Internal combustion engine aluminum piston with reinforced pin hole and preparation method of internal combustion engine aluminum piston

Abstract

The invention provides an internal combustion engine aluminum piston with a reinforced pin hole and a preparation method of the internal combustion engine aluminum piston. The internal combustion engine aluminum piston with the reinforced pin hole is characterized in that an aluminum-based ceramic fiber reinforcement ring (3) integrally formed with a piston body is embedded and cast in a piston pin hole (2) reserved in a piston pin seat (1), and the piston check mouth side of the aluminum-based ceramic fiber reinforcement ring (3) is provided with a positioning plane (4). According to the method, a pressure casting process is adopted, in the casting process, liquid aluminum alloy is immersed into a ceramic fiber sleeve prefabricated member for being combined with the ceramic fiber sleeve prefabricated member, so that the aluminum-based ceramic fiber reinforcement ring (3) which is made of aluminum-based ceramic fiber reinforced composite materials and integrally formed with the piston body is obtained. According to the internal combustion engine aluminum piston with the reinforced pin hole and the preparation method of the internal combustion engine aluminum piston, the high-temperature fatigue intensity of the piston pin hole reinforced by the ceramic fiber composite materials can be improved by 20%-30% compared with an ordinary pin hole, the linear expansion coefficient can be lowered by 20%, and the wear resistance can be twice that of the ordinary aluminum pin hole; the internal combustion engine aluminum piston has the advantage of being high in pin hole thermal fatigue strength compared with an ordinary aluminum piston.

Description

technical field [0001] An internal combustion engine aluminum piston with reinforced pinholes and a preparation method thereof belong to the technical field of engine pistons. Background technique [0002] At present, the diesel engines used in trucks, construction machinery, ships, etc. are constantly developing in the direction of high power and high load; the gasoline engines used in passenger cars such as cars and SUVs are also developing in the direction of high power and high speed. . The strengthening degree and explosion pressure of the engine are constantly increasing, and the emission requirements are becoming more and more stringent, which puts forward higher requirements for the key moving parts in the engine - the piston. As the heart of the engine, the piston is subjected to periodic heating of high-temperature gas and alternating high-pressure loads during work, and its working environment is very harsh. [0003] The pin seat on the upper side of the piston ...

AI Technical Summary

Problems solved by technology

[0007] In the present invention, an aluminum-based ceramic fiber reinforcement ring is inlaid and cast in the piston pin hole of the aluminum piston of the internal combustion engine, which is made of a ceramic fiber sleeve immersed in high-temperature liquid aluminum alloy under pressure. The liquid aluminum alloy is the casting liquid aluminum alloy of the piston body, so that the aluminum The base ceramic fiber reinforced ring is integrated with the piston body to solve the problem of traditional reinforced bush falling off

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