Electric vehicle drive motor bearing testing device

Abstract

This application relates to a bearing testing device for electric vehicle drive motors, comprising a worktable, a test motor, and a testing mechanism. Both the test motor and the testing mechanism are fixedly connected to the worktable. The bearing testing device also includes a mounting mechanism, which comprises an inner fixing component and an outer clamping component. The inner fixing component includes a connecting piece, a slider, a rear cover plate, and a guide cylinder. The output shaft of the test motor is coaxially fixedly connected to the rear cover plate, and the rear cover plate is coaxially fixedly connected to the guide cylinder. Multiple connecting pieces and sliders are provided, and each corresponds to one of them. The slider slides along the radial direction of the guide cylinder and abuts against the inner ring of the bearing. A transmission component is provided on the worktable, with one end of the connecting piece rotatably connected to the slider, and the other end of the connecting piece connected to the rear cover plate via the transmission component. The outer clamping component is connected to the worktable to clamp the outer ring of the bearing. This application, by setting up a mounting mechanism, facilitates operation by testing personnel when testing bearings of different sizes.

Description

Technical Field

[0001] This application relates to the technical field of bearing testing, and in particular to a testing device for bearings of electric vehicle drive motors. Background Technology

[0002] The drive motor bearing in an electric vehicle is a core component of the drive motor, and its performance directly affects the motor's efficiency, noise, reliability, and service life. Electric vehicles frequently start and stop, which exposes the drive motor bearing to high variable loads, directly causing instantaneous temperature rise and cumulative heat effects. Therefore, temperature monitoring equipment is required to monitor the temperature of the motor bearing during the manufacturing process.

[0003] Chinese patent CN223091534U, published in the relevant technology, proposes a bearing testing device, including a workbench and a test motor, wherein the test motor is mounted on the workbench. The device also includes a mounting structure and a testing structure. The mounting structure is mounted on the workbench, and the testing structure is mounted on the workbench. The testing structure includes a mounting plate, a pushing component, a shifting component, and a testing component. The mounting plate is mounted on the workbench, the pushing component is mounted on the mounting plate, the shifting component is mounted on the mounting plate, and the testing component is mounted on the shifting component.

[0004] The aforementioned technologies have the following drawbacks: when testing bearings of different sizes, staff need to change different testing devices according to the inner and outer ring dimensions of the bearing being tested, which makes the operation of the testing personnel inconvenient. Utility Model Content

[0005] To address the issue of needing to change different testing devices when testing bearings of different sizes, which is inconvenient for testing personnel, this application provides a testing device for electric vehicle drive motor bearings.

[0006] The electric vehicle drive motor bearing testing device provided in this application adopts the following technical solution:

[0007] An electric vehicle drive motor bearing testing device includes a workbench, a test motor, and a testing mechanism. Both the test motor and the testing mechanism are fixedly connected to the workbench. The device further includes a mounting mechanism comprising an inner fixing component and an outer clamping component. The inner fixing component includes a connecting piece, a slider, a rear cover plate, and a guide cylinder. The output shaft of the test motor is coaxially and fixedly connected to the rear cover plate, and the rear cover plate is coaxially and fixedly connected to the guide cylinder. Multiple connecting pieces and sliders are provided, with each connecting piece corresponding to a slider. The slider slides along the radial direction of the guide cylinder and is used to abut against the inner ring of the bearing. One end of the connecting piece is rotatably connected to the slider, and the other end of the connecting piece is connected to the rear cover plate via a transmission component. The outer clamping component is connected to the workbench to clamp the outer ring of the bearing.

[0008] By adopting the above technical solution and setting up an installation mechanism, the purpose of facilitating operation by testing personnel when inspecting bearings of different sizes can be achieved.

