| 摘要 |
PROBLEM TO BE SOLVED: To provide a one-way type sealing device which can equip a piston ring, etc., with a high one-way sealing function. SOLUTION: In a circumferential groove 3a of a piston 3, a resilient ring 6 and a tension ring 7 are fitted, wherein the resilient ring 6 includes a peripheral part 6A provided with a fitting groove for fitting of seal rings 4 and 5 in slide contact with the wall surface of a cylinder 3, a coupling part 6B extending from one side of the peripheral part 6A along one-side side face of the groove 3a, and a bore part 6C extending from the coupling part 6B along the bottom surface of the groove 3a, while the tension ring 7 energizes the seal rings 4 and 5 toward the wall of the cylinder 3 while the peripheral part 6A of the resilient ring 6 is interposed. |
