This standard specifies the bench test method for mechanical steering gears of tractors. This standard applies to mechanical steering gears such as worm roller type, recirculating ball type, crank pin type and worm gear type (hereinafter referred to as steering gears). JB/T 8404.2-1996 Bench test method for mechanical steering gears of tractors JB/T8404.2-1996 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 8404.2-96
Mechanical Steering Gear of Tractor
Bench Test Method
Published on September 3, 1996
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1997
JD/T 404.2
This standard is a revision of V382-85 "Bench Test Method for Mechanical Steering Gear of Tractor". After revision, the relevant technical contents are coordinated with the relevant provisions of JB/T7279-93 Test Method for Rotary System of Wheeled Tractors, and other issues in the standard are also revised. This standard is used in conjunction with JB/T8404.1-96 Technical Conditions for Rotary Gear of Tractors. From the beginning of this standard, Appendix A of the technical standard N382-85 is a reminder appendix.
This standard is proposed by the National Technical Committee for Standardization of Tractor Machinery and the drafting unit of this standard is Luyang Tractor Machinery Research Institute. The main drafters of this standard are Si Xinsheng and Pai Cheng. 1 Scope
Machinery Industry Standard of the People's Republic of China
Tractor Machinery Steering Gear
Bench Test Method
This standard specifies the bench test method for tractor machinery steering gear. JD/T 8404.296
This standard applies to the mechanical steering devices such as snail roller type, adjustable ring type crank pin type and weak ring type (hereinafter referred to as steering devices). 1 General provisions
2.1 This standard includes the following three tests:
a) performance test;
b) stress test:
r) stress test,
2.2 During the test, the steering weight of the ball pin is small, depending on the allowable value or the effective formula (1) P=G×0.×μX/W/8-2
weight of the ball pin.
Front draw V
Steel arm width m:
- Front wheel width, mim
and the rate of rotation of the tire, is calculated as =CT; steering arm length, nim.
2.3 Before the steering gear is tested, it should be run-in according to the following working conditions: a) The wax should be added to the steering gear at least 10 times under the full rotation angle; b) The number of cycles should not be less than 175 times; c) After running-in, the lubricant should be changed. 3.+ Special steering gear performance test + lubrication should be carried out on multiple parts specified in the design. 2.5 For steering gears with special requirements, the relevant departments can make supplementary provisions on this basis. 2.6 Test results Fill in and draw the guide curve according to the format specified in Appendix VIII (Appendix>), and write a test report. 3 Performance test
3.1 Test objectives
a! Human transformation
b) Single transmission ratio performance!
e) Transmission ratio characteristics:
Mountain transmission efficiency characteristics:
Approved by the Ministry of Machinery Industry on September 3, 1996
Implemented on July 1, 1997
e) No-load rotation resistance
f) Characteristics,
3.2 Determination of full rotation angle of input shaft
IB/T 8404. 2 .- 06
Rotate the input shaft from one extreme position to the other, and measure the degree of rotation. Record the test data. 3.3 Determination of angular transmission ratio characteristics
3.3. Angular transmission ratio is calculated according to formula 12):
where:
Input auxiliary rotation angle increment, (\)
6--increment of the shaft rotation,).
3.3.2 Measurement conditions
The measurement range shall not be less than 9% of the full rotation angle of the single shaft. b) The reduction angle of the shaft shall not be greater than 20°;) It shall be measured under the condition of eliminating the torque converter. 3.3.3 Measurement method
Measure the steering shaft angle under the condition of applying 10N·m torque converter to the shaft. Take the reduction angle formula (2> to calculate the transmission ratio. The difference between the measured and measured shaft angles shall not be greater than 5. The shaft angle of the vertical shaft shall not be greater than 1.5. The measurement and calculation results shall be given in the format of Table A2 and Table A1. 3.4 Determination of dynamic clearance characteristics
3.4.1 Determination conditions
a) The standard deviation of the full rotation angle of the shaft is 90°; b) The data sampling interval is +20°.
3.4.2 Determination method
After the input shaft is rotated to a certain degree, it is fixed and a torque of 10Nm is applied to the vertical arm. The corresponding rotation angle of the vertical arm shaft is within the error of the above. The test results are given in the format of Table 3 and Figure A2: 3. Determination of transmission efficiency characteristics
35.1 The transmission efficiency is calculated according to formula 3), or (1!.M
In the formula: - represents the positive efficiency of the steering gear; represents the output torque of the steering gear, NH; M..
represents the input torque of the input shaft, N·口: —— Angle transmission ratio
3.5.2 Fixed parts
) The test load is 40% of the force at the vertical obstacle: b) The input shaft is not too light"/min;
The result is that the energy of the point is not greater than 2G:
The rotation angle range of the input shaft is not less than 10% of the total rotation
3.5.3 Determination method
The input shaft is linked, and the load finger is placed on the weight replacement pin. The input rotation of the auxiliary shaft and the output torque of the vertical auxiliary shaft are measured. The two corresponding parts are replaced by the formula (2
JB/F8404.2·96
, and the forward efficiency is obtained. Conversely, the vertical shaft is driven, and the vertical auxiliary shaft is measured on the input shaft. The output torque W of the vertical auxiliary shaft is replaced by the formula (4) to obtain the reverse efficiency. The error of the rotation is 10%. The measurement results are given in the format of Table 43.
