Zhejiang Waxing Electromechanical Co., Ltd is one of the most professional manufacturers and suppliers of needle roller bearing nq404820 in China. Welcome to buy high quality customized bearings made in China here from our factory. For price consultation, contact us.
Products Description
No.: NQ404820
Size：40x48x20 mm
Weight：0.068kg
Basic dynamic load rating (C) - 20.9 kN
Basic static load rating (C0) - 39.8 kN
(Grease) Lubrication Speed - 11000 r/min
(Oil) Lubrication Speed - 12000 r/min
Lead time:5-7 business day
Type:Needle roller bearing
Detailed parameters and installation dimensions:
Fw: 40 mm
D: 48 mm
C: 20 mm
r min.: 0.3 mm
r5 min.: 0.3 mm
Mass: 0.064 Kg
Cr: 20.9 kN
Cor: 39.8 kN
Grease rpm: 11000 r/min
Oil rpm: 12000 r/min
Needle roller bearing , the raceways have optimized roughness and geometrical accuracy. This gives a higher load-carrying capacity and longer service life.
The advantages of needle roller bearings: small frictional resistance, low power consumption, high mechanical efficiency, easy to start. The size is standardized, interchangeable, easy to install and disassemble, and easy to maintain. The structure is compact, the weight is light, and the axial dimension is further reduced. High precision, high speed, small wear and long service life. Some bearings have self-aligning performance, suitable for mass production, stable and reliable quality, and high production efficiency. Transmission friction torque is much lower than that of hydrodynamic bearings, so friction temperature rise and power consumption are lower; starting friction torque is only slightly higher than rotational friction torque; bearing deformation is less sensitive to load changes than hydrodynamic bearings; only a small amount is required The lubricant can run normally, and can provide lubricant for a long time during operation; the axial dimension is smaller than that of traditional hydrodynamic bearings; it can bear combined radial and thrust loads at the same time; in a large load-speed range, the unique design Excellent performance can be obtained; bearing performance is relatively insensitive to fluctuations in load, speed and operating speed.
Disadvantages of needle roller bearings: high noise, complex structure of the bearing seat, high cost, even if the bearings are well lubricated, installed correctly, dust-proof and moisture-proof, and operate normally, they will fail due to the fatigue of the rolling contact surface.
In order to avoid local deformation or embrittlement of the stamped outer ring and prevent the normal operation of the needle roller from being damaged, it is forbidden to use tools such as hand hammers to hit the thin-walled outer ring when installing the bearing, and a press or special installation tools should be used for installation. The drawn cup needle roller bearing is pressed into the housing hole by means of the assembly mandrel. The shoulder of the assembly mandrel should be in contact with the side marked with the code number of the bearing. An annular sealing ring is installed in the annular groove of the assembly mandrel to make the bearing attach stably. It simplifies the assembly of bearings on the production line, if possible by using a press on the production line. Bearings must not be tilted during installation. A sufficient amount of grease should be injected into the drawn cup needle roller bearing before assembly, because it cannot be lubricated after assembly.
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