Patent ID: 6202306
Filing Date: 2001-03-20
Classification: F16C,Y10T

Abstract:
A method for manufacturing a pre-loaded double-row rolling bearing unit comprising components including a first member having a first peripheral surface formed with a first raceway, a second member being concentric to the first member and having a second peripheral surface that faces the first peripheral surface to be formed with a second raceway facing the first raceway and with a third raceway separated in the axial direction from the second raceway, a third member fitted under a sufficient fitting strength around the first member and at a fitting depth with respect to said first member, supported to be concentric with the first and second members and having a third peripheral surface facing the second peripheral surface to be formed with a fourth raceway facing the third raceway, and a plurality of balls located in double-rows between the first and second raceways and between the third and fourth raceways, wherein a proper pre-load is applied to the respective balls by adjusting the fitting depth of the third member with respect to the first member, and the third member is pushed in the axial direction with respect to the first member to obtain the fitting depth in a length required for the proper pre-load, the method comprising the steps of calculating or measuring a movement resistance force that occurs due to the fit between the first and third members and that resists the pushing movement of the third member in the axial direction, calculating an amount of elastic deformation of the components based on the movement resistance force, and stopping the work of press-fitting the third member when the third member has been moved with respect to the first member in the direction of increasing the pre-load, by a compensation value in length that corresponds to the amount of elastic deformation, further from the position which corresponds to the length required for the proper pre-load.