Device and method for measuring braking force and adhesive force of automotive brake

Abstract

The invention discloses a device and a method for measuring braking force and adhesive force of an automotive brake. The measuring device comprises a first measuring instrument used for measuring the braking force of a brake when automobile wheels brake on an actual driving road surface and a second measuring instrument used for measuring the conversion coefficient of the adhesion coefficient when the automobile wheels brake on the actual driving road surface, and the first measuring instrument and the second measuring instrument are of a detachable connection structure. Through mutual cooperation of the first measuring instrument and the second measuring instrument, brake braking force of front and rear wheels of an automobile and normal load, ground braking force, adhesive force and adhesion coefficient between the wheels and an actual driving road surface are measured, so that effective analysis and loss assessment of the braking performance of the automobile are realized.

Description

Technical Field

[0001] The present invention relates to a measuring device and a measuring method for braking force and adhesion of an automotive brake. Background Art

[0002] The existing measurement of braking force and adhesion of an automotive brake is generally carried out on a chassis dynamometer and applied to the assembly line of automobiles, the vehicle performance test line of an automobile inspection station, the research and teaching of automotive braking; when measuring the braking force and adhesion of an automotive brake, the wheels of the vehicle are on the rollers of the chassis dynamometer, the wheels drive the rollers of the chassis dynamometer to rotate, or the motor drives the wheels to rotate through the rollers, and after reaching a certain speed, the vehicle brakes, and the chassis dynamometer measures the braking force and adhesion of the automotive brake.

[0003] Measuring the braking force and adhesion of an automotive brake by a chassis dynamometer has the following problems: the braking force of the automotive brake measured by the chassis dynamometer is equal to the braking force of the roller on the wheel, and it cannot measure the braking force of the brake greater than that of the roller on the wheel and the corresponding maximum braking force of the brake; when it is difficult for the wheels to rotate after the vehicle collides or the wheels on both sides are not parallel, it is difficult to measure the braking force and adhesion of the brake on the chassis dynamometer; moreover, the wheel adhesion coefficient measured by the chassis dynamometer is the adhesion coefficient between the automotive wheel and the roller of the chassis dynamometer, and the roller is a curved surface, not the adhesion coefficient between the automotive wheel and the actual road surface on which it travels. The above problems will affect the analysis and damage assessment of automotive braking performance.

[0004] Although the existing measurement of the adhesion coefficient of automotive wheels can also be carried out on a flat plate brake test bench, it also cannot measure the braking force of the brake greater than that of the flat plate brake test bench on the wheel and the corresponding maximum braking force of the brake, and the adhesion coefficient measured by it is the adhesion coefficient between the automotive wheel and the simulated road surface of the flat plate, rather than the adhesion coefficient between the automotive wheel and the actual road surface on which it travels. Therefore, it is still impossible to effectively analyze and damage assess the automotive braking performance. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the specification of this application, to avoid obscuring the purpose of this part, the abstract, and the title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] The technical problem to be solved by the present invention is how to measure the adhesion coefficient between the automotive wheel and the actual road surface on which it travels, the braking force of the brake, and the maximum braking force of the brake to achieve effective analysis and damage assessment of automotive braking performance.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A measuring device for the braking force and adhesion of an automotive brake, which includes a first measuring instrument for measuring the braking force of the brake when the vehicle wheel brakes on the actual driving road surface and a second measuring instrument for measuring the conversion coefficient of the adhesion coefficient when the vehicle wheel brakes on the actual driving road surface. The first measuring instrument and the second measuring instrument are of a detachable connection structure.

[0008] As a preferred embodiment of the measuring device for the braking force and adhesion of the automotive brake of the present invention, wherein: the first measuring instrument includes a ground guide rail, a fixing plate, a first bolt, a connecting bracket, a hydraulic measuring assembly, a first slider, a U-shaped bracket, a tray, a simulated road surface, and a pressure measuring assembly. The fixing plate is arranged at one end of the ground guide rail through the first bolt, the connecting bracket is arranged at the other end of the ground guide rail, the hydraulic measuring assembly is arranged on the connecting bracket, the first slider is slidably arranged on the ground guide rail, the U-shaped bracket is arranged on the first slider, the simulated road surface is arranged on the top of the U-shaped bracket through the tray, and the pressure measuring assembly is arranged inside the U-shaped bracket. The hydraulic measuring assembly is connected to the U-shaped bracket.

[0009] As a preferred embodiment of the measuring device for the braking force and adhesion of the automotive brake of the present invention, wherein: the hydraulic measuring assembly includes a hydraulic cylinder, a bolt assembly, a thrust sensor, a horizontal guiding column, a first wire, a thrust display, and a pressurizing member. The hydraulic cylinder is arranged on the connecting bracket through the bolt assembly, the thrust sensor is arranged on the U-shaped bracket, the thrust sensor is connected to the hydraulic cylinder through the horizontal guiding column, the thrust display is connected to the thrust sensor through the first wire, and the pressurizing member is arranged on the hydraulic cylinder.

[0010] As a preferred embodiment of the measuring device for the braking force and adhesion of the automotive brake of the present invention, wherein: the pressurizing member includes an oil pipe and a manual hydraulic pump, and the manual hydraulic pump is connected to the inside of the hydraulic cylinder through the oil pipe.

[0011] As a preferred embodiment of the measuring device for the braking force and adhesion of the automotive brake of the present invention, wherein: the pressure measuring assembly includes a pressure sensor, a vertical guiding column, a second wire, and a pressure display. The pressure sensor is arranged inside the U-shaped bracket, the pressure sensor is connected to the tray through the vertical guiding column, and the pressure display is connected to the pressure sensor through the second wire.

[0012] As a preferred embodiment of the measuring device for the braking force and adhesion of the automotive brake of the present invention, wherein: the second measuring instrument includes a fixed bracket, a moving assembly, a plate shaft, a plate sleeve, and a bent plate. The fixing plate connects the fixed bracket and the ground guide rail through the first bolt, the moving assembly is arranged on the fixed bracket, the plate shaft is arranged on the moving assembly, the plate sleeve is inserted on the plate shaft, and the bent plate is arranged on the plate shaft and the plate sleeve.

