Engine piston ring containing carbon fiber composite layer

Abstract

The invention discloses an engine piston ring containing a carbon fiber composite layer. The engine piston ring comprises a piston ring body, the piston ring body is wrapped with the carbon fiber composite layer, the carbon fiber composite layer comprises a porous metal layer and a carbon fiber layer, the carbon fiber composite layer is in seamless connection with the piston ring in an extrusion manner, and the surface of the porous metal layer does not make contact with an air cylinder; the carbon fiber composite layer is tightly combined with the piston ring body, the serial problems of uneven loads and uneven heat generated by abnormal work of an engine can be solved, the reaction time of the piston ring for heat and load different motion changes is prolonged, heat stress and shape change tendency is reduced, pressure stabilizing and heat stabilizing effects re achieved, and the work period of the piston ring is finally prolonged; the carbon fiber layer has the beneficial effects of being high in strength, high in modulus and the like, the carbon fiber layer can be coordinated with the porous metal layer, the carbon fiber composite layer can better achieve the pressure stabilizing and heat stabilizing effects, and structural stability and safety of the piston ring are effectively improved.

Description

technical field [0001] The invention relates to the field of engine piston parts, in particular to an engine piston ring containing a carbon fiber composite layer. Background technique [0002] With market demands for extending the life of automobile engines and improving fuel efficiency, piston rings used in engines are required to be small in width, light in weight, low in tension, and low in friction loss. Piston rings are installed on the pistons for smooth reciprocating movement of the pistons in the cylinders and for sealing high-temperature combustion gases. The piston on which the piston ring is attached forms a combustion chamber in the cylinder, and the explosion pressure generated by the combustion of fuel in the combustion chamber is converted into the rotation of the crankshaft. Therefore, the piston ring attached to the piston is required to have the function of being able to withstand the explosion impact in the combustion chamber and stably sealing the high-...

AI Technical Summary

Problems solved by technology

[0003] The forms of early failure of piston rings are mainly divided into five types: biased wear, transitional wear, working surface abrasion, fracture, and ring sticking. The way and installation method are incorrect, the end face of the oil ring is uneven or the thickness is uneven. Under the uneven thermal shock force from the cylinder, the mechanical vibration force of the cylinder and the instantaneous heat flow from the cylinder, thermal stress and deformation tend to occur on the piston ring due to uneven load and uneven heat (uneven heat causes the local overheating area of ​​the piston ring The coefficient of thermal expansion is not consistent with the surrounding area), especially when the engine is working abnormally in a short time, that is, when the engine is overloaded and overheated instantaneously, the thermal stress becomes larger, and the deformation trend further develops to make the piston ring slightly deformed. In this long-term working environment , causing the piston ring to break due to deformation, or abnormal wear, thus causing the piston ring to fail prematurely

Although these problems are less likely to occur and have little impact, there are still hidden dangers to the safety of the engine. Because these problems have not been paid enough attention to, the structural stability and safety of the existing piston rings are not ideal, and their working cycles are slow. less than expected

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