Muffler for an exhaust system
View Patent ↗A muffler ( 1 ) for an exhaust system of a motor vehicle internal combustion engine has a housing ( 2 ), with an exhaust gas inlet ( 4 ) and an exhaust gas outlet ( 5 ), including a circumferentially extending jacket ( 16 ) and end panels ( 14, 15 ) each axial ends. A chamber ( 18 ) in the housing interior ( 3 ), through which exhaust gas flows during operation, is axially limited by intermediate panels ( 20, 21 ) at axial ends. The thermal load on the jacket ( 16 ) is reduced with an insulating shell ( 29 ), arranged in the housing interior, extending in the circumferential direction ( 17 ) along the jacket ( 16 ). The two intermediate panels ( 20, 21 ) are supported on the insulating shell ( 29 ), each with an outer panel edge ( 30, 31 ). The insulating shell ( 29 ) is supported radially on the jacket ( 16 ) with a shell edge ( 33 ). An insulating gap ( 35 ) is formed radially between the jacket and the insulating shell.
1. A muffler for an exhaust system of an internal combustion engine of a motor vehicle, the muffler comprising:
a housing comprising a jacket extending circumferentially in a circumferential direction, a first axial end panel and a second axial end panel;
at least one exhaust gas inlet to the housing;
at least one exhaust gas outlet to the housing;
a first intermediate panel;
a second intermediate panel cooperating with the first intermediate panel to form a chamber, in the housing interior, through which exhaust gas flows during the operation of the exhaust system and which is axially limited by the first intermediate panel, at a first axial end, and by the second intermediate panel, at a second axial end; and
at least one insulating shell extending in the circumferential direction along the jacket in the housing interior, wherein:
the first intermediate panel is supported radially on the insulating shell with a first intermediate panel outer panel edge;
the second intermediate panel is supported radially on the insulating shell with a second intermediate panel outer panel edge;
the insulating shell is supported radially on the jacket with a shell edge;
an insulating gap is formed radially between the jacket and the insulating shell;
the insulating shell extends in the circumferential direction over less than 360°;
the insulating shell has a first shell section;
a first panel radial edge of the first intermediate panel is supported at the first shell section;
the insulating shell has a second shell section;
a second panel radial edge of the second intermediate panel is supported at the second shell section;
the jacket has a first jacket section;
a first panel radial edge of the first intermediate panel is supported at the first jacket section;
the jacket has a second jacket section; and
a second panel radial edge of the second intermediate panel is supported at the second jacket section.
2. A muffler in accordance with claim 1 , wherein the insulating shell is axially spaced from the first axial end panel and is axially spaced from the second axial end panel.
3. A muffler in accordance with claim 1 , wherein the insulating shell extends in the circumferential direction over a maximum of 180°.
4. A muffler in accordance with claim 1 , wherein the first intermediate panel has a step in which a shell edge passes through the first intermediate panel in an area of at least one transition between the first shell section and the first jacket section.
5. A muffler in accordance with claim 1 , wherein the insulating shell has a shell edge with at least one interruption in which the first intermediate panel extends up to the jacket and is supported radially on the jacket in the first jacket section with the panel edge.
6. A muffler in accordance with claim 1 , wherein the insulating shell has a shell edge that has two circumferential sections extending in the circumferential direction and two axially extending axial sections, which connect the two circumferential sections to one another.
7. A muffler in accordance with claim 1 , wherein the insulating shell has a shell edge that is shaped such that a linear contact is obtained between the shell edge and the jacket.
8. A muffler in accordance with claim 1 , wherein:
the at least one exhaust gas inlet is connected to a feed line, through which exhaust gas enters the chamber during the operation of the exhaust system;
the feed line has an open outlet end;
the at least one exhaust gas outlet is connected to a discharge line, through which exhaust gas leaves the chamber during the operation of the exhaust system;
the discharge line has an open inlet end; and
the chamber comprises at least one of a reflection chamber and an expansion chamber.
9. A muffler in accordance with claim 1 , wherein the at least one exhaust gas inlet opens through the jacket into the chamber.
10. A muffler in accordance with claim 8 , wherein the at least one exhaust gas inlet opens into the chamber opposite the insulating shell.
11. A muffler in accordance with claim 1 , wherein the at least one exhaust gas inlet passes through the jacket in an area of the jacket sections.
12. A muffler in accordance with claim 1 , further comprising insulating material arranged in the insulating gap.
13. A muffler in accordance with claim 11 , wherein:
the insulating shell comprises fixing sections, which mesh with the insulating material without touching the jacket; and
the fixing sections are bent out on the insulating shell.
14. A muffler in accordance with claim 1 , wherein:
the first intermediate panel is welded to the insulating shell;
the second intermediate panel is welded to the insulating shell; and
the insulating shell is supported loosely on the jacket.
15. A muffler for an exhaust system of an internal combustion engine of a motor vehicle, the muffler comprising:
a housing comprising a jacket extending circumferentially in a circumferential direction, a first axial end panel and a second axial end panel;
at least one exhaust gas inlet to the housing;
at least one exhaust gas outlet to the housing;
a first intermediate panel;
a second intermediate panel cooperating with the first intermediate panel to form a chamber, in the housing interior, through which exhaust gas flows during the operation of the exhaust system and which is axially limited by the first intermediate panel, at a first axial end, and by the second intermediate panel, at a second axial end; and
at least one insulating shell extending in the circumferential direction along the jacket in the housing interior, wherein:
the first intermediate panel is supported radially on the insulating shell with a first intermediate panel outer panel edge;
the second intermediate panel is supported radially on the insulating shell with a second intermediate panel outer panel edge;
the insulating shell is supported radially on the jacket with a shell edge;
an insulating gap is formed radially between the jacket and the insulating shell;
the first intermediate panel is welded to the insulating shell;
the second intermediate panel is welded to the insulating shell; and
the insulating shell is supported loosely on the jacket.