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Integral unitary manifold-muffler-catalyst device

  • US 5,220,789 A
  • Filed: 03/05/1991
  • Issued: 06/22/1993
  • Est. Priority Date: 03/05/1991
  • Status: Expired due to Term
First Claim
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1. An integral manifold-muffler-catalyst device for an internal combustion engine having a plurality of combustion cylinders generating exhaust gases, comprising:

  • (a) a monolithic catalyst having a plurality of aligned passages for effecting laminar flow of said exhaust gases therethrough;

    (b) a high temperature resistant chamber assembly for close-coupling said catalyst to said engine having (i) an expansion chamber for substantially dissipating low frequency sound waves of said exhaust gases and for modifying high frequency sound waves of said exhaust gases and (ii) manifolding passages at one side of said expansion chamber for collecting and delivering the exhaust gases from said cylinders to the expansion chamber; and

    (c) means for effecting converging flow from said expansion chamber to and substantially the full entrance face of said aligned passages and for effecting converging flow from said catalyst, said dual-stage convergence reflecting and attenuating high frequency sound waves carried by said exhaust gases by interference.

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