Patent ID: 8636103

Claim:
A muffler for a vehicle, comprising: a main muffler disposed in front of a rear suspension when viewing from a front of the vehicle; a plurality of baffles dividing an interior of the main muffler into a plurality of chambers; an inlet pipe installed substantially at an center of one side of the main muffler and passing through the plurality of the baffles; one discharge pipe installed parallel to the inlet pipe in the main muffler and passing through the plurality of the baffles, wherein the discharge pipe is provided for exhausting an exhaust gas flowed in the inlet pipe to an exterior of the main muffler; an intermediate pipe installed in the main muffler and having an inlet port disposed in a chamber that is the same as an outlet port of the inlet pipe; and a variable valve selectively opened or closed in response to a back pressure of the exhaust gas from an outlet port of the intermediate pipe; wherein the plurality of chambers includes first, second, third, fourth and fifth chambers that are partitioned by means of first, second, third and fourth baffles; wherein the inlet pipe includes a first array of punched holes, a second array of punched holes and a third array of punched holes that are formed on an outer circumferential surface of the inlet pipe passing through the second chamber, the third chamber and the fourth chamber, respectively; wherein the discharge pipe includes a fourth array of punched holes and a fifth array of punched holes that are formed on an outer circumferential surface of the discharge pipe passing through the first chamber and the second chamber, respectively; wherein the fourth chamber, through which the inlet pipe passes, is filled with glass wool; and wherein the third array of punched holes formed on the outer circumferential surface of the inlet pipe in the fourth chamber allows the exhaust gas in the inlet pipe to flow toward flow holes of the fourth baffle through the glass wool.