CN116223035A - Bearing accelerated life test bed - Google Patents

Abstract

The invention provides a bearing accelerated life test bed which comprises a platform bottom plate, a driving structure, a supporting structure, an oil tank, an axial loading structure, a radial loading structure, an axial supporting structure body and a bearing component to be tested, wherein the driving structure, the supporting structure, the oil tank and the axial supporting structure body are sequentially arranged on the platform bottom plate, the bearing component to be tested is arranged in an inner cavity of the oil tank, one end of the driving structure is connected with one end of the supporting structure, the other end of the supporting structure penetrates through the oil tank to be connected with one end of the bearing component to be tested, one end of the axial loading structure is contacted with the other end of the bearing component to be tested, and the other end of the axial loading structure penetrates through the oil tank to be connected with the axial supporting structure body.

Description

A Bearing Accelerated Life Test Bench

technical field

The invention belongs to the technical field of bearing tests, in particular to a bearing accelerated life test bench.

Background technique

As an important basic component of mechanical equipment, bearings play an important role in industry and national defense. At the same time, bearings are also the weak link in mechanical equipment, which largely determines the service life of a piece of equipment. Through the accelerated life test of bearings, the full life cycle time of bearings can be obtained in a short period of time, and effective technical support can be provided for the operation and maintenance of equipment.

The working condition of the bearing in the equipment is complex and changeable, and it usually bears a large load. For a test bench that bears a large load, a large reduction mechanism is required to operate, which will increase the manufacturing cost. In addition, the current test bench can only apply a single radial load or axial load, and there is no test bench that applies radial load and axial load at the same time. Furthermore, the lubrication methods are generally grease lubrication and oil-immersion lubrication. Grease lubrication can be directly applied and filled before the test. There is no test bench for lubricating the test bearings during the working process, which increases the workload of the preliminary test and reduces the test efficiency. . Most of the current test rigs take bearings that can only load radial loads and are lubricated by grease as the test target, and the test rig cannot provide large-load operation and cannot be tested according to different working conditions.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to provide a bearing accelerated life test rig, which can solve the problem that the current test rigs mostly use bearings that can only load radial loads and the lubrication method is grease lubrication, and the test rig cannot provide Running with heavy load, it cannot be tested according to different working conditions.

In order to solve the above problems, the present invention provides a bearing accelerated life test bench, including a platform bottom plate, a driving structure, a supporting structure, an oil tank, an axial loading structure, a radial loading structure, an axial supporting structure and a bearing assembly to be tested;

The drive structure, support structure, oil tank and axial support structure are installed on the platform bottom plate in sequence, the bearing assembly to be tested is arranged in the inner cavity of the oil tank, one end of the drive structure is connected to one end of the support structure, and the other end of the support structure passes through the oil tank and the to-be-tested One end of the test bearing assembly is connected, one end of the axial loading structure is in contact with the other end of the bearing assembly to be tested, and the other end of the axial loading structure passes through the oil tank to connect with the axial support structure, so that the axial loading structure treats Test the axial direction of the bearing assembly;

One end of the radial loading structure is connected to the bottom plate of the platform, and the other end of the radial loading structure passes through the oil tank and contacts the lower end of the component to be tested, so that the radial loading structure can test the bearing component to be tested in the radial direction.

Optionally, the support structure includes a support shaft and a bearing seat;

The bearing seat is connected with the bottom plate of the platform, the supporting shaft is rotated and set in the inner cavity of the bearing seat, and the two ends of the supporting shaft pass through the bearing seat, one end of the supporting shaft is connected with the driving structure through a coupling, and the other end of the supporting shaft runs through the oil tank Connect to the bearing assembly to be tested.

Optionally, the support structure further includes a lock nut, a first support bearing and a second support bearing;

The outer surface of one side of the support shaft is connected to the bearing seat through the first support bearing, the outer surface of the other side of the support shaft is connected to the bearing seat through the second support bearing, and the outer surface of the support shaft is set close to the first support bearing There is a lock nut, and one side wall of the lock nut is against the side wall of the first support bearing.

