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    • 9. 发明公开
    • HYDRAULIC ACTUATOR
    • EP4450829A1
    • 2024-10-23
    • EP22906982.8
    • 2022-10-11
    • BRIDGESTONE CORPORATION
    • OONO, Shingo
    • F15B15/10
    • F15B15/10
    • A hydraulic actuator (10) includes a tube (20) capable of being expanded and contracted by fluid pressure, a sleeve (30) that is a structural member made of woven fiber cords (31) directed in predetermined directions (θ1) to exert stretchability and covers an outer circumferential surface of the tube (20), a sealing member (40) that seals each end (21) of the tube (20) in an axial direction thereof (XA), and a restraint member (50) that is provided at a part of a circumference of the tube (20) to extend from one end to another end of the tube (20) in the axial direction (XA) and restraints an elongation of the part of the circumference of the tube (20) in the axial direction (XA). The predetermined directions (θ1) in which the fiber cords (31) of the sleeve (30) are directed are oriented such that the tube (20) elongates when expanded. The restraint member (50) is woven into the sleeve (30) to be integrated therewith, or disposed between the sleeve (30) and the tube (20).