| 摘要 |
<p>Three exhaust pipe units (20, 40, 60) are arranged in a row in a back pressure regulator (15) of an exhaust device. In each of the exhaust pipe units (20, 40, 60), the base end of inner exhaust pipe (22, ...) is inserted into an outer exhaust pipe (21, ...) and tubular gaps (23, 43, 63) are formed therebetween. Furthermore, openings (24, 44, 64) as through holes are formed in the outer exhaust pipes (21, ...). Each of the circular pipe portions (31, 51, 71) of spacer members (30, 50, 70) has an inside diameter equal to the outside diameter of the inner exhaust pipe (22, ...), and an outside diameter equal to the inside diameter of the outer exhaust pipe (21, ...). When the circular pipe portions (31, ...) are inserted between the outer exhaust pipes (21, ...) and the inner exhaust pipes (22, ...), central axes of the outer exhaust pipes (21, ...) and the inner exhaust pipes (22, ...) are aligned and the thickness of each of the tubular gaps (23, 43, 63) becomes uniform over the entire circumference of the outer exhaust pipe (21, ...).</p> |
