GB/T 31970-2015 English PDF (GB/T31970-2015)

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GB/T 31970-2015: Performance Requirements and Bench Test Methods for Air Brake Caliper Assemble of Automobile
GB/T 31970-2015
(Cars caliper assembly performance requirements and test methods of using air brake)
ICS 43.040.40
T24
National Standards of People's Republic of China
Automotive air brake caliper assembly and performance requirements
Bench Test Method
Issued on. 2015-09-11
2016-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard by the National Automotive Standardization Technical Committee (SAC/TC114) centralized.
This standard was drafted. China Automotive Engineering Research Institute Co., Ltd., China Automotive Technology and Research Center, Wuhan Yuanfeng Auto Parts Co., Ltd., Zhejiang VIE Science and Technology Co., Ltd., WABCO Vehicle Control Systems (China) Co., Ltd., Long the Group Holdings Limited.
The main drafters of this standard. Meizong Xin, Europe Jiafu, Liu, a source Tong Xing, Yu Di Hui, Chen Xiaolei, love Hou, Jiang Jiyun.
Automotive air brake caliper assembly and performance requirements
Bench Test Method
1 Scope
This standard specifies the automotive air brake caliper assembly performance requirements and test methods of.
This standard applies to the working medium is compressed air brake caliper assembly (does not include brake chamber).
2 Normative references
The following documents for the application of this document is essential. For cited documents with dates, only the dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 5620-2002 Road vehicles and trailer brake Terminology and definitions GB/T 10125-1997 Corrosion tests in artificial atmospheres - salt spray test
QC/T 316 auto service brake dynamometer test method for fatigue strength
3 Terms and Definitions
GB/T 5620-2002 define the following terms and definitions apply to this document.
3.1
Starting pressure
The air pressure in the brake caliper assembly pad assembly began brake chamber input pressure when moving.
3.2
Dragging torque
After releasing the brake pressure, the residual brake disc rotational resistance torque.
4 Performance Requirements
4.1 Starting pressure
Pneumatic brake caliper assembly starting pressure should not exceed 40kPa.
4.2 clamp body rigidity
Rated working pressure, total deformation sample clamp body along the center line of the plunger should meet the design requirements.
4.3 clamp sliding resistance
Caliper sliding resistance should not exceed 90N.
4.4 brake clearance self-adjustment function
The sum of the gap pad and brake disc assembly between the brake adjustment after 20 should meet the design requirements.
4.5 Dragging torque
Brake disk in lap 10 during the rotation of the torque shall not exceed the maximum dragging 8N · m.
4.6 waterproof
After soaking the sample clamp body cavity there should be no water droplets exist. Floating clamp brake caliper slide pins at floating clamp should be no water stains out.
4.7 torsional fatigue
During the test, samples should be no catching phenomenon. Following the test, the performance indicators should meet the following requirements.
a) sample clamp body should be no obvious surface cracks and affect the function of the deformation;
b) wear pad assembly part should be uniform, no obvious punch and no peeling;
c) brake disc wear should be uniform, no obvious punch;
d) the clamp body sliding resistance should not exceed 100N;
e) self-adjusting brake clearance functions shall meet the requirements of 4.4.
4.8 Temperature Durability
Temperature durability test, the sample should be no catching phenomenon. Following the test, the performance indicators should meet the following requirements.
a) sample clamp body, exposed non-metallic parts should be no significant deformation and affect the function of surface cracks;
b) starting pressure should not exceed 45kPa;
c) clamp sliding resistance should not exceed 100N;
d) self-adjusting brake clearance functions shall meet the requirements of 4.4.
4.9 salt spray corrosion
Air brake caliper assembly after 72h salt spray corrosion test, the outer surface of any kind within the range of 100cm2 should not have a diameter larger than 2mm of corrosion, corrosion of the total area should not exceed 5cm2; starting pressure sample should not exceed 45kPa, clamp body sliding resistance should not exceed 100N.
5 Test requirements
5.1 Test equipment requirements
5.1.1 Dragging torque test rig
Test stand installing brake disc spindle speed can be adjusted in the range of 0 ~ 50r/min, the system detects the error should not exceed the moment of full scale ± 1.0%, resolution is not less than 0.1N · m.
