Double Row Ball Slewing Bearing

In the production process of slewing ring bearing, whole process inspection is implemented strictly to ensure that each set of products are qualified. For high-precision products, precise grinding is used to effectively control the parameters of ring ellipse, wall thickness and flatness, so as to ensure that the precision of finished products meets the requirements of standards or customer drawings.

The double-row ball gearless slewing bearing is an important mechanical component. Its design feature is that it has two rows of steel balls, which can withstand large axial forces and tipping moments. This product is particularly suitable for medium and large diameter tower cranes, truck cranes and other loading and unloading machinery.

The slewing bearing of loading and unloading machinery, especially the double-row ball slewing bearing, is a high-precision and high-load-bearing mechanical component. This product has a unique structural design and excellent performance characteristics, and plays an indispensable role in various types of loading and unloading machinery.

The double row ball slewing bearing has three seat rings. The steel balls and isolators can be directly arranged into the upper and lower raceways. According to the stress conditions, the upper and lower rows of steel balls with different diameters are arranged. This kind of open assembly is very convenient. The bearing angle of the upper and lower arc raceway is 75 degrees. It can bear a great deal of axial force and overturning moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The axial and radial dimensions of the double row ball slewing bearing are relatively large and the structure is fastened. It is especially suitable for handling tower cranes, truck cranes and other loading machines that require medium or above diameters, military products.
The double-row four-point contact ball slewing bearing structure is similar to the single-row ball slewing bearing, the difference is that it uses two rows of steel balls as rolling elements, the two rows of steel balls have the same size, and a single isolation block is set between the steel balls. The inner and outer rings are integral, and the steel balls are loaded by plugging the holes. It requires a product for a heavy-duty, radially constrained host.
Double row different diameter ball slewing bearing structure is characterized by the upper and lower double-row steel balls, inner and outer rings, isolation blocks and lubrication and sealing devices. However, the double-row different diameter slewing bearing is a three-piece slewing bearing, and its structure is more complicated.

Crane also is known as marine crane, is a large deck machinery on the ship. It is a kind of equipment for loading and unloading cargo on the ship. Hydraulic crane is a kind of equipment for loading and unloading cargo commonly used on the ship. Generally including portal crane, ship unloader, floating crane, etc., commonly used single row four-point ball slewing ring bearing, three rows roller slewing bearing and double row ball slewing ring bearing. These are our regular products, but also our company’s main advantage products.
Among them, Three row roller slewing bearing is the most commonly used one.Three row roller slewing bearing can bear different loads simultaneously. The capacity load is the largest one comparing with other types of slewing bearing. Due to the large dimension and solid structure, it is especially suitable for heavy-duty machineries, such as port crane, ship crane, etc.
At present, our company often provides four-point ball slewing bearing with inner teeth and double row ball slewing bearing with different ball diameters. Generally, we need to provide CCS, ABS, DNV and other classification societies certification. The other is the maintenance and replacement of slewing bearings for cranes on board ships, such as Mitsubishi crane, TSUJI and other brand cranes.
The commonly repaired and replaced models are 013.50.2877 (figure number: ASB-A0057) 023.60.2890 (figure number: 12-MNR1394.87/53), 013.50.2875 (figure number: 62-MNR2850.87/53).
This series of slewing bearings is one of our main competitive products.

In amusement equipment, slewing bearings are used in Ferris wheels, large pendulums, and flying chairs. Broadly speaking, a slewing bearing is a large bearing that can withstand comprehensive loads, and can bear large axial, radial loads and overturning moments at the same time. Slewing bearings generally have mounting holes, internal gears or external gears, lubricating oil holes and sealing devices, so that the design of the main engine can be compact, easy to guide, and easy to maintain.
Ferris wheel usually adopts double row ball slewing bearing. There are two rows of rolling elements, which can bear large axial load, radial load and tilting moment. It rotates flexibly and stably with higher safety factor. For some large ferris wheel, four contact ball slewing bearing is selected too, outer dia is about 4100mm, depth 85mm. Slewing ring bearings used on Ferris/Sky wheels are used with inner rings. In most cases, the bearing should be light enough and safe enough to rotate. The slewing ring bearings used on the Ferris wheel/sky wheel generally require a long service time, so it is also very important for anti-corrosion. If non-standard customization is required, our company can provide technical support such as selection, design, calculation, etc.