Exhaust device

An exhaust device configured to guide exhaust gas from an exhaust pipe in front of an engine to a muffler in a rear of the engine, the muffler including a first muffling chamber, the exhaust device comprising:

• a primary catalyst case accommodating a primary catalyst configured to purify the exhaust gas at a downstream side from the exhaust pipe;
• a secondary catalyst case accommodating a secondary catalyst configured to purify the exhaust gas at a downstream side from the primary catalyst;
• and
• a chamber formed with a second muffling chamber configured to reduce an exhaust noise and disposed at a downstream side from the secondary catalyst and an upstream side from the muffler, wherein
• the primary catalyst case is disposed in a front space of the engine,
• the secondary catalyst case is disposed on a front part of a lower space of the engine,
• the chamber is disposed so as to occupy at least a rear part of the lower space of the engine,
• the engine is assembled to a vehicle body frame,
• an upper down tube extends downward from a head pipe of the vehicle body frame in a center of the engine in a left-right direction, and a pair of lower down tubes branching left and right from a lower end of the upper down tube extend downward, and
• the primary catalyst case overlaps one of the lower down tubes in a front view of a vehicle body, and the secondary catalyst case is disposed on a right side of a left side down tube of the pair of lower down tubes and a left side of a right side down tube of the pair of lower down tubes.

An exhaust device configured to guide exhaust gas from an exhaust pipe in front of an engine to a muffler in a rear of the engine, the muffler including a first muffling chamber, the exhaust device comprising:

• a primary catalyst case accommodating a primary catalyst configured to purify the exhaust gas at a downstream side from the exhaust pipe;
• a secondary catalyst case accommodating a secondary catalyst configured to purify the exhaust gas at a downstream side from the primary catalyst;
• and
• a chamber formed with a second muffling chamber configured to reduce an exhaust noise and disposed at a downstream side from the secondary catalyst and an upstream side from the muffler, wherein
• the primary catalyst case is disposed in a front space of the engine,
• the secondary catalyst case is disposed on a front part of a lower space of the engine,
• the chamber is disposed so as to occupy at least a rear part of the lower space of the engine, and
• the secondary catalyst case extends obliquely rearward from one side to the other side in a left-right direction and intersects a center line of the engine extending in a front-rear direction, in a bottom view of a vehicle body.