Product Overview
This page provides a detailed engineering and procurement reference for the 22272 CA/W33, intended for buyers verifying exact bearing specifications and functional interchangeability before ordering.
As a cornerstone of heavy industrial machinery, the 22272 CA/W33 Spherical Roller Bearing is specifically developed by ZQM Bearings to sustain continuous operation in high-stress environments. Primarily used in primary crushers, vibrating screens, and large-scale conveyor systems, this model is the engineering choice for procurement professionals seeking a reliable replacement that meets rigorous ISO standards for load distribution and fatigue resistance. Its dual-row symmetrical roller design allows for substantial radial capacity while simultaneously managing heavy axial forces in either direction, making it an essential component for critical equipment where downtime is not an option.
Design & Engineering Advantages
The 22272 CA/W33 is synthesized from premium vacuum-degassed GCr15SiMn bearing steel. This material selection is a calculated engineering decision to mitigate the risk of fatigue spalling by controlling the oxygen content and minimizing non-metallic inclusions to sub-5 ppm levels. In high-load industrial bearings, steel purity directly correlates to the fatigue limit, and our controlled manufacturing processes ensure that the 22272 CA/W33 maintains superior Hertzian contact stress distribution across the rolling elements.
The internal geometry is optimized with a large (D – d) cross-sectional height, which provides the necessary radial depth to absorb heavy impact loads. The 170 mm width (B) further enhances the load distribution, ensuring the bearing operates within safe fatigue limits even under peak stress. Specifically, the ‘CA’ variant incorporates a machined solid brass cage and symmetrical rollers. This structure provides exceptional shock and vibration stability, as the brass cage offers a lower friction torque and higher thermal stability compared to pressed steel alternatives, preventing cage fracture and premature thermal seizure during continuous operation. Furthermore, the W33 lubrication groove and three holes ensure a continuous supply of lubricant to the contact zones, maintaining a stable boundary lubrication layer.
Key Features
- High-purity vacuum-degassed steel construction for enhanced fatigue resistance.
- Precision-machined solid brass cage for superior structural reliability under shock.
- Integrated W33 relubrication system for continuous boundary lubrication support.
- Optimized internal geometry to compensate for shaft deflection and misalignment.
- Dimensional stability heat treatment for operation in high-temperature industrial zones.
Boundary Dimensions
| Designation | 22272 CA/W33 |
| Bore diameter (d) | 360 mm |
| Outside diameter (D) | 650 mm |
| Width (B) | 170 mm |
Procurement Selection
From a TCO (Total Cost of Ownership) perspective, the procurement of the 22272 CA/W33 represents a strategic decision to prioritize operational uptime in critical industrial machinery. Engineering teams should prioritize this brass-cage model over steel-cage variants for applications involving intense vibration or sudden impact loads, such as primary crushing stages. The functional interchangeability of the 22272 CA/W33 ensures that maintenance crews can perform field replacements without housing modifications. During procurement verification, engineering teams must cross-audit the d/D/B boundary dimensions against original equipment specifications to ensure precise installation fit and load path integrity, matching the dynamic load ratings of Cr=3553 kN required for major industrial systems.
Cross-reference & Replacement
| ZQM Model | Reference Brand | Reference Model | Equivalence Basis |
|---|---|---|---|
| 22272 CA/W33 | SKF | 22272 CA/W33 | Dimensional conformity |
| 22272 CA/W33 | FAG | 22272-E1-XL-M | Installation interchangeability |
| 22272 CA/W33 | NSK | 22272CAMKE4 | Internal geometry compatibility |
ZQM Bearings ensures that our 22272 CA/W33 maintains dimensional consistency with leading international brands. This allows for seamless replacement in existing industrial housings without modifications to shaft or housing abutments. Always verify the calculation factors (e, Y1, Y2) during engineering evaluation to ensure load ratings match the specific application requirements.
