Pavement adhesive force and resistance testing platform

Abstract

The utility model provides a pavement adhesive force and resistance testing platform, which comprises a hub unit, a first driving unit, a rotating platform, a second driving unit and a first measuring unit, and is characterized in that the hub unit is used for simulating a vehicle; the first driving unit is connected with the hub unit and is used for driving the hub unit to rotate; the periphery of the rotating platform is in contact with a tire to simulate a road surface; the second driving unit is connected with the rotating platform and used for driving the rotating platform to rotate; the first measuring unit is connected with the rotating platform and used for measuring the friction force between the hub unit and the rotating platform. The periphery of the rotating platform is set to be in an irregular shape, different driving scenes such as a concave-convex large-structure road surface and uphill and downhill can be effectively simulated to obtain attachment and resistance parameters of a cross-country road surface, and technical support is provided for a power system to intelligently recognize road surface information and adjust power and a chassis in a cross-country scene.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle testing technology, and more specifically, relates to a road surface adhesion and resistance testing platform. Background Technology

[0002] With the improvement of people's living standards, the advancement of automotive technology, and the reduction of costs in my country, off-road vehicles have become one of the main means of transportation. At the same time, people are also beginning to pursue a better off-road experience. The stress on tires in off-road scenarios is extremely complex. Real off-road conditions are affected by factors such as the driver, weather, terrain, temperature, power supply, resupply, and stability repeatability, making effective measurement tests difficult. Therefore, there is an urgent need for a testing device that can simulate real off-road scenarios to obtain the adhesion and resistance parameters of typical off-road surfaces. Utility Model Content

[0003] The purpose of this invention is to provide a road surface adhesion and resistance testing platform to solve the problem of the complexity and difficulty in measuring tire forces.

[0004] To achieve the above objectives, this utility model provides a road surface adhesion and resistance testing platform, comprising:

[0005] A hub unit, which is used to simulate the wheels of a vehicle;

[0006] A first drive unit is connected to the hub unit and is used to drive the hub unit to rotate.

[0007] A rotating platform, the outer periphery of which is irregularly shaped and contacts the tire to simulate a road surface;

[0008] A second drive unit is connected to the rotating platform and is used to drive the rotating platform to rotate.

[0009] A first measuring unit, connected to the rotating platform, is used to measure the frictional force between the hub unit and the rotating platform.

[0010] Optionally, the test platform further includes an equivalent inertia unit, which includes:

[0011] An equivalent moment of inertia disk is provided, which is connected to the first driving unit. The first driving unit can simultaneously drive the hub unit and the equivalent moment of inertia disk to rotate, and make the hub unit and the equivalent moment of inertia disk rotate with the same moment of inertia.

[0012] A braking unit, which is connected to the equivalent moment of inertia disk and is used to provide an adjustable frictional force;

[0013] The second measuring unit is connected to the equivalent moment of inertia disk and is used to measure the frictional force between the braking unit and the equivalent moment of inertia disk, as well as the rotational speed of the equivalent moment of inertia disk.

[0014] Optionally, the braking unit includes:

[0015] A pair of braking modules, each of which is connected to one or both sides of the disk;

[0016] A pair of stepper motors, each of which is connected to a pair of braking modules and is used to adjust the pressure between the braking modules and the disc;

[0017] The second measuring unit includes:

[0018] A pair of friction force measuring modules, wherein the pair of friction force measuring modules are respectively disposed on the pair of braking modules;

[0019] A rotational speed sensor is disposed on the outer peripheral surface of the equivalent moment of inertia disk.

[0020] Optionally, the testing platform further includes a feeding unit, which includes:

[0021] A hopper is provided in front of the hub unit and has an inlet and an outlet. The outlet is aligned with the contact surface between the hub unit and the rotating platform.

[0022] A discharge limiter is provided at the discharge port and can move up and down to adjust the size of the discharge port.

[0023] Optionally, the hopper wall is provided with a plurality of holes for injecting air or water.

[0024] Optionally, the outer peripheral dimension of the rotating platform is larger than the outer peripheral dimension of the hub unit;

[0025] The outer periphery of the rotating platform has an uneven shape, and / or the outer periphery of the rotating platform is elliptical.

[0026] Optionally, the first driving unit includes:

[0027] A drive motor, used to provide driving force;

[0028] A speed reducer, which is connected to the gear of the drive motor;

[0029] A differential, wherein the differential is connected to the gear of the reducer;

[0030] The drive half-shaft, the equivalent moment of inertia disk and the hub unit are both connected to the differential through the drive half-shaft.