[0013] As a preferred embodiment of the measuring device for the braking force and adhesion of the vehicle brake according to the present invention, wherein: the moving assembly includes a horizontal guide rail, a second slider, a vertical guide rail and a third slider. The horizontal guide rails are symmetrically arranged on both sides of the fixed bracket. The second slider is arranged on the horizontal guide rail. The vertical guide rail is arranged on the second slider. The third slider is slidably arranged on the vertical guide rail. One end of the plate shaft is arranged on the third slider on one side of the fixed bracket, and the plate sleeve is arranged on the third slider on the other side of the fixed bracket.

[0014] As a preferred embodiment of the measuring device for the braking force and adhesion of the vehicle brake according to the present invention, wherein: the material of the simulated road surface is the same as that of the actual driving road surface of the vehicle.

[0015] A method for measuring the braking force and adhesion of a vehicle brake includes the following steps:

[0016] S1: Place a first measuring instrument under each of the front and rear wheels of the vehicle, and the front and rear wheels are on the simulated road surface below them;

[0017] S2: Measure the braking force of the front and rear wheel brakes of the vehicle;

[0018] S3: Measure the normal load, adhesion and adhesion coefficient between the front and rear wheels of the vehicle and the simulated road surface;

[0019] S4: Measure the conversion coefficient of the adhesion coefficient of the front and rear wheels of the vehicle;

[0020] S5: Calculate the adhesion coefficient between the front and rear wheels of the vehicle and the actual driving road surface;

[0021] S6: Calculate the adhesion between the front and rear wheels of the vehicle and the actual driving road surface.

[0022] As a preferred embodiment of the method for measuring the braking force and adhesion of the vehicle brake according to the present invention, wherein: in step S3, the weight addition method and the weight reduction method are used to change the normal load between the front and rear wheels and the simulated road surface.

[0023] The beneficial effect of the present invention is that through the mutual cooperation between the first measuring instrument and the second measuring instrument, the braking force of the front and rear wheels of the vehicle and the normal load, ground braking force, adhesion and adhesion coefficient between the wheels and the actual driving road surface can be measured, so as to effectively analyze and determine the loss of the vehicle braking performance. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0025] Figure 1 It is a front view structural schematic diagram of a measuring device for the braking force and adhesion of an automotive brake.

[0026] Figure 2 It is a top view structural schematic diagram of a measuring device for the braking force and adhesion of an automotive brake.

[0027] Figure 3 It is a left view structural schematic diagram of a measuring device for the braking force and adhesion of an automotive brake.

[0028] Figure 4 It is a front view structural schematic diagram of the first measuring instrument.

[0029] Figure 5 It is a top view structural schematic diagram of the first measuring instrument.

[0030] Figure 6 It is a left view structural schematic diagram of the first measuring instrument.

[0031] Figure 7 It is a front view structural schematic diagram of a U-shaped bracket.

[0032] Figure 8 It is a top view structural schematic diagram of a U-shaped bracket.

[0033] Figure 9 It is a left view structural schematic diagram of a U-shaped bracket.

[0034] Figure 10 It is a front view structural schematic diagram of a U-shaped plate.

[0035] Figure 11 It is a top view structural schematic diagram of a U-shaped plate.

[0036] Figure 12 It is a front view structural schematic diagram of the second measuring instrument.

[0037] Figure 13 It is a top view structural schematic diagram of the second measuring instrument.

[0038] Figure 14 It is a left view structural schematic diagram of the second measuring instrument.

[0039] Figure 15 It is a front view structural schematic diagram of a fixed bracket.

[0040] Figure 16 Schematic left view of the fixed bracket.

[0041] Figure 17 Schematic front view of the plate shaft.

[0042] Figure 18 Schematic left view of the plate shaft.

[0043] Figure 19 Schematic front view of the bent plate.

[0044] Figure 20 Schematic diagram for measuring the braking force of the wheel brake of the wheel, as well as the ground braking force, adhesion and adhesion coefficient between the wheel and the simulated road surface.

[0045] Figure 21 Schematic front view of the measuring device for the braking force and adhesion of the vehicle brake to measure the normal load of the vehicle wheel.

[0046] Figure 22 Schematic top view of the measuring device for the braking force and adhesion of the vehicle brake to measure the normal load of the vehicle wheel.

[0047] Figure 23 Schematic diagram for starting to measure the adhesion and adhesion coefficient of the vehicle wheel on the actual driving road surface.

[0048] Figure 24 Schematic diagram for measuring the adhesion and adhesion coefficient of the vehicle wheel on the actual driving road surface.

[0049] Figure 25 Schematic diagram for preparing to measure the braking force of the front and rear vehicle wheels, as well as the normal load, adhesion and adhesion coefficient between the wheel and the simulated road surface.

[0050] Figure 26 Schematic diagram for measuring the braking force of the front and rear vehicle wheels, as well as the normal load, adhesion and adhesion coefficient between the wheel and the simulated road surface.

[0051] In the figure: 1. First measuring instrument; 2. Second measuring instrument; 3. First bolt; 4. Fixed plate; 5. Tray; 6. Simulated road surface; 7. Second bolt; 8. Thrust sensor; 9. Horizontal guiding column; 10. Hydraulic cylinder; 11. Bolt assembly; 12. Connecting bracket; 13. Ground guide rail; 14. Third bolt; 15. Positioning pin; 16. Vertical guiding column; 17. Pressure sensor; 18. Fourth bolt; 19. U-shaped bracket; 20. First slider; 21. Fifth bolt; 22. Second wire; 23. Pressure display; 24. First wire; 25. Thrust display; 26. Oil pipe; 27. Manual hydraulic pump; 28. Peripheral plate; 29. Vertical guiding hollow cylinder; 30. U-shaped plate; 31. T-shaped plate; 32. Horizontal guiding hollow cylinder; 33. Fixed bracket; 34. Sixth bolt; 35. Horizontal guide rail; 36. Seventh bolt; 37. Second slider; 38. Eighth bolt; 39. Vertical guide rail; 40. Third slider; 41. Plate shaft; 42. Fixed bolt; 43. Plate sleeve; 44. Ninth bolt; 45. Bent plate; 46. Tenth bolt; 47. Left end plate; 48. Shaft; 49. Ring plate; 50. Wheel; 51. Piston rod; 52. Road surface; 53. Hub; 54. Threaded hole; 55. Vehicle. Specific implementation mode

[0052] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation mode of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0053] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0054] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an individual or alternative embodiment that is mutually exclusive with other embodiments.

