Global Patent Index - EP 1137874 B1

EP 1137874 B1 2002-11-27 - 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

EP 1137874 B1 (DE)

Application

EP 99947393 A

Priority

  • DE 19856521 A
  • EP 9906975 W

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 (main, further and additional classification)

F02M 29/04; F02M 35/12

IPC 8 full level (invention and additional information)

F02M 35/10 (2006.01); F02D 9/10 (2006.01); F02M 29/04 (2006.01); F02M 35/12 (2006.01)

CPC (invention and additional information)

F02M 29/04 (2013.01); F02D 9/104 (2013.01); F02M 35/1211 (2013.01); F02M 35/1216 (2013.01); F02M 35/1283 (2013.01); F02D 9/107 (2013.01)

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

DE 19856521 A1 20000615; AT 228613 T 20021215; EP 1137874 A1 20011004; EP 1137874 B1 20021127; JP 2002531767 A 20020924; JP 4420567 B2 20100224; US 2002017275 A1 20020214; WO 0034642 A1 20000615