Wear-preventive air-charger piston structure

A wear-preventive air-charger piston structure, the piston structure comprising a piston rod, a piston ring, and a top cover, the piston rod having a top that is formed with a piston top seat, the piston ring being disposed on the piston top seat, the piston top seat being covered with the top cover, such that the top cover and the piston top seat are securely fixed together,

• wherein the piston structure further comprises a buffering element, the buffering element being arranged between the piston top seat and the piston ring, the buffering element having an outside diameter that is smaller than an outside diameter of the piston ring, wherein when the piston ring is in an inclined oscillating condition and is at a high position of an oscillation side, the buffering element absorbs a stress applied to the piston ring at the high position of the oscillation side;
• wherein the buffering element is a plastic plate in the form of a hollow ring and has an inside surface in which a recess is formed, the recess forming a buffering space.