Small -size combined material integral fuel tank filler cap

The utility model provides a small -size combined material integral fuel tank filler cap, wherein, be provided with on mouthful frame be used for with the outer circumference of flap apron on the thread groove of the external screw thread interlock that sets up, mouthful frame is through splicing in advance on embedded income is provided with combined material foam sandwich structure's oil tank skeleton, be provided with the screw hole that is arranged in twisting the screw go into the packing ring on the flap apron, simultaneously the surface of flap apron have be used for through the instrument open with the little blind hole of closed flap apron, through putting into the instrument the rotatory flap apron of little blind hole in order to realize the opening of flap apron, closure, sealring imbeds to the packing ring in, and the packing ring is installed in the mouth frame, through the inseparable double sealing form of laminating of the metallic structure packing ring that adopts flap apron and mouthful fr