A hub is connected to a shaft with a shrink fit (pressurized oil assembly, grease removed). The material of the hub is quenched and tempered steel (ReH = 450 N/mm2) and the material of the shaft is steel S355. The diameter DF = 30 mm and the length of the D sleeve is l = 30 mm. The outside diameter of the hub is D = 140 mm. Interference fit is
φ30H7/u6 . Surface roughnesses of the shaft and the hub are according to SFS 5595. The
load is pulsating: T = 150 Nm and Fa = 9000 N.
- a) Calculate the safety factor against sliding.
- b) Calculate the safety factor of the hub against the yielding.
- c) Calculate the temperature of the hub at assembly.
- d) Calculate the transmitted torque, if a parallel key (SFS 2636) is used to connect the
hub to the shaft. The key length is 30 mm.
Maybe from a similar problem and only for d)
T = (π/2)⋅DF2⋅lF⋅vru(p/Sr)
The Attempt at a Solution
Sadly, as with my other homework problems, I do not have any formulas or methods showing me how to solve it since the course material is in Finnish.
I can't use the Torque formula either since I don't yet have the safety factors...
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