HOLDING STRUCTURE FOR MONOLITHIC CATALYST

PURPOSE:To reduce the number of parts and to simply contain a monolithic catalyst in a catalyzer container by forming a projection and/or recess on the inner peripheral wall of an inner case having a tapered surface corresponding to the lower oblique surface of the container. CONSTITUTION:An exhaust gas purifier is constructed to contain an inner case 12 and a monolith catalyzer 11 disposed in the inner case in a catalyst container 13 which is clamped with a bolt 16 and a nut 17 at the downstream side of an exhaust gas manifold 15. In this case, the cylindrical inner case 12 which contains the catalyzer 11 formed and baked in advance in the prescribed shape is formed with a flange 12a at one end of the upstream side, is mounted on the container 13, and is formed with a tapered surface 12b along the oblique surface of the container 13 at the downstream side end. A projection 12c and a recess groove 12d are formed on the inner peripheral wall of the case 12, thereby forming a structure for preventing the catalyzer 11 from moving elevationally in the case 12.