Driving mechanism and traction system for testing driving assistance system

Abstract

The utility model relates to a driving mechanism and a traction system for testing a driving auxiliary system, which belong to the technical field of automobile active safety testing and comprise a base, a driving wheel, a driven wheel, a guide wheel assembly and a reversing assembly. The driving wheel and the driven wheel are symmetrically installed on the bottom face of the machine base. The base is integrated at the bottom of the electrical box, the driving motor is mounted in the electrical box, and the driving wheel is driven by the driving motor to rotate; two guide holes are symmetrically formed in one side wall of the machine base, and the two guide wheel assemblies are installed in the two guide holes respectively. The reversing assembly is arranged on the outer side of the machine base between the two guide wheel assemblies; the belt penetrates through one end of the reversing assembly in a horizontal posture and penetrates through the guide wheel assembly in a longitudinal posture, and then the belt is sequentially in meshing transmission connection with the driving wheel and the driven wheel, penetrates through the other guide wheel assembly in the longitudinal posture and penetrates out of the other end of the reversing assembly in the horizontal posture. The risk that a vehicle stumbles the belt is reduced, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile active safety testing, in particular to a driving mechanism and a traction system for testing a driving assistance system. Background Art

[0002] In 2020, China Automotive Technology and Research Center Co., Ltd. released the 2021 version of C-NCAP (China New Car Assessment Program). Regarding the active safety ADAS (Advanced Driver Assistance System) system test, when the vehicle is conducting AEB (automatic emergency braking) related lateral and longitudinal scenario tests (that is, the test scenario where the test vehicle follows the target object), a reference target is required to test the ADAS system response of the test vehicle. The C-NCAP regulations set out the external dimensions and related feature specifications of the target object, as well as the requirements for the movement of the target object. In order to ensure the safety of the test, the target object is made of soft materials and does not have the ability to move on the ground. In response to regulatory requirements, the traction device provides a certain speed and acceleration for the target object, and realizes mutual communication with the test vehicle driving data.

[0003] However, the test devices currently used usually adopt a driving mechanism to drive the synchronous belt to pull the target object to move. However, the synchronous belt of the existing test device is high above the ground, and the vehicle is easy to trip over the synchronous belt during the test, which has low safety. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a driving mechanism and traction system for testing a driving assistance system, wherein the driving mechanism integrates the functions of driving, guiding and tensioning, and can smoothly drive the belt to pull the target object to move. In addition, during the test, the synchronous belt can be kept close to the ground, which is highly safe and reduces the risk of the vehicle tripping over the belt.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0006] A driving mechanism for testing a driving assistance system, the driving mechanism comprising a base, a driving wheel, a driven wheel, a guide wheel assembly, and a reversing assembly; the driving wheel and the driven wheel are symmetrically mounted on the bottom surface of the base; the base is integrated at the bottom of an electrical box, a driving motor is mounted in the electrical box, an output shaft of the driving motor passes through the base and is connected to the driving wheel, and the driving wheel is driven to rotate by the driving motor; two guide holes are symmetrically arranged on one side wall of the base, and two guide wheel assemblies are respectively mounted in the two guide holes; the reversing assembly is mounted on the outside of the base between the two guide wheel assemblies;

[0007] The belt passes through one end of the reversing assembly in a horizontal posture and passes through the guide wheel assembly in a longitudinal posture. The belt then meshes and drives with the driving wheel and the driven wheel in sequence, passes through another guide wheel assembly in a longitudinal posture, and then passes out from the other end of the reversing assembly in a horizontal posture.

[0008] Furthermore, the driving mechanism also includes a tensioning mechanism; the tensioning mechanism includes an adjusting structure and a tensioning wheel; the tensioning wheel is installed on the adjusting structure between the driving wheel and the driven wheel, and the belt passes around the driving wheel, the tensioning wheel, and the driven wheel in sequence; the tensioning wheel moves under the drive of the adjusting structure to adjust the tension of the belt.

