A multi-stage limit hinge structure suitable for small vehicles

Abstract

The invention discloses a multi-stage limit hinge structure suitable for small vehicles, and relates to the field of automobile parts. Compared with the limit hinge in the prior art, the invention can not only limit the door when it is opened, but also realize multi-stage limit, increase the operational sense and controllability of the door opening, improve the convenience of the door opening and closing operation, and provide convenience for users. When opening and closing the door, the surface of the arc-shaped limit airbag and the L-shaped limit shaft can be sprayed with lubricating oil to lubricate them. Compared with the method of manually applying butter to the hinge rotation in the prior art, the lubricating oil can be continuously and automatically sprayed to the hinge rotation in a small amount, which can not only avoid the abnormal sound of the limit hinge rotation due to lack of lubricating oil when opening and closing the door, and ensure the quietness of the user when opening and closing the door, but also can automatically replenish oil and lubricate the hinge rotation without manual application, and provide convenience for users.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile parts, and in particular relates to a multi-stage limit hinge structure suitable for small vehicles. Background Art

[0002] The development of automobiles is accompanied by the progress of science and technology. The comfort, reliability and safety of automobiles are constantly improving. These are inseparable from the progress of various technologies. The main form of existing automobile door connection is the combination of door hinges and door limiters or gas springs. The limiter has only two gears, which brings a lot of inconvenience to drivers of different body shapes. The function of the door limiter is to limit the degree of door opening. On the one hand, it can limit the maximum opening of the door to prevent the door from opening too much and causing the door outer panel to collide with the car body; on the other hand, it can keep the door at a certain opening angle when needed, such as when the car is parked on a slope or when there is a normal wind, the door will not close automatically, so that the door is positioned at a certain angle.

[0003] There are many types of existing multi-stage limit hinge structures suitable for small vehicles. Although they can limit the door when it is opened and can achieve multi-stage limit, increase the operational feel and controllability of door opening, and improve the convenience of door opening and closing operations, but when the lubricating grease at the rotating part of the limit hinge is lacking or loses its lubricating effect, when the driver or passenger opens and closes the door, the rotating part of the limit hinge will produce abnormal noise and wear due to lack of lubrication, and the user experience and the service life of the limit hinge will be reduced. In view of this, the present invention is specially proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-stage limit hinge structure suitable for small vehicles that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a multi-speed limit hinge structure suitable for small vehicles, including a fixed hinge, a fixed connecting cylinder, a movable hinge and a movable connecting cylinder, the fixed hinge and the movable hinge are respectively fixedly connected to the vehicle body and the door through a limit fixing assembly, the fixed connecting cylinder and the movable connecting cylinder are rotatably connected through a connecting assembly, the connecting assembly is rotatably connected to the fixed connecting cylinder, and the connecting assembly is fixedly connected to the movable connecting cylinder, and also includes: an L-shaped limit shaft, fixedly connected to one end of the connecting assembly close to the fixed hinge; an arc-shaped limit plate, fixedly connected to one side of the lower end of the fixed hinge close to the L-shaped limit shaft; an arc-shaped limit groove is provided on the arc-shaped limit plate; multiple groups of arc-shaped limit airbags are symmetrically fixedly connected on the inner walls of both sides of the arc-shaped limit groove at equal intervals; an atomizing nozzle, embedded and installed on the inner wall of the arc-shaped limit plate close to each group of arc-shaped limit airbags; an oil supply assembly for providing lubricating oil to the atomizing nozzle, installed on the arc-shaped limit plate close to the atomizing nozzle.

[0006] In order to facilitate the supply of lubricating oil to the atomizing nozzle, the oil supply assembly further includes a piston rod with a piston, a first tensioning spring and an oil pipe. An oil extraction chamber is provided in the arc limiting plate near the arc limiting airbag, and an oil supply chamber is provided in the arc limiting plate at a side located at the oil extraction chamber and away from the atomizing nozzle. The oil outlet of the oil supply chamber is connected with the oil inlet of the oil extraction chamber, and the oil outlet of the oil extraction chamber is connected with the oil inlet of the atomizing nozzle through the oil pipe. Check valves are provided at the oil inlet and outlet of the oil extraction chamber. The first tensioning spring is fixedly connected in the oil extraction chamber, and the piston rod is slidably connected in the oil extraction chamber and the arc limiting airbag.