5.1.2 high and low temperature test chamber
Error chamber of the actual temperature and the set temperature should not exceed ± 2 ℃, the chamber should be connected to the pipe passage and having insulation, wet sealing measures, the test chamber shall be installed sample and test fixture space .
5.1.3 salt spray chamber
Salt spray chamber should meet the requirements in the neutral salt spray test 10125-1997 GB/T .
5.2 sample requirements
5.2.1 The samples shall be specified by the technical documents according to procedures approved by the manufacture.
5.2.2 The outer surface of the sample should be clean, no rust, burrs, cracks and other defects.
5.2.3 Test sequence and test the portfolio should be according to Table 1.
Table 1 Test sequence and test portfolio
Test sequence Test Project Name
Sample number and the pilot project to be carried out
Note. "*" indicates the pilot project to be carried out; "-" indicates the pilot project is not carried out.
6 Test methods
6.1 Starting pressure
6.1.1 Air brake caliper assembly simulation of the actual vehicle state (brake chamber shall be equipped with a real car brake chamber) is mounted on a test stand, see Figure 1.
Explanation.
1,8 --- dial indicator or displacement sensor;
2 --- outer pad assembly;
3 --- lined block assembly;
4 --- clearance self-leveling mechanism;
5 --- brake chamber;
6 --- gauges or pressure sensors;
7 --- shut-off valve;
. 9 --- regulator;
10 --- gas source;
. 11 --- clamp body;
12 --- brake disc;
13 --- brake disc holder;
14 --- clamp body bracket.
Figure 1 a schematic view of the clamp body rigidity measurement
6.1.2 to five times the rated working pressure of the brake pressure holding time should not be less than 5s, interval time between brake is 2s ~ 3s.
6.1.3 brake chamber inlet pass into the air, the pressure was slowly raised from scratch, the system records the beginning of the pad assembly when moving
Angry chamber pressure input value.
6.2 clamp body rigidity
6.2.1 Air brake caliper assembly horizontally mounted on a test stand, see Figure 1.
6.2.2 clamp body deformation measurement points should be selected in the sample outer surface of the flat portions, avoiding uneven surface of the sample, should be in the clamp body
Putting the center line near the outer ends of the sample. If the center line of the plunger can not be measured, optionally with the center line parallel to the push rod
Other representative on location.
6.2.3 Subject to 6.2.2 requires mounting point by installing dial indicator or micro displacement sensor for measuring sample clamp body putter center axis
The total amount of the deformation.
6.2.4 to five times the rated working pressure of the brake pressure holding time should not be less than 5s, interval time between brake is 2s ~ 3s.
6.2.5 In the brake chamber through the inlet port into the air, the pressure was slowly raised to scratch the rated working pressure, keeping 5s, like record
Deformation of the total iron body member in the direction of the center line of putt.
Note. For two or more samples putt putter, which can measure the total amount of deformation of the center line of the plunger in different directions, whichever is the highest value as the sample pushing the clamp body
Total deformation centreline direction.
6.3 clamp sliding resistance
6.3.1 Air brake caliper assembly horizontally mounted on a test stand, see Figure 1. Eliminate the effects of gravity on the measurement of the brake disc to die
Quasi brake disc (ie, the thickness of the brake disc the same plate).
6.3.2 to 10 times the rated working pressure of the brake. Every time when the brake pressure holding time of not less than 5s, two braking interval
Between the 2s ~ 3s.
6.3.3 After the last brake release, remove the brake disc simulation, so that the floating clamp body portion to move in both directions along the center line of the putt, measured
So that the amount of iron body began to float force value when moving in both directions along a portion of the center line of putt, whichever is the highest value as the clamp body sliding resistance.
NOTE. For fixed calipers brake caliper assembly pressure, not to carry out the project.
6.4 brake clearance self-adjustment function
6.4.1 Air brake caliper assembly simulation of the actual vehicle state (brake chamber shall be equipped with a real car brake chamber) is mounted on a test stand, see
figure 1.
6.4.2 analog discs Ⅰ (the actual vehicle brake disc is quite rigid, the same thickness, and should not affect the normal contact between the pad cartridge)
Instead of the brake disc.
6.4.3 to 20 times the rated working pressure brake pressure holding time should not be less than 5s, interval time between brake is 2s ~ 3s.
