| 主权项 |
1. A linear motion guide unit comprising: a guide rail having first raceway groove extending lengthwise on each longitudinal side of the guide rail, and a slider that fits over or conforms to the guide rail for movement relative to the guide rail,
the slider being composed of a carriage having a second raceway groove lying in opposition to the first raceway groove on each longitudinal side of the guide rail to define a load-carrying race between the first raceway groove and the second raceway groove and a return passage extending in parallel with load-carrying race, an end cap secured to each opposite end of the carriage and each end cap comprising a turnaround passage to connect the load-carrying race with the return passage, and a plurality of balls for rolling elements disposed to roll through a circulating circuit which is made up of the load-carrying race, return passages, and turnaround passages; wherein the carriage is made up of a flat upper portion spreading above and in opposition to a top surface of the guide rail and side bulges lying on widthwise opposite sides of the upper portion to extend downward alongside of the longitudinal sides of the guide rail and further having the second raceway grooves on inside surfaces thereof, and wherein the flat upper portion of the carriage has threaded holes lying midway between the widthwise opposed bulges to fasten counterparts to the carriage, the carriage having widthwise opposed corners where the flat upper portion merges with the respective bulges, the corners each have therein a lengthwise hole in which a cylindrical porous compact impregnated with lubricant is inserted to extend across a length of the corner, and the bulges of the carriage have threaded holes which are used to fasten the end caps to the fore and aft ends of the carriage. |
