| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal planetary gear device capable of reducing oscillation and pulsation of a device by making the device compact, increasing a transmission capacity and rationally offsetting a moment. SOLUTION: The internal planetary gear device has external tooth gears which perform a planetary movement and its central axis located inside a periphery of the external tooth gears. Each of 2n (n is an integer not smaller than 2) external tooth gears has a phase difference of 360/2n (degrees) in a circumference direction R of a central axis. Two external tooth gears having the phase difference of 180°among the 2n external tooth gears are adjacent to an axial direction V of the central axis. COPYRIGHT: (C)2003,JPO
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