Double-station hub bearing mud simulation testing machine

Abstract

The invention relates to the technical field of bearing detection, in particular to a double-station hub bearing mud simulation testing machine which comprises an experiment box, a digital display controller, a mud supply container and two simulation test units located in the left side and the right side of the experiment box respectively. The simulation test unit comprises a driving mechanism, a hub bearing supporting mechanism, an axial load loading mechanism, a radial load loading mechanism and a slurry spraying mechanism, the hub bearing supporting mechanism comprises a main shaft, one end of the main shaft is connected with the driving mechanism, the other end of the main shaft is connected with an inner ring of the hub bearing, the axial load loading mechanism is connected to the main shaft, and the radial load loading mechanism is connected to the inner ring of the hub bearing. The radial load loading mechanism is connected to the outer ring of the hub bearing; the slurry spraying mechanism comprises an annular spraying pipeline connected with the slurry pump and spraying heads arrayed on the annular spraying pipeline, and a stop valve is arranged between every two adjacent spraying heads. According to the invention, more accurate measurement of the hub bearing load and multi-working-condition detection of a mud experiment can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of bearing detection, and in particular to a double-station wheel hub bearing mud simulation testing machine. Background Art

[0002] Automobile wheel hub bearings are the most important transmission components in automobiles. They rotate at high speed with the automobile transmission shaft, bear axial and radial loads during operation and have to operate in adverse weather and road conditions. Various information such as their condition during long-term operation, fatigue level, and water immersion test need to be tested and inspected. Only by collecting information data and analyzing and judging various data can the comprehensive performance of the bearings be obtained, thereby determining whether the bearings are qualified.

[0003] For example, patent documents with application numbers 200810141235.7 and 200520032608.9 disclose testing machines for conducting mud durability tests on wheel hub bearings. The testing machines also have axial loading and radial loading structures, and can conduct conventional carrier tests and mud durability tests. However, the testing machines in the prior art concentrate axial loading and radial loading in one place, that is, the loading forces of the axial loading and radial loading are both applied to a loading plate, and then the loading force is applied to the wheel hub bearing through the loading plate. Such a loading state causes a certain interference between the radial loading and the axial loading, and the load cannot be applied to the wheel hub bearing well.

[0004] Moreover, in mud tests, the existing technology usually uses a single nozzle for spraying mud. Although some documents disclose multiple nozzles and multi-angle adjustment of the nozzles, it cannot simulate various working conditions of wheels driving in mud, such as mud splashing, mud immersion or mud impact, and cannot enable the experimenter to directly observe the state of the mud flushing area.

[0005] Therefore, a testing machine is needed that can visually observe the mud flushing status and accurately detect the performance of the wheel hub bearing. Summary of the invention

[0006] The present invention provides a double-station wheel hub bearing mud simulation testing machine, which is used to solve the above technical problems and realize more accurate detection of wheel hub bearing load and multi-condition detection of mud tests.

[0007] The technical solution adopted by this application to solve this technical problem is: A double-station wheel hub bearing mud simulation test machine, comprising a test box, and also comprising: The digital display controller is located outside the experimental box and is used to control the operation of the moving parts in the experimental box and display the load loading status; A mud supply container, located outside the test box, is used to stir and mix the mud and supply the mud to the wheel hub bearing for experimental use; The simulation test unit has two sets, which are respectively located on the left and right sides of the test box, including a driving mechanism, a wheel hub bearing support mechanism, an axial load loading mechanism, a radial load loading mechanism and a mud spraying mechanism. The wheel hub bearing support mechanism includes a main shaft, one end of the main shaft is connected to the driving mechanism, and the other end is connected to the inner ring of the wheel hub bearing. The axial load loading mechanism is connected to the main shaft, and the radial load loading mechanism is connected to the outer ring of the wheel hub bearing; the mud spraying mechanism includes a mud pump, an annular spray pipe connected to the mud pump, and a spray head arrayed on the annular spray pipe, and a stop valve is provided between each two adjacent spray heads.

[0008] The axial load loading mechanism is connected to the main shaft, and loads the axial load to the inner ring of the hub bearing through the main shaft. The radial carrier is connected to the outer ring of the hub bearing, so that the load condition of the entire hub bearing is basically consistent with the load condition of the vehicle. Each load acts on the hub bearing separately. Compared with the existing technology, the detection value is more accurate.

