| 摘要 |
PURPOSE: An intake silencer for a fuel cell vehicle and a manufacturing method thereof are provided to lower the sound pressure level of the total noise and to generate the difference of impedance because the flow section area from an extension pipe to a second connecting pipe is changed at the portion which the flow section area is drastically extended at the portion into a housing. CONSTITUTION: An intake silencer for a fuel cell vehicle is composed of a housing(1), a first connecting pipe(3), a perforated pipe(5), baffle(7), an extended pipe(9), and a second connecting pipe(11). The outside cross-sectional shape of the housing is regularly formed according to the flow direction of the air. The first connecting pipe connects one end of the housing to the intake pipe as the cross section smaller than the outside cross section. The perforated pipe is extended to the inside of the housing at the cross-sectional shape same as the first connecting pipe. The baffle air-tights a space formed between the outside of a perforated pipe wall and the inside of a housing wall in the end of the perforated pipe. The extended pipe is extended from the baffle to the inside of the housing and a free end is formed in the housing. The second connecting pipe is projected to the inside and outside of the housing after passing through the other end of the housing. The second connecting pipe is connected to the intake pipe at the air cleaner side.
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