[0009] Furthermore, the transmission assembly includes a coupling shaft, an internal gear ring, planetary gears, and a front cover plate; the front cover plate is fixedly connected to the internal gear ring, which is located inside a guide cylinder and rotatably connected to the guide cylinder coaxially; the planetary gears are rotatably connected to the rear cover plate and mesh with the internal gear ring; multiple planetary gears are provided, each corresponding to a connecting piece, and the connecting piece is rotatably connected to the corresponding planetary gear, with the rotation axis of the connecting piece spaced apart from the axis of the planetary gear; one end of the coupling shaft is threadedly connected to the rear cover plate, and the other end of the coupling shaft extends out of the front cover plate, with the axis of the coupling shaft collinear with the axis of the internal gear ring; the coupling shaft is keyed to the front cover plate and is capable of relative displacement with the front cover plate.

[0010] By adopting the above technical solution, the internal gear ring is rotated by rotating the connecting shaft, which in turn drives the planetary gears to rotate, thereby realizing the rotation of the connecting piece. As a result, the slider can extend or retract under the drive of the connecting piece.

[0011] Furthermore, a cylindrical head is coaxially fixedly connected to one end of the connecting shaft away from the front cover plate, and one end of the cylindrical head is provided with an internal hexagonal groove.

[0012] By adopting the above technical solution, testers use tools to rotate the cylindrical head, thereby achieving the rotation of the connecting shaft and thus controlling the extension or retraction of the slider.

[0013] Furthermore, the external clamping assembly includes a guide rail and clamping plates, the guide rail being fixedly connected to the worktable; two clamping plates are provided, and the two clamping plates are respectively located on both sides of the bearing; both clamping plates are slidably connected to the guide rail along the length direction of the guide rail, and the clamping plates abut against the corresponding sides of the bearing; a driving assembly for driving the two clamping plates to move is provided on the worktable.

[0014] By adopting the above technical solution, the two clamping plates can move along the length of the guide rail, thus enabling the clamping of the outer rings of bearings of different sizes.

[0015] Furthermore, the drive assembly includes a first motor, a first connecting rod, and a second connecting rod. The first motor is fixedly connected to the worktable, and the output shaft of the first motor is connected to the first connecting rod. The first connecting rod is located between two clamping plates, and there are two second connecting rods, which are respectively located on both sides of the first connecting rod. One end of the second connecting rod is rotatably connected to the corresponding side of the first connecting rod, and the other end of the second connecting rod is rotatably connected to the clamping plate on the corresponding side.

[0016] By adopting the above technical solution, after the first motor is started, the output shaft of the first motor drives the rotation of the first connecting rod, and the first connecting rod can drive the second connecting rods on both sides to rotate synchronously, thereby realizing the mutual approach and distance of the two clamping plates.

[0017] Furthermore, a pad is fixedly connected to the slider, and the side of the pad facing away from the slider is set as an arc-shaped surface; a rubber pad is fixedly connected to the arc-shaped surface of the slider, and the rubber pad can abut against the inner ring of the bearing.

[0018] By adopting the above technical solution, by setting one side of the pad to an arc surface and fixing a rubber pad on it, the friction between the pad and the inner ring of the bearing can be increased, so that the test motor can drive the inner ring of the bearing to rotate more stably.

[0019] Furthermore, the two clamping plates are V-shaped on the side near the bearing, and a rubber pad is fixedly connected to each of the two clamping plates, the rubber pad abutting against the outer ring of the bearing.

[0020] By adopting the above technical solution, by setting the clamping plate to a V-shape and setting a rubber pad on the clamping plate, the friction between the clamping plate and the outer ring of the bearing can be increased, so that the two clamping plates can better clamp the outer ring of the bearing and achieve the fixation of the outer ring of the bearing when the inner ring of the bearing rotates.

[0021] Furthermore, the rotation direction of the output shaft of the test motor is consistent with the direction of the thread tightening on the coupling.

[0022] By adopting the above technical solution, the risk of the coupling separating from the rear cover plate when the output shaft of the test motor rotates is reduced.

[0023] In summary, the beneficial technical effects of this application are as follows:

[0024] 1. By setting up an internal fastening component, the output shaft of the test motor can drive the inner ring of bearings of different sizes to rotate. Then, by using an external clamping component to clamp the outer ring of the bearing, it is possible to clamp the outer ring of bearings of different sizes, thereby facilitating the operation of testers when testing bearings of different sizes.

