Engine and vehicle with same

Abstract

The invention discloses an engine and a vehicle with the engine. The engine comprises a piston, a crankshaft, an adjusting element, a connecting rod and a compression ratio adjusting mechanism. The movement track distance between a main journal and the piston is e. A connecting rod neck is sleeved with the adjusting element. The distance between the connecting rod neck and the main journal is R1.The inclined angle between the center connecting line of the connecting rod neck and the main journal and the movement track of the piston is CA, and 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 ratio adjusting mechanism can adjust the position of the piston in a cylinder. The compression ratio adjusting mechanism comprises an eccentric shaft and a control rod. The control rod is connected with the adjusting element and the eccentric shaft. The included angle between the connecting rod and the adjusting element is beta, and the included angle between the connecting rod and the moving track of the piston is A1.When CA is greater than or equal to -40 degrees and less than or equal to 120 degrees, A1 is greater than or equal to 0 degree and less than or equal to 8 degrees. By adjusting the arrangement structure or size of the compression ratio adjusting mechanism, the A1 is always smaller, the lateral force of the piston to a cylinder bore is reduced, and the wear problem of the piston and the cylinder bore is avoid.

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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