초록 ▼

The present invention is directed to muffler apparatus and a method for making same. The apparatus includes inlet and outlet tubes with a plurality of baffles extending from the inlet and outlet tubes to a housing. The outlet tube has a constricted portion near its inlet end formed with creases and

The present invention is directed to muffler apparatus and a method for making same. The apparatus includes inlet and outlet tubes with a plurality of baffles extending from the inlet and outlet tubes to a housing. The outlet tube has a constricted portion near its inlet end formed with creases and lobes and a flare 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.

대표청구항 ▼

A muffler, comprising: a housing having an endlessly curving wall, said housing also having opposite end baffles and first and second intermediate baffles attached to said wall, said wall and said intermediate baffles forming an expansion chamber; an inlet tube attached to one of said end baffles an

A muffler, comprising: a housing having an endlessly curving wall, said housing also having opposite end baffles and first and second intermediate baffles attached to said wall, said wall and said intermediate baffles forming an expansion chamber; an inlet tube attached to one of said end baffles and said first intermediate baffle, said inlet tube having inlet and outlet ends, said inlet tube including a closure at the outlet end and means upstream from the outlet end for communicating gaseous fluid to said expansion chamber; and an outlet tube attached to one of said end baffles and said second intermediate baffle, said outlet tube having inlet and outlet ends, said inlet end including shape means for increasing sound attenuation of gaseous fluids entering said outlet tube and reducing volume occupied by said outlet tube thereby increasing expansion chamber volume to further enhance sound attenuation within said expansion chamber, said shape means of said outlet tube including a plurality of connected, partial ovals proceeding from a circular cross-sectional shape near said outlet end along a constricted portion to a throat cross-sectional area which connects with a flared portion leading to the inlet end of said outlet tube.