[0007] In order to improve the limiting effect of the arc-shaped limiting airbag on the L-shaped limiting shaft, while also ensuring the rapid return of the arc-shaped limiting airbag, further, an elastic iron sheet is fixedly connected to the inner wall of the arc-shaped limiting airbag away from the first tensioning spring, and the piston rod is tightly attached to the elastic iron sheet under the tension of the first tensioning spring.

[0008] In order to facilitate the continuous delivery of lubricating oil into the oil supply chamber, further, an oil storage tank is fixedly connected to the outer wall of the arc-shaped limit plate on the side away from the moving hinge, and the oil storage tank is respectively connected to multiple oil supply chambers. A unidirectional oil guide pipe is fixedly connected to one side of the oil storage tank, and an oil guide assembly for delivering lubricating oil to the oil supply chamber is provided in the oil storage tank.

[0009] In order to facilitate the squeezing of the lubricating oil in the oil storage tank into the oil supply chamber, so that the oil supply chamber is always filled with lubricating oil and it is convenient to transport the lubricating oil into the oil storage tank, further, the oil guide assembly includes an arc-shaped extrusion plate and a second tensioning spring, the arc-shaped extrusion plate is slidably connected in the oil storage tank, the second tensioning spring is fixedly connected in the oil storage tank at equal intervals and is fixedly connected to the side of the arc-shaped extrusion plate away from the oil supply chamber, the side of the oil storage tank away from the arc-shaped limiting plate is slidably connected with a pull rod, and the end of the pull rod close to the arc-shaped extrusion plate is fixedly connected to the arc-shaped extrusion plate.

[0010] In order to facilitate the connection of the limit hinge with the vehicle body and the door, the limit fixing assembly further includes a fixing bolt and a fixing gasket. The fixing bolt is rotatably connected to the side of the fixed hinge and the movable hinge away from the connecting assembly, and the fixing gasket is fixedly connected to the side of the fixed hinge and the movable hinge close to the screwing end of the fixing bolt.

[0011] In order to improve the stability of the connection between the limit hinge and the vehicle body and the door, further, the side of the fixed gasket close to the connecting component is fixedly connected to a tensioning airbag, the side of the tensioning airbag away from the fixed gasket is fixedly connected to a protective gasket, the side of the fixed gasket close to the tensioning airbag is fixedly connected to a T-bar at equal circumference and intervals, the protective gasket is slidably connected to the T-bar, and the protective gasket is in contact with the screwing end of the fixing bolt.

[0012] In order to facilitate the connection between the fixed hinge and the movable hinge, the connecting assembly further includes an axle pin, a square rod, and a screw rod. The axle pin is rotatably connected in the fixed connecting tube, the L-shaped limit shaft is fixedly connected to the lower end of the axle pin, the square rod is fixedly connected to the upper end of the axle pin, and the square rod is slidably connected to a square hole opened inside the movable connecting tube. A mounting block is embedded in the upper end of the movable connecting tube, and the screw rod passes through the mounting block upward and is fixedly connected to the mounting block thread through a nut.

[0013] In order to provide closing assistance when the door is closed and ensure that the door is completely closed, a torsion spring is further embedded in the lower end of the fixed connecting cylinder, and the torsion spring is sleeved on the axle pin and connected to the axle pin.

[0014] In order to improve the overall stability of the limit hinge structure so that the door can be stably mounted on the vehicle body, the fixed hinge and the fixed connecting cylinder are integrally formed, and the movable hinge and the movable connecting cylinder are integrally formed.

[0015] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: by symmetrically arranging multiple groups of arc-shaped limit airbags in the arc-shaped limit groove of the arc-shaped limit plate, and by the coordinated use of an atomizing nozzle and an oil supply assembly, compared with the limit hinge in the prior art, the present invention can not only limit the door when it is opened, but also realize multi-level limit, thereby increasing the operational feel and controllability of the door opening, improving the convenience of the door opening and closing operation, and providing convenience for users. When opening and closing the door, lubricating oil can be sprayed on the surface of the arc-shaped limit airbag and the L-shaped limit shaft to lubricate them. Compared with the method of manually applying butter to the hinge rotation in the prior art, a small amount of lubricating oil can be automatically sprayed to the hinge rotation, which can not only avoid abnormal noise at the rotation of the limit hinge due to lack of lubricating oil when opening and closing the door, thereby ensuring the quietness of the user when opening and closing the door, but also automatically replenish oil and lubricate the hinge rotation without manual application, thereby providing convenience for users.

