Vehicle bearing axial vibration detection device and detection method

Abstract

The invention discloses a vehicle bearing axial vibration detection device and detection method. The detection device comprises a main shaft box body; the driving main shaft is connected with the main shaft box body, and a measuring coil is arranged on the inner side of the driving main shaft; the measuring main shaft is sleeved with the driving main shaft, and a permanent magnet is arranged at one end, close to the measuring coil, of the measuring main shaft; and the measured bearing comprises a bearing inner ring, and the bearing inner ring abuts against the measuring main shaft. The axial movement of the measured bearing is measured through the electromagnetic induction principle, all point positions of the measured bearing can be comprehensively measured, meanwhile, the high efficiency of measurement is ensured, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts, and particularly to an axial vibration detection device and method for vehicle bearings. Background Art

[0002] As one of the key components of an automobile, the stability and reliability of vehicle bearings are directly related to the overall performance and use safety of the vehicle. In modern automobiles, with the complication of vehicle driving conditions and the continuous increase in driving mileage, the performance requirements for bearings are getting higher and higher. And the vibration value generated during the rotation of the bearing is an important indicator for evaluating the dynamic performance of the bearing. Currently, the commonly used method for measuring the bearing vibration value is to drive the inner ring of the bearing, apply an axial load to the outer ring of the bearing to make it non-rotating, pick up the radial vibration signal of the outer ring of the bearing by a sensor, and transmit it to an electronic measuring instrument, which displays the vibration value of the bearing. This measurement method has a simple implementation method and good adaptability to the type and size of bearings, but there are two deficiencies. One is that when measuring the radial vibration of the outer ring of the bearing, since the sensor is placed at a radial point on the outer surface of the outer ring of the bearing, if the defect of the outer ring of the bearing is not within a small working area directly below the signal pickup point of the sensor, it is very difficult to be detected, so the detection rate of outer ring defects is relatively low. If the detection rate of outer ring defects is to be improved, multi-point measurement along the circumferential direction of the outer ring of the bearing is required, but multi-point measurement will affect the work efficiency, especially during automated on-line detection, the test beat is very important because it must meet the efficiency of the entire production line. The other is that when the bearing rotates, an oil film will be generated on the raceways of the inner and outer rings. The vibration generated by the defect of the inner ring of the bearing needs to be transmitted to the outer ring through the oil film and rolling elements. Inevitably, the vibration attenuation is caused during the transmission process, reducing the sensitivity of detecting the defect of the inner ring of the bearing. Therefore, it is very necessary to provide a reliable axial vibration detection device and method for vehicle bearings. Summary of the Invention

[0003] The present invention aims to solve at least one of the above technical problems.

[0004] The first object of the present invention is to provide an axial vibration detection device for vehicle bearings.

[0005] The second object of the present invention is to provide an axial vibration detection method for vehicle bearings.

[0006] To achieve the first object of the present invention, the present invention provides an axial vibration detection device for vehicle bearings, which includes: a main shaft housing; a driving main shaft, the driving main shaft is connected to the main shaft housing, and a measuring coil is provided inside the driving main shaft; a measuring main shaft, the measuring main shaft is sleeved on the driving main shaft, and a permanent magnet is provided at one end of the measuring main shaft close to the measuring coil; a measured bearing, the measured bearing includes a bearing inner ring, and the bearing inner ring abuts against the measuring main shaft.

[0007] By driving the main shaft to drive the measuring main shaft to rotate, the measuring main shaft drives the inner ring of the bearing to rotate. When the inner ring of the bearing rotates, axial vibration will be generated. The axial vibration of the inner ring of the bearing acts on the measuring main shaft, and the measuring main shaft will generate the same axial vibration accordingly. The permanent magnet on the measuring main shaft also generates the same axial vibration, which further causes the permanent magnet to reciprocate in the measuring coil, generating an induced electromotive force. The induced electromotive force generated by the measuring coil is measured by an external sensor, and then according to the coil length, the number of turns of the coil, and using a fluxmeter to measure the magnetic induction intensity, the axial movement speed of the permanent magnet is calculated based on the induced electromotive force, the coil length, the magnetic induction intensity, and the number of turns of the coil. Through the technology with the application number of CN116878879A previously applied by the applicant, the axial movement value of the inner ring of the bearing can be obtained through the axial movement speed, analyze and measure this vibration value, evaluate the bearing quality, and find the position of the bearing defect. This device realizes non-contact axial vibration detection through the measuring coil and the permanent magnet, avoiding direct contact with the bearing, reducing wear and damage to the bearing, and improving the safety and reliability of detection.

