Needle bearing fatigue life testing machine

Abstract

The invention discloses a needle bearing fatigue life testing machine, and relates to the technical field of life testing machines, and the needle bearing fatigue life testing machine comprises a workbench, the outer surface of the workbench is provided with a groove, the groove is internally provided with a load adjusting assembly used for applying a load to a needle bearing, and the load adjusting assembly comprises a round block; and eight uniformly arranged circular holes are formed in the outer surface of the circular block. According to the fatigue life testing machine for the needle bearing, the moving block is in contact with the needle bearing, the threaded rod is rotated, and different forces are applied to the first sliding block, so that the moving block applies different radial load forces to the needle bearing, and the reliability of a test result of the fatigue life testing machine for the needle bearing is improved.

Description

Technical Field

[0001] The invention relates to the technical field of life testing machines, in particular to a needle roller bearing fatigue life testing machine. Background Art

[0002] A life tester is a device used to evaluate how long products and components can continue to work under specific operating conditions until failure occurs. It simulates actual operating conditions and usually applies stresses that are more severe than normal use, accelerating the product's failure process, thereby evaluating its life and reliability in a shorter period of time.

[0003] Existing life testing machines apply radial loads to the outer surface of needle roller bearings during the test. The radial loads on the outer surface of the needle roller bearings are the same force at the same time. However, during the actual use of the needle roller bearings, the outer surface of the needle roller bearings will be subjected to different radial loads at the same time, which will reduce the reliability of the test results of the needle roller bearing fatigue life testing machine.

[0004] Therefore, we proposed a needle roller bearing fatigue life testing machine to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a needle roller bearing fatigue life testing machine to solve the problem proposed in the above background technology that the existing life testing machine applies the same radial load to the outer surface of the needle roller bearing, while the outer surface of the needle roller bearing will be subjected to different radial load forces at the same time during actual use, which will lead to a reduction in the reliability of the test results of the needle roller bearing fatigue life testing machine.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a needle roller bearing fatigue life testing machine, comprising: a workbench, a groove is provided on the outer surface of the workbench, an adjusting load assembly for applying a load to the needle roller bearing is arranged inside the groove, the adjusting load assembly comprises a round block, eight evenly arranged round holes are provided on the outer surface of the round block, four evenly arranged threaded holes are provided on the outer surface of the round block, the inner walls of the eight round holes are all slidably connected to a first sliding rod, the eight first sliding rods are grouped into two, and a moving block is fixedly connected between one end of each group of the first sliding rods, the inner walls of the four threaded holes are threadedly connected to threaded rods, the inner walls of the four threaded rods are provided with springs, and one end of the four springs is fixedly connected to the first slider.

[0007] Preferably, the other ends of the four springs are fixedly connected to the inner walls of the four threaded rods respectively, and the outer surfaces of the four first sliding blocks are slidably connected to the inner walls of the four threaded rods respectively.

[0008] Preferably, the inner walls of the four threaded rods are slidably connected to second sliding rods, one end of the four second sliding rods is provided with a first pressure sensor, and the outer surface of one side of the four first sliding blocks is respectively in contact with the outer surfaces of the four first pressure sensors.

[0009] Preferably, the other ends of the four second sliding rods are fixedly connected to the outer surfaces of the four moving blocks respectively, and a first sliding groove is provided on the outer surface of one side of the circular block.

[0010] Preferably, a first motor is provided on an outer surface of one side of the workbench, an output end of the first motor is fixedly connected to a first output shaft, and one end of the first output shaft is fixedly connected to a rotating shaft.

[0011] Preferably, a first fixed block is fixedly connected to the top of the workbench near one side edge of the groove, the outer surface of the rotating shaft is rotatably connected to the inner wall of the first fixed block, and a heating block is provided at one end of the rotating shaft.

[0012] Preferably, a second slider is fixedly connected to the inner wall of the groove, an outer surface of the second slider is slidably connected to the inner wall of the first sliding groove, and a tooth row is fixedly connected to the outer surface of the other side of the round block.

[0013] Preferably, a second fixed block is fixedly connected to the bottom of the workbench, a second motor is provided on the outer surface of the second fixed block, and a second output shaft is fixedly connected to the output end of the second motor.

[0014] Preferably, a gear is fixedly sleeved on the outer surface of the second output shaft, the outer surface of the gear is meshed with the outer surface of the gear row, and a third fixed block is fixedly connected to the bottom of the workbench near the edge of the groove, and the outer surface of the second output shaft is rotatably connected to the inner wall of the third fixed block.

