Positioning drive for absorber rods of a nuclear reactor
AssigneeKraftwerk Union Aktiengesellschaft
InventorHeinz Acher
Life of this patent
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Abstract
The invention concerns a positioning drive for absorber rods of a nuclear reactor, of a threaded spindle and traveling nut type. In this positioning drive, rollers are provided the nut, which engage with the threads of the spindle and have an axis extending essentially at right angles to the longitudinal axis of the spindle. Three of the rollers are preferably combined in a traveling-nut housing, by means of anti-friction bearing elements. The positioning speed of such mechanical spindle drives can be increased thereby substantially. The invention is of interest particularly for boiling-water reactors.
Claims9
A nuclear absorber and positioning drive comprising a spindle having a longitudinal axis and at least one screw thread having sides and a crest, said thread being engaged by a traveling nut having anti-friction bearing means engaging said sides;
- wherein the improvement comprises said bearing means comprising at least three rollers having axes at right angles to the spindle's said axis, a traveling-nut housing, and low-friction bearing members journaling said rollers to said housing so that said rollers are interspaced circumferentially around said spindle and so that said rollers are interspaced longitudinally with respect to said axis, said housing containing at least two nut bodies to which said rollers are journaled by said bearing members with at least three of the rollers to each nut body, and means for elastically thrusting said nut bodies apart, said screw thread having a width between adjacent convolutions and said rollers having a diameter, said diameter being smaller than said width.
Dependencies are inferred from the claim text.