GB/T 5269-2008 in English

《GB/T 5269-2008传动与输送用双节距精密滚子链、附件和链轮》由TC164（全国链传动标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了适用于机械动力传动和输送用双节距精密滚子链条及配用链轮的技术要求，内容包括尺寸、公差、长度测量、预拉和最小抗拉强度。双节距链条是由GB/T 1243传动用短节距精密滚子链派生出来的，节距是其两倍，其余互换性尺寸相同。本标准是对GB/T 《传动与输送用双节距精密滚子链、附件和链轮》的修订。
本标准与GB/T 5269-1999相比主要技术内容变化如下：
――增加了图ld)带卡簧的连接链节；
――对3.4做了技术修订，调整了部分内容；
――对3.5做了技术修订，将原来的预拉载荷值为最小抗拉强度的1/3调整为30%；
――对原表1~表3中的部分数据进行了调整；
――新增了M1、M2型附件，X和Y型加长销轴及所对应的图（图6~图9）与表（表4~表6）；
――调整了4.5的规定，将带有附件的链长公差由原来的+00.25%调整为00.30%，同时增加了对平行传动链条链长精度的选配要求。
――新增了4.7.5对附板制造的要求；
――新增了5.6对链轮孔径公差的要求；
――将原标准5.6对齿数范围的规定移至第1章适用范围。

Double-pitch precision roller chains, attachments and associated chain sprockets for transmission and conveyors

1 Scope

This standard specifies requirements for double-pitch precision roller chains suitable for the mechanical transmission of power and for conveyors, together with those for their associated sprockets. It covers dimensions, tolerances, length measurement, preloading and minimum tensile strengths.

These double-pitch chains have been derived from some of the short-pitch transmission precision roller chains covered by GB/T 1243 having certain common dimensions but of double the pitch.

The chains are intended for use under less onerous conditions with respect to speed and power transmitted than are the base chains from which they are derived.

This standard primarily applies to sprockets with 5 to 75 teeth inclusive (with intermediate numbers of teeth 5½ to 74½ inclusive).

The preferred numbers of teeth are 7, 9, 10, 11, 13, 19, 27, 38 and 57.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards indicated below. For undated references, the latest edition of the normative document applies.


GB/T 1800.3 Limits and fits - Bases - Part 3: Numerical values tables of standard tolerances and fundamental deviations (GB/T 1800.3-1998, eqv ISO 286-1:1988)
GB/T 1243 Short-pitch transmission precision roller and bush chains attachments and associated chain sprockets (GB/T 1243-2006, ISO 606:2004, IDT)

3 Transmission chains

3.1 Assembly and component nomenclature

The nomenclature of the chain assemblies and their component parts is illustrated in Figures 1 and 2.

Note: The figures do not define the actual form of the chain plates.
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Foreword i
ISO introduction iii
1 Scope
2 Normative references
3 Transmission chains
3.1 Assembly and component nomenclature
3.2 Designation
3.3 Dimensions
3.4 Tensile testing
3.5 Preloading
3.6 Length validation
3.7 Marking
4 Conveyor chains
4.1 General
4.2 Nomenclature
4.3 Designation
4.4 Dimensions
4.5 Length validation
4.6 Marking
4.7 Attachments
5 Sprockets
5.1 Nomenclature
5.2 Diametral dimensions and tooth shape
5.3 Radial run-out
5.4 Axial run-out (wobble)
5.5 Pitch accuracy of sprocket teeth
5.6 Bore tolerance
5.7 Marking
Annex A (normative) Pitch circle diameters