A wheel hub bearing device and an impact testing machine

Abstract

The present application relates to the technical field of wheel hub detection, and discloses a wheel hub bearing device and an impact testing machine, the rotation of the first angle adjusting plate is controlled by the hydraulic cylinder, the angle is adjusted with the rotating column as the shaft, the arc-shaped seat and the concave arc surface of the bearing table always keep the state of close contact, which ensures that the impact force generated by the drop hammer mechanism impacting the wheel hub is offset by the bearing table at any angle of the first angle adjusting plate within the preset range, so that the angle control of the first angle adjusting plate will not produce adjustment error due to multiple impact tests, and the bearing table effectively offsets the impact force of the drop hammer mechanism by lifting the arc-shaped seat, avoiding loosening of the triangular structure due to frequent impact. The existing bearing device of the wheel hub outer edge inclined impact testing machine is prone to loosening of the triangular structure composed of the bottom plate, the angle adjusting plate and the hydraulic cylinder during frequent impact tests, which leads to the decline of the inclination angle adjustment precision of the angle adjusting plate and the failure of the hydraulic cylinder, affecting the accuracy of the test and the reliability of the equipment.

Description

Technical Field

[0001] This invention relates to the field of wheel hub testing technology, specifically to a wheel hub bearing device and an impact testing machine. Background Technology

[0002] A wheel hub impact testing machine is a device used to test the strength and durability of automobile wheel hubs under impact loads. It mainly consists of a load-bearing device, a drop hammer mechanism, and a control mechanism that controls the raising and lowering of the drop hammer mechanism, with the drop hammer mechanism located above the load-bearing device.

[0003] The load-bearing device of the wheel hub outer edge tilt impact testing machine is responsible for tilting the wheel hub during assembly to simulate an impact on the side of the wheel hub. For example, when conducting a side impact test on a DL13 wheel hub, the tilt detection angle is typically between 13° and 30°. Figure 1 As shown, the supporting device of the testing machine includes a base plate, an adjusting plate that is rotatably mounted to the upper side of the base plate via a hinge, and a hydraulic cylinder for controlling the lifting and lowering of one end of the adjusting plate. The hub is mounted on the upper side of the adjusting plate via a fixed seat, and its tilt angle is precisely controlled by the hydraulic cylinder.

[0004] However, the base plate, the adjusting plate, and the hydraulic cylinder together form a triangular structure. When the drop hammer mechanism impacts the wheel hub, the entire triangular structure must withstand the impact force generated by the drop hammer mechanism. In this process, the hydraulic cylinder bears most of the impact force. Due to the special nature of the hinge connection, the triangular structure is prone to loosening under frequent impacts. This loosening not only affects the tilt angle adjustment accuracy of the adjusting plate but may also cause the hydraulic cylinder to malfunction. Summary of the Invention

[0005] The purpose of this invention is to provide a wheel hub bearing device and an impact testing machine, which solves the problem that in the existing bearing device of the wheel hub outer edge tilting impact testing machine, the triangular structure composed of the base plate, the angle adjusting plate and the hydraulic cylinder is prone to loosening during frequent impact tests, resulting in a decrease in the adjustment accuracy of the angle adjusting plate tilt angle and hydraulic cylinder failure, which affects the accuracy of the test and the reliability of the equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hub bearing device, comprising:

[0007] The base plate has an adjusting plate mounted on its upper side via a hydraulic cylinder. A fixed seat is fixedly mounted on the upper surface of the adjusting plate, and an arc-shaped seat is fixedly mounted on the lower surface of one end of the adjusting plate. The fixed seat is located above the arc-shaped seat, and rotating columns are coaxially mounted on both sides of the arc-shaped seat.

[0008] The support mechanism includes a support platform disposed below the arc-shaped seat and a positioning assembly for a rotating column for rotating assembly. The upper side of the support platform is provided with a concave arc surface adapted to fit the lower arc surface of the arc-shaped seat. One end of the hydraulic cylinder is connected to the end of the angle adjusting plate away from the arc-shaped seat.

[0009] The stabilizing mechanism includes a stop bar, which is supported on the upper side of an adjusting plate by support frames at both ends, and a slide assembly is provided on the lower side of the support frames.

