GF27.10-P-3030ACK Power Flow In Reverse Gear, Transmission Mode "S", Function
GF27.10-P-3030ACK Power Flow in Reverse Gear, Transmission Mode "S", Function
- TRANSMISSION 722.695 in MODEL 171.4 as of Model Year 09 /Modification Year 08 model refinement package
Sectional view of automatic transmission
1 Input shaft
2 Turbine wheel
3 Stator
4 Impeller
5 Transmission output shaft
16 Torque converter lockup clutch
21 Multidisk brake B1
22 Multidisk brake B2
23 Multidisk brake B3
24 Multidisk clutch K1
25 Multidisk clutch K2
26 Multidisk clutch K3
27 Overrunning clutch F1
28 Overrunning clutch F2
29/1 Sun gear
29/2 Planetary gears
29/3 Planet carrier
29/4 Ring gear
30/1 Sun gear
30/2 Planetary gears
30/3 Planet carrier
30/4 Ring gear
31/1 Sun gear
31/2 Planetary gears
31/3 Planet carrier
31/4 Ring gear
Shown here, power flow
1 Input shaft
2 Turbine wheel
3 Stator
4 Impeller
5 Transmission output shaft
16 Torque converter lockup clutch
21 Multidisk brake B1
22 Multidisk brake B2
23 Multidisk brake B3
24 Multidisk clutch K1
25 Multidisk clutch K2
26 Multidisk clutch K3
27 Overrunning clutch F1
28 Overrunning clutch F2
29/1 Sun gear
29/2 Planetary gears
29/3 Planet carrier
29/4 Ring gear
30/1 Sun gear
30/2 Planetary gears
30/3 Planet carrier
30/4 Ring gear
31/1 Sun gear
31/2 Planetary gears
31/3 Planet carrier
31/4 Ring gear
A Engine speed
B Transmission input speed
C 1st gear ratio
D 2nd gear ratio
E 3rd gear ratio
F Stationary parts
Function requirements for power flow in reverse gear in transmission mode "S", general
^ Circuit 87 ON
^ Engine running
Power flow in reverse gear, transmission mode "S", general
Torque from the torque converter is increased via the drive shaft (1) and all 3 planetary gearsets and transferred with reversed direction of rotation to the transmission output shaft (5).
The following multidisk brakes, overrunning clutches and multidisk clutches are not engaged:
- Multidisk brake B2 (22)
- Overrunning clutch F2 (28)
- Multidisk clutch K1 (24)
In reverse gear with transmission mode "S", the power flows through the following gear sets:
^ Front planetary
^ Rear planetary gear set
^ Center planetary gear set
Front planetary
The input shaft (1) drives the ring gear (29/4). In drive mode, the sun gear (29/1) is supported at the housing via the locked overrunning clutch F1 (27) and, in overrun mode, via the engaged multidisk brake B1 (21). The planetary gears (29/2) roll on the fixed sun gear (29/1) and take care of a torque increase when the power is transmitted from the ring gear (29/4) to the planet carrier (29/3). The planet carrier (29/3) moves at reduced speed in the direction of engine rotation.
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) rotates at reduced speed due to the mechanical connection to the planet carrier (29/3). 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) turns at reduced speed opposite to the direction of engine rotation.
