Automatic gearbox - Jatco (Power Flows): Description and operation (page 3 of 6)

3rd Gear (D selected)

1 High clutch 2 Front planetary gear 3 Rear planetary gear 4 Low one-way clutch 5 Low clutch 6 Input shaft

7 Output shaft 8 Idler gear 9 Reduction planetary gear 10 Reduction one-way clutch 11 Reduction brake

On 3rd gear selection, the high clutch, the low clutch, and the reduction brake are engaged. During acceleration in 3rd gear, the reduction one-way clutch is locked. Power flows from the input shaft in a clockwise direction to the high clutch through the front planetary carrier. The front planetary carrier is connected to the rear internal gear by the low clutch. The rear internal gear rotates clockwise at the same speed as the input shaft. The rear sun gear rotates clockwise at the same speed because it is connected to the input shaft and the rear internal gear. The rear pinion does not rotate. The rear planetary carrier rotates in the same direction and speed as the input shaft. The power flow from the rear planetary carrier is transmitted to the reduction gear via the output gear, idler gear, reduction internal gear, and the reduction planetary carrier. The power is then transmitted to the road wheels in the same way as 1st gear.