FR2804723A1 - FUEL DISTRIBUTOR ELEMENT FOR A FUEL SUPPLY SYSTEM OF AN INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

Element composed of a plastic body (11), elongated and a metal supply pipe (13) whose re-entrant segment (131) is received in a receiving hole (14) made in the body (11) ; it comprises a crimped connection (17) fixing the supply pipe (13) in an axially locked manner in the plastic body (11). To reduce the manufacturing cost while providing a bond protected in the event of an impact, between the plastic body (11) and the metal supply pipe (13), the crimped connection (17) comprises a crimping flange (18). ) formed directly on the plastic body (11) and a crimping ring (19) integrally connected to the supply pipe (13) and folded by its edge on the crimping flange (18).

Description

State of the art

  The present invention relates to a distri-

  fuel stopper for a fuel supply installation of an internal combustion engine, comprising a hollow plastic body and a supply pipe

  opening into it, made of a hard material including

  made of metal, and whose segment going at one end,

  is housed at least partly, in a fitted manner in a per-

  receiving hole made in the plastic body and a crimped connection comprising a crimping ring acting on the supply pipe, for axially locking

  the supply pipe into the plastic body.

  Such fuel dispensing elements,

  installed with a plastic body and a metal supply pipe, used on the one hand to avoid expensive dispensing elements, made of metal and on the other hand, in the event of an impact, to avoid the risk fuel leakage and thus the risk of fire resulting therefrom as a result of tearing off the fuel hose, as is the case

  produced in the case of distributor elements manufactured com-

quite plastic.

  A known fuel dispensing element,

  corresponding to the type defined above (US 5,105,787), also called "common rail", comprises a metal sleeve

  coaxial with the receiving piercing, inserted into the body

  plastic and which protrudes from this plastic body

  only by an end segment carrying a radial flange to block the metal supply pipe on the plastic body. The metal sleeve has grooves

  outer annulars in its area surrounded by plas-

  tick and, during the injection of the plastic body, this sleeve is placed in the injection mold so that the annular grooves fill with plastic material. In addition, the outer casing of the supply pipe has a radially projecting annular bead which is placed

  in place when engaging the end of the pipe in the segment

  enlarged diameter of the receiving hole made under

  the shape of a stepped hole. The crimping ring is engaged

  ge on the supply pipe and it is crimped on the edge side over the radial flange of the metal sleeve; at this

  level it leans against the supply pipe coming from

  be the annular bead, and exerts an axial prestress on the O-ring placed between the annular flange and the annular shoulder produced in the stepped bore. The O-ring seals the annular gap, tainted with tolerances, between the small diameter drilling segment of the receiving hole, and the end of the pipe

  feed which is engaged in an adjusted manner.

  Advantages of the invention The aim of the present invention is to remedy the drawbacks of known solutions and to this end relates

  a fuel distributor element of the type defined above

  above, characterized in that the crimping ring is

  integral with the supply pipe, at the end of its re-entrant segment not located on the side of the free end of this supply pipe, and this crimping ring is

  folded down on the edge side over a crimp collar

  sage formed directly on the plastic body.

  The fuel dispensing element according to the invention offers the advantage of producing the crimped connection

  directly between the supply pipe and the body

  plastic, removing the accessory components.

  The crimping ring is connected integrally, directly

  to the supply pipe, preferably by a weld (bra-

  sure) and the crimping flange is directly formed

  on the plastic body. Compared to the lia-

  its known setting, we remove the annular bead formed

  on the supply pipe, the manufacture of which is related to

  costly and is not always possible with the material

  channel in which the supply pipe is made, as well as the additional metal sleeve placed in the plastic body and which causes drawbacks due to the different thermal expansions between the material

plastic and metal.

  The crimped connection according to the invention is carried out in a much more advantageous and considerably less costly manner because of simple construction; it allows a compact connection, saving space for the fuel supply line. The crimped collar, produced by injection, ensures the distribution of the force induced in the supply pipe in the event of an impact, over a larger surface of the plastic body. The supply hose bends before the plastic material is damaged in terms of sealing. The adjusted installation of the supply pipe in the receiving hole

  thus offers good lateral hold.

