초록 ▼

A vaportight seal door assembly mounted in the upper end of a vehicle fuel system filler pipe. The seal door is normally biased to a closed position to create a vaportight seal between the fuel tank and the filler pipe inlet, normally closed by a cap. The seal door yields upon insertion of a dispens

A vaportight seal door assembly mounted in the upper end of a vehicle fuel system filler pipe. The seal door is normally biased to a closed position to create a vaportight seal between the fuel tank and the filler pipe inlet, normally closed by a cap. The seal door yields upon insertion of a dispenser nozzle to permit refueling. The seal door is provided with pressure relief structure to vent fuel vapor from the fuel tank to the upper end of the filler pipe at a predetermined pressure differential when the seal door is closed.

대표청구항 ▼

In a vehicle fuel system having a fuel tank and a filler pipe with an inlet, an improved seal door assembly in the filler pipe between the inlet and the fuel tank, comprising: partition means in the filler pipe near the filler pipe inlet, the partition means including an aperture sized to permit ins

In a vehicle fuel system having a fuel tank and a filler pipe with an inlet, an improved seal door assembly in the filler pipe between the inlet and the fuel tank, comprising: partition means in the filler pipe near the filler pipe inlet, the partition means including an aperture sized to permit insertion of a fuel dispenser nozzle through the partition means, the partition means further defining a seal door seat associated with the aperture; a seal door movable from a closed position on the seat to an open position off the seat upon insertion of a dispenser nozzle through the aperture, the seal door biased by spring means to the closed position; external seal means associated with the seal door and the seat, the external seal means forming a vaportight seal between the seal door and the seat in the seal door closed position; wherein the seal door comprises a hollow body having an upper portion with a dispenser nozzle contact surface, a lower portion having a axial vent opening in vapor communication with the fuel tank, radial vent ports formed in the upper portion communicating the interior of the hollow seal door body to the upper end of the filler pipe, an internal valve seat between the axial vent opening and the radial vent ports, and internal pressure relief valve means axially movable on and off the valve seat, the valve means normally biased to a closed position on the valve seat.