Automobile braking force detection device

Abstract

An automobile braking force detection device disclosed by the present invention comprises an experiment table, the experiment table is provided with a left front wheel roller set, a right front wheel roller set and a rear wheel roller set, each of the left front wheel roller set, the right front wheel roller set and the rear wheel roller set comprises two conical rollers respectively located at the front side and the rear side of a wheel, the small-diameter section of each conical roller faces the left side, and the small-diameter section of each conical roller faces the right side. The diameter of a conical roller of the left front wheel roller set is smaller than that of a roller of the right front wheel roller set, the left front wheel roller set and the right front wheel roller set are inclined relative to the direction of a vehicle body, the left front wheel roller set and the right front wheel roller set are connected with a first motor through a first transmission mechanism, and the rear roller set is connected with a second motor through a second transmission mechanism. The first motor and the second motor are torque motors. The invention provides an automobile braking force detection device which can detect the braking force state of an automobile during steering.

Description

Technical Field

[0001] The invention relates to the technical field of automobile detection, in particular to an automobile braking force detection device. Background Art

[0002] In the field of automobile design and manufacturing, it is crucial to accurately test the performance of the vehicle under various driving conditions. In particular, the braking force performance of the vehicle during the steering process has an important impact on the safety and handling of the vehicle. In actual driving, when the car is turning, the different driving paths of the inner and outer wheels will cause the speed of the wheels on both sides to differ. This speed difference will have a significant impact on the vehicle's braking force distribution and braking effect.

[0003] Existing automobile braking force detection devices mainly focus on the braking performance of the vehicle in a straight-line driving state. These devices usually cannot simulate the state of different wheel speeds on both sides of the car when turning, so they cannot accurately measure the braking force during the turning process, and lack effective detection methods for the change of braking force during the turning process. Therefore, in order to more comprehensively evaluate and optimize the braking performance of the car, a device that can simulate and detect the braking force of the car during the turning process is needed. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention provides a vehicle braking force detection device, which can detect the braking force state of the vehicle when turning.

[0005] To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

[0006] A vehicle braking force detection device comprises a test bench, on which a left front wheel roller group, a right front wheel roller group and a rear wheel roller group are arranged, the left front wheel roller group, the right front wheel roller group and the rear roller group all comprise two tapered rollers respectively located at the front and rear sides of the wheel, a section with a smaller diameter of the tapered roller faces the left side, the tapered roller diameter of the left front wheel roller group is smaller than the roller diameter of the right front wheel roller group, the left front wheel roller group and the right front wheel roller group are inclined with respect to the vehicle body, the left front wheel roller group and the right front wheel roller group are connected to a first motor via a first transmission mechanism, the rear roller group is connected to a second motor via a second transmission mechanism, and the first motor and the second motor are torque motors.

[0007] Furthermore, the first motor is a double-axle extension motor, and the output shafts at both ends of the double-axle extension motor are respectively provided with first bevel gears, each of the first bevel gears is respectively connected to the second bevel gear, each of the second bevel gears is connected to the first gear through a transmission shaft, each of the first gears is meshed with two second gears, and the two second gears are connected to two conical rollers of the left front wheel roller group or the right front wheel roller group, and the first bevel gear, the second bevel gear, the first gear and the second gear constitute the first transmission mechanism.

[0008] Furthermore, the second transmission mechanism includes a third gear and a fourth gear, the third gear is connected to the output shaft of the first motor, the third gear is meshed with the two fourth gears, and the two fourth gears are respectively connected to the conical rollers of the rear wheel roller group.

[0009] Furthermore, the left front wheel roller group, the right front wheel roller group and the rear wheel roller group are respectively installed on a base, and the base is connected to the experimental platform.

[0010] Furthermore, the transmission shaft is a torsion shaft, one end of the torsion shaft is fixedly connected to a sleeve, the sleeve is provided with scales along the circumferential direction, and the torsion shaft is provided with an indicator needle corresponding to the scale.

[0011] Furthermore, the tapered roller of the rear wheel roller group includes an inner shaft, a left roller and a right roller, the inner shaft is connected to the output shaft of the second motor, the left roller is rotatably connected to the left end of the inner shaft, the right roller is rotatably connected to the right end of the inner shaft, the left roller and the right roller are respectively connected to the inner shaft through torsion springs, the ends of the left roller and the right roller are provided with scales along the circumferential direction, and the inner shaft is provided with an indicator needle corresponding to the scales.

