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GB/T 25627-2010: Construction machinery -- Power-shift transmissions Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 25627-2010: Construction machinery -- Power-shift transmissions---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/GBT25627-2010GBT25627-2010) ICS 53.100 P 97 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA GB/T 25627–2010 Construction machinery -- Power-shift transmissions Issued on: DECEMBER 1, 2010 Implemented on: MARCH 1, 2011 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 ... 1 1 Scope ... 2 2 Normative References ... 2 3 Symbols and units ... 2 4 Requirements ... 4 4.1 General requirements ... 4 4.2 Appearance requirements ... 4 4.3 Performance requirement ... 4 5 Test methods... 6 5.1 Test equipment ... 6 5.2 Test accuracy and instrument precision ... 6 5.3 Test preparation ... 8 5.4 Test method ... 9 5.5 Test data processing and test report ... 17 6 Inspection rules ... 19 7 Marking, packaging, transportation and storage ... 19 Annex A (Informative) Recommendations for transmissions parts ... 21 Annex B (Normative) Transmissions test record table ... 29 Annex C (Informative) Transmissions test curve example ... 32 Bibliography ... 34 References and Original Chinese Documents ... 36ForewordAnnex A and Annex C of this Standard is informative, Annex B is normative. This Standard is proposed by China Machinery Industry Federation. This Standard is under the jurisdiction of National Technical Committee (SAC/TC 334) on Earthmoving Machine of Standardization Administration of China. The responsible drafting organizations are Hangzhou Advance Gearbox Group Co., Ltd and Tianjin Research Institute of Construction Machinery. The participation drafting organization is Sichuan Chengdu Chenggong Construction Machinery Co., Ltd. The chief drafting staffs of this Standard include Liu Weihui, Wu Runcai, Shang Haibo, Song Bin, Wang Wenlin, Liang Jianzong and Wang Yuning. Construction machinery -- Power-shift transmissions1 ScopeThis Standard stipulates the symbols, units, requirements, test methods, inspection rules, marking, packaging, transportation and storage of the construction machinery -- power-shift transmissions. This Standard is applicable to the construction machinery -- power-shift transmissions of 300kW or less (hereinafter referred to as transmissions). The transmissions above 300kW may refer to this Standard.2 Normative ReferencesThe articles contained in the following documents have become this Standard when they are quoted herein. For the dated documents so quoted, all the modifications (excluding corrections) or revisions made thereafter shall not be applicable to this Standard. For the undated documents so quoted, the latest editions shall be applicable to this Standard. GB/T 2828.1-2003 Sampling procedures for inspection by attributes - Part1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (ISO 2859.1. 1999, IDT) GB/T 3785 Electric, sonic properties and measuring methods for sound level meters GB/T 7680 Torque converters -- Methods of performance tests GB/T 13306 Plates GB/T 14039 Hydraulic fluid power – Fluids -- Method for coding the level of contamination by solid particles GB/T 20082 Hydraulic fluid power-Fluid contamination-Determination of particulate contamination by the counting method using an optical microscope JB/T 5947 Engineering machinery-- Specifications for packaging3 Symbols and unitsSee Table 1 for the testing parameters of the transmissions and the names, symbols and units of the calculation parameters. between failures (MTBF) of the transmissions shall not be less than 150h and the availability (K) shall not be less than 85%.5 Test methods5.1 Test equipment 5.1.1 This Standard recommends to use open-testbed. The benches are comprised of the power machines, loading equipment, fastening and connecting devices and auxiliary systems. 5.1.2 DC motors, DC dynamometers, AC speed control motors and diesel engines may be selected for the power machines. 5.1.3 DC dynamometers, DC generators, AC speed control motors, electric eddy current dynamometers, hydraulic loading system or hydraulic dynamometers may be selected for the loading equipment. Testbed layout is shown in Figure 1. 5.1.4 Auxiliary systems include oil supply system and water supply system. The oil supply system shall satisfy the maximum oil supply pressure and flow-volume at the operation of the transmissions and may be continuously adjusted. Heating and cooling devices shall be installed in the system. Water supply system shall meet the flow-volume requirements and provide adjustable and stable water-flow. 5.1.5 The no-load power loss tests of the transmissions and the transmissions efficiency tests of the transmissions shall use independent oil supply systems. 5.2 Test accuracy and instrument precision 5.2.1 Stabilization precision during the measurement process shall meet the following requirements. —— Test system torque ripple is not greater than ±0.5%; —— The fluctuating value of rotating speed of the test systems shall not be more than ±5r/min. flow-volume of the variable-speed pumps and keep the oil level of the oil pan at the prescribed height. 5.4.2.2 Test procedure for the transmissions with torque converter Test procedure for the transmissions with hydraulic torque converter. a) The input rotating speed during the tests shall keep constant and comply with the stipulations in Table 4; b) At the beginning of the test, first, make the output shaft idle, increase the input rotating speed to the set value and record the data after the running is fully stable; then, gradually load the output shaft as per the set increment, decrease the output rotating speed and keep the output rotating speed constant; c) The interval of the loading torque shall be distributed arithmetically according to the torque of the output shaft and shall be properly reduced near the maximum efficiency and the working status transition points. The interval between the rotating speeds of the output shaft shall not more than one-tenth of the idle rotating speed of the output shaft; d) The minimum value of the output shaft rotating speed of the transmissions is selected at the lowest shift-gear at the zero-sped working condition of the torque converter. The input torque shall be subject to the maximum torque of the matched engine. For other shift-gears, select n2≤0.3n1/iF(R). 5.4.2.3 Test procedures of separate transmissions The following constant rotating speed test methods or constant torque test methods may be adopted. 5.4.2.3.1 Constant rotating speed test. a) Take two input rotating speeds for respective test. The high rotating speed n1=0.8nHe (for over-gear, select n1=0.6nHe). The low rotating speed n1=0.4nHe; b) At the beginning of the test, first, make the power machine idle, increase the input rotating speed to the set value and record the data after the running is fully stable; then, gradually load the output shaft and keep the output rotating speed constant; c) The interval for loading torque is arithmetically distributed in accordance with the input shaft torque; d) The maximum value of the input torque of the transmissions shall be determined according to the input rotating speed, which is subject to the rated power transmitted by the transmissions. 5.4.2.3.2 Constant torque test. a) The input torque of the transmissions takes 2THe, 1.5THe, 1.0THe and 0.5THe respectively; b) Start the power machines and increase the input rotating speed to the rotating speed of the initial test; increase the load to the set value, record data after the running is fully stable, then gradually increase the input rotating speed and keep the input torque constant; c) The initial test rotating speed shall not be less than 600 r/min. The rotating speed interval shall be distributed arithmetically and shall not be more than 200 r/min; d) The maximum value of the input rotating speed of the transmissions shall be determined according to the input torque, which is subject to the rated power transmitted by the transmissions; e) Transmissions efficiency test shall record the following parameters. T1, T2, n1, n2, p1, p2, p3 (or p'3, p''3), p4, p5, t1, t2, Q. The recording of th... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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