Patent ID: 6409387
Filing Date: 2002-06-25
Classification: F16C

Abstract:
A ball bushing comprising a cylindrical retainer into which a rod for carrying out a linear motion or a rotational motion can be inserted, a plurality of balls respectively housed for rolling in a plurality of annular grooves cut in said retainer and in rolling contact with said rod, and an outer tube fitted on an outer face of said retainer for retaining said balls from outside, said ball bushing being used in a press-fitted state in a bearing hole of a machine having said rod, whereinsaid outer tube has tapered portions inclined such that diameters of said tapered portions reduce as said tapered portions extend outward respectively at axial opposite end portions of an outer peripheral face, fixed portions having uniform outer diameters and pressed against and fixed to a hole face of said bearing hole respectively in positions adjacent to said tapered portions on insides of said tapered portions, and a smaller-diameter portion having an outer diameter smaller than that of said fixed portions at at least a portion of a tube intermediate portion positioned between said two fixed portions.