Fits for hollow shafts
If bearings are to be mounted with an interference fit on a hollow shaft, to achieve the same surface pressure between the inner ring and shaft seat, it is generally necessary to use a tighter interference fit than would be used for a solid shaft. The following diameter ratios are important when deciding on the fit to be used:
A 6208 deep groove ball bearing with d = 40 mm and D = 80 mm is to be mounted on a hollow shaft with a diameter ratio ci = 0,8. What is the requisite interference and what are the appropriate shaft limits?