| 摘要 |
A ball-screw includes a shaft 1 having two separate helical grooves 3,4 of the same pitch and spaced by half that pitch. The nut 2 includes two corresponding grooves and return bores 5 to define two endless recirculating paths for balls disposed between the nut and shaft. This arrangement permits, for a given groove pitch, the minimum length of the nut to be reduced.
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