outer spherical bearing

outer spherical bearings:
A Variant of Deep Groove Ball Bearing
The outer spherical ball bearing is actually a variant of the deep groove ball bearing, which is characterized by its outer diameter surface being spherical, which can be matched into the corresponding concave spherical surface of the bearing seat to play the role of self-aligning. Outer spherical bearings are mainly used to bear radial load-based radial and axial combined load, generally should not bear the axial load alone.
Chinese name outer spherical bearing outer name insert bearing features: its outer ring outer diameter surface is spherical load with radial as the main discipline mechanical engineering application example fan, light load transmission device outer spherical bearing
Bearing small knowledge: outer spherical bearing
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The difference between spherical bearings and deep groove ball bearings
Brief introduction: although its basic performance should be similar to that of deep groove ball bearings, due to the fact that these bearings are mostly used in relatively rough machinery, the installation and positioning are not accurate enough, the axis of the shaft and the seat hole is poor to neutral, or the shaft is long and the deflection is large, etc., and the bearing itself is not accurate enough, and some structures are relatively rough, therefore, the actual performance of the performance of the same specifications of deep groove ball bearings to play a considerable discount. For example, the outer spherical ball bearing with top wire is applied to the shaft with large stiffness difference and large deflection. This kind of bearing has sealing rings on both sides, which can strictly prevent dirt from intruding and has been filled when leaving the factory.
Appropriate amount of lubricant, no need to clean before installation, no need to add lubricant, when the top wire screw on the protruding end of the bearing inner ring is tightened on the shaft. The allowable axial load shall not exceed 20% of the rated dynamic load.
outer spherical bearing
The performance of the outer spherical ball bearing with eccentric sleeve is basically the same as that of the outer spherical bearing with top wire, except that the top wire is not on the inner ring, but on the eccentric sleeve. The inner hole of the spherical ball bearing with tapered hole is a tapered hole with 1:12, which can be directly installed on the tapered shaft, or installed on the optical axis without shaft shoulder by means of a fixed bushing, and the bearing clearance can be fine-tuned.
Spherical bearings are preferred for applications that require simple equipment and components, such as agricultural machinery, transportation systems or construction machinery.
Mainly used to bear radial load-based radial and axial combined load, generally should not bear the axial load alone, such bearings can be installed respectively inner ring (with full set of rollers and retainer) and outer ring. This type of bearing does not allow the shaft to tilt relative to the housing, which will generate additional axial forces under radial load. The size of the axial clearance of the bearing has a great relationship with whether the bearing can work normally. When the axial clearance is too small, the temperature rise is higher; when the axial clearance is large, the bearing is easily 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.
Type: Spherical ball bearing with seat
The outer spherical bearing with seat is a bearing unit that combines the rolling bearing with the bearing seat. Most of the outer spherical bearings are made into a spherical outer diameter, and with a spherical bore housing installed together, the structure of various forms, versatility and interchangeability.
At the same time, this type of bearing also has a certain degree of self-alignment in the design, easy to install, with a double structure of the sealing device, can work in harsh environments. The bearing seat is generally formed by casting. Common seats include vertical seat (P), square seat (F), boss square seat (FS), boss round seat (FC), diamond seat (FL), ring seat (C), slide seat, etc. (T).
Spherical bearing with seat is divided into bearing core and bearing seat, which is called bearing core and bearing seat. For example, spherical bearing with set screw UC205 and vertical seat are called UCP205. Because of the strong interchangeability of the outer spherical bearing with seat, the bearing heart can be assembled in the same specification and different shapes of the bearing seat.
