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US 4,625,777 AGranted
Fuel tank ventilating system
AssigneeGeneral Motors Corporation
InventorWilfried Schmidt
Life of this patent
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AssigneeGeneral Motors Corporation
InventorWilfried Schmidt
Estimating the term…
An arrangement for limiting the filling of tanks and for aeration and ventilation of tanks in which a portion of the tank volume acts as a pressure-compensation space for temperature changes, has an aeration and ventilation arrangement opening into the aeratable and ventable filler neck, said arrangement having a filling vent which determines the maximum allowable liquid level and an operating vent to take over aeration and ventilation of the pressure-compensation space with a sealing arrangement, such that the operating vent is sealed off by the action of a spring when the tank cap is removed, and when the tank cap is attached, it is thereby opened against the spring pressure. Operating ventilation is controlled by a valve integrated into the aeration and ventilation line which valve can be actuated against spring resistance by a plunger rod. The valve is placed in the filler neck in such a way that the plunger rod runs parallel or substantially parallel to the side of the filler neck within the same filler neck, and its free end projects from the filler neck when the tank cap is removed.
Arrangement for limiting the filling of tanks and for aeration and ventilation of fuel tanks in which a portion of the tank volume acts as a pressure-compensation space with regard to temperature changes, with an aeration and ventilation arrangement opening into an aeratable and ventable filler neck, said arrangement having a filling vent which determines the maximum liquid level considered allowable and an operating vent which takes over aeration and ventilation of the pressure-compensation volume with a sealing system, such that the operating vent is sealed by means of a spring when the tank cap is removed, and opened when the tank cap is put on by action of the same against the spring force, characterized by the fact that a valve integrated into the aeration and ventilation line controls the operating vent, the valve body of said valve being operable against spring resistance by means of a plunger rod, and that the valve is placed in the filler neck in such a way that the piston rod is parallel to the sides of the filler neck, and that its free end projects out of the filler neck when the tank cap is removed.
Apparatus for limiting the filling of fuel tanks and for aeration and ventilation of tanks in motor vehicles, wherein a portion of the tank volume acts as an accumulator space with aeration and ventilation passages opening into a filler neck on the fuel tank which is closable with a fuel cap, said passages including a filling vent passage which determines the maximum which determines the maximum liquid level desired at filling and operating vent passage means which accommodate aeration and ventilation of the accumulator, said apparatus including a sealing system, such that the operating vent is sealed when the cap is removed, and opened when the cap is installed, said sealing system comprising valve means integrated into the aeration and ventilation line for controlling the operating vent and including spring means, a valve element operated on by said spring means, a plunger rod secured to said valve, said valve means being disposed in the filler neck in such a way that the plunger rod is parallel or substantially parallel to the sides of the filler neck, and that a free end thereof projects out of the filler neck when the tank cap is removed to permit closing of said valve means.
Dependencies are inferred from the claim text.