Cylindrical roller bearings

Cylindrical roller bearings are bearings in which cylindrical rollers make linear contact with the raceway. High load capacity, mainly bearing radial loads. The friction between the rolling element and the sleeve edge is small, suitable for high-speed rotation.
There are single row bearings such as NU, NJ, NUP, N, NF, as well as NNU and NN double row bearings, depending on whether the ring has a flange.
The bearing has a separable inner and outer ring structure.
Cylindrical roller bearings with inner or outer rings without retaining edges, whose inner and outer rings can move relative to each other in the axial direction, can be used as free end bearings.
A cylindrical roller bearing with double flanges on one side of the inner or outer ring and a single flange on the other side of the ring can withstand a certain degree of axial load in one direction.
Double row cylindrical roller bearings have high rigidity to radial loads and are mainly used for machine tool spindles.
Generally, steel plate stamping retainers or copper alloy car made retainers are used. But there are also some that use polyamide formed retaining frames.
According to the presence or absence of the retaining edge of the cylindrical roller bearing ring, it can be divided into the following shapes. The styles of cylindrical roller bearings NU, N, NNU, and NN are suitable for free side bearings. NJ and NF types can withstand a certain degree of axial load in one direction, while NH and NUP types are used as fixed side bearings.
NH type cylindrical roller bearings are assembled from NJ type cylindrical roller bearings and L-shaped retaining rings. When installing NUP type bearings, please turn the engraved side of the retaining ring outward.