FR2621075A1 - EXHAUST FLANGE HOSE FOR EXHAUST GASES OF A VEHICLE ENGINE - Google Patents

Abstract

The invention relates to automobile construction. This exhaust pipe 1 provided with an end flange 3 has, for fixing the pipe itself to the flange, at least one laser welding zone 7 ', 8'. Main applications: connection of the exhaust pipe to the exhaust manifold and / or to an element interposed along the length of the exhaust pipe.

Description

1 2621075

  The present invention relates to an end flange pipe for the exhaust gases of an engine

  vehicle, and in particular, although not ex-

  clusively, to the flange provided for connection to the exhaust manifold of the engine. Currently, the blocking system between

  engine exhaust manifold and exhaust pipe

  which leads to the silencer generally uses a

  screw-and-nut connection between the respective end flanges, and the connection between the exhaust pipe and its respective end flange is carried out by

  for example, by plastic deformation of these elements.

  The object of the present invention is to provide an end flange pipe for the exhaust gas of a vehicle engine which shows an improvement compared with prior solutions, already known,

  connection between the flange and the pipe, and which, more

  precisely, has a relatively simple actuation mode and a very high functional efficiency

  linkage, and this with a manufacturing cost

  moth. According to the invention, a flanged pipe is produced

  end-piece for the exhaust gases of a combustion engine.

  characterized in that said pipe has, for attachment to the flange, at least one laser welding zone. Figures in the attached drawing, given only

  by way of example, make it clear how

  vention can be realized. In this drawing, FIG. 1 is a front view of a first embodiment of an exhaust pipe.

  assembled to an end flange provided for the connection

  the engine manifold, realized in accordance with the principle of the invention; Figure 2 is a sectional view along the plane II-II of the flanged pipe of Figure 1; FIG. 3 is a variant of the form of

  embodiment shown in Figure 2.

  In Figures 1 and 2, it is indicated by the

  1 a metal pipe used to evacuate gases

  exhaust to a silencer, and whose initial segment

  tial is mounted in a through hole 2 defined in an end flange 3 which serves to connect the pipe to a

  exhaust manifold (not shown for simplicity

  proud) of the endothermic engine of a vehicle. This bridle

  3 has holes 5 intended to give

  to screws (not shown) for fastening to the flange

  exhaust manifold. Between pipe 1 and the

  of 3, is interposed a metal sleeve 4, long

  relatively reduced and which, according to the invention, is fixed by laser welding, both at the flange 3 and the pipe 1; in particular, between the sleeve 4 and the flange 3, two circumferential welds 7 and 8 have been produced on both sides, respectively upper and lower.

  lower flange 3, and a circumferential weld-

  the 9 is made between the sleeve 3 and the pipe 1, on the front edges of this sleeve and this pipe which are aligned on the upper face of the flange 3. These laser welds can suitably be executed

  with appliances of a conventional type.

  In Figure 3, there is shown an alternative embodiment in which the sleeve 4 is missing and o the pipe 1 is directly assembled to the flange 3 by two laser circumferential welds 7 'and 8' which are here also performed on both sides , superior

and lower, of the flange 3.

  The embodiment of the invention which is described thus has the advantage of making it possible to obtain a

  connection between the exhaust pipe and the end flange

  which has maximum effectiveness in this respect

  that it guarantees a perfect seal against escaping gases.

  and its execution can be automated, this with all the advantages derived from it in terms of reducing production time and costs and without

  ask for specialized labor.

  It goes without saying that many modifications and variations may be made by those skilled in the art to the devices which have just been described by way of non-limiting examples, in particular by substituting the equivalent technical means, without it goes beyond the scope of the invention. Among others, the flange 3

  may be, no Das the connection flange to the

  motor exhaust but, on the contrary, a

  connection to elements interposed on the length

exhaust pipe.

Claims (4)

R E V E N D I C A T IONS   1 - Pipe (1) provided with an end flange (3),   for the exhaust gases of the engine of a vehicle,   characterized in that said pipe (1) has, for the   fastening to said flange (3), at least one weld zone   laser re (9; 7 ', 8'). 2 - Pipe according to claim 1, characterized in that said laser welding zone (9; 7 ', 8')   is circumferentially formed on said pipe (1).   3 - Pipe according to claim 1 or 2, characterized   characterized in that it comprises laser welding zones (7, 8, 7 ', 8') on both sides of said flange (3).   4 - Pipe according to one of the preceding claims   characterized in that, between said pipe (1) and a hole (2) formed in said flange (3) and wherein said pipe (1) is inserted, is interposed a sleeve (4) which has at least one zone laser welding   (7, 8, 9), both on the side directed towards the said   (3) only on the directional side towards said pipe (1).