Gas spring assembly and balance rod for automobile tail door

Abstract

The utility model relates to the technical field of automobile accessories, in particular to a gas spring and a balance rod with the gas spring for an automobile tail door. The gas spring assembly comprises a cylinder barrel, a first piston assembly, a second piston assembly, a piston rod and a valve spring, wherein the first piston assembly and the second piston assembly are embedded in the cylinder barrel in a sliding manner; the piston rod is arranged in the first piston assembly and the second piston assembly in a penetrating manner; the valve spring is arranged on the piston rod in a sleeving manner and clamped between the first piston assembly and the second piston assembly; the first piston assembly and the second piston assembly are each provided with a main flow channel used for providing gas circulation in the cylinder barrel when the part, extending out of the cylinder barrel, of the piston rod extends, and a speed limiting flow channel used for providing gas circulation in the cylinder barrel when the part, extending out of the cylinder barrel, of the piston rod shortens. By means of the air spring assembly, the tail door can descend slowly when the tail door loses supporting force of components such as the electric supporting rod.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to a gas spring and a tailgate balancing rod having the gas spring. Background Art

[0002] In the electric tailgate system of an automobile, a balance bar is usually used to assist the electric support bar in supporting the tailgate. Due to the heavy weight of the tailgate, when the electric support bar loses its supporting force on the tailgate due to failure or other reasons, the existing balance bar will shrink quickly, causing the tailgate to drop rapidly, thereby posing a safety hazard of injuring the user. Utility Model Content

[0003] The utility model aims to solve the problem that the tailgate drops rapidly when the balance bar is quickly retracted.

[0004] In order to solve the above problems, the utility model proposes a gas spring assembly, including a cylinder, a first piston assembly and a second piston assembly slidably embedded in the cylinder, a piston rod inserted in the first piston assembly and the second piston assembly, and a valve spring sleeved on the piston rod and clamped between the first piston assembly and the second piston assembly; the first piston assembly and the second piston assembly are both provided with a main flow channel for providing gas circulation in the cylinder when the portion of the piston rod extending relative to the cylinder is extended, and a speed-limiting flow channel for providing gas circulation in the cylinder when the portion of the piston rod extending relative to the cylinder is shortened.

[0005] Further, the first piston assembly includes a first piston, a first baffle abutting between the first piston and the valve spring, and a first sealing ring arranged between the first piston and the first baffle, the first sealing ring being used to switch the opening or closing of the main flow channel. The second piston assembly includes a second piston, a sliding sleeve abutting between the second piston and the valve spring, a second baffle abutting on a side of the second piston away from the first piston, and a second sealing ring arranged between the second piston and the second baffle, the sliding sleeve being used to switch the opening and closing of the speed-limiting flow channel, and the second sealing ring being used to switch the opening and closing of the main flow channel.

[0006] Furthermore, the first piston is cylindrical with an axial through hole, and a first piston main air groove is provided in the circumferential direction of the first piston. A first boss is provided in the axial direction on the end surface of the first piston close to the second piston, and a first boss main air groove is provided in the circumferential direction of the first boss, and a through flow limiting air groove is provided in the radial direction and close to the first boss main air groove on the surface of the first piston close to the second piston.

[0007] Furthermore, the second piston is cylindrical with an axial through hole, a second piston main air groove is provided on the circumferential surface of the second piston, a second boss is axially provided on the surface of the second piston away from the first piston, a second boss main air groove is axially provided on the surface of the second boss away from the first piston, and a through flow limiting air hole is axially provided on the second piston.

[0008] Preferably, the second piston assembly further comprises a third sealing ring arranged between the sliding sleeve and the second piston, and a receiving groove for receiving the third sealing ring is axially provided on a surface of the second piston close to the sliding sleeve.

[0009] Preferably, the piston rod is provided with a limiting boss along the axial direction on a side of the first piston assembly away from the second piston assembly, and a fixing piece is provided on a side of the second piston assembly away from the first piston assembly.

[0010] Furthermore, one end of the cylinder is closed, and the other end has an opening for the piston rod to pass through, and a sealing assembly is provided between the opening and the first piston assembly.

[0011] Compared with the prior art, the technical solution of the utility model has the following beneficial effects: through the gas spring assembly, the tailgate can be slowly lowered when the tailgate loses the support force of the electric support rod and other components. In addition, when the balance bar is extended and retracted, the main flow channel and the speed limit flow channel can be quickly switched on and off, so that the gas flow inside the gas spring assembly is smoother, and the balance bar can be kept stable when the tailgate is opened and closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a cross-sectional view of the balance bar of the utility model.

[0014] Figure 2 It is a schematic diagram of the exploded structure of the gas spring assembly of the utility model.

[0015] Figure 3 for Figure 2 Schematic diagram of the explosion structure from another perspective.

[0016] Figure 4 It is an isometric cross-sectional view of the gas spring assembly of the present utility model.

[0017] Figure 5 It is a schematic diagram of the exploded structure of the balance bar of the utility model.