[0010] As a further description of the above technical solution: the positioning component includes an upper clamping block and a lower clamping block, and a clamping cavity for rotating and holding the rotating column is formed between the upper clamping block and the lower clamping block.

[0011] As a further description of the above technical solution: the upper surface of the base plate is provided with a side support frame for fixing and supporting the upper clamping block;

[0012] The upper clamping block is provided with a connecting rod on its lower side, and the surface of the lower clamping block is provided with an assembly groove for inserting the connecting rod. One end of the connecting rod is provided with a nut and a spring, and the spring elastically pushes the lower clamping block towards the upper clamping block.

[0013] As a further description of the above technical solution: a limiting arc block is provided on the lower surface of the upper clamping block, and a positioning groove for the limiting arc block is opened on the surface of the rotating column.

[0014] As a further description of the above technical solution: a second spring is provided at one end of the guide rail near the bearing mechanism, and the second spring elastically pulls the moving platform to slide towards the bearing mechanism.

[0015] As a further description of the above technical solution: a locking component is provided at the end of the guide rail away from the bearing mechanism, and the locking component locks the moving stage to one end of the guide rail.

[0016] As a further description of the above technical solution: the locking component includes a buckle plate rotatably disposed at one end of the guide rail, a torsion spring sleeved on the rotation shaft of the buckle plate, and a lever plate at one end of the buckle plate;

[0017] The mobile platform has a buckle groove at one end of the buckle plate, and the buckle plate is fitted and snapped into the buckle groove.

[0018] As a further description of the above technical solution: the lower side of the stop bar is provided with a contact plane, and the contact plane is movably contacted with the upper surface of the angle adjusting plate;

[0019] The upper surface of the adjusting plate is provided with a rough part, and the mating plane is in frictional contact with the rough part.

[0020] As a further description of the above technical solution: the lower surface of the angle adjusting plate is provided with reinforcing ribs.

[0021] An impact testing machine includes a drop hammer mechanism and a control mechanism for controlling the lifting and lowering of the drop hammer mechanism, wherein a hub bearing device is mounted below the drop hammer mechanism.

[0022] The impact zone of the wheel hub mounted on the wheel hub bearing device is located directly below the drop hammer mechanism.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The rotation of the angle adjusting plate is controlled by a hydraulic cylinder, with the rotating column as the axis for angle adjustment. The concave arc surface of the arc-shaped seat and the support platform always remain in contact. This ensures that at any angle within the preset range, the impact force generated by the drop hammer mechanism impacting the hub is offset by the support platform, thus guaranteeing that the angle control of the angle adjusting plate will not produce adjustment errors due to multiple impact tests. In addition, the support platform effectively offsets the impact force of the drop hammer mechanism by supporting the arc-shaped seat, preventing the triangular structure from loosening due to frequent impacts, thereby improving the stability and reliability of the entire device.

[0025] 2. The stop bar in the stabilizing mechanism abuts against the upper surface of the angle adjusting plate one through the slide assembly, preventing the angle adjusting plate one from rising when impacted by the drop hammer mechanism, avoiding pulling on the hydraulic cylinder one, thereby extending the service life of the hydraulic cylinder one. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the existing load-bearing device and drop hammer mechanism.

[0027] Figure 2 This is a schematic diagram of the supporting device and the drop hammer mechanism of the present invention;

[0028] Figure 3 This is a schematic diagram of the supporting device structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the disassembled structure of the support device of the present invention;

[0030] Figure 5 This is a schematic diagram of the positioning component structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the disassembled structure of the positioning component of the present invention;

[0032] Figure 7 This is a schematic diagram of the stabilizing mechanism structure of the present invention;

[0033] Figure 8 for Figure 7 Enlarged diagram of A in the middle;

[0034] Figure 9 This is a schematic diagram of the angle adjustment plate structure of the present invention;

[0035] Figure 10 This is a schematic diagram of the lower structure of the angle adjustment plate of the present invention.

