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Analysis of Improvement of Preload Force of Thrust Spherical Roller Bearings
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In order to ensure the normal operation of the bearing; a certain axial load must be applied; the minimum axial load required is:
Fa mim= Coz/1000
Fa mim-------Minimum axial load (KN)
Coa------------- fundamental extra static load (KN)
In 2004, the 1700 rolling mill of Benxi Iron and Steel Co., Ltd. produced a thrust spherical roller bearing 292/500 bearing; the bearing faced two sets of equipment on the rolling mill support roller; used to receive axial force. It faces the level of the surface. The direction is installed in the bearing seat; to prevent the bearing from being stuck during the operation; after the end plate cover bolt is pressed; then the interval of 0. 2mm or more is released. Together, the thrust bearing is subjected to the radial direction after the bending of the work roll is prevented. Force; between the shaft box hole and the outer diameter of the ring to take > 2mm cooperation gap; under continuous force; more likely to be stuck; even the bearing parts accept part of the impact and damage.
After analysis, I thought that this method of pressing is unreasonable; but I can only find a way to describe the bearing; after discussion; 8 uniform spring holes are drawn on the end face of the bearing race; 8 devices with a diameter of 3 mm Stretch spring; the maximum spring force of each spring is 800 Newtons; thus the bearing device is placed in the bearing seat and pressed against the cover; because the spring force is directly applied to the bearing housing and the cover end face; The neck is not floated when it is displaced to the left and right; it ensures the correct orientation of the roll in the raceway. The roller and the raceway are in an excellent touch condition from start to finish. The pretensioning intention is basically reachable; When the axial force is shaken; the cylindrical shaft in the spring hole first touches the bearing seat and the cover plate under the effect of the spring force; the axial force is buffered; the damage condition of the original bearing is fundamentally solved; the bearing The number of life is greatly extended; satisfied with the user's needs; received favorable comments from users.
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