Introduction to the classification of rolling bearings

A. Classified by rolling bearing structure type
(1) Bearings are classified according to their load direction or nominal contact angle:
1) Radial bearings - mainly used 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 - mainly used for rolling bearings bearing axial loads, with a nominal contact angle greater than 45 to 90. According to the nominal contact angle, it is divided into: axial contact bearing----the thrust bearing with the nominal contact angle of 90: thrust angular contact bearing----the thrust bearing with the 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 body 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) Whether the bearing can be adjusted according to its work, is divided into:
1) Self-aligning bearing----The raceway is spherical, which can adapt to the angular deviation and angular movement between the two raceways.
2) Non-aligning bearings (rigid bearings)----bearings that can offset the axial angle between the raceways.
(4) The bearing is 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) Bearings can be separated according to their components, and are divided into:
1) separable bearings---bearings with separable parts;
2) Non-separable bearings----bearings that cannot be freely separated after the final assembly.
(6) Bearings can be divided into various structural 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 rib, or even the cage).
B. According to the size of the rolling bearing, the bearing is divided into: according to its outer diameter size:
(1) Miniature bearings----bearings with a nominal outside diameter range of 26 mm or less.
(2) Small bearings----bearings with a nominal outer diameter range of 28-55mm.
(3) Small and medium-sized bearings----bearings with a nominal outer diameter range of 60-115mm.
(4) Medium and large-sized bearings----bearings with a nominal outer diameter range of 120-190mm.
(5) Large bearings----bearings with a nominal outer diameter range of 200-430mm.
(6) Extra large bearings----bearings with a nominal outer diameter range of 440mm or more.