[0008] In the above technical solution, a shaft core is provided at one end of the measuring main shaft close to the bearing to be measured, and the shaft core abuts against the inner ring of the bearing.

[0009] Through the direct contact between the shaft core and the inner ring of the bearing, good contact stability can be ensured between the measuring main shaft and the bearing to be measured. This direct contact helps to transmit axial vibration more accurately and reduce measurement errors caused by unstable contact. The close contact between the shaft core and the inner ring of the bearing can ensure that axial vibration can be transmitted to the measuring main shaft more directly and accurately. In this way, attenuation and distortion during vibration transmission can be reduced, and the accuracy of the detection result can be improved. The design of the shaft core simplifies the overall structure of the device, reduces unnecessary complexity, makes the device more compact and easy to install. This simplified design not only improves the reliability and maintainability of the device, but also reduces production costs. Through the contact between the shaft core and the inner ring of the bearing, axial vibration can be transmitted more effectively, enhancing the efficiency of mechanical transmission. This design helps to ensure that the vibration signal can be transmitted to the measuring coil accurately and completely, thereby improving the effectiveness of detection.

[0010] In any of the above technical solutions, a shock isolation pad is provided at one end of the shaft core close to the driving main shaft, and the shock isolation pad abuts against the driving main shaft.

[0011] The seismic isolation pad has good shock absorption and seismic isolation performance, which can effectively reduce the vibration transmitted from the driving spindle to the measuring spindle. This design can avoid the influence of external vibration on the measuring spindle and improve the accuracy and stability of the detection results. By reducing the vibration transmitted by the driving spindle, it can be ensured that the vibration of the measuring spindle mainly comes from the bearing under test rather than other external factors. This design helps to improve the detection accuracy and ensure more reliable detection results. Through the shock absorption effect of the seismic isolation pad, it can be ensured that the vibration signal received by the measuring coil is purer and more accurate, thereby optimizing the response of the sensor, improving the detection sensitivity, and at the same time avoiding the vibration of the shaft core being transmitted to the driving spindle, causing the measuring coil to vibrate and affecting the final detection result, and improving the accuracy of the detection result.

[0012] In any of the above technical solutions, the measuring spindle is provided with several rings, and the rings are abutted against the driving spindle.

[0013] The interference fit press-in of the ring and the driving spindle ensures the contact stability between the two. This close contact helps to transmit torque and vibration more accurately and reduces measurement errors caused by unstable contact. Through the interference fit press-in ring, it can be ensured that the contact between the driving spindle and the measuring spindle is closer, thereby improving the transmission efficiency. This design helps to reduce energy loss and ensure that the measuring spindle can rotate more efficiently following the driving spindle. The close contact between the ring and the driving spindle has a certain vibration isolation effect, which can reduce the vibration transmitted from the driving spindle to the measuring spindle. This design helps to isolate external vibration and improve the accuracy of the detection results.

[0014] In any of the above technical solutions, the detection device further includes a bearing retaining ring, the bearing under test further includes an outer bearing ring, and the bearing retaining ring is abutted against the outer bearing ring.

[0015] The close contact between the bearing retaining ring and the outer bearing ring can ensure the contact stability between the two and reduce measurement errors caused by unstable contact. By pressing the outer bearing ring with the bearing retaining ring, the axial fixity of the bearing under test can be effectively enhanced, ensuring that the position of the bearing under test does not change during the detection process, thereby improving the detection accuracy. The pressing mechanism can reduce the influence of external vibration on the bearing under test and ensure that the bearing under test is in a stable state, further improving the reliability of the detection results. Through the pressing mechanism, it can be ensured that the axial vibration transmission of the bearing under test is more uniform and stable, thereby improving the detection accuracy and ensuring more accurate detection results. And, pressing the outer bearing ring can ensure that while the bearing under test remains stable, the axial vibration generated by the rotation of the inner bearing ring will not be suppressed, so that the final detection result is not affected.

[0016] In any of the above technical solutions, the spindle housing is provided with a copper bushing, and the copper bushing is sleeved on the driving spindle.

