Patent ID: 7886759
Filing Date: 2011-02-15
Classification: B60K,F16K,Y10T

Abstract:
1. A fuel cutoff valve that is mounted on an upper wall of a fuel tank, and opens and closes a connection conduit to connect the fuel tank and outside, the fuel cutoff valve comprising: a casing forming a valve chamber for connecting the fuel tank interior with the connection conduit; and a float mechanism having (i) a float that is housed within the valve chamber and that rises and falls according to a fuel level within the valve chamber, and (ii) a seat portion disposed on an upper portion of the float, for opening and closing the connection conduit; wherein the float includes (i) a horizontally formed upper wall portion furnished with the seat portion, (ii) a side wall portion extending downwardly from a periphery of the upper wall portion, (iii) a float chamber that is formed with the upper wall portion and the side wall portion, and opens at a bottom of the float, (iv) an upper vent hole formed in the upper wall portion of the float for connecting the float chamber with the valve chamber and located at a side of the seat portion, and (v) a side communicating hole formed in the side wall portion below the upper vent hole for connecting the float chamber with the valve chamber, wherein the upper vent hole passes through the upper wall portion in a vertical direction, wherein the upper vent hole is formed to have greater air flow resistance than the side communicating hole and communicates the float chamber with the valve chamber even when the seat portion closes the connection conduit, and the float chamber is configured to be filled with fuel until a position of the upper wall portion.