GF27.10-P-3011ACK Power Flow In 1st Gear, Function

GF27.10-P-3011ACK Power Flow in 1st 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
C 1st gear ratio
D 2nd gear ratio
E 3rd gear ratio
F Stationary parts

Function requirements for power flow in 1st gear, general

^ Circuit 87 ON
^ Engine running

Power flow in 1st gear, general

The drive shaft (1) makes use of all 3 planetary gear sets to increase the torque developed by the torque converter and transmit it to the transmission output shaft (5).

The following multi-disk clutches and multi-disk brakes are not engaged:
- Multidisk clutch K1 (24)
- Multidisk clutch K2 (25)
- Multidisk brake B3 (23)

In 1st gear, 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 ring gear (31/4) rotates at reduced speed due to the mechanical connection to the planet carrier (29/3). The sun gear (31/1) is supported at the housing via the engaged multidisk brake B2 (22), in drive mode, via the locked overrunning clutch F2 (28) and, in overrun mode, via the engaged multidisk clutch K3 (26). The planetary gears (31/2) roll on the fixed sun gear (31/1) and take care of a torque increase when the power is transmitted from the ring gear (31/4) to the planet carrier (31/3). The planet carrier (31/3) moves at reduced speed in the direction of engine rotation.

Center planetary gear set

Due to the mechanical connection the ring gear (30/4) is driven at the same rotational speed as the planet carrier (31/3). The sun gear (30/1) is supported at the housing via the multidisk brake B2 (22).

The planetary gears (30/2) roll on the fixed sun gear (30/1) and take care of a torque increase when power is transmitted from the ring gear (30/4) to the planet carrier (30/3). The transmission output shaft (5) connected to the planet carrier (30/3) turns at a reduced speed in the direction of rotation of the engine.