Automobile wheel end dragging torque measuring device and method based on angular displacement

Abstract

The invention provides an automobile wheel end dragging torque measuring device and method based on angular displacement, the automobile wheel end dragging torque measuring device comprises a clamping device, a measuring device and a signal processing display device, the clamping device comprises three clamping jaw assemblies with adjustable lengths, the clamping jaw assemblies are used for being clamped on rims with different sizes, and the measuring device is used for measuring the dragging torque of the automobile wheel end. The measuring device comprises a rotating handle, one end of the rotating handle is provided with a torque sensor and an angular displacement sensor, the angular displacement sensor is provided with a gravity member, the gravity member comprises a connecting ring and a gravity block, the connecting ring sleeves the angular displacement sensor and is rotatably connected with the angular displacement sensor, and the connecting ring is provided with a locking member. The locking piece is connected with a rotating shaft of the angular displacement sensor, the gravity block is fixedly arranged on the connecting ring, and the signal processing display device is used for displaying a curve of torque changing along with angular displacement and prompting the rotating speed and force. The device is light and convenient to carry, and is suitable for measuring the dragging torque of the wheel end of the automobile in various scenes.

Description

Technical Field

[0001] The invention relates to the technical field of automobile wheel end drag torque measurement, and in particular to an automobile wheel end drag torque measurement device and a measurement method based on angular displacement. Background Art

[0002] The existing device for measuring the drag torque of the automobile wheel end is fixed by supporting the measuring device on a floor frame. The measuring device includes a motor, a transmission mechanism, a torque sensor, and a wheel clamping device. The motor torque is transmitted to the wheel clamping device through the transmission mechanism and the torque sensor to measure the wheel rotation drag torque. Some existing measuring devices are large in size and heavy in weight, which makes them inconvenient to carry. This limits the use of the measuring device in various scenarios, especially when frequent movement or testing in different locations is required. Summary of the invention

[0003] The purpose of the present invention is to address the defects of the prior art and provide a vehicle wheel end drag torque measurement device and measurement method based on angular displacement. The device is light and easy to carry and is suitable for measuring vehicle wheel end drag torque in various scenarios.

[0004] In order to solve the above technical problems, in a first aspect, the present invention provides an angular displacement-based automobile wheel-end drag torque measuring device, comprising a clamping device and a measuring device, wherein the clamping device is used to clamp on the rim, and the measuring device comprises a rotating handle, a torque sensor and an angular displacement sensor are arranged at one end of the rotating handle, a gravity piece is arranged on the angular displacement sensor, and the gravity piece comprises a connecting ring and a gravity block, the connecting ring is sleeved on the angular displacement sensor and is rotatably connected to the angular displacement sensor, a locking piece is arranged on the connecting ring, and the locking piece is connected to the rotating shaft of the angular displacement sensor and is used to limit the rotation of the rotating shaft of the angular displacement sensor, and the gravity block is fixedly arranged on the connecting ring.

[0005] Furthermore, the rotating handle is plugged into a torque sensor.

[0006] Furthermore, a square column is provided at one end of the torque sensor, a connecting piece is provided at one end of the rotating handle, a square hole is opened on one side of the connecting piece, the rotating handle and the torque sensor are plugged in through the square column and the square hole, and the angular displacement sensor is fixedly provided on the other side of the connecting piece.

[0007] In some embodiments, the clamping device includes a mounting plate, a gear is rotatably arranged on the mounting plate, a plurality of claw assemblies are slidably arranged on the mounting plate, the claw assembly includes a rack, the rack is meshed with the gear, and the gear is used to drive the plurality of claw assemblies to contract simultaneously, so that the clamping device is fixed on the rim and the axis of the gear passes through the center of the wheel.

[0008] Furthermore, a transmission shaft is rotatably arranged on the mounting plate, the gear is arranged on the transmission shaft, a worm wheel is arranged on the transmission shaft, a mounting bracket is arranged on the mounting plate, a worm is rotatably arranged on the mounting bracket, the worm is meshed with the worm wheel, a hexagonal column is arranged on the top of the worm, and a wrench can be used to drive the worm to rotate, thereby driving the gear to rotate.

