Linear guide bearing apparatus

A linear guide bearing apparatus, comprising:

• a guide member having a curved circulating path defined by inside and outside curved faces, wherein the guide member has a substantially single circular arc shape;
• a plurality of balls moving along the curved circulating path of the guide member;
• and
• a separator interposed between the adjacent balls such that an axial line of the separator is parallel to or coincides to a straight line combining center points of the adjacent balls, the separator defining concave faces at both ends thereof in the axial direction respectively at least partially contacting spherical surfaces of the adjacent balls,
• wherein an outer diameter of the separator is such that an end of the separator closer to the inner curved face extends towards the inner curved face farther from the outer curved face than a point on the radial line of the separator, said radial line being perpendicular to the axial line and passing through a center of the separator, said point being at a distance from the outer curved face equal to a diameter of the balls, and
• a radius of curvature of the inside curved face is reduced to such a size not as to contact with the separator, and/or a radius of curvature of the outside curved face is enlarged to such a size that the inside curved face does not contact with the separator.