An indoor tire braking performance testing device

Abstract

An indoor tire braking performance speed measurement device, relating to the field of tire braking performance evaluation and testing, comprises a test bench, a tire clamping mechanism, a tire loading mechanism, a tire braking mechanism, a road surface simulation drive mechanism, and a speed measurement mechanism. The tire clamping mechanism includes an adjustment support plate, a connecting plate, a ball screw, a braking force sensor, and a U-shaped clamping frame; the tire loading mechanism includes a loading guide rail, a loading beam, and a loading guide pulley assembly; the tire braking mechanism includes a hand brake and a brake drag device; the road surface simulation drive mechanism includes a road surface rotating shaft, a road surface simulation wheel, and a drive motor; and the speed measurement mechanism includes an encoder. This device has the advantages of a simple structure and high data accuracy, and can meet the braking performance testing requirements of automobile tires at different speeds, loads, and in wet and slippery conditions.

Description

Technical Field

[0001] The invention relates to the field of tire braking performance evaluation and detection, and in particular to an indoor tire braking performance testing device. Background Art

[0002] As the only contact part between a car and the road, the braking performance of the tire plays a crucial role in vehicle safety. Therefore, testing the braking performance of automobile tires is essential. Automobile tire braking performance testing equipment is a key means of measuring tire braking performance. Its evaluation of automobile safety performance has important theoretical and practical significance, providing a basis for the development of high-performance safety tires.

[0003] In recent years, with the implementation of European standards, stricter entry requirements for tire wet braking performance have been imposed. To accommodate diverse vehicles and road conditions, a large number of different types and models of tires have emerged both domestically and internationally. Furthermore, as a major tire exporter, my country's tire exports have continued to increase in recent years. In 2017, the value of my country's tire exports increased by 17.39%, with an export rate (value) of 38.25%, up 2.56 percentage points, and a 9.39% increase in export volume. In the first half of 2018, the value of my country's tire exports increased by 1.92%, with an export rate (value) of 36.71%, up 0.32 percentage points, and a 2.19% increase in export volume. Bench testing of tire braking performance is essential for ensuring tire quality, export volume, and vehicle safety.

[0004] Traditionally, tire braking performance is measured outdoors on a test track using a real vehicle. However, these testing sites are extremely rare in my country, and testing is expensive. Therefore, there is an urgent need to develop an indoor tire braking performance test device to enable relevant performance evaluation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an indoor tire braking performance speed measuring device with a simple structure and high data accuracy.

[0006] The technical solution of the present invention is:

[0007] An indoor tire braking performance speed measuring device comprises a test bench, a tire clamping mechanism, a tire loading mechanism, a tire braking mechanism, a road surface simulation driving mechanism and a speed measuring mechanism; the test bench comprises an upper platform; and is characterized in that:

[0008] The structure of the tire clamping mechanism is as follows: an adjusting support plate is provided on the side surface of the upper table, and a connecting plate that can slide freely up and down is provided on the front side of the adjusting support plate, a ball screw is installed on the adjusting support plate, and a nut of the ball screw is fixedly connected to the connecting plate, and the front side of the connecting plate is connected to the U-shaped clamping frame via a braking force sensor, and tire connecting seats are provided on the inner sides of the two end portions of the U-shaped clamping frame, and loading connecting seats are respectively provided on the outer sides of the two end portions of the U-shaped clamping frame; a test slot that passes through the upper and lower parts is provided on the upper table below the U-shaped clamping frame, and support guide rails are respectively provided on both sides of the test slot, and a support slider that can slide freely back and forth is provided on the support guide rail, and the upper sides of the two support sliders are respectively connected to the lower sides of the two end portions of the U-shaped clamping frame via a shock-absorbing and buffering device;

[0009] The structure of the tire loading mechanism is as follows: two loading guide rails are vertically provided on the front side of the test bench, and a loading slide block that can slide freely up and down is provided on the loading guide rails, and a loading crossbeam is provided on the two loading slide blocks, and a loading connecting portion is provided on the loading crossbeam; an upper guide pulley is provided on the upper side of the test bench below the loading connecting seat, and a front guide pulley is provided at the upper part of the front side of the test bench opposite to the upper guide pulley, and a loading rope is connected to the loading connecting seat, and the loading rope is connected to the loading connecting portion after being guided by the upper guide pulley and the front guide pulley; a loading force sensor is provided below the loading crossbeam, and a loading cylinder is provided below the loading force sensor, and the piston rod of the loading cylinder is connected to the loading force sensor via a ball joint;