[0012] Furthermore, it also includes an image collector, which is used to collect images of the scale and the indicator needle.

[0013] Furthermore, the experimental platform is provided with a fixed anchor, and the fixed anchor is fixed on the ground.

[0014] The beneficial effects of the present invention are as follows: during the experiment, the first motor drives the left front wheel roller group and the right front wheel roller group to rotate through the first transmission mechanism, and the second motor drives the rear roller group to rotate through the second transmission mechanism. The section with a smaller diameter of the tapered roller faces the left side of the vehicle, and the tapered roller diameter of the left front wheel roller group is smaller than the roller diameter of the right front wheel roller group. The left wheel speed of the experimental vehicle is smaller than the right wheel speed, simulating the state where the wheel speeds on both sides of the vehicle are different when turning. At this time, the vehicle brakes and detects the output torque of the first motor and the second motor, thereby calculating the magnitude of the braking force of the vehicle when turning. The present invention can measure the braking force during the turning process, provide a strong data basis for the braking force design during the turning process of the vehicle, and provide support for further research on the braking distance during the turning process and the vehicle offset during the braking process. The first motor and the second motor are torque motors, which can more conveniently measure the magnitude of the torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a vehicle braking force detection device in an embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of the structure of the tapered roller of the rear wheel roller group in the embodiment of the present application;

[0017] Description of Figure Numbers:

[0018] 1. Test bench; 2. Left front wheel roller group; 3. Right front wheel roller group; 4. Rear wheel roller group; 5. Conical roller; 6. First transmission mechanism; 7. First motor; 8. Second transmission mechanism; 9. Second motor; 10. First bevel gear; 11. Second bevel gear; 12. Transmission shaft; 13. First gear; 14. Third gear; 15. Fourth gear; 16. Base; 17. Sleeve; 18. Scale; 19. Indicator needle; 20. Inner shaft; 21. Left roller; 22. Right roller; 23. Torsion spring; 24. Second gear; 25. Fixed anchor. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, the expression "some embodiments" is related to a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0020] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0021] Please refer to the attached Figures 1-2 The present application provides a vehicle braking force detection device, including a test bench 1, on which a left front wheel roller group 2, a right front wheel roller group 3 and a rear wheel roller group 4 are arranged, the left front wheel roller group, the right front wheel roller group 3 and the rear roller group all include two conical rollers 5 located at the front and rear sides of the wheel respectively, the conical roller 5 with a smaller diameter faces the left side, the conical roller 5 of the left front wheel roller group 2 has a smaller diameter than the roller diameter of the right front wheel roller group 3, the left front wheel roller group 2 and the right front wheel roller group 3 are inclined with respect to the vehicle body, the left front wheel roller group 2 and the right front wheel roller group 3 are connected to a first motor 7 through a first transmission mechanism 6, the rear roller group is connected to a second motor 9 through a second transmission mechanism 8, and the first motor 7 and the second motor 9 are torque motors.

[0022] During the test, the test vehicle is placed on the test bench 1, the front wheels of the test vehicle are deflected to the left, and the left front wheel is located between the two tapered rollers 5 of the left front roller group, the right front wheel is located between the two tapered rollers 5 of the right front roller group, and the rear wheel is located between the two tapered rollers 5 of the rear wheel roller group 4. The left front wheel roller group 2 and the right front wheel roller group 3 are inclined with respect to the vehicle body, and when the wheels of the test vehicle are turned, the two front wheels can be located on the left front roller group and the right front roller group. During the experiment, the first motor 7 drives the left front wheel roller group 2 and the right front wheel roller group 3 to rotate through the first transmission mechanism 6, and the second motor 9 drives the rear roller group to rotate through the second transmission mechanism 8. The small diameter section of the tapered roller 5 faces the left side of the vehicle, and the diameter of the tapered roller 5 of the left front wheel roller group 2 is smaller than the roller diameter of the right front wheel roller group 3. The left wheel speed of the experimental car is smaller than the right wheel speed, simulating the state of different wheel speeds on both sides of the car when turning. At this time, the vehicle brakes and detects the output torque of the first motor 7 and the second motor 9, so as to calculate the braking force of the car when turning. The present invention can measure the braking force during the steering process, provide a strong data basis for the braking force design during the steering process of the car, and provide support for further research on the braking distance of the steering process and the vehicle offset during the braking process. The first motor 7 and the second motor 9 are torque motors, which can more conveniently measure the torque.

