| 摘要 |
PROBLEM TO BE SOLVED: To improve a smoothness in circulation and circular flow of a roller so as to facilitate manufacturing and assembling operations of the roller. SOLUTION: The roller threaded device includes one threaded shaft, one nut, a circular flow path, a straight step, and two circular flow steps. In the roller threaded device, the threaded shaft is provided with depressed spiral grooves having a V-shaped cross-section in its periphery. The nut is treated so as to be inserted by the threaded shaft and is provided, in its inner peripheral surface, with depressed spiral grooves having a V-shaped cross section corresponding to the spiral grooves provided in the threaded shaft. An interior portion of the nut is provided with the circular flow path for connecting both ends of the spiral groove to make up a circular passage. A plurality of rollers are placed which are interposed between the threaded shaft and the nut to smooth a relative motion of both the threaded shaft and nut. The circular flow path comprises one straight step and two circular flow steps. Each of the circular flow steps connects both ends of the straight step and both the ends of the spiral groove to make up a circular circuit. COPYRIGHT: (C)2007,JPO&INPIT
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