Power Flow In Reverse Gear, Program Selection "W", Function (722.6 Model 211 Up To 08/31/03)

Fig 1: Power Flow In Reverse Gear, Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Power Flow In Reverse Gear

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Principle Of Power Flow In reverse Gear 

1. Program Selection "W"
   
   Torque from the torque converter is increased via the drive shaft (1) and the center planetary gearset and rear planetary gearset and transferred with reversed direction of rotation to the output shaft (5). See Fig 1. The following components are not engaged:
   • Front Multi-Disk Brake (B1)
   • Rear Multi-Disk Brake (B2)
   • Freewheel (F1)
   • Freewheel (F2)
   • Center multi-disk clutch (K2)
2. Front Planetary Gearset
   
   The planetary carrier (V3) and sun gear (V1) are rigidly connected via the engaged front multi-disk clutch (K1). The planetary gearset is therefore locked and turns as a closed unit at the input speed due to the mechanical connection of the internal-geared wheel (V4) and drive shaft (1). See Fig 2.
3. Rear Planetary Gearset
   
   The engaged center multi-disk brake (B3) holds the planet carrier (H3) against the housing. The internal geared wheel (H4) turns at the input speed because of its mechanical connection with the locked planet carrier (V3). The planet gears (H2) turn between the internal-geared wheel (H4) and the sun gear (H1). The direction is reversed by the fixed planet carrier (H3) so that the sun gear (H1) turns in the opposite direction to the running direction of the engine.
4. Center Planetary Gearset
   
   The internal geared wheel (M4) is held against the housing by the center multi-disk brake (B3) via the mechanical connection with the planet carrier (H3). The sun gear (M1) to the planet carrier (M3). The output shaft (5) connected to the planet carrier (M3) turns at a reduced speed in the opposite direction to the running direction of the engine.

1. Torque Converter, Location/Task/Design/Function
   
   See TORQUE CONVERTER, LOCATION/TASK/DESIGN/FUNCTION .
2. Planetary gearset, Location/Task/Design/Function
   
   See PLANETARY GEAR SET, LOCATION/TASK/DESIGN/FUNCTION .
3. Multi-Disk Brake, Location/Task/Design/Function
   
   See MULTIPLE-DISC BRAKE, LOCATION/TASK/DESIGN/FUNCTION .
4. Multi-Disk Brake, Location/Task/Design/Function
   
   See MULTI-PLATE CLUTCH, LOCATION/TASK/DESIGN/FUNCTION .
5. Freewheel, Location/Task/Design/Function
   
   See LOCATION/TASK/DESIGN/FUNCTION OF FREEWHEEL .