초록 ▼

There are provided firstly a fuel cap which irrespective of its type has a structure that there is no transpiration of gasoline vapor until the cap is fully open and secondly particularly a bayonet-type fuel cap which has a structure that there is no eruption of fuel under a pressure difference betw

There are provided firstly a fuel cap which irrespective of its type has a structure that there is no transpiration of gasoline vapor until the cap is fully open and secondly particularly a bayonet-type fuel cap which has a structure that there is no eruption of fuel under a pressure difference between a internal pressure of the tank and atmospheric pressure. In each case the fuel cap consists of a closure 3 fitting into the opening of a filler neck 4 and a handle 2 integral with the closure 3 , and an upper seal ring 10 and a lower seal ring 1 for sealing the filler neck 4 are each fitted individually to the closure 3 positionally apart from the other.

대표청구항 ▼

1. A fuel cap for automobiles, which is a screw-type fuel cap, comprising:a closure mounting an upper seal ring and a lower seal ring individually thereon, anda handle integrally constructed with the closure, whereinthe upper seal ring is mounted on the closure at the position to be unsealed with a

1. A fuel cap for automobiles, which is a screw-type fuel cap, comprising:a closure mounting an upper seal ring and a lower seal ring individually thereon, anda handle integrally constructed with the closure, whereinthe upper seal ring is mounted on the closure at the position to be unsealed with a filler neck when the closure starts to be turned off,the lower seal ring is mounted on the closure at the position to release a sealing condition of the filler neck when the closure is completely removed from the filler neck, and the lower seal ring has a cross-section comprising:a ring base attached to the closure;an umbrella-shaped part extending with the ring base in a direction to an inner wall of the filler neck with downward pitch;an elastic support part provided at the edge of the umbrella-shaped part contacting in pressure against the inner wall of the filler neck; anda lip part extending from the elastic support part in a direction to the closure with downward pitch.