| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the lubricant shortage and improve the durability by linearly forming a groove along the rectilinear motion direction in a sleeve body inner plane and setting its cross section to such a dimension as holding the lubricant in an outflow prevented state by the gravity using the capillary phenomena. SOLUTION: A guide bush 20 having a polygonal-section through hole is externally fitted around a polygonal shaft part 1 and a roller bearing mechanism 3 faced thereto in a rolling contact state is provided via a retainer 30 having a lot of rollers 31 arranged vertically in series. A groove is linearly formed along the rectilinear motion direction in the center of the each inside plate 21, and the groove width and the groove depth are set to 0.1-0.44 mm and O.5-3 mm respectively so that the liquid lubricant can be held in an outflow prevented state by the gravity using the capillary phenomena. This constitution can fill the groove 4 from its bottom end to its top end with the lubricant of an oil feed pad 5 and feed it to the retainer 30 and the shaft part 1 outer plane 11 via the rollers 31. This constitution can eliminate the supply shortage of the lubricant and improve the durability of the device.
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