JB/T 9720-2001 Performance test method for transmissions of construction machinery
Some standard content:
ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T9720-2001
Construction machinery
Transmission performance test method
Construction machinery-Bench test methods of transmissions2001-04-03 Issued
China Machinery Industry Federation
2001-10-01 Implementation
JB/T9720-2001
This standard is a revision of JB/T97201999 "Construction machinery transmission performance test method". During the revision, the original standard was retained, which was proved to be suitable for the requirements of my country's transmission products and the actual test conditions in practice; the standard format, oil pressure unit and test instrument were revised.
This standard will replace JB/T9720-1999 from the date of implementation. Appendix A and Appendix B of this standard are both prompt appendices. This standard is proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The drafting unit of this standard: Tianjin Engineering Machinery Research Institute. The main drafters of this standard: Xu Wenyuan, Cui Guomin This standard was first issued in April 1988 as ZBJ85001-87, and the standard number was adjusted to JB/T9720-1999 in April 1999. This is the first revision.
Machinery Industry Standard of the People's Republic of China
Construction machinery-Bench test methods of transmissions
Construction machinery-Bench test methods of transmissions1 Scope
JB/T9720-2001
Replaces JB/T9720-1999
This standard specifies the test items, test equipment, test accuracy, test methods, test data processing and other contents of the basic performance test of the power shift transmission of construction machinery.
This standard is applicable to the performance test of the power shift transmission of construction machinery (hereinafter referred to as the transmission). Mechanical shift transmission test can also be used for reference.
2 Referenced standards
The clauses contained in the following standards constitute the clauses of this standard by being referenced 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 versions of the following standards. GB/T3785-1983 Electrical and acoustic performance and test methods of sound level meter 3 Test items
a) Transmission no-load power loss test;
b) Transmission transmission efficiency test;
c) Transmission shift process test;
d) Transmission oil pressure test;
e) Transmission noise test.
4 Symbols and units
The names, symbols and units of transmission test parameters and calculation parameters are shown in Table 1. 5 Test equipment
5.1 This standard recommends an open test bench. The bench consists of: power machine, loading equipment, fastening connection device, auxiliary system, etc. 5.2 The power machine can be a DC motor, a DC dynamometer, an AC speed regulating motor, a diesel engine, etc. 5.3 The loading equipment can be a DC dynamometer, a DC generator, an eddy current dynamometer, a hydraulic system or a hydraulic dynamometer, etc. The test bench layout is shown in Figure 1.
5.4 The auxiliary system includes an oil supply system and a water supply system. The oil supply system should meet the maximum oil supply pressure and flow rate when the transmission is working, and can be adjusted continuously. Heating and cooling devices should be installed in the system. The water supply system should ensure that the flow rate is sufficient and the water flow is stable and adjustable. 5.5 The transmission no-load power loss test and the transmission efficiency test use independent oil supply systems. 5.6 The test bench should ensure that the transmission operates normally within the specified test conditions, and each connecting part and the test piece should have good coaxiality. 5.7 The installation state of the transmission on the test bench should be the same as that on the main engine. Approved by China Machinery Industry Federation on April 3, 2001, implemented on October 1, 2001
JB/T9720-2001
3 In the test, use the same working oil as the transmission operation, 5.8
Remove various additional devices. When conducting tests other than a) and b) in Chapter 3, keep the speed change pump. 5.9
Parameter name
Input torque
Output torque
Rated torque of engine
Rated speed of engine
Input speed
Output speed
Torque converter inlet oil pressure
Torque converter outlet oil pressurebZxz.net
Operating oil pressure
Lubricating oil pressure
Main oil circuit oil pressure
Working oil flow
Inlet oil temperature
Outlet oil temperature
Torque converter turbine speed
Transmission speed ratio
Torque converter speed ratio
Input power
Output power
No-load power loss
Transmission efficiency
Ps (or ps)
i# (R)
1For a hydromechanical transmission, subscript 1 indicates the input (or import) parameter of the torque converter.
