Opening-closing device for fuel supply passage

An opening-closing device for a fuel supply passage that conducts fuel supplied from a fuel nozzle to a fuel tank, the opening-closing device being configured to selectively open and close the fuel supply passage and comprising:

• a tubular passage forming portion having a fuel inlet port;
• a flap that selectively opens and closes the fuel inlet port and includes an engagement portion;
• and
• an opening-closing actuating member, wherein
• when the fuel nozzle inserted into the passage forming portion is an intended-fuel nozzle, which has a nozzle diameter corresponding to fuel in the fuel tank, the opening-closing actuating member allows the flap to open the fuel inlet port,
• when the fuel nozzle is an unintended-fuel nozzle, which has a nozzle diameter smaller than that of the intended-fuel nozzle, the opening-closing actuating member does not allow the flap to open the fuel inlet port,
• the opening-closing actuating member includes
• a main body disposed along an inner wall surface of the passage forming portion, and
• a plurality of movable portions coupled to the main body,
• each movable portion includes a proximal portion, an arm, a nozzle detecting portion, and an engaging portion,
• the proximal portions of the movable portions protrude inward in a radial direction of the passage forming portion from different positions on the main body separated in a circumferential direction of the passage forming portion,
• each arm extends in the circumferential direction from the corresponding proximal portion while being separated inward in the radial direction from an inner wall surface of the main body,
• each nozzle detecting portion protrudes inward in the radial direction from. the corresponding arm,
• each engaging portion is provided at a position different from the nozzle detecting portion on the corresponding arm,
• when the nozzle detecting portions do not receive a pushing force acting outward in the radial direction from the intended-fuel nozzle, the engaging portions are engaged with the engagement portion to lock the flap in a closing state in which the flap closes the fuel inlet port, and
• when the nozzle detecting portions receive the pushing force, the arms are bent so that the engaging portions are disengaged outward in the radial direction from the engagement portion to unlock the flap.