1. Classification of structural types of rolling bearings
　　(1) the bearing direction as it can bear loads or different nominal contact angle, divided into:
　　1) radial spherical plain bearings----mainly for rolling bearing radial load, the nominal contact angle from 0 to 45. Different according to the nominal contact angle, is divided into: radial contact ball bearings----nominal radial bearings with contact angle is 0: radial angular contact bearings----nominal radial bearings with contact angle greater than 0 to 45.
　　2)----main thrust bearing for the axial load of ball bearing, its nominal contact angle greater than 45 to 90. Different according to the nominal contact angle is divided into: axial bearings----a nominal thrust bearings with contact angle is 90:----thrust angular contact bearings the nominal thrust bearings contact angles greater than 45 but less than 90.
　　(2) the type of bearing by rolling, divided into:
　　1)----ball bearing roller ball:
　　2)----rolling roller of roller bearings. Roller bearings are roller types are divided into:----roller of cylindrical roller bearings are cylindrical roller bearings, cylindrical roller length to diameter ratio is less than or equal to 3;----needle bearing rolling elements are needle roller bearings, needle length to diameter ratio is greater than 3, but a diameter less than or equal to 5mm; ----Rolling of tapered roller bearings are tapered roller bearings; One by one the rolling spherical roller bearings are spherical roller bearings.
　　(3) the bearing by whether spherical, divided into:
　　1) spherical bearing----roller conveyors are of spherical shape, able to adapt to two road axis deviation and roller bearing of angular motion;
　　2) non-spherical bearings (rigid bearing)----impedance road axis offset bearings.
　　(4) number of columns bearing by rolling, divided into:
　　1) single row bearing----one column rolling bearing;
　　2)----double row bearings have two rows of rolling bearings;
　　3)----columns bearing with more than two rows of rolling bearings, bearing three columns and four columns.
　　(5) bearing their parts can be separated, divided into:
　　1)----separable bearings bearings with separable parts;
　　2)----inseparable bearing bearing, in the final after matching, isolation bearing rings are not any free.
　　(6) according to their structural shape of the bearing (if there is no filling slots, with or without the shape of the inner and outer rings, and rings and sidewall structure, even without cage) can also be divided into a variety of structure types.
　　2. Press bearing bearing outside diameter size size classification is divided into:
　　(1) micro----a nominal outside diameter of the bearing sizes 26mm bearing;
　　(2) small----a nominal outside diameter of the bearing sizes 28-55mm bearing;
　　(3) small and medium----a nominal outside diameter of the bearing sizes 60-115mm bearing;
　　(4) large----a nominal outside diameter of the bearing sizes 120-190mm bearing
　　(5) large----a nominal outside diameter of the bearing sizes 200-430mm bearing;
　　(6) large bearings bearings----nominal diameter size range for more than 440mm.


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