2P represents the clutch oil pressure of a two-degree-of-freedom transmission, P, and p represent the direction clutch oil pressure and speed clutch oil pressure of a three-degree-of-freedom transmission, respectively. 3iF(R>The subscript F in the formula indicates forward gear, and R indicates reverse gear. 2
DC dynamometer
DC motor
AC speed regulating motor
Upstream filter
Upstream motor
Diesel engine
JB/T9720—2001
DC motor (or eddy current dynamometer)
Torque sensorTorque converter
Transmission
Upshift
Torque sensor
AC speed regulating motor, upshift box
Speed regulating box
Torque sensor
Upshift box
Upshift box
Eddy current motor (hydraulic dynamometer)
Real flow Power generation system
Resistor dynamometer (or eddy current dynamometer)
Turbo sensor
Figure 1 Schematic diagram of test bench layout
Speed box
Eddy current brake (or hydraulic dynamometer)
Point current power generation
This low-energy system
6 Test accuracy
6.1 Stable accuracy of the measurement process
JB/T97202001
6.1.1 The torque fluctuation value of the test system shall not exceed 20.5% (referring to the full-load measurement value). 6.1.2 The speed fluctuation value of the test system shall not exceed 5r/min. 6.2 Instrument and meter accuracy
The capacity of the instruments and meters selected for the test should be adapted to the test range . The accuracy of the instrument is divided into two levels, A and B. The accuracy required for each level shall not be lower than that specified in Table 2.
Measurement parameters
Dr/minZ5r/min
Note: The percentage in the table refers to the percentage of the full-load measurement value. A
6.3 For transmission identification test and quality inspection, the instrument shall be of Class A: The transmission factory test instrument may be of Class B. 6.4 For no-load power loss and noise tests, the measurement accuracy of input torque and speed shall be of Class B. 6.5 When recording dynamic parameters, the measurement accuracy requirements are as follows: the measurement error of the secondary instrument of the pressure sensor is less than △.0%; the non-linearity of the torque analog output is not greater than Z1.0%: the non-linearity of the speed analog output is not greater than Z1.0%: the XY recorder measurement The measurement accuracy shall not be less than Z0.5%. 6.6 Before the test, the instrument shall be adjusted to zero position, and the zero drift shall not be greater than 0.2%. 7 Test preparation
7.1 Before the test, a test outline shall be drawn up, and its test items and test methods shall comply with the provisions of this standard. A
7.2 Instruments and meters shall be calibrated and calibrated in accordance with relevant national or industry standards, and shall be within the effective period of use. At the beginning and end of the test, the instrument zero point shall be checked. 7.3 The noise meter shall be able to measure the A sound level and meet the requirements for type 2 instruments in GB/T3785. 7.4 Before the transmission test, the original characteristic test of the matching hydraulic torque converter shall be carried out, and a test report shall be prepared. 7.5 For the efficiency test of the transmission, each gear shall be run-in before the test. The recommended running-in method is as follows: 7.5.1 Load at the output end of the transmission, and the loading torque is the product of 1/2 of the turbine torque of the matching hydraulic torque converter at zero speed at rated speed and the speed ratio of the gear.
7.5.2 The input speed of the transmission with a torque converter shall be the rated speed of the matching engine; for a single transmission without a torque converter, the input speed shall be 1/2 of the rated speed of the matching engine. 7.5.3 Run-in for 1 hour in each gear
7.5.4 The working oil temperature is not higher than the formal test oil temperature. 7.5.5 After running-in, the transmission should be thoroughly cleaned and new oil should be replaced before the formal test. 7.6 Inspection before the test
JB/T9720-2001
7.6.1 Check whether the transmission operates normally in each gear and whether there is any abnormal sound and vibration. 7.6.2 Check the sealing of the transmission and hydraulic system. 7.6.3 Check whether the measuring instruments work normally. 7.6.4 Check whether the oil supply and oil pressure of the hydraulic system are within the specified range. 8 Test method
8.1 No-load power loss test
8.1.1 Test conditions
8.1.1.1 Test bench layout Refer to Figures 1 and 2. The transmission output shaft should be idling without load. 8.1.1.2 Test in all gears of the transmission. The control valve shall not be adjusted during each gear test. 8.1.1.3 The inlet working oil temperature of the transmission (or torque converter) is 85℃ ± 5℃. 8.1.1.4 The oil supply flow rate should be close to the rated flow rate of the transmission pump, and the oil level of the oil pan should be kept at the specified height. 8.1.2 Test procedure
8.1.2.1 Start the power machine, increase the speed to the set value, and test after the operation is fully stable. The recording of each data should be synchronized. Generally, the initial input speed is not less than 600r/min, and the maximum input speed is the rated speed of the engine. 8.1.2.2 The intervals between the test points are distributed in equal intervals according to the input shaft speed. The intervals are generally not greater than 200r/min. 8.1.2.3 When conducting no-load loss tests on a single transmission, a special tool should be used to directly input power to the turbine shaft. The test method is the same as 8.1.2.1 and 8.1.2.2.
