Four-row Cylindrical Roller Bearings
Amigo four-row cylindrical roller bearings are engineered for precision and durability, available with either a cylindrical or tapered bore, and in open or sealed configurations. These bearings are predominantly utilized for the roll necks of rolling mill stands, calenders, and roller presses, especially suited for applications demanding high rolling speeds due to their interference fit mounting on roll necks.
Designed to handle radial loads exclusively, Amigo four-row cylindrical roller bearings are typically paired with deep groove or angular contact ball bearings, or with tapered roller bearings—either radial or thrust designs—to manage axial loads effectively. This configuration ensures optimal performance in high-demand industrial settings.
- Exceptional High Load Carrying Capacity
Due to their high roller count, four-row cylindrical roller bearings are engineered to handle extremely heavy radial loads efficiently. - Low Friction
(Roller End/Flange Contact Area) The innovative open flange design, in conjunction with the optimized roller end design and surface finish, facilitates the formation of a lubricant film, thereby reducing friction significantly. - Long Service Life
The implementation of a logarithmic roller profile minimizes edge stresses at the roller/raceway contact points and reduces sensitivity to misalignment and shaft deflection, thereby prolonging service life. - Enhanced Operational Reliability
The precision surface finish on the roller and raceway contact surfaces promotes the formation of a hydrodynamic lubricant film, ensuring reliable operation. - Separable and Interchangeable
The components of SKF four-row cylindrical roller bearings are designed to be separable and interchangeable, greatly simplifying mounting, dismounting, and maintenance inspections. - High Speed Capability
The advanced cage designs are optimized for high-speed performance, accommodating rapid accelerations and peak loads efficiently. - Low Cross-Sectional Height
The reduced cross-sectional height allows four-row cylindrical roller bearings to accommodate relatively larger roll neck diameters compared to the roll diameter.
Four-Row Cylindrical Roller Bearings are engineered for substantial radial load capacity and are extensively employed across diverse industries. Their precise construction and versatility render them suitable for a wide array of applications, available in various designs, variants, and sizes. Typical applications include:
- Steel rolling mills
- Paper mills
- Mining machinery
- Continuous casting machines
- Industrial gearboxes
- Large electric motors
- Heavy-duty cranes
- Marine propulsion systems
Four-row Cylindrical Roller Bearings - Designs and Variants
Basic Design Bearings
Four-row cylindrical roller bearings are designed to handle extremely high radial loads in heavy-duty applications. They offer low friction and can accommodate axial displacement, making them ideal for rolling mills and large industrial equipment.
Sealed Bearings
Sealed Four-row cylindrical roller bearings provide protection against contaminants such as dust and moisture, reducing maintenance needs and extending bearing life. These bearings are commonly used in steel mills and environments with heavy contamination.
Variants/Features
Four-row cylindrical roller bearings come in different variants, including those with varying cage materials (steel or brass) and special coatings for increased durability. Features such as optimized roller profiles help improve load distribution and minimize friction, which are essential in high-performance applications like paper mills and mining equipment.
Four-row Cylindrical Roller Bearings Size Chart
| Designation | d [mm] | D [mm] | B [mm] | C [mm] |
|---|---|---|---|---|
| BC4B 322777/HB1 | 350.0 | 500.0 | 410.0 | 410.0 |
| BC4B 326909 A/HA3 | 350.0 | 520.0 | 300.0 | 300.0 |
| BC4B 326909/HA3 | 350.0 | 520.0 | 300.0 | 300.0 |
| BC4-8022/HA1 | 355.6 | 482.6 | 269.87 | 269.87 |
| BC4B 457939 VAA | 356.67 | 550.0 | 400.0 | 400.0 |
| BC2B 320705/VJ202 | 360.0 | 500.0 | 250.0 | 250.0 |
| BC2B 322217/VJ202 | 360.0 | 500.0 | 250.0 | 250.0 |
| BC4B 320989/HA3 | 380.0 | 540.0 | 400.0 | 380.0 |
| BC4B 322264/HB1 | 380.0 | 560.0 | 325.0 | 325.0 |
| 315802/VJ202 | 400.0 | 590.0 | 440.0 | 440.0 |
| BC4-8059 | 400.0 | 560.0 | 300.0 | 300.0 |
| 313513 | 420.0 | 600.0 | 440.0 | 440.0 |
| 313555 B/VJ202 | 420.0 | 580.0 | 320.0 | 320.0 |
| BC4-8037/HA1VA907 | 431.5 | 571.5 | 310.0 | 310.0 |
| BC4B 326361 B/HA1 | 431.5 | 571.5 | 300.0 | 300.0 |
| 635043 | 440.0 | 660.0 | 340.0 | 340.0 |
| 315811 E | 450.0 | 590.0 | 300.0 | 300.0 |
| 315916 A | 460.0 | 650.0 | 424.0 | 424.0 |
| BC4B 322993 A/HA7 | 460.0 | 650.0 | 424.0 | 424.0 |
| BC4-8003/HA1VA907 | 475.0 | 600.0 | 392.0 | 392.0 |
| BC4B 326261/HA1 | 475.0 | 600.0 | 368.0 | 368.0 |
| 319320 | 480.0 | 680.0 | 420.0 | 420.0 |
| BC2B 326196/HA1VJ202 | 487.98 | 637.0 | 350.0 | 350.0 |
| 316083 A | 500.0 | 670.0 | 450.0 | 450.0 |
| 319254/VJ202 | 500.0 | 650.0 | 260.0 | 260.0 |
Recommended Reading
Frequently Asked Questions (FAQs)
Q: What are Four-row Cylindrical Roller Bearings used for?
A: They are primarily used in heavy-duty applications such as rolling mills, paper mills, and large industrial gearboxes that require high radial load capacity.
Q: Can Four-row Cylindrical Roller Bearings handle axial loads?
A: No, they are designed to handle only radial loads. For axial loads, additional bearing types may be required.
Q: What industries commonly use Four-row Cylindrical Roller Bearings?
A: These bearings are commonly used in industries like steel production, paper manufacturing, mining, and cement processing.
Q: What are the advantages of Four-row Cylindrical Roller Bearings?
A: They offer high load capacity, durability under heavy loads, and are designed to withstand harsh conditions in demanding environments like rolling mills.
Q: Are Four-row Cylindrical Roller Bearings suitable for high-speed applications?
A: They are not typically designed for high-speed applications but excel in heavy-load, low-to-moderate speed environments like steel mills.
Q: How are Four-row Cylindrical Roller Bearings lubricated?
A: These bearings typically require oil lubrication to handle the heavy loads and to ensure smooth operation under extreme conditions.
Q: How do I select the correct size of a Four-row Cylindrical Roller Bearing?
A: Consider the load requirements, speed, and space constraints of your application, as well as the operating environment.
Q: Can Four-row Cylindrical Roller Bearings accommodate misalignment?
A: No, these bearings are not designed to handle misalignment. Proper installation and maintenance are crucial to ensure long service life.
Q: What materials are used in Four-row Cylindrical Roller Bearings?
A: They are typically made from high-grade steel for both rings and rollers, with options for advanced coatings for enhanced durability in harsh conditions.