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

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Transmission 725.0 in model 253 

Function requirements, general 

Power flow with forward travel, general 

The term "power flow" refers to the transmission paths of driving power and engine torques. Engine torques are transferred through the drive wheels to the mechanical-hydraulic connection of the internal combustion engine, torque converter (transmission 725.004/008/011/041/044/048/054/058) or wet clutch (transmission 725.096) to the downstream automatic transmission and differential.

Transmission 725.004/008/011/041/044/048/054/058 

Transmission 775 096 

The gearwheels of the individual planetary gear sets forward the torques from the torque converter (transmission 725.004/008/011/041/044/048/054/058) or the wet clutch (transmission 725.096), depending on the transmission ratio involved and the actuated shift elements, with the aid of multiplate clutches and multidisk brakes to the output shaft.

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.

Power flow in 1st gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472076Courtesy of MERCEDES-BENZ USA

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). As a result, the torque increases and the rotational speed is decreased. The ring gear (3) of planetary gear set (P2) has a mechanical connection to the sun gear (1) of planetary gear set (P3). The planetary gears roll in the ring gear (6), stalled by the multidisk brake (C), of planetary gear set (P3) and the planet carrier (2) of planetary gear set (P3) transmits the thereby increased torque and reduced rotational speed to the output shaft (19). As a result, the output shaft (19) rotates at a reduced input speed in the direction of engine rotation.

Power flow in 2nd gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472077Courtesy of MERCEDES-BENZ USA

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). The planet carrier (2) of planetary gear set (P3) transmits the resulting increased torque and reduced speed to the output shaft (19). As a result, the output shaft (19) rotates at a reduced input speed in the direction of engine rotation.

Power flow in 3rd gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472078Courtesy of MERCEDES-BENZ USA

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). The planet carrier (2) of planetary gear set (P3) transmits the resulting increased torque and reduced speed to the output shaft (19). As a result, the output shaft (19) rotates at a reduced input speed in the direction of engine rotation.

Power flow in 4th gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472079Courtesy of MERCEDES-BENZ USA

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. The planet carrier (2) of planetary gear set (P3) and the ring gear (7) of planetary gear set (P4) transmit the thereby increased torque and reduced rotational speed to the output shaft (19). As a result, the output shaft (19) rotates at a reduced input speed in the direction of engine rotation.

Power flow in 5th gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472080Courtesy of MERCEDES-BENZ USA

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). Via the closed multidisk clutch (F), the ring gear (7) of planetary gear set (P4) transmits the thereby increased torque and reduced rotational speed to the output shaft (19). As a result, the output shaft (19) rotates at a reduced input speed in the direction of engine rotation.

Power flow in 6th gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472081Courtesy of MERCEDES-BENZ USA

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.

Power flow in 7th gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472082Courtesy of MERCEDES-BENZ USA

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). Via the closed multidisk clutch (F), the ring gear (7) of planetary gear set (P4) transmits the thereby reduced torque and increased rotational speed to the output shaft (19). As a result, the output shaft (19) rotates at an increased input speed in the direction of engine rotation.

Power flow in 8th gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472083Courtesy of MERCEDES-BENZ USA

8th gear power flow 

The following multidisk brakes and multidisk clutches are engaged:

In 8th 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 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. Via the closed multidisk clutch (F), the ring gear (7) of planetary gear set (P4) transmits the thereby reduced torque and increased rotational speed to the output shaft (19). As a result, the output shaft (19) rotates at an increased input speed in the direction of engine rotation.

Power flow in 9th gear, shown on transmission 725.004/008/011/041/044/048/054/058 

G14472084Courtesy of MERCEDES-BENZ USA

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). Via the closed multidisk clutch (F), the ring gear (7) of planetary gear set (P4) transmits the thereby reduced torque and increased rotational speed to the output shaft (19). As a result, the output shaft (19) rotates at an increased input speed in the direction of engine rotation.

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