ACTUATOR

摘要

PROBLEM TO BE SOLVED: To provide an actuator allowing a reduction in size and weight and also a reducing in production cost by simplifying the structure of a moving body displacing along a flexible tube member to reduce the number of part items. SOLUTION: This actuator comprises a packing 30 in slidable contact with the inside wall surface of the flexible tube member 12, an internal moving body 16 displacing along a through-hole 14 of the flexible tube member 12 under the action of pressure fluid, and an external arresting body 20 installed so as to surround the outer peripheral surface of the flexible tube member 12 and sealing a clearance thereof from the packing 30 by pressing the flexible tube member 12 in the radial outer direction.