| 摘要 |
A planetary gear decelerator is provided to extend lifetime of the decelerator by supporting a gear shaft or an output shaft against a radial moment or a twist. A ring-type ring gear(200) is arranged to be apart from a linear gear(100). A rotation gear(300) is rotated between the linear and ring gears and rotates the ring gear by the linear gear. Inner and outer portions of the rotation gear are coupled with the linear and ring gears, respectively. A planetary gear(400) is coupled between the linear and ring gears, such that inner and outer portions are coupled with the linear and ring gears, respectively. The planetary gear is rotated or revolved according to a relative rotation speed between the linear and ring gears. An output shaft(500) is coupled with a rotation shaft of the planetary gear and rotated at an angular velocity corresponding to revolution speed of the planetary gear.
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