Detail of GB/T 21559.1-2023

Introduction of GB/T 21559.1-2023

GB/T 21559.1:2023 Rolling bearings - Linear motion rolling bearings - Part 1: Dynamic load ratings and rating life 1 Scope This document specifies methods of calculating the basic dynamic load rating and basic rating life for linear motion rolling bearings as well as the method of calculating life of linear motion rolling bearings and the conditions required for reliable life calculations. This document is applicable to linear motion rolling bearings 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 the rolling contact surfaces. This document is not applicable to designs where the rolling elements operate directly on the slide surface of the machine equipment, unless that surface is equivalent in all respects to the raceway of the linear motion rolling bearing component it replaces. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 281 Rolling bearings - Dynamic load ratings and rating life Note: GB/T 6391-2010 Rolling bearings - Dynamic load ratings and rating life (ISO 281:2007, IDT) ISO 5593 Rolling bearings - Vocabulary Note: GB/T 6930-2002 Rolling bearings - Vocabulary (ISO 5593:1997, IDT) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 281 and ISO 5593, and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: ——ISO Online browsing platform: https://www.iso.org/obp; ——IEC Electropedia: available at: http://www.electropedia.org/.   3.1 recirculating linear ball bearing, sleeve type, with or without raceway grooves basically cylindrical sleeve provided with a number of closed loops of recirculating balls designed to achieve linear rolling motion along a hardened cylindrical shaft Note 1: See Figure 1. Note 2: The raceways in the sleeve can be designed cylindrical as well as steel inserts with raceway grooves parallel to the axis. Figure 1 Recirculating linear ball bearing, sleeve type 3.2 recirculating linear ball (or roller) bearing, linear guideway, carriage type linear ball (or roller) bearing provided with a number of symmetrically arranged, closed loops of recirculating balls (or rollers) designed to achieve linear rolling motion along a hardened guideway furnished with adequate raceways Note: See Figure 2.

Contents of GB/T 21559.1-2023

Foreword I Introduction II 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols 5 Basic dynamic load ratings 6 Dynamic equivalent load 7 Basic rating life Bibliography