VAPORIZED FUEL TREATMENT DEVICE
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United States of America Patent
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Issued Date -
Dec 29, 2016
app pub date -
Sep 4, 2014
filing date -
Dec 17, 2013
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Abstract
A vaporized fuel treatment device has formed therein a passage (3) through which fluid can flow. The passage (3) comprises a primary chamber (21) which is provided with a primary adsorption layer (11) and a secondary chamber (22) which is located on the atmosphere port (6) side of the primary chamber (21). The secondary chamber (22) has a first adsorption layer (12), a second adsorption layer (13), and a third adsorption layer (14), which are provided serially from the primary adsorption layer (11) side. The secondary chamber (22) also has separation sections (31, 32) for separating the adjacent adsorption layers. With respect to the volume of the primary adsorption layer (11), the volume of the first adsorption layer (12) is set in the range of 4.0% to 8.5%, inclusive, the volume of the second adsorption layer (13) is set in the range of 1.2% to 3.0%, inclusive, and the volume of the third adsorption layer (14) is set in the range of 0.9% to 2.2%, inclusive. Consequently, the amount of blowing of vaporized fuel discharged from the atmosphere port to the atmosphere is reduced to a low level.
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