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Weight Transfer and Traction

# Weight Transfer and Traction - Weight Transfer and Traction...

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1 Weight Transfer and Traction Course 4171 Material in this lecture was taken from chapter 16 of Goreing, Engine and Tractor Power, 1992 Figure 16.1 The center of gravity (CG) can be changed by adding a ballast. A ballast ahead of CG increases X cg A ballast behind CG decreases X cg Common ballast Water with antifreeze in tire (25% air to absorb shock) Rear wheel weights Front end weights Goreing, Engine and Tractor Power, 1992 Center of Gravity Taking moment at A W * X cg = R f * W B Then, X cg = (R f * W B )/W (lbs*in)/lbs Total weight known to be W Front and rear wheel weight measured as Rf and Rb W b = wheel base Xcg = center of gravity Goreing, Engine and Tractor Power, 1992

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2 Weight Transfer Tractor can only produce drawbar load if ground provides a reaction force “Fc” The drawbar load F db is shown at incline so Z r and Z f are different Choose moment about A Change in front and rear wheel reactions as a result of drawbar load. Goreing, Engine and Tractor Power, 1992 Figure 16.2 R f * WB + F db * Z r = W * X cg Solve for R f (Dynamic front wheel reaction) R f = [(W * X cg ) – (F db * Z r )] WB Static front wheel reaction Let F db = 0 (no load) R f0 = (W * X cg ) / WB Goreing, Engine and Tractor Power, 1992 Weight Transfer for Inclined F db Front wheel: R f = R fo - R f = (F db * Z r ) / WB Rear wheel: R r = R r – R ro = (F db * Z f ) / WB By choosing B as center of moment For inclined load, the rear load increases more than the front load decreases For parallel load Z r = Z f , weight transfer > R f = R r
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