The shaft shown is simply supported, and rotates at constant speed. The part exi

Question

The shaft shown is simply supported, and rotates at
constant speed. The part exiting the bearing at A takes
only torsional loading. The normal force of contact on
the 7-in-diameter gear is 375 lb, and acts at a pressure
angle of 22°. Details of the shaft layout are shown at A top, and the gear is press fit onto segment B, as shown.

Find the diameter of segment B that would lead to infinite life with a safety factor of 1.5. Use DE-Gerber, and take Se as 25 ksi. Assume well-rounded fillets (Table 7-1), and that notch sensitivities q and qs are both 0.75. The shaft is machined from a material that has tensile strength Sut = 85 ksi, and yield strength Sy = 71 ksi.

A. 1.9 in
B. 1.3 in
C. 0.88 in
D. 0.94 in
E. None of the above

Explanation / Answer

0.94in

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