Patent ID: 8439159
Filing Date: 2013-05-14
Classification: F01N

Abstract:
1. A muffler for use with an internal combustion engine comprising: an outer casing having a hollow interior and first and second end portions disposed respectively at opposite longitudinal ends of said casing, end caps mounted one at each of said end portions of said outer casing, frustoconically shaped entrance and exit collar located one at each of said opposite end portions of said outer casing, entrance and exit ducts connected to and communicating respectively with said entrance and exit collars and protruding from an associated one of said opposite ends of said casing via an associated one of said end caps, respectively, a nested tube assembly composed of at least three open ended tubes in direct supporting lateral engagement with mutually adjacent ones of said tubes and extending longitudinally between said entrance and exit collars in laterally spaced relation to said casing and each having first and second open end portions disposed respectively at opposite longitudinal ends thereof, wherein at least one of said tubes is perforated and at least one of said tubes is non-perforated, said entrance and exit collars being crimped at their largest ends respectively in surrounding relation to an array of said first and second end portions of said tubes of said tube assembly, and sound absorbing material disposed in the interior of said casing in the space defined between said tube assembly and said outer casing.