Patent ID: 6044926
Filing Date: 2000-04-04
Classification: F01N

Abstract:
A muffler configured for use with a small general-purpose engine, comprising:a case having a first end and a second end, the case further comprising a pair of case halves, each of said case halves having flanges, said case halves being coupled to each other through their flanges;a partition plate joined to the case halves at said flanges, an interior of the case being divided into first and second chambers from front to rear in an order encountered in an entering direction of an exhaust gas from the engine by a partition plate;an inlet for introducing the exhaust gas in an entering direction into the first chamber formed in the first case half at a location closer to the first end of the case in a longitudinal direction perpendicular to the entering direction of the exhaust gas than to the second end,an outlet for discharging the exhaust gas in the second case half formed at a location closer to the second end of the case in the longitudinal direction than to the first end;a recess formed in the partition plate at a location opposed to the inlet, the recess being projected toward the second chamber and offset in a lateral direction perpendicular to the entering direction of the exhaust gas and the longitudinal direction of the case, for receiving the exhaust gas introduced into the first chamber through the inlet and for guiding the exhaust gas toward the second end of the case; anda communication orifice formed in the partition plate for providing communication between the first and the second chamber at a location offset in the lateral direction with respect to the recess, and offset closer to the first end than the inlet.