GB/T 3871.6-1993 Test methods for agricultural wheeled and tracked tractors Part 6: Braking test GB/T3871.6-1993 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of ChinabZxz.net
GB/T 3871. 1~3871. 1293
Test methods for agricultural wheeled and track tractorsTest methods for agricultural wheeled and track tractors1993-03-03 Issued
1993.10-01 Issued
National Standard of the People's Republic of China
Test methods for agricultural wheeled and track tractorsPart 6 Braking test
Tesl methods Inr agriculturalmrsl wheeled aud tracilaylog TractorsPar1 .Braking tests
GB/3871.6-93
38153
The standard adopts the international standard 15697-1982. Agricultural and forestry vehicle brake performance test 3. Content and scope of application
This standard specifies the test methods for the parking braking performance of agricultural wheeled and belt-type tractors and the driving braking performance of wheeled tractors and the operating force measurement method
This standard applies to agricultural wheeled and belt-type tractors. 2 Reference standard
(-日/3871.! Industry integral and display control puller test method Part 1 General requirements 3 Test instruments and equipment and parameter measurement accuracy 3.1 Test instruments and equipment
must include: manipulation force device, pulling juice, five-wheel instrument, timer, steel ruler, channel control meter, anemometer and test control channel, etc. 3.2 Parameter measurement accuracy
points meet the following requirements, travel frequency +5 light, braking distance ±1%, excavator quality 3% of the base, ≤5% of the brake force, and 10% of the wheel pressure. The brake system fluid or air pressure is ≤5%. 4 Test performance
4.1 The general requirements for the technical status test of the tractor shall comply with the relevant provisions of GB3571.1. 4.2 The test ramp and road for the wheeled tractor shall be as long, straight, dry, and clean as possible, and the friction coefficient shall not be less than 10.8 when the slip rate is 15%. The test slope is the slope specified in the relevant standards. The longitudinal slope of the driving test track is not more than 1%, and the transverse slope is not more than 3%. 4.3 Except for the regulations, the control machine should be equipped with the specified weight in the operating instructions for the test. 4. During the test, the height of the ground is not more than 1.m, and the air pressure is 2 ± 13. Test method
5.1. Break the kinetic energy test
Put the puller 100% On the specified slope, select neutral gear, fire, and use the parking brake device to move. Measure the force acting on the tractor (or road plate) when the tractor is stopped (disengaged) and can be held to 5N. The direction of the force should be as flexible as possible to minimize the effort of the pedal or the brake. The test is carried out three times and the average value is taken. The test is carried out in two states: upper and lower control. The National Technical Supervision Bureau approved it on March 3, 1993. 1953101 implementation
GB/T 3871.6-53
5.2 Special braking performance test (apparatus for wheeled tractors) 35.2.1 Cold braking performance test
The test should be carried out in two states: with and without auxiliary brakes. The service brakes must be in a "cold state" before the start of the test. For those who meet the following conditions, the brakes are in a "cold state"\a. The brakes are in: h The above have not been used: b. The temperature measured on the brake disc or the outside of the brake drum is greater than 1 °C; for fully enclosed brakes (including high-speed brakes), the temperature measured on the outer surface of the shell is less than 0. During the test, wait for the temperature to stabilize at the end of the test, and apply a certain frequency of force to the clutch pedal of the tractor until the tractor comes to a complete stop. The longitudinal force should remain unchanged during the braking process: the point of action should be in the middle of the pedal and the direction of the force should be the direction of least effort. Measure the speed of the tractor before braking, the pedal force and the operating force of the brake pedal. Repeat the reverse test. The test starts from the main force until the brake reaches 600 (the smallest one). The brake part should be "cold".
When the braking frequency is large: the brake marks of the left and right wheels should also be measured. For four-wheel drive tractors, if the instruction manual stipulates that two-wheel drive is used for transport operations, the test is only carried out in the two-wheel drive state. If otherwise specified, the test is carried out in two-wheel drive (if it can be disengaged) and four-wheel drive states. 5-2.2 Hot Braking Performance Test
Before carrying out this test, the tractor under test should undergo the test in 5-2.1. Within 3 m after the whole machine has been run in any of the following ways, the state of its service brakes can be considered as the "severe state":
a. Apply the force of 5.2.1 on the brake pedal of the tractor under test and obtain a level of 1m/* minus 19. The machine is tested and travels at a speed of 5% to % of the normal speed for 1 km:h. The tractor to be tested is in neutral gear, and the tractor is pulled horizontally by the pulling force. The tractor brake is operated to make the engine produce 10% of the required force and keep it constant. The tractor runs at a speed within 5% of the maximum speed of the tractor under test. When the tractor brake is in the "hot state", the test is carried out by recording force method. The maximum force applied at this time is the maximum force as shown in Section 2 of Section 5.2.1. 5.3 The longitudinal travel of the tractor brake is measured. The distance between the tractor brake and the target brake is the distance between the target brake and the target brake. 6 Test results and report
For the test in Article 6.15.2, calculate the average deceleration of the tractor according to formula (1): as.
Where: - average deceleration of the tractor to the moving object, m/3; tractor's braking distance before braking, m/s;
s; tractor's braking distance m
6.2Calculate the attenuation coefficient of the rear braking energy according to formula (2) in Article 5.2.2: axm
Where:
Gn/T 3871.6-33
1 The braking performance of a tractor is good, and the average deceleration level is 6.3 m/m in the test avoidance of 5.2.1 and 5.2.2 respectively. The results are recorded in the summary table, and the relationship diagram of the control deceleration degree 4 and the seasonal force + is given. According to the relevant provisions of B/T871.1, a single test report is written:
Summary table of brake test results
Test protection.
Test road
Card plan fat formula whole list
Net intentional brake performance test whole situation failure; || tt||Test period
Hot brake heating method
Test number
Whether to stop
Two-wheel sub-drive
Model force
Cohesion
Braking distance density
Uniform connection
Fast braking force, N
Four-wheel drive
Toughness
Plain test speed:
Hot brake performance test result:
Two-light drive
With age
Four-wheel drive
GH/ 3871.6-93
lifting force
cold brake test start receiving people learning system when five right inspection brake print through the British driving cutting road plate (with frequency pole> General Book Attached Figure:
Loading Station:
Additional Notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is from the National Excavator Standard Purification Technical Committee, m
cold no fertilizer oil
high can be raised
This standard is drafted by the Mountain Machine Money from the upper industry tribe Japan Machine Research Institute, this standard relies on soil to start a single person money into, clean. 30
Heisei Note Method
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