A two-cylinder four-stroke hydraulic free-piston engine

Abstract

The invention provides a two-cylinder four-stroke hydraulic free piston engine. The two-cylinder four-stroke hydraulic free piston engine comprises hydraulic cylinders, internal combustion cylinders and a piston assembly, wherein the number of the hydraulic cylinders and the number of the internal combustion cylinders are respectively two, each internal combustion cylinder is provided with a combustion chamber, and each hydraulic cylinder is provided with a first inner chamber and a second inner chamber which are mutually connected; the piston assembly comprises two piston rods and a follower lever, each piston rod is provided with a hydraulic piston and a compression piston, the hydraulic piston divides the first inner chamber into a balance chamber and a pump chamber, and the compression piston divides the second inner chamber into compression chambers. By serially connecting the piston rods with the corresponding internal combustion cylinders, when the combustion chamber of one internal combustion cylinder conducts a compression and expansion stroke, the combustion chamber of the other internal combustion cylinder conducts exhaust and suction stroke, so that one piston rod installed in the internal combustion cylinder moves back and forth with the other piston rod under the drive of the follower lever only and the piston assembly is not subjected to the twisting moment effect in the entire process.

Description

technical field [0001] The invention relates to an engine, in particular to a two-cylinder four-stroke hydraulic free-piston engine with no torsion moment in the piston assembly. Background technique [0002] With the development of the global economy, the consumption of energy has intensified, and the resulting environmental problems have become increasingly prominent. Energy saving and environmental protection have become two major issues of global concern. The hydraulic free piston engine has a variable compression ratio and can achieve Flexible arrangement, which can improve fuel economy and reduce emission pollution, is a promising power star for walking machinery. [0003] After nearly 40 years of development, the hydraulic free piston engine has made unremitting efforts in many scholars and scientific research institutions, and has achieved certain results. The current hydraulic free piston engine is generally powered by a two-stroke internal combustion engine, but d...

AI Technical Summary

Problems solved by technology

The current hydraulic free piston engine is generally powered by a two-stroke internal combustion engine, but due to the large overlap between the intake process and the exhaust process of the two-stroke internal combustion engine, the discharge of exhaust gas is incomplete, the inflation coefficient is low, and the combustion of fuel is incomplete. , the discharge of pollutants exceeds the standard, so it is almost impossible to find it in the market except for some specific occasions.

There are also research institutions that use a two-cylinder four-stroke diesel engine as the power drive device of the hydraulic free-piston engine, but because the working process of the two combustion chambers is carried out alternately, and they only drive one hydraulic pump chamber, the axis of the hydraulic pump is between the two combustion chambers. In the middle position, when one of the combustion chambers is in the compression and expansion strokes, the other chamber is in the exhaust and suction strokes, that is, the force of one combustion chamber acting on the piston is much greater than that of the other combustion chamber. As far as the piston assembly is concerned, it will be subjected to a torsional moment, which increases the resistance when the piston moves, and reduces the movement frequency and output power of the engine.

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