Power Flow In 4TH Gear, Function - GF27.10-D-3014H

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 4th gear 

Due to the direct gear ratio of 4th gear (i=1) no torque conversion or speed conversion takes place. Power is transmitted from the input shaft (1) via the 3 blocked planetary gear sets to the output shaft (5).

The following are not engaged:

• Multidisk brake B1 (21)
• Multidisk brake B2 (22)
• Multidisk brake B3 (23)
• Overrunning clutch F1 (27)
• Overrunning clutch F2 (28)

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 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 multidisk clutch K2 (25) is engaged and transmits the input rotational speed of the drive shaft (1) to the planet carrier (31/3) via the ring gear (31/4). Via the mechanical connection to the blocked front planetary gear set the ring gear (31/4) turns at the same rotational speed as the planet carrier (31/3). The planetary gear set is thus blocked and turns as a closed unit.

Center planetary gear set 

The ring gear (30/4) turns at the input rotational speed due to the engaged multidisk clutch K2 (25). The multidisk clutch K3 (26) connects the sun gears of the center planetary gear set and rear planetary gear set. Due to the equality of speeds of the ring gear (30/4) and sun gear (30/1) the planetary gear set is locked and turns as a closed unit.