| 摘要 |
<p>PURPOSE:To equalize an adhering quantity of fine particles in exhaust gas to partitions, by gradually increasing a thickness of the partition from an introducing side end part of the exhaust gas toward its outflowing side end part. CONSTITUTION:Since a filter 20 forms a thickness of its partitions 21 to be gradually increased from the upstream side of the partiton toward its downstream side, length of a passage formed by a space between ceramic frameworks is decreased in the upstream side of the partition, causing flow path resistance of exhaust gas to decrease and its flow quantity to increase. In consequence, a quantity of carbon fine particles adhering to the framework is also increased because a colliding quantity of the exhaust gas increases. On the contrary, the length of the passage formed by the space between the frameworks is increased in the downstream side of the partition 21 due to its large thickness, suppressing a flow of the gas due to an increase of flow path resistance. Accordingly, an adhering quantity of the carbon fine particles to the framework is decreased.</p> |
