A hinge for automobile scissor door

Abstract

The present invention provides a hinge for a scissor door of an automobile, belonging to the technical field of automobile body hinges, and comprising: a first universal connection device; an articulated bracket provided with a first guide bracket, the first guide bracket being curved and provided with a first guide groove in the shape of a curved arc; a door panel connection mechanism provided with a first guide pin, the door panel connection mechanism being movably hinged to the articulated bracket via the first universal connection device, the first guide pin being connected to the first guide groove and movable along the first guide groove, thereby allowing the first guide bracket to guide the door panel connection mechanism to move along a curved arc trajectory. The beneficial effects of the present invention are: the automobile hinge operates very smoothly during use, and the door can rotate toward the inside of the vehicle body after opening, thereby reducing the space occupied after opening.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle body hinges and relates to a hinge for a scissor door of an automobile. Background Art

[0002] Scissor doors, also known as scissor-type car doors, can be opened by rotating. Functionally speaking, the scissor doors open upward and forward, which not only makes entry and exit convenient, but also requires less external space. The design of the scissor doors is not only more attractive in appearance, but also solves the problem of insufficient space for opening the door when parking spaces are tight.

[0003] The scissor door needs to be connected to the car body through a special hinge to achieve the effect of rotating to open. At present, there are some car body hinges specifically used for car scissor doors. For example, an invention patent with application number CN202010462383.X discloses a car scissor door hinge, including a car body side hinge, a first rotating shaft, a rotating head, a second rotating shaft, a door side hinge and a limit pin; the rotating head is hinged to the car body side hinge through the first rotating shaft, and the door side hinge is hinged to the rotating head through the second rotating shaft. The limit pin is slidingly connected to the rotating head. The limit pin includes a rack and a limit shaft. The door side hinge is provided with a transmission tooth, and the transmission tooth is engaged with the rack. A limit hole is provided on the car body side hinge, and the limit shaft passes through the rotating head and adapts to the limit hole.

[0004] The above-mentioned scissor door hinge can meet the needs of scissor doors. The scissor door can only rotate up and down after it is opened to a certain angle, avoiding the door from moving up and down before the set opening angle is reached, causing interference between the door and the body; however, this body hinge does not have the effect of further contraction after the door is opened, and will still occupy a relatively large space after opening. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a hinge for a scissor door of an automobile.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A hinge for a scissor door of an automobile, comprising:

[0007] a first universal connection device;

[0008] The hinged bracket is provided with a first guide bracket, the first guide bracket is arranged in a curved manner, and the first guide bracket is provided with a first guide groove in a curved arc shape;

[0009] The door panel connection mechanism is provided with a first guide pin, and the door panel connection mechanism can be movably hinged to the hinge bracket through the first universal connection device. The first guide pin is connected to the first guide groove and can move along the first guide groove, so that the first guide bracket guides the door panel connection mechanism to move along a curved arc trajectory.

[0010] Preferably, the articulated bracket is used for fixed connection with the vehicle body, and the door panel connection mechanism can be rotated in any direction through the first universal connection device.

[0011] Preferably, the door panel connecting mechanism includes a door panel fixing seat and a movable connecting seat, the movable connecting seat is movably connected to the hinged bracket through the first universal connecting device, the door panel connecting seat is rotatably hinged to the movable connecting seat, and the first guide pin is arranged on the door panel fixing seat and can guide the door panel fixing seat to move along a curved arc trajectory.

[0012] Preferably, the articulated bracket is provided with a limiting notch, and the movable connecting seat can be laterally movably arranged in the limiting notch through the first universal connection device, and the upper and lower ends of the limiting notch are respectively abutted and connected with the upper and lower ends of the movable connecting seat to limit the up and down movement of the movable connecting seat, and the door panel fixing seat can be hinged to the movable connecting seat so as to rotate up and down.

[0013] Preferably, the first universal connection device includes a first connecting ball head and a first ball head seat, the first connecting ball head is connected to the door panel connection mechanism, the first ball head seat is connected to the hinged bracket, and the first connecting ball head can be connected to the first ball head seat rotatably in any direction.

