A Hydraulic Adjustable Variable Compression Ratio Engine

Abstract

The invention discloses a hydraulic adjustment-type variable compression ratio engine, which comprises a cylinder body (11) and a crankcase (2) in which a crankshaft (1) is arranged; the crankshaft (1) is provided with a crank B (28) for converting thermal energy released by combustion of fuel gas in the cylinder body (11) into mechanical energy produced by rotation of the crankshaft (1); an intermediate body (3) is connected between the cylinder body (11) and the crankcase (2); a hydraulic system connecting the cylinder body (11) with the crankcase (2) is arranged in the intermediate body (3); the hydraulic system is connected with a hydraulic adjustment device; the crankshaft (1) is also provided with a crank A (26); and a hydraulic piston A (20) is driven through a connecting rod A (24) to act on the hydraulic system. The compression ratio of the engine can be adjusted according to changes of rotating speed and load; under a working condition of low speed and small load, thermal efficiency of a gasoline engine is improved by increasing the compression ratio; and under a working condition of high speed and heavy load, in-cylinder pressure and in-cylinder temperature are reduced by reducing the compression ratio, and the gasoline engine is protected from a phenomenon of detonation.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a hydraulically adjustable variable compression ratio engine, which can realize the change of the position of the piston at the top dead center of compression through the adjustment of the hydraulic system, and meet the requirements of the engine on the compression ratio under different working conditions . Background technique [0002] The engine compression ratio refers to the degree to which the gas in the cylinder is compressed when the piston moves from the bottom dead center to the top dead center. It is an important parameter to measure the performance of the engine and one of the most important factors affecting the efficiency of the engine. Generally, the higher the compression ratio, The better the performance. At present, the compression ratio of gasoline engines is generally 6-12, and that of diesel engines is generally 12-22. The thr...

AI Technical Summary

Problems solved by technology

The multi-link method increases the overall size of the engine, and the change in kinematics increases the inertial force, vibration and noise; at the same time, due to the increase in movable parts, the friction loss work increases accordingly, and the fuel economy decreases

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