[0055] Embodiment 1

[0056] Referring to Figures 1 - 19 , this is the first embodiment of the present invention. This embodiment provides a measuring device for the braking force and adhesion of an automotive brake, which includes a first measuring instrument 1 for measuring the braking force of the brake when the vehicle wheel brakes on the actual driving road surface and a second measuring instrument 2 for measuring the conversion coefficient of the adhesion coefficient when the vehicle wheel brakes on the actual driving road surface. The first measuring instrument 1 and the second measuring instrument 2 are of a detachable connection structure.

[0057] The measuring device for the braking force and adhesion of an automotive brake mainly consists of a first measuring instrument 1 and a second measuring instrument 2. By means of the first measuring instrument 1, the measurement of the braking force of the brake when the wheel 50 of the vehicle 55 brakes on the actual driving road surface 52 can be realized. The second measuring instrument 2 is installed on the first measuring instrument 1. By means of the second measuring instrument 2, the measurement of the conversion coefficient of the adhesion coefficient when the wheel 50 of the vehicle 55 brakes on the actual driving road surface 52 can be realized. It should be noted that a detachable connection structure is adopted between the first measuring instrument 1 and the second measuring instrument 2 so that the first measuring instrument 1 can be detached from the second measuring instrument 2 for independent use. In this embodiment, through the mutual cooperation between the first measuring instrument and the second measuring instrument, the braking forces of the front and rear wheels of the vehicle, the normal load, the ground braking force, the adhesion force and the adhesion coefficient between the wheel and the actual driving road surface are measured, so as to realize the effective analysis of the braking performance of the vehicle. In addition, when it is difficult for the wheel to rotate or the wheels on both sides are not parallel after the vehicle collides, the braking force and adhesion of the brake can also be measured by this measuring device, so as to realize the effective loss assessment analysis of the vehicle in the later stage.

[0058] Specifically, the first measuring instrument 1 includes a ground guide rail 13, a fixing plate 4, a first bolt 3, a connecting bracket 12, a hydraulic measuring component, a first slider 20, a U-shaped bracket 19, a tray 5, a simulated road surface 6 and a pressure measuring component. The fixing plate 4 is arranged at one end of the ground guide rail 13 through the first bolt 3. The connecting bracket 12 is arranged at the other end of the ground guide rail 13. The hydraulic measuring component is arranged on the connecting bracket 12. The first slider 20 is slidably arranged on the ground guide rail 13. The U-shaped bracket 19 is arranged on the first slider 20. The simulated road surface 6 is arranged on the top of the U-shaped bracket 19 through the tray 5. Further, the material of the simulated road surface 6 is the same as that of the actual driving road surface 52 of the vehicle. The pressure measuring component is arranged in the U-shaped bracket 19. The hydraulic measuring component is connected to the U-shaped bracket 19.

[0059] The first measuring instrument 1 in this embodiment mainly consists of two ground guide rails 13, a fixing plate 4, a first bolt 3, a connecting bracket 12, a hydraulic measuring assembly, a first slider 20, a U-shaped bracket 19, a tray 5, a simulated road surface 6, and a pressure measuring assembly. The two ground guide rails 13 are symmetrically arranged through the fixing plate 4. Specifically, the fixing plate 4 is fixedly installed at the left end of the two ground guide rails 13 through the first bolt 3, that is, the two ground guide rails 13 are connected through the fixing plate 4. A connecting bracket 12 is fixedly installed at the right end of the two ground guide rails 13 through a third bolt 14, and the connecting bracket 12 and the ground guide rail 13 are also positioned through a positioning pin 15 to prevent the relative displacement of the position of the hydraulic measuring assembly after installation and thus unable to connect with the U-shaped bracket 19. The hydraulic measuring assembly is installed on the connecting bracket 12. A first slider 20 is slidably installed on the two ground guide rails 13. The U-shaped bracket 19 mainly consists of a U-shaped plate 30, a vertical guiding hollow cylinder 29, an outer peripheral plate 28, a T-shaped plate 31, and a horizontal guiding hollow cylinder 32. The U-shaped plate 30 is integrally in a U-shaped structure. The vertical guiding hollow cylinder 29 is vertically welded to the bottom of the U-shaped plate 30. The outer peripheral plate 28 is welded above the U-shaped plate 30. The T-shaped plate 31 is welded to the right side of the U-shaped plate 30, and the T-shaped plate 31 is connected to the outer peripheral plate 28 by welding. The horizontal guiding hollow cylinder 32 is horizontally welded to the outside of the T-shaped plate 31. The U-shaped bracket 19 is fixedly installed on the first slider 20 through a fifth bolt 21 so that the U-shaped bracket 19 can slide left and right along the ground guide rail 13. A tray 5 is installed on the top of the U-shaped bracket 19. The tray 5 is limited by the outer peripheral plate 28 to prevent relative movement. A simulated road surface 6 is installed in the tray 5. Further, the material of the simulated road surface 6 is the same as that of the actual driving road surface 52 of the vehicle to effectively analyze the braking performance of the vehicle. A pressure measuring assembly is installed in the vertical guiding hollow cylinder 29 of the U-shaped bracket 19 to measure the normal load between the wheel and the simulated road surface 6. The hydraulic measuring assembly is connected to the U-shaped bracket 19 to measure the braking force of the brake when the wheel brakes on the simulated road surface 6.

[0060] Specifically, the hydraulic measuring assembly includes a hydraulic cylinder 10, a bolt assembly 11, a thrust sensor 8, a horizontal guiding column 9, a first wire 24, a thrust display 25, and a pressing member. The hydraulic cylinder 10 is arranged on the connecting bracket 12 through the bolt assembly 11. The thrust sensor 8 is arranged on the U-shaped bracket 19. The thrust sensor 8 is connected to the hydraulic cylinder 10 through the horizontal guiding column 9. The thrust display 25 is connected to the thrust sensor 8 through the first wire 24. The pressing member is arranged on the hydraulic cylinder 10.

[0061] The hydraulic measurement assembly mainly consists of a hydraulic cylinder 10, a bolt assembly 11, a thrust sensor 8, a horizontal guide post 9, a first wire 24, a thrust display 25 and a pressurizing member. The hydraulic cylinder 10 is installed on a connecting bracket 12 through the bolt assembly 11. The thrust sensor 8 is installed in a horizontal guide hollow cylinder 32 on a U-shaped bracket 19 through a second bolt 7. The thrust sensor 8 is coaxial with the hydraulic cylinder 10, and the axis of the thrust sensor 8 is parallel to the simulated road surface 6. The horizontal guide post 9 is located inside the horizontal guide hollow cylinder 32 and is matched with the horizontal guide hollow cylinder 32. The horizontal guide post 9 is connected to the thrust sensor 8. The thrust sensor 8 is connected to the piston rod 51 of the hydraulic cylinder 10 through the horizontal guide post 9, so that the hydraulic cylinder 10 can push the U-shaped bracket 19 to move leftward through the horizontal guide post 9. The thrust sensor 8 is connected to an external thrust display 25 through the first wire 24 to directly display the magnitude of the braking force measured by the thrust sensor 8. A pressurizing member is installed on the hydraulic cylinder 10 to pressurize the hydraulic cylinder 10.

