Opposite-piston, two-stroke and variable-compression-ratio type gasoline engine

Abstract

The invention discloses an opposite-piston, two-stroke and variable-compression-ratio type gasoline engine, and relates to the field of internal combustion engines. The gasoline engine comprises a cylinder body, a gear synchronizing mechanism, a first spark plug, a second spark plug, a gasoline injector and a motor, wherein the cylinder body is connected with the gear synchronizing mechanism through a crankshaft; the first spark plug, the second spark plug and the gasoline injector are arranged on the outer circumferential wall of the cylinder body; the gear synchronizing mechanism provided with a gas feeding side gear and a gas exhausting side gear is connected to the motor; the gas feeding side gear is connected with a gas feeding side crankshaft; the gas exhausting side gear is connected with a gas exhausting side crankshaft; at least two intermediate gears are arranged between the gas feeding side gear and the gas exhausting side gear; the gas feeding side gear, the intermediate gears and the gas exhausting side gear which are engaged with each other are connected through connecting plates. According to the opposite-piston, two-stroke and variable-compression-ratio type gasoline engine, the movement phase difference of opposite pistons can be changed through the gear synchronizing mechanism, so that the cylinder working capacity can be changed when the opposite pistons are positioned at inner stopping points and outer stopping points, and as a result, the compression ratio of the gasoline engine in working can be varied.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an opposed-piston two-stroke gasoline engine with variable compression ratio. Background technique [0002] The advent of the internal combustion engine has experienced more than 100 years of development. The modern internal combustion engine is not what it used to be in terms of structure and performance, but it is still developing and improving. The current development of the internal combustion engine industry is mainly centered on energy saving, fully taking into account the requirements of emissions and reliability, so as to achieve an overall improvement in the performance of internal combustion engines. Petroleum fuel consumed by internal combustion engines accounts for more than 60% of the total petroleum consumption, and almost 50% of CO, HC and NOx emissions from burning fossil fuels come from internal combustion engines. Therefore, on the premise o...

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Problems solved by technology

[0003] For gasoline engines, in order to improve cycle thermal efficiency and reduce fuel consumption, it is necessary to greatly increase the compression ratio of internal combustion engines, but the knock problem has become an insurmountable obstacle

The output power of the whole machine increases with the increase of the compression ratio, but if the compression ratio is too high, there will be knocking in the cylinder, resulting in a decrease in power output and an increase in mechanical load and thermal load. Therefore, the compression ratio needs to be adjusted according to the change of the speed and load

The traditional variable compression ratio design schemes mainly include: cylinder head and cylinder block movement scheme, combustion chamber shape change scheme, piston compression height change scheme, crankshaft position change scheme and connecting rod effective length change scheme, but in the process of engineering practice, some Design bottlenecks often restrict the realization of variable compression ratios, so traditional mechanical design methods are difficult to achieve variable compression ratios

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