Piston ring set used for natural gas engine

Abstract

The invention discloses a piston ring set used for a natural gas engine, which comprises two gas rings and an oil ring, wherein the first gas ring is a double-ladder structure ring, the second gas ring is a detorsion structure ring, and the third oil ring is three pieces of flexible steel-belt combined oil rings; the embedded and molybdenum-spraying ring treatment is carried out on the surface ofthe first double-ladder structure ring, the molybdenum layer has strong scuffwear resistance capacity, and the double-ladder structure has strong deadlocking and carbon-deposition prevention capacities, thereby greatly prolonging the service life; the second gas ring adopts the detorsion structure and has extremely strong oil-scraping capacity as well as remarkably-reduced oil consumption and frictional work; the oil ring is formed by three pieces of flexible steel-belt combined oil rings, and three pieces of flexible steel-belt combined oil rings have the radial thickness of 3.7+ / -0.15, strong flexibility, light weight, strong deformation capacity complied with a cylinder sleeve, strong oil-return capacity, improved oil-scraping capacity and effectively-reduced oil consumption.

Description

technical field [0001] The invention relates to a piston ring set, in particular to a piston ring set for a natural gas engine. Background technique [0002] The piston rings of existing medium and heavy gas fuel engines, such as natural gas engines, directly follow the traditional form of piston rings for diesel or gasoline engines, that is, the first ring is a hard chrome-plated gas ring, and the second is a phosphating gas ring. , The third is composed of two combined spiral spring oil rings; but the use of this piston ring set in natural gas engines has the following disadvantages: [0003] (1) The hard chromium-plated air ring on the surface is difficult to adapt to the environment of high exhaust temperature and poor lubrication effect of gas fuel engines, and is prone to failure phenomena such as fusion wear and cylinder scuffing; [0004] (2) The two-combined spiral spring oil ring has long processing technology, low yield and large equipment investment; [0005] (...

AI Technical Summary

Problems solved by technology

[0003] (1) The hard chromium-plated air ring on the surface is difficult to adapt to the environment of high exhaust temperature and poor lubrication effect of gas fuel engines, and is prone to failure phenomena such as fusion wear and cylinder scuffing;

[0004] (2) The two-combined spiral spring oil ring has long processing technology, low yield and large equipment investment;

[0005] (3) The flexibility of the two-combined spiral spring oil ring is poor, and the cylinder liner has poor ability to adapt to deformation, which makes it difficult to meet the requirements of low oil consumption

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