Closed type low-emission backflow scavenging passage air cylinder for small gasoline engine

Abstract

The invention discloses a closed type low-emission backflow scavenging passage air cylinder for a small gasoline engine. The closed type low-emission backflow scavenging passage air cylinder for the small gasoline engine comprises a cylinder body, and an inner cavity of the cylinder body is arched upwards to form a combustion chamber. An air inlet is formed in the lower portion of the cylinder wall on one side of the cylinder body, an exhaust port is formed in the cylinder wall on the other side of the cylinder body, scavenging ports are formed in the cylinder walls on the two sides of the cylinder body between the air inlet and the exhaust port separately, one scavenging port serves as a main scavenging port, the other scavenging port serves as an auxiliary scavenging port, side covers are fixed to the positions, corresponding to the scavenging ports, of the outer surface of the cylinder wall of the cylinder body in a covering mode separately, and scavenging ducts are defined by the side covers and the cylinder walls at the corresponding positions of the cylinder body. The air cylinder is novel in structure and reliable in performance, the requirements of reducing tail gas emission and meeting emission regulations are met, the working temperature of the air cylinder is lowered, and the power of the small gasoline engine is improved.

Description

technical field [0001] The invention relates to the field of gasoline engine cylinders, in particular to a closed-type low-emission backflow scavenging passage cylinder for small gasoline engines. Background technique [0002] The small two-stroke gasoline engine has high power, stable operation, reliable operation, small size and light weight, and is widely used in the field of hand-held garden tools such as brush cutters, chain saws, and hair dryers. Among them, the cylinder is an important part of the small gasoline engine, it bears high mechanical load and thermal load, and its geometric shape is complicated, and the heating of each part is uneven. [0003] When a small gasoline engine is working, under the action of the highest explosion pressure and the temperature difference between the inside and outside of the cylinder wall, the cylinder is subjected to considerable mechanical stress and thermal stress. And the temperature distribution around it is very uneven, whi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a closed low-emission backflow scavenging channel cylinder for a small gasoline engine to solve the problems of unreasonable heat dissipation structure and unstable scavenging caused by a single scavenging structure in the prior art gasoline engine cylinder

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