[0015] Preferably, a hydraulic rod is provided on the outer surface of the other side of the workbench, one end of the hydraulic rod is fixedly connected to an axial load block, and the inner wall of the axial load block is provided with a second pressure sensor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This device applies different forces to the first slider by bringing the moving block into contact with the needle roller bearing and rotating the threaded rod, thereby causing the moving block to apply different radial loads to the needle roller bearing, thereby improving the reliability of the test results of the needle roller bearing fatigue life tester. It solves the problem that the existing life tester applies the same radial load to the outer surface of the needle roller bearing, while the outer surface of the needle roller bearing is subjected to different radial loads at the same time during actual use, thereby reducing the reliability of the test results of the needle roller bearing fatigue life tester. 2. This device is equipped with a heating block. The inner wall of the needle roller bearing is placed on the heating block to heat it up. Due to the principle of thermal expansion and contraction, the needle roller bearing will expand after being heated, so that the staff can easily put the needle roller bearing on the outer surface of the rotating shaft, ensuring the convenience of the needle roller bearing fatigue life testing machine when installing the needle roller bearing.

[0017] 3. This device drives the round block to rotate through the rotation of the gear, and then makes multiple moving blocks rotate along the outer surface of the needle roller bearing, applying different radial loads to multiple different outer surfaces of the needle roller bearing, and then performing all-round and multi-angle fatigue testing on the needle roller bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front perspective view of a needle roller bearing fatigue life testing machine according to the present invention; Figure 2 This is a three-dimensional diagram of the workbench portion of a needle roller bearing fatigue life testing machine of the present invention; Figure 3 A three-dimensional diagram of a gear row portion of a needle roller bearing fatigue life testing machine according to the present invention; Figure 4 A partial perspective view of a load adjustment component of a needle roller bearing fatigue life testing machine according to the present invention; Figure 5 This is a three-dimensional diagram of the threaded hole portion of a needle roller bearing fatigue life testing machine of the present invention; Figure 6 A three-dimensional diagram of a moving block portion of a needle roller bearing fatigue life testing machine according to the present invention; Figure 7 This is a sectional perspective view of the threaded rod structure of a needle roller bearing fatigue life testing machine of the present invention; Figure 8 This is a partial three-dimensional view of the axial load block of a needle roller bearing fatigue life testing machine of the present invention.

[0019] In the picture: 1. Workbench; 2. Groove; 3. Adjustable load assembly; 301. Round block; 302. Round hole; 303. Threaded hole; 304. First slide bar; 305. Moving block; 306. Threaded rod; 307. Spring; 308. First slider; 309. Second slider; 310. First pressure sensor; 311. First slide groove; 4. First motor; 5. First output shaft; 6. Rotating shaft; 7. First fixed block; 8. Heating block; 9. Second slider; 10. Gear row; 11. Second fixed block; 12. Second motor; 13. Second output shaft; 14. Gear; 15. Third fixed block; 16. Hydraulic rod; 17. Axial load block; 18. Second pressure sensor. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figure 1-8 The present invention provides a technical solution: a needle roller bearing fatigue life testing machine, comprising a workbench 1, a groove 2 is provided on the outer surface of the workbench 1, an adjusting load component 3 for applying a load to the needle roller bearing is arranged inside the groove 2, the adjusting load component 3 comprises a round block 301, eight evenly arranged round holes 302 are provided on the outer surface of the round block 301, four evenly arranged threaded holes 303 are provided on the outer surface of the round block 301, the inner walls of the eight round holes 302 are all slidably connected with first sliding rods 304, the eight first sliding rods 304 are grouped into two, one end of each group of first sliding rods 304 is fixedly connected with a moving block 305, the inner walls of the four threaded holes 303 are all threadedly connected with threaded rods 306, the inner walls of the four threaded rods 306 are all provided with springs 307, and one end of the four springs 307 is fixedly connected with The first slider 308 and the other ends of the four springs 307 are respectively fixedly connected to the inner walls of the four threaded rods 306, the outer surfaces of the four first sliders 308 are respectively slidably connected to the inner walls of the four threaded rods 306, the inner walls of the four threaded rods 306 are all slidably connected with the second sliders 309, one end of the four second sliders 309 is respectively provided with a first pressure sensor 310, the outer surfaces of one side of the four first sliders 308 are in contact with the outer surfaces of the four first pressure sensors 310, the other ends of the four second sliders 309 are respectively fixedly connected to the outer surfaces of the four moving blocks 305, a first sliding groove 311 is provided on the outer surface of one side of the round block 301, and a first motor 4 is provided on the outer surface of one side of the workbench 1, the output end of the first motor 4 is fixedly connected to the first output shaft 5, and one end of the first output shaft 5 is fixedly connected to the rotating shaft 6.