Optionally, the outer surface of the support shaft is sequentially provided with a first shoulder, a second shoulder, a third shoulder, a fourth shoulder, a fifth shoulder, a sixth shoulder, a seventh shoulder, and an eighth shoulder shoulder and the ninth shoulder;

The first shoulder of the support shaft is connected with the coupling, the outer surface of the third shoulder of the support shaft is connected with the bearing seat through the first support bearing, and the lock nut is arranged on the outer surface of the second shoulder of the support shaft, The outer surface of the fifth shoulder of the support shaft is connected to the bearing seat through the second support bearing, and the side wall of the sixth shoulder of the support shaft is in contact with the side wall of the bearing seat, so that the sixth shoulder is opposite to the second The supporting bearing is positioned, the seventh shoulder of the supporting shaft runs through the oil tank, and the seventh shoulder is in sealing connection with the oil tank, and the ninth shoulder of the supporting shaft is connected with the bearing assembly to be tested.

Optionally, the bearing assembly to be tested includes a bearing to be tested and a test bearing housing;

The outer ring of the bearing to be tested is installed in the inner cavity of the test bearing seat, and the test bearing seat is arranged in the inner cavity of the oil tank. The outer surface of the ninth shoulder of the support shaft is connected with the inner ring of the bearing to be tested by interference fit. The end face is in contact with the radially loaded structure, and the outer ring of the bearing to be tested is in contact with the axially loaded structure.

Optionally, the axial loading structure includes an axial force column, an axial hydraulic cylinder, an axial load cell and an axial positioning cover;

One end of the axial force column is installed in the test bearing seat, and one end of the axial force column is in contact with the side wall of the outer ring of the bearing to be tested, and the axial positioning cover is connected with the side wall of the axial support structure. The force sensor is arranged in the inner cavity of the axial positioning cover, and the axial force sensor is connected with the axial support structure, and the axial hydraulic cylinder is arranged in the inner cavity of the axial positioning cover, and is arranged close to the axial force column. The other end of the axial force column passes through the fuel tank and is arranged in contact with the left side of the axial hydraulic cylinder, and the right side of the axial hydraulic cylinder is arranged in contact with the axial load cell.

Optionally, the outer surface of the axial force column is provided with the first step of the axial force column, the second step of the axial force column and the third step of the axial force column, and the outer surface of the axial positioning cover is provided with an axial positioning cover The first step, the second step of the axial positioning cover, the third step of the axial positioning cover;

The first step of the axial force column is installed in the inner cavity of the test bearing seat, and the inner wall of the first step of the axial force column is in contact with the side wall of the outer ring of the bearing to be tested, and the second step of the axial force column penetrates the oil tank, and The second step of the axial force column is sealed with the oil tank, the third step of the axial force column is installed in the inner cavity of the first step of the axial positioning cover, and the third step of the axial force column is connected to the left side of the axial hydraulic cylinder. touch;

Among them, the axial hydraulic cylinder is installed in the inner cavity of the second step of the axial positioning cover, the axial force sensor is installed in the inner cavity of the third step of the axial positioning cover, and the axial force sensor is connected with the axial support structure, The right side of the axial hydraulic cylinder is in contact with the left side of the axial load cell, and the fourth step of the axial positioning cover is connected with the axial support structure.

Optionally, the radial loading structure includes a radial force column, a radial hydraulic cylinder and a radial load cell;

The radial force sensor is connected to the platform bottom plate, the radial hydraulic cylinder is set on the top of the radial force sensor, and the bottom surface of the radial hydraulic cylinder is set in contact with the top of the radial force sensor, and the radial force column is set on The top of the radial hydraulic cylinder, and the bottom surface of the radial force column is in contact with the top of the radial hydraulic cylinder, the upper end of the radial force column passes through the oil tank and contacts the bottom surface of the test bearing seat, and the radial force column is in contact with the oil tank Sealed connection between.

Optionally, the drive structure includes a motor base and a drive motor, the motor base is installed on the platform bottom plate, the drive motor is installed on the motor base, and the drive motor is connected to one end of the support shaft through a coupling.

