SERIES FOR DIFFERENTIAL REDUCTION GEAR AND METHOD FOR MANUFACTURING SERIES FOR DIFFERENTIAL REDUCTION GEAR

摘要

[Problem] To share components and minimize manufacturing costs without reducing the strength of an externally toothed gear. [Solution] A series S having a plurality of differential reduction gears 1A-1C prepared at different reduction ratios, the differential reduction gears comprising: an internally toothed gear 4; an input shaft 12 that coaxially passes through the internally toothed gear 4; externally toothed gears 17A-17C that are externally fitted on eccentric parts 14A-14C provided to the input shaft 12, that mesh with the inner side of the internally toothed gear 4, and that have a plurality of pin holes 21A-21C in concentric circles; and an output shaft in which a plurality of pins 22, 22… loosely inserted into the pin holes 21A-21C are provided in concentric circles, the output shaft being rotated via the pins 22 at a prescribed reduction ratio due to the rotation of the input shaft 12 causing the externally toothed gears 17A-17C to move eccentrically; wherein the pin holes 21A-21C of the externally toothed gears 17A-17C are formed at different diameters for each externally toothed gear 17A-17C in accordance with the number of external teeth, and the internally toothed gear 4 and the pins 22 are shared.