Step booster exhaust valve

Abstract

The object of the present invention is to provide a step-by-step booster exhaust valve, including an exhaust valve seat, an exhaust valve return spring, an exhaust valve return spring seat, an exhaust valve stem, an exhaust valve hydraulic piston, a pressurization chamber, a hydraulic The plunger, the secondary piston, the primary piston, the servo oil through hole and the hydraulic cavity, the hydraulic cavity is formed between the primary piston and the exhaust valve body, the hydraulic cavity is connected with the high-pressure servo oil pipe through the servo oil inlet, the primary piston is connected with the The two-stage pistons are connected, and there is a servo oil through hole on the first-stage piston. The hydraulic plunger is closely connected with the second-stage piston due to the hydraulic pressure of the servo oil in the pressurization chamber, and a pressurization is formed between the hydraulic plunger and the hydraulic piston of the exhaust valve. The pressurization chamber is connected with the servo oil tank through the servo oil suction check valve, and the lower end of the hydraulic piston of the exhaust valve is closely connected with the exhaust valve stem. The invention has a large degree of freedom in the control of the exhaust valve, can flexibly control the exhaust timing and duration angle, can realize the variable lift of the exhaust valve, and can further improve the emission of the internal combustion engine and the fuel economy.

Description

technical field [0001] The invention relates to an engine, in particular to an exhaust valve of the engine. Background technique [0002] During the working process of the internal combustion engine, every time a working cycle is completed, the exhaust gas must be discharged from the cylinder, and the fresh air must be sucked into the cylinder. The intake and exhaust process must be carried out in strict accordance with the timing requirements of the internal combustion engine. The ignition sequence is carried out to ensure that the internal combustion engine operates under optimal conditions. The exhaust valve is one of the important parts of the exhaust system of the internal combustion engine. Its main function is to discharge the burned exhaust gas out of the combustion chamber within a specified time. have a great impact. The opening and closing time and action rules of the exhaust valve of the existing internal combustion engine are mostly controlled by the cam insta...

AI Technical Summary

Problems solved by technology

The opening and closing time and action rules of the exhaust valve of the existing internal combustion engine are mostly controlled by the cam installed on the camshaft in the timing gear system of the valve train through a set of transmission mechanisms. The cam is easy to wear and tear, and the mechanical transmission mechanism Disadvantages such as high working noise and high machining accuracy requirements, invariable exhaust phase and valve lift, and poor control accuracy

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