[0062] Specifically, the pressurizing member includes an oil pipe 26 and a manual hydraulic pump 27. The manual hydraulic pump 27 is connected to the inside of the hydraulic cylinder 10 through the oil pipe 26.

[0063] The pressurizing member mainly consists of an oil pipe 26 and a manual hydraulic pump 27. The hydraulic cylinder 10 is connected to an external manual hydraulic pump 27 through the oil pipe 26, so that the manual hydraulic pump 27 can pressurize the hydraulic oil in the hydraulic cylinder 10 through the oil pipe 26.

[0064] Specifically, the pressure measurement assembly includes a pressure sensor 17, a vertical guide post 16, a second wire 22 and a pressure display 23. The pressure sensor 17 is arranged inside the U-shaped bracket 19. The pressure sensor 17 is connected to a tray 5 through the vertical guide post 16. The pressure display 23 is connected to the pressure sensor 17 through the second wire 22.

[0065] The pressure measurement assembly mainly consists of a pressure sensor 17, a vertical guide post 16, a second wire 22, and a pressure display 23. The pressure sensor 17 is fixedly installed in the vertical guide hollow cylinder 29 of the U-shaped bracket 19 through a fourth bolt 18. The axis of the pressure sensor 17 is perpendicular to the simulated road surface 6. The vertical guide post 16 presses on the pressure sensor 17. The vertical guide post 16 is located within the vertical guide hollow cylinder 29 and is matched with the vertical guide hollow cylinder 29. The tray 5 presses on the upper part of the vertical guide post 16 so as to measure the normal load between the wheel 50 and the simulated road surface 6 through the pressure sensor 17. The pressure sensor 17 is connected to an external pressure display 23 through the second wire 22 so as to directly display the magnitude of the normal load measured by the pressure sensor 17. It should be noted that the pressure sensor 17 and the thrust sensor 8 can work independently without affecting each other. The pressure sensor 17 measures the normal load of the wheel 50, and the thrust sensor 8 measures the ground braking force of the wheel 50, or the simultaneous measurement of both can also be achieved.

[0066] Specifically, the second measuring instrument 2 includes a fixed bracket 33, a moving component, a plate shaft 41, a plate sleeve 43, and a bent plate 45. The fixed plate 4 connects the fixed bracket 33 and the ground guide rail 13 through a first bolt 3. The moving component is arranged on the fixed bracket 33. The plate shaft 41 is arranged on the moving component. The plate sleeve 43 is inserted on the plate shaft 41. The bent plate 45 is arranged on the plate shaft 41 and the plate sleeve 43.

[0067] The second measuring instrument 2 mainly consists of a fixed bracket 33, a moving component, a plate shaft 41, a plate sleeve 43, and a bent plate 45. The fixed bracket 33 is integrally in a cuboid structure. When it is necessary to install the first measuring instrument 1 on the second measuring instrument 2, loosen the first bolt 3. The fixed plate 4 connects the fixed bracket 33 and the ground guide rail 13 through the first bolt 3, making the fixed bracket 33 and the ground guide rail 13 an integral whole. A moving component is installed on the fixed bracket 33 to realize the movement of the wheel in the horizontal and vertical directions. A plate shaft 41 is installed on the moving component. The plate shaft 41 mainly consists of a left end plate 47, a shaft 48, and a circular ring plate 49. The shaft 48 is welded to the left end plate 47, and the circular ring plate 49 is welded to the shaft 48. A fixing bolt 42 for fixing the hub 53 of the wheel 50 is installed on the circular ring plate 49. During installation, the shaft 48 of the plate shaft 41 is inserted into the through hole on the plate sleeve 43 to install the wheel 50. Bent plates 45 are installed on one side of the plate shaft 41 and the plate sleeve 43 through a tenth bolt 46 and a ninth bolt 44 respectively. When the wheel 50 contacts the actual road surface 52 it travels on, the lower end of the bent plate 45 contacts the U-shaped bracket 19 so that the hydraulic measurement assembly measures the braking force between the wheel 50 and the actual road surface 52 it travels on. When the wheel 50 contacts the simulated road surface 6, the bent plate 45 is above the first measuring instrument 1.

[0068] Specifically, the moving component includes a horizontal guide rail 35, a second slider 37, a vertical guide rail 39, and a third slider 40. The horizontal guide rails 35 are symmetrically arranged on both sides of the fixed bracket 33. The second slider 37 is arranged on the horizontal guide rail 35. The vertical guide rail 39 is arranged on the second slider 37. The third slider 40 is slidably arranged on the vertical guide rail 39. One end of the plate shaft 41 is arranged on the third slider 40 on one side of the fixed bracket 33, and the plate sleeve 43 is arranged on the third slider 40 on the other side of the fixed bracket 33.

[0069] The moving component is mainly composed of four horizontal guide rails 35, eight second sliders 37, four vertical guide rails 39, and eight third sliders 40. The four horizontal guide rails 35 are symmetrically installed on the left and right sides of the fixed bracket 33 through the sixth bolts 34. Two second sliders 37 are slidably installed on each horizontal guide rail 35. Threaded holes 54 for restricting the sliding of the second slider 37 are provided on the horizontal guide rail 35. The seventh bolt 36 is installed on the second slider 37. By screwing the seventh bolt 36 into the corresponding threaded hole 54 on the horizontal guide rail 35, the limit of the second slider 37 is realized. Two vertical guide rails 39 are symmetrically installed on the four second sliders 37 on both sides of the fixed bracket 33 through the eighth bolts 38 respectively. Two third sliders 40 are slidably installed on each vertical guide rail 39. The left end plate 47 is fixedly installed on the third slider 40 on the left side of the fixed bracket 33 through the tenth bolt 46, and the plate sleeve 43 is fixedly installed on the third slider 40 on the right side of the fixed bracket 33 through the ninth bolt 44, so as to realize the fixed connection between the moving component and the plate shaft 41 and the plate sleeve 43 respectively, thereby realizing the movement of the wheel 50 in the horizontal and vertical directions.

