Some standard content:
ICS65.060.10
Machinery Industry Standard of the People's Republic of China
JB/T9826—1999
Tractor differentials
Test methods
Tractor differentialsTest methods1999-08-06Published
National Machinery Industry Bureau
2000-01-01Implementation
JE/T9826—1999
This small standard is a revision of NJ377—85 "Test Methods for Tractor Differentials". During the revision, the original standard was revised and the relevant test tables were added. The main contents did not change. This standard replaces 377-85 from the date of implementation. This standard was proposed by the National Tractor Standardization Technical Committee: 1. The responsible person for this standard is: Shandong Guanfang Tractor Factory, Luoyang Shifan Machinery Research Institute. The main supervisors of this standard are: Jian Gang, Zhang Zhitong, Li Manjun. 1 Scope
Chinese Machinery Industry Standard
Tractor Differential
Test Method
Traetor Differentials --- Test Methods This standard specifies the tractor differential test method. This standard applies to the front and rear axle differentials of tractors. 2 General
2. 1 Test items
a) Platform reliability test;
b) Static torsion test:
c) Installation reliability test,
2.2 Inspection requirements and sampling
2.2. The test samples are randomly selected from the qualified products of the case. 7.2, 2 Before conducting the customer test, please follow 2.3 for the test. 2.2.3 The test data shall be recorded and processed accurately and reliably. 2.3 Running-in before the test
18/08261999
代蓉N75
Brake either end of the differential and connect the differential case to the speed specified in Table 1 for running-in. After a period of time, cancel the brake and then apply a full load to the inner end of the differential under dynamic conditions. Recommendation: Make the speed of both ends of the differential reach the requirements of Table 1 by adjusting a full load. After running-in, replace the oil.
Differentiator six
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Differentiator transfer
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End transfer pad
The speed and transfer short circuit formula (·Formula (4) in Table 1 are calculated iu,
National Machinery Industry Bureau 1059-08-06 Standard operation time
Every 5min, the two state wheels are fast
Brake 1
Year interval smil Left and right, two eliminations
1 speed
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2000-01-01 implementation
JB/T9826-1999
-0.5At,F.
Where: n,—differential charging speed, mi:R engine rated speed, rmi:
Central transmission ratio:
For a pair of rear-wheel drive tractors, it is a high-speed gear limited by the performance of the attachment or for a four-wheel drive tractor, it is a speed gear close to 7km/h. Transmission ratio of the gearbox:
—The transmission ratio of the gearbox with the highest transport operation gear; 4, M is applied to the differential =The torque of the engine, N·m: M—Rated torque of the engine, N·m
G, the sum of the load capacity of the left and right driving wheels, N: P,-The adhesion coefficient of the engine, take 0.65
T. "Drive wheel power radius, m;
.-The most effective transmission ratio:
Measure the final drive efficiency:
Measure the transmission efficiency of the gearbox for high-speed transportation operation gear, central transmission efficiency,
Note: The power efficiency of a single pair of gears can be selected within the following range: 0.97-0.98 for the master gear: 0.9-0.97 for the row gear. 3.1 Test preparation
3.1.! At each of the planetary gear shafts Mark the end faces and the corresponding planetary gears for identification. 3.1.2 If the gears are not lined, mark the bushing and the end faces of the planetary gears to check whether there is rotation between the bushing and the planetary gear.
3.1.3 Continue to measure the following:
) The inner diameter of the planetary gear or bushing:
) The thickness of the planetary gear gasket (including the gasket connected to the bushing) and the distance between the thrust surfaces of the two rows of gears on the differential case:
) The shaft diameters of the planetary gear shafts:
d) The matching hole diameter of the planetary gear shaft on the differential case should be the inner diameter of the bushing; the shaft diameter of the axle gear
The thickness of the axle gear gasket and The distance between the thrust bearings of the two half-axle gears on the differential body: 1) The diameter of the hole or the inner diameter of the sleeve on the differential cover that matches the half-axle gear; 2) The dimensions of other relevant parts.
