| 摘要 |
<p>An emission system part, comprising an inner pipe in which a space is formed continuously up to the tapered reduced diameter parts of inner and outer pipes and which incorporates a catalyst carrier at its center part and forms a generally tapered reduced diameter part of its center part at both end parts so as to produce it easily and at a low cost and an outer pipe in which a generally tapered reduced diameter part is formed integrally at both end parts of its center part corresponding to the center part of the inner pipe and which has a space in all areas including the reduced diameter part at both end parts and the center part and is fitted over the inner pipe, wherein the reduced diameter part at both end parts of the outer pipe is formed by a spinning working. A method of manufacturing the emission system part, comprising the steps of installing the outer pipe on the outside of the inner pipe which incorporates a catalyst carrier at its center part and forms the generally tapered reduced diameter part of its center part at both end parts while a space is maintained, and reducing the diameter of the outer pipe generally in a tapered-shape at both end parts by applying the spinning working to these parts so that a space is provided between the outer pipe and the reduced diameter part of the inner pipe.</p> |
