1988 Volume 50 Issue 6 Pages 11-18
It is considered that the interactions between agricultural wheels and soil surface have to be analyzed carefully for the purpose of deriving design equations for the wheels, especially for deciding the rational shape of wheel lugs.
The objective of this study is to derive design equations for deciding a wheel lug shape. In the first stage to derive them, authors' group observed lug shapes and considered them to be composed of four elements decided by five points in conventional lug shapes. Moreover, the equations for locus curves of these points were derived as the result of the motion analyses of a wheel axle center with “lift reduction” proposed by the authors and “travel reduction”.
These equations are indispensable to the motion analyses of wheel lugs, and thought to be the bases of designing a rational lug shape. The design equations for deciding a rational lug shape obtained from wheel motion analyses will be reported in subsequent papers.
