Cylinder head for arched combustion chamber and gasoline engine employing same

Abstract

The invention discloses a cylinder head for an arched combustion chamber and a gasoline engine employing the cylinder head. The cylinder head comprises a cylinder head body, wherein a combustion chamber face is formed on the inner side of the cylinder head body; the combustion chamber face has an arched face structure consisting of smooth curved surfaces; the surface to volume ratio of the combustion chamber can be reduced further, the working efficiency of the gasoline engine is improved, and gas flow which enters the combustion chamber is subjected to resistance in different directions, so that fuel oil mixed gas can be well formed into turbulent flow and combusted fully; therefore, the fuel oil consumption rate is reduced effectively, combustion is facilitated, and CH+NO(x) emission can be reduced, and gasoline power is increased; and the emission reaches or even exceeds the environmental protection agency (EPA) standard in America. The power of a gasoline engine with the maximum power of 3.0 kW (the rotating speed is 3,600 rpm) can be increased to 3.5 kW and the emission is reduced from 9.0 g/kW.h to 8.0 g/kW.h; the power of a gasoline engine with the maximum power of 3.5 kW can be increased to 4.0 kW and the emission is reduced from 9.0 g/kW.h to 8.0 g/kW.h; and the emission of the two gasoline engines meets the standard of 10 g/kW.h in the EPA3 stage; therefore, the power increment and the emission reduction of the gasoline engine are obvious, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to a power machine component and its application, in particular to a gasoline engine component and its application. Background technique [0002] A gasoline engine is a power machine that uses gasoline as fuel. It is composed of cylinder, crank linkage mechanism, gas distribution system, oil supply system, lubrication system and ignition system; the cylinder head is provided with intake passage and exhaust passage, and forms the combustion chamber surface together with the cylinder, so it belongs to gasoline engine more important parts. Gasoline is burned as a mixture of fuel and air in the combustion chamber to generate a large amount of heat, which is used as driving energy. The parameters of the combustion chamber are the necessary conditions to ensure the efficient operation of the gasoline engine. [0003] In the prior art, the combustion chamber surface of the cylinder head generally adopts a wedge-shaped structure, which...

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Problems solved by technology

[0003] In the prior art, the combustion chamber surface of the cylinder head generally adopts a wedge-shaped structure, which has a relatively large surface volume ratio, but this structure is beneficial to the installation of other auxiliary structures, such as valve components; if the structure of the combustion chamber surface is changed, it will affect the intake, Arrangement of exhaust valve assembly

The existing intake and exhaust valve assembly structures cannot be applied to the installation of combustion chambers with different structures, otherwise there will be problems of loose closing, inaccurate and unsmooth movement, which will affect the normal operation of the gasoline engine

In order to solve the above problems, a spherical combustion chamber structure has appeared, which has a smaller surface-to-volume ratio and has a better impact on the performance of gasoline engines; however, due to the smooth surface of the spherical combustion chamber, it is not conducive to the mixing of combustion gases, and in order to adapt to The installation of the valve will cause a sudden change in shape on the surface of the combustion chamber, which will affect the mixing, intake and exhaust, so that the advantages of the spherical combustion chamber will not be fully utilized

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