Drive assembly and mobile carrier

Abstract

The utility model discloses drive assembly and mobile carrier. Drive assembly includes installation support, driver, wheel and elastic part. Installation support is equipped with two vertical board, and driver is located between and is connected with rotation, and the central axis is parallel with the rotation axis and does not coincide. Wheel is directly connected driver, and elastic part connects installation support and driver. When wheel is increased under pressure, driver positive overturn makes wheel go up, and elastic part stores energy, and when pressure is reduced, elastic part releases energy, and driver reverse overturn makes wheel go down. The transmission mechanism is saved, and the structure is simplified, and cost is reduced, and energy consumption is reduced. Cooperation elastic part realizes bearing, and anti-rolling pressure retraction and reset. Mobile carrier includes the casing and at least three above-mentioned drive assemblies, and the lower part of casing is equipped with the accommodation cavity. Drive assembly is not arranged along the straight line, and is supported stably. When rolling, wheel retracts to the chamber, and the bottom surface of casing is attached to the ground and bears pressure, avoiding the damage of core components, and after rolling, elastic part resets, and wheel jacks up the casing, ensuring normal driving.

Description

Technical Field

[0001] This utility model mainly relates to the field of vehicle testing technology, and in particular to drive components and mobile vehicles. Background Technology

[0002] When testing a vehicle's target recognition function, the model used to simulate obstacles that may appear on the road is called the target object. It is usually made of foam-like materials and does not have the ability to move on the ground. In order to more realistically simulate the dynamic process of obstacles, the target object needs to be placed on a moving vehicle, and the moving vehicle is used to drive the target object to move according to the design plan.

[0003] To meet radar reflection requirements, mobile vehicles are typically designed with a flat shape. This flat structure is susceptible to being run over by test vehicles during testing. However, the design load-bearing capacity of mobile vehicles is often much lower than that of the test vehicles. Therefore, to ensure the safety of mobile vehicles, they are usually equipped with a high-load-bearing shell, and the wheels retract into the shell when run over by a vehicle, thus preventing damage to the drive components.

[0004] In existing technologies (such as the technical solution disclosed in Chinese Patent Application No. 202011160511.1, "Small Active Drive Platform for Loading Dummy Targets"), the drive unit's actuator (e.g., a motor) is usually fixedly connected to the frame, while the wheels have the ability to float up and down. To achieve the connection between the fixed actuator and the moving wheels, a transmission mechanism (e.g., gears, timing belts, chains, or lever arms) is usually required between them. However, the installation of a transmission mechanism complicates the structure of the mobile vehicle, thereby increasing the difficulty and cost of manufacturing and maintenance; at the same time, the presence of the transmission mechanism also reduces the transmission efficiency of the actuator, causes transmission energy loss, and negatively affects the device's maximum speed and range.

[0005] Therefore, it is necessary to optimize the structure of the drive components and the mobile vehicle. Utility Model Content

