Novel integral aluminum piston assembly for internal combustion engine

Abstract

The invention provides a novel integral aluminum piston assembly for an internal combustion engine, and relates to the technical field of internal combustion engine pistons. The novel integral aluminum piston assembly for the internal combustion engine comprises an aluminum piston body, a connecting rod and a piston pin. According to the novel integral aluminum piston assembly for the internal combustion engine, engine oil is continuously supplied to the aluminum piston body through a connecting rod oil duct and a piston pin oil duct, then the integral aluminum piston body can be continuously cooled through oscillation of the engine oil in a cold oil cavity in the integral aluminum piston, the heat exchange efficiency is high, the cooling reliability is high, the cooling effect is good, the thermal load of the piston can be obviously reduced, the reliability of the piston is improved, and the service life of the piston is prolonged; and in addition, the engine oil can achieve forced lubrication on a piston pin hole, the piston pin and a connecting rod small-end bearing bush, the lubrication effect of the fit clearance is enhanced, and the failure risk of the piston pin hole, the piston pin and the connecting rod small-end bearing bush is reduced.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine pistons, in particular to a novel integral aluminum piston assembly for internal combustion engines. Background technique [0002] During the operation of the piston in the cylinder of the internal combustion engine, on the one hand, it is affected by the inertial force formed in the high-speed reciprocating motion; Relatively poor. Therefore, the material for making the piston should meet the special requirements of low density, light weight, good thermal conductivity, small thermal expansion coefficient, etc., and have good dimensional stability, good high temperature strength, good wear resistance and corrosion resistance, easy manufacturing and low cost. Low cost and other characteristics. Aluminum material is widely used in piston manufacturing because of its low density and good thermal conductivity. In addition to the material, the cooling of the piston needs to be ful...

AI Technical Summary

Problems solved by technology

The integral aluminum piston cooled by the fuel injection nozzle is prone to problems such as divergent oil beams and low oil capture rate during the fuel injection process, so the processing and installation requirements for the fuel nozzle are relatively high; In addition, the fuel injection nozzle The cooled integral aluminum piston generally has problems such as low heat transfer efficiency of the internal cooling oil chamber and poor cooling continuity.

Therefore, the overall aluminum piston cooled by the oil injection nozzle sometimes cannot achieve the expected cooling effect

In addition, an internal combustion engine with an integral aluminum piston cooled by fuel injection nozzles needs to process corresponding oil passages on its body and match corresponding nozzle assemblies, which will increase the manufacturing cost of the internal combustion engine and reduce production efficiency.

The integral aluminum piston cooled by oil injection at the small end of the connecting rod, the oil can be sprayed into the cooling oil chamber of the piston in less than one-third of a working cycle, the oil capture rate is low, and the continuous cooling of the piston cannot be realized. The cooling effect of the piston is worse than that of the oil nozzle cooling method

Integral aluminum piston cooled by oil injection nozzle and integral aluminum piston cooled by oil injection at the small end of the connecting rod. There is no forced lubrication in the pin hole. As the mechanical load and thermal load of the internal combustion engine become higher and higher, poor lubrication in the pin hole is prone to occur. Phenomena, resulting in abnormal wear of the pin hole, occlusion and other failures, so that the internal combustion engine cannot operate normally

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