초록 ▼

A filler cap structure for a vehicular fuel tank particularly designed to prevent the discharge of fuel vapor to the ambient atmosphere and hence possible air pollution resulting therefrom upon filling of the fuel tank. The fuel tank has a filler tube closed by a filler cap. The filler tube is provi

A filler cap structure for a vehicular fuel tank particularly designed to prevent the discharge of fuel vapor to the ambient atmosphere and hence possible air pollution resulting therefrom upon filling of the fuel tank. The fuel tank has a filler tube closed by a filler cap. The filler tube is provided on its inner peripheral surface at a location inward of the bottom end of the filler cap with an annular seal seat. Defined by the annular seal seat, the inner peripheral surface of the fillter tube, and the bottom portion of the filler cap is an annular space which is connected through a communication tube with a canister. The annular space is sealed from the atmosphere by a first seal member disposed between the inner peripheral surface of the filler tube and the filler cap at a location outward of the annular space. The filler cap is provided on its bottom end with a second seal member which is adapted to be placed, upon complete closure of the filler cap against the filler tube, in sealing engagement with the annular seal seat on the inner peripheral surface of the filler tube for sealing of the fuel vapor in the fuel tank, the second seal member being moved away from the annular seal seat so as to place the fuel tank in communication with the canister when the filler cap is partially loosened.

대표청구항 ▼

A filler cap structure for a fuel tank, comprising: a filler cap having a plug member with upper and lower end and adapted to be fitted into a filler tube of a fuel tank; an annular seal member provided on the inner peripheral surface of the filler tube at a location inward of the bottom end of the

A filler cap structure for a fuel tank, comprising: a filler cap having a plug member with upper and lower end and adapted to be fitted into a filler tube of a fuel tank; an annular seal member provided on the inner peripheral surface of the filler tube at a location inward of the bottom end of the filler cap, the annular seat member including a seal seat adapted to be placed in intimate abutting engagement with the bottom end of the filler cap; an annular space defined by the annular seal member, the inner peripheral surface of the filler tube, and the bottom portion of the filler cap; a communication tube connected at its one end with the filler tube and at its other end with a canister for communicating the annular space with the canister for absorption of the fuel vapor introduced into the latter from the fuel tank; a first annular seal member mounted on said upper end of said plug member disposed between an upper inner peripheral surface of the filler tube and the filler cap at a location outward of the annular space for sealing the fuel vapor from the ambient atmosphere; and a second annular seal member mounted on said bottom end of said plug member and adapted to be placed, upon complete closure of the filler cap against the filler tube, in sealing engagement with the annular seal seat on the inner peripheral surface of the filler tube for sealing of the fuel vapor in the fuel tank, the first annular seal member engaging an upper portion of said annular seal member second seal member being disengaged from the annular seal seat so as to place the fuel tank in communication with the canister when the filler cap is partially loosened.