[0022] In this embodiment, when the needle roller bearing fatigue life testing machine is in operation, the staff needs to sleeve the inner wall of the needle roller bearing on the outer surface of the rotating shaft 6. At this time, the outer surface of the needle roller bearing is in contact with the outer surface of the four moving blocks 305. When the outer surface of the needle roller bearing is in contact with the outer surface of the moving block 305, the needle roller bearing will squeeze the outer surface of the moving block 305. When the moving block 305 is squeezed, it will drive the outer surface of the connected first sliding rod 304 to slide along the inner wall of the circular hole 302, and at the same time drive the outer surface of the second sliding rod 309 to slide along the inner wall of the threaded rod 306. When the second sliding rod 309 slides, it will drive the first pressure sensor 31 0 moves, the first pressure sensor 310 will drive the outer surface of the first slider 308 to slide along the inner wall of the threaded rod 306 to squeeze the spring 307. After the needle bearing is installed on the outer surface of the rotating shaft 6, the staff can rotate the threaded rod 306. The threaded rod 306 will drive the spring 307 to rotate during the rotation. The spring 307 will drive the first slider 308 to rotate under the action of its own elastic force. The threaded rod 306 will rotate along the outer surface of the second slide bar 309 and at the same time drive the outer surface of the first slide bar 304 to slide along the inner wall of the circular hole 302. Since the outer surface of the moving block 305 has been in contact with the outer surface of the needle bearing, The spring 307 fits in place, so when the threaded rod 306 rotates along the threaded hole 303, the moving block 305 will squeeze the spring 307, and the elastic force of the spring 307 itself will apply the squeezing force to the first slider 308. The force exerted on the first slider 308 will be exerted on the first pressure sensor 310 and the second slide bar 309. The force exerted on the second slide bar 309 will be transmitted to the moving block 305, thereby driving the moving block 305 to apply a radial load to the outer surface of the needle roller bearing. By rotating the threaded rod 306 at different distances, different radial loads will be applied to the outer surface of the needle roller bearing. Through the contact between the moving block 305 and the outer surface of the needle roller bearing, the staff can By rotating the threaded rod 306, the threaded rod 306 will drive the spring 307 to apply different forces to the first slider 308. The force applied to the first slider 308 will act on the second slider 309 through the first pressure sensor 310, and then act on the moving block 305 through the second slider 309, so that the moving block 305 will apply different radial loads to the needle roller bearing. This solves the problem that most existing life testing machines apply the same force when applying radial loads to the outer surface of the needle roller bearing, while the outer surface of the needle roller bearing will be subjected to different radial loads at the same time during actual use, which will reduce the reliability of the test results of the needle roller bearing fatigue life testing machine.

[0023] like Figure 1-8As shown, a first fixed block 7 is fixedly connected to the top of the workbench 1 near the edge of one side of the groove 2, the outer surface of the rotating shaft 6 is rotatably connected to the inner wall of the first fixed block 7, and a heating block 8 is provided at one end of the rotating shaft 6.

[0024] In this embodiment, when the staff needs to install the inner wall of the needle roller bearing with the outer surface of the rotating shaft 6, the inner wall of the needle roller bearing and the rotating shaft 6 are usually installed in an interference fit manner. Interference fit refers to the assembly of mechanical parts in which the size of the inner ring and the inner part is larger than the size of the outer ring and the outer part. During assembly, a certain pressure needs to be applied and the outer ring and the inner part need to be heated to cause elastic deformation of the inner and outer parts, thereby achieving a tight connection. At this time, the staff needs to first place the inner wall of the needle roller bearing on the outer surface of the heating block 8 and start the heating block 8 to increase the temperature of the needle roller bearing itself. When the temperature of the needle roller bearing rises, its own material will expand, so that the inner wall of the needle roller bearing can be easily sleeved on the outer surface of the rotating shaft 6. When the temperature of the needle roller bearing drops, its own material will shrink, so that the inner wall of the needle roller bearing and the outer surface of the rotating shaft 6 are tightly connected. By first placing the inner wall of the needle roller bearing on the heating block 8 for heating, the needle roller bearing will expand after being heated according to the principle of thermal expansion and contraction, so that the staff can easily sleeve the needle roller bearing on the outer surface of the rotating shaft 6, ensuring the convenience of the needle roller bearing fatigue life testing machine when installing needle roller bearings.

