Adjustment of Double Nut Tooth Difference Screw Nut Structure

The structure of single nut processing to adjust the gap has been rare. Currently, the double nut structure is mainly used to eliminate the gap. Although the structure of the double nut tooth difference adjustable ball screw nut pair is more complicated, it is convenient to adjust and operate, and the precise adjustment amount can be obtained through simple calculations. It is currently the most widely used structure. Examples are introduced.

Double nut tooth difference adjustable backlash screw nut pair structure: Figure 1

Figure 1 Structure diagram of double nut tooth difference adjustable screw nut pair

There are cylindrical external gears on the flanges of the two nuts, and the difference in the number of teeth is 1, that is: Z2-Z1u003d1, the number of teeth of the two inner rings is the same, and they are fixed on both ends of the nut with screws and pins. Adjustment When taking out the inner gear ring first, according to the size of the gap, the two nuts are rotated by one tooth or several teeth in the same direction, so that the two nuts are close to each other in the axial direction by a corresponding distance ( Because the difference between the number of teeth on both sides is 1, so the actual turning angle is different). The clearance (△) can be calculated by the following formula; (Guide: Analysis of the problem of screw quality and its cause analysis)

△u003dnt/ Z2 Z1 or nu003d △ Z2 Z1/t

where n-------the number of teeth that two nuts have turned in the same direction;

Z2, Z1 --- the number of teeth of the gear.

The adjustment limit of the ball screw nut pair is to make the CNC machine tool achieve the best state of feed without backlash under the rated full load.

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