A Novel Integral Aluminum Piston Assembly for Internal Combustion Engines

Abstract

The invention provides a novel integral aluminum piston assembly for internal combustion engines, which relates to the technical field of pistons of internal combustion engines. This new integral aluminum piston assembly for internal combustion engines includes an aluminum piston body, connecting rod and piston pin. In the novel integral aluminum piston assembly for internal combustion engines of the present invention, the oil continuously supplies oil to the aluminum piston body through the connecting rod oil passage and the piston pin oil passage, and then through the oscillation of the oil in the cold oil cavity of the integral aluminum piston, the oil can be continuously The whole aluminum piston body is cooled with high heat exchange efficiency, high cooling reliability and good cooling effect, which can significantly reduce the thermal load of the piston and improve the reliability and service life of the piston. In addition, the oil can realize the forced lubrication of the piston pin hole, the piston pin and the small end bearing bush of the connecting rod, enhance the lubrication effect of the fitting clearance, and reduce the failure risk of the piston pin hole, the piston pin and the small end bearing bush of the connecting rod.

Description

technical field [0001] The present invention relates to the technical field of pistons of internal combustion engines, 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, high temperature strength, good wear and corrosion resistance, easy to manufacture and cost. low cost and so on. Aluminum 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 fully considered in the structural ...

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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