| 摘要 |
Apparatus comprising a pair of guide rails and at least one pair of recirculating-ball linear bearing assemblies, for use in frictionlessly moving a table or like object of inverted-U-shaped cross section along a rectilinear support. Rigidly mounted to the opposite sides of the support, the guide rails have each a pair of divergent surfaces each having formed thereon a ball raceway extending longitudinally of the guide rail. The linear bearing assemblies are affixed to the opposed inside surfaces of the table or the like. Each bearing assembly includes a bearing body having a pair of convergent surfaces having formed thereon a pair of ball raceways opposed to the respective raceways on one guide rail. Each bearing body also has two ball return passageways extending longitudinally therethrough. Fastened to the opposite ends of each bearing body, a pair of end covers have formed therein hairpin grooves each intercommunicating one raceway on the bearing body and one return passageway therein to allow recirculation of a group of antifriction balls. A cage guides the groups of balls as they roll between the raceways on each bearing body and the raceways on the opposed guide rail. As viewed cross-sectionally, the raceways on the guide rails and on the bearing bodies are each curved with a radius approximately equal to the radius of each antifriction ball.
|
