Power flow in reverse gear, transmission mode "E", function - GF27.10-P-3034AHW

TRANSMISSION 722.9 in MODEL 204.0 as of model year 2011/YoM 10

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 2011/YoM 10

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 Mode Power Flow In Reverse Gear "E" Function Diagram

Courtesy of MERCEDES-BENZ USA

Function requirements

Circuit 87 ON
Circuit 61 ON

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 "E", 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.

Overview of system components for automatic transmission (AT)

GF27.10-P-9992AHW