3.6 Determination of no-load rotational resistance torque
3.6, Measurement conditions
8) The shaft is no-load:
: b) The input shaft speed is not greater than 10r/mir; c) The rotation angle between the input shaft and the input shaft is not less than 10°. 3.6.2 Determination method
The shaft must be moved and the torque at different rotation angles must be measured. The measurement error should not exceed 5%. The measurement results should be in the format of Table A5. 3.7 Determination of rigidity
3.7.1 Calculation of degree of rotation Formula 5) Formula (6)
C. -[.Tu = Ti., Tet = Tn /2 × 57.a2
u-TT/eJ x s7.3
Small rotation angle, V·m/ad;
—No rotation angle torsion angle, N·n/ral:
Input the torque value when the left and right rotation angles are 0°, N, T...Ter
1.T--Enter the torque value when the right and left rotation angles are 2°, N+mT.,T--Enter the torque value when the left and right rotation angles are 10°, N·m; TTa.--Enter the torque value when the left and right rotation angles are 15°, N·m.3. 7. 2 Measurement conditions
a) The weight is fixed at the middle position:
b) The input shaft rotates. When measuring G, the speed should be 0.51/min. When measuring G, the speed should not be higher than 2,/min.3. 7. 3 Determination method
a) Determination (for, with the arm fixed, after eliminating the clearance, turn the input shaft to 5° left and return to the neutral position, then turn the input shaft to 5° right and return to the middle position, and measure the corresponding torque value of the input shaft each time when turning right, and substitute the torque value at 2.5" and C.5° into formula (5) to calculate the stiffness center. The measurement error shall not be greater than 5%: a) Determine the center. After the clearance is fixed, turn the input shaft to 2a0 left and return to the neutral position, then turn the input shaft to 2a0 right and return to the middle position, and reciprocate twice. Measure the corresponding torque value of the input shaft each time when turning left and right, and substitute the torque value at 1 5° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 9° 8404. 2- 96
Heavy ball pin center rate multiplied by the center range, safety factor, take 3:
angle transmission ratio.
h measurement error is not greater than the lower 5%;
) After the test, disassemble the steering gear. The damage of the parts should be verified in the test report, 4.2 Drop impact test
4.2.1 Test conditions
) The steering gear should be semi-fixed on a test bench base with a mass not less than "times" that of the drop chain.) The shaft should be fixed vertically in the middle position;
c) The drop weight is 50kg.
4.2.2 Test method
1) Lift the drop chain horizontally to the height specified in Table 2 and drop it down The center of the pin hole during impact: 2° drop depth
Preferred pin position
Work piece N
Drop depth m
~24:56
h) After impact, disassemble and inspect the steering gear, check the indentations inside the parts, and check the damage conditions such as the effect.) The test results are shown in Table A7.
5 Service life test
5. 1 Test conditions
a) The test load is the vertical force acting on the ball pin: The lubricating oil concentration during the test shall not exceed 605.2 Test method
a) Two dynamic input shafts:
b) The input shaft rotates 180° from the middle position to the left and then returns to the standing position for a small cycle, and from the middle position to the left, then rotates to the dead point and returns to the neutral position for a large cycle. After every 10 cycles, one reverse cycle is performed; the test speed is not more than 3 cycles/min: d) During the test, it is allowed to rotate 180° from the middle position to the right and then return to the standing position for a small cycle. 5×10\ cycles, then test once, but replacement of zero line is not allowed:) Equal amplitude loading, the maximum amplitude error of the transfer is not more than 5%F) Number of tide cycles:
%) Test result filling format Table A8:
Converter structure formula
Input auxiliary enterprise conversion design value
Auspicious machine number
Wuling date
Cell character is relatively angle Jia <)
Shaft rotation ()
Transmission ratio 4
Prototype machine number
Towards the input shaft bud
JB/T 8404.196
Attachment A
Format of the national mourning in the test report
(Appendix to the report)
Table A1 Tractor steering gear parameters
Fast direction angular transmission ratio design value
Form filler
Table A2 Angular transmission ratio test
Year transmission wash
Figure AI Angular transmission ratio sustainability curve
Table A: Transmission limit test
Input range
Prototype shrinkage
Trial date
Screen shaft conversion
Average position of transmission efficiency
Left special
JD/T B404.2-96
Figure A2 Transmission light characteristic curve
Table A4 Transmission efficiency test
Right turn
Transmission, for
Figure A3 Transmission efficiency characteristic curve
According to the format
Left turn
Input into the light
With rotation and
Prototype bow
Test date
Transmission side
Input Auxiliary rotation
Serial machine number
Test date
Turn direction
Control rotation angle
Prototype number
Test period
Impact speed
Songjini numberbzxZ.net
Test period
Transmission number
First time
Second time
Average value
N·m/rad
JB/T 8404. 2 -96
Table A5 No-load rotation resistance torque test
Table A6 Degree test
Small angle
Operator
Large rotation degree
Table 17 Impact test
Condition before impact
Table A8 Life test
Year to
Year to
Condition before test and size
Operator
Observation results and size measurement
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