Muffler apparatus.

摘要

The apparatus includes inlet and outlet tubes (24,20) with a plurality of baffles (28) extending from the inlet and outlet tubes to a housing (26). The outlet tubes (20) has a constricted portion (30) near its inlet end formed with creases (32,34) and lobes (52,54) and a flare (36) at the end. Such constriction increases the housing to outlet tube area ratio of the muffler which results in advantageous attenuation characteristics. The process for making the muffler is simpler than known methods since the outlet tube is formed and baffles pressed onto it in a single step.