| 摘要 |
A dry-running piston assembly, e.g., for compressor pistons, in which the piston is slidable with slight clearance in a cylinder and is formed with at least one groove confronting the wall of the cylinder and receiving a wear-type (e.g., self-lubricating) piston ring. The piston ring is biased outwardly into contact with the wall of the cylinder and is provided with shoulders engageable with shoulders of the groove to prevent further outward displacement of the ring beyond a predetermined wear condition. The ring may be composed of polytetrafluoroethylene or another low-friction or self-lubricating material. |