Optionally, a plurality of platform floor anchor bolts are evenly arranged on the lower surface of the platform floor, and a plurality of oil tank anchor bolts are evenly arranged on the lower surface of the fuel tank, and the plurality of oil tank anchor bolts are all in contact with the upper surface of the platform floor.

Beneficial effect

The accelerated life test bench for bearings provided in the embodiments of the present invention can output torque through the drive structure without additional installation of a deceleration mechanism, that is, to achieve large-load operation, and to test the bearing through the radial loading structure and the axial loading structure. At the same time, through different working conditions, add oil to the oil tank, and then solve the problem that most of the current test benches use bearings that can only load radial loads and the lubrication method is grease lubrication, and the test bench cannot provide large loads. It cannot be tested according to different working conditions, and the simulation conditions of the test bench are not yet perfect.

Compared with the prior art, the present invention has the following advantages and outstanding technical effects:

1. The test bench omits the deceleration mechanism to avoid bloated design. The loading load is mainly borne by the first support bearing and the second support bearing. In addition, an elastic coupling is used between the motor shaft and the support shaft, so that the driving motor is basically in a no-load state. , so that the drive motor can operate normally under heavy load conditions without additional reduction mechanism.

2. The radial loading structure and axial loading structure of the test bench do not interfere with each other. The radial load and axial load of the bearing to be tested can be applied at the same time or separately, and can be used for accelerated tests on different types of bearings.

3. In the radial loading structure and the axial loading structure, the radial load and the axial load act on the bearing to be tested in the vertical and horizontal directions respectively, and the hydraulic cylinder is in direct contact with the force sensor. The structure is compact and the test is accurate. During the test, the external instrument of the load cell can display the load loading value in real time.

4. The bearing to be tested is installed in the test bearing seat. The wall thickness of the lower end of the test bearing seat ensures the reliability of radial loading, and the upper end wall is thin. It is used for the installation of the vibration sensor in the test to ensure that the vibration signal of the bearing to be tested is fully compatible with the sensor. near.

5. For bearings immersed in oil under actual working conditions, the bearings to be tested can also be immersed in oil in the test, and the oil can lubricate and cool at the same time. Among them, the oil tank and support shaft, radial loading structure, and axial loading structure Coupled together to save space, the support shaft is sealed with a high-speed rotary oil seal to ensure that the oil will not leak out when the support shaft rotates at high speed. Play the role of height adjustment to ensure the installation accuracy of the fuel tank in the test.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a bearing accelerated life test bench according to an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of a bearing accelerated life test bench according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a support shaft according to an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a test bearing seat installed with a test bearing according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an axial force column according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of an axial positioning cover according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of the structure of the fuel tank according to the embodiment of the present invention.

The reference signs are indicated as:

1. Platform bottom plate anchor bolts; 2. Platform bottom plate; 3. Motor seat; 4. Driving motor; 5. Coupling; 6. Lock nut; 7. Support shaft; 31. First shoulder; 32. Second Second shoulder; 33, third shoulder; 34, fourth shoulder; 35, fifth shoulder; 36, sixth shoulder; 37, seventh shoulder; 38, eighth shoulder; 39, ninth Shaft shoulder; 8a, first support bearing; 8b, second support bearing; 9, bearing seat; 10, fuel tank; 11a, first flange; 11b, second flange; 11c, third flange; 12a, first flange A rotary oil seal; 12b, the second rotary oil seal; 12c, the third rotary oil seal; 13, the oil tank anchor bolt; 14, the bearing to be tested; 15, the test bearing seat; 16, the radial force column; 17, the radial hydraulic cylinder ; 18, radial load cell; 19, axial force column; 41, the first step of axial force column; 42, the second step of axial force column; 43, the third step of axial force column; 20, axial Hydraulic cylinder; 21. Axial load cell; 22. Axial positioning cover; 51. The first step of the axial positioning cover; 52. The second step of the axial positioning cover; 53. The third step of the axial positioning cover; 23. Axial support structure.

