| Bearing Model |
Bore Diameter (mm) |
Outer Diameter (mm) |
Width (mm) |
Weight (kg) (approx.) |
| NA4906 |
30 |
62 |
27 |
0.22 |
| NA4907 |
35 |
72 |
30 |
0.31 |
| NA4908 |
40 |
80 |
32 |
0.4 |
| NA4909 |
45 |
85 |
34 |
0.47 |
| NA4910 |
50 |
90 |
36 |
0.54 |
Zhejiang Judong Bearings Co., Ltd., established in [2016], is located in Zhejiang Province, China. We are a professional manufacturer and supplier of a wide range of bearing products. Our bearings are widely used in industries such as machinery manufacturing, automotive, electronics, home appliances, and industrial automation.
Needle roller bearings are a special type of rolling bearings. Their main characteristic is the use of slender needle rollers as rolling elements. The following is a detailed introduction to needle roller bearings:
Structure and Composition
Outer Ring: Usually designed with a thin - walled structure, it provides a rolling track for the needle rollers.
Inner Ring: Some needle roller bearings are equipped with an inner ring, while others directly use the shaft as the inner ring.
Needle Rollers: These are slender cylindrical rolling elements with a small diameter and a large length, capable of withstanding high radial loads.
Cage: It is used to fix the position of the needle rollers, ensuring their even distribution and reducing friction.
Sealing Device: Some needle roller bearings are equipped with sealing rings to prevent contaminants from entering and maintain lubrication.
Main Features
High Load - carrying Capacity: The large contact area between the needle rollers and the raceways enables the needle roller bearings to withstand high radial loads.
Compact Design: With small - diameter needle rollers, the overall structure of the bearings is compact, making them suitable for applications with limited space.
Low Friction: The rolling friction between the needle rollers and the raceways is small, resulting in high operating efficiency.
High - speed Performance: Some needle roller bearings are designed for high - speed operation.
Economical: With a simple structure and low manufacturing cost, they offer high cost - effectiveness.
Main Types
Needle Roller Bearings without Inner Ring: They directly use the shaft as the inner ring and are suitable for applications with larger shaft diameters.
Needle Roller Bearings with Inner Ring: Equipped with an inner ring, they are suitable for applications with smaller shaft diameters.
Full - complement Needle Roller Bearings: Without a cage, the needle rollers fill the raceways, providing higher load - carrying capacity but lower rotational speeds.
Thrust Needle Roller Bearings: Used to withstand axial loads and are usually used in combination with other bearings.
Combined Needle Roller Bearings: Combine needle roller bearings with other types of bearings (such as ball bearings) and are suitable for combined loads.
Application Areas
Automotive Industry: Such as gearboxes, engines, and steering systems.
Industrial Machinery: Such as printing machines, textile machines, and packaging machines.
Aerospace: Such as aircraft landing gears and engine components.
Household Appliances: Such as washing machines and air - conditioning compressors.
Power Tools: Such as electric drills and angle grinders.
Advantages
High Rigidity: The large contact area between the needle rollers and the raceways results in high bearing rigidity.
Space - saving: The compact structure makes them suitable for applications with limited space.
Long Service Life: High - quality materials and precise manufacturing processes ensure a long service life for the bearings.
Low Maintenance: With a simple design, they are easy to maintain.
Selection and Installation
Selection Points: Select the appropriate model and size according to factors such as load, rotational speed, and working environment
Installation Precautions
Ensure the shaft and the bearing housing are clean.
Use appropriate tools for installation to avoid damaging the bearings.Regularly check the lubrication condition and replenish or replace the grease in a timely manner.
Maintenance and Upkeep
Regular Lubrication: Select suitable grease according to the operating conditions and replenish or replace it regularly.
Check Sealing: Ensure the sealing device is in good condition to prevent contaminants from entering.
Monitor Operating Status: Regularly check the vibration, temperature, and noise of the bearings to detect and solve problems in a timely manner.Summary
Needle roller bearings, with their high load - carrying capacity, compact design, low friction, and economic efficiency, are widely used in the automotive, industrial machinery, aerospace, and other fields. Whether it is high - load or high - speed operation, needle roller bearings can provide efficient and stable solutions.
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