Power flow in 4th gear, function - GF27.10-P-3014GGA

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

Fig 1: Fourth Gear Power Flow Function Diagram

Courtesy of MERCEDES-BENZ USA

Function requirements for power flow in 4th gear, general

Circuit 87 ON
Circuit 61 ON

Power flow in 4th gear, general

The following multi-disk brakes and multi-disk 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 multi-disk 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

Due to the engaged multidisk clutch K2 (47) the rotational speeds of ring gear (9) and ring gear (12) are the same. As a result the rear single planetary gear system is locked and not actively involved in the gear ratio.

Front single planetary gear set

Due to the engaged multi-disk 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.