Silencer and method for manufacturing the same

Abstract

The invention relates to a silencer ( 1 ), in particular a vehicle silencer, having a continuous pipe ( 2 ) as well as a first resonator chamber ( 14 ) and a second resonator chamber ( 15 ) each surrounding the pipe ( 2 ) and being arranged one behind the other, with the shell ( 3 ) of the pipe ( 2 ) having at least one first opening ( 7 ) which opens into the first resonator chamber ( 14 ), and at least one second opening, which opens into the second resonator chamber ( 15 ). In order to allow a more flexible manufacturability, the resonator chambers ( 14, 15 ) are formed from a first housing part ( 4 ) and a second housing part ( 5 ), each having a shell embodied around an axis, and the length of the shell of the one housing part ( 4; 5 ), as seen in axial direction, is at least the half of the length of the other housing part ( 5; 4 ), and the housing parts ( 4, 5 ) are slid inside each other and overlap their shells at least in parts, and in the overlapping region ( 6 ), the shell exterior face ( 4 a ) of the first housing part ( 4 ) rests against the shell interior face ( 5 b ) of the second housing part ( 5 ), and in at least the overlapping region ( 6 ), the shell exterior face ( 4 a ) of the first housing part ( 4 ) and the shell interior face ( 5 b ) of the second housing part ( 5 ) each have a constant cross-section as seen in axial direction, and the housing parts ( 4, 5 ) have a recess on each side facing away from the overlapping region ( 6 ), which recess the pipe ( 2 ) passes through.

1 . Silencer ( 1 ), in particular a vehicle silencer, having a pipe ( 2 ) forming a flow duct and having a first resonator chamber ( 14 ) and a second resonator chamber ( 15 ), each surrounding the pipe ( 2 ) and being arranged one behind the other in axial direction, with the pipe ( 2 ) having in its shell ( 3 ) at least one first opening ( 7 ) which opens into the first resonator chamber ( 14 ), and at least one second opening ( 8 ) which opens into the second resonator chamber ( 15 ), wherein the resonator chambers ( 14 ,  15 ) are formed from a first housing part ( 4 ) and a second housing part ( 5 ) which each have a shell embodied around an axis, with—as seen in axial direction—the length of the shell of the one housing part ( 4 ;  5 ) being at least the half of the length of the shell of the other housing part ( 5 ;  4 ), and wherein the housing parts ( 4 ,  5 ) are slid inside each other and their shells overlap at least in parts, and in the overlapping region, the shell exterior face ( 4   a ) of the first housing part ( 4 ) rests against the shell interior face ( 5   b ) of the second housing part ( 5 ), and the shell exterior face ( 4   a ) of the first housing part ( 4 ) and the shell interior face ( 5   b ) of the second housing part ( 5 ) each have a constant cross-section as seen in axial direction, at least in the overlapping region ( 6 ), and wherein the housing parts ( 4 ,  5 ) each have a recess ( 21 ,  22 ) where the flow duct extends through. 
     
     
         2 . Silencer according to  claim 1 , wherein the majorities of the sections of the shell exterior face ( 4   a ) of the first housing part ( 4 ) and the shell interior face ( 5   b ) of the second housing part ( 5 ) each have a constant cross-section as seen in axial direction. 
     
     
         3 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) are each designed to be cylindrical, and the shell exterior face ( 4   a ) of the first housing part ( 4 ) and the shell interior face ( 5   b ) of the second housing part ( 5 ) each have a circular cross-section. 
     
     
         4 . Silencer according to  claim 1 , wherein as seen in axial direction, the length of the shell of the one housing part ( 4 ;  5 ) is at least two thirds, preferably three quarters, of the length of the shell of the other housing part ( 5 ;  4 ), and it is particularly preferred that the shells of the housing parts ( 4 ,  5 ) are essentially of the same length. 
     
     
         5 . Silencer according to  claim 1 , wherein at least in the overlapping region ( 6 ), preferably continuously, the shells of the housing parts ( 4 ,  5 ) have a constant shell thickness as seen in axial direction in each case. 
     
