Patent ID: 11919603
Assignee: ZHEJIANG CFMOTO POWER CO., LTD
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A straddle-type vehicle comprising:
a frame defining a front end and a rear end;
wheels including front and rear wheels supporting the frame;
an engine mounted on the frame for providing power to the vehicle, which comprises a main body and a cylinder head connected to the main body and positioned above the main body;
an intake and exhaust system, comprising an intake assembly for supplying air to the engine and an exhaust assembly for discharging exhaust gas generated by the engine, wherein the exhaust assembly comprises:
a muffler mounted on the frame, inside of which is a catalyst for promoting redox of exhaust gas, the muffler having a front part, a rear part, and a middle part between the front part and the rear part, wherein the muffler defines:
a resonance cavity;
an exhaust cavity; and
an air intake cavity located between the resonance cavity and the exhaust cavity; and

an exhaust pipe located between the muffler and the cylinder head, one end of which is connected to the cylinder head, and the other end being connected to the middle part of the muffler, wherein the exhaust pipe is connected to the air intake cavity such that exhaust gas enters into the resonance cavity through the air intake cavity, and then flows into the exhaust cavity;

a brake system associated with the wheels;
a transmission system for transmitting power from the engine to the wheels;
a fuel system for providing fuel to the engine; and
a saddle seat supported on the frame and located above the engine;, wherein the engine is oriented with its cylinder head positioned toward the rear end of the frame, with a horizontal distance between the cylinder head and a front axle of the vehicle defined as Le, and a horizontal distance between the cylinder head and a rear axle of the vehicle defined as Lf, wherein Le≥2Lf.