| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary gear speed reduction mechanism capable of achieving high speed reduction with a simpler configuration without spoiling intensity.SOLUTION: A planetary gear speed reduction mechanism includes: a sun gear 11 which becomes an input axis; a fixing ring gear 12; a stepped planetary gear 20 having a first gear part 21 and a second gear part 22 whose diameter is smaller than that of the first gear part 21; carriers 23 and 24 which rotatably support the stepped planetary gear 20 and which support the stepped planetary gear 20 so that it can freely revolve around the sun gear 11; and a movable ring gear 14 which becomes an output axis. The first gear part 21 engages with the sun gear 11 and the fixing ring gear 12, and the second gear part 22 engages with the movable ring gear 14. The tooth number difference between the first gear part 21 and the second gear part 22 is set to be "4". |
