Power flow in 1st gear, function - GF27.10-P-3011AHS

TRANSMISSION 722.9 in MODEL 216.3 as of model year 2009 / YoM 08

TRANSMISSION 722.9 in MODEL 216.3 (except 216.374) as of Model Year 2011/YoM 10 model refinement package

TRANSMISSION 722.9 in MODEL 221.0 as of model year 2009 / YoM 08

TRANSMISSION 722.9 in MODEL 221.0 (except 221.095)

TRANSMISSION 722.9 in MODEL 221.0 (except 221.074) as of Model Year 2011/YoM 10

TRANSMISSION 722.9 in MODEL 221.1 as of model year 2009 / YoM 08

TRANSMISSION 722.9 in MODEL 221.1 (except 221.195)

TRANSMISSION 722.9 in MODEL 221.1 (except 221.174) as of Model Year 2011/YoM 10

Fig 1: Identifying Power Flow Diagram Of 1st Gear

Courtesy of MERCEDES-BENZ USA

Function requirements for power flow in 1st gear, general

Circuit 87 ON
Engine running

Power flow in 1st gear, general

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

Multidisk brake B2 (43)
Multidisk brake B3 (45)
Multidisk clutch K3 (48)

In 1st 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

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). An increased torque and reduced RPM occur as a result which 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 over the stalled sun gear (11) and transmit the rotary motion to the planet carrier (10).

Front single planetary gear set

The ring gear (12) has a mechanical connection to the planet carrier (10) and rotates at the same 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-9992AHS