[0006] The technical problem to be solved by this utility model is how to achieve a direct connection between the wheel and the drive unit while retaining the wheel retraction function, thereby eliminating the transmission mechanism in the existing technical solution.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] The drive assembly includes a mounting bracket, a driver, wheels, and an elastic element. The mounting bracket has a set of upright plates positioned opposite each other. The driver is located between the two upright plates and rotatably connected to them. The central axis of the driver is parallel to but does not coincide with the axis of rotation. The wheels are directly connected to the driver. One end of the elastic element is connected to the mounting bracket, and the other end is connected to the driver. When the pressure on the wheel increases, the driver rotates forward around the axis of rotation, and the wheel moves upward relative to the mounting bracket, at which point the elastic element accumulates elastic potential energy. When the pressure on the wheel decreases, the elastic element releases its elastic potential energy, and the driver rotates in the opposite direction around the axis of rotation, and the wheel moves downward relative to the mounting bracket. Firstly, the direct connection between the wheels and the driver eliminates the need for the transmission mechanism used in existing technologies to connect the fixed driver and the movable wheels. This effectively solves the problems of structural complexity, manufacturing and maintenance difficulties, and high costs caused by transmission mechanisms in existing technologies, simplifying the overall structure of the drive assembly and reducing manufacturing difficulty and subsequent maintenance costs. Secondly, the absence of a transmission mechanism avoids energy loss during transmission, significantly improving the transmission efficiency of the driver, thereby improving the maximum speed and range of the mobile vehicle and resolving the negative impact of transmission energy loss on equipment performance in existing technologies. Simultaneously, the actuator is rotatably connected to the upright plate. Combined with the elasticity of the elastic element, this ensures that: ① When the mobile vehicle is not run over by the test vehicle, the elastic element supports the drive unit between the mounting bracket and the actuator, providing a certain degree of support stiffness, thus enabling the drive assembly to bear weight; ② When the mobile vehicle is run over by the test vehicle, the pressure on the wheels increases, and the direction of the pressure does not intersect with the axis of rotation, causing the drive unit to rotate in the forward direction around the axis of rotation (at this time, the wheels move upwards, and the elastic element accumulates elastic potential energy), thus achieving a retraction function, preventing damage to the drive assembly, and meeting the safety requirements of the mobile vehicle to resist being run over; ③ After the test vehicle runs over it, the elastic potential energy of the elastic element is released, pushing the drive unit to rotate in the reverse direction around the axis of rotation (at this time, the wheels move downwards), achieving a reset. The elastic element supports the drive unit between the mounting bracket and the actuator, providing a certain degree of support stiffness, thus enabling the drive assembly to regain its load-bearing capacity.

[0009] The mounting bracket is constructed from a first upright plate, a second upright plate, and a base plate connected to both, forming a U-shaped structure with an opening on one side. The driver and the elastic element are housed within the U-shaped structure and arranged side-by-side along the length of the base plate. The lateral opening design of the mounting bracket, combined with the lateral arrangement of the driver and the elastic element, maximizes the use of lateral space, replacing the traditional longitudinal stacking layout, thereby compressing the longitudinal height of the drive assembly and achieving optimized flattened layout. This design can adapt to the flattened design requirements of mobile vehicles, avoiding an increase in the overall thickness of the mobile vehicle due to excessive height of the drive assembly structure, which would affect the compliance of radar reflection characteristics.

[0010] The drive unit includes a main body, the output shaft of which passes through a first upright plate. A clearance space is formed on the first upright plate, the shape of which is adapted to the movement path of the output shaft. During the rotation of the drive unit around its axis of rotation, its output shaft moves along an arc-shaped trajectory. By creating a clearance space on the first upright plate that matches this movement trajectory, interference can be avoided without increasing the height of the first upright plate or the overall size of the drive assembly. This allows for wheel retraction while maintaining the compactness of the drive assembly in the height direction. This design avoids the additional height space required due to the output shaft's oscillation, strongly supporting the flattened overall layout of the mobile vehicle.

[0011] The elastic element is inclined; the angle between the extension / retraction direction of the elastic element and the central axis is acute. The inclined design of the elastic element significantly reduces its longitudinal height, avoiding the increase in the longitudinal dimension of the drive assembly due to excessive height of a vertically installed elastic element. This ensures that the overall thickness of the mobile vehicle meets the requirements of a flat design and adapts to radar reflection characteristics. The inclined design of the elastic element reduces the longitudinal dimension of the drive assembly, ensuring that the overall thickness of the mobile vehicle meets the requirements of a flat design.

[0012] The driver has connecting seats fixed at both ends, and the side of the connecting seat facing away from the driver is rotatably connected to the upright plate. By providing independent connecting seats at both ends, the driver achieves a rotatable connection with the upright plate, avoiding the need to directly machine complex rotatable connection structures onto the driver itself, thus reducing manufacturing costs and complexity. Furthermore, the connecting seats serve as standardized interface components, allowing the driver to adapt to different sizes of mounting brackets, improving its versatility.

