Some standard content:
ICS 65.060.10
Machinery Industry Standard of the People's Republic of China
JB/T8299-1999
Determination of tractor transmission efficiency
Determination of tractor transmission efficiencyPublished on August 6, 1999
State Bureau of Machinery Industry
Implementation on January 1, 2000
JE/T8299-1999
This standard is a revision of JB/T829995 (formerly 0B10918-89) Determination of tractor transmission efficiency. Compared with JB/8299--95, this standard has some changes in the following major technical contents: The test load of the transmission system of four-wheel drive tractors is coordinated with relevant standards and expressed by formulas. This standard replaces JB/T829995 from the date of implementation. Appendix A of this standard is a reminder appendix.
This standard is proposed and managed by the Jinguo Tractor Standardization Technical Committee. The drafting unit of this standard is: Qiyang Tractor Research Institute. The main drafters of this standard are: Yu Ruixi, Kong Weigong, Tang Yuwen. 1 Scope
Machinery Industry Standard of the People's Republic of China
Determination of tractor transmission efficiency
Deterrinatdan of tractor trasnmisslonetmlciencyJE/8299—1999
Recommended IB/829995
This standard specifies the method for determining the transmission efficiency of tractor transmission system (earth transmission system and power auxiliary shaft transmission system) under idling power loss and load
This standard is applicable to the mechanical transmission system of tractors. The transmission efficiency of components in the transmission system can be determined in accordance with this standard. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through their use in this standard. At the time of publication of this standard, all versions are valid: All standards are officially recognized. Parties using this standard should explore the possibility of using the latest version of the following standards.GH/ T2979—1991 Agricultural tire series
GB/T3871—1993 Test methods for agricultural wheeled and belted tractorsB/T6229—1995 Test methods for hand-held tractors3 Test items for determining the efficiency of the transmission system
3.1 Requirements for the transmission system to be tested
3.1.1 The transmission system to be tested shall comply with the assembly requirements and use the lubricating oil of the specified brand in the tractor manual or relevant technical documents. The oil level shall be the median value of the normal oil level. 3.1.2 The transmission system to be tested shall be tested in accordance with the requirements of GB/T3871 or GR6299. The oil temperature shall be the normal oil temperature specified in the relevant technical documents. If there is no requirement, the oil temperature shall be ±3°C. 3. 2 Test equipment
3.2.1 Indoor open transmission test bench, and there should be a leakage control device. 3.2.2 The power excitation of the test bench is a connectable DC motor, or other power device. 3.2.3 If the test bench has an extension or speed device, the input and output torque-speed sensors should be connected between the input shaft and output shaft of the transmission system and this device. If the torque-speed sensor is rigidly connected to the test bench or transmission system, the coaxial angle should not be greater than 0.05mm; 3.3 Test table
3.3.1 The comprehensive accuracy of the torque-speed sensor used in the test and the secondary instrument is: torque is = 0.5%, and speed is ±0. 1%3.3.2 The accuracy of the temperature measuring instrument is ±1.
3.3.3 All instruments must be calibrated or corrected before testing. 4 Test records and reports
4.1 The test data shall be at least the integrated average value within 30s, or at least the arithmetic half-mean of 3 readings: 4.2 According to the test items, the contents specified in Table A1, Table A2 and Table A3 in Appendix A (Suggested Appendix) shall be recorded respectively: Caojia Machinery Industry Kitchen 1999-0B-06 Approved 2000-0)-01 Implementation
JB/T8299—1999
4.3 A report shall be prepared after the test, and the report shall include Including the following contents: a) The manufacturer entrusted with the test:
b) The model and torque of the transmission system under test;
c) Match the engine's calibrated speed and torque;
d) The manufacturer entrusted with the test's requirements for the test;
e) The test results should include the evaluation values of each test result and the test records based on them:
test number, test date and the signature of the test undertaking unit; 5 Determination of idling power loss
5.1 Test method
) The transmission system under test is not connected, and at the engine's calibrated speed and the corresponding standard speed at the power output shaft end, the additional rotating bottle connected with the grass is tested:
b) Connect the tested The transmission system, gearbox and power output shaft are all in the neutral position. Under the engine's rated speed, measure the idling torque: s) Lock the differential, record the power output shaft in the neutral and engaged positions, and at the engine's rated speed, perform an idling test on each forward gear of the gearbox and record the idling torque:
) The gearbox is in the neutral position, at the engine's rated speed and at the power output shaft's standard speed, perform an idling test and record the idling torque
5.2 Idling power loss calculation
Calculate the loss coefficient P according to formula (1):
Where: Zi—input torque, N·m;
P-, -Zeom
【kw】
TAdditional torque of the coupling at the corresponding speed, N·mn——input speed. r/min.
