Jacking device and active hinge structure

Abstract

The application provides a jacking device and a driving hinge structure, and relates to the technical field of automobile safety, which comprises a main shell, a gas generator, an airbag assembly and a top cover. The main shell is provided with a mounting cavity and an upper opening. The gas generator is mounted at the bottom of the mounting cavity. The airbag assembly is arranged at the upper portion of the mounting cavity. The top cover seals the upper opening. The airbag assembly comprises an airbag shell and an airbag. The airbag shell comprises a barrel portion, an air inlet and an airbag top outlet. The airbag is accommodated in the inner chamber of the barrel portion. The airbag opening is communicated with the air inlet. The gas generator generates expanding gas to drive the airbag shell to move from an initial position to an ejection position and / or flow into the airbag to eject and unfold the airbag from the airbag top outlet. By arranging the airbag assembly and the top cover, sufficient jacking height is ensured, the size is small, and the limited engine compartment space is not excessively occupied.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile safety, in particular to a jacking device and an active hinge structure. BACKGROUND

[0002] The jacking device is a safety device installed on a vehicle, which can lift the engine hood when a collision occurs, thereby reducing the damage to pedestrians when a collision occurs.

[0003] The mainstream active hinge jacking device structure currently uses a metal jack rod as an actuator. Before triggering, the active hinge is a non-removable hinge. At the moment of contact with the metal jack rod, the non-removable hinge is changed into a movable hinge by the instantaneous impact force of the metal jack rod. After the fixed rivet of the active hinge is broken, the metal jack rod continues to lift the engine hood under the push of high-pressure gas in the jacking device until the preset lifting height is reached. Since different vehicle manufacturers set different lifting heights for different vehicle models, the structure design of the jacking device presents a personalized distribution. However, due to the limited space of the engine compartment, there is a high requirement for the miniaturization of the overall size of the jacking device.

[0004] Therefore, there is a need for a new jacking device structure that has sufficient lifting height while maintaining a small size. SUMMARY

[0005] Therefore, the embodiments of the present application provide a jacking device and an active hinge structure, which can ensure sufficient lifting height while maintaining a small size.

[0006] The embodiments of the present application provide the following technical solutions:

[0007] The jacking device provided by the embodiments of the present application comprises a main shell, a gas generator, a gas bag assembly, and a top cover.

[0008] The main shell is provided with a mounting cavity and an upper opening communicating with the mounting cavity. The gas generator is fixedly installed at the bottom of the mounting cavity. The gas bag assembly is slidably arranged at the upper portion of the mounting cavity. The top cover seals the upper opening.

[0009] The gas bag assembly comprises a gas bag shell and a gas bag. The gas bag shell comprises a cylinder portion consistent with the extension direction of the mounting cavity, an air inlet opposite to the gas outlet of the gas generator, and a gas bag top outlet opposite to the upper opening. The gas bag is accommodated in the inner chamber formed by the cylinder portion, and the gas bag opening is in communication with the air inlet.

[0010] The gas bag shell moves along the extension direction of the mounting cavity between an initial position close to the gas generator and an ejection position away from the gas generator.

[0011] The gas generator actuation generates expanding gas, which pushes the airbag housing to move from the initial position to the ejection position, and / or flows into the airbag interior to eject and deploy the airbag from the airbag ejection port.

[0012] By the above technical solution, the airbag assembly and the top cover are arranged. When the gas generator actuation generates expanding gas, the high pressure of the expanding gas pushes the airbag housing to slide relative to the mounting cavity, and moves from the initial position to the ejection position. In this process, the airbag housing pushes the top cover to eject from the upper port. The expanding gas generates a strong pushing force, so that the top cover breaks the active hinge. After the top cover breaks the active hinge, the engine hood originally constrained by the active hinge can continue to be lifted up. The expanding gas flows into the airbag interior to eject and deploy the airbag from the airbag ejection port. After the airbag is deployed, it continues to push the engine hood to lift up. Since the airbag can be compressed to a small volume in the uninflated state and can be expanded to a large volume in the inflated state, the sufficient lifting height can be ensured, and the size can be kept small, so that the limited engine compartment space is not occupied too much.

