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Design and Analysis of Hydrostatic Transmission (HST) system for OFF-Highway vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 21, 2019 by SAE International in United States
Event: NuGen Summit
The development of any country depends on capital energy consumption. Due to technological advancements, people want more comfort and performance with the tractors and at the same time less fatigue and reduced fuel consumption. At present, most of the tractors uses conventional Manual Transmission (MT) as main driveline, though there is research going on, with implementation in few cases, for shifting from conventional MT to advanced transmissions. A Continuously Variable Transmission (CVT) provides Step Lesley an infinite number of effective gear ratios between maximum to minimum value. Hydrostatic Transmission (HST) is one of the types of CVT. HST can improve the fuel efficiency and smooth drivability than a MT without compromising vehicle performance. The development of HST in tractor is less costly as several existing components such as clutch, large number of gears in transmission system can be removed along with reducing of driver fatigue. HST has the ability to adjust engine speed at the point of maximum fuel efficiency for given speed and power requirement. HST includes the combination of at least one hydrostatic pump and one motor. The forward and reverse motion of the tractor depends upon position of the swash plate of pump and motor. Increasing hydraulic flow supplied to the motor leads to increase in the speed of motor and hence speed of the tractor. adjusting control lever handle tractor can be moved in forward and reverse directions. When the swash plate is in neutral position no fluid will flow so tractor stops. This paper explains lay outing, designing of the hydraulic circuit and sizing of various components in HST. In addition, mathematical modelling of the HST is done along with design of swash plate mechanism of the variable displacement pump.