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GB/T 34586-2017: Road vehicles - Spark-plugs for gas engines - Test methods and requirements 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 34586-2017: Road vehicles - Spark-plugs for gas engines - Test methods and requirements---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/GBT34586-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.060.50 T 37 Road vehicles - Spark-plugs for gas engines - Test methods and requirements Issued on: OCTOBER 14, 2017 Implemented on: JULY 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PRC; Standardization Administration of the PRC. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Test methods and requirements ... 4 4 Inspection rules ... 14 Appendix A (Informative) Names of the parts of spark-plug ... 17 Road vehicles - Spark-plugs for gas engines - Test methods and requirements1 ScopeThis Standard specifies the test methods and requirements for the mechanical and electrical properties of spark-plugs for ignition gas engines of road vehicles. This Standard applies to spark-plugs for ignition gas engines (including oil-gas dual-fuel engines). Note. Gases include compressed natural gas (CNG), liquefied petroleum gas (LPG), liquefied natural gas (LNG), and other combustible gases.2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 3177 Geometrical product specifications (GPS) - Inspection of plain workpiece sizes GB/T 6791 Road vehicles - Spark-plugs and their cylinder head housing - Basic characteristics and dimensions3 Test methods and requirements3.1 General 3.1.1 Test conditions Unless otherwise specified, all tests of spark-plug shall be carried out at room temperature (23±5)°C and normal humidity (65±20)%. 3.1.2 Regulations for names of parts of spark-plug See Appendix A for the names of the parts of spark-plug involved in the following test items. 3.2 General characteristics 3.2.1 Test method USE visual inspection to check the requirements specified in 3.2.2. Visual inspection refers to the inspection using the naked eye (normal vision and color discrimination ability) within the most comfortable judge distance under suitable lighting conditions. 3.2.2 Requirements Spark-plug shall meet the following characteristics. a) The outer sealing washer shall be free of gaps and obvious damage. b) The heat capacity chamber must be clean and free of foreign matter. c) The center and side electrodes shall be in the correct positions. d) The housing is not allowed to have visible corrosion, no burrs and damage to the threads. The housing and the insulator shall be reliably fixed without abnormalities. e) The insulator must be smooth and consistent. There must be no abnormal phenomena such as breakage, cracking, or impact bruise. f) The identification shall be clear and consistent and meet the manufacturer’s or client’s requirements. 3.3 Sizes 3.3.1 Test methods The size inspection method shall meet the requirements of GB/T 3177. 3.3.2 Requirements The size inspection items shall be determined by the manufacturer of spark- plug. Key sizes shall comply with the provisions of GB/T 6791 or conform to the client agreement, such as installation height, hexagonal size, thread size, electrode gap, etc. 3.4 Mechanical properties 3.4.1 Housing mechanical strength 3.4.1.1 Test device Table 3 -- Resistance value at room temperature and normal humidity (in ohms) Types Resistance value Conductive spark-plug ≤5 Resistor type spark-plug 1000~9000 3.7.2 Flashover property 3.7.2.1 Test method According to the mounting torque specified in GB/T 6791, install the spark-plug, as shown in Figure 5, on the appropriate air chamber device. Compressed air of (2±0.2)MPa [(20±2)bar] is applied to the air chamber, to test the flashover voltage of the spark-plug at higher air pressure. At the connecting screw, LOAD a 50 Hz pulse voltage. The pulse voltage rise rate shall be greater than 600 V/μs. The open circuit peak voltage shall be above 40 kV. Then USE the flashover voltage measurement and analysis equipment to detect the flashover situations and flashover voltage of the spark- plug under high air pressure conditions. 3.7.2.2 Requirement Under a compressed air condition of (2±0.2)MPa [(20±2)bar] for 30 s, at the spark-plug gap, a continuous spark shall be generated; and the flashover voltage shall not exceed 30 kV at the maximum. 3.7.3 Withstand voltage property 3.7.3.1 Test method According to the mounting torque specified in GB/T 6791, install the spark-plug, as shown in Figure 5, on the appropriate air chamber device. Compressed air of (4±0.2)MPa [(40±2)bar] is applied to the air chamber, to ensure that no discharge spark is generated between the electrodes during the test. At the connecting screw, LOAD a 50 Hz pulse peak voltage to the value specified in Table 4. The pulse voltage rise rate shall be greater than 600 V/μs. In order to avoid flashover creepage on the surface of insulator head, a high- pressure resistant rubber sheath may be used to insulate the insulator head from the air; and silicone grease shall be applied in the sheath. To avoid flashover at the ignition end or flashover creepage of insulator skirt surface, the side electrode can be removed (Example 1); or the end face of insulator skirt is covered by an insulated hose. The epoxy resin is filled in the hose and cured, to completely insulate the center electrode from the air (Example 2). ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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