Planetary Gear Train
The planetary gear train is only used to switch the rotational direction of the pulley shafts in R. The planetary gear train consists of the sun gear, the planetary pinion gears, and the ring gear. The sun gear is connected to the input shaft with splines. The pinion gears are mounted on the planetary carrier. The planetary carrier is located on the end of the input shaft, over the sun gear. The ring gear is located in the planetary carrier, and connected to the forward clutch drum. The sun gear inputs the engine power via the input shaft to the planetary gears, and the carrier outputs the engine power.
In D, S, and L (forward range), the pinion gears do not rotate and revolve around the sun gear, so the carrier rotates. In R (reverse range), the reverse brake locks the planetary carrier, and the sun gear drives the pinion gears to rotate. The pinion gears rotate, but do not revolve around the sun gear. The pinion gears drive the ring gear in the opposite direction from the rotational direction of the sun gear.