[0016] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the attached picture:

[0018] Figure 1 A three-dimensional structural schematic diagram of a multi-stage limit hinge structure suitable for small vehicles proposed by the present invention;

[0019] Figure 2 This is a schematic structural diagram of a multi-position limiting hinge structure suitable for small vehicles proposed by the present invention;

[0020] Figure 3 A schematic diagram of the structure of an arc-shaped limit plate, an arc-shaped limit airbag, an oil storage tank, an oil supply assembly and an oil guide assembly in a multi-stage limit hinge structure suitable for small vehicles proposed by the present invention;

[0021] Figure 4 A multi-stage limit hinge structure suitable for small vehicles proposed by the present invention Figure 3 The structural diagram of part A in the figure;

[0022] Figure 5 A multi-stage limit hinge structure suitable for small vehicles proposed by the present invention Figure 3 The structural diagram of part B;

[0023] Figure 6 It is an exploded three-dimensional structural schematic diagram of a fixed hinge, a fixed connecting cylinder, a movable hinge, a movable connecting cylinder, a limiting fixing assembly and a connecting assembly in a multi-stage limiting hinge structure suitable for small vehicles proposed by the present invention;

[0024] Figure 7The present invention is a schematic exploded three-dimensional structural diagram of a position limiting fixing component in a multi-position limiting hinge structure suitable for small vehicles.

[0025] In the figure: 1, fixed hinge; 101, fixed connecting tube; 102, torsion spring; 2, moving hinge; 201, moving connecting tube; 202, mounting block; 203, nut; 204, square hole; 3, shaft pin; 301, L-shaped limit shaft; 302, square rod; 303, screw rod; 4, fixing bolt; 401, fixing gasket; 402, protective gasket; 403, T-shaped rod; 404, tensioning airbag ; 5. Arc-shaped limit plate; 501. Arc-shaped limit groove; 502. Arc-shaped limit airbag; 503. Oil extraction chamber; 504. Elastic iron sheet; 505. Piston rod; 506. First tensioning spring; 507. Oil supply chamber; 508. Atomizing nozzle; 509. Oil pipeline; 6. Oil storage tank; 601. Arc-shaped extrusion plate; 602. Second tensioning spring; 603. Oil guide pipe; 604. Pull rod. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0027] Embodiment 1:

[0028] Reference Figure 1-Figure 7 A multi-speed limit hinge structure suitable for small vehicles, comprising a fixed hinge 1, a fixed connecting cylinder 101, a movable hinge 2, and a movable connecting cylinder 201, wherein the fixed hinge 1 and the movable hinge 2 are respectively fixedly connected to the vehicle body and the door through a limit fixing assembly, the fixed connecting cylinder 101 is rotatably connected to the movable connecting cylinder 201 through a connecting assembly, the connecting assembly is rotatably connected to the fixed connecting cylinder 101, and the connecting assembly is fixedly connected to the movable connecting cylinder 201, and further comprising: an L-shaped limit shaft 301, fixedly connected to one end of the connecting assembly close to the fixed hinge 1 ; The arc-shaped limit plate 5 is fixedly connected to the lower end of the fixed hinge 1 on one side near the L-shaped limit axis 301; an arc-shaped limit groove 501 is provided on the arc-shaped limit plate 5; multiple groups of arc-shaped limit air bags 502 are symmetrically fixedly connected to the inner walls of both sides of the arc-shaped limit groove 501 at equal intervals; the atomizing nozzle 508 is embedded and installed on the inner wall of the arc-shaped limit plate 5 near each group of arc-shaped limit air bags 502; the oil supply component for providing lubricating oil to the atomizing nozzle 508 is installed on the arc-shaped limit plate 5 near the atomizing nozzle 508;

[0029] The oil supply assembly includes a piston rod 505 with a piston, a first tensioning spring 506 and an oil delivery pipe 509. An oil extraction chamber 503 is provided in the arc-shaped limit plate 5 near the arc-shaped limit airbag 502. An oil supply chamber 507 is provided in the arc-shaped limit plate 5 at a side located at the oil extraction chamber 503 and away from the atomizing nozzle 508. The oil outlet of the oil supply chamber 507 is connected to the oil inlet of the oil extraction chamber 503. The oil outlet of the oil extraction chamber 503 is connected to the oil inlet of the atomizing nozzle 508 through the oil delivery pipe 509. Check valves are provided at the oil inlet and outlet of the oil extraction chamber 503. The first tensioning spring 506 is fixedly connected in the oil extraction chamber 503. The piston rod 505 is slidably connected in the oil extraction chamber 503 and the arc-shaped limit airbag 502.

