抄録
The traction performance of tractor, especially the mutual relation between the ratio of weight difference on each side of wheels and the ratio of eccentricty l′/l was studied, where l is a half of tread and l′ is the lateral distance from the center of driving axle to the hitch point.
1) When the test tractor is pulled, traction resistance and side force are calculated by the eq. (1) and (2) shown in the report 2 by replaceing the ratio of weight difference λ with the ratio of virtual weight difference λt shown as follows;
λt=λ+0.167V/t
2) When the test tractor is driven, traction force and side force, or driving force are calculated by the equations in the report 2, using the
ratio of virtual weight difference λp, or λd, instead of λ, respectively, The relations between λ and λp, or λd, are as follows;
λp=λ+l′/l/1+l′/lλ
λd=λ-l′/l1-l′/lλ
These equations can be found out easily, imagining the virtual wheel which have the hitch point at the center of the driving axle as mentioned in the report 5.
