Mercedes-Benz ML320. Service manual - part 188

 

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Mercedes-Benz ML320. Service 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 

 

 

 

 

 

 

 

 

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