| 摘要 |
<P>PROBLEM TO BE SOLVED: To bring a propulsion mechanism into reliable contact with a duct wall, to surely transfer just a propulsion force to the duct wall without transferring an unnecessary retraction operation and to reduce the cost and the size of an actuator by reducing a drive source of a base mechanism and a propulsion mechanism. Ž<P>SOLUTION: This actuator for intraductal moving body includes: a propulsion mechanism which generates a drive force via a duct wall to generate a propulsion force for movement in a duct; a base mechanism which supports the propulsion mechanism and causes the propulsion mechanism to abut against and separate from the duct wall; a pressure source connected to the base mechanism; and a valve provided between the propulsion mechanism and the base mechanism, having a characteristic being closed till becoming a predetermined positive pressure value when raising a positive pressure value after making the base mechanism the positive pressure by the pressure source and being opened when becoming the predetermined positive pressure value, and having a characteristic being closed till a predetermined negative pressure, when lowering a negative pressure value after making the base mechanism the negative pressure by the pressure source and being opened when becoming the predetermined negative pressure value. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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