8.1.2.4 Test parameters include: input torque Ti, input speed ni, inlet oil temperature ti, working oil flow Q, clutch oil pressure p (or p3, p).
Repeat the test three times in the same way
8.1.3 Draw the relationship curve between the no-load power loss and input speed (or input torque and input speed) of each gear of the transmission Pk=f(n) or T,=f(n).
8.2 Transmission efficiency test
8.2.1 Test conditions
8.2.1.1 The layout of the test bench is shown in Figure 1. 8.2.1.2 The test is carried out in all working gears of the transmission. The control valve shall not be adjusted during the test of each gear. 8.2.1.3 During the test, the inlet oil temperature of the transmission equipped with a hydraulic torque converter is 90℃±10℃, the outlet oil temperature is not more than 120℃, and it does not exceed 130℃ for a short time: when testing a single transmission, the inlet oil temperature is 85℃±5℃. 8.2.1.4 The oil supply to the transmission should be close to the rated flow of the transmission pump, and the oil level of the oil pan should be kept at the specified height. 8.2.2 Test method for transmission with torque converter 8.2.2.1 During the test, the input speed is kept constant, and the input speed is taken as the rated speed of the engine. 8.2.2.2 At the beginning of the test, the output shaft is first idle, and the input speed is increased to the set value. After the operation is fully stable, the data is recorded, and then the output shaft is loaded in increments according to the set increments to reduce the output speed and keep the input speed constant. 8.2.2.3 The interval of the loading torque is distributed in arithmetic according to the torque of the output shaft. The interval is appropriately reduced near the highest efficiency and the working state conversion point. The output shaft speed interval should not be greater than 1/10 of the output shaft idling speed. 8.2.2.4 The minimum value of the transmission output shaft speed is selected at the zero speed condition of the torque converter for the lowest gear, and the input torque does not exceed the maximum torque of the engine 5
JB/T9720-2001
. For other gears, select nz ≤ 0.3n/if (R). 8.2.3 Test procedure for single transmission
8.2.3.1 Constant speed test
8.2.3.1.1 Take two input speeds for testing respectively. High speed n, = 0.8nHe (select n, = 0.6nme for overdrive), low speed n, = 0.4ne. 8.2.3.1.2 At the beginning of the test, first let the power machine idle, increase the input speed to the set value, and record the data after the operation is fully stable. Then the output shaft is loaded one by one, and the input speed is kept constant. 8.2.3.1.3 The interval of loading torque is distributed arithmetically according to the torque of the input shaft. 8.2.3.1.4 The maximum value of the transmission input torque is determined according to the input speed, and its value shall not exceed the rated power transmitted by the transmission. 8.2.3.2 Constant torque test
8.2.3.2.1 The transmission input torque is selected as 2THe, 1.5THe, 1.0THe, and 0.5THe respectively. 8.2.3.2.2 Start the power machine and increase the input speed to the starting test speed. Increase the load to the set value and record the data after the operation is fully stable. Then increase the input speed step by step and keep the input torque constant. 8.2.3.2.3 The starting test speed shall not be less than 600r/min, and the speed interval shall be distributed arithmetic according to the input speed, and the interval shall not be greater than 200r/min. 8.2.3.2.4 The maximum value of the transmission input speed is determined according to the input torque, and its value shall not exceed the rated power transmitted by the transmission. 8.2.4 The transmission efficiency test records the following parameters: T, T, ni, n2, PI, P2, P3 (or p3,), P4, Ps, t, t, Q. The recording of each parameter is kept synchronous.
8.2.5 The same test is repeated three times.
8.2.6 For the transmission with torque converter, the relationship curve between efficiency and output speed of each gear is n=f(n2), and the relationship curve between output torque and output speed is T=f(n2. For the single transmission, the relationship curve between efficiency and output speed is n=f(n2) [constant torque]: the relationship curve between efficiency and output torque is n=f(T,) [constant speed], and the relationship curve between output torque and output speed is T,=f(n2). 8.3 Gear shifting process test
This test is not performed on the single transmission.
