Piston ring with good oil scraping function

Abstract

The invention provides a piston ring with a good oil scraping function. The piston ring is structurally characterized in that two symmetrical scraper blades are arranged on the outer circular face of the piston ring, the top end of each scraper blade is designed to be in a stepped shape, the minimum distance of each step is 0.01 mm, and the height of each step is 0.14 mm; a groove is formed in the inner circular face of the piston ring, and N small oil return holes evenly distributed are formed in the outer circular face of the piston ring; the shape structure of the top end of each scraper blade is in the stepped shape, and engine oil on the inner wall of a cylinder jacket can be effectively scrapped clearly; and the oil film thickness can be improved effectively and the friction work can be lowered effectively due to the small stepped area of the scraper blades, the width of the scraper blades cannot become larger suddenly even if the piston ring operates for a long time, and parts of the fine scraper blades are worn off. By the adoption of the structure, the deformation of the piston ring is small, the degree of fitting with the inner wall of the cylinder jacket is higher, a gap between the piston ring and the cylinder jacket is reduced, it is avoided that lubricating oil enters an air cylinder along the gap to be involved in combustion, and the emission level of an engine can be lowered effectively.

Description

technical field [0001] The invention belongs to the structural technology of an internal combustion engine, and in particular relates to a piston ring of the engine. Background technique [0002] With the gradual upgrading of national emission regulations, the emission level of engines is also increasing. Excessive oil consumption is also an important factor affecting engine emission levels. For example, the oil consumption rate is higher than the specified requirement, the main reason is that there is a problem with the oil-vapor separation system in the rocker arm chamber, which will make it difficult to meet the emission requirements. In addition, there are two ways of engine oil consumption, one is due to poor sealing between engine parts and leakage, the other is due to poor oil scraping effect of piston ring or poor effect of valve guide oil seal , Lubricating oil leaks into the cylinder to participate in combustion. The second situation will seriously affect the em...

AI Technical Summary

Problems solved by technology

For example, the oil consumption rate is higher than the specified requirement, the main reason is that there is a problem with the oil-vapor separation system in the rocker chamber, which will make it difficult to meet the emission requirements

In addition, there are two ways of engine oil consumption, one is due to poor sealing between engine parts and leakage, the other is due to poor oil scraping effect of piston ring or poor effect of valve guide oil seal , lubricating oil leaks into the cylinder to participate in combustion

The second case will seriously affect the emission level of the engine

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