FR2556814A1 - FLEXIBLE PRESSURE PIPE - Google Patents

Abstract

THE OBJECT OF THE INVENTION IS A FLEXIBLE PRESSURE PIPE1, INCLUDING AT LEAST ONE OVERMOLDED ENCLOSURE8 ON THE EXTERNAL SURFACE OF THIS PRESSURE PIPE, THE SURFACE OF THIS ENVELOPE BEING IN CONTACT WITH THE EXTERNAL SURFACE OF THE PRESSURE PIPE IN COMPLIANCE WITH THIS LATTER WHICH IS DEFORMED IN THE ENVELOPE REGION, THIS DEFORMED SURFACE BEING, BEFORE THE OVERMOLDING OF THE ENVELOPE, PRODUCED BY A RADIAL THRANGEMENT ACTING LATERALLY ON THE PRESSURE PIPE NEXT TO THE ENVELOPE. ACCORDING TO THE INVENTION, ANOTHER PIPE7, ON WHICH THE ENVELOPE8 IS PARTIALLY OVERMOLDED, IS AGENCY ON THE PRESSURE PIPE1, AND IN THAT THE THROTTLE ACTS DIRECTLY ON THESE OTHER PIPE7.

Description

The invention relates to a flexible pressure hose comprising

  at least one envelope overmolded on the outer surface of this pressure pipe, the surface of this envelope being in contact with

  the outer surface of the pressure pipe in accordance with the latter

  re which is deformed in the envelope area, this deformed surface

  being, before the overmoulding of the envelope, produced by a choke-

  radial action acting laterally on the pressure pipe, side

  of the envelope, according to the German patent application 32 46 219.

  In the flexible pressure pipe according to this main request

  the envelope is directly overmolded on the pipe and / or the connection piece of the pressure pipe. The casing serves as a protective sheath and exerts pressure on the pressure pipe

  protective action against wear and stabilization direction-

nelle.

  The object of the invention is to simplify the pressure hose.

  flexibility of the type mentioned at the beginning, and to make its

  tion and its assembly more economical, and to realize at the same time as the envelope a fastening arrangement immobilizing the others

  parts that must be placed on the pressure pipe.

  According to the invention, this object is achieved by the fact that another pipe, on which the envelope is partially overmoulded,

  is arranged on the pressure pipe, and by the fact that

  ment acts directly on said other pipe. By over-molding the enve-

  loppe simultaneously on the pressure pipe and on the other pipe, an irremovable assembly of this other pipe is made to the pressure pipe, through the casing. The strangulation is

  then directly engaged in the other pipe that he indirectly presses

  on the outer surface of the connecting piece, so that an additional connection, by friction, is established between this pipe and the connecting piece. While the pipe increases, for example, the bending stiffness of the pressure pipe, the casing can at the same time, through the use of resistant materials,

  act as effective protection against abrasion.

  To avoid the risk of rupture at the transition of a connecting piece to the pressure pipe, the invention provides that

  the other pipe surrounds the connecting piece and the pressure hose

  part of their length, and that the envelope is formed by a socket which engages in one or more depressions of the outer surface of the connecting piece. Over-molding of the sleeve-shaped casing on the connection piece creates a positive mechanical connection between this sleeve and the connecting piece. The sleeve which, on its other side, narrows the pipe, thus connects it to the connection piece, by a connection

positive mechanics.

  I0 In order for the pressure hose to occupy its position of

  the invention provides for forming abutment surfaces

on the envelope.

  Before connecting the conjugate component to the room

  connection, the mounting position is achieved by means of a

  fixing element on the pressure pipe, this arrangement comprises

  an ear formed on the envelope and traversed by an opening

  ture, and having at least one abutment surface.

  The rattling noise of the pipe against the chassis of a vehicle may be excluded if the other pipe is made of rubber or a plastic material having

the elasticity of a rubber.

  The different objects and characteristics of the invention

  will now be detailed in the description that follows,

  by way of non-limiting example, with reference to the appended figures which represent: FIG. 1, a partial view in longitudinal section of a flexible pressure pipe according to the invention, considered in the region of the connecting piece; ; and - Figure 2, a top view of the pressure pipe according to

Figure 1.

