Stratified scavenging two-stroke gasoline engine

Abstract

The invention provides a layered scavenging two-stroke gasoline engine, and belongs to the technical field of gasoline engines. According to the layered scavenging two-stroke gasoline engine, a semi-closed inner channel is formed in a piston. When the piston ascends in a cylinder body, the air is stored in the semi-closed inner channel from an air inlet channel in advance, and then enters scavenging channels, mixed gas enters the scavenging channels from a mixed gas inlet channel afterwards, and therefore when scavenging operation is conducted, a large amount of air is scavenged in advance, then the mixed gas is scavenged, and the quantity of the mixed gas is greatly reduced. In addition, due to the facts that the scavenging channels on the two sides of the cylinder body are of an asymmetric structure, and are different in structure, paths are different, the gas has different flowing performance in the scavenging channels of the cylinder body, and vortexes are generated when the gas flows into a combustion chamber, the scavenging efficiency is greatly improved, and emission of compounds such as HC and CO in exhaust gas is reduced.

Description

technical field [0001] The invention belongs to the technical field of gasoline engines, in particular to a two-stroke gasoline engine capable of reducing the discharge of compounds such as HC and CO in tail gas. Background technique [0002] At present, in stratified scavenging two-stroke gasoline engines, a part of the air is pre-stored in the scavenging channel to scavenge first, so as to reduce the phenomenon that the mixed gas is directly discharged with the exhaust gas without combustion, thereby effectively reducing harmful components in the exhaust gas such as HC and CO. compounds, protecting the environment. For example, ZL201520130727.1 is a layered scavenging two-stroke gasoline engine cylinder, which has a large scavenging channel and a small scavenging channel with different cross-sectional areas. A throttle plate is arranged in the small scavenging channel, and the air is stored in the scavenging channel through the piston. During scavenging, the air enters th...

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Problems solved by technology

However, a large number of tests have shown that when the engine is running at high speed, the amount of air stored in the scavenging passage is relatively small. When scavenging, there is not only air, but also part of the unburned mixture involved in the removal of exhaust gas. Therefore, the exhaust gas cannot be completely exhausted. Eliminating the emission of compounds such as HC and CO is not conducive to environmental protection. Therefore, there is an urgent need for a stratified scavenging two-stroke gasoline engine with a large amount of air to be scavenged first and high scavenging efficiency, which can effectively reduce HC and CO in the exhaust gas. Compound content, good protection of the environment

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