Equipment and method for testing mechanical performance of automobile rolling bearing

Abstract

The invention relates to the technical field of bearing testing equipment, and discloses an automobile rolling bearing mechanical performance testing device and method, and the device comprises a bottom plate which is provided with a power assembly. The at least one bearing mounting seat is used for fixing a bearing to be tested, and an inner ring of the bearing is sleeved on a rotating shaft; the transmission assembly is connected between the output end of the power assembly and one end of the rotating shaft and used for transmitting torque; the radial pressure applying assembly is arranged on the bottom plate, located above or on the side of the rotating shaft and used for applying an adjustable radial load to the rotating shaft. The device can simultaneously reproduce two core working conditions of the installation stress of the bearing in the device and the external load in the working process, overcomes the limitation that the traditional test device can only carry out single no-load or simple loading, and enables the laboratory test data to more truly reflect the performance and the service life of the bearing in the practical application. And the misjudgment risk caused by test condition distortion is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of bearing testing equipment technology, specifically to a mechanical performance testing device and method for automotive rolling bearings. Background Technology

[0002] Automotive rolling bearings are core components in critical parts of automotive transmission systems, wheel hub systems, and other key components. Their mechanical properties (such as rotational accuracy, lifespan, vibration, temperature rise, and reliability) directly affect the performance and safety of the entire vehicle. Therefore, it is crucial to conduct rigorous performance testing and screening of bearings under simulated operating conditions using specialized testing equipment before installation.

[0003] Existing bearing performance testing equipment typically includes a drive unit, a bearing housing for mounting the bearing, and a rotating shaft for mounting the bearing inner ring. During testing, the drive unit rotates the shaft and the bearing inner ring, and the bearing's performance is evaluated by measuring parameters such as temperature and vibration during operation.

[0004] However, these conventional testing devices have the following obvious limitations: Existing equipment struggles to accurately and comprehensively simulate the complex and combined operating conditions faced by bearings in real-world applications. When bearings operate in automobiles, their service condition involves a superposition of multiple load conditions: on one hand, there is typically an interference fit between the bearing outer ring and the bearing housing, which itself bears radial clamping forces from the housing bore; on the other hand, the bearing also needs to withstand external radial working loads transmitted through the shaft (such as gear meshing forces and belt tension). Current testing equipment is often limited in function, mostly only capable of no-load testing or applying a constant, unidirectional load through simple lever and weight mechanisms. It cannot simultaneously apply and flexibly adjust these two different types and directions of radial forces on the same equipment. This results in test conditions that severely deviate from real-world operating conditions, limiting the reference value of the obtained test data (especially life data) and making it impossible to accurately predict the bearing's performance in actual use.

[0005] Therefore, there is an urgent need in this field for a bearing testing device and method that can overcome the above-mentioned defects. It should be able to accurately simulate the real complex working conditions of bearings, and at the same time have the ability to clamp quickly and accurately to obtain more reliable and more instructive test data. Summary of the Invention

[0006] The purpose of this invention is to provide a testing device and method for the mechanical performance of automotive rolling bearings, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a mechanical performance testing device for automotive rolling bearings, comprising a base plate, wherein the base plate is provided with: Power components; At least one bearing mounting base for fixing the bearing to be tested, wherein the inner ring of the bearing is fitted onto a rotating shaft; A transmission component, which is connected between the output end of the power component and one end of the rotating shaft, is used to transmit torque; A radial pressure application assembly, disposed on the base plate and located above or to the side of the rotating shaft, is used to apply an adjustable radial load to the rotating shaft; The bearing mounting base includes a base body and a radial clamping mechanism disposed on the base body. The radial clamping mechanism includes at least three telescopic members that can move radially synchronously. By driving the telescopic members to move radially synchronously, the outer ring of the bearing mounted in the base body is pressed or released from the outside.

[0008] Furthermore, the radial clamping mechanism also includes an annular cavity and a toothed ring housed within the annular cavity; The base is provided with a plurality of first threaded seats that communicate with the annular cavity, and each first threaded seat is equipped with a telescopic member; The telescopic component includes a threaded sleeve that is threadedly engaged with the first threaded seat, a pin that is threadedly engaged with the threaded sleeve, and an adjusting gear fixed to the pin and meshing with the gear ring. One end of the pin extends into the channel of the seat and is provided with a support plate for contacting the outer ring of the bearing; By rotating the gear ring, all the adjusting gears can be driven to rotate synchronously, thereby causing all the pins to move radially synchronously.

