| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary roller screw device capable of preventing the advanced amount of a nut from changing even if a slip occurs at a contact part between a screw shaft and a planetary roller. SOLUTION: In this device, where the effective diameter dn of the contact part between the annular groove of the nut and the annular projected line of the planetary roller is dn, the effective diameter of the contact part of the planetary roller is dr1, the effective diameter of the contact part of a screw shaft is ds, the effective diameter of a contact part between the roller screw shaft of the planetary roller and the shaft screw groove of the screw shaft is dr2, the number of the shaft screw grooves of the screw shaft is Js, and the number of the roller screw grooves of the planetary roller is Jr, andα=dn/dr2 andγ=dr2/dr1 are defined, the effective diameter ds of the contact part is ds=dr1 (α-γ-1) and the number Js of the shaft screw grooves of the screw shaft is Js=Jrα/γ. COPYRIGHT: (C)2006,JPO&NCIPI
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