[0013] The elastic element and the mounting bracket, as well as the elastic element and the actuator, are connected by ball joints. These ball joints provide multi-directional rotational freedom. When the actuator rotates around its axis, the connection points at both ends of the elastic element experience relative displacement and angular changes. The ball joints can adaptively adjust the connection angle, avoiding additional bending stress at both ends of the elastic element and ensuring that the elastic element always bears only tensile and compressive forces along its axial direction. This significantly improves the fatigue life and operational stability of the elastic element, preventing premature failure under complex stress conditions.

[0014] A set of opposing mounting seats are formed on the mounting bracket and the driver, and the two ends of the elastic element are respectively connected to the two mounting seats by ball joints. The setting of the mounting seats provides a stable mounting carrier for the ball joint connection of the elastic element, ensuring a more secure connection between the elastic element and the mounting bracket and driver, avoiding problems such as detachment or loosening of the elastic element during extension, contraction and rotation, and improving the operational reliability of the drive assembly. The set of opposing mounting seats can accurately position the installation position of the elastic element, ensuring that the tilt angle and force direction of the elastic element meet the design requirements, so that the accumulation and release of elastic potential energy of the elastic element is precisely matched with the flipping action of the driver, further optimizing the operating performance of the drive assembly.

[0015] The elastic element and the rotation axis are positioned on opposite sides of the central axis. This structural arrangement allows the elastic force exerted by the elastic element on the actuator to form a long lever arm with the rotation axis. When the pressure on the wheel increases, the actuator can smoothly rotate forward around the rotation axis, while the elastic element steadily accumulates elastic potential energy. When the pressure on the wheel decreases, the elastic potential energy released by the elastic element can act on the actuator through the lever arm, driving it to rotate backward around the rotation axis, thus achieving smooth wheel retraction and ensuring efficient and reliable wheel retraction and retraction.

[0016] The mobile vehicle includes a housing and at least three drive components connected thereto, as described above. A chamber for accommodating the drive components is formed in the lower part of the housing. The mounting brackets of the drive components are connected to the housing. When the downward pressure on the housing increases, the wheels can retract into the housing, at which point the bottom surface of the housing is in contact with the ground. When the downward pressure on the housing decreases, the drive components can lift the housing so that the bottom surface of the housing is suspended in the air.

[0017] The drive assembly of the mobile vehicle is not arranged in a straight line, which provides stable support for the mobile vehicle, ensuring smooth operation during testing and preventing tipping. The chamber at the bottom of the housing provides ample space for the retraction of the drive assembly. When the mobile vehicle is run over by a test vehicle, the drive assembly can retract smoothly into the chamber, allowing the housing to fit against the ground and bear the crushing pressure, thus preventing damage to the drive assembly. When the crushing pressure disappears and the pressure on the wheels decreases, the drive unit can reset under the action of the elastic element and use the wheels to lift the housing, suspending it in the air, ensuring that the mobile vehicle can move normally.

[0018] The mobile vehicle also includes at least one steering component, one side of which is fixed to the housing and the other side is connected to the drive component. The steering component enables the mobile vehicle to steer, allowing it to move along the path designed in the test plan, more realistically simulating the dynamic movement of road obstacles and improving the realism and accuracy of vehicle target recognition testing. The steering component does not affect the retraction and reset functions of the drive component; the two work together to ensure the mobile vehicle's resistance to crushing and to achieve flexible steering, further optimizing the test adaptability of the mobile vehicle. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the driving component shown in an embodiment of this application;

[0020] Figure 2 This is an exploded view of the driving component shown in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the mounting bracket structure shown in the embodiments of this application;

[0022] Figure 4 This is a schematic diagram of the driver structure shown in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the structure of the elastic element shown in the embodiments of this application;

[0024] Figure 6 This is an exploded schematic diagram of the casing shown in an embodiment of this application (the number of chambers is four);

[0025] Figure 7 This is a schematic diagram of the structure of a mobile vehicle shown in an embodiment of this application (the number of chambers and drive components is four).