[0009] The spray pipe of the mud spray mechanism is annular, so that the experimenters can directly observe the mud spraying conditions from the middle. There is a stop valve between each two adjacent spray heads. By opening and closing the stop valve and the speed of the mud pump, the area of ​​the mud flushing hub bearing can be controlled, thereby realizing the simulation of various working conditions.

[0010] Furthermore, a recovery trough is provided below the spray pipe, and the recovery trough is used to recover the mud and return the mud to the mud supply container. The recovery trough is fixedly connected to the spray pipe, and an adjustment mechanism is provided below the recovery trough to achieve the adjustment of the rising and falling and horizontal direction of the mud spraying mechanism, thereby further realizing the simulation of more working conditions.

[0011] Furthermore, the adjustment mechanism structure includes a lifting adjustment member and a horizontal adjustment member, the lifting adjustment member controls the rise and fall of the mud spraying mechanism, and the horizontal adjustment member controls the direction of the spray head.

[0012] Furthermore, the horizontal adjustment member includes a worm, and the lifting adjustment member is provided with a worm wheel meshing with the worm. When the worm rotates, the lifting adjustment member is driven to rotate via the worm wheel, so as to achieve the effect of rotating the direction of the sprinkler head.

[0013] Furthermore, the axial load loading mechanism and the radial load loading mechanism both include a hydraulic cylinder and a pressure sensor, and the wheel hub bearing support mechanism also includes a mounting seat, which is fixedly connected in the experimental box, and a bearing is provided inside the mounting seat, and the bearing is in sliding contact with the main shaft, the left end of the main shaft extends out of the mounting seat and is connected to the output shaft of the driving mechanism via a coupling, and the main shaft is provided with an annular groove located between the coupling and the mounting seat, and the annular groove is connected to a drive plate via a thrust bearing, and the drive plate is connected to the sensor of the axial load loading mechanism; the right end of the main shaft extends out of the mounting seat and is connected to the inner ring of the wheel hub bearing via a spline shaft, and the outer ring of the wheel hub bearing is connected to the sensor of the radial load loading mechanism.

[0014] Furthermore, a temperature sensor and a vibration sensor are also provided on the outer ring of the wheel hub bearing.

[0015] Furthermore, a retaining ring is connected to the outer ring of the hub bearing, and the retaining ring is used to block mud to prevent the mud from contaminating the radial load loading mechanism and various sensors.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The mud spraying mechanism of the present invention has an annular spraying pipe, which allows the experimenter to directly see the spraying status through the window, and can use the stop valve and the rotation speed of the mud pump to adjust the spraying intensity, control the spraying angle through the adjustment mechanism, and simulate the durability of the wheel hub bearing in the presence of mud under multiple working conditions.

[0017] The axial load loading mechanism and radial load loading mechanism of the present invention act on different positions of the wheel hub bearing, so that the load loading condition is basically consistent with the vehicle load condition, and the load loading in each direction does not interfere with each other, making the measurement more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a front view of the present invention; Figure 3 yes Figure 2 AA section view; Figure 4 It is a structural schematic diagram of the simulation test unit of the present invention; Figure 5 is a sectional left view of the simulation test unit of the present invention; Figure 6 It is a structural schematic diagram of the mud spraying mechanism of the present invention.

