초록 ▼

A fuel vapor control apparatus halts deterioration in operating characteristics of a fuel control valve at the time of fuel supply and prevents fuel vapor from being discharged into the atmosphere through a filler pipe. The fuel vapor control apparatus prohibits fuel vapor from flowing toward a fill

A fuel vapor control apparatus halts deterioration in operating characteristics of a fuel control valve at the time of fuel supply and prevents fuel vapor from being discharged into the atmosphere through a filler pipe. The fuel vapor control apparatus prohibits fuel vapor from flowing toward a filler pipe by closing a fuel drop passage at the time of fuel supply. A fuel vapor control valve is configured as a diaphragm valve made of a flexible material, and a diaphragm holder moving integrally with the diaphragm valve is provided at the center thereof. Furthermore, the fuel drop passage as a communication hole is formed in the diaphragm portion at a location radially outward of the diaphragm holder, which is provided with an umbrella portion for opening and closing the fuel drop passage.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel vapor control apparatus comprising:a fuel tank;a filler pipe having one end connected with said fuel tank and another end cooperable with a filler cap;a canister for adsorbing fuel vapor generated in said fuel tank;a fuel vapor control valve disposed in a passage t

[ What is claimed is:] [1.] A fuel vapor control apparatus comprising:a fuel tank;a filler pipe having one end connected with said fuel tank and another end cooperable with a filler cap;a canister for adsorbing fuel vapor generated in said fuel tank;a fuel vapor control valve disposed in a passage that allows communication between said fuel tank and the canister and divided into an upper chamber and a lower chamber, said fuel vapor control valve being opened or closed due to a difference in pressure between the upper chamber and the lower chamber;a fuel drop passage allowing communication between said upper chamber and said lower chamber; anda line connecting an inside of said upper chamber with a portion close to an end of said filler pipe near the filler cap,wherein said fuel vapor control valve has a valve mechanism that opens said fuel drop passage when substantially equal pressures are applied to said upper chamber and said lower chamber and closes said fuel drop passage when said lower chamber is higher in pressure than said upper chamber, before the fuel vapor control valve is opened.