Designing on Original Three-axis Driving Planetary Gear Train Test Stand and Its Estimation Based on Trials

Abstract

In the present report, an original test stands are designed for novel three-axis driving with planetary gear train. In this test stand, there are three input/output shafts, and one of them must be shifted to parallel axis to measure torque on all axes. Furthermore, a design concept is discussed to achieve a stable controlled running condition from a view of inertia balance because the component of the shifted axis must be hollowed to make another axis through. Comparison between two different planetary gear trains; a system with hollowed carrier and one with hollowed ring gear, is performed using two kinds of constructed test stands. It is concluded that the balance of inertia among components in a planetary gear train is quite critical to achieve stable driving. Especially inertia of carrier and that of ring gear, which is largest inertia among the components, are recommended to be almost equal, because big torque generated by large inertia when rotation is fluctuated influences on the stability of a planetary gear train.