Variable-compression-ratio mechanism of engine and air distribution system matched with variable-compression-ratio mechanism

Abstract

The invention discloses a variable-compression-ratio mechanism of an engine and an air distribution system matched with variable-compression-ratio mechanism. An inner cavity is formed in the center position of the top of an air cylinder cover to serve as a hydraulic cylinder barrel. A piston cover is fixed to the top of the hydraulic cylinder barrel, and a hydraulic cylinder inner sleeve is arranged at the bottom of the center of the piston cover. An annular piston body is arranged in the hydraulic cylinder barrel in a sealed and sleeved manner. An upper oil cavity and a lower oil cavity are formed in the upper end and the lower end of the piston body correspondingly and communicate with an oil inlet pipe and an oil outlet pipe correspondingly. A spark plug installation head is arranged at the bottom of the annular piston body and is fixedly connected with a spark head. The compression ratio of the variable-compression-ratio mechanism can be adjusted in a stepless manner; the engine adopting the variable-compression-ratio mechanism is suitable for multi-fuel driving; emission can be better reduced; running stability is improved; torque is improved; implementation is simple, convenient and feasible; and the construction cost is low.

Description

technical field [0001] The invention belongs to the technical field of variable engine compression ratio, and specifically relates to a mechanism with simplified structure, valve cooling function, and variable engine compression ratio according to working conditions, and an air distribution system matched with the mechanism. Background technique [0002] The compression ratio of the current automobile engine is generally fixed and not variable. Variable compression ratio gasoline engines can accept a variety of fuels, but fuels with higher octane numbers are better for the engine, because the higher the octane number, the less likely it is to trigger knocking, so that the engine can use higher compression Ratio operation, so as to obtain higher thermal efficiency and lower fuel consumption. [0003] Because of the variable compression ratio technology, it is more efficient to use the supercharging system, and there is no need to worry about problems such as knocking caused ...

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Problems solved by technology

[0007] However, the SVC engine has both advantages and disadvantages, that is, since the engine is divided into upper and lower parts, the upper cylinder also needs a cooling system, so the cooling system will become complicated, and the durability of the whole mechanism also needs to be verified. Before these problems were resolved, Saab went bankrupt

[0008] In 2005, the idea of ​​the variable compression ratio engine patent applied by Toyota Motor Corporation was similar to that of Saab. It was to manipulate the cylinder block. The cylinder block and the crankcase formed a variable compression ratio through relative axial movement, but the explosive force generated by the engine The control of the eccentric shaft will have a great impact, and the mechanism is also relatively complicated, so Toyota is only at the research stage

However, this solution is prone to sealing problems. In order to ensure that the auxiliary piston can work for a long time under high temperature and high pressure conditions, it must be cooled, and the unreasonable change of the combustion chamber layout will lead to a sharp increase in heat loss, which will reduce the thermal efficiency of the gasoline engine.

[0010] The above-mentioned methods all have one purpose - to make the compression ratio of the engine variable, but they all increase the difficulty of manufacturing parts and components to varying degrees, resulting in the great improvement of the engine volume and the shape of the combustion chamber, which affects the power, efficiency and many other issues

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