| 摘要 |
A linear actuator of the threaded shaft actuator type comprising a rotary threaded shaft and a special bearing unit secured to the member to be moved linearly, in which the bearing unit comprises a plurality of rollers each having a plurality of radial right flanges intermediate their ends spaced apart and scheduled to complement the pitch of the shaft threading for rolling engagement therewith, which rollers at their ends are formed with bearing surfaces that are oblique relative to their axes that ride in spaced apart raceways defined by an outer race structure which in turn is secured to the member to be moved linearly. The rollers are received in non-journaling relation in a roller support that supports the rollers adjacent the respective roller raceways in the event of removal of the bearing unit from the shaft, and keys the rollers against orbiting about the shaft on rotation of the shaft, with the roller support itself being held against rotation about the shaft by connection to the member to be moved linearly but transmitting to such member the desired linear movement which is synchronized with the lead of the shaft threading.
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