What are the main contents of piston ring performance inspection?
1 Answers
Piston ring performance inspection mainly includes checking the elasticity of the piston ring, checking the warpage of the piston ring, and checking the light leakage of the piston ring. Check the elasticity of the piston ring. The elasticity of the piston ring should be appropriate, neither too large nor too small. Use a standard ring as a reference: place the ring to be inspected and the standard ring vertically, then apply pressure from above and observe the opening state of the two rings. If they meet simultaneously (or the opening degree is consistent), the tested ring is in good technical condition; if the opening of the tested ring is smaller than that of the standard ring (or closes prematurely), the elasticity of the tested ring is too small and it cannot be used further; if the opening of the tested ring is larger than that of the standard ring, it indicates that the elasticity of the tested ring is too large. Check the warpage of the piston ring. The warpage should not exceed 0.02-0.04 mm. Check the light leakage of the piston ring. Place the piston ring flat in the cylinder, place a small light source underneath, and a light shield on top, then observe the light leakage gap between the piston ring and the cylinder wall. Generally, the light leakage gap measured with a feeler gauge should not exceed 0.03 mm; the length of continuous light leakage should not exceed 1/3 of the cylinder diameter; the total length of light leakage gaps should be less than 1/2 of the cylinder diameter. Piston ring clearance includes the piston ring end gap, side gap, and back gap. The measurement methods are as follows: for the end gap, place the piston ring in a standard cylinder liner, keep it flat, and then measure with a feeler gauge. For the side gap, place the piston ring in the piston ring groove and measure with a feeler gauge.
