DefinePK

Abstract

The object of study is transmissions of all-terrain vehicles (6x4, 8x8). The purpose of the research is the creation of multi-robotic mechanical transmissions for all-terrain vehicles. The work describes the main technical characteristics of the vehicles, as well as units that are subject to automated control: friction clutch, gearbox and distributor box with electro-pneumatic drives. It represents the basic requirements for robotic units and units with automatic control. The work represents laws for gear-shifting of manual transmissions vehicles and enlarged algorithms of gear -shifting when operating in difficult environmental conditions on the support surface with a high-coefficient of resistance to movement. We‘ve determined forces of the resistance to movement, and the maximum values of decreasing the vehicle speed while shifting gears. We have studied the principle schemes of the robotized manual transmission control. The paper represents mathematical expressions, on the basis of which the basic parameters of the experimental samples of executive mechanisms for transmission units control are determined. It represents the stand for laboratory experimental studies of robotic mechanical transmissions and the results obtained on the stand during the work of the transmission units in the automatic mode. The analyzed parameters when working at the stand is the total time of gear-shifting, the clutch switching (on\off), time and magnitude of pressure increase in the transmission automatic control mechanisms and power transmission control cylinder, time of synchronization, dynamic loads during gear shifting, the overall power losses in the work of transmission units and other parameter. The article describes the results of experimental studies of the work of units and the control units of the robotized manual transmission as part of all-terrain vehicle (6x4) in different driving conditions, including deformable bearing surfaces. It also shows the comparison of calculated data and experimental results obtained on the stand and on the road. It represents conclusions and recommendations on creation of robotic mechanical of multi-speed transmission with automatic control for all-terrain vehicles.