Air inflation structure of secondary air inflation device for motorcycle

Abstract

The invention discloses an air inflation structure of a secondary air inflation device for a motorcycle. The air inflation structure comprises a motorcycle engine, an air filter and the secondary airinflation device; the air filter is divided into a dirty cavity and a clean cavity by a filter element assembly, the dirty cavity is provided with an air filter inlet end, and the clean cavity is provided with an air filter outlet end; the air filter outlet end is communicated with an air inlet end of an engine through an air inlet pipe and a carburetor, the secondary air inflation device is provided with an air inlet, a negative pressure port and an exhaust port, the negative pressure port of the secondary air inflation device is communicated with the air inlet end of the engine, the exhaustport is communicated with an exhaust end of the engine, and the air inlet of the secondary air inflation device is communicated with the dirty cavity of the air filter through an air inflation pipe. Air inflation of the secondary air inflation device and air intake of the engine are conducted separately, the phenomenon that the secondary air inflation device and the engine plunder air resources can be avoided, and the working performance of the engine is ensured; on the other hand, an inlet of the air inflation pipe is formed oppositely to the air inlet end of the air filter, so that the dirtycavity serves as an air inlet resonant cavity in the air inflation pipe, and air inlet noise generated during air inflation is reduced.

Description

technical field [0001] The invention relates to a secondary air supply device of a motorcycle, in particular to an air supply structure of the secondary air supply device. Background technique [0002] When the motorcycle engine is working, it will produce incompletely burned mixed gas. If it is directly discharged into the atmosphere through the exhaust pipe of the motorcycle, it will pollute the environment and cause the emission concentration to exceed the standard. Therefore, a secondary air supply device is usually installed on the engine to inject new air into the high-temperature mixed gas discharged from the engine to increase the oxygen concentration for further combustion, that is, to further oxidize CO, HC, and NO_X, thereby reducing CO, HC, and The emission of NO_X makes the exhaust gas comply with the environmental protection standard of motorcycle emission. [0003] In the prior art, the secondary air supply device is connected to the clean chamber of the air ...

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Problems solved by technology

[0003] In the prior art, the secondary air supply device is connected to the clean chamber of the air filter through the air supply pipe. Due to the limited layout space, the inlet of the air supply pipe is often located on the same side as the air outlet end of the air filter. As a result, when the engine is running, the secondary air supply device will be separated from the The air intake of the engine forms a phenomenon of grabbing air, that is, when the engine is intake air, the secondary air supply device may also be inhaling air, resulting in a decrease in the engine intake pressure and intake air volume, which affects the performance of the engine; on the other hand, the supplementary air supply The inlet of the air pipe and the air outlet of the air filter are set together in the clean chamber of the air filter, which respectively supply air to the secondary air supply device and the engine. Disturbance, producing loud intake noise

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