Suspended type compression ratio variable device

Abstract

A suspended type compression ratio variable device belongs to the technical field of internal combustion engines and comprises an air cylinder a cylinder cover, a piston, piston rings, a connecting rod, a volume cavity, hanger plates, springs and a moving body, wherein the volume cavity is arranged in the center of the piston; the first hanger plate and the second hanger plate are both arranged at the top end of the volume cavity; the moving body is arranged in the volume cavity; and the two ends of the moving body are connected with the first hanger plate and the second hanger plate through the first spring and the second spring respectively. Under a high speed working condition, when the highest combustion pressure in a combustion chamber is higher, the moving body moves down, and the volume of the combustion chamber is increased; and under a low speed working condition, when the highest combustion pressure in the combustion chamber is lower, the moving body moves down, and the volume of the combustion chamber is reduced. The suspended type compression ratio variable device is reasonable in structure, simple in design and applicable to the optimization design of the engine compression ratio.

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 hanging type variable compression ratio device. 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 i...

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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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