[0036] In the diagram: 10. Base plate; 11. Adjusting plate 1; 12. Hydraulic cylinder 1; 13. Fixed seat; 14. Arc-shaped seat; 15. Rotating column; 16. Positioning groove; 17. Reinforcing rib; 20. Bearing mechanism; 21. Bearing platform; 211. Concave arc surface; 22. Positioning component; 221. Upper clamping block; 222. Lower clamping block; 223. Connecting rod; 224. Nut; 225. Spring 1; 226. Limiting arc block; 23. Side support frame; 30. Stabilizing mechanism; 31. Stop bar; 311. Fitting plane; 32. Support frame; 33. Slide assembly; 331. Moving platform; 332. Guide rail; 333. Buckle groove; 34. Locking component; 341. Buckle plate; 342. Torsion spring; 343. Pulley; 35. Spring 2; 40. Drop hammer mechanism;

[0037] 11a. Angle adjustment plate two; 12a. Hydraulic cylinder two. Detailed Implementation

[0038] 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.

[0039] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0040] Figure 1 A load-bearing device for an existing wheel hub outer edge tilting impact testing machine is demonstrated. An adjusting plate 11a is rotatably mounted on a base plate 10 via a hinge structure, and a hydraulic cylinder 12a is supported at the other end of the adjusting plate 11a. The two ends of the hydraulic cylinder 12a are also rotatably connected to the adjusting plate 11a and the surface of the base plate 10 via hinge structures, forming a triangular structure with the base plate 10, the adjusting plate 11a, and the hydraulic cylinder 12a.

[0041] A fixing seat 13 is fixedly installed on the upper surface of the adjusting plate 2 11a near the end of the hydraulic cylinder 2 12a. The wheel hub is fixedly mounted on the upper side of the adjusting plate 2 11a through the fixing seat 13. By controlling the linear extension and retraction length of the hydraulic cylinder 2 12a, the tilt of the adjusting plate 2 11a can be controlled, thereby further controlling the tilt of the wheel hub.

[0042] During the impact test of the wheel hub, the upper rim of the tilted wheel hub is the part to be impacted. A drop hammer mechanism 40, with a preset weight, falls freely from a preset height, impacting the part of the wheel hub to be impacted, thus completing the impact test on the side of the wheel hub. Finally, the degree of deformation of the impacted part of the wheel hub is measured to determine whether the stiffness of the wheel hub meets the requirements.

[0043] However, when the drop hammer mechanism 40 impacts the hub on the adjusting plate 2 11a, the impact force is concentrated on the hydraulic cylinder 2 12a. Therefore, the use of hydraulic cylinder 2 12a not only requires controlling and adjusting the tilt of the adjusting plate 2 11a, but also requires it to withstand the impact force of the drop hammer mechanism 40. During frequent impact tests of the drop hammer mechanism 40, hydraulic cylinder 2 12a is prone to malfunction, leading to frequent maintenance and repair cycles.

[0044] Furthermore, during frequent impact tests of the drop hammer mechanism 40, the hinge structures at the corners of the triangular structures of the base plate 10, the angle adjusting plate 11a, and the hydraulic cylinder 12a are prone to loosening. When the hinge structures become loose, the angle control of the angle adjusting plate 11a will have a large error, which will affect the accuracy of the wheel hub inspection.

[0045] Combination Figures 2 to 10 To address the above problems, the present invention provides a hub bearing device, comprising the following parts:

[0046] A base plate 10 has an adjusting plate 11 movably mounted on its upper side via a hydraulic cylinder 12. A fixing seat 13 is fixedly mounted on the upper surface of the adjusting plate 11 for fixing the wheel hub. An arc-shaped seat 14 is fixedly mounted on the lower surface of one end of the adjusting plate 11, and the fixing seat 13 is positioned above the arc-shaped seat 14. Rotating columns 15 are coaxially mounted on both sides of the arc-shaped seat 14.

[0047] The supporting mechanism 20 includes a supporting platform 21 disposed below the arc-shaped seat 14, and a positioning assembly 22 for rotating and assembling the rotating column 15. The upper side of the supporting platform 21 has a concave arc surface 211 adapted to fit the lower arc surface of the arc-shaped seat 14, used to support the arc-shaped seat 14. When the drop hammer mechanism 40 falls freely and impacts the hub on the fixed seat 13, the supporting platform 21 supports the arc-shaped seat 14, thus counteracting the impact force generated by the drop hammer mechanism 40 impacting the hub.

