| 摘要 |
A four track-type endless rectilinear motion guide unit is provided wherein a slide unit is mounted on a track rail member with a plurality of parallel-arranged cylindrical rollers being intervened therebetween for endless circulation. The four endless circulation passages for rollers, viz., a pair of lower and upper passages on each of the opposing sides of the slide unit, viz., opposing sidewalls of the trackway members are arranged such that as seen in a cross section of the slide unit, their longitudinal axes cross each other at right angles, while the longitudinal lengths of the two endless circulation passages differ from each other so that the longer circulation passage encompasses the shorter circulation passage within the loop, but the lengths of the load carrying trackway surfaces of said two circulation passages are the same. Thus is provided a four track-type endless rectilinear motion guide unit wherein the construction of the slide unit is particularly made simple and compact, while the load capacities of the respective trackways are made equally balanced, yet minimizing the longitudinal length, as a whole, of the endless circulation passages to be formed in the slide unit.
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