| 摘要 |
PCT No. PCT/SE87/00107 Sec. 371 Date Aug. 30, 1988 Sec. 102(e) Date Aug. 30, 1988 PCT Filed Mar. 4, 1987 PCT Pub. No. WO87/05357 PCT Pub. Date Sep. 11, 1987.Exhaust system for combustion engines, which comprises of a longtiudinally extending tubular member (1), in direction from a first end portion having a number of smooth portions (2, 2') alternating arranged with corrugated portions (3, 3'). At least one insert is arranged insertable into the longitudinally extending tubular member (1), held in inserted position substantially only by means of frictional contact between inserted insert and surrounding tubular member (1). The insert is arranged to cause exhaust fumes flowing through the tubular member (1) from the combustion engine to receive a changed chemical composition by means of catalytic action and/or to reduce the exhaust sound level by a change in the flow characteristics for the exhaust fumes. The corrugated portions (3, 3') are advantageously arranged including a non-corrugated portion, forming a smooth and non-corrugated surface extending in longitudinal direction of the tubular member, which is located as a lower surface when the exhaust system is installed. |
