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The results of a V-belt drive study, obtained through calculation using the ARM WinMachine system, are presented. During the calculation, depending on the main drive parameters, the program selects the type of V-belt, the number of belts, and presents the results for selection in the form of geometric and force parameters. The industry produces six types of belts for standard cross-sections, differing in size. The wedge height, when transitioning from section 0 (Z) to section D (E) for standard belts, increases and affects the magnitude of bending stresses. The work also provides a comparative assessment of geometric, kinematic, and force parameters with the same characteristics of a flat belt drive. The comparison was made for three V-belts of section 0 (Z) (with approximately equal total contact area in the drives) based on the following parameters: the wrap angle of the driving pulley by the belt, friction forces arising between the belt and the pulley, forces arising in the belt, and coefficients influencing the convergence of calculation results according to Euler's formula and the pulley equilibrium condition, traction capacity, and durability. It was found that for the V-belt drive to operate under otherwise equal conditions, the contact area of a flat belt with the pulley and the belt's initial tension must be greater than in a V-belt drive. In the latter case, a reduced friction coefficient was used in the calculation, which is three times (f*≈3f) higher than the friction coefficient for flat belt drives. In a V-belt drive, the side surfaces of the belt are working surfaces, and the belt moves in the pulley grooves in both axial and radial directions. Based on the force calculation results, convergence (the smallest relative error not exceeding 4%) of the results in a V-belt drive is achieved at f=0.35 and a slip arc αc=0.7α. The traction coefficient for a V-belt drive is almost 2.8 times higher than that of a flat belt drive and is φ0=0.7 (which corresponds to permissible values). The low traction coefficient of a flat belt drive indicates a low efficiency and ineffective transmission. The parameters listed above affect belt durability. The literature provides data that for classic V-belts operating at capacities up to 5 kW, the duration of normal operation is 18,000-24,000 hours (for comparison, the durability of a flat belt is 1,000-5,000 hours). The significant difference in operating time can be explained by the working conditions and the use of multiple belts, which have a fatigue strength that is 1.3 times higher than that of flat belts.
V-BELT DRIVE, BELT TYPE, CALCULATION, FLAT BELT DRIVE, COMPARATIVE ANALYSIS



