Rolling bearings - Methods for calculating the modified reference rating life for universally loaded bearings (ISO/TS 16281:2008 + Cor. 1:2009)
Abstract
This document defines the calculation of the modified reference rating life taking into consideration lubrication, contamination, and fatigue load limit of the bearing material, as well as tilting or misalignment, operating clearance of the bearing and internal load distribution on rolling elements. The calculation method provided in this document covers influencing parameters additional to those described in ISO 281. The general directions and limitations given in ISO 281 apply to this document. The calculation methods pertain to the fatigue life of the bearings. Other mechanisms of failure, like wear or microspalling (gray-staining), lie outside the scope of this document. This document applies to single- and multi-row radial and thrust ball bearings, subjected to radial and axial load and with radial clearance and tilt taken into account. It also applies to single- and multi-row radial and thrust roller bearings, subjected to radial and axial load and with radial clearance, edge stress and tilt taken into account. References to methods for the analysis of the internal load distribution under general load are given. The analysis of internal load distribution and modified reference rating life for bearings of a more complex geometry can be derived from the formulae given in this document. For these bearings, the load distribution for each individual row has to be considered. The calculation of load distribution and basic reference rating life is also applicable to hybrid bearings, using the dynamic load ratings per ISO 20056-1. The calculation of the modified reference rating life is not applicable to hybrid bearings. This document is primarily intended to be used for computer programs and together with ISO 281 covers the information needed for life calculations. For accurate life calculations under the operating conditions specified above, it is recommended that either this document or advanced computer calculations, for determining the dynamic equivalent reference load under different loading conditions, be used.
Begin
2024-04-26
Planned document number
DIN ISO 16281
Project number
11800595
Responsible national committee
NA 118-01-08 AA - Load ratings and rating life
Responsible international committee
ISO/TC 4/SC 8/WG 9 - Bearing calculation methods
