Aluminium piston of IC engine and its casting method

Abstract

The invention discloses an aluminium piston of internal-combustion engine. Assembling part is made of aluminium alloy material inserted in head part, grooved part and upper part of pinhole seat of piston. The assembling part and piston are die cast as an integral part. The assembling part acts as a uniform contracting element that makes entities with larger thickness such as head part, grooved part and upper part of pinhole seat of piston delaminate or thinning down when die-casting. Thus the thickness of cross section of above said parts is close to the thickness of wall thickness of piston skirt so that when die-casting, each cross section of the integral piston is solidified nearly at same time. The characteristics of the casting method are that each piston is shaped by two times of die-casting i.e. first is to cast the uniform contracting elements, second is to cast integrated piston. The invented method has advantages of good heat conductivity, high integral strength, good wear-resistance, long service life, lower cost and high production efficiency.

Description

technical field [0001] The invention relates to an internal combustion engine (reciprocating) aluminum piston and a casting method. Background technique [0002] With the continuous improvement of the performance of internal combustion engines such as modern automobile engines, aluminum pistons have basically replaced cast iron pistons in their pistons, which has greatly improved the thermal conductivity and inertial load of the pistons. But in the past ten years, with the continuous strengthening of the engine, the aluminum piston of the internal combustion engine is subjected to an increasing thermal load, and the requirements for the thermal conductivity, thermal strength and wear resistance of the aluminum piston are getting higher and higher. However, the performance of the aluminum pistons in the prior art has not yet met the above requirements. In actual operation, sometimes the heat absorbed by the piston is too late to dissipate, which causes the thermal strength o...

AI Technical Summary

Problems solved by technology

In other words, apart from the squeeze-cast pistons mentioned above, the thermal conductivity, overall strength and wear resistance of aluminum pistons have not been greatly improved and improved so far.

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