Power flow in 5th gear, function - GF27.10-P-3015ACS
TRANSMISSION 722.649 in MODEL 216.3 as of Model Year 09 /YoM 08
TRANSMISSION 722.649 in MODEL 221.1 as of Model Year 09 /YoM 08
Sectional view of automatic transmission
Shown here, power flow
Function requirements for power flow in 5th gear, general
- Circuit 87 ON
- Engine running
Power flow in 5th 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 multidisk brakes, overrunning clutches and multidisk clutches are not engaged:
- Multidisk brake B2 (22)
- Multidisk brake B3 (23)
- Overrunning clutch F2 (28)
- Multidisk clutch K1 (24)
In 5th 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 via the blocked freewheel F1 (27) and in deceleration mode via the engaged multidisk brake B1 (21) on the transmission housing. The planet gears (29/2) revolve around the fixed sun gear (29/1) and provide an increase in torque between the ring gear (29/4) and the planet carrier (29/3). The planet carrier (29/3) moves at reduced transmission input speed (B) in the direction of engine rotation.
Rear planetary gear set
The multidisk clutch K2 (25) is engaged and transmits the transmission input speed (B) of the drive shaft (1) to the planet carrier (31/3) via the ring gear (31/4). 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). The sun gear (31/1) moves at increased transmission input speed (B) in the direction of engine rotation.
Center planetary gear set
The ring gear (30/4) turns at the transmission input speed (B) due to the engaged multidisk clutch K2 (25). Due to the connection to the sun gear the multi-disk clutch K3 (26) transmits (31/1) an increased rotational speed to the sun gear (30/1). The planet gears (30/2) turn between the ring gear (30/4) and the sun gear (30/1). The speed of the planet carrier (30/2) and transmission output shaft (5) connected to it is between the ring gear (30/4) and sun gear (30/1). This provides a step-up ratio.