Exhaust gas depurator having a catalytic activity, and silencer, for internal combustion engines

Abstract

An exhaust gas depurator having a catalytic activity, for internal combusn engines, further acting as discharge silencer, which comprises in combination two elements having a catalytic activity, and a substantially non-dissipative noise silencer interposed between the two catalytic elements. Each element having a catalytic activity is formed by a strip of metal sheet covered by a catalytically active material and wound to a spiral, and each strip has a number of drawn projections, inclined with respect to the longitudinal and the transverse directions of the strip, which act as spacers among the winding coils of the strip and act as baffles for the exhaust gas flow. Some openings are provided for in the strips. The non-dissipative silencer element is formed by a number of annular disks wherein tapered chambers are drawn, and the disks are coupled two by two and then the couples of disks are superimposed.

Dependencies are inferred from the claim text.