     
         6 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) have an end face ( 9 ,  10 ) on each side facing away from the overlapping region ( 6 ), in which end faces the recesses ( 21 ,  22 ) for the passage of the pipe ( 2 ) are formed. 
     
     
         7 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) are in each of their regions of their recesses ( 21 ,  22 ) connected to the pipe ( 2 ) in a manner airtight to the outside. 
     
     
         8 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) are welded to each other in their overlapping region ( 6 ). 
     
     
         9 . Silencer according to  claim 1 , wherein the shell of the one housing part ( 4 ) and the shell of the other housing part ( 5 ) each form a part of the external wall of the silencer ( 1 ). 
     
     
         10 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) seal the resonator chambers ( 14 ,  15 ) in a manner airtight to the outside. 
     
     
         11 . Silencer according to  claim 1 , wherein the shell lying outside in the overlapping region ( 6 ) has a beading ( 13 ) at its edge. 
     
     
         12 . Silencer according to  claim 1 , wherein in one of the housing parts ( 5 ), a separating wall ( 20 ) is situated which separates the resonator chambers ( 14 ,  15 ) from each other, and the separating wall ( 20 ) has a recess for the passage of the pipe ( 2 ). 
     
     
         13 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) are clamped between two profiles ( 16 ,  17 ) which are each situated at a pipe section ( 11 ,  12 ) extending outside the resonator chambers ( 14 ,  15 ). 
     
     
         14 . Silencer according to  claim 1 , wherein the housing parts ( 4 ,  5 ) are made of sheet metal, preferably of stainless steel sheet. 
     
     
         15 . Silencer according to  claim 1 , wherein the region of the pipe ( 2 ) surrounded by the resonator chambers ( 14 ,  15 ) is formed from a first part of pipe ( 2   a ) and a second part of pipe ( 2   b ) which are slid inside each other in their end regions, with the first housing part ( 4 ) surrounding the first part of pipe ( 2   a ), and the second housing part ( 5 ) surrounding the second part of pipe ( 2   b ). 
     
     
         16 . Silencer according to  claim 15 , wherein at least one of the parts of pipe ( 2   b ) is formed to be integral with the housing part ( 5 ) surrounding it, and is preferably made of a deep-drawn piece of sheet metal. 
     
     
         17 . Silencer according to  claim 16 , wherein the integrally formed part forms a projection ( 23 ) which rests against a pipe section ( 12 ) at least partially extending outside the resonator chambers ( 14 ,  15 ), and is held from outside by a profile ( 17 ), preferably a spring clip, so that the projection ( 23 ) is in radial direction arranged between the pipe section ( 12 ) and the profile ( 17 ). 
     
     
         18 . Silencer according to  claim 15 , wherein the separating wall ( 20 ) is integrally formed with one of the parts of pipe ( 2   a ,  2   b ), preferably with the part of pipe ( 2   a ) slid on the other part of pipe ( 2   b ), and is preferably made of a deep-drawn piece of sheet metal. 
     
     
         19 . Silencer according to  claim 1 , wherein at least one circumferentially extending sealing ring ( 24 ) is inserted in the overlapping section ( 6 ) between the shell exterior face ( 4   a ) of the first housing part ( 4 ) and the shell interior face ( 4   b ) of the second housing part ( 5 ). 
     
     
         20 . Silencer according to  claim 19 , wherein in the shell of the first housing part ( 4 ) and/or in the shell of the second housing part ( 5 ), an annularly extending holding ( 25 ) for the sealing ring ( 24 ) is embodied, with the holding ( 25 ) being preferably formed from a bow-shaped course of the shell. 
     
     
         21 . Vehicle ( 19 ), in particular a road vehicle, having a silencer ( 1 ), in particular a turbocharger silencer, which is arranged on the discharge side of a turbocharger ( 18 ), wherein the silencer ( 1 ) is a silencer according to  claim 1 . 
     
