Exhaust device

Abstract

The invention provides an exhaust device which ensures a silencing chamber below an engine and realizes miniaturization of a silencer. An exhaust device (50) guides exhaust gas from an exhaust pipe (51L) in front of an engine (30) to a muffler in rear of the engine. The exhaust device is provided with: a primary catalyst case (53) in which a primary catalyst (54) for purifying exhaust gas downstream from the exhaust pipe is housed; a secondary catalyst case (61) in which a secondary catalyst (62) for purifying exhaust gas downstream from the primary catalyst is housed; and a chamber (71) in which a noise reduction chamber for reducing exhaust noise is formed downstream from the secondary catalyst. The primary catalyst housing is disposed in a front space of the engine, the secondary catalyst housing is disposed in front of a lower space of the engine, and the chamber is disposed so as to occupy at least a rear side of the lower space of the engine.

Description

technical field [0001] The present invention relates to an exhaust device. Background technique [0002] Conventionally, as an exhaust device of a saddle-type vehicle, an exhaust device in which a primary catalyst case is arranged in front of an engine and a secondary catalyst case is arranged under the engine is known (for example, refer to Patent Document 1). A starter catalyst is accommodated in the primary catalyst case, and a main catalyst is accommodated in the secondary catalyst case. Exhaust gas is sent from the pair of exhaust ports to the primary catalyst case through the upstream exhaust pipe, and exhaust gas is sent from the primary catalyst case to the secondary catalyst case through the downstream exhaust pipe. The primary catalytic case is activated in advance by approaching the exhaust port, and the secondary catalytic case is activated in advance by the exhaust gas heated by the catalytic reaction. [0003] prior art literature [0004] Patent Literature ...

AI Technical Summary

Problems solved by technology

[0007] However, in the exhaust device described in Patent Document 1, the lower part of the engine is occupied by the secondary catalyst case, and it is difficult to secure a sufficient volume of the muffler chamber on the upstream side of the muffler.

Therefore, the volume of the muffler chamber in the muffler increases, leading to an increase in the size of the muffler

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