| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalytic converter preventing or avoiding various problems caused by heat transfer from exhaust gas flowing a bypass passage penetrating through the center of the catalytic converter to a honeycomb body. <P>SOLUTION: The catalytic converter is provided with the catalyst-carrying honeycomb body 10 contained in a cylindrical casing 20, and the bypass passage B penetrating through the center of the honeycomb body 10. A double inner tube composed of a first inner tube 21 and a second inner tube 22 is provided in a periphery region of the bypass passage B and honeycomb body 10 surrounding it. Between the first and second inner tubes 21, 22, a hollow heat insulating layer 25 is secured preventing intrusion of exhaust gas from the upstream side, by fixing the upstream end of the first inner tube 21 to an upstream contact part 23a of a reduced part 23 of the second inner tube 22 at an upstream end of the double inner tube. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
