuel.
• the body 5 of the connector 1 carries retaining means of the tubular nozzle 8 in the housing 11.
• These retaining means comprise a frame 12 carrying two elastic arms 13 constituting extensions frame forward.
• the frame 12 is generally rectangular and encloses at the rear end the connecting means 6, 7 and the front end of the nozzle 8.
• the side of the frame 12 which encloses the tip 8 has a curved shape adapted to the surface outside the injector 2 to come to press against it when the tip is inserted into the bore 10.
• the two elastic arms 13 extend on either side of the nozzle 8 substantially parallel to each other to snap onto the injector 2 when the nozzle 8 is introduced into the bore 10.
• it has on its periphery two flats 14 parallel to each other against which the arms can rest and the ends thereof are deflected to one the other so as to bear against the outer face of the injector and thus hold the fitting in position against it.
• the quick-coupling coupling 1 which has just been described, however, is very limited in its use since it assumes that the bore 10 is perpendicular to the axis of the injector 2 and that there is sufficient space behind it. ci to let the arms 13 for their snap.
• quick coupling couplings which, as means for retaining the connection on the injector, use a clip whose first branch is inserted into a bore so as to fit into a groove of the coupling end, while its second branch, which has at its end a hooking means, enters a recess to thereby retain the clip in place while allowing its extraction to release the tip.
• this solution is relatively complicated to implement since it requires a large number of high precision machining operations.
• the object of the invention is to provide a quick coupling coupling which allows its installation under virtually any angle with respect to the axis of the injector, which is simple to manufacture. and that can easily be installed and uninstalled.
• this connection comprises, according to one embodiment, a double safety avoiding any fuel leakage caused by an untimely release of the retaining means.
• the object of the invention is a quick-coupling coupling adapted to connect an injector of an internal combustion engine to a fuel return conduit, comprising a generally cylindrical hollow body having, at a rear end, means of connection to said conduit. fuel return, and at a front end a tubular nozzle carrying sealing means and adapted to be received in a housing formed in a bore on the periphery of said injector in communication with the interior thereof, said bearing body retaining means for said tubular nozzle in said housing, characterized in that said retaining means comprise two elastic tongues in an arc extending circumferentially around said body substantially concentrically with the axis thereof, each of said tongues defining with the periphery of said body an arcuate slot open on one side, and in that said tabs are adapted to ooperate with a groove provided inside said piercing of the injector.
• said tongues carry at one free end a hooking member in the form of a protuberance adapted to penetrate into said groove; a fixed end of each tongue is connected to said body via a radial rib on said body; said radial rib of a first tongue is disposed diametrically opposite the rib of a second tongue; the thickness of said protuberance substantially corresponds to the thickness of said slot; adite protuberance has a curved profile to the outside; said tongues are sized to protrude out of said bore when said tip is inserted therein; the flexing of said tongues towards the front is delimited by a collar on the periphery of said body; said collar is adapted to serve as a stop against a circular shoulder in said bore during the introduction of said tip therein; said body, said connecting means, said tabs, said ribs and said collar are made of material; said fitting further comprises intermediate tab locking members, these locking members having an arcuate shape and being able to be inserted into a respective
• the invention also relates to a quick coupling coupling defined above, characterized in that it is associated with a coupling having the characteristics mentioned above, and in that it is adapted to cooperate with means of restraint provided on the fitting.
• FIG. 1 and 2 show a side view, partly in cutting, respectively a top view of an injector adapted to receive a known quick coupling coupling
• Figures 3 and 4 show a side view respectively a top view of a known coupling coupling adapted to be mounted on the injector illustrated in Figures 1 and 2
• Figure 5 shows schematically in a view from above the connection of Figures 3 and 4 mounted on the injector of Figures 1 and 2
• FIG. 6 shows a partial view, partly in section, an injector adapted to receive a quick-coupling coupling according to the invention
• Figure 7 is a side view, partly in section, of a quick-coupling coupling according to the invention
• FIG. 8 is a perspective view of the connection of FIG.
• Figure 9 is a sectional view along the line IX-IX of Figure 7;
• Figure 10 is a perspective view of intermediate blocking means according to the invention;
• Figure 11 is a top view of the connector of Figures 7 and 8 mounted on the injector of Figure 6;
• Fig. 12 is a side view, partly in section, showing the position of the interlocking locking means of Fig. 10 before insertion into the piercing of the injector;
• Fig. 13 is a side view, partly in section, showing the position of the interposing locking means of Fig. 10 after insertion into the piercing of the injector. Part of Figure 13 has been made on a larger scale to better show the details.
• Figure 6 shows a portion of an injector 15 of the type equipping an internal combustion engine.
• This injector 15 has a radial inlet 4 of fuel under high pressure and is provided with a bore 16 adapted to receive a quick coupling 17 according to the invention as shown in FIGS. 7 and 8. Drilling 16 is carried out in a tubing 18 at a rear end of the injector 15 and is in communication with the interior thereof.