[0009] Furthermore, the seat body is also provided with a second threaded seat that communicates with the annular cavity. A rotating component is installed inside the second threaded seat. One end of the rotating component is provided with a drive gear that meshes with the toothed ring, and the other end is provided with a turntable located outside the seat body.

[0010] Furthermore, a bushing is provided at the part of the pin that passes through the seat. The bushing includes a first pressure ring, a second pressure ring, and a threaded rod connecting the two. A spring is provided between the first pressure ring and the second pressure ring. An outer sealing ring and an inner sealing ring are respectively provided on the opposite surfaces of the first pressure ring and the second pressure ring. By tightening the threaded rod to compress the spring, the first pressure ring and the second pressure ring can be brought closer to each other, thereby squeezing the outer sealing ring and the inner sealing ring to achieve a seal.

[0011] Furthermore, the transmission assembly includes a first sleeve connected to the output end of the power assembly, a second sleeve connected to the end of the rotating shaft, and a linkage mechanism connecting the first sleeve and the second sleeve. The linkage mechanism includes a sleeve with one end hinged to the first sleeve and a rod body with one end hinged to the second sleeve. The other end of the rod body extends into the sleeve and can move relative to it along the axial direction. The rod body and the sleeve are connected by a spline or keyway.

[0012] Furthermore, the radial pressure assembly includes a housing fixed to the base plate, a short shaft vertically installed in the housing and capable of moving up and down, a first gear fixed to the bottom end of the short shaft, and a second gear meshing with the first gear; The top end of the short shaft extends out of the housing and is connected to a pressure seat for pressing the rotating shaft; The second gear is connected to an input shaft, one end of which extends out of the housing and is connected to a power input component; By driving the second gear to rotate, the first gear and the short shaft can be moved upward, thereby causing the pressure seat to apply radial pressure to the rotating shaft.

[0013] Furthermore, a protective housing is also provided on the base plate, and a speed measuring device for detecting the rotational speed of the rotating shaft is provided inside the protective housing.

[0014] Furthermore, there are two bearing mounting seats, which are spaced apart and jointly support the same rotating shaft.

[0015] A method for testing the mechanical properties of automotive rolling bearings using a testing device, comprising the following steps: Installation steps: Install the two bearings to be tested into the two bearing mounting seats respectively, and fit the inner ring of the bearing onto the rotating shaft; Clamping step: Operate the radial clamping mechanism of the bearing mounting seat to drive all telescopic parts to move radially inward synchronously until the end plate presses against the outer ring of the bearing; Driving steps: Start the power unit, which drives the rotating shaft to rotate through the transmission unit; Pressure test procedure: Operate the radial pressure assembly to apply a radial load to the rotating shaft to simulate the load condition of the bearing; Testing steps: While applying the radial load, monitor the rotational speed of the rotating shaft using a speed measuring device, and observe and record the working state of the bearing.

[0016] The present invention has the following beneficial effects: (1) The device of the present invention can simultaneously reproduce the two core working conditions of the bearing in the equipment and the external load during operation, overcoming the limitation of traditional testing equipment that can only perform single no-load or simple loading, so that the laboratory test data can more realistically reflect the performance and life of the bearing in actual application, and greatly reduce the risk of misjudgment caused by the distortion of test conditions.

