| 摘要 |
The sealing device (1) for a piston (2) the fixed skirt (5) of which moves in a cylinder (8), comprises a sliding skirt (6) through which there passes axially a pressure-transmitting duct (10) and which is connected to the fixed skirt (5) by an inter-skirt mechanical connection (7) while an extendable continuous piston ring (9) is interposed in a sealed manner between said skirts (5, 6) and can come into contact with the cylinder (8) when the piston-ring internal cylindrical face (12) thereof is subjected to the pressure of a fluid (36) via the pressure-transmitting duct (10), a sliding-skirt spring (16) tending to bring said skirts (5, 6) together and to compress the extendable continuous piston ring (9) axially between said skirts (5, 6). |
