A valve device used by being attached to a fuel tank includes a case provided with an airflow valve opening which communicates with the outside of the tank, on an upper portion, and also provided with a fuel inflow section located on a lower side of the airflow valve opening, and a float body housed
A valve device used by being attached to a fuel tank includes a case provided with an airflow valve opening which communicates with the outside of the tank, on an upper portion, and also provided with a fuel inflow section located on a lower side of the airflow valve opening, and a float body housed in the case so as to be vertically movable, and also seated in the airflow valve opening by being elevated by the fuel flowed into the case through the inflow section. In the case, an airflow section which interconnects the inside of the tank and the inside of the case is formed in a higher side than a waterline of the float body at the seating time, and also at the seating time, this airflow section is restricted.
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1. A valve device for a fuel tank attached to the fuel tank, comprising: a case having an airflow valve opening which communicates with an outside of the tank, on an upper portion, and a fuel inflow section located on a lower side of the airflow valve opening; anda float body housed in the case so a
1. A valve device for a fuel tank attached to the fuel tank, comprising: a case having an airflow valve opening which communicates with an outside of the tank, on an upper portion, and a fuel inflow section located on a lower side of the airflow valve opening; anda float body housed in the case so as to be vertically movable, and seated in said airflow valve opening by being elevated by fuel flowing into the case through said inflow section when the fuel in the tank reaches the fuel inflow section,wherein the case includes an airflow section which interconnects an inside of the tank and an inside of the case at a higher side than a waterline of the float body at a seating time of the float body to the airflow valve opening, and at said seating time, the airflow section is restricted. 2. A valve device for a fuel tank according to claim 1, wherein the airflow section comprises a main airflow section and a sub-airflow section, and at the seating time of the float body, the main airflow section is blocked and a pressure inside the tank and a pressure inside the case are gradually balanced by the sub-airflow section. 3. A valve device for a fuel tank according to claim 2, wherein a flow passage cross-sectional area of the sub-airflow section is smaller than a flow passage cross-sectional area of the main airflow section. 4. A valve device for a fuel tank according to claim 2, wherein at the seating time of the float body, the main airflow section is blocked by the float body. 5. A valve device for a fuel tank according to claim 1, wherein one portion of the float body is inserted into the airflow section at the seating time so that the airflow section is restricted. 6. A valve device for a fuel tank according to claim 5, wherein at the seating time, one portion of the float body is inserted into the airflow section from a lower side, and one portion of the float body comprises a portion whose transverse area is the largest between upper and lower ends thereof. 7. A valve device for a fuel tank according to claim 5, wherein at the seating time, one portion of the float body is inserted into the airflow section from a lower side, and the airflow section comprises a portion whose flow passage is the narrowest between upper and lower openings thereof. 8. A valve device for a fuel tank according to claim 1, wherein the airflow section includes a notch portion which is formed in the case and opened upwardly and laterally, and one portion of the float body is inserted into the notch portion at the seating time so that the airflow section is restricted. 9. A valve device for a fuel tank according to claim 1, wherein the airflow section includes a depressed portion formed in an upper portion of the case, and through-holes formed on sidewalls of this depressed portion, and one portion of the float body is inserted into the depressed portion at the seating time so that the airflow section is restricted. 10. A valve device for a fuel tank according to claim 1, wherein by a sub-float which is elevated most at the seating time of the float body, the airflow section is restricted. 11. A valve device for a fuel tank according to claim 1, further comprising a flange to which the case is attached, the flange being formed separately from the case and including a cylindrical connecting portion having an airflow hole communicating with an inside of the tank, and a space formed between an inside of the flange and an outside of the case so that the airflow section communicates with the inside of the tank through the space and the airflow hole. 12. A valve device for a fuel tank according to claim 11, wherein the case includes a top plate portion forming the upper portion, and a side portion extending downwardly from the top plate portion to thereby form an upper space above the top plate and a groove portion between the side portion and the cylindrical connecting portion. 13. A valve device for a fuel tank according to claim 12, wherein the top plate portion includes a main airflow section, which is closed by the float body when the airflow valve opening is closed, and the side portion includes a sub-airflow section, which is not closed by the float body. 14. A valve device for a fuel tank according to claim 11, wherein the airflow section in the case communicating with the space is at least partly closed by the float body when the airflow valve opening is closed. 15. An overfilling preventing device for a fuel tank, comprising: an interconnection device interconnecting a space on a fuel liquid surface inside the fuel tank and an outside of the tank and having a case with an airflow valve opening;a fueling stop device which allows a fuel liquid level inside a filler pipe to elevate by elevating a pressure inside the tank by blocking interconnection due to said interconnection device using elevation of the fuel liquid level by pouring fuel into the tank, and allows a sensor of a fueling gun to detect a full tank, the fueling stop device being disposed inside the case;a decompression device for the pressure inside the tank which creates decline of the fuel liquid level inside the filler pipe after the detection of this full tank; anda delay device delaying the decline of the fuel liquid level inside the filler pipe by this decompression device;wherein the interconnection device interconnects an inside of the tank and an inside of the case at a higher side than a fuel liquid level of the fuel stop device at a seating time of the fuel stop device to the airflow valve opening, and at said seating time, the airflow section is restricted.
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이 특허에 인용된 특허 (10)
Mills,Vaughn K., Controlling vapor emission in a small engine fuel tank system.
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