Discussions on the Slip-Sinkage of Tractor Drive Wheel (IV)

Abstract

In this paper, the slip sinkage phenomenon of tractor drive wheel was simulated by the logistic curve expressed by the equation (16) and the data obtained from the experiments were compared with the computed results.
The application of that logistic curve to the slip sinkage transient phenomenon of tractor drive wheel at running was quite valid.
In the measurement of the contact pressure of the wheel tread, a small piece of iron beam was used by knowing the deflection of that beam during the rotation of the tested wheel.
The three point moving average method was used to smooth the recorded curve of the slip sinkage of the drive wheel and the curve arranged by that method was drawn by the use of XY plotter under the control of computer.
The following items were obtained through the experiments:
1) Slippage, s has approximately a linear relation to the potential sinkage, h_o. correlation factor between them was 0.67.
The equation expressing the relation between them was
h₀=0.534s-0.465…(33)
2) The maximum contact pressure of the wheel decreases when the total sinkage, h_t increases.
3) The contact angle and the contact length were almost constant in spite of an increase of the sinkage of the wheel.
4) The constant, K₀ decreases with the increase of the sinkage of the wheel.