Muffler and method for making a muffler

A method for making an exhaust muffler, comprising the steps of:

• a) providing at least one muffler insert with at least one retaining wall and with at least one retaining-wall opening in the at least one retaining wall;
• b) providing at least one multi-part first exhaust-gas routing pipe with a first pipe part and with a second pipe part;
• c) arranging the second pipe part of the at least one first exhaust-gas routing pipe so as to cause said at least one first exhaust-gas routing pipe to be positioned to engage in a retaining-wall opening of the at least one retaining wall of the at least one muffler insert;
• d) securing the second pipe part of the at least one first exhaust-gas routing pipe to the at least one retaining wall by material closure,
• e) surrounding the at least one muffler insert and the second pipe part, secured to the at least one muffler insert, of the at least one first exhaust-gas routing pipe by a peripheral wall of a muffler housing, a peripheral-wall opening being provided in the peripheral wall, assigned to the at least one first exhaust-gas routing pipe;
• f) arranging the first pipe part of the at least one first exhaust-gas routing pipe so as to cause the at least one first exhaust-gas routing pipe to be positioned to engage in the peripheral-wall opening provided, assigned to the at least one exhaust-gas routing pipe, and in that the first pipe part and the second pipe part, secured to the at least one retaining wall of the at least one muffler insert, of the at least one first exhaust-gas routing pipe are inserted into one another and overlap in a longitudinal direction of the at least one first exhaust-gas routing pipe;
• and,
• g) connecting the first pipe part to the second pipe part of the at least one first exhaust-gas routing pipe by at least one of the following:
• radial widening of the first pipe part;
• and, radial widening of the second pipe part at least in their overlapping longitudinal regions.

An exhaust system for an internal combustion engine, the exhaust system comprising:

• a muffler including a muffler housing defining a longitudinal axis (L) and having a peripheral wall elongated along said longitudinal axis (L);
• said peripheral wall having first and second end regions and first and second end walls at said first and second end regions, respectively;
• a muffler insert surrounded by said peripheral wall and supported thereon;
• said muffler insert having at least one retaining wall extending substantially in a direction of said longitudinal axis (L);
• said peripheral wall having a peripheral wall opening;
• at least one first exhaust-gas routing pipe having a first end region and being positioned with said first end region thereof engaging in said peripheral wall opening and being secured to said peripheral wall;
• said at least one first exhaust-gas routing pipe having a second end region and being secured by said second end region thereof to said at least one retaining wall;
• said at least one first exhaust-gas routing pipe having a first pipe part defining said first end region and positioned so as to engage in said peripheral wall opening and being secured to said peripheral wall;
• said at least one first exhaust-gas routing pipe having a second pipe part defining said second end region thereof secured to said at least one retaining wall;
• said first pipe part and said second pipe part having respective mutually adjoining longitudinal regions and having been pushed one into the other at said longitudinal regions thereof;
• said first pipe part and said second pipe part mutually overlapping in a longitudinal direction of said at least one first exhaust-gas routing pipe;
• and,
• said second pipe part being connected to said at least one retaining wall via material closure.