Tillage Resistance Characteristics of Japanese Rotary Blades

Distribution of Tilling Resistance to the Tipless (Straight) Blade and Bending Tip Portions of a Rotary Blade

Abstract

The main objective of this study is to establish a designing theory for both rotary tiller and tractor mounted with them. In the first step, in order to analyze the dynamic characteristics of rotary tillage equipments especially the tilling resistance of Japanese rotary blades, the distributions of tilling resistance to tipless (straight) blade and bending tip portions were investigated. The rotating resistance force on tipless (straight) blade and bending tip portions, the radial suction force and the centripetal force are explained.
The tillage torque bending for the standard blade can be represented as the composed torque curves of tipless (straight) blade and bending tip portions. The ratio of tilling work (area of torque curve) of bending tip portions to that of the standard blade is defined as “coefficient of torque distribution Z_t of the bending tip portions”. The relationships between this coefficient and the actual tilling pitch p_a, neighboring tilling pitch p_a′, tillage depth H, soil condition S were obtained by using experimental design method.