Studies on the Structural Strength of Small Type Tractor (III)

Some Analysis for System of Kinetic Force of Tractor Body

Abstract

Characteristics of vibration at tillage work was found by theoretical calculation of vibrating acceleration at power tiller's body, and compared with load factor. The author applied a motion system of tiller to a substituting matrix system and calculated the deflection at driving point. It was found that there is a particular point in stress, load factor and amplitude within 6-10cm of tilling depth with this tiller. Most effective tillage depth is within 15-20cm, regarding from the aforesaid points, but practically, influence of hardness of soil and reaction of tilling resistance are to be considered.
Next, six formulas was gotten by analysis of system of motion which is accmpanied by working state, but the maximum deflection was produced at the axis of shaft in case of neglecting rolling deflection compared with pitching.
Solving the coalition equation of deflection of each parts of tiller's body, it resulted that the rolling deflection is larger than pitching. Consequently it is considered that rolling performance is the most important.