| 摘要 |
An electric actuator is capable of easily achieving reduction in weight and size when compared to a hydraulic cylinder device, capable of being used in place of the hydraulic cylinder device, and capable of freely extending in response to a suddenly-applied impact load. An electric actuator converts rotation of an electric motor into advancing/retracting motion of an output rod using a screw shaft and a nut member mounted to the screw shaft. The output rod includes: a drive cylinder, to which the nut member is provided, the drive cylinder being arranged around the screw shaft; and a movable cylinder arranged to overlap the drive cylinder around the screw shaft and freely advancing and retreating with respect to the drive cylinder. The electric actuator further includes a releasing mechanism provided between the drive cylinder and the movable cylinder, for engaging the movable cylinder with the drive cylinder.
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