Dynamic load simulation device for brake inspection bench

Abstract

The utility model discloses a dynamic load simulation device for a brake inspection bench, which comprises a bearing frame preset underground and a bottom frame arranged at the bottom of the bearing frame, a bearing frame is mounted in the bottom frame through a lifting mechanism, a rotating roller is rotatably arranged in the bearing frame, and the lifting mechanism is used for driving the rotating roller to move up and down. An opening is formed in the bottom of the bearing frame; the rotating roller penetrates through the opening; transverse pushing mechanisms are arranged on the two sides in the bearing frame and used for driving the vertical bearing frame to move transversely, the vertical bearing frame is installed at one end of each transverse pushing mechanism, a bearing roller is rotationally arranged in the vertical bearing frame, a motor is further arranged on the vertical bearing frame and used for driving the bearing roller to rotate, and a torque detection mechanism is installed on the vertical bearing frame. The torque detection mechanism is used for detecting the rotating torque of the bearing roller in real time. Therefore, the pressure of the bearing rollers and the wheels on the two sides is increased, larger load adjusting amount is brought by small vehicle inclination change, and the stability is high in the brake detection process.

Description

Technical Field

[0001] This utility model belongs to the field of automotive testing technology, specifically relating to a dynamic load simulation device for brake testing benches. Background Technology

[0002] A vehicle brake test bench is a device used to test and evaluate the braking performance of a vehicle. This equipment is typically used to measure braking performance parameters such as braking force and brake balance of the vehicle's braking system. A vehicle brake test bench ensures that the vehicle's braking system meets safety standards and provides important information about the vehicle's braking performance.

[0003] Utility model patent application number 202420547543.4 discloses a vehicle loading brake platform, a roller drive assembly mounted on a bracket, the roller drive assembly being used to abut against the two front wheels or two rear wheels of the vehicle and drive the two front wheels or two rear wheels of the vehicle to rotate; a torque detection assembly mounted on the bracket, the torque detection assembly being used to detect the torque change of the roller drive assembly; and a lifting drive assembly mounted on a support frame, the output end of the lifting drive assembly being connected to the bracket, the lifting drive assembly being able to drive the bracket and the roller drive assembly to rise, thereby increasing the pressure between the two front wheels or two rear wheels of the vehicle and the roller drive assembly, thus simulating the vehicle being under load.

[0004] However, this type of brake testing platform adjusts the pressure between the two front wheels or two rear wheels and the roller drive assembly by raising the support and roller drive assembly through a lifting drive assembly. However, this method of adjusting the brake load requires the car to be lifted and tilted at a large angle to obtain a certain amount of load change; in addition, when the car is lifted and tilted at a large angle, it has a significant impact on the stability during the brake testing process.

[0005] Therefore, it is necessary to set up a dynamic load simulation device for the brake testing platform to meet actual needs. Utility Model Content

[0006] The purpose of this invention is to provide a dynamic load simulation device for a brake testing bench, in order to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dynamic load simulation device for a brake testing bench, comprising a bearing frame pre-installed underground and a bottom frame set at the bottom of the bearing frame, wherein a receiving frame is installed in the bottom frame via a lifting mechanism and a rotating roller is rotatably arranged in the receiving frame, the lifting mechanism being used to drive the rotating roller to move up and down, and the bottom of the bearing frame having an opening through which the rotating roller passes.

[0008] A transverse pushing mechanism is provided on both sides of the bearing frame. The transverse pushing mechanism is used to drive the vertical bearing frame to move laterally. The vertical bearing frame is installed at one end of the transverse pushing mechanism. A bearing roller is rotatably installed inside the vertical bearing frame. A motor is also installed on the vertical bearing frame and is used to drive the bearing roller to rotate. A torque detection mechanism is installed on the vertical bearing frame and is used to detect the rotation torque of the bearing roller in real time.

[0009] Compared with existing technologies, the advantages of this invention are: It controls the motor's operation, thereby driving the wheel to rotate via the bearing rollers. The motor's speed can be controlled by a servo driver to simulate the wheel rotating at different speeds. When the vehicle's braking system is activated, either the two front wheels or the two rear wheels begin braking and reducing their speed. The changes in torque and speed can be viewed on a computer during this process. When adjusting the braking load, the push rod of hydraulic cylinder two can be extended, causing the bearing rollers to move in opposite directions, thereby increasing the pressure between the bearing rollers and the wheel on both sides. This allows for a larger load adjustment with minimal changes in vehicle tilt, resulting in high stability during braking testing. Attached Figure Description

[0010] Figure 1 This is a front view schematic diagram of the dynamic load simulation device for the brake testing bench of this utility model.

[0011] Figure 2 This is a top view schematic diagram of the dynamic load simulation device for the brake testing bench of this utility model.

[0012] Figure 3 for Figure 1 A partial cross-sectional diagram;

[0013] Figure 4 for Figure 3 Schematic diagram of the lifting state of the hydraulic cylinder;

[0014] Figure 5 for Figure 2 A magnified structural diagram at point a.

[0015] In the diagram: 1. Bearing frame, 2. Base frame, 3. Hydraulic cylinder one, 4. Support frame, 5. Rotary roller, 6. Speed ​​sensor, 7. Hydraulic cylinder two, 8. Vertical support frame, 9. Pressure sensor, 10. Slider, 11. Bearing roller, 12. Support plate, 13. Mounting plate, 14. Torque sensor, 15. Motor. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] See Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides a dynamic load simulation device for a brake testing bench, including a bearing frame 1 pre-installed in concrete and a bottom frame 2 bolted to the bottom of the bearing frame 1. A receiving frame 4 is installed in the bottom frame 2 through a lifting mechanism, and a rotating roller 5 is rotatably installed in the receiving frame 4. The lifting mechanism is used to drive the rotating roller 5 to move up and down. The bottom of the bearing frame 1 is provided with an opening, and the rotating roller 5 passes through the opening.

[0018] Before the wheel travels between the bearing rollers 11, the lifting mechanism drives the rotating roller 5 to rise to be level with the upper side of the bearing roller 11, so that after the wheel travels between the bearing rollers 11, it provides initial support for the wheel. Then, the lifting mechanism drives the rotating roller 5 to move down until the rotating roller 5 is only in contact with the wheel.

[0019] A transverse pushing mechanism is provided on the left and right sides inside the bearing frame 1. The transverse pushing mechanism is used to drive the vertical bearing frame 8 to move laterally. The vertical bearing frame 8 is installed at one end of the transverse pushing mechanism. The bearing roller 11 is rotatably installed inside the vertical bearing frame 8. A motor 15 is installed on the vertical bearing frame 8 and the motor 15 is used to drive the bearing roller 11 to rotate. A torque detection mechanism is installed on the vertical bearing frame 8 and the torque detection mechanism is used to detect the rotation torque of the bearing roller 11 in real time.

[0020] When the wheel is positioned between the bearing rollers 11, the lateral pushing mechanism drives the bearing rollers 11 on both sides to move towards each other, and the bearing rollers 11 actively press against the wheel laterally, thereby increasing the pressure between the wheel and the bearing rollers 11 on both sides, thus simulating the load change during vehicle braking.

[0021] See Figure 2 , Figure 3 and Figure 4 The lifting mechanism includes a hydraulic cylinder 3 bolted to the base frame 2. In the simulation devices at the front and rear positions, the inlet and outlet ends of the hydraulic cylinder 3 are connected to one side of the inlet and outlet ends of a flow divider / combiner valve via pressure pipes. The other side of the flow divider / combiner valve is connected to one side of the inlet and outlet ends of an external mechanical directional valve via pressure pipes. The other side of the external mechanical directional valve is connected to the return and discharge ends of an external hydraulic pump via pressure pipes. The top flange of the hydraulic cylinder 3 is connected to the bottom of the support frame 4.

[0022] The top rod bolt of hydraulic cylinder 3 fixes the bearing surface of pressure sensor 1, and the pressure sensing surface of pressure sensor 1 is fixed to the bottom of the receiving frame 4. The signal line of pressure sensor 1 is connected to 485 transmitter, and connected to external computer through 485 transmitter.

[0023] Since the receiving frame 4 and its upper connecting components are known, the pressure value is monitored in real time by a pressure sensor, thereby understanding the support status of the roller 5 on the wheel in real time.

[0024] By setting up the flow divider and combiner valve, when the operator operates the mechanical directional valve to control the extension and retraction of the push rods of the two hydraulic cylinders 3, the push rods of the two hydraulic cylinders 3 on both sides extend and retract synchronously.

[0025] See Figure 2 The speed sensor 6 is fixed to the rear screw of the receiving frame 4, and the moving shaft of the speed sensor 6 is connected to the center of the rear end of the rotating roller 5 by an interference key.

[0026] The signal line of the speed sensor 6 is connected to an external computer via a 485 transmitter. When the wheel rotates, the wheel rotates under the influence of the bearing roller 11 because the roller 5 is in contact with the wheel. This causes the roller 5 to rotate. The speed sensor 6 monitors the speed of the roller 5 in real time. Since the ratio of the roller 5 to the outer circumference of the wheel is constant, the wheel speed is calculated from the speed of the roller 5. Therefore, when the torque value is obtained, the vehicle braking performance is reflected by the wheel speed.

[0027] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The lateral pushing mechanism includes hydraulic cylinders 7 bolted to the left and right sides of the bearing frame 1, and the end of the push rod of hydraulic cylinder 7 is mounted on the vertical bearing frame 8.

[0028] The inlet and outlet ends of the hydraulic cylinders 2 on both the left and right sides are connected to the inlet and outlet ends of one side of the diversion and combination valve 2 through pressure oil pipes. The inlet and outlet ends of the other side of the diversion and combination valve 2 are connected to the inlet and outlet ends of one side of the external mechanical directional valve 2 through pressure oil pipes. The inlet and outlet ends of the other side of the external mechanical directional valve 2 are connected to the return and discharge ends of the external hydraulic pump 2 through pressure oil pipes.

[0029] See Figure 3 and Figure 4 An installation groove is provided on the outer side of the support frame 8. The pressure sensor 9 is fixed in the installation groove with bolts, and the top rod flange of the hydraulic cylinder 7 is connected to the bearing surface of the pressure sensor 9.

[0030] By setting up the flow diversion and combination valve 2, when the operator operates the mechanical directional valve 2 to control the extension and retraction of the push rods of the two hydraulic cylinders 2 7, the push rods of the left and right hydraulic cylinders 2 7 will extend and retract synchronously.

[0031] When the push rod of hydraulic cylinder 2 7 is retracted to its shortest state, the lateral distance between the left and right bearing rollers 11 and the two sides of the bearing frame 1 is 15 cm, and the lateral distance between the bearing rollers 11 is 35 cm. With this setting, the car wheel can pass through the gap between the bearing rollers 11 and the bearing frame 1 relatively stably.

[0032] The top of the bearing roller 11 is 1 cm away from the top of the bearing frame 1, so that the car wheels can drive relatively stably between the bearing rollers 11.

[0033] In addition, anti-slip strips are uniformly arranged around the outer circumference of the bearing roller 11 to increase the frictional resistance between the bearing roller 11 and the wheel, thereby enabling the bearing roller 11 to effectively drive the wheel to rotate.

[0034] See Figure 2 , Figure 3 and Figure 4 The support plate 12 is bolted to the front and rear sides of the bearing frame 1. The support plate 12 is provided with a sliding groove. The support strip is integrally provided on the front and rear sides of the upright bearing frame 8 and the support strip is slidably disposed in the sliding groove. The slider 10 is bolted to the bottom of the upright bearing frame 8. The inner bottom of the bearing frame 1 is provided with a sliding groove and the slider 10 is slidably disposed in the sliding groove.

[0035] This configuration makes it more stable for hydraulic cylinder 7 to drive the vertical support frame 8 to move in opposite directions or in the opposite direction.

[0036] See Figure 2 and Figure 5 The torque detection mechanism includes a mounting plate 13 bolted to the rear side of the support frame 8, a torque sensor 14 bolted to the mounting plate 13, a motor 15 bolted to the rear of the mounting plate 13, the rotor shaft of the motor 15 passing through the mounting plate 13, an interference key connecting the rear center of the bearing roller 11 to the rotating shaft, the rotating shaft passing through the rear side of the support frame 8, and the two moving shafts of the torque sensor 14 connected to the rotor shaft and rotating shaft of the motor 15 respectively through coupling flanges.

[0037] All four motors 15 are servo motors. Each motor 15 has a screw-fixed bracket at its tail, through which an encoder is mounted. The encoder's rotating shaft is keyed to the center of the motor 15's rotor shaft. The power control terminal of the motor 15 is connected to the power control input terminal of the servo driver via a cable. The servo driver uses a PID control algorithm to control parameters such as the speed and position of the motor 15, achieving precise motion control. The encoder feeds back the actual position information of the motor 15 to the servo driver, which assists in correction, thus enabling the four motors 15 to operate synchronously. When the first two and the last two motors 15 start simultaneously, they rotate in opposite directions.

[0038] This setup results in greater force driving the car wheels to rotate, leading to faster acceleration with the same driving torque, and adapting to different acceleration conditions while simulating braking effects.

[0039] The torque sensor 14 is used to detect the torque change output from the motor 15 to the bearing roller 11. The signal line of the torque sensor 14 is connected to an external computer through a 485 transmitter to obtain torque data of each zone in real time. By combining the torque data with the speed data, the torque change during the braking process can be reflected.