[0010] The structure of the tire brake mechanism is as follows: a hand brake is installed on the side of the wheel hub on which the tire to be tested is installed, the brake handle of the hand brake is arranged on one side of the adjustment support plate, the adjustment support plate is provided with a brake drag device, and the brake drag device is connected to the brake handle;

[0011] The structure of the road surface simulation drive mechanism is as follows: a bearing mounting seat is provided on the lower side of the upper platform, a road surface rotating shaft is mounted on the bearing mounting seat via a bearing, a road surface simulation wheel is mounted on the road surface rotating shaft and protrudes from the upper side of the upper platform through a test notch, a driven wheel is provided on the road surface rotating shaft, a drive motor is provided on the test bench, a driving wheel is provided on the output shaft of the drive motor, and a transmission belt is provided between the driving wheel and the driven wheel;

[0012] The speed measuring mechanism is structured as follows: an encoder is provided, a speed measuring driven wheel is mounted on the encoder, a speed measuring driving wheel is mounted on the test shaft, the speed measuring driven wheel and the speed measuring driving wheel are connected via a transmission belt, and the encoder is fixedly mounted on a U-shaped clamping frame.

[0013] The adjustable support plate of the present invention has upper and lower mounting beams disposed horizontally on the upper and lower sides of its front side, respectively. Left and right guide posts are vertically disposed on the left and right sides of the upper and lower mounting beams, respectively. Each of the left and right guide posts is provided with a slider that can slide freely up and down. The connecting plate is fixedly mounted on the sliders. The ball screw's screw is rotatably mounted on the upper and lower mounting beams, and a rotating handle is provided at the upper end of the ball screw's screw above the upper mounting beam. By turning the handle, the ball screw's screw rotates, driving the connecting plate up and down, thereby meeting the requirements for testing tires of different diameters.

[0014] The shock absorbing and buffering device described in the present invention is an air cylinder or an oil cylinder. The shock absorbing and buffering device can also be a shock absorbing spring. The shock absorbing and buffering device plays a role of shock absorbing and buffering when braking, simulating the force conditions of the actual tire braking process, and the data is more accurate.

[0015] The test bench described in this invention includes a front side panel, to which the loading rail is fixedly mounted. The loading connection portion comprises a force-equalizing pulley, located on the front side of the loading beam and opposite the front guide pulley. A single loading rope is provided, with its central portion positioned below the two force-equalizing pulleys. The rope's ends are guided by the front and upper guide pulleys, respectively, before connecting to the loading connection base. During operation, the loading connection bases at both ends of the U-shaped clamping frame experience the same loading force, which better reflects actual operating conditions and enhances the accuracy of test data.

[0016] The brake-pulling device described in the present invention comprises a brake base below the brake handle, a control cylinder mounted on the brake base, and two guide bars mounted on the brake base on either side of the control cylinder. A load-bearing plate is mounted on each of the two guide bars, and the output shaft of the control cylinder is located below the load-bearing plate, enabling the plate to be lifted and detached from the plate. A weight mounting rod is located above the load-bearing plate between the two guide bars, and the upper end of the weight mounting rod is hingedly connected to the brake handle via a connecting rod. Braking force can be adjusted by placing different weights on the load-bearing plate. When braking is required, the control cylinder exhausts air pressure, disengaging the output shaft from the load-bearing plate. The load-bearing plate falls under the weight of the weights, driving the weight mounting rod to pull the brake handle, automatically braking. When braking is not required, air is introduced into the control cylinder, causing the output shaft to push the load-bearing plate upward, resetting the brake handle and stopping the brake. By placing different weights on the load-bearing plate, braking force can be accurately controlled, making operation simple and convenient.

[0017] The handbrake described in this invention is a manual disc brake system comprising a handbrake caliper, a brake disc, and a brake handle. The brake disc is connected to the wheel hub or test shaft where the tire is mounted. The handbrake caliper and brake disc are mounted on a U-shaped clamping frame. The handbrake caliper and brake handle are connected by a brake cable. When the brake handle is pulled by the brake cable, the brake cable pulls the handbrake caliper to clamp the brake disc, generating braking force and completing the braking operation.

