Power Flow In 1ST Gear, Function - GF27.10-D-3011H

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 1st gear: 

Via the input shaft (1) and involving all 3 planetary gear sets the torque going out from the torque converter increases and is transmitted to the output shaft (5).

The following are not engaged:

• Multidisk clutch K1 (24)
• Multidisk clutch K2 (25)
• Multidisk brake B3 (23)

Front planetary gear set 

The input shaft (1) drives the ring gear (29/4). In drive mode, the sun gear (29/1) is supported at the housing via the locked overrunning clutch F1 (27) and, in overrun mode, via the engaged multidisk brake B1 (21). The planetary gears (29/2) roll on the fixed sun gear (29/1) and take care of a torque increase when the power is transmitted from the ring gear (29/4) to the planet carrier (29/3). The planet carrier (29/3) moves at reduced speed in the direction of engine rotation.

Rear planetary gear set 

The ring gear (31/4) rotates at reduced 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 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.