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A fuel evaporative-gas emission preventing apparatus capable of reducing the quantity of adsorption of a canister as low as possible by a single breather at any fueling speeds and allowing emissions to fall within given limits. One end of the breather is coupled to a portion near a port of an inlet

A fuel evaporative-gas emission preventing apparatus capable of reducing the quantity of adsorption of a canister as low as possible by a single breather at any fueling speeds and allowing emissions to fall within given limits. One end of the breather is coupled to a portion near a port of an inlet pipe for a fuel tank and a differential pressure regulating valve is connected to the other end of the breather. The canister is coupled to the differential pressure regulating valve. An opening-area variable device is provided at an intermediate portion of the breather and adjusts the quantity of a fuel evaporative-gas in the breather according to an internal pressure of the fuel tank.

대표청구항 ▼

A fuel evaporative-gas emission preventing apparatus comprising: a fuel tank; a breather for coupling the inside of said fuel tank and a neighborhood of a fuel-supply port of said fuel tank to each other; a canister for adsorbing a fuel evaporative-gas generated within said fuel tank; a vapor line f

A fuel evaporative-gas emission preventing apparatus comprising: a fuel tank; a breather for coupling the inside of said fuel tank and a neighborhood of a fuel-supply port of said fuel tank to each other; a canister for adsorbing a fuel evaporative-gas generated within said fuel tank; a vapor line for coupling said fuel tank and said canister to each other; and vapor line ventilation resistance varying means for varying a ventilation resistance of said vapor line so that a quantity of a fuel evaporative-gas in said breather is substantially identical to a quantity of intake of air into said fuel tank by fueling.