[0018] When the present invention is working, the wheel with the tire to be tested is installed on the tire connecting seat via the test shaft, and the lower part of the tire contacts the road simulation wheel; the height of the connecting plate is adjusted by rotating the ball screw to make the U-shaped clamping frame horizontal; the loading cylinder works to drive the loading beam to move downward, drive the loading rope to pull the loading connecting seat downward, increase the pressure between the tire and the road simulation wheel, and realize loading; the drive motor works to drive the road simulation wheel to rotate, and the road simulation wheel drives the wheel to rotate; the encoder detects the rotation speed of the wheel, and when the wheel rotation speed reaches the set value, the brake drag device works to drive the manual brake to work to brake the wheel; the braking force sensor detects the braking force applied to the wheel during the wheel braking process. The present invention can more accurately measure the braking force of the tire during braking; in the process of the simulated wheel rotating on the road surface and driving the simulated road surface to roll, the shock-absorbing and buffering device can play a good role in reducing vibration and maintaining the vertical load, and the supporting slider can slide freely back and forth on the supporting guide rail, so the measurement data is more accurate; the tire loading adopts a cylinder to apply it to the tire through a pulley group connected by a steel wire rope. Compared with the displacement method, the load is constant, and this structure can ensure the effective loading of the tire load; the braking structure adopts weights to achieve constant braking force loading through the brake structure, which can effectively realize braking force loading under different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 for Figure 1 Right view of .

[0021] Figure 3 for Figure 1 Top view of .

[0022] Figure 4 This is the actual braking friction force curve. DETAILED DESCRIPTION

[0023] like Figure 1-Figure 3The indoor tire braking performance speed measuring device shown includes a test bench, a tire clamping mechanism, a tire loading mechanism, a tire braking mechanism, a road simulation drive mechanism and a speed measuring mechanism; the test bench includes an upper platform 38, a lower platform 37 and a front side plate 24; the structure of the tire clamping mechanism is: an adjustment support plate 5 is provided on the rear part of the upper side of the upper platform 38, and a connecting plate 10 that can slide freely up and down is provided on the front side of the adjustment support plate 5. A ball screw is installed on the adjustment support plate 5, and the nut of the ball screw is fixedly connected to the connecting plate 10. The front side of the connecting plate 10 is connected to a U-shaped clamping frame 13 via a braking force sensor 12. The braking force sensor 12 described in this embodiment is an S-shaped tension sensor, and the S-shaped tension sensor is connected to the U-shaped bottom of the U-shaped clamping frame 13 via a universal joint. Tire connection seats 41 are provided on the inner sides of both ends of the U-shaped clamping frame 13. A freely rotatable test shaft is mounted on the tire connection seats 41. During operation, the wheel hub of the tire to be tested is mounted on the test shaft. Loading connection seats 17 are provided on the outer sides of each end of the U-shaped clamping frame 13. As can be seen from the figure, the loading connection seats 17 are connecting pins. A test slot 43 extending vertically through the upper plate 38 below the U-shaped clamping frame 13 is provided. Support rails are provided on the left and right sides of the test slots 43 on the lower sides of the two ends of the U-shaped clamping frame 13. Support slides 20 are provided on the support rails, which can slide freely forward and backward. The upper sides of the two support slides 20 are connected to the lower sides of the two ends of the U-shaped clamping frame 13 via shock-absorbing and buffering devices 18. The shock-absorbing and buffering devices 18 are pneumatic or hydraulic cylinders. The shock-absorbing and buffering devices 18 can also be shock-absorbing springs. They act as a shock absorber during braking, simulating the force applied to the actual tire during braking and providing more accurate data.

[0024] The structure of the tire loading mechanism is as follows: two loading guide rails 29 are vertically provided on the front side of the front side plate 24 of the test bench, and a loading slider 25 that can slide freely up and down is provided on the loading guide rail 29, and a loading crossbeam 26 is provided on the two loading sliders 25, and a loading connection portion is provided on the loading crossbeam 26; an upper guide pulley 19 is provided on the upper side of the upper plate 38 of the test bench below the loading connection seat 17, and a front guide pulley 23 is provided at the upper part of the front side of the test bench opposite to the upper guide pulley 19, and a loading rope 22 is connected to the loading connection seat 17, and the loading rope 22 is turned from vertically downward to forward through the upper guide pulley 19, and then rotated to rotate forward through the upper guide pulley 19. The front guide pulley 23 turns from forward to vertically downward and is then connected to the loading connection part. The loading connection part described in this embodiment is a force-equalizing connection pulley 27 provided on the front side of the loading beam 26 opposite the two front guide pulleys 23. The loading rope 22 is a single rope, the middle of which is located below the two force-equalizing connection pulleys 27. The two ends of the loading rope 22 are respectively guided by the front guide pulley and the upper guide pulley and then connected to the loading connection seat 17. During operation, the loading connection seats at both ends of the U-shaped clamping frame 13 are subjected to the same loading force, which is more in line with actual working conditions and has high test data accuracy. A loading force sensor 28 is provided below the loading beam 26. The loading force sensor 28 is an S-shaped tension sensor. A loading cylinder 30 is provided below the loading force sensor 28. The loading cylinder 30 is a double-acting cylinder. The piston rod of the loading cylinder 30 is connected to the loading force sensor 28 via a ball joint.

[0025] The tire brake mechanism is structured as follows: a handbrake 16 is mounted on the side of the wheel hub 15 on which the tire 14 to be tested is mounted; a brake handle 21 of the handbrake 16 is disposed on one side of an adjustment support plate 5, and a brake drag device is provided on the adjustment support plate 5, which is connected to the brake handle 21. The handbrake described in this embodiment is a manual disc brake system, comprising a handbrake caliper, a brake disc, and a brake handle. The brake disc is connected to the wheel hub 15 on which the test tire 14 is mounted or to the test shaft. The handbrake caliper and the brake disc are mounted in conjunction on a U-shaped clamping frame, and the handbrake caliper and the brake handle are connected by a brake cable. When the brake handle is subjected to force and pulls the brake cable, the brake cable pulls the handbrake caliper to clamp the brake disc, generating braking force and completing the braking operation. The handbrake can also be a manual holding brake or other existing handbrake. The brake-pulling device described in this embodiment comprises a brake base 2 mounted on one side of an adjustment support plate 5 below a brake handle 21. A control cylinder 1 is mounted on the underside of the brake base 2. The output shaft (piston rod) of the control cylinder 1 extends upward through the brake base 2. Two guide bars 11 are mounted on the brake base 2 on either side of the control cylinder 1. A load plate 3 is mounted on each guide bar 11 via sliding bearings, allowing it to slide up and down. The output shaft of the control cylinder 1 is located below the load plate 3, enabling it to be lifted and detached from the load plate 3. A weight mounting rod 6 is mounted on the upper side of the load plate 3 between the two guide bars 11. The upper end of the weight mounting rod 6 is hingedly connected to the brake handle via a connecting rod 39. Different weights 4 are placed on the load plates and weight mounting rods to adjust the braking force. When braking is required, the control cylinder 1 releases air pressure, disengaging the output shaft from the load plate 3. The load plate 3 then falls under the weight of the weights 4, driving the weight mounting rod 6 to pull the brake handle, automatically braking the vehicle. When braking is not required, the air is introduced into the control cylinder 1, and the output shaft pushes the bearing plate 3 upward, the brake handle is reset, and braking stops. By placing different weights on the bearing plate and the weight mounting rod, the braking force can be accurately controlled, and the operation is simple and convenient.

[0026] The structure of the road simulation drive mechanism is as follows: two bearing mounting seats 21 are provided on the lower side of the upper platform 38 on both sides of the test slot 43, and a road rotating shaft is mounted on the two bearing mounting seats 21 via bearings, and a simulation wheel hub 32 is mounted on the road rotating shaft, and a road simulation wheel 31 is mounted on the simulation wheel hub 32, the upper part of which protrudes from the upper side of the upper platform 38 through the test slot and contacts and cooperates with the tire being tested, a driven wheel 33 is provided on the road rotating shaft outside the bearing mounting seat, a driving motor 36 is provided on the lower platform 37, a driving wheel 35 is provided on the output shaft of the driving motor 36, and a transmission belt 34 is provided between the driving wheel 35 and the driven wheel 33.

[0027] The speed measuring mechanism is structured as follows: an encoder 42 is provided, a speed measuring driven wheel is mounted on the encoder 42, a speed measuring driving wheel is mounted on the test shaft, and the speed measuring driven wheel and the speed measuring driving wheel are connected via a transmission belt. The encoder 42 is fixedly mounted on a U-shaped clamping frame.

[0028] The adjustable support plate 5 of the present invention has upper and lower mounting beams 7 and 9 horizontally disposed on the upper and lower sides of its front side, respectively. Vertically disposed left and right guide posts 9 are provided on the left and right sides of the upper and lower mounting beams, respectively. Each of the left and right guide posts is provided with a slider that can slide freely up and down, and the connecting plate 10 is fixedly mounted on the sliders. The ball screw's screw 40 is rotatably mounted on the upper and lower mounting beams between the left and right guide posts 9. A rotating handle 8 is provided at the upper end of the ball screw's screw 10 above the upper mounting beam 7. By turning the handle 8, the ball screw's screw can be controlled to rotate, driving the connecting plate 10 to move up and down, meeting the requirements for testing tires of different diameters.

[0029] Figure 4 The actual braking friction force curve measured using the present invention shows that when the tire brakes, the tire braking mechanism will brake the tire, and at the same time, the road simulation wheel below will also stop the input of power by controlling the motor. Since the rotation speed of the road simulation wheel below is relatively high, if power is continued to be input when the tire brakes, it will cause damage to the tire braking mechanism. When the tire is braked during rotation, the friction force it is subjected to changes from rolling friction to sliding friction, so a sudden change in force value will occur in the horizontal direction. As long as the force in the horizontal direction of the tire can be detected in real time, the change in friction force when the tire brakes can be measured. Since the tire is clamped by a U-shaped clamping rod, and to accommodate tires of different sizes, the U-shaped clamping rod is also connected to a ball joint and a positioning device. Therefore, a force sensor is installed at the connection between the ball joint and the positioning device to measure the braking friction value.

[0030] When the present invention is working, the wheel hub 15 with the tire 14 to be tested is installed on the tire connecting seat 41 through the test shaft, and the lower part of the tire 14 contacts the road simulation wheel 31; the height of the connecting plate is adjusted by rotating the ball screw to make the U-shaped clamping frame and the braking force sensor 12 in a horizontal state; the loading cylinder 30 works, driving the loading beam 26 to move downward, driving the loading rope 22 to pull the loading connecting seat 17 downward, increasing the pressure between the tire 14 and the road simulation wheel, and realizing loading; the magnitude of the loading force can be controlled by the loading cylinder 30 and the loading force sensor 28 for feedback; the drive motor 36 works to drive the road simulation wheel 31 to rotate, and the road simulation wheel 31 drives the wheel to rotate; the encoder 42 detects the wheel speed, and when the wheel speed reaches the set value, the brake drag device works, driving the manual brake to work to brake the wheel; the braking force sensor detects the braking force exerted on the wheel during wheel braking. This invention enables more accurate measurement of tire braking force during braking. As the road simulation wheel rotates and drives the simulated road surface (road simulation wheel) to roll, the shock-absorbing and buffering device effectively reduces vibration and maintains vertical load. The support slider can slide freely back and forth on the support rail, resulting in more accurate measurement data. Tire loading is applied to the tire using a cylinder connected to a pulley block via a wire rope. Compared to displacement methods, this structure maintains a constant load, ensuring effective tire loading. The brake structure uses weights to achieve constant braking force through the brake structure, effectively achieving braking force loading under varying loads. This system can meet the needs of testing the braking performance of automobile tires under various speeds, loads, and wet conditions, laying the foundation for research and evaluation of tire braking performance.

Claims

1. An indoor tire braking performance speed measuring device, comprising a test bench, a tire clamping mechanism, a tire loading mechanism, a tire braking mechanism, a road surface simulation drive mechanism, and a speed measuring mechanism; the test bench includes an upper platform; characterized in that: The structure of the tire clamping mechanism is as follows: an adjusting support plate is provided on the side surface of the upper table, and a connecting plate that can slide freely up and down is provided on the front side of the adjusting support plate, and a ball screw is installed on the adjusting support plate, and a nut of the ball screw is fixedly connected to the connecting plate, and the front side of the connecting plate is connected to the U-shaped clamping frame via a braking force sensor, and tire connecting seats are provided on the inner sides of the two end portions of the U-shaped clamping frame, and loading connecting seats are respectively provided on the outer sides of the two end portions of the U-shaped clamping frame; a test slot that passes through the upper and lower parts is provided on the upper table below the U-shaped clamping frame, and support guide rails are respectively provided on both sides of the test slot, and a support slider that can slide freely back and forth is provided on the support guide rail; the upper sides of the two support sliders are respectively connected to the lower sides of the two end portions of the U-shaped clamping frame via a shock-absorbing and buffering device; The structure of the tire loading mechanism is as follows: two loading guide rails are vertically provided on the front side of the test bench, and a loading slide block that can slide freely up and down is provided on the loading guide rails, and a loading crossbeam is provided on the two loading slide blocks, and a loading connecting portion is provided on the loading crossbeam; an upper guide pulley is provided on the upper side of the test bench below the loading connecting seat, and a front guide pulley is provided at the upper part of the front side of the test bench opposite to the upper guide pulley, and a loading rope is connected to the loading connecting seat, and the loading rope is connected to the loading connecting portion after being guided by the upper guide pulley and the front guide pulley; a loading force sensor is provided below the loading crossbeam, and a loading cylinder is provided below the loading force sensor, and the piston rod of the loading cylinder is connected to the loading force sensor via a ball joint; The structure of the tire brake mechanism is as follows: a hand brake is installed on the side of the wheel hub on which the tire to be tested is installed, the brake handle of the hand brake is arranged on one side of the adjustment support plate, the adjustment support plate is provided with a brake drag device, and the brake drag device is connected to the brake handle; The structure of the road surface simulation drive mechanism is as follows: a bearing mounting seat is provided on the lower side of the upper platform, a road surface rotating shaft is mounted on the bearing mounting seat via a bearing, a road surface simulation wheel is mounted on the road surface rotating shaft and protrudes from the upper side of the upper platform through a test notch, a driven wheel is provided on the road surface rotating shaft, a drive motor is provided on the test bench, a driving wheel is provided on the output shaft of the drive motor, and a transmission belt is provided between the driving wheel and the driven wheel; The structure of the speed measuring mechanism is as follows: an encoder is provided, a speed measuring driven wheel is installed on the encoder, and a speed measuring driven wheel is installed on the test shaft. The speed measuring driving wheel, the speed measuring driven wheel and the speed measuring driving wheel are connected by a transmission belt; the encoder is fixedly mounted on the U-shaped clamping frame; the upper and lower sides of the front side of the adjustment support plate are respectively provided with upper mounting beams and lower mounting beams arranged horizontally in the left and right directions, and the left and right sides of the upper mounting beam and the lower mounting beam are respectively provided with vertically arranged left guide slide columns and right guide slide columns, and the left guide slide column and the right guide slide column are respectively provided with sliders that can slide freely up and down, and the connecting plate is fixedly mounted on the sliders.

2. The indoor tire braking performance speed measuring device according to claim 1, characterized in that: The screw of the ball screw is rotatably mounted on the upper mounting beam and the lower mounting beam, and a rotating handle is provided at the upper end of the screw of the ball screw above the upper mounting beam.

3. The indoor tire braking performance speed measuring device according to claim 1 or 2, characterized in that: The shock absorbing and buffering device is an air cylinder or an oil cylinder.

4. The indoor tire braking performance speed measuring device according to claim 3, characterized in that: The test bench includes a front side plate, and the loading guide rail is fixedly arranged on the front side plate; the loading connection part is provided with an equalizing connection pulley on the front side of the loading beam and opposite to the front guide pulley; there is one loading rope, the middle part of the loading rope is located under the two equalizing connection pulleys, and the two ends of the loading rope are respectively guided by the front guide pulley and the upper guide pulley and then connected to the loading connection seat.

5. The indoor tire braking performance speed measuring device according to claim 4, characterized in that: The brake dragging device is provided with a brake base below the brake handle, a control cylinder is installed on the brake base, two guide light bars are provided on the brake base on both sides of the control cylinder, and the two guide light bars are provided with a load-bearing plate that can slide freely up and down. The output shaft of the control cylinder is located on the lower side of the load-bearing plate and can lift and detach the load-bearing plate; a weight mounting rod is provided on the upper side of the load-bearing plate between the two guide light bars, and the upper end of the weight mounting rod is hinged to the brake handle through a connecting rod.

6. The indoor tire braking performance speed measuring device according to claim 5, characterized in that: The manual brake is a manual disc brake system, including a manual brake caliper, a brake disc and a brake handle. The brake disc is connected to the wheel hub or test shaft on which the test tire is mounted. The manual brake caliper and the brake disc are arranged in cooperation on a U-shaped clamping frame. The manual brake caliper and the brake handle are connected by a brake line.

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