Engine and vehicle with same

Abstract

The invention discloses an engine and a vehicle with the same. The engine includes a piston, a crankshaft, an adjusting element, a connecting rod and a compression ratio adjusting mechanism. The distance between the main journal and the piston is e, the adjusting element is set on the connecting rod journal, and the distance between the connecting rod journal and the main journal is R1. The angle between the connecting line between the center of the hosel neck and the main journal and the movement track of the piston is CA, the connecting rod is connected with the piston and the adjusting element, the length of the connecting rod is L1, the distance between the second end of the connecting rod and the connecting rod neck is L2, and the compression The ratio adjustment mechanism can adjust the position of the piston in the cylinder. The compression ratio adjustment mechanism includes an eccentric shaft and a control rod. The control rod is connected with the adjustment element and the eccentric shaft. The angle between the connecting rod and the adjustment element is β. The included angle is A1, and when ‑40°≤CA≤120°, 0°≤A1≤8°. By adjusting the layout or size of the compression ratio adjustment mechanism, A1 is always kept small, reducing the lateral force of the piston on the cylinder bore, and improving the wear of the piston and cylinder bore.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an engine and a vehicle with the same. Background technique [0002] The compression ratio of the engine refers to the ratio of the cylinder volume when the piston moves to the bottom dead center to the combustion chamber volume when the piston moves to the top dead center. Most of the existing engines are fixed compression ratio engines, which have low fuel combustion efficiency, poor economy and high emissions. With the development of variable compression ratio technology, the engine began to increase the compression ratio adjustment mechanism, and the volume of the combustion chamber was changed by changing the position of the top dead center of the piston, thereby changing the compression ratio. [0003] The theory of thermal efficiency shows that the higher the compression ratio, the higher the thermal efficiency and the lower the fuel consumption. However, increasing the compres...

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Problems solved by technology

[0003] The theory of thermal efficiency shows that the higher the compression ratio, the higher the thermal efficiency and the lower the fuel consumption. However, increasing the compression ratio will cause knocking. Considering the suppression of knocking, the upper limit of the compression ratio will be limited. Most of the existing engines are fixed compression ratio engines , it is impossible to achieve a balance between high thermal efficiency and knock suppression; in addition, in the existing various compression ratio adjustment mechanisms, there are generally a large number of parts, a large force between the parts, and mutual interaction between the piston and the cylinder bore. Large friction force and increased wear etc.

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