[0030] The position limiting fixing assembly includes a fixing bolt 4 and a fixing gasket 401. The fixing bolt 4 is rotatably connected to the fixed hinge 1 and the movable hinge 2 on a side away from the connecting assembly, and the fixing gasket 401 is fixedly connected to the fixed hinge 1 and the movable hinge 2 on a side close to the screwing end of the fixing bolt 4.

[0031] The connecting assembly includes an axle pin 3, a square rod 302, and a screw rod 303. The axle pin 3 is rotatably connected in the fixed connecting cylinder 101, the L-shaped limit shaft 301 is fixedly connected to the lower end of the axle pin 3, the square rod 302 is fixedly connected to the upper end of the axle pin 3, the square rod 302 is slidably connected in a square hole 204 opened inside the moving connecting cylinder 201, and a mounting block 202 is embedded in the upper end of the moving connecting cylinder 201. The screw rod 303 passes through the mounting block 202 upward and is threadedly fixedly connected to the mounting block 202 through the nut 203.

[0032] When installing the door to the door through the limit hinge, the installer first inserts the shaft pin 3 into the fixed connection tube 101, and then welds the square rod 302 to the shaft pin 3, and then inserts the square rod 302 into the square hole 204 of the moving connection tube 201, and then welds the screw rod 303 to the square rod 302, and fixes the screw rod 303 to the installation block 202 through the nut 203, so that the assembly of the fixed hinge 1 and the moving hinge 2 can be completed;

[0033] Then the installer moves the door to the designated position of the vehicle body for installing the door, and then respectively installs the fixed hinge 1 and the movable hinge 2 on the vehicle body and the door through the fixing bolts 4, so that the door can be installed on the vehicle body;

[0034] When the user opens the car door, the dynamic connecting cylinder 201 will drive the L-shaped limit shaft 301 to rotate through the shaft pin 3. When the L-shaped limit shaft 301 squeezes the arc-shaped limit airbag 502, the arc-shaped limit airbag 502 will squeeze the first tensioning spring 506 through the piston rod 505. When the L-shaped limit shaft 301 leaves the squeezed arc-shaped limit airbag 502, the piston rod 505 will push the arc-shaped limit airbag 502 back to the initial position under the tensioning force of the first tensioning spring 506, and at the same time suck the lubricating oil in the oil supply chamber 507 The oil is temporarily stored in the oil extraction chamber 503. When the L-shaped limit shaft 301 of the car door is closed and the arc-shaped limit airbag 502 is squeezed again, the lubricating oil stored in the oil extraction chamber 503 will be squeezed into the oil delivery pipe 509 by the piston rod 505. Then, the lubricating oil can be sprayed in the form of mist onto the arc-shaped limit airbag 502 and the L-shaped limit shaft 301 through the atomizing nozzle 508, so as to lubricate them and avoid abnormal noise at the rotation of the limit hinge when opening and closing the car door, effectively ensuring the quietness of the user when opening the car door and improving the experience of using the vehicle;

[0035] By installing multiple sets of arc-shaped limiting airbags 502 in the arc-shaped limiting groove 501, the door can be limited when it is opened, and multi-level limiting can be achieved, which increases the operational feel and controllability of the door opening, improves the convenience of the door opening and closing operation, and provides convenience for the user.

[0036] Embodiment 2:

[0037] Reference Figure 1-Figure 7 , a multi-stage limit hinge structure suitable for small vehicles, which is basically the same as Example 1, and further: an elastic iron sheet 504 is fixedly connected to the inner wall of the arc-shaped limit airbag 502 on the side away from the first tensioning spring 506, and the piston rod 505 is tightly attached to the elastic iron sheet 504 under the tension of the first tensioning spring 506. Through the setting of the elastic iron sheet 504, the limiting effect of the arc-shaped limit airbag 502 on the L-shaped limit shaft 301 can be improved, thereby ensuring the stability of the car door when it is opened to a certain angle, and at the same time, it can also ensure the rapid return of the arc-shaped limit airbag 502, effectively improving the practicality of the limit hinge.

