| 摘要 |
PURPOSE: A structure and a method are provided to control a backlash without reproducing the entire gear. CONSTITUTION: A large driving gear(11) is positioned under a spur gear. A slave gear(12) is installed to be geared with the driving gear(11). Many gear teeth(15,16) are arranged in circumferences of ring-type bodies(13,14) having axial combining holes(11a,12a). A power transmission is performed in an inserted state of the gear tooth(16) in a tooth groove of the driving gear(11) when the spur gear is used as a normal electromotive gear. To exactly transmit the power or not to generate a vibration, the slave gear(12) is moved axially. The spur gear is used by combining the slave gear(12) not to form a backlash between the gear groove and the gear tooth(16). Thereby, the gear is used by controlling the backlash according to the electromotive characteristic.
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