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

TRANSMISSION 722.9 in MODEL 906 

Courtesy of MERCEDES-BENZ USA

Function requirements for power flow in 2nd gear, general 

• "Circuit 87 ON"
• Engine running

Power flow in 2nd gear, general 

The following multidisk brakes and multidisk clutches are engaged:

• Multidisk brake B1 (42)
• Multidisk brake B2 (43)
• Multidisk clutch K3 (48)

Power flow in 2nd gear takes place via the following gear sets:

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

Ravigneaux gear set 

The small ring gear (5) is driven via the transmission input shaft. The long planetary gears (50) roll over the stalled sun gear (7) and transmit the increased torque and reduced rotational speed as a result to the dual planet carrier (6).

Rear single planetary gear set 

The ring gear (9) rotates at the same speed due to the mechanical connection to the dual planet carrier (6). The planetary gears (51) roll over the stalled sun gear (11) and transmit the rotary motion to the planet carrier (10).

Front single planetary gear set 

The ring gear (12) has a mechanical connection to the planet carrier (10) and rotates at the same 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.