Researches on Increasing the Fatigue Strength of Press-Fit Shaft : 4th Report, Geometry of the End of Press-Fitting and σ _w1

Abstract

The present study is performed to increase the fatigue limit, σ_w1 which is determined from the occurrence of minute cracks at the press-fitted portion. A number of rotating bending fatigue tests are carried out on 50 mm-dia press-fitted shaft assemblies. The results obtained are as follows. (1) In the case of press-fitted assemblies where the hub end face coincides with the shoulder of the fillet of shaft, the fatigue limit, σ_w1, increases with the decrease of fillet radius and with the increase of diameter ratio. (2) Relative slip and the region of fretting corrosion can be decreased with an increase of diameter ratio. (3) Over hanging of the hub over the fillet of shaft can increase σ_w1, and reduce the region of the occurrence of fretting corrosion.