Piston combustion chamber for air valve type two-stroke and four-stroke convertible high-power diesel engine

Abstract

The invention provides a piston combustion chamber for an air valve type two-stroke and four-stroke convertible high-power diesel engine, and particularly relates to the field of engines. Comprising a central platform a, a conical surface b, an arc c, a linear section d, a linear section f, an arc e, a combustion chamber side wall and a plum blossom petal structure, the plum blossom petal structure is arranged at the top of the combustion chamber side wall, the height of the central platform a is the same as that of an original combustion chamber, the compression ratio of the local plum blossom type combustion chamber is the same as that of the original combustion chamber, and the arc c connected with the conical surface b is the same as the original combustion chamber in shape and size. The two-stroke mode and the four-stroke mode are both considered on the two-stroke and four-stroke conversion diesel engine, the original low oil consumption and low emission characteristics in the four-stroke mode are guaranteed, and meanwhile the high heat load problem of the piston in the two-stroke mode is relieved on the basis that the piston material is not changed.

Description

technical field [0001] The invention relates to a device in the field of engines, in particular to a piston combustion chamber for a valve-type two-four-stroke convertible high-power diesel engine. Background technique [0002] In order to increase the power density of the diesel engine, the technical measures usually used are to increase the cycle intake air volume and fuel injection volume of the engine, thereby increasing the combustion explosion pressure of the diesel engine. However, limited by the capacity of the supercharger and the strength of the engine material, the room for boosting the burst pressure is getting smaller and smaller. At the same speed, the power frequency of the diesel engine in the two-stroke working mode is twice as high as that of the four-stroke. Therefore, when the power is increased, there is no need for excessive burst pressure, and the power density can be improved on the basis of the original material and structure of the engine. the goal...

AI Technical Summary

Problems solved by technology

However, due to the short ventilation time and large valve overlap angle of the diesel engine in the two-stroke working mode, the airflow movement in the cylinder is more complicated, and it is more prone to problems such as uneven distribution of the mixed gas in the cylinder. In this mode, the combustion and work frequency of the engine is doubled, and the heat released in the cylinder per unit time is also greatly increased. If the piston combustion chamber applied to a four-stroke diesel engine is directly used in a two-stroke or four-stroke convertible diesel engine, it is easy to be too high. Thermal loads lead to piston ablation and cylinder failure

Images