Patent ID: 7383912

Claim:
An exhaust pipe structure comprising: an exhaust passage for exhaust gas discharged from a vehicle-installed engine that is provided below a floor of a vehicle; at least one muffler provided on an intermediate portion of the exhaust passage, wherein the at least one muffler includes an only one main muffler having the greatest muffler capacity among the at least one muffler, wherein the main muffler has an external cylinder forming an outer shell portion of the main muffler, wherein the external cylinder has a circular sectional shape having a diameter of 100 mm to 150 mm, or a sectional shape that is substantially equal to an area of the circular sectional shape, and the external cylinder has a length of 800 mm to 1200 mm, and wherein the only one main muffler is disposed in the same exhaust passage as the at least one muffler, a downstream-side exhaust pipe located downstream of the main muffler, a joint connecting the main muffler and the downstream-side exhaust pipe, wherein the joint is formed by a vibration absorption mechanism that is provided between the main muffler and the downstream-side exhaust pipe and that absorbs a vibration transmitted between the main muffler and the downstream-side exhaust pipe, by deformation of the joint, and a catalytic converter provided integrally with the main muffler not via an exhaust pipe.