[0025] 2. By setting multiple planetary gears to mesh with the internal gear ring, the tester can rotate the connecting shaft to achieve the synchronous extension or retraction of multiple sliders, which is convenient for adjustment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the overall structure of the installation mechanism in the embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the overall structure of the internal solid component and the transmission component in the embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the overall structure of the external clamping component and the driving component in the embodiments of this application;

[0030] Figure 5 This is a schematic diagram of the overall structure of the testing mechanism in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Workbench; 2. Test motor; 3. Testing mechanism; 31. Mounting plate; 32. Rotary disk; 33. Electric push rod; 34. Gear; 35. Rack; 36. Tester; 4. Mounting mechanism; 5. Internal fastener assembly; 51. Connecting piece; 52. Slider; 53. Rear cover plate; 54. Guide cylinder; 55. Sleeve; 56. Pad plate; 6. External clamping assembly; 61. Guide rail; 62. Clamping plate; 7. Transmission assembly; 71. Coupling shaft; 72. Internal gear ring; 73. Planetary gear; 74. Front cover plate; 75. Cylindrical head; 8. Drive assembly; 81. First motor; 82. Motor bracket; 83. First rotating shaft; 84. Rotating shaft bracket; 85. First bevel gear; 86. Second bevel gear; 87. Second rotating shaft; 88. First connecting rod; 89. Second connecting rod; 9. Bearing. Detailed Implementation

[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] This application discloses an electric vehicle drive motor bearing testing device. (Refer to...) Figure 1 It includes a workbench 1, a test motor 2, a testing mechanism 3, and an installation mechanism 4, with the test motor 2 fixedly connected to the workbench 1.

[0035] Reference Figure 2 The mounting mechanism 4 includes an inner fixing component 5, an outer clamping component 6, a transmission component 7, and a drive component 8.

[0036] Reference Figure 3 The internal solid assembly 5 includes a connecting piece 51, a slider 52, a rear cover plate 53, a guide cylinder 54, a sleeve 55, and a pad 56. The rear cover plate 53 is circular. One end of the sleeve 55 is coaxially and fixedly connected to the output shaft of the test motor 2, and the other end of the sleeve 55 is coaxially and fixedly connected to the rear cover plate 53. The rear cover plate 53 is coaxially and fixedly connected to the guide cylinder 54. Multiple connecting pieces 51 and sliders 52 are provided. In this embodiment, three connecting pieces 51 and three sliders 52 are provided, with each connecting piece 51 corresponding to a slider 52. Multiple grooves are formed radially on the peripheral wall of the guide cylinder 54. Each groove corresponds to a slider 52, and the slider 52 slides against the inner wall of the groove. The pad 56 is fixedly connected to the slider 52. The side of the pad 56 facing away from the slider 52 is set as an arc-shaped surface, and a rubber pad is fixedly connected to the arc-shaped surface. The rubber pad abuts against the inner ring of the bearing 9. One end of the connecting piece 51 is rotatably connected to the slider 52, and the other end of the connecting piece 51 is connected to the rear cover plate 53 through the transmission assembly 7.

[0037] The transmission assembly 7 includes a coupling 71, an internal gear ring 72, planetary gears 73, a front cover plate 74, and a cylindrical head 75. The front cover plate 74 is fixedly connected to the internal gear ring 72, which is located inside the guide cylinder 54 and is rotatably connected to the guide cylinder 54. The planetary gears 73 are rotatably connected to the rear cover plate 53 and mesh with the internal gear ring 72. There are three planetary gears 73, and each planetary gear 73 corresponds to a connecting piece 51. The end of the connecting piece 51 facing away from the slider 52 is rotatably connected to the corresponding planetary gear 73, and the axis of rotation of the connecting piece 51 is spaced apart from the axis of rotation of the planetary gear 73. One end of the coupling 71 extends out of the rear cover plate 53 and is threadedly connected to both the rear cover plate 53 and the sleeve 55. The other end of the coupling 71 extends out of the front cover plate 74 and is fixedly connected to the cylindrical head 75 coaxially. The end of the cylindrical head 75 facing away from the rotating shaft has an internal hexagonal groove. The axes of the coupling 71 and the internal gear ring 72 are collinear. The coupling 71 is keyed to the front cover plate 74 and can move relative to the front cover plate 74. In order to reduce the risk of the coupling 71 disengaging from the rear cover plate 53 when the output shaft of the test motor 2 rotates, the rotation direction of the output shaft of the test motor 2 is consistent with the direction of the thread tightening on the coupling 71.