[0017] The copper sleeve has good wear resistance, which can reduce the wear between the driving spindle and the spindle housing. The use of the copper sleeve can extend the service life of the spindle housing and the driving spindle. Copper has good thermal conductivity and can effectively dissipate heat. The copper sleeve can quickly conduct the heat generated by friction out, preventing the temperature rise caused by heat accumulation, thereby protecting the driving spindle and the spindle housing. The vibration damping effect and good friction characteristics of the copper sleeve can reduce the noise during operation and improve the overall running quietness of the detection device. The copper sleeve can play a certain buffering role to protect the driving spindle from hard impacts and reduce the damage caused by impacts. The installation and maintenance of the copper sleeve are relatively simple, which can reduce the maintenance cost and time. The copper sleeve can usually solve the wear problem by replacement without having to replace the entire spindle housing.

[0018] In any of the above technical solutions, the driving spindle is provided with an axial thrust ring and a skeleton oil seal. The axial thrust ring abuts against the copper sleeve, and the skeleton oil seal abuts against the axial thrust ring.

[0019] The axial thrust ring abuts against the copper sleeve, which can effectively enhance the axial fixation of the spindle, ensure that the spindle does not move axially during operation, and thus improve the stability and accuracy of detection. The contact surface between the axial thrust ring and the copper sleeve can reduce the wear between the spindle and the spindle housing. The existence of the axial thrust ring can disperse the frictional force and reduce the wear caused by single-point contact. The skeleton oil seal abuts against the axial thrust ring, which can form an effective sealing effect, prevent the leakage of lubricating oil, and at the same time prevent external impurities from entering the inside of the spindle, maintaining the cleanliness and stability of the internal lubrication system. The combined use of the axial thrust ring and the skeleton oil seal can effectively reduce the vibration and noise during the operation of the spindle. The elasticity of the axial thrust ring can absorb part of the vibration, and the good sealing performance of the skeleton oil seal can reduce the generation of noise.

[0020] In any of the above technical solutions, the detection device further includes an axial locking nut, and the axial locking nut is connected to the driving spindle.

[0021] The axial locking nut is connected to the driving spindle by means of a threaded connection, which can further enhance the axial fixation of the driving spindle, ensure that the spindle does not move axially during operation, and thus improve the stability and accuracy of detection. The axial locking nut can achieve the axial positioning of the spindle by adjusting the tightness, which is convenient for accurately adjusting the position of the spindle during assembly and maintenance to ensure that all components can be correctly aligned and matched. Through the fastening effect of the locking nut, it can effectively prevent the driving spindle from loosening due to vibration and other reasons during long-term use, ensuring the fixation and reliability of the spindle.

[0022] In any of the above technical solutions, the detection device further includes a pulley, and the pulley is connected to the axial locking nut.

[0023] The pulley is rotated to drive the axial locking nut, which in turn drives the driving main shaft to rotate, thereby achieving the effect of starting the device. The pulley is connected to the driving main shaft through the axial locking nut, which can ensure the stable fixation of the pulley in the axial direction. This reduces looseness and displacement caused by vibration or impact, and improves the stability of the overall system. By firmly connecting the pulley, the overall reliability of the detection device can be significantly enhanced, reducing faults and errors caused by looseness and extending the service life of the equipment. The axial locking nut ensures the precise alignment between the pulley and the driving main shaft, which is particularly important in applications with high-speed operation and high-precision detection requirements.

[0024] To achieve the second object of the present invention, the present invention provides a method for detecting axial vibration of a vehicle bearing, which is implemented by the vehicle bearing axial vibration detection device in any of the above technical solutions. The detection method includes: Step S110: Apply pressure to the outer ring of the bearing through the bearing retaining ring; Step S120: Rotate the axial locking nut by driving the pulley, the axial locking nut drives the driving main shaft to rotate, the driving main shaft drives the measuring main shaft to rotate, the measuring main shaft drives the shaft core to rotate, and the shaft core drives the inner ring of the bearing to rotate; Step S130: When the inner ring of the bearing rotates, axial vibration is generated, and the axial vibration is transmitted to the measuring main shaft through the shaft core. The permanent magnet on the measuring main shaft moves in the measuring coil due to the axial vibration; Step S140: Measure the induced electromotive force of the coil by the sensor, measure the magnetic induction intensity by the fluxmeter, and calculate the axial vibration speed of the permanent magnet through the induced electromotive force of the coil, the magnetic induction intensity, the coil length, and the number of turns of the coil. The axial vibration speed of the permanent magnet is the same as the axial vibration speed of the measured bearing; Step S150: Obtain the axial vibration value of the measured bearing from the axial vibration speed, analyze the axial vibration value of the measured bearing, and judge the defect position of the measured bearing.

