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QC/T 777-2017

Chinese Standard: 'QC/T 777-2017'
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BASIC DATA
Standard ID QC/T 777-2017 (QC/T777-2017)
Description (Translated English) The technical conditions of electromagnetic fan clutch for automobile
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Word Count Estimation 18,118
Date of Issue 2017-04-12
Date of Implementation 2017-10-01
Older Standard (superseded by this standard) QC/T 777-2007
Drafting Organization Longkou Zhongyu Automobile Fan Clutch Co., Ltd.
Regulation (derived from) Ministry of Industry and Information Technology Bulletin 2017 No.14
Summary This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of electromagnetic fan clutches for automobiles.

QC/T 777-2017
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.30
T 14
Replacing QC/T 777-2007
The Technical Conditions of Electromagnetic Fan
Clutch for Automobile
汽车电磁风扇离合器技术条件
ISSUED ON: APRIL 12, 2017
IMPLEMENTED ON: OCTOBER 01, 2017
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 7
1 Scope ... 8
2 Normative References ... 8
3 Terms and Definitions ... 9
4 Classification of Electromagnetic Fan Clutch ... 11
5 Technical Requirements ... 11
6 Test Methods ... 16
7 Inspection Rules ... 23
8 Marking, Packaging, Transportation and Storage ... 25
The Technical Conditions of Electromagnetic Fan
Clutch for Automobile
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules,
markings, packaging, transportation and storage of electromagnetic fan clutch for
automobile (hereinafter referred to as electromagnetic clutch).
This Standard is applicable to electromagnetic clutch for automobile, which is mainly
used in engine cooling system of automobile; electromagnetic clutch used with other
internal combustion engines can be referred to.
2 Normative References
The following documents are essential to the application of this Standard. For the dated
documents, only the versions with the dates indicated are applicable to this Standard;
for the undated documents, only the latest version (including all the amendments) are
applicable to this Standard.
GB/T 191 Packaging – Pictorial Marking for Handling of Goods
GB/T 2423.37 Environmental Testing for Electric and Electronic Products - Part 2:
Test Methods - Test L: Dust and Sand
GB/T 2423.38 Environmental Testing for Electric and Electronic Products - Part 2:
Test Methods – Test R: Water Test Methods and Guidelines
GB/T 2828.1 Sampling Procedures for Inspection by Attribute – Part 1: Sampling
Schemes Indexed by Acceptance Quality Limit (AQL) For Lot-by-Lot Inspection
GB/T 12679 Motor Vehicles – Durability Running – Test Method
GB/T 13306 Plate
GB/T 13384 General Specifications for Packing of Mechanical and Electrical
Product
GB/T 17619 Limits and Methods of Testing for Immunity of Electrical / Electronic
Sub-Assemblies in Vehicles to Electromagnetic Radiation
GB/T 18655 Vehicles Boats and Internal Combustion Engines - Radio Disturbance
Characteristics - Limits and Methods of Measurement for the Protection of on-
Board Receivers
GB/T 4942.1 Degrees of Protection Provided by the Integral Design of Rotating
Electrical Machined (IP Code)-Classification
GB/T 4942.2 Low Voltage Electrical Enclosure Protection Class
JB/T 4159 General Technical Requirements of Electric Products for Tropical
Environment
QC/T 238 Storage and Preservation for Automotive Parts
QC/T 29106 Technical Specification of Low-Voltage Electric Harness for Motor
Vehicles
QC/T 413 Basic Technical Requirements for Automotive Electric Equipment
QC/T 625-2013 Metallic Coatings and Conversion Coatings for Automobiles
3 Terms and Definitions
For the purpose of this Standard, the following terms and definitions apply.
3.1 Engaged temperature
The temperature of the cooling medium when controlling the combination of
electromagnetic clutch driving disc with the driven disc.
3.2 Disengaged temperature
The temperature of the cooling medium when controlling the separation of the
electromagnetic clutch driving disc from the driven disc.
3.3 Engaged state
At the engaged temperature, the combined state of the electromagnetic clutch driving
disc with the driven disc.
3.4 Disengaged state
At the disengaged temperature, the separated state of the electromagnetic clutch
driving disk from the driven disk.
3.5 Engaged gap
The distance between the driving disk and the driven disk when the electromagnetic
3.15 Disengaged voltage
When the circuit is on, the voltage when the electromagnetic clutch driving disc
disengages from the driven disc.
3.16 Single stage electromagnetic clutch
The electromagnetic clutch, by turning on/off a winding circuit, that combines or
separates the driving disc and the driven disc.
3.17 Multistage electromagnetic clutch
The electromagnetic clutch, control multiple sets of winding circuits on/off in order, that
realizes the multiple working states of the driving disc and driven disc, such as from
follow operation, non-synchronized operation to synchronized operation or stepwise
separation from the driving disc.
4 Classification of Electromagnetic Fan Clutch
4.1 It can be divided into two types of with and without brush according to the structure.
4.2 It can be divided into two types of single stage and multistage according to the
work shift.
