| 摘要 |
PURPOSE:To simplify and miniaturize the structure of a planetary gear speed reduction mechanism and as well to make it possible to obtain a high reduction ratio, by constituting the planetary gear speed reduction mechanism with the use of bevel gears. CONSTITUTION:An arm 4 is secured to the inner end of a first rotary shaft S1, perpendicularly to the center line of the shaft, and a pair of planetary gears P is journalled to this arm 4 by means of bearings 5, 6 so that the gears P are rotatable about the center line. The pair of the planetary gears P has two of first and second bevel gears A, C which are directly connected by a shaft so that they are rotated together. Meanwhile a bevel gear D is secured to the inner end of a second rotary shaft S2, and is meshed with the second bevel gear C of the pair of the planetary gears P. Further, a bevel gear B is secured to a frame 1 on the same side as that of the rotary bevel gear D with respect to the orbital plane PL of the pair of the panetary gear P, and is meshed with the first bevel gear A of the pair of the planetary gears P.
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