[0009] Furthermore, the mounting plate includes a bottom mounting plate, a middle mounting plate, and a top mounting plate, the bottom mounting plate and the top mounting plate are respectively fixedly arranged on both sides of the middle mounting plate, the transmission shaft is rotatably connected to the middle mounting plate, the worm and the worm wheel are arranged between the middle mounting plate and the top mounting plate, the gear is arranged between the middle mounting plate and the bottom mounting plate, a plurality of connecting columns are arranged between the middle mounting plate and the bottom mounting plate and between the middle mounting plate and the top mounting plate, the connecting columns are arranged perpendicular to the middle mounting plate, the rack of the claw assembly is arranged between the connecting columns and the gears, and the connecting columns are used to connect the middle mounting plate and the top mounting plate.

[0010] Furthermore, a plurality of elongated holes are provided on the bottom mounting plate, and the plurality of elongated holes are arranged one-to-one corresponding to the plurality of claw assemblies, two limiting members are provided on the rack, rollers are provided on the limiting members, and the two limiting members are inserted into the elongated holes, thereby limiting the telescopic range and telescopic direction of the claw assembly.

[0011] In some embodiments, the claw assembly includes a claw and a connecting rod, a plurality of adjustment holes are provided on the claw, and the plurality of adjustment holes are arranged along the length direction of the claw assembly, one end of the connecting rod is connected to the rack, and the other end of the connecting rod is connected to the claw through the adjustment hole.

[0012] In some embodiments, a signal processing display device is included, which is connected to the torque sensor and the angular displacement sensor. The signal processing display device includes a signal acquisition module, a signal processing module, a display module, and an indicator light module. The indicator light module includes multiple indicator lights. The signal acquisition module is used to collect the torque signal of the torque sensor and the angular displacement signal of the angular displacement sensor. The signal processing module is used to control different indicator lights to turn on according to the values ​​of angular velocity and angular acceleration to indicate whether the rotation speed and rotation force of the rotating handle meet the requirements. The display module is used to display a curve of torque changing with angular displacement.

[0013] In a second aspect, the present invention provides a method for measuring a vehicle wheel end drag torque measurement device based on angular displacement, comprising:

[0014] The length of the clamping jaw assembly of the clamping device is adjusted, and the worm is rotated, so that multiple clamping jaw assemblies are simultaneously contracted and clamped on the rim of the wheel, and the axis of the gear passes through the center of the wheel;

[0015] Connect the rotating handle to the torque sensor;

[0016] Turn the handle at a constant speed and observe the indicator light of the signal processing display device. When the indicator light corresponding to the required values ​​of angular velocity and angular acceleration is on, maintain the current speed and continue measuring.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention provides a rotating handle. When the wheel is rotated by the rotating handle, the torque sensor and the angular displacement sensor will rotate with the wheel. The torque sensor on the rotating handle can directly detect the torque. Since a gravity piece is provided, the gravity piece limits the rotation of the rotating shaft of the angular displacement sensor under the action of gravity, thereby realizing the relative rotation of the base and the rotating shaft of the angular displacement sensor, so that the wheel drag torque at different rotation angles can be measured, and the angular positions corresponding to the maximum value point and the minimum value point of the drag torque can be accurately identified.

[0019] 2. The rotating handle of the present invention is plugged into the torque sensor, so that the rotating handle can be removed from the torque sensor. This saves effort when clamping the clamping device on the wheel, and makes it easier to store the device when carrying.

[0020] 3. The present invention provides a gear and a claw assembly with a rack, and drives the gear to rotate so that multiple claw assemblies can be simultaneously retracted, ensuring that the axis of the gear passes through the center of the wheel when the clamping device is fixed on the rim.

[0021] 4. The present invention provides a worm wheel and a worm, and the worm drives the worm wheel and the gear to rotate. The worm and the worm wheel can be self-locking, and the rotation can be transmitted from the worm to the worm wheel, but cannot be transmitted from the worm wheel to the worm, so that the claw assembly is stably clamped on the rim.