[0038] Embodiment 3:

[0039] Reference Figure 1-Figure 7 , a multi-stage limit hinge structure suitable for small vehicles, which is basically the same as the embodiment 2, and further: an oil storage tank 6 is fixedly connected to the outer wall of the arc-shaped limit plate 5 away from the movable hinge 2, and the oil storage tank 6 is respectively connected to a plurality of oil supply chambers 507, and a one-way oil guide pipe 603 is fixedly connected to one side of the oil storage tank 6, and an oil guide component for conveying lubricating oil to the oil supply chamber 507 is provided in the oil storage tank 6;

[0040] The oil guide assembly includes an arc extrusion plate 601 and a second tensioning spring 602. The arc extrusion plate 601 is slidably connected in the oil storage tank 6. The second tensioning spring 602 is fixedly connected in the oil storage tank 6 at equal intervals and is fixedly connected to the side of the arc extrusion plate 601 away from the oil supply chamber 507. A pulling rod 604 is slidably connected to the side of the oil storage tank 6 away from the arc limiting plate 5. The end of the pulling rod 604 close to the arc extrusion plate 601 is fixedly connected to the arc extrusion plate 601.

[0041] When the L-shaped limit shaft 301 squeezes the arc-shaped limit airbag 502, the lubricating oil extracted from the oil supply chamber 507 by the piston rod 505 will be delivered to the atomizing nozzle 508 through the oil delivery pipe 509, and then the lubricating oil will be sprayed in the form of mist onto the surface of each group of two arc-shaped limit airbags 502 through the atomizing nozzle 508, thereby playing a lubricating role between the arc-shaped limit airbag 502 and the L-shaped limit shaft 301, avoiding abnormal noise at the limit hinge when opening the car door, effectively improving the quietness of the vehicle, and The setting of the second tensioning spring 602 can squeeze the lubricating oil in the oil storage tank 6 into the oil supply chamber 507, so that the oil supply chamber 507 always stores lubricating oil, thereby ensuring that the atomizing nozzle 508 can spray lubricating oil onto the surface of the arc-shaped limiting airbag 502. Through the setting of the pulling rod 604 and the oil guide pipe 603, when the lubricating oil in the oil storage tank 6 is completely squeezed out, the staff can pull the arc-shaped extrusion plate 601 back through the pulling rod 604, and then the lubricating oil can be transported to the oil storage tank 6 through the oil guide pipe 603 for storage, which provides convenience for the staff.

[0042] Embodiment 4:

[0043] Reference Figure 1-Figure 7A multi-stage limit hinge structure suitable for small vehicles is basically the same as Example 3, and further: a tensioning airbag 404 is fixedly connected to a side of a fixed gasket 401 close to the connecting component, a protective gasket 402 is fixedly connected to a side of the tensioning airbag 404 away from the fixed gasket 401, and a T-shaped rod 403 is fixedly connected to a side of the fixed gasket 401 close to the tensioning airbag 404 at equal circumferences and equal intervals, and the protective gasket 402 is slidably connected to the T-shaped rod 403, and the protective gasket 402 is attached to the screwing end of the fixing bolt 4. When the fixed hinge 1 and the movable hinge 2 are connected and fixed to the vehicle body and the door through the fixing bolt 4 When the fixing bolt 4 is tightened, the fixing bolt 4 can be squeezed against the tensioning airbag 404, and then the tensioning airbag 404 will exert a reverse force on the fixing bolt 4, thereby tightening the fixing bolt 4 and limiting the fixing bolt 4, effectively improving the fixing effect of the limiting hinge with the vehicle body and the door. Through the arrangement of the T-bar 403 and the protective gasket 402, when the installer screws the fixing bolt 4, the tensioning airbag 404 can be protected, avoiding friction between the fixing bolt 4 and the tensioning airbag 404, thereby preventing damage to the tensioning airbag 404, and effectively improving the protective effect of the tensioning airbag 404.