[0025] By rotating to simulate the normal use of the measured bearing, and closely conducting measurements at multiple locations on the axial vibration value generated by the inner ring of the bearing, the defect position of the measured bearing is judged by analyzing the axial vibration value, achieving the effect of precise measurement. This method can comprehensively measure all points of the measured bearing while ensuring high measurement efficiency and improving work efficiency by simulating the normal use of the measured bearing and measuring the axial movement of the measured bearing through the principle of electromagnetic induction. And by pressing the outer ring of the bearing, it can ensure the stability of the measured bearing while the axial vibration generated by the rotation of the inner ring of the bearing will not be suppressed, thereby avoiding the attenuation of vibration and improving the reliability of the detection result. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will discuss the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings.

[0027] Figure 1 It is a schematic diagram of an axial vibration detection device for a vehicle bearing provided by an embodiment of the present invention.

[0028] Figure 2 It is another schematic diagram of an axial vibration detection device for a vehicle bearing provided by an embodiment of the present invention.

[0029] Figure 3 It is a flowchart of an axial vibration detection method for a vehicle bearing provided by an embodiment of the present invention.

[0030] In the figure: 100 - main shaft housing, 110 - copper bushing, 200 - driving main shaft, 210 - measuring coil, 220 - axial thrust ring, 230 - skeleton oil seal, 300 - measuring main shaft, 310 - permanent magnet, 320 - shaft core, 321 - vibration isolation pad, 330 - race, 400 - bearing to be measured, 410 - bearing inner ring, 420 - bearing outer ring, 500 - bearing retaining ring, 610 - axial locking nut, 620 - pulley. Detailed Embodiments

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0032] As Figure 1 、 Figure 2As shown in the figure, an embodiment of the present invention provides a spindle housing 100; a driving spindle 200, the driving spindle 200 is connected to the spindle housing 100, and a measuring coil 210 is provided inside the driving spindle 200; a measuring spindle 300, the measuring spindle 300 is sleeved on the driving spindle 200, and a permanent magnet 310 is provided at one end of the measuring spindle 300 close to the measuring coil 210; a measured bearing 400, the measured bearing 400 includes a bearing inner ring 410, and the bearing inner ring 410 abuts against the measuring spindle 300; a shaft core 320 is provided at one end of the measuring spindle 300 close to the measured bearing 400, and the shaft core 320 abuts against the bearing inner ring 410; a shock isolation pad 321 is provided at one end of the shaft core 320 close to the driving spindle 200, and the shock isolation pad 321 abuts against the driving spindle 200; several ferrules 330 are provided on the measuring spindle 300, and the ferrules 330 abut against the driving spindle 200; a bearing retaining ring 500, the measured bearing 400 further includes a bearing outer ring 420, and the bearing retaining ring 500 abuts against the bearing outer ring 420; a copper bushing 110 is provided on the spindle housing 100, and the copper bushing 110 is sleeved on the driving spindle 200; an axial thrust ring 220 and a skeleton oil seal 230 are provided on the driving spindle 200, the axial thrust ring 220 abuts against the copper bushing 110, and the skeleton oil seal 230 abuts against the axial thrust ring 220; an axial locking nut 610, the axial locking nut 610 is connected to the driving spindle 200; a pulley 620, the pulley 620 is connected to the axial locking nut 610.

