444 Ventil 23 /2017/ 6
MOBILNA HIDRAVLIKA
Hydrostatic transmission design – 
Closed loop forestry trailer assist drive
 1 Aim of the project
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445Ventil 23 /2017/ 6
MOBILNA HIDRAVLIKA
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 2 Input requests
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ding of up to 10m  of logs in one 
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standard trailer solutions
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 3 Transmission solution
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time provide additional tractive ef-
fort according to operator deman-
so-called constant pressure control 
several driving modes:
 transmission is 
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 transmis-
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eling mode
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: transmission needs to provi-
de requested torque  on trailer 
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: transmission needs to 
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tractor demands speed of com-
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pump displacement according 
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nic control unit provides on time 
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centage of additional torque
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ment – in needed pressure level
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pressurized
 4 Hydraulic system
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generate a greater tractive effort in 
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446 Ventil 23 /2017/ 6
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eling state means 
uncontrolled mo-
vement of motor 
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pump is its unique piston – a sliding 
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ter components 
and less tempera-
ccm electro pro-
portional control-
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speed and transmits information to 
pump speed is also important infor-
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to operate in a most optimal spe-
valves
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MOBILNA HIDRAVLIKA
447Ventil 23 /2017/ 6
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nents
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draulic pump and several electro-
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trailer – one for trailer transmission 
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MOBILNA HIDRAVLIKA
448 Ventil 23 /2017/ 6
 5 On field testing
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formances according to initial cal-
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 6 Conclusions
transmission is a proper solution 
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MOBILNA HIDRAVLIKA
449Ventil 23 /2017/ 6
integration of several components 
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Literature
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darski prikolici
 
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MOBILNA HIDRAVLIKA