| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress occurrence of peristaltic operation caused by heat expansion and heat contraction in an axial direction of a wave plate so as to prevent the damage of a particulate trap by chamfering the axial direction end part of the wave plate in the vicinity of an outer peripheral part of the particulate trap. SOLUTION: Four square parts of inner and outer sides of an exhaust upstream side and a downstream side end surface of wave plates 2a', 2b' in the vicinity of the outer peripheral part of a particulate trap, are chamfered. Generally, a peristaltic operation which is relatively to a nonwoven fabric of a wave plate is generated by biting and restricting square parts of an exhaust upstream side and a downstream side end surface of the wave plate into an nonwoven fabric of outer and inner sides, at the time of heat expansion and heat contraction in an axial direction of the wave plate and the nonwoven fabric. If four square parts are chamfered, the wave plates 2a', 2b' are bitten into the nonwoven 1a, 1b, and it is possible to prevent the damage of a particulate trap without carrying out peristaltic operation of the wave plates 2a', 2b' in the nonwoven 1a, 1b.</p> |