5.3 Assessment of idling power loss
The arithmetic mean of the idling power losses of each forward gear [excluding neutral gear] at the rated engine speed can be used as the assessment value of the idling power loss of the transmission system and calculated according to formula (2): R-!zP.
Wherein:
Pr-the idling power loss of the first gear at the rated higher engine speed, kw: - gear number.
6 Determination of transmission efficiency of main drive system
6.1 Test method
6.1.1 Test load
a) For rear-wheel drive tractors, with and without tractors, the torque T of the driving wheel calculated according to the rated torque of the engine I and the torque T of the attached wheel calculated according to the bearing capacity of the tractor tire (or the vertical force of the belt), that is, formula [3], formula (4, the smaller value is the load efficiency of the loading system under the test load. The load efficiency should not be greater than %, and the average load efficiency should not be greater than 1%. 2
JB/T8299-1999
Tru = T., fg.
T+=2GFrd
Where: center - the transmission ratio of the weak drive wheel from the engine (3)
is the typical value of the transmission efficiency of the transmission system. Among them, the gear cutting uses the following empirical values: the center of the conventional gear is .98; the drivable gear is 1.97 and the planetary gear is 0.96;
G - the load capacity of a driving wheel is the load capacity when the internal pressure is 0.1MPa, which can be obtained in GBT2979) or the vertical effect of the belt on the ground, M: 7 - the half of the driving wheel power, the tire is based on the nominal size multiplied by 0.935: the belt is based on the radius of the driving wheel. m; the variable coefficient is micro, for wheeled tractors, take 065; for belt tractors, take 10. 6) For four-wheel drive throwers, the front: rear driving wheel torque TeT calculated according to the rated engine torque and the load-bearing capacity of the front and rear drive wheels is used as the test load, see formula (5). Formula (6): Gr FF
【Gy-GrR
Ix -I, in G. +Gs
Where: The first gear transmission ratio from the engine to the rear drive wheel: Gr, G are the load-bearing capacities of the front and rear tires, N, - are the power radii of the front and rear wheels, m: ep
TMI, 7Me are the calculated transmission efficiencies of a certain gear from the engine to the front and rear drive wheels, respectively. Method: The values in each code are shown in the relevant derivatives of formula (3) and formula (4). For the gear with theoretical speed lower than 7km/h, the front and rear wheel rotations of the gear closest to 7km/h are used as the test gear. 6.1.2 The input speed is the rated speed of the engine. -(5)
6.1.3 Lock the differential lock, put the power output shaft in the neutral position, start from the highest gear, and perform a loading test for each front gear (excluding creeping sweep), and record the input and output speeds and torque. .2 Calculation of transmission efficiency
62.1 Calculate the input power according to formula (7): Where: T--input wheel torque, Nm;
PaZin - Tea Jaia
Additional torque of the coupling device at the corresponding input speed, N·Tm: input speed, Timi,
6.2.2 Calculate the output power P
Pau. =T n +T, n, +T n, +T, n.9549.3
Formula: , tI is the output torque of the left front and rear drive axles, N·m; m
is the output speed of the left reverse shear and rear worm gear axles, T/min; TrI is the output torque of the right front and rear drive axles, N·m; m— is the output speed of the right front and rear worm gear axles, mi. 6.2.3 Calculate the transmission efficiency of the first gear according to formula (9)
: The percentage value is rounded to one decimal place. 6.3 Evaluation of transmission efficiency
JB/T8299—1999
Under the specified working conditions, the transmission efficiency of the forward gear (excluding the running gear) with the weighted time distribution coefficient can be taken as the evaluation value of the transmission efficiency of the transmission system and calculated according to formula (10): -,n
Wherein, \ - the number of forward gears under test
distribution: - the first gear of the transmission system under test! Calculation of the power output shaft transmission efficiency.
7.1 Test method
a) Take the power output shaft end torque corresponding to the engine rated torque as the test load: (10)
b) Connect to the transmission system and carry out a loading test with the engine rated speed as the input speed as required by item a), and record the output speed and torque
) Carry out a loading test at the standard speed corresponding to the power output shaft end as required by item a), and record the input and output speeds and torque:
If the power output shaft has multiple speeds, repeat the test for each speed. 7.2 Calculation of transmission efficiency
) Calculate the input and output power P, P according to formula (11) and formula (12): R. -i-nn (kw)
