Anti-backflow motorcycle exhaust

Abstract

The invention discloses an anti-reflux motorcycle exhaust device which comprises an air supply pipe, wherein the air outlet of the air supply pipe slanchwise extends into an exhaust pipe, a first bending section is arranged at the part, adjacent to the air outlet, of the air supply pipe, a second bending section is arranged at the part, adjacent to an air inlet, of the air supply pipe, and the corners of the first bending section and the second bending section are less than 90 degrees and face to opposite directions. When overlarge gas pressure occurs in an engine, the structure provided by the invention can effectively avoid the occurrence of supplied air reflux and ensure the smooth secondary air supply; and as exhaust gas can be supplemented with the fresh air, the temperature of the exhaust gas can be lowered, and the air-fuel ratio of the exhaust gas can recover to an interval of high conversion efficiency of a catalyst, thus the conversion efficiency of the exhaust gas can be improved.

Description

technical field [0001] The invention relates to an exhaust device, in particular to an anti-backflow exhaust device for motorcycles. Background technique [0002] During the working process of the internal combustion engine of the motorcycle, due to the combustion effect, it will emit a large amount of exhaust gas, which will increase air pollution. , Reduce CO, NOx, HC and other harmful components in exhaust gas. The air-fuel ratio of the combustible gas mixture is one of the key links to determine the conversion efficiency of the catalytic converter. The air-fuel ratio refers to the mass ratio of air and fuel contained in the combustible gas mixture. The best air-fuel ratio in the general motorcycle engine working environment is 14.7. At this time, the exhaust gas catalytic rate reaches the best, and the exhaust gas emission is the least. [0003] During the exhaust emission process of the internal combustion engine, due to the high flow rate of the exhaust gas, the cont...

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Problems solved by technology

[0005] At present, the motorcycles on the market generally connect the metal air supply pipe directly to the exhaust pipe at a 90-degree cutting angle, such as figure 1 However, when the engine is operating at a high load, excessive gas pressure will appear in the engine, and the exhaust gas will easily enter the air supply pipe from the exhaust pipe, resulting in the phenomenon of reverse flow of the air supply. However, the existing air supply pipes are straight pipes or The large-angle bending pipe cannot effectively suppress the phenomenon of backflow of supplementary air, resulting in insufficient supply of supplementary air, insufficient exhaust gas catalysis, and unqualified exhaust gas; One end of the trachea is connected to the exhaust pipe, and the other end is connected to the secondary air supply valve through the secondary air supply valve made of rubber. The rubber hose of the secondary air supply valve made by the manufacturer will seriously cause the temperature of the secondary air supply valve hose to be too high and cause problems such as burning.

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