Advantages of needle roller bearing: small friction resistance, small power consumption, high mechanical efficiency, easy to start. Standard size, interchangeability, easy to install and disassemble, easy to maintain. Compact structure, light weight, more axial size reduction. High precision, high speed, small wear, long service life. Some bearings have automatic aligning performance, suitable for mass production, stable quality and high production efficiency. The friction torque of transmission is much lower than that of fluid dynamic pressure bearing, so the friction temperature rise and power consumption are lower. The starting friction torque is only slightly higher than the rotational friction torque. The sensitivity of bearing deformation to load variation is less than that of hydrodynamic bearing. It only needs a small amount of lubricant to run normally, and can provide lubricant for a long time when running; The axial dimension is smaller than the traditional fluid dynamic pressure bearing; It can bear combined radial and thrust loads simultaneously; In a wide range of load-speed, the unique design can obtain excellent performance; Bearing performance is relatively insensitive to fluctuations in load, speed and running speed.

 

The disadvantages of needle roller bearings: loud noise, the structure of the bearing seat is more complex, the cost is higher, even if the bearing is well lubricated, installed correctly, dust-proof and moisture-proof, and operates normally, they will eventually fail because of the fatigue of the rolling contact surface.