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 96 Ch 2 page 97
TRANSMISSION
TRANSMISSION
Ch 2 page 96 Ch 2 page 97
TRANSMISSION
The six clutches of the transmission are selected via the 6 proportional valves P1 to P6.
The proportional valve (pressure regulator unit) is composed of pressure regulator (e.g. Y6),
follow-on slide and vibration damper.
The control pressure of 9 bar for the actuation of the follow-on slides is created by the pressure reducing valve.
The pressure oil (16+2 bar) is directed via the follow-on slide to the re-spective clutch.
Due to the direct proportional selection with separate pressure modulation for each clutch, the pressures to the
clutches, which are engaged in the gear change, will be controlled. In this way, a hydraulic intersection of the
clutches to be engaged and disengaged will become possible.
This is creating spontaneous shiftings without traction force interruption.
At the shifting, the following criteria will be considered:
- Speed of engine, turbine, central gear train and output.
- Transmission temperature.
- Shifting mode (up-, down-, reverse shifting and gear engagement out of Neutral).
- Load condition (full and part load, traction, thrust, inclusive consideration of load cycles
during the gear change).
The main pressure valve is limiting the max. control pressure to 16+2 bar and releases the
main flow to the converter and lubricating circuit.
In the inlet to the converter, a converter safety valve is installed which protects the converter
from high internal pressures (opening pressure 8,5 bar).
Within the converter, the oil serves to transmit the power according to the well-known hydro-dynamic
principle
See in the section: DESCRIPTION / Function of the Converter.
Electro-hydraulic shift control unit
Transmission control:
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