[0025] like Figure 1-8 As shown, the inner wall of the groove 2 is fixedly connected with a second slider 9, the outer surface of the second slider 9 is slidably connected to the inner wall of the first slide groove 311, the outer surface of the other side of the round block 301 is fixedly connected with a gear row 10, the bottom of the workbench 1 is fixedly connected with a second fixed block 11, the outer surface of the second fixed block 11 is provided with a second motor 12, the output end of the second motor 12 is fixedly connected with a second output shaft 13, the outer surface of the second output shaft 13 is fixedly sleeved with a gear 14, the outer surface of the gear 14 is meshed with the outer surface of the gear row 10, the bottom of the workbench 1 is fixedly connected with a third fixed block 15 near the edge of the groove 2, the outer surface of the second output shaft 13 is rotatably connected to the inner wall of the third fixed block 15, and the outer surface of the other side of the workbench 1 is provided with a hydraulic rod 16, one end of the hydraulic rod 16 is fixedly connected to an axial load block 17, and the inner wall of the axial load block 17 is provided with a second pressure sensor 18.

[0026] In this embodiment, during the operation of the needle roller bearing fatigue life testing machine, after the needle roller bearing is sleeved on the outer surface of the rotating shaft 6, the load adjustment component 3 is started to apply different radial load forces on the outer surface of the needle roller bearing, and the first motor 4 is started. The first motor 4 will drive the first output shaft 5 to rotate, and the first output shaft 5 will drive the rotating shaft 6 to rotate, and the rotating shaft 6 will drive the needle roller bearing to rotate. At the same time, the hydraulic rod 16 is started, and the hydraulic rod 16 will drive the axial load block 17 to apply an axial load to the needle roller bearing. When the radial load force on the outer surface of the needle roller bearing needs to be changed while the needle roller bearing is rotating, the staff can start the second motor 12, and the second motor 12 will drive the second output shaft 13 to rotate, and the second output shaft 13 will drive the gear When the wheel 14 rotates, the gear 14 will drive the gear row 10 to rotate. When the gear row 10 rotates, it will drive the round block 301 to rotate. The round block 301 will drive multiple moving blocks 305 to rotate around the outer surface of the needle roller bearing, thereby changing the distribution of radial load force on the outer surface of the needle roller bearing. After the multiple moving blocks 305 are rotated to the appropriate position, the second motor 12 is stopped. This device is provided with a second motor 12. The second motor 12 will drive the round block 301 to rotate. The rotation of the round block 301 will drive multiple moving blocks 305 to rotate along the outer surface of the needle roller bearing, thereby changing the radial load force applied to multiple different angles of the outer surface of the needle roller bearing, thereby enabling all-round and multi-angle fatigue testing of the needle roller bearing.

[0027] The usage and working principle of this device: When the needle roller bearing fatigue life testing machine is in operation, the staff needs to place the inner wall of the needle roller bearing on the outer surface of the heating block 8, start the heating block 8, so that the temperature of the needle roller bearing itself increases, and its own material will expand, so that the inner wall of the needle roller bearing can be easily sleeved on the outer surface of the rotating shaft 6. When the temperature of the needle roller bearing drops, the inner wall of the needle roller bearing is tightly connected to the outer surface of the rotating shaft 6. When the outer surface of the needle roller bearing contacts the outer surface of the moving block 305, it will squeeze the moving block 305. The staff rotates the threaded rod 306. The rotation of the threaded rod 306 will drive the moving block 305 to squeeze the spring 307. The elastic force of the spring 307 itself will apply the squeezing force to the moving block 305, thereby driving the moving block 305 to apply a radial load to the outer surface of the needle roller bearing. By rotating the threaded rod 306 at different distances, different radial loads are applied to the outer surface of the needle bearing. After the needle bearing is sleeved on the outer surface of the rotating shaft 6, the first motor 4 is started, the first motor 4 drives the rotating shaft 6 to rotate, and the rotating shaft 6 drives the needle bearing to rotate. At the same time, the hydraulic rod 16 is started, and the hydraulic rod 16 drives the axial load block 17 to apply an axial load to the needle bearing. When the radial load on the outer surface of the needle bearing needs to be changed while the needle bearing is rotating, the second motor 12 can be started, the second motor 12 drives the gear 14 to rotate, and the gear 14 drives the gear row 10 to rotate. When the gear row 10 rotates, it drives multiple moving blocks 305 to rotate around the outer surface of the needle bearing, thereby changing the distribution of the radial load on the outer surface of the needle bearing. After the multiple moving blocks 305 are rotated to the appropriate position, the second motor 12 is stopped.

