Vaporized fuel treatment apparatus
In a vaporized fuel treatment apparatus a partition wall member is housed in an inner cap, and a gas-liquid separation chamber and a fuel adsorption chamber are defined on either side of the partition wall member. Further, a partition plate is provided on an open end of the inner cap. Wall portions are formed respectively on the partition wall member and the partition plate, and a conduction passage is defined in the fuel adsorption chamber by these wall portions. As a result, air containing vaporized fuel can be guided to every corner of the fuel adsorption chamber. Further, a through hole is provided in a central portion of the partition wall member, and therefore liquid fuel is prevented from flowing into the fuel adsorption chamber even when a fuel tank is tilted.
1. A vaporized fuel treatment apparatus that is attached to a filler neck of a fuel tank for use and adsorbs vaporized fuel from the fuel tank, comprising:
a housing attached to the filler neck; and
a cover member provided on an open end of the housing,
wherein, using a partition wall member housed in the housing as a boundary, a gas-liquid separation chamber is defined on a side of the filler neck and a fuel adsorption chamber housing an adsorbent is defined on a side of the cover member,
a wall portion that defines a conduction passage within the fuel adsorption chamber, the wall portion being formed on at least one of the cover member and the partition wall member, and
the vaporized fuel from the fuel tank is led from the gas-liquid separation chamber into the fuel adsorption chamber through a through hole formed in a central portion of the partition wall member, and then led to an outer peripheral portion of the housing, which communicates with the outside, through the conduction passage in the fuel adsorption chamber.
2. The vaporized fuel treatment apparatus according to claim 1 , wherein, as the wall portion, a cylindrical first wall portion is formed on the partition wall member and a cylindrical second wall portion having a different diameter dimension from the first wall portion is formed on the cover member.
3. The vaporized fuel treatment apparatus according to claim 1 , wherein, as the wall portion, a spiral wall portion is formed on at least one of the partition wall member and the cover member.
4. The vaporized fuel treatment apparatus according to claim 1 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber communicates with the fuel adsorption chamber via the buffer chamber.
5. The vaporized fuel treatment apparatus according to claim 2 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber communicates with the fuel adsorption chamber via the buffer chamber.
6. The vaporized fuel treatment apparatus according to claim 3 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber communicates with the fuel adsorption chamber via the buffer chamber.
7. A vaporized fuel treatment apparatus for attachment to a filler neck of a fuel tank to adsorb vaporized fuel from the fuel tank, comprising:
a housing configured for attachment to a filler neck;
a cover member releasably attachable to an open end of the housing; and
a partition wall member configured for reception in the housing, wherein
the partition wall member is configured for reception in the housing as a boundary arranged between a filler neck and the cover member in such a manner as to separate a space within the housing into a gas-liquid separation chamber on a filler-neck side of the partition wall member and a fuel adsorption chamber on a cover-member side of the partition wall member,
at least one of the cover member and the partition wall member includes a wall portion that is configured to define a conduction passage within the fuel adsorption chamber, and
the apparatus is configured such that, when attached to a filler neck of a fuel tank, there is defined a vaporized fuel passage leading from the fuel tank to the gas-liquid separation chamber, through the partition wall member, into the fuel adsorption chamber, and through the conduction passage in the fuel adsorption chamber, to an outer peripheral portion of the housing, and to an outside atmosphere.
8. The vaporized fuel treatment apparatus according to claim 7 , wherein, as the wall portion, a cylindrical first wall portion is formed on the partition wall member and a cylindrical second wall portion having a different diameter dimension from the first wall portion is formed on the cover member.
9. The vaporized fuel treatment apparatus according to claim 7 , wherein, as the wall portion, a spiral wall portion is formed on at least one of the partition wall member and the cover member.
10. The vaporized fuel treatment apparatus according to claim 7 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber is in fluid communication with the fuel adsorption chamber via the buffer chamber.
11. The vaporized fuel treatment apparatus according to claim 8 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber is in fluid communication with the fuel adsorption chamber via the buffer chamber.
12. The vaporized fuel treatment apparatus according to claim 9 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber is in fluid communication with the fuel adsorption chamber via the buffer chamber.
13. A vaporized fuel treatment apparatus for attachment to a filler neck of a fuel tank to adsorb vaporized fuel from the fuel tank, comprising:
a housing configured for attachment to a filler neck;
a cover member releasably attachable to an open end of the housing; and
a partition wall member configured for reception in the housing, wherein
the partition wall member is configured for reception in the housing as a boundary arranged between a filler neck and the cover member in such a manner as to separate a space within the housing into a gas-liquid separation chamber on a filler-neck side of the partition wall member and a fuel adsorption chamber on a cover-member side of the partition wall member,
at least one of the cover member and the partition wall member includes a wall portion that is configured to define a conduction passage within the fuel adsorption chamber,
the apparatus is configured such that the fuel absorption chamber may be filled with fuel vapor absorbent material through the open end of the housing while the partition wall member is received in the housing, and
the apparatus is configured such that, when attached to a filler neck of a fuel tank, there is defined a vaporized fuel passage leading from the fuel tank to the gas-liquid separation chamber, through the partition wall member, into the fuel adsorption chamber and through the conduction passage in the fuel adsorption chamber, to an outside atmosphere.
14. The vaporized fuel treatment apparatus according to claim 13 , wherein, as the wall portion, a cylindrical first wall portion is formed on the partition wall member and a cylindrical second wall portion having a different diameter dimension from the first wall portion is formed on the cover member.
15. The vaporized fuel treatment apparatus according to claim 13 , wherein, as the wall portion, a spiral wall portion is formed on at least one of the partition wall member and the cover member.
16. The vaporized fuel treatment apparatus according to claim 13 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber is in fluid communication with the fuel adsorption chamber via the buffer chamber.
17. The vaporized fuel treatment apparatus according to claim 14 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber is in fluid communication with the fuel adsorption chamber via the buffer chamber.
18. The vaporized fuel treatment apparatus according to claim 15 , wherein a buffer chamber is defined between the gas-liquid separation chamber and the fuel adsorption chamber, and the gas-liquid separation chamber is in fluid communication with the fuel adsorption chamber via the buffer chamber.