[0044] A torsion spring 102 is embedded in the lower end of the fixed connecting cylinder 101. The torsion spring 102 is sleeved on the shaft pin 3 and connected to the shaft pin 3. By installing the torsion spring 102 at the lower end of the fixed connecting cylinder 101 and connecting the shaft pin 3 and the torsion spring 102, when the arc-shaped limiting airbag 502 limits the L-shaped limiting shaft 301, a reverse force can be exerted on the L-shaped limiting shaft 301, thereby improving the stability of the door and preventing rotation. At the same time, a closing force is provided when the door is closed, ensuring that the door is completely closed, providing convenience for the user.

[0045] The fixed hinge 1 and the fixed connecting cylinder 101 are integrally formed, and the movable hinge 2 and the movable connecting cylinder 201 are integrally formed. By making the fixed hinge 1 and the fixed connecting cylinder 101 integrally formed, and the movable hinge 2 and the movable connecting cylinder 201 integrally formed, the stability between the fixed hinge 1 and the fixed connecting cylinder 101, and between the movable hinge 2 and the movable connecting cylinder 201 can be improved, thereby effectively improving the stability of the limiting hinge structure so that the door can be stably installed on the vehicle body.

[0046] The present invention symmetrically arranges multiple groups of arc-shaped limiting airbags 502 in the arc-shaped limiting groove 501 of the arc-shaped limiting plate 5, and uses an atomizing nozzle 508 and an oil supply component. Compared with the limiting hinge in the prior art, the present invention can not only limit the door when it is opened, but also realize multi-level limiting, thereby increasing the operational feel and controllability of the door opening, improving the convenience of the door opening and closing operation, and providing convenience for the user. When opening and closing the door, the surface of the arc-shaped limiting airbag 502 and the L-shaped limiting shaft 301 can be sprayed with lubricating oil to lubricate them. Compared with the method of manually applying butter to the hinge rotation in the prior art, the present invention can automatically and continuously spray a small amount of lubricating oil to the hinge rotation, which can not only avoid abnormal noise at the rotation of the limiting hinge due to lack of lubricating oil when opening and closing the door, thereby ensuring the quietness of the user when opening and closing the door, but also automatically replenish oil and lubricate the hinge rotation without manual application, thereby providing convenience for the user.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention.

Claims

1. A multi-position limit hinge structure suitable for small vehicles, characterized in that: The invention comprises a fixed hinge (1), a fixed connecting cylinder (101), a movable hinge (2), and a movable connecting cylinder (201), wherein the fixed hinge (1) and the movable hinge (2) are respectively fixedly connected to the vehicle body and the vehicle door via a position limiting fixing assembly, the fixed connecting cylinder (101) and the movable connecting cylinder (201) are rotationally connected via a connecting assembly, the connecting assembly is rotationally connected to the fixed connecting cylinder (101), and the connecting assembly is fixedly connected to the movable connecting cylinder (201), and further comprises: An L-shaped limiting shaft (301) fixedly connected to one end of the connecting component close to the fixed hinge (1); An arc-shaped limiting plate (5) is fixedly connected to one side of the lower end of the fixed hinge (1) close to the L-shaped limiting axis (301); The arc-shaped limiting plate (5) is provided with an arc-shaped limiting groove (501); Multiple groups of arc-shaped limiting airbags (502) are symmetrically and fixedly connected at equal intervals on the inner walls of both sides of the arc-shaped limiting groove (501); An atomizing nozzle (508) is embedded in the inner wall of the arc-shaped limiting plate (5) and is close to each group of arc-shaped limiting airbags (502); An oil supply assembly for supplying lubricating oil to the atomizing nozzle (508) is installed on the arc-shaped limiting plate (5) at a position close to the atomizing nozzle (508).

2. A multi-position limit hinge structure suitable for small vehicles according to claim 1, characterized in that: The oil supply assembly comprises a piston rod (505) with a piston, a first tensioning spring (506) and an oil delivery pipe (509); an oil extraction chamber (503) is provided in the arc-shaped limit plate (5) near the arc-shaped limit airbag (502); an oil supply chamber (507) is provided in the arc-shaped limit plate (5) at a side located at the oil extraction chamber (503) and away from the atomizing nozzle (508); an oil outlet of the oil supply chamber (507) is connected to the atomizing nozzle (508); The oil inlet of the oil pumping chamber (503) is connected, and the oil outlet of the oil pumping chamber (503) is connected to the oil inlet of the atomizing nozzle (508) through an oil delivery pipe (509). Check valves are provided at the oil inlet and outlet of the oil pumping chamber (503). The first tensioning spring (506) is fixedly connected in the oil pumping chamber (503), and the piston rod (505) is slidably connected in the oil pumping chamber (503) and the arc-shaped limiting airbag (502).

3. The multi-position limiting hinge structure suitable for small vehicles according to claim 2, characterized in that: An elastic iron sheet (504) is fixedly connected to the inner wall of the arc-shaped limiting airbag (502) on the side away from the first tensioning spring (506), and the piston rod (505) is tightly attached to the elastic iron sheet (504) under the tension of the first tensioning spring (506).

4. The multi-position limiting hinge structure suitable for small vehicles according to claim 2, characterized in that: An oil storage tank (6) is fixedly connected to the outer wall of one side of the arc-shaped limit plate (5) away from the movable hinge (2); the oil storage tank (6) is respectively connected to a plurality of oil supply chambers (507); a one-way oil guide pipe (603) is fixedly connected to one side of the oil storage tank (6); an oil guide assembly for conveying lubricating oil to the oil supply chamber (507) is provided in the oil storage tank (6).

5. The multi-position limiting hinge structure suitable for small vehicles according to claim 4, characterized in that: The oil guide assembly includes an arc-shaped extrusion plate (601) and a second tensioning spring (602); the arc-shaped extrusion plate (601) is slidably connected in the oil storage tank (6); the second tensioning spring (602) is fixedly connected in the oil storage tank (6) at equal intervals and is fixedly connected to the side of the arc-shaped extrusion plate (601) away from the oil supply chamber (507); a pulling rod (604) is slidably connected to the side of the oil storage tank (6) away from the arc-shaped limiting plate (5); and one end of the pulling rod (604) close to the arc-shaped extrusion plate (601) is fixedly connected to the arc-shaped extrusion plate (601).

6. The multi-position limiting hinge structure suitable for small vehicles according to claim 1, characterized in that: The position limiting fixing assembly comprises a fixing bolt (4) and a fixing gasket (401); the fixing bolt (4) is rotatably connected to a side of the fixed hinge (1) and the movable hinge (2) away from the connecting assembly; and the fixing gasket (401) is fixedly connected to a side of the fixed hinge (1) and the movable hinge (2) close to the screwing end of the fixing bolt (4).

7. A multi-position limit hinge structure suitable for small vehicles according to claim 6, characterized in that: A tensioning airbag (404) is fixedly connected to a side of the fixed gasket (401) close to the connection assembly, a protective gasket (402) is fixedly connected to a side of the tensioning airbag (404) away from the fixed gasket (401), a T-shaped rod (403) is fixedly connected to a side of the fixed gasket (401) close to the tensioning airbag (404) at equal circumference and equal intervals, the protective gasket (402) is slidably connected to the T-shaped rod (403), and the protective gasket (402) is in contact with the screwing end of the fixing bolt (4).

8. The multi-position limiting hinge structure suitable for small vehicles according to claim 1, characterized in that: The connecting assembly comprises an axle pin (3), a square rod (302), and a screw rod (303); the axle pin (3) is rotatably connected in the fixed connecting cylinder (101); the L-shaped limit shaft (301) is fixedly connected to the lower end of the axle pin (3); the square rod (302) is fixedly connected to the upper end of the axle pin (3); the square rod (302) is slidably connected in a square hole (204) provided inside the movable connecting cylinder (201); a mounting block (202) is embedded in the upper end of the movable connecting cylinder (201); the screw rod (303) passes through the mounting block (202) upwards, and is threadedly fixedly connected to the mounting block (202) through a nut (203).

9. The multi-position limiting hinge structure suitable for small vehicles according to claim 1, characterized in that: A torsion spring (102) is embedded in the lower end of the fixed connection cylinder (101), and the torsion spring (102) is sleeved on the shaft pin (3) and connected to the shaft pin (3).

10. The multi-position limiting hinge structure suitable for small vehicles according to claim 1, characterized in that: The fixed hinge (1) and the fixed connecting tube (101) are designed to be integrally formed, and the movable hinge (2) and the movable connecting tube (201) are designed to be integrally formed.

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