[0013] Preferably, the airbag housing includes a flange portion at one end of the cylinder portion. The flange portion is in abutment with the side wall of the mounting cavity in the circumferential direction. The outer diameter of the flange portion is greater than the diameter of the upper opening.

[0014] By the above technical solution, the flange portion is arranged. Since the diameter of the flange portion is greater than the diameter of the upper opening, when the upper end of the flange portion is lifted to the lower end of the upper opening, the airbag housing as a whole is constrained from being lifted up any more. At this time, the airbag housing is in the ejection position. The expanding gas continues to flow into the airbag interior, and the airbag is ejected from the airbag ejection port and deployed.

[0015] Preferably, the outer diameter of the cylinder portion is smaller than the diameter of the upper opening.

[0016] When the airbag housing is in the initial position, the top cover blocks the airbag ejection port, and the ejection path of the cylinder portion does not interfere with the upper opening.

[0017] When the airbag housing is in the ejection position, the cylinder portion at least partially extends out of the upper opening.

[0018] By arranging the top cover to block the airbag ejection port, when the gas generator actuation generates expanding gas, the cylinder portion moves from the initial position to the ejection position. In this process, since the top cover blocks the airbag ejection port and the upper opening at the same time, the contact section of the top cover and the upper opening can guide the movement of the cylinder portion, so that the cylinder portion can move along the extension direction of the upper opening in the movement process. The ejection path of the cylinder portion does not interfere with the upper opening, so that the cylinder portion can be smoothly ejected, and the reliability and stability during overall operation are improved.

[0019] Preferably, the interference force between the top cover and the airbag ejection port is greater than the interference force between the airbag housing and the mounting cavity.

[0020] When the gas generator is actuated to generate the expanding gas, the cylinder portion extends out of the upper opening, and then the air bag is ejected from the air bag top outlet.

[0021] By setting the interference force between the top cover and the upper opening to be greater than the interference force between the air bag shell and the mounting cavity, the air bag shell slides relative to the mounting cavity before the top cover during the generation of the expanding gas by the gas generator, so that the top cover is ejected first to break the active hinge during the overall operation, and the air bag is inflated and unfolded to continue lifting the hood.

[0022] Preferably, the diameter of the air inlet is smaller than the inner diameter of the cylinder portion, and the air bag opening is fixed at the end of the air inlet away from the gas generator in the circumferential direction by a compression ring.

[0023] Preferably, the mounting cavity penetrates the upper and lower surfaces of the main shell, and the mounting cavity includes an upper cavity and a lower cavity.

[0024] The air bag assembly is installed in the upper cavity, and the gas generator is installed in the lower cavity, and the inner wall of the lower cavity matches the outer surface of the gas generator.

[0025] Preferably, the main shell includes a shell main body, a top mounting plate, and a bottom mounting plate.

[0026] The top mounting plate and the bottom mounting plate are respectively located at the upper and lower ends of the shell main body, and the top mounting plate and the bottom mounting plate are fixedly connected to the shell main body by studs.

[0027] The outer periphery of the shell main body is also provided with a lug mounting portion for connecting with a vehicle or a boom.

[0028] Preferably, the part of the main shell between the inner wall of the mounting cavity and the outer wall of the main shell is an annular portion.

[0029] The annular portion is provided with a plurality of weight reduction grooves, which penetrate the upper and lower ends of the annular portion in the axial direction and are distributed in the circumferential direction on the annular portion.

[0030] By setting a plurality of weight reduction grooves, on the one hand, the weight of the overall structure can be reduced, and on the other hand, the outer wall of the main shell can be buffered when the internal gas explodes, reducing the harm when an accident occurs.

[0031] Preferably, a first sealing ring is arranged between the outer periphery of the gas generator and the inner wall of the mounting cavity.