[0023] Preferably, in order to prevent the car from escaping from the conical roller 5 during the experiment, the height of the conical wheel can be set higher, and the car needs to overcome gravity to do more work when escaping, thereby achieving the effect of preventing the car from escaping from the conical roller 5. Optionally, a traction rope can be set on the test bench 1 to pull the car, or a limit rod can be set on the test bench 1 to block the chassis of the car from the bottom, thereby preventing the car from escaping from the conical roller 5 during the experiment.

[0024] Specifically, the first motor 7 is a double-axle extension motor, and the output shafts at both ends of the double-axle extension motor are respectively provided with first bevel gears 10, each of the first bevel gears 10 is respectively connected to the second bevel gear 11, each of the second bevel gears 11 is connected to the first gear 13 through the transmission shaft 12, each of the first gears 13 is meshed with two second gears 24, and the two second gears 24 are connected to the two conical rollers 5 of the left front wheel roller group 2 or the right front wheel roller group 3, and the first bevel gear 10, the second bevel gear 11, the first gear 13 and the second gear 24 constitute the first transmission mechanism 6. When the first motor 7 rotates, it directly drives the first bevel gears 10 at both ends to rotate, and then drives the second bevel gear 11, the transmission shaft 12, the first gear 13 and the second gear 24 to rotate in sequence through the first bevel gear 10, and the second gear 24 is connected to the two conical rollers 5 of the left front wheel roller group 2 or the right front wheel roller group 3, thereby driving the left front wheel roller group 2 and the right front wheel roller group 3 to rotate, and the left front wheel roller group 2 or the right front wheel roller group 3 respectively drives the left front wheel and the right front wheel of the car to rotate.

[0025] Specifically, the second transmission mechanism 8 includes a third gear 14 and a fourth gear 15, the third gear 14 is connected to the output shaft of the first motor 7, the third gear 14 is meshed with two fourth gears 15, and the two fourth gears 15 are respectively connected to the tapered rollers 5 of the rear roller set 4. When the second motor 9 rotates, the third gear 14 is driven to rotate, and the third gear 14 drives the tapered rollers 5 of the rear roller set to rotate through the fourth gear 15.

[0026] Specifically, the left front wheel roller group 2, the right front wheel roller group 3 and the rear wheel roller group 4 are respectively mounted on a base 16, and the base 16 is connected to the test bench 1. The base 16 improves the stability of the left front wheel roller group 2, the right front wheel roller group 3 and the rear wheel roller group 4.

[0027] Optionally, the transmission shaft 12 is a torsion shaft, one end of which is fixedly connected to a sleeve 17, the sleeve 17 is provided with a scale 18 along the circumferential direction, and the torsion shaft is provided with an indicator needle 19 corresponding to the scale 18. When the torque is transmitted, the transmission shaft 12 is twisted, so that the end of the sleeve 17 provided with the scale 18 is deflected relative to the indicator needle 19, and the magnitude of the torque is judged by observing the position indicated by the indicator needle 19. Preferably, an image collector is also included, and the image collector is used to collect images of the scale 18 and the indicator needle 19. The image collector is a high-speed camera, and the high-speed camera is used to shoot the rotating shaft and the sleeve 17 to obtain the position indicated by the indicator needle 19. The present invention can detect the braking force of the left front wheel and the right front wheel of the car during the steering process, and provide important data for the study of the influence of braking on the car when the car is steering, the roll tendency of the car when steering, and the tendency of deviation from the travel trajectory.

