| 摘要 |
The linear guide system is formed by a tubular body (2) which, internally, has at least three and preferably four guide tracks (33-36, 42, 43) formed, for example, as steel rails (33-36) inserted in an aluminum extrusion which forms the guide body. A slit (7) extends through the outside of the guide body (2); within the guide body, a portion (8) of a carriage is located, which portion includes two bearing elements (11) on either side, formed with two outer tracks (14, 15) for a group of balls (10) to run on the bearing (9) formed by the tracks in the guide body (2) and on the bearing elements (11). To return the balls, upon motion of the carriage, ball return guide elements (24, 25) are located on both ends of the bearing elements (11), and so arranged that they take balls from an upper track (14) and pass them through a duct (16) near the bottom of the bearing element (11). Another set of balls, running on a lower track (15), is returned through an upper duct (17), so that the balls will circulate in loops which, within the ball return guide elements (24, 25) form crossing paths (27, 28) which are separated in space so that the paths (27, 28) do not intersect. This arrangement places the bearings (9) within the tubular body for protection against contamination and provides for a large radius of curvature of the curved portion of the closed-loop paths within the ball return guide elements (24, 25). This permits higher operating speed, while providing for smooth running, and low-noise level.
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