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

TRANSMISSION 722.9 in MODEL 204.0 as of model year 2009/YoM 08

TRANSMISSION 722.9 in MODEL 204.0 as of model year 2012/YoM 11 model refinement package

TRANSMISSION 722.9 in MODEL 204.2 as of model year 2009/YoM 08

TRANSMISSION 722.9 in MODEL 204.2 as of model year 2012/YoM 11 model refinement package

TRANSMISSION 722.9 in MODEL 204.3

TRANSMISSION 722.9 in MODEL 204.9

Fig 1: Identifying Transmission Power Flow Function Diagram (4th Gear)

Courtesy of MERCEDES-BENZ USA

Function requirements for power flow in 4th gear, general

Circuit 87 (connected circuit 15) ON
Engine running

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

The engaged multidisk clutch K2 (47) means that the rpm of the ring gears (9, 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.

Overview of system components for automatic transmission (AT)

GF27.10-P-9992AHW