[0019] The numbers in the attached drawings are: 1. control computer; 2. mud supply box; 3. experimental box; 5. mounting plate; 6. variable frequency speed regulating motor; 7. hub bearing support mechanism; 8. axial load loading mechanism; 9. radial load loading mechanism; 10. mud spraying mechanism; 11. partition plate; 12. door; 13. first window; 14. second window; 15. mounting seat; 16. main shaft; 17. bearing; 18. spline shaft; 19. coupling; 20. drive plate; 21. first hydraulic cylinder; 22. first pressure sensor; 23. connecting hole; 24. second hydraulic cylinder; 25. second pressure sensor; 26. mud pump; 27. conveying pipeline; 28. spray pipeline; 29. ​​spray head; 30. stop valve; 31. recovery tank; 32. mud return pipe; 33. telescopic rod; 34. worm gear; 35. worm; 36. handwheel; 37. retaining ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, a double-station mud testing machine includes a control computer 1, a mud supply box 2, a test box 3 and two sets of simulation test units. A mounting plate 5 is provided in the test box 3, and the mounting plate 5 divides the space inside the test box 3 into two front and rear chambers. Each set of simulation test units includes a variable frequency speed regulating motor 6, a hub bearing support mechanism 7, an axial load loading mechanism 8, a radial load loading mechanism 9 and a mud spraying mechanism 10, wherein the variable frequency speed regulating motor 6, the hub bearing support mechanism 7 and the axial load loading mechanism 8 are located at the rear side of the mounting plate 5, At the position corresponding to the two chambers, one end of the wheel hub bearing support mechanism 7 extends out of the mounting plate 5 and is connected to the wheel hub bearing. The radial load loading mechanism 9 and the mud spraying mechanism 10 are located in the chamber on the front side of the mounting plate 5. A partition plate 11 is provided in the chamber on the front side of the mounting plate 5. The partition plate 11 divides the chamber on the front side of the mounting plate 5 into two left and right experimental areas to avoid mutual influence between the two workstations. Both experimental areas are provided with an openable and closable door 12, and the door 12 is provided with a first viewing window 13 facing the wheel hub bearing and a second viewing window 14 facing the side of the wheel hub bearing.

[0022] like Figure 4 and Figure 5As shown, the wheel hub bearing support mechanism 7 includes a mounting seat 15 and a main shaft 16. The mounting seat 15 is relatively fixed to the experimental box 3. The main shaft 16 passes through the mounting seat 15. The length of the main shaft 16 is greater than the length of the mounting seat 15. A bearing 17 is provided between the main shaft 16 and the mounting seat 15. The length of the bearing 17 is at least 3 / 4 of the length of the mounting seat 15. The bearing 17 is in sliding contact with the main shaft 16, which can not only ensure the smooth rotation of the main shaft 16, but also does not limit the axial sliding of the main shaft 16, and can also eliminate the radial movement of the main shaft 16. Both ends of the main shaft 16 extend out of the mounting seat 15. The front end of the main shaft 16 is provided with a spline shaft 18. The main shaft 16 is connected to the inner ring of the wheel hub bearing via the spline shaft 18. The rear end of the main shaft 16 is connected to the variable frequency speed regulating motor 6 via a coupling 19. The main shaft 16 is provided with an annular groove located between the coupling 19 and the mounting seat 15, and is connected to the variable frequency speed regulating motor 6 via a coupling 19. The annular groove is rotatably connected to a drive plate 20, and the other end of the drive plate 20 is connected to an axial load loading mechanism 8, and the axial load loading mechanism 8 includes a first hydraulic cylinder 21 and a first pressure sensor 22. The shaft end of the first hydraulic cylinder 21 is connected to the drive plate 20 via the first pressure sensor 22. When the first hydraulic cylinder 21 applies pressure to the drive plate 20, the drive plate 20 transmits the pressure to the main shaft 16. Although the applied force is not in the same straight line as the main shaft 16, because the main shaft 16 is restricted by the bearing 17, no radial movement occurs. The axial force of the main shaft 16 on the wheel hub bearing is stable, and the force is in the same straight line as the wheel hub bearing, and no torque is generated on the wheel hub bearing. The stress condition of the wheel hub bearing when the car turns is detected according to the pressure applied by the first hydraulic cylinder 21 (such as continuous pressure, sinusoidal pressure, etc.).

[0023] The outer ring of the wheel hub bearing is connected to the mounting plate 5, and a vibration sensor, a leakage sensor and a temperature sensor are arranged on the outer ring of the wheel hub bearing. A connecting hole 23 corresponding to the outer ring of the wheel hub bearing is arranged on the mounting plate 5, and the connecting hole 23 is a long hole arranged vertically; the radial load loading mechanism 9 includes a second hydraulic cylinder 24 and a second pressure sensor 25, and the output end of the second hydraulic cylinder 24 is connected to the outer ring of the wheel hub bearing via the second pressure sensor 25. When the second hydraulic cylinder 24 applies pressure to the wheel hub bearing via the second pressure sensor 25, the outer ring of the wheel hub bearing directly applies pressure to the bearing roller to detect the stress state of the wheel hub bearing when the vehicle is fully loaded and unloaded.

[0024] The first pressure sensor 22 and the second pressure sensor 25 are both electrically connected to the control computer 1 to transmit pressure signals to the control computer 1 .