Detailed ways

Referring to Figures 1 to 7, according to an embodiment of the present invention, a bearing accelerated life test bench, please refer to Figure 1, includes a platform bottom plate 2, a driving structure, a supporting structure, an oil tank 10, an axial loading structure, a The loading structure, the axial support structure 23 and the bearing assembly to be tested; the driving structure, the support structure, the oil tank 10 and the axial support structure 23 are sequentially installed on the platform bottom plate 2, and the bearing assembly to be tested is arranged in the inner cavity of the oil tank 10, One end of the drive structure is connected to one end of the support structure, the other end of the support structure passes through the oil tank 10 and is connected to one end of the bearing assembly to be tested, one end of the axial loading structure is in contact with the other end of the bearing assembly to be tested, and the other end of the axial loading structure The other end passes through the oil tank 10 and is connected to the axial support structure 23, so that the axial loading structure is tested in the axial direction of the bearing assembly to be tested; one end of the radial loading structure is connected to the platform bottom plate 2, and the radial loading structure The other end passes through the oil tank 10 and is in contact with the lower end of the component to be tested, so that the radially loaded structure can perform a radial direction test on the bearing component to be tested. The support is given by the platform bottom plate 2, and the drive structure and the support structure are connected by a coupling 5, so that the drive structure can operate under heavy load conditions without an additional reduction mechanism, and the bearing assembly to be tested is supported by the support structure , the bearing assembly to be tested is accelerated through the axial loading structure and the radial loading structure. At the same time, the axial loading assembly and the radial loading assembly do not interfere with each other and work independently. At the same time, according to different working conditions , add oil to the inner cavity of the oil tank 10, and then solve the problem that most of the current test benches use bearings that can only load radial loads and are lubricated with grease as the test target, and the test bench cannot provide large-load operation, and cannot be used according to different jobs. Condition test, the simulation condition of the test bench is not yet perfect.

Further, the drive structure, support structure, oil tank 10, bearing assembly to be tested, axial loading structure and axial support structure 23 are sequentially arranged on the platform bottom plate 2 from left to right, wherein the bearing assembly to be tested is arranged on the oil tank 10 lumen.

Further, the platform bottom plate 2 is connected with eight platform bottom plate anchor bolts 1 through threaded connection, and the platform bottom plate anchor bolts 1 are directly in contact with the ground, and are used to adjust the height of the platform bottom plate 2 and reduce the vibration effect during the test; the motor base 3 is fixed on the platform bottom plate 2 through bolt connection, the drive motor 4 is fixed on the motor base 3 through bolt connection, and the drive motor 4 is connected with the first shoulder 31 of the support shaft 7 through the coupling 5 .

Please refer to Fig. 2, the support structure includes a support shaft 7, a bearing seat 9, a lock nut 6, a first support bearing 8a and a second support bearing 8b; The rotation is arranged in the inner cavity of the bearing seat 9, and the two ends of the support shaft 7 move through the bearing seat 9, the first shoulder 31 of the support shaft 7 is connected with the coupling 5, and the first shoulder 31 passes through the coupling 5 Connected with the drive motor 4 in the drive structure, the inner ring of the first support bearing 8a is installed on the third shoulder 33 of the support shaft 7, and the outer ring of the first support bearing 8a is installed in the bearing housing 9, and at the same time through The lock nut 6 and the bearing seat 9 installed on the second shoulder 32 of the support shaft 7 position the first support bearing 8a, and the inner ring of the second support bearing 8b is installed on the fifth shoulder 35 of the support shaft 7 , and the outer ring of the second support bearing 8b is installed in the bearing seat 9, and the second support bearing 8b is positioned by the sixth shoulder 36 of the support shaft 7 and the bearing seat 9.