[0031] Optionally, the hub unit includes:

[0032] A wheel hub body, wherein the wheel hub body is connected to the first drive unit via the drive half-shaft;

[0033] Tire, the tire being disposed on the outer periphery of the wheel hub body;

[0034] A counterweight loading platform is connected to the drive half-shaft and positioned above the wheel hub body to simulate the pressure borne by the wheels of a real vehicle.

[0035] Optionally, the counterweight loading platform includes:

[0036] A frame, which is connected to the drive half-shaft;

[0037] A counterweight, wherein the counterweight is disposed on the frame;

[0038] Springs and shock absorbers are mounted on the frame to simulate the suspension system of a real vehicle.

[0039] A limiter, which is disposed on the frame, is used to limit the pressure direction of the counterweight.

[0040] Optionally, the stepper motor is a stepper motor.

[0041] The beneficial effects of this utility model are as follows: It provides a road surface adhesion and resistance testing platform, comprising: a wheel hub unit for simulating a vehicle, a first drive unit for driving the wheel hub unit to rotate, a rotating platform for simulating a road surface, a second drive unit for driving the rotating platform to rotate, and a first measuring unit for measuring the frictional force between the wheel hub unit and the rotating platform. The outer periphery of the rotating platform is set with an irregular shape, which can effectively simulate different driving scenarios such as uneven road surfaces and uphill / downhill slopes to obtain adhesion and resistance parameters of off-road surfaces, providing technical support for the intelligent identification of road surface information by the power system and the tuning of the power and chassis in off-road scenarios.

[0042] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0043] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0044] Figure 1 A schematic structural diagram of a road surface adhesion and resistance testing platform according to an embodiment of the present invention is shown.

[0045] Figure 2 A schematic structural diagram of the equivalent inertia unit according to an embodiment of the present invention is shown.

[0046] Figure 3 A schematic structural diagram of a feeding unit according to an embodiment of the present invention is shown.

[0047] Figure 4 One of the schematic structural diagrams of a rotating platform according to an embodiment of the present invention is shown.

[0048] Figure 5 A second schematic structural diagram of a rotating platform according to an embodiment of the present invention is shown.

[0049] Figure 6 A schematic structural diagram of a hub unit according to an embodiment of the present invention is shown.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Wheel hub unit; 11. Wheel hub body; 12. Tire; 13. Counterweight loading platform; 13a. Frame; 13b. Counterweight; 13c. Spring; 13d. Shock absorber; 13e. Limiter;

[0052] 2. First drive unit; 21. Drive motor; 22. Reducer; 23. Differential; 24. Drive half-shaft;

[0053] 3. Rotate the platform;

[0054] 4. Second drive unit;

[0055] 5. Equivalent inertia unit; 51. Equivalent moment of inertia disk; 52. Braking unit; 52a. Braking module; 52b. Stepper motor;

[0056] 6. Discharge unit; 61. Hopper; 62. Discharge limit; 63. Hole. Detailed Implementation

[0057] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0058] like Figure 1As shown, this embodiment provides a road surface adhesion and resistance testing platform, including:

[0059] Hub unit 1, hub unit 1 is used to simulate the wheels of a vehicle;

[0060] First drive unit 2, first drive unit 2 is connected to hub unit 1 and is used to drive hub unit 1 to rotate;

[0061] Rotating platform 3 has an irregular outer periphery that contacts tire 12 to simulate road surface;

[0062] The second drive unit 4 is connected to the rotating platform 3 and is used to drive the rotating platform 3 to rotate.

[0063] The first measuring unit is connected to the rotating platform 3 and is used to measure the frictional force between the hub unit 1 and the rotating platform 3.

