| 摘要 |
PURPOSE:To eliminate the need of working a hole, a groove and the like on a flank surface by using a porous body for a fluid supply path confronting with the flank surface of a static pressure screw in the static pressure screw supporting between a male screw and a female screw out of contact by fluid pressure. CONSTITUTION:A nut stored in a case 2 fixes a porous body 11 made of ceramics or the like on a screw base 20 and further the forward end portion 19 made of the same material as that of the base 20 thereon, and forms a screw clearance 8 between a flank surface 9 and a male screw. Further there are provided a connecting hole 12 for supplying fluid pressure from a supply groove 4 of the base 20 to the porous body 11 and a reclaiming hole 7 for reclaiming a fluid from a screw valley portion of the nut to a reclaiming groove 5. In this arrangement, the porous body functions as a passage resistance, and the porous body itself works as a passage, so that it is necessary to work a supply hole and a passage groove on the flank surface so as to easily obtain a static pressure screw, the angle of thread of which is vertical and a static pressure screw made of ceramics.
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