[0022] 5. The gear and claw assembly of the present invention are arranged on one side of the middle mounting plate, and the worm and worm wheel are arranged on the other side of the middle mounting plate, so the structure is compact.

[0023] 6. The middle mounting plate of the present invention is provided with a plurality of connecting columns, which are used to connect the bottom mounting plate and the top mounting plate. The gear and the claw assembly are arranged on one side of the middle mounting plate, and the worm and the worm wheel are arranged on the other side of the middle mounting plate, and the structure is compact.

[0024] 7. The present invention provides a plurality of adjustment holes on the claws, so that the length of the claw assembly can be adjusted as required, and is suitable for wheels of different specifications.

[0025] 8. The signal processing and display device of the present invention receives and processes the signals of the angular displacement sensor and the torque sensor, and displays the curve of the torque changing with the angular displacement through the display screen integrated on the controller, which can accurately identify the angular positions corresponding to the maximum and minimum points of the drag torque; by setting a plurality of indicator lights, it can assist the operator to control the rotation speed and force more accurately, thereby improving the accuracy of manual measurement.

[0026] 9. The vehicle wheel end drag torque measuring device of the present invention is light and easy to carry, and is suitable for measuring the vehicle wheel end drag torque in various scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an axonometric diagram of the vehicle wheel end drag torque measuring device of the present invention;

[0028] Figure 2 It is an axonometric view of the vehicle wheel end drag torque measuring device of the present invention from another perspective;

[0029] Figure 3 A cross-sectional view of a vehicle wheel end drag torque measuring device according to the present invention;

[0030] Figure 4 An exploded view of the vehicle wheel end drag torque measuring device of the present invention;

[0031] Figure 5 An exploded view of one side of the bottom mounting plate of the clamping device of the present invention;

[0032] Figure 6 An exploded view of one side of the top mounting plate of the clamping device of the present invention;

[0033] Figure 7 An exploded view of the measuring device of the present invention;

[0034] Figure 8 It is a schematic diagram of the present invention in use.

[0035] Reference numerals: clamping device 1; claw assembly 11; rack 111; connecting rod 112; claw 113; stopper 114; adjustment hole 115; gear 12; transmission shaft 13; mounting plate 14; bottom mounting plate 141; long hole 142; middle mounting plate 143; top mounting plate 144; worm wheel 15; worm 16; mounting bracket 17; connecting column 18;

[0036] Measuring device 2; torque sensor 21; square column 211; angular displacement sensor 22; rotating handle 23; mounting seat 24; gravity member 25; connecting ring 251; gravity block 252; locking member 253; bearing 26;

[0037] Signal processing and display device 3. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] like Figure 1 As shown, the present invention provides a vehicle wheel end drag torque measurement device based on angular displacement, including a clamping device 1 and a measuring device 2, as shown in FIG. Figure 3 , 7 As shown, the clamping device 1 is used to clamp on the rim, and the measuring device 2 includes a rotating handle 23. A torque sensor 21 and an angular displacement sensor 22 are arranged at one end of the rotating handle 23. The torque sensor 21 and the angular displacement sensor 22 can rotate together with the rotating handle 23. A gravity member 25 is arranged on the angular displacement sensor 22. The gravity member 25 includes a connecting ring 251 and a gravity block 252. The connecting ring 251 is sleeved on the angular displacement sensor 22 and is rotatably connected to the angular displacement sensor 22. A locking member 253 is arranged on the connecting ring 251. The locking member 253 is connected to the rotating shaft of the angular displacement sensor 22 and is used to limit the rotation of the rotating shaft of the angular displacement sensor 22. The gravity block 252 is fixedly arranged on the connecting ring 251. Among them, the angular displacement sensor 22 is fixed on the mounting seat 24, one end of the mounting seat 24 is fixed to the side of the rotating handle 23 away from the torque sensor 21 by a bolt, the mounting seat 24 and the connecting ring 251 are rotatably connected through a bearing 26, and the locking member 253 can be a bolt, which can limit the rotation of the rotating shaft of the angular displacement sensor 22 by tightly abutting against the rotating shaft of the angular displacement sensor 22.

