The piston ring is a kind of metal elastic ring with large outward expansion deformation, which is assembled in the profile and its corresponding annular groove. Reciprocating and rotating piston rings rely on the pressure difference of gas or liquid to form a seal between the outer circle of the ring and the cylinder and one side of the ring and the ring groove.
The force acting on the piston ring is the gas pressure, the ring's own elastic force, the inertia force of the ring reciprocating motion, the friction between the ring and the cylinder and the ring groove. Due to the action of these forces, the ring will produce axial motion, radial motion, rotary motion and other basic motions. In addition, due to its movement characteristics, accompanied by irregular movement, the piston ring inevitably appears suspension and axial vibration, radial irregular movement and vibration, twisting movement caused by axial irregular movement. These irregular movements often prevent the piston ring from functioning. When designing the piston ring, it is necessary to give full play to the favorable movement and control the unfavorable side.
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