Adaptive variable compression engine piston

Abstract

The invention provides an adaptive variable compression engine piston, relating to an engine piston. The invention is characterized in that the piston is composed of a gas mixture combustion pressure control piston lifting system, an oil filling system and a cooling system, wherein the gas mixture combustion pressure control piston lifting system comprises an upper oil chamber (4) consisting of apiston shell (1) and an upper oil pressure piston (2) and a lower oil chamber (28) consisting of the piston shell (1) and a lower oil pressure piston (17); the oil filling system comprises a connecting rod internal oil duct (22), a connecting rod small end oil groove (21), a piston pin internal oil duct (25), a piston lower support internal oil groove (27) and an oil filling check valve (16); thecooling system comprises the connecting rod internal oil duct (22), the connecting rod small end oil groove (21) which is communicated with the piston pin internal oil duct (25) and a cooling oil spray hole (24), and a cooling oil duct (8). The piston can be automatically adapted to the compression ratios of the engine under different working conditions and can greatly enhance gas mixture combustion efficiency and torque under medium and low loads.

Description

technical field [0001] The invention relates to an engine piston, in particular to an adaptive variable compression ratio engine piston. Background technique [0002] Increasing the compression ratio can greatly improve the efficiency and power of the engine. Generally, the compression ratio of the engine is set with reference to the full throttle valve, that is, the maximum intake air volume and cannot be changed, and the vehicle generally works at low and medium loads most of the time. At this time, the throttle valve opening is small, and the mixture gas entering the cylinder is less. At the end of compression, the mixture gas density has not reached the set value, making the combustion efficiency low. The corresponding compression ratio can greatly improve the combustion efficiency of the engine and save fuel. In order to enable modern engines to exert better efficiency in various changing working conditions, many units have developed variable compression ratio engine t...

AI Technical Summary

Problems solved by technology

It has the disadvantages of heavy weight, and at different speeds, due to the influence of piston inertia, the spring preload force cannot be well matched with the combustion pressure of the mixture, and the required compression ratio cannot be achieved, and the top of the piston is difficult to dissipate heat and difficult to implement.

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