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GB/T 20736-2025: Fatigue test method for transmission precision roller chains and leaf chains
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GB/T 20736-2025: Fatigue test method for transmission precision roller chains and leaf chains

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ICS 21.220.30 CCSJ18 National Standards of the People's Republic of China Replaces GB/T 20736-2006 Fatigue testing methods for precision roller chains and plate chains used in transmission (ISO 15654.2015, IDT) Published on 2025-12-02 Implemented on July 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface V 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Experimental Principles 2 5.Test equipment 2 5.1 Testing Machine 2 5.2 Test Fixture 3 6 Sample 3 7.Experimental Procedure 4 7.1 Test Load 4 7.2 Verification Test 5 7.3 Lifting and lowering method test 5 8.Analysis of test data from the lifting method 7. 8.1 Experimental Data 7 8.2 Plotting the experimental data for the lifting method 7 8.3 Statistical Analysis 7 9.Test Results Report 8. 9.1 Test Chain Information 8 9.2 Test Equipment and Procedures 8 9.3 Test Results of Verification Test and Lifting/Lowering Method Test 8 Appendix A (Informative) Survival Tests with Simplified Bias Analysis 9 A.1 Principle 9 A.2 Description 9 A.3 Test Procedure 9 A.4 Analysis Procedure 10 A.5 Determine the step size 11 A.6 Example 11 Appendix B (Informative) Comprehensive Test Method (CTM) 13 B.1 Experimental Objective 13 B.2 Description of the test methods 13 B.3 Test Procedure 13 B.4 Analysis Procedure 14 B.5 RFN curve 15 B.6 Test Report Example 15 Appendix C (Informative) Explanation of Increasing the Fatigue Limit by One Step in the Lifting Method Analysis 19 C.1 Introduction 19 C.2 Analysis 19 C.3 Conclusion 21 Appendix D (Informative) An additional "fictitious" point 22 is added to the endpoint of the elevation/lowering method test. Appendix E (Informative) Fatigue Test Report 23 E.1 Overview 23 E.2 Test results expressed in tables 23 E.3 Experimental Results Expressed Graphically 24 E.4 Test Report Example 25 Appendix F (Informative) Establishment of Rated Fatigue Application Data for Chains 29 F.1 Overview 29 F.2 Evaluation Method 29 F.3 Other Factors 30 F.4 Calculation Example 33 Appendix G (Informative). Based on data from 3 × 10⁶ load cycles, estimate the fatigue strength at 10⁷ cycles. G.1 Introduction 34 G.2 Test Data 34 G.3 Draw the rising and falling graph 34 G.4 Analysis of the Lifting and Lowering Method Test 36 Appendix H (Informative) Finite Life Tests and Data Analysis 38 H.1 Introduction 38 H.2 Test Procedure 38 H.3 Data Analysis 38 H.4 Test Example 40 References 43 Figure 1.Typical load cycle diagram 1 Figure 2.Schematic diagram of the connection between the chain sample and the universal clamp. 3 Figure 3.Jiang Sen-Goodman Curve 4 Figure A.1 Deviation Analysis 12 Figure B.1 Example 18 of the test results Figure C.1 Fatigue data analysis of the 80 chain 21 Figure E.1 Illustrations of the 80-chain lifting method test and finite life test (lgF-lgN diagram) 27 Figure F.1 shows the adjusted probability Z(AN) corresponding to the sample size N. Figure F.2 Example 33.Chain fatigue test rise and fall diagram for 30 tests. Figure G.1 Example 35 of fatigue test lifting diagram for 80 chain Figure G.2 Example 36.Histogram of 80 chain fatigue test Figure H.1 Typical F-lgN in finite life test of 80 chain Figure 42 Figure H.2 Typical lgF-lgN in finite life test of 80 chain Figure 42 Table 1.Symbols, Terms, Definitions, and Units 2 Table 2.Sample Size Requirements 6 Table 3.Test Data Table for the Lifting and Lowering Method (Example) 7 Table A.1 Distribution of specimen quantity under five load levels 9 Table A.2 Distribution of specimen quantity under four load levels 10 Table A.3 Experimental Results 11 Table A.4 Survival test data and bias analysis 11 Table C.1 Analysis of experimental data on the lifting method for a 50-chain with 4 steps 19 Table C.2 Analysis of experimental data on the lifting method for an 80-chain with 4 steps 19 Table C.3 Analysis of experimental data on the lifting method for an 80-chain with 3 steps 20 Table C.4 Analysis of test data for the lifting method of a 120 chain with 5 steps 20 Table F.1 Adjusted probabilities AN corresponding to sample size N 32

