Based on the loading and strength requirements of shaft-bearing and flange interference fit structure of an automobile water pump

the range of original magnitude of interference is determined by theoretical calculation

and the magnitude of interference is modified with considering the effect of temperature and rotational speed.In addition

the deformation

equivalent stress and contact pressure of the interference structure are analyzed by using the finite element method.The results show that the influence of the centrifugal force on the magnitude of interference can be neglected because the size and speed of the shaft-bearing and flange are both small.Moreover

because there is obvious stress concentration at the both ends of flange contact zone

so the maximum magnitude of interference should be modified by considering the effect on the structural strength.Finally

the reasonable magnitude of interference between shaft-bearing and flange is obtained as 0.013

0

.023mm.