8.3.1 Test conditions
8.3.1.1 The test bench is arranged on the basis of that shown in Figure 1, but the loading device is changed. 8.3.1.2 The test is loaded with inertial load. The translational inertia of the main engine matched with the tested transmission is converted to the rotational inertia of the transmission output as J, and the test bench The inherent moment of inertia of the loading equipment is J, and the flywheel inertia Jr=J-Jy that needs to be added during the test. 8.3.1.3 Take the transmission input speed nl=0.8nHec8.3.1.4 The transmission inlet oil temperature is 85℃±5℃. 8.3.1.5 The working oil flow rate is the same as the external oil supply during the transmission efficiency test, or use its own speed change oil pump to supply oil. 8.3.2 Test procedure
8.3.2.1 Convert the transmission output torque T2, input speed nl, output speed n2, and clutch operating oil pressure p (or pg, p) into analog signal output. Determine the calibration value of each sensor before the test. 8.3.2.2 Start the power machine and increase the transmission input speed to the set value. Operate the shift lever from neutral to each forward gear, and then return (ie NF-FF2-FN), and then from neutral. Go to each reverse gear in turn, and then return (i.e. N→R, -R, \R, -R, →N). 8.3.3 Record the dynamic change curves of the following parameters ni, n2, T, Ps (or p3, p), as well as the values of ti, t2, Q, etc. The recording format is shown in Table Al of Appendix A (Suggested Appendix). 8.3.4 Dynamic parameter recording can be carried out using a tape recorder, photoelectric oscilloscope, XY recorder, microcomputer acquisition system, etc. 6
8.4 Working oil pressure test
8.4.1 Test conditions
8.4.1.1 See Figure 1 for the layout of the test bench.
JB/T9720-2001
8.4.1.2 The transmission is supplied with oil by its own oil pump. The input shaft speeds are ni=nHe and n,=700r/min respectively. The output shaft of the transmission should be unloaded and empty
8.4.1.3 The transmission inlet oil temperature is greater than 80℃. 8.4.2 Test procedure
8.4.2.1 Convert the clutch operating oil pressure P (or p3, p) into analog output, and determine the calibration value of the sensor before the test. 8.4.2.2 Start the engine and increase the speed to the set value. After stable operation, measure the following parameters: PI, P2, P (or p3, p), P4, P5, Q, ti. The measurement is carried out in all working gears and two input speeds. The record table is shown in Table A1. 8.4.2.3 The engine speed n=nHe, after stable operation, operate the shift valve stem from neutral to each forward gear in sequence, and then return (i.e. N→F, F2F2-F,→N), and then from neutral to each reverse gear in sequence, and then return (i.e. N→R→R, R,→R,→N). 8.4.2.4 The power machine speed n, = 700r/min, after stable operation, perform the gear shifting operation in 8.4.2.3. For the three-degree-of-freedom transmission, perform the forward and reverse operations of each speed gear (such as N-→F→R, →F→F, →R, →F2-→F, →R, →R, →R→N). 8.4.3 Record the following parameters of each gear under two input speeds: Pi, P2, P3 (or p3, p), P4, Ps, ti, Q, and record the change curve of the clutch operating oil pressure p (or p3, p) during the gear shifting process. See Table A1 for the record table. 8.4.4 Measure the operating force of the shift valve stem before (or after) testing the clutch operating oil pressure, and record the measurement results in Table A2. 8.4.5 The recording instrument is the same as 8.3.4.
8.5 Noise test
8.5.1 Test conditions
8.5.1.1 Refer to Figure 1 for the layout of the test bench. The transmission output shaft is separated from the loading device and allowed to run without load. 8.5.1.2 Transmission input speed n=niHe. 8.5.1.3 The working oil temperature is greater than 80℃.
8.5.1.4 Use the oil pump provided by the transmission itself to supply oil. 8.5.1.5 The placement of the sound level meter during the test is shown in Figure 2. In Figure 3, A1, A2 and A3 are the three measuring points of the microphone respectively. H is the height of the center line of the transmission input shaft from the ground, which is generally not less than 0.4m. A1 and A2 are located on the same plane at the height of H, and point A3 is above the transmission. L is half of the total length of the transmission, and the vertical distance from each measuring point to the transmission housing is 1m.
