| 摘要 |
PROBLEM TO BE SOLVED: To inhibit rise of ventilation resistance while improving filtering performance. SOLUTION: A dust filter 40 is provided with a downstream side filter member 64 collecting duct contained in air flowing in an atmospheric air introduction route in an evaporating fuel treatment device, an upstream side filter member 67 arranged in an upstream side of the downstream side filter member 64 and having coarser mesh than mesh of the downstream side filter member 64, and a bypass passage 57 bypassing part of air flowing to an upstream side of the downstream side filter member 64 from upstream side of the upstream side filter member 67. COPYRIGHT: (C)2008,JPO&INPIT
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