Patent ID: 10774855

Abstract:
Provided is a hydraulic actuator with improved durability, the hydraulic actuator (10), having an actuator main body (100) constituted of a cylindrical tube (110) capable of expanding/contracting by hydraulic pressure and a cylindrical sleeve (120) formed by cords (121) woven to be disposed in predetermined directions, wherein: the average angle (Θ1) formed by the cords (121) with respect to the axis direction (DAX) of the actuator with no load and no pressure applied thereon is in a range of ≥20° and <45°; and in a state where the average angle (Θ3) formed by the cords (121) with respect to the axis direction (DAX) is 45° under hydraulic pressure of 5 MPa, a ratio (S2/S1) of the total area (S2) of clearances (122) between the cords (121) with respect to an area (S1) of an outer peripheral surface of the actuator main body (100) is 35% or less.