| 摘要 |
PURPOSE: A negative pressure regulating device in a fuel tank for a vehicle is provided to prevent damage from crack by restricting negative pressure of the fuel tank with shutting off an exhaust port through a conical safety valve in blocking the pipe of a canister. CONSTITUTION: An evaporation gas pipe is connected between a canister and a fuel tank, and a safety valve is installed in the evaporation gas pipe to restrict formation of negative pressure in the fuel tank in case of applying negative pressure over the reference value to the fuel tank. The safety valve is composed of a conical hollow valve housing forming an intake port in the fuel tank and an exhaust port in the canister, a rib(50) protruded in the inner periphery to form the communication passage, and a conical valve(54) elastically supported by an elastic member(52) in the valve housing to shut off the exhaust port against elastic force over the reference negative pressure.
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