Mercedes-Benz ML320. Manual — part 185

Fig. 118: Power Flow In 1st Gear, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Principal of power transmission in 1st gear

The torque coming from the torque converter is increased and transmitted to the output shaft (5) via the input
shaft (1), involving all three planetary gear sets. See Fig. 118.

The following are not engaged:



Front Multi-Disc Clutch (K1)

2001 Mercedes-Benz ML320

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

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

Center Multi-Disc Clutch (K2)



Center Multi-Disc Brake (B3)

Front Planetary Gear Set

The input shaft (1) drives the internal gear (V4). In drive mode the sun gear (V1) is supported via the locked
freewheel F1 and in overrun mode via the engaged front multi-disc brake (B1) in the housing (B1). The
planetary gears (V2) roll over the fixed sun gear (V1) and provide an increase in torque between the internal
gear (V4) and the planet carrier (V3). The planet carrier (V3) moves at reduced speed in the direction of engine
rotation.

Rear Planetary Gear Set

The internal gear (H4) turns at a reduced speed because of its mechanical connection to the front planet carrier
(H3). 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) (M1). 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.

2001 Mercedes-Benz ML320

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

me

PLANETARY GEAR SET, LOCATION/TASK/DESIGN/FUNCTION

Fig. 119: Planetary Gear Set, Location/Task/Design/Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Planetary Gear Set, Location

2001 Mercedes-Benz ML320

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

me

Three planetary gear sets are used to produce the different gear ratios. These are located in the mechanical
part of the transmission as the front, center and rear planetary gear set (V, M, H).

Planetary Gear Set, Task

Power transmission and production of different gear ratios.

Planetary Gear Set, Design

A planetary gear set consists of the ring gear (1), the planet gears (2) carried in the planet carrier (4) and
the sun gear (3).

Planetary Gear Set, Function

See PLANETARY GEAR SET, FUNCTION.

Planetary Gear Set, Function

2001 Mercedes-Benz ML320

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

me