On the Soil Pressure under Tiller Type Garden Tractor Loads during Pull

Abstract

The vertical soil pressure caused by the driving force of tiller was measured by strain gage soil pressure cell. The results of the tests were as follows:
(1) The peak of soil pressure did not appear at the positin where the center of wheel was on the center of cell but it appeared after the wheel passed across the cell.
(2) Increasing the pull of tiller, decreased the soil pressure up to about 20% slippage of wheel and increased the soil pressure above 20% slippage.
(3) The distribution of soil pressure was not symmetrical but it was inclined backward.
(4) The horizontal soil pressure should be measured as well as the vertical soil pressure was measured for studying on the relation bettween the soil pressure and pull.