[0032] A second sealing ring is arranged between the outer periphery of the air bag shell and the inner wall of the mounting cavity.

[0033] The embodiment of the present specification also provides an active hinge structure, comprising a first moving arm and a second moving arm, the first moving arm and the second moving arm are rotationally connected, an active hinge is arranged between the first moving arm and the second moving arm, the active hinge is used for constraining the rotation of the first moving arm relative to the second moving arm, and the first moving arm and the second moving arm are provided with the jacking device of any one of the above.

[0034] When the collision occurs, the jacking device is used for breaking the active hinge and jacking up the first moving arm.

[0035] Compared with the prior art, the at least one technical scheme adopted by the embodiment of the present specification can achieve at least the following beneficial effects:

[0036] 1. By arranging the air bag assembly and the top cover, when the gas generator is actuated to generate expanding gas, the high pressure of the expanding gas is used to push the air bag shell to slide relative to the mounting cavity, and move from the initial position to the ejection position. During the process, the air bag shell pushes the top cover to eject from the upper outlet, a strong pushing force is generated by the expanding gas, so that the top cover breaks the active hinge, and after the top cover breaks the active hinge, the engine cover originally constrained by the active hinge can continue to be jacked up by the continuously expanding air bag. Since the air bag can be compressed to a smaller volume in the uninflated state and can be expanded to a larger volume in the inflated state, sufficient jacking height can be ensured, and the limited engine compartment space can be occupied. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 is a schematic diagram of the overall structure of the jacking device of the present embodiment;

[0039] Figure 2 is a schematic diagram of the overall structure of the jacking device of the present embodiment when the cylinder is in the ejection position;

[0040] Figure 3 is a schematic diagram of the present embodiment when the air bag is expanded;

[0041] Figure 4 is a schematic diagram of the structure of the main body of the shell of the present embodiment;

[0042] Figure 5 is a schematic diagram of the active hinge structure of the present embodiment.

[0043] Reference numerals: 1, main housing; 101, housing main body; 102, top mounting plate; 103, bottom mounting plate; 104, lug mounting portion; 105, annular portion; 106, stud; 2, gas generator; 3, airbag assembly; 31, airbag housing; 311, cylinder portion; 312, air inlet; 313, airbag top outlet; 314, flange portion; 32, airbag; 4, top cover; 5, mounting cavity; 501, upper cavity; 502, lower cavity; 6, upper opening; 7, lower opening; 8, annular protruding region; 9, first sealing ring; 10, press ring; 11, second sealing ring; 12, weight-reducing groove; 13, first movable arm; 14, second movable arm; 15, main movable hinge. DETAILED DESCRIPTION

[0044] The embodiments of the present application will be described in detail below with reference to the drawings.

[0045] The above embodiments are only some of the embodiments of the present application, and are not all the embodiments of the present application. The present application can also be implemented or applied by using other different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] It should be noted that the various aspects described below are within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on the teachings herein one skilled in the art should appreciate that an aspect described herein can be implemented independently of any other aspects and that an aspect described herein can be implemented both as any number of software and / or hardware structures and as any number of these structures in any appropriate combination. For example, the apparatus can be implemented using any number and combination of the aspects set forth herein. Additionally, the apparatus and / or method can be implemented using other structure and / or functionality not expressly set forth herein.

[0047] It should also be noted that the drawings included in the following embodiments are only to schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components when actually implemented, and the shape, number and ratio of each component when actually implemented can be arbitrarily changed, and the layout of the components can be more complex.

[0048] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0049] In view of this, the inventors conducted in-depth research and improvement on the lifting device structure and found that the lifting devices using metal push rod structures in the existing technology have a large overall size in order to ensure sufficient lifting height, which will occupy the limited engine compartment space.