[0040] It can be understood that when the wheel is rotated by using the rotating handle 23, the torque sensor 21 and the angular displacement sensor 22 will rotate with the wheel. The torque sensor 21 on the rotating handle 23 can directly detect the torque. Since the gravity piece 25 is provided, the gravity piece 25 does not rotate due to the action of gravity and is always in a vertical downward angle position, which limits the rotation of the rotating shaft of the angular displacement sensor 22, thereby realizing the relative rotation of the base and the rotating shaft of the angular displacement sensor 22, thereby measuring the wheel drag torque at different rotation angles, and being able to accurately identify the angular positions corresponding to the maximum and minimum points of the drag torque.

[0041] Furthermore, the rotating handle 23 is plugged into the torque sensor 21 .

[0042] It can be understood that since the rotating handle 23 is plugged into the torque sensor 21, when the clamping device 1 is clamped on the rim, the rotating handle 23, the angular displacement sensor 22, and the gravity member 25 can be removed from the torque sensor 21 in advance, which can save effort in the process of clamping the clamping device 1 on the rim and is easy to store when carrying.

[0043] Furthermore, if Figure 7 As shown, a square column 211 is set at one end of the torque sensor 21, a connecting piece is set at one end of the rotating handle 23, a square hole is opened on one side of the connecting piece, the rotating handle 23 and the torque sensor 21 are plugged through the square column 211 and the square hole, and the angular displacement sensor 22 is fixedly set on the other side of the connecting piece.

[0044] In some embodiments, Figure 1 , 5 As shown, the clamping device 1 includes a mounting plate 14, a gear 12 is rotatably arranged on the mounting plate 14, a plurality of claw assemblies 11 are slidably arranged on the mounting plate 14, the claw assembly 11 includes a rack 111, the rack 111 is meshed with the gear 12, the gear 12 is used to drive the plurality of claw assemblies 11 to contract simultaneously, so that the clamping device 1 is fixed on the rim and the axis of the gear 12 passes through the center of the wheel. Figure 5 In the figure, three claw assemblies 11 are shown, and the angle between any two claw assemblies 11 is 120°.

[0045] The present invention provides a gear 12 and a claw assembly 11 with a rack 111, and drives the gear 12 to rotate so that multiple claw assemblies 11 can be simultaneously contracted, ensuring that the axis of the gear 12 passes through the center of the wheel when the clamping device 1 is fixed on the rim.

[0046] Furthermore, if Figure 5 , 6 As shown, a transmission shaft 13 is rotatably arranged on the mounting plate 14, a gear 12 is arranged on the transmission shaft 13, a worm wheel 15 is arranged on the transmission shaft 13, a mounting bracket 17 is arranged on the mounting plate 14, a worm 16 is rotatably arranged on the mounting bracket 17, the worm 16 is meshed with the worm wheel 15, and the worm 16 is used to drive the gear 12 to rotate through the worm wheel 15. One end of the worm 16 is a hexagonal column 211 and extends out of the mounting plate 14, and can be matched with a wrench.

[0047] The present invention provides a worm wheel 15 and a worm 16, and the worm 16 drives the worm wheel 15 to drive the gear 12 to rotate. The worm 16 and the worm wheel 15 can be self-locking, and the rotation can be transmitted from the worm 16 to the worm wheel 15, but cannot be transmitted from the worm wheel 15 to the worm 16, so that the claw assembly 11 is stably clamped on the rim.

