JB/T 6703.1-2000 This standard is a revision of JB/T 6703.1-1999 "Tractor Clutch Bench Test Method". During the revision, test items and methods were added; the durability test specifications were modified. This standard specifies the bench test methods for tractor dry friction clutch assemblies and their components. This standard applies to tractor dry friction clutches, and other agricultural machinery clutches may be implemented as a reference. This standard was first released as NJ 403-86 in 1986, and the standard number was adjusted to JB/T 6703.1-1999 in April 1999. JB/T 6703.1-2000 Tractor clutch bench test method JB/T6703.1-2000 Standard download and decompression password: www.bzxz.net

ICS65.060.10
T63
JB
Machinery Industry Standard of the People's Republic of China
JB/T6703.1-2000
Tractor clutch bench test method| |tt||Theclutchbenchtestmethod
for tractor
Released on 2000-08-31
National Machinery Industry Bureau
Released
Implemented on 2001-01-01| |tt||JB/T6703.1-2000
Foreword
This standard is a revision of B/T6703.1-1999 (formerly NV403-86) "Tractor Clutch Bench Test Method". Compared with JB/T6703.1-1999, the main technical content of this standard has the following changes: 1) Added the assessment of the components of the clutch assembly: 1. Added the performance and durability of the shock absorber of the clutch driven plate assembly Test items and methods; 1. Added test items and methods for the axial compression characteristics and durability of the clutch belt corrugated plate driven plate: 1. Added test items for the load characteristics, separation characteristics and durability of the cover and pressure plate assembly and methods; 1. Since the engine speed of tractors generally increases, in order to improve the rotation reliability of the clutch and eliminate unsafe factors, the clutch rotation strength test items and methods are added. 2) Modified the durability test specifications of the clutch assembly: the original standard for the clutch assembly bench durability test stipulates 6X104 engagements, but does not control the unit sliding work. This method is not reasonable. This revision conducts the engagement-disengagement durability test based on the same unit of sliding work. The number of engagements is 2.5X1 times. The auxiliary clutch is conducted according to the main clutch test items. Common components of the main and auxiliary clutches have been assessed and tested in the main clutch. , the auxiliary clutch is no longer repeated.
Appendix A of this standard is a reminder appendix.
This standard replaces JB/T6703.1-1999 from the date of implementation. This standard is proposed and administered by the National Tractor Standardization Technical Committee. This standard was drafted by: Luoyang Tractor Research Institute. The main drafters of this standard: Luan Xinli, Li Binfeng, Yu Shuo. 1 Scope
Machinery Industry Standard of the People's Republic of China
Tractor clutch bench test method
The clutch bendh test methodfortracton
This standard specifies the tractor dry friction clutch assembly Bench test methods for components and parts thereof. JB/T 6703.1-2000 | | tt | 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. JB/T5184-1991 Tractor flywheel and clutch overspeed test method 3 General principles
3.1 Test items
3.1.1 Clutch control performance test.
3.1.2
3.1.3
Torsional static characteristics and durability test of driven disk assembly shock absorber Axial compression characteristics of driven disk assembly with corrugated plate and durability testing. 3.1.4
Clutch cover, pressure plate assembly performance and durability test, clutch rotation strength test.
3.1.5
Determination of clutch static friction torque.
3.1.6
3.1.7
Clutch starting performance and thermal load performance test. 3.1.8
3.1.9
Thermal degradation performance test of clutch friction plate. Clutch assembly durability test
3.2 Test preparation
3.2.1 Installation of thermocouple
The thermocouple is installed on the friction plate that is severely heated and has a small heat capacity to rub against the mating parts. On the friction surface at the middle diameter (it is allowed to use infrared thermometry to measure the surface temperature).
