| 摘要 |
A ball bearing for effecting endless linear motion comprising an elongated rod-like insert member and an outer sleeve member for receiving it within its longitudinally extending throughbore, with a plurality of balls intervened on the interface between the two members so as to effect a smooth relative linear motion thereof along their longitudinal axes. On and around the peripheral surface of the rod-like insert member is provided a double thread screw track consisting of adjacent first and second spiral grooves having the same pitch but different cross-sectional depths, while on the innerwall surface of the throughbore of the outer sleeve member is formed a double thread screw track consisting of adjacent first and second spiral grooves which are adapted to mate with the adjacent spiral grooves of the rod-like insert member and which with the aid of ball-reversing U-turn passages attached to connect the adjacent grooves of the outer sleeve member, form an endless spiral groove track for circulating the balls on and through the mating spiral grooves of the assembled rod-like insert member.
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