[0048] Furthermore, if Figure 5 , 6As shown, the mounting plate 14 includes a bottom mounting plate 141, a middle mounting plate 143, and a top mounting plate 144. The bottom mounting plate 141 and the top mounting plate 144 are respectively fixedly arranged on both sides of the middle mounting plate 143. The transmission shaft 13 is rotatably connected to the middle mounting plate 143. The worm 16 and the worm wheel 15 are arranged between the middle mounting plate 143 and the top mounting plate 144. The gear 12 is arranged between the middle mounting plate 143 and the bottom mounting plate 141. A plurality of connecting columns 18 are arranged between the middle mounting plate 143 and the bottom mounting plate 141 and between the middle mounting plate 143 and the top mounting plate 144. The connecting columns 18 are arranged perpendicular to the middle mounting plate 143. The rack 111 of the claw assembly 11 is arranged between the connecting columns 18 and the gear 12. The connecting columns 18 are used to connect the middle mounting plate 143 to the bottom mounting plate 141 and the top mounting plate 144, respectively.

[0049] The gear 12 and the claw assembly 11 of the present invention are arranged on one side of the middle mounting plate 143, and the worm 16 and the worm wheel 15 are arranged on the other side of the middle mounting plate 143. The structure is compact and is conducive to reducing the structural volume.

[0050] Furthermore, if Figure 5 As shown, a plurality of elongated holes 142 are provided on the bottom mounting plate 141, and the plurality of elongated holes 142 are arranged one by one corresponding to the plurality of claw assemblies 11, two limiters 114 are provided on the rack 111, rollers are provided on the limiters 114, and the two limiters 114 are inserted into the elongated holes 142, thereby limiting the telescopic range and telescopic direction of the claw assembly 11. By providing rollers on the limiters 114, the sliding friction between the limiters 114 and the elongated holes 142 is converted into rolling friction, thereby reducing the wear of the limiters 114 and the elongated holes 142.

[0051] In some embodiments, Figure 6 As shown, the claw assembly 11 includes a claw 113 and a connecting rod 112. A plurality of adjustment holes 115 are provided on the claw 113. The plurality of adjustment holes 115 are arranged along the length direction of the claw assembly 11. One end of the connecting rod 112 is connected to the rack 111, and the other end of the connecting rod 112 is connected to the claw 113 through the adjustment hole 115.

[0052] In the present invention, a plurality of adjustment holes 115 are provided on the claw 113 so that the length of the claw assembly 11 can be adjusted as required, and is suitable for wheels of different specifications.

[0053] In some embodiments, Figure 1As shown, it also includes a signal processing display device 3, which is connected to the torque sensor 21 and the angular displacement sensor 22. The signal processing display device 3 includes a signal acquisition module, a signal processing module, a display module, and an indicator light module. The indicator light module includes multiple indicator lights. The signal acquisition module is used to collect the torque signal of the torque sensor 21 and the angular displacement signal of the angular displacement sensor 22. The signal processing module is used to control different indicator lights to turn on according to the values ​​of angular velocity and angular acceleration to indicate whether the rotation speed and rotation force of the rotating handle 23 meet the requirements. The display module is used to display a curve of torque changing with angular displacement.

[0054] The signal processing and display device 3 of the present invention receives and processes the signals of the angular displacement sensor 22 and the torque sensor 21, and displays the curve of the torque changing with the angular displacement through the display screen integrated on the controller, which can accurately identify the angular positions corresponding to the maximum and minimum points of the drag torque; by setting a plurality of indicator lights, it can assist the operator to control the rotation speed and force more accurately, thereby improving the accuracy of manual measurement.

[0055] like Figure 2 As shown, the signal processing display device 3 may be provided with a buckle, and the signal processing display device 3 may be clamped on the claw assembly 11 during use, and rotate together with the claw assembly 11 .

[0056] In a second aspect, the present invention provides a method for measuring a vehicle wheel end drag torque measurement device based on angular displacement, comprising:

[0057] like Figure 8 As shown, the length of the clamping jaw assembly of the clamping device 1 is adjusted, and the worm 16 is rotated, so that multiple clamping jaw assemblies are simultaneously contracted and clamped on the rim of the wheel, and the axis of the gear 12 passes through the center of the wheel;

[0058] Connect the rotating handle 23 to the torque sensor 21;

[0059] The handle 23 is rotated at a constant speed, and the indicator light of the signal processing display device 3 is observed. When the indicator light corresponding to the required values ​​of the angular velocity and the angular acceleration is on, the current rotation speed is maintained and the measurement is continued.