  According to other advantageous features of the invention: * a rotation blocking means acts between the crimping ring and the plastic body; for example,

  the rotation locking means comprises a rib formed

  mée on the upper side of the crimping collar

  and which penetrates into a radial slot of the service ring

  weaving; * the receiving hole which receives the incoming segment from

  supply pipe is made in the form of a per-

  stepped bore in the plastic body, this bore having a narrow inlet segment with an enlarged internal diameter, and the inlet segment receives a seal preferably in the form of an O-ring; advantageously, the seal is clamped between the crimping ring and the annular shoulder formed at the bottom of the inlet segment in the receiving hole, and / or between the supply pipe and the inner wall of the input segment of the receiving hole; * the receiving hole of the plastic body which

  receives the re-entering segment of the supply pipe

  carries a narrow passage segment, of reduced internal diameter, directly adjacent to the entry segment, and the

  supply hose has an outer diameter cor-

  corresponding to the free diameter of the passage segment which is

  reduced at the passage segment to an outside diameter

  laughing corresponding to the inside diameter of the receiving hole. The crimped connection according to the invention allows, with only reduced additional means, to achieve a rotation blocking of the supply pipe in the plastic body because, according to a preferred embodiment of the invention, it forms a rib on the upper side of the crimping collar, rib which penetrates

  in a radial slot of the crimping ring. Such a blo-

  rotating cage is practically impossible in the arrangement-

  known crimping point, described in the preamble.

  According to an advantageous embodiment of the invention, the supply pipe is made in the form of a supply nozzle for the connection of a fuel supply pipe and the part of the supply nozzle projecting from the plastic body is bent in two planes at right angles, outside the axis of the re-entrant segment so that any force acting on the feed nozzle generates at this level a torsional or bending torque. This constructive measure guarantees, whatever the impact, the deformation of the supply pipe or nozzle and

  absorption of shock energy by deformation work

  tion, so that the plastic body does not tear

  neither inward nor outward at the level of the

its set.

  Drawings The present invention will be described below in more detail with the aid of an exemplary embodiment

  shown schematically in the accompanying drawings in the-

  which: * Figure 1 is a side view of a distributor element

  of fuel for a fuel system

  running on an internal combustion engine,

  * Figure 2 is a top view of the dispensing element

  fuel burner seen in the direction of arrow II in FIG. 1,

  * Figure 3 is a section along line III-III of the figure

gure 1.

  Description of the exemplary embodiment

  The fuel distributor element shown in different views of the drawings is for example designed for a fuel supply installation comprising three injectors for an internal combustion engine with three cylinders. This element consists of an elongated hollow body 11, made of plastic, provided with three nozzles 12 for each receiving an injector not shown; these tips are formed on the body 11; there is also provided a supply pipe or nozzle 13 opening into the body 11 in material

  plastic; this nozzle is made of a hard material, here of the

  tal, preferably stainless steel. Inside the plastic body 11, a connection is made by means of a cavity 15 (FIG. 3) between the mouth

  of the feed nozzle 13 and the various nozzles 12.

  The number of end caps or cups 12 can be modified and adapted to the number of cylinders of the respective internal combustion engine.

  The feed nozzle 13 is received by a segment.

  reentrant 131 (figure 3), at one end, in a per-

  receiving hole 14 produced in the plastic body 11 and its part 132 which protrudes from the plastic body 11 is bent in two planes at right angles to the axis of the re-entrant segment 131, so that the force acting on the feed nozzle creates a torsion or bending torque at this level. The drilling 14 which arrives

  in the plastic body 11 substantially tangent

  tial to the cavity 15 connecting the end pieces 12, is produced in the form of a stepped bore having an inlet segment 141 open towards the surface of the body 11, of large

  inner diameter, which continues with a transi-

  roof 142, narrow, with an internal diameter adapted to the diameter

  external meter of the supply nozzle 13, and an end segment 143, long in diameter reduced compared to that

of the transient segment 142.

  The re-entrant segment 131 of the supply nozzle 13, engaged in the receiving bore 14, is

  made so that its outside diameter in the transparent segment

  area 142 of the receiving hole 14, is reduced to a diameter

  external meter corresponding to the free diameter of the segment

  end 143, so that the end of the segment

  trant 131 comes snugly into the long end segment 143 of the receiving bore 14. Thanks to the diameter of the end segment 143 and that of the end of the re-entering segment 131 which are closely matched to each other. other, very good lateral resistance of the feed nozzle 13 is ensured in the receiving bore 14. A seal 16 in the form of an O-ring is placed in the end segment 141 to ensure sealing; this joint

  is clamped radially between the casing of the fuel nozzle

  entry 13 and the inner wall of the entry segment 141

  of the receiving hole 14. As the end of the segment

  trant 131 of the supply pipe or nozzle 13 is of diameter

  be reduced, when the nozzle 13 is engaged in the drilling of

  reception 14 through the O-ring 16 placed in the segment

  end 141, avoid damage to the O-ring

  16 during the positioning operation.

