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Download Material Engineering Practice IX by Mária Mihaliková and Pavol Zubko PDF

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By Mária Mihaliková and Pavol Zubko

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Nitridation does not cause deformation of the gear rim, so there is no need for finishing operations. e. the input rotation speed nmin = 330 min-1. For the given geometric parameters of the two-stage front gearbox with spur gears for required increased value of power and required lifetime of gearing was performed according to standard STN 01 4686 the strength check of gearing for bending and touch. The some parameters of strength calculation of gearing are in Table 2. By the contractor of the task it was stated, that the gearbox during 16 % of its lifetime runs at minimal input rotation speed.

493 [°] Distance between axes a1 = 450 [mm] a2 = 710 [mm] By change of only geometric parameters of gear box, such as by change of the size of the module (Fig. 2), it is not possible to meet the minimal value of safety factors for bending as well as touch while fulfilling the conditions stated above. It was also necessary to make the change of material of gearing and its heat treatment. Fig. 2 Influence of module on safety factors Influence of materials (characterized by a bending fatigue strength) of the safety factor for the bending transmission is shown in Fig.

493 [°] Distance between axes a1 = 450 [mm] a2 = 710 [mm] By change of only geometric parameters of gear box, such as by change of the size of the module (Fig. 2), it is not possible to meet the minimal value of safety factors for bending as well as touch while fulfilling the conditions stated above. It was also necessary to make the change of material of gearing and its heat treatment. Fig. 2 Influence of module on safety factors Influence of materials (characterized by a bending fatigue strength) of the safety factor for the bending transmission is shown in Fig.

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