RESEARCHES REGARDING THE MATHEMATICAL SIMULATION OF KINETOSTATICS OF THE THREE-POINT HITCH COUPLERS USED TO AGRICULTURAL TRACTORS

Abstract

The paper presents an analytical method of the development and of analysis of three-point hitch couplers used to agricultural tractors. As we know, the object of kinetostatics is the study of all forces which acts upon the mechanism elements during their motion. This study is made starting from the following initial data: the kinematic scheme of the mechanism, the geometrical sizes of mechanism elements and the coordinates of kinematic couples. Within the calculations are not taken into account the inertia and the friction forces from the kinematic couples. The mechanism is dived in three kinematic groups. The study and the simulation of kinetostatics mechanism are made for each group depending on the piston position in the lift cylinder of the mechanism. Thus we determine the forces of the kinematic couples in all the mechanism elements, including the force from the piston rod, for each mechanism position, starting with the working position and finishing with the one of transport. We present the results of the researches made upon wheeled tractors U 650 and U 650 DT.