Patent ID: 8434588
Filing Date: 2013-05-07
Classification: B60K,F01N

Abstract:
1. An exhaust device for an vehicle internal combustion engine, comprising: an exhaust pipe of the internal combustion engine mounted in a vehicle which branches at a branching point into a downstream-side first branch pipe and a downstream-side second branch pipe; a first silencer attached to the first branch pipe; a second silencer attached to the second branch pipe; and a pipe joint that is provided on an upstream side of the silencer provided on one branch pipe out of the first branch pipe and the second branch pipe, and that permits the one branch pipe to partially bend at the upstream side of the silencer, wherein the first branch pipe and the second branch pipe are different from each other in at least one of bending rigidity and mass to result in different resonant frequencies in the first branch pipe and the second branch pipe so that when the first branch pipe and the second branch pipe are vibrated in a specific vibration frequency range, vibrations of the first and second branch pipes cancel out each other at the branching point.