| 摘要 |
An exhaust system for internal combustion engines, which, in order to improve the durability of an exhaust system for internal combustion engines having an exhaust gas purifying device welded to an exhaust pipe, comprises a first exhaust pipe (3) and an exhaust gas purifying device (4) having a casing (20). The casing (20) is composed of first and second casing halves (21, 22) joined together by welding. The upstream end (3a) of the first exhaust pipe (3) is connected to an exhaust manifold through a spherical joint (6), while the downstream end (3b) of the first exhaust pipe (3) is welded to a first casing half (21), of two casing halves (21, 22), which forms the upper portion of he casing (20), in such a manner that the downstream end (3b) does not overlap a weld (W2) which joins the two casing halves (21, 22). Therefore, there is no possibility of overlap of a weld (W1) between the first exhaust pipe (3) and the first casing half (21), nor is the possibility of strength being decreased. Further, exhaust gases flow into the casing (20) only through the first exhaust pipe (3).
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