3.2.2 Check whether the driven disk assembly is loose everywhere. 3.2.3 Measure the thickness at the friction center diameter of the driven disk assembly (each piece is four evenly distributed points). 3.2.4 Measure the pressing force Pv
of the clutch. Fix the sample on the flywheel or special fixture. The pressure acts vertically and evenly on the friction surface of the pressure plate. Measure the pressing force P under working condition. , (it is allowed to separately measure the force of the pressing element in the actual working state for synthesis, with an accuracy of not less than 3%). 3.2.5 Adjust the position of the separation lever according to the drawing requirements. State Machinery Industry Bureau approved on 2000-08-31 for implementation on 2001-01-01
1
3.2.6 Running-in of specimens
JB/T6703.1-2000||tt| |3.2.6.1 The friction pair is composed of the original pair of matching parts for running-in. 3.2.6.2 The friction surface temperature shall not exceed 150°C. 3.2.6.3 After running-in, the contact area should be close to the friction middle diameter by visual inspection, and the contact area should reach more than 80%. 3.2.6.4 Do not be contaminated with oil or use any abrasives during running-in. No cleaning is allowed after running-in (before performance testing). 3.2.7 Various instruments and equipment used in the test should have certificates or calibration records inspected by the relevant departments. 3.3 Test load
3.3.1 Main shaft speed
The main shaft speed of the main and auxiliary clutches is determined according to 75% of the calibrated speed of the original engine of the sample 3.3.2 The moment of inertia on the driven shaft of the test bench 3.3.2.1 The main clutch is in the lowest transport gear (wheeled tractors are closest to 14km/h, walking tractors and crawler tractors are closest to 7km/h) under full load field starting conditions, and the total mass of the unit is converted to the equivalent inertia on the clutch shaft and is determined according to Equation (1) : Quantity = mp
Suppose
In the formula: K—
-equivalent inertia of the tractor K gear, kg·m?; the mass of the tractor unit (take 3 of the minimum mass of the tractor times), kg; m
R—the rolling radius of the tractor drive wheel, m; ik
—the transmission ratio from wheel to clutch in K gear. 3.3.2.2 The auxiliary clutch is 80% of the inertia of the main clutch. 3.3.3 The road resistance torque on the driven shaft of the test bench 1. The main clutch is determined according to the field resistance torque of the lowest transport gear and full load field starting condition according to formula (2): 3.3. 3.1
mgfR,
M,=
ik
where: Mr tractor's resistance torque at field start-up operation, N·m; g gravity acceleration, is 9.8m/s;
Rr The rolling radius of the tractor drive wheel, m
factory-one rolling resistance coefficient, takes 0.1 for wheeled tractors and 0.12 for crawler tractors. 3.3.3.2 The auxiliary clutch does not need to be added resistance torque. 4 Clutch control performance test
Measurement items
4.1
a) Control force on the pedal:
b) Pedal stroke, pressure plate stroke;
Check the clutch for completeness of disengagement.
4.2 Test conditions
4.2.1 Test temperature: room temperature.
4.2.2 The specimen shall not be run-in before the operation test. The operating mechanism and separation mechanism should be installed and adjusted according to the drawing requirements. 4.2.3
2
(1)
(2)
4.3 Test equipment
Controlling performance test bench.
4.4 Test method
JB/T6703.1-2000
4.4.1 Install the sample on the test bench, and adjust the position of the operating mechanism and separation lever according to the drawing requirements. 4.4.2 Determine the static characteristics of the control mechanism
Slowly step (pull) down the pedal (handle), and measure the control force on the pedal (handle), pedal (handle) stroke and pressure plate stroke of the main and auxiliary clutches respectively. , repeat five times, and draw the static characteristic curve based on the average value. For double-acting clutches where the main and auxiliary clutches are operated separately, the pedal (handle) operating force and stroke of the main and auxiliary clutches when separated should be measured. Figure 1. Sao use
Fine board management
a) Diaphragm spring
4.4.3 Check the completeness of clutch separation
Figure 1
4.4.3.1 Step (pull) down the pedal (handle) to the maximum stroke and measure the separation gap. Anti-stroke products
b) Coil spring
4.4.3.2 Step (pull) the pedal (handle) to the maximum stroke, turn either end of the main and driven shafts, and see if the other end is dragged If it is dragged while rotating, measure the friction torque of the clutch. 4.5 Test report and data compilation
Compile the report according to the test data and recorded curves recorded in Table A1 of Appendix A (suggested appendix). 5 Torsional static characteristics and durability test of driven disc assembly shock absorber Torsional static characteristics measurement test of driven disc assembly shock absorber 5.1
5.1.1 Measurement items
a) Limit torque Mmuaxi
b) Limit rotation angle max;
c) Damping torque Mro
5.1.2 Test conditions
5.1.2.1 Test load: Torsional static characteristics test is loaded to the limit rotation angle of the shock absorber (positive and negative directions). 2 Test temperature: room temperature.
