| 摘要 |
PROBLEM TO BE SOLVED: To prevent the intrusion of exhaust gas in large quantities into a mat, and to prevent the generation of a turbulence in a flow of the exhaust gas in the vicinity of the mat, in an exhaust muffler device having a ceramic catalyst body therein.SOLUTION: An exhaust muffler device of an engine includes a catalyst body 80 therein, a diametrically-contractive part 84A is formed by diametrically contracting a holding cylinder 82 for holding the catalyst body 80 inside at an end 84 via a holding mat 81, a downstream tapered pipe 74 of an exhaust pipe upstream part 61A connected to the holding cylinder 82 is fitted to the inner periphery of the diametrically-contractive part 84A of the holding cylinder 82, and the end 84 of the holding cylinder 82 is welded and fixed to the downstream tapered pipe 74 of the exhaust pipe upstream part 61A so that an inner peripheral surface 79 of the downstream tapered pipe 74 of the exhaust pipe upstream part 61A approaches a boundary 86 between the holding mat 81 and the catalyst body 80. |
