Novel double-piston two-stroke engine

Abstract

The invention relates to the technical field of engines, and specifically relates to a novel double-piston two-stroke engine. The novel double-piston two-stroke engine comprises an air cylinder and acrankcase, wherein a first piston and a second piston sleeve into the air cylinder in a reciprocating motion manner; the first piston and the air cylinder form a fuel compression chamber in a limitingmanner, and an air inlet port is formed in the top of the air cylinder in a manner of corresponding to the fuel compression chamber; the first piston, the second piston and the air cylinder form a combustion chamber in a limiting manner, and a spark plug and an air exhaust port are formed at the opposite side of the air cylinder in a manner of corresponding to the combustion chamber separately; the second piston is driven through a crank connecting rod and rotatably supported on a crank arm in the crankcase; and a fuel channel communicating the fuel compression chamber with the combustion chamber, and a control valve controlling the fuel channel to be opened or closed are arranged on the first piston. The novel double-piston two-stroke engine is compact, reasonable and novel in structure,and stable in operation state; and with the adoption of the separated air inlet port and air exhaust port, and a double-piston structure which is arranged in a matching manner, separation for fresh fuel gas and combustion tail gas can be perfectly realized, so that waste gas emission and fuel consumption are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of two-stroke engines, in particular to a novel double-piston two-stroke engine. Background technique [0002] Two-stroke engines have the advantages of portability, simplicity, low manufacturing cost, and large "thrust-to-weight ratio", and are widely used in the field of hand-held tools, especially hand-held tools such as brush cutters, chain saws, and blowers. However, in today's increasingly stringent environmental protection requirements, domestic and foreign companies have set lower exhaust emission limits for small two-stroke engines. ways to reduce exhaust emissions. The scavenging and exhausting of the two-stroke engine are carried out near the bottom dead center of the piston, and the gas ports are all located at the lower end of the cylinder, and the bottom dead center is arranged symmetrically; , because the scavenging port is closed before the exhaust port to generate additional exhaust; there...

AI Technical Summary

Problems solved by technology

The scavenging and exhausting of the two-stroke engine are carried out near the bottom dead center of the piston, and the gas ports are all located at the lower end of the cylinder, and the bottom dead center is arranged symmetrically; , because the scavenging port is closed before the exhaust port to generate additional exhaust; therefore, during the ventilation process of the two-stroke engine, a part of the combustible mixture is discharged together with the exhaust gas without participating in the combustion, and more than 10% of the fresh mixture will be lost. Greatly increased the consumption of fuel and lubricating oil; at the same time, it caused serious pollution from the two-stroke engine, and the pollutant emission value was much higher than that of the four-stroke engine

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