Asymmetric doctor blade ring and three-combination piston oil ring and manufacture method of doctor blade ring

Abstract

The invention discloses an asymmetric doctor blade ring and three-combination piston oil ring and a manufacture method of a doctor blade ring. The asymmetric doctor blade ring and three-combination piston oil ring comprises a bushing ring body, two doctor blade ring base bodies, a piston and a cylinder sleeve, the excircle face of each doctor blade ring base body is of an asymmetric barrel face structure, the oil distribution area of the upper side of the excircle is increased, the oil storage amount is increased, and the thickness and uniformity of an oil film on a cylinder wall are increased. The lubricating condition is improved, the frictional wear between the ring and the cylinder wall is reduced, the friction faces of the ring and the cylinder sleeve are protected, and the friction noise is reduced. The oil distribution area is small when a doctor blade moves downwards, and therefore the thickness of an oil film on the surface of the cylinder sleeve is reduced, residual lubricating oil is reduced, and engine oil consumption of an engine is further reduced. By increasing the contact surface of the circular arc of the inner circular surface of the doctor blade ring and a bushing ring, the contact face pressure is reduced, and the abrasion of the bushing ring is effectively improved. By reducing the circular arc of the outer circular surface of the doctor blade ring, the contact face between the ring and the cylinder wall is reduced, the contact face pressure is increased, the oil scraping effect of the doctor blade ring is improved, and a positive effect on improving the oil consumption of the engine is achieved.

Description

technical field [0001] The invention relates to the technical field of piston rings, in particular to an asymmetric scraper ring, a three-combination piston oil ring and a preparation method of the scraper ring. Background technique [0002] The three-combination oil ring has the characteristics of superior side sealing and lightweight design, and is widely used, especially in high-speed engines such as gasoline engines and gas engines, becoming the mainstream design. [0003] The three-combination piston ring oil ring is composed of an upper and a lower pair of scraper rings and an intermediate lining ring. The intermediate lining ring provides outward tension to the scraper ring, so that the outer circle of the scraper ring and the cylinder wall always maintain a high degree of fit. When moving up and down, it has the function of scraping oil on the cylinder wall. The oil ring moves up and down with the reciprocating movement of the piston, the inner surface of the scrape...

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Problems solved by technology

With the increase of automobile explosion pressure and the improvement of friction requirements, this kind of scraper ring has the following disadvantages: 1) The outer circular surface of the common scraper ring is a symmetrical semicircular structure, and the upward oil distribution of the scraper ring The surface is symmetrical to the downward oil scraping surface. Since the scraper ring is very thin (generally 0.3-0.6mm), this makes the oil distribution surface very small, and the thickness uniformity of the lubricating oil film formed on the cylinder wall is poor. Point, the thinner the oil film, or even the phenomenon of no oil film, will affect the lubrication effect, which will easily cause the wear of the scraper ring and the cylinder liner and the risk of cylinder scuffing; The excessive wear of the ear of the lining ring is caused. After the ear of the lining ring is worn, the combined tension of the ring will decrease, which will affect the oil scraping effect, and it needs to be polished to reduce the roughness during production, and the waste generated during grinding Chips are often raised, affecting the operation and health of workers

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