[0018] Figure 6 for Figure 5 Schematic diagram of the explosion structure from another perspective.

[0019] Figure 7 It is a schematic diagram of the assembly of the piston assembly of the utility model.

[0020] Figure 8 It is an isometric cross-sectional view of the second ball seat of the utility model.

[0021] In the figure:

[0022] 1-cylinder; 11-opening;

[0023] 2-first piston assembly; 21-first piston; 22-first baffle; 23-first sealing ring; 21a-first piston main air groove; 24-first boss; 21b-first boss main air groove; 21c-flow limiting air groove; 221-first ventilation groove;

[0024] 3-second piston assembly; 31-second piston; 32-sliding sleeve; 33-second baffle; 34-second sealing ring; 31a-second piston main air groove; 35-second boss; 31b-second boss main air groove; 31c-flow limiting air hole; 36-third sealing ring; 31d-accommodating groove; 331-second ventilation groove;

[0025] 4-piston rod; 41-limiting boss; 42-fixing member;

[0026] 5-valve spring;

[0027] 6- Sealing assembly;

[0028] 7a-first sleeve; 7b-second sleeve;

[0029] 8a-first ball seat; 8b-second ball seat; 8c-cylinder seat;

[0030] 9- Mechanical spring. DETAILED DESCRIPTION

[0031] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The orientation or position relationship indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of description and simplified description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the utility model.

[0033] The terms "first", "second", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0034] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0035] See also Figure 1 , Figure 5 as well as Figure 6 The utility model provides a balance bar for a car tailgate, which includes a rod body 7a, 7b and a ball seat assembly 8a, 8b, wherein the rod body 7a, 7b is divided into a first sleeve 7a and a second sleeve 7b, and the first sleeve 7a and the second sleeve 7b are both hollow round rods. Preferably, the outer diameter of the first sleeve 7a is slightly smaller than the inner diameter of the second sleeve 7b, so that the first sleeve 7a can reciprocate along a straight line in the inner wall of the second sleeve 7b. In another specific embodiment, the inner diameter of the first sleeve 7a can be slightly larger than the outer diameter of the second sleeve 7b. The ball seat assembly 8a, 8b is divided into a first ball seat 8a connected to the end of the first sleeve 7a away from the second sleeve 7b, and a second ball seat 8b connected to the end of the second sleeve 7b away from the first sleeve 7a. In a specific embodiment, the first ball seat 8a is hinged on the trunk of the car, and the second ball seat 8b is hinged on the surface of the tailgate panel of the car. When the tailgate is opened or closed, the first sleeve 7a rotates with the first ball seat 8a as the center, and the second sleeve 7b expands and contracts along the inner wall of the first sleeve 7a.

[0036] Furthermore, the balance rod of the utility model also includes a mechanical spring 9 and a cylinder seat 8c. The mechanical spring 9 is inserted into the first sleeve 7a and the second sleeve 7b. The cylinder seat 8c is partially embedded in the second sleeve 7b and abuts or clamps with the second ball seat 8b. In addition, the two ends of the mechanical spring 9 are respectively abutted between the first ball seat 8a and the cylinder seat 8c.

[0037] According to the length of the rod bodies 7a, 7b of the balance bar and the force required to be provided, the mechanical spring 9 can be one or multiple coil springs connected in series. Further, when the tailgate is completely closed, that is, when the balance bar is retracted, the mechanical spring 9 is preferably a compression spring, so that when the tailgate is opened, the balance bar has a certain driving force on the tailgate. In addition, when the tailgate is closed, the tailgate drops to a certain height, and the balance bar generates a certain resistance to the tailgate through the thrust of the mechanical spring 9, preventing the tailgate from dropping quickly.

[0038] The cylinder seat 8c, the first ball seat 8a and the second ball seat 8b can all be made of metal or non-metal. Preferably, the cylinder seat 8c, the first ball seat 8a and the second ball seat 8b are all plastic parts, so as to avoid the problem of salt spray corrosion. The cylinder seat 8c and the second sleeve 7b can be connected by threaded connection, interference fit, bonding and the like. Preferably, the cylinder seat 8c and the second sleeve 7b are fixedly connected by laser welding.

[0039] Furthermore, a gas spring assembly is provided inside the rod bodies 7a and 7b of the balancing rod, and the gas spring assembly is inserted into the mechanical spring 9. When the tailgate falls, for example, when the supporting components such as the electric strut fail, the gas spring assembly can brake and decelerate the tailgate at the moment of its descent, so that the tailgate descends slowly to prevent the user from being injured.