[0017] (2) The synchronous clamping mechanism of this invention can control the synchronous and concentric movement of three or more clamping points with a single input, realizing the rapid and centered clamping and disassembly of bearings, avoiding the misalignment problem caused by tightening bolts one by one in the traditional method. This not only simplifies the operation steps, but also fundamentally ensures the consistency of the bearing installation state in each test, providing a stable and reliable benchmark for the performance comparison of different batches of bearings, thereby greatly improving the testing efficiency and data comparability.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the transmission structure of the present invention; Figure 3 This is a schematic diagram of the rotating shaft mounting structure of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the cross-sectional structure; Figure 5 This is a schematic diagram of the bearing mounting base of the present invention; Figure 6 This is a schematic cross-sectional view of the bearing mounting base of the present invention; Figure 7 This is an exploded view of the bearing mounting base of the present invention; Figure 8 This is a cross-sectional schematic diagram of the bearing mounting base of the present invention; Figure 9 This is a schematic diagram of the telescopic component of the present invention; Figure 10 This is a schematic diagram of the exploded bushing of the present invention; Figure 11 This is a schematic diagram of the installation structure of the transmission component of the present invention; Figure 12 This is a schematic diagram of the transmission component structure of the present invention; The attached diagram lists the components represented by each number as follows: In the diagram: 1. Base plate; 2. Motor mount; 3. Drive motor; 4. Transmission assembly; 401. First mounting bracket; 402. Rod sleeve; 403. Rod body; 404. Second mounting bracket; 5. Bearing mounting bracket; 501. Stand; 5011. First threaded seat; 5012. Second threaded seat; 5013. Annular cavity; 502. Telescopic component; 5021. Pin; 5022. Adjusting gear; 5023. Threaded sleeve; 5024. Support plate; 5 03. Rotating component; 504. Gear ring; 505. Bushing; 5051. First pressure ring; 5052. Second pressure ring; 5053. Outer sealing ring; 5054. Inner sealing ring; 5055. Threaded rod; 5056. Spring; 506. End cap; 6. Rotating shaft; 7. Radial pressure assembly; 701. Housing; 702. Short shaft; 703. First gear; 704. Second gear; 705. Pressure seat; 8. Protective housing; 9. Bearing. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Performance Testing Equipment like Figures 1 to 12 As shown in the figure, this embodiment provides a mechanical performance testing device for automotive rolling bearings.

[0023] Reference Figure 1 The testing equipment includes a rectangular base plate 1, which serves as the foundation platform for the entire equipment. A drive motor 3, acting as a power component, is fixedly mounted at one end of the base plate 1 via a motor mount 2. The output shaft of the drive motor 3 is connected to one end of a rotating shaft 6 via a transmission assembly 4.

[0024] The rotating shaft 6 is supported by two spaced-apart bearing mounting seats 5. Each bearing mounting seat 5 houses an automotive rolling bearing 9 to be tested. The inner rings of the two bearings 9 are fitted together on the rotating shaft 6, enabling the rotating shaft 6 to rotate smoothly.

[0025] To simulate the radial load condition of a bearing in actual operation, a radial pressure assembly 7 is provided below the rotating shaft 6 located between the two bearing mounting seats 5 to apply an adjustable radial load to the rotating shaft 6.

[0026] In addition, a protective housing 8 is provided on the outside of the end of the rotating shaft 6 away from the drive motor 3. A speed sensor (such as a photoelectric encoder or Hall sensor) is installed inside the housing. The sensor's detection head is aligned with the end of the rotating shaft 6 or the speed measuring code disk installed on the shaft end, for real-time monitoring of the rotation speed of the rotating shaft 6.

[0027] The specific structure of the transmission assembly: Reference Figure 11 and Figure 12 The transmission assembly 4 includes a first sleeve 401 fixedly mounted on the output shaft of the drive motor 3, and a second sleeve 404 fixedly mounted on the end of the rotating shaft 6. The first sleeve 401 is hinged to one end of a rod sleeve 402 via a first hinge pin. The second sleeve 404 is hinged to one end of a rod body 403 via a second hinge pin. The other end of the rod body 403 extends into the inner hole of the rod sleeve 402, and the rod body 403 and the rod sleeve 402 are engaged by a spline (or key and keyway), allowing them to slide relative to each other axially while transmitting torque. This structure can effectively transmit motor torque and compensate for minor installation errors that may exist between the motor shaft and the rotating shaft 6, ensuring smooth power transmission.

[0028] The specific structure of the bearing mounting base: Reference Figures 5-8 The bearing mounting base 5 is a core component of this invention. It includes a stand 501 fixed to the base plate 1. The center of the stand 501 has a circular channel for accommodating the bearing 9. Lubricating oil can be filled into the circular channel to lubricate the bearing. The lubricating oil forms a storage groove through the installed end cap 506. Inside the stand 501, an annular cavity 5013 is formed around the channel.

[0029] On the side of the support 501, three first threaded seats 5011 that communicate with the annular cavity 5013 are evenly distributed along the circumference. In addition, between two adjacent first threaded seats 5011, there is a second threaded seat 5012 that communicates with the annular cavity 5013.

[0030] Each first threaded seat 5011 is equipped with a telescopic component 502. The telescopic component 502 includes a threaded sleeve 5023 screwed into the first threaded seat 5011, a pin 5021 with one end threadedly engaged with the threaded sleeve 5023, and an adjusting gear 5022 fixedly mounted on the pin 5021. The other end of the pin 5021 passes through the inner wall of the annular cavity 5013 and extends into the channel of the stand 501, and an arc-shaped support plate 5024 is fixedly mounted at this end by screws for directly contacting and pressing the outer ring of the bearing 9.

