JP2729041B

PURPOSE: To generate a strong joint of a metal outer cylinder with a honeycomb member by arranging so that fin-shaped projections and the notch tips of an intermediate cylinder are parallel with the axis of the intermediate cylinder, joining the tips of the fin-shaped projections of the intermediate cylinder with the internal circumferential surface of the metal outer cylinder, and joining the internal circumferential surface of the intermediate cylinder with the outside surface of the honeycomb member. CONSTITUTION: An intermediate cylinder 3 is installed between a metal outer cylinder 2 and honeycomb member 1, and fin-shaped projections 4 are provided on the intermediate cylinder 3 in its circumferential arrangement or aslant thereto. The straight line tying the projections 4 to two notch tips of the intermediate cylinder 3 is approx. parallel with the axis of the intermediate cylinder 3, and the projections 4 are joined with the outer cylinder 2, and the internal circumferential surface of the cylinder 3 is joined with the honeycomb member 1. Even if a thermal strain is generated resulting from the difference in the thermal expansion at the time of service, it is shared and absorbed by the cylinder 3, in particular by the whole projections protruding in the circumferential direction or aslant. That is, if the two notch tips are parallel with the intermediate cylinder, the whole fins are bent relative to bending in the radial direction, so that the strain is dispersed in the whole fins to permit a service for a long period of time.