[0009] Further, the adjustment structure includes a guide shaft rear support, a guide shaft, a guide shaft front support, an adjustment handle, an adjustment nut, an adjustment support, an adjustment screw, a tensioning spring, a screw end support, a tensioning wheel support and an auxiliary spring;

[0010] The two guide shafts are parallel to each other, and the two ends of the guide shafts are respectively mounted on the guide shaft rear support and the guide shaft front support; the two ends of the adjustment support and the tensioning wheel support are respectively sleeved on the two guide shafts and can slide along the guide shafts; the adjustment nut is fixed on the adjustment support, and the tensioning wheel is mounted in the middle of the tensioning wheel support;

[0011] The two tensioning springs between the adjusting support and the tensioning wheel support are respectively sleeved on the two guide shafts, and the two auxiliary springs between the tensioning wheel support and the guide shaft front support are respectively sleeved on the two guide shafts;

[0012] In the middle of the two guide shafts, one end of the adjusting screw rod passes through the adjusting nut and the guide shaft rear support in sequence, and is fixedly connected to the adjusting handle, and the adjusting nut is threadedly connected to the adjusting screw rod; the other end of the adjusting screw rod is installed on the screw rod end support;

[0013] The adjusting handle rotates the adjusting screw to drive the adjusting nut to move linearly along the adjusting screw, and the adjusting support slides along the guide shaft between the rear support of the guide shaft and the end support of the screw; the adjusting support drives the tensioning wheel support to slide along the guide shaft through the tensioning spring.

[0014] Furthermore, the adjusting screw is connected to the rear support of the guide shaft and the end support of the screw through bearing rotation pairs respectively.

[0015] Furthermore, the adjusting screw rod has step surfaces on the inner sides of the guide shaft rear support and the screw rod end support respectively, and the adjusting screw rod is connected to the guide shaft rear support and the screw rod end support respectively by a planar kinematic pair through the step surfaces.

[0016] Furthermore, the guide wheel assembly includes a roller, a rolling bearing and a roller support; the roller support is a U-shaped roller support; the U-shaped openings of the two roller supports are arranged opposite to each other, and the upper and lower ends of the roller are longitudinally installed on the roller support through the rolling bearings respectively.

[0017] Furthermore, the reversing assembly includes two pairs of guide wheels and two guide wheel shafts; the two guide wheel shafts are arranged in parallel up and down, and the guide wheels are respectively installed at both ends of the two guide wheel shafts, and the guide wheels can rotate around the guide wheel shafts.

[0018] Furthermore, ribs are provided between the driving wheel, the driven wheel and the guide wheel assembly, respectively, and the belt passes through the middle grooves of the ribs.

[0019] Furthermore, a plurality of auxiliary wheels are distributed outside the circumference of the driving wheel and the driven wheel; and the auxiliary wheels are arranged outside the turning point of the rib.

[0020] The utility model also discloses a traction system for testing a driving assistance system, the traction system comprising any one of the above described drive mechanisms, trays, traction terminals and belts;

[0021] The belt is an endless belt; the two ends of the belt are respectively mounted on the driving mechanism and the traction end; the tray is mounted on the belt between the driving mechanism and the traction end; the driving mechanism pulls the belt to drive the tray to move linearly along the transmission direction of the belt; the target object to be tested is mounted on the tray and moves with the tray.

[0022] Beneficial effects of the utility model:

[0023] The utility model has a simple structure and an ingenious design, reduces the risk of the vehicle tripping over the belt and has high safety.

[0024] The utility model combines the use of a guide wheel assembly and a reversing assembly, so that the belt is transmitted outside the driving mechanism with the back side touching the ground, reducing the height of the belt from the ground, protecting the front tooth shape of the belt, and connecting with the driving wheel, the driven wheel, the tensioning wheel, etc. in a longitudinal posture in the driving mechanism, while increasing the service life of the belt, it is also conducive to realizing the belt transmission in the driving mechanism. Because the utility model can reduce the height of the belt, the risk of the vehicle tripping over the belt is greatly reduced, and the test safety is improved.

[0025] The utility model can manually rotate the adjustment handle through the tensioning mechanism to fine-tune the tensioning degree of the belt, has a simple structure, is easy to operate and has low cost.

[0026] The utility model provides a limit for the belt transmission through the auxiliary wheel, which can prevent the belt from curling inside the drive mechanism when it is loose and causing the drive mechanism to get stuck. In addition, the belt transmission is limited and guided by the retaining edge, and the belt transmission path is planned to avoid the side wall of the seat from generating resistance to the belt when it enters and exits the drive mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the traction system used for testing the driving assistance system of the utility model;

[0028] Figure 2 This is a three-dimensional diagram of the driving mechanism for testing the driver assistance system of the utility model;

[0029] Figure 3 This is a bottom view of the driving mechanism for testing the driver assistance system of the utility model;

[0030] Figure 4 It is a schematic diagram of the tensioning mechanism in the utility model;

[0031] Figure 5 It is a schematic diagram of the guide wheel assembly in the utility model.

[0032] Among them: 1-driving mechanism, 2-tray, 3-traction end, 4-belt, 5-machine base, 6-driving wheel, 7-tensioning mechanism, 701-rear support of guide shaft, 702-guide shaft, 703-front support of guide shaft, 704-adjusting handle, 705-adjusting nut, 706-adjusting support, 707-adjusting screw, 708-tensioning spring, 709-screw end support, 710-tensioning wheel support, 711-tensioning wheel, 712-auxiliary spring, 8-driven wheel, 9-auxiliary wheel, 10-rib, 11-guide wheel assembly, 1101-roller, 1102-rolling bearing, 1103-upper support, 1104-lower support, 12-reversing assembly, 1201-guide wheel, 1202-guide wheel shaft. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] The terms such as up, down, left, right, front and back in this application document are based on the positional relationships shown in the drawings. If the drawings are different, the corresponding positional relationships may also change accordingly, so they cannot be understood as limiting the scope of protection.

[0035] In the present utility model, the terms "install", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or mutual communication, a direct connection, an indirect connection through an intermediate medium, the internal connection of two components, or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] This embodiment describes a driving mechanism and a traction system for testing a driving assistance system, which reduces the risk of a vehicle tripping over a belt and has high safety.

[0037] like Figure 1 As shown, the traction system includes a driving mechanism 1, a tray 2, a traction terminal 3 and a belt 4. The belt 4 is an endless belt, and its two ends are respectively installed on the driving mechanism 1 and the traction terminal 3. The driving mechanism 1 is the active end of the driving belt 4, and the traction terminal 3 is the passive end. The tray 2 is installed on the belt 4 between the driving mechanism 1 and the traction terminal 3. Under the traction of the driving mechanism 1, the belt 4 drives the tray 2 to move linearly along the transmission direction of the belt 4. The tray 2 is the carrier of the target object in the AEB test. The traction system drives the target object to move according to the test requirements and cooperates to complete the test.

[0038] The driving mechanism 1 of this embodiment is as follows Figure 2 and Figure 3 As shown, it includes a machine base 5, a driving wheel 6, a tensioning mechanism 7, a driven wheel 8, an auxiliary wheel 9, a rib 10, a guide wheel assembly 11, and a reversing assembly 12.

[0039] The driving mechanism 1 is integrated at the bottom of the electrical box through the base 5, the tensioning mechanism 7 is installed in the middle of the base 5 along the axial direction of the base 5, and the driving wheel 6 and the driven wheel 8 are symmetrically installed on the bottom surface of the base 5 on both sides of the tensioning mechanism 7. The driving motor is installed in the electrical box, and the output shaft of the driving motor passes through the base 5 and is connected to the driving wheel 6 to provide rotational power for the driving wheel 6.

[0040] The tensioning mechanism 7 adjusts the position of the tensioning wheel through the adjustment structure, thereby adjusting the tension of the belt 4. Figure 4 As shown, the tensioning mechanism 7 of this embodiment includes a guide shaft rear support 701, a guide shaft 702, a guide shaft front support 703, an adjustment handle 704, an adjustment nut 705, an adjustment support 706, an adjustment screw rod 707, a tensioning spring 708, a screw rod end support 709, a tensioning wheel support 710, a tensioning wheel 711 and an auxiliary spring 712.

[0041] Among them, the front guide shaft support 703 and the rear guide shaft support 701 are fixedly installed on the bottom surface of the base 5 on the inner sides of the front and rear side walls of the base 5, and the two guide shafts 702 are installed in parallel, and their two ends are fixedly connected to the rear guide shaft support 701 and the front guide shaft support 703 respectively.

[0042] The two ends of the adjustment support 706 and the tension wheel support 710 are respectively sleeved on the two guide shafts 702 through linear bushings, and can slide axially along the guide shaft 702, and the adjustment support 706 is close to the rear support 701 of the guide shaft, and the tension wheel support 710 is located in the middle of the guide shaft 702. Two tensioning springs 708 are respectively sleeved on the two guide shafts 702 between the adjustment support 706 and the tension wheel support 710, and two auxiliary springs 712 are respectively sleeved on the two guide shafts 702 between the tension wheel support 710 and the front support 703 of the guide shaft. The adjustment nut 705 and the tension wheel 711 are respectively installed on the adjustment support 706 and the tension wheel support 710.

[0043] The screw end support 709 is installed on the bottom surface of the machine base 5 between the adjustment support 706 and the tension wheel support 710. In the middle of the two guide shafts 702, one end of the adjustment screw 707 is connected to the adjustment nut 705 threaded pair, connected to the guide shaft rear support 701 through the bearing bush rotation pair, and passes through the rear side wall of the machine base 5 and is fixedly connected to the adjustment handle 704. The other end of the adjustment screw 707 is connected to the screw end support 709 through the bearing bush rotation pair.

[0044] At the same time, the adjusting screw rod 707 has step surfaces on the inner sides of the guide shaft rear support 701 and the screw rod end support 709, so that the adjusting screw rod 707 is connected to the guide shaft rear support 701 and the screw rod end support 709 by a planar motion pair, thereby limiting the axial sliding of the adjusting screw rod 707 and avoiding the axial movement of the adjusting screw rod 707.

[0045] The tensioning mechanism 7 of this embodiment can drive the adjusting nut 705 to move linearly along the adjusting screw 707 by rotating the adjusting handle 704, and then the adjusting nut 705 drives the adjusting support 706 to slide along the guide shaft 702 between the guide shaft rear support 701 and the screw end support 709. The adjusting support 706 drives the tensioning wheel support 710 to slide along the guide shaft 702 through the tensioning spring 708, and the auxiliary spring 712 provides the tensioning wheel support 710 with a reaction force toward the guide shaft front support 703 to ensure that the tensioning wheel support 710 stops sliding when the adjusting handle 704 stops rotating. When the tensioning wheel support 710 slides, it drives the tensioning wheel 711 to move synchronously to tension the belt 4.

[0046] Two guide wheel assemblies 11 are symmetrically installed in the guide holes of the front side wall of the base 5 on both sides of the guide shaft front support 703 of the tensioning mechanism 7. Figure 5As shown, the guide wheel assembly 11 of this embodiment includes a roller 1101, a rolling bearing 1102, an upper support 1103, and a lower support 1104. The upper support 1103 is installed above the lower support 1104 to form a U-shaped roller support, and the U-shaped openings are arranged relatively, and the roller supports are symmetrically fixed on both sides of the guide hole. The upper and lower ends of the roller 1101 are respectively installed on the upper support 1103 and the lower support 1104 through the rolling bearing 1102, and the roller 1101 can rotate in the roller support. The belt 4 passes between the two rollers 1101 in a longitudinal posture, which can ensure the moving posture of the belt 4 and will not increase the moving resistance of the belt 4.

[0047] The reversing assembly 12 is installed on the outside of the machine base 5 between the two guide wheel assemblies 11, and is used to cooperate with the guide wheel assembly 11 to change the posture of the belt 4 so that the back of the belt 4 is parallel to the ground. The reversing assembly 12 of this embodiment includes two pairs of guide wheels 1201, two guide wheel shafts 1202 and a folding bracket. One end of the folding bracket is installed on the outside of the machine base 5, and the folding bracket is coaxially arranged with the tensioning mechanism 7, and can be folded upward (i.e., in the direction of the electrical box), which can reduce the storage space when not being tested. The two guide wheel shafts 1202 are respectively installed at the other end of the folding bracket in an upper and lower parallel form, and guide wheels 1201 are respectively installed at both ends of the two guide wheel shafts 1202, and the guide wheels 1201 can rotate around the guide wheel shafts 1202. When the belt 4 passes through the reversing assembly 12 in the in-and-out direction, it passes through the gap between the two guide wheels 1201 at both ends of the guide wheel shaft 1202.

[0048] In this embodiment, two groups of flanges 10 are symmetrically mounted on the bottom surface of the machine base 5 between the driving wheel 6 and the driven wheel 8 and the guide wheel assembly 11, and the belt 4 passes through the middle groove of the flange 10. The flange 10 is composed of an inclined section and a straight section. The spacing between the inclined sections of the two groups of flanges 10 gradually decreases toward the straight section direction. The straight section of the flange 10 is parallel to the guide shaft 702 so as to guide the belt 4 to enter and exit the guide wheel assembly 11 in a linear transmission direction. At the same time, the inclined section is conducive to increasing the contact area between the belt 4 and the driving wheel 6 and the driven wheel 8.

[0049] A plurality of auxiliary wheels 9 are respectively installed on the machine base 5 outside the circumference of the driving wheel 6 and the driven wheel 8 to limit the belt 4 from loosening in the circumferential direction of the driving wheel 6 and the driven wheel 8. In addition, the auxiliary wheel 9 is installed on the machine base 5 at the junction of the inclined section and the straight section of the rib 10 (i.e., the turning point of the rib 10), and is frictionally connected with the back side of the belt 4 to guide the belt 4.

[0050] The belt 4 of this embodiment has a plurality of teeth evenly distributed on the front side and a smooth back side. The outer circumferential surfaces of the driving wheel 6 and the driven wheel 8 are evenly distributed with a plurality of teeth. The belt 4 is meshed and connected with the driving wheel 6 and the driven wheel 8 respectively, and the belt 4 moves under the driving wheel 6.

[0051] In the traction system of this embodiment, the belt 4 is transmitted with its back side touching the ground on the outside of the driving mechanism 1. The belt 4 passes through the gap between the two guide wheels 1201 at one end of the reversing assembly 12 in a horizontal posture, and passes through a guide wheel assembly 11 in a longitudinal posture, and then passes through the middle groove of the side rib 10 in the base 5, bypasses the driving wheel 6, and the belt 4 is meshed and connected with the driving wheel 6 through the front. After the belt 4 turns, it passes through the tensioning wheel 711 and is frictionally connected with the tensioning wheel 711 through the back. The belt 4 transmitted by the tensioning wheel 711 turns and bypasses the driven wheel 8, and is meshed and connected with the driven wheel 8 through the front. The belt 4 passes through the middle groove of the rib 10 on the other side, extends out of the base 5 from the other guide wheel assembly 11 in a longitudinal posture, and passes through the gap between the two guide wheels 1201 at the other end of the reversing assembly 12 in a horizontal posture to extend to the traction end 3.

[0052] Although the principle of the present invention is described in detail above in conjunction with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely explanations of the exemplary implementation of the present invention, and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute limitations on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformations and simple replacements based on the technical solution of the present invention fall within the scope of protection of the present invention.

Claims

1. A driving mechanism for testing a driving assistance system, characterized in that: The driving mechanism (1) comprises a machine base (5), a driving wheel (6), a driven wheel (8), a guide wheel assembly (11), and a reversing assembly (12); the driving wheel (6) and the driven wheel (8) are symmetrically mounted on the bottom surface of the machine base (5); the machine base (5) is integrated at the bottom of an electrical box, a driving motor is mounted in the electrical box, an output shaft of the driving motor passes through the machine base (5) and is connected to the driving wheel (6), and the driving wheel (6) is driven to rotate by the driving motor; two guide holes are symmetrically arranged on one side wall of the machine base (5), and two guide wheel assemblies (11) are respectively mounted in the two guide holes; the reversing assembly (12) is mounted on the outside of the machine base (5) between the two guide wheel assemblies (11); The belt (4) passes through one end of the reversing assembly (12) in a horizontal posture, and passes through the guide wheel assembly (11) in a longitudinal posture. The belt (4) then meshes with the driving wheel (6) and the driven wheel (8) in sequence for transmission connection, passes through another guide wheel assembly (11) in a longitudinal posture, and then passes out from the other end of the reversing assembly (12) in a horizontal posture.

2. The driving mechanism for testing a driving assistance system according to claim 1, characterized in that: The driving mechanism (1) further comprises a tensioning mechanism (7); the tensioning mechanism (7) comprises an adjusting structure and a tensioning wheel (711); the tensioning wheel (711) is installed on the adjusting structure between the driving wheel (6) and the driven wheel (8), and the belt (4) passes around the driving wheel (6), the tensioning wheel (711), and the driven wheel (8) in sequence; the tensioning wheel (711) moves under the drive of the adjusting structure to adjust the tension of the belt (4).

3. The driving mechanism for testing a driving assistance system according to claim 2, characterized in that: The adjustment structure comprises a guide shaft rear support (701), a guide shaft (702), a guide shaft front support (703), an adjustment handle (704), an adjustment nut (705), an adjustment support (706), an adjustment screw (707), a tensioning spring (708), a screw end support (709), a tension wheel support (710) and an auxiliary spring (712); The two guide shafts (702) are parallel to each other, and the two ends of the guide shafts (702) are respectively mounted on the guide shaft rear support (701) and the guide shaft front support (703); the two ends of the adjustment support (706) and the tensioning wheel support (710) are respectively sleeved on the two guide shafts (702) and can slide along the guide shafts (702); the adjustment nut (705) is fixed on the adjustment support (706), and the tensioning wheel (711) is mounted in the middle of the tensioning wheel support (710); The two tensioning springs (708) are respectively sleeved on the two guide shafts (702) between the adjustment support (706) and the tensioning wheel support (710), and the two auxiliary springs (712) are respectively sleeved on the two guide shafts (702) between the tensioning wheel support (710) and the guide shaft front support (703); In the middle of the two guide shafts (702), one end of the adjusting screw rod (707) passes through the adjusting nut (705) and the guide shaft rear support (701) in sequence, and is fixedly connected to the adjusting handle (704), and the adjusting nut (705) is threadedly connected to the adjusting screw rod (707); the other end of the adjusting screw rod (707) is installed on the screw rod end support (709); The adjusting handle (704) rotates the adjusting screw (707), driving the adjusting nut (705) to move linearly along the adjusting screw (707), and the adjusting support (706) slides along the guide shaft (702) between the guide shaft rear support (701) and the screw shaft end support (709); the adjusting support (706) drives the tensioning wheel support (710) to slide along the guide shaft (702) through the tensioning spring (708).

4. The driving mechanism for testing a driving assistance system according to claim 3, characterized in that: The adjusting screw rod (707) is connected to the guide shaft rear support (701) and the screw rod end support (709) respectively through a bearing rotation pair.

5. The driving mechanism for testing a driving assistance system according to claim 3, characterized in that: The adjusting screw rod (707) has step surfaces on the inner sides of the guide shaft rear support (701) and the screw rod end support (709), respectively, and the adjusting screw rod (707) is connected to the guide shaft rear support (701) and the screw rod end support (709) through the step surfaces in a planar motion pair.

6. The driving mechanism for testing a driving assistance system according to claim 1, characterized in that: The guide wheel assembly (11) comprises a roller (1101), a rolling bearing (1102) and a roller support; the roller support is a U-shaped roller support; the U-shaped openings of the two roller supports are arranged opposite to each other, and the upper and lower ends of the roller (1101) are longitudinally mounted on the roller support via the rolling bearing (1102) respectively.

7. The driving mechanism for testing a driving assistance system according to claim 1, characterized in that: The reversing assembly (12) comprises two pairs of guide wheels (1201) and two guide wheel shafts (1202); the two guide wheel shafts (1202) are arranged in parallel up and down, the guide wheels (1201) are respectively installed at both ends of the two guide wheel shafts (1202), and the guide wheels (1201) can rotate around the guide wheel shafts (1202).

8. The driving mechanism for testing a driving assistance system according to claim 1, characterized in that: A rib (10) is provided between the driving wheel (6), the driven wheel (8) and the guide wheel assembly (11), and the belt (4) passes through a middle groove of the rib (10).

9. The driving mechanism for testing a driving assistance system according to claim 8, characterized in that: A plurality of auxiliary wheels (9) are distributed outside the circumference of the driving wheel (6) and the driven wheel (8); the auxiliary wheels (9) are arranged outside the turning point of the retaining edge (10).

10. A traction system for testing a driving assistance system, characterized in that: The traction system comprises a driving mechanism (1), a tray (2), a traction end (3) and a belt (4) according to any one of claims 1 to 9; The belt (4) is an endless belt; the two ends of the belt (4) are respectively mounted on the driving mechanism (1) and the traction end (3); the tray (2) is mounted on the belt (4) between the driving mechanism (1) and the traction end (3); the driving mechanism (1) pulls the belt (4) to drive the tray (2) to move linearly along the transmission direction of the belt (4); the target object to be tested is mounted on the tray (2) and moves together with the tray (2).

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