| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive mechanism not using a slide part seal requiring periodical replacement in a submerged robot and the like. SOLUTION: An electrical wire penetration part 25 in which an electrical wire 26 for electric power supply and the transfer of a control signal to the inside of an airtight chamber is electrically insulated and penetrates an end plate in a state that pressure resistance and airtightness for withstanding a pressure difference between an inside and an outside is provided in a linear motion mechanism unit 10 having a linear motion mechanism element 11 comprising a spiral screw shaft 20, a female screw (motor rotor) 21, and a motor stator 22 built in an airtight chamber 40 comprising an end plate A23, an end plate B23a, and a stretchable cylindrical film member 30, and the airtight chamber is filled with liquid 50 having an electrical insulation property. Consequently, an expansion and contraction actuator suitable to used underwater or under the sea is provided. COPYRIGHT: (C)2009,JPO&INPIT
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