Power Flow In 2ND Gear, Function - GF27.10-D-3012H

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 2nd gear 

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

The following are not engaged:

• Multidisk brake B1 (21)
• Multidisk brake B3 (23)
• Overrunning clutch F1 (27)
• Multidisk clutch K2 (25)

Front planetary gear set 

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 front planetary gear set is thus blocked and turns as a closed unit with input speed due to the mechanical connection between the ring gear (29/4) and input shaft (1).

Rear planetary gear set 

The ring gear (31/4) rotates at input speed due to the mechanical connection to the planet carrier (29/3). The sun gear (31/1) is supported at the housing via the engaged multidisk brake B2 (22) and, in drive mode, via the locked overrunning clutch F2 (28) and, in overrun mode, via the engaged multidisk clutch K3 (26). The planetary gears (31/2) roll on the fixed sun gear (31/1) and take care of a torque increase when the power is transmitted from the ring gear (31/4) to the planet carrier (31/3). The planet carrier (31/3) moves at reduced speed in the direction of engine rotation.

Center planetary gear set 

Due to a mechanical connection, the ring gear (30/4) is driven at the same speed as the planet carrier (31/3). The sun gear (30/1) is supported at the housing via the multidisk brake B2 (22).

The planetary gears (30/2) roll on the fixed sun gear (30/1) and take care of a torque increase when the power is transmitted from the ring gear (30/4) to the planet carrier (30/3). The output shaft (5) connected to the planet carrier (30/3) turns at a reduced speed in the direction of engine rotation.