How to optimize slewing bearing performance through installation

Installing a slewing bearing in an appropriate structure is critical to properly distributing bearing loads and stresses. Without adequate construction, bearing performance may be affected. The performance of seals, pinions, gears and bolts is also possible. Therefore, slewing ring installation should be considered early in the design process.

Factors in bearing selection

The designer's first think is of course to specify the dimensions for the slewing ring. Bearing manufacturers can recommend dimensions based on the applied load and ideal mounting conditions. For example, in heavy equipment, the main task of slewing bearings and their mounting structures is to cope with overturning moment loads. Similarly, slewing bearings with integral gears must be selected to ensure adequate slewing gear strength and pinion drive position. Another factor is how large the central opening of the bearing hole should be. This may have as much effect on the bearing size as the maximum applied load.

Matting is another consideration. Although most slewing bearings are sealed by the manufacturer, covers are generally recommended to prevent seal damage and water infiltration. This is especially important if the application involves cleaning with high-pressure water.Picture shows a typical arrangement.

Installation structural integrity

The need for rigidity in the mounting structure cannot be overemphasized. Experienced designers know that they should avoid the use of high-capacity bearings to offset short cuts to fragile mounting surfaces. If the bearing structure is not strong enough to support the bearing evenly and transmit the increased load evenly to the bearing, it cannot compensate for the greater bearing capacity. The consequences may be cleared immediately due to excessive deflection or  rotational resistance. Sometimes they appear later, such as uneven gear wear or reduced performance due to concentrated loads.

In many cases, designers can follow the steel mounting plate thickness recommended by the bearing manufacturer. This type of recommendation is based on the dimensions of rolling elements or circular sections. Another option is a thinner plate reinforced with gussets or channel steel as long as the reinforcement is uniform and has been tested and verified. Avoid using thin "vertical plates" under the bearings. They often provide rigid support only in local areas, which puts more pressure on the fixing bolts and rolling elements.

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