GF27.10-P-3031ACM Power Flow In Reverse Gear, Transmission Mode C, Function

GF27.10-P-3031ACM Power flow in reverse gear, transmission mode "C", function
- TRANSMISSION 722.643/649
- refinement package
- as of model year 09









Function requirements for power flow in reverse gear in transmission mode "C", general
^ Circuit 87 ON
^ Engine running

Power flow in reverse gear, transmission mode "C" general
Via the drive shaft (1) involving the center planetary gear set and rear planetary gear set the torque coming from the torque converter is increased and transmitted to the transmission output shaft (5) with the opposite direction of rotation.

The following multidisk brakes, freewheels and multidisk clutch are not engaged:

- Multidisk brake B1 (21)
- Multidisk brake B2 (22)
- Overrunning clutch F1 (27)
- Overrunning clutch F2 (28)
- Multidisk clutch K2 (25)

In reverse gear with transmission mode "C", the power flows through the following gear sets:

^ Front planetary
^ Rear planetary gear set
^ Center planetary gear set

Front planetary
The planet carrier (29/3) and sun gear (29/1) are rigidly connected to each other via the engaged multidisk clutch K1 (24). The planetary gear set is thus locked and turns with transmission input speed as a closed unit due to the mechanical connection of the ring gear (29/4) and drive shaft (1).

Rear planetary gear set
The planet carrier is held at the housing by the engaged multidisk brake B3 (23) (31/3). The ring gear (31/4) turns due to the mechanical connection to the locked planetary gear set with the transmission input speed. The planet gears (31/2) turn between the ring gear (31/4) and the sun gear (31/1). Due to the held planet carrier (31/3) a direction reversal takes place so that the sun gear (31/1) turns in the opposite direction to the direction of engine rotation.

Center planetary gear set
The ring gear (30/4) is held via the mechanical connection to the planet carrier (31/3) of the multi-disk brake B3 (23) on the housing. The sun gear (30/1) turns backwards due to the engaged multidisk clutch K3 (26). The planetary gears (30/2) roll on the fixed sun gear (30/4) and take care of a torque increase when the power is transmitted from the ring gear (30/1) to the planet carrier (30/3). The transmission output shaft (5) connected to the planet carrier (30/3) transmission output shaft (5) turns at reduced rotational speed opposite the direction of engine rotation.