GB/T 32691-2016 PDF English
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Automobile A/C electromagnetic clutch
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GB/T 32691-2016: Automobile A/C electromagnetic clutch---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/GBT32691-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
Automobile A/C electromagnetic clutch
ISSUED ON: JUNE 14, 2016
IMPLEMENTED ON: JANUARY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Requirements ... 6
5 Test methods ... 11
6 Inspection rules ... 19
7 Marks, packaging, transport and storage ... 24
Automobile A/C electromagnetic clutch
1 Scope
This Standard specifies terms and definitions, requirements, test methods,
inspection rules and marks, packaging, transport and storage of automobile A/C
electromagnetic clutch (hereinafter referred to as the clutch).
This Standard is applicable to the electromagnetic clutch used for automobile
air conditioning compressor.
2 Normative references
The 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 2423.17, Environmental testing for electric and electronic products -
Part 2: Test method - Test Ka: Salt mist
GB/T 2828.1, Sampling procedures for inspection by attributes – Part 1:
Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot
inspection
GB/T 9286, Paints and varnishes - Cross cut test for films
GB/T 18655-2010, Vehicles boats and internal combustion engines - Radio
disturbance characteristics - Limits and methods of measurement for the
protection of on-board receivers
GB/T 21360-2008, Refrigerant compressor for motor vehicle air condition
GB/T 21437.2-2008, Road vehicles - Electrical disturbances from conduction
and coupling - Part 2: Electrical transient conduction along supply lines only
GB/T 28046.2-2011, Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 2: Electrical loads
GB/T 30038-2013, Road Vehicles - Degrees of Protection (IP-Code) -
Protection of Electrical Equipment Against Foreign Objects, Water and
Access
Product of the mass (g) of the components due to manufacturing accuracy and
the centroid distance from center of mass (mm) (applicable to pulley assembly,
drive disc assembly).
3.4 pull-in voltage
Minimum voltage to eliminate maximum air gap in static state.
3.5 initial static friction torque
Before the clutch is used, the maximum friction torque of the drive disc and the
pulley slips relative to each other within 90° after suction.
3.6 static friction torque after running-in
After running-in of the clutch, the maximum friction torque within 90° of relative
slippage between the drive disc and the pulley is combined.
3.7 pull-in noise
After the clutch is energized, the sound produced by the drive disc and the
pulley when they are engaged.
3.8 separation noise
After the clutch is powered off, the sound produced when the drive disc is
separated from the pulley.
3.9 disconnection period
Time required from when the clutch is de-energized until the working surface of
the drive disc completely disengages from the working surface of the pulley.
3.10 connection period
Time required from when the clutch is energized to when the drive disc is moved
to synchronize with the pulley.
4 Requirements
4.1 Product drawings and technical documents
The clutch shall be manufactured in accordance with the drawings and
technical documents approved by the prescribed procedures.
4.2 Appearance and assembly requirements
4.2.1 The shape and installation dimensions of the clutch shall meet the
5mA.
4.15 Coil temperature rise
The temperature rise of the coil in the clutch should not be greater than 105°C.
4.16 Pull-in noise
4.16.1 The noise (sound pressure level) generated by the reed-connected
drive-type clutch when it is energized and pulled-in shall not be greater than
100dB(A) (Nc is 1800r/min).
4.16.2 The noise (sound pressure level) generated by the rubber-connected
drive-type clutch when it is energized and pulled-in shall not be greater than
80dB(A) (Nc is 1800r/min).
4.17 Separation noise
After the clutch is powered off, there is no trailing noise when the drive disc and
the pulley are separated.
4.18 Electromagnetic compatibility
4.18.1 Conducted disturbance limits - Voltage method
Conduct the conducted disturbance test to the clutch. The limits shall not
exceed the requirements of Level 3 in Table 5 and Table 6 of 6.2.3 in GB/T
18655-2010.
