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Piston Ring
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Identification and regulation of piston ring


The piston ring includes two kinds of gas ring and oil ring. The function of the air ring is to ensure the seal between the piston and the cylinder, prevent the high-temperature and high-pressure gas in the cylinder from leaking into the crankcase in large quantities, and at the same time transfer most of the heat from the top of the piston to the cylinder wall, and then be taken away by cooling water or air.

The oil ring is used to scrape off the excess oil on the cylinder wall, and a uniform oil film is coated on the cylinder wall, which can not only prevent the oil from entering the cylinder and burn, but also reduce the wear and lighten of the piston, piston ring and cylinder Friction resistance.

The working surface of the piston ring must not be scored, scratched, or peeled. The outer cylindrical surface and the upper and lower end surfaces should have a certain finish, the deviation of the curvature should not be greater than 0.02-0.04 mm, and the standard sinking amount of the ring in the groove should not exceed 0.15-0.25mm, the elasticity and clearance of the piston ring meet the regulations. In addition, the light leakage of the piston ring should also be checked, that is, the piston ring is placed flat in the cylinder, a small light bulb is placed under the piston ring, and a light shield is placed on top, and then the light leakage gap between the piston ring and the cylinder wall is observed. This shows whether the piston ring is in good contact with the cylinder wall. Under normal circumstances, the thickness of the light leakage gap of the piston ring should not exceed 0.03 mm when measured with a thick gauge. The length of the continuous light leakage slit should not be greater than 1/3 of the cylinder diameter, the length of several light leakage slits should not be greater than 1/3 of the cylinder diameter, and the total length of several light leakage slits should not exceed 1/2 of the cylinder diameter, otherwise, it should be replaced.

Piston ring marking GB/T 1149.1-94 stipulates: all piston rings that require installation direction should be marked on the upper side, that is, the side close to the combustion chamber. The rings marked on the upper side include: conical ring, inner chamfer, outer cut table ring, nose ring, wedge ring and oil ring requiring installation direction. The upper side of the ring is marked.