[0064] In this embodiment, the rigidity of the rotating platform 3 is infinitely large, and its rotation center hardly undergoes elastic or plastic deformation. The first drive unit 2 can simulate the torque of the entire vehicle on each wheel, and the first drive unit 2 can be adjusted left, right, up, and down. A flexible connector and a self-aligning rolling platform are provided between the first drive unit 2 and the wheel hub unit 1 to passively eliminate the excitation caused by the inconsistency between the rotation centers of the first drive unit 2 and the wheel after deformation. When the first drive unit 2 simulates wheel drive, the wheel hub unit 1 and the rotating platform 3 make contact with each other through the ATS typical road surface, which can simulate the friction between the wheel and the ground on the road. The rotation center of the rotating platform 3 can undergo slight deformation in the front-rear direction, and this deformation can be fed back by the spring 13c or the strain device to the friction force generated by the friction between the wheel hub unit 1 and the rotating platform 3. Specifically, the outer periphery of the rotating platform 3 is set to an irregular shape, which can effectively simulate different driving scenarios such as uneven road surfaces and uphill and downhill slopes to obtain the adhesion and resistance parameters of off-road typical road surfaces, providing technical support for the intelligent identification of road surface information by the power system and the adjustment of power and chassis in off-road scenarios.

[0065] like Figure 2 As shown, optionally, the test platform also includes an equivalent inertia unit 5, which includes:

[0066] An equivalent moment of inertia disk 51 is connected to a first drive unit 2. The first drive unit 2 can simultaneously drive the hub unit 1 and the equivalent moment of inertia disk 51 to rotate, and make the hub unit 1 and the equivalent moment of inertia disk 51 rotate with the same moment of inertia.

[0067] Braking unit 52 is connected to equivalent moment of inertia disk 51 and is used to provide adjustable friction force;

[0068] The second measuring unit is connected to the equivalent moment of inertia disk 51 and is used to measure the frictional force between the braking unit 52 and the equivalent moment of inertia disk 51, as well as the rotational speed of the equivalent moment of inertia disk 51.

[0069] Specifically, the moment of inertia of the equivalent moment of inertia disk 51 is equivalent to that of the hub unit 1 on the other side. If they are not equivalent, the equivalence can be finely adjusted by adding or removing mass blocks. The equivalent moment of inertia disk 51 has a more regular shape on its surface, which is more compatible with test sensors. Its regular surface can be used to attach speed sensors, and its regular surface can be used for the motor to provide friction through stepping.

[0070] Optionally, the braking unit 52 includes:

[0071] A pair of braking modules 52a, which are respectively connected to the two side surfaces of the disk;

[0072] A pair of stepper motors 52b are connected to a pair of braking modules 52a respectively and are used to adjust the pressure between the braking module 52a and the disc;

[0073] The second measurement unit includes:

[0074] A pair of friction force measuring modules are respectively installed on a pair of braking modules 52a;

[0075] A rotational speed sensor is mounted on the outer peripheral surface of the equivalent moment of inertia disk 51.

[0076] Specifically, the friction force is adjusted by adjusting the stepping amount of the braking module 52a through the stepper motor 52b, thereby simulating and measuring the force state of the tire 12 under different slip states.

[0077] like Figure 3 As shown, optionally, the test platform also includes a feeding unit 6, which includes:

[0078] The hopper 61 is located in front of the hub unit 1 and has an inlet and an outlet. The outlet is aligned with the contact surface between the hub unit 1 and the rotating platform 3.

[0079] The discharge limit 62 is set at the discharge port and can move up and down to adjust the size of the discharge port.

[0080] Specifically, the hopper 61 can be filled with sand, snow, mud, and gravel through the inlet and discharged through the outlet to the contact surface between the hub unit 1 and the rotating platform 3 to simulate the cover of a homogeneous typical ATS road surface. The discharge limit 62 can adjust the size of the outlet and thus adjust the thickness of the cover to simulate snow, mud, sand, and gravel scenarios at different depths.

[0081] In this embodiment, the upper part of the hopper 61 is provided with an inclined surface, and at least part of the hopper 61 gradually narrows from top to bottom to imitate the state of snow, sand, mud and other materials that have been crushed to different degrees.

[0082] Optionally, the hopper wall is provided with a plurality of holes 63 for injecting air or water.

[0083] Specifically, the feed limiter 13e has a microhole 63 at its end that allows gas or liquid to pass through, which can change the hardness of sand and the viscosity of mud. Even if they are the same medium, air or water can be injected through the hole 63 to simulate sand and mud with different viscosities and hardness.

[0084] like Figure 4 and 5 As shown, optionally, the outer periphery of the rotating platform 3 is larger than the outer periphery of the hub unit 1;

[0085] The outer periphery of the rotating platform 3 has a concave-convex shape, and / or the outer periphery of the rotating platform 3 is elliptical.

