Patent ID: 8220506

Claim:
A structure for a fuel filling section of a fuel tank, comprising: a fuel filling port member comprising a fuel filling port in which a fuel filling gun, for filling fuel into a fuel tank, is inserted; an opening/closing valve that is provided at the fuel filling port member and closes the fuel filling port, and that opens the fuel filling port when pushed by the fuel filling gun; a positive pressure valve comprising a positive pressure valve main body that is movable between a positive pressure valve open position at which the positive pressure valve main body opens the fuel filling port and a positive pressure valve closed position at which the positive pressure valve main body closes the fuel filling port further toward a fuel tank side than the positive pressure valve open position, a first spring for the positive pressure valve that urges the positive pressure valve main body toward the positive pressure valve closed position, and a positive pressure valve supporting member that supports and maintains, at the positive pressure valve closed position, the positive pressure valve main body that is urged by the first spring, and, in a closed state of the opening/closing valve, when a tank internal pressure of the fuel tank is greater than a tank external pressure, the positive pressure valve opens the fuel filling port due to the positive pressure valve main body moving to the positive pressure valve open position against an urging force of the first spring; and a negative pressure valve comprising a negative pressure valve main body that is provided further toward the fuel tank side than the positive pressure valve main body and that is movable between a negative pressure valve open position at which the negative pressure valve main body opens the fuel filling port and a negative pressure valve closed position at which the negative pressure valve main body closes the fuel filling port by contacting the positive pressure valve main body, and a second spring for the negative pressure valve that urges the negative pressure valve main body toward the negative pressure valve closed position, the urging force of the second spring being set to be smaller than an urging force of the first spring, and, in the closed state of the opening/closing valve, when the tank internal pressure of the fuel tank is smaller than the tank external pressure, the negative pressure valve opens the fuel filling port due to the negative pressure valve main body moving to the negative pressure valve open position against the urging force of the second spring, wherein the opening/closing valve is provided at the negative pressure valve main body, and wherein a flow path for positive and negative pressure relief does not pass through the opening/closing valve.