1 Scope
This Standard specifies methods of calculating the basic dynamic load rating of rolling bearings within the size ranges shown in the relevant standards, manufactured from contemporary, commonly used, high quality hardened bearing steel, in accordance with good manufacturing practice and basically of conventional design as regards the shape of rolling contact surfaces.
This Standard also specifies methods of calculating the basic rating life, which is the life associated with 90 % reliability, with commonly used high quality material, good manufacturing quality and with conventional operating conditions. In addition, it specifies methods of calculating the modified rating life, in which various reliabilities, lubrication condition, contaminated lubricant and fatigue load of the bearing are taken into account.
This Standard does not cover the influence of wear, corrosion and electrical erosion on bearing life.
This Standard is not applicable to designs where the rolling elements operate directly on a shaft or housing surface, unless that surface is equivalent in all respects to the bearing ring (or washer) raceway it replaces.
Double-row radial bearings and double-direction thrust bearings are, when referred to in this document, presumed to be symmetrical.
Further limitations concerning particular types of bearings are included in the relevant clauses.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Part. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 4662-2003 Rolling Bearings — Static Load Ratings (ISO76:1987, IDT)
GB/T 6930-2002 Rolling Bearings — Vocabulary (ISO 5593:1997, IDT)
GB/T 7811-2007 Rolling Bearings — Symbols for Quantities (ISO 15241:2001, IDT)
ISO/TR 8646:1985 Rolling Bearings — Explanatory Notes on ISO 281/1-19772)
