Power Flow In Reverse, Function - GF27.10-D-3019H

Transmission 722.6 in MODEL 906.111/113/131/133/135/153/155/211/213/231/233/235/253/255/611/613/631/633/635/637/653/655/657/711/713/731/733/735 

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

Principle of power flow in reverse gear 

Via the input shaft (1) and involving the center planetary gear set and the rear planetary gear set the torque going out from the torque converter is increased and transmitted to the output shaft (5) with a reversed direction of rotation.

The following are not engaged:

• Multidisk brake B1 (21)
• Multidisk brake B2 (22)
• Overrunning clutch F1 (27)
• Overrunning clutch F2 (28)
• Multidisk clutch K2 (26)

Front planetary 

The planet carrier (29/3) and the sun gear (29/1) are connected rigidly to each other via the engaged multidisk clutch K1 (24). The planetary gear set is therefore blocked and turns as a closed unit at the input speed due to the mechanical connection of the ring gear (29/4) and propeller shaft (1).

Rear planetary gear set 

The planet carrier is held at the housing by the engaged multidisk brake B3 (23) (31/3). The internal geared wheel (31/4) turns at the input speed because of its mechanical connection with the blocked planet carrier. The planet gears (31/2) turn between the ring gear (31/4) and the sun gear (31/1). Due to the held planet carrier (31/3) a direction reversal takes place so that the sun gear (31/1) turns in the opposite direction to the direction of engine rotation.

Center planetary gear set 

The ring gear (30/4) is held securely at the housing by the multidisk brake B3 (23) via the mechanical connection to the planet carrierr (31/3). The sun gear (30/1) turns backwards due to the engaged multidisk clutch K3 (26). The planetary gears (30/2) roll on the fixed sun gear (30/4) and take care of a torque increase when the power is transmitted from the ring gear (30/1) to the planet carrier (30/3).

The output shaft (5) connected to the planet carrier (30/3) turns at reduced speed opposite to the direction of engine rotation.