[0086] Specifically, when simulating a heterogeneous, uneven road surface, the structural dimensions of the unevenness lie between the contact deformation of the tire 12 and the overall vehicle structural dimensions, and the surface of the rotating platform 3 is an irregular circle. When simulating uphill and downhill slopes, the structural dimensions of the slope are larger than the overall vehicle structural dimensions, and the rotating platform 3 can be the surface of an eccentric wheel. When simulating a composite surface, the unevenness and the uphill / downhill slopes can be superimposed for testing.

[0087] like Figure 1 As shown, optionally, the first drive unit 2 includes:

[0088] Drive motor 21;

[0089] Reducer 22 is connected to drive motor 21 via gears;

[0090] Differential 23 is connected to the gear of reducer 22;

[0091] The drive half-shaft 24, the equivalent moment of inertia disk 51, and the hub unit 1 are all connected to the differential 23 through the drive half-shaft 24.

[0092] Specifically, the drive motor 21 provides drive torque to drive the reducer 22 to rotate. The reducer 22 is connected to the differential 23. By transmitting torque through the reducer 22, the rotational speed of the differential 23 can be reduced, while the torque at the differential 23 can be increased. One side of the differential 23 is connected to the drive half-shaft 24 of the hub unit 1, which is driven to generate a rotational tendency.

[0093] like Figure 6 As shown, optionally, the hub unit 1 includes:

[0094] The hub body 11 is connected to the first drive unit 2 via the drive half shaft 24.

[0095] Tire 12, the tire 12 is disposed on the outer periphery of the wheel hub body 11;

[0096] The counterweight loading platform 13 is connected to the drive half shaft 24 and is located above the wheel hub body 11 to simulate the pressure borne by the wheels of a real vehicle.

[0097] In this embodiment, the drive motor 21 and the reducer 22 mesh with each other via gears, and the reducer 22 and the differential 23 mesh with each other via gears. One side of the output end of the differential 23 meshes with the drive half-shaft 24 connected to the wheel hub unit 1. The drive half-shaft 24 connected to the wheel hub unit 1 is connected to the counterweight loading platform 13, and the other side of the output end of the differential 23 is connected to the drive half-shaft 24 connected to the equivalent moment of inertia disk 51. The counterweight loading platform 13 can simulate the gravity loading of the whole vehicle between empty and fully loaded, so that the elastic deformation of the tire 12 of the wheel hub unit 1 is the same as the deformation of a real vehicle.

[0098] like Figure 6 As shown, optionally, the counterweight loading platform 13 includes:

[0099] Frame 13a, which is connected to drive half-shaft 24;

[0100] Counterweight 13b is mounted on frame 13a;

[0101] Spring 13c and shock absorber 13d are mounted on frame 13a to simulate the suspension system of a real vehicle.

[0102] Limiter 13e, which is disposed on frame 13a, is used to limit the pressure direction of counterweight 13b.

[0103] In this embodiment, the drive half-shaft 24 connected to the hub unit 1 is connected to the counterweight loading platform 13. The counterweight loading platform 13 has a limiter 13e, on which a counterweight 13b can be installed to simulate the normal pressure exerted by a real vehicle on the wheel axle. A spring 13c and a shock absorber 13d are installed on the counterweight loading platform 13 to simulate the suspension system of a real vehicle, simulating the impact of dynamic changes in off-road scenarios on the normal pressure on the wheels of a real vehicle. The counterweight 13b, installed on the limiter 13e, exerts pressure on the hub unit 1 through the counterweight loading platform 13; this pressure characterizes the pressure borne by the wheels of a real vehicle. The limiter 13e ensures that the counterweight 13b only exerts pressure on the axle of the hub unit 1, without any other tilting torque.

[0104] Optionally, the first drive unit 2 can adjust the rotational speed; the second drive unit 4 can adjust the rotational speed.

[0105] Specifically, the first drive unit 2 and the second drive unit 4 operate independently. Through independent adjustment, they can simulate states with different slip ratios, including pure rolling, limited slip, full slip, and full slip. For example, locking the first drive unit 2 can simulate the maximum friction force generated on a typical ATS road surface when the wheel hub unit 1 is fully locked. Locking the rotating platform 3 can simulate the maximum driving friction force generated on a typical ATS road surface when the wheel hub unit 1 is fully locked and the wheel is slipping. Changing the speeds of the first drive unit 2 and the rotating platform 3 can simulate the friction force generated on a typical ATS road surface under different slip ratios and braking conditions under different slip braking situations. Changing the speeds of the drive motor 21 and the rotating platform 3 can simulate the friction force generated on a typical ATS road surface under different slip driving situations with different slip ratios and driving conditions.