[0038] When the test motor 2 needs to drive the inner rings of bearings 9 of different sizes to rotate, the tester needs to adjust the extension or retraction of the slider 52. The tester uses a tool to rotate the cylindrical head 75, which in turn drives the coupling shaft 71 to rotate. One end of the coupling shaft 71 is threadedly connected to the sleeve 55, and the coupling shaft 71 moves inside the sleeve 55 while rotating. The coupling shaft 71 is keyed to the front cover plate 74, and both the front cover plate 74 and the internal gear ring 72 rotate with the rotation of the coupling shaft 71. The rotation of the internal gear ring 72 drives the planetary gear 73 to rotate. The rotation of the planetary gear 73 drives the connecting piece 51 on it to rotate, thereby extending or retracting the slider 52 to support the inner rings of bearings 9 of different sizes. After adjustment, the test motor 2 is started. The output shaft of the test motor 2 drives the rear cover plate 53 and the guide cylinder 54 to rotate through the sleeve 55. The coupling shaft 71 drives the front cover plate 74 and the internal gear ring 72 to rotate through the key, thereby achieving a fixed extension of the slider 52 while driving the inner ring of the bearing 9 to rotate.

[0039] Reference Figure 4 The outer clamping assembly 6 includes a guide rail 61 and clamping plates 62. The side of the guide rail 61 facing away from the bearing 9 is fixedly connected to the worktable 1. Two clamping plates 62 are provided, and the two clamping plates 62 are respectively located on both sides of the bearing 9. Both clamping plates 62 are slidably connected to the guide rail 61 along the length direction of the guide rail 61. The side of the two clamping plates 62 near the bearing 9 is set in a V-shape, and rubber pads are provided on the two clamping plates 62. The rubber pads can abut against the corresponding side of the outer ring of the bearing 9.

[0040] The drive assembly 8 includes a first motor 81, a motor bracket 82, a first rotating shaft 83, a rotating shaft bracket 84, a first bevel gear 85, a second bevel gear 86, a second rotating shaft 87, a first connecting rod 88, and a second connecting rod 89. The motor bracket 82 is fixedly connected to the worktable 1, the first motor 81 is fixedly connected to the motor bracket 82, and the guide rail 61 is fixedly connected to the motor bracket 82. The output shaft of the first motor 81 is coaxially fixedly connected to the first rotating shaft 83, the first rotating shaft 83 is rotatably connected to the rotating shaft bracket 84, and the rotating shaft bracket 84 is fixed to the motor bracket 82. The first rotating shaft 83 is coaxially fixedly connected to the first bevel gear 85, and the second bevel gear 86 meshes with the first bevel gear 85. The second rotating shaft 87 extends out of the guide rail 61 and is rotatably connected to the guide rail 61. One end of the second rotating shaft 87 is coaxially fixed to the second bevel gear 86, and the other end of the second rotating shaft 87 is fixedly connected to the first connecting rod 88. The first connecting rod 88 is located between the two clamping plates 62. There are two second connecting rods 89, which are respectively located on both sides of the first connecting rod 88. One end of the second connecting rod 89 is rotatably connected to the corresponding side of the first connecting rod 88, and the other end of the second connecting rod 89 is rotatably connected to the corresponding side of the clamping plate 62.

[0041] After supporting the inner ring of bearing 9 is completed, the first motor 81 is started. The rotation of the output shaft of the first motor 81 drives the first bevel gear 85 to rotate. The first bevel gear 85 meshes with the second bevel gear 86, which in turn drives the second bevel gear 86 to rotate. The second bevel gear 86 drives the first connecting rod 88 to rotate, and the second connecting rods 89 at both ends of the first connecting rod 88 also rotate accordingly. The rotation of the two second connecting rods 89 simultaneously causes the corresponding clamping plates 62 to move closer or further apart along the guide rail 61, thereby enabling the clamping of outer rings of bearings 9 of different sizes.

