| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw device usable over a long period even when a relatively great axial load acts on a planetary roller and it operates thereon from one direction. SOLUTION: In the screw device, the pitch of a roller side screw portion 6 formed on the outer peripheral face of the planetary roller is smaller than the pitch of a screw portion crossing the roller side screw portion 6 and meshing therewith, out of a shaft side screw portion 4 formed on the outer peripheral face of a screw shaft and a nut side screw portion 5 formed on the inner peripheral face of a nut. COPYRIGHT: (C)2009,JPO&INPIT
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