| 摘要 |
A cross-linear bearing unit for use at an intersection of, for example, a column and a cross rail in a machine tool includes a bearing body (1) having a pair of oppositely facing recesses (10,11) extending orthogonally to one another. The bearing body (1) further has loaded ball guide grooves (16,17,18,19) respectively formed in the inner walls (12,13,14,15) of ridges (24,25,26,27) and non-loaded ball guide bores (20,21,22,23) formed through the ridges. Track rails (40,41) slidably fit in the recesses (10,11) of the bearing body (1). Each track rail is provided in the lateral outer walls thereof with loaded ball raceway grooves (42,43) which are parallel to the corresponding loaded ball guide grooves (16,17,18,19) and provide loaded ball passages therewith. The track rails are guided in the recesses by endless trains of balls circulating through the loaded ball passages and corresponding non-loaded ball guide bores, with which they communicate via end plates providing U-grooves. <IMAGE> |