[0026] The labels in the diagram represent:

[0027] 1. Mounting bracket; 11. Vertical plate; 11-1. First vertical plate; 11-2. Second vertical plate; 111. Clearance space; 112. Hinge hole; 12. Base plate;

[0028] 2. Driver; 21. Body; 211. Output shaft; 22. Connecting seat; 221. Hinge shaft;

[0029] 3. Wheels;

[0030] 4. Elastic element; 41. Ball joint;

[0031] 5a. First mounting base; 51a. First ball joint seat; 5b. Second mounting base; 51b. Second ball joint seat;

[0032] 6. Housing; 61. Middle housing; 62. Side housing; 621. Chamber; 63. Stiffening plate;

[0033] 7. Driver components;

[0034] 8. Steering components;

[0035] La, central axis; Lb, axis of rotation. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] This embodiment is one structural form of the driving component.

[0039] like Figures 1 to 5 As shown, in this embodiment, the drive assembly includes a mounting bracket 1, a driver 2, a wheel 3, and an elastic element 4. Specifically:

[0040] The mounting bracket 1 is configured as a horizontally open U-shaped structure, comprising a set of opposing upright plates 11 and base plates 12 respectively connected to the two. The upright plates 11 include a first upright plate 11-1 and a second upright plate 11-2. The base plate 12 is integrally formed with the first upright plate 11-1 and bolted to the second upright plate 11-2. The base plate 12 has several connecting holes, allowing the mounting bracket 1 to be fixed to an external structure. The U-shaped mounting bracket 1 forms a semi-enclosed accommodating space, within which a driver 2 and an elastic element 4 are arranged horizontally, wherein the elastic element 4 is located between the base plate 12 and the driver 2.

[0041] More specifically, a first mounting seat 5a is integrally formed on the second vertical plate 11-2, which is bolted to the base plate 12. The first mounting seat 5a is attached to the side of the base plate 12 facing the driver 2, and a first ball joint seat 51a is formed on its end face facing the first vertical plate 11-1.

[0042] More specifically, an avoidance space 111 is formed on the first vertical plate 11-1 integrally formed with the substrate 12. The avoidance space 111 is set as a U-shaped groove with a downward opening. The shape of the avoidance space 111 is adapted to the movement path of the output shaft 211, so as to avoid spatial interference between the output shaft 211 and the first vertical plate 11-1 during the flipping process of the driver 2.

[0043] More specifically, a hinge hole 112 is formed on each of the two upright plates 11, and the central axes La of the two hinge holes 112 coincide.

[0044] The driver 2 includes a body 21 and a pair of connectors 22, which are fixed to both ends of the body 21 respectively.

[0045] More specifically, the main body 21 is a motor (in other embodiments, the main body 21 may also be other types of drive devices), and one end of it is provided with an output shaft 211, which passes through the clearance space 111.

[0046] More specifically, the connecting seat 22 is configured as a plate-like structure, with one side fixed to the body 21 and the other side forming a hinge shaft 221, which is rotatably inserted into the hinge hole 112.

[0047] More specifically, a second mounting seat 5b is integrally formed on the connecting seat 22 near the side of the first upright plate 11-1 which is integrally formed with the substrate 12. The second mounting seat 5b is attached to the side of the driver 2 facing the substrate 12, and a second ball joint seat 51b is formed on its end face facing the second upright plate 11-2.

[0048] More specifically, the central axis La of the driver 2 is parallel to but does not coincide with the rotation axis Lb (i.e., the central axis of the hinge hole 112).

[0049] The wheel 3 is directly and fixedly connected to the output shaft 211 of the driver 2, without any intermediate transmission mechanism such as gears, timing belts, or chains between them, thus achieving direct drive.

[0050] The elastic element 4 is configured as a straight structure, with a guide sleeve formed in the middle, and a spring is fitted on the outside of the guide sleeve. Ball joint heads 41 are formed at both ends of the elastic element 4. One ball joint head 41 is installed in conjunction with the first ball joint seat 51a on the second vertical plate 11-2, and the other ball joint head 41 is installed in conjunction with the second ball joint seat 51b on the second mounting base 5b.

[0051] More specifically, the elastic element 4 and the rotation axis Lb are located on either side of the central axis La.

[0052] More specifically, the elastic element 4 is inclined, with one end higher than the other; the extension and retraction direction of the elastic element 4 forms an acute angle with the central axis La. When the pressure on the wheel 3 increases, the driver 2 rotates in the forward direction around the rotation axis Lb, and the wheel 3 moves upward relative to the mounting bracket 1. At this time, the elastic element 4 is compressed (in other embodiments, the elastic element 4 can also be extended), accumulating elastic potential energy; when the pressure decreases, the elastic element 4 returns to its original length and releases elastic potential energy. At this time, the driver 2 rotates in the reverse direction around the rotation axis Lb, and the wheel 3 moves downward relative to the mounting bracket 1.

[0053] More specifically, the elastic element 4 includes a first spring and a second spring connected in series along the extension direction. The two springs have different stiffnesses. One serves as an outer buffer layer, directly bearing the impact force and absorbing the initial energy through pre-stretching or elastic deformation, reducing the load transmitted to the internal structure. The other provides a second buffer layer, further dispersing and absorbing the remaining energy, reducing the impact on critical components. In other embodiments, the first spring and the second spring can also be arranged in parallel.

[0054] Example 2

[0055] This embodiment is a structural form of a mobile vehicle.

[0056] like Figure 6 and Figure 7 As shown, in this embodiment, the mobile vehicle includes a housing 6 and a drive assembly 7 as in Embodiment 1. Specifically:

[0057] The housing 6 is configured as a flat housing with an opening at the lower end, which includes a central housing 61 and a pair of side housings 62, which are detachably connected.

[0058] More specifically, stiffening plates 63 are formed on the edge of the middle shell 61 facing the side shell 62, and on the edge of the side shell 62 facing the middle shell 61. Adjacent stiffening plates 63 are connected by bolts so that the middle shell 61 and the side shell 62 are integrated into a whole.

[0059] More specifically, the lower part of the side housing 62 has a chamber 621 for accommodating the drive assembly 7. After the drive assembly 7 is installed in place, the bottom surface of its mounting bracket 1 is not lower than the bottom surface of the side housing 62. When the downward pressure on the housing 6 increases, the driver 2 rotates in the forward direction around the rotation axis Lb, and the wheel 3 moves upward relative to the mounting bracket 1, so that the drive assembly 7 can be completely retracted into the chamber 621. At this time, the bottom surface of the side housing 62 is in contact with the ground. When the downward pressure on the housing 6 decreases, the elastic element 4 returns to its original length and releases elastic potential energy. At this time, the driver 2 rotates in the reverse direction around the rotation axis Lb, and the wheel 3 moves downward relative to the mounting bracket 1. At this time, the drive assembly 7 can lift the housing 6 so that it is suspended in the air.

[0060] There are four drive components 7. Two of the drive components 7 are fixedly connected to the mounting brackets 1 of one side stiffening plate 63 of the central housing 61. The other two drive components 7 are located on the opposite side of the central housing 61, and are connected to the central housing 61 via a steering component 8. (In other embodiments, the number and arrangement of the drive components 7 can be adjusted according to actual needs and are not considered limiting conditions; for example, when there are three drive components 7, two of the drive components 7 are fixedly connected to the mounting brackets 1 of one side stiffening plate 63 of the central housing 61, and the other drive component 7 is located on the opposite side of the central housing 61, connected to the central housing 61 via a steering component 8. The three drive components 7 are distributed at the three vertices of an equilateral triangle, and are adapted to it using…) The number of chambers 621 for accommodating the drive assembly 7 is also set to three, with one chamber 621 formed on one side housing 62 and two chambers 621 formed on the other side housing 62. The three chambers 621 are distributed at the three vertices of an equilateral triangle. For example, when the number of drive assemblies 7 is six, the mounting brackets 1 of three drive assemblies 7 are fixedly connected to the stiffening plate 63 on one side of the middle housing 61, and the other three drive assemblies 7 are located on the opposite side of the middle housing 61. The three drive assemblies 7 are respectively connected to the middle housing 61 via a steering assembly 8, and the number of chambers 621 for accommodating the drive assembly 7 is also set to six, with three chambers 621 formed on one side housing 62 and three chambers 621 formed on the other side housing 62.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A driving component, characterized in that, include: Mounting bracket (1) includes a set of upright plates (11) arranged opposite to each other; A driver (2) is located between two upright plates (11) and rotatably connected to them; the central axis (La) of the driver (2) is parallel to but does not coincide with the axis of rotation (Lb); The wheel (3) is directly connected to the drive (2); The elastic element (4) is connected at one end to the mounting bracket (1) and at the other end to the driver (2). When the pressure on the wheel (3) increases, the driver (2) rotates in the forward direction around the rotation axis (Lb), and the wheel (3) moves upward and closer to the mounting bracket (1). At this time, the elastic element (4) accumulates elastic potential energy. When the pressure on the wheel (3) decreases, the elastic element (4) releases elastic potential energy. At this time, the driver (2) rotates in the reverse direction around the rotation axis (Lb), and the wheel (3) moves downward and away from the mounting bracket (1).

2. The driving component according to claim 1, characterized in that: The mounting bracket (1) is constructed into a U-shaped structure with one side opening by a first upright plate (11-1), a second upright plate (11-2) arranged opposite to each other and a base plate (12) connected to both respectively; the driver (2) and the elastic element (4) are accommodated in the U-shaped structure and are arranged side by side along the length direction perpendicular to the base plate (12).

3. The driving component according to claim 2, characterized in that: The output shaft (211) of the driver (2) passes through the first upright plate (11-1), and a clearance space (111) is formed on the first upright plate (11-1). The shape of the clearance space (111) is adapted to the movement path of the output shaft (211).

4. The driving component according to claim 1, characterized in that: The elastic element (4) is inclined; the angle between the extension and retraction direction of the elastic element (4) and the central axis (La) is acute.

5. The driving component according to claim 1, characterized in that: The driver (2) has a connecting seat (22) fixed at both ends. The side of the connecting seat (22) facing away from the driver (2) is rotatably connected to the upright plate (11).

6. The driving component according to claim 1, characterized in that: The elastic element (4) and the mounting bracket (1) are connected by ball joints, as are the elastic element (4) and the driver (2).

7. The driving component according to claim 6, characterized in that: A set of oppositely arranged mounting seats are formed on the mounting bracket (1) and the driver (2), and the two ends of the elastic member (4) are respectively ball-jointed to the two mounting seats.

8. The driving component according to claim 1, characterized in that: The elastic element (4) and the rotation axis (Lb) are located on both sides of the central axis (La).

9. A mobile vehicle, characterized in that: Includes a housing (6) and at least three drive assemblies (7) of any one of claims 1-8 connected to the housing (6). The lower part of the housing (6) has a chamber (621) for accommodating the drive assembly (7). The mounting bracket (1) of the drive assembly (7) is connected to the housing (6). When the downward pressure on the housing (6) increases, the wheel (3) can retract into the housing (6), at which time the bottom surface of the housing (6) is in contact with the ground. When the downward pressure on the housing (6) decreases, the wheel (3) can lift the housing (6) so that the bottom surface of the housing (6) is suspended.

10. The mobile vehicle according to claim 9, characterized in that: It also includes at least one steering component (8), one side of which is fixed to the housing (6) and the other side is connected to the drive component (7).

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