[0040] like Figure 1-3 As shown, the gas spring assembly includes a cylinder 1, piston assemblies 2, 3 and a piston rod 4. The cylinder 1 is in the shape of a hollow long cylinder, one end of which is closed and used to store fluids such as gas, and the other end has an opening 11 for the piston rod 4 to pass through. The closed end of the cylinder 1 is fixedly connected to the second ball seat 8b, and the end of the piston rod 4 away from the cylinder 1 is fixedly connected to the first ball seat 8a. The other end of the piston rod 4 is a free end, and the piston rod 4 is at least partially inserted into the cylinder 1. Furthermore, the piston assemblies 2, 3 are sleeved on one side of the free end of the piston rod 4 and are slidably arranged inside the cylinder 1. The connection between the cylinder 1 and the second ball seat 8b and the connection between the piston rod 4 and the first ball seat 8a can be interference fit or adhesive bonding in the prior art.

[0041] like Figure 1 , Figure 8 As shown, in a specific embodiment, the connection between the cylinder 1 and the second ball seat 8b and the connection between the piston rod 4 and the first ball seat 8a are preferably connected by threaded connection, and the first ball seat 8a and the second ball seat 8b are respectively embedded with a first threaded sleeve 81 and a second threaded sleeve 82 made of metal material, thereby facilitating production and processing while improving connection reliability.

[0042] like Figure 2-4As shown, further, the piston assembly 2, 3 includes a first piston assembly 2 and a second piston assembly 3 respectively abutting against the two ends of the valve spring 5. The first piston assembly 2 includes a first piston 21, a first sealing ring 23 and a first baffle 22, wherein the first baffle 22 abuts between the first piston 21 and the valve spring 5, the first sealing ring 23 is arranged between the first piston 21 and the first baffle 22, and the first sealing ring 23 is used to switch the opening or closing of the main flow channel. The second piston assembly 3 includes a second piston 31, a second sealing ring 34, a second baffle 33 and a sleeve 32, wherein the sleeve 32 is arranged between the second piston 31 and the valve spring 5, the second baffle 33 abuts against the side of the second piston 31 away from the first piston 21, the second sealing ring 34 is arranged between the second piston 31 and the second baffle 33, the sleeve 32 is used to switch the opening and closing of the speed limiting flow channel, and the second sealing ring 34 is used to switch the opening and closing of the main flow channel.

[0043] Preferably, the gas spring assembly further includes a third sealing ring 36 , which is sandwiched between the sleeve 32 and the second sealing ring 34 , and a receiving groove 31 d for receiving the third sealing ring 36 is formed on the surface of the second piston 31 close to the first piston 21 .

[0044] like Figure 2 , Figure 3 As shown, the first sealing ring 23, the second sealing ring 34 and the third sealing ring 36 are preferably annular O-rings, and the material is preferably a material with a certain degree of flexibility, such as rubber. The outer diameters of the first sealing ring 23 and the second sealing ring 34 are slightly larger than the outer diameters of the first piston 21 and the second piston 31, and are also slightly larger than the inner diameter of the cylinder 1, so that when the piston rod 4 is extended relative to the extended part of the cylinder 1, the first sealing ring 23 and the second sealing ring 34 can form friction with the inner wall of the cylinder 1, and then can slide relative to the first piston 21 and the second piston 31 respectively, to achieve the opening or closing of the switching main flow channel.

[0045] Furthermore, the outer diameter of the third sealing ring 36 is smaller than the inner diameter of the cylinder 1, that is, there is a certain gap between the third sealing ring 36 and the inner wall of the cylinder 1. When the tailgate descends, the balance rod is driven to contract. At this time, the gas in the cylinder 1 flows from the second piston 31 to the first piston 21 through the speed limiting channel, thereby driving the third sealing ring 36 to slide in the direction of the first piston 21, and then pushing the sleeve 32 arranged adjacent to the third sealing ring 36 to slide in the direction of the first piston 21 at the same time. At this time, the valve spring 5 is in a compressed state due to the thrust of the sleeve 32. When the elastic force generated by the compression of the valve spring 5 is less than the gas pressure in the speed limiting channel, the speed limiting channel opens. Since the gas in the cylinder 1 flows slowly through the speed limiting channel, the balance rod can be slowly lowered.

[0046] Furthermore, the first baffle 22 and the second baffle 33 are both cylindrical with an axial through hole, and are respectively provided with a first ventilation groove 221 and a second ventilation groove 331 that are axially connected. The first ventilation groove 221 and the second ventilation groove 331 can be circular, triangular, polygonal, etc., preferably with an open U-shape. According to the outer diameter of the baffle, the number of the first ventilation groove 221 and the second ventilation groove 331 can be one or more. In a specific embodiment, the number of the first ventilation groove 221 and the second ventilation groove 331 are both 3, and are evenly distributed on the circumferential surface of the first baffle 22 and the second baffle 33.

[0047] Furthermore, the first piston 21 is cylindrical with an axial through hole, and the surface of the first piston 21 is provided with a first piston main gas groove 21a, a first boss main gas groove 21b and a flow-limiting gas groove 21c. Among them, the circumferential surface of the first piston 21 is radially recessed to form the first piston main gas groove 21a, and the end surface of the first piston 21 close to the second piston 31 is axially formed with a first boss 24, and the first boss 24 can be a prism, cone or annular with an axial through hole. Preferably, the first boss 24 is