BS ISO 15312:2018,Rolling bearings – Thermal speed rating – Calculation.BS ISO 15312:2018 pdf can be downloaded for free here.
This second edition cancels and replaces the first edition (ISO 15312: 2003),of which it constitutes a
minor revision with the following changes:
a) the term”coefficients”has been deleted from the title;
b) the normative references have been updated and modified;
c) Formula (11) has been corrected;
d) Clause 7 has been moved to a new informative Annex B;
e) content from Annex B has been moved to a new informative Annex C.
BS ISO 15312:2018 defines the thermal speed rating for oil bath lubricated rolling bearings and defines calculation principles for the determination of this parameter. The parameter determined in accordance with this document applies to rolling bearings of the given series and sizes of standard design or of a design that, from a frictional point of view, can be related to a standard design bearing.
In most cases of standard assembly, the permissible temperature determines the maximum operating speed. Heating of the assembly is then generated by the bearing.
Thrust ball bearings are excluded from this document as kinematic effects do not allow the thermal speed rating defined in this document to be applied.
2 Normative references
ISO 76, Rolling bearings-Static load ratings;
ISO1132-1, Roling bearings-Tolerances- Part 1: Terms and definitions;
ISO 5593, Rolling bearings- Vocabular;
ISO 5753-1, Rolling bearings-Internal clearance- Part 1: Radial internal clearance for radial bearing;
ISO15241, Rolling bearings-Symbols for physical quantities;
6 Calculation of the thermal speed rating
The calculation of the thermal speed rating is based on the energy balance in the rolling bea system under the reference conditions. The frictional heat generated in the bearing under the refere conditions and at the thermal speed rating equals the heat flow emitted from the bearing.

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