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Research on the principle of polished rod-ball bearing transmission
Source: Bearing network time: 2014-10-28
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The layout of the polished rod-ball bearing transmission organization is very simple; only the polished rod, the Nut seat and the four ball bearings that are separated from the left and right are spherical ball bearings. The accuracy level of the ball bearing is only normal, and the inner ring diameter is ground to be symmetrical. The two conical faces; the angle formed by the tapered busbar and the centerline of the bearing and the degree of skew of the inner hole on the nut seat cooperating with the outer ring of the bearing; all are 9°, and the four bearings are separated from above and below Apply pressure in one direction with a disc spring.
The 6007 type bearing of the Italian FAG company used in this layout; the external dimensions are φ35 × φ62×10mm; and the light rod with the outer diameter of 34mm near the 7O001O7 (φ35 xφ62×9mm) and 107 (φ35×φ62×14mm) in China; Quenching and tempering treatment. Because of the one-way force application of the disc-shaped spring, the upper half of the inner ring of the two bearing inner rings and the lower half of the inner ring of the two bearing bearings are separated from the polished rod; and the other half of the inner ring does not have the appearance of the polished rod Touch. Because the outer diameter of the polished rod (φ34mm) is smaller than the inner diameter of the bearing (φ35mm); when the servo motor rotates the polished rod, if it does not consider the influence of factors such as slip; the inner ring of the bearing borrows the friction between the inner cone and the polished rod; Rolling on the polished rod; making the interval of the axial displacement S of the bearing with the nut seat every revolution of the polished rod; and S=πDtg9°=π×34 ×tg9°=16.92mm; very close to the practical feed of the organization ( 16mm). Because the nut seat moves the carriage; thus the rotary motion of the polished rod becomes a linear motion of the carriage. If no disc-shaped spring applies a unidirectional force to the ball bearing; then the transformation of the polished rod can only lead to the inner ring of the bearing Relative to the outer ring; it is impossible to make the nut seat shaft Displacement. When the polished rod is changed in the positive direction; the B-face of the two bearings in the center can move the nut seat to the right; the bearings on both sides do not work, and if the polished rod rotates in the opposite direction, the A-side of the two bearings can be made The nut seat moves to the left; the center bearing does not work. Therefore, the direction of rotation of the polished rod is changed; the carriage can be moved in different directions. The result of selecting four bearings; not only increases the bearing capacity of the tissue; Make the organization evenly stressed and smooth.
The layout of the polished rod-ball bearing transmission pair is very simple; therefore, the price is only one of the very few of the ball Screw pairs. The transmission function is just right; even if 2 to 3 people stand on the carriage; when the light rod is rotated by hand; The ground makes the carriage move in a straight line. Another advantage of this layout is that it has a good overload protection. When the carriage or nut seat is isolated and cannot move; if the polished rod continues to rotate, the bearing only makes a relative transition between the inner and outer rings. Protect the organization from damage. Pure tumbling is impossible; the primary drawback of this layout is that accurate linear feeds are difficult to ensure; they are usually only used in applications where the load is small and the feed requirements are not very accurate. However, if the carriage is equipped with an azimuth detection system; this organization still has its own advantages. At present, this simple transmission organization has been widely used in foreign countries to replace a part of the ball screw pair.
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