| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric heating type catalyst device with an intermediate cylinder to effectively buffer thermal expansion between an outer cylinder and a honeycomb body, in a honeycomb body for an electric heating type catalyst short in an overall length. SOLUTION: In an electric heating type catalyst device wherein a cylindrical honeycomb body 7 around which an overlapped body of a corrugated foil 4 and a flat foil 5 are wound is contained in a metallic outer cylinder 11 through an intermediate cylinder 40 and the honeycomb body 7 is energized for heating, the intermediate cylinder 40 forms a double cylinder consisting of outside and inside cylinders 41 and 42. After a long heat resistant metallic sheet 44 is folded in a U-shape along a longitudinal direction, the metallic sheet is molded in a cylindrical state. In the metallic sheet 44 before folding, cuts are alternately formed from two end parts in the direction of width to form slits 45 at intervals of a given distance. When the metallic sheet 44 is folded, the slit 45 and a metallic piece 46 formed by forming the slits 45 are positioned facing each other. The outside cylinder 41 is joined with the metallic outer cylinder 11 and the inside cylinder 42 is joined with the honeycomb body 7. |