[0060] Among them, three indicator lights are set, namely green light, yellow light and red light. During the rotation process, the signal processing display device 3 will calculate and monitor the angular velocity and angular acceleration in real time. When the angular velocity is in the set interval and the angular acceleration is lower than the first threshold, the green light is on, prompting to maintain the current rotation speed and continue measuring; when the angular velocity is higher than the set interval and the angular acceleration is higher than the first threshold, or when the angular velocity is in the set interval and the angular acceleration is higher than the first threshold, the yellow light is on, prompting the need to reduce the rotation speed and rotation force; when the angular velocity is higher than the set interval and the angular acceleration is higher than the second threshold, or when the angular velocity is in the set interval and the angular acceleration is higher than the second threshold, the red light is on, prompting that the measurement is invalid and needs to be remeasured.

[0061] The signal processing and display device 3 of the present invention receives and processes the signals of the angular displacement sensor 22 and the torque sensor 21, and displays the curve of the torque changing with the angular displacement through the display screen integrated on the controller, which can accurately identify the angular positions corresponding to the maximum and minimum points of the drag torque; by setting a plurality of indicator lights, it can assist the operator to control the rotation speed and force more accurately, thereby improving the accuracy of manual measurement.

[0062] In addition, the present invention can also measure the drag torque of the brake. After the brake caliper piston is pressed back without removing the wheel, the drag torque of the hub bearing 26 unit can be measured. The drag torque of the brake can be calculated by subtracting the drag torque of the hub bearing 26 unit from the total wheel end drag torque.

[0063] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A vehicle wheel end drag torque measurement device based on angular displacement, characterized in that: The invention comprises a clamping device (1) and a measuring device (2), wherein the clamping device (1) is used for clamping on a wheel rim, and the measuring device (2) comprises a rotating handle (23), one end of which is provided with a torque sensor (21) and an angular displacement sensor (22), and a gravity member (25) is provided on the angular displacement sensor (22), and the gravity member (25) comprises a connecting ring (251) and a gravity block (252), the connecting ring (251) is sleeved on the angular displacement sensor (22) and is rotatably connected to the angular displacement sensor (22), a locking member (253) is provided on the connecting ring (251), and the locking member (253) is connected to the rotating shaft of the angular displacement sensor (22) and is used for limiting the rotation of the rotating shaft of the angular displacement sensor (22), and the gravity block (252) is fixedly arranged on the connecting ring (251).

2. The vehicle wheel end drag torque measurement device based on angular displacement according to claim 1 is characterized in that: The rotating handle (23) is plugged into the torque sensor (21).

3. The vehicle wheel end drag torque measurement device based on angular displacement according to claim 2 is characterized in that: A square column (211) is arranged at one end of the torque sensor (21), a connecting piece is arranged at one end of the rotating handle (23), a square hole is provided on one side of the connecting piece, the rotating handle (23) and the torque sensor (21) are plugged in through the square column (211) and the square hole, and the angular displacement sensor (22) is fixedly arranged on the other side of the connecting piece.

4. The vehicle wheel end drag torque measurement device based on angular displacement according to any one of claims 1 to 3, characterized in that: The clamping device (1) comprises a mounting plate (14), a gear (12) is rotatably arranged on the mounting plate (14), a plurality of claw assemblies (11) are slidably arranged on the mounting plate (14), the claw assemblies (11) comprise a rack (111), the rack (111) is meshed with the gear (12), and the gear (12) is used to drive the plurality of claw assemblies (11) to contract simultaneously, so that the clamping device (1) is fixed on the wheel rim and the axis of the gear (12) passes through the center of the wheel.

