Split type pre-combustion chamber

Abstract

The invention provides a split type pre-combustion chamber. The split type pre-combustion chamber comprises a pre-combustion assembly, the pre-combustion assembly is arranged in a cylinder cover of an internal combustion engine, the pre-combustion assembly is arranged above a main combustion chamber and communicates with the main combustion chamber, the split type pre-combustion chamber further comprises an oil injection assembly, an ignition assembly and matching parts, the oil injection assembly and the ignition assembly are arranged above the pre-combustion assembly and communicate with the pre-combustion assembly, the matching parts are arranged between the pre-combustion assembly and the oil injection assembly, between the pre-combustion assembly and the ignition assembly and between the ignition assembly and the cylinder cover of the internal combustion engine correspondingly, and the matching parts seal and / or buffer the two components connected by the matching parts. According to the split type pre-combustion chamber, all the assemblies are connected more stably and reliably, and the problem that stress and looseness are generated due to different thermal expansion coefficients of a pre-combustion chamber body material and a cylinder cover material does not need to be worried about.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a split pre-combustion chamber. Background technique [0002] Experimental data shows that if you want to improve the thermal efficiency of a gasoline engine, you can use a slightly lean burn (the air-fuel ratio is between 1 and 1.5), but because the mild lean burn deviates from the theoretical air-fuel ratio, you cannot use a three-way catalytic converter. Only expensive NOx after-treatment equipment can meet the requirements of emission regulations; if ultra-lean combustion (air-fuel ratio greater than 1.5) is adopted, due to the high degree of air dilution, the combustion temperature is relatively low, which can improve the thermal efficiency of gasoline engines without causing excessively high NOx emissions, but due to the fuel characteristics of gasoline itself, it is difficult to compress and ignite like diesel, and it is also difficult for conventional ignition ...

AI Technical Summary

Problems solved by technology

[0004] However, although the pre-combustion chamber can achieve ultra-lean combustion, it needs to withstand high temperature, alternating pressure and alternating temperature during operation, so its related components need to adopt Made of special materials, due to the difference in thermal expansion coefficient between the special materials to be used and the cylinder head material, there is a risk of loosening or stressing the pre-combustion chamber components, resulting in reduced reliability

In addition, when the pre-combustion engine starts cold at low temperature, due to the large surface-to-volume ratio of the pre-combustion chamber and the rapid heat dissipation, ignition will become very difficult. How to ensure stable startup under low temperature conditions is also a problem that must be solved for pre-combustion engines

Images