Self-aligning roller bearing is a bearing with drum rollers installed between the inner ring with two raceways and the outer ring with spherical raceway.
brief introduction
Self-aligning roller bearing has two rows of rollers, which mainly bear radial load and axial load in any direction. It has high radial bearing capacity and is especially suitable for working under heavy load or vibration load, but it cannot bear pure axial load. The outer raceway of this bearing is spherical, which has good self-aligning performance and can compensate the coaxiality error.
type
Self-aligning roller bearings Self-aligning roller bearings are divided into cylindrical inner holes and conical inner holes.
Self-aligning roller bearing with code K (153000 or13000) and self-aligning roller bearing with code K (1 13000). When the bearing is matched with the tapered shaft, the radial clearance of the bearing can be adjusted by moving the inner ring along the axial direction.
Self-aligning roller bearing post code: Install tapered hole self-aligning roller bearing with post code K and K30 on the matching fastening sleeve, and the bearing with post code K+H and K30+H will be formed. This kind of bearing can be installed on the optical axis without shoulders, which is suitable for occasions where bearings need to be frequently assembled and disassembled. In order to improve the lubrication performance of the bearing, an annular oil groove is opened on the outer ring of the bearing and three evenly distributed oil holes are drilled, and its rear code is W33.
Different types of self-aligning roller bearings: for example, NTN LH series self-aligning roller bearings.
The application of self-aligning bearings is increasing gradually, especially long-life bearings in high temperature environment. According to different application environments, NTN engineers have developed STJ2 steel, which can prolong the service life in a wide temperature range, from room temperature to 250℃. This steel is the standard material of LH series self-aligning roller bearings. The features of this bearing are as follows (compared with SUJ2): long-life bearing in a large temperature range, 3.5 times that of ordinary materials at room temperature, 30 times that of ordinary materials at high temperature (250℃), surface damage prevention, 7 times peeling resistance, 65,438+0.4 times scratch resistance, 2.5 times wear resistance and dimensional stability at 250℃. The fracture fatigue strength is increased by 2 times, which simplifies the storage management procedure of parts. A single standard bearing model can be used from room temperature to 250℃, and the self-aligning roller bearing will gradually change into "LH series".
model
Specific classification and model comparison: 1, self-aligning roller bearing (20000 CC) 2, self-aligning roller bearing with tapered hole (20000 CCK) 3, self-aligning roller bearing with tapered hole (20000 CC/W33) 4, self-aligning roller bearing with tapered hole (20000 CCK/W33) 5. Feature editing of hole self-aligning roller bearing (model 20000 CCK/W33+H0000) installed on fastening sleeve. This self-aligning roller bearing is a bearing with double rows of raceway in the inner ring, spherical raceway in the outer ring and drum-shaped roller. The center of the raceway surface of the outer ring is consistent with the center of the bearing, which has self-aligning performance, and can be used normally even if the inner and outer rings are inclined due to the installation error or shaft deviation between the shaft and the bearing box. This kind of bearing has large radial bearing capacity and can also bear heavy load and impact load. And because of its self-positioning performance, it can bear axial loads in two directions to some extent. Therefore, this kind of bearing can be applied to large mechanical equipment, such as papermaking machinery, vibrating screen and general industrial machinery, where the shaft may be bent or the assembly error is inevitable. The cage of self-aligning roller bearing is formed by stamping smaller steel plate, and the larger one is cut from brass or low carbon steel.
use
Mainly applicable to cages: steel plate stamping cage (Z-shaped), copper alloy cutting cage, pin cage and synthetic resin molding cage. Main applications: medium and large motors, generators, internal combustion engines, gas turbines, machine tool spindles, reducers, loading and unloading machinery and various industrial machinery.
fixed
Self-aligning roller bearing is equipped with a drum roller bearing between the inner ring with two raceways and the outer ring with spherical raceway. The curvature center of the raceway surface of the outer ring is consistent with the bearing center, so it has the same self-aligning function as the self-aligning ball bearing. When the important official and the shell are bent, it can automatically adjust the load in two directions and the axial load. Large radial load capacity, suitable for heavy load and impact load. Bearings with tapered holes in the inner ring can be installed directly. Or mounted on a cylindrical shaft using a fastening sleeve and a dismounting cylinder. The cage adopts steel plate stamping cage, polyamide forming cage and copper alloy turning cage. For the self-aligning bearing, when the bearing with shaft is installed in the shaft hole of the box, the use of the middle mounting ring can prevent the outer ring from tilting and rotating. It should be remembered that the balls of some self-aligning ball bearings protrude from the side of the bearing, so the middle mounting ring should be recessed to prevent the balls from being damaged. A large number of bearings are generally installed by mechanical or hydraulic press-in. For separable bearings, the inner ring and the outer ring can be installed separately, which simplifies the installation process, especially when both the inner ring and the outer ring need interference fit. When installing a shaft with an inner ring into a bearing box with an outer ring, it is necessary to check whether the inner and outer rings are properly aligned to avoid scratching the bearing raceway and rolling parts. If cylindrical and needle roller bearings use inner rings without flanges or inner rings with flanges on one side, it is recommended to use mounting sleeves. The outer diameter of the sleeve should be equal to the inner ring raceway diameter f, and the machining tolerance standard is d 10. It is best to install needle bearing with mandrel stamped outer ring.
principle
The contact surface between the bearing outer ring and the roller is spherical, and the shape of the roller is also machined into a spherical surface matching with the outer ring. After installation, it will allow the inner ring and the outer ring to swing to achieve the purpose of self-alignment. For these reasons, the quality of self-aligning roller bearings is different from the price reflected by material technology, region and manufacturer, but the bearing value reflected by the price is also different.
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