Improvement of pre-tightening force of thrust spherical roller bearing

The thrust spherical roller bearing is structurally closed, and the tight ring, the roller and the cage of the bearing are locked by the bushing into a non-separating whole, but the movable ring and the whole are separable. In the lower bearing of the vertical installation, the bearing, the shaft and the self-weight of the other parts on the shaft can be used to form a non-separated state between the tight and the live ring. However, in the vertical installation of the upper and horizontally mounted bearings at both ends, usually after pressing the pressed end cap, the compression bolts are retracted by a certain distance (0.2-1 mm) to avoid too small clearance. The bearing temperature is caused by the running temperature difference. {TodayHot}, however, if the gap occurs, if the gap is too large, the separation between the tight ring member and the ring will be formed, so a reasonable preload can prevent the spin and spin of the rolling element from slipping, and the rolling element can be maintained. The correct position in the raceway.
In order to ensure the normal operation of the bearing, a certain axial load must be applied, and the minimum axial load required is:

Fa mim= Coz/1000

Fa mim-------Minimum axial load (KN)

Coa-------------Basic Static Load Rating (KN)

In 2004, we produced a thrust spherical roller bearing 292/500 bearing for the 1700 rolling mill of Benxi Iron and Steel Co., Ltd., which was installed on the support roller of the rolling mill to support the axial force. It is mounted in the bearing seat horizontally in the face-to-face direction. In order to prevent the bearing from being stuck during operation, after the end plate cover bolt is pressed, the distance of 0.2 mm or more is released. At the same time, in order to avoid the radial force of the thrust bearing after the bending of the work roll, the matching gap between the shaft box hole and the outer diameter of the ring is >2mm, and under the intermittent force, it is more likely to be stuck, and even the bearing parts are replaced. It is damaged by local impact. {HotTag}

After analysis, we believe that this pressing method is unreasonable, but we can only find a way to design the bearing. After research, we designed 8 uniform spring holes on the end face of the bearing race, and installed 8 diameters of 3 mm. The spring, the maximum spring force of each spring is 800 Newtons, so that after the bearing is installed in the bearing housing and pressed against the cover plate, the spring force directly acts on the bearing housing and the cover end face so that the journal is in the direction of the journal. It is not floated when it is displaced left and right, it can ensure the correct position of the rolling elements in the raceway. Keep the roller and the raceway in good contact from beginning to end. The purpose of the pre-tightening can be basically achieved, and when the axial force is applied, the cylindrical shaft in the spring hole first contacts the bearing seat and the cover plate under the action of the spring force, and the axial force is buffered, so that the original bearing is The damage situation has been basically solved, the life of the bearing has been greatly extended, and the user's requirements have been met, which has been well received by users.