| 摘要 |
PROBLEM TO BE SOLVED: To provide an air current noise reduction device for an internal combustion engine capable of reducing air current noise without dropping functions of an exhaust throttle valve. SOLUTION: This air current noise reduction device for an internal combustion engine is applied to an internal combustion engine provided with an exhaust throttle valve 2 including a rotary shaft 2a arranged to cross an exhaust passage 1, and a valve element 2b provided to rotate as one unit with the rotary shaft 2a and forming a gap with the exhaust passage 1 when it is fully closed. The device is provided with a straightening member 10 partitioning an inside of the exhaust passage 1 to form a plurality of passage groups 13 including a pair of passages 11 of same length arranged at downstream of the exhaust throttle valve 2 and extending in a same direction as the exhaust passage 1 therein. One of the pair of passages 11 is an open passage 11b opened at both of an inlet and an outlet and another is a blocked passage 11a of which the outlet is blocked by a plug 12. COPYRIGHT: (C)2009,JPO&INPIT
|
