Heavy-duty Deep Groove Ball Bearing

I. Product Overview​

Heavy-Duty Deep-Groove Ball Bearings (abbreviated as HDDGBB) are a core category within the deep-groove ball bearing family, customized for high-load, high-impact, and harsh operating conditions. They serve as key foundational components for achieving heavy-load transmission in the heavy industry sector. With an outer diameter ranging from 190mm to 400mm and an inner diameter covering 100mm to 200mm, their width is 25%-40% greater than that of medium-duty deep-groove ball bearings. Through a combined design of "thick-walled structure + multi-ball configuration + high-strength materials", they achieve exceptional load-carrying capacity, with a basic dynamic load rating of 180kN-800kN and an impact toughness over 50% higher than that of light and medium-duty bearings.​

Primarily designed to withstand large radial loads, these bearings can also bear bidirectional axial loads equivalent to 30%-40% of the rated radial load. They eliminate the need for additional thrust bearings to meet complex combined load requirements, significantly simplifying the equipment's transmission structure. Compared with light and medium-duty bearings, HDDGBBs undergo targeted enhancements in materials, structure, and sealing, enabling stable adaptation to equipment such as mining machinery, metallurgical equipment, and heavy machine tools-all of which operate in long-term high-load, high-vibration, and dusty environments. This ensures continuous and reliable operation of the transmission system while reducing equipment downtime and failure rates.​

II. Core Structure and Design Features​

1. Precision Structural Composition​

Heavy-Duty Deep-Groove Ball Bearings consist of 4 core components, each optimized for "high load-carrying capacity, strong impact resistance, and harsh environment resistance" to ensure long-term stable operation under heavy-load conditions:​

Inner Ring and Outer Ring: Adopt an extra-thick-walled design, with a wall thickness 25%-40% greater than that of medium-duty bearings with the same inner diameter, effectively enhancing deformation resistance. The preferred material is SUJ2 high-carbon chromium bearing steel (subjected to integral quenching + low-temperature tempering); for extreme heavy-load scenarios, 20CrNiMo alloy carburized steel is used. The surface hardness reaches HRC 62-65, while the core hardness is maintained at HRC 30-35, balancing surface wear resistance and core toughness. The fatigue life is over 60% longer than that of ordinary bearings. The inner diameter of the inner ring and outer diameter of the outer ring typically have precision grades of P6/P5, meeting the installation accuracy requirements of heavy equipment and reducing operational vibration.​

Steel Balls (Rolling Elements): Feature a large-diameter, high-quantity design. The diameter of the steel balls is 30%-50% larger and the quantity is 25%-40% more than that of medium-duty bearings, expanding the contact area with the raceway and distributing load pressure. The steel balls are made of GCr15SiMn high-purity bearing steel, undergoing precision grinding and ultra-fine polishing. The roundness error is ≤ 0.3μm and the surface roughness is Ra ≤ 0.1μm, preventing early spalling caused by local stress concentration. For high-impact scenarios, ceramic-reinforced steel balls (silicon carbide ceramic core + steel outer layer) are used to further enhance impact strength.​

Cage: Abandoning the stamped cages used in light-duty bearings, all HDDGBBs adopt solid cage designs, available in two material types:​

Solid brass cages (HPb59-1 leaded brass), suitable for medium-to-high-speed heavy-load scenarios, offering excellent wear resistance and heat dissipation;​

High-strength cast steel cages (ZG270-500 cast steel), suitable for low-speed extreme heavy-load scenarios, providing strong impact resistance.​

The contact areas between the cage and steel balls undergo arc modification, controlling the friction coefficient between 0.003-0.005 to reduce operational noise and energy loss.​

Seals (Optional): Tailored to the dusty and oily environments of heavy industry, multiple sealing solutions are available:​

① Double-sided steel dust covers (suffix 2Z, thickness 1.5mm-2mm), suitable for dry and clean heavy machine tool scenarios;​

② Double-sided contact seals (suffix 2RS/2RS1): 2RS uses nitrile rubber (NBR), ideal for normal-temperature dusty environments such as mining crushers; 2RS1 uses hydrogenated nitrile rubber (HNBR), with a temperature resistance of up to 150℃, suitable for high-temperature metallurgical equipment;​

③ Double-sided fluororubber seals (suffix 2RS-F), with a temperature resistance range of -20℃ to +200℃, offering oil and chemical resistance, suitable for heavy-duty chemical mixing equipment.​

The fitting clearance between the seals and inner/outer rings is controlled between 0.05mm-0.1mm, achieving an IP65 dust and water resistance rating to effectively block impurity intrusion.​

2. Key Design Characteristics​

Exceptional Load-Carrying Capacity: Through the combined design of thick-walled structures, large-diameter steel balls, and multiple contact points, the basic dynamic load rating reaches 180kN-800kN. For example, Model 6322 (inner diameter 110mm, outer diameter 240mm) has a basic dynamic load rating of 200kN, while Model 6430 (inner diameter 150mm, outer diameter 320mm) reaches 480kN. This enables stable bearing of large radial loads and combined axial loads in heavy equipment, preventing bearing failure due to overloading.​

Strong Impact Resistance: Backed by both high-strength materials and structural design, the impact toughness exceeds 120J/cm², allowing it to withstand instantaneous impact loads (up to 4-6 times the rated load). It is suitable for impact-prone scenarios such as mining crushers and rolling mills, reducing failures like steel ball fragmentation and cage breakage.​

