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What are the classifications of bearings?


Deep groove ball bearings

The most representative rolling bearings are versatile and can withstand radial loads and bidirectional axial loads. Suitable for high-speed rotation and low-noise, low-vibration applications. Sealed bearings with steel dust caps or rubber seals are pre-filled with a proper amount of grease. Bearings with snap rings or flanges on the outer ring are easy to shaft. Positioning, and easy to install inside the casing. The maximum load type bearing is the same size as the standard bearing, but there is a loading groove in the inner and outer rings, which increases the number of balls and increases the rated load.

Self-aligning ball bearings

Spherical roller bearings are fitted with drum rollers between the inner ring with two raceways and the outer ring with spherical races. . The center of curvature of the raceway surface of the outer ring is identical to the center of the bearing, so it has the same self-aligning function as the self-aligning ball bearing. When the shaft and outer casing are deflected, the axial load in both directions can be automatically adjusted. The radial load capacity is large, and it is suitable for heavy load and impact load. The inner ring inner diameter is a tapered bore bearing that can be mounted directly. Or use the adapter sleeve and the removal cylinder to mount on the cylindrical shaft. The cage uses a steel stamping cage, a polyamide forming cage and a copper alloy cage.

Needle roller bearings

Solid needle roller bearings

The basic structure of inner ring bearings is the same as that of NU type cylindrical roller bearings, but due to the use of needle rollers The volume can be reduced, and can withstand large radial loads. Without inner ring bearings, the mounting surface of the shaft with appropriate accuracy and hardness should be used as the raceway surface.

Thrust Needle Roller Bearings

Separate Bearings

Consisting of raceway ring and needle roller and cage assembly, it can be combined with stamped thin raceway (W) or a combination of cut and processed thick raceway rings (WS). Non-separable bearings are integral bearings consisting of precision stamped raceway rings and needle and cage assemblies. Can withstand one-way axial load of this type of bearing. The small footprint is conducive to the compact design of the machine. Most of them only use the needle roller and cage assembly, and the mounting surface of the shaft and the casing is used as the raceway surface.

Tapered Roller Bearings

This type of bearing is equipped with a truncated roller and the roller is guided by a large rib on the inner ring. The apexes of the conical surfaces of the inner ring raceway surface, the outer ring raceway surface, and the roller rolling surface are designed to intersect at a point on the bearing center line. Single row bearings can withstand radial loads and one-way axial loads. Double row bearings can withstand radial loads and biaxial axial loads and are suitable for heavy and shock loads.

Cylindrical Roller Bearings

Cylindrical roller bearings can be classified into single-row, double-row and multi-row cylindrical roller bearings depending on the number of rows of rolling elements used in bearing assembly. Among them, a single row cylindrical roller bearing with a cage is used. In addition, there are cylindrical roller bearings of other constructions such as single or double row full complement rollers.

Single row cylindrical roller bearings

According to the ferrule ribs, it is divided into N type, NU type, NJ type, NF type and NUP type. Cylindrical roller bearings have a large radial load capacity and can withstand a certain one-way or two-way axial load depending on the structure of the ferrule rib. NN type and NNU double row cylindrical roller bearings are compact in structure, strong in rigidity, large in carrying capacity, and small in deformation after load, and are mostly used for the support of machine tool spindles. FC, FCD, FCDP four-row cylindrical roller bearings can withstand large radial loads and are mostly used in heavy machinery such as rolling mills.

Spherical Roller Bearings

The bearing is equipped with a spherical roller between the outer race of the spherical raceway and the inner race of the double raceway. According to the internal structure, it is divided into four types: R, RH, RHA and SR. Since the arc center of the outer ring raceway is consistent with the center of the bearing, it has self-aligning performance, so the shaft misalignment caused by the deflection or misalignment of the shaft or the outer casing can be automatically adjusted. Can withstand radial loads and bidirectional axial loads. In particular, it has a large radial load capacity and is suitable for withstanding heavy loads and shock loads. Tapered bore bearings can be attached to and removed from the shaft by using fasteners or withdrawal sleeves. Spherical roller bearings can withstand large radial loads while also withstanding certain axial loads. The outer ring raceway of this type of bearing is spherical, so it has the function of self-aligning. When the shaft is bent or tilted so that the center line of the inner ring and the center line of the outer ring are inclined no more than 1°~2.5°, the bearing can still work. .

Thrust Roller Bearings

Thrust Roller Bearings include thrust spherical roller bearings, thrust cylindrical roller bearings and thrust tapered roller bearings. A thrust spherical roller bearing can withstand both axial and radial loads, but the radial load must not exceed 55% of the axial load. Another important feature of this type of bearing is its self-aligning performance, which makes it less sensitive to different degrees of heart and shaft deflection. Just load P and P. No more than 0.05C, and the shaft rotates, the bearing allows a certain range of centering angle. The small number & #20540; is suitable for large bearings, and allows the centering angle to be reduced when the load is increased.

Spherical Bearings

Spherical bearings are preferred for applications where equipment and components are required, such as in agricultural machinery, transportation systems or construction machinery. It is mainly used to bear radial and axial combined loads mainly based on radial load. Generally, it is not suitable to bear axial load alone. Such bearings can be installed with inner ring (with full set of rollers and retainers) and outer ring. This type of bearing does not allow the shaft to be tilted relative to the housing, creating additional axial forces under radial load. The axial clearance of the bearing has a great relationship with the normal operation of the bearing. When the axial clearance is too small, the temperature rise is high; 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 can be installed to increase the rigidity of the bearing.

Joint Bearings

Joint bearings are lubricated and self-lubricating. Joint bearings are a special type of plain bearing. Its structure is simpler than rolling bearings. It is mainly composed of an outer ring with an inner spherical surface and can withstand large loads. It can withstand radial loads according to the inner ring with outer spherical surface and its different type and structure. , axial load or combined load of radial and axial simultaneously. Generally used for low-speed oscillating motion (ie, angular transport, or tilting motion within a certain range of angles (ie, aligning motion), because the sliding surface is spherical), the center of the bearing shaft and the shaft hole are not different. Larger bearings can still work normally.

Linear motion ball bearings are mainly used in linear reciprocating parts of mechanical equipment. They have 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.

Angular Contact Bearings

Angular contact ball bearings can withstand both radial and axial loads, as well as with pure axial loads. The ability of this type of bearing to withstand axial loads is determined by the contact angle, the contact angle is large, and the ability to withstand axial loads is high.

Pressure Bearings

Pressure bearings are separate bearings and are classified into one-way pressure balls and two-way pressure ball bearings according to their construction. One-way pressure bearings can withstand axial loads in one direction, and two-way pressure bearings can withstand axial loads in both directions. None of them can withstand radial loads