Planetary gear speed reducer and method for manufacturing the same

摘要

A planetary gear speed reducer and a method for manufacturing the same, which enable an output flange body and a main bearing to be more easily assembled to a casing, are obtained. A planetary gear speed reducer 10 equipped with an external gear (planetary gear) 14 includes a casing 50; an output flange body 34 arranged at an axial side portion of the external gear 14; and a main bearing 40 arranged between the casing 50 and the output flange body 34. The output flange body 34 includes a carrier body portion 34A located closer to the external gear 14 side than the main bearing 40. A snap ring 60 that restricts axial movement of the main bearing 40 is arranged between the main bearing 40 and the carrier body portion 34A of the output flange body 34 in the casing 50. The carrier body portion 34A of the output flange body 34 is provided with a recessed portion 64 (or hole) for allowing a jig that fits the snap ring 60 to be inserted therethrough.