JB/T 5183-1991 Test method for hydrostatic steering system of wheeled tractors JB/T5183-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 5183-1991
Hydrostatic Steering System for Wheeled Tractors
Test Methods
Published on 1991-05-18
Practical Application on 1992-01-01
Hydrostatic Steering System for Wheeled Tractors
Test Methods
Subject Content and Scope of Application
This standard specifies the test methods for the hydrostatic steering system of wheeled tractors. This standard applies to the open-center and closed-center hydrostatic steering systems of wheeled tractors. Reference standards
GB3766 General technical conditions for hydraulic systems
3 Test conditions
3.1 Test preparation
JB/T5183-1991
3.1.1 Install all parts of the steering system under test, such as hydraulic pump, hydrostatic steering gear, steering cylinder, various valves, filters, coolers, etc., on the test bench according to relevant technical documents. According to the layout of the test bench, the hydraulic pipelines of the original system can be installed in whole or in part on the test bench, and the remaining pipelines can be added separately. 3.1.2 After the steering system under test is installed on the test bench, the pipeline length of each steering component shall not be greater than twice the pipeline length of the original system. Compared with the original system, there shall be no more than two bends in the pipeline. The diameter of the newly added pipeline shall be the same as that of the original system. 3.1.3 After the steering system under test is installed on the test bench, it shall be run-in according to the run-in specifications specified by the manufacturer. 3.2 Test oilwww.bzxz.net
3.2.1 Oil: In bench test, the test oil shall be consistent with the oil used in the tractor of the tested system. 3.2.2 Oil temperature: 65±5℃ (except for high and low temperature steering performance test). 3.2.3 Filtration requirement: not less than 20um.
3.3 Test equipment and instrument requirements
3.3.1 See Appendix A (reference) for the schematic diagram of the hydraulic system of the test equipment. 3.3.2 The test instrument shall be calibrated by the relevant department, and within the validity period of the calibration, the instrument measurement accuracy shall comply with the provisions of Table 1 Table 1
Measurement parameter name
Angular displacement
3.3.3 Other requirements shall be in accordance with the relevant provisions of GB3766. Approved by the Ministry of Machinery and Electronics Industry on May 18, 1991 Accuracy requirements
Implementation on January 1, 1992
Test items and methods
4.1 Steering parameter measurement test
4.1.1 Test conditions
JB/T51831991
Hydraulic pump speed is 50% of the engine rated speed, the steering gear inlet pressure is the rated working pressure, and the steering wheel speed is 60r/min.
4.1.2 Test steps
Under the above conditions, mechanically rotate the steering wheel shaft to make the tested steering system complete a full steering action (i.e. neutral position → right dead point → neutral position → left dead point → neutral position, the same below), and at the same time measure the steering wheel angular displacement and the corresponding steering knuckle arm deflection angle (for the folding steering tractor, it is the relative deflection angle of the front and rear frames), so as to draw the steering system angular displacement curve. (See Appendix Figure B1). According to the angular displacement curve, find the following parameters: a. Total steering wheel rotation angle, (°):
b. Steering wheel rotation angle from neutral position to right dead point (°): c. Steering wheel rotation angle from neutral position to left dead point (°); d. Right steering knuckle arm deflection angle from neutral position to right dead point (°); e. Left steering knuckle arm deflection angle from neutral position to left dead point (°); f. Steering wheel neutral position free travel, (°). 4.2 Steering wheel operating torque test
4.2.1 Test conditions
Hydraulic pump speed is 1/3 of the engine rated speed, steering gear inlet pressure is rated working pressure, steering wheel vehicle speed is 60r/min.
