Patent ID: 6033120
Filing Date: 2000-03-07
Classification: F16C,G11B

Abstract:
A compound bearing assembly for a swing arm of a hard disc drive comprising:a stepped shaft having a large-diameter portion and a small-diameter portion, said large-diameter portion having an inner raceway groove directly formed in the outer periphery;a distinct-component outer race ring disposed around said large-diameter portion and having an outer raceway groove formed in the inner periphery;a plurality of balls provided between said inner and outer raceway grooves;a ball bearing unit having an inner and an outer race ring and a plurality of other balls provided therebetween, said inner race ring being fitted on said small-diameter portion of said stepped shaft; anda sleeve-like spacer surrounding a portion of said stepped shaft between said distinct-component outer race ring and said outer race ring of said ball bearing unit and having opposite end small-diameter portions, said distinct-component outer race ring and said outer race ring of said ball bearing unit being fitted on said opposite end small-diameter portions, respectively;said distinct-component outer race ring, said sleeve-like spacer and said ball bearing unit being thereby integrally assembled on said stepped shaft.