  According to FIGS. 1 and 2, a connection piece 2 made

  made of metal is mounted in a sealed manner and secured by a

  positive, at the end of the pressure hose 1. At the far end

  In this connection piece, on the surface thereof, a hexagon 3 is provided, the leading surfaces of which are provided so that a key can be applied thereto for the purpose of tightly screwing the connecting piece 2 to a conjugate connection piece not shown. To this end, a threaded hole not shown in the drawing, having a conical profile sealing surface, is arranged concentrically at the central line 5 of the pressure pipe 1, in the connecting piece 2, this threaded hole opening into

  the end surface at the end of the connecting piece 2.

  The conjugated connecting piece is for example constituted by a braking line installed at a fixed station or by a receiver

  hydraulically actuable pressure

  To attach the pressure hose 1 into the receiving hole

  connection piece 2 provided for this purpose, but no

  shown in the drawing, equally distributed 6 depressions are

  on the surface of the periphery of this connecting piece 2 and form, on the inner side of this piece 2, raised parts which sink, forming a positive mechanical connection,

  in the surface of the pressure pipe 1.

  The portion of the pressure pipe 1 which is located on the right in the drawing and the left end of the connecting piece 2 are surrounded, with a prestress, by another pipe 7 whose function is to stiffen the zone of the right-of-way. of the pressure pipe 1, at the transition with the connecting piece 2. This other pipe 7 may be, for example, a similar plastic material

  to a rubber and be overmolded on the brake pipe 1. Any-

  it can also be made of rubber and then slipped,

  after mounting the connection piece 2, on the pressure pipe

  sion 1, using an expander tool.

  At the right end of the drawing, the surface of the pipe 7 is firmly surrounded by a bush 8 also called envelope. In the drawing, this sleeve 8 extends on the surface

  outside of connection piece 2, towards the right

  4, and ends shortly before the end of the hexagon 3. The connecting piece 2 has, on its outer surface, an annular groove 9 dipping radially, in which the sleeve 8 is

  taken during injection molding and thus receives a positioning

  fixed on the piece d. racccrdument.

  In the vicinity of its left edge. considering

  drawing, the sleeve 8, by its annular collar 1c.

  section V, strangles the pipe 7 so that it is connected, by a positive mechanical connection, to the sleeve 8 which, as already mentioned, is itself engaged by

  positive mechanical connection - with connection piece 2.

  It is at the edge of the bushing 8 that the neck strangulation

  10 is the most important, which results from the manufacturing process.

  cation of the sleeve 8 described in the application DE-32 4b 219.

  An ear 11, provided with a hole oriented perpendicularly to the central line 5 of the pressure pipe 1, starts from the surface

  outer shell of the sleeve 8 and follows a tangential direction

  tielle forming a projection on the outside. This ear 11 presents

  te, on its outer face, a bearing surface 13 which serves as a support

  when bolted to a fixed component consisting, for example,

  by a vehicle body. Part of the surface area

  dne of the connecting piece 2, or of the bushing 8, serving as abutment surface 14, is provided to serve as a stop preventing larotation of the pressure pipe 1 in the region of the

connecting piece 2.

  It is obvious that the foregoing description has

  given as a non-limitative example and that many variants can be envisaged without departing from the scope

of the invention.

2,556 8 1 4

Claims (5)

  1. A flexible pressure pipe, comprising at least one casing molded on the outer surface of this pressure pipe,   the surface of this envelope being in contact with the external surface   of the pressure pipe conforming to the latter which is deformed in the region of the envelope, this deformed surface   being, before the overmoulding of the envelope, produced by a foreigner   radial seal acting laterally on the pressure pipe adjacent to the casing, characterized in that another pipe (7), on which the casing (8) is partially overmolded, is arranged on the pressure pipe (1) , and in that the constriction acts directly on said other pipe (7). 2. A pressure pipe according to claim 1, comprising   a connecting piece attached to the end of this pressure hose   characterized in that said other pipe (7) surrounds the connecting piece (2) and the pressure pipe (1) over part of their length, and in that the casing (8) is formed by a sleeve who engages in one or more depressions (6 and / or 9)   the outer surface of the connecting piece (2).   3. Pressure pipe according to claim 1 or 2, characterized   characterized in that abutment surfaces (12, 14) are formed on the envelope (8).   4. Pressure pipe according to claim 3, characterized in that an ear (11) is formed on the casing (8), this ear being traversed by an opening (12) and having at least an abutment surface.   5. Pressure pipe according to any one of the claims   characterized in that said other pipe (7) is made of rubber or a plastic material having the elasticity of a rubber.