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QC/T 1033-2016

Chinese Standard: 'QC/T 1033-2016'
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BASIC DATA
Standard ID QC/T 1033-2016 (QC/T1033-2016)
Description (Translated English) (Technical requirements and test methods of external pneumatic brake clearance automatic adjustment)
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T24
Word Count Estimation 13,181
Date of Issue 2016-04-05
Date of Implementation 2016-09-01
Regulation (derived from) Ministry of Industry and Notice No. 17 of 2016
Summary This standard specifies the terms and definitions, technical requirements, test related requirements and bench test methods for external clearance automatic adjustment devices for pneumatic drum brakes for automobiles and trailers.

QC/T 1033-2016
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
T 24
Air brake - Performance requirements and bench test
methods of external automatic brake adjuster
气压制动器 外置式间隙自动调节装置技术要求及台架试验方法
ISSUED ON. APRIL 05, 2016
IMPLEMENTED ON. SEPTEMBER 01, 2016
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
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Table of Contents
Foreword ... 8 
1 Scope ... 9 
2 Normative references ... 9 
3 Terms and definitions ... 9 
4 Technical requirements ... 10 
5 Test related requirements ... 11 
6 Test methods ... 12 
Air brake - Performance requirements and bench test
methods of external automatic brake adjuster
1 Scope
This Standard specifies the terms and definitions, technical requirements, test
related requirements and bench test methods for external automatic brake
adjuster of car and trailer air drum brakes.
This Standard is applicable to external automatic brake adjuster of car and
trailer air drum brakes (hereinafter referred to as “automatic brake adjuster”).
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 175, General purpose Portland cement
GB/T 5620, Road vehicles - Braking of automotive vehicles and their trailers
- Vocabulary
QC/T 32-2006, Test methods of air cleaners for automobiles
3 Terms and definitions
The terms and definitions defined in GB/T 5620 as well as the followings apply
to this Standard.
3.1 rate torque, Te
the maximum working torque value of the worm gear rotating by the brake
chamber pushing rod under the rated working pressure and the rated working
pressure
NOTE. The unit of rated torque is N•m.
150 mm arm length), and zeroing the measuring device. Then apply the same
test torque in the opposite direction to 6.2.2, while recording the displacement
of the displacement measuring device.
6.2.4 Rotate the worm shaft to turn the worm gear 72°±3°, then repeat at this
position 6.2.2 and 6.2.3.
6.2.5 Repeat 6.2.4 for a total of 3 times.
6.3 High-low temperature test
6.3.1 Immerse the automatic brake adjuster in a closed tank and apply a
constant pressure of (21±5) kPa inside the tank.
6.3.2 Remove the automatic brake adjuster from the water after 24h (do not
dry). Immediately install it on the test fixture as follows.
a) install and adjust the automatic brake adjuster according to the product
technical documentation requirements;
b) when the automatic brake adjuster is in the brake release state, the
residual torque it receives shall be (22.5 ±11.5) N•m;
c) when the torque applied by the automatic brake adjuster is 200 N•m, the
brake chamber push rod stroke shall be greater than the upper limit of the
maximum brake interval of the automatic brake adjuster.
6.3.3 Place the automatic brake adjuster and test fixture at least for 16 h in an
environmental chamber at an ambient temperature of (-40±2)°C.
6.3.4 At the end of the installation, the automatic brake adjuster is still subjected
to 3 braking tests with a test torque of 200 N•m under this ambient temperature
condition. Observe and record the operation of the automatic brake adjuster
and the brake chamber push rod stroke for each brake.
6.3.5 Adjust the automatic brake adjuster to the initial state before the low
temperature test. The sample and test fixture are then allowed to stand for at
least 16h in an environmental chamber at an ambient temperature of (80±3)°C.
6.3.6 At the end of the placement, the automatic brake adjuster is still subjected
to 100 braking tests with a test torque of 200 N•m under this ambient
temperature condition. Observe and record the operation of the automatic
brake adjuster and the stroke of the air chamber pusher during each braking.
6.4 Corrosion resistance
6.4.1 Install the automatic brake adjuster on the test fixture in the salt bath
according to the technical documentation requirements of the product.
6.5.7 After the test, adjust the torque according to 6.1.
6.6 Dust test
6.6.1 The automatic brake adjuster sample is mounted on the test fixture in the
dust chamber with a cavity size of approximately 900mm × 900mm × 900mm
as required by the product technical documentation. The distance between the
surface of the sample and the chamber shall not be less than 150mm.
6.6.2 Perform 100 brake tests at a test torque of 0.2Te or until the chamber push
stroke is stable.
6.6.3 Perform braking at a test torque of 0.2Te, and the displacement at the arm
length of 150 mm shall be recorded as the initial stroke.
6.6.4 Spread 4.5 kg of cement in accordance with GB 175 evenly on the bottom
of the box.
6.6.5 Carry out 5000 brake tests according to the test torque of 0.2Te, and the
working time of each brake shall be the same as 6.4.8.
6.6.6 During the test, in order to simulate the brake lining wear, the brake gap
shall be increased every 160 times of brake tests are performed, so that the
angle of the automatic brake adjuster is increased by 0.5°.
6.6.7 During the test, the cement is stirred once with compressed air or blower
every 15 minutes. Each stirring time is 2s, and the cement dust shall be filled
into the d......
Related standard:   QC/T 1028-2016  QC/T 1095-2018
Related PDF sample:   QC/T 1028-2016
   
 
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