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

TRANSMISSION 722.9 in MODEL 906 

Courtesy of MERCEDES-BENZ USA

Function requirements for power flow in 1st gear, general 

• "Circuit 87 ON"
• Engine running

Power flow in 1st gear, general 

The following multidisk brakes and multidisk clutches are engaged:

• Multidisk brake B2 (43)
• Multidisk brake B3 (45)
• Multidisk clutch K3 (48)

In 1st 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 

The small ring gear (5) is driven via the transmission input shaft. The long planetary gears (50) drive the short planetary gears (49) which roll in the stalled large ring gear (8). An increased torque and reduced RPM occur as a result which are transmitted 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.