Rolling Bearings

Content Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 1. Basic Calculations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 1.1 Dynamic Load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 1.1.1 Basic Dynamic Load Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Publication Rolling Bearings shows a survey of standardized rolling bearings and accessories being produced and delivered under designation KINEX. In the design, production, storage and sales of the rolling bearings international standards ISO and national standards are used. Technical section of the publication contains the most important facts concerning calculations, the design data about the arrangement design, lubrication, as well as mounting and dismounting rolling bearings. The produced standardized rolling bearings and accessories in the basic design and in the main applications from...

1.1 Dynamic Load 1.1.1 Basic Dynamic Load Rating Required bearing size is determined by the action of the external forces and according to the bearing required life and its reliability in the arrangement. Magnitude, direction and kind of load acting on the bearing, as well as the operating speed, are decisive for the type and bearing size selection. Other special or impor­ant conditions of each individual arrangement must t be taken into account, e.g. operating temperature, limited space availability, simplicity of mounting, lubrication requirements, sealing, etc., and all of these can influence...

C/P ratio in dependence on life L10 and rotational speed n for ball bearings

In arrangements of the axles of road and railway vehicles the nominal life can be expressed by a revised relation in the volume of kilometers travelled. Equation of Adjusted Life Adjusted life is a corrected nominal life, where by calculation not only of the load but the influence of bearing components, material, physical, mecha­ nical, and chemical qualities of lubricants and the temperature regime of the bearing the operating environment are taken into account. Lna = a1 . a23 . L10 L10km - nominal life D - wheel diameter Reference Nominal Life Values In cases, where the life for a given arrangement...

In the arrangement the bearing is subjected to generally acting forces in various magnitudes, at various rotational speeds and with different acting period. From the point of view of calculation methodology the acting forces should be re-calculated into the constant load, by which the bearing will have the same life as it reaches in the conditions of the actual load. Such a re-calculated constant radial or axial load is called the equivalent load P, or Pr (radial) or Pa (axial). Combined Load The outer forces acting on a bearing are not changed both from the point Constant Load of view of size...

If the actual load has a sine behaviour (Pict. 4), the mean hypothetical load is Change of Load Magnitude by If the bearing is subjected in time to a varying load and the rotational speed Change of Rotational Speed is being changed, the mean hypothetical load is calculated from equation rij = ni,... nn- constant rotational speed in time of partial loads Fi,... Fn acting [min1] qi = qi,... qn - share of partial load and rotational speed acting [%] If in dependence on time only the rotational speed is changed, the mean hypothetical constant rotational speed is calculated from equation Oscillating...

Factor s0 Bearing motion Table 8 Type of load, demands on bearing running distinct impact load, high demands on smooth running after static loading bearing rotates under smaller load normal demands on smooth running normal operating conditions and normal demands on running smooth impact-free operating small oscillation angle with high frequency, with uneven impact loading large oscilating angle with low frequency and with approximately constant periodic load distinct impact load normal and small load, no special demands on bearing operation spherical roller thrust bearings at all kinds of motions...

2. Rolling Bearing Design Data 2.1 Boundary Dimensions Overview of chamfer limiting values according to international standard STN ISO 582 is given in Table 9. Bearings introduced in this publication are made in dimensions complying with the inter­ a­ional standards STN ISO 15, STN ISO 355 and STN ISO 104. n t In the dimensional plan each bearing bore diameter d corresponds to several outer diameters D and various widths are added to them - B or T for radial and H for thrust bearings. Bearings having the same bore diameter and outer diameter belong to one diameter series which is designated according...

An exception create bearings with bore d = 22, 28, and 32 mm, where the double digit number separated by a slash indicates directly the bore diameter in mm, e.g. 320/32AX, further separable single row ball bearings - type E and single row cylindrical roller bearings - type E, where the double digit number, or number indicates directly the bore diameter in mm, e.g.: E20. Bearings with bore diameter d ≥ 500 mm The last three or four digit number separated by a slash indicates directly the bore diameter in mm, e.g. 230/530M, NU29/1060. Bearings produced in different design than standard are designated...

Increased Operation Safety C2 clearance less than normal, e.g. 608 C2 normal clearance (not indicated), e.g. 6204 C3 clearance greater than normal, e.g. 6310 C3 C4 clearance greater than C3, e.g. NU 320 M C4 C5 clearance greater than C4, e.g. 22330 M C5 NA radial clearance for bearings with non-interchangable rings (always after radial clearance symbol), e.g. NU 215 P63 NA R... radial clearance in non-standardized range (range in mm), e.g. 6210A R10-20 A... axial clearance in non-standardized range (range in mm), e.g. 3210 A20-30 C6 reduced vibration level lower than normal (not indicated) e.g....