A vehicle safety fixture for a chassis dynamometer

Abstract

This invention relates to a vehicle safety securing device for a chassis dynamometer, comprising a driven wheel securing device positioning assembly and a driven wheel securing device clamping assembly. The driven wheel securing device positioning assembly includes an axial positioning unit and a radial positioning unit. The axial positioning unit is used to adjust and fix the relative position between the left and right driven wheel securing devices, and the radial positioning unit is used to adjust and fix the relative position between the driven wheel securing device and the drive wheel axis. The driven wheel securing device clamping assembly includes two opposing arc-shaped clamps, the spacing and opening of which are adjustable. Compared with the prior art, this invention can adapt to different vehicle wheelbases and tire sizes, can synchronously and accurately position the left and right driven wheel securing devices, increases the contact area between the clamps and the tires, and optimizes the tire force angle, effectively improving vehicle safety during testing.

Description

Technical Field

[0001] This invention relates to the field of automotive testing technology, and in particular to a vehicle safety restraint device for a chassis dynamometer. Background Technology

[0002] A chassis dynamometer is an indoor bench test equipment used to test the performance of automobiles, including their power, emissions, and fuel consumption. The chassis dynamometer uses rollers to simulate road surfaces, calculates road resistance simulation equations, and uses a loading device to simulate the actual road resistance of a vehicle under various operating conditions.

[0003] When a car's drive wheels undergo simulated road testing on a chassis dynamometer, the driven wheels need to be secured to achieve proper vehicle positioning. Typically, the car is driven onto the test bench, with its drive wheels aligned with the dynamometer's rollers. A wheel-locking device located below or to the side of the test bench then secures the driven wheels. Existing wheel-locking devices are entirely mechanical, employing multiple clamping plates and bolts, resulting in significant overall weight. The clamping plates are planar, theoretically making line contact with the tires, but the contact line is relatively low; the larger the tire, the lower the contact line becomes. Furthermore, the tire clamping brackets use a scissor-like design, leading to uneven tire stress, and the left and right wheels are installed asynchronously, resulting in differences in position and stress.

[0004] The above factors make it impossible to safely and reliably meet the vehicle installation and positioning requirements during actual testing, which is not conducive to completing vehicle testing operations efficiently and accurately. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by providing a vehicle safety fixing device for a chassis dynamometer, which can intelligently install and position the vehicle wheels while ensuring accuracy and safety.

[0006] The objective of this invention can be achieved through the following technical solution: A vehicle safety fixing device for a chassis dynamometer, comprising a driven wheel fixing device positioning assembly and a driven wheel fixing device clamping assembly, both of which are communicatively connected to a controller. The driven wheel fixing device positioning assembly includes an axial positioning unit and a radial positioning unit. Under the action of the controller, the axial positioning unit is used to adjust and fix the relative position between the left and right driven wheel fixing devices, and the radial positioning unit is used to adjust and fix the relative position between the driven wheel fixing device and the drive wheel axis. The driven wheel fixing device clamping assembly includes two opposing arc-shaped clamping plates. Under the action of the controller, the distance and opening between the two arc-shaped clamping plates are adjustable.

[0007] Furthermore, the axial positioning unit includes an axial positioning cylinder, an axial moving cylinder, and an axial moving guide rail connected thereto.

[0008] Furthermore, the axial positioning cylinder is connected to an axial positioning pin.

[0009] Furthermore, the radial positioning unit includes a radial positioning cylinder, a first servo motor and a radial moving guide rail connected thereto, and a radial position sensor is installed on the radial moving guide rail; The radial position sensor is communicatively connected to the controller, which is connected to an alarm unit. If the radial position signal of the radial moving guide rail collected by the radial position sensor exceeds a preset threshold, the controller outputs a signal to the alarm unit to issue an alarm prompt.

[0010] Furthermore, the output end of the first servo motor is connected to the radial moving guide rail via a first threaded moving rod.

[0011] Furthermore, the radial positioning cylinder is connected to a radial positioning pin.

[0012] Furthermore, the lower parts of the two arc-shaped clamps are respectively connected to the output end of the second servo motor.

[0013] Furthermore, the output end of the second servo motor is connected to the lower part of the arc-shaped clamping plate via a second threaded moving rod, and a torque sensor and a clamping plate position sensor are installed on the arc-shaped clamping plate.

[0014] Furthermore, the second servo motor is mounted on the platform via a support rod, and one-way guide gear plates are movably connected to both ends of the platform, with the one-way guide gear plates connected to the upper part of the arc-shaped clamping plate.

