A test device for testing road surface friction performance

Abstract

This utility model relates to the field of road surface friction performance testing technology, and in particular to a road surface friction performance testing device. It includes a base plate with multiple movable casters at its bottom. A first motor is fixedly connected to the bottom of the base plate. The output end of the first motor has a lead screw that passes through the base plate. A threaded sleeve is threaded to the outside of the lead screw. A fixed sleeve is slidably connected to the threaded sleeve and its bottom end is fixedly connected to the base plate. A fixed plate is fixedly connected to the top of the fixed sleeve. A guide rod passes through the fixed plate. A fixed frame is fixedly connected to the bottom end of the guide rod. The fixed frame and the fixed plate are connected by a spring sleeved on the outside of the guide rod. A second motor is fixedly connected to one side of the fixed frame. The output end of the second motor has a rotating rod that passes through the side wall of the fixed frame and is rotatably connected to it. A friction wheel is fixedly sleeved on the rotating rod. This utility model provides a road surface friction performance testing device with active pressure adjustment function.

Description

Technical Field

[0001] This utility model relates to the field of road surface friction performance testing technology, and in particular to a road surface friction performance testing device. Background Technology

[0002] Road surface friction performance testing is a crucial method for assessing road safety and durability, its core being the simulation of the friction between vehicle tires and the road surface. Traditional testing equipment typically employs a movable support platform carrying a rotating friction wheel, simulating the actual wear process through continuous contact between the friction wheel and the road surface. Such equipment requires stable mobility, adjustable friction pressure, and precise wear observation conditions to ensure the reliability of the test data. In existing technologies, such equipment largely relies on gravity to achieve contact between the friction wheel and the road surface, but this presents significant limitations in terms of pressure adjustment flexibility and test parameter controllability.

[0003] Current road friction testing equipment generally suffers from the following drawbacks: the pressure between the friction wheel and the road surface depends entirely on the equipment's own weight and the weight of the friction wheel assembly, making it impossible to dynamically adjust the pressure value according to testing requirements. This limitation makes the equipment difficult to adapt to test scenarios with different road surfaces or specific friction coefficients, and it cannot perform pressure gradient experiments. Furthermore, the gravity-dependent mode results in a constant contact pressure between the friction wheel and the road surface, making it impossible to simulate actual vehicle load variations or to achieve multi-pressure comparisons in a single test, severely restricting the testing accuracy and applicability. Utility Model Content

[0004] This invention provides a road surface friction performance testing device with active pressure adjustment function to solve the technical problem of uncontrollable friction degree.

[0005] The technical solution adopted by this utility model is as follows: a road surface friction performance testing device, including a base plate, a plurality of movable casters at the bottom of the base plate, a first motor fixedly connected to the bottom of the base plate, a lead screw passing through the base plate at the output end of the first motor, a threaded sleeve threadedly connected to the outside of the lead screw, a fixed sleeve slidably connected to the outside of the threaded sleeve and the bottom end of the fixed sleeve fixedly connected to the base plate, a fixed plate fixedly connected to the top end of the fixed sleeve, a guide rod passing through the fixed plate, a fixed frame fixedly connected to the bottom end of the guide rod, the fixed frame and the fixed plate being connected by a spring sleeved on the outside of the guide rod, a second motor fixedly connected to one side of the fixed frame, a rotating rod passing through the side wall of the fixed frame and rotatably connected to the output end of the second motor, a friction wheel fixedly sleeved on the rotating rod.

[0006] As a further improvement of this utility model, the number of movable casters is four, and they are distributed in a rectangular shape at the four corners of the bottom of the base plate.

[0007] As a further improvement of this utility model, a guide slider is fixedly connected to one side of the bottom end of the threaded sleeve, which passes through the side wall of the fixed sleeve, and a guide groove is provided on the side wall of the fixed sleeve for the guide slider to pass through and slide.

[0008] As a further improvement of this utility model, the base plate is provided with an opening for the fixing frame and the second motor to pass through.

[0009] As a further improvement of this utility model, the end of the rotating rod away from the second motor is rotatably connected to the fixed frame via a bearing.

