EP 1137874 A1 20011004 - 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: US2002017275A1] An air duct for inclusion in the air intake tract of an internal combustion engine in which flow obstacles, especially wire-shaped flow obstacles, are arranged in the vicinity of the duct wall (21) in order to improve the acoustic characteristics of the duct. The flow obstacle may, for example, be wire strands (29). The flow obstacles are capable of decreasing the acoustic noise emitted by the air duct while maintaining a low flow resistance since the center part of the duct cross-section remains unaffected by the flow obstacles. The flow obstacles may advantageously be arranged in the discharge area of flap valves since so that the valves are prevented from whistling when they are only open a small way. In order to simplify the manufacturing and assembly costs, the flow obstacles may be disposed in the area of a flanged joint in the air intake duct.
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)
Citation (search report)
See references of WO 0034642A1
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)
US 2002017275 A1 20020214; AT E228613 T1 20021215; DE 19856521 A1 20000615; DE 59903602 D1 20030109; EP 1137874 A1 20011004; EP 1137874 B1 20021127; JP 2002531767 A 20020924; JP 4420567 B2 20100224; WO 0034642 A1 20000615
DOCDB simple family (application)
US 87529101 A 20010607; AT 99947393 T 19990921; DE 19856521 A 19981208; DE 59903602 T 19990921; EP 9906975 W 19990921; EP 99947393 A 19990921; JP 2000587066 A 19990921