[0025] like Figure 3As shown, the mud spraying mechanism 10 includes a mud pump 26, a conveying pipe 27 and a spraying pipe 28. The inlet of the mud pump 26 is connected to the mud supply box 2, and the outlet is connected to the spraying pipe 28 through the conveying pipe 27. The spraying pipe 28 is annular. A plurality of spray heads 29 are arrayed on the spraying pipe 28. A stop valve 30 is provided between each two adjacent spray heads 29. A recovery tank 31 is provided below the spraying pipe 28. The recovery tank 31 is connected to a mud return pipe 32. The mud return pipe 32 is connected to the mud supply box 2. The mud pump 26 extracts mud from the mud supply box 2 and sprays mud water to the wheel hub bearing through the spray head 29. The mud water impacts the sealing surface of the wheel hub bearing, and cooperates with the drive of the variable frequency speed regulation motor 6 to detect the durability of the wheel hub bearing in the mud water.

[0026] When the stop valve 30 is opened and coordinated with the rotation speed of the mud pump 26, all the spray heads 29 can be sprayed to simulate the working condition that the wheel hub bearing is immersed in muddy water. When the stop valve 30 on the upper part of the spray pipe 28 is closed, the lower half circle of spray heads 29 can be sprayed to simulate the working condition that the wheel hub bearing is half immersed in muddy water. By opening several stop valves 30 on the right or left side and closing other stop valves 30, several spray heads 29 on the right or left side can be sprayed to simulate the impact of splashing water caused by rolling over by external vehicles during driving, thereby realizing simulation under multiple working conditions.

[0027] like Figure 6 As shown, a telescopic rod 33 is arranged below the recovery tank 31, and the telescopic rod 33 is arranged vertically. The top end of the telescopic rod 33 is connected to the bottom surface of the recovery tank 31 and pushes the recovery tank 31 and the spray pipe 28 to rise and fall. The lower end of the telescopic rod 33 is rotatably connected to the test box 3, and a worm gear 34 is arranged at the lower part of the telescopic rod 33. A worm 35 is meshed on the side of the worm gear 34. The worm 35 passes through the test box 3 and is connected to a handwheel 36 for manually adjusting the direction of the spray head 29, so as to realize bearing durability tests under more working conditions (such as direct injection or inclined injection of mud).

[0028] The middle part of the outer ring of the hub bearing is not closed to simulate the situation without a hub cover. Only a hole larger than the inner diameter of the outer ring of the hub bearing and smaller than the outer diameter of the outer ring of the hub bearing is provided at the end of the outer ring of the hub bearing to allow muddy water to pass through. This can not only meet the impact of muddy water on the bearing, but also enable the staff to observe the specific experimental conditions from the window.

[0029] A retaining ring 37 is connected to the outer ring of the hub bearing, and the retaining ring 37 is used to block mud to prevent the mud from contaminating the radial load loading mechanism 9 and various sensors.

[0030] The use principle of the present invention is as follows: The two wheel hub bearings are respectively connected to two sets of simulation test units, with the two wheel hub bearings facing opposite directions, that is, the inner end of one wheel hub bearing faces the mounting plate 5, and the outer end of the other wheel hub bearing faces the mounting plate 5, so that the durability test results of two bearings can be obtained in one test, and a comparative test can be formed at the same time to provide data support for the result analysis.

[0031] The mud pump 26 draws mud from the mud supply box 2 and transports it into the spray pipe 28, where the mud is distributed in the spray pipe 28 and sprayed out from the partial spray heads 29 opened by the stop valve 30. The state of mud spraying is different depending on the changes in parameters such as the number of stop valves 30 opened and the output pressure of the mud pump 26, thereby simulating different working conditions, such as driving fast in a stream or slowly passing a flooded bridge. The hand wheel 36 can be manually adjusted to adjust the direction of mud spraying, thereby simulating more working conditions, such as the situation where oncoming vehicles run over water on the road when meeting on a narrow road.

[0032] Because of the telescopic rod 33, when the mud test is not being carried out, the mud spraying mechanism 10 can be moved downward to avoid affecting the observation field of view, and the wheel hub bearing is also easier to install and disassemble.

