1. Overload fracture. After the new piston ring is loaded into the cylinder, it will run without running-in, overload, sink car impact load, and the piston ring will expand under impact, causing fracture.
2. Impact fracture. As the top of the cylinder wears to form a step, the piston ring breaks under the impact of the step.
3, the piston ring gap is too small fracture. After thermal expansion, the opening will die at the top, and the opposite side of the opening will be fractured.
4, ring groove carbon caused by piston ring fracture. Due to the hardening of the carbon deposit point in the ring groove, the piston is subjected to the axial alternating bending force, causing the piston ring to break.
5. The wear of the ring groove exceeds the limit, causing the piston ring to twist and deform and break in the ring groove. The piston ring is subjected to additional torsion during operation, and the bending stress will also cause the piston ring to break.
6, quality problems are broken. The piston ring material is poor, there is an air gap in the casting process, and the presence of sand holes will also cause the piston ring to break.
7. The damaged piston ring of the positioning pin is broken. For piston rings equipped with positioning pins (two-stroke diesel engines), if the positioning pins at the opening of the piston ring are damaged, the opening of the piston ring hanging in the intake and exhaust ports will also cause cylinder pulling or piston ring breakage.
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