A New Type of Compression Ratio Piston Connecting Rod Assembly

Abstract

The invention discloses a piston-and-connecting-rod assembly adopting a novel compression ratio. The assembly comprises a piston, a guide wheel, fastening springs, a hydraulic cover plate, a hydraulic stator, a hydraulic rotor, a spline and the like and is characterized in that the hydraulic stator is located in a cavity in a lower piston body; the hydraulic rotor is mounted in the middle of the hydraulic stator and can rotate around the hydraulic stator; the hydraulic cover plate fixes the hydraulic stator to the lower piston body by the aid of bolts; oil grooves in the hydraulic rotor make contact with oil grooves in the bottom of the cavity of the lower piston body; the hydraulic rotor is connected with the guide wheel by the aid of the spline; a guide plate of an upper piston body is placed on the lower piston body; and the upper piston body is connected with the lower piston body by the aid of the fastening springs. The hydraulic rotor is driven by oil pressure to rotate to enable the guide wheel to rotate, and a spiral bulge of the guide wheel makes contact with a spiral bulge of the upper piston body, so that the relative displacement of the upper piston body and the lower piston body is changed, and the compression ratio of an engine is changed.

Description

technical field [0001] The invention relates to a vehicle engine component, in particular to a novel compression ratio piston connecting rod assembly. Background technique [0002] The compression ratio is an important performance parameter of the internal combustion engine. From the thermodynamic performance, the compression ratio will directly determine the thermal efficiency and emission of the power machinery. The higher cylinder pressure and temperature provided by the high compression ratio at the beginning of combustion help to obtain a higher flame propagation speed. At the same time, the high compression ratio will reduce the exhaust gas residue and also improve combustion, so the delay period becomes shorter In other words, a higher compression ratio is used at low loads to shorten the combustion duration and increase thermal efficiency, which can significantly improve the fuel economy of the engine. At the same time, due to the improvement of in-cylinder combusti...

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Problems solved by technology

[0004] However, an excessively high compression ratio will bring negative effects. For gasoline engines, it will cause deflagration, and for diesel engines, it will make its work rougher, and the noise and vibration will increase. The impact load on components will increase, which will affect the continuous operation of diesel engines. Life and Reliability

[0005] The variable compression ratio technology is to adjust the engine compression ratio flexibly by detecting the internal combustion engine load, fuel oil and working environment, so as to increase the output power of the engine and reduce the generation of knocking. The technical solution has the problems of complex mechanical structure, large changes to the overall engine, cylinder scuffing caused by unsatisfactory dynamic balance, difficulty in development, and high research and development costs, which makes the overall variable compression ratio engine not so practical that it can be Variable compression ratio engines are still a long way from mass production

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