[0033] In this embodiment, the main shaft housing 100 is fixed on the frame flat plate to maintain stability. A copper sleeve 110 is fixed inside the main shaft housing 100. The driving main shaft 200 is sleeved inside the copper sleeve 110. Axial thrust rings 220 are arranged at both ends of the copper sleeve 110. Lubricating oil is injected between the copper sleeve 110, the driving main shaft 200 and the axial thrust rings 220 before using the device. A skeleton oil seal 230 is arranged on the outer side of the axial thrust rings 220 to seal it, prevent lubricating oil from leaking, and at the same time protect the inside from being invaded by external dust and the like. A measuring main shaft 300 is sleeved inside the driving main shaft 200. Three collars 330 are arranged on the outer side of the measuring main shaft 300. The collars 330 are press-fitted into the inside of the driving main shaft 200 with an interference fit. The collars 330 can increase the friction between the measuring main shaft 300 and the inside of the driving main shaft 200, ensure that the driving main shaft 200 can drive the measuring main shaft 300 to rotate, and can prevent relative sliding between the driving main shaft 200 and the measuring main shaft 300. A shaft core 320 is arranged at the left end of the measuring main shaft 300. The shaft core 320 abuts against the inner ring 410 of the bearing. A shock isolation pad 321 is arranged on the side of the shaft core 320 close to the driving main shaft 200 to prevent the vibration of the shaft core 320 from affecting the driving main shaft 200, or the vibration of the driving main shaft 200 from affecting the shaft core 320. A bearing pressing ring 500 is arranged on the left side of the measured bearing 400. The bearing pressing ring 500 abuts against the outer ring 420 of the measured bearing 400. Applying pressure to the bearing pressing ring 500 can stabilize the measured bearing 400. A permanent magnet 310 is arranged on the right side of the measuring main shaft 300. A measuring coil 210 is arranged inside the driving main shaft 200. When the permanent magnet 310 vibrates axially, the permanent magnet 310 moves inside the measuring coil 210. An axial locking nut 610 is sleeved on the right side of the driving main shaft 200. A pulley 620 is sleeved on the outer side of the axial locking nut 610. The pulley 620 rotates to drive the axial locking nut 610, and then drives the driving main shaft 200 to rotate.When the device is in use, pressure is applied to the bearing retaining ring 500 to compress the outer ring 420 of the bearing. Then, the pulley 620 rotates to drive the axial locking nut 610, which in turn drives the drive spindle 200 to rotate. The drive spindle 200 drives the measuring spindle 300 to rotate, and the measuring spindle 300 drives the inner ring 410 of the bearing to rotate through the shaft core 320, thus simulating the scenario of bearing use. At this time, the inner ring 410 of the bearing undergoes axial vibration, and the axial vibration of the inner ring 410 of the bearing is transmitted to the measuring spindle 300. The permanent magnet 310 on the measuring spindle 300 undergoes axial vibration, so it moves inside the measuring coil 210. The measuring coil 210 achieves the effect of cutting the magnetic induction line. Also, because E = NBLV, where E is the induced electromotive force, B is the magnetic induction intensity, L is the coil length, and N is the number of turns of the coil. Therefore, by measuring the induced electromotive force E of the coil with a sensor and measuring the magnetic induction intensity B with a fluxmeter, the axial vibration speed of the permanent magnet 310 can be calculated. The axial vibration speed of the permanent magnet 310 is the vibration speed of the inner ring 410 of the bearing. Through the technology of the applicant's prior application, the axial vibration value of the bearing can be obtained, and by analyzing this vibration value, the bearing quality can be judged and the defect location of the bearing can be found.

[0034] As Figure 3 shown, an embodiment of the present invention provides a method for detecting the axial vibration of a vehicle bearing, which is implemented by the vehicle bearing axial vibration detection device in the above embodiment. The detection method includes: S110: Apply pressure to the outer ring 420 of the bearing through the bearing retaining ring 500; S120: Drive the axial locking nut 610 to rotate through the pulley 620. The axial locking nut 610 drives the drive spindle 200 to rotate, the drive spindle 200 drives the measuring spindle 300 to rotate, the measuring spindle 300 drives the shaft core 320 to rotate, and the shaft core 320 drives the inner ring 410 of the bearing to rotate; S130: When the inner ring 410 of the bearing rotates, axial vibration is generated, and the axial vibration is transmitted to the measuring spindle 300 through the shaft core 320. The permanent magnet 310 on the measuring spindle 300 moves inside the measuring coil 210 through axial vibration; S140: Measure the induced electromotive force of the coil with a sensor, measure the magnetic induction intensity with a fluxmeter, and calculate the axial vibration speed of the permanent magnet 310 through the induced electromotive force of the coil, the magnetic induction intensity, the coil length, and the number of turns of the coil. The axial vibration speed of the permanent magnet 310 is the same as the axial vibration speed of the measured bearing 400; S150: Obtain the axial vibration value of the measured bearing 400 through the axial vibration speed, analyze the axial vibration value of the measured bearing 400, and judge the defect location of the measured bearing 400.

[0035] In this embodiment, first, pressure is applied to the outer bearing ring 420 through the bearing retaining ring 500. Pressing the outer bearing ring 420 can ensure that the measured bearing 400 remains stable, while the axial vibration generated by the rotation of the inner bearing ring 410 will not be suppressed, so that the final test result will not be affected. The axial locking nut 610 is driven to rotate by the pulley 620. The axial locking nut 610 drives the main shaft 200 to rotate. The main shaft 200 drives the measuring main shaft 300 to rotate. The measuring main shaft 300 drives the shaft core 320 to rotate. The shaft core 320 drives the inner bearing ring 410 to rotate, thereby simulating the rotation of the measured bearing 400 during operation. Through the vibration transmission of close contact, the axial vibration speed of the permanent magnet 310 is the same as the axial vibration speed of the inner bearing ring 410. The axial vibration value is obtained from the axial vibration speed, and the axial vibration value is analyzed to evaluate the bearing quality and find the defect location.

