Spherical Roller Bearing
Spherical roller bearings are among the most powerful, durable, and critical components in power transmission systems used across heavy industries. These bearings are specifically designed to withstand extremely heavy radial loads along with simultaneous axial loads from both directions, under severe operating conditions such as shock, vibration, and shaft deflection.
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Deep Groove Ball Bearings
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Self Aligning Ball Bearings
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Angular Contact Ball Bearing
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Thrust Ball Bearings
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Tapered Roller Bearing
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Spherical Roller Bearing
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2 Items
Needle Roller Bearing
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Spherical Roller Thrust Bearings
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Adapter Sleeves
49 Items
Comprehensive Buyer's Guide & Technical Specifications for Spherical Roller Bearings
Spherical Roller Bearings are among the most robust, resilient, and indispensable mechanical components in heavy-duty power transmission systems. Engineered specifically to accommodate exceptionally heavy radial loads alongside simultaneous bi-directional axial loads, they excel in severe operating conditions involving shock loads, high vibration, and shaft deflection. Their inherent self-aligning capability makes them the definitive choice across mining machinery, cement plants, steel mills, heavy industrial gearboxes, belt conveyors, and paper mills.
1. Engineering Anatomy of Spherical Roller Bearings
A standard spherical roller bearing comprises two rows of symmetrical or asymmetrical barrel-shaped rollers, an inner ring featuring two dedicated raceways, an outer ring with a continuous shared spherical raceway, and precision retainers (cages). The spherical geometry of the outer raceway enables the entire assembly—including rollers and the inner ring—to tilt dynamically within defined angular limits without inducing edge stress, disrupting the lubrication regime, or degrading bearing service life.
2. Key Technical Features & Core Advantages
- Superior Self-Aligning Capability: Compensates for both dynamic and static angular misalignments caused by shaft deflection, housing distortion, or installation inaccuracies (typically up to 1.5° to 2.5°).
- Unrivaled Load-Carrying Capacity: Wide line-contact geometry between the barrel rollers and raceways delivers the highest radial load ratings among all standard rolling-element bearings.
- Exceptional Shock & Vibration Resistance: Dependable performance under harsh environmental impact and heavy vibrational forces (e.g., vibrating screens, cone crushers, and ball mills).
- Efficient Lubrication System (W33 Code): Features an annular lubrication groove and three oil discharge ports on the outer ring for uniform lubricant delivery directly into the roller contact zone.
- Extended Service Life in Harsh Duty Cycles: Manufactured from premium, high-purity vacuum-degassed alloy bearing steel (such as 100Cr6) with optimized metallurgical heat treatment for superior fatigue strength.
3. Standard Suffixes & Technical Designations
Precise specification and procurement of spherical roller bearings depend on mastering international standard technical suffixes:
| Suffix / Code | Technical Feature | Engineering Significance & Application |
|---|---|---|
| K | Tapered Bore (Taper 1:12) | Mounted on plain or stepped shafts using adapter sleeves (H-series) or withdrawal sleeves (AH-series). |
| K30 | Steep Tapered Bore (Taper 1:30) | Optimized for extra-wide bearing series (e.g., 240 and 241 series) on heavy-duty industrial shafts. |
| W33 | Lubrication Groove & 3 Holes | Circumferential groove with three feed holes on the outer ring for direct grease/oil replenishment. |
| CC / CCK | Two-Piece Pressed Steel Cage | Features symmetrical rollers and a floating center guide ring; lower friction, optimized for higher speeds. |
| CA / CAK | Machined Solid Brass Cage | High mechanical strength, retention prongs, engineered for intense shock loads and severe vibration. |
| C3 / C4 | Radial Internal Clearance (Greater than Normal) | Compensates for thermal shaft expansion and heavy press fits to prevent internal preloading. |
4. Primary Dimensional Series & Industrial Applications
Spherical roller bearings are standardized across multiple ISO dimensional series to meet varying load-to-space ratios:
- 222 Series (e.g., 22212 to 22240): The most widely utilized series in general industry and split plummer block housings (SN / SNL / SD), offering an optimal balance between speed capability and load rating.
- 223 Series (e.g., 22314 to 22332): Extra heavy-duty series featuring oversized barrel rollers; the primary specification for vibrating screens, hammer mills, and heavy conveyor drive pulleys.
- 213 Series (e.g., 21308 to 21320): Compact cross-section series engineered for machinery with severe radial space constraints.
- Wide Series (230, 231, 232, 240, 241): Designed for ultra-large diameter shafts in wind turbine main shafts, primary rolling mill gearboxes, and continuous casting rollers.
5. Cylindrical vs. Tapered Bore (K) with Adapter Sleeve Assemblies
Spherical roller bearings are manufactured with either a cylindrical bore (for direct interference press-fitting onto stepped shafts) or a tapered bore (K/K30 suffixes). Utilizing tapered bore bearings combined with Adapter Sleeves (H200, H300, H2300, H3100 series) provides decisive operational benefits:
- Flexible axial positioning and rapid installation on commercial smooth (stepped or non-stepped) shafts.
- Accurate adjustment and verification of Radial Internal Clearance (RIC) by monitoring axial drive-up distance and feeler gauge measurements between rollers and outer raceway.
- Significantly faster dismounting and reduced downtime during maintenance overhauls without damaging shaft journals.
6. DKFL & H&K Spherical Roller Bearings: Maximum Reliability in Heavy Industry
Under the manufacturing excellence of Kamyar Gostar Iranian Industrial Group, spherical roller bearings under the premier DKFL and H&K brands are engineered to rigorous international metallurgical standards. Utilizing ultra-clean 100Cr6 bearing steel with dimensional stabilization heat treatment (maintaining geometric stability up to 150°C–200°C), precision-machined heavy brass or pressed steel cages, and standard W33 re-lubrication facilities, these bearings ensure continuous, dependable operation under the most demanding conditions in mining, cement manufacturing, and heavy metallurgy.
Selection & Sourcing Checklist for Spherical Roller Bearings
- ✔ Accurate Load Computation: Verify dynamic radial/axial load ratios to select the correct dimension series (222 vs. 223 series).
- ✔ Vibration Assessment: For severe shock and vibrational duty (e.g., screening equipment), select machined brass cages (CA) with C3 or C4 internal clearance.
- ✔ Shaft Interface Match: Specify whether a plain cylindrical bore or a tapered bore with adapter sleeve is required.
- ✔ Lubrication Strategy: Ensure integration with the W33 feature and use premium EP / Lithium Complex greases to maximize operational reliability.
Contact our engineering and technical support teams today for quotations, technical datasheets, and specialized consultations on the full line of DKFL and H&K Spherical Roller Bearings.