Patent ID: 8851231

Claim:
An exhaust noise control apparatus for an engine, comprising a housing having a first end wall and a second end wall spaced apart with a cover attached; a first baffle disposed in said housing spaced apart from said first end wall to form a first interior chamber, and a second baffle disposed in said housing intermediate and spaced apart from said first baffle and said second end wall to form an intermediate chamber and a third chamber; an intake tube inserted through an intake port in said first end wall to extend through a first baffle intake port and through a second baffle exhaust port to terminate at an exit end in said third chamber; an exhaust tube with an exhaust output inserted through an exhaust port in said second end wall to extend through a second baffle exit port and a first baffle exit port to terminate at an inlet end in said first chamber; said intake tube and said exhaust tube each having apertures therein disposed in a tube wall portion positioned in said intermediate chamber, and said exhaust tube having exhaust apertures formed in a second tube wall portion positioned in said third chamber; an intermediate port formed in said first baffle; a threaded sleeve fitting inserted through and attached to said second end wall to be disposed opposite said exit end of said intake tube; and a threaded shaft of a valve threadably engaged in said sleeve fitting to position a valve body adjacent to said exit end of said intake tube wherein said valve body is shaped to restrict gas flow out of said exit end.