GF27.20-P-5102CWQ Torque Converter Lockup Clutch, Component Description

GF27.20-P-5102CWQ Torque Converter Lockup Clutch, Component Description
- TRANSMISSION 722.9 in MODEL 204.0 up to Model Year 8





1 Input shaft
2 Turbine wheel
3 Stator
4 Impeller
16a External plate carrier
16b External plate carrier
16c Clutch pack
16d Pistons
17 Torque converter housing

Location

The torque converter lockup clutch is integrated in the torque converter.

Task

The torque converter lockup clutch minimizes the power losses of the torque converter by reducing converter slip.

The engine speed reduces as a result and the efficiency of the transmission is improved.

Design

The external plate carrier is connected to the impeller via the turbine wheel.





1 Input shaft
2 Turbine wheel
3 Stator
4 Impeller
8 Stator shaft
16a External plate carrier
16b External plate carrier
16c Clutch pack
16d Pistons
16e Torsional damper
17 Torque converter housing

Function

When actuated by the fully integrated transmission control control unit (Y3/8n4), oil pressure controlled by the torque converter lockup clutch control solenoid valve (Y3/8y8) is directed through the input shaft to the pressure chamber behind the piston. The piston presses the clutch pack together and thus enables direct torque transmission between the impeller and turbine wheel.

The torque converter lockup clutch is connected in all gears depending on engine speed and engine load. The torsional damper damps the vibrations coming from the engine. This improves comfort for the driver and saves wear and tear on the mechanical components of the transmission.