A filter device for reducing automobile exhaust fume, the filter device comprising:
- a case including an inlet port, a porous tube and an exhaust port, a combusted exhaust gas flowing into the porous tube having a pipe shape from an engine, the porous tube being formed with a plurality of vent holes through which the exhaust gas is discharged after passing through a metallic foam filter in such a way as to obtain a maximum flow area and simultaneously minimize vibration and deformation by an external force, the exhaust gas being discharged through the exhaust port after passing through the porous tube and a flow passageway;
- a front flange mounted inside the case, the front flange being vertically fixed to the metallic foam filter wrapping around the porous tube to hold the porous tube and prevent the metallic foam filter from being pushed towards the front end, the front flange being welded with the porous tube at the side of the inlet port such that the front flange and the porous tube at the side of the inlet port are in parallel to each other, thereby propagating the welding heat in the lengthwise of the porous tube at the side of the inlet port, the deformation due to heat transfer being limited to the direction vertical to the flange plane to thereby minimize thermal deformation of the flange plane;
- a rear flange mounted inside the case, the rear flange being vertically fixed to the rear end of the metallic foam filter wrapping around the porous tube to thereby hold the porous tube and prevent the metallic foam filter from being pushed toward the rear end, the rear flange being formed with small and large grooves protruding on the surface of the rear flange in order to easily position the position of the porous tube by the protruded grooves when fastened with the porous tube at the side of the inlet port, the rear flange being formed with a serrated groove in such a way as to reduce deformation due to a high temperature heat generated when the rear flange is welded to the porous tube at the side of the inlet port, thereby maintaining the evenness of the surface of the rear flange;
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- a filter member including a laminated-type or rolled-up type metallic foam filter mounted between the front and rear flanges, and a jacket wrapped around the metallic foam filter, the exhaust gas that flows inside the porous tube passing through the metallic foam filter, the jacket wrapping around the metallic foam filter being formed in a network form to maintain the shape of the metallic foam filter and provide durability thereto, the jacket being formed with a rectangular vent hole and wrapping around and holding the metallic foam filter such that the shape, construction and position of the metallic foam filter can be maintained against an expanding force of the foam filter while securing a flow area.