Flexible line segment for the exhaust system of an internal combustion engine
AssigneesWitzenmann GmbH, Eberspächer Exhaust Technology GmbH & Co. KG
InventorsJens Barthold, Frank Berson, Jorg Ludwig, Rene Rosler, Silvia Calvo, Heike Tobben
Life of this patent
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Abstract
A flexible line segment for the exhaust system of an internal combustion engine, with an annularly corrugated or helically corrugated metallic bellows, for exhaust gas flow therethrough, and a line segment arranged upstream in reference to the metallic bellows, with a precipitation device provided in the line section, arranged upstream in reference to the metallic bellows or mounted thereat. The precipitation device is provided for urea derivatives or urea entrained in an edge layer of the exhaust gas flow from an oversaturated edge layer of the exhaust gas flow.
Claims14
A flexible pipe element for the exhaust system of an internal combustion engine comprising:
- an annularly corrugated or helically corrugated metallic bellows (11) adapted for a flow of exhaust gas (4) therethrough, a line section (1) arranged upstream in reference to the metallic bellows (11), at least one precipitation device (2, 5, 6, 7, 9, 13, 14, 16, 17, 18) for precipitating urea derivatives out from an edge layer (3) of the exhaust gas flow (4) or for precipitating urea that is entrained in an oversaturated edge layer (3) of said exhaust gas flow (4), or both, arranged upstream in reference to the metallic bellow (11), wherein the precipitation device comprises a solid annular flow obstruction (6) having an inner diameter and having a clear open cross-section extending across an entirety of the inner diameter of the solid annular flow obstruction.
A flexible pipe element for the exhaust system of an internal combustion engine comprising:
- an annularly corrugated or helically corrugated metallic bellows (11) adapted for a flow of exhaust gas (4) therethrough, a line section (1) arranged upstream in reference to the metallic bellows (11), at least one precipitation device (2, 5, 6, 7, 9, 13, 14, 16, 17, 18) for precipitating urea derivatives out from an edge layer (3) of the exhaust gas flow (4) or for precipitating urea that is entrained in an oversaturated edge layer (3) of said exhaust gas flow (4), or both, arranged upstream in reference to the metallic bellow (11), wherein the precipitation device comprises an annular flow obstruction (6) formed by a mesh ring or perforated ring with a material of the mesh ring or the perforated ring extending radially inwardly by a first distance from an outer wall of the line section only partially into a cross-sectional area of the line section to define an inner diameter of the annular flow obstruction, and a clear open cross-section extends across an entirety of the inner diameter of the annular flow obstruction, the clear open cross-section having a diameter that is greater than the first distance.
Dependencies are inferred from the claim text.