Power flow in reverse gear, transmission mode "C", function - GF27.10-P-3031AHL

TRANSMISSION 722.9 (except 722.930) in MODEL 212 up to model year 2011/YoM 10 

Function requirements for power flow in reverse gear in transmission mode "C", general 

Fig 1: Transmission Function Diagram - Reverse Gear In Transmission Mode "C"

Courtesy of MERCEDES-BENZ USA

• Circuit 87 ON
• Engine running

Power flow in reverse gear, transmission mode "C", general 

The following multi-disk brakes and multi-disk clutches are engaged:

• Multidisk brake BR (41)
• Multidisk brake B3 (45)
• Multidisk clutch K3 (48)

In reverse gear with

transmission mode "C", 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). The increased torque and reduced rotational speed as a result 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 on the sun gear (11). Due to the stalled planet carrier (10), the rotational direction of the sun gear (11) reverses.

Front single planetary gear set 

There is a connection between the sun gear (14) and sun gear (11) via the engaged multi-disk clutch K3 (48). As a result sun gear (14) rotates at the same speed and direction of rotation as sun gear (11) and drives the planetary gears (52). The increased torque and reduced rotational speed as a result are transmitted via the planet carrier (13) to the transmission output shaft. The transmission output shaft thus rotates at reduced transmission input speed opposite to the direction of the engine.