Structural classification of cylindrical roller bearings
1., the outer ring without edge, N0000 type and inner ring without edge NU0000 type, cylindrical roller bearing, this kind of bearing can accept larger radial load, high limit speed, no axis or enclosure axial displacement, can't accept axial load. 2. cylindrical roller bearings with both sides inside and outside of the outer ring. Type NJ0000 and NF0000 bearings can be used to hold the axial displacement of the shaft or shell in one direction and accept smaller axial loads. NU0000+HJ0000, NJ0000+HJ0000 and NUP0000 bearings can be used in the axial gap of the imported bearings, the axial displacement of the two axes of the shaft or enclosure, and can accept a smaller two-way axial load. Cylindrical roller bearings belong to separate bearings, and installation and disassembly are very convenient. Cylindrical roller bearings can bear larger radial load and are suitable for use in high speed operation. Such bearings allow the inner ring axis and the outer ring axis angle error (tilt) is very small, only 2 'to 4'. Therefore, the machining accuracy of shafts and bearing housings is relatively high, otherwise, uneven load or stress concentration is easy to occur at raceway contact parts. But the modification of the roller or raceway contact bus can reduce the stress concentration.
Cylindrical roller bearings can be divided into single column, double row and multi row cylindrical roller bearings according to the number of columns used for rolling. The bearings of different structures are also shown in the design of the retaining positions. The cylindrical roller bearings used in the following forms: single row cylindrical roller bearings: single row cylindrical roller bearing is separable bearing, convenient installation and disassembly, two rings can adopt the tight fit, the contact line between the fixed roller and raceway can reduce the stress concentration. Double row cylindrical roller bearings: double row cylindrical roller bearings are moving bearings, separable, so that installation and disassembly is very convenient. Tight fit can be used for the two rings. Double row cylindrical roller bearings almost do not allow an inclination angle. Single row bearings, N and NU type N bearings, the outer ring without edge, the inner ring on both sides of the edge. The displacement of the shaft relative to the bearing seat in the two directions of the axial direction can be allowed. NU type bearing, both sides of the outer ring block, inner ring without edge. The displacement of the shaft relative to the bearing seat in the two directions can also be allowed.
