AN EXHAUST GAS PURIFICATION DEVICE

摘要

There is provided an exhaust gas purification device ( 22 ) comprising a substrate used for purifying components contained in an exhaust gas discharged from an engine. The substrate has partitions ( 54 ) which define passages ( 50,51 ) and are formed of porous material having fine pores each having a predetermined average size. The end portions of the adjacent partitions ( 54 ) defining each of part of the passages ( 50,51 ) of the substrate are partially connected to each other such that the end portions ( 52,53 ) are tapered toward the outside of the substrate. The tapered end portions partially close the end opening of the corresponding passage and form a small hole ( 55,56 ) defined by the tips thereof. The size of each small hole ( 55,56 ) is smaller than the cross sectional area of the corresponding passage ( 50 ) and larger than the sizes of the fine pores of the partitions ( 54 ).