Rolling Piston Ring Structure for Low-Friction Cylinder Sealing

The patent replaces the conventional sliding friction mechanism with a rolling friction mechanism by introducing rolling elements (balls or rollers) between the piston ring and cylinder wall. This substitution transforms the sliding contact into rolling contact, reducing friction coefficients from typically 0.1-0.5 to 0.001-0.01, thereby dramatically reducing energy loss while maintaining sealing through the rolling elements.

The patent changes the fundamental friction parameter from sliding to rolling by modifying the contact mechanism. The piston ring is equipped with rolling elements that change the nature of interaction with the cylinder wall, transforming high-friction sliding contact into low-friction rolling contact, thus reducing energy loss while preserving sealing capability.

The patent makes the piston ring structure dynamic by incorporating rolling elements that can move and adjust their position. The rolling elements are free to rotate and reposition themselves, allowing the sealing structure to dynamically adapt to thermal expansion and contraction of the piston and cylinder, thereby maintaining sealing reliability under varying temperature conditions while preserving the low-friction rolling contact.

The rolling elements serve dual functions automatically: they provide low-friction rolling contact for energy efficiency while simultaneously adapting their position and orientation to maintain sealing during thermal cycles. The structure self-adjusts without external intervention, with the rolling elements naturally accommodating expansion and contraction through their rotational and positional freedom.