Cylindrical roller and raceway are linear contact bearings with large load capacity, which mainly bear radial load. The friction between the rolling element and the retaining edge of the ferrule is small, which is suitable for high-speed rotation. According to the bearing exhibition, there are single row cylindrical roller bearings such as Nu, NJ, NUP, N and NF and double row cylindrical roller bearings such as NNU and NN according to whether the ferrule has a retaining edge or not. The bearing is a separable structure of inner ring and outer ring.
Cylindrical roller bearing with no flange on the inner ring or outer ring, whose inner ring and outer ring can move relative to each other in the axial direction, can be used as a free end bearing. A cylindrical roller bearing with double retaining edges on one side of the inner ring and the outer ring and a single retaining edge on the other side can bear a certain degree of axial load in one direction. Generally, steel plate stamping cage or copper alloy turning solid cage are used. However, some use polyamide formed cages.
The roller of cylindrical roller bearing is in line contact with the raceway, and the radial load capacity is large. It is not only suitable for bearing heavy load and impact load, but also suitable for high-speed rotation. At the same time, it improves the lubrication conditions in the contact area between the roller end face and the retaining edge, and improves the service performance of the bearing. Wechat is very noteworthy! It is generally applicable to large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, reduction boxes, rolling mills, vibrating screens and hoisting and transportation machinery.
Bearing characteristics
1. The roller and raceway are in line contact or repair line contact, with large radial bearing capacity, which is suitable for bearing heavy load and impact load.
2. Low friction coefficient, suitable for high speed, and the limit speed is close to the deep groove ball bearing.
3. N type and nu type can move axially, can adapt to the change of relative position between shaft and shell caused by thermal expansion or installation error, and can be used as free end support.
4. The processing requirements for the shaft or seat hole are high. After the bearing is installed, the relative deflection of the outer ring axis shall be strictly controlled to avoid contact stress concentration.
5. The inner ring or outer ring can be separated to facilitate installation and disassembly.
Product features
The cylindrical roller is in line contact with the raceway and has large radial load capacity. It is not only suitable for bearing heavy load and impact load, but also suitable for high-speed rotation.
The raceway and rolling element of cylindrical roller bearing are in geometric shape. After the improved design, it has high bearing capacity. The new structural design of retaining edge and roller end face not only improves the axial bearing capacity of the bearing, but also improves the lubrication conditions in the contact area between roller end face and retaining edge, and improves the service performance of the bearing.
Accuracy class
Cylindrical roller bearings can be divided into Po, P6, P5, P4 and P2 according to the accuracy grade The accuracy level is sorted from low to high.
Structural form
1. N0000 cylindrical roller bearings without flange on the outer ring and nu0000 cylindrical roller bearings without flange on the inner ring can accept large radial load, high limit speed, do not restrict the axial displacement of the shaft or shell, and cannot accept axial load.
2. Cylindrical roller bearings nj0000 and nf0000 with retaining edges on the inner and outer rings can bind the axial displacement of the shaft or shell in one direction and accept small unidirectional axial load. Nu0000 + hj0000, nj0000 + hj0000 and nup0000 bearings can bind the axial displacement of the shaft or housing in both directions within the axial clearance of the imported bearing. And can accept small bidirectional axial load.
Bearing material
The materials used to manufacture bearing components have a great impact on the performance and reliability of rolling bearings. General considerations for bearing rings and rolling elements include: hardness related to bearing capacity, fatigue resistance under rolling contact and lubrication conditions with different cleanliness, and dimensional stability. For the cage, friction, strain and inertial force should be considered, and in some cases, chemical interaction with some lubricants, solvents, coolants and refrigerants should also be considered. The relative importance of these considerations is also affected by other working parameters, such as corrosion, high temperature, impact load or the combination of these factors.
The bearing exhibition believes that the contact seal ring embedded in the rolling bearing also has a significant impact on the performance and reliability of the bearing. The materials used in its manufacture must have excellent oxidation resistance, heat resistance or chemical corrosion resistance.
