Compact long-path layered scavenging structure cylinder body

Abstract

The invention discloses a compact long-path layered scavenging structure cylinder body. The compact long-path layered scavenging structure cylinder body comprises a cylinder body, a middle side cover and an outer side cover. A mixed gas scavenging duct is arranged on the cylinder body and communicates with a crankcase and a main scavenging port on the middle side cover. A middle main scavenging duct is arranged on the outer side cover, two auxiliary scavenging ducts are further arranged on the two sides of the outer side cover and communicate with the two auxiliary scavenging ports in the middle side cover, and the two auxiliary scavenging ports in the middle side cover communicate with a cylinder body scavenging duct. The compact long-path layered scavenging structure cylinder body has the advantages that on the premise that the structure of the gasoline engine is compact, the length of the whole scavenging path of the cylinder body can be increased, the inlet air storage amount of pure air in the scavenging path is increased, residual waste gas in a combustion chamber is reduced, escape of fresh mixed gas is reduced, and emission is reduced; and the proportion of pure air entering the crankcase in the air inlet process can be reduced, mixed gas in the next cycle is prevented from being too thin, and the combustion effect is improved.

Description

technical field [0001] The invention relates to the technical field of two-stroke gasoline engines, in particular to a cylinder block with a compact long-path layered scavenging structure. Background technique [0002] At present, the structure of low-emission two-stroke gasoline engines commonly seen in the market is divided into two types. One is the exhaust gas post-treatment structure, that is, a certain amount of catalyst is added in the muffler, and the exhaust gas is secondarily burned in the muffler to reduce emissions. Due to the high combustion temperature in the muffler, the temperature of the gasoline engine is high during the operation of the gasoline engine, and the safety and comfort are poor. In addition, as the cost of precious metals for catalysts increases year by year, gasoline engine manufacturers have to gradually reduce the catalyst. The content of precious metals or changing the formula will lead to gasoline engine emissions getting closer and closer ...

AI Technical Summary

Problems solved by technology

[0002] At present, the structure of low-emission two-stroke gasoline engines commonly seen in the market is divided into two types. One is the exhaust gas post-treatment structure, that is, a certain amount of catalyst is added in the muffler, and the exhaust gas is secondarily burned in the muffler to reduce emissions. Due to the high combustion temperature in the muffler, the temperature of the gasoline engine is high during the operation of the gasoline engine, and the safety and comfort are poor. In addition, as the cost of precious metals for catalysts increases year by year, gasoline engine manufacturers have to gradually reduce the catalyst. The content of precious metals or changing the formula will lead to gasoline engine emissions getting closer and closer to the limit; the other type is the stratified scavenging structure, which has been widely used in various two-stroke gasoline engines, but is limited by engine power, mixed gas Concentration, scavenging, scavenging structure, etc., make the traditional stratified-scavenging gasoline engine, especially the small-displacement stratified-scavenging gasoline engine below 50cc, have to perform lean combustion, the durability and reliability of the engine are not high, and the original emission is usually difficult Meets or easily exceeds emissions regulations

[0003] The common small-displacement stratified-scavenging gasoline engine has a smaller volume and compact structure, so that the scavenging path between the cylinder combustion chamber and the crankcase is larger and the displacement stratified-scavenging gasoline engine is shorter. The storage of pure air in the scavenging path is insufficient, or the amount of mixed gas mixed with the next cycle is large, which reduces the quality of the scavenging air. In addition, the power of the small-displacement gasoline engine is small, and it is difficult to meet the emission requirements; therefore, it is urgent to develop a A compact long-path layered scavenging structure cylinder to improve the quality of scavenging and reduce engine emissions

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