TECHNICAL REPORT

1. ISO Dimensional system and bearing numbers 1.1 1.2 1.3 1.4 1.5 ISO Dimensional system …………………………………………………………… 6 Formulation of bearing numbers…………………………………………………… 8 Bearing numbers for tapered roller bearings (inch system) ………………… 10 Bearing numbers for miniature ball bearings ………………………………… 12 Auxiliary bearing symbols ……………………………………………………… 14 2. Dynamic load rating, fatigue life, and static load rating Dynamic load rating ……………………………………………………………… Dynamic equivalent load ………………………………………………………… Dynamic equivalent load of triplex angular contact ball bearings …………… Average of fluctuating load...

Interference and clearance for fitting (shafts and inner rings) ……………… Interference and clearance for fitting (housing holes and outer rings)……… Interference dispersion (shafts and inner rings) ……………………………… Interference dispersion (housing bores and outer rings) …………………… Fits of four-row tapered roller bearings (metric) for roll necks ……………… Internal clearance ………………………………………………………………… Calculating residual internal clearance after mounting ……………………… Effect of interference fit on bearing raceways (fit of inner ring) …………… Effect of interference fit on bearing raceways (fit of outer ring) ……………...

Position preload and constant-pressure preload ……………………………… Load and displacement of position-preloaded bearings……………………… Average preload for duplex angular contact ball bearings …………………… Axial displacement of deep groove ball bearings …………………………… Axial displacement of tapered roller bearings ………………………………… Preload and starting torque for angular contact ball bearings ……………… Preload and starting torque for tapered roller bearings ……………………… Empirical equations of running torque of high-speed ball bearings ………… Empirical equations for running torque of tapered roller bearings ………… 8. Bearing type...

Pages 10.8 Characteristics of nylon material for cages …………………………………… 220 10.9 Heat-resistant resin materials for cages ……………………………………… 222 10.10 Features and operating temperature range of ball bearing seal material … 224 Calculation Calculation Calculation Calculation Calculation loads on spur, helical, and double-helical gears …………… load acting on straight bevel gears …………………………… load on spiral bevel gears ……………………………………… load acting on hypoid gears …………………………………… load on worm gear ……………………………………………… 12. General miscellaneous information JIS concerning rolling bearings …………………………………………………...

1. ISO Dimensional system and bearing numbers 1.1 ISO Dimensional system The boundary dimensions of rolling bearings, namely, bore diameter, outside diameter, width, and chamfer dimensions have been standardized so that common dimensions can be adopted on a worldwide scale. In Japan, JIS (Japan Industrial Standard) adheres to the boundary dimensions established by ISO. ISO is a French acronym which is translated into English as the International Organization for Standardization. The ISO dimensional system specifies the following dimensions for rolling bearings: bore diameter, d, outside diameter,...

Fig. 1　Cross-sectional profiles of radial bearings by dimensional series Table 1 fD and fB values of radial bearings Diameter series Width series Table 2 fD and fT values for thrust bearings Diameter series Height series