US 12,467,392 B2
Muffler, exhaust system including a muffler, and method of making a muffler for an exhaust system
Martin Wagmann, St. Wendel (DE); and Felix Hackländer, Esslingen (DE)
Assigned to Purem GmbH, Neunkirchen (DE)
Filed by Purem GmbH, Neunkirchen (DE)
Filed on Jun. 8, 2023, as Appl. No. 18/331,775.
Claims priority of application No. 10 2022 114 527.1 (DE), filed on Jun. 9, 2022.
Prior Publication US 2023/0399963 A1, Dec. 14, 2023
Int. Cl. F01N 1/08 (2006.01); F01N 13/18 (2010.01)
CPC F01N 1/089 (2013.01) [F01N 13/1861 (2013.01); F01N 2470/02 (2013.01); F01N 2490/08 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A muffler for an exhaust system of an internal combustion engine, the muffler comprising:
at least one muffler component including a wall having a perforation defined by a plurality of through-flow openings formed therein, said through-flow openings defining an opening center axis (O);
said wall having an upstream side and a downstream side;
said through-flow openings being provided to accommodate a flowthrough in a flow direction(S) in a direction from said upstream side to said downstream side of said wall; and,
at least a portion of said through-flow openings each being configured to have a through-flow opening flow cross section decreasing in said flow direction(S) to provide a through-flow opening flow-guide surface, said through-flow opening flow-guide surfaces and a corresponding one of said opening center axes (O) conjointly defining an angle lying in a range of from 5° to 15° in the region of an outlet end of the corresponding through-flow opening.