Patent ID: 8833513
Filing Date: 2014-09-16
Classification: F01N

Abstract:
1. An exhaust muffler including a tail pipe comprising: a chamber provided in the middle of an exhaust pipe for an internal combustion engine; and a tail pipe which is connected to an end portion of an exhaust opening of the exhaust pipe and in which a plurality of fins are disposed inside thereof so as to form a spiral shape toward a discharging direction of exhaust gas, wherein: the chamber comprises a cover body surrounding a periphery is a side surface of the exhaust pipe and an internal exhaust pipe in which a plurality of diffusion pores are drilled on the side surface of the exhaust pipe surrounded by the cover body; the internal exhaust pipe comprises a diffusion exhaust pipe having a wide bore, which is provided on an inlet side of the exhaust gas and a compression exhaust pipe having a narrow bore, which is provided on an outlet side of the exhaust gas; the diffusion pores are drilled on a portion of the side surface of the internal exhaust pipe in the chamber, the diffusion exhaust pipe and the compression exhaust pipe are connected in series with each other, and a partition plate bisecting the inside of the diffusion exhaust pipe and the compression exhaust pipe in the longitudinal direction is formed; and the diffusion pores are drilled to be distributed on symmetrical positions in a range of 30to 60% of the periphery of the internal exhaust pipe through the partition plate of the peripheral surface of the diffusion exhaust pipe.