| 摘要 |
The invention relates to a method of manufacturing parts for an exhaust pipe-silencer combination. According the method, the parts are formed of a metal strip by a helical seaming process. Outer tubes (1,3,4) of the silencer, which include a conical portion, are helically seamed beginning from a cylindrical portion having a larger diameter. The substantially conical portion is helically seamed so that the diameter thereof is diminished continuously and smoothly to correspond to the diameter of the parts of the exhaust pipe. Finally, a second cylindrical portion having a smaller diameter is formed. The invention is also related to an exhaust pipe-silencer combination, in particular for motor vehicles, in which both the exhaust pipe and an outer tube (2) of the silencer, as well as, of the outer tubes of the exhaust pipe and the silencer, outer tubes (1,3,4) most suitably conically changing in diameter, are of profiled, lock-fold jointed, helically-seamed tubing. The outer mantle of the silencer is partly formed by two separate parts (1,3) having substantially conical narrowing portions. The tube parts provided with the narrowing portions are connected to each other by the helically-seamed tube (2) having the diameter of the mantle of the silencer, utilizing the screw-threads of the profiling of the different parts. <IMAGE>
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