[0070] Embodiment 2

[0071] Refer to Figures 20 - 22 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment. This embodiment provides a method for measuring the braking force of the brake of an automobile wheel, as well as the normal load, ground braking force, adhesion force, and adhesion coefficient between the wheel and the simulated road surface.

[0072] The specific steps are as follows:

[0073] S1: Measure the normal load between the wheel and the simulated road surface;

[0074] The normal load F Z between the wheel 50 and the simulated road surface 6 is measured as Figure 20As shown in the figure, the vehicle brake braking force and adhesion measuring instrument is placed horizontally. The wheel 50 is on the simulated road surface 6. The wheel 50 presses on the pressure sensor 17 through the simulated road surface 6, the tray 5, and the vertical guiding solid cylinder 16. The pressure sensor 17 is supported on the ground guide rail 13 through the U-shaped bracket 19 and the first slider 20. The pressure display 23 displays the normal load F of the wheel 50 Z , that is, the normal load F of the wheel 50 is measured Z . It should be noted that when the pressure display 23 displays the normal load F of the wheel 50 Z , the weight of non-wheel 50 below the wheel 50 and above the pressure sensor 17 should be deducted; through the setting in the pressure display 23, the weight of non-wheel 50 below the wheel 50 and above the pressure sensor 17 can be deducted. Therefore, in the subsequent measurement, it is considered that the force displayed by the pressure display 23 is the normal load F of the wheel 50 Z .

[0075] S2: Measure the brake braking force of the wheel, the ground braking force, adhesion and adhesion coefficient between the wheel and the simulated road surface

[0076] The measurement of the brake braking force of the wheel 50, the ground braking force, adhesion and adhesion coefficient between the wheel 50 and the simulated road surface 6 is as Figure 21 shown. After the brake in the wheel 50 is braked, the manual hydraulic pump 27 pressurizes the hydraulic oil in the hydraulic cylinder 10 through the oil pipe 26, pushing the piston rod 51 of the hydraulic cylinder 10 to move leftward. The piston rod 51 pushes the horizontal guiding column 9, and the horizontal guiding column 9 drives the U-shaped bracket 19 to push the tray 5 to move leftward

[0077] The thrust display 25 displays the ground braking force F of the simulated road surface 6 on the wheel 50 Xbt , and at the same time, the pressure display 23 displays the normal load F of the wheel 50 Z . The ground braking force F Xbt is equal to the brake braking force F μ , that is, the brake braking force F of the wheel 50 is measured μ , the ground braking force F Xbt and the normal load F Z ; in the thrust display 25 showing the ground braking force F Xbt , the friction between the first slider 20 and the ground guide rail 13 should be deducted; through the setting in the thrust display 25, the friction between the first slider 20 and the ground guide rail 13 can be deducted. Therefore, in the subsequent measurement, it is considered that the force displayed by the thrust display 25 is the ground braking force F Xbt .

[0078] The simulated road surface 6 undergoes relative sliding with respect to the wheel 50, and the thrust display 25 displays the ground braking force F of the simulated road surface 6 on the wheel 50 Xbt which is equal to the adhesion force and is also equal to the braking force of the brake when the ground braking force is equal to the adhesion force The pressure display 23 simultaneously displays the normal load of the wheel 50 Dividing the adhesion force by the normal load of the wheel yields the adhesion coefficient between the wheel 50 and the simulated road surface 6 That is, the braking force of the brake is measured the adhesion force the normal load and the adhesion coefficient

[0079]

[0080] In the formula, is the adhesion coefficient between the wheel 50 and the simulated road surface 6; is the adhesion force between the wheel 50 and the simulated road surface 6; is the normal load of the wheel 50 when subjected to the adhesion force, corresponding to and is the braking force of the brake of the wheel 50 when subjected to the adhesion force.

[0081] By changing the weight of the wheel 50 and with the wheel 50 rotating, different braking forces F of the brake can be obtained μ and the corresponding normal load F of the wheel Z ; when the weight of the wheel 50 is increased to a certain value, due to the influence of its frictional torque, the brake no longer increases, and the braking force of the brake no longer increases. At this time, the maximum braking force F of the brake is obtained μmax and the corresponding normal load F of the wheel Zmax .

[0082] Example 3

[0083] Referring to Figures 20 - 24 , this is the third embodiment of the present invention. Based on the first two embodiments, this embodiment provides a method for measuring the conversion coefficient of the adhesion coefficient of an automobile wheel, as well as the adhesion force and adhesion coefficient between the wheel and the road surface,

[0084] The specific steps are as follows:

[0085] S1: Measure the normal load of the automobile wheel;

[0086] Measure the normal load F of the automobile wheel 50 on the measuring device for the braking force and adhesion force of the automobile brake Z, the measuring device for the braking force and adhesion of the vehicle brake is placed horizontally. The fixing bolt 42 fixes the hub 53 of the wheel 50 on the circular plate 49 of the plate shaft 41. The wheel 50 comes from the vehicle for converting the coefficient of wheel adhesion and calculating the adhesion force; after the installation of the wheel 50 is completed, under the action of gravity, the third slider 40 slides downward along the vertical guide rail 39. The third slider 40, the plate shaft 41, the fixing bolt 42, the plate sleeve 43, the ninth bolt 44, the bent plate 45, the tenth bolt 46 and the wheel 50 are pressed together on the simulated road surface 6. The wheel 50 is on the simulated road surface 6, so that the wheel 50 is subjected to a normal load F Z , the pressure sensor 17 displays the normal load F received by the wheel 50 through the pressure display 23 Z , that is, the normal load F received by the wheel 50 is measured Z ; when the pressure display 23 shows the normal load F received by the wheel 50 Z , the weight of the non-wheel 50 normal load below the wheel 50 and above the pressure sensor 17 should be deducted;

[0087] S2: Measure the adhesion and adhesion coefficient between the vehicle wheel and the simulated road surface;

