Muffler
AssigneePurem GmbH
InventorsMartin Wagmann, Felix Hackländer
Life of this patent
Estimating the term…
Abstract
A muffler for an exhaust system of an internal combustion engine includes at least one muffler component with a perforation defined by a plurality of through-flow openings in a wall of the muffler component. The through-flow openings can be flowed through in a flow direction in the direction from an upstream side of the wall to a downstream side of the wall. At least in the case of some or all of the through-flow openings of the perforation, a through-flow opening flow cross section decreases in the flow direction in order to provide a through-flow opening flow-guiding surface.
Claims12
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 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.
An exhaust system for an internal combustion engine, the exhaust system comprising:
- an exhaust gas conduit pipe for conducting exhaust gas from the internal combustion engine;
- a muffler connected to said exhaust gas conduit pipe;
- said muffler including:
- at least one muffler component including a wall having a perforation defined by a plurality of through-flow openings formed therein;
- 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.
A method of making a muffler for an exhaust system of an internal combustion engine, the muffler including at least one muffler component including a wall having a perforation defined by a plurality of through-flow openings formed therein;
- 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;
- 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;
- the method comprising:
- making the at least one muffler component with metal material;
- and,
- forming rim holes in the wall of said at least one muffler component in order to provide the through-flow opening flow guide surface;
- or,
- configuring the at least one muffler component as a plastic molding;
- and,
- molding the through-flow opening flow-guide surfaces onto the wall of the at least one muffler component.
Dependencies are inferred from the claim text.