초록 ▼

An apparatus is provided for controlling discharge of fuel vapor from the fuel tank having a filler neck during refueling. The apparatus includes a passage for conducting fuel vapor between the fuel tank and a distal portion of the filler neck and a valve for selectively blocking flow of fuel vapor

An apparatus is provided for controlling discharge of fuel vapor from the fuel tank having a filler neck during refueling. The apparatus includes a passage for conducting fuel vapor between the fuel tank and a distal portion of the filler neck and a valve for selectively blocking flow of fuel vapor through the conducting means. The valve is operable between a flow-blocking position and a flow-delivery position. A spring yieldably biases the blocking means away from its flow-blocking position to a flow-delivery position. An assembly defining a venting control chamber in communication with the valve is provided for using liquid fuel in the fuel tank to develop a pressure head in the venting control chamber having a magnitude in excess of a predetermined threshold level to exert a closing force on the valve in opposition to the spring so that the valve is moved to its flow-blocking position, thereby preventing discharge of pressurized fuel vapor in the tank to the filler neck through the passage.

대표청구항 ▼

An apparatus for controlling discharge of fuel vapor from a fuel tank having a filler neck during refueling, the apparatus comprising means for conducting fuel vapor between the fuel tank and a distal portion of the filler neck, means for selectively blocking flow of fuel vapor through the conductin

An apparatus for controlling discharge of fuel vapor from a fuel tank having a filler neck during refueling, the apparatus comprising means for conducting fuel vapor between the fuel tank and a distal portion of the filler neck, means for selectively blocking flow of fuel vapor through the conducting means, the blocking means being operable between a flow-blocking position and a flow-delivery position, means for yieldably biasing the blocking means away from its flow-blocking position to a flow-delivery position, and means defining a venting control chamber in communication with the blocking means for using liquid fuel in the fuel tank to develop a pressure head in the venting control chamber having a magnitude in excess of a predetermined threshold level to exert a closing force on the blocking means in opposition to the biasing means so that the blocking means is moved to its flow-blocking position, thereby preventing discharge of pressurized fuel vapor in the tank to the filler neck through the conducting means.