17.25 Figure P17.25 shows the load components acting on a helical gear mounted on a sim-...
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17.25 Figure P17.25 shows the load components acting on a helical gear mounted on a sim- ply supported shaft. Bearing B takes thrust. A flexible coupling for transmitting torque attaches to the right end of the shaft. The left end is free. (a) Draw load, shear force, and bending moment diagrams for the shaft, in both the horizontal and vertical planes. Also draw diagrams showing the torsional loading F, = 450 lb Fa = 400 lb 3 in. rad Bearing B Bearing A F, = 800 lb 5 in. 2 in. FIGURE P17.25 and the axial force loading. (The desired diagrams include the seven shown in Figure 17.7c. Add a similar diagram showing axial load, with tension plotted positive and compression negative.) (b) What radial and thrust loads are applied to the bearings? (c) Identify the most critically loaded shaft cross section, and for this location determine the diameter theoretically required for infinite life. Assume that the shaft will be machined from steel having Su = 150 ksi and S, that Kf = 2.0, 1.5, and 2.0 will apply to bending, torsional, and axial loading, respectively, at the critical location. = 120 ksi, and 17.25 Figure P17.25 shows the load components acting on a helical gear mounted on a sim- ply supported shaft. Bearing B takes thrust. A flexible coupling for transmitting torque attaches to the right end of the shaft. The left end is free. (a) Draw load, shear force, and bending moment diagrams for the shaft, in both the horizontal and vertical planes. Also draw diagrams showing the torsional loading F, = 450 lb Fa = 400 lb 3 in. rad Bearing B Bearing A F, = 800 lb 5 in. 2 in. FIGURE P17.25 and the axial force loading. (The desired diagrams include the seven shown in Figure 17.7c. Add a similar diagram showing axial load, with tension plotted positive and compression negative.) (b) What radial and thrust loads are applied to the bearings? (c) Identify the most critically loaded shaft cross section, and for this location determine the diameter theoretically required for infinite life. Assume that the shaft will be machined from steel having Su = 150 ksi and S, that Kf = 2.0, 1.5, and 2.0 will apply to bending, torsional, and axial loading, respectively, at the critical location. = 120 ksi, and
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