Piston air inlet type two-stroke engine

Abstract

The invention discloses a piston air inlet type two-stroke engine, and belongs to the field of engines. The piston air inlet type two-stroke engine comprises a combustion chamber, a spark plug, an air inlet, an exhaust port, a cylinder wall, a piston, cooling fins, a scavenging air box and a flywheel, wherein the combustion chamber is arranged above the piston in a cylinder, and the spark plug is mounted at the top part; the piston is an open type air inlet piston, a plurality of axial through grooves are formed in the circumferential outer edge of the piston, and the axial through grooves serve as openings of the piston; protrusions corresponding to the axial through grooves one to one are arranged on the inner wall of the upper portion of the cylinder in the circumferential direction to form an air inlet switch; and theprotrusions and the grooves are complementary in shape, when the open type air inlet piston moves to the air inlet switch, the protrusions and the grooves are matched to separate the combustion chamber of the air cylinder from the scavenging air box. By adopting a vertical air inlet mode, the air short-circuit loss of the transverse air inlet type two-stroke engine can be avoided, meanwhile, due to multi-air-port air inlet, the turbulence degree of air flow in the cylinder is increased, gas in the cylinder and fuel oil can be fully matched, and the fuel oil utilization rate and the exhaust emission rate are increased.

Description

technical field [0001] The invention belongs to the field of engines, and in particular relates to a piston intake type two-stroke engine. Background technique [0002] The two-stroke engine has the advantages of high mechanical efficiency, high specific power and low cost, and occupies a huge market space in military, civilian, scientific research and other fields. However, in recent years, under the dual pressure of energy and environmental issues, governments of various countries have introduced increasingly strict emission regulations. Due to factors such as poor economy and emission performance of two-stroke gasoline engines, especially NOx and CO emissions, causing serious environmental pollution, and its development has been restricted to a certain extent. The main reason for the poor emission of two-stroke gasoline engines is the incomplete ventilation process: on the one hand, the fresh mixture flows directly into the exhaust port, causing short-circuit loss; on th...

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Problems solved by technology

[0004] Most of the existing technical solutions use horizontal scavenging ports, and adopt the method of layered scavenging or exhaust gas scavenging to assist the entry process. The existing technology ensures sufficient combustion in the cylinder to a certain extent. However, the layered scavenging engine will be cold The air is directly introduced into the high-temperature combustion chamber and collides with the high-temperature and high-pressure exhaust gas to generate NO 2 and CO, which increase the bad combustion pollutants in exhaust emissions; on the other hand, the mixed oil gas to be burned enters the cylinder and is discharged with the exhaust gas after combustion, which affects exhaust emissions and also loses fuel

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