| 摘要 |
PROBLEM TO BE SOLVED: To provide a ring actuator with small and simple construction suitable for the thrust of a circular work. SOLUTION: This ring actuator 6 comprises a first ring member 21, a second ring member 22 and a communication passage 14. The second ring member 22 is arranged in combination with the first ring member 21. A driving fluid is supplied/discharged into/from a closed space formed between both ring members 21, 22 via the communication passage 14. With the supply/discharge of the driving fluid, both ring members 21, 22 are relatively moved along ring axial directions. |