[0014] Preferably, the door panel fixing seat is provided with a rotating shaft, and the door panel fixing seat is rotatably hinged to the movable connecting seat through the rotating shaft, the rotating shaft is provided with a first limiting gear fixed relative to the door panel fixing seat, and the movable connecting seat is provided with a second limiting gear, the first limiting gear is engaged with the second limiting gear and can limit the rotation stroke of the door panel fixing seat.

[0015] Preferably, the movable connecting seat is provided with a motor, and the motor is linked to the second limiting gear and can drive the second limiting gear to rotate.

[0016] Preferably, it further comprises a vehicle body fixing seat and a second universal connection device, and the articulated bracket is connected to the vehicle body fixing seat so as to be rotatable in any direction via the second universal connection device.

[0017] Preferably, the hinged bracket is provided with a second guide pin, the vehicle body fixing seat is provided with a second guide bracket, the second guide bracket is provided with a second guide groove for guiding the vehicle door to open outward, and the second guide pin is connected to the second guide groove and can move along the second guide groove.

[0018] Preferably, the second universal connection device includes a second connecting ball head and a second ball head seat, the second connecting ball head is connected to the vehicle body fixing seat, the second ball head seat is connected to the articulated bracket, and the second connecting ball head can be connected to the second ball head seat rotatably in any direction.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This type of car hinge moves very smoothly when in use, and the door can rotate toward the inside of the car body after opening, so it can reduce the space occupied after opening.

[0021] 2. The articulated bracket is used as a fixing seat directly fixed to the vehicle body, and the door panel connection mechanism can directly realize rotation in two or more directions through the first universal connection device.

[0022] 3. The door panel connection mechanism includes a door panel fixing seat and a movable connection seat. The movable connection seat can only swing laterally around the first universal connection device, while the door panel fixing seat can rotate up and down on the movable connection seat. When the two are combined, the door panel fixing seat can move both laterally and up and down.

[0023] 4. The door panel fixing seat and the movable connecting seat are cleverly combined to achieve free movement in two directions, and can also ensure the smooth and stable movement of the hinge, so that the hinge has a limiting effect; the lateral movement of the movable connecting seat is achieved through the ball head structure, which avoids the movable connecting seat from easily separating from the articulated bracket and making the hinge more secure.

[0024] 5. Since the first limit gear is meshed with the second limit gear, the two are linked together. When the second limit gear rotates, the first limit gear and the door panel fixing seat can be rotated. When the second limit gear is locked, the first limit gear can be locked, thereby limiting the rotation of the door panel fixing seat, so that the rotation stroke of the door panel fixing seat can be controlled.

[0025] 6. In addition to being able to rotate upward to open, the hinge also has the function of opening sideways. Through the second universal connection device and the second guide bracket, the hinge bracket can be opened sideways, so that the car door has two or more opening methods.

[0026] 7. Through this hinge, the car door can have a combined opening effect: 1. The car door can be opened by rotating upward and inward through the first universal connection device; 2. The car door can also be rotated outward to open; 3. After rotating upward to open, the car door is rotated outward to open, so that the car door has multiple opening methods, increases the function of the hinge, and enriches the opening methods of the car door.

[0027] 8. The movable connecting seat cooperates with the first connecting ball head to be able to move in other directions (such as up and down) on the basis of lateral movement. This can make the movable connecting seat and the door panel fixing seat more flexible, allowing the door to rotate upward to open at a larger angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the hinge in the second embodiment of the present invention.

[0029] Figure 2 This is a structural diagram of the hinge in the second embodiment of the present invention from another perspective.

[0030] Figure 3 This is a structural exploded view of the hinge in the second embodiment of the present invention.

[0031] Figure 4 It is a top view of the hinge of the present invention.

[0032] Figure 5 It is a structural schematic diagram of the first guide bracket of the present invention.

[0033] Figure 6 Schematic diagram of the structure of the hinge in embodiment 1 of the present invention.

