Power flow in reverse, function - GF27.10-P-3019GGA

TRANSMISSION 722.902 in MODEL 463.306/336/346 up to 31.5.12 as of Model Year 2011/YoM 10

TRANSMISSION 722.904 in MODEL 463.202/222/236/237 up to 31.5.12 as of Model Year 2009/YoM 08

TRANSMISSION 722.902 in MODEL 463.303/340/341 up to 31.5.12 as of Model Year 2009/YoM 08

Function requirements for power flow in reverse gear, general

Fig 1: Reverse Gear Power Flow Function Diagram

Courtesy of MERCEDES-BENZ USA

Circuit 87 ON
Circuit 61 ON

Power flow in reverse, general

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

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

The power flow in the reverse gear 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.