FLEXIBLE TUBE

摘要

A flexible tube (10) provided at a downstream part of an exhaust passage of an engine (E) and constructed from an outer bellows (3) as an outer tube and an inner bellows (4) as an inner tube. A bellows (4c, 4c) of the inner bellows (4) has ridges of which height and pitch are less than those of a bellows (3c) of the outer bellows (3). A shock-absorbing space (S) where a gap (t) is formed is provided between valleys of the outer bellows (3) and ridges of the inner bellows (4). A partition (17) for partitioning an exhaust passage is provided in the inner bellows (4). The structure above enhances sound-shielding effect and limits the lowering of temperature of an exhaust gas, hastening the rise of temperature of the exhaust gas flowing into a catalytic converter to activate a catalyst. Exhaust gas-purifying characteristics are improved and gas-exhausting efficiency is improved, so that output characteristics of an engine can be improved.