Engine crankshaft mechanism capable of changing compression ratio

Abstract

The invention discloses an engine crankshaft mechanism capable of changing a compression ratio. The engine crankshaft mechanism comprises crankshaft pairs and main shaft necks, wherein each crankshaft pair is installed between two adjacent main shaft necks, the upper end of each crankshaft pair is provided with a crankshaft pin which is assembled with an engine piston. The engine crankshaft mechanism is characterized by also comprising an electric control mechanism, wherein a slide crankshaft in the crankshaft pair is matched with the main shaft neck in a sliding manner, a longitudinal drawing bar in the electric control mechanism is hinged to a crankshaft bearing at the outer side of the slide crankshaft in the crankshaft pair, and the slide crankshaft is driven by the longitudinal drawing bar to slide inwards or outwards on the main shaft neck, so that the distance between the movable crankshaft pin and the main shaft neck is changed. An upper stop point and a lower stop point of the piston installed on the crankshaft pin are adjusted by adjusting the distance between the crankshaft pin and the main shaft neck by virtue of the electric control mechanism, so that a purpose of adjusting the compression ratio is realized, the adaptability of an engine to the fuel oil is improved, and the economic scale of the operation of the engine can be enlarged.

Description

technical field [0001] The invention relates to the field of automobile engines, in particular to an engine crankshaft mechanism with variable compression ratio. technical background [0002] Before the battery life and charging problems of electric vehicles are completely solved, the internal combustion engine for vehicles will continue to be the main power source of vehicles for a long time. At present, as the world pays more and more attention to environmental protection, laws and regulations related to automobile environmental protection are gradually tightened. Take my country's "Light Vehicle Pollutant Emission Limits and Measurement Methods (China's Fifth Stage)" (hereinafter referred to as the National Five Standards) and "Light Vehicle Pollutant Emission Limits and Measurement Methods (China's China III and IV Stages)" (hereinafter referred to as the National IV Standard) comparison as an example. In the National V standard, the emission requirements of nitrogen ox...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor vehicle adaptability and narrow economic working condition area caused by the invariable compression ratio of the existing engine; it also needs to make great changes to the existing engine to solve the complex structure of the existing variable compression ratio engine The problem of realization provides a kind of engine crankshaft mechanism of variable compression ratio, and the technical scheme adopted in the present invention is:

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