Planetary gear, planetary reducer, and planetary gear manufacturing method

摘要

Problem to be solved: to provide a technology capable of fixing the first planetary gear and the second planetary gear while suppressing the change in the tooth shape of the first planetary gear when the planetary gear having the first planetary gear and the second gear having a smaller diameter than the first planetary gear is produced.The planetary gear has a first planetary gear and a second planetary gear having a smaller diameter than the first planetary gear.The first planetary gear has a first spline on the inner peripheral surface.The first spline has a plurality of internal teeth extending axially.The second planetary gear has a second spline on the outer peripheral surface.The second spline has a plurality of external teeth extending axially.The first spline and the second spline are fitted by clearance or intermediate fit.The planetary gear has a fixed portion on the axial end surface.In the fixed portion, the tooth cross section of the second spline is larger than the cross section of the other portion of the second spline.Further, the inner teeth and the external teeth are closely connected to each other in the fixing portion.Diagram