How to know the slewing bearing

Slewing bearing, also known as slewing ring, rotating support, also known as turntable bearing, is composed of an inner ring and an outer ring. The inner or outer rings typically contain gears, while both elements contain connection holes, enabling easy and fast connections between adjacent components to optimize power transmission.

These units are designed to transmit axial, radial, and inclined moment loads in a single component, significantly reducing space, weight, and the high cost of investing in other rotational designs. The bearing raceway, combined with the rolling element and cage or spacer, can withstand loads in any direction, either individually or in combination. Slewing supports vary greatly depending on size and bolt hole style, but they can be constructed in the following ways:

1. Internal gear or external gear

2. Ball or cross roller bearing design

3. Single or double row

4. Lubricate holes

That said, the success of slewing bearings is related to how the system is driven, but here are some of the most common types:

Single row

A row of steel balls is the main body, and the steel balls are separated by isolation blocks. The inner and outer rings are key, and the ball is loaded through a jack hole, which means that the ball is in contact with the rolling path at four points and is subjected to axial force, radial force and tipping moment at the same time.

biserial

It is similar to a single-row contact ball slewing bearing, but with two rows of steel balls as rolling elements. All the balls are the same size, and the inner and outer rings are one.

Three rows

It is composed of three rings, distributed horizontally up and down, bearing axial forces and overturning moments (bidirectional). Thus, a third row of vertically arranged rollers is subject to radial forces.

Cross roller type

In this design, the rolling element is a cylindrical roller, and the axes of the adjacent rollers are crossed at 90°. Half of the rollers bear the downward axial force and half bear the upward axial force.

Volleyball pairs

The double volleyball slewing bearing adopts the upper and lower double row steel ball, which has an inner and outer ring, an isolating block and a lubricating device.

How to choose the slewing bearing, you can look at these three technical parameters

Rotary bearings have the characteristics of heavy loads and are commonly used in lifting equipment, excavators, turntables, wind turbines, telescopes and fuel tank turrets. Through the improvement of machining tools and the upgrading of design technology, slewing bearings can be used in smaller Spaces, more complex and more accurate markets.

The correct choice of rotary bearings depends on load, hardness, speed, size and rotary flexibility. Together, the customer and the manufacturer choose the structure to help optimize system performance with the lowest cost and trouble-free operation. Normal load capacity is the main factor in the selection of bearings, but other parameters can also be selected for the appropriate type.

1, when the torque demand is large, it is usually necessary to use double row four-point contact ball bearings

2. Roller bearings are generally used to increase stiffness.

3, in order to maximize bearing capacity, please use cross rollers (two or three rows of roller bearings)

For applications that increase stiffness and load, large size bearings are required, but for applications in sensitive areas, such as robots and controls, smaller size bearings are required. The slewing bearing with small inner diameter weight is reduced. At the same time, the rotational speed is high and the structural deformation needs to be changed accordingly.

Load distribution of slewing bearing

There are many types of slewing supports, from tower cranes to wind turbines, different types of slewing supports: they can have a single volleyball slewing support, a double volleyball slewing support, a row of crossed rollers, two rows of rollers or three rows of waves. Therefore, the slewing support is basically divided into rolling elements (which can be ball slewing supports or rollers) and inner and outer raceways.

The calculation of slewing bearing is based on the theory of slewing bearing calculation. When the size of the slewing support is determined to support the load carried, one of the first criteria used is to limit the contact pressure generated between the rolling element and the raceway.

Therefore, the calculation of static bearing capacity is the basis for specifying the force borne by the rolling element of the heaviest bearing slewing bearing. For this reason, it is necessary to know the force distribution and contact Angle of the rolling element of the slewing bearing.

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