Vario – simple and robust NEW VARIO DRIVE TRAIN FOR THE NEW CLASS The Fendt Vario is a genuine stepless drive. The transmission (ML 160) and rear axle (HA 160) were developed especially for compact heavy- duty tractors. The new drive train boasts an exceptionally compact design and superior per- formance values. The new Tractor Management System co-ordinates the intelligent combination of engine and transmission, which guarantees maximum power transfer, in the field and during haulage. This perfect drive unit featuring superi- or profitability is impressive. Power splitting The engine output is split into a mechanical and a hydrostatic section by a planetary gear.
Only the hydraulic branch controls the system. Both power trains are consolidated in the collecting shaft. the position of the in-unison con- trolled hydrostatic units (pump and motor), the driving speed is regulated steplessly. Mechanical transmission section The mechanical branch also begins at the planetary gear and runs over the mechanical gear connections and the travel range selector to the collecting shaft. Hydraulic transmission section The hydraulic drive unit consists of a hydraulic pump and a hydraulic motor with a unique displacement angle of 45 degrees. Depending on Starting with the Vario When starting, the major part of the engine output flows over the hydro- static branch.
The efficient interplay between the mechanical and hydro- static sections can be recognized by the high acceleration values. The higher the speed of the vehicle, the more the tractive power shifts to the mechanical branch. 8 2 1 torsional vibration damper 2 planetary gear set 3 ring gear 4 sun wheel 5 planet carrier 6 hydraulic pump 7 hydraulic motor 8 collecting shaft 9 travel range selector Forward/reverse travel Changing driving direction is ex- tremely simple with the Fendt Vario concept: the hydraulic pump is just swung out in the opposite direction. No more power draining mechanical forward/reverse shifting.
α = 30 ° 6 1 2 3 4 5 α = 45 ° The secret of the Fendt Vario-Drive Since the Vario drive uses large hydrostatic units, the complete travel speed range from 0.02 to 50 kph can be covered by just 2 travel speeds. This, together with the exclusive 45 degree displacement angle, results in new dimensions in efficiency. At the same time, this concept allows the controls to be simplified, making them failsafe. 8 β = 45 ° 7 750 540 1000 9 I II engine torque hydraulic power transfer mechanical power transfer PTO drive 4-wheel drive 20