Tumble guide type high compression ratio piston of gasoline engine

Abstract

The invention belongs to the technical field of pistons, and particularly relates to a tumble guide type high compression ratio piston of a gasoline engine. The piston comprises a piston top face, a first boss top face, a second boss top face, a hemispheric piston pit, a first exhaust valve evasion pit extending surface, a second exhaust valve evasion pit extending surface, a first inlet valve evasion pit extending surface, a second inlet valve evasion pit extending surface and a tumble channel. The first exhaust and inlet valve evasion pit extending surfaces and the first boss top face together form a boss which is higher than the piston top face. The second exhaust and inlet valve evasion pit extending surfaces and the second boss top face together form a boss which is higher than the piston top face. The first and second boss top faces are parallel to the piston top face. The grooved tumble channel is located between the first boss top face and the second boss top face, and the upper surface of the tumble channel and the piston top face are in the same plane. The hemispheric piston pit is located at the geometrical center of the piston. By means of the shape of the piston surface, the high compression ratio is maintained, and meanwhile the tumble strength and the combustion speed are not reduced; and atomization of fuel oil and generation of a gas mixture are controlled, and the tendency of the knock is inhibited.

Description

technical field [0001] The invention belongs to the technical field of forming the piston surface structure of a combustion chamber of a gasoline engine, and specifically relates to a tumble-flow-guiding high-compression-ratio piston of a gasoline engine. Background technique [0002] At present, the number of automobiles in our country is increasing rapidly, the impact on the environment and the demand for oil are increasing, and the situation of energy conservation and emission reduction in our country is becoming increasingly severe. For this reason, my country has also formulated more and more stringent emission regulations and fuel consumption regulations. Therefore, the core of engine development is to improve combustion efficiency, reduce emissions and fuel consumption, and the focus of engine development is the combustion system. The development of the combustion system mainly includes the design of the combustion chamber structure, intake system, exhaust system, fue...

AI Technical Summary

Problems solved by technology

In view of the requirements of fuel consumption regulations, the current gasoline engine generally increases the compression ratio, but at the same time brings the problem of enhanced knock

The existing high compression ratio piston generally simply raises the top surface of the piston to reduce the volume of the combustion chamber, thereby increasing the compression ratio. flow development, which in turn slows down the combustion rate and enhances the tendency to detonate

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