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 supersedes GB/T 20736-2006 "Fatigue Test Method for Precision Roller Chains for Transmission", and is consistent with GB/T 20736-2006. Compared to previous versions, aside from structural adjustments and editorial changes, the main technical changes are as follows. ---A fatigue testing method for multi-row roller chains has been added (see 7.3.5.3); ---Fatigue testing methods for plate chains have been added (see 5.2, 7.3.5.3, Appendix E, Appendix F, Appendix G, Appendix H); ---Changed from "The maximum working capacity of the testing machine is equal to or 10% greater than the maximum load applied to the specimen" to "The specifications of the testing machine should be selected..." The maximum test load applied to the chain specimen is greater than or equal to 10% of the maximum working capacity of the testing machine (see 5.1,.2006 edition). (5.1) ---Added requirements for the bore diameter of plate chain chucks (see 5.2); ---Added schematic diagrams for double-row roller chains and plate chains (see Figure 2); ---Added calculation formulas and corresponding explanations for step length of multi-row roller chains and plate chains (see 7.3.5.3); ---Chain numbers 10A, 16A, and 24A were changed to chain numbers 50, 80, and 120 (see Appendix C, Appendix C of the.2006 edition); ---A "Minimum Dynamic Load Requirement" column has been added to the chain attributes of the fatigue report form (see Appendix B, Appendix E, Appendix H); ---A sample verification test report form has been added (see Appendix E.4). This document adopts ISO 15654.2015 "Fatigue test methods for precision roller chains and plate chains for transmission". Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee on Standardization of Chain Drives (SAC/TC164). This document was drafted by. Jilin University Chain Transmission Research Institute, Hangzhou Donghua Chain Group Co., Ltd., and Huanqiu Transmission Taizhou Co., Ltd. Zhejiang Hengjiu Transmission Technology Co., Ltd., Qingdao Zhenghe Industrial Co., Ltd., Jiangsu Shuangling Chain Transmission Co., Ltd., Shanghai Yuanlong Chain Transmission Co., Ltd., Hangzhou Shield Chain Co., Ltd., Shanghai Dalong Chain Factory Co., Ltd., Hangzhou Chizheng Technology Co., Ltd., National Chain Quality Inspection and Testing Center, Anhui Huangshan Hengjiu Chain Transmission Co., Ltd., Donghua Chain Xinghua Co., Ltd., Jiangshan Yongli Baihe Industry Co., Ltd. The company is Jiangsu Huapu Testing Technology Co., Ltd. The main drafters of this document are. Wang Haiou, Lu Jiguang, Wang Lili, Liu Jiaqiang, Huang Qing, Fu Zhenming, Li Feng, Wu Qiang, Xu Weili, and Xu Guanjun. Zhang Shiqiang, Xu Shuxin, Zhou Jian, Yang Xiaoyong, Zheng Jinbo, Ren Zhongming. The release history of this document and the document it replaces is as follows. ---First published in.2006 as GB/T 20736-2006 "Fatigue Test Method for Precision Roller Chains for Transmission"; ---This is the first revision. Fatigue testing methods for precision roller chains and plate chains used in transmission

1 Scope

This document specifies the method for conducting axial loading fatigue tests on roller chains and plate chains used in transmissions. The tests are conducted at room temperature, along the chain... An alternating tensile load is applied longitudinally to the strip. This document also specifies the statistical analysis methods for the test results, as well as the fatigue test results and analysis reports. The format.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 6074-2025 Plate chains, connecting links and pulleys—Dimensions, measuring forces, tensile loads and dynamic loads (ISO 4347. 2015, IDT) Note. GB/T 1243-2024 Short-pitch precision roller chains, bushing chains, accessories and sprockets for transmission (ISO 606.2015, IDT) ISO 4347 Leaf chains, connecting links and pulleys - Dimensions, measuring forces, tensile strength and dynamic load strength ISO 10190 Technical conditions and test methods for motorcycle chains Note. GB/T 14212-2010 Technical conditions and test methods for motorcycle chains (ISO 10190.2008, IDT)

3 Terms and Definitions

Symbols, terms, definitions and units are shown in Figure 1 and Table 1. Figure 1 Typical load cycle diagram ...