• the connector 17, which in the example illustrated is a T-piece, comprises a generally cylindrical hollow body 19 having, at a rear end, connecting means 20, 21 making it possible to connect the coupling to a fuel return pipe (not shown). ).
• the body 19 has at a front end a tubular nozzle 22 provided with sealing means in the form of an O-ring seal 9.
• the nozzle 22 is adapted to be received in a housing 23 at the bottom of the bore 16 (see Figure 12).
• the body 19 carries retaining means of the endpiece 22 in the housing 23. According to the invention, these retaining means comprise two elastic tongues 24, 25 in an arc extending substantially concentrically to the axis AA of the body.
• Each of the elastic tabs 24, 25 defines with the periphery of the body 19 a slot in a circular arc 26, 27 and carries at its free end a fastening member in the form of a protrusion 28, 29.
• Each of the resilient tongues 24, 25 is connected to the body 19 by means of a radial rib 30, 31 on the body to move the respective tongue outwards so that the thickness of the corresponding slot 26, 27 corresponds to substantially at the thickness of the protrusion 28, 29.
• the rib 30 of the first tongue 24 is disposed diametrically opposite the rib 31 of the second tongue 25.
• the protuberances 28, 29 are capable of penetrating into a groove 32 formed in the rear part of the bore 16 and can, when the endpiece 22 of the coupling 17 is inserted into the bore 16, retract elastically towards the fitting body 19 to then extend in the groove 32 thanks to the elastic return of the tongues 24, 25.
• the protuberances 28, 29 advantageously have an inclined bottom surface 33 forming a ramp, coming into contact with the edge around the opening of the bore 16 which in the same way may comprise an inclined annular surface 34 of the same angle to better cooperate with the lower surface 33.
• the protuberances 28, 29 advantageously also have an inclined upper surface 35 forming a ramp in contact with an inclined surface 36 of the same angle in the upper part of the throat 32.
• the protuberances 28, 29 may simply have a section of a circle in section and in this case, the inclined surfaces 34 and 36 are no longer indispensable. It is sufficient, in fact, to provide a curved profile in one way or another to the outside.
• the connector 17 further comprises a flange 37 disposed on the periphery of the body 19 immediately after the tongues 24, 25 so as to delimit the bending thereof forward when removing the tip 22 from the bore 16.
• collar 37 also serves as abutment bearing against a circular shoulder 38 defining the groove 32 in the bore 16 downwards.
• the location of the collar 37 with respect to the shoulder 38 is such as to determine the insertion length of the body 29 into the bore 16.
• the tongues 24, 25 are dimensioned to project out of the bore 16 when the tip is in its housing 23 in the bore to allow radial compression during disassembly of the connector 17.
• the cylindrical body 19, the connecting means 20, 21, the tabs 24, 25, the ribs 30, 31 and the collar 37 are made of material, for example by injection molding of an elastic material such as polyamide .
• the connector 17 further comprises interlocking locking members 39, 40 of the tongues 24, 25.
• These locking members 39, 40 have an arcuate shape and they are able to be inserted in a respective slot 26, 27 after the insertion of the nozzle 22 in the bore 16 to connect the connector 17 to the injector 15. In this way, the protuberances 28, 29 can not leave the groove 32 and the tongues are thus locked inside the bore 16.
• the locking members 39, 40 are advantageously connected to the underside of a ring 41 slidably mounted on the body 19.
• the locking members 39, 40 define between them notches 42, 43 open downwards and able to receive the ribs 30, 31 during the introduction of the locking members in the slots 26, 27.
• the locking members Preferably, the locking members completely fill the slots 26, 27 extending from one rib (30 or 31) to the next .
• the locking members 39, 40 thus constitute with the ring 41 an assembly having the general shape of a flanged sleeve which is advantageously manufactured in one piece, also in elastic material.
• the ring is split (44) up to one (42) of the notches. This allows its mounting on the body 19 by the side.
• the tongues 24, 25 take the form indicated in FIG. 9 and it is then possible to move the locking members 39, 40 downwards by pushing on the ring 41 so that these organs enter the slots 26 , 27 so as to fully lock the tongues inside the bore 16.
• the locking members 39, 40 thus provide a double security and there is no risk that the connection can be unintentionally released.
• Uninstalling connector 17 is also very simple.
• the locking members 39, 40 are first moved outwards by pulling on the ring 41 and then, because the tongues 24, 25 project out of the bore 16, they can be pinched to remove the protuberances 28. , 29 of the groove 32 of the bore and from this moment remove the assembly of the connection without problem.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)
• Fuel-Injection Apparatus (AREA)
• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
• Compositions Of Oxide Ceramics (AREA)
• Media Introduction/Drainage Providing Device (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (2)

Family

ID=37697979

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (5)

Family Cites Families (16)

• 2006
  • 2006-08-16 DE DE602006002823T patent/DE602006002823D1/de active Active
  • 2006-08-16 EP EP06291313A patent/EP1890030B1/fr not_active Not-in-force
  • 2006-08-16 AT AT06291313T patent/ATE408752T1/de not_active IP Right Cessation
• 2007
  • 2007-08-10 US US12/377,272 patent/US20110095522A1/en not_active Abandoned
  • 2007-08-10 WO PCT/FR2007/051810 patent/WO2008020145A2/fr not_active Ceased
  • 2007-08-10 JP JP2009524219A patent/JP2010500505A/ja not_active Ceased

Also Published As

Similar Documents

Legal Events