1. Rolling (imported bearing) structure type classification

(1) the imported bearings can bear the load direction according to their nominal contact angle is different, and is divided into:
1) radial bearings ---- important to bear radial load Rolling nominal contact angle from 0 to 45. Nominal contact angle is divided into: radial contact bearings ---- nominal contact angle of 0 radial bearings: Angular contact bearings ---- nominal contact angle greater than 0-45 radial bearings.
2) thrust bearings ---- important for axial load Rolling nominal contact angle greater than 45-90. Nominal contact angle is divided into: the axial contact bearings ---- nominal contact angle 90 thrust bearings: thrust angular contact bearings ---- nominal contact angle greater than 45 but less than 90 of the thrust bearing.

(2) bearing at its rolling body varieties, divided into:
1) ball bearings ---- rolling element ball:
2) roller bearings ---- the rolling body as roller. Roller bearings the press roller varieties are divided into: cylindrical roller bearings ---- rolling body is cylindrical roller bearings, cylindrical roller length to diameter ratio of less than or equal to 3; needle roller bearings --- - rolling body needle roller bearings, needle length and diameter ratio greater than 3, but less than or equal to 5mm diameter; ---- rolling body is tapered roller bearings tapered roller bearings; Spherical Roller bearing rolling elements one by one spherical roller bearings.

(3) whether aligning the imported bearing their task is divided into:
1) Spherical Bearings ---- raceway is spherical, able to adapt to the angular deviation between the two raceways axis and angular motion of the bearing;
2) non-aligning bearing (rigid bearings) ---- the impedance roller bearing axis angle offset between Road.

(4) Bearing the number of rows of rolling elements, divided into:
1) single row bearings ---- with a rolling element bearing;
2) double-row bearings ---- with two rolling element bearings;
3) multi-row bearings ---- with more than two rolling element bearings, such as three, four bearings.

(5) Bearing whether their parts respectively, divided into:
1) respectively bearing ---- have respectively the member of the bearing;
2) is not available, respectively, bearing ---- bearings after the final supporting rings are not any freedom respective bearings.

(6) Bearing its constructor appearance (if any slot loading, whether inside the outer ring and the ferrule shape, ribs structure, even with or without maintaining the frame, etc.) can also be divided into a variety of structure types.

 Rolling size classification bearing their diameter size, divided into:

(1) miniature bearings ---- nominal diameter size scale below 26mm bearings;
(2) small bearing ---- nominal diameter size scale for 28-55mm bearings;
(3) small and medium-sized bearings ---- nominal diameter size scale for 60-115mm bearings;
(4) in the large bearing ---- nominal diameter size scale for 120-190mm bearing
(5) large bearing ---- nominal diameter size scale of 200-430mm bearing;
(6) large bearings ---- nominal diameter size scale of 440mm above the bearing