5.1.2.2
3
5.1.3Test equipment
JB/T6703.1-2000
Clutch driven plate assembly shock absorber test bench, see Figure 2. E
1-Motor: 2-Vibrator: 3-Torque sensor: 4-Angular displacement sensor: 5-Clamping mechanism: 6-Clutch driven plate Figure 2
5.1.4Test method
5.1.4.1Install the specimen on the spline shaft that is suitable for it, and fasten the outer edge of the specimen to the test bench. 2Preload the specimen to the limit pin five times in both the positive and negative directions, and then adjust the instrument to zero. 5.1.4.2
5.1.4.3
Load the specimen to the limit pin in one direction. Unload to zero.
5.1. 4.4
Reverse load the specimen to the limit pin.
5.1. 4.5
5. 1. 4. 6
Unload to zero.
Measure the limit torque, damping torque and limit rotation angle, and draw the torsional static characteristic curve, as shown in Figure 3. M
Ma a
Men o
0
中
3. =Corresponding to the maximum torque point of the engine: 9m = limit angle; Mx = limit torque; Max = corresponding to the maximum torque of the engine; M = friction damping torque Figure 3
5.2 Torsional durability test of driven disc assembly M5.2.1 Measurement items
a) Limit torque Mnuax:
b) Limit angle max*
c Damping torque Mr:bzxZ.net
① Spline wear.
4
5.2.2 Test conditions
JB/T6703.1-2000
5.2.2.1 Test load: The test load is a unidirectional pulsating load, and the loading torque is 10% to 100% of the maximum torque of the engine. It can also be loaded according to the corresponding angle corresponding to the above load.
5.2.2.2 Torsional frequency: 500~600 times/min. 5.2.2.3 Test temperature: room temperature.
5.2.3 Test equipment
Clutch driven disc assembly shock absorber test bench. 5.2.4 Test method
Measure the spline size.
5.2. 4.1
5. 2. 4. 2
Install the sample, fasten the outer edge of the sample to the test bench, and measure the forward initial torsional static characteristics according to 5.1.4. Use a vibration exciter (or other mechanism) to load back and forth, and record the torque, angle, and number of loadings. 5.2.4.3
4 Intermediate inspection: After the specified number of times, measure the static characteristics, check the damage of each component, looseness of the spring, etc. 5.2. 4. 4
Note: The specified number of times is: 25×10%, 50×10, 75×10, 100×105.2.4.5 After the test, remove the sample, check the damage of each component, and measure the wear of the spline. 5.3 Test report and data compilation
Compile the report according to the test data recorded in Table A2 of Appendix A. 6
Axial compression characteristics and durability test of driven disc assembly with corrugated plate 6.1 Axial compression characteristics test of driven disc assembly 6.1.1 Measurement items
a) Clutch clamping force P (see 3.2.4)
b) Axial compression amount 6%.
6.1.2 Test conditions
6.1.2.1 Test temperature: room temperature.
6.1.2.2 The maximum load of the test is the clamping force of the clutch in the working clamping state. 6.1.3 Test equipment
A reference diagram of the axial compression characteristics test bench and the corresponding instrumentation device to ensure that the load acts vertically and evenly on the friction surface of the driven disc assembly is shown in Figure 4.
