1988 Volume 50 Issue 1 Pages 19-26
The objective of this study is to analyze the power transmission characteristics of a tractor-rotary tilling system and to obtain basic data for designing, testing and using a power tiller. The theories of return power, feedback power and power transmission efficiency in a closed-loop system were analyzed in previous reports. In this report, experiments on the soil bin were carried out and the applications of the feedback power theories were studied.
The experiments were done with a remodeled device of a rotary tiller. The engine torque, rotary tilling torque, driving torgue of wheels and their rpm are measured by use of this device. Then, return power, feedback power, traveilng power and the power transmission efficiency in a closed-loop system of a power tiller are calculated from these experimental data. The comparison between the calculated and measured values is also discussed. It was proved that the driving wheels are driven by not only the power transmitted from the engine, but aslo the feedback power caused by rotay tilling resistances. The equations to calculate optimum mass and engine power from machine specifications and tilling conditions are proposed with transmission efficiency in a closed-loop ststem.
