Some standard content:
ICS 65.060.10;43.160
B90;T54
Machinery Industry Standard of the People's Republic of China
JB/T10196.1-2000
Agricultural Transport Vehicle
Service Brake
AgriculturalvehicleBrake
Published on 2000-07-19
National Bureau of Machinery Industry
Implementation on 2000-08-01Www.bzxZ.net
JB/T10196.1—2000
According to the characteristics of three-wheel and four-wheel agricultural transport vehicles, this standard specifies the performance requirements and test methods of service brakes. Appendix A of this standard is a suggestive appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Agricultural Transport Vehicles. The drafting units of this standard are: Chongqing Automobile Research Institute, Henan Automobile Brake Factory, Zhejiang Asia-Pacific Electromechanical Group Corporation. The main drafters of this standard are: Chen Hui, Zhang Huaming, Zhou Changlu, Huang Guoxing. 1 Scope
Machinery Industry Standard of the People's Republic of China
Agricultural transport vehicle
Service brake
Agriculturalvdhicle—Brake
JB/T101%.1-2000
This standard specifies the definition, structural dimensions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of the service brake assembly of agricultural transport vehicles (hereinafter referred to as brakes). This standard applies to the service brakes of agricultural transport vehicles. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB 5673—1998
JB/T5673—1991
QC/T 77—1993
QC/T 2391997
QC/T 4791999
QC/T556—1999
3 Definitions
Brake linings for automobiles
Painting of agricultural and forestry tractors and implements
General technical conditions
Technical conditions for hydraulic wheel cylinders for automobiles
Performance requirements for truck and bus brakes
Test bench methods for truck and bus brakes Temperature measurement of automobile brakes and installation of thermocouples This standard adopts the definitions, terms and symbols in QC/T239 and QC/T479. 4 Product structural dimensions
The structural dimensions of brakes shall comply with the provisions of Table 1. Table 1
Brake wheel cylinder diameter
Brake drum inner diameter
Friction pad width
Diaphragm brake chamber diameter
5Technical requirements
General requirements
Brake structure dimensions
17.46,20.64,22.22,25.40,28.57,30.00,32.00180,220,250,280,310,320
38 ,46,50,64,75,85,95,100
130，150
5.1.1 The brake shall comply with the requirements of this standard and shall be manufactured and assembled according to the drawings and technical documents approved by the prescribed procedures. Approved by the State Bureau of Machinery Industry on July 19, 2000 and implemented on August 1, 2000
JB/T10196.1-2000
5.1.2 Grease and dirt are not allowed on the surface of the brake lining. 5.1.3 The outer surface coating of the brake bottom plate shall comply with the provisions of TQ-4-SC-DM in JB/T5673. 5.1.4 The brake lining shall meet the provisions of GB5673. 5.1.5 The brake wheel cylinder shall meet the provisions of QC/T77. 5.1.6 The welded assembly of the brake shoe and brake shoe tendon shall be able to withstand a shear force of not less than 4.9kN. 5.1.7 Where the lining and the brake shoe assembly are bonded together, the shear strength of the bonding portion shall be greater than 2.94 MPa. 5.1.8 Where the lining and the brake shoe assembly are riveted together, the shear torque at each rivet shall be greater than 0.98 N·m. 5.2 Performance requirements
5.2.1 First running-in test
Perform the test in accordance with 8.2.2. When the contact area between the brake lining and the brake drum reaches 80%, the number of running-in times is 200 times. 5.2.2 First performance test
After the test in accordance with 8.23, the following requirements shall be met. 5.2.2.1 The braking torque output by the brake is: M≤M≤1.3 M
Where: M Braking torque rating, N·m
Mg Braking torque, N·m.
