Exhaust system
AssigneeEberspächer Exhaust Technology GmbH & Co. KG
InventorsFelix Neumann, Viktor Koch
Life of this patent
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Abstract
An exhaust system (1) for an internal combustion engine, in particular of a motor vehicle, has at least one exhaust tract (2), which has at least one exhaust pipe (3) which conducts exhaust gas, and has at least one active silencer (5). The active silencer (5) has a silencer housing (6) and at least one electro-acoustic converter (7), which is arranged in the silencer housing (6). At least one connection pipe (8) connects the silencer housing (6) fluidically to the exhaust pipe (3). The thermal loading of the converter (7) can be reduced if a sound propagation path (9) formed for the propagation of airborne noise in the connection pipe (8) is impermeable to thermal radiation (16) emanating from the exhaust gas in the exhaust pipe (3).
Claims20
An exhaust system for an internal combustion engine of a motor vehicle, the system comprising:
- an exhaust tract comprising at least one exhaust pipe which conducts exhaust gas;
- and
- an active silencer comprising a silencer housing and an electro-acoustic converter arranged in the silencer housing and a connection pipe which connects the silencer housing fluidically to the exhaust pipe;
- a cooler section located between the silencer housing and the exhaust pipe;
- a plurality of screen elements which each project inwardly from said cooler section, said screen elements being exposed to the exhaust gas, wherein heat is transferred from said screen elements to an outer surface of said cooler section, each of said plurality of screen elements being permeable to airborne noise, said plurality of screen elements cooperating to close off a cross section of said connection pipe in an opaque manner such that a line of sight path is blocked in a viewing direction extending parallel to a longitudinal center axis of said connection pipe, wherein a sound propagation path, formed in the connection pipe for the propagation of airborne noise, is impermeable to thermal radiation emanating from the exhaust gas in the exhaust pipe via at least said plurality of screen elements.
An exhaust system for an internal combustion engine, the system comprising:
- an exhaust pipe which conducts exhaust gas from the internal combustion engine;
- an active silencer comprising a silencer housing and an electro-acoustic converter arranged in said silencer housing and a sound propagation path comprising connection pipe, said sound propagation path connecting said silencer housing fluidically to said exhaust pipe;
- and
- a thermal radiation blocking means, connected to said sound propagation path, for blocking thermal radiation emanating from the exhaust gas from reaching said silencer housing whereby thermal radiation is prevented from passing from an exhaust gas stream in the exhaust pipe or from the exhaust pipe through the connection pipe to the converter, said thermal radiation blocking means comprising a tubular body and a plurality of screen elements, said tubular body being integrally connected to said plurality of screen elements to form a one-piece structure, said plurality of screen elements being exposed to the exhaust gas, each of said screen elements being permeable to airborne noise, said plurality of screen elements closing off a line of sight path of said connection pipe in a viewing direction extending parallel to a longitudinal center axis of said connection pipe.
Dependencies are inferred from the claim text.