| 摘要 |
A linear ball bearing unit for use in machine tools, transportation robots or the like comprises a bearing body having a pair of skirts with opposed inner surfaces. Ball rolling grooves are formed in both inner surfaces of the skirts and constitute parts of the passageways for loaded balls. Passage bores for non-loaded balls are formed in the central portions of the skirts. The bearing unit further comprises a track shaft which is provided in both side surfaces thereof with recesses in face-to-face relationship with the ball rolling grooves of the skirts thus forming passageways for loaded balls. Lids are attached to both ends of the bearing body and adapted to provide ball turn grooves through which the passageways for loaded balls are connected to corresponding passage bores for non-loaded balls thereby permitting ball trains to be recirculated through the passageways for loaded balls and then through the passage bores for the non-loaded balls. The angle of contact between the loaded balls and the ball-rolling grooves in the bearing body and the track shaft is set to be about 45 degrees.
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