Power Flow In 4th Gear, Function - GF27.10-P-3014GRH

TRANSMISSION 724.204 in MODEL 166 

Shown is power flow in 4th gear 

Function requirements for power flow in 4th gear, general 

• Circuit 15 ON
• Combustion engine ON and/or electrical machine (A79/1) ON

Power flow in 4th gear, general 

The following multidisk brakes and multidisk clutches are engaged:

• Multidisk brake B2 (43)
• Multidisk clutch K1 (46)
• Multidisk clutch K2 (47)

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

• Ravigneaux gear set 
• Rear single planetary gear set 
• Front single planetary gear set 

Ravigneaux gear set 

The components of the Ravigneaux gear set are interlocked with each other by the switched multidisk clutch K1 (46) and pass on the transmission input torque and the input speed unchanged to the ring gear (9).

Rear single planetary gear set 

The engaged multidisk clutch K2 (47) means that the rpm of the ring gears (9, 12) are the same. As a result the rear single planetary gear set is locked and not actively involved in the gear ratio.

Front single planetary gear set 

The closed multidisk clutch K2 (47) is used to drive the ring gear (12) with the input speed. The planetary gears (52) roll on the stalled sun gear (14) and transfer the subsequently increased torque and reduced rotational speed to the main shaft via the planet carrier (13). The main shaft therefore rotates in the direction of engine rotation with reduced input speed.