QC/T 991-2015 (QC/T991-2015, QCT 991-2015, QCT991-2015)
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Passenger cars. Light alloy wheels. 90-degree impact test procedure
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QC/T 991-2015
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| Standard ID | QC/T 991-2015 (QC/T991-2015) | | Description (Translated English) | Passenger cars. Light alloy wheels. 90°impact test procedure | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Classification of Chinese Standard | T22 | | Classification of International Standard | 43.040.50 | | Word Count Estimation | 12,124 | | Date of Issue | 2015-04-30 | | Date of Implementation | 2015-10-01 | | Quoted Standard | GB/T 2933 | | Drafting Organization | Citic Card Co., Ltd. Dai; Zhejiang Wanfeng Auto Wheel Co., Ltd. | | Administrative Organization | National Automotive Standardization Technical Committee | | Regulation (derived from) | Ministry of Industry and Information Technology Announcement (2015 No. 28) | | Issuing agency(ies) | Ministry of Industry and Information Technology of the People's Republic of China | | Summary | This standard specifies the �� and �� two kinds of laboratory test methods, strength and safety performance when used to assess the impact of the wheels being perpendicular to the axis of the wheel. Two ways, one alternative test. This standard applies to passenger cars light alloy wheels. |
QC/T 991-2015
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 22
Passenger cars - Light alloy wheels -
90° impact test procedure
ISSUED ON. APRIL 30, 2015
IMPLEMENTED ON. OCTOBER 01, 2015
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Announcement of Ministry of Industry and Information Technology of the
People's Republic of China ... 3
Foreword ... 7
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 8
4 Test samples ... 8
5 Method I ... 8
6 Method II ... 13
Appendix A (Normative) Measurement method of rim deformation ... 17
Passenger cars - Light alloy wheels -
90° impact test procedure
1 Scope
This standard specifies two laboratory test methods, I and II, to assess the
strength and safety performance of the wheel when the wheel is subjected to
the impact perpendicular to the axis. It may select either of the two methods to
carry out test.
This standard applies to light alloy wheels of passenger cars.
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 2933 Wheels and rims for pneumatic tires - Vocabulary, designation
and marking, (GB/T 2933-2009, ISO 3911.2004 IDT)
3 Terms and definitions
The terms and definitions as defined in GB/T 2933 apply to this standard.
4 Test samples
The representative new wheel which has undergone all processing steps, is
equipped with tires, is applicable to the vehicles.
The wheels and tires used in this test are no longer available for use on vehicles.
5 Method I
5.1 Test equipment
Figure 1 shows a schematic diagram of a typical test equipment for Method I. It
consists mainly of a hammer that can move in the vertical direction and a wheel
& tire assembly mounting bracket. The main requirements are as follows.
a) Hammer. The angle of the impact surface is 150°, the radius of the fillet is
R2, the width is 195 mm, the length is 500 mm.
b) The basic weight of the hammer is 150 kg, the maximum weight is 315 kg,
the minimum adjustable weight is 5 kg;
c) All weights of the hammer can be fixed in one integral piece, the falling
time shall not exceed 2% of the theoretical free-fall time;
d) There shall be means to prevent secondary impact after the hammer is
rebounded;
e) The mounting bracket has two pivotable fulcrums which have a spacing of
200 mm;
f) Two disc-springs, the combined stiffness Cf = (85 ± 5) kN/mm, the pre-
compression amount of the disc spring is 0.2 mm;
g) The horizontal position of the bracket is inclined downward by 1°;
h) The wheel’s fixing device can adapt to the change of the wheel offset,
ensure that the distance between the center of the tire section and the left
fulcrum as shown in Figure 1 is 450 mm, meanwhile align the center line
of the hammer.
5.2 Test methods
5.2.3.1 Install the wheel & tire assembly on the test machine. Ensure that the
size of the fixing device of the wheel on the test machine is appropriate to that
of the fixing device which is used on the vehicle. Adjust the axial position of the
wheel, so that the centerline of the tire’s section is aligned with the centerline of
the hammerhead (see Figure 1), then lock the axial adjustment mechanism.
Adjust the position of the wheel in the circumferential direction, so that the
impacted portion is directly under the hammerhead.
For the two impact energies, E1 and E2, it may impact the same wheel. Each
impact corresponds to a different window. It is recommended to use E2 energy
to impact the valve window’s position, and make the interval between the two
impact positions as large as possible.
5.2.3.2 Manually tighten the nut or bolt to the specified torque value, or use the
methods as recommended by the vehicle or wheel manufacturer to tighten it. If
there is no torque requirement, it is recommended to use the torque of (110 ±
10) N • m.
5.2.3.3 In accordance with the calculated energy, refer to Table 1 to select and
adjust the hammer’s mass, calculate the falling height (gravity acceleration
value is 9.81 m/s2).
When the impact energy is less than 2000 J, the weight of the hammer is 150
kg; when the impact energy is above 2000 J, the mass of the hammer is
increased by the amplitude of 5 kg, and the impact velocity is kept in the range
of (5 ± 0.2) m/s. The impact energy is allowed to adjust within ± 2%.
with the lowest section height which is applicable for the wheels. The inflation
pressure is the value specified by the vehicle manufacturer and, if not specified,
it shall be (200 ± 10) kPa. The test ambient temperature shall be maintained
between 10 °C ~ 30 °C.
6.2.2 Calculation of hammer’s falling height.
Where.
H - The falling height of hammer, mm;
Fr - The maximum static load of the wheel as specified by the wheel or
vehicle manufacturer, kg.
K - Coefficient, mm/kg. There are usually two values. K1 = 0.05 and K2 =
0.28.
6.2.3 Test procedure.
6.2.3.1 Install the wheel & tire assembly on the test machine. Ensure that the
size of the fixing device of the wheel on the test machine is appropriate to that
of the fixing device which is used on the vehicle. Adjust the axial position of the
wheel, so that the centerline of the tire’s section is aligned with the edge of the
hammerhead’s impact surface (see Figure 2). Adjust the position of the wheel
in the circumferential direction, so that the impacted portion is directly under the
hammer.
For the two impact heights, H1 and H2, it may impact the same wheel. Each
impact corresponds to a different window. It is recommended to use DH2 height
to impact the valve window’s position, make the interval between the two impact
positions as large as possible.
6.2.3.2 Manually tighten the nut or bolt to the specified torque value, or use the
methods as recommended by the vehicle or wheel manufacturer to tighten it. If
there is no torque requirement, it is recommended to use the torque of (110 ±
10) N • m.
6.2.3.3 Adjust the distance from the impact surface to the highest point of the
tire, make it equal to the falling height H of the hammer.
6.2.3.4 Release the hammer to carry out impact.
6.2.3.5 Check the deformation or crack of the rim. The measurement method
of rim deformation is as shown in Appendix A.
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