Connecting rod lubrication oil delivery structure of diesel engine

Abstract

The invention discloses a connecting rod lubrication oil delivery structure of a diesel engine. A piston of the diesel engine is cooled by using lubrication oil and is provided with an inner oil cooling channel in the inside, two oil inlets communicated with the inner oil cooling channel are symmetrically formed in the top wall of the inner cavity of the piston, the piston is hinged to the small end of a connecting rod together, the small end of the connecting rod is located in the inner cavity of the piston, two asymmetrical oil feeding spray holes are formed in the top of the small end of the connecting rod, and at least one oil feeding spray hole is aligned to the oil inlets in all strokes of the piston behind an upper stop point. By the adoption of the connecting rod lubrication oil delivery structure, the cooling effect on the piston behind the upper stop point is enhanced by improving the conveying proportion of lubrication oil in front of the upper stop point to lubrication oil in back of the upper stop point, so that the piston meets the higher load requirement.

Description

technical field [0001] The invention relates to the field of diesel engine lubrication, in particular to a connecting rod lubricating oil delivery structure of a diesel engine. Background technique [0002] With the continuous improvement of modern diesel engines, in order to ensure the reliable and safe operation of diesel engines, pistons usually use internal cooling oil passages for enhanced cooling, and the lubricating oil required for piston internal cooling oil passages of medium and heavy-duty diesel engines is usually delivered to the piston through connecting rods. cavity way. Specifically, the machine body is provided with a lubricating oil passage leading to the main bearing cap, the main bearing bush is provided with a certain oil groove, and the main journal of the crankshaft and the connecting rod neck are provided with a communicating lubricating oil passage, so as to transport the lubricating oil transferred from the main bearing seat to the connecting rod ne...

AI Technical Summary

Problems solved by technology

[0003] However, in the above method of forced cooling through the connecting rod to the inner cavity of the piston, due to space and angle constraints, the oil inlet of the internal cooling oil passage located in the inner cavity of the piston cannot receive 100% lubricating oil during the entire stroke of the piston. , which makes it difficult for the piston to obtain a consistent cooling effect during a working cycle of the piston

Therefore, the application scope of the connecting rod oiling method is limited, and the power-up and explosion pressure level of the diesel engine using the connecting rod oiling method are limited.

In order to ensure the cooling effect of the piston, the process of the connecting rod delivering lubricating oil to the piston is mainly concentrated near the top dead center, that is, it presents a symmetrical distribution before and after the top dead center, and the cooling demand of the piston after the top dead center is much higher than that before the top dead center, which is symmetrically distributed The oil delivery method greatly reduces the cooling effect

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