Variable width tillage tool

To ensure the operating efficiency of plowing unit it is required to comply with the specified speed regime of motion and optimal loading of tractor engine. Difference of tractive resistance of soil in different fields creates a situation where it is difficult to select the optimal loading of tractor engine providing constant speed. For example, for the fields with a specific resistance equal to 20 000 and 30 000 newton per square meter, tools with grasp width equal to 2.4 and 1.9 meters respectively are required. The aim of the paper is to find a design scheme of variable width tillage tool, which provides the necessary reliability and reduces the complexity of grasp width regulation. The main research method in achieving this goal is the rational use of condition of external force loading of working organs of tillage tool. The condition of external loading of working organs is investigated. The principal vector and principal moment are accepted as external load equivalents. The conditional center of external soil pressure on working organ is determined by finding the points of intersection of the axis of thrust-and-torque combination with the working surface of plow body. As a result of study, the design scheme of tillage tool that provides the necessary reliability and reduces the complexity of grasp width regulation is proposed. The value of external cutting forces in the obtained scheme is used as a sensor of specific resistance of soil in a specified field and provides the adjustment of grasp width of tool under optimal loading of tractor engine.

hinged connection of working organs, external force loading, thrust-and-torque combination, damper