Muffler and vehicle equipped with muffler

摘要

A muffler 10 includes an expansion chamber 26 and a conduit 30 that passes through the expansion chamber 26. The conduit 30 has a partition wall 35 provided at a central section thereof. An upstream section 36 provided to the upstream side of the partition wall 35 has an outflow section 32 with outflow holes 32a to permit exhaust gases to flow out of the conduit 30 and into the expansion chamber 26. A downstream section 37 provided to the downstream side of the partition wall 35 has an inflow section 33 with inflow holes 33a to permit exhaust gases to flow from the expansion chamber 26 into the conduit 30. The inner diameter DD2 of at least one section 34 of the downstream section 37 is smaller than the inner diameter UD2 of the outflow section 32. The muffler 10, when fitted to a vehicle 1, can inhibit reduction in engine performance and at the same time reduce exhaust noise volume.