[0034] Figure 7A This is a schematic diagram of the effect of the hinge of the present invention causing the vehicle door to rotate upward, open, and turn inward.

[0035] Figure 7B This is a schematic diagram of the effect of the hinge of the present invention causing the vehicle door to rotate open and then open outward.

[0036] Figure 8A This is a top view of a vehicle door after the hinge of the present invention is rotated upward to open and then rotated inward.

[0037] Figure 8B The hinge of the present invention is a top view of a vehicle door that is opened and rotated outward.

[0038] In the figure, 100, the first universal joint; 110, the first connecting ball; 120, the first ball seat; 200, the articulated bracket; 210, the first guide bracket; 220, the first guide groove; 230, the second guide pin; 240, the limiting notch; 300, the door panel connecting mechanism; 310, the first guide pin; 320, the door panel fixing seat; 321, the rotating shaft; 322, the first limiting gear; 330, the movable connecting seat; 331, the second limiting gear; 400, the vehicle body fixing seat; 410, the second guide bracket; 420, the second guide groove; 500, the second universal joint; 510, the second connecting ball; 520, the second ball seat. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0040] like Figure 1-6 As shown, a hinge for a car scissor door includes: a first universal connection device 100, an articulated bracket 200 and a door panel connection mechanism 300. The first universal connection device 100 can be set as a universal joint or a ball head structure or other structures that can support universal rotation. The articulated bracket 200 can be used as an intermediate bracket structure or can be directly connected to the car body. The door panel connection mechanism 300 is used to connect to the car door, which enables the car door to move relative to the car body.

[0041] Among them, the articulated bracket 200 is provided with a first guide bracket 210, the first guide bracket 210 is curved, and the first guide bracket 210 is provided with a first guide groove 220 in the shape of a curved arc; it should be noted that the first guide bracket 210 is bent toward the direction of the vehicle body, that is, the first guide bracket 210 (first guide groove 220) is bent inward.

[0042] The door panel connection mechanism 300 is provided with a first guide pin 310, and the door panel connection mechanism 300 is movably hinged to the hinge bracket 200 through the first universal connection device 100, so the door panel connection mechanism 300 can realize rotation in at least two directions through the first universal connection device 100, that is, the first universal connection device 100 can enable the door panel connection mechanism 300 to rotate inward when rotating upward.

[0043] The first guide pin 310 is connected to the first guide slot 220 and is movable along the first guide slot 220, thereby allowing the first guide bracket 210 to guide the door panel connection mechanism 300 to move along a curved arc. It should be noted that the first guide pin 310 is provided with a limiting structure, and the first guide bracket 210 is positioned between the limiting structures. Therefore, the door panel connection mechanism 300 can move up and down by virtue of the first guide pin 310 moving along the trajectory of the first guide slot 220. Furthermore, the first guide pin 310's limiting structure can also move the door panel connection mechanism 300 along the curved trajectory of the first guide slot 220, thereby achieving inward movement.

[0044] Existing scissor door hinges can only allow the car door to rotate upward to open or downward to close, and cannot be rotated or moved sideways, so it still takes up a relatively large space after opening.

[0045] In the present application, the multi-directional movement of the door panel connection mechanism 300 is first realized by the first universal connection device 100, and then the door panel connection mechanism 300 is guided along a curved arc trajectory by the first guide bracket 210. Therefore, after the car door is rotated upward to open, it will also move inward, that is, the car door has a contraction effect after opening, further reducing the space occupied by the car door after opening.

[0046] like Figure 1 、 Figure 4 、 Figure 5 As shown, it should be added here that, during the process of opening the vehicle door, the corresponding position on the first guide bracket 210 through which the first guide pin 310 passes becomes increasingly curved, so in the actual structure, one end of the first guide bracket 210 has a smaller curvature or no curvature, while the other end has a greater curvature, that is, the curvature from one end to the other end of the first guide bracket 210 gradually increases, so that the more the vehicle door rotates upward, the greater the angle of rotation toward the vehicle body.

