Power transmission, function - GF27.10-P-2009AHW

TRANSMISSION 722.9 (except 722.930) in MODEL 204.0 as of model year 2009/YoM 08 

Fig 1: Transmission Power Flow Function Chart

Courtesy of MERCEDES-BENZ USA

Power transmission, general 

The term "power flow" refers to the transmission paths of driving power and engine torques. The engine torques are transmitted to the drive wheels via the mechanical-hydraulic connection of engine, torque converter, the downstream automatic transmission and rear axle differential.

Power is transferred in the torque converter via the driven impeller by diverting hydraulic fluid to the turbine wheel which is connected to the transmission input shaft.

When the torque converter lockup clutch is engaged, power is transmitted via this mechanical connection. Via the gear wheels of the individual planetary gear sets, the torques coming from the torque converter, depending on the gear ratio and shift elements actuated, are passed on to the transmission output shaft with the help of the multidisk clutches and multidisk brakes.

A reduction of the output speed in the low gears provides lower vehicle speeds with high tractive forces and drive torques at the drive wheels.

Further subfunctions are described in separate documents:

• Power flow in 1st gear, function 
• Power flow in 2nd gear, function 
• Power flow in 3rd gear, function 
• Power flow in 4th gear, function 
• Power flow in 5th gear, function 
• Power flow in 6th gear, function 
• Power flow in 7th gear, function 
• Power flow in reverse gear, transmission mode "C", function (up to model year 2011/YoM 10) 
• Power flow in reverse gear, transmission mode "E", function (as of model year 2011/YoM 10)