Influence of adjustable front ballast on tractor axles balance
2020
Damanauskas, V., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr. (Lithuania)
Ordinarily a tractor works under variable load conditions, what brings unavoidably changing deformations of the tractor front and rear tires, which affects the front and rear axis height. This situation causes problems when the height of the suspended implement must be constant, especially during the crop fertilization operation. The spreader mass is changed from maximum when it is full of fertilizer to minimum when it is empty. The changeable mass of the suspended sprayer induces an uncertain mass centre point of the tractor. Mass transfer changes the height of the tractor axles; with the suspended spreader towards changeable position spreading of fertilizers is inappropriate, because the spread width is unstable. For solving such impact of mass transfer a special attachment of the front ballast with a possibility to change its forward distance was made. The aim of the research was to establish how much the adjustable front ballast can adjust the heights of the front and rear axis of the tractor and to maintain a constant spreader height. The investigative tractor “Ford 8340” and fertilizer spreader “BogballeEX Trend” were used in the research. Mathematical method was applied for the search potential of ballast that can generate an appropriate weight transfer of the front and rear axis load. This study has developed the correlation of the adjustable front ballast and the tractor axle height balance, and spreading quality during the crop fertilizing operation. The results show that the adjustable front ballast can reduce the mass transfer between the tractor axles, compensate the height of the front and rear axis and improve the distribution of fertilizers in the application width by 10−15 % compared to the case when the front ballast was used by default.
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