[0047] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 As shown, the first universal connection device 100 includes a first connecting ball head 110 and a first ball head seat 120. The first connecting ball head 110 is connected to the door panel connection mechanism 300, and the first ball head seat 120 is connected to the hinge bracket 200. The first connecting ball head 110 can be connected to the first ball head seat 120 in a rotatable manner in any direction; the connection between the first connecting ball head 110 and the first ball head seat 120 can achieve the effect of ball head connection.

[0048] like Figure 6As shown, in embodiment 1, the articulated bracket 200 is used as a fixing seat directly fixed to the vehicle body, wherein the articulated bracket 200 is provided with a fixing portion for fixing to the vehicle body, and the door panel connection mechanism 300 can be rotated in any direction through the first universal connection device 100.

[0049] In the above embodiment, the fixing portion is configured as a threaded hole for installing screws or bolts, or other structures that can be fixed to the vehicle body. The door panel connection mechanism 300 is an integrated plate structure, which is directly connected to the first ball head seat 120 on the hinge bracket 200 through the first connecting ball head 110. This structure is relatively simple and reliable. The door panel connection mechanism 300 directly realizes rotation in two or more directions through the first universal connection device 100.

[0050] like Figure 1-3 As shown, in embodiment two, the door panel connection mechanism 300 includes a door panel fixing seat 320 and a movable connection seat 330, the movable connection seat 330 is movably connected to the hinge bracket 200 through the first universal connection device 100, the door panel connection seat is rotatably hinged to the movable connection seat 330, and the first guide pin 310 is arranged on the door panel fixing seat 320 and can guide the door panel fixing seat 320 to move along a curved arc trajectory.

[0051] The movable connecting seat 330 is movable relative to the hinged bracket 200 through the first connecting ball head 110, and the door panel fixing seat 320 can be rotated on the movable connecting seat 330, and the door panel fixing seat 320 is fixed together with the vehicle door. Since the door panel fixing seat 320 can be rotated up and down relative to the movable connecting seat 330, and the movable connecting seat 330 can realize lateral movement through the first connecting ball head 110 and the first ball head seat 120, the door panel fixing seat 320 can be rotated both up and down and laterally, so that the door panel fixing seat 320 can rotate in two or more directions.

[0052] It should be noted that, in the above embodiment, the movable connection seat 330 can be configured to move only laterally, or to move laterally and up and down.

[0053] When the movable connecting seat 330 is set to be able to move up and down within a certain range, the movable connecting seat 330 cooperates with the first connecting ball head 110 to be able to move in other directions (such as up and down) on the basis of lateral movement. This can make the movable connecting seat 330 and the door panel fixing seat 320 more flexible, allowing the car door to rotate upward to open at a larger angle.

[0054] On the basis of the above embodiment, the movable connecting seat 330 is configured to move only laterally, and the articulated bracket 200 is provided with a limiting notch 240. The movable connecting seat 330 can be laterally movably arranged in the limiting notch 240 through the first connecting ball head 110 and the first ball head seat 120. The upper and lower ends of the limiting notch 240 are respectively connected to the upper and lower ends of the movable connecting seat 330 to limit the up and down movement of the movable connecting seat 330. The door panel fixing seat 320 can be hinged to the movable connecting seat 330 so as to rotate up and down.

[0055] Among them, the movable connecting seat 330 can be just inserted into the limiting notch 240, thereby realizing the upper and lower limiting, so the movable connecting seat 330 can only move laterally, that is, the movable connecting seat 330 can only swing laterally around the first connecting ball head 110, and the door panel fixing seat 320 can rotate up and down on the movable connecting seat 330. When the two are combined, the door panel fixing seat 320 can move both laterally and up and down.

[0056] Through the above structure, the door panel fixing seat 320 and the movable connecting seat 330 are cleverly combined to achieve free movement in two directions, and can also ensure smooth and stable movement of the hinge, so that the hinge has a limiting effect; the lateral movement of the movable connecting seat 330 is achieved through the ball head structure, which avoids the movable connecting seat 330 from being easily separated and falling off from the hinge bracket 200, making the hinge more secure.

[0057] like Figure 1-3 As shown, on the basis of the above embodiment, the hinge also has the function of limiting the opening angle or opening stroke of the vehicle door, the door panel fixing seat 320 is provided with a rotating shaft 321, and the door panel fixing seat 320 is rotatably hinged to the movable connecting seat 330 through the rotating shaft 321, and the rotating shaft 321 is provided with a first limiting gear 322 fixed relative to the door panel fixing seat 320, and the movable connecting seat 330 is provided with a second limiting gear 331, and the first limiting gear 322 is meshed with the second limiting gear 331 and can limit the rotation stroke of the door panel fixing seat 320.

[0058] Since the first limiting gear 322 is engaged with the second limiting gear 331, the two are linked together. When the second limiting gear 331 rotates, the first limiting gear 322 and the door panel fixing seat 320 can rotate. When the second limiting gear 331 is locked, the first limiting gear 322 can be locked, thereby limiting the rotation of the door panel fixing seat 320, so that the rotation stroke of the door panel fixing seat 320 can be controlled.

[0059] Preferably, the movable connection seat 330 is provided with a motor (not shown in the figure), and the motor is linked to the second limiting gear 331 and can drive the second limiting gear 331 to rotate.

[0060] When the car door is opened or closed, when the door panel fixing seat 320 rotates relative to the movable connecting seat 330, the first limiting gear 322 and the second limiting gear 331 rotate. When the car door is opened, the motor rotates, thereby rotating the second limiting gear 331, and rotating the first limiting gear 322 and the door panel fixing seat 320. When the motor stops rotating, the second limiting gear 331 is locked. At this time, the second limiting gear 331 cannot rotate, and the door panel fixing seat 320 is locked through the first limiting gear 322, thereby limiting the rotation of the door panel fixing seat 320.

[0061] It should be added that a limit seat can be set on the hinged bracket 200, and a limit block can be set on the door panel fixing seat 320. When the car door is closed, the limit block is connected with the limit seat to limit the position when the car door is closed, and a plastic part can also be set on the limit block to reduce the noise when closing.

[0062] like Figure 1 、 Figure 3 As shown, the vehicle body fixing seat 400 and a second universal connection device 500 are further included. The articulated bracket 200 is connected to the vehicle body fixing seat 400 via the second universal connection device 500 so as to be rotatable in any direction.

[0063] Based on the above embodiment, the hinged bracket 200 is provided with a second guide pin 230, and the vehicle body fixing seat 400 is provided with a second guide bracket 410. The second guide bracket 410 is provided with a second guide groove 420 that can guide the vehicle door to open outward. The second guide pin 230 is connected to the second guide groove 420 and can move along the second guide groove 420.

[0064] In addition to being able to rotate upward to open, the hinge also has the function of opening sideways. By combining the second universal connection device 500 with the second guide bracket 410, the hinge bracket 200 can be opened sideways, so that the car door has two or more opening methods.

[0065] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 7A 、 Figure 7B 、 Figure 8A 、 Figure 8BAs shown, the hinge can enable the car door to have a combined opening effect, 1. The car door can be opened by rotating upward and inward through the first universal connection device 100; 2. The car door can also be rotated outward to open; 3. The car door is rotated outward to open after being rotated upward, so that the car door has multiple opening methods, increases the function of the hinge, and enriches the opening methods of the car door.

[0066] Based on the above embodiment, the second universal connection device 500 includes a second connecting ball head 510 and a second ball head seat 520. The second connecting ball head 510 is connected to the vehicle body fixing seat 400, and the second ball head seat 520 is connected to the articulated bracket 200. The second connecting ball head 510 can be connected to the second ball head seat 520 in a rotatable manner in any direction. The connection between the first connecting ball head 110 and the first ball head seat 120 can achieve the effect of ball head connection.

[0067] Optionally, the articulated bracket 200 is connected to the second ball head seat 520 on the vehicle body fixing seat 400 through the second connecting ball head 510, so when the articulated bracket 200 is rotated outward through the second connecting ball head 510, it can also move in other directions. In this way, the vehicle door can also be rotated in other directions when it is rotated outward to open, thereby avoiding interference between the vehicle door and the vehicle body when opening outward, thereby achieving an avoidance effect.

[0068] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0069] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0070] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0071] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A hinge for a car scissor door, characterized in that: include: A first universal connection device (100); The hinged bracket (200) is provided with a first guide bracket (210), the first guide bracket (210) is arranged in a curved manner, and the first guide bracket (210) is provided with a first guide groove (220) in a curved arc shape; A door panel connection mechanism (300) is provided with a first guide pin (310), the door panel connection mechanism (300) is movably hinged to the hinge bracket (200) via the first universal connection device (100), the first guide pin (310) is connected to the first guide groove (220) and can move along the first guide groove (220), so that the first guide bracket (210) guides the door panel connection mechanism (300) to move along a curved arc track; The door panel connection mechanism (300) comprises a door panel fixing seat (320) and a movable connection seat (330), wherein the movable connection seat (330) is movably connected to the hinge bracket (200) via the first universal connection device (100), the door panel fixing seat (320) is rotatably hinged to the movable connection seat (330), and the first guide pin (310) is provided on the door panel fixing seat (320) and can guide the door panel fixing seat (320) to move along a curved arc track; The hinge bracket (200) is provided with a limiting notch (240), and the movable connecting seat (330) is laterally movable in the limiting notch (240) through the first universal connecting device (100), and the upper and lower ends of the limiting notch (240) are respectively abutted against the upper and lower ends of the movable connecting seat (330) to limit the upward and downward movement of the movable connecting seat (330), and the door panel fixing seat (320) is hinged to the movable connecting seat (330) so as to rotate upward and downward; The first universal connection device (100) comprises a first connection ball head (110) and a first ball head seat (120), wherein the first connection ball head (110) is connected to the door panel connection mechanism (300), and the first ball head seat (120) is connected to the hinge bracket (200), and the first connection ball head (110) can be connected to the first ball head seat (120) in a rotatable manner in any direction.

2. A hinge for a car scissor door according to claim 1, characterized in that: The door panel fixing seat (320) is provided with a rotating shaft (321), and the door panel fixing seat (320) is rotatably hinged to the movable connecting seat (330) through the rotating shaft (321). The rotating shaft (321) is provided with a first limiting gear (322) fixed relative to the door panel fixing seat (320), and the movable connecting seat (330) is provided with a second limiting gear (331). The first limiting gear (322) and the second limiting gear (331) are engaged and can limit the rotation stroke of the door panel fixing seat (320).

3. A hinge for a car scissor door according to claim 2, characterized in that: The movable connection seat (330) is provided with a motor, and the motor is linked to the second limiting gear (331) and can drive the second limiting gear (331) to rotate.

4. The hinge for a car scissor door according to claim 1, characterized in that: It also includes a vehicle body fixing seat (400) and a second universal connection device (500), and the articulated bracket (200) is connected to the vehicle body fixing seat (400) via the second universal connection device (500) so as to be rotatable in any direction.

5. The hinge for a car scissor door according to claim 4, characterized in that: The hinge bracket (200) is provided with a second guide pin (250), the vehicle body fixing seat (400) is provided with a second guide bracket (410), the second guide bracket (410) is provided with a second guide groove (420) capable of guiding the vehicle door to open outward, and the second guide pin (250) is connected to the second guide groove (420) and can move along the second guide groove (420).

6. The hinge for a car scissor door according to claim 4, characterized in that: The second universal connection device (500) comprises a second connection ball head (510) and a second ball head seat (520), wherein the second connection ball head (510) is connected to the vehicle body fixing seat (400), and the second ball head seat (520) is connected to the articulated bracket (200), and the second connection ball head (510) can be connected to the second ball head seat (520) in a rotatable manner in any direction.

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