초록 ▼

A first connection pipe, which penetrates a partition wall, and extends to a second expansion chamber side from inside a first expansion chamber, and a second connection pipe, which extends to an exhaust outlet side from the partition wall inside the second expansion chamber are provided; first oute

A first connection pipe, which penetrates a partition wall, and extends to a second expansion chamber side from inside a first expansion chamber, and a second connection pipe, which extends to an exhaust outlet side from the partition wall inside the second expansion chamber are provided; first outer periphery connection holes, which allow exhaust gas from an exhaust pipe to flow out to the second expansion chamber, are formed in the outer peripheral surface of the first connection pipe; second outer periphery connection holes which allow the exhaust gas having flowed out to the second expansion chamber through the first outer periphery connection holes to flow into the second connection pipe, are formed in the outer peripheral surface of the second connection pipe; the first connection pipe and the second connection pipe are arranged such that they are partially parallel to each other; and the first outer periphery connection holes are arranged closer to the exhaust outlet side than the second outer periphery connection holes.

대표청구항 ▼

1. An exhaust system comprising a muffler, which is connected to an exhaust pipe guiding exhaust gas of an engine, and which extends from said exhaust pipe side to the side of an exhaust outlet discharging said exhaust gas to the outside, said muffler including a tube, which extends between said exh

1. An exhaust system comprising a muffler, which is connected to an exhaust pipe guiding exhaust gas of an engine, and which extends from said exhaust pipe side to the side of an exhaust outlet discharging said exhaust gas to the outside, said muffler including a tube, which extends between said exhaust pipe side and said exhaust outlet side, and in which an expansion chamber is formed, wherein:said muffler further includes a partition wall for partitioning the inside of said tube;said partition wall divides said expansion chamber into a first expansion chamber on said exhaust pipe side, and a second expansion chamber on said exhaust outlet side;said muffler further includes a first connection pipe, which is arranged so as to penetrate said partition wall and extend to said second expansion chamber side from inside said first expansion chamber, and a second connection pipe, which is arranged so as to extend to said exhaust outlet side from said partition wall inside said second expansion chamber;a first outer periphery connection hole, which allows said exhaust gas from said exhaust pipe to flow out to said second expansion chamber, is formed in the outer peripheral surface of said first connection pipe that faces said second expansion chamber;a second outer periphery connection hole, which allows said exhaust gas having flowed out to said second expansion chamber through said first outer periphery connection hole to flow into said second connection pipe, is formed in the outer peripheral surface of said second connection pipe that faces said second expansion chamber;said first connection pipe and said second connection pipe are arranged such that they are at least partially parallel to each other;said first outer periphery connection hole is arranged closer to said exhaust outlet side than said second outer periphery connection hole; andan opening area of said second outer periphery connection hole is smaller than an opening area of said first outer periphery connection hole. 2. The exhaust system according to claim 1, wherein: an end part of said second connection pipe on said exhaust pipe side is pressed against said partition wall;a third connection hole, which allows said exhaust gas having flowed out to said first expansion chamber from said exhaust pipe to flow into said second connection pipe, is formed in said partition wall; andsaid second connection pipe is configured to allow said exhaust gas having flowed into said second connection pipe through said third connection holes, and said exhaust gas having flowed into said second connection pipe through said second outer periphery connection hole interfere with each other. 3. The exhaust system according to claim 2, wherein: a distal aperture of said first connection pipe on said exhaust pipe side, allows said exhaust gas having flowed out to said first expansion chamber from said exhaust pipe to flow into said first connection pipe;said distal aperture is arranged closer to said exhaust pipe side than said third connection hole; andsaid first outer periphery connection hole is arranged in said second expansion chamber. 4. The exhaust system, according to claim 1, wherein a lid member, which closes a distal aperture of said first connection pipe on said exhaust outlet side, at a position closer to said exhaust outlet side than said first outer periphery connection hole, is provided in an end part of said first connection pipe on said exhaust outlet side. 5. The exhaust system according to claim 1, wherein: said first connection pipe and said second connection pipe have cylindrical shapes; andan inner diameter of said first connection pipe is the same or smaller than an inner diameter of said second connection pipe.