[0050] Based on this, the embodiments of this specification propose a lifting device: such as Figure 1 As shown, the system includes a main housing 1, a gas generator 2, an airbag assembly 3, and a top cover 4. The airbag assembly 3 includes an airbag housing 31 and an airbag 32. When the gas generator 2 is actuated, it generates expanding gas, which pushes the airbag housing 31 upward. Through the airbag housing 31 and the top cover 4, the active hinge is broken instead of the metal push rod. Then, the inflated airbag 32 lifts the hood, replacing the metal push rod structure for lifting the hood. Because the airbag 32 can be compressed to a small volume when deflating and can expand to a large volume when inflated, it can ensure sufficient lifting height while maintaining a small size, without occupying too much of the limited engine compartment space.

[0051] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0052] like Figure 1 As shown in the figure, this specification provides a lifting device, including: a main housing 1, a gas generator 2, an airbag assembly 3, and a top cover 4.

[0053] like Figure 1 and Figure 2 As shown, the main housing 1 includes a main body 101, a top mounting plate 102, and a bottom mounting plate 103. The main body 101 is cylindrical, and the top mounting plate 102 and the bottom mounting plate 103 are annular plates. The top mounting plate 102 and the bottom mounting plate 103 are fixed to the upper and lower ends of the main body 101 respectively by studs 106. Two lug mounting portions 104 are integrally provided on the outer circumference of the main body 101. The two lug mounting portions 104 are symmetrically distributed about the axis of the main body 101. Each lug mounting portion 104 is provided with a screw hole for connection with a vehicle or boom, so as to realize the installation and fixation of the main body 101 on the vehicle or boom.

[0054] The main body 101 of the housing has an installation cavity 5 inside, which extends vertically through the upper and lower surfaces of the main body 101. The installation cavity 5 includes an upper cavity 501 and a lower cavity 502 that are interconnected.

[0055] The top mounting plate 102 is provided with an upper opening 6 which is in communication with the upper cavity 501. The bottom mounting plate 103 is provided with a lower opening 7 which is in communication with the lower cavity 502.

[0056] The gas generator 2 is mounted in the lower cavity 502. The lower end of the gas generator 2 is fixed to the upper end of the bottom mounting plate 103. The inner wall of the lower cavity 502 is adapted to the outer surface of the gas generator 2, and the inner wall of the lower cavity 502 abuts the outer surface of the gas generator 2. The upper region of the inner wall of the lower cavity 502 protrudes inwardly relative to the lower region of the inner wall of the lower cavity 502, forming an annular protruding region 8. The annular protruding region 8 cooperates with the bottom mounting plate 103 to fix the gas generator 2. A first sealing ring 9 is arranged between the outer periphery of the gas generator 2 and the inner wall of the lower cavity 502 to enhance the sealing between the outer periphery of the gas generator 2 and the inner wall of the lower cavity 502.

[0057] In this embodiment, the outer surface of the gas generator 2 is provided with a rounded corner. In order to adapt to the outer surface of the gas generator 2, the lower end of the annular protruding region 8 is provided with a rounded corner, so that the rounded corner on the outer surface of the gas generator 2 fits the rounded corner at the lower end of the annular protruding region 8.

[0058] In other embodiments, the shape of the inner wall of the lower cavity 502 can be freely adjusted according to the outer surface of the gas generator 2.

[0059] The airbag assembly 3 is slidably arranged in the upper cavity 501, and the airbag assembly 3 comprises an airbag housing 31 and an airbag 32.

[0060] The airbag housing 31 is slidably mounted in the upper cavity 501.

[0061] The airbag housing 31 comprises a cylindrical portion 311 which extends in the same direction as the mounting cavity 5, an air inlet 312 which is opposite to the center position of the gas outlet of the gas generator 2 and the annular protruding region 8, an airbag top outlet 313 which is opposite to the upper opening 6, and a flange portion 314 which is coaxially arranged with the cylindrical portion 311. The flange portion 314 is located at the lower end region of the cylindrical portion 311, and the outer periphery diameter of the flange portion 314 is greater than the outer periphery diameter of the cylindrical portion 311. The flange portion 314 abuts the side wall of the upper cavity 501 in the circumferential direction, and the flange portion 314 and the upper cavity 501 are in interference connection. When the flange portion 314 is subjected to an axial force greater than the frictional force between the flange portion 314 and the upper cavity 501, the flange portion 314 slides relative to the inner wall of the upper cavity 501. The outer diameter of the flange portion 314 is greater than the diameter of the upper opening 6, and the outer diameter of the cylindrical portion 311 is less than the diameter of the upper opening 6.

