Variable-compression-ratio mechanism for engines, variable-compression-ratio engine and automobile

Abstract

The invention discloses a variable-compression-ratio mechanism for engines, a variable-compression-ratio engine and an automobile. The variable-compression-ratio mechanism comprises a through hole, pistons, rotating rings, limit parts, and a worm, wherein the through hole is positioned in a cover body; the pistons are positioned in the through hole and can move in the through hole in the axial direction, each piston comprises a thread part and a sealing part in the axial direction, opposite circumferential surfaces of the sealing parts and opposite circumferential surfaces of the through hole are in torque resisting matching, and external threads are formed in the external surface of each thread part; the rotating rings are mounted at the outer parts of the thread parts in a sleeving manner, internal threads are formed in the internal circumferential surfaces of the rotating rings and are in screwed matching with the external threads, and a plurality of bar-shaped teeth which are distributed at intervals in the circumferential direction are arranged at the external circumferential surfaces of the rotating rings; the limit parts are respectively positioned on two sides of the axial direction of the rotating rings and connected with the inner wall of the through hole; the worm is perpendicular to the pistons and is positioned in the cover body, at least one end of the worm is positioned outside the cover body, and helical teeth of the worm are meshed with the bar-shaped teeth of the rotating rings. The variable-compression-ratio engine with an air cylinder cover of the scheme is simple in structure and convenient to operate, and the knockings generated when the engine is highly loaded can be can be avoided by regulation of compression ratio.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, in particular to a variable compression ratio mechanism for an engine, a variable compression ratio engine and an automobile. Background technique [0002] In existing automobile engines, the compression ratio is a very important concept in the engine. The compression ratio indicates the degree of compression of the gas in the cylinder. It is the ratio of the volume of the gas in the cylinder before compression to the volume of the gas after compression, that is, the cylinder The ratio of the total volume to the volume of the combustion chamber is called the compression ratio. Increasing the compression ratio can increase the cylinder pressure and combustion efficiency, but it is easy to cause engine knocking. Knocking means that the pressure in the cylinder exceeds the critical value, and gasoline is ignited before ignition due to compression, which will bring great harm to the engine. b...

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Problems solved by technology

[0004] The problem solved by the present invention is that the existing variable compression ratio mechanism has complex structure and difficult operation

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