Connecting Rod Lubricating Oil Delivery Structure of Diesel Engine

Abstract

The invention discloses a connecting rod lubricating oil conveying structure of a diesel engine. The lubricating oil cools the piston of the diesel engine. The inside of the piston has an internal cooling oil passage, and the top wall of the inner cavity of the piston is symmetrically arranged with the internal cooling oil passage. Two connected oil inlets, the piston and the small head of the connecting rod are hinged together. At least one oil injection hole is aligned with the oil inlet in the whole stroke after the top dead center. The connecting rod lubricating oil delivery structure enhances the cooling effect on the piston after the top dead center by improving the ratio of lubricating oil delivery before and after the top dead center, so that the piston can adapt to higher load requirements.

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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