Power Flow During Reverse Travel, Function - GF27.10-P-3036ANI

Transmission 725.0 in model 253 

Power flow for reverse gear in transmission 725.004/008/011/041/044/048/054/058 

Courtesy of MERCEDES-BENZ USA

Power flow for reverse gear in transmission 725.096 

Courtesy of MERCEDES-BENZ USA

Function requirements, general 

• Engine running

Power flow in reverse, general 

All planetary gear sets consist of the following elements: sun gear, planetary gears, planet carrier and annulus gear.

The following multidisk brakes are engaged:

• Multidisk brake (B)
• Multidisk brake (C)
• Multidisk brake (A)

The power flow in the reverse gear flows through the following gear sets:

• Planetary gear set (P1)
• Planetary gear set (P2)
• Planetary gear set (P3)

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The planet carrier (8) of planetary gear set (P1) is braked by the multidisk brake (A). The power flow runs via the ring gear of planetary gear set (P1) to the planet carrier of planetary gear set (P2). Here, the planet carrier of planetary gear set (P2) rolls on the sun gear (5), braked by the multidisk brake (B), of the planet carrier of planetary gear set (P2). The ring gear (3) of planetary gear set (P2) drives the sun gear of planetary gear set (P3). The multidisk brake (C) brakes the ring gear (6) of planetary gear set (P3). The planet carrier (2) of planetary gear set (P3) transmits the resulting increased torque and reduced speed to the output shaft (19). The output shaft (19) subsequently rotates with reduced input speed against the direction of engine rotation.