Design and development of multipurpose power tiller gear box for paddy cultivation

Abstract

It is found that farmers cultivate small landholdings by traditional method. Further, the total holding of land is not located in one place, rather, it is scattered as split plots in several places. This often restricts power operated tilling, seeding and harvesting machines to perform at optimal efficiency. Even two wheel tractors, reapers and combines face tremendous problems of frequent turnings in such fragmented lands. On the other hand, most of the rural people are poor and hardly can buy a costly machine individually. They use these machines in their own lands and also operate them on hiring basis in others’ lands and earn a substantial return. But, the number of such farmers is limited. Providing efficient and improved small machineries to the present day farmers is the need of the hour. In order to achieve the maximum returns, these small gadgets need to be designed and developed efficiently and tested thoroughly to ascertain their field performance before they reach to the farmers. The proposed idea implements the Vehicle to perform the functions such as tilling, transplanting, harvesting, water pumping, transportation, mud levelling and seed drilling. These functions can be integrated into a single vehicle with multi attachments run with the help of power take off. This project report describes the conceptual design of multipurpose power tiller with tilling, transplanting and harvesting attachment. Simplified transmission system gear box has been designed and analysed based on the region specific requirement on the tiller. Further it details the calculation of required speed ratio and structure of all 1st, 2nd, 3rd, reverse gear and power take off systems designed using CREO-parametric and solid works software. Theoretical stress analysis of the gears is calculated by Lewis bending equation (bending stress), Hertz theory of contact stress and Ansys software to find out the overall robustness of the gear system.