Patent ID: 8814174

Claim:
A rubber gasket of annular shape adapted to be interposed between two objective members to be sealed and fastened to each other, wherein: one of said two objective members to be sealed has a step-shaped portion of which inside is opened by a step-floor portion and an inner circumferential wall portion perpendicular to said step-floor portion, whereas the other member of said two objective members has a flat-shaped portion parallel to said step-floor portion; said rubber gasket comprises an integrally molded body made of elastomer having a cylindrical body, a flange-shaped portion, and an annular core member, said cylindrical body having no said annular core member therein and being interposed in said step-shaped portion and being made solely of elastomer, said flange-shaped portion extending outward from one end of said cylindrical body in axial direction along an entire outer circumferential surface, said annular core member being embedded in said flange-shaped portion along an entire circumference; and said rubber gasket is constructed such that when said two objective members to be sealed are fastened with said rubber gasket interposed therebetween, both ends of said cylindrical body in axial direction thereof are positioned respectively at seal line portions of said two objective members to be sealed, said cylindrical body is compressed by fastening force along fastening direction, and said flange-shaped portion is positioned outside said seal line portion in diametrical direction and is interposed in a gap formed between said two objective members to be sealed.