Stretching type compression ratio variable device

Abstract

The invention relates to a stretching type compression ratio variable device, and belongs to the technical field of internal combustion engines. The stretching type compression ratio variable device comprises an air cylinder, a cylinder cover, a piston, a first piton ring, a second piston ring, a connecting rod, a volume cavity, a moving body and a spring, wherein the cylinder cover is arranged at the upper end of the air cylinder; the piston is arranged inside the air cylinder; a combustion chamber is formed by the air cylinder, the cylinder cover and the piston together; the first piston ring and the second piston ring are respectively arranged on the top of the piston; the connecting rod is connected with the piston together; the volume cavity is arranged on the top of the piston; the moving body is arranged inside the volume cavity; the two ends of the spring are respectively connected with the lower end face of the moving body and the lower end face of the volume cavity. Under a high-speed working condition, when the pressure inside the combustion chamber is maximum and the combustion pressure is higher, the moving body moves downwards, and the volume of the combustion chamber becomes larger; under a low-speed working condition, when the pressure inside the combustion chamber is maximum and the combustion pressure is lower, the moving body moves upwards, and the volume of the combustion chamber becomes smaller. The stretching type compression ratio variable device is reasonable in structure and simple in design, and is suitable for the optimal design of the compression ratio of an engine.

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 stretching 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 chambe...

AI Technical Summary

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

Images