[0028] Specifically, the tapered roller 5 of the rear wheel roller group 4 includes an inner shaft 20, a left roller 21 and a right roller 22. The inner shaft 20 is connected to the output shaft of the second motor 9, the left roller 21 is rotatably connected to the left end of the inner shaft 20, and the right roller 22 is rotatably connected to the right end of the inner shaft 20. The left roller 21 and the right roller 22 are respectively connected to the inner shaft 20 through a torsion spring 23. The ends of the left roller 21 and the right roller 22 are provided with scales 18 along the circumferential direction, and the inner shaft 20 is provided with an indicator needle 19 corresponding to the scale 18. When the second motor 9 rotates, it drives the inner shaft 20 to rotate. The inner shaft 20 drives the left roller and the right roller 22 to rotate through the torsion spring 23. In the process of driving the rear vehicle to rotate, the torsion spring 23 will deform and cause the inner shaft 20 and the left roller and the right roller 22 to rotate relative to each other. The relative position of the indicator needle 19 and the scale 18 changes. By observing the position indicated by the indicator needle 19, the magnitude of the torque can be judged. Preferably, an image collector is also included, and the image collector is used to collect images of the scale 18 and the indicator needle 19. The image collector is a high-speed camera, which uses the high-speed camera to shoot the rotating shaft and the sleeve 17 to obtain the position indicated by the indicator needle 19.

[0029] Specifically, the experimental platform 1 is provided with a fixing anchor 25 , and the fixing anchor 25 is fixed on the ground to improve the stability of the experimental platform 1 .

[0030] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vehicle braking force detection device, characterized in that: The invention comprises a test bench, on which a left front wheel roller group, a right front wheel roller group and a rear wheel roller group are arranged, the left front wheel roller group, the right front wheel roller group and the rear roller group all comprise two conical rollers respectively located at the front and rear sides of the wheel, a section with a smaller diameter of the conical roller faces the left side, the conical roller diameter of the left front wheel roller group is smaller than the roller diameter of the right front wheel roller group, the left front wheel roller group and the right front wheel roller group are inclined with respect to the vehicle body, the left front wheel roller group and the right front wheel roller group are connected to a first motor via a first transmission mechanism, the rear roller group is connected to a second motor via a second transmission mechanism, and the first motor and the second motor are torque motors.

2. The vehicle braking force detection device according to claim 1, characterized in that: The first motor is a double-axle extension motor, and the output shafts at both ends of the double-axle extension motor are respectively provided with first bevel gears, each of the first bevel gears is respectively connected to the second bevel gear, each of the second bevel gears is connected to the first gear through a transmission shaft, each of the first gears is meshed with two second gears, and the two second gears are connected to the two conical rollers of the left front wheel roller group or the right front wheel roller group, and the first bevel gear, the second bevel gear, the first gear and the second gear constitute the first transmission mechanism.

3. The vehicle braking force detection device according to claim 1, characterized in that: The second transmission mechanism includes a third gear and a fourth gear, the third gear is connected to the output shaft of the first motor, the third gear is meshed with the two fourth gears, and the two fourth gears are respectively connected to the conical rollers of the rear wheel roller group.

4. The vehicle braking force detection device according to claim 1, characterized in that: The left front wheel roller group, the right front wheel roller group and the rear wheel roller group are respectively installed on a base, and the base is connected to the experimental platform.

5. The vehicle braking force detection device according to claim 2, characterized in that: The transmission shaft is a torsion shaft, one end of the torsion shaft is fixedly connected with a sleeve, the sleeve is provided with scales along the circumferential direction, and the torsion shaft is provided with an indicating needle corresponding to the scale.

6. The vehicle braking force detection device according to claim 3, characterized in that: The tapered roller of the rear wheel roller group includes an inner shaft, a left roller and a right roller. The inner shaft is connected to the output shaft of the second motor, the left roller is rotatably connected to the left end of the inner shaft, and the right roller is rotatably connected to the right end of the inner shaft. The left roller and the right roller are respectively connected to the inner shaft through torsion springs, and the ends of the left roller and the right roller are provided with scales along the circumferential direction, and the inner shaft is provided with an indicator needle corresponding to the scales.

7. The vehicle braking force detection device according to claim 1, characterized in that: It also includes an image collector, which is used to collect images of the scale and the indicator needle.

8. The vehicle braking force detection device according to claim 1, characterized in that: The experimental platform is provided with a fixing anchor, and the fixing anchor is fixed on the ground.

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