8.5.1.6 The installation reference of the transmission on the test bench and the clamping point should be the same as the actual use conditions. 8.5.1.7 The distance between the sound level meter and any reflector shall not be less than 2m. 8.5.2 Test procedure
8.5.2.1 Start the engine and increase the speed to the set value. The transmission output shaft is idling without load. Measure in each working gear in turn. 8.5.2.2 The sound level meter uses the "A" weighting network "fast" gear for measurement. The sound level meter faces the transmission directly, and the incident angle is zero. The reading of the sound level meter is the average value of the needle swing within the cycle. The noise value of the transmission is the maximum value among the measured points. 8.5.2.3 Before (or after) the transmission measurement, the background noise is measured. The transmission is not running, and other conditions are the same. The test method is the same as 8.5.2.2.
8.5.3 If the transmission noise is greater than the background noise by 10dB(A), the background noise is not considered. If the difference between the two is less than 3dB(A), the measurement result is invalid: If the difference between the two is 3~10dB(A), it should be corrected according to Table 3, and the correction value should be subtracted from the measured result. 8.5.4 The measurement results are recorded in Table A3, and the sound level meter positions L and H are noted. A3
Figure 2 Schematic diagram of the placement of the sound level meter
Table 3 Correction value of background noise
Difference between measured noise and background noise
Correction value
Test data processing and test report
Transmission input and output power P, P (kW): 9.1.1 Torque converter speed ratio itB:
Transmission transmission efficiency n:
9.2 Processing of original measurement data
9.2.1 Calculate the arithmetic mean X of each measurement parameter: N
Parameter value for each measurement;
Where: X-
Number of parameter values.
T,n2元
nziF(R)
(i=l, 2,3....N)
JB/T9720-2001
9.2.2 Find the residual error U corresponding to each measurement value X,: U =X,-x
9.2.3 Find the mean square error of the measured values:
9.2.4 Find the limiting error 4:
Where: α——significance level;
N—number of measurements;
(i-1, 2, 3.*.N)
4=x(α,Nα
The maximum deviation allowed by the Grubbs criterion with a confidence probability of 0.95 (obtained from the table). (6)
(8)
9.2.5 If there is a value greater than the limit error 4 in the residual error U., it should be regarded as a gross measurement error and eliminated. Recalculate the arithmetic mean according to 9.2.1.
9.3 Record the arithmetic mean of each measured parameter and its calculation results in the test summary table, see Table A4. The content of the test summary table can be adjusted according to the purpose of the test report.
9.4 Test curve
9.4.1 When a set of test data is graphically displayed, the horizontal axis represents the independent variable and the vertical axis represents the dependent variable. The proportion used should accurately represent the effective value of each parameter. The curve should be continuous, uniform and smooth. . 9.4.2 The curve should indicate the test conditions (such as n=constant or T=constant) and the gear to which the curve belongs. Examples of test curves are shown in Figures B1 to B5 in Appendix B (Suggested Appendix).
9.5 Test report
A test report should be written after the test is completed. The report content includes the following items: a) Introduction, including test time, test location, test piece model and main technical data, factory year and month, manufacturer name: b) Test purpose:
c) Specifications and models of test equipment and instruments: d) Test preparation:
e) Test items and test methods:
f) Test results, including problems encountered during the test and their handling, with test data, calculation results and test curves attached: g) Test accuracy analysis;
h) Test conclusions and suggestions.
Input speed
Shift gear
Output speed
JB/T9720-2001
Appendix A
(Suggested appendix)
Transmission test record
Transmission shift process and working oil pressure test record Inlet oil pressure
Outlet oil pressure
Lubricating oil pressure
Main oil circuit oil pressure
Clutch oil pressure
Note: t-depressurization time: 12-oil filling time: 1-total shift time: T-peak torque. Table A2 Transmission operating force measurement record
Tested valve name and gear range
Measured value
Inlet oil temperature
Working oil flow
Shift torque
Distance between force application point and valve axis center
Transmission efficiency n:
9.2 Processing of original measurement data
9.2.1 Calculate the arithmetic mean value X of each measurement parameter: N
Parameter value of each measurement;
Where: X-
N number of parameter values.
T,n2 yuan
nziF(R)
(i=l, 2,3....N)
JB/T9720-2001
9.2.2 Calculate the residual error U corresponding to each measurement value X,: U =X,-x
9.2.3 Calculate the mean square error of the measurement value:
9.2.4 Calculate the limit error 4:
Where: α——significance level;
N—number of measurements;
(i-1, 2, 3.*.N)
4=x(α,Nα
The maximum deviation allowed by the Grubbs criterion with a confidence probability of 0.95 (obtained from the table). (6)
(8)
9.2.5 If there is a value greater than the limit error 4 in the residual error U., it should be regarded as a gross measurement error and eliminated. Recalculate the arithmetic mean according to 9.2.1.