6.4.4 After the last brake release, the sum of the measurement gap simulated brake disc and pad assembly between.
6.4.5 change among other members of the same material, the thickness of the brake discs smaller than analog Ⅰ 1.3mm ~ 1.5mm analog discs Ⅱ, sample
Positional relationship, dimensions remain unchanged.
6.4.6 Repeat 6.4.3 and 6.4.4.
6.5 Dragging torque
6.5.1 lint-free cloth slightly dampened with acetone, wiping the brake disc and pad assembly friction surface.
6.5.2 The pressure in the brake caliper assembly installed dragging torque test rig, see Figure 2.
Explanation.
1 --- Motor;
2 --- motor bracket;
3 --- coupling;
4,6 --- intermediate support;
5 --- torque sensor;
7 --- brake disc coupling flange;
8 --- clamp body;
. 9 --- outer pad assembly;
10 --- lined block assembly;
--- Gap. 11 self-leveling mechanism;
12 --- brake chamber;
13 --- gauge or pressure sensor;
14 --- valve;
15 --- regulator;
16 --- gas source;
17 --- scaffold;
18 --- clamp body flange connection;
19 --- brake disc.
Figure 2 a schematic view of dragging torque measurement
6.5.3 The sum of the gap pad assembly sample return, so that the pad assembly and brake disc friction surface is 0.80mm ~ 1.50mm.
6.5.4 the brake disc to 45r/min ± 2r/min idle 3min, the measurement readings dragging torque to zero torque sensor, brake disc
Stop turning.
6.5.5 to 20 times the rated working pressure brake pressure holding time should not be less than 5s, interval time between brake is 2s ~ 3s.
6.5.6 After the last brake release 2min, brake discs reach 45r/min ± 2r/min rotational speed in the 10s and kept the revolution
Speed rotation, brake disc measuring at 10 revolutions in the process of dragging the maximum torque.
6.6 waterproof
6.6.1 The sample placed in the tank, the axis should be located above the clamp body, disc brake caliper body in a horizontal position, the brake chamber (can also be molded
Quasi brake disc) placed between two samples of the pad assembly.
6.6.2 water tank to make up the brake chamber and clamp mounting surface, but below the brake chamber vent.
6.6.3 to 20 times the rated working pressure brake pressure holding time should not be less than 5s, interval time between brake is 2s ~ 3s.
6.6.4 After the last brake release, the sample was removed from the tank, wipe clean the stains sample surface.
6.6.5 The brake chamber on the sample removed, check whether the sample clamp body cavity drops; floating brake caliper clamp should be pushed back and forth sample
Floating caliper, floating caliper slide pin observed at whether the support bearings from water damage inside out.
6.7 torsional fatigue
Press QC/T 316 were 1 × 105 times the fatigue strength test. During the test sample was observed without obvious catching phenomenon; end of the trial
After checking sample deformation clamp body for visible signs of surface cracks and affect the function of the check sample pad assembly worn part is uniform, with or without
Obviously punch, with or without peeling, check the sample brake disc wear part is uniform, without obvious punch; retest sample clamp sliding resistance
Force, brake clearance self-adjustment function.
For the three-axis (including triaxial) above multiaxial cars, participants pneumatic brake caliper assembly braking torque according to equation (1).
Md --- subjects pneumatic brake caliper assembly brake torque, the unit is Nm (N · m);
To simulate a --- braking deceleration in meters per second squared (m/s2);
Ga --- car loaded on the total mass, in kilograms (kg);
β --- subjects pressure ratio of braking force and the vehicle braking force of the caliper assembly where the axle braking;
r --- wheel dynamic rolling radius in meters (m);
n --- axle number;
m --- pneumatic brake calipers subjects where the number of brake axle assembly.
6.8 Temperature Durability
6.8.1 Table 2 test sequence and requirements.
Table 2 Temperature Durability Test
Pilot projects and test sequence ambient temperature
6.8.2 endurance test conducted at room temperature, the sample is mounted, see Figure 3; 160 per brake, brake pad gap along the direction of the wear assembly
Increased 0.05mm; each brake 64,000 times, adjust sample one-way clutch adjustment mechanism (rotation number of laps), push the brake plate back to the original
Initial state.