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

Reverse Gear

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

7 Output gear 8 Idler gear 9 Torque converter 10 Reduction planetary gear 11 Reduction one-way clutch 12 Reduction brake

On reverse gear selection, the reverse clutch, the low and reverse brake, and the reduction brake are engaged. Power flows from the input shaft to the reverse clutch and the front sun gear. The low and reverse brake is engaged, locking the front planetary carrier in position. When the front sun gear rotates clockwise, the front planetary carrier remains locked. The front pinion gears rotate anti-clockwise, forcing the internal gear and output gear to rotate anti-clockwise. The output gear rotation is transmitted to the reduction internal gear by the idler gear. The reduction brake locks the reduction sun gear, the reduction planetary carrier rotates in the reverse direction to the forward ranges and transmits drive to the road wheels through the final drive.