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

TRANSMISSION 722.9 in MODEL 906 

Courtesy of MERCEDES-BENZ USA

Function requirements for power flow in 4th gear, general 

• "Circuit 87 ON"
• Engine running

Power flow in 4th gear, general 

The following multidisk brakes and multidisk clutches are engaged:

• Multidisk brake B2 (43)
• Multidisk clutch K1 (46)
• Multidisk clutch K2 (47)

In 4th gear, the power flows through the following gear sets:

• Ravigneaux gear set 
• Rear single planetary gear set 
• Front single planetary gear set 

Ravigneaux gear set 

Due to the engaged multidisk clutch K1 (46) the components of the Ravigneaux gear set are locked together and pass on the transmission input torque and transmission input speed unchanged to the ring gear (9).

Rear single planetary gear set 

The engaged multidisk clutch K2 (47) means that the RPM of the ring gears (9, 12) are the same. As a result the rear single planetary gear set is locked and not actively involved in the gear ratio.

Front single planetary gear set 

Due to the engaged multidisk clutch K2 (47) the ring gear (12) is driven at transmission input speed. The planetary gears (52) roll on the stalled sun gear (14) and transfer the increased torque and reduced rotational speed to the transmission output shaft via the planet carrier (13). The transmission output shaft thus rotates with reduced transmission input speed in the direction of rotation of the engine.