Classification of rolling bearings: rolling bearing structure type classification bearing load Fangxiang Gong said contact angle is divided into radial bearings is mainly used to bear radial load rolling bearing nominal contact angle of the nominal contact angle is divided into radial contact bearing male called contact angle bearing to the heart to the heart contact bearings nominal contact angle is greater than the radial bearings thrust bearing to withstand the axial load Rolling nominal 2002: machine tools, the WTO is a challenge even more opportunities for the experts pointed out the need to increase the CNC machine tools in China R & D efforts to accelerate the development of the popular CNC machine tools Rambling China Status and Prospects of the machine tool manufacturing industry competitive Chinese market of milling machines and machining centers at home and abroad lathe technical level and the development direction of the world production of machining centers, demand and development trend of domestic and international machine tool development trends in the world of CNC system development trend of cutting technology and CNC the development of machine tools. Classified according to the type of rolling bearing structure (1) bearing said different contact angle, divided into: 1) radial bearings ---- mainly used for rolling bearings to withstand radial loads, the nominal contact angle according to the direction or the public can bear the load from 0-45. 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) the thrust bearing ---- mainly used for rolling bearing axial load and the nominal contact angle of greater than 45-90. Nominal contact angle is divided into: axial contact bearings ---- nominal contact angle 90 of the thrust bearings: angular contact thrust bearings ---- nominal contact angle greater than 45 but less than 90 of the thrust bearing. (2) bearing according to the type of rolling element is divided into: 1) ball bearings ---- rolling element ball: 2) roller bearings ---- rolling element is a roller. Roller bearings according to the type of roller is divided into: Cylindrical Roller Bearings ---- rolling body is a cylindrical roller bearings, cylindrical roller length and diameter ratio of less than or equal to 3; Needle Roller Bearings --- - The rolling body is a needle roller bearings, needle length and diameter ratio greater than 3, but the diameter is less than or equal to 5mm; Tapered Roller Bearings ---- rolling element is a tapered roller bearing; Spherical Roller The bearings 11 rolling element is a spherical roller bearing. (3) when the bearing of their work whether aligning divided into: 1) aligning bearing ---- raceway is spherical shaped to adapt to the angular deviation between the two raceway axis line and the angular motion of the bearing; 2) non-aligning bearings (rigid bearings) ---- impedance of the line angle offset between the axis of the raceway of the bearing. (4) bearing the number of columns of rolling element is divided into: 1) single row bearings ---- with a rolling element bearings; 2) double-row bearings ---- with two rolling element bearings; 3) multi-column ---- bearing more than two rolling element bearings, such as three, four bearings. (5) bearing according to their components can be separated, divided into: 1) separable bearings ---- bearings with separable components; 2) can not be separated bearing ---- bearing in the final matching rings are not arbitrarily free separation of the bearing. (6) bearing their structure and shape (if no slot loading, whether within the outer ring and the ring shape, the structure of the ribs, or even whether the cage, etc.) can also be divided into a variety of structural types. Bearing Roller Bearing size classification according to the diameter size, divided into: (1) miniature bearings ---- nominal diameter size range of 26mm below the bearings; (2) small bearings ---- nominal diameter size range 28-55mm bearings; (3) small and medium-sized bearings ---- nominal diameter size range of 60-115mm, the bearing; (4) large bearings ---- nominal diameter size range of 120-190mm bearing (5) large bearings ---- nominal diameter size range of 200-430mm bearings; (6) large bearings ---- nominal diameter size range of 440mm above the bearing. Many rolling bearing types and sizes in order to facilitate the design and selection of the standard provisions of the Code, said rolling bearing type, size, structural characteristics and tolerance class. National standards: GB/T272-93 (to ISO rely) (instead of GB272-88), the composition of the Rolling code shown in the table. The rolling bearing code represents the method code use: characterization of the rolling bearing structure, size, type, precision, and the provisions of the Code by the National Institute of Standards GB/T272-93. Code - the composition of the Code: Prefix - said bearing sub-components, the basic code - bearing type and size of the main features of said bearing inner diameter of the accuracy of the material characteristics code: inner code × 5 = inner diameter of the special situation: d = 10 12 15 17 code is: 00010203 Dimension series code: used to express the same diameter but different outside diameter and width of the bearing, see right. OD Series Code: light weight (0,1), light (2), (3), weight (4) width series code: normal width to "0", usually not marked. Tapered roller bearing (3) and self-aligning roller bearings (Class 2) can not omit the "0"


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