(1) Imported bearings are classified according to their load direction or nominal contact angle:
1) Radial bearings - important for rolling bearings bearing radial loads, with nominal contact angles 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—Important rolling bearings for axial loads with nominal contact angles 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 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 is rolling one by one. The body is a spherical roller bearing.
(3) Whether the imported bearings are tempered according to their tasks are 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) The imported bearings are divided into: according to the number of rows of rolling elements:
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.
(5) Imported bearings are classified according to whether their components are separate:
1) Separate bearings----bearings with separate parts;
2) It is not possible to separate the bearings----the bearings can not be freely separated after the final assembly.
(6) The imported bearings can be divided into various construction types according to their structural shape (if there is no filling groove, whether there are inner and outer rings and the shape of the ferrule, the structure of the ribs, or even the presence or absence of a cage).
2. Classification according to the size of rolling bearings Bearings are divided into: according to their outer diameter size:
(1) Miniature bearings----bearings with a nominal outer diameter size of 26 mm or less;
(2) Small bearings----bearings with nominal outer diameter dimensions of 28-55mm;
(3) Small and medium-sized bearings----bearings with a nominal outer diameter of 60-115mm;
(4) Medium and large-sized bearings----bearings with a nominal outer diameter of 120-190mm
(5) Large bearings----bearings with a nominal outer diameter of 200-430mm;
(6) Extra large bearings----bearings with a nominal outer diameter size of 440mm or more.
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