Patent ID: 7828114
Filing Date: 2010-11-09
Classification: F01N

Abstract:
1. An exhaust device for a motorcycle engine, in which an exhaust chamber is connected to a downstream side of an exhaust pipe connected to an exhaust of an engine and a downstream side of the exhaust chamber is connected to a muffler, comprising: an exhaust chamber inlet facing a back and forth direction; and an exhaust chamber outlet facing a side; said muffler including a front portion formed in an approximate triangle and a main body, the front portion is closed to an acute front end portion with an upper surface of the front portion being formed as a taper surface extending forwardly and obliquely downwardly; said exhaust chamber outlet being connected to a muffler inlet which is provided, to face the side, at a lateral surface of the front portion of the muffler disposed to extend in the back and forth direction; a separator is provided inside of the muffler to partition the inside of the muffler into a front chamber and a rear chamber, said separator being disposed in a central portion of the muffler wherein exhaust gas expands in the front portion of the muffler along the muffler to the separator for providing an increased area for the exhaust gas to expand, wherein at least one communication pipe starts within the front chamber of the muffler, passes through the separator, and ends within the rear chamber such that the exhaust gas in the front chamber of the muffler and the rear chamber of the muffler communicates with each other, wherein the front end portion of the front portion of the muffler partially overlaps a rear portion of the exhaust chamber at a portion of the exhaust chamber outlet, and wherein a laterally-facing outlet pipe is provided at a right-hand side of the rear end portion of the exhaust chamber so as to project rightward outwardly and is joined to a left-lateral surface of a front end of the muffler.