6.1.4 Test method
6.1.4.1 Install the test specimen on the test bench, and the device status is shown in Figure 4. 3
2
4
1-Main frame; 2-Displacement sensor; 3-Preload plate; 4-Driven plate assembly; 5-Lower pad Figure 4
5
JB/T6703.1-2000
6.1.4.2 Compress the driven plate assembly several times according to the clutch clamping force until the axial compression reading is stable, and then start measuring. 6.1.4.3 Slowly load the driven plate assembly until the load on the driven plate assembly reaches the specified clutch clamping force P, and record the axial compression S and the corresponding clamping force P.
6.1.4.4 When the specified clutch clamping force is reached, measure the distance between the upper and lower clamping plates at four points evenly distributed along the circumference. The average value is the clamping thickness of the driven plate assembly. The difference between the maximum and minimum values ??is the parallelism. 6.1.4.5 Reduce the load in the same way until the load is unloaded to zero, and record the axial compression 8 and the corresponding clutch clamping force P. 6.1.4.6 Draw the axial compression characteristic curve as shown in Figure 5, indicating the axial compression 8%. z
P
P.
f rum
Figure 5
6.2 Driven plate assembly axial compression durability test 6.2.1 Measurement items
a) Clutch clamping force P see 3.2.4);
b) Axial compression 8,.
6.2.2 Test conditions
6.2.2.1 Test temperature: room temperature.
6.2.2.2 Axial load: reciprocating cycle from zero to maximum load, the maximum load is equal to the working clamping force of the cover and pressure plate assembly used with the driven plate assembly under test.
6.2.2.3 Reciprocating frequency: 150~200 times per minute. 6.2.3 Test equipment and auxiliary devices
The reciprocating stroke is adjustable within the range of 0~20mm and meets the requirements of 6.2.2. The device reference diagram is shown in Figure 6. 5
4
3
1
1 A stand; 2 A driven disc assembly: 3 A cover, a pressure plate assembly; 4 A first generation release bearing; 5 A sliding shaft Figure 6
6
6.2.4 Test method
JB/T6703.1-2000
6.2.4.1 Measure the axial compression characteristics of the driven disc assembly according to 61 and determine the axial compression amount before the test by 9. 6.2.4.2 Install the driven disc assembly to be tested on the test bench and adjust the test bench to meet the requirements of 6.22. 6.2.4.3 Start the test bench to disengage and engage the clutch and reciprocate for 25×10 times. 6.2.4.4 Remove the sample, measure the axial compression characteristics of the driven plate assembly according to 61, and determine the axial compression amount S after the test according to P6.2.4.5 Remove the friction lining rivets when necessary, remove the friction lining, and check the damage of the corrugated plate and friction lining. 6.3 Test report and data compilation
Compile the report according to the test data and recorded curves recorded in Table A3 of Appendix A. 7 Performance and durability test of clutch cover and pressure plate assembly 7.1 Separation characteristic and load characteristic measurement test of cover and pressure plate assembly 7.1.1 Test equipment and instruments
Measuring fixtures of platform, cover and pressure plate assembly (the size of the fixture seat is the same as the flywheel matched with the sample), height gauge, feeler gauge, dial indicator, force and displacement sensor, dynamic strain gauge, and recorder. Refer to Figures 7 and 8 for the device. 7.1.2 Separation characteristics
7.1.2.1 Measurement items
a) Separation force Pr, Pinx;
b) Maximum separation stroke ^:;
Pressure plate displacement h;
d) Pressure plate inclination △h.
7.1.2.2 Test conditions
Test temperature: room temperature.
7.1.2.3 Test method
7.1.2.3.1 Fix the cover and pressure plate assembly to the substitute flywheel as required, with a spacer equivalent to the clamping thickness of the driven plate assembly in the middle. 7.1.2.3.2Place this device in the center of the measuring platform, as shown in Figure 7. 12
3
4
5
16
1 - Measuring table; 2 Digit indicator; 3 - Pad; 4 - Load measurement Device; 5-generation release bearing; 6-generation flywheel Figure 7
7
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