SHOP MANUAL MT26/31 - 08.2006 SHOP MANUAL MT26/31 - 08.2006
SHOP MANUAL MT26/31 - 08.2006 SHOP MANUAL MT26/31 - 08.2006
TRANSMISSION
Ch 2 page 136 Ch 2 page 137
TRANSMISSION
TRANSMISSION
Ch 2 page 136 Ch 2 page 137
TRANSMISSION
The stator (reaction member) following the turbine, has the task to reverse the oil, streaming
out of the turbine once more and to deliver it under the suitable discharge direction to the im-peller.
Due to the reversion, the stator is receiving a reaction moment.
The relation turbine moment/impeller moment is called torque multiplication. This is the hig-her,
the greater the speed difference of impeller and turbine wheel will be.
Therefore, the maximum torque multiplication is created at stationary turbine wheel.
With increasing output speed, the torque multiplication is decreasing. The adaption of the output speed to a
certain required output moment will be infinitely variable and automatically achieved by the torque converter.
When the turbine speed is reaching about 80% of the impeller speed, the torque multiplication becomes 1,0 i.e.
the turbine moment becomes equal to that of the impeller 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, in the torque
multiplication range it is backing-up the moment upon the housing, and is released in the
clutch range.
In this way, the stator can therefore rotate freely.
Pressure oil
from the
WK-Valve
Legend ref.
1 = Cup spring
2 = Plate pack
3 =Stator
4 = Circuit cover/Impeller
5 = Turbine wheel
6 = Piston
At closed WK, the slip between impeller and turbine wheel, and with it the hydraulic loss in the converter is
equal to „Zero“ (see Figure WK-open/closed)
The WK will be automatically shifted dependent on the turbine speed.
The pressure oil (12 + 2 bar) for the closing of the WK, is directed via a solenoid shift valve
(see Figure next page) to the piston (6), which is compressing the plate pack.
1 2
4 3
5
6
5
6
1 2
4 3
WK - closed
WK - open
Converter (WK)
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