[0010] As a further improvement of this utility model, the base plate is made of high-density metal material and is filled with counterweights.

[0011] The beneficial effects of this utility model are as follows: This utility model adjusts the overall height of the friction wheel by driving the lead screw mechanism with the first motor, and dynamically controls the vertical pressure of the friction wheel on the road surface by combining the elastic force generated by the spring compression deformation, completely breaking through the limitation of traditional equipment that relies on gravity for pressure adjustment. This design not only realizes stepless adjustment of friction pressure to meet the testing needs of different road surfaces and multi-gradient pressure, but also intuitively quantifies the pressure value through the spring deformation, significantly improving the testing accuracy and adaptability to working conditions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a road surface friction performance testing device according to this utility model;

[0013] Figure 2 This is a reference diagram showing the usage status of a road surface friction performance testing device according to this utility model;

[0014] Figure 3 This is a partial cross-sectional view of a road surface friction performance testing device according to this utility model;

[0015] Figure 4 This is a partial structural cross-sectional view of a road surface friction performance testing device according to this utility model.

[0016] As shown in the figure: 1. Base plate; 2. Movable casters; 3. First motor; 4. Lead screw; 5. Threaded sleeve; 6. Fixed sleeve; 7. Fixed plate; 8. Guide rod; 9. Fixed frame; 10. Spring; 11. Second motor; 12. Rotating rod; 13. Friction wheel; 14. Guide slider; 15. Guide groove; 16. Bearing. Detailed Implementation

[0017] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0018] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] This utility model provides the following: Figure 1-4 The road surface friction performance testing equipment shown includes a base plate 1, with multiple movable casters 2 at the bottom of the base plate 1. A first motor 3 is fixedly connected to the bottom of the base plate 1. The output end of the first motor 3 is provided with a lead screw 4 that passes through the base plate 1. A threaded sleeve 5 is threadedly connected to the outside of the lead screw 4. A fixed sleeve 6 is slidably connected to the threaded sleeve 5 and its bottom end is fixedly connected to the base plate 1. A fixed plate 7 is fixedly connected to the top of the fixed sleeve 6. A guide rod 8 passes through the fixed plate 7. A fixed frame 9 is fixedly connected to the bottom end of the guide rod 8. The fixed frame 9 and the fixed plate 7 are connected by a spring 10 sleeved on the outside of the guide rod 8. A second motor 11 is fixedly connected to one side of the fixed frame 9. A rotating rod 12 that passes through the side wall of the fixed frame 9 and is rotatably connected to it is provided at the output end of the second motor 11. A friction wheel 13 is fixedly sleeved on the rotating rod 12.

[0021] like Figure 1 and Figure 2 As shown, in this utility model, there are four movable casters 2, which are distributed in a rectangular shape at the four corners of the bottom of the base plate 1. This allows the equipment to maintain good stability during movement, avoids tilting or shaking due to uneven force, and ensures that the friction wheel 13 always maintains perpendicular contact with the road surface, thereby improving the accuracy of the test data.

[0022] like Figure 1 and Figure 3As shown, in this utility model, a guide slider 14 is fixedly connected to one side of the bottom end of the threaded sleeve 5, which passes through the side wall of the fixed sleeve 6. The side wall of the fixed sleeve 6 is provided with a guide groove 15 for the guide slider 14 to pass through and slide. Through the cooperation between the guide slider 14 and the guide groove 15, the movement trajectory of the threaded sleeve 5 is effectively restricted, so that it can only move up and down along the axial direction of the screw 4, preventing the threaded sleeve 5 from deviating during rotation, thereby ensuring the stability and reliability of the entire pressure regulating mechanism.

[0023] like Figure 1-3 As shown, the bottom plate 1 of this utility model has an opening for the fixing frame 9 and the second motor 11 to pass through. This opening design not only provides space for the installation of the fixing frame 9 and the second motor 11, but also makes the equipment structure more compact and reasonable, and facilitates the coordinated work between the components.

[0024] like Figure 4 As shown, in this utility model, the end of the rotating rod 12 away from the second motor 11 is rotatably connected to the fixed frame through the bearing 16. The use of the bearing 16 greatly reduces the friction when the rotating rod 12 rotates, making the rotation of the friction wheel 13 smoother, reducing energy loss, and further improving the accuracy of the detection results.