4.18.2 Radiation disturbance limit - ALSE method
Conduct the radiation disturbance test to the clutch. The limits shall not exceed
the requirements of Level 3 in Table 9 and Table 10 of 6.4.4 in GB/T 18655-
2010.
4.18.3 Electrical transient immunity along power lines
The clutch conduction immunity test adopts specific pulse type, severity level
and test conformity determination agreed by the supplier and the purchaser
through negotiation.
4.19 Water resistance
The clutch shall meet the requirements of 4.4, 4.8, 4.11, 4.13, 4.14 after the
water resistance test.
4.20 Water protection performance
The coil assembly in the clutch (excluding the connector part) shall be tested
5.9 Test of static friction torque after running-in
Test the torque of the clutch assembly after running-in under the following
conditions. The test methods are same with 5.8:
- Rotation speed: (4500 ± 200) r/min;
- Compressor suction pressure / exhaust pressure: 0.2MPa/1.4MPa;
- On/off cycle time (ON/OFF): 5s/5s;
- Number of cycles: not less than 100 times.
5.10 Air gap test
When the clutch is installed correctly, use a thickness gauge to measure the air
gap.
5.11 Pull-in voltage test
When the clutch is installed as normal, take the maximum value for air gap
according to Table 3. Power it on. The voltage is boosted at a speed of 0.5V/s
from 0V. Use DC regulated power supply to regulate voltage. Use a voltmeter
to measure and record the voltage value when the air gap is eliminated.
Disconnect the power. Rotate the pulley 120° and measure again according to
the above process. Measure 3 times in total. Calculate the average of 3
voltages.
5.12 Static imbalance test
Use a static balance measuring machine to test the imbalance amount of pulley
assembly and drive disc assembly.
5.13 Insulation resistance test
Use a megohmmeter to apply 500V DC between the coil case and the
conductor. Measure the insulation resistance value.
5.14 Withstand voltage test
The withstand voltage test of the clutch is carried out in accordance with 4.11.2
in GB/T 28046.2-2011.
5.15 Coil temperature rise test
Fix the coil on the compressor front cover. Put the coil without a fuse in a
120°C±2°C constant temperature box (put the coil with a fuse at 90°C±2°C).
Measure the coil resistance R0 after the temperature stabilizes. And then apply
the test voltage to the coil. The duration is not less than 2h. Measure the current
Table 3 for the air gap. Operate according to the test conditions in Table 8.
Under the condition that the ambient noise is not greater than 60dB(A),
disconnect power after applying test voltage to the clutch and distinguish audio
with human ears.
5.18 Electromagnetic compatibility test
5.18.1 Conducted emission - Voltage method test
Test the coil assembly in the clutch in accordance with 6.2 of GB/T 18655-2010.
5.18.2 Radiated emission - ALSE test
Test the clutch according to the method specified in 6.4 of GB/T 18655-2010.
5.18.3 Electrical transient conducted immunity test along power lines
Test the coil assembly in the clutch in accordance with Clause 5 of GB/T
21437.2-2008.
5.19 Water resistance test
Immerse the clutch assembly in normal temperature water for 24h. The
immersion depth is 100mm. Then remove and blow dry. Test in accordance with
5.4, 5.8, 5.11, 5.13, 5.14.
5.20 Water protection performance test
Test according to Figure 9 in GB/T 30038-2013 and level 9K in Table 7.
5.21 Temperature resistance performance test
5.21.1 Low-temperature resistance storage performance test
The clutch is in a normal installation state, without power on. Maintain 24h at -
40°C.
5.21.2 High-temperature resistance performance test
5.21.2.1 High-temperature resistance storage performance test
The clutch is in a normal installation state, without power on. Maintain 48h at
150°C.
5.21.2.2 High-temperature resistance operation performance test
The clutch is in a normal installation state. Access to 12V or 24V power supply
in forced air circulation environment. Maintain 96h at 120°C.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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