Precombustion chamber structure for internal combustion engine

Abstract

The invention provides a precombustion chamber structure for an internal combustion engine. The precombustion chamber structure comprises a precombustion chamber cavity defined by a precombustion chamber top cover and a precombustion chamber side wall, the precombustion chamber cavity communicates with a main combustion chamber, the precombustion chamber cavity is connected with an ejector, the precombustion chamber structure further comprises multiple ignition electrodes, the ignition electrodes penetrate through the precombustion chamber top cover, and the portions, located in the precombustion chamber top cover, of the ignition electrodes are wrapped by insulators. One end of each ignition electrode is extended into the precombustion chamber cavity and forms a spark gap together with the side wall of the precombustion chamber side wall for forming spark. The precombustion chamber structure has the beneficial effects that the structure is simple and compact, the multiple ignition electrodes are integrated in the limited precombustion chamber space to replace an original spark plug, the combustion pressure in the precombustion chamber is changed by controlling the ignition phase difference of the multiple ignition electrodes, and therefore the ejection speed of flame in the precombustion chamber is adjusted.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a pre-combustion chamber structure for internal combustion engines. Background technique [0002] The internal combustion engine will emit nitrogen oxides NOx during operation, and the emission of NOx will increase with the increase of combustion temperature. To this end, the use of a leaner fuel mixture lowers the combustion temperature in the combustion chamber, thereby reducing the amount of NOx emitted. [0003] However, a fuel mixture that is too lean is likely to burn incompletely, making the spark plug less efficient at inducing combustion, and especially in large bore engines, it may take a relatively long time for the flame to spread throughout the combustion chamber. In order to reduce the occurrence probability of incomplete combustion, it is a feasible method to set up a pre-combustion chamber, and it is also the development direction of large-bor...

AI Technical Summary

Problems solved by technology

[0004] However, due to the limited space of the existing active pre-combustion chamber, generally only one spark plug can be installed, it is difficult to effectively control the speed of the flame jet in the pre-combustion chamber, and it cannot be well adapted to the working conditions of different engines.

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