Patent ID: 7263826
Filing Date: 2007-09-04
Classification: F01N,Y02A,Y02T

Abstract:
1. A muffler device with catalysts for improving purifying exhaust gas of nitrogen oxides within a motorcycle exhaust pipe; the device comprising: a muffler divided into three chambers, a first chamber, a second chamber, and a third chamber; the first and second chamber being spaced by a first partition board; the second and third chambers being isolated by a second partition board; wherein there are vents being formed on the first and second partition board so that air can flowing through the vents; the muffler further including a muffler outlet; a front exhaust pipe connected to an exhaust terminal of an engine for receiving exhausting gas from the engine; a front reduction catalyst disposed within the front exhaust pipe near the exhaust terminal of an engine; a rear exhaust pipe provided with a secondary air inlet behind the front reduction catalyst for introducing secondary air therein; wherein when there are rear reduction catalysts disposed in the rear exhaust pipe, and a secondary air inlet is located behind the rearmost of the front reduction catalysts; wherein the front exhaust pipe and the rear exhaust pipe are located within the muffler; an outlet of the rear reduction catalyst is opened to the first chamber so that gas flowing out of the rear exhaust pipe will enter into the first chamber, and then flow into the second chamber; and then to the third chamber; then the exhaust gas flows out of the muffler from the muffler outlet.