[0106] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A road surface adhesion and resistance testing platform, characterized in that, include: A hub unit (1) is used to simulate the wheels of a vehicle; A first drive unit (2) is connected to the hub unit (1) and is used to drive the hub unit (1) to rotate; A rotating platform (3) has an irregular outer periphery and contacts the tire (12) to simulate a road surface; The second drive unit (4) is connected to the rotating platform (3) and is used to drive the rotating platform (3) to rotate; The first measuring unit is connected to the rotating platform (3) and is used to measure the frictional force between the hub unit (1) and the rotating platform (3).

2. The road surface adhesion and resistance testing platform according to claim 1, characterized in that, The test platform also includes an equivalent inertia unit (5), which includes: An equivalent moment of inertia disk (51) is connected to the first drive unit (2). The first drive unit (2) can simultaneously drive the hub unit (1) and the equivalent moment of inertia disk (51) to rotate and make the hub unit (1) and the equivalent moment of inertia disk (51) rotate with the same moment of inertia. Braking unit (52), which is connected to the equivalent moment of inertia disk (51) and is used to provide adjustable frictional force; The second measuring unit is connected to the equivalent moment of inertia disk (51) and is used to measure the frictional force between the braking unit (52) and the equivalent moment of inertia disk (51) and the rotational speed of the equivalent moment of inertia disk (51).

3. The road surface adhesion and resistance testing platform according to claim 2, characterized in that, The braking unit (52) includes: A pair of braking modules (52a), the pair of braking modules (52a) being respectively connected to the two side surfaces of the disk; A pair of stepper motors (52b), each of the stepper motors (52b) is connected to a pair of braking modules (52a) and is used to adjust the pressure between the braking modules (52a) and the disc; The second measuring unit includes: A pair of friction force measuring modules, wherein the pair of friction force measuring modules are respectively disposed on the pair of braking modules (52a); A rotational speed sensor is disposed on the outer peripheral surface of the equivalent moment of inertia disk (51).

4. The road surface adhesion and resistance testing platform according to claim 1, characterized in that, The test platform also includes a feeding unit (6), which includes: The hopper (61) is located in front of the hub unit 1 and has an inlet and an outlet. The outlet is aligned with the contact surface between the hub unit (1) and the rotating platform (3). The discharge limit (62) is provided at the discharge port and can move up and down to adjust the size of the discharge port.

5. The road surface adhesion and resistance testing platform according to claim 3, characterized in that, The hopper (61) wall is provided with a plurality of holes (63), which are used to inject air or water.

6. The road surface adhesion and resistance testing platform according to claim 1, characterized in that, The outer circumferential dimension of the rotating platform (3) is larger than the outer circumferential dimension of the hub unit (1); The outer periphery of the rotating platform (3) has a concave-convex shape, and / or the outer periphery of the rotating platform (3) is elliptical.

7. The road surface adhesion and resistance testing platform according to claim 2, characterized in that, The first driving unit (2) includes: Drive motor (21); A speed reducer (22) is geared to the drive motor (21); Differential (23), the differential (23) is geared to the reducer (22); The drive half-shaft (24), the equivalent moment of inertia disk (51) and the hub unit (1) are both connected to the differential (23) through the drive half-shaft (24).

8. The road adhesion and resistance testing platform according to claim 7, characterized in that, The hub unit (1) includes: The hub body (11) is connected to the first drive unit (2) via the drive half shaft (24); Tire (12), the tire (12) being disposed on the outer periphery of the hub body (11); A counterweight loading platform (13) is connected to the drive half shaft (24) and is disposed above the wheel hub body (11) to simulate the pressure borne by the wheels of a real vehicle.

9. The road adhesion and resistance testing platform according to claim 8, characterized in that, The counterweight loading platform (13) includes: A frame (13a) is connected to the drive half-shaft (24); A counterweight (13b) is disposed on the frame (13a); A spring (13c) and a shock absorber (13d) are disposed on the frame (13a) to simulate the suspension system of a real vehicle; A limiter (13e) is disposed on the frame (13a) for limiting the pressure direction of the counterweight (13b).

10. The road surface adhesion and resistance testing platform according to claim 1, characterized in that, The first drive unit (2) can adjust the rotational speed; The second drive unit (4) can adjust the rotational speed.

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