[0062] The diameter of the air inlet 312 is less than the inner diameter of the cylindrical portion 311, and the lower end of the cylindrical portion 311 and the lower end of the flange portion 314 abut the upper end of the annular protruding region 8.

[0063] The airbag 32 is accommodated in the inner cavity of the cylinder portion 311, and the airbag 32 is fixed at the end of the air inlet 312 away from the gas generator 2 by the pressure ring 10 in the circumferential direction.

[0064] The upper region of the top cover 4 is sealed to the upper opening 6, and the lower region of the top cover 4 is sealed to the airbag top outlet 313. The interference force between the top cover 4 and the airbag top outlet 313 is greater than the interference force between the airbag shell 31 and the mounting cavity 5, and the pushing force required for the sliding of the top cover 4 relative to the airbag top outlet 313 is greater than the pushing force required for the sliding of the airbag shell 31 relative to the mounting cavity 5, that is, under the action of the same pushing force, after the cylinder portion of the airbag shell 31 extends out of the upper opening 6, the airbag 32 is further ejected from the airbag top outlet 313. As an optimization, the top cover 4 can be provided as a rubber plug, further enhancing the friction between the top cover 4 and the airbag top outlet 313, and enhancing the sealing between the top cover 4 and the airbag top outlet 313.

[0065] The position of the airbag shell 31 when approaching the gas generator 2 along the extension direction of the mounting cavity 5 is the initial position, and the position of the airbag shell 31 when moving away from the gas generator 2 along the extension direction of the mounting cavity 5 is the ejection position. Further, the position of the airbag shell 31 before the gas generator 2 is actuated is the initial position, and the position of the cylinder portion 311 after the gas generator 2 is actuated is the ejection position.

[0066] As Figures 1 to 3As shown, the overall working condition is as follows: the gas generator 2 is actuated and generates expanding gas, which rapidly fills the entire installation cavity 5; the expanding gas pushes the airbag shell 31 and the top cover 4, and the airbag shell 31 is pushed to slide relative to the installation cavity 5 before the top cover 4, and is lifted upward; during the lifting process, the contact part of the upper region of the top cover 4 with the upper opening 6 can provide guidance for the sliding of the airbag shell 31, so that the airbag shell 31 slides along the extension direction of the upper opening 6, avoiding interference between the ejection path of the cylinder and the upper opening 6; since the outer diameter of the cylinder portion 311 is smaller than the upper opening 6, the cylinder portion 311 will be lifted upward all the time until the upper end of the flange portion 314 abuts against the lower end of the upper opening 6, reaching the ejection position, during which the cylinder portion 311 will drive the top cover 4 to be lifted upward together, and part of the cylinder portion 311 together with the top cover 4 will break the active hinge that originally constrained the hood to continue to be lifted, so that the hood can continue to be lifted; after the upper end of the flange portion 314 abuts against the lower end of the upper opening 6, the cylinder portion 311 cannot continue to be lifted, at which time the top cover 4 originally blocked at the airbag top outlet 313 will be ejected, and after the gas flows into the airbag 32, the airbag 32 will be ejected from the airbag top outlet 313 and deployed, thereby continuing to lift the hood through the deployed airbag 32. Since the airbag 32 can be compressed to a smaller volume in the uninflated state and can be inflated to a larger volume in the inflated state, both sufficient lifting height and small size can be ensured, and the limited engine compartment space is not excessively occupied.