[0048] One end of the hydraulic cylinder 12 is connected to the end of the adjusting plate 11 away from the arc-shaped seat 14. By controlling the hydraulic cylinder 12, its output end drives the adjusting plate 11 to rotate around the rotating column 15, thereby adjusting the angle of the adjusting plate 11 and further adjusting the angle of the wheel hub. When the adjusting plate 11 rotates around the rotating column 15, the concave arc surface 211 of the arc-shaped seat 14 and the support platform 21 always remains in contact. Therefore, at any angle within the preset range, the impact force generated by the drop hammer mechanism 40 impacting the wheel hub at the corresponding angle is canceled out by the support platform 21. This ensures that the angle control of the adjusting plate 11 will not produce adjustment errors due to multiple impact tests by the drop hammer mechanism 40.

[0049] like Figure 2 and Figure 3 As shown, a stabilizing mechanism 30, including a stop bar 31, is also provided at one end of the angle adjustment plate 11. The stop bar 31 is supported on the upper side of the angle adjustment plate 11 by support frames 32 provided at both ends, and a slide assembly 33 is provided on the lower side of the support frames 32.

[0050] After the angle adjustment plate 11 is adjusted by the hydraulic cylinder 12, the stop rod 31 can be slid towards the angle adjustment plate 11 via the slide assembly 33, so that the lower side of the stop rod 31 abuts against the upper surface of the angle adjustment plate 11. In this way, when the drop hammer mechanism 40 impacts the hub, causing the end of the angle adjustment plate 11 away from the hub to tend to rise, the stop rod 31 can limit one end of the angle adjustment plate 11, preventing that end from pulling on the hydraulic cylinder 12 and thus affecting its service life.

[0051] It is worth mentioning that:

[0052] Combination Figure 1 When the existing tilting plate 21a is adjusted by the hydraulic cylinder 22a, the horizontal displacement length of the impact area of ​​the wheel hub mounted on the upper side of the tilting plate 21a is relatively long. Therefore, the impact area of ​​the lower surface of the drop hammer mechanism 40 for impacting the wheel hub needs to be correspondingly large, which results in a larger design volume for the drop hammer mechanism 40. On the one hand, this increases the design volume of the equipment, leading to an increase in the required assembly space; on the other hand, when the operator assembles the wheel hub onto the tilting plate 21a, the larger volume of the drop hammer mechanism 40 will obstruct the assembly operation, thereby increasing the assembly difficulty.

[0053] In this invention, the rotation adjustment of the angle adjustment plate 11 is centered on the positioning groove 16. Since the fixed base 13 is positioned above the rotating column 15, the rotating arm of the hub mounted on the fixed base 13 is relatively short. Therefore, the horizontal displacement length of the impact area of ​​the hub is small, and the impact area required by the drop hammer mechanism 40 is also smaller. This will greatly improve the problems mentioned above.

[0054] Combination Figure 3 and Figure 4 Furthermore, the positioning component 22 includes an upper clamping block 221 and a lower clamping block 222, with a clamping cavity formed between the upper clamping block 221 and the lower clamping block 222 for rotatably clamping the rotating column 15.

[0055] The upper surface of the base plate 10 is provided with a side support 23 for fixing and supporting the upper clamping block 221.

[0056] The lower side of the upper clamping block 221 is provided with a connecting rod 223, and the surface of the lower clamping block 222 is provided with an assembly groove for inserting the connecting rod 223. One end of the connecting rod 223 is provided with a nut 224 and a spring 225. The spring 225 elastically pushes the lower clamping block 222 towards the upper clamping block 221, and the elastic force of the spring 225 is sufficient to support the overall weight of the adjusting plate 11 and the wheel hub mounted on the adjusting plate 11.

[0057] Specifically, when adjusting the angle plate 11 rotates, the upper clamping block 221 and the lower clamping block 222 clamp the rotating column 15, allowing the angle plate 11 to be rotated and adjusted. Simultaneously, the weight of the angle plate 11 and the hub acts on the connection structure between the rotating column 15 and the positioning assembly 22. Therefore, the contact friction between the arc-shaped seat 14 and the support platform 21 is small, preventing wear between the arc-shaped seat 14 and the support platform 21 from affecting the height accuracy of the support platform 21 supporting the arc-shaped seat 14.

