Question

To improve an engine transmission, a solid shaft will be replaced with a hollow shaft of better-quality steel resulting in an increase in the allowable stress of X%. In order to keep the existing bearings, the new shaft will have the same outside diameter as the existing, solid shaft. Determine:

(a) the bore diameter of the hollow shaft in terms of outside diameter

(b) the weight savings in percentage, assuming that the steel densities of both shafts are identical.

CO5

10

Note: The values of X is to be taken from the following table.

where X=33% (for 10 marks)

To improve an engine transmission, a solid shaft will be replaced with a hollow shaft of better-quality steel resulting in an increase in the allowable stress of X%. In order to keep the existing bearings, the new shaft will have the same outside diameter as the existing, solid shaft. Determine:

(a) the bore diameter of the hollow shaft in terms of outside diameter

(b) the weight savings in percentage, assuming that the steel densities of both shafts are identical.

  

Note: The values of X is to be taken from the following table.

where X=39% (for 10 marks)

  

Answer 1