3.1.4 Technical requirements for replacement of differentials: 2
3.1.5 Run-in according to 2.3,
3.2 Test monitoring equipment
JB/9826—1999
Open test bench for transmission system, oil temperature measuring device, light torque measuring device with a resistance of not less than 1.0%, rear axle box, 3.3 Dangerous conditions
3.3.1 The product is installed in the rear axle box according to the design requirements, 3.3.2 The lubricating grade and oil surface should meet the requirements of the instruction manual. 3.3, 3 The oil temperature measuring device is installed on the oil drain plug of the rear axle box or other appropriate products. 3.4 Test piece method
3,4.! Large torque and small speed differential test
Change the table 2 to set the dynamic differential and apply load to both ends of the differential steadily under dynamic conditions, change the load at one end to adjust the speed difference between the two ends of the differential, one cycle every 5m, and perform 200 cycles. 3.4.2 Small torque and large speed test
Brake one end of the differential, then reverse the dynamic differential case as specified in table 2, and apply load to the free end of the differential under dynamic conditions, run for 30m,
The total speed of the differential is
The speed difference of the differential
No torque and small speed difference test
Small torque and large speed difference to test
|The rotation time
200 live rings
one for every m, including:
L cut-off process 0.min
Running mr:
cut-off process Smm
Running Imin
This test is registered with the same number as 1
The engineer of the company should issue the same test report
The oil temperature shall not exceed 90°C during the test. If the oil temperature is suddenly high or there are other abnormal sounds, the test shall be stopped immediately and a final inspection shall be carried out
3.5.1 After completing the test, each differential shall be visually inspected and tested. For any faults found and parts that have not failed but have exceeded the specified limit, precision measurement shall be carried out on representative wear areas. For new products, the prototype should be disassembled and inspected according to the test positions in 3.1.3-3.1.4 before the test, and disassembled and inspected again after the test, and the use status of each moving pair should be observed, and the damage phenomena such as burning, bonding and excessive damage should be recorded in Table 3 and Table 4 respectively. The cumulative operation time is calculated based on the end time of the test. 3.5.2 During the disassembly inspection, the difference between the measured dimension and the drawing dimension is the nominal wear value; the difference between the two measured values before the test is the actual wear limit value of each part. According to the provisions of the relevant standards or work documents. 3.5.3 List the test results before and after the test and the actual status after the test in a table and include it in the test report. 3
Test end period
Specified test time
Prototype
Test start plan
Specified test time
Static torsion test
4. Test preparation
Fault name
JB/T9826-1999
Table 3 Speed speed gear frame reliability test fault summary and test points.
Test person in charge
Result plan
Working hours
Reason for failure
Special
Elimination method
Table 4 Summary of wear measurement results of differential test results Test points
Nominal size median value
Final source
Front repetition
Reduction number
Test person
Nominal reported value or
Actual torque value
Disassemble the differential parts, then reassemble according to the technical requirements, and run-in according to 2.3. 4.2 Test equipment
It is recommended to use a torque machine
4.3 Test method
Specified
4.3.1Fix the differential housing firmly on the test bench and fix the half-shaft gear at one end: Apply load steadily and quasi-ground on the shaft gear at the other end until the torque reaches the calculated value in formula (5). Then remove the cut-off and observe whether the speed reducer has permanent deformation. Repeat for 3 times.
武中：格
JB/T9826—199g
MM, s
Torque applied to a pair of differentials, N·m;
The torque value of formula (3), N·m:
9——Safety factor, take 3.
4,3.2武Disassemble and inspect after the test, observe whether the parts have distortion, cracks and other damage phenomena, and make records and include them in the test report. 5 Installation reliability test
5.1 Test equipment and instruments
Connect the tractor prototype, micro-trolley or boat, tensioner, wire rope, oil temperature measuring device, and thermometer. 5.2 Test preparation
5.2. Prepare the test differential according to 3.1.1~3.1.4. 5.2.1 Install the differential into the tractor prototype and adjust the tractor to meet the requirements of the instruction manual. 5.3 Running-in
Use the vehicle with limited adhesion at high speed or close to 7.5 km/h, and make left and right turns with a relatively large radius without load to engage the speed limiter. 1h in total.
5.4 Test method
5.4.1 No-load driving "8-hour test"
The engine is at the rated speed, the rear-wheel drive tractor is at the maximum speed subject to the restrictions, or the four-wheel drive tractor is at a speed close to 7.5km/h (lower period), the left and right single-side brakes are used alternately on a concrete or hard road surface, and the tractor is driven on a "B"-shaped route with a small turning radius, and the operation is carried out for 8h.
: Left, for single-side braking, the vehicle that is braked can have If there is a phenomenon of kidney rotation, the test should be stopped, checked and adjusted. 5.4.1 Load-carrying driving \s\ character testWww.bzxZ.net
Use a wire rope to reversely connect the tension gauge to the traction device, and the other end of the tension gauge is connected to the load vehicle (ship). The engine is set to the calibration rotation, and the traction machine is driven at the maximum speed limited by the attachment or at a speed close to 7.5km/h: the traction force is M calculated by formula (3), and the value is % of the corresponding traction force. Drive on the "" shape route shown in Figure 1 on coal condensation or dry hard road surface. 1
JB/T 98261999
5.4.3 During the whole test period, record the oil temperature of the drive axle every 30 minutes. If the oil temperature exceeds 90°C or any abnormal response is found, the test should be stopped for inspection.
5.4.4 Record the ambient temperature at the beginning, middle and end of each test. 5.4.5 After the whole test piece is removed, make a physical test on the test part before the test. At the same time, observe whether each moving brush has burning, adhesion and excessive wear, and make a record. S.4.6 List the measurement results before and after and the condition of the moving brush in a table and include them in the test report.
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