Needle roller bearings are roller bearings with cylindrical rollers that are both thin and long relative to their diameter. This type of roller is called a needle roller. Despite its smaller cross-section, the bearing still has a high load-bearing capacity.
Needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest.
It is especially suitable for support structures with limited radial installation dimensions.
The small cross-sectional height of needle roller bearings helps ensure that the entire machine is light and compact. Therefore, they are used in a wide range of applications, including automobiles, motorcycles, motors, machine tools, aerospace equipment, office equipment, and other industrial machinery。
HK1214-RS needle roller bearing product, inner diameter is 12mm, outer diameter is 18mm, thickness is 14mm
Below is the table of HK 1214 needle roller bearing :
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MAIN DIMENSION&PERFORMANCE |
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|
Fw |
12 mm |
Lower Roller Diameter |
|
D |
18 mm |
Outer Diameter |
|
C |
14 mm |
Width |
|
Cr |
6500 N |
Radial Dynamic Load Rating |
|
Cor |
7300 N |
Radial Static Load Rating |
|
Cur |
880 N |
Radial Ultimate Fatigue Load |
|
nG |
12,000 1/min |
Limit Speed |
|
nG Grease |
12,000 1/min |
|
|
Weight |
10.21g |
|
|
DIMENSION PARAMETER |
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|
C1 |
14 mm |
Outer Ring Width |
|
rmin |
0.8 mm |
Minimum Chamfer Size |
|
Working Temperature |
||
|
Tmin |
-20℃ |
Minimum Operating Temperature |
|
Tmax |
100℃ |
Maximum Operating Temperature |
The advantages of needle roller bearings:
1.Small friction resistance
2.Low power consumption
3.High mechanical efficiency
4.Easy starting
5.The dimensions are standardized, interchangeable, easy to install and disassemble, and easy to maintain
6.Compact structure, light weight and smaller axial size.
7.High precision, high rotation speed, small wear and long service life.
8.Some bearings have self-aligning performance and are suitable for mass production.
9.They have stable and reliable quality and high production efficiency.
10.The transmission friction torque is much lower than that of hydrodynamic bearings, so the friction temperature rise and power consumption are lower
11.The starting friction torque is only slightly higher than the rotational friction torque
12.The sensitivity of bearing deformation to load changes is smaller than that of hydrodynamic bearings; only a small amount is needed
13.The lubricant can operate normally and can provide lubricant for a long time during operation; the axial size is smaller than that of traditional hydrodynamic bearings
Disadvantages of needle roller bearings:
They are noisy, the structure of the bearing seat is relatively complex, and the cost is high.
Even if the bearings are well lubricated, installed correctly, dust-proof and moisture-proof, and operate normally, they will eventually fail due to fatigue of the rolling contact surface.
The Production Process of Needle Roller:
