Linear four-wheel steering test mechanism

Abstract

The invention discloses a linear four-wheel steering test mechanism, which specifically comprises a test chassis, four wheels mounted on the test chassis and a linear four-wheel steering assembly mounted on the test chassis, and also comprises a bottom plate, a rotating part mounted on the bottom plate, a supporting plate fixed on the rotating part, and a power unit mounted on the supporting plate; the adjusting unit is fixed on the supporting plate; according to the vehicle steering angle testing device, the wheels are actively driven to rotate through the designed power unit belt, so that the vehicle is simulated to run at different speeds, meanwhile, the vehicle steering angle can be measured in cooperation with the detection part, and in the testing process, the testing accuracy is improved. And through the adjusting unit, different driving road conditions can be simulated, and angle steering of different road conditions can be measured.

Description

Technical Field

[0001] The invention relates to the technical field of four-wheel steering testing, in particular to a linear four-wheel steering testing mechanism. Background Art

[0002] Four-wheel steer-by-wire is a vehicle steering technology that achieves more flexible and stable steering by controlling the steering of each of the vehicle's four wheels independently. Compared to traditional front-to-rear wheel linkage steering systems, four-wheel steer-by-wire improves vehicle handling and driving stability, while also enabling a smaller turning radius and higher steering efficiency. This system uses an electronic control unit (ECU) to precisely control vehicle steering, dynamically adjusting the steering angle of each wheel based on parameters such as vehicle speed, steering angle, and control input, resulting in more responsive and smooth steering.

[0003] During the development of a steering system, it is necessary to test the steering angles of the four wheels at different speeds to determine whether they meet the standards. Existing Chinese patent document CN117740412A discloses a steering control test platform for intelligent connected vehicles that can measure the steering angles of the vehicle's four wheels, thereby testing the four-wheel steering. However, this test method has a single operating environment and cannot simulate the measurement of the four-wheel steering angle on bumpy roads, nor can it determine whether the four-wheel steering system can automatically adjust the steering parameters according to different road conditions. Summary of the Invention

[0004] The purpose of the present invention is to provide a linear four-wheel steering test mechanism to solve the problem that the conventional test method proposed in the above background technology cannot simulate different road conditions, resulting in a single and unrepresentative test result.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A linear four-wheel steering test mechanism includes a test chassis with four wheels mounted on it and a linear four-wheel steering assembly mounted on it, through which the four-wheel steering is controlled. The mechanism also includes a base plate with a rotating portion mounted on it, a support plate fixed on it, a power unit mounted on it, through which the rotation of the wheels at different speeds is simulated; an adjustment unit fixed on the support plate, the adjustment unit is used to drive the tilt angle adjustment of one end of the power unit, thereby simulating the environment of the wheels traveling on bumpy roads; and a detection unit fixed to the rotating portion, through which the detection unit is connected to the wheels to test the steering angle of the vehicle.

[0006] As a further solution of the present invention: the rotating part includes a support seat fixed on the bottom plate, a bracket is rotatably mounted on the support seat, and the bracket is fixed to the support plate, and a ball is provided between the support seat and the bracket.

[0007] As a further solution of the present invention: the power unit includes a driving rod fixed to the support plate through a bearing seat, a driving wheel is fixed to the outside of the driving rod, and a driving belt is engaged with the outside of the driving wheel, a bracket is fixed to the outside of the driving rod and fits with the inner side of the driving belt, and a transmission wheel engaged with the driving belt is rotatably installed on one end of the bracket, an adjustment frame connected to the adjustment unit is fixed to the end of the bracket away from the driving rod, a driving motor is fixed to the support plate through a motor frame, and the output end of the driving motor is fixed to the outer end of the driving rod through a coupling.

[0008] As a further solution of the present invention: the adjustment unit includes a side plate fixed on the support plate, an eccentric rod is rotatably installed on the side plate, and an eccentric wheel is fixed on the outer side of the eccentric rod, and a driving member for driving the eccentric wheel to rotate is installed on the side plate, and the eccentric wheel is against the bottom of the adjustment frame.

[0009] As a further solution of the present invention: the driving member includes an adjusting motor fixed on the support plate, the output end of the adjusting motor is fixed with a small gear through a coupling, and the eccentric rod is fixed with a large gear meshing with the small gear.

[0010] As a further solution of the present invention: the detection part includes a support frame fixed to the outer side of the bracket, the support frame is L-shaped, and a steering angle detector is fixed to the outer side of its vertical end, a mounting opening is provided on the support frame, a docking hole is provided at the axis of the wheel, and a connector is installed in the mounting opening to be plugged into the docking hole.

[0011] As a further solution of the present invention: the connector includes an I-shaped tube slidably installed in the installation port, a pushing rod is slidably inserted in the installation port, the bottom of the pushing rod is fixed with a plate that fits with the outer side of the I-shaped tube, and the other end is fixed with an end block, the outer side of the pushing rod is covered with a pushing spring that pushes the plate toward the I-shaped tube, and a docking rod that is compatible with the docking hole is inserted in the I-shaped tube.

[0012] As a further solution of the present invention: a slot is provided on the outer side of the driving belt, and a vibration bar is inserted into the slot.

[0013] As a further solution of the present invention: a rotating cap is fixed to the outer end of the docking rod, and a thread groove is formed on one end of the docking rod close to the rotating cap, and is threadably connected to the I-type pipe through the thread groove.

[0014] As a further solution of the present invention: a support leg is fixed to the bottom of the support plate, and a universal ball that fits the bottom plate is installed on the bottom of the support leg and the bottom of the support plate.

[0015] Beneficial effects of the present invention: 1. The present invention actively drives the wheels to rotate through the designed power unit belt, thereby simulating the vehicle running at different speeds. At the same time, in conjunction with the detection unit, it can measure the vehicle's steering angle. During the test process, it can also simulate different road conditions through the adjustment unit to test the measurement of steering angles under different road conditions.

[0016] 2. The drive belt of the present invention is provided with slots for inserting vibration strips, so that when the wheels are driven to rotate, the vehicle can be vibrated to simulate driving on a gravel road. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] FIG1 is a schematic diagram of the structure of the test chassis of the present invention after docking with multiple power units; FIG2 is a schematic diagram of the structure of the test chassis of the present invention after being separated from multiple power units; FIG3 is a schematic diagram of the structure of components on the bottom plate of the present invention; FIG4 is a schematic structural diagram of the components on the bottom plate of the present invention from another angle; FIG5 is a schematic diagram of a partial cross-sectional structure of the rotating part of the present invention; FIG6 is a schematic diagram of the adjustment unit driving the power unit to tilt according to the present invention; FIG7 is a schematic diagram of the insertion of the slot and the vibration bar of the present invention.

[0019] In the figure: 1. test chassis; 2. wheel; 3. bottom plate; 4. rotating part; 5. support plate; 6. power unit; 7. adjustment unit; 8. detection part; 9. support seat; 10. bracket; 11. ball; 12. driving rod; 13. driving wheel; 14. driving belt; 15. bracket; 16. transmission wheel; 17. adjustment frame; 18. driving motor; 19. side plate; 20. eccentric rod; 21. eccentric wheel; 22. driving member; 23. adjustment motor; 24. small gear; 25. large gear; 26. support frame; 27. installation port; 28. docking hole; 29. connector; 30. I-shaped pipe; 31. tightening rod; 32. pasting plate; 33. tightening spring; 34. docking rod; 35. rotating cap; 36. supporting leg; 37. universal ball; 38. slot; 39. vibration bar. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1

[0022] See also Figure 1 - Figure 5 As shown, a linear four-wheel steering test mechanism includes a test chassis 1, four wheels 2 are mounted on the test chassis 1, and a linear four-wheel steering assembly is mounted on the test chassis 1, and the four-wheel steering is controlled by the linear four-wheel steering assembly; The linear four-wheel steering assembly includes a base plate 3, on which is mounted a rotating portion 4, on which is fixed a support plate 5, on which is mounted a power unit 6, which simulates the rotation of the wheel 2 at different speeds; an adjustment unit 7 fixed to the support plate 5, which is used to drive one end of the power unit 6 to adjust the tilt angle, thereby simulating the environment of the wheel 2 traveling on a bumpy road; and a detection unit 8 fixed to the rotating portion 4, which is connected to the wheel 2 through the detection unit 8 to test the vehicle steering angle. Specifically, the designed linear four-wheel steering assembly is installed on the test chassis 1 and is used to control the steering of the four wheels on the chassis. At the same time, the front wheel steering control on the chassis is remotely controlled by personnel. During the test, the test chassis 1 is lifted with the help of a gantry or other lifting mechanism, and then placed on the power unit 6 so that each wheel 2 is in contact with the power unit 6. The wheels 2 are docked with the detection unit 8, and then the power unit 6 is used to provide power so that the wheels 2 simulate the speed during driving. Then the personnel controls the steering of the front wheels, and the four wheels follow the rotation. The steering angle is obtained by using the detection unit 8. The adjustment unit 7 can also be used to drive the tilt angle adjustment of one end of the power unit 6, thereby realizing the environmental simulation of the wheel 2 driving on bumpy roads, improving the data that is more in line with the actual situation during the test process, and also detecting whether the linear four-wheel steering assembly can be adjusted accordingly under different road conditions, as well as the adjustment angle test.

[0023] In this embodiment, see Figure 3 - Figure 5 As shown, the rotating part 4 includes a support seat 9 fixed on the base plate 3, a bracket 10 is rotatably mounted on the support seat 9, the bracket 10 is fixed to the support plate 5, and a ball 11 is provided between the support seat 9 and the bracket 10. The axis of the support seat 9 and the bracket 10 is consistent with the steering center of the wheel 2 of the test chassis 1. The ball 11 improves the support stability and reduces the friction required for steering. In this embodiment, see Figure 3 - Figure 6 As shown, the power unit 6 includes a driving rod 12 fixed to the support plate 5 through a bearing seat, a driving wheel 13 is fixed to the outside of the driving rod 12, and a driving belt 14 is engaged with the outside of the driving wheel 13. A bracket 15 is fixed to the outside of the driving rod 12 and fits the inner side of the driving belt 14. A transmission wheel 16 meshing with the driving belt 14 is rotatably mounted on one end of the bracket 15, and an adjustment frame 17 connected to the adjustment unit 7 is fixed on the end of the bracket 15 away from the driving rod 12. A driving motor 18 is fixed to the support plate 5 through a motor frame, and the output end of the driving motor 18 is fixed to the outer end of the driving rod 12 through a coupling; the principle of the power unit 6 driving the wheel 2 to simulate driving: the driving motor 18 is operated to drive the driving rod 12 to rotate, thereby causing the driving wheel 13 and the driving belt 14 to rotate accordingly, and the wheel 2 is against the outer side of the driving belt 14, thereby being able to drive the wheel 2 to rotate accordingly, simulating driving at different speeds; Specifically, in order to prevent the driving belt 14 from being squeezed and dented by the wheel 2 , a bracket 15 is provided inside the driving belt 14 , and the bracket 15 is used to support the driving belt 14 to prevent it from being dented and affecting the driving of the wheel 2 .

[0024] In this embodiment, see Figure 3 、 Figure 5 and Figure 6 The adjustment unit 7 includes a side plate 19 fixed to the support plate 5, an eccentric rod 20 is rotatably mounted on the side plate 19, an eccentric wheel 21 is fixed to the outer side of the eccentric rod 20, and a driving member 22 for driving the eccentric wheel 21 to rotate is mounted on the side plate 19, and the eccentric wheel 21 is abutted against the bottom of the adjustment frame 17; The driving member 22 includes an adjusting motor 23 fixed on the support plate 5 . A small gear 24 is fixed to the output end of the adjusting motor 23 via a coupling. A large gear 25 meshing with the small gear 24 is fixed to the eccentric rod 20 .

[0025] The adjustment unit 7 simulates the principle of the wheel 2 running on different road conditions: first, the motor 23 is adjusted to rotate, driving the small gear 24 to rotate, and the large gear 25 to rotate synchronously, thereby causing the eccentric rod 20 and the eccentric wheel 21 to rotate synchronously. The rotation of the eccentric wheel 21 will lift the adjustment frame 17, as shown in FIG. Figure 6 As shown, the bracket 15 and one end of the drive belt 14 are tilted synchronously, and the wheel 2 is simulated to travel on a bumpy road section, so that the linear four-wheel steering assembly can be tested on a bumpy road section. If the wheel 2 is controlled to steer, the test result is more representative.

[0026] Specifically, the bottom of the adjustment frame 17 is in an arc shape, and both the bottom of the adjustment frame 17 and the outer side of the eccentric wheel 21 are smooth surface structures, so that the connection between the two is more stable and smooth.

[0027] Specifically, by adjusting the forward and reverse rotation of the motor 23, the eccentric wheel 21 can be rotated forward and reverse, and the height of the contact jacking corresponding to the adjustment frame 17 can be adjusted, thereby controlling the degree of bumping.

[0028] In this embodiment, see Figure 3 - Figure 5 The detection portion 8 includes a support frame 26 fixed to the outer side of the bracket 10. The support frame 26 is L-shaped, and a steering angle detector is fixed to the outer side of its vertical end. A mounting opening 27 is provided on the support frame 26, and a docking hole 28 is provided at the axis of the wheel 2. A connector 29 is installed in the mounting opening 27 and plugged into the docking hole 28. The steering angle detector is an existing device and is a tool for measuring the steering angle. Among them, the connector 29 includes an I-shaped tube 30 slidably installed in the installation port 27, a pushing rod 31 is slidably inserted in the installation port 27, the bottom of the pushing rod 31 is fixed with a plate 32 that fits with the outer side of the I-shaped tube 30, and the other end is fixed with an end block. The outer side of the pushing rod 31 is covered with a pushing spring 33 that pushes the plate 32 toward the I-shaped tube 30, and a docking rod 34 that is compatible with the docking hole 28 is inserted in the I-shaped tube 30.

[0029] The principle of the detection unit 8 detecting the steering of the vehicle 2: when the wheel 2 is placed on the drive belt 14, the personnel adjusts the position of the base plate 3 so that the axis of the support seat 9 and the bracket 10 is consistent with the steering center of the wheel 2 of the test chassis 1. Subsequently, the docking rod 34 is inserted into the docking hole 28, so that each subsequent time the wheel 2 turns, it can drive the docking rod 34 and the bracket 10 to turn accordingly, thereby making the entire support plate 5 and the components thereon turn accordingly. The personnel can then use the steering angle detector to detect the actual steering angle of the wheel 2. By comparing the four-wheel steering angle, it can be measured at different vehicle speeds. The corresponding steering angle of the rear wheel due to the steering of the front wheel can be measured. In conjunction with the adjustment unit 7, the measurement of the four-wheel steering angle under different road conditions can be tested, thereby obtaining data to judge the effect of the linear four-wheel steering assembly.

[0030] Specifically, in order to facilitate the installation of the docking rod 34, a rotating cap 35 is fixed to the outer end of the docking rod 34. A thread groove is opened at one end of the docking rod 34 close to the rotating cap 35, and the docking rod 34 is threadedly connected to the I-shaped tube 30 through the thread groove.

[0031] In this solution, the process of testing the steering of wheel 2 by the linear four-wheel steering assembly includes the following steps: In the first step, personnel first install the linear four-wheel steering assembly on the test chassis 1 and are able to control the rotation of the wheel 2; In the second step, the test chassis 1 is lifted by means of a gantry or other lifting equipment, and the base plate 3 is moved so that the power unit 6 is under the wheel 2. The axis of the support base 9 and the bracket 10 are adjusted so that they are aligned with the turning center of the wheel 2 of the test chassis 1. The third step is to insert the docking rod 34 in the detection unit 8 into the docking hole 28 reserved on the wheel 2, and reset the steering angle detector to zero; Step 4: The power unit 6 provides the power required for the wheels 2 to rotate, so that the wheels 2 perform corresponding steering operations at low and high speeds, and record the four-wheel steering angles; The fifth step is to adjust the corresponding angle of the driving belt 14 by driving the adjustment unit 7 to simulate different road conditions, and measure and record the four-wheel steering angle at low speed and high speed under different road conditions.

[0032] In this embodiment, when testing the linear four-wheel steering assembly, its steering angle can be accurately measured. At the same time, different road conditions can be simulated to test the four-wheel steering angle under different road conditions, thereby determining whether the linear four-wheel steering assembly can automatically adjust the steering parameters according to different road conditions, making its test results more representative.

[0033] Example 2: Please refer to Figure 3 、 Figure 4 as well as Figure 6 This embodiment further explains the first embodiment, and the difference lies in the optimization of the structure of the support plate 5.

[0034] Specifically, a support leg 36 is fixed to the bottom of the support plate 5 , and a universal ball 37 that fits with the bottom plate 3 is installed on the bottom of the support leg 36 and the bottom of the support plate 5 .

[0035] In this embodiment, since the support plate 5 is mainly supported by the bracket 10 and the support seat 9, and the structure designed on the support plate 5 is unevenly distributed, in order to avoid the support plate 5 from being skewed due to force and excessive friction during subsequent rotation, a support leg 36 is fixed to the bottom of the support plate 5. The support leg 36 shares part of the pressure, and the universal ball 37 is used to reduce friction.

[0036] Example 3: Please refer to Figure 7 This embodiment further explains other embodiments, and the difference lies in the optimization of the drive belt 14 structure.

[0037] Specifically, a slot 38 is provided on the outer side of the driving belt 14, and a vibration bar 39 is inserted into the slot 38. By inserting the vibration bar 39 into the slot 38, the driving belt 14 can be vibrated when the wheel 2 rotates, simulating the state of the wheel running on gravel, adding a simulation of an actual scenario, and improving the authenticity of the test.

[0038] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A linear four-wheel steering test mechanism, characterized in that: The invention comprises a test chassis (1), wherein a linear four-wheel steering assembly is installed on the test chassis (1), and four-wheel steering is controlled by the linear four-wheel steering assembly; and is characterized in that it further comprises: A base plate (3), a rotating portion (4) is mounted on the base plate (3), a support plate (5) is fixed on the rotating portion (4), a power unit (6) is mounted on the support plate (5), and the power unit (6) is used to simulate the rotation of the wheel (2) at different speeds; and an adjusting unit (7) fixed on the supporting plate (5), the adjusting unit (7) being used to drive the adjustment of the tilt angle of one end of the power unit (6), thereby achieving environmental simulation of the wheel (2) traveling on a bumpy road; and The detection part (8) is fixed to the rotating part (4), and the steering angle of the vehicle is tested by docking the detection part (8) with the wheel (2).

2. A linear four-wheel steering test mechanism according to claim 1, characterized in that: The rotating portion (4) comprises a support seat (9) fixed on the base plate (3), a bracket (10) is rotatably mounted on the support seat (9), and the bracket (10) is fixed to the support plate (5).

3. A linear four-wheel steering test mechanism according to claim 2, characterized in that: The power unit (6) includes a driving rod (12) fixed to a support plate (5) via a bearing seat, a driving wheel (13) fixed to the outside of the driving rod (12), and a driving belt (14) engaged with the outside of the driving wheel (13), and a bracket (15) fixed to the outside of the driving rod (12) and in contact with the inside of the driving belt (14).

4. A linear four-wheel steering test mechanism according to claim 3, characterized in that: The adjustment unit (7) includes a side plate (19) fixed on the support plate (5), an eccentric rod (20) is rotatably mounted on the side plate (19), and an eccentric wheel (21) is fixed on the outer side of the eccentric rod (20), and a driving member (22) for driving the eccentric wheel (21) to rotate is mounted on the side plate (19), and the eccentric wheel (21) abuts against the bottom of an adjustment frame (17) fixed at one end of the bracket (15) away from the driving rod (12).

5. A linear four-wheel steering test mechanism according to claim 4, characterized in that: The driving member (22) includes an adjusting motor (23) fixed on the support plate (5), a small gear (24) is fixed to the output end of the adjusting motor (23) via a coupling, and a large gear (25) meshing with the small gear (24) is fixed to the eccentric rod (20).

6. A linear four-wheel steering test mechanism according to claim 3, characterized in that: The detection portion (8) includes a support frame (26) fixed to the outer side of the bracket (10), the support frame (26) is L-shaped, and a steering angle detector is fixed to the outer side of the vertical end thereof, a mounting opening (27) is provided on the support frame (26), a docking hole (28) is provided at the axis of the wheel (2), and a connector (29) is installed in the mounting opening (27) and is plugged into the docking hole (28).

7. A linear four-wheel steering test mechanism according to claim 6, characterized in that: The plug-in connector (29) includes an I-shaped tube (30) slidably installed in the installation port (27), a pushing rod (31) is slidably inserted in the installation port (27), a bottom of one end of the pushing rod (31) is fixed with a plate (32) that fits with the outer side of the I-shaped tube (30), and an end block is fixed at the other end, a pushing spring (33) is sleeved on the outer side of the pushing rod (31) to push the plate (32) toward the I-shaped tube (30), and a docking rod (34) that matches the docking hole (28) is inserted in the I-shaped tube (30).

8. The linear four-wheel steering test mechanism according to claim 3, characterized in that: A slot (38) is provided on the outer side of the driving belt (14), and a vibration bar (39) is inserted into the slot (38).

9. The linear four-wheel steering test mechanism according to claim 7, characterized in that: A rotating cap (35) is fixed to the outer end of the docking rod (34), and a thread groove is formed at one end of the docking rod (34) close to the rotating cap (35), and is threadedly connected to the I-shaped tube (30) through the thread groove.

10. The linear four-wheel steering test mechanism according to claim 1, characterized in that: A support leg (36) is fixed to the bottom of the support plate (5), and a universal ball (37) that fits the bottom plate (3) is installed on the bottom of the support leg (36) and the bottom of the support plate (5).

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