Further, please refer to Fig. 3, the support shaft 7 is a stepped shaft, with a first shoulder 31, a second shoulder 32, a third shoulder 33, a fourth shoulder 34, a fifth shoulder 35, a sixth shoulder Shoulder 36, the seventh shoulder 37, the eighth shoulder 38 and the ninth shoulder 39, the first shoulder 31 is connected with the shaft coupling 5, the outer surface of the second shoulder 32 is provided with external threads, and is locked with the The nut 6 is connected by threads, please refer to FIG. 2 , the side wall of the lock nut 6 is against the left side wall of the first support bearing 8a, and plays an axial positioning role.

Further, the third shoulder 33 is in interference fit with the inner ring of the first support bearing 8a, the fifth shoulder 35 is in interference fit with the inner ring of the second support bearing 8b, and is axially positioned by the sixth shoulder 36 , the seventh shoulder 37 passes through the oil tank 10, please refer to Figure 7, the oil tank 10 is provided with a first flange 11a, the first flange 11a is equipped with a first rotary oil seal 12a, the seventh shoulder 37 and the first rotary The oil seal 12a is an interference fit, used for sealing the support shaft 7 and the oil tank 10;

Further, the ninth shoulder 39 is in interference fit with the inner ring of the bearing 14 to be tested, and is axially positioned through the eighth shoulder 38. The shoulder of the eighth shoulder 38 is provided with a chamfer for convenience. Disassembly and replacement of measuring bearing 14.

Please refer to Fig. 1 and Fig. 2, and Fig. 4, the bearing assembly to be tested comprises the bearing to be tested 14 and the test bearing seat 15, and the outer ring of the bearing to be tested 14 is installed in the inner cavity of the test bearing seat 15, and the test bearing seat 15 is arranged in the oil tank 10 inner cavity, the outer surface of the ninth shoulder 39 of the support shaft 7 is connected with the inner ring of the bearing 14 to be tested with an interference fit, the inner ring of the bearing 14 to be tested is positioned by the eighth shoulder 38 of the support shaft 7, and the test The lower end surface of the bearing seat 15 is in contact with the radial loading structure, and the outer ring of the bearing to be tested 14 is in contact with the axial loading structure.

Further, the outer ring of the bearing 14 to be tested is positioned by the first step 41 of the axial force column 19 of the axial loading structure, and the bottom surface of the test bearing seat 15 directly contacts the radial force in the radial loading structure. The upper end of the column 16 , that is, the upper end of the radial force column 16 directly abuts against the lower surface of the test bearing seat 15 .

The axial loading structure includes an axial force column 19, an axial hydraulic cylinder 20, an axial force sensor 21 and an axial positioning cover 22; please refer to FIG. 5, the axial force column 19 is a stepped column, and the axial force column 19 The outer surface is provided with the first step 41 of the axial force column, the second step 42 of the axial force column and the third step 43 of the axial force column. Please refer to FIG. The outer surface of the positioning cover 22 is provided with a first step 51 of the axial positioning cover, a second step 52 of the axial positioning cover, and a third step 53 of the axial positioning cover.

Further, the first step 41 of the axial force column 19 is installed in the inner cavity of the test bearing seat 15, the first step 41 of the axial force column and the test bearing seat 15 are clearance fit, and the axial force The inner cavity of the first step 41 of the column directly contacts the side wall of the outer ring of the bearing 14 to be tested, and the thickness of the ring wall of the first step 41 of the axial force column is equal to the thickness of the side wall of the outer ring of the bearing 14 to be tested, which is used for the bearing 14 to be tested. Uniform loading of axial loads.

Further, the second step 42 of the axial force column passes through the oil tank 10. Please refer to FIG. 12b is in interference fit with the second step 42 of the axial force column and is sealed.

Further, the third step 43 of the axial force column is installed on the first step 51 of the axial positioning cover, wherein the thickness of the test bearing seat 15 is 5 mm thicker than the thickness of the bearing 14 to be tested, and is used for the first step 41 of the axial force column. For installation and positioning, please refer to FIG. 4 , the upper surface of the test bearing seat 15 is used for the installation of the vibration sensor in the test, which is convenient for the collection of the vibration signal of the bearing 14 to be tested.