Typical Industrial Applications
- Primary Jaw and Cone Crushers
- Heavy-duty Mining Vibrating Screens
- Steel Rolling Mill Drives and Supports
- Large Conveyor Head and Tail Pulleys
- Vertical Raw Mills in Cement Production
Service Life & Reliability
The reliability of the 22272 CA/W33 is grounded in advanced L10 Life Calculation Logic, where the relationship between material purity and dynamic load distribution is maximized. By reducing friction torque through optimized roller-to-raceway contact, the bearing maintains its heat treatment stability, preventing dimensional drift. High-load industrial environments demand that the bearing resists subsurface-initiated fatigue; ZQM achieves this by controlling the ppm level of inclusions, ensuring that the 22272 CA/W33 achieves its full theoretical fatigue life. The robust 5890 kN static load rating (C0) provides a significant safety factor against permanent deformation during stationary impact loads.
Installation & Lubrication Notes
Success in heavy-duty applications depends heavily on precise misalignment compensation. The 22272 CA/W33 can typically accommodate up to 2 degrees of misalignment; however, exceeding this limit results in edge loading and localized stress peaks. Relubrication via the W33 feature is essential for relubrication continuity, following the speed ratings of Grease=500 r/min or Oil=750 r/min to avoid boundary lubrication failure. Incorrect installation, such as excessive heating or improper shaft fit, can lead to thermal seizure or ring fracture, particularly in high-vibration mining environments.
Frequently Asked Questions
How does material purity influence the fatigue resistance of 22272 CA/W33?
Material purity is the primary determinant of the L10 fatigue life in the 22272 CA/W33. By using vacuum-degassed steel, ZQM reduces non-metallic inclusions that otherwise act as stress concentration points under the raceway surface. If inclusions are present, the constant Hertzian contact stress will trigger subsurface cracks, leading to premature spalling. High purity ensures that the 22272 CA/W33 maintains its dimensional stability and load-carrying capacity over the full service cycle.
Why choose a brass cage (CA) instead of a steel cage (CC) for the 22272 model?
The choice depends on the vibration stress of the application. The solid brass cage in the 22272 CA/W33 provides higher structural rigidity and lower friction under extreme shock loads. While CC designs are efficient for low-friction continuous operation, CA designs are the engineering standard for heavy mining and steel mills where shaft deflection and vibration are constant threats. The brass material also ensures better thermal stability, preventing cage-to-roller binding during boundary lubrication phases.
What causes edge loading in spherical roller bearings and how to prevent it?
Edge loading occurs when the shaft deflection exceeds the misalignment compensation capacity of the bearing, typically around 2 degrees. In the 22272 CA/W33, this is mitigated by optimized internal geometry. However, proper installation and housing alignment are critical to ensure that Hertzian contact stress is distributed evenly across the roller length, preventing localized stress peaks and premature fatigue spalling.
What are the critical installation tolerances for the 22272 CA/W33?
Installation of the 22272 CA/W33 requires careful auditing of shaft and housing abutment dimensions. The da min (388 mm) and Da max (622 mm) must be strictly adhered to so the bearing is properly supported. If the housing abutment is too small, the bearing cannot manage the axial load path correctly, leading to localized stresspeaks. Proper clearance optimization during installation prevents thermal expansion from causing early bearing seizure.
How does the 22272 CA/W33 manage heavy axial loads in a vibrating screen?
The 22272 CA/W33 uses two rows of symmetrical rollers and a spherical outer raceway, allowing the load path to be distributed across a wider contact area. Even when the vibrating screen causes significant shaft deflection, the self-aligning design ensures that the load remains centered. The specific calculation factors (Y1=2.6, Y2=3.9) reflect how effectively the bearing converts axial force into radial load distribution, preventing internal stress peaks that cause early failure.
Related Bearing Models
- 22268 CA/W33
- 22276 CA/W33
- 22272 CC/W33
- 22272 CA
- 22372 CA/W33
Technical Support & Global Inquiry
ZQM Bearings supports long-term supply programs for international OEMs and distributors, emphasizing batch-to-batch dimensional consistency and controlled manufacturing processes. Our engineering team focuses on standardized quality control across repeated production batches to ensure consistent fit and performance for overseas shipments.
Standardized export packaging and anti-rust surface treatment are provided for all overseas shipments to maintain the dimensional integrity of your order. ZQM engineers provide 24/7 technical selection support to ensure the selected bearing solution matches your specific industrial application needs. Request a customized quote for bulk orders or OEM-specific bearing requirements to support your high-performance projects.