[0025] In this invention, the base plate 1 is made of high-density metal material and is filled with counterweights, which gives the base plate 1 sufficient weight and stability.

[0026] Working Principle: In practical implementation, the device is first moved to the location of the road surface to be inspected, and its positioning is easily achieved using the flexibility of the four movable casters. The first motor is then started, driving the lead screw to rotate. Because the lead screw is threadedly connected to the threaded sleeve, and the fixed sleeve fitted on the outside of the threaded sleeve restricts its rotation, the threaded sleeve can only move up and down along the axial direction of the lead screw. During this process, the guide slider slides along the guide groove, further ensuring the stability of the threaded sleeve's movement.

[0027] As the threaded sleeve moves up and down, the fixing plate connected to the top of the fixed sleeve also moves, which in turn drives the guide rod and the fixing bracket connected to the bottom of the guide rod to move up and down. At this time, the spring between the fixing bracket and the fixing plate will undergo corresponding compression or tension deformation, and the elastic force generated by the spring is the vertical pressure exerted by the friction wheel on the road surface. By controlling the rotation direction and number of revolutions of the first motor, the deformation of the spring can be precisely adjusted, thereby achieving stepless adjustment of the pressure between the friction wheel and the road surface.

[0028] Then, the second motor is started, driving the rotating rod to rotate. The friction wheel, fixedly mounted on the rotating rod, rotates accordingly, generating friction with the road surface to simulate the friction between a vehicle tire and the road. Because the end of the rotating rod furthest from the second motor is rotatably connected to the fixed frame via a bearing, frictional resistance during rotation is reduced, allowing the friction wheel to work more stably. Throughout the testing process, the base plate, cast from high-density metal and filled with counterweights, ensures the overall stability of the equipment, preventing interference from external factors and thus obtaining accurate and reliable road surface friction performance test data.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A road surface friction performance testing device, comprising a base plate (1), characterized in that: The bottom of the base plate (1) is provided with multiple movable casters (2). A first motor (3) is fixedly connected to the bottom of the base plate (1). The output end of the first motor (3) is provided with a lead screw (4) that passes through the base plate (1). A threaded sleeve (5) is threadedly connected to the outside of the lead screw (4). A fixed sleeve (6) is slidably connected to the outside of the threaded sleeve (5), and the bottom end of the fixed sleeve (6) is fixedly connected to the base plate (1). A fixed plate (7) is fixedly connected to the top end of the fixed sleeve (6). A guide rod (8) is provided on the fixed plate (7). A fixed frame (9) is fixedly connected to the bottom end of the guide rod (8). The fixed frame (9) and the fixed plate (7) are connected by a spring (10) sleeved on the outside of the guide rod (8). A second motor (11) is fixedly connected to one side of the fixed frame (9). The output end of the second motor (11) is provided with a rotating rod (12) that passes through the side wall of the fixed frame (9) and is rotatably connected to it. A friction wheel (13) is fixedly sleeved on the rotating rod (12).

2. The road surface friction performance testing equipment according to claim 1, characterized in that: The number of movable casters (2) is four, and they are arranged in a rectangle at the four corners of the bottom of the base plate (1).

3. The road surface friction performance testing equipment according to claim 1, characterized in that: The bottom end of the threaded sleeve (5) is fixedly connected to a guide slider (14) that passes through the side wall of the fixed sleeve (6). The side wall of the fixed sleeve (6) is provided with a guide groove (15) for the guide slider (14) to pass through and slide.

4. The road surface friction performance testing equipment according to claim 1, characterized in that: The base plate (1) has an opening for the fixing frame (9) and the second motor (11) to pass through.

5. The road surface friction performance testing equipment according to claim 1, characterized in that: The end of the rotating rod (12) away from the second motor (11) is rotatably connected to the fixed frame via a bearing (16).

6. The road surface friction performance testing equipment according to claim 1, characterized in that: The base plate (1) is made of high-density metal material and is filled with counterweights.

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