Mercedes-Benz ML320. Manual — part 188

Fig. 125: Power Flow In 2nd Gear Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Principals of power transmission in 2nd gear

Torque from the torque converter is increased via the propeller shaft (1) and the center and rear planetary
gearsets and transferred to the output shaft (5). See Fig. 125.

The following are not engaged:



Front Multi-Disc Brake (B1)



Center Multi-Disc Brake (B3)

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me



Freewheel (F1)



Center Multi-Disc Clutch (K2)

Front Planetary Gear Set

The planet carrier (V3) and sun gear (V1) are rigidly connected to each other via the engaged front multi-disc
clutch (K1). The planetary gearset is therefore blocked and turns as a closed unit at the input speed due to the
mechanical connection of the ring gear (V4) and propeller shaft.

Rear Planetary Gear Set

The internal gear (H4) turns at the input speed because of its mechanical connection to the front planet carrier
(V3). The sun gear (H1) is supported via the engaged rear multi-disc brake (B2) and in drive mode via the
locked freewheel (F2), in overrun mode via the engaged rear multi-disc clutch (K3) in the housing. The planet
gears (H2) roll over the fixed sun gear (H1) and provide an increase in torque between the internal gear (H4)
and the planet carrier (H3). The planet carrier (H3) moves at a reduced speed in the direction of engine rotation.

Center Planetary Gear Set

The ring gear (M4) is driven at the same speed as the rear planet carrier (H3) as a result of a mechanical
connection. The sun gear (M1) is supported in the housing via the rear multi-disc brake (B2). The planet gears
(M2) roll over the fixed sun gear (M1) and provide an increase in torque between the internal gear (M4) and the
planet carrier (M3). The output shaft (5) connected to the planet carrier (M3) turns at a reduced speed in the
running direction of the engine.

Torque Converter, Location/Task/Design/Function

See TORQUE CONVERTER, LOCATION/TASK/DESIGN/FUNCTION.

Planetary Gear Set, Location/Task/Design/Function

See PLANETARY GEAR SET, LOCATION/TASK/DESIGN/FUNCTION.

Multiple-Disc Brake, Location/Task/Design/Function

See MULTIPLE-DISC BRAKE, LOCATION/TASK/DESIGN/FUNCTION.

Multi-Plate Clutch, Location/Task/Design/Function

See MULTI-PLATE CLUTCH, LOCATION/TASK/DESIGN/FUNCTION.

Location/Task/Design/Function Of Freewheel

See LOCATION/TASK/DESIGN/FUNCTION OF FREEWHEEL.

Power Flow In 3rd Gear Function

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

Fig. 126: Power Flow In 3rd Gear Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Principal of power transmission in 3rd gear

Torque from the torque converter is increased via the propeller shaft (1) and the center planetary gearset and
transferred to the output shaft (5). See Fig. 126.

The following are not engaged:



Front multi-disc brake (B1).



Center multi-disc brake (B3).

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me



Freewheel F1.



Freewheel F2.



Rear multi-disc clutch (K3).

Front Planetary Gear Set

The planet carrier (V3) and sun gear (V1) are rigidly connected to each other via the engaged front multi-disc
clutch (K1). The planetary gearset is therefore blocked and turns as a closed unit at the input speed due to the
mechanical connection of the ring gear (V4) and propeller shaft.

Rear Planetary Gear Set

The center multi-disc clutch (K2) is engaged and transmits the input speed of the input shaft (1) to the planet
carrier (H3) via the hollow gear (M4). The ring gear (H4) turns in the same way as the planet carrier (H3) due to
the mechanical connection with the locked front planetary gearset. This planetary gearset is therefore locked
and turns as a closed unit.

Center Planetary Gear Set

The hollow gear (M4) rotates at input speed due to the engaged center multi-disc clutch (K2). The sun gear
(M1) is supported in the housing via the multi-disc brake (B2). The planet gears (M2) roll over the fixed sun
gear (M1) and provide an increase in torque between the internal gear (M4) and the planet carrier (M3). The
output shaft (5) connected to the planet carrier (M3) turns at a reduced speed in the running direction of the
engine.

Torque Converter, Location/Task/Design/Function

See TORQUE CONVERTER, LOCATION/TASK/DESIGN/FUNCTION.

Planetary Gear Set, Location/Task/Design/Function

See PLANETARY GEAR SET, LOCATION/TASK/DESIGN/FUNCTION.

Multiple-Disc Brake, Location/Task/Design/Function

See MULTIPLE-DISC BRAKE, LOCATION/TASK/DESIGN/FUNCTION.

Multi-Plate Clutch, Location/Task/Design/Function

See MULTI-PLATE CLUTCH, LOCATION/TASK/DESIGN/FUNCTION.

Power Flow In 4th Gear Function

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me