Automatic gearbox - Jatco (Power Flows): Description and operation (page 2 of 6)

2nd Gear (D selected)

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

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

On 2nd gear selection, the low clutch, the 2-4 brake, and the reduction brake are engaged. During acceleration in 2nd gear, the reduction one-way clutch is locked. Power flows from the input shaft to the rear sun gear to rotate it clockwise and the rear pinion gear rotates anti-clockwise. The 2-4 brake locks the front sun gear. The front pinion gear rotates clockwise to force the front planetary carrier to rotate clockwise. The driven power rotates the front internal gear clockwise. The output gear rotates faster due to the front internal gear rotation. The output gear rotation is transmitted to the reduction gear. The reduction gear rotates clockwise and transmits the power to the road wheels in the same way as 1st gear.