ABSTRACT
The main elements of planetary gear trains are gears, shafts and pins, carrier, housing and gear couplings. The design of a sun gear largely depends on how the load distribution between the planets is equalized. Since the ring gear is a thin-walled and easily deformable part, it is necessary that when tightened on the gear-cutting machine, there are no deformations which will subsequently occur in the performance of the gear train in a very unfavorable manner. With respect to the thermal and chemico-thermal treatment of gears, it is imperative that the designer works in close contact with the metallurgical specialist in the plant. The purpose of the housing is to close the inner space and, when either the ring gear or the carrier is fixed, take up the reactive torque of the seating. In case of powerful, large-scale gears with significant heat dissipation and hence significant thermal expansion, the feet are positioned at the center axis level.
