Piston rings are metal rings inserted into the groove of the piston. There are two types of piston rings: compression rings and oil rings.The compression ring can be used to seal the combustible mixture of gases in the combustion chamber.An oil ring is used to scrape excess oil off the cylinder.
Piston ring is a kind of metal elastic ring with large outward expansion deformation, which is assembled into the section and its corresponding ring groove.Reciprocating and rotating piston rings, depending on the pressure difference between the gas or liquid, form a seal between the outer ring surface and the cylinder and between the ring and one side of the ring groove.
Good versus bad
The piston ring working surface shall not have scratches, scratches, peeling, the outer cylinder surface and the upper and lower end face should have a fixed degree of smoothness, the deviation should not be greater than 0.02 -- 0.04 mm, the ring in the groove of the standard sink shall not exceed 0.15-0.25 mm, the piston ring's elasticity, clearance in accordance with the provisions.In addition, it is also necessary to check the light leakage of the piston ring, that is, put the piston ring flat in the cylinder, put a small light bulb below the piston ring, put a mask above, and then observe the light leakage gap between the piston ring and the cylinder wall, so as to know whether the piston ring and the cylinder wall are in good contact.In general, the piston ring leakage with a thickness gauge shall not exceed 0.03 mm.The length of continuous light leakage cracks should not be greater than 1/3 of the diameter of the cylinder, the length of some light leakage cracks should not be greater than 1/3 of the diameter of the cylinder, the total length of some light leakage should not exceed 1/2 of the diameter of the cylinder, otherwise, it should be replaced.
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