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Multi-row cylindrical roller bearings
Main applications
✔ Metallurgical industry: rolling mill, continuous casting machine roller support
✔ Heavy machinery: mining equipment, port cranes
✔ Precision machine tools: high-speed spindles, grinders
✔ Energy equipment: wind turbine gearboxes
Advantages and features
✅ Ultra-high load: multi-row rollers disperse the load and withstand greater radial forces than single-row bearings
✅ High rigidity: Reduce deformation and ensure equipment operation stability
✅ Long life: Optimize force distribution and reduce local wear
✅ High-speed adaptability: Precision cage design to reduce the impact of centrifugal force
✅ Multiple configurations: double row (NN/NNU type), four rows are optional to meet different load requirements
🔧 1. Introduction to multi-row cylindrical roller bearings
Multi-row cylindrical roller bearings adopt a multi-row rolling element design, which significantly enhances the radial load bearing capacity and structural stability, and is particularly suitable for high-load and high-speed operating environments. The main categories are as follows:
Double-row cylindrical roller bearings: two rows of rollers are arranged in parallel, which can cope with large radial force impacts and are commonly used in heavy-duty transmission systems.
Four-row cylindrical roller bearings: four-row roller combination design, specially developed for extreme heavy-duty conditions, typically used in key parts such as metallurgical rolling mills and rolling equipment.
📊 2. Typical specifications and technical parameters
Double-row series
NNU type: inner and outer rings can be separated, easy to install and maintain, and meet high-precision requirements.
NN type: integral outer ring, suitable for stable radial load scenarios.
NNUP type: with self-aligning washers, axial displacement can be fine-tuned to improve system compatibility.
Four-row series
Designed for ultra-heavy loads, such as rolling mill roll neck supports, can withstand severe impacts and continuous high-pressure loads.
🏭 3. Main industrial applications
Metallurgical equipment: rolling mill stands, continuous casting rollers, etc., to ensure high-intensity continuous operation.
Precision machine tools: high-speed spindle units to ensure rotation accuracy and rigidity.
Mining and lifting machinery: to improve the durability of equipment in harsh environments.
❓ 4. Key technical questions and answers
Q1: What are the core advantages of multi-row bearings compared to single-row bearings?
A1: Through the coordinated force of multiple roller rows, the load distribution uniformity is greatly improved, while the anti-deformation ability is enhanced and the service life is extended.
Q2: What is the applicable limit of four-row bearings?
A2: Designed for mega-newton loads such as metallurgical rolling, but forced lubrication and regular maintenance are required to cope with extreme working conditions.
Q3: Key considerations for selection?
A3: It is necessary to comprehensively evaluate the dynamic load factor, speed limit and installation space, and adopt customized solutions when necessary.
Q4: Do we offer common brands to our clients?
A4: Yes, we provide SKF Cylindrical Roller Bearings, KOYO, NSN, FAG, NSK and etc.
✅ 5. Summary of core values
Multi-row cylindrical roller bearings have become the preferred component for heavy-duty industrial equipment due to their modular roller layout. The double-row and four-row structures cover medium-to-high load to ultra-heavy load applications, respectively, and excel in the fields of metallurgy, machine tools and heavy machinery. When selecting a model, it is necessary to combine operating parameters and maintenance conditions to achieve the best performance match.
Please view our Zylinderrollenlager Catalog for more information!