ENGINEERING APPROACH TO DESIGNING AND CALCULATION OF THE MAIN ELEMENTS OF DRIVE AXLES OF HEAVY-DUTY QUARRY DUMP TRUCKS

The paper considers scientific and engineering aspects of design, optimization, calculation, construction and ensuring manufacturability of production of drive axles of heavy-duty quarry dump trucks. A new method of engineering analysis has been developed for express assessment and limitation of the selection area of the main parameters of gear transmissions of drive axles of BELAZ quarry dump trucks: gear module; number of gear teeth; load on input (output) shafts; maximum rotation frequency of input (output) links; maximum dynamic factor. Distribution of the drive axle gear ratio uвм is made according to the principle of maximizing the torque in the final stage, i.e. in the planetary wheel transmission, which reduces the loads on the differential and axle shafts and their dimensions. When distributing gear ratios, it is necessary to take into account the limitations of ensuring the technological possibility of cutting teeth of bevel gears with a circular tooth of the main transmission on the equipment available at the enterprise. For the first time, the Bbha scheme of a single-row planetary wheel reduction gear with a double-crown satellite has been used on BELAZ extra-large-capacity quarry dump trucks. The adopted design provides an increase in the gear ratio by 1.7...1.8 times compared to a single-row classic Abha planetary reduction gear.