[0033] When the variable frequency speed regulating motor 6 drives the main shaft 16 to rotate, the inner ring of the wheel hub bearing rotates, and the outer ring does not rotate due to the restriction of the bolts and the connecting holes 23, which is consistent with the installation state of the wheel hub bearing of the vehicle in the prior art. The axial load loading mechanism 8 applies load to the main shaft 16 through the driving plate 20, and the main shaft 16 tends to move to the right, so that the inner and outer rings of the wheel hub bearing produce relative pressure, thereby simulating the load conditions when the car is turning. The radial load loading mechanism 9 directly applies load to the outer ring of the wheel hub bearing to simulate the load conditions when the vehicle is loaded or bumping up and down. Multiple working conditions are simulated, and the vibration, temperature and other conditions are fed back through various sensors to comprehensively judge whether the wheel hub bearing is qualified.

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

Claims

1. A double-station wheel hub bearing mud simulation testing machine, characterized in that: Includes experimental box (3), also includes: A digital display controller, located outside the experimental box (3), is used to control the operation of the moving parts in the experimental box (3) and display the load loading status; A mud supply container, located inside the experimental box (3), is used to mix the mud and supply it to the wheel hub bearing; A simulation test unit, wherein the simulation test unit has two sets, both of which are located inside the test box (3), and include a driving mechanism, a wheel hub bearing support mechanism (7), an axial load loading mechanism (8), a radial load loading mechanism (9) and a mud spraying mechanism (10), wherein the wheel hub bearing support mechanism (7) includes a main shaft (16), the axial load loading mechanism (8) is connected to the main shaft (16), one end of the main shaft (16) is connected to the driving mechanism and the other end is connected to the inner ring of the wheel hub bearing, and the radial load loading mechanism (9) is connected to the outer ring of the wheel hub bearing; the mud spraying mechanism (10) includes a mud pump (26), an annular spraying pipe (28) connected to the mud pump (26), and a spray head (29) arrayed on the annular spraying pipe (28), and a stop valve (30) is provided between each two adjacent spray heads (29).

2. The double-station wheel hub bearing mud simulation testing machine according to claim 1 is characterized in that: A recovery trough (31) is provided below the spray pipe (28). The recovery trough (31) is used to recover mud and return the mud to the mud supply container. The recovery trough (31) is fixedly connected to the spray pipe (28), and an adjustment mechanism is provided below the recovery trough (31).

3. The double-station wheel hub bearing mud simulation testing machine according to claim 2 is characterized in that: The adjustment mechanism structure comprises a lifting adjustment member and a horizontal adjustment member, wherein the lifting adjustment member controls the rise and fall of the mud spraying mechanism (10), and the horizontal adjustment member controls the direction of the spraying head (29).

4. The double-station wheel hub bearing mud simulation testing machine according to claim 3 is characterized in that: The horizontal adjustment member comprises a worm (35), and the lifting adjustment member is provided with a worm wheel (34) meshing with the worm (35). When the worm (35) rotates, the lifting adjustment member is driven to rotate via the worm wheel (34), thereby achieving the effect of rotating the spray head (29).

5. The double-station wheel hub bearing mud simulation testing machine according to claim 1, characterized in that: The axial load loading mechanism (8) and the radial load loading mechanism (9) both include a hydraulic cylinder and a pressure sensor. The wheel hub bearing support mechanism (7) also includes a mounting seat (15). The mounting seat (15) is fixedly connected in the experimental box (3). A bearing bush (17) is provided inside the mounting seat (15). The bearing bush (17) is in sliding contact with the main shaft (16). The left end of the main shaft (16) extends out of the mounting seat (15) and is connected to the output shaft of the driving mechanism via a coupling (19). The main shaft (16) is provided with an annular groove located between the coupling and the mounting seat (15). The annular groove is connected to a driving plate (20) via a thrust bearing. The driving plate (20) is connected to the sensor of the axial load loading mechanism (8). The right end of the main shaft (16) extends out of the mounting seat (15) and is connected to the inner ring of the wheel hub bearing via a spline shaft (18). The outer ring of the wheel hub bearing is connected to the sensor of the radial load loading mechanism (9).

6. The double-station wheel hub bearing mud simulation testing machine according to claim 1, characterized in that: A temperature sensor and a vibration sensor are also provided on the outer ring of the wheel hub bearing.

7. The double-station wheel hub bearing mud simulation testing machine according to claim 1, characterized in that: A retaining ring (37) is connected to the outer ring of the hub bearing.

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