The advantages of needle roller bearings: small friction resistance, small power consumption, high mechanical efficiency, easy to start. Size standardization, interchangeability, easy installation and disassembly, easy maintenance. Compact structure, light weight, axial size is even smaller. High precision, high speed, small wear, long service life. Part of bearings have automatic self-aligning performance, suitable for mass production, stable quality and reliable, high production efficiency. The friction torque of transmission is much lower than that of hydrodynamic bearing, so the friction temperature rise and power consumption are lower. The starting friction moment is only slightly higher than the rotational friction moment. The sensitivity of bearing deformation to load change is less than that of hydrodynamic bearing. Only a small amount of lubricant is required for normal operation, and lubricant can be provided for a long time during operation. The axial size is smaller than that of traditional hydrodynamic bearings. It can bear radial and thrust combined load at the same time. The unique design allows for excellent performance over a wide load-speed range; Bearing performance is relatively insensitive to fluctuations in load, speed and running speed.

 

 

 

Disadvantages of needle roller bearings: loud noise, the structure of the bearing seat is more complex, the cost is high, even if the bearing is well lubricated, installed correctly, dustproof and moisture-proof tight, normal operation, they will fail because of fatigue of the rolling contact surface.