double row ball slewing bearing

Choosing the right slewing bearing is an important decision, because it is not only critical to the performance of the machine, but also to the safety of the operator. There are many different types of slewing bearings, such as single row contact ball slewing bearings, Flange slewing bearings, Light slewing bearings, Cross-Roller Ring slewing bearings, and more.

Light slewing bearing

Compared with a single row ball slewing bearing, the double row ball slewing bearing is bigger in dimension and load capacity. It is especially suitable for loading and unloading machinery and tower cranes.

Double row ball slewing bearings are designed to bear axial and radial load. They have two rows of steel balls with different diameters and can be directly loaded into upper and lower raceways. They are also equipped with three seat-rings. The inner and outer rings are integral. The upper and lower arc raceways have 90deg load-bearing angles. These arcs can bear great axial force and tipping moment.

Another type of double row ball slewing bearings is the one with eight point contact. They have a similar structure to the single row contact ball slewing bearing. These bearings have an improved frictional ratio. However, they require heavy duty.

Unlike the single row ball slewing bearing, these bearings are also more flexible in communication path. They are suitable for light or medium-duty cranes.

Flange slewing bearing

Compared with single row ball slewing bearing, double row ball slewing ring bearing offers good performance when it is fitted into the installation. It can handle axial loads, tilting moment loads and titling loads. The ring can be equipped with different balls of different diameters. It is used in loading and unloading machinery and tower cranes.

The structure of a slewing bearing is composed of an inner ring and an outer ring. The inner ring usually incorporates a gear, while the outer ring is designed to withstand radial forces. The inner ring also includes an oil nozzle and a sealing belt. The outer ring generally features a flange.

Slewing bearings are often used for construction machinery, such as tower cranes and marine cranes. They are also used for transmission machinery, such as wind turbine electrical equipment. They are commonly available in diameters of 3.5 metres or more. In addition, slewing bearings are used in many other industries, such as plastic and rubber machines and the mining industry.

Cross-Roller Ring

Several types of slewing bearings are available in the market. These are designed to carry radial and axial forces. They are widely used in a variety of industries. Their service life depends on the load they are designed for, and the wear they experience on their inner geometry.

One of the most common slewing bearings is the double row ball slewing bearing. It consists of two bearing rings and a ring made of 42CrMo. It is suitable for a number of applications including wind turbine electrical equipment.

Another type of slewing bearing is the cross roller slewing bearing. This slewing bearing features a ring of cylindrical rollers that are arranged crosswise. The ring has a 90deg groove on the outside and a spacer retainer on the inside. This slewing ring is highly robust and is ideal for the swiveling units of industrial robots. Its rigidity is also enhanced by three to four times.

The structure of the slewing bearing is classified into three main types. The first type is the single row contact ball slewing bearing. This type of bearing consists of a row of steel balls that acts as the rolling body. The second type is the double row ball slewing ring. It is a more advanced version of the single row contact ball slewing ring.

Single row contact ball slewing bearing

Usually, the single row contact ball slewing bearing has an outer diameter of 225-870 mm, and a smaller one of 150-480 mm. It has the structure of a mechanical joint, and can be supported by a single isolation block. It can be used to bear axial loads in both directions, and certain moment loads.

The most important performance index for slewing bearings is their carrying capacity. Bearing designers strive to increase their carrying capacity, and optimize their design parameters. These parameters include the contact angle, the contact force, the supporting structure, and the geometrical parameters of the bearing. They are influenced by each other. Several researchers have investigated the effects of these parameters on the load-carrying capacity of slewing bearings.

Some of them focused on the modeling method and the influence of geometrical parameters on the load-carrying capacity. Others used a calculation model to analyze these factors. The influence of the support structure was also investigated.