[0088] The measurement of the adhesion and adhesion coefficient between the vehicle wheel 50 and the simulated road surface 6 is as Figure 21 shown. The manual hydraulic pump 27 pressurizes the hydraulic oil in the hydraulic cylinder 10 through the oil pipe 26, pushing the piston rod 51 of the hydraulic cylinder 10 to move leftward. The piston rod 51 drives the horizontal guide post 9 through the horizontal guide post 9, and the horizontal guide post 9 drives the bracket 19 in the shape of a "ji" to push the simulated road surface 6 to move leftward. Since the hub 53 of the wheel 50 is fixed on the circular plate 49 of the plate shaft 41 by the fixing bolt 42, the wheel 50 does not rotate and the wheel is in a static state. The tire of the wheel 50 generates circumferential deformation, and a ground braking force F is generated between the wheel 50 and the simulated road surface 6 Xbt , the thrust sensor 8 displays the ground braking force F exerted by the wheel 50 on the simulated road surface 6 through the thrust display 25 Xbt , the ground braking force exerted by the wheel 50 on the simulated road surface 6 is equal to the ground braking force exerted by the simulated road surface 6 on the wheel 50, that is, the ground braking force F between the vehicle wheel 50 and the simulated road surface 6 is measured Xbt ;

[0089] When the wheel 50 slides relative to the simulated road surface 6, the thrust display 25 shows the ground braking force F of the simulated road surface 6 on the wheel 50 Xbt is equal to the adhesion force The pressure display 23 simultaneously displays the normal load of the wheel 50 According to formula (1), divide the adhesion force by the normal load of the wheel 50 Obtain the adhesion coefficient between the wheel 50 and the simulated road surface 6 That is, measure the adhesion force between the wheel 50 and the simulated road surface 6 Normal load and adhesion coefficient

[0090] S3: Measure the adhesion force and adhesion coefficient between the vehicle wheel and the road surface;

[0091] Start measuring the adhesion force and adhesion coefficient of the vehicle wheel 50 on the actual driving road surface 52 of the wheel as Figure 23 shown. Remove the seventh bolt 36, and move the second slider 37 to the left along the horizontal guide rail 35. At this time, the threaded hole 54 connected to the seventh bolt 36 on the horizontal guide rail 35 can be seen. The wheel 50 has two degrees of freedom of sliding along the horizontal guide rail 35 with the second slider 37 and sliding along the vertical guide rail 39 with the third slider 40; under the action of gravity, the third slider 40 slides downward along the vertical guide rail 39. The third slider 40, plate shaft 41, fixing bolt 42, plate sleeve 43, ninth bolt 44, bent plate 45, tenth bolt 46 and the wheel 50 are pressed on the road surface 52 together. The wheel 50 is on the road surface 52, so that the wheel 50 is subjected to a normal load Since the objects pressing on the simulated road surface 6 and the road surface 52 together with the wheel 50 are the same, therefore, the bent plate 45 leans against the U-shaped bracket 19.

[0092] Measure the adhesion force and adhesion coefficient of the vehicle wheel 50 on the road surface as Figure 24 shown. The manual hydraulic pump 27 pressurizes the hydraulic oil in the hydraulic cylinder 10 through the oil pipe 26, pushing the piston rod 51 of the hydraulic cylinder 10 to move to the left. The piston rod 51 pushes the U-shaped bracket 19 to move to the left through the thrust sensor 8. The U-shaped bracket 19 pushes the wheel 50 to move to the left through the bent plate 45, ninth plate bolt 44, plate sleeve 43, tenth bolt 46, plate shaft 41, fixing bolt 42. The plate sleeve 43 and the plate shaft 41 respectively push the second slider 37 to slide to the left along the horizontal guide rail 35 through the ninth bolt 44, tenth bolt 46, third slider 40, vertical guide rail 39, eighth bolt 38. Since the hub 53 of the wheel 50 is fixed on the circular plate 49 of the plate shaft 41 through the fixing bolt 42, and the tenth bolt 46 fixes the left end plate 47 of the plate shaft 41 on the third slider 40, the wheel 50 does not rotate, the tire of the wheel 50 generates circumferential deformation, and a ground braking force F is generated between the wheel 50 and the road surface 52 Xbtd , and the thrust display 25 displays the ground braking force F exerted by the wheel 50 on the road surface 52 Xbtd , the ground braking force exerted by the wheel 50 on the road surface 52 is equal to the ground braking force exerted by the road surface 52 on the wheel 50, that is, measure the ground braking force F between the vehicle wheel 50 and the road surface 52 Xbtd; Display the ground braking force F on the thrust display 25 Xbtd In this case, the frictional forces between the second slider 37 and the horizontal guide rail 35, and between the first slider 20 and the ground guide rail 13 should be deducted.

[0093] When the wheel 50 slides relative to the road surface 52, the thrust display 25 displays the ground braking force F of the road surface 52 on the wheel 50 Xbtd which is equal to the adhesion force Divide the adhesion force by the normal load of the wheel to obtain the adhesion coefficient between the wheel 50 and the road surface 52 That is, the adhesion force between the wheel 50 and the road surface 52 is measured Normal load and adhesion coefficient

[0094]

[0095] In the formula, is the adhesion coefficient between the wheel 50 and the road surface 52; is the adhesion force between the wheel 50 and the road surface 52; is the normal load when the wheel 50 is subject to the adhesion force and corresponds to with corresponding.

[0096] When the road surface 52 on which the wheel 50 actually travels is a concave or convex curved surface, since the third slider 40 is not fixed to the vertical guide rail 39, the third slider 40 can slide up and down relative to the vertical guide rail 39, enabling the wheel 50 to move up and down along with the concave or convex road surface 52 and pressing tightly against the road surface 52, and also enabling the second measuring instrument to measure the adhesion force and adhesion coefficient between the vehicle wheel 50 and the concave and convex road surface 52 on which it travels.

[0097] S4: Calculate the conversion coefficient of the vehicle wheel adhesion coefficient;

[0098] The conversion coefficient K of the vehicle wheel adhesion coefficient is equal to the adhesion coefficient between the wheel 50 and the road surface 52 divided by the adhesion coefficient between the wheel 50 and the simulated road surface 6 That is

[0099]

[0100] According to And then from Equation (1) and Equation (2), we get

[0101]

[0102] Considering Equation (3), the adhesion force between the wheel 50 and the road surface 52 can be further obtained.

[0103]

[0104] Wherein, is the adhesion force between the wheel 50 and the road surface 52, K is the conversion coefficient of the adhesion coefficient of the vehicle wheel, is the adhesion force between the wheel 50 and the simulated road surface 6.