[0042] Reference Figure 5 The testing mechanism 3 includes a mounting plate 31, a rotating disk 32, an electric push rod 33, a gear 34, a rack 35, and a testing instrument 36, which uses an infrared thermometer. The mounting plate 31 is fixedly connected to one side of the workbench 1 and is perpendicular to the output shaft of the testing motor 2. The rotating disk 32 passes through the mounting plate 31 and is rotatably connected to it. The side of the rotating disk 32 closest to the bearing 9 is fixedly connected to the testing instrument 36, and the other side is fixedly connected to the gear 34. The electric push rod 33 is fixedly connected to the mounting plate 31 and to the rack 35, which meshes with the gear 34. The testing instrument 36 is detachably connected to the rotating disk 32 via bolts, allowing operators to adjust its position according to the bearing dimensions.

[0043] When it is necessary to change the detection position of the tester 36, the tester activates the electric push rod 33. The electric push rod 33 pushes the rack 35 to move, and the rack 35 meshes with the gear 34, thereby driving the gear 34 to rotate. The rotation of the gear 34 drives the rotating disk 32 to rotate, which in turn drives the tester 36 on the rotating disk 32, thus realizing the change of the detection position of the tester 36.

[0044] The implementation principle of the electric vehicle drive motor bearing detection device in this application embodiment is as follows:

[0045] When temperature testing of bearing 9 is required, the tester places bearing 9 on pad 56. The tester uses a tool to rotate the cylindrical head 75, causing the connecting shaft 71 to rotate. Simultaneously, the connecting shaft 71 moves inside the sleeve 55. The connecting shaft 71 is connected to the front cover plate 74 via a key. Both the front cover plate 74 and the internal gear ring 72 rotate with the rotation of the connecting shaft 71. The rotation of the internal gear ring 72 drives the planetary gear 73 to rotate. The rotation of the planetary gear 73 drives the connecting piece 51 on it to rotate, which in turn moves the slider 52, causing all three pads 56 to contact the inner ring of bearing 9, thus supporting the inner ring of bearing 9.

[0046] The tester restarts the first motor 81. The rotation of the output shaft of the first motor 81 drives the rotation of the second bevel gear 86, which in turn causes the first connecting rod 88 to rotate. Consequently, the second connecting rods 89 at both ends of the first connecting rod 88 also rotate. The rotation of the two second connecting rods 89 simultaneously causes the corresponding clamping plates 62 to move along the guide rail 61, thereby clamping the outer ring of the bearing 9.

[0047] The tester then started the test motor 2. The output shaft of the test motor 2 drives the rear cover plate 53 and guide cylinder 54 to rotate through the sleeve 55. The connecting shaft 71 drives the front cover plate 74 and internal gear ring 72 to rotate through the key, thereby fixing the extension of the slider 52 while driving the inner ring of the bearing 9 to rotate. Thus, the outer ring of the bearing 9 is fixed while the inner ring rotates.

[0048] When it is necessary to change the detection position of the tester 36, the tester activates the electric push rod 33. The electric push rod 33 pushes the rack 35 to move, which in turn drives the gear 34 to rotate. The rotation of the gear 34 drives the rotating disk 32 to rotate, which in turn drives the tester 36 on the rotating disk 32, thus realizing the change of the detection position of the tester 36.

