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Piston ring is used to lodge in the slotting auger. It is divided into two kinds: compression ring and oil rings. Compression ring can be used to seal the combustion chamber compressed air; Oil ring is used to shave their excess oil cylinder. Piston ring is one kind of metal elastic deformation which has the larger outward expansion of metal elastic deformation; it is assembled into a ring with the corresponding circular section slots. The piston rings of reciprocating and rotational motion, relying on the pressure difference of gas or liquid to form ring groove in the round face and cylinder ring between a lateral sealing. Stroke piston ring, is a piston ring which has 2-stroke.