5.2.2.2 The speed stability of the brake output braking torque is: Three-wheeled agricultural transport vehicle: Vz (30-20)/≤10% Four-wheeled agricultural transport vehicle: [Vz (40-30)/≤10% Where: Vst (30-20), Vst (40-30) 5.2.3 The first recession recovery test
The difference in braking torque at different initial speeds. After the test specified in 8.2.4, the following requirements shall be met. 5.2.3.1 The first recession rate is:
F/≤25%
Where: F is the degree of reduction of the braking torque in the recession test, %. 5.2.3.2 The first recovery difference is:
[R≤20%
Where: R is the difference between the last braking torque in the recovery test and the reference braking torque, % 5.2.3.3 During and after the test, the brake should be able to be completely released without dragging. 5.2.4 The second performance test
After the test in accordance with 8.25, the requirements of 5.2.2.1 and 5.2.2.2 should be met. 5.2.5 The second decay test
After the test in accordance with 8.2.6, the following formula and the requirements of 5.2.3.3 should be met. The second decay rate is:
IF2/≤60%
5.2.6 The second running-in test
Perform the test in accordance with 8.27, and the number of running-in times is 50 times2
5.2.7 The third performance test
JB/T10196.1-2000
After the test in accordance with 8.2.8, the requirements of 5.2.2.1 and 5.2.2.2 shall be met. 5.2.8 After the assembly has completed the test items in accordance with 8.2.2-8.2.7, it shall meet the following requirements: 5.2.8.1 The brake shall be able to work normally.
5.2.8.2 The working surface of the brake drum shall be free of scratches 5.2.8.3 The brake base plate shall be free of deformation that affects the performance of the brake. 5.2.8.4 The brake lining shall be complete, without delamination or burning, and slight cracks are allowed. 5.2.8.5 The brake wheel cylinder and brake air chamber should not have oil or air leakage. Test equipment and instruments
6.1 Test equipment
Inertial test equipment (single-end or double-end) and measuring and recording instruments, 6.2 Instrument accuracy requirements
6.2.1 Instruments and meters that indicate and record various parameters shall have an accuracy level of not less than 1.5. 6.2.2 The measurement and control error of the brake input and brake temperature shall be ±3%, the shaft speed error of the test bench shall be ±2%, and the error of the test moment of inertia (including the inertia of the rotating part of the test bench) shall be ±5%. 7 Test conditions
7.1 The measurement of brake temperature shall be in accordance with the provisions of QC/T556. 7.2 The shaft speed value of the test bench mounted brake drum shall be determined in accordance with the provisions of 7.1.5 of QC/T479-1999. 7.3 The determination of the moment of inertia of the test bench shall be in accordance with the provisions of 7.1.6 of OCT479-1999. For three-wheeled agricultural transport vehicles with only rear brakes, β=0.
7.4 Cooling conditions
The test is carried out at room temperature, and the brakes are cooled by a ventilator. 8 Test method
8.1 Preparation
8.1.1 The test brake samples are provided by the manufacturer, and the number of samples is three. Check whether the test brake meets the factory technical conditions and whether there are any abnormalities in each part. 8.1.2
8.1.3 Install temperature sensors at the temperature measuring points of the brake drum and brake lining. 8.1.4 Install the test brake on the inertia test bench and adjust the gap between the brake lining and the brake drum according to the requirements of the drawing. 8.1.5 Connect the input hydraulic (air) pressure pipe and check the sealing of each joint. If it is hydraulically driven, the air in the hydraulic pipeline and the brake wheel cylinder should be removed.
8.1.6 According to the parameters to be measured in each test item, select and adjust the test instrument, calibrate the sensors such as input pipeline hydraulic (gas) pressure, output braking torque, friction pair temperature, etc., and draw the calibration curve. 8.2 Test items and procedures
8.2.1 Visually inspect the appearance quality of the brake. 8.2.2 Running-in
8.2.2.1 Test method
JB/T10196.1—2000
a) Initial braking speed: 20km/h for three-wheeled agricultural transport vehicles and 30km/h for four-wheeled agricultural transport vehicles; b) Braking input: For three-wheeled agricultural transport vehicles, the braking deceleration reaches 0.20g; For four-wheeled agricultural transport vehicles, adjust the brake line pressure to make the braking deceleration reach 0.30g. Brake from the initial braking speed to the final speed of zero: c) Braking interval is determined by controlling the initial temperature of the brake to not exceed 65℃±5℃: d) The number of running-in times is determined so that the contact area between the brake lining and the brake drum reaches more than 80%. 8.2.2.2 Measurement items
Measure the output braking torque value every 50 braking times. 8.2.3 The first performance test
8.2.3.1 Test method
a) Initial braking speed: Three-wheeled agricultural transport vehicle: 20km/h and 30km/h; Four-wheeled agricultural transport vehicle: 30km/h and 40km/h. The initial braking speed should be gradually changed from low speed to high speed. b) Braking input: For three-wheeled agricultural transport vehicle, the braking deceleration should reach 0.1g~0.5g; for four-wheeled agricultural transport vehicle, the braking deceleration should reach 0.1g~-0.65g of the brake line pressure, or according to the liquid (gas) pressure range used by the tested brake on the agricultural transport vehicle, every 0.1g as a level or every 1MPa as a level, and brake from the initial braking speed at the specified braking deceleration or brake line pressure each time until the speed reaches zero.