4.3 It can be divided into two voltage specifications of 12V and 24V according to the
rated voltage.
5 Technical Requirements
5.1 General requirements
5.1.1 The product shall be manufactured according to the product drawings and
technical documents approved by the prescribed procedures, and shall conform to the
provisions of this Standard.
5.1.2 The product drawings and technical documents of the electromagnetic clutch
shall specify: product model, rated voltage, initial static friction torque, performance
parameters of electrical components, rotation direction and tightening torque of
mechanical fasteners, etc.
5.1.3 The product is not allowed to have defects that affect the performance. The parts
of the electromagnetic clutch are not allowed to have defects such as burrs, damage,
rust, cracks, etc.
1min without breakdown.
5.2.9 Insulation heat resistance.
The insulation heat resistance of the electrical components of the electromagnetic
clutch must be no lower than Class F; and the temperature rise of the winding coil shall
be no greater than 65 °C.
5.2.10 Electromagnetic radiation immunity.
The electromagnetic radiation immunity of the electrical components of the
electromagnetic clutch shall conform to the relevant provisions of GB/T 17619.
5.2.11 Electromagnetic disturbance.
The electromagnetic disturbance of the electrical components of the electromagnetic
clutch shall conform to the relevant provisions of GB 18655.
5.2.12 Vibration resistance.
The electromagnetic clutch assembly shall be able to withstand the sweep frequency
vibration test in the three directions of X, Y, and Z; and the test time in each direction
is 8h. After the vibration test, the parts are not damaged or deformed, the fasteners are
not loose, and the electrical contacts and conductor insulation are intact. Their
performance shall conform to the provisions of 5.2.2 and 5.2.4.
5.2.13 Temperature resistance.
After the temperature resistance test of the electromagnetic clutch is completed, the
torque shall conform to the relevant provisions of 5.2.2.
5.2.14 Overspeed performance.
After testing in accordance with the method specified in 6.14, the parts shall be free of
damage and deformation; the performance shall conform to the provisions of 5.1.2 and
5.1.3.
5.2.15 Surface protection performance.
5.2.15.1 The exposed part of the electromagnetic clutch (except the friction parts)
made of ferrous metal shall be coated with anti-corrosion protective layer according to
QC/T 625-2013.
5.2.15.2 The appearance of the coated and chemically treated parts shall be no lower
than the Class-2 requirements of the grading method for the appearance quality of
electroplated and chemically treated parts specified in 2.4.1 of JB/T 4159.
6.2.2 Static friction torque after pull-in.
After the electromagnetic clutch pull-in, it indicates the static friction torque value after
reaching the maximum torque value and keep stable.
6.3 Detection of impact of operating voltage fluctuation on speed
The electromagnetic clutch assembly is installed on the platform and drives the fan to
run. The voltage fluctuation in the winding is adjusted to be within the specified range.
For the single stage electromagnetic clutch, separately measure the speed of driving
disc and fan. For the multistage electromagnetic clutch, separately measure the speed
of driving disc and driven disc and fan.
6.4 Detection of engaged gap
Use the gauge to measure the engaged gap between the driving disc and the driven
disc of the electromagnetic clutch. During the measurement, the driven disc shall be
rotated for 3 times so that it is at 3 different positions from the driving disc; and take
the average value of the 3 results.
6.5 Speed characteristics test
6.5.1 Install the electromagnetic clutch on the performance test bench; and complete
the speed characteristics test according to the provisions in the product drawings and
technical requirements.
6.5.2 Accuracy level of DC power supply for test: Level-1.0, output impedance shall be
no greater than 0.001Ω.
6.6 Engaged voltage test
6.6.1 The power supply voltage is set at 81.7% of the rated voltage; and test the
engaged state of the electromagnetic clutch.
6.6.2 The power supply voltage is set at 81.7% of the rated voltage; and test the
engaged state of the electromagnetic clutch after the thermal equilibrium is reached.
6.6.3 Adjust the engaged gap of the electromagnetic clutch to increase by 50% from
the upper limit; and set the power supply voltage to 95% of the rated voltage; and test
its engaged state.
6.7 Disengaged voltage test
Keep the engaged state for 15min at the rated voltage, decrease the voltage to the
voltage specified in the technical drawings; and test the separation state of the driving
disc and the driven disc.
The user shall perform the sampling inspection of the electromagnetic clutches in
accordance with double sampling plan and inspection level II specified in GB/T 2828.1;
and may also be resolved through consultation between the supplier and the purchaser.
7.3 Type inspection and determination rules
7.3.1 When the electromagnetic clutch has any of the following conditions, the
manufacturer shall perform type inspection:
a) When finalizing and identifying the new product;
b) When there are major changes in the design, process and materials of the
products after production, which affect the performance of the products;
c) Batch, mass-produced products no less than once every two years;
d) When production is resumed production after suspending for more than one year;
e) Whe......
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