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Power Flow During Forward Travel, Function - GF27.10-P-3035ANG

Transmission 725.0 (except 725.017) in model 205 

Function requirements, general 

Power flow with forward travel, general 

The term "power flow" refers to the transmission paths of driving power and engine torques. The engine torques are transmitted to the drive wheels via the mechanical-hydraulic connection between the combustion engine, torque converter, the downstream automatic transmission and differential. Power is transferred in the torque converter via the driven impeller by diverting hydraulic fluid to the turbine wheel which is connected to the drive shaft. When the torque converter lockup clutch is engaged, power is transmitted via this mechanical connection. The gear wheels of the individual planetary gear sets forward the torques generated by the torque converter to the output shaft with the help of the multidisk clutches and multidisk brakes to match the transmission ratio and actuated shift elements.

A reduction of the output speed in the low gears provides lower vehicle speeds with high tractive forces and increased drive torque at the drive wheels.

G13024917Courtesy of MERCEDES-BENZ USA

1st gear power flow 

1st gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 1st gear, the power flows through the following gear sets:

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 connected to the ring gear (3) of planetary gear set (P2) via the multidisk clutch (E). The multidisk brake (B) brakes the sun gear (5) of planetary gear set (P2). Torque is increased and the speed is reduced. The ring gear (3) of the planetary gear set (P2) has a mechanical connection to the sun gear of the planetary gear set (P3). The planetary gears roll off the ring gear (6) of the planetary gear set (P3) locked in the multidisk brake (C). The planet carrier (2) of the planetary gear set (P3) transfers the torque and rotational speed to the output shaft (19). The output shaft (19) rotates with reduced input speed in the direction of engine rotation.

G13024918Courtesy of MERCEDES-BENZ USA

2nd gear power flow 

2nd gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

Power flow in 2nd gear takes place via the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The multidisk clutch (D) connects the drive shaft (18) to the planet carrier (8) of planetary gear set (P1) so that these revolve in the block. The multidisk clutch (E) makes a mechanical connection to the sun gear of planetary gear set (P3). The multidisk brake (C) brakes the ring gear (6) of planetary gear set (P3). Torque is increased and the speed is reduced. The planet carrier (2) of the planetary gear set (P3) transfers the torque and rotational speed to the output shaft (19). The output shaft (19) rotates with reduced input speed in the direction of engine rotation.

G13024919Courtesy of MERCEDES-BENZ USA

3rd gear power flow 

3rd gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

Power flow in 3rd gear takes place via the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The multidisk clutch (D) connects the drive shaft (18) to the planet carrier (8) of planetary gear set (P1) so that these revolve in the block. The ring gear of planetary gear set (P1) is driven by the planet carrier (8) of planetary gear set (P1). In turn, the ring gear drives the planet carrier of planetary gear set (P2). The multidisk brake (B) brakes the sun gear (5) of planetary gear set (P2). As a result, power is transmitted to the sun gear of planetary gear set (P3) via the ring gear (3) of planetary gear set (P2). The multidisk brake (C) brakes the ring gear (6) of planetary gear set (P3). Torque is increased and the speed is reduced. The planet carrier (2) of the planetary gear set (P3) transfers the torque and rotational speed to the output shaft (19). The output shaft (19) rotates with reduced input speed in the direction of engine rotation.

G13024920Courtesy of MERCEDES-BENZ USA

4th gear power flow 

4th gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 4th gear, the power flows through the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The planet carrier of planetary gear set (P4) is also driven. The sun gear (5) of planetary gear set (P2) is braked by the multidisk brake (B). The ring gear (3) of planetary gear set (P2) supports the sun gears of planetary gear set (P3) and planetary gear set (P4). The multidisk brake (C) brakes the ring gear (6) of planetary gear set (P3). The multidisk clutch (F) is closed and planetary gear set (P4) is switched in. Torque is increased and the speed is reduced. The planet carrier (2) of the planetary gear set (P3) and the ring gear (7) of the planetary gear set (P4) transfer the torque and rotational speed to the output shaft (19). The output shaft (19) rotates with reduced input speed in the direction of engine rotation.