c The initial temperature of the brake is controlled at 65℃±5℃. d) Number of braking times: Brake once at each initial braking speed and each braking deceleration or brake line pressure, and perform at least five times within the entire range of brake line pressure or braking deceleration. 8.2.3.2 Measurement items
Each time you brake, record the initial braking speed, braking deceleration, brake line pressure, output braking torque, initial brake temperature, and braking time. 8.2.4 First fade-recovery test
8.2.4.1 Benchmark calibration
Initial braking speed: 20 km/h for three-wheeled agricultural transport vehicles and 30 km/h for four-wheeled agricultural transport vehicles. Braking deceleration: 0.3g for three-wheeled agricultural transport vehicles and 0.45g for four-wheeled agricultural transport vehicles. Adjust the braking input/brake line pressure so that the braking deceleration is the specified value, brake from the initial braking speed to the final speed of zero, and perform three benchmark calibrations. The initial temperature of the brake is controlled below 65°C ± 5°C. 8.2.4.2 Decay test
a) Initial braking speed: 30km/h for three-wheeled agricultural transport vehicles and 40km/h for four-wheeled agricultural transport vehicles. b) Braking input: For three-wheeled agricultural transport vehicles, the braking deceleration reaches 0.3g. For four-wheeled agricultural transport vehicles, the braking line pressure is adjusted to make the braking deceleration reach 0.45g.
c) Initial brake temperature: The initial brake temperature is controlled at 65℃±5℃ during the first braking, and the fan is turned off. d) Braking cycle is 60s.
e) Number of braking times: Braking from the specified initial braking speed until the speed reaches zero, 15 times. f) After the decay test, the brake drum is operated at a speed equivalent to 30km/h. The fan is turned on at a wind speed of 10m/s to cool the brake for 3min before starting the recovery test.
8.2.4.3 Recovery test
JB/T10196.1—2000
a) Initial braking speed: 20km/h for three-wheeled agricultural transport vehicles and 30km/h for four-wheeled agricultural transport vehicles. b) Braking input: For three-wheeled agricultural transport vehicles, the braking deceleration reaches 0.3g, and for four-wheeled agricultural transport vehicles, the braking deceleration reaches 0.45g by adjusting the brake line pressure.
c) Cooling: The brakes are cooled at a wind speed of 10m/s during the entire test. d) The braking cycle is 60s.
e) The number of braking times is 10 times.
8.2.4.4 Measurement items
For each braking, record the initial braking speed, brake line pressure, braking deceleration, output braking torque, brake drum temperature, brake lining temperature, and braking time.
8.2.5 Second performance test
8.2.5.1 Test method
Same as 8.2.3.1.
8.2.5.2 Measurement items
Same as 8.2.3.2.
8.2.6 Second fading test
8.2.6.1 Fading test
a) Initial braking speed: 20km/h for three-wheeled agricultural transport vehicles, 30km/h for four-wheeled agricultural transport vehicles. b) Braking input/brake line pressure, so that the braking deceleration reaches 0.07g. c) Control mode: constant output braking torque, dragging mode. d) Braking time: 48s (mechanical), 40s (hydraulic), 12s (pneumatic) for each dragging, 72s (mechanical), 60s (hydraulic), 18s (pneumatic) for the dragging interval, and 1680s for the total time. e) Initial temperature of the brake: The brake temperature is room temperature during the first dragging. Cooling: Turn off the fan during the test. 8.2.6.2 If the test equipment cannot perform constant output control and dragging, the following method can be used: Initial braking speed: Three-wheeled agricultural transport vehicles are reduced from 30km/h to 10km/h, and four-wheeled agricultural transport vehicles are reduced from 40km/h to 10km/h. Braking input: Three-wheeled agricultural transport vehicles make the braking deceleration reach 0.2g; four-wheeled agricultural transport vehicles adjust the brake line pressure to make the braking deceleration reach 0.3g.
