This part of GB/T 21559 specifies methods of calculating the basic static load rating, static equivalent load and static safety factor for 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 part of GB/T 21559 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 normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 21559. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. 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 (ISO 76:1987, 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)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 4662-2003, GB/T 6930-2002 and the following apply.
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
See Figure 1.
Note: The raceways in the sleeve can be cylindrical in design as well as the steel inserts with raceway grooves parallel to the axis.
3.2
recirculating linear ball[roller]bearing, linear guideway type
linear ball [roller] bearing provided with a number of symmetrically arranged, closed loops of recirculating balls (rollers) designed to achieve linear rolling motion along a hardened guideway furnished with adequate raceways
See Figure 2.
