Four-Point Contact Ball Slewing Bearings
Slewing bearing with single-row ball design
The four-point contact ball slewing bearing is designed with rolling elements and raceway for point contact. With compact structure and flexible rotation, the slewing bearing not only can simultaneously withstand axial load, radial load, overturning moment, but also can withstand a single direction load.
A notable advantage of this bearing type is its smaller cross-sectional size and lighter weight compared to other bearings, which doesn't compromise its ability to manage significant loads. Typically, these bearings are made from 42CrMo4 steel with the raceways hardened through an induction process to enhance durability. However, depending on the specific needs of the application, other materials can be used to meet different performance requirements.
ZZ has developed significant expertise in manufacturing four-point contact ball slewing bearings, demonstrating advanced capabilities in both integrated and split structures. Our manufacturing capacity includes producing bearings with an outer diameter of up to 12 meters for integrated structures and up to 20 meters for split structures.
We are also equipped to handle a wide range of gear module sizes, with a maximum module of 45 and a minimum of 4.
(We are capable of customizing non-standard products based on specific customer requirements.)
Slewing bearings are available in three main configurations: external gear, internal gear, and gearless designs. Each of these configurations consists of rings (both inner and outer), steel balls, spacers (also known as bearing cages), and seals. Depending on the application, additional dust-proofing features, such as dust covers or ash shields, can be added.
This type features gear teeth on the outer ring, making it suitable for applications where the gear mesh occurs externally. Due to the external positioning of the gears, this design generally requires more installation space compared to internal gear slewing rings.
In this design, the gear teeth are located on the inner ring, allowing the gear mesh to occur inside the bearing. This configuration is more space-efficient, as it requires less installation space compared to external gear designs, making it suitable for applications where space is limited.
This gearless design features smooth inner and outer rings without any gear teeth. It is typically used in applications where gear interaction is not needed, offering a simpler and more straightforward solution.
Our products are widely utilized in wind turbines, marine equipment, tunnel boring machines, and construction machinery. Notably, our wind turbine products are well-known in the market, where we are recognized for offering turnkey solutions that cater to the unique needs of our clients.
Slewing bearing used in crane
Slewing bearing used in excavator
Slewing bearing used in stacker reclaimer
The double-row ball slewing bearing features a design with two rows of balls, where the rolling elements make point contact with the raceways.
Three-row cylindrical roller slewing bearings is built for applications requiring exceptional load-handling capabilities.
The roller/ball combined slewing bearing integrates both rollers and balls within its structure, providing a balanced approach to load management.
Cross cylindrical roller slewing bearings are designed for applications that demand high rigidity and precise load handling.
Specialists in bearings for wind turbines, marine equipment, and tunneling machines. We deliver quality, expertise, and reliable service.
