(Solved): 1 Exercise The schematic of a shaft is illustrated in the figure below. The shaft is supported by t ...

1 Exercise The schematic of a shaft is illustrated in the figure below. The shaft is supported by two bearings in points

and

. A power of 90 kW is transmitted through the gear in

, that has a diameter

. The force

applied to the gear

has an inclination of

and, on the other side of the shaft, only the torque

is applied. The rotational speed of the shaft is 2500 rpm . Chose the type and the size of the bearings in A and B, if the life of the shaft is 5000 hours. Make a sketch of the final shape of the shaft consistently with the choosed bearings. 2 Exercise Find out the safety factor with respect to fatigue life of the shaft designed in Exercise 1. The shaft is made of steel with a yielding stress

, an ultimate stress

and fatigue limit

. Use the same loads applied in Exercise 1. 3 Exercise The figure illustrate a flange used to consect two shafts. 8 bolts were used, where 4 are applied within an internal diameter

and 4 within an external diameter with

. The torque transmitted by the two flanges is 700 Nm . Chose the class and the diameter of the screws able to transmit such force with a safety factor

. Use a friction coefficiest between the two flanges

. Specify also the torque to apply to each screw to guarantee the closure.