This rolling bearing calculation (Version 12/2017) calculates the load distribution, the reference life and the modified reference life according ISO/TS 16281 (DIN 26281) for the following types of bearings:
•Deep groove radial ball bearings
•Double row deep groove ball bearings
•Axial deep groove ball bearings
•Radial angular contact bearings
•Axial angular contact bearings
•Double row radial angular contact bearings
•Double row axial angular contact bearings
•Single row spherical ball bearings
•Double row spherical ball bearings
•Four-point ball bearings considered as radial bearings
•Four-point ball bearings considered as axial bearings
•Duplex ball bearings
•Radial cylindrical roller bearings
•Double row radial cylindrical roller bearings
•Axial cylindrical roller bearings
•Barrel roller bearings
•Tapered roller bearings
•Double row tapered roller bearings
•Axial tapered roller bearings
•Radial spherical roller bearings
•Axial spherical roller bearings
•Cross roller bearings considered as radial bearings
•Cross roller bearings considered as axial bearings
•Angular roller bearings considered as radial bearings
•Angular roller bearings considered as axial bearings
Additional bearing types will be added in the future.
The inner geometry of the bearings can be approximated by the software or provided by the user. The operating clearance can be specified. The influence of interference fits, temperature and centrifugal load on the clearance can be taken into account. Centrifugal loads and gyroscopic moments on the rolling elements can be considered for ball bearings only.
In extension of ISO/TS 16281 the influence of reduced material hardness can be considered according NREL guideline DG03. This includes a check of the case core interface.
The lubricant film thickness can be calculated by the software. This is done according to Harris: Rolling bearing elements.
The loading can be specified as force/moment or displacement/rotation independently for each of the five degrees of freedom. Bearing sets can be defined by using a configuration with multiple rows. This can be used for spindles or multiple row cylindrical roller bearings.
The following results can be found in the report:
•Reference life according ISO/TS 16281
•Modified reference life according ISO/TS 16281
•Basis life and modified life according ISO 281 for comparison
•Load distribution between rolling elements
•Reaction forces/moments and displacements/rotations
•Contact pressure for each contact
•Required shoulder height for contact ellipsis in ball bearings
•Static safety factor
•Maximum subsurface shear stress and stress at case core interface
•Load dependent friction torque for ball bearings based on coulomb friction
•Change to clearance because of interference fit and temperature
•Wear parameters like PV and QV for ball bearings
In addition to the report, the results are shown in several graphics. Report and user interface are both available in metric or US customary units. Supported languages for user interface and report are English, German, French, Spanish, Chinese and Korean.
Parameter variations can be made using ranges for several parameters. The results of parameter variations are given as tables or graphics. Proposals are provided for several inputs and conversions like axial clearance in radial clearance are possible.
Elastic deformations of the outer ring can be considered with an extension of the base software. The loading can be specified on several points in radial, axial or tangential direction and the life and load distribution are calculated with a deformed outer ring. The main use of this feature is for track rollers but also deformations in a planetary gear as outer ring can be considered. The elastic outer ring can be considered with following bearing types: Deep groove ball bearing, radial angular contact bearing, four-point ball bearing, radial cylindrical roller bearings and double row tapered roller bearings. Multi row bearings can be considered using bearing configurations.