[0015] Furthermore, the arc-shaped wall surface of the arc-shaped clamp adopts a hollow structure.

[0016] Compared with the prior art, the present invention has the following advantages: This invention designs a driven wheel fixing device positioning assembly and a driven wheel fixing device clamping assembly, which are respectively connected to a controller. The driven wheel fixing device positioning assembly includes an axial positioning unit and a radial positioning unit. The axial positioning unit is used to adjust and fix the relative position between the left and right driven wheel fixing devices, and the radial positioning unit is used to adjust and fix the relative position between the driven wheel fixing device and the drive wheel axis, thereby enabling synchronous and precise positioning of the left and right driven wheel fixing devices of the vehicle. The driven wheel fixing device clamping assembly includes two arc-shaped clamps arranged opposite each other. The distance and opening between the two arc-shaped clamps are adjustable, thereby adapting to different vehicle wheelbases and tire sizes, and increasing the contact area between the clamps and the tire, further improving the safety of the test vehicle.

[0017] This invention designs an axial positioning unit comprising an axial positioning cylinder, an axial moving cylinder, and an axial moving guide rail connected thereto. The axial positioning cylinder is connected to an axial positioning pin. A radial positioning unit comprises a radial positioning cylinder, a first servo motor, and a radial moving guide rail connected thereto. A radial position sensor is mounted on the radial moving guide rail, and the radial positioning cylinder is connected to a radial positioning pin. This enables intelligent completion of the positioning and installation process, eliminating the need for manual mechanical operation and improving installation and disassembly efficiency. Furthermore, the radial position sensor is communicatively connected to a controller, which is also connected to an alarm unit. During actual vehicle testing, considering frequent braking and acceleration, which generate significant vehicle inertial forces and cause slight movement of the test vehicle along with the entire fixed equipment, the controller will activate the alarm unit to issue an alarm signal when the position signal detected by the radial position sensor exceeds the distance change limit. This alerts the test personnel to control the vehicle, effectively reducing test risks.

[0018] This invention features a torque sensor and a clamping plate position sensor mounted on the arc-shaped clamping plate, which are driven by a second servo motor to ensure effective fixing and limiting of the driven wheel. In addition, the upper part of the arc-shaped clamping plate is connected to a unidirectional guide tooth plate. Utilizing the asymmetry of the tooth shape, with a gentle slope on one side and a steep locking surface on the other, the invention achieves the function of "one-way passage and reverse locking," which can reliably fix the position of the arc-shaped clamping plate.

[0019] The arc-shaped clamp designed in this invention has a hollow structure on its arc-shaped wall surface, which can optimize the contact force position between the clamp and the tire, increase the pressure contact angle, and effectively improve the safety of the test vehicle. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram illustrating the installation effect of the present invention; Figure 3 This is a schematic diagram of the arc-shaped wall surface of the arc-shaped clamping plate; The markings in the diagram are as follows: 101, Axial positioning cylinder; 102, Axial movement cylinder; 103, Axial movement guide rail; 201, Radial positioning cylinder; 202, First servo motor; 203, Radial movement guide rail; 204, Radial position sensor; 205, First threaded movement rod; 301, Arc-shaped clamping plate; 302, Second servo motor; 303, Second threaded movement rod; 304, Torque sensor; 305, Clamping plate position sensor; 306, Support rod; 307, One-way guide tooth plate. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] Example like Figure 1 and Figure 2 As shown, a vehicle safety fixing device for a chassis dynamometer includes a driven wheel fixing device positioning assembly and a driven wheel fixing device clamping assembly, which are respectively connected to a controller. The driven wheel fixing device positioning assembly includes an axial positioning unit and a radial positioning unit. The axial positioning unit is used to adjust and fix the relative position between the left and right driven wheel fixing devices. The axial positioning unit includes an axial positioning cylinder 101, an axial moving cylinder 102 and an axial moving guide rail 103 connected to it. The axial positioning cylinder 101 is connected to an axial positioning pin. The working state of the axial positioning cylinder 101 and the axial moving cylinder 102 is controlled and adjusted by the controller. The radial positioning unit is used to adjust the relative position between the fixed driven wheel fixing device and the drive wheel axis. The radial positioning unit includes a radial positioning cylinder 201, a first servo motor 202 and a radial moving guide rail 203 connected thereto. A radial position sensor 204 is installed on the radial moving guide rail 203. The output end of the first servo motor 202 is connected to the radial moving guide rail 203 through a first threaded moving rod 205. The radial positioning cylinder 201 is connected to a radial positioning pin. The working states of the radial positioning cylinder 201 and the first servo motor 202 are controlled and adjusted by the controller. In addition, the radial position sensor 204 is communicatively connected to the controller to transmit the collected position signal of the radial moving guide rail 203 to the controller. On the one hand, it is used to adjust the working states of the radial positioning cylinder 201 and the first servo motor 202 accordingly. On the other hand, when the position signal exceeds the distance change limit, the controller will control the alarm unit to issue an alarm signal to prompt the test personnel to control the vehicle, thereby effectively reducing the test risk. The driven wheel fixing device clamping assembly includes two opposing arc-shaped clamping plates 301, such as... Figure 3 As shown, the arc-shaped wall of the arc-shaped clamping plate 301 adopts a hollow structure. The distance and opening between the two arc-shaped clamping plates 301 are adjustable. The lower parts of the two arc-shaped clamping plates 301 are respectively connected to the output end of the second servo motor 302. The output end of the second servo motor 302 is connected to the lower part of the arc-shaped clamping plate 301 through the second threaded moving rod 303. A torque sensor 304 and a clamping plate position sensor 305 are installed on the arc-shaped clamping plate 301. The second servo motor 302 is mounted on the platform through the support rod 306. One-way guide tooth plates 307 are movably connected to both ends of the platform. The one-way guide tooth plates 307 are connected to the upper part of the arc-shaped clamping plate 301. The torque sensor 304 and the clamping plate position sensor 305 are respectively connected to the controller to transmit the collected clamping plate torque signal and clamping plate position signal to the controller for adjusting the working state of the second servo motor 302 accordingly.

