| 摘要 |
The object of the present invention is to convert a rotary motion into a linear motion more precisely than ever by utilizing the principles of a planetary gear mechanism and a differential screw. The rotary/linear motion conversion device of the present invention has a screw shaft 20 , a plurality of planetary screw rollers 36 mating with the screw shaft therearound, and a roller nut 24 , with the screw shaft 20 and the planetary screw rollers 36 mating with one another by threads of opposite winding directions, while the planetary screw rollers 36 and the roller nut 24 mate with one another by threads of a same winding direction, wherein the respective threads are of a common pitch, and the number of co-extending threads of either of the screw nut and the roller nut is varied from that which satisfies the condition that neither of the screw shaft nor the roller nut moves linearly relative to one another in spite of a relative rotation thereof along with rotation and revolving of the planetary screw rollers relative to the screw shaft and the roller nut with no slippage.
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