[0105] With the conversion coefficient K of the adhesion coefficient of the vehicle wheel, according to Equation (4), the adhesion force between the wheel 50 and the road surface 52 is equal to the conversion coefficient K of the adhesion coefficient of the vehicle wheel multiplied by the adhesion force between the wheel 50 and the simulated road surface 6 In this way, the adhesion force between the wheel 50 and the simulated road surface 6 can be converted into the adhesion force between the wheel 50 and the road surface 52 Thus, the adhesion force between the wheel 50 and the road surface 52 can be obtained

[0106] Embodiment 4

[0107] Referring to Figures 20 - 26 , this is the fourth embodiment of the present invention. This embodiment is based on the first three embodiments. This embodiment provides a method for measuring the braking force and adhesion force of an automotive brake, including the following steps:

[0108] S1: The vehicle 55 is placed horizontally. A first measuring instrument is placed under each wheel 50 of the front and rear wheels of the vehicle 55. The front and rear wheels are on the simulated road surface 6 below them. The wheel 50 presses on the pressure sensor 17 through the simulated road surface 6, the tray 5, and the vertical guide post 16. The pressure sensor 17 is supported on the ground guide rail 13 through the U-shaped bracket 19 and the first slider 20. The pressure display 23 shows the normal loads F Z10 , F Z20 .

[0109] S2: Measure the braking forces of the brakes of the front and rear wheels of the vehicle. There are brakes in the front and rear wheels of the vehicle. During the measurement, step on the brake pedal to fully brake the brakes in the front and rear wheels. The manual hydraulic pump 27 pressurizes the hydraulic oil in the hydraulic cylinder 10 through the oil pipe 26, pushing the piston rod 51 of the hydraulic cylinder 10 to move leftward. The piston rod 51 drives the U-shaped bracket 19 through the thrust sensor 8, and the U-shaped bracket 19 pushes the simulated road surface 6 to move leftward. At this time, the value displayed by the thrust display 25 is the braking force of the front and rear wheels of the vehicle on the simulated road surface 6.

[0110] S3: Change the normal load of the front wheels, simulate the relative sliding of the road surface 6 relative to the front wheels, and the thrust display 25 of the first measuring instrument 1 under the front wheels shows the ground braking force F of the simulated road surface 6 on the front wheels Xb1t , F Xb1t equals the adhesion of the front wheels also equals the brake braking force when the front wheels are subject to adhesion that is, the adhesion of the front wheels is measured and the brake braking force The pressure display 23 simultaneously shows the normal load of the front wheels Then use the adhesion of the front wheels divide by the normal load of the front wheels to obtain the adhesion coefficient between the front wheels and the simulated road surface 6 that is, the adhesion coefficient between the front wheels and the simulated road surface 6 is measured

[0111]

[0112] Similarly, change the normal load of the rear wheels, simulate the relative sliding of the road surface 6 relative to the rear wheels, and the thrust display 25 of the first measuring instrument 1 under the rear wheels shows the ground braking force F of the simulated road surface 6 on the rear wheels Xb2t , F Xb2t equals the adhesion of the rear wheels also equals the brake braking force when the rear wheels are subject to adhesion that is, the adhesion of the rear wheels is measured and the brake braking force The pressure display 23 simultaneously shows the normal load of the rear wheels Then use the adhesion of the rear wheels divide by the normal load of the rear wheels to obtain the adhesion coefficient between the rear wheels and the simulated road surface 6 that is, the adhesion coefficient between the rear wheels and the simulated road surface 6 is measured

[0113]

[0114] When the adhesion coefficients between the front and rear wheels and the simulated road surface 6 are the same, it is only necessary to measure the adhesion coefficient between the front or rear wheels and the simulated road surface 6 for either the front or rear wheels

[0115] In this embodiment, the weight addition method and the weight reduction method are used to change the normal loads of the front and rear wheels. Weights can be directly added to the front and rear wheels, or weights can be added in the cab or other places where the front and rear wheels can be made heavier; the frames above the front and rear wheels can be supported by height-adjustable jacks respectively to reduce the normal loads of the front and rear wheels

[0116] A piezoelectric ceramic pressure sensor can also be installed on the brake pedal. When braking, the foot steps on the piezoelectric ceramic pressure sensor, which presses on the brake pedal, and the pedal force during braking is measured to understand the relationship between the pedal force, the braking force of the brake, and the adhesion force.

[0117] Change the weight of the front wheels. After the weight of the front wheels increases to a certain value, the front-wheel brake is affected by its frictional torque and the braking force no longer increases. At this time, the maximum braking force F of the front wheels can be measured. μ1max and the corresponding adhesion force of the front wheels and the normal load

[0118] Change the weight of the rear wheels. After increasing the weight of the rear wheels to a certain value, measure the maximum braking force F of the rear wheels. μ2max and the corresponding adhesion force of the rear wheels and the normal load

[0119] S4: Remove the front and rear wheels of the vehicle, install the first measuring instrument on the second measuring instrument 2, and measure the conversion coefficients of the adhesion coefficients of the front and rear wheels of the vehicle on the road surface 52 where the vehicle is traveling through the measuring method of Embodiment 3, and obtain the conversion coefficients K1 and K2 of the adhesion coefficients of the front and rear wheels respectively.

[0120] The adhesion coefficient between the front wheels and the road surface 52 where the vehicle is traveling

[0121]

[0122] In the formula, is the adhesion coefficient between the front wheels and the road surface 52 where the vehicle is traveling, K1 is the conversion coefficient of the adhesion coefficient of the front wheels, is the adhesion coefficient between the front wheels and the simulated road surface 6.

[0123] The adhesion coefficient between the rear wheels and the road surface 52 where the vehicle is traveling

[0124]

[0125] In the formula, is the adhesion coefficient between the rear wheels and the road surface 52 where the vehicle is traveling, K2 is the conversion coefficient of the adhesion coefficient of the rear wheels, is the adhesion coefficient between the rear wheels and the simulated road surface 6.

[0126] From Equation (7) and Equation (8), the adhesion coefficients between the front and rear wheels and the road surface 52 where the vehicle is actually traveling can be calculated respectively. and The adhesion coefficient between the front wheel and the road surface 52 on which the vehicle travels is equal to the conversion coefficient of the adhesion coefficient of the front wheel multiplied by the adhesion coefficient between the front wheel and the simulated road surface 6. The adhesion coefficient between the rear wheel and the road surface 52 on which the vehicle travels is equal to the conversion coefficient of the adhesion coefficient of the rear wheel multiplied by the adhesion coefficient between the rear wheel and the simulated road surface 6.