     
         22 . Method for manufacturing a silencer according to  claim 1 , having a pipe ( 2 ) forming a flow duct as well as a first resonator chamber ( 14 ) and a second resonator chamber ( 15 ) each surrounding the pipe ( 2 ) and being arranged one behind the other, with the pipe ( 2 ) in its shell ( 3 ) having at least one first opening ( 7 ) which opens into the first resonator chamber ( 14 ), and at least one second opening ( 8 ), which opens into the second resonator chamber ( 15 ), wherein for forming the resonator chambers ( 14 ,  15 ), a first housing part ( 4 ) and a second housing part ( 5 ) are provided each having a recess ( 21 ,  22 ) for the flow duct, and a shell embodied around an axis, and which can be telescopically slid inside each other along the axis, with the length of the shell of the one housing part ( 4 ;  5 ), as seen in axial direction, being at least the half of the length of the shell of the other housing part ( 5 ;  4 ), and with the shell exterior face ( 4   a ) of the first housing part ( 4 ) resting against the shell interior face ( 5   b ) of the second housing part ( 5 ) in different telescopic positions, and wherein for forming the resonator chambers ( 14 ,  15 ) and for adjusting a defined resonator volume of a resonator chamber ( 15 ), the prefabricated housing parts ( 4 ,  5 ) are telescopically slid inside each other to a corresponding extent. 
     
     
         23 . Method according to  claim 22 , wherein the housing parts ( 4 ,  5 ) are slid on the pipe ( 2 ), so that the pipe ( 2 ) passes through the recesses ( 21 ,  22 ) of the housing parts ( 4 ,  5 ). 
     
     
         24 . Method according to  claim 22 , wherein the housing parts ( 4 ,  5 ) are welded to each other in their overlapping region ( 6 ) after the resonator volume of a resonator chamber ( 14 ) has been adjusted by sliding the housing parts ( 4 ,  5 ) into each other. 
     
     
         25 . Method according to  claim 22 , wherein the prefabricated housing parts ( 4 ,  5 ) have an end face ( 9 ,  10 ) on each side facing away from the overlapping region ( 6 ), in which end face ( 9 ,  10 ) a recess ( 21 ,  22 ) corresponding to the external diameter of the pipe ( 2 ) is embodied, and wherein the housing parts ( 4 ,  5 ) are slid on the pipe ( 2 ) so that the at least one first opening ( 7 ) opens into the first resonator chamber ( 14 ) and the at least one second opening ( 8 ) opens into the second resonator chamber ( 15 ). 
     
     
         26 . Method according to  claim 22 , wherein the housing parts ( 4 ,  5 ) are prefabricated as pot-shaped parts the bottoms of which have the recess ( 21 ,  22 ) for the passage of the flow duct. 
     
     
         27 . Method according to  claim 22 , wherein one of the housing parts ( 5 ) is provided with a separating wall ( 20 ) which, in assembled state, separates the first resonator chamber ( 14 ) from the second resonator chamber ( 15 ). 
     
     
         28 . Method according to  claim 22 , wherein in the region surrounded by the resonator chambers ( 14 ,  15 ), the pipe ( 2 ) is formed from a first part of pipe ( 2   a ) and a second part of pipe ( 2   b ) which are slid inside each other in their end regions, with the first housing part ( 4 ) surrounding the first part of pipe ( 2   a ) and the second housing part ( 5 ) surrounding the second part of pipe ( 2   b ). 
     
     
         29 . Method according to  claim 28 , wherein at least one of the parts of pipe ( 2   b ) is formed to be integral with the housing part ( 5 ) surrounding it, preferably by deep-drawing a piece of sheet metal. 
     
     
         30 . Method according to  claim 22 , wherein in the overlapping region ( 6 ) at least one circumferentially extending sealing ring ( 24 ) is inserted between the shell exterior face ( 4   a ) of the first housing part ( 4 ) and the shell interior face ( 5   b ) of the second housing part ( 5 ).