Other
Spherical ball bearing with vertical seat
Spherical bearing with square seat
Spherical ball bearing with rhombic seat
Spherical ball bearing with boss round seat
Spherical ball bearing with annular seat
Spherical ball bearing with slider seat
Spherical ball bearing with suspended seat
Spherical ball bearing with suspension seat
Spherical ball bearing with adjustable diamond seat
Spherical ball bearing with stamping seat
Spherical ball bearings with other seats
Disassembly and assembly: 390000 series outer spherical bearings are fixed to the inner ring of the bearing and the shaft through the eccentric sleeve, and the hexagon socket screws on the eccentric sleeve play a fastening role. In the maintenance, many of the machine will not disassemble this bearing, it is necessary to introduce the disassembly of the 390000 series of spherical bearings outside the technical points and matters needing attention:
Removal
1. Loosen the locking screw on the eccentric sleeve of the bearing with an Allen wrench, then insert a small iron rod into the counterbore on the eccentric sleeve of the top cover, and loosen the eccentric sleeve against the rotation direction of the shaft.
2. Loosen the bolts fixing the bearing seat. Remove the bearing from the shaft together with the bearing housing. Pay attention before removing the bearing seat at one end of the shaft. The bearing seat bolts at the other end of the shaft should be loosened to avoid damage to the bearings at both ends.
Installation
1. Before installing the bearing on the shaft, the fixing pin of the bearing jacket must be pulled out first, and the surface of the journal must be polished to be smooth and clean, and the journal must be oiled for rust prevention and lubrication (the bearing is allowed to rotate slightly on the shaft).
2. Apply lubricating oil to the mating surface of the bearing seat and the bearing, and install the bearing into the bearing seat. Then the assembled bearing and bearing housing together with the sleeve on the shaft. Push to the required position for installation.
3. Do not tighten the bolts that fix the bearing seat first, and let the bearing jacket rotate in the bearing seat. Similarly, install the bearing and seat at the other end of the same shaft, and rotate the shaft several times to let the bearing itself automatically find the correct position. Tighten the bearing seat bolts.
4. Install eccentric sleeve. First, the eccentric sleeve is set on the eccentric step of the inner sleeve of the bearing and tightened by hand along the rotation direction of the shaft. Then insert a small iron rod into or against the counterbore on the eccentric sleeve. Tap the small iron bar with the hammer in the direction of rotation along the axis. Install the eccentric sleeve firmly, and finally lock the hexagon socket screws on the eccentric sleeve.
Classification: The outer spherical ball bearings can be divided into three categories according to the cooperation method with the shaft:
The codes of 1. spherical ball bearings with top wire are UC200 series (light series), UC300 series (heavy series) and UB(SB)200 series of deformed products. If the application environment is small, UC200 series is usually selected, otherwise UC300 series is selected. Usually, there are two top wires on the outer spherical ball bearing, with an included angle of 120 °. Its characteristic is that when cooperating with the shaft, the top wire is used to top the shaft, and then it has a fixed effect. However, the environment for its cooperation requires a small oscillation scale. This kind of outer spherical ball bearing is widely used in textile machinery, ceramic machinery and other production occupations.
2. with taper outer spherical ball bearings its code: UK200 series, UK300 series. This kind of outer spherical ball bearing inner diameter is 1:12 share of the taper inner hole, the use of cooperation with the adapter sleeve application, the characteristics of this kind of outer spherical ball bearing is: can accept larger load than the outer spherical ball bearing with top wire. Since the inner diameter of the adapter sleeve with which it cooperates is smaller than that of the spherical ball bearing with top wire, for example, the inner diameter of the spherical ball bearing UC209 with top wire is 45mm, and the diameter of the shaft with which it cooperates is 45mm, if it is replaced by the spherical ball bearing with taper, only the adapter sleeve with inner diameter of 45mm can be selected, however, the only spherical ball bearing with taper that cooperates with the 45mm set sleeve is UK210 (of course, UK310 can be selected if the fit is higher). As a result, the fit accepted by UK210 is much larger than that of UC209.
3. with eccentric sleeve outer spherical ball bearings its code: UEL200 series, UEL300 series, SA200 series. The primary feature of this kind of spherical ball bearing is that one end of the bearing has a certain degree of partial pain, and a partial pain sleeve with the same degree of partial pain cooperates with it. This kind of bearing can also be said to be a special bearing, because it is mainly used in agricultural machinery (harvester, straw returning machine, thresher, etc.), this kind of outer spherical ball bearing is mainly used in the layout with relatively strong beating, and the cooperation of partial pain layout can effectively reduce the strong beating.