[0058] When the drop hammer mechanism 40 impacts the hub on the angle adjustment plate 11, the lower clamping block 222 is elastically supported by the spring 225 below the upper clamping block 221. The impact force generated by the drop hammer mechanism 40 on the hub is offset by the support platform 21 supporting the arc-shaped seat 14. This prevents the rotating structure formed between the rotating column 15 and the positioning assembly 22 from being damaged by the impact force of the drop hammer mechanism 40, thus ensuring its accuracy.

[0059] Combination Figure 4 and Figure 5The slide assembly 33 includes a movable stage 331 and a guide rail 332. The movable stage 331 is movably mounted on the upper side of the guide rail 332. A limiting arc block (226) is provided on the lower surface of the upper clamping block (221). A positioning groove (16) for the limiting arc block (226) is formed on the surface of the rotating column (15). The limiting arc block (226) is movable inside the positioning groove 16 and limits it in the axial direction of the positioning groove 16, thereby preventing the adjusting plate 11 from shifting in the axial direction of the rotating column 15.

[0060] Combination Figure 4 , Figure 7 and Figure 8 A second spring 35 is provided at one end of the guide rail 332 near the bearing mechanism 20. The second spring 35 elastically pulls the moving platform 331 to slide towards the bearing mechanism 20. After the angle of the adjusting plate 11 is adjusted by the hydraulic cylinder 12, the second spring 35 pulls the moving platform 331 to ensure that the stop bar 31 is tightly attached to the upper surface of the adjusting plate 11, so as to prevent one end of the adjusting plate 11 from rising due to the impact of the drop hammer mechanism 40.

[0061] Combination Figures 7-8 The guide rail (332) is provided with a locking component (34) at the end away from the bearing mechanism (20). The locking component (34) locks the moving platform (331) at one end of the guide rail (332). Before adjusting the angle of the adjusting plate (11) by the hydraulic cylinder (12), the position of the moving platform (331) is locked at one end of the guide rail (332) by the locking component (34) to avoid the position of the stop bar (31) blocking one end of the adjusting plate (11).

[0062] Specifically, the locking component (34) includes a buckle plate (341) rotatably disposed at one end of the guide rail (332), a torsion spring (342) sleeved on the rotation shaft of the buckle plate (341), and a lever plate (343) is also provided at one end of the buckle plate (341).

[0063] The mobile platform (331) has a buckle groove (333) at one end of the buckle plate (341), and the buckle plate (341) and the buckle groove (333) are fitted and snapped together.

[0064] When the moving platform (331) moves toward the buckle plate (341), the buckle plate (341) will, under the elastic force of the torsion spring (342), put one end of the buckle into the inside of the buckle groove (333), thereby limiting the movement of the moving platform (331). After the angle adjustment plate (11) is adjusted, by pressing the lever (343), the buckle at one end of the buckle plate (341) will disengage from the inside of the buckle groove (333). Then, under the elastic pull of the second spring (35), the moving platform (331) will press the stop bar (31) against the upper surface of the angle adjustment plate (11).

[0065] Combination Figure 9 The lower side of the stop lever 31 is provided with a contact surface 311, which movably contacts the upper surface of the adjusting plate 11. This increases the contact area between the stop lever 31 and the adjusting plate 11. Meanwhile, the upper surface of the adjusting plate 11 is also provided with a rough portion. The contact surface 311 and the rough portion make frictional contact. When the drop hammer mechanism 40 impacts the hub, causing the end of the adjusting plate 11 near the stop lever 31 to tend to rise, the force between the inclined adjusting plate 11 and the stop lever 31 will be perpendicular to the surface of the adjusting plate 11. Therefore, the horizontal component of this force easily causes the stop lever 31 to slide to one end. By providing a rough portion on the surface of the adjusting plate 11, this horizontal component can be counteracted, preventing the stop lever 31 from shifting due to the horizontal component. This helps ensure the protection of the hydraulic cylinder 12 and the accuracy of the tilt angle of the adjusting plate 11.

[0066] Combination Figure 10 The lower surface of the angle adjusting plate 11 is provided with reinforcing ribs 17. This can further improve the rigidity of the angle adjusting plate 11 and prevent the plate itself from bending.

