Patent ID: 8096043
Filing Date: 2012-01-17
Classification: F04B,F16C,H02K,Y10T

Abstract:
1. A method of assembling a pump motor and preloading bearings of the motor, the method comprising the steps of: providing a housing and an end bell for attachment to the housing; providing a first bearing and a second bearing each having a plurality of rolling elements disposed between an inner race and an outer race; providing a rotor assembly comprising a longitudinally-extending shaft; securing the outer race of the first bearing to the housing and securing the outer race of the second bearing to the end bell; providing a spring and assembling the spring on the shaft of the rotor assembly; inserting the rotor assembly into the housing such that a first end of the spring bears against the inner race of the first bearing and a second end of the spring bears against a portion of the rotor assembly; attaching the end bell to the housing such that the shaft is received through the inner race of the second bearing and the spring is compressed and forces the inner race of each of the first and second bearings apart; and subsequent the step of forcing the inner race of each of the first and second bearings apart, securing the inner race of each of the first and second bearings to the shaft to prevent relative motion between each of the inner race of each of the first and second bearings and the shaft.