[0031] A rotating component 503 is mounted inside the second threaded seat 5012 via a bearing. The rotating component 503 includes a short rod, with a drive gear fixedly mounted in the middle of the rod, which is located within the annular cavity 5013. The outer end of the short rod extends out of the second threaded seat 5012 and is equipped with a handwheel-type turntable for easy manual rotation by the operator.

[0032] A toothed ring 504 is supported within the annular cavity 5013 by a bearing or a sliding sleeve. The internal teeth of the toothed ring 504 mesh with the adjusting gears 5022 on the three telescopic members 502 and the drive gear on the rotating member 503. The two annular openings of the annular cavity 5013 are ultimately closed by end caps 506 to prevent dust from entering.

[0033] Working Principle: When it is necessary to clamp bearing 9, the operator uses a wrench to rotate the turntable of rotating component 503, which drives the drive gear to rotate, and the drive gear drives the gear ring 504 to rotate. The gear ring 504 synchronously drives the three meshing adjusting gears 5022 to rotate. Since the threaded sleeve 5023 is fixed in the first threaded seat 5011 and cannot rotate, the rotation of the adjusting gears 5022 forces the pins 5021 to move along their axial direction (i.e., radially) towards the center of the channel under the action of the threads, and finally presses them evenly onto the outer ring of bearing 9 through the support plate 5024. Reversing the rotation of rotating component 503 will cause the three pins 5021 to retract synchronously, releasing the bearing. This design ensures that the bearing is clamped concentrically and evenly, avoiding test errors caused by unilateral force.

[0034] The sealing structure of the bushing: Reference Figure 5 In order to seal the gap between the pin 5021 and the stand 501 and prevent grease leakage or dust from entering the annular cavity 5013, a bushing 505 is installed in the stepped hole through which the pin 5021 passes through the stand 501.

[0035] The bushing 505 includes a first pressure ring 5051 and a second pressure ring 5052. The first pressure ring 5051 and the second pressure ring 5052 are connected by multiple threaded rods 5055 evenly distributed circumferentially. A spring 5056 is fitted on the threaded rods 5055, and the spring 5056 is compressed between the first pressure ring 5051 and the second pressure ring 5052 to provide a preload.

[0036] On the opposite end faces of the first pressure ring 5051 and the second pressure ring 5052, annular grooves are respectively formed for installing the outer sealing ring 5053 and the inner sealing ring 5054 (O-rings or PTFE sealing rings can be used). When the nuts at both ends of the threaded rod 5055 are tightened, the first pressure ring 5051 and the second pressure ring 5052 move closer to each other with the assistance of the spring 5056, thereby simultaneously squeezing the outer sealing ring 5053 and the inner sealing ring 5054 from both the inside and outside. The outer sealing ring 5053 is squeezed outward, tightly fitting the inner wall of the stepped hole; the inner sealing ring 5054 is squeezed inward, tightly fitting the outer surface of the pin 5021, thus achieving an excellent bidirectional sealing effect.

[0037] The specific structure of the radial pressure application component: Reference Figure 6 The radial pressure assembly 7 includes a housing 701 bolted to the base plate 1. A short shaft 702 is vertically mounted inside the housing 701, with the top end of the short shaft 702 extending out of the housing 701 and fitted with an arc-shaped pressure seat 705, which can press against the outer circular surface of the rotating shaft 6.

[0038] Several balls can be installed on the concave surface of the pressure seat 705. The balls contact the outer side of the rotating shaft 6 to reduce frictional resistance.

[0039] A first gear 703 is fixedly mounted at the bottom end of the short shaft 702. An input shaft is also horizontally mounted inside the housing 701 via a bearing. One end of the input shaft is fitted with a second gear 704 that meshes with the first gear 703. The other end of the input shaft extends out of the housing 701 and is connected to a handwheel (or to a servo motor via a coupling) as a power input component.

[0040] Working principle: When a radial load needs to be applied, turn the handwheel (or start the servo motor) to rotate the second gear 704. Since the first gear 703 is radially constrained between itself and the housing 701, the rotation of the second gear 704 will generate an upward thrust, forcing the first gear 703 to move upward along its tooth profile, thereby driving the short shaft 702 and the pressure seat 705 to move upward, ultimately pressing the pressure seat 705 against the rotating shaft 6. By controlling the rotation angle of the handwheel or the torque of the servo motor, the magnitude of the radial pressure applied to the rotating shaft 6 can be precisely controlled to simulate different load conditions.

