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If the turbine speed is reaching about 80% of the pump speed, the conversion becomes 1.0 i.e. the
turbine moment becomes equal to that of the pump moment.
From this point on, the converter is working similar to a fluid clutch.
A stator freewheel serves to improve the efficiency in the upper driving range, it is backing up in the
conversion range the moment upon the housing, and is released in the coupling range.
In this way, the stator can rotate freely.
Function of a hydrodynamic torque converter(Schematic view)
From the engine
T
P
Starting
condition
Intermediate
condition
Condition shortly
before the converter
clutch is closed.
Pump wheel
1
1
1
T
= Torque of the pump wheel
P
T
= Torque of the turbine wheel
T
T
= Torque of the reaction member(Stator)
R
T
R
Reaction member
1.5
(Stator)
<1.5
0
3-4
Turbine wheel
T
T
To the gearbox
n
= 0
T
2.5
Machine stopped
n
< n engine
T
<2.5
n
= 0.8n engine
T
1
Turbine wheel is running with
about the same speed as
pump wheel.
D503TM02
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