Sealing ring system, e.g. for pistons, comprises inner ring which presses sliding ring fitted over it against wall of cylinder, surface of sliding ring which faces cylinder wall is concave so that fluid can flow over it as piston moves

摘要

The sealing ring system, e.g. for pistons, comprises an inner ring (2) which presses a sliding ring (1) fitted over it against the wall (5) of a cylinder. The surface (4) of the sliding ring which faces the cylinder wall is concave so that fluid can flow over it as the piston moves.