9.3 Record the arithmetic mean of each measured parameter and its calculation results in the test summary table, see Table A4. The content of the test summary table can be adjusted according to the purpose of the test report.
9.4 Test curve
9.4.1 When a set of test data is graphically displayed, the horizontal axis represents the independent variable and the vertical axis represents the dependent variable. The proportion used should accurately represent the effective value of each parameter. The curve should be continuous, uniform and smooth. . 9.4.2 The curve should indicate the test conditions (such as n=constant or T=constant) and the gear to which the curve belongs. Examples of test curves are shown in Figures B1 to B5 in Appendix B (Suggested Appendix).
9.5 Test report
A test report should be written after the test is completed. The report content includes the following items: a) Introduction, including test time, test location, test piece model and main technical data, factory year and month, manufacturer name: b) Test purpose:
c) Specifications and models of test equipment and instruments: d) Test preparation:
e) Test items and test methods:
f) Test results, including problems encountered during the test and their handling, with test data, calculation results and test curves attached: g) Test accuracy analysis;
h) Test conclusions and suggestions.
Input speed
Shift gear
Output speed
JB/T9720-2001
Appendix A
(Suggested appendix)
Transmission test record
Transmission shift process and working oil pressure test record Inlet oil pressure
Outlet oil pressure
Lubricating oil pressure
Main oil circuit oil pressure
Clutch oil pressure
Note: t-depressurization time: 12-oil filling time: 1-total shift time: T-peak torque. Table A2 Transmission operating force measurement record
Tested valve name and gear range
Measured value
Inlet oil temperature
Working oil flow
Shift torque
Distance between force application point and valve axis center
Transmission efficiency n:
9.2 Processing of original measurement data
9.2.1 Calculate the arithmetic mean value X of each measurement parameter: N
Parameter value of each measurement;
Where: X-
N number of parameter values.
T,n2 yuan
nziF(R)
(i=l, 2,3....N)
JB/T9720-2001
9.2.2 Calculate the residual error U corresponding to each measurement value X,: U =X,-x
9.2.3 Calculate the mean square error of the measurement value:
9.2.4 Calculate the limit error 4:
Where: α——significance level;
N—number of measurements;
(i-1, 2, 3.*.N)
4=x(α,Nα
The maximum deviation allowed by the Grubbs criterion with a confidence probability of 0.95 (obtained from the table). (6)
(8)
9.2.5 If there is a value greater than the limit error 4 in the residual error U., it should be regarded as a gross measurement error and eliminated. Recalculate the arithmetic mean according to 9.2.1.
9.3 Record the arithmetic mean of each measured parameter and its calculation results in the test summary table, see Table A4. The content of the test summary table can be adjusted according to the purpose of the test report.
9.4 Test curve
9.4.1 When a set of test data is graphically displayed, the horizontal axis represents the independent variable and the vertical axis represents the dependent variable. The proportion used should accurately represent the effective value of each parameter. The curve should be continuous, uniform and smooth. . 9.4.2 The curve should indicate the test conditions (such as n=constant or T=constant) and the gear to which the curve belongs. Examples of test curves are shown in Figures B1 to B5 in Appendix B (Suggested Appendix).
9.5 Test report
A test report should be written after the test is completed. The report content includes the following items: a) Introduction, including test time, test location, test piece model and main technical data, factory year and month, manufacturer name: b) Test purpose:
c) Specifications and models of test equipment and instruments: d) Test preparation:
e) Test items and test methods:
f) Test results, including problems encountered during the test and their handling, with test data, calculation results and test curves attached: g) Test accuracy analysis;
h) Test conclusions and suggestions.
Input speed
Shift gear
Output speed
JB/T9720-2001
Appendix A
(Suggested appendix)
Transmission test record
Transmission shift process and working oil pressure test record Inlet oil pressure
Outlet oil pressure
Lubricating oil pressure
Main oil circuit oil pressure
Clutch oil pressure
Note: t-depressurization time: 12-oil filling time: 1-total shift time: T-peak torque. Table A2 Transmission operating force measurement record
Tested valve name and gear range
Measured value
Inlet oil temperature
Working oil flow
Shift torque
Distance between force application point and valve axis center
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