Three-row Cylindrical Roller Bearings

1. Core Structure: Precision Design for Load Separation​

Three-row cylindrical roller bearings adopt a three-ring separated structure, consisting of core components such as inner ring, outer ring, three rows of rollers, cage (or spacer block) and sealing device. Their structural design enables precise load distribution:​

Load-Bearing Division: Two horizontally arranged rows of rollers are dedicated to withstanding axial loads and overturning moments, while one vertically arranged row of rollers independently bears radial loads. The raceways of the three roller rows are independent of each other to avoid load interference.​

Cage Innovation: A beamless cage design is adopted. The first limit block on the outer ring of the cage and the second limit block on the inner ring directly abut against the end faces of the rollers, eliminating the isolation beams between traditional pockets. This increases the number of arranged rollers by more than 30%, significantly enhancing the load-bearing capacity. Some models are equipped with integral cages or spacers to further optimize the operational stability of the rollers.​

Installation Auxiliary Structure: The bearing rings are pre-provided with evenly distributed mounting holes and positioning screws. Gap-free operation can be achieved through preloading, and the fixing screws can protect the components from damage during assembly and transportation.​

2. Performance Advantages: Precision and Stability Under Heavy Loads​

As one of the slewing bearing types with the strongest load-bearing capacity, its core advantages lie in multi-dimensional performance breakthroughs:​

Super Strong Load-Bearing Capacity: Linear contact replaces the point contact of double-row ball bearings, significantly reducing contact stress. Compared with crossed cylindrical roller bearings, the load distribution on a single roller is more uniform, resulting in the optimal load-bearing capacity under the same boundary dimensions. The comprehensive load-bearing capacity can reach 150 MN, and the maximum axial load can withstand 12,000 kN. For example, the KBMM-225D model (with a diameter of 1200 mm) can easily handle the combined loads of heavy-duty equipment.​

High-Precision Operation: Processed with P4 grade tolerance, the rotation accuracy can reach ±0.01°. Combined with preloading technology, gap-free operation is realized, ensuring precise positioning of equipment in scenarios such as vertical lathe turntables and wind turbine pitch control systems.​

Adaptability to Harsh Working Conditions: High-quality bearing steel is used and undergoes special heat treatment, with a hardness of HRC 58-62. Equipped with high-efficiency sealing devices and pre-reserved lubrication holes, it can work stably in low-temperature environments (-30°C), high-temperature and dusty conditions, and high-vibration environments. For instance, its application in Caterpillar 390F excavators has achieved 12,000 hours of trouble-free operation.​

Low Friction Loss: The optimized roller arrangement and cage design reduce the friction torque. Under grease lubrication, the limiting speed can meet the requirements of medium and low-speed heavy-duty equipment, while reducing operational energy consumption.​

3. Key Parameters: Multiple Specifications for Different Scenarios​

Bearing parameters cover a size range from small-medium to extra-large. The following are examples of core parameters (taking the PSL RT series as an example):

Additional parameters include bolt pre-tightening torque (e.g., up to 284 Nm for M16 specification), number and position of lubrication holes, etc., which can be matched according to equipment requirements.​

4. Application Fields: Core Support for High-End Equipment​

With the characteristics of combined load-bearing and precision operation, it is widely used in high-end equipment fields with low speed and heavy load:​

Construction Machinery: Zoomlion ZCC3200NP crawler crane (supporting 800-ton lifting weight, with an overturning moment of 45 MN·m), slewing mechanism of bucket wheel excavator, steering system of self-propelled modular transporter (SPMT).​

Energy Equipment: Main shaft support of offshore wind turbines above 10 MW, pitch control system of Goldwind GW171-4.5MW wind turbine. The starting torque is ≤5 N·m in -30°C environment.​

Machine Tools and Testing: Vertical lathe/horizontal machining center turntables, high-precision measuring tools. The indexing and positioning function ensures processing and testing accuracy.​

Metallurgy and Mining: Molten steel transfer table, Komatsu PC8000 mining excavator, steering system of mining trucks, which can withstand high-temperature and dusty working conditions.

Hot Tags: three-row cylindrical roller bearings, China three-row cylindrical roller bearings manufacturers, suppliers, factory