1987 Volume 49 Issue 1-2 Pages 109-116
It is considered that when a tractor is working with a rotary tiller, the tillage resistances acting on rotary blades affect the travel of the tractor which has a power source.
The objective of this study is to analyze the effects of rotary tillage resistances to the tractor in a tractor-rotary tilling system. In the Part 1 of this serial report, it was reported that the power transmission system of a riding tractor with a rotary tiller forms a closed-loop, which consists of the “return power”, “traveling power” and “feedback power” etc.
In this report, the power transmission model of both a riding and a walking tractor-rotary tilling system is proposed. Rotary tilling power in tillage pushes the tractor forward, and the driving wheels are preventing the tractor from walking out by their brakig forces. It is explained that the “total braking force” consists of “motion resistance” and “pure braking force”. Then, the theoretical equations of the pure braking force on driving wheels are proposed.
Furthermore, the return power, traveling power and feedback power in the walking tractor with a rotary tiller will be discussed and the theoretical equations of power transmission efficiencies in the closed-loop will be proposed in the following reports.
