Cam-driven hydraulic fully variably valve mechanism of internal combustion engine

Abstract

A cam-driven hydraulic fully variable valve mechanism of an internal combustion engine belongs to the technical field of engines. An inlet end of an oil tube III is arranged in an oil tank I, an outlet end of the oil tube is fixedly connected with an oil inlet hole I. The inlet end of the oil tube III is provided with a filter. An oil pump, an inlet end of an oil tube II and a check valve I are connected with the oil tube III in series. An overflow valve and an outlet end of an oil tube I are connected with the oil tube II in series. An outlet end of the oil tube II is arranged in the oil tank I. An inlet end of the oil tube I is fixedly connected with an oil drainage hole. The middle of the oil tube I is provided with a check valve II. The inlet end of an oil tube V is fixedly connected with an oil drainage hole II. The outlet end of the oil tube V is arranged in the oil tank II. An electro-hydraulic proportional valve is arranged adjacent to the inlet end of the oil tube V. The two ends of an oil tube IV are respectively communicated with a connecting hole and an oil inlet hole II of a tappet group. A check valve II is arranged in the middle of the oil tube IV. The cam-driven hydraulic fully variable valve mechanism of the internal combustion engine can realize continuous variable of valve lift and valve timing and throttle-free load control of a gasoline engine, reduce pumping loss, improve the volumetric efficiency, realize the Miller cycle, achieves the effect of energy saving and emission reduction, and is simple in structure and flexible in control.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a hydraulic fully variable valve mechanism of a cam-driven internal combustion engine. Background technique [0002] Due to the fixed structure of the traditional engine's valve mechanism, the valve timing cannot be changed during the operation of the engine. Usually, it can only ensure the performance of the internal combustion engine in a certain working condition, and it cannot take into account the requirements of various working conditions at the same time. It is difficult To achieve the real optimal valve timing. These fixed valve operating parameters are just a compromise of various comprehensive contradictions of internal combustion engine operation requirements for valve work under different operating conditions. Therefore, in order to meet the different valve timing requirements under different working conditions, improve the economy and power of the intern...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing variable valve mechanism, such as complex structure, large volume, and inability to flexibly control the valve lift and valve phase, and provide a simple and reliable structure, which can flexibly control the valve lift and valve phase. cam-driven internal combustion engine hydraulic fully variable valve train

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