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AssigneeYutaka Giken Co., Ltd.
InventorsToru Hisanaga, Hiroshi Shinmura, Kazuhiro Furuhashi, Yasuyuki Sakurai
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A double exhaust pipe for an engine includes an inner pipe shell, and an outer pipe shell in which the inner pipe shell is accommodated. The inner pipe shell is secured at one end thereof to the outer pipe shell and slidably fitted at the other end thereof to an inner peripheral surface of the outer pipe shell. A heat-insulating space is provided between the inner and outer pipe shells to extend from the one end to the other end of the inner pipe shell. In this double exhaust pipe, the inner pipe shell has a bulged portion formed at the other end thereof. The bulged portion has a spherical outer surface slidably and oscillatably fitted to an inner peripheral surface of the outer pipe shell. Thus, even if the free end of the inner pipe shell is inclined upon thermal elongation of the inner pipe shell, the bulged portion at the free end can always be smoothly slipped on the inner peripheral surface of the outer pipe shell.
A double exhaust pipe for an engine, comprising an inner pipe shell, an outer pipe shell in which said inner pipe shell is accommodated, said inner pipe shell being secured at one end thereof to said outer pipe shell and slidably fitted at the other end thereof to an inner peripheral surf ace of said outer pipe shell, and a heat-insulating space provided between said inner and outer pipe shells to extend from said one end to the other end of said inner pipe shell, wherein said inner pipe shell has a bulged portion formed at the other end thereof, said bulged portion having a spherical outer surface slidably and oscillatably fitted to an inner peripheral surface of said outer pipe shell.
Dependencies are inferred from the claim text.