Ablation-resistant bimetal combined piston ring, internal combustion engine and sealing method

Abstract

The invention discloses a bimetal combined piston ring, an internal combustion engine adopting same and a piston sealing method. Specifically, the bimetal combined piston ring comprises a metal firstpiston ring and a metal second piston ring; the cross section of a main body of the first piston ring is stepped; the stepped surface is positioned on the inner circumferential side of the first piston ring; the inner circumferential surface of the lower section of a step is a conical surface inclined inwards towards the vertical surface of the step by 15-75 DEG; the cross section of a main body of the second piston ring is stepped; the stepped surface is positioned on the outer circumferential side of the second piston ring; and the outer circumferential surface of an upper section of the step is an outer inclined conical surface complementary to the cone angle of the inner inclined conical surface of the first piston ring. By applying the piston ring, the dynamic property of the internalcombustion engine can be improved, and meanwhile, the wear rate of the piston ring is reduced, so that the service life of the ring is prolonged.

Description

technical field [0001] The invention relates to the field of design and manufacture of internal combustion engine parts, in particular to an ablation-resistant bimetal combined piston ring, an internal combustion engine and a sealing method. Background technique [0002] The piston ring is an important part in the combustion chamber of an internal combustion engine. It is an elastic metal ring assembled inside the piston ring groove. Through its own elastic force and the pressure of the gas in the cylinder, a seal is formed between the outer circle of the cylinder wall and the surface of the piston ring groove. , is the core component of the internal combustion engine combustion chamber. At present, there are mainly two types of piston rings: single type and combined type. Usually need to install 3-4 piston rings on a piston. [0003] The main functions of the piston ring mainly include the four major functions of sealing, oil control, heat transfer and support, which dire...

AI Technical Summary

Problems solved by technology

[0006] (1) Most of the existing combined piston rings do not seriously consider the sealing problem at the contact surface of the two rings, which causes the airflow to leak through the gap at the contact surface of the two rings, greatly reducing the sealing effect;

[0007] (2) When the piston runs to the upper part of the cylinder liner, it is difficult to lubricate and may be ablated and deformed, which not only increases the resistance, but also increases the wear rate of the piston and cylinder liner, reducing the service life of the piston ring;

[0008] (3) Most of the existing piston rings are single-piece piston rings, and the upper and lower parts are heated differently, which may easily lead to ring deformation and seal failure;

[0009] (4) In order to generate peripheral tension and to expand the piston during installation, a straight-through cut is provided in a part of the circumference, so there are inevitably problems of air leakage and oil leakage at the joint

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