The thick wall theory also applies to wheel-shaft assemblies where a contact pressure induced on the inner side of a disc and the outer side of a shaft (termed as shrink fitted assembly) would be capable of transmitting power from one component to the oth
engineering
Description
The thick wall theory also applies to wheel-shaft assemblies where a contact pressure induced on the inner side of a disc and the outer side of a shaft (termed as shrink fitted assembly) would be capable of transmitting power from one component to the other. Consider a steel shaft and wheel assembly as shown in Figure 3. The power transmitted through this assembly is 120 kW at a speed of 750 rev/min. The wheel has an outer diameter of 650 mm and the diameter of the shaft is 125 mm. The width of the wheel is equal to the diameter of the shaft.
View of wheel-shaft assembly on rail
- Work out the minimum contact pressure between the shaft and the wheel that allows
power transmission without slip (assuming a coefficient of friction of 0.12).
- Find out the required minimum diametral interference for this purpose.
- Calculate and plot hoop and radial stresses in shaft and wheel throughout the thicknesses (from the centre of shaft to the outer diameter of the wheel.
-Investigate whether this assembly would be possible and recommend the maximum interference that can be allowed when assembling the wheel and shaft pair to avoid plastic deformation (use Tresca as failure theory).
-Investigate the techniques used in practice for shaft-wheel assembly. Identify and explain three methods, supported with images from the internet.
Instruction Files
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