| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction gear capable of easily obtaining a speed reduction rate around one over several tenth per step and of reducing the size and cost of the the reduction gear itself only by a combination of a pair of planetary gears and two spur gears. SOLUTION: This reduction gear has a rotary frame rotating by fitting to a power source rotating at a high rotation speed, and the pair of planetary gears rotatably mounted to the rotary frame. The reduction gear having the high speed reduction rate can be provided by operating the pair of planetary gears by gearing them with a fixed gear and a rotary gear having outside diameter sizes nearly equal to each other and having the numbers of teeth different from each other by one or more or by gearing them with the fixed gear and the rotary gear having the same number of teeth by combining the pair of planetary gears having the numbers of teeth different from each other by one or more. COPYRIGHT: (C)2007,JPO&INPIT
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