Cylindrical roller bearings
The internal structure of cylindrical roller bearings is roller arranged in parallel, roller spaced by cage or isolation block, this can prevent roller tilt or avoid the friction between rollers, preventing the increase in rotational torque.
Cylindrical roller contact with raceway in line, carrying large loads, mainly bear radial loads. The friction between roller and blocking washer is small, suitable for high-speed rotation. According to whether the rings with ribs, the cylindrical roller bearings divided into NU, NJ, NUP, N, NF single-row cylindrical roller bearings and NNU, NN double-row cylindrical roller bearings, These bearings are separable structure in inner ring and outer ring.
Cylindrical roller bearing’s characteristic.
1. The contact between roller and raceway is line contact or repair offline contact, carrying large radial load, suitable for heavy loads and impact loads.
2. Friction coefficient is small, suitable for high-speed rotation, limit speeding close to the deep groove ball bearings.
3. N-type and NU-type bearings can be axial moved, can adapt the relative position changed between the shaft and shell which caused by thermal expansion or installation error, can be used in free-end support.
4. Cylindrical roller bearings require higher precision in shaft and housing hole machining, the relative deviation of the outer ring axis after installation should be controlled strictly, avoid the contact stress concentration.
5. Inner and outer ring can be separated, easy to install and remove.