GB/T 24609-2023Rolling bearings - Thermal speed rating - Calculation (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting:

This document replaces GB/T 24609-2009 "Calculation Methods and Coefficients of Rated Thermal Speed of Rolling Bearings" and is consistent with GB/T 24609-Compared with:2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

a) Changed the order of some symbols (see Table 1, Table 1 of the:2009 version);

b) Changed the format of "Reference Conditions" (see Chapter 5, Chapter 5 of the:2009 edition);

c) Move the "Annotation" chapter to the appendix (see Appendix B, Chapter 7 of the:2009 edition);

d) Move the contents of the appendix "Rated thermal speed of grease-lubricated rolling bearings" to Appendix C (see Appendix C, Appendix B of the:2009 edition):

This document is equivalent to ISO 15312:2018 "Calculation Method for Rated Thermal Speed of Rolling Bearings":

Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:

1 Scope

This document specifies the definition of the rated thermal speed of oil bath lubricated rolling bearings and the calculation principles for determining this parameter: From a tribological point of view See, the parameters determined in this document apply not only to bearings of standard construction of a given series and size, but also to other relevant standard constructions:

Structured bearings:

For most standard components, the heat of the entire component is generated by the bearings, and the maximum operating speed is determined by the allowable temperature:

Due to kinematic effects, the rated thermal speed specified in this document does not apply to thrust ball bearings:

Note 1: Appendix A gives the average value of the coefficients f0r and f1r - f0r is the coefficient for calculating the viscous loss of the oil bath lubricated bearing, and f1r is the coefficient for calculating the friction loss of the bearing:

coefficient:

Note 2: Appendix B gives annotations on the limit criteria:

Note 3: Appendix C determines the reference conditions for grease lubrication: The reference conditions can be selected so that the rated thermal speed for grease lubrication is equal to that for oil bath lubrication:

Thermal speed:

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations for undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document:

ISO 76 Rolling Bearing Static Load Ratings (Rolingbearings-Staticloadratings) Note: GB/T 4662-2012 Static load rating of rolling bearings (ISO 76:2006, IDT) ISO 1132-1 Tolerances for rolling bearings Part 1: Terms and definitions (Rolingbearings-Tolerances-Part 1:

Note: GB/T 4199-2003 Rolling bearing tolerance definition (ISO 1132-1:2000, MOD) ISO 5593 Rolling Bearings Vocabulary (Rolingbearings-Vocabulary) Note: GB/T 6930-2002 Rolling bearing vocabulary (ISO 5593:1997, IDT) ISO 5753-1 Rolling bearing clearance Part 1: Radial clearance of radial bearings (Rolingbearings-Internalclear-Note: GB/T 4604.1-2012 Rolling bearing clearance Part 1: Radial clearance of radial bearings (ISO 5753-1:2009, IDT) Note: GB/T 7811-2015 Rolling bearing parameter symbols (ISO 15241:2012, IDT)

3 Terms and definitions

The terms and definitions defined in ISO 1132-1 and ISO 5593 and the following apply to this document:

The URLs for the terminology databases used in standardization work maintained by ISO and IEC are as follows:

---ISO online browsing platform: https://www:iso:org/obp;

rated thermal speed thermalspeedrating Internal temperature when the heat generated by bearing friction and the heat dissipated through the bearing support surface (shaft and housing) are balanced under reference conditions: