Piston ring of internal combustion engine and internal combustion engine provided with piston ring

Abstract

The invention relates to a piston ring of an internal combustion engine and the internal combustion engine provided with the piston ring, and belongs to the field of internal combustion engine research. The piston ring comprises a piston ring outer surface, a piston ring upper end face and a piston ring lower end face. A plurality of micro pit structures of different depths are machined in the piston ring outer surface. The depths of the micro pit structures have a gradual decrease trend from the piston ring upper end face to the piston ring lower end face. The micro pit structures are formed in the piston ring outer surface, and because the depths of the micro pit structures have the gradual decrease trend from the piston ring upper end face to the piston ring lower end face, the oil storage sizes of the micro pit structures are accordingly reduced, a wedge-shaped effect is achieved, lubricating oil overflows and is squeezed to form certain oil pressure after flowing into the pit, with the small depth, close to the piston ring lower end face, the oil film thickness is increased, the rough peak contact between two surfaces of a kinematic pair is reduced, and friction and abrasion are effectively reduced. The piston ring is novel in structure, the lubrication condition of a cylinder sleeve and the piston ring of the internal combustion engine is effectively improved, the abrasion amount and the friction power consumption are decreased, and the service life of the piston ring is prolonged.

Description

technical field [0001] The invention belongs to the field of internal combustion engine research, in particular to a piston ring of an internal combustion engine and an internal combustion engine equipped with the piston ring. Background technique [0002] In recent decades, the development of internal combustion engines has mainly focused on the control of harmful emissions and low-carbon energy-saving technologies. The cylinder liner piston ring system of the engine needs to meet the strict requirements of energy conservation and emission reduction; at the same time, various advanced combustion and emission control technologies will gradually be used in engines. With the emergence and continuous application in the world, the engine is increasingly showing a trend of small size, high strength, high power density and light weight. The application of these advanced technologies makes the key lubrication and friction pairs of the cylinder liner and piston ring of the internal c...

AI Technical Summary

Problems solved by technology

[0005] However, in the internal combustion engine, the piston assembly is constantly changing from low speed to high speed, light load to heavy load, which makes the friction and wear of the cylinder liner-piston ring pair particularly prominent under extreme service conditions.

Although the micro-dimple structure with uniform depth can alleviate the friction and wear problem to a certain extent, it cannot obtain the best friction performance of the piston ring-cylinder liner pair under the condition of alternating load of the internal combustion engine.

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