4.2.2 Test steps
Mechanically rotate the steering wheel shaft to make the tested steering system complete a full steering action, measure the steering wheel angular displacement and steering wheel operating torque, and draw the steering wheel operating torque characteristic curve (see Appendix Figure B2). Check according to the curve: a. Whether the operating torque increases significantly when approaching the left or right dead point, and find out the maximum operating torque of the steering wheel: b. Whether the curve is smooth and whether there is any sticking phenomenon 4.3 Internal leakage test
4.3.1 Test conditions
Hydraulic pump speed is the hydraulic pump speed when it is 50% of the rated engine speed. 4.3.2 Test steps
Make the steering system under test stop at the left (right) dead point, adjust the steering wheel drive device, and mechanically rotate the steering wheel shaft with the maximum operating torque measured in Article 4.2, and measure the number of turns of the steering wheel per minute, three times in each direction, and take the average value of each. 4.4 Pressure loss test
4.4.1 For the open-center hydrostatic steering system, the hydraulic pump speed is the speed at the rated engine speed, a: Make the steering system under test in the neutral position, and the steering wheel speed is 0, and measure the force difference of the steering gear P port → O port (see Figure A1) (this pressure difference is the neutral position pressure loss). b. Mechanically rotate the steering wheel shaft to make the tested steering system perform continuous full steering operation. The steering wheel speed is 60r/min. The pressure difference between the steering gear inlet and the steering gear inlet is JB/T5183-1991
(the sum of these two pressure differences is the pressure loss during steering). 4.4.2 For the closed-center hydrostatic steering system, the hydraulic pump speed is the hydraulic pump speed at the rated engine speed, the steering gear inlet pressure is the rated working pressure, and the steering wheel speed is 60r/min. Under this working condition, mechanically rotate the steering wheel shaft to make the tested steering system perform continuous full steering operation. At the same time, adjust the loading valve 21 to gradually load the steering system until the steering operating torque has a significant upward trend (manual steering phenomenon occurs). Measure the pressure difference between the steering gear P port → A port (P port → B port) and B port - → O port (A port → +O port) at this time (the sum of these two pressure differences is the pressure loss during steering). 4.5 Manual steering performance test
Stop the oil supply of the hydraulic pump, mechanically rotate the steering wheel shaft to make the steering wheel speed 10r/min, adjust the loading valve 21 (see Figure A1) so that the maximum torque measured by the torque sensor 26 is equal to the design value of the tractor steering resistance torque. Under this condition, observe whether the steering is normal, and measure the maximum steering torque of the steering wheel.
4.6 High temperature internal leakage test
Except that the oil temperature is not lower than 90℃, the rest is the same as 4.3. 4.7 Low temperature manual steering performance test
Except that the oil temperature is not higher than -20℃ and there is no requirement for the steering wheel speed, the rest is the same as 4.5. 4.8 Endurance test
The hydraulic pump speed is 50% of the engine rated speed, the maximum pressure of the steering gear inlet is the rated working pressure, the steering wheel speed is 60r/min, the steering wheel shaft is mechanically rotated, and after a small cycle of 10 left and right turns (each time the steering shaft rotates 360°), a large cycle of left and right turns to the dead point is performed again, and the steering shaft rotates 300,000 times in total. After the test, an internal leakage test is performed according to 4.3 to check the performance degradation.
1-DC motor:
6-Safety valve:
JB/T5183-1991
Appendix A
Schematic diagram of tractor hydrostatic steering system test equipment (reference part)
2-Speed ​​sensor:
7-Fine filter:
11-Solenoid reversing valve:
16-Test steering cylinder;
21-Loading valve;
3- Steering pump under test;
8-steering gear under test;
12-speed regulating valve:
17-loading oil cylinder;
22-back pressure valve:
4-coarse filter:
9-angular displacement sensor;
13-amount oil pump:
18-check valve:
23-pressure gauge;
14-AC motor:
19-variable oil pump: ||tt| |24-loading shaft;
5-oil tank;
10-driving hydraulic motor;
15-steering trapezoid:
20-overflow valve:
25-bracket;
26-torque sensor
Additional instructions:
(Fuzhou)
JB/T5183-1991
Appendix B
Typical test curves of tractor hydrostatic steering system ( Reference)
Turntable angle (》Left (right) turn
Steering wheel-steering knuckle arm angular displacement curve
Longitudinal moment
(N·m)
Mid-position
Steering wheel operating torque characteristic curve
This standard is proposed and managed by the Luoyang Tractor Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Luoyang Tractor Research Institute. The main drafter of this standard is Li Yisheng
Turntable angle:\
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