[0067] Combination Figure 2 An impact testing machine includes a drop hammer mechanism 40 and a control mechanism (not shown) for controlling the lifting and lowering of the drop hammer mechanism 40. A hub bearing device as described above is mounted below the drop hammer mechanism 40. The impact-bearing area of ​​the hub mounted on the hub bearing device is located directly below the drop hammer mechanism 40.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hub bearing device, characterized in that, include: A base plate (10) is provided on the upper side of the base plate (10) and an adjusting plate (11) is movably mounted on the upper side via a hydraulic cylinder (12). A fixed seat (13) is fixedly mounted on the upper surface of the adjusting plate (11). An arc-shaped seat (14) is fixedly mounted on the lower surface of one end of the adjusting plate (11). The fixed seat (13) is located above the arc-shaped seat (14). Rotating columns (15) are coaxially arranged on both sides of the arc-shaped seat (14). The support mechanism (20) includes a support platform (21) disposed below the arc-shaped seat (14) and a positioning assembly (22) for rotating the rotating column (15) for rotational assembly. The upper side of the support platform (21) is provided with a concave arc surface (211) adapted to fit the lower arc surface of the arc-shaped seat (14). One end of the hydraulic cylinder (12) is connected to the end of the angle adjusting plate (11) away from the arc-shaped seat (14). The stabilizing mechanism (30) includes a stop bar (31), which is supported on the upper side of the angle adjustment plate (11) by a support frame (32) provided at both ends, and a slide assembly (33) is provided on the lower side of the support frame (32).

2. The hub bearing device according to claim 1, characterized in that: The positioning component (22) includes an upper clamping block (221) and a lower clamping block (222), and a clamping cavity for rotating and holding the rotating column (15) is formed between the upper clamping block (221) and the lower clamping block (222).

3. A hub bearing device according to claim 2, characterized in that: The upper surface of the base plate (10) is provided with a side support frame (23) for fixing and supporting the upper clamping block (221). The upper clamping block (221) is provided with a connecting rod (223) on its lower side. The lower clamping block (222) has an assembly groove for inserting the connecting rod (223) on its surface. One end of the connecting rod (223) is provided with a nut (224) and a spring (225). The spring (225) elastically pushes the lower clamping block (222) towards the upper clamping block (221).

4. A hub bearing device according to claim 3, characterized in that: The lower surface of the upper clamping block (221) is provided with a limiting arc block (226), and the surface of the rotating column (15) is provided with a positioning groove (16) for the limiting arc block (226).

5. A hub bearing device according to claim 1, characterized in that: The slide assembly (33) includes a movable stage (331) and a guide rail (332). The movable stage (331) is movably mounted on the upper side of the guide rail (332). A second spring (35) is provided at one end of the guide rail (332) near the bearing mechanism (20). The second spring (35) elastically pulls the movable stage (331) to slide towards the bearing mechanism (20).

6. A hub bearing device according to claim 5, characterized in that: A locking component (34) is provided at the end of the guide rail (332) away from the bearing mechanism (20), and the locking component (34) locks the moving stage (331) to one end of the guide rail (332).

7. A hub bearing device according to claim 6, characterized in that: The locking component (34) includes a buckle plate (341) rotatably disposed at one end of the guide rail (332), a torsion spring (342) sleeved on the rotation shaft of the buckle plate (341), and a lever plate (343) is also provided at one end of the buckle plate (341). The mobile platform (331) has a buckle groove (333) at one end of the buckle plate (341), and the buckle plate (341) and the buckle groove (333) are fitted and snapped together.

8. A hub bearing device according to claim 1, characterized in that: The lower side of the stop bar (31) is provided with a contact surface (311), and the contact surface (311) is in contact with the upper surface of the angle adjustment plate (11); The upper surface of the adjusting plate (11) is provided with a rough part, and the mating plane (311) is in frictional contact with the rough part.

9. A hub bearing device according to claim 1, characterized in that: The lower surface of the angle adjustment plate (11) is provided with reinforcing ribs (17).

10. An impact testing machine, characterized in that: It includes a drop hammer mechanism (40) and a control mechanism for controlling the lifting and lowering of the drop hammer mechanism (40), wherein a hub bearing device according to any one of the preceding claims is mounted below the drop hammer mechanism (40); The impact area of ​​the wheel hub mounted on the wheel hub bearing device is located directly below the drop hammer mechanism (40).

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