DESIGN METHODOLOGY FOR SPIRAL-BEVEL GEARS OF THE MAIN TRANSMISSION OF HEAVY-DUTY MINING DUMP TRUCKS

The paper presents a methodology for designing large-module spiral-bevel gears of the main transmission of mining dump trucks, which differs from the known ones by recommendations for optimization of gear ratios in general for the transmission and the use of correction factors established by the method of comparative calculations. The proposed engineering methodology for designing spiral-bevel gears can be used for rapid assessment of kinematic and strength parameters of newly designed main gears of drive axles of dump trucks. The calculation of the geometric parameters and strength of the gears of the main transmissions is based on the established empirical relationship between the transverse module mte and the maximum torque of the Мгп on the drive gear. In this case, the maximum torque is selected according to the smaller of the two torque values determined by the torque on the turbine shaft of the torque converter and the torque limited by the traction of the drive wheels with the road. The proposed method is used in the design of the main gears of the hydromechanical transmissions of dump trucks with a lifting capacity of 90 and 135 tons. An example is given for calculating geometric parameters and the strength of spiral-bevel gears of the main transmission of a dump truck with a lifting capacity of 135 tons.