Wide Temperature and Environmental Adaptability: Conventional models operate within a temperature range of -30℃ to +120℃, while fluororubber-sealed models extend this range to -20℃ to +200℃. They exhibit excellent dimensional stability in high-temperature environments, with a rated load attenuation rate ≤ 8%. The outer ring surface can be customized with anti-rust coatings (e.g., Dacromet coating), increasing rust resistance by 80% in humid, high-moisture environments (such as heavy-duty coal washers).​

Easy-Maintenance Lubrication Design: Some models (with suffix /W33) are equipped with an annular oil groove and 4-6 evenly distributed oil holes on the outer ring, with oil hole diameters of 8mm-12mm. This facilitates regular replenishment of lubricating grease (extreme-pressure lithium-based grease or polyurea grease is recommended) via high-pressure lubrication systems, forming a stable oil film. Even during long-term continuous operation (e.g., 24/7 metallurgical rolling mills), real-time lubrication replenishment through oil holes extends maintenance intervals.​

III. Main Product Models and Classification​

1. Classification by Size and Load Rating​

Based on outer diameter and load-carrying capacity, Heavy-Duty Deep-Groove Ball Bearings are categorized as follows to adapt to different heavy-load scenarios:​

2. Classification by Seal and Lubrication Method​

Open Heavy-Duty Bearings (No Suffix): No seals, simple structure, requiring matching with the equipment's built-in sealing system. Suitable for clean scenarios such as heavy machine tool spindles and large gearboxes.​

Heavy-Duty Bearings with Dust Covers (Suffix 2Z): Double-sided thick steel dust covers block dust intrusion and reduce grease contamination. Suitable for heavy motors, fans, and other dry-environment equipment.​

Heavy-Duty Bearings with Contact Seals (Suffix 2RS/2RS1/2RS-F): 2RS (NBR rubber, normal-temperature dusty environments); 2RS1 (HNBR rubber, high-temperature dusty environments); 2RS-F (fluororubber, high-temperature corrosion-resistant environments). Suitable for harsh environments in mining, metallurgy, and chemical industries.​

Heavy-Duty Bearings with Lubrication Grooves (Suffix /W33): Equipped with an annular oil groove and multiple oil holes on the outer ring for continuous lubrication. Suitable for long-term continuous operation equipment such as rolling mill rolls and conveyor drums.​

IV. Applicable Industries and Typical Applications​

With core advantages of "high load-carrying capacity, strong impact resistance, and harsh environment resistance", Heavy-Duty Deep-Groove Ball Bearings are widely used in key heavy industry equipment. Typical applications include:​

Mining Machinery Industry: Spindles of mining crushers (e.g., jaw crushers, cone crushers, suitable for Model 6324/2RS), drive shafts of ball mills (suitable for Model 6428/W33), and drive shafts of vibrating screens (suitable for Model 6322/2RS1), withstanding ore impact and dust contamination.​

Metallurgical Industry: Rolls of metallurgical rolling mills (hot rolling mills, cold rolling mills, suitable for Model 6330/2RS-F, high-temperature resistant and rolling dust resistant), conveyor rolls of continuous casting machines (suitable for Model 6432/W33, continuous heavy-load operation), and bearings of ladle turrets (suitable for Model 6334, extreme heavy loads).​

Heavy Machine Tool Industry: Spindles of heavy lathes (suitable for Model 6326/P5, high precision and medium-to-high speed) and drive shafts of gantry milling machines (suitable for Model 6426/2Z, stable transmission), meeting the load requirements of heavy cutting processes.​

Construction Machinery Industry: Auxiliary bearings for slewing rings of large excavators (suitable for Model 6328, impact resistant), drive shafts of heavy loaders (suitable for Model 6424/2RS, dust resistant), and bearings of vibratory wheels of road rollers (suitable for Model 6332, vibration resistant).​

Other Heavy Industry Sectors: Deck machinery of large ships (suitable for Model 6330/2RS-F, seawater corrosion resistant), heavy forging equipment (suitable for Model 6430, instantaneous impact resistant), and coal mills in thermal power plants (suitable for Model 6328/W33, continuous heavy-load operation).

5. Summary of Product Advantages
Outstanding heavy-load bearing capacity: Thick-walled structure, large-diameter multi-steel ball design, the basic rated dynamic load far exceeds that of light and medium-sized bearings, which can meet the heavy industrial equipment's large-load transmission requirements and avoid frequent replacements due to insufficient load-bearing capacity.
Strong resistance to impact and environmental adaptability: High-strength material, solid cage, and multiple sealing designs can withstand instantaneous strong impacts and resist harsh environments such as dust, high temperatures, and oil contamination, reducing the risk of faults.
Stable and reliable operation: Optimized structural parameters and precise manufacturing processes ensure that the bearings have low vibration and low noise (no-load noise ≤ 55 dB) under heavy-load conditions, with a service life of 30,000 - 50,000 hours, reducing equipment downtime and maintenance time.
Balanced adaptability and economy: Various models, seals, and lubrication solutions can precisely match the needs of different heavy industrial scenarios without overemphasizing extreme configurations; at the same time, mature production processes (automated forging + precision processing) control costs, offering higher cost-effectiveness compared to roller bearings with the same load-bearing capacity, making them suitable for large-scale application in heavy equipment.

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