5. The vehicle wheel end drag torque measurement device based on angular displacement according to claim 4 is characterized in that: A transmission shaft (13) is rotatably arranged on the mounting plate (14), the gear (12) is arranged on the transmission shaft (13), a worm wheel (15) is arranged on the transmission shaft (13), a mounting bracket (17) is arranged on the mounting plate (14), a worm (16) is rotatably arranged on the mounting bracket (17), the worm (16) is meshed with the worm wheel (15), a hexagonal column is arranged on the top of the worm (16), and a wrench can be used to drive the worm (16) to rotate, thereby driving the gear (12) to rotate.

6. The vehicle wheel end drag torque measurement device based on angular displacement according to claim 5 is characterized in that: The mounting plate (14) comprises a bottom mounting plate (141), a middle mounting plate (143), and a top mounting plate (144); the bottom mounting plate (141) and the top mounting plate (144) are respectively fixedly arranged on both sides of the middle mounting plate (143); the transmission shaft (13) is rotatably connected to the middle mounting plate (143); the worm (16) and the worm wheel (15) are arranged between the middle mounting plate (143) and the top mounting plate (144); and the gear (12) is arranged between the middle mounting plate (143) and the bottom mounting plate (144). A plurality of connecting columns (18) are arranged between the middle mounting plate (143) and the bottom mounting plate (141), between the middle mounting plate (143) and the bottom mounting plate (141), and between the middle mounting plate (143) and the top mounting plate (144), wherein the connecting columns (18) are arranged perpendicular to the middle mounting plate (143), and the rack (111) of the claw assembly (11) is arranged between the connecting columns (18) and the gear (12), and the connecting columns (18) are used to connect the middle mounting plate (143) to the bottom mounting plate (141) and the top mounting plate (144), respectively.

7. The vehicle wheel end drag torque measurement device based on angular displacement according to claim 6 is characterized in that: A plurality of elongated holes (142) are provided on the bottom mounting plate (141), and the plurality of elongated holes (142) are arranged in one-to-one correspondence with the plurality of claw assemblies (11). Two limiting members (114) are provided on the rack (111), and rollers are provided on the limiting members (114). The two limiting members (114) are inserted into the elongated holes (142), thereby limiting the telescopic range and telescopic direction of the claw assembly (11).

8. The vehicle wheel end drag torque measurement device based on angular displacement according to claim 4 is characterized in that: The claw assembly (11) comprises a claw (113) and a connecting rod (112); a plurality of adjustment holes (115) are provided on the claw (113); the plurality of adjustment holes (115) are arranged along the length direction of the claw assembly (11); one end of the connecting rod (112) is connected to the rack (111); and the other end of the connecting rod (112) is connected to the claw (113) via the adjustment hole (115).

9. The vehicle wheel end drag torque measurement device based on angular displacement according to any one of claims 1 to 3, characterized in that: The invention comprises a signal processing display device (3), wherein the signal processing display device (3) is connected to a torque sensor (21) and an angular displacement sensor (22), wherein the signal processing display device (3) comprises a signal acquisition module, a signal processing module, a display module, and an indicator light module, wherein the indicator light module comprises a plurality of indicator lights, wherein the signal acquisition module is used to acquire a torque signal of the torque sensor (21) and an angular displacement signal of the angular displacement sensor (22), wherein the signal processing module is used to control the activation of different indicator lights according to the values ​​of angular velocity and angular acceleration, so as to indicate whether the rotation speed and rotation force of the rotating handle (23) meet the requirements, and wherein the display module is used to display a curve showing the change of torque with angular displacement.

10. A method for measuring the drag torque of an automobile wheel end based on angular displacement according to any one of claims 1 to 9, characterized in that: include: The length of the clamping jaw assembly of the clamping device (1) is adjusted, and the worm (16) is rotated, so that the plurality of clamping jaw assemblies are simultaneously contracted and clamped on the rim of the wheel, and the axis of the gear (12) passes through the center of the wheel; Connect the rotating handle (23) to the torque sensor (21); The handle (23) is rotated at a constant speed, and the indicator light of the signal processing display device (3) is observed. When the indicator light corresponding to the required values ​​of the angular velocity and the angular acceleration is on, the current rotation speed is maintained and the measurement is continued.

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