[0041] For example, when a family car is stationary on a level road, the wheel bearings bear a constant static load from the weight of the car body.

[0042] Assuming that the radial force that a single bearing needs to withstand is 500 Newtons (N) according to calculations.

[0043] Operation and Implementation: Before the equipment leaves the factory, technicians will perform calibration. They will determine through experiments that when a torque of 1.5 Nm is applied to the handwheel and the handwheel is locked, the pressure seat 705 will generate a constant pressure of 500 N on the shaft.

[0044] During testing, the operator uses a torque wrench to rotate the handwheel until the torque wrench reading reaches 1.5 Nm, and then locks the self-locking mechanism of the handwheel.

[0045] At this point, regardless of how the shaft 6 rotates, the bearing 9 always operates under a constant radial load of 500N. Under these conditions, testers can perform long-term tests on the bearing's durability, temperature rise, and vibration characteristics.

[0046] Example 2: Test Method This embodiment provides a testing method using the device from Embodiment 1, including the following steps: Installation steps: Place the two bearings 9 to be tested into the channels of the two bearing mounting seats 5 respectively. Then, pass the rotating shaft 6 through the inner rings of the two bearings 9. Subsequently, rotate the rotating component 503 on each bearing mounting seat 5 to drive the three telescopic components 502 to move inward synchronously, and evenly press the outer ring of the bearing 9 through the support plate 5024 to complete the fixed installation of the bearings.

[0047] Driving steps: Start the drive motor 3. The motor power is transmitted sequentially through the first sleeve 401, the rod sleeve 402, the rod body 403, and the second sleeve 404 of the transmission assembly 4 to the rotating shaft 6, causing the rotating shaft 6 and the inner ring of the bearing 9 to rotate together.

[0048] Pressure test procedure: After the rotating shaft 6 has been running smoothly, slowly rotate the handwheel of the radial pressure component 7 to drive the pressure seat 705 to press the rotating shaft 6 downward, applying a radial load to the rotating system. This load is ultimately transmitted to the two bearings 9 through the rotating shaft 6, simulating their stress state in actual operation.

[0049] Testing and Recording Procedures: During the pressurization process, the rotational speed of the rotating shaft 6 is monitored in real time by a speed sensor inside the protective housing 8. Simultaneously, operators use an infrared thermometer to monitor the outer ring temperature of the bearing 9 and a vibration sensor to monitor the vibration acceleration of the bearing housing. They also record the bearing's temperature rise, vibration data, and stable operating time under specific loads and speeds to comprehensively evaluate the mechanical performance (such as lifespan, ultimate load, and high-temperature stability) of this batch of bearings.

[0050] After the test, rotate the handwheel of the radial pressure assembly 7 in the opposite direction to remove the load and turn off the drive motor 3. Finally, rotate the rotating part 503 of the bearing mounting base 5 in the opposite direction to loosen the clamp on the bearing 9, and then remove the tested bearing 9 and the rotating shaft 6.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A mechanical performance testing device for automotive rolling bearings, comprising a base plate (1), characterized in that: The base plate (1) is provided with: Power components; At least one bearing mounting base (5) is provided for fixing the bearing (9) to be tested, and the inner ring of the bearing (9) is fitted onto a rotating shaft (6). A transmission assembly (4) is connected between the output end of the power assembly and one end of the rotating shaft (6) for transmitting torque; A radial pressure assembly (7), which is disposed on the base plate (1) and located above or to the side of the rotating shaft (6), is used to apply an adjustable radial load to the rotating shaft (6); The bearing mounting base (5) includes a base body and a radial clamping mechanism disposed on the base body. The radial clamping mechanism includes at least three telescopic members (502) that can move radially synchronously. By driving the telescopic members (502) to move radially synchronously, the outer ring of the bearing (9) mounted in the base body is pressed or released from the outside.

