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/.
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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.
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
GB/T 21559.1-2023 滾動軸承 直線運動滾動支承 第1部分：額定動載荷和額定壽命
1 范圍
本文件規定了直線運動滾動支承基本額定動載荷和基本額定壽命的計算方法，以及直線運動滾動支承壽命的計算方法和可靠的壽命計算所需的條件。
本文件適用于采用現代常用、高質量淬硬軸承鋼，按良好加工方法制造，且滾動接觸表面的形狀基本上為常規設計的直線運動滾動支承。
本文件不適用于滾動體直接在機械設備的光滑表面上運轉的設計，除非該表面在各方面與其所代替的直線運動滾動支承零部件的滾道相當。
2 規范性引用文件
下列文件中的內容通過文中的規范性引用而構成本文件必不可少的條款。其中，注日期的引用文件，僅該日期對應的版本適用于本文件；不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。
ISO 281 滾動軸承 額定動載荷和額定壽命(Rolling bearings—dynamic load ratings and rating life)
注：GB/T 6391—2010 滾動軸承 額定動載荷和額定壽命(ISO 281：2007， IDT)
ISO 5593 滾動軸承 詞匯(Rolling bearings—Vocabulary)
注：GB/T 6930—2002 滾動軸承 詞匯(ISO 5593：1997， IDT)
3 術語和定義
ISO 281和ISO 5593界定的以及下列術語和定義適用于本文件。
ISO和IEC維護的標準化工作中使用的術語數據庫網址如下：
——ISO在線瀏覽平臺：https：//www.iso.org/obp；
——IEC電工百科：http：//www.electropedia.org/。
3.1
有或無溝道套筒型循環球直線軸承 recirculating linear ball bearing， sleeve type， with or without raceway grooves
為實現沿淬硬圓柱形軸作直線滾動運動而設計的具有若干循環球封閉滾道的基本圓柱形套筒。
注1：見圖1。
注2：套筒上的滾道能被設計為圓柱形或具有平行于軸線的溝道的鋼制嵌塊。
圖1 套筒型循環球直線軸承
3.2
滑塊型循環球(或滾子)直線導軌支承 recirculating linear ball (or roller) bearing， linear guideway， carriage type
為實現沿設有相應滾道的淬硬導軌作直線滾動運動而設計的具有若干循環球(或滾子)的對稱、封閉滾道的直線球(或滾子)支承。
注：見圖2。
圖2 滑塊型循環球(或滾子)直線導軌支承
3.3
深溝型非循環球直線導軌支承 non-recirculating linear ball bearing， linear guideway， deep groove type
用球作滾動體，每個球有兩個接觸點的直線支承。
注1：見圖3。
注2：兩導軌的溝道截面半徑相等，且在0.52Dw～＋∞之間。
圖3 深溝型非循環球直線導軌支承
3.4
四點接觸型非循環球直線導軌支承 non-recirculating linear ball bearing， linear guideway， four-point-contact type
用球作滾動體，每個球有四個接觸點的直線支承。
注1：見圖4。
注2：兩導軌上四個接觸點的溝道截面半徑相等，且在0.52Dw～＋∞之間。
圖4 四點接觸型非循環球直線導軌支承
3.5
平型非循環滾子直線導軌支承 non-recirculating linear roller bearing， linear guideway， flat type
用滾針或圓柱滾子作滾動體的直線支承。
注：見圖5。
圖5 平型非循環滾子直線導軌支承
3.6
V型非循環滾子直線導軌支承 non-recirculating linear roller bearing， linear guideway， V-angle type
導軌為90°V型構件的直線支承。
注1：見圖6。
注2：常用滾針或圓柱滾子作滾動體。
圖6 V型非循環滾子直線導軌支承
3.7
交叉滾子型非循環滾子直線導軌支承 non-recirculating linear roller bearing， linear guideway， crossed roller type
圓柱滾子交叉排設的直線支承。
注：見圖7。