Where; T, Tu
Input, output torque, N·m
Tar He
T. Additional torque of the coupling device at the corresponding input speed, N·m; Hu Input, output speed, rimin.
) Calculate the transmission efficiency of the first gear under the load of the power cat output shaft u according to formula (13): rron
To:. The decimal places are rounded to one decimal place. 7.3 Evaluation of transmission efficiency under load of power output shaft Pa
·(12)
When the power output shaft is loaded, the average value of the transmission efficiency at each speed of the power output shaft at the power output shaft end or the corresponding rated speed of the engine can be taken as the evaluation value of the power output shaft efficiency. According to formula (14), the power output shaft speed is equal to the power output shaft speed number. The transmission system type is based on the power output shaft speed. Engine calibration method
Lubricating oil brand
Test bench model
Test plan
Test points
Control data
Test test type
Test shaft type
JB/T82991599
Appendix A
[Reminder Appendix]
Recording format
Table A1: Transmission system idling power loss measurement record Test record number
Change
Power shaft output standard speed
Tester responsible for adjustmentwwW.bzxz.Net
Ambient temperature
Design
Pressure
Lubrication
Oil pressure
Transmission gear
Transmission control
Idle power loss switch
Power output shaft press or not [hot rotation)
Power output shaft report "No [press transmission) B/8299-1999
++++++
Yuhao Road
Hui Renming
Transmission horse model
Matching engine calibration speed
Standard speed of small output shaft
Quick-action system lubricating oil brand
Test bench model
Test code
JB8299-1999
Table A3 Transmission efficiency measurement record under power output shaft load
Calibrated torque
Test person in charge's name
N·emn Nn
Test input speed type
Test structure transfer type
Input station single
(TF)n
Speed change cat elimination
Silicon box blocking
Drag power
Environmental treatment
Infection efficiency
Power output extraction speed
Power output shaft transfer speed3 Evaluation of transmission efficiency under load of power output shaft Pa
·(12)
When the power output shaft is loaded, the average value of the transmission efficiency at each speed of the power output shaft at the power output shaft end or the corresponding rated speed of the engine can be taken as the evaluation value of the power output shaft efficiency. According to formula (14! Calculate: re
Where: The power output shaft speed is equal to the power output shaft speed number
The transmission system type is matched according to the power output shaft speed. Engine calibration method
Lubricating oil brand
Test bench model
Test plan
Test points
Control data
Test test type
Test shaft type
JB/T82991599
Appendix A
[Reminder Appendix]
Recording format
Table A1: Transmission system idling power loss measurement record Test record number
Changed
Standard speed of power shaft output
Tester responsible for adjustment
Environmental temperature
Calculation
Pressure
Lubrication
Oil pressure
Transmission gear
Transmission control
Idle power loss switch
Whether the power output shaft is pressed or not [hot rotation)
Power output shaft report "No [press transmission) B/8299-1999
++++++| |tt||Yuhao Road
Hui Renming
Transmission horse model
Matching engine calibration speed
Standard speed of small output shaft
Quick-action system lubricating oil brand
Test bench model
Test code
JB8299-1999
Table A3 Transmission efficiency measurement record under power output shaft load
Calibrated torque
Test person in charge's name
N·emn Nn
Test input speed type
Test structure transfer type
Input station single
(TF)n
Speed change cat elimination
Silicon box blocking
Drag power
Environmental treatment
Infection efficiency
Power output extraction speed
Power output shaft transfer speed3 Evaluation of transmission efficiency under load of power output shaft Pa
·(12)
When the power output shaft is loaded, the average value of the transmission efficiency at each speed of the power output shaft at the power output shaft end or the corresponding rated speed of the engine can be taken as the evaluation value of the power output shaft efficiency. According to formula (14! Calculate: re
Where: The power output shaft speed is equal to the power output shaft speed number
The transmission system type is matched according to the power output shaft speed. Engine calibration method
Lubricating oil brand
Test bench model
Test plan
Test points
Control data
Test test type
Test shaft type
JB/T82991599
Appendix A
[Reminder Appendix]
Recording format
Table A1: Transmission system idling power loss measurement record Test record number
Changed
Standard speed of power shaft output
Tester responsible for adjustment
Environmental temperature
Calculation
Pressure
Lubrication
Oil pressure
Transmission gear
Transmission control
Idle running damage switch
Power output shaft whether it is pressed or not [hot running)
Power output shaft report "No [pressing) B/8299-1999
++++++| |tt||Yuhao Road
Hui Renming
Transmission horse model
Matching engine calibration speed
Standard speed of small output shaft
Quick-action system lubricating oil brand
Test bench model
Test code
JB8299-1999
Table A3 Transmission efficiency measurement record under power output shaft load
Calibrated torque
Test person in charge's name
N·emn Nn
Test input speed type
Test structure transfer type
Input station single
(TF)n
Speed change cat elimination
Silicon box blocking
Drag power
Environmental treatment
Infection efficiency
Power output extraction speed
Power output shaft transfer speed
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