Patent ID: 9243661
Filing Date: 2016-01-26
CPC Classification: F16C

Claim Text:
1. A six-row ball bearing linear guideway comprising: a rail being an elongated structure extending along a direction X, two directions perpendicular to the direction X being defined as a direction Y and a direction Z which is perpendicular to the direction Y, a cross section of the rail in the direction X being a symmetrical structure with respect to a symmetrical axis, at both sides of the rail with respect to the symmetrical axis being symmetrically provided three rail rolling grooves; a slider including an opening via which the slider is allowed to be slidably sleeved onto the rail, the slider being provided with six slider rolling grooves which are aligned with the rail rolling grooves; a plurality of balls rotatably disposed between the slider rolling grooves and the rail rolling grooves; the linear ball bearing guideway being characterized in that: the three rail rolling grooves are an upper rail rolling groove, a middle rail rolling groove and a lower rail rolling groove which are formed at both sides of the rail with respect to the symmetrical axis, the upper rail rolling groove is located higher than the middle rail rolling groove in the direction Z, and the middle rail rolling groove is located higher than the lower rail rolling groove in the direction Z; and suppose that a profile factor of the respective rail rolling grooves is C, a radius of curvature of cross section profile of the rail rolling grooves is R, and the balls each have a diameter D, and they satisfy the relation: C=(2R−D)/D, the profile factor of the lower rail rolling grooves is smaller than the profile factor of the upper rail rolling grooves.