[0040] The working principle of this embodiment is as follows: When in use, the push rod of the hydraulic cylinder 3 is extended until the top of the rotating roller 5 is level with the top of the bearing roller 11. The two front wheels or two rear wheels of the vehicle travel to the top of the two bearing rollers 11 and the rotating roller 5. Then the push rod of the hydraulic cylinder 3 is retracted, and the pressure value fed back by the pressure sensor is observed on the computer. The rotating roller 5 is in effective contact with the wheel.

[0041] Next, the motor 15 is controlled to run, thereby driving the wheel to rotate through the bearing roller 11. The speed of the motor 15 can be controlled by the servo driver to simulate the wheel rotating at different speeds. The vehicle's braking system is activated, causing the two front wheels or two rear wheels of the vehicle to brake and reduce their speed. At this time, the changes in torque and speed values ​​during the process can be viewed on the computer.

[0042] When adjusting the braking load, the push rod of hydraulic cylinder 2 7 can be extended to drive the bearing rollers 11 to move in opposite directions, thereby increasing the pressure between the bearing rollers 11 on both sides and the wheel. This allows for a larger load adjustment with a small change in vehicle tilt. During the adjustment process, the pressure value fed back from the pressure sensor 9 can be viewed through a computer, and the extension of the push rod of hydraulic cylinder 2 7 can be stopped based on the pressure change and the test requirements.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A dynamic load simulation device for a brake testing bench, comprising a support frame (1) pre-installed underground and a bottom frame (2) disposed at the bottom of the support frame (1), characterized in that: The bottom frame (2) is equipped with a support frame (4) by a lifting mechanism, and a rotating roller (5) is rotatably arranged inside the support frame (4). The lifting mechanism is used to drive the rotating roller (5) to move up and down. The bottom of the support frame (1) is provided with an opening and the rotating roller (5) passes through the opening. A transverse pushing mechanism is provided on both sides of the bearing frame (1). The transverse pushing mechanism is used to drive the vertical bearing frame (8) to move laterally. The vertical bearing frame (8) is installed at one end of the transverse pushing mechanism. A bearing roller (11) is rotatably arranged inside the vertical bearing frame (8). A motor (15) is also provided on the vertical bearing frame (8) and the motor (15) is used to drive the bearing roller (11) to rotate. A torque detection mechanism is installed on the vertical bearing frame (8) and the torque detection mechanism is used to detect the rotation torque of the bearing roller (11) in real time.

2. The dynamic load simulation apparatus of a brake testing bay according to claim 1, characterized in that: The lifting mechanism includes a hydraulic cylinder (3) installed in the base frame (2), and the top of the hydraulic cylinder (3) is connected to the bottom of the receiving frame (4).

3. The dynamic load simulation apparatus of claim 2, wherein: The rear of the receiving frame (4) is provided with a speed sensor (6), and the moving shaft of the speed sensor (6) is connected to the center of one end of the rotating roller (5).

4. The dynamic load simulation apparatus of claim 3, wherein: The lateral pushing mechanism includes hydraulic cylinders 2 (7) arranged on both sides inside the bearing frame (1), and the top rod end of the hydraulic cylinder 2 (7) is mounted with a vertical bearing frame (8).

5. The dynamic load simulation apparatus of claim 4, wherein: The support frame (8) is provided with an installation groove, and a pressure sensor (9) is installed in the installation groove. The top rod of the hydraulic cylinder (7) is installed on the bearing surface of the pressure sensor (9).

6. The dynamic load simulation apparatus of claim 4, wherein: The support frame (1) is provided with support plates (12) on the front and rear sides. The support plates (12) are provided with sliding grooves. The support frame (8) is provided with support bars on both sides and the support bars are slidably disposed in the sliding grooves. The bottom of the support frame (8) is provided with sliders (10). The inner bottom of the support frame (1) is provided with a sliding groove and the sliders (10) are slidably disposed in the sliding grooves.

7. The dynamic load simulation apparatus of a brake test stand according to claim 1, characterized in that: The torque detection mechanism includes a mounting plate (13) set on the support frame (8), a torque sensor (14) set on the mounting plate (13), a motor (15) mounted on the mounting plate (13), a rotating shaft connected to the center of one end of the bearing roller (11) and the rotating shaft passing through the support frame (8), and the two moving shafts of the torque sensor (14) are respectively connected to the rotor shaft and rotating shaft of the motor (15) through a coupling.

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