Further, the axial support structure 23 is fixed on the platform bottom plate 2 through bolt connection, the third step 53 of the axial positioning cover is installed on the axial support structure 23 through bolts, and the inner cavity of the second step 52 of the axial positioning cover is installed Axial force sensor 21, meanwhile, axial force sensor 21 is also fixedly installed on the axial support structure 23 by bolts, axial hydraulic cylinder 20 is installed in the inner cavity of the first step 51 of the axial positioning cover, and axial hydraulic cylinder 20 The right side of the shaft is directly against the left side of the axial load cell 21.

Please refer to Fig. 2, the radial loading structure includes a radial force column 16, a radial hydraulic cylinder 17 and a radial force sensor 18; the radial force sensor 18 and the platform bottom plate 2 are fixedly connected by bolts, and the radial hydraulic cylinder 17 is arranged on the top of the radial load cell 18, and the bottom surface of the radial hydraulic cylinder 17 is arranged in contact with the top of the radial load cell 18, and the radial force column 16 is arranged on the top of the radial hydraulic cylinder 17, and the diameter The bottom surface of the radial force column 16 is set in contact with the top of the radial hydraulic cylinder 17, the upper end of the radial force column 16 passes through the oil tank 10 and contacts the bottom surface of the test bearing seat 15, and the gap between the radial force column 16 and the oil tank 10 Sealed connection.

Further, please refer to Fig. 7, the radial force column 16 passes through the oil tank 10, the third flange 11c is installed on the oil tank 10, the third rotary oil seal 12c is installed on the third flange 11c, the third rotary oil seal 12c is connected with the radial The force column 16 has an interference fit for sealing.

Further, the bottom surface of the fuel tank 10 is connected with four fuel tank anchor bolts 13 through threads, and the fuel tank anchor bolts 13 are in contact with the platform bottom plate 2 for adjusting the height of the fuel tank 10 and reducing the vibration effect during the test.

Please refer to Fig. 1, the principle and test process of the present invention are as follows: when the radial hydraulic cylinder 17 is loaded, the load passes through the radial force column 16 and the test bearing seat 15 in turn, and acts on the outer ring of the bearing 14 to be tested, according to Newton's third law , the load that the radial hydraulic cylinder 17 acts on the outer ring of the bearing to be tested 14 is equal to the load that acts on the radial force sensor 18, so that the radial force sensor 18 can measure the diameter of the bearing to be tested 14 in real time during the test. to the load. Similarly, when the axial hydraulic cylinder 20 is loaded, the load acts on the side wall of the outer ring of the bearing to be tested 14 through the axial force column 19, and according to Newton's third law, the axial hydraulic cylinder 20 acts on the outer ring of the bearing to be tested 14 The load on the side wall is equal to the load acting on the axial load cell 21 , so that the axial load cell 21 can measure the axial load acting on the bearing 14 to be tested in real time during the test.

According to the size of the bearing 14 to be tested, the size of the ninth shoulder 39 of the support shaft 7, the size of the test bearing seat 15, and the size of the first step 41 of the axial force column 19 are selected; The shaft coupling 5 drives the support shaft 7 to rotate, thereby driving the bearing 14 to be tested installed on the ninth shoulder 39 of the support shaft 7 to rotate; the radial force acting on the bearing 14 to be tested by the radial loading structure passes through the support shaft 7 by the first The supporting bearing 8a and the second supporting bearing 8b are jointly borne, the axial force acting on the bearing 14 to be tested by the axial loading structure is borne by the second supporting bearing 8b through the supporting shaft 7, and the first supporting bearing 8a does not bear the application of the axial loading mechanism When the test is over, the bearing 14 to be tested needs to be unloaded from the ninth shoulder 39 of the support shaft 7. The unloading force is axial and is borne by the first support bearing 8a, and the second support bearing 8b does not bear the shaft The radial load cell 18 and the axial load cell 21 can display the loading load in real time, so that the radial hydraulic cylinder 17 and the axial hydraulic cylinder 20 can select the appropriate test load according to the user's needs when loading, and test at the same time The load is borne by the first support bearing 8a and the second support bearing 8b. The output end of the driving motor 4 does not need to install an additional reduction mechanism to increase the torque, and there is no need to change the speed according to a fixed reduction ratio. The speed can be adjusted by connecting an external frequency converter , when the user's requirement is the oil-immersed working condition, the specified type of oil can be filled in the oil tank 10 to provide test conditions for the bearings under different working conditions.

Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned advantageous modes can be freely combined and superimposed.

Claims (10)

1. The bearing accelerated life test bed is characterized by comprising a platform bottom plate (2), a driving structure, a supporting structure, an oil tank (10), an axial loading structure, a radial loading structure, an axial supporting structure body (23) and a bearing assembly to be tested;

the driving structure, the supporting structure, the oil tank (10) and the axial supporting structure body (23) are sequentially arranged on the platform bottom plate (2), the bearing assembly to be tested is arranged in the inner cavity of the oil tank (10), one end of the driving structure is connected with one end of the supporting structure, the other end of the supporting structure penetrates through the oil tank (10) to be connected with one end of the bearing assembly to be tested, one end of the axial loading structure is contacted with the other end of the bearing assembly to be tested, and the other end of the axial loading structure penetrates through the oil tank (10) to be connected with the axial supporting structure body (23) so that the axial loading structure can test the bearing assembly to be tested in the axial direction;

one end of the radial loading structure is connected with the platform bottom plate (2), and the other end of the radial loading structure passes through the oil tank (10) to be in contact with the lower end of the component to be tested, so that the radial loading structure can test the bearing component to be tested in the radial direction.

2. Bearing accelerated life test bench according to claim 1, characterized in that the support structure comprises a support shaft (7) and a bearing seat (9);

bearing frame (9) are connected with platform bottom plate (2), and back shaft (7) rotate the inner chamber that sets up at bearing frame (9), and the both ends of back shaft (7) run through bearing frame (9), and the one end and the drive structure of back shaft (7) are connected through shaft coupling (5), and the other end of back shaft (7) runs through oil tank (10) and is connected with the bearing assembly that awaits measuring.

3. The bearing accelerated life test stand of claim 2, wherein the support structure further comprises a lock nut (6), a first support bearing (8 a) and a second support bearing (8 b);

one side surface of the support shaft (7) is connected with the bearing seat (9) through a first support bearing (8 a), the other side surface of the support shaft (7) is connected with the bearing seat (9) through a second support bearing (8 b), a lock nut (6) is arranged on the outer surface of the support shaft (7) and close to the first support bearing (8 a), and one side wall of the lock nut (6) abuts against one side wall of the first support bearing (8 a).

4. The bearing accelerated life test stand according to claim 2, wherein the outer surface of the support shaft (7) is provided with a first shoulder (31), a second shoulder (32), a third shoulder (33), a fourth shoulder (34), a fifth shoulder (35), a sixth shoulder (36), a seventh shoulder (37), an eighth shoulder (38) and a ninth shoulder (39) in sequence;

the first shaft shoulder (31) of the support shaft (7) is connected with the shaft coupling (5), the outer surface of the third shaft shoulder (33) of the support shaft (7) is connected with the bearing seat (9) through the first support bearing (8 a), the lock nut (6) is arranged on the outer surface of the second shaft shoulder (32) of the support shaft (7), the outer surface of the fifth shaft shoulder (35) of the support shaft (7) is connected with the bearing seat (9) through the second support bearing (8 b), one side wall of the sixth shaft shoulder (36) of the support shaft (7) is contacted with the side wall of the bearing seat (9) so that the sixth shaft shoulder (36) is used for positioning the second support bearing (8 b), the seventh shaft shoulder (37) of the support shaft (7) penetrates through the oil tank (10), the seventh shaft shoulder (37) is connected with the oil tank (10) in a sealing mode, and the ninth shaft shoulder (39) of the support shaft (7) is connected with a bearing assembly to be tested.

