Structure and classification of KOYO imported bearings

Due to the different working conditions of various machines, KOYO bearings have various requirements in terms of load capacity, structure and performance. The KOYO imported bearings developed on the basis of plain bearings are based on rolling friction instead of sliding friction. Generally, two ferrules, a set of rolling elements and a cage are used for versatility, standardization and serialization. A very high degree of mechanical basics. To this end, KOYO bearings need to have a variety of structures. However, the most basic structure consists of the inner ring, the outer ring, the rolling elements and the cage.
The role of various parts in the bearing is:
For a radial bearing, the inner ring is usually tightly fitted to the shaft and operates with the shaft. The outer ring is usually in a transitional fit with the bearing housing or the mechanical housing bore to provide support. However, in some cases, there is also an outer ring running, the inner ring is fixed to support or the inner ring and the outer ring are simultaneously operated. For a thrust bearing, a shaft ring that fits tightly with the shaft and moves together, and a seat ring that is in a transitional fit with the bearing housing or the mechanical housing bore and serves as a support. The rolling elements (steel balls, rollers or needles) are normally arranged in the bearing between the two ferrules by means of a cage for rolling motion. The shape, size and number of the bearings directly affect the bearing capacity and performance of the bearing. In addition to the uniform separation of the rolling elements, the cage can also function to guide the rotation of the rolling elements and improve the lubrication performance inside the bearing.
  1. According to KOYO imported bearing structure type classification
(1) Bearings are classified according to their load direction or nominal contact angle:
        1) Radial bearing----Mainly used for bearing KOYO bearings with radial load, the nominal contact angle is from 0 to 45. According to the nominal contact angle, it is divided into: radial contact bearing----the radial bearing with the nominal contact angle of 0: the radial angular contact bearing---the radial bearing with the nominal contact angle greater than 0 to 45.
        2) Thrust bearings----Mainly used for bearing KOYO bearings with axial load, the nominal contact angle is greater than 45 to 90. According to the different nominal contact angles, they are further divided into: Axial contact bearings----Thrust bearings with a nominal contact angle of 90: Thrust angular contact bearings----Thrust bearings with a nominal contact angle greater than 45 but less than 90.
(2) Bearings are classified according to the type of rolling elements:
        1) Ball bearing ---- rolling element is the ball:
        2) Roller bearing----The rolling element is a roller. Roller bearings are divided into: Roller bearings----rolling elements are cylindrical roller bearings. The ratio of length to diameter of cylindrical rollers is less than or equal to 3; needle roller bearings---- The rolling element is a needle roller bearing, the ratio of the length to the diameter of the needle roller is greater than 3, but the diameter is less than or equal to 5 mm; the tapered roller bearing----the rolling element is the bearing of the tapered roller; the spherical roller bearing one by one The rolling elements are bearings of spherical rollers.
       (3) Bearings can be adjusted according to their work, divided into:
        1) Self-aligning bearing----the raceway is a spherical shape, which can adapt to the angular deviation and angular movement between the two raceway axes;
        2) Non-aligning bearings (rigid bearings)----bearings that can offset the axial angle between the raceways.
       (4) Bearings are divided into:
        1) Single row bearings - bearings with a row of rolling elements;
        2) Double row bearings---bearings with two rows of rolling elements;
        3) Multi-row bearings----bearings with more than two rows of rolling elements, such as three-row and four-row bearings.

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How to choose the type and type of imported bearings

When selecting SKF bearings, it is necessary to select whether the bearings meet our mechanical use range according to the size, specifications, and speed of the bearings. The following is a simple analysis:
The first is the size limit.
Usually the space in which SKF bearings can be installed is limited. In most cases, the shaft diameter (or bearing inner diameter) is limited by mechanical design or other design. Therefore, the choice of bearing type and size is determined by the inner diameter of the SKF bearing. As a result, the main dimensions of standard SKF bearings are based on the international standard internal diameter dimensions.
Standard SKF bearings are available in a wide range of sizes. It is best to use standard SKF bearings when designing mechanical devices. (This design is easy to purchase from SKF bearings. Here is a question. Some models on the bearing catalogue do have some, but some The SKF bearing is not in stock in mainland China, and sometimes the futures will be for a long time, so the time cost and the cost of later replacement should be taken into account when selecting the bearing. The load of the SKF bearing, the load applied to the bearing, its nature and size. The direction is changeable. Usually, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting a suitable SKF bearing. When the size of the ball and needle bearing is equivalent, the needle bearing usually has a high load capacity and withstands large vibration and shock loads.
Followed by the speed.
The allowable speed is determined by factors such as the type, size, accuracy, cage type, load, lubrication method, and cooling method of the SKF bearing. The permissible speeds of standard-precision SKF bearings under oil lubrication and grease lubrication are listed on the SKF bearing table. Generally, deep groove ball bearings, self-aligning ball bearings, and cylindrical roller bearings are suitable for high-speed operation.
Again, SKF bearing tolerances.
SKF bearing dimensional accuracy and rotation accuracy are based on ISO and JIS standards. For machines requiring high precision and high speed operation, bearings with 5 or more precision are recommended. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machines with high running accuracy. Rigidity, when the rolling element and the raceway contact surface of the SKF bearing are pressed, elastic deformation occurs. Some machines need to minimize elastic deformation. The roller SKF bearing has a smaller elastic deformation than the ball bearing.
In addition, in some cases SKF bearings are subject to preload to increase rigidity. This program is usually used for deep groove ball bearings, radial thrust ball bearings and tapered roller bearings. The shaft is bent, the shaft or bearing housing tolerance changes, and the misalignment will lead to the eccentricity of the inner and outer rings. In order to prevent the eccentric angle from being too large, automatic self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are preferred choices. Audio frequency and torque, rolling bearings are manufactured according to high-precision standards, so the sound and torque are small. Deep groove ball bearings and cylindrical roller bearings are suitable for applications where low noise and low torque are required.
Installation and disassembly, some applications require frequent disassembly and installation to ensure regular inspection and repair. SKF bearings such as cylindrical bearings, needle bearings, and tapered bearings that can be installed separately for the inner and outer rings are very suitable for this application. The tapered self-aligning ball bearing and self-aligning roller bearing also simplify the installation procedure with the help of the bushing.

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