Initial temperature of the brake: Room temperature before the first braking. The braking interval is 40s.
The number of braking times is 60 times.
8.2.6.3 Measurement items
Each time the brake is applied, record the brake deceleration, brake line pressure, output braking torque, brake drum temperature, brake lining temperature, observe and record the burnt smell and smoke emitted by the brake lining during the first braking. 8.2.6.4 Appearance inspection
After the test, turn on the ventilator to run the brake at a low speed until its temperature is consistent with the room temperature. Check whether the brake lining has cracks, carbon deposits, burns, and whether there is a bright film on the friction lining surface. 5
8.2.7 Second running-in
JB/T10196.1-2000
Perform the test of 8.2.21, but the number of braking times is 50. 8.2.8 Third performance test
8.2.8.1 The test method is the same as 8.23.1.
8.2.8.2 Measurement items are the same as 8.23.2.
8.3 Record
All test results shall be recorded in the format specified in Appendix A (Suggested Appendix). 8.4 Test result processing
After the first and second performance tests, draw the relationship curve between braking torque M and pipeline pressure p or deceleration. After the first decay-recovery test and the second decay test, draw the relationship curve between braking torque M and temperature T and the number of braking times. 9 Inspection rules
9.1 Each product shall be inspected and qualified by the inspection department of the manufacturer before it can be shipped out of the factory, and the documents proving the product's qualification shall be attached. 9.2 Products shipped out of the factory shall be inspected in accordance with 8.2.1 and meet the requirements of 5.1.1, 5.1.2 and 5.1.3. 9.3 For mass-produced and batch-produced products, random inspections shall be carried out regularly. The test methods shall be in accordance with 8.2, and the test results shall comply with the provisions of Chapter 5. 9.4 For new products that have been finalized or have major improvements in structural dimensions and materials, and products that have been transferred to other factories, they shall be tested in accordance with 82, and the test results shall comply with the provisions of Chapter 5.
9.5 The ordering unit has the right to conduct random inspections on the products received, and the sampling plan shall be agreed upon by the supply and demand parties. 10 Marking, packaging, transportation and storage
10.1 Marking
Each product shall be marked in a conspicuous position: a) Product model;
b) Trademark:
c) Manufacturer's name:
d) Manufacturing date and batch number.
10.2 Packaging
10.2.1 The packaging box shall be accompanied by a product certificate, which shall contain the following contents: a) Product name and model:
b) Manufacturer's name;
c) Inspection date:
d) Signature of the quality inspection department.
10.2.2 The outside of the packing box should be marked with:
a) Product name:
b) Manufacturer name:
c) Quantity:
d) Packing date:
e) Model.
10.3 Transportation
JB/T10196.1—2000
During transportation, the brake assembly should not be damaged or contaminated by oil or water. 10.4 Storage
The brake should be stored in a ventilated and dry room7
JB/T10196.1-2000
Appendix A
(Suggested Appendix)
Record table and graph format
A1Record table see Table Al~Table A5,
Graph format see Figure A1~Figure A3
Brake parameter table
Brake parameters
Front and rear braking force ratio
Wheel cylinder diameter
Gap between friction lining and brake drum
Sample number
Test date
Run-in method
Brake drive method||tt| |Brake type
Friction lining width, length, thickness
2First (second) running-in
Operator
Brake line pressure pMPa or braking deceleration g
Number of running-in
Contact area %
3First (second, third) performance test
Sample number
Test date
Brake line pressure pMPa or braking deceleration gBraking torque M
Brake drum temperature Tdrum℃
Friction lining temperature Tinch℃
Drum Braking time ts
Operator
Sample number
Test date
Test vehicle speed
Brake line pressure pMPa
Braking torque M
JB/T10196.1—2000
Figure A1 The first (second, third) performance test Table A4 The first fade test and recovery test Room temperature
Operator
Test bench installation Brake drum shaft speed
Or braking deceleration
Brake drum temperature T℃
Friction lining temperature Tinch piece ℃
Braking time ts
Sample number
Test date
Test vehicle speed
JB/T10196.1-2000
2First fade test and recovery test
Second fade test
Operator
Test bench installationBrake drum shaft speed
Brake line pressure pMPa
Braking deceleration g
Brake drum temperature T℃
Friction lining temperature Tcun piece ℃
Braking time ts
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