Gasoline engine

Abstract

The invention discloses a gasoline engine and belongs to the field of piston internal combustion engines. The gasoline engine comprises an air cylinder body provided with a cylinder cavity and a crankshaft box provided with a crankshaft chamber. The air cylinder body is located above the crankshaft box and the inner wall of the air cylinder body is provided with a gas inlet and a gas exhaust hole. A sealed scavenging flue group is further arranged. The scavenging flue group is used for communicating the cylinder cavity with the crankshaft chamber. The scavenging flue group comprises the first scavenging flue and the second scavenging flue. The first scavenging flue and the second scavenging flue form a first scavenging port and a second scavenging port in the inner wall of the air cylinder body respectively. The first scavenging flue and the second scavenging flue form a first gas flue port and a second gas flue port in the inner wall of the crankshaft box respectively The first scavenging port is closer to the gas exhaust hole than the second scavenging port. The second gas flue port is located in the bottom of the crankshaft box. The first gas flue port is higher than the second gas flue port. Thin combination gas and dense combination gas are separated, the thin combination gas is used for expelling the waste gas after combustion out through the gas exhaust hole, the fuel losses and toxic substances in tail gas are reduced and the thermal efficiency is improved by 20% to 30%.

Description

technical field [0001] The invention relates to the field of piston internal combustion engines, in particular to a gasoline engine. Background technique [0002] The working principle of the usual two-stroke gasoline engine is as follows: the piston goes up, the exhaust hole and the scavenging port are closed, and the mixture in the cylinder begins to be compressed; At the top dead center, the spark plug ignites and burns; because the spark plug ignites the mixed gas, it pushes the piston down to do work; because the piston moves down, the mixed gas in the crankcase is compressed, and the one-way valve in front of the air intake hole is automatically closed. The gas in the crankcase is pre-compressed; when the piston is about to reach the bottom dead center, the exhaust hole is opened to start exhausting, and at the same time, the pre-compressed mixed gas in the crankcase enters the cylinder through the scavenging port, and the exhaust gas is discharged from the exhaust hol...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a gasoline engine to solve the problem that the existing two-stroke gasoline engine uses fresh mixed gas to squeeze out the exhaust gas after combustion in the cylinder, causing the richer mixed gas to be discharged together with the exhaust gas, resulting in fuel loss. bigger problem

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