  The feed nozzle 13 engaged by its seg-

  reentering 131 in the receiving hole 14, is blocked by a crimping link 17, directly on the plastic body 11 to thereby prevent any axial sliding of the supply nozzle 13 in the plastic body 11, or even any axial extraction of the feed nozzle 13 relative to the plastic body 11. The crimp connection 17 consists of a crimp collar 18 formed on the plastic body 11, and a ring crimp 19 welded on the nozzle

  feed 13; after engagement of the feed nozzle

  tation 13 in the receiving hole 14 the ring is folded down

  crimp 19 around the crimp flange 18.

  The crimping ring 19 thus delimits the re-entering segment

  131 of the supply nozzle 13 and covers the O-ring

  as 16 and the surface of the crimping collar 18. Thanks to an appropriate choice of the depth of the inlet segment 141 of the receiving bore 14, and the diameter of the bead of the

  O-ring 16, you can also tighten the latter axial-

  between the crimping ring 19 and the annular shoulder

  the area 20 formed in the passage between the entry segment 141 and the

passage segment 142.

  As shown in Figures 1 and 2, between the crimping ring 19 and the plastic body 11 there is a rotation lock 21. This rotation lock 21 is achieved by a rib 22 formed on the upper side of the

  crimping flange 18 and which penetrates into a flat slot

  dial 23 of the crimping ring 19.

Claims (8)

R E V E N D I C A T I ON S   1) Fuel distributor element for a fuel supply installation of an internal combustion engine, comprising a hollow body (11) of plastic material and a supply pipe (13) opening into it, made in a hard material in particular of metal, and of which the re-entrant segment (131) at one end, is housed at least in part, in an adjusted manner in a receiving hole (14) made   in the plastic body (11), and a connection   tie (17) comprising a crimping ring (19) acting on the supply pipe (13), for axially locking the supply pipe (13) in the plastic body (11), characterized in that the crimping ring (19) is integrally connected to the supply pipe (13), at the end of its re-entrant segment (131) not located on the side of the free end of this supply pipe (13), and this crimp ring is folded over the edge side over a crimp flange (18)   formed directly on the plastic body (11).   2) Fuel distributor element according to the claim   tion 1, characterized in that the crimping ring (19) is welded to the supply pipe (13).   3) Fuel distributor element according to the claim   tion 1 or 2, characterized by a rotation blocking means (21) acting between the ring   crimp (19) and the plastic body (11).   4) Fuel distributor element according to the claim   tion 3, characterized in that the rotation locking means (21) comprises a rib   (22) formed on the upper side of the crimp collar   sage (18) and which penetrates into a radial slot (23) of the crimping ring (19).    ) Fuel dispensing element according to any one of claims 1 to 4   characterized in that the receiving hole (14) which receives the re-entrant segment (131) of the supply pipe (13) is produced in the form of a stepped hole in the plastic body (11),   this bore having an inlet segment (141), narrow, with diameter   be enlarged interior, and the inlet segment (141) receives a seal (16)   preferably in the shape of an O-ring.   6) Fuel distributor element according to the claim tion 5, characterized in that   the seal (16) is clamped between the ring   weaving (19) and the annular shoulder (20) formed at the bottom of the   entry segment (141) in the receiving hole (14).   7) Fuel distributor element according to the claim   tion 5, characterized in that the seal (16) is clamped between the supply pipe (13) and the inner wall of the segment   inlet (141) of the receiving hole (14).   8) Fuel distributor element according to any one from claims 5 to 7,   characterized in that the receiving bore (14) of the plastic body (11) which receives the re-entrant segment (131) of the supply pipe (13), comprises a passage segment (142), narrow, of internal diameter reduced, directly adjacent to the inlet segment (141), and the supply pipe (13) has an outside diameter corresponding to the free diameter of the passage segment (142), which is reduced, at the level of the passage segment (142 ), with an outside diameter corresponding to the inside diameter of the receiving hole (14).   9) fuel dispensing element according to any one of claims 1 to 8,   characterized in that the supply pipe is made in the form of a supply nozzle (13) for the connection of a fuel supply line, and the part (132) of the supply nozzle (13 ) protruding from the plastic body (11) is bent in two planes at right angles, outside the axis of the re-entrant segment (131), so that any force acting on the feed nozzle   (13) generates at this level a torsional or bending torque.