[0028] The wiring diagram of the first pressure sensor, the first motor, the heating block, the second motor, the hydraulic rod and the second pressure sensor in the present invention is common knowledge in the field, and its working principle is a well-known technology. The model is selected according to the actual use, so the control method and wiring arrangement of the first pressure sensor, the first motor, the heating block, the second motor, the hydraulic rod and the second pressure sensor will not be explained in detail.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A needle roller bearing fatigue life testing machine, comprising a workbench (1), wherein the outer surface of the workbench (1) is provided with a groove (2), and an adjusting load component (3) for applying a load to the needle roller bearing is provided inside the groove (2), characterized in that: The load regulating assembly (3) comprises a round block (301), the outer surface of the round block (301) is provided with eight evenly arranged round holes (302), the outer surface of the round block (301) is provided with four evenly arranged threaded holes (303), the inner walls of the eight round holes (302) are all slidably connected to first sliding rods (304), the eight first sliding rods (304) form a group of two, and one end of each group of the first sliding rods (304) is fixedly connected to a moving block (305), the inner walls of the four threaded holes (303) are all threadedly connected to threaded rods (306), the inner walls of the four threaded rods (306) are all provided with springs (307), and one end of the four springs (307) is fixedly connected to a first sliding block (308).

2. The needle roller bearing fatigue life testing machine according to claim 1, characterized in that: The other ends of the four springs (307) are fixedly connected to the inner walls of the four threaded rods (306), and the outer surfaces of the four first sliding blocks (308) are slidably connected to the inner walls of the four threaded rods (306).

3. The needle roller bearing fatigue life testing machine according to claim 2, characterized in that: The inner walls of the four threaded rods (306) are slidably connected to second slide bars (309), one end of each of the four second slide bars (309) is provided with a first pressure sensor (310), and one side outer surface of the four first sliding blocks (308) is in contact with the outer surfaces of the four first pressure sensors (310) respectively.

4. The needle roller bearing fatigue life testing machine according to claim 3, characterized in that: The other ends of the four second sliding rods (309) are fixedly connected to the outer surfaces of the four moving blocks (305), respectively. A first sliding groove (311) is provided on the outer surface of one side of the circular block (301).

5. The needle roller bearing fatigue life testing machine according to claim 4, characterized in that: A first motor (4) is provided on an outer surface of one side of the workbench (1); an output end of the first motor (4) is fixedly connected to a first output shaft (5); and one end of the first output shaft (5) is fixedly connected to a rotating shaft (6).

6. The needle roller bearing fatigue life testing machine according to claim 5, characterized in that: A first fixed block (7) is fixedly connected to the top of the workbench (1) near the edge of one side of the groove (2), the outer surface of the rotating shaft (6) is rotatably connected to the inner wall of the first fixed block (7), and a heating block (8) is provided at one end of the rotating shaft (6).

7. The needle roller bearing fatigue life testing machine according to claim 6, characterized in that: The inner wall of the groove (2) is fixedly connected to a second slider (9), the outer surface of the second slider (9) is slidably connected to the inner wall of the first slide groove (311), and the outer surface of the other side of the round block (301) is fixedly connected to a tooth row (10).

8. The needle roller bearing fatigue life testing machine according to claim 7, characterized in that: A second fixed block (11) is fixedly connected to the bottom of the workbench (1), a second motor (12) is provided on the outer surface of the second fixed block (11), and a second output shaft (13) is fixedly connected to the output end of the second motor (12).

9. The needle roller bearing fatigue life testing machine according to claim 8, characterized in that: The outer surface of the second output shaft (13) is fixedly sleeved with a gear (14), and the outer surface of the gear (14) is meshed with the outer surface of the gear row (10). A third fixing block (15) is fixedly connected to the bottom of the workbench (1) near the edge of the groove (2), and the outer surface of the second output shaft (13) is rotatably connected to the inner wall of the third fixing block (15).

10. The needle roller bearing fatigue life testing machine according to claim 9, characterized in that: A hydraulic rod (16) is provided on the outer surface of the other side of the workbench (1), one end of the hydraulic rod (16) is fixedly connected to an axial load block (17), and a second pressure sensor (18) is provided on the inner wall of the axial load block (17).

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