[0067] In other embodiments, the top cover 4 can not be provided to block the airbag top outlet 313, and only the top cover 4 can be provided to abut against the active hinge 15, so that the active hinge 15 is broken by the pushing force of the top cover 4 ejected from the upper opening 6, and the hood can continue to be lifted.

[0068] The outer periphery of the flange portion 314 and the inner wall of the installation cavity 5 are provided with a second sealing ring 11, which ensures the sealing between the outer periphery of the flange portion 314 and the inner wall of the installation cavity 5, so that the force of the gas acts more on the flange portion 314 and the cylinder portion 311.

[0069] As shown in Figs. 1 and 2, the shell main body 101 is provided with a plurality of weight reduction grooves 12, which are distributed in a circumferential direction on the axial end face of the annular portion 105. Figure 2 and Figure 4 As shown in Figs. 1 and 2, the shell main body 101 is provided with a plurality of weight reduction grooves 12, which are distributed in a circumferential direction on the axial end face of the annular portion 105. Through the arrangement of the weight reduction grooves 12, on the one hand, the weight of the shell main body 101 is reduced, and on the other hand, the outer wall of the shell main body 101 can be buffered when the internal gas explodes, reducing the harm in case of accident.

[0070] Two screw holes are further arranged on the annular part 105, and the screw holes are used for the threaded rods 106 connecting the main body 101, the top mounting plate 102 and the bottom mounting plate 103 to pass through.

[0071] The embodiment of the present specification further provides an active hinge structure, as shown in Figure 2 and Figure 5 The active hinge structure comprises a first moving arm 13 and a second moving arm 14. The first moving arm 13 is rotationally connected to the second moving arm 14, and the first moving arm 13 is used for connecting a hood. A main active hinge 15 is arranged between the first moving arm 13 and the second moving arm 14, and the main active hinge 15 is used for restricting the rotation of the first moving arm 13 relative to the second moving arm 14.

[0072] The main body 101 of the shell is fixedly installed on the second moving arm 14 through the lug mounting part 104 and the bolt, and the top cover 4 is arranged towards the first moving arm 13.

[0073] When the collision occurs, the top cover 4 is lifted, and the air bag shell 31 is pushed out to push the first moving arm 13 by the strong thrust generated by the expansion gas, the main active hinge 15 is broken, so that the first moving arm 13 can continue to rotate relative to the second moving arm 14, and then the hood connected to the first moving arm 13 can continue to be lifted by the unfolded air bag 32.

[0074] Each of the embodiments in the present specification is described in a progressive manner, and the same and similar parts between each of the embodiments can be referred to each other, and each of the embodiments focuses on the difference from other embodiments. Especially, for the product embodiment described later, since it is corresponding to the method, the description is relatively simple, and the related parts can be referred to the part of the system embodiment.

[0075] The above is merely a specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of the changes or replacements within the technical range disclosed by the present application, and all of them should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A jacking device, characterized in that The utility model relates to an airbag module, comprising: a main housing (1), a gas generator (2), an airbag assembly (3) and a top cover (4); the main housing (1) is equipped with installation cavity (5) and with installation cavity (5) communication's upper opening (6), the gas generator (2) fixed mounting in installation cavity (5) bottom, airbag assembly (3) can be slidably arranged in installation cavity (5) upper portion, the top cover (4) blocks upper opening (6); the airbag assembly (3) includes airbag housing (31) and airbag (32), the airbag housing (31) includes with installation cavity (5) extension direction consistent barrel portion (311), with the gas generator (2) air outlet opposite gas inlet (312) and with upper opening (6) opposite airbag top outlet (313), the airbag (32) is housed in the inner chamber formed by barrel portion (311), the airbag (32) opening with gas inlet (312) communication; The airbag housing (31) moves along the extension direction of the installation cavity (5) between the initial position close to the gas generator (2) and the ejection position away from the gas generator (2); The gas generator (2) actuates to generate expansion gas, and the expansion gas pushes the airbag housing (31) and the top cover (4). The airbag housing (31) is pushed to slide relative to the installation cavity (5) before the top cover (4), and is lifted upward. When the airbag housing (31) cannot continue to be lifted, the top cover (4) originally blocked at the airbag top outlet (313) is ejected, the expansion gas flows into the airbag (32), so that the airbag (32) is ejected from the airbag top outlet (313) and deployed, and then the external element is continuously lifted by the deployed airbag (32).

