Four Point Contact Ball Slewing Bearing

Using a four point contact ball slewing bearing is a common technique that is often used to improve efficiency. The advantages of a four point contact ball slewing Bearing can include a reduction in thrust, moment, and radial load distributions.

Angular contact

Angular contact ball slewing bearings are a type of large bearing that incorporates rotation functions and supporting functions. They are used in many types of machinery, including cranes, ship cranes, aerial work platforms, and excavators. They are also commonly used in material handling equipment and tanks. They have a compact design and are easy to install.

The main features of an angular contact ball slewing bearing include a radial asymmetric race, spacers, and a sealing system. In addition, they can bear both radial and axial loads. The bearing can be adjusted by varying the length of the spacer. The inner and outer ring of the bearing are usually a matched pair.

Depending on the size of the contact angle, the axial load capacity of the bearing increases. The contact angle is the angle between the points of contact of the balls and the raceways in the radial plane.

Radial

Unlike conventional ball bearings, four point contact ball slewing bearing is an angular contact bearing with four points of contact. This bearing is used in a wide range of applications, including turbine generators, tower cranes, wind power generating set, and solar trackers.

This type of bearing is designed to withstand radial and axial loads. It is also capable of handling torque loads. The main features of this bearing are the compact structure and high load carrying capacity. These bearings are suitable for light-duty cranes and mining machinery.

They have advantages over conventional bearings, such as low cost, good accuracy, and minimal space requirement. However, there are some drawbacks, such as increased friction and more skidding on the other contacts.

Generally, radial load bearings are used in situations where the load is predominantly axial. They are not used for high-speed applications.

Thrust

Generally, four point contact ball slewing bearings have a structure of a single row of steel balls. These types of bearings can bear radial and thrust loads. They can also be used to bear overturning moment. They are light in weight and can be manufactured with a compact design. These bearings are commonly used in high-precision radar machinery, cranes, mining equipment, port machinery, construction machinery and more.

The structure of four point contact ball slewing bearings is made up of an inner ring and an outer ring. The inner ring has two radial contact angles. The outer ring has two thrust contact angles. The angular displacements generated by the forces are transferred to the inner ring.

The load in the four point contact ball slewing bearing is mostly carried by the inner ring. The outer ring has an upper raceway arc and a lower raceway arc. The upper raceway arc is defined as the "inner upper" raceway.

Moment

Whether you are building a four point contact ball slewing bearing or a single row slewing bearing, you must be aware of the effects of geometrical parameters on its carrying capacity. By understanding the different effects of the bearing design parameters, you can select the appropriate ones.

In addition to the carrying capacity, the dynamic equivalent load and the bearing life can be calculated using simple equations. The safety factor is also determined through this method. This is especially useful in slow-to-moderate-speed applications.

To calculate the moment of four point contact ball slewing bearing, you must first determine the force distribution of the individual loads. This is done by modeling the rolling element contact mechanics. You will also need to calculate displacements and forces in the bearing.

Load distribution

Whether you are designing a four point contact ball slewing bearing or a slewing ring, you need to understand the influence of several design parameters. By knowing what the effects of these parameters are on the load distribution, you can choose the most reasonable design parameter for your bearing.

One of the first important steps is to investigate the load distribution along the raceways of your bearing. By doing this, you can calculate the internal forces and displacements of your bearing. You also need to know how the contact force is distributed along the bearing. The contact force is a non-linear function of the relative displacement between the ball and the raceway. This is determined by the stiffness of the bearings and the supporting structure.

Several finite element models have been proposed to estimate the deformation of slewing bearings. Using a MATLAB code, you can investigate the effect of various dimensional changes on your bearings.