G13024921Courtesy of MERCEDES-BENZ USA

5th gear power flow 

5th gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 5th gear, the power flows through the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The planet carrier of planetary gear set (P4) is also driven by the drive shaft (18). The multidisk clutch (D) connects the drive shaft (18) to the planet carrier (8) of planetary gear set (P1) so that these revolve in the block. The ring gear of planetary gear set (P1) supports the planet carrier of planetary gear set (P2). The multidisk brake (B) brakes the sun gear (5) of planetary gear set (P2). As a result, the ring gear (3) of planetary gear set (P2) transmits power to the sun gear of planetary gear set (P4). Torque is increased and the speed is reduced. The ring gear (7) of the planetary gear set (P4) transfers the torque and rotational speed to the output shaft (19) through the closed multiplate clutch (F). The output shaft (19) rotates with reduced input speed in the direction of engine rotation.

G13024922Courtesy of MERCEDES-BENZ USA

Power flow in 6th gear 

Power flow in 6th gear 

The following multidisk brakes and multidisk clutches are engaged:

The power flow in 6th gear takes place via the following gear sets:

The planet carrier of planetary gear set (P4) is driven by the drive shaft (18). The multidisk clutch (D) and multidisk clutch (E) connect the respective elements of planetary gear set (P1) and planetary gear set (P2). As a result, these revolve in the block and support the sun gear of planetary gear set (P4). Via the closed multidisk clutch (F), the ring gear (7) of planetary gear set (P4) transmits the torque to the output shaft (19). The output shaft (19) rotates at the input speed in the direction of engine rotation.

G13024923Courtesy of MERCEDES-BENZ USA

7th gear power flow 

7th gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 7th gear, the power flow occurs through the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The planet carrier of planetary gear set (P4) is also driven by the drive shaft (18). The ring gear of planetary gear set (P1) supports the planet carrier of planetary gear set (P2). The ring gear of planetary gear set (P1) is driven by the planet carrier (8) of planetary gear set (P1). The multidisk brake (B) brakes the sun gear (5) of planetary gear set (P2). As a result, the ring gear (3) of planetary gear set (P2) transmits power via the closed multidisk clutch (E) to the sun gear of planetary gear set (P4). Torque is reduced and the speed is increased. The ring gear (7) of the planetary gear set (P4) transfers the torque and rotational speed to the output shaft (19) through the closed multiplate clutch (F). The output shaft (19) rotates with increased input speed in the direction of engine rotation.

G13024924Courtesy of MERCEDES-BENZ USA

8th gear power flow 

8th gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 8th gear, the power flows via the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The planet carrier of planetary gear set (P4) is also driven by the drive shaft (18). The planet carrier (8) of planetary gear set (P1) is braked by actuation of the multidisk brake (A). The sun gear of planetary gear set (P4) is connected to the planet carrier (8) of planetary gear set (P1) through actuation of the multidisk clutch (E) and also braked. Torque is reduced and the speed is increased. The ring gear (7) of the planetary gear set (P4) transfers the torque and rotational speed to the output shaft (19) through the closed multiplate clutch (F). The output shaft (19) rotates with increased input speed in the direction of engine rotation.

G13024925Courtesy of MERCEDES-BENZ USA

9th gear power flow 

9th gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 9th gear, the power flows through the following gear sets:

The sun gear (1) of planetary gear set (P1) is part of the drive shaft (18) and is driven by this. The planet carrier of planetary gear set (P4) is also driven by the drive shaft (18). The planet carrier (8) of planetary gear set (P1) is braked by actuation of 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). The multidisk brake (B) brakes the sun gear (5) of planetary gear set (P2). The ring gear (3) of planetary gear set (P2) drives the sun gear of planetary gear set (P4). Torque is reduced and the speed is increased. The ring gear (7) of the planetary gear set (P4) transfers the torque and rotational speed to the output shaft (19) through the closed multiplate clutch (F). The output shaft (19) rotates with increased input speed in the direction of engine rotation.

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