ANTIFRICTION BEARING DEVICE, HARD DISK DRIVE DEVICE, AND MANUFACTURING METHOD OF ANTIFRICTION BEARING DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent generating of rust while preventing generating of fluctuations in torque and resonant frequency, improve productivity and reduce out gas generation.;SOLUTION: An antifriction bearing device is provided, which comprises two antifriction bearings, each comprising an inner race and outer race that are formed of a metal material containing chrome and carbon and arranged coaxially each other, and a plurality of rolling elements, which are arranged in a circumferential direction with spaces in an annular gap between the inner and outer races, the two antifriction bearings being aligned with a space in an axial direction; and a shaft 31 which is fitted to each of inner races of the two antifriction bearings, where at least the end face of an inner race 21 in an axial direction of at least one of antifriction bearings 20 is coated Z with a material with a melting point higher than 650°C, which can be melted by laser welding; and the end face of the inner race 21 in an axial direction, which is coated with the coating Z, is laser welded to the corresponding shaft 31.;COPYRIGHT: (C)2014,JPO&INPIT