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Lightweight muffler and method for muffling noise

  • US 4,220,219 A
  • Filed: 09/14/1978
  • Issued: 09/02/1980
  • Est. Priority Date: 09/14/1978
  • Status: Expired due to Term
First Claim
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1. A lightweight small diameter muffler for internal combustion engines or the like including an outer elongated imperforate casing, an inlet tube mounted to said casing and extending internally thereof for the flow of exhaust gases into said muffler, an outlet tube mounted to said casing and extending therefrom for the flow of said gases from said casing, a cup-like partition means mounted inside said casing for discharge of gases from said inlet tube into said cup-like partition means, said casing and said inlet tube defining an annular elongated expansion chamber in said casing proximate and in flow communication with said cup-like partition means for discharge of gases from said cup-like partiton means into said chamber, and passageway means from said chamber to said outlet tube, wherein the improvement in said muffler comprises:

  • said inlet tube being imperforate;

    said cup-like partition means and said inlet tube being formed to provide an annular nozzle for discharge of gases into said chamber in an annular first stream portion directed against and along the outside surface of said inlet tube;

    said casing being formed with an inside surface parallel to said outside surface of said inlet tube over substantially the entire length of said chamber, and said casing being formed with a flow reversal surface at an end of said chamber remote from said cup-like partition means, said flow reversal surface extending radially from a position proximate said inlet tube to a position proximate said inside surface of said casing wall and being formed for controlled flow of said gases in a stream from said annular first stream portion to an annular second stream portion moving along said inside surface of said casing in an opposite direction and concentric with said annular first stream portion, said chamber being further formed for concentric side-by-side flow in said chamber of said first annular stream portion and said second annular stream portion without partition means interposed in said chamber between the stream portions.

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