Self aligning ball bearing
The self-aligning roller bearing is equipped with drum roller between the inner ring with two raceways and the outer ring with spherical raceway. The curvature center of outer ring raceway surface is consistent with the bearing center, so it has the same self-aligning function as the self-aligning ball bearing. Wechat of metal processing has good content and deserves attention. When the shaft and shell are flexed, the load can be adjusted automatically and the axial load in two directions can be realized. Radial load capacity, suitable for heavy load, impact load. The inner diameter of inner ring is tapered hole bearing, which can be directly installed. Or install it on the cylindrical shaft with a set sleeve and a disassembly cylinder. The cages are made of steel sheet, polyamide and copper alloy.
Needle roller bearing
Solid needle roller bearing
The basic structure of bearing with inner ring is the same as that of Nu type cylindrical roller bearing. However, due to the use of needle roller, its volume can be reduced and it can bear large radial load. The mounting surface of shaft with appropriate accuracy and hardness should be used as raceway surface for bearings without inner ring.
Thrust needle roller bearing
The separated type bearing is composed of raceway ring, needle roller and cage assembly. It can be combined with thin raceway ring (W) processed by stamping or thick raceway ring (WS) machined by cutting. Non separable bearing is an integral bearing composed of raceway ring, needle roller and cage assembly. This kind of bearing can bear unidirectional axial load. The space occupied is small, which is conducive to the compact design of machinery. Most of them only use needle roller and cage components, and use the mounting surface of shaft and shell as raceway surface.
This kind of bearing is equipped with cone-shaped roller, which is guided by the large rib of inner ring. In design, the top points of the inner ring raceway surface, outer ring raceway surface and tapered surface of roller rolling surface intersect at a point on the bearing center line. Single row bearing can bear radial load and unidirectional axial load, double row bearing can bear radial load and bidirectional axial load, which is suitable for bearing heavy load and impact load.
According to the different number of columns of rolling elements, cylindrical roller bearings can be divided into single row, double row and multi row cylindrical roller bearings. The single row cylindrical roller bearing with cage is widely used. In addition, there are single row or double row full loaded roller and other structures of cylindrical roller bearings.
The single row cylindrical roller bearing can be divided into N type, nu type, NJ type, NF type and NUP type according to the different ring rib. Cylindrical roller bearing can bear large radial load, and can also bear certain unidirectional or bidirectional axial load according to the structure of ring flange. NN type and NNU type double row cylindrical roller bearings are compact in structure, strong in rigidity, large in bearing capacity and small in deformation after being loaded. They are mostly used to support machine tool spindles. FC, FCD and fcdp type four row cylindrical roller bearings can bear large radial load, and are mostly used in heavy machinery such as rolling mills.
Self aligning roller bearing
This kind of bearing is equipped with spherical roller between the outer ring of spherical raceway and the inner ring of double raceway. According to the internal structure, it can be divided into four types: R, Rh, RHA and Sr. Because the arc center of the outer ring raceway is consistent with the bearing center, it can automatically adjust the center misalignment caused by the deflection or non concentricity of the shaft or shell. It can bear radial load and bidirectional axial load. Especially the radial load capacity is large, which is suitable for bearing heavy load and impact load. Wechat of metal processing has good content and deserves attention. The tapered bore bearing can be assembled and disassembled on the shaft by using fasteners or stripping sleeve. The self-aligning roller bearing can bear large radial load and certain axial load at the same time. The raceway of the outer ring of this kind of bearing is spherical, so it has the function of centering. When the shaft is bent or tilted, the relative inclination between the center line of the inner ring and the center line of the outer ring is no more than 1 ° to 2.5 °.
Thrust roller bearing
Thrust roller bearings include thrust self-aligning roller bearings, thrust cylindrical roller bearings and thrust tapered roller bearings. The thrust self-aligning roller bearing can bear both axial and radial loads, but the radial load should not exceed 55% of the axial load. Another important feature of this kind of bearing is its self-aligning performance, which makes it insensitive to different centrality and shaft deflection. As long as the load P and P. Under 0.05c and the rotation of the shaft ring, the bearing is allowed a certain range of centering angle. Small values are suitable for large bearings, and the allowable centering angle will decrease when the load increases.
Outer spherical bearing
Spherical bearings are preferred for applications requiring simple equipment and parts, such as agricultural machinery, transportation systems or construction machinery.
It is mainly used to bear the combined radial and axial load, which is mainly radial load. Generally, it is not suitable to bear the axial load alone. This kind of bearing can be installed with inner ring (with full set of rollers and retainer) and outer ring respectively. This kind of bearing does not allow the shaft to tilt relative to the shell, which will produce additional axial force under radial load. The axial clearance of this kind of bearing has a great influence on whether the bearing can work normally. When the axial clearance is too small, the temperature rise is high; when the axial clearance is large, the bearing is easy to be damaged. Therefore, special attention should be paid to adjusting the axial clearance of the bearing during installation and operation. If necessary, pre interference installation can be used to increase the rigidity of the bearing.
There are two types of plain bearings: lubricated and self-lubricating. Plain bearing is a kind of sliding bearing with special structure. Its structure is simpler than that of rolling bearing. It is mainly composed of one outer ring with inner spherical surface, which can bear larger load. According to the inner ring with outer spherical surface and its different types and structures, it can bear radial load, axial load or combined load with radial and axial simultaneously. It is generally used for swing motion with low speed (i.e. angular movement, or inclined movement within a certain angle range (i.e. centering movement). Since the sliding surface is spherical, it can still work normally when the supporting shaft and the shaft shell hole are not concentric.
Linear motion ball bearing is mainly used in the parts of mechanical equipment with linear reciprocating motion. It has the advantages of small friction, flexible movement and convenient maintenance and replacement. It is widely used in textile machinery, printing machinery, medical machinery, precision machine tools, electrical cutting machines and automatic recorders and other fields.
Angular contact ball bearing can bear both radial load and axial load at the same time. It can also increase the limit speed with pure axial load. The axial load bearing capacity of this kind of bearing is determined by the contact angle. The contact angle is large and the bearing capacity is high.