2. The jacking ram of claim 1, wherein The airbag housing (31) includes a flange portion (314) at the lower end of the barrel portion (311). The flange portion (314) is in contact with the side wall of the installation cavity (5) in the circumferential direction. The outer diameter of the flange portion (314) is greater than the diameter of the upper opening (6).

3. The jacking ram of claim 2, wherein The outer diameter of the barrel portion (311) is less than the diameter of the upper opening (6). When the airbag housing (31) is in the initial position, the top cover (4) blocks the airbag top outlet (313), and the ejection path of the barrel portion (311) does not interfere with the upper opening (6). When the airbag housing (31) is in the ejection position, the barrel portion (311) at least partially extends out of the upper opening (6).

4. The jacking ram of claim 3, wherein The interference force between the top cover (4) and the airbag top outlet (313) is greater than the interference force between the airbag housing (31) and the installation cavity (5). When the gas generator (2) actuates to generate expansion gas, the airbag (32) is ejected from the airbag top outlet (313) after the barrel portion of the airbag housing (31) extends out of the upper opening (6).

5. The jacking ram of claim 2 wherein, The air inlet (312) has a diameter smaller than the inner diameter of the cylinder portion (311), and the air bag (32) is fixed at one end of the air inlet (312) away from the gas generator (2) in the circumferential direction by a compression ring (10).

6. Jack according to any of claims 1-5, characterized in that The mounting cavity (5) penetrates the upper and lower surfaces of the main shell (1), and the mounting cavity (5) comprises an upper cavity (501) and a lower cavity (502); The air bag assembly (3) is mounted in the upper cavity (501), and the gas generator (2) is mounted in the lower cavity (502), and the inner wall of the lower cavity (502) matches the outer surface of the gas generator (2).

7. The jacking device according to any one of claims 1-5, wherein The main shell (1) comprises a shell main body (101), a top mounting plate (102), and a bottom mounting plate (103); The top mounting plate (102) and the bottom mounting plate (103) are respectively located at the upper and lower ends of the shell main body (101), and the top mounting plate (102) and the bottom mounting plate (103) are fixedly connected with the shell main body (101) by studs. The outer periphery of the shell main body (101) is further provided with a lug mounting portion (104), which is used for connecting with a vehicle or a movable arm.

8. The jacking device according to any one of claims 1-5, wherein The part between the inner wall of the mounting cavity (5) and the outer wall of the main shell (1) on the main shell (1) is an annular portion (105); The annular portion (105) is provided with a plurality of weight reduction grooves (12), the weight reduction grooves (12) penetrate the upper and lower ends of the annular portion (105) in the axial direction, and a plurality of the weight reduction grooves (12) are distributed in the circumferential direction on the annular portion (105).

9. The jacking device according to any one of claims 1-5, characterized in that A first sealing ring (9) is arranged between the outer periphery of the gas generator (2) and the inner wall of the mounting cavity (5); A second sealing ring (11) is arranged between the outer periphery of the air bag shell (31) and the inner wall of the mounting cavity (5).

10. An active hinge structure comprising a first moving arm (13) and a second moving arm (14), said first moving arm (13) and said second moving arm (14) being rotationally connected, a main active hinge (15) being provided between said first moving arm (13) and said second moving arm (14), said main active hinge (15) being configured to constrain the rotation of said first moving arm (13) with respect to said second moving arm (14), characterized in that, The first movable arm (13) and the second movable arm (14) are provided with the jacking device of any one of claims 1-9; When a collision occurs, the jacking device is used to break the main hinge (15) and push the first movable arm (13) to jack up.

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