[0127] S6: The adhesion force between the front wheel and the road surface 52 on which the vehicle travels

[0128]

[0129] In the formula, is the adhesion force between the front wheel and the road surface 52 on which the vehicle travels, K1 is the conversion coefficient of the adhesion coefficient of the front wheel, is the adhesion force between the front wheel and the simulated road surface 6.

[0130] The adhesion force between the rear wheel and the road surface 52 on which the vehicle travels

[0131]

[0132] In the formula, is the adhesion force between the rear wheel and the road surface 52 on which the vehicle travels, K2 is the conversion coefficient of the adhesion coefficient of the rear wheel, is the adhesion force between the rear wheel and the simulated road surface 6.

[0133] From formula (9) and formula (10), the adhesion forces between the front and rear wheels and the road surface 52 on which the vehicle travels can be calculated respectively and The adhesion force between the front wheel and the road surface 52 on which the vehicle travels is equal to the conversion coefficient of the adhesion coefficient of the front wheel multiplied by the adhesion force between the front wheel and the simulated road surface 6. The adhesion force between the rear wheel and the road surface 52 on which the vehicle travels is equal to the conversion coefficient of the adhesion coefficient of the rear wheel multiplied by the adhesion force between the rear wheel and the simulated road surface 6, thereby realizing the effective analysis and damage assessment of the vehicle braking performance.

[0134] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A measuring device for braking force and adhesion of an automotive brake, characterized in that: It includes a first measuring instrument (1) for measuring the braking force of the brake when the vehicle wheel brakes on the actual driving road surface and a second measuring instrument (2) for measuring the conversion coefficient of the adhesion coefficient when the vehicle wheel brakes on the actual driving road surface. The first measuring instrument (1) and the second measuring instrument (2) are of a detachable connection structure.

2. The measuring device for braking force and adhesion of an automotive brake according to claim 1, characterized in that: The first measuring instrument (1) includes a ground guide rail (13), a fixing plate (4), a first bolt (3), a connecting bracket (12), a hydraulic measuring assembly, a first slider (20), a U-shaped bracket (19), a tray (5), a simulated road surface (6) and a pressure measuring assembly. The fixing plate (4) is arranged at one end of the ground guide rail (13) through the first bolt (3). The connecting bracket (12) is arranged at the other end of the ground guide rail (13). The hydraulic measuring assembly is arranged on the connecting bracket (12). The first slider (20) is slidably arranged on the ground guide rail (13). The U-shaped bracket (19) is arranged on the first slider (20). The simulated road surface (6) is arranged on the top of the U-shaped bracket (19) through the tray (5). The pressure measuring assembly is arranged inside the U-shaped bracket (19). The hydraulic measuring assembly is connected to the U-shaped bracket (19).

3. The measuring device for braking force and adhesion of an automotive brake according to claim 2, characterized in that: The hydraulic measuring assembly includes a hydraulic cylinder (10), a bolt assembly (11), a thrust sensor (8), a horizontal guide post (9), a first wire (24), a thrust display (25) and a pressurizing member. The hydraulic cylinder (10) is arranged on the connecting bracket (12) through the bolt assembly (11). The thrust sensor (8) is arranged on the U-shaped bracket (19). The thrust sensor (8) is connected to the hydraulic cylinder (10) through the horizontal guide post (9). The thrust display (25) is connected to the thrust sensor (8) through the first wire (24). The pressurizing member is arranged on the hydraulic cylinder (10).

4. The measuring device for braking force and adhesion of an automotive brake according to claim 3, characterized in that: The pressurizing member includes an oil pipe (26) and a manual hydraulic pump (27). The manual hydraulic pump (27) is communicated with the inside of the hydraulic cylinder (10) through the oil pipe (26).

5. The measuring device for braking force and adhesion of an automotive brake according to claim 2, characterized in that: The pressure measuring assembly includes a pressure sensor (17), a vertical guide post (16), a second wire (22) and a pressure display (23). The pressure sensor (17) is arranged inside the U-shaped bracket (19). The pressure sensor (17) is connected to the tray (5) through the vertical guide post (16). The pressure display (23) is connected to the pressure sensor (17) through the second wire (22).

6. The measuring device for braking force and adhesion of an automotive brake according to claim 2, characterized in that: The second measuring instrument (2) includes a fixed bracket (33), a moving assembly, a plate shaft (41), a plate sleeve (43) and a bent plate (45). The fixing plate (4) connects the fixed bracket (33) and the ground guide rail (13) through the first bolt (3). The moving assembly is arranged on the fixed bracket (33). The plate shaft (41) is arranged on the moving assembly. The plate sleeve (43) is inserted on the plate shaft (41). The bent plate (45) is arranged on the plate shaft (41) and the plate sleeve (43).

7. The measuring device for braking force and adhesion of an automotive brake according to claim 6, characterized in that: The moving component includes a horizontal guide rail (35), a second slider (37), a vertical guide rail (39) and a third slider (40). The horizontal guide rails (35) are symmetrically arranged on both sides of the fixed bracket (33). The second slider (37) is arranged on the horizontal guide rail (35). The vertical guide rail (39) is arranged on the second slider (37). The third slider (40) is slidably arranged on the vertical guide rail (39). One end of the plate shaft (41) is arranged on the third slider (40) on one side of the fixed bracket (33), and the plate sleeve (43) is arranged on the third slider (40) on the other side of the fixed bracket (33).

8. The measuring device for braking force and adhesion of an automotive brake according to claim 2, characterized in that: The material of the simulated road surface (6) is the same as that of the actual driving road surface of the vehicle.

9. A method for measuring the braking force and adhesion of an automotive brake, characterized in that: It includes the following steps: S1: Place a first measuring instrument under each of the front and rear wheels of the vehicle, and the front and rear wheels are on the simulated road surface below them; S2: Measure the braking force of the front and rear wheel brakes of the vehicle; S3: Measure the normal load, adhesion force and adhesion coefficient between the front and rear wheels of the vehicle and the simulated road surface; S4: Measure the conversion coefficient of the adhesion coefficient of the front and rear wheels of the vehicle; S5: Calculate the adhesion coefficient between the front and rear wheels of the vehicle and the actual driving road surface; S6: Calculate the adhesion force between the front and rear wheels of the vehicle and the actual driving road surface.

10. The method for measuring the braking force and adhesion of an automotive brake according to claim 9, characterized in that: In step S3, the weight addition method and the weight reduction method are used to change the normal load between the front and rear wheels and the simulated road surface.

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