EP 1137874 B1 20021127 - AIR DUCT, ESPECIALLY FITTED IN THE AIR INTAKE SYSTEM OF AN INTERNAL COMBUSTION ENGINE
Title (en)
AIR DUCT, ESPECIALLY FITTED IN THE AIR INTAKE SYSTEM OF AN INTERNAL COMBUSTION ENGINE
Title (de)
LUFTLEITUNG, INSBESONDERE IM ANSAUGTRAKT EINER BRENNKRAFTMASCHINE
Title (fr)
CONDUITE D'AIR PLACEE NOTAMMENT DANS LA ZONE D'ADMISSION D'UN MOTEUR A COMBUSTION INTERNE
Publication
Application
Priority
- DE 19856521 A 19981208
- EP 9906975 W 19990921
Abstract (en)
[origin: DE19856521A1] The invention relates to an air duct, especially for fitting in the air intake system of an internal combustion engine. In order to improve the acoustic behavior, flow obstacles, preferably wire-shaped flow obstacles, are accommodated in the vicinity of the tube wall (21). Said obstacles may, for instance, consist of wire strings (29). The flow obstacles are capable of reducing the acoustic behavior in the duct at a low flow resistance since the center part of the cross-section remains unaffected by the flow obstacles. The flow obstacles may advantageously be fitted in the exhaust air area of flaps in order to prevent a whistling from being produced when the flaps are slightly open. In order to simplify production, the flow obstacles are provided in the area of a flanged joint in the air intake system.
IPC 1-7
IPC 8 full level
F02M 35/10 (2006.01); F02D 9/10 (2006.01); F02M 29/04 (2006.01); F02M 35/12 (2006.01)
CPC (source: EP US)
F02D 9/104 (2013.01 - EP US); F02M 29/04 (2013.01 - EP US); F02M 35/1211 (2013.01 - EP US); F02M 35/1216 (2013.01 - EP US); F02M 35/1283 (2013.01 - EP US); F02D 9/107 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DE 19856521 A1 20000615; AT 228613 T 20021215; DE 59903602 D1 20030109; EP 1137874 A1 20011004; EP 1137874 B1 20021127; JP 2002531767 A 20020924; JP 4420567 B2 20100224; US 2002017275 A1 20020214; WO 0034642 A1 20000615
DOCDB simple family (application)
DE 19856521 A 19981208; AT 99947393 T 19990921; DE 59903602 T 19990921; EP 9906975 W 19990921; EP 99947393 A 19990921; JP 2000587066 A 19990921; US 87529101 A 20010607