Rolling bearings Roller or rolling bearings are those in which rolling elements are arranged between two pieces that move with relative motion. All types of rolling bearings consist of an inner ring, an outer ring and rolling elements (balls, cylindrical rollers, needle rollers, tapered rollers and spherical rollers). The rolling elements are guided by a cage that keeps them at a uniform distance from each other and prevents reciprocal contact; in the case of radial self-aligning bearings, it also ensures that the axis of the rolling elements is positioned correctly. Depending on specific requirements, the bearings can be supplied with side shields or seals. The rolling bearings are classified according to the SHAPE OF THE ROLLING ELEMENTS, to the DIRECTION OF THE LOAD, to the FLEXIBLE DEFORMATIONS of the SHAFT and to the NUMBER OF ROWS. Generally speaking, they comprise the following types: Rolling bearings Load direction Alignment capacity Number of rows Ball Radial Stiff/Oscillating 1 row /2 rows Axial Stiff/Oscillating 1 row Oblique Stiff 1 row /2 rows Cylindrical rollers Radial Stiff 1 /2 / 4 rows Axial Stiff 1 row /2 rows Tapered rollers Radial / Axial Stiff 1 row /2 rows Spherical rollers Radial Oscillating 1 row /2 rows Axial Oscillating 1 row Needle rollers Radial Stiff/Oscillating 1 row /2 rows Axial Oscillating 1 row Combined Oscillating 2 rows CHOOSING THE TYPE AND SIZE OF BEARING The choice of the right type of bearing is mainly dictated by its constructional features, which make it more or less suitable for a given application. First and foremost, one has to consider its size and the load that the bearing has to carry. The size and the load are often tied to the application as a whole, which may involve certain limits and conditions that consequently breakdown the field of choice. It is impossible to lay down general rules for the choice of a bearing, because many factors have to be taken into consideration and which are all related to the conditions and types of use of the bearing. Some focus points may however be pinpointed, which can be referred to based on the application involved. Therefore, when choosing the right type of bearing, it is important to know and evaluate the available space, the working conditions and the loads involved, as well as the operating speed, durability requirements and other factors concerning the operating conditions (noise, vibrations, dusty workplace, high temperatures and so forth). EMMEVB Quick Reference Guide Group Products Special products MY TRM News Contacts TRM - Technology in motion Cambia lingua entire website the product series Rolling bearings Accessories Axial bearing Combined bearings Cylindrical roller bearings Housing units Inserts Radial needle roller bearings Self-aligning ball bearings Self-aligning roller bearings Stiff ball bearings Tapered roller bearings Linear systems Complementary parts Discover My TRM world The advantages of registering with MyTRM: Stock check 24-H Service Direct online technical assistance Download exploded drawing views Special product offers Access your personal area Not registered yet? Click here TRM s.r.l. | Via 2 Agosto 1980, n. 29 - CAP 40016 - San Giorgio di Piano (BO) |P.IVA / VAT 00672091204|Tel. (+39) 051 664.09.45|Fax (+39) 051 664.09.49