Piston system with volume cavity formed inside

Abstract

The invention belongs to the technical field of internal combustion engines, and discloses a piston system with a volume cavity formed inside. The piston system comprises an air cylinder, a cylinder cover, a piston, a piston ring, a connecting rod, the volume cavity, a spring, moving bodies and a penetrating hole. The volume cavity is formed inside the piston. The first moving body, the second moving body, the third moving body and the fourth moving body are all arranged in the volume cavity, and the lower end face of the third moving body, the upper end face of the first moving body, the lower end face of the fourth moving body and the upper end face of the second moving body are each of a slope structure. Under the high speed working condition, when the highest combustion pressure in a combustion chamber is high, the first moving body moves rightwards, the second moving body moves leftwards, and the volume of the combustion chamber is increased; under the lower speed working condition, when the highest combustion pressure in the combustion chamber is low, the first moving body moves leftwards, the second moving body moves rightwards, and the volume of the combustion chamber is decreased. The piston system is reasonable in structure, simple in design and suitable for optimization design of engine pistons.

Description

technical field [0001] The invention belongs to a compression ratio design device in the technical field of internal combustion engines, in particular to a piston system with a volume cavity inside. Background technique [0002] The compression ratio refers to the degree to which the engine mixture is compressed, using the ratio of the total volume of the cylinder before compression to the volume of the cylinder after compression (that is, the volume of the combustion chamber). At present, the vast majority of automobiles use the so-called 'reciprocating engine'. Simply put, in the engine cylinder, there is a piston that reciprocates in a straight line and continues to cycle. There is a certain range of motion in the stroke. As far as a certain cylinder of the engine is concerned, when the stroke of the piston reaches the lowest point, the position at this time is called the bottom dead center. The volume formed by the entire cylinder including the combustion chamber is the...

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Problems solved by technology

[0003] After searching the existing literature, it is found that the patent application number is 20092014360.5, and the name is a patented technology of a mechanism that can change the compression ratio of the engine. A variable compression ratio mechanism is proposed to make the combustion efficiency higher, but its compression ratio changes. Requires artificial control, cannot achieve self-regulation

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