Saidullozoda Saivali Saidullo, Davlatshoev Rashid Asankhonovich

Annotation:

The article presents the results of a study on the transmission characteristics of BelAZ-7540А family mining trucks under high-altitude conditions (3500–4500 m above sea level). A comparative analysis of mechanical and hydromechanical transmissions was conducted, taking into account the reduction in engine power and torque, increased oil temperature, and changes in the physical properties of the transmission fluid. The calculated values of the required starting torque were determined, the efficiency of transmissions was evaluated, and the influence of the design parameters of the matching reducer was assessed. It was shown that the use of a hydromechanical transmission with an overdrive or a variator reduces engine load and improves the vehicle’s traction-speed characteristics.

Keywords: mining truck, transmission, hydromechanical drive, high-altitude conditions, torque, efficiency (η), torque converter.