초록 ▼

A fill neck assembly of a vehicle fuel tank fill pipe incorporates in a single housing valving arrangements employed in an on board refueling vapor recovery system which prevents fuel vapor displaced from the fuel tank during a refueling operation from being discharged into the atmosphere. A fuel pa

A fill neck assembly of a vehicle fuel tank fill pipe incorporates in a single housing valving arrangements employed in an on board refueling vapor recovery system which prevents fuel vapor displaced from the fuel tank during a refueling operation from being discharged into the atmosphere. A fuel passage through the housing and connected to the fill pipe incorporates a nozzle seal near its inlet which will sealingly receive a standard fuel dispensing nozzle to enable fuel to be discharged from the nozzle into the fuel passage while preventing fuel vapor from being discharged from the fuel passage into the atmosphere. Vapor displaced from the tank by the incoming fuel passes from the tank through an outer hose loosely surrounding the fill pipe into a second passage through the housing having a vapor-liquid discriminator, a float valve and a vapor valve whose outlet is connected to a vapor receiving canister. In one embodiment, the vapor valve is opened in response to the insertion of the fuel dispensing nozzle into the nozzle seal, in a second embodiment the vapor valve is opened when the pressure of fuel vapor exceeds a set pressure. Emergency pressure relief valves are also incorporated in the housing.

대표청구항 ▼

In an on board refueling vapor recovery system for preventing fuel vapor displaced from the head space of a vehicle fuel tank during a refueling operation from being discharged into the atmosphere, said system comprising fill pipe means for conducting fuel dispensed from a standard tubular fuel disp

In an on board refueling vapor recovery system for preventing fuel vapor displaced from the head space of a vehicle fuel tank during a refueling operation from being discharged into the atmosphere, said system comprising fill pipe means for conducting fuel dispensed from a standard tubular fuel dispensing nozzle into said tank, a fuel vapor canister mounted on said vehicle for receiving fuel vapor, and fuel vapor passage means for conducting fuel vapor displaced from the head space of said tank by incoming fuel from the head space of said tank into said canister; the improvement wherein said fill pipe means comprises a fill neck housing having a fuel passage extending therethrough from an inlet to an outlet, annular seal means adjacent the inlet of said fuel passage for slidingly sealingly receiving a standard fuel dispensing nozzle inserted into said inlet to seal said fuel passage from atmosphere while accommodating the flow of fuel from said nozzle into said fuel passage via said inlet, and fill pipe means sealed to said housing for conducting fuel from said fuel passage into said tank, and said vapor passage means comprises an outer conduit sealed at its upper end to said housing and sealed at its lower end to said tank and opening into the head space of said tank, said outer conduit loosely surrounding said fill pipe means to define a vapor passage from said tank to said housing at the exterior of said fill pipe means, means defining a second passage extending through said housing from a vapor inlet opening into said vapor passage to a vapor outlet communicating with said canister, and float valve means in said second passage operable to accommodate the flow of vapor through said second passage and to prevent the flow of fuel from said vapor inlet to said vapor outlet, said improvement further comprising normally closed vapor valve means operable when closed to block the flow of vapor in said second passage between said float valve means and said vapor outlet and movable to an open position in response to the commencement of a refueling operation.