5. The accelerated life test stand of bearings according to claim 4, characterized in that the bearing assembly to be tested comprises a bearing (14) to be tested and a test bearing seat (15);

the outer ring of the bearing (14) to be tested is arranged in the inner cavity of the test bearing seat (15), the test bearing seat (15) is arranged in the inner cavity of the oil tank (10), the outer surface of a ninth shaft shoulder (39) of the supporting shaft (7) is connected with the inner ring of the bearing (14) to be tested in an interference fit manner, the lower end surface of the test bearing seat (15) contacts with the radial loading structure, and the outer ring of the bearing (14) to be tested contacts with the axial loading structure.

6. The bearing accelerated life test stand of claim 5, wherein the axial loading structure comprises an axial force column (19), an axial hydraulic cylinder (20), an axial load cell (21), and an axial positioning cap (22);

one end of an axial force column (19) is installed in a test bearing seat (15), one end of the axial force column (19) is in contact with the outer ring side wall of a bearing (14) to be tested, an axial positioning cover (22) is connected with the side wall of an axial supporting structure body (23), an axial force sensor (21) is arranged in an inner cavity of the axial positioning cover (22), the axial force sensor (21) is connected with the axial supporting structure body (23), an axial hydraulic cylinder (20) is arranged in the inner cavity of the axial positioning cover (22) and is close to the axial force column (19), the other end of the axial force column (19) penetrates through an oil tank (10) to be in contact with the left side of the axial hydraulic cylinder (20), and the right side of the axial hydraulic cylinder (20) is in contact with the axial force sensor (21).

7. The bearing accelerated life test stand according to claim 6, wherein an axial force column first step (41), an axial force column second step (42) and an axial force column third step (43) are provided on an outer surface of the axial force column (19), and an axial positioning cover first step (51), an axial positioning cover second step (52) and an axial positioning cover third step (53) are provided on an outer surface of the axial positioning cover (22);

the first axial force column step (41) is arranged in the inner cavity of the test bearing seat (15), the side wall of the first axial force column step (41) is contacted with the outer ring side wall of the bearing (14) to be tested, the second axial force column step (42) penetrates through the oil tank (10), the second axial force column step (42) is in sealing connection with the oil tank (10), the third axial force column step (43) is arranged in the inner cavity of the first axial positioning cover step (51), and the third axial force column step (43) is contacted with the left side of the axial hydraulic cylinder (20);

the axial hydraulic cylinder (20) is arranged in the inner cavity of the first step (51) of the axial positioning cover, the axial force transducer (21) is arranged in the inner cavity of the second step (52) of the axial positioning cover, the axial force transducer (21) is connected with the axial supporting structure body (23), the right side of the axial hydraulic cylinder (20) is contacted with the left side of the axial force transducer (21), and the third step (53) of the axial positioning cover is connected with the axial supporting structure body (23).

8. Bearing accelerated life test stand according to claim 1, characterized in that the radial loading structure comprises a radial force column (16), a radial hydraulic cylinder (17) and a radial load cell (18);

radial force transducer (18) are connected with platform bottom plate (2), radial pneumatic cylinder (17) set up the top at radial force transducer (18), and the bottom surface of radial pneumatic cylinder (17) contacts the top setting with radial force transducer (18), radial force post (16) set up the top at radial pneumatic cylinder (17), and the bottom surface of radial force post (16) contacts the top setting with radial pneumatic cylinder (17), the upper end of radial force post (16) passes oil tank (10) and contacts with the bottom surface of test bearing frame (15), and sealing connection between radial force post (16) and oil tank (10).

9. The bearing accelerated life test stand according to claim 2, wherein the driving structure comprises a motor base (3) and a driving motor (4), the motor base (3) is mounted on the platform base plate (2), the driving motor (4) is mounted on the motor base (3), and the driving motor (4) is connected with one end of the supporting shaft (7) through a connecting coupler (5).

10. The bearing accelerated life test stand according to claim 1, wherein a plurality of platform floor anchor bolts (1) are uniformly provided on the lower surface of the platform floor (2), a plurality of oil tank anchor bolts (13) are uniformly provided on the lower surface of the oil tank (10), and the plurality of oil tank anchor bolts (13) are in contact with the upper surface of the platform floor (2).

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