[0036] In the present invention, terms such as "installation", "connection", "attachment", "fixation" and the like shall be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integral connection; "attachment" may be a direct attachment or an indirect attachment through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation of the present invention.

[0038] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the claims.

Claims

1. A vehicle bearing axial vibration detection device, characterized in that: include: Spindle housing (100); A driving spindle (200), the driving spindle (200) being connected to the spindle housing (100), and a measuring coil (210) being provided inside the driving spindle (200); A measuring spindle (300), the measuring spindle (300) being sleeved with the driving spindle (200), and a permanent magnet (310) being provided at one end of the measuring spindle (300) close to the measuring coil (210); A measured bearing (400), the measured bearing (400) comprising a bearing inner ring (410), the bearing inner ring (410) abutting against a measuring spindle (300).

2. The vehicle bearing axial vibration detection device according to claim 1, characterized in that: An end of the measuring spindle (300) close to the measured bearing (400) is provided with a shaft core (320), and the shaft core (320) abuts against the inner ring (410) of the bearing.

3. The vehicle bearing axial vibration detection device according to claim 2, characterized in that: An isolation pad (321) is provided at one end of the shaft core (320) close to the driving main shaft (200), and the isolation pad (321) abuts against the driving main shaft (200).

4. The vehicle bearing axial vibration detection device according to claim 1, characterized in that: The measuring spindle (300) is provided with a plurality of ferrules (330), and the ferrules (330) abut against the driving spindle (200).

5. The vehicle bearing axial vibration detection device according to claim 1, characterized in that: It also includes a bearing pressure ring (500), and the tested bearing (400) also includes a bearing outer ring (420), and the bearing pressure ring (500) abuts against the bearing outer ring (420).

6. The vehicle bearing axial vibration detection device according to claim 1, characterized in that: The spindle housing (100) is provided with a copper sleeve (110), and the copper sleeve (110) is sleeved with the driving spindle (200).

7. The vehicle bearing axial vibration detection device according to claim 6, characterized in that: The driving main shaft (200) is provided with an axial thrust ring (220) and a skeleton oil seal (230); the axial thrust ring (220) abuts against the copper sleeve (110); and the skeleton oil seal (230) abuts against the axial thrust ring (220).

8. The vehicle bearing axial vibration detection device according to claim 1, characterized in that: It also includes an axial locking nut (610), wherein the axial locking nut (610) is connected to the driving main shaft (200).

9. The vehicle bearing axial vibration detection device according to claim 8, characterized in that: It also includes a pulley (620), wherein the pulley (620) is connected to the axial locking nut (610).

10. A method for detecting axial vibration of a vehicle bearing, implemented by the axial vibration detection device for a vehicle bearing as described in any one of claims 1 to 9, characterized in that: include: Step S110: applying pressure to the bearing outer ring (420) through the bearing pressure ring (500); Step S120: the axial locking nut (610) is driven to rotate by the pulley (620), the axial locking nut (610) drives the driving spindle (200) to rotate, the driving spindle (200) drives the measuring spindle (300) to rotate, the measuring spindle (300) drives the shaft core (320) to rotate, and the shaft core (320) drives the bearing inner ring (410) to rotate; Step S130: When the bearing inner ring (410) rotates, axial vibration is generated, and the axial vibration is transmitted to the measuring spindle (300) through the shaft core (320), and the permanent magnet (310) on the measuring spindle (300) moves in the measuring coil (210) due to the axial vibration; Step S140: measuring the coil induced electromotive force by means of a sensor, measuring the magnetic induction intensity by means of a fluxmeter, and calculating the axial vibration speed of the permanent magnet (310) by means of the coil induced electromotive force and the magnetic induction intensity, the coil length, and the number of coil turns, wherein the axial vibration speed of the permanent magnet (310) is the same as the axial vibration speed of the measured bearing (400); Step S150: obtaining the axial vibration value of the measured bearing (400) through the axial vibration velocity, analyzing the axial vibration velocity of the measured bearing (400), and determining the defect position of the measured bearing (400).

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