[0049] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bearing testing device for an electric vehicle drive motor, comprising a workbench (1), a test motor (2), and a testing mechanism (3), wherein the test motor (2) and the testing mechanism (3) are both fixedly connected to the workbench (1), characterized in that, The bearing testing device further includes an installation mechanism (4), which includes an inner fastening component (5) and an outer clamping component (6). The inner fastening component (5) includes a connecting piece (51), a slider (52), a rear cover plate (53), and a guide cylinder (54). The output shaft of the test motor (2) is coaxially and fixedly connected to the rear cover plate (53), and the rear cover plate (53) is coaxially and fixedly connected to the guide cylinder (54). Multiple connecting pieces (51) and multiple sliders (52) are provided. The plate (51) corresponds one-to-one with the slider (52); the slider (52) slides along the radial direction of the guide cylinder (54) and is connected to the guide cylinder (54), and the slider (52) is used to abut against the inner ring of the bearing (9); one end of the connecting plate (51) is rotatably connected to the slider (52), and the other end of the connecting plate (51) is connected to the rear cover plate (53) through the transmission assembly (7); the outer clamping assembly (6) is connected to the worktable (1) to clamp the outer ring of the bearing (9).

2. The electric vehicle drive motor bearing testing device according to claim 1, characterized in that, The transmission assembly (7) includes a coupling (71), an internal gear ring (72), planetary gears (73), and a front cover plate (74); the front cover plate (74) is fixedly connected to the internal gear ring (72), the internal gear ring (72) is located inside the guide cylinder (54), and is coaxially rotatably connected to the guide cylinder (54); the planetary gears (73) are rotatably connected to the rear cover plate (53) and mesh with the internal gear ring (72); multiple planetary gears (73) are provided, and each corresponds to one of the connecting pieces (51). The connecting piece (51) is rotatably connected to the corresponding planetary gear (73), and the rotation axis of the connecting piece (51) is spaced apart from the axis of the planetary gear (73); one end of the connecting shaft (71) is threadedly connected to the rear cover plate (53), and the other end of the connecting shaft (71) passes through the front cover plate (74). The axis of the connecting shaft (71) is collinear with the axis of the internal gear ring (72); the connecting shaft (71) is keyed to the front cover plate (74) and can be relatively displaced with the front cover plate (74).

3. The electric vehicle drive motor bearing testing device according to claim 2, characterized in that, The connecting shaft (71) is coaxially fixedly connected to a cylindrical head (75) at one end away from the front cover plate (74), and an internal hexagonal groove is provided at one end of the cylindrical head (75).

4. The electric vehicle drive motor bearing testing device according to claim 3, characterized in that, The external clamping assembly (6) includes a guide rail (61) and a clamping plate (62). The guide rail (61) is fixedly connected to the worktable (1). There are two clamping plates (62), and the two clamping plates (62) are respectively located on both sides of the bearing (9). The two clamping plates (62) are slidably connected to the guide rail (61) along the length direction of the guide rail (61), and the clamping plates (62) abut against the corresponding side of the bearing (9). The worktable (1) is provided with a driving assembly (8) for driving the two clamping plates (62) to move.

5. The electric vehicle drive motor bearing testing device according to claim 4, characterized in that, The drive assembly (8) includes a first motor (81), a first connecting rod (88), and a second connecting rod (89). The first motor (81) is fixedly connected to the worktable (1), and the output shaft of the first motor (81) is connected to the first connecting rod (88). The first connecting rod (88) is located between two clamping plates (62). There are two second connecting rods (89), and the two second connecting rods (89) are respectively located on both sides of the first connecting rod (88). One end of the second connecting rod (89) is rotatably connected to the corresponding side of the first connecting rod (88), and the other end of the second connecting rod (89) is rotatably connected to the clamping plate (62) on the corresponding side.

6. The electric vehicle drive motor bearing testing device according to claim 5, characterized in that, A pad (56) is fixedly connected to the slider (52), and the side of the pad (56) away from the slider (52) is set as an arc surface; and a rubber pad is fixedly connected to the arc surface of the slider (52), and the rubber pad can abut against the inner ring of the bearing (9).

7. The electric vehicle drive motor bearing testing device according to claim 6, characterized in that, The two clamps (62) are V-shaped on the side near the bearing (9), and rubber pads are fixedly connected to both clamps (62), with the rubber pads abutting against the outer ring of the bearing (9).

8. The electric vehicle drive motor bearing testing device according to claim 7, characterized in that, The rotation direction of the output shaft of the test motor (2) is consistent with the direction of the thread tightening on the connecting shaft (71).

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