2. The automotive rolling bearing mechanical performance testing equipment according to claim 1, characterized in that, The radial clamping mechanism further includes an annular cavity (5013) and a toothed ring (504) housed within the annular cavity (5013). The seat body is provided with a plurality of first threaded seats (5011) communicating with the annular cavity (5013), and each first threaded seat (5011) is equipped with a telescopic member (502). The telescopic component (502) includes a threaded sleeve (5023) that is threadedly engaged with the first threaded seat (5011), a pin (5021) that is threadedly engaged with the threaded sleeve (5023), and an adjusting gear (5022) that is fixed to the pin (5021) and meshes with the toothed ring (504). One end of the pin (5021) extends into the channel of the seat and is provided with a support plate (5024) for contacting the outer ring of the bearing. By rotating the gear ring (504), all the adjusting gears (5022) can be driven to rotate synchronously, thereby causing all the pins (5021) to move radially synchronously.

3. The automotive rolling bearing mechanical performance testing equipment according to claim 2, characterized in that, The seat is also provided with a second threaded seat (5012) that communicates with the annular cavity (5013). A rotating component (503) is installed in the second threaded seat (5012). One end of the rotating component (503) is provided with a drive gear that meshes with the toothed ring (504), and the other end is provided with a turntable located outside the seat.

4. The automotive rolling bearing mechanical performance testing equipment according to claim 2, characterized in that, A bushing (505) is provided at the part of the pin (5021) that passes through the seat. The bushing (505) includes a first pressure ring (5051), a second pressure ring (5052), and a threaded rod (5055) connecting the two. A spring (5056) is provided between the first pressure ring (5051) and the second pressure ring (5052). An outer sealing ring (5053) and an inner sealing ring (5054) are respectively provided on the opposite surfaces of the first pressure ring (5051) and the second pressure ring (5052). By tightening the threaded rod (5055) to compress the spring (5056), the first pressure ring (5051) and the second pressure ring (5052) can be brought closer to each other, thereby squeezing the outer sealing ring (5053) and the inner sealing ring (5054) to achieve a seal.

5. The automotive rolling bearing mechanical performance testing equipment according to claim 1, characterized in that, The transmission assembly (4) includes a first sleeve (401) connected to the output end of the power assembly, a second sleeve (404) connected to the end of the rotating shaft (6), and a linkage mechanism connected between the first sleeve (401) and the second sleeve (404); The linkage mechanism includes a sleeve (402) with one end hinged to the first sleeve (401) and a rod body (403) with one end hinged to the second sleeve (404). The other end of the rod body (403) extends into the sleeve (402) and can move relative to it along the axial direction. The rod body (403) and the sleeve (402) are connected by a spline or keyway.

6. The automotive rolling bearing mechanical performance testing equipment according to claim 1, characterized in that, The radial pressure assembly (7) includes a housing (701) fixed on the base plate (1), a short shaft (702) vertically installed in the housing (701) and capable of moving up and down, a first gear (703) fixed to the bottom end of the short shaft (702), and a second gear (704) meshing with the first gear (703). The top end of the short shaft (702) extends out of the housing (701) and is connected to a pressure seat (705) for pressing the rotating shaft (6). The second gear (704) is connected to an input shaft, one end of which extends out of the housing (701) and is connected to a power input component; By driving the second gear (704) to rotate, the first gear (703) and the short shaft (702) can be pushed to move upward, thereby causing the pressure seat (705) to apply radial pressure to the rotating shaft (6).

7. The automotive rolling bearing mechanical performance testing equipment according to claim 1, characterized in that, A protective housing (8) is also provided on the base plate (1), and a speed measuring device for detecting the rotational speed of the rotating shaft (6) is provided inside the protective housing (8).

8. The automotive rolling bearing mechanical performance testing equipment according to claim 1, characterized in that, There are two bearing mounting seats (5), which are spaced apart and jointly support the same rotating shaft (6).

9. A method for testing the mechanical properties of automotive rolling bearings using the testing equipment described in any one of claims 1-8, characterized in that, Includes the following steps: Installation steps: Install the two bearings (9) to be tested into the two bearing mounting seats (5) respectively, and put the inner ring of the bearing (9) onto the rotating shaft (6); Clamping step: Operate the radial clamping mechanism of the bearing mounting seat (5) to drive all telescopic parts (502) to move radially inward synchronously until the end plate (5024) presses the outer ring of the bearing (9); Driving steps: Start the power assembly and drive the rotating shaft (6) to rotate through the transmission assembly (4); Pressure test procedure: Operate the radial pressure assembly (7) to apply a radial load to the rotating shaft (6) to simulate the load condition of the bearing; Detection steps: While applying the radial load, monitor the rotational speed of the rotating shaft (6) using a speed measuring device, and observe and record the working state of the bearing (9).

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