[0023] In practical applications, the moving distance of the radial moving guide rail 203 and the initial installation angle and clamping torque of the arc-shaped clamping plate 301 are determined according to the wheelbase, tire radius and test mass of the test vehicle. The zero point is set according to the roller axis of the chassis dynamometer. After the drive wheel of the test vehicle is aligned with the roller, under the action of the controller, the first servo motor 202 and the second servo motor 302 drive the radial moving guide rail 203 and the arc-shaped clamping plate 301 to move respectively. The axial moving cylinder 102 drives the axial moving guide rail 103 to move. At the same time, the axial positioning cylinder 101 and the radial positioning cylinder 201 push the axial positioning pin and the radial positioning pin to move respectively, and finally complete the precise positioning and fixing of the driven wheel fixing device on the left and right sides of the vehicle. During the movement of the radial moving guide rail 203, the radial position sensor 204 will collect the position signal of the radial moving guide rail 203 in real time to change the working state of the first servo motor 202 accordingly; during the movement of the arc-shaped clamping plate 301, the torque sensor 304 and the clamping plate position sensor 305 will collect the torque and position signals of the arc-shaped clamping plate 301 in real time respectively to change the working state of the second servo motor 302 accordingly, and the unidirectional guide tooth plate 307 will ensure the final positioning and fixation of the arc-shaped clamping plate 301.

[0024] In this embodiment, the aforementioned vehicle safety fixing device is installed on the existing chassis dynamometer at the positions corresponding to the left and right driven wheels. The axial positioning cylinder 101, axial movement cylinder 102, radial positioning cylinder 201, first servo motor 202, radial position sensor 204, second servo motor 302, torque sensor 304, and clamp position sensor 305 are respectively connected to the touchscreen controller installed in the vehicle's driver's cabin to achieve an intelligent and automated installation and disassembly process. I. Vehicle Installation Select the vehicle model and tire type parameters on the touchscreen controller; The first servo motor 202 drives the radial moving guide rail 203 to move along the direction of vehicle travel; The radial positioning cylinder 201 pushes the radial positioning pin to complete the positioning and fixing of the radial moving guide rail 203; Adjust the opening of the two arc-shaped clamps 301 according to the tire model; The axial movement cylinder 102 drives the axial movement guide rail 103 to move closer to the driven wheel; According to the target torque, the second servo motor 302 drives the arc-shaped clamping plate 301 to move closer to clamp the driven wheel; The axial positioning cylinder 101 pushes the axial positioning pin to complete the positioning and fixing of the axial moving guide rail 103.

[0025] II. Vehicle Dismantling Select the disassembly option on the touchscreen controller; The second servo motor 302 drives the arc-shaped clamping plate 301 to move away from each other so as to restore the initial installation opening; Axial positioning cylinder 101 pulls axial positioning pin to return to the initial position, and axial moving cylinder 102 drives axial moving guide rail 103 to move away from driven wheel; Radial positioning cylinder 201 pulls radial positioning pin to restore the initial position, and first servo motor 202 drives radial moving guide rail 203 to move back to zero position; The second servo motor 302 drives the arc-shaped clamping plate 301 to restore its opening to zero.

[0026] In summary, compared to traditional purely manual methods, this solution utilizes servo motors, cylinders, and sensors (considering the high accuracy requirements for radial movement positioning, a servo motor drives the radial movement guide rail and the arc-shaped clamp; considering the lower accuracy requirements for axial movement positioning, a cylinder drives the axial movement guide rail; cylinders and positioning pins are also used for limiting both axial and radial movements). An arc-shaped clamp is also designed (optimizing the contact force position between the clamp and the tire; traditional flat clamps form tangential contact with the tire, resulting in a small contact area and a single force direction; the arc-shaped clamp has a larger contact area and more contact angles, applying pressure to the tire from multiple angles; compared to flat clamps, it significantly improves the safety of the test vehicle). This results in a vehicle safety fixing device for chassis dynamometers, capable of adapting to different vehicle wheelbases and tire sizes and achieving synchronous and precise positioning of the left and right tires, significantly reducing loading and unloading time.

Claims

1. A vehicle safety securing device for a chassis dynamometer, characterized in that, The device includes a driven wheel fixing device positioning assembly and a driven wheel fixing device clamping assembly, both of which are communicatively connected to a controller. The driven wheel fixing device positioning assembly includes an axial positioning unit and a radial positioning unit. Under the action of the controller, the axial positioning unit is used to adjust and fix the relative position between the left and right driven wheel fixing devices, and the radial positioning unit is used to adjust and fix the relative position between the driven wheel fixing device and the drive wheel axis. The driven wheel fixing device clamping assembly includes two arc-shaped clamping plates (301) arranged opposite to each other. Under the action of the controller, the distance and opening between the two arc-shaped clamping plates (301) can be adjusted.

2. The vehicle safety securing device for a chassis dynamometer according to claim 1, characterized in that, The axial positioning unit includes an axial positioning cylinder (101), an axial moving cylinder (102), and an axial moving guide rail (103) connected thereto.

3. A vehicle safety securing device for a chassis dynamometer according to claim 2, characterized in that, The axial positioning cylinder (101) is connected to an axial positioning pin.

4. A vehicle safety securing device for a chassis dynamometer according to claim 1, characterized in that, The radial positioning unit includes a radial positioning cylinder (201), a first servo motor (202) and a radial moving guide rail (203) connected thereto, and a radial position sensor (204) is installed on the radial moving guide rail (203). The radial position sensor (204) is connected to the controller, which is connected to an alarm unit. If the radial position signal of the radial moving guide rail (203) collected by the radial position sensor (204) exceeds a preset threshold, the controller outputs a signal to the alarm unit to issue an alarm prompt.

5. A vehicle safety securing device for a chassis dynamometer according to claim 4, characterized in that, The output end of the first servo motor (202) is connected to the radial moving guide rail (203) through the first threaded moving rod (205).

6. A vehicle safety securing device for a chassis dynamometer according to claim 4, characterized in that, The radial positioning cylinder (201) is connected to a radial positioning pin.

7. A vehicle safety securing device for a chassis dynamometer according to claim 1, characterized in that, The lower parts of the two arc-shaped clamps (301) are respectively connected to the output end of the second servo motor (302).

8. A vehicle safety securing device for a chassis dynamometer according to claim 7, characterized in that, The output end of the second servo motor (302) is connected to the lower part of the arc-shaped clamp (301) via a second threaded moving rod (303). A torque sensor (304) and a clamp position sensor (305) are installed on the arc-shaped clamp (301).

9. A vehicle safety securing device for a chassis dynamometer according to claim 7, characterized in that, The second servo motor (302) is mounted on the platform via a support rod (306). One-way guide gear plates (307) are movably connected to both ends of the platform, and the one-way guide gear plates (307) are connected to the upper part of the arc-shaped clamping plate (301).

10. A vehicle safety securing device for a chassis dynamometer according to any one of claims 1 to 9, characterized in that, The arc-shaped wall of the arc-shaped clamp (301) adopts a hollow structure.

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