Heavy-Duty High Load Precision NJ EM Series Cylindrical Roller Bearing for Gearboxes
Our cylindrical roller bearings are suitable for transmissions, motors, machine tools and heavy industrial equipment, featuring a long service life, reduced maintenance requirements and optimized power transmission performance.
Product Design and Core Specifications
A cylindrical roller bearing is characterized by its cylindrical rolling elements with a length typically greater than their diameter. This linear contact with the raceways, as opposed to the point contact in ball bearings, is the key to its exceptional performance. We offer a comprehensive range of standard types and sizes:
- Standard Series: Includes popular series such as N, NU, NJ, NUP, and NF, each designed for specific internal configurations and axial displacement capabilities (e.g., NU design allows free axial displacement of the shaft).
- Bore Diameter Range: From 20 mm to over 300 mm, catering to a vast spectrum of industrial machinery.
- Precision Classes: Available from standard ABEC 1 (P0) to high-precision ABEC 5 (P5) for applications requiring exceptional running accuracy and minimum vibration.
- Cage Options: Standard cages include high-strength, precision-stamped steel cages for durability and speed. Machined brass or polymer cages are available for specialized high-speed or corrosive applications.
- Internal Clearance: Supplied with standard radial internal clearance (C0, CN), with modified clearance groups (C3, C4) available for applications with specific thermal expansion or fit requirements.
Product Overview：
Our cylindrical roller bearings represent a cornerstone of power transmission design. Engineered to meet rigorous international standards, they excel in applications where managing substantial radial loads is the primary challenge, offering significant advantages over ball bearings in such demanding scenarios.
Key Features:
Exceptional Radial Load Capacity
The primary advantage of a cylindrical roller bearing is its ability to withstand very high radial loads due to the large contact area between the rollers and raceways. This makes them indispensable in heavy-load applications.High Rigidity and Precision
The design provides excellent operational stiffness, minimizing elastic deformation under load. This ensures precise shaft guidance and positioning, which is critical in machine tool spindles and gear systems.Optimized for High Speeds
With low friction and optimized cage designs, our bearings are capable of stable operation at high rotational speeds, making them suitable for applications like electric motor main shafts.Long Life and Durability
Manufactured from vacuum-degassed, high-carbon chromium steel (SAE 52100) and subjected to controlled heat treatment, our bearings achieve an optimal microstructure for high wear resistance and extended fatigue life.- Separable Design for Easy Installation
Most types feature separable components (inner ring, outer ring, and roller-cage assembly), allowing for easy mounting, dismounting, and maintenance, especially in challenging arrangements.
Application Scenarios:
Gearboxes and Drivetrain Systems
In automotive, wind turbine, and industrial gearboxes, handling high radial forces from gears.Electric Motors and Generators
Supporting the main shafts in large industrial motors and generators.Machine Tool Spindles
Providing the rigidity and precision required for machining centers, lathes, and grinders.Material Handling and Construction Equipment
In vibratory screens, conveyor pulleys, and crane wheels where shock loads are common.- Pump and Compressor Shafts
Ensuring reliable performance in fluid handling equipment.
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