PREDICTION OF THE MAIN GEAR LIFETIME OF BELAZ DUMP TRUCK AT THE DESIGN STAGE

The purpose of the research is to improve method for calculating lifetime bevel gears with a circular tooth driving axle BELAZ dump truck hydromechanical transmission. An analysis domestic and foreign calculation methods showed that when determining contact stresses in gearing, influence modification side surfaces teeth on magnitude internal dynamic loads not taken into account, which leads significant overestimation calculated during their design. solution problem introduction refinement coefficients traditionally used OJSC “BELAZ”, values are determined according recommendations Gleason company (USA), supplier gear-cutting equipment “BELAZ”. Comparison actual value gear wheels main gear, established results career operation carrying capacity 90 t transmission (about 142,000 km run), using proposed (134,000 run) traditional (167,000 relative error estimating drive truck, by method, about 6 %, one — 15.5%.