Patent ID: 8544600
Filing Date: 2013-10-01
Classification: F01N

Abstract:
1. An exhaust device for an internal combustion engine for discharging an exhaust gas from said internal combustion engine through a multistage expansion type muffler having a plurality of expansion chambers for silencing a sound of said exhaust gas during passage of said exhaust gas, comprising: a first tail pipe for communicating between a most downstream one of said expansion chambers and an outside of said muffler; and a second tail pipe for communicating between an upstream one of said expansion chambers on an upstream side of said most downstream expansion chamber and the outside of said muffler, wherein said expansion chambers include first, second, and third expansion chambers arranged in the order of passage of said exhaust gas; said most downstream expansion chamber is said third expansion chamber; said upstream expansion chamber is said second expansion chamber; and a volume of said second expansion chamber is larger than a volume of said third expansion chamber, wherein said third expansion chamber is provided between said first expansion chamber and said second expansion chamber, and a small hole for adjusting a back pressure is formed through a partition wall between said first expansion chamber and said third expansion chamber.