| 摘要 |
An exhaust gas purifier which can efficiently eliminate particulate matter discharged from an engine, and which has a long life. The purifier is attached to a discharge passage of an engine, and includes a filter constituted by a plurality of cylindrical filter elements each formed of porous metal. The filter elements are different in diameter from each other, and disposed concentrically and assembled radially apart from each other through a space. The filter has an exhaust gas inlet passage side end and an exhaust gas outlet passage side end, the exhaust gas inlet side end being closed, by a shielding plate, up to the cylindrical filter element of the largest outer diameter, and the exhaust gas outlet passage side end being closed at a portion between an outer circumferential case and the cylindrical filter element of the smallest outer diameter. The exhaust gas purifier further includes a plate-like heater disposed between the filter element of the largest outer diameter and the filter element disposed inside and adjacent to the filter element of the largest outer diameter without contacting with the two filter elements. Preferably, three-dimensional mesh porous metal having the same average pore-size is used as a material for each of the cylindrical filter elements.
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