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

GF27.10-P-3014ACK Power Flow in 4th Gear, 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

Function requirements for power flow in 4th gear, general

^ Circuit 87 ON
^ Engine running

Power flow in 4th gear, general

The direct gear ratio of 4th gear (i = 1) means that no torque or speed conversion takes place. Power is transmitted from the input shaft (1) via the 3 blocked planetary gear sets to the transmission output shaft (5).

The following multi-disk brakes and overrunning clutches are not engaged:
- Multidisk brake B1 (21)
- Multidisk brake B2 (22)
- Multidisk brake B3 (23)
- Overrunning clutch F1 (27)
- Overrunning clutch F2 (28)

In 4th gear, the power flows through the following gear sets:
^ Front planetary
^ Rear planetary gear set
^ Center planetary gear set

Front planetary gear set

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

Rear planetary gear set

The multidisk clutch K2 (25) is engaged and transmits the transmission input speed of the drive shaft (1) to the planet carrier (31/3) via the ring gear (31/4). Via the mechanical connection to the blocked front planetary gear set the ring gear (31/4) turns at the same rotational speed as the planet carrier (31/3). The planetary gear set is thus blocked and turns as a closed unit.

Center planetary gear set

The ring gear (30/4) turns at the transmission input speed due to the engaged multidisk clutch K2 (25). The multidisk clutch K3 (26) connects the sun gears of the center planetary gear set and rear planetary gear set. Due to the equality of speeds of the ring gear (30/4) and sun gear (30/1) the planetary gear set is locked and turns as a closed unit.