Torque Converter Component Description - GF27.20-D-2010HAG
TRANSMISSION 722.9 in MODEL 906
View of automatic transmission from front left (shown on automatic transmission with integrated centrifugal pendulum)
Location
The torque converter (B) is located in the transmission bell housing (A) and it is plugged onto the shaft sets of the drive shaft (transmission) (1) and the stator shaft (5).
Task
When the vehicle is stationary and at idle speed, the torque converter (B) reduces the power flow between the engine and transmission to a minimum and increases engine torque while continuously adapting the RPM and torque when the vehicle is driven off.
For an automatic transmission with torque converter and integrated centrifugal pendulum, the fuel consumption can be reduced. Changes in the control system area and the vibration absorption also help to achieve greater shifting comfort, shorter shift transitions and an increase in the service life of the torque converter components.
Design
Sectional view of torque converter with centrifugal pendulum
The impeller (4) is connected to the engine and the turbine wheel (2) to the drive shaft (transmission) (1). The stator (3) is connected to the transmission housing via the freewheel and stator shaft (5).
The oil in the torque converter is continuously exchanged so that heat generated during the operating phase can be drawn away by the transmission oil cooler.
Function
The impeller (4) pumps the oil through the impeller blades outwards to the turbine wheel (2) as a result of the centrifugal force and thus drives the turbine wheel.
The turbine wheel blades direct the oil onto the blades of the stator, which in turn pushes the oil to the impeller (4).
This deflection of the oil onto the stator (3), which is supported against the transmission housing by the overrunning clutch, induces an increase in torque.
Torque conversion is at its maximum value in the stall point, with rotating impeller (4) and stationary turbine wheel (2).
In the individual gear stages, the rotational speed of the turbine wheel (2) equals more and more that of the impeller (4) during the acceleration phase, i.e. the RPM difference is lower until the coupling point reaches almost the same speed. Once the coupling point has been reached, the stator (3) rotates freely.
Illustration shows power flow