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GB/T 1171-2017: Classical V-belt for general drive Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 1171: Historical versions
GB/T 1171-2017: Classical V-belt for general drive---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1171-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.220.10 G 42 Replacing GB/T 1171-2006 Classical V-belt for general drive Issued on. FEBRUARY 28, 2017 Implemented on. SEPTEMBER 01, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Structures... 4 4 Types and marks... 5 5 Requirements... 6 6 Sampling... 7 7 Test methods... 8 8 Marking, labeling, packaging, transportation and storage... 8 Annex A (informative) Reference rated power P1 and power increment △P1 of a single piece of V-belt... 10ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 1171-2006 “Classical V-belt for general drive”. Compared with GB/T 1171-2006, the main technical changes except editorial modification are as follows. - DELETE the requirements for adapting the rope structure in the scope (see Clause 1 of this Standard, Clause 1 of 2006 edition); - MODIFY the representation method for the mark (see 4.2 of this Standard, 3.3 of the 2006 version); - DELETE the requirements for the adhesion strength of ropes in physical properties and its test methods (see 5.3 of this Standard, 5.3 and 7.3 of 2006 edition); - MODIFY the inspection of the dimensions in the sampling (see 6.1 of this Standard, 6.1 of 2006 edition); - ADD the tables of reference rated power P1 and power increment ΔP1 of a single piece of V-belt (see Annex A). This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of Subcommittee on Friction-type Belt Drive of National Technical Committee on Pulleys and Belts of Standardization Administration of China (SAC/TC 428/SC 3). Drafting organizations of this Standard. Sanlux Co., Ltd., Zhejiang Sanwei Rubber Item Co., Ltd., Zhejiang Hongda Rubber Co., Ltd., Wuxi Zhonghui Rubber Technology Co., Ltd., Ningbo Kaichi Rubber Belts Co., Ltd., Qingdao Product Quality Supervision and Testing Research Center. Main drafters of this Standard. Shi Shuixiang, Liu Youliang, Dai Jianqiu, Zhu Shusheng, Ying Jianli, Li Xiaodong. The previous released versions replaced by this Standard are as follows. - GB 1171-1974, GB 1171-1989, GB/T 1171-1996, GB/T 1171-2006. Classical V-belt for general drive1 ScopeThis Standard specifies the structure, types and marks, requirements, sampling, test methods and marking, labeling, packaging, transportation and storage of classical V-belts (hereinafter referred to as V-belts) for general drive. This Standard applies to classical V-belts used for general mechanical drive devices. This Standard does not apply to mechanical drive devices such as automobiles and motorcycles.2 Normative referencesThe following referenced documents are indispensable for the application 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. GB/T 3686 Belt drives - V-belts and V-ribbed belts - Tensile strength and elongation test method GB/T 11544 Belt drives - Classical and narrow V-belts - Dimensions (system based on datum width) GB/T 12833 Rubber and plastics - Analysis of multipeak traces obtained in determinations of tear strength and adhesion strength3 Structures3.1 V-belts are divided into two types according to the structure. wrap-edge V- belt, cut-edge V-belts (classical cut-edge V-belts, grooved cut-edge V-belts and bottom-rubber-embedded-cloth cut-edge V-belts).4 Types and marks4.1 Types The V-belt shall have a symmetrical trapezoidal cross-section, of which the ratio of height to pitch width is about 0.7.It is divided into seven types. Y, Z, A, B, C, D and E.5 Requirements5.1 Appearance quality The appearance quality of V-belts shall comply with the specifications of Table 1. 5.2 Dimensions The reference length limit deviation, exposed height, center distance variation, and matching difference of V-belts shall comply with the specifications of GB/T 11544. 5.4 Fatigue performance For A-type and B-type V-belts, the torque-free fatigue life is not less than 1.0 × 107 times, and the 24 h center-to-center distance change rate is not more than 2.0 %.6 Sampling6.1 V-belts shall be inspected for appearance quality one by one. They may be sampled for inspection of dimensions. 6.2 The V-belts of the same type and the same material shall be in a batch of not more than 200000 pieces. 6.3 If there are any unqualified items in the appearance quality, dimensions and physical properties of V-belts, double-quantity samples shall be taken in this batch to re-test the unqualified items. 6.4 For A-type and B-type V-belts of the same type and the same material, two samples shall be taken for the fatigue test of V-belts. If there is any unqualified item, two additional samples shall be taken in the batch. 6.5 In the event of changing the line of production, transferring the factory, resumption of production after production stoppage, or a major change in structure, material or process, the V-belts shall be subjected to the type inspection.7 Test methods7.1 For the appearance quality of V belts, the damage of the angled canvas and the length of the flash are measured with a tape or a caliper, and the rest are checked by visual inspection. 7.4 For the adhesion strength test between cloth and top rubber, first cut two samples on the top of the V-belt. 7.5 The no-torque fatigue life and pulley center-to-center distance change rate of V-belts is tested in accordance with the specifications of GB/T 15328.8 Marking, labeling, packaging, transportation and storage8.1 Marking Every V-belt shall be marked with clear sign that can't be washed away, which shall include at least the following. 8.2 Labeling and packaging V-belts shall be packed in suitable packages. The label shall include at least the following. 8.3 Transportation and storage 8.3.1 During transportation and storage, V-belts shall be kept away from direct sunlight or rain and snow, and kept clean; 8.3.2 During storage, the warehouse temperature should be kept at -18 °C ~ 40 °C, and the relative humidity should not exceed 70 %.Annex A(informative) Reference rated power P1 and power increment △P1 of a single piece of V-belt When the wrap angle is 180° (i = 1), the specific reference length and load are stable, the recommended values of the reference rated power of a single piece of V-belt are shown in Table A.1 to Table A.7. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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