1. Classified by rolling bearing (import bearing) construction type
(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:
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