Power flow, function - GF27.10-P-2009GZ

TRANSMISSION 722.9 in MODEL 164.1/8, 204.0, 216, 221, 251.0/1 up to Model Year 08/modification year 07 

Fig 1: Transmission Power Flow Function Diagram

Courtesy of MERCEDES-BENZ USA

Schematic representation, shown on model 164 

Power transmission, function 

The term "power flow" refers to the transmission paths of driving power and engine torques. Via the mechanical/hydraulic connection of the engine, torque converter, the downstream automatic transmission and transfer case the engine torques are transmitted to the drive wheels and converted in the transmission via several planetary gear sets.

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 set the torques going out from the torque converter, depending on the gear ratio and shift elements actuated, are passed on to the output shaft using multi-disk clutches and multi-disk 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.