Exhaust conducting device and method for producing same

Abstract

An exhaust-gas conducting device of a vehicle has a cylindrical outer housing which is comprised of an outer shell and an inner shell arranged in an interior of the outer shell. The outer shell forms a larger portion of an outer circumference than the inner shell, or forms an equally large outer circumferential portion. A radial outside of the inner shell is attached to the outer shell, in particular by a material-to-material connection. The outer shell is C-shaped in cross-section, or extends in an annularly closed manner.

1 . An exhaust-gas conducting device of a vehicle comprising:
 a cylindrical outer housing which is comprised of an outer shell and an inner shell arranged in an interior of the outer shell, wherein the outer shell forms a larger portion of an outer circumference of the outer housing than the inner shell or an equally large portion of the outer circumference as the inner shell, a radial outside of the inner shell is attached to the outer shell, and the outer shell is C-shaped in cross-section or annularly closed.   
     
     
         2 . The device according to  claim 1 , wherein longitudinal edges of the outer shell extend with each other without overlapping. 
     
     
         3 . The device according to  claim 1 , wherein longitudinal edges of the outer shell are spaced from each other in circumferential direction and a resulting gap between the longitudinal edges is closed by the inner shell radially to the inside. 
     
     
         4 . The device according to  claim 1 , wherein as seen in cross-section the inner shell has a smaller circumferential length than the outer shell. 
     
     
         5 . The device according to  claim 1 , wherein the inner shell is C-shaped in cross-section and/or that a gap between longitudinal edges of the inner shell is aligned opposite to the longitudinal edges of the inner shell, in a circular cylindrical outer housing diametrically opposite to longitudinal edges of the outer shell. 
     
     
         6 . The device according to  claim 1 , wherein the outer shell is thicker than the inner shell. 
     
     
         7 . The device according to  claim 6 , wherein the outer shell has a thickness of not more than 0.8 mm and/or the inner shell has a thickness of not more than 0.4 mm. 
     
     
         8 . The device according to  claim 1 , wherein the outer shell is made of a material other than the inner shell. 
     
     
         9 . The device according to  claim 1 , wherein the outer shell forms at least 90% of the outer circumference of an outer housing in a circumferential direction. 
     
     
         10 . The device according to  claim 1 , wherein at least one longitudinal edge of the outer shell has at least one protrusion in a circumferential direction, which engages into a recess on an opposed longitudinal edge. 
     
     
         11 . The device according to any of the preceding claims, wherein longitudinal edges of the outer shell are soldered to each other and/or to the inner shell, and wherein the longitudinal edges are additionally spot-welded to the inner shell. 
     
     
         12 . The device according to  claim 11 , wherein the longitudinal edges of the outer shell are spaced from each other by forming a gap and the gap is filled with solder. 
     
     
         13 . The device according to  claim 1 , wherein curvatures of the inner and outer shells are adapted to each other such that an inside of the outer shell rests against an outside of the inner shell along a complete surface area of the inside of the outer shell. 
     
     
         14 . The device according to  claim 1 , wherein the exhaust conducting device is a prefabricated container with an inlet and an outlet. 
     
     
         15 . The device according to  claim 1 , wherein the exhaust conducting device is a pipe socket connection and the outer and the inner shells surround two adjacent pipe sockets and couples the pipe sockets in flow connection with each other or the exhaust conducting device is an exhaust pipe of an internal combustion engine that includes the outer and the inner shells. 
     
     
         16 . The device according to  claim 1 , wherein the outer shell completely covers the inner shell in an axial direction. 
     
     
         17 . A method for manufacturing an exhaust-gas conducting device of a vehicle comprising the following steps:
 a) positioning an outer shell and an inner shell relative to each other such that the outer shell extends around the inner shell in a C-shaped manner and the inner shell extends on an inside of the outer shell from one longitudinal edge to an opposed longitudinal edge of the outer shell, and   b) connecting the outer and the inner shell with each other in a region of the longitudinal edges of the outer shell.   
     
     
         18 . The method according to  claim 17 , wherein the outer and the inner shell are soldered to each other. 
     
     
         19 . The method according to  claim 18 , wherein on the inside of the outer shell in the region of the longitudinal edges, and/or on an outside of the inner shell, a solder is applied and cured before the inner and outer shells are positioned relative to each other, and that in step b) the material-to-material comprises solder that becomes liquid by heating at least one of the inner and outer shells, in order to solder the inner and outer shells to each other. 
     
     
         20 . The method according to  claim 17 , wherein the inner and outer shells are spot-welded to each other before soldering. 
     
     
         21 . The method according to  claim 17 , wherein that, wherein the inner and outer shells are pre-curved and positioned in a tool which includes inwardly movable jaws, and wherein the tool moves the jaws inwards against the outer shell, and at least further curves the outer shell, so that longitudinal edges of the outer shell are moved towards each other. 
     
     
         22 . The method according to  claim 21 , wherein the jaws are moved inwards by an individual adjustment path depending on a parameter determined individually for the exhaust conducting device to be manufactured. 
     
     
         23 . The method according to  claim 21 , wherein the outer and the inner shell are spot-welded to each other after moving the jaws inwards. 
     
     
         24 . The method according to  claim 18 , wherein the outer and the inner shell are moved in axial direction first through a first tunnel component, then through a continuous furnace, and finally through a second tunnel component. 
     
     
         25 . The method according to  claim 24 , wherein a stabilizing mandrel is provided, which with a tunnel opening of the second tunnel component defines an annular space through which the inner and outer shells are moved. 
     
     
         26 . The method according to  claim 17 , wherein the exhaust conducting device is a container with internals, with an inlet and an outlet, and an interposed portion expanded in cross-section towards the inlet and outlet, and wherein the outer and the inner shell are positioned around the internals and subsequently are connected with each other. 
     
     
         27 . The method according to  claim 17 , wherein the exhaust conducting device is a pipe socket connection which is positioned on an inlet-side and an outlet-side cylindrical pipe socket and subsequently connected with each other. 
     
     
         28 . The method according to  claim 17 , wherein the exhaust conducting device is an exhaust pipe of an internal combustion engine, the exhaust pipe comprising the outer and inner shell, which first are positioned relative to each other and subsequently are connected with each other. 
     
     
         29 . The device according to  claim 1 , wherein the cylindrical outer housing is formed only with the outer shell and the inner shell. 
     
     
         30 . The device according to  claim 1 , wherein the radial outside of the inner shell is attached to the outer shell by a material-to-material connection. 
     
     
         31 . The device according to  claim 1 , wherein the outer shell is thicker than the inner shell at least by a factor of 1.3. 
     
     
         32 . The device according to  claim 14 , wherein the prefabricated container contains an insert for cleaning the exhaust gas, forms a muffler, and/or contains TEG modules. 
     
     
         33 . The device according to  claim 1 , wherein as seen in cross-section the inner shell has a smaller circumferential length than the outer shell by at least a factor of 0.6. 
     
     
         34 . The device according to  claim 11 , wherein the longitudinal edges are additionally spot-welded to the inner shell. 
     
     
         35 . The method according to  claim 17 , wherein the outer and the inner shell are soldered to each other in a continuous process. 
     
     
         36 . The method according to  claim 17 , wherein step (b) further comprises material-to-material connecting the outer and the inner shell with each other in a region of the longitudinal edges of the outer shell.