Figure 7
From: Recirculation of Parallel-Connected Planetary Gear Trains

Torque directions and power flow of Simpson gear train: (a) 3-4-1, (b) 3-2-1, (c) 1-4-3, (d) 1-2-3
From: Recirculation of Parallel-Connected Planetary Gear Trains
Torque directions and power flow of Simpson gear train: (a) 3-4-1, (b) 3-2-1, (c) 1-4-3, (d) 1-2-3