GB/T 34586-2017 PDF in English
GB/T 34586-2017 (GB/T34586-2017, GBT 34586-2017, GBT34586-2017)
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GB/T 34586-2017 | English | 210 |
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Road vehicles -- Spark-plugs for gas engines -- Test methods and requirements
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Standards related to (historical): GB/T 34586-2017
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GB/T 34586-2017: PDF in English (GBT 34586-2017) GB/T 34586-2017
GB
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 Contents
Foreword ... 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 requirements
1 Scope
This 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 references
The 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 dimensions
3 Test methods and requirements
3.1 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 PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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