QC/T 29061-2013 English PDF (QCT29061-2013)

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QC/T 29061-2013: Engineering specification for auto engine wax thermostat
QC/T 29061-2013
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060
T 10
Replacing QC/T 29061-1992
Engineering specification for
auto engine wax thermostat
ISSUED ON. APRIL 25, 2013
IMPLEMENTED ON. SEPTEMBER 01, 2013
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 ... 8
4 Technical requirements ... 11
5 Test equipment and instruments ... 13
6 Test methods ... 14
7 Inspection rules ... 22
8 Marking, packaging, transportation and storage ... 23
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is a revision of QC/T 29061-1992 “Engineering specification for
auto engine wax thermostat”. The main performance indicators and contents
are determined based on the actual process level of China combining with the
international standards.
The main changes in this standard compared to QC/T 29061-1992 are as
follows.
- ADD the following terms and definitions. max stroke, cleanliness, closing
jiggle valve pressure, air flow of jiggle valve, difference of pressure to open
valve;
- ADD the following main performance indicators. max stroke, cleanliness,
closing jiggle valve pressure, air flow of jiggle valve, difference of pressure
to open valve, vibration resistance, damage strength, salt spray resistance;
- MODIFY the definition of start to open temperature and sensitivity;
- MODIFY the performance indicators of start to open temperature, sensitivity,
leakage;
- MODIFY the performance indicators for high temperature resistance and
durability;
- ADD a list of testing items;
- ADD the operation diagram.
This standard was proposed and shall be under the jurisdiction of the National
Automotive Standardization Technical Committee (SAC/TC 114).
Drafting organizations of this standard. China First Automobile Group
Corporation Technology Center, Dongfeng Fuji Thomson Thermostat Co., Ltd.,
Qufu Tianbo Auto Parts Manufacturing Co., Ltd.
The main drafters of this standard. Wang Ji, Wang Yajuan, Wan Qingjiang, Li
Ganming, Kong Min.
Engineering specification for
auto engine wax thermostat
1 Scope
This standard specifies the technical requirements, test methods, inspection
rules and packaging, marking, transportation and storage requirements for auto
engine wax thermostat (hereinafter referred to as thermostat).
This standard applies to auto engine wax thermostat, the engine thermostat for
other applications may also make reference to it.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 3821 Small and medium power internal combustion engines -
Cleanliness limits and measurements
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Start to open temperature
During the temperature rise of the medium, the temperature of the medium
when the open stroke of the main valve of the thermostat reaches A (see
Table 1 and Figure 1).
Table 1 -- Main valve full open stroke at the start to open temperature
Main valve form Main valve open stroke A
Metal main valve 0.10 mm
Rubber main valve 0.35 mm
Unless otherwise specified, the hysteresis is not more than 2.5 °C. The
determination point is 50% of the minimum value of the full open stroke.
4.8 Opening sensitivity
The opening sensitivity is not more than 20 s unless otherwise specified.
4.9 Fully opened sensitivity
The fully opened sensitivity is no more than 90 s unless otherwise specified.
4.10 Cleanliness
The mass of the impurities is not more than 60 mg unless otherwise specified.
4.11 Closing jiggle valve pressure
The closing jiggle valve pressure is as specified in the drawings and technical
documents.
4.12 Air flow of jiggle valve
The air flow of jiggle valve is as specified in the drawings and technical
documents.
4.13 Difference of pressure to open valve
The difference of pressure to open valve is as specified in the drawings and
technical documents.
4.14 Low temperature resistance
The thermostat shall be able to withstand a low temperature test of (-40 ± 2) °C
for 24 h, the start to open temperature change before and after the test is not
more than 1 °C.
4.15 High temperature resistance
The thermostat shall be able to withstand the high temperature test of (135 ±
2) °C for 1 h. The start to open temperature change before and after the test is
not more than 2.5 °C, the full open stroke change rate is not more than 12%.
4.16 Durability
After 3.0×104 full opening and closing, the start to open temperature change
before and after the test is not more than 3 °C, the full open stroke change rate
is not more than 15%, the leakage after the test is increased by 12% within the
initial specification value.
4.17 Vibration resistance
The thermostat is oscillated by adding 30 g in each of the specified X-X and Y-
Y directions, at the vibration frequency of 300 Hz, to perform the vibration
resistance test, and the running time is 24 hours. Before and after the test, the
start to open temperature change is not more than 3 °C, the full open stroke
change rate is not more than 15%, the leakage change is not more than 12%
of the maximum value specified in the drawing.
4.18 Damage strength
The thermostat bracket and the valve seat disintegrate or the damage strength
is not less than 900 N.
4.19 Salt spray resistance
The thermostat is tested in accordance with the neutral salt spray test (NSS
test) as specified in GB/T 10125. The judgment criteria of the test results is
determined by both parties through negotiation.
5 Test equipment and instruments
5.1 Test equipment
- Constant temperature test chamber (the temperature inside the chamber
shall be above 135 °C);
- Salt spray test chamber;
- Low temperature test chamber (the temperature inside the chamber shall
be below -40 °C);
- Cleanliness test bench;
- Vibration test bench;
- Jiggle valve characteristic test bench;
- Strength test bench;
- Difference of pressure to open valve test bench.
5.2 Test equipment
- Mercury thermometer (accuracy 0.1 °C);
- Flow meter or measuring cup (accuracy 1%);
a) Product of trial production and first batch production.
b) Products that have undergone major changes in structure, materials, and
processes after formal production.
c) The production is discontinued for more than one year and then restored.
d) The product proposed by the customer for type inspection.
e) During normal production, a type inspection is carried out once a year,
where durability test is carried out once every two years.
8 Marking, packaging, transportation and storage
8.1 The thermostat shall be marked with the manufacturer's code or trademark,
model number, nominal temperature, date of manufacture, etc.
8.2 For the thermostat packaging, if the manufacturer has requirements, it shall
be in accordance with the requirements of the manufacturer; otherwise, it is
packaged by carton (box), in which the product certifi...