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(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

A

and

B

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

D

, that has a diameter

d=150mm

. The force

F

applied to the gear

D

has an inclination of

20\deg

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

T_(A)

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

S_(y)=415MPa

, an ultimate stress

S_(at )=552

and fatigue limit

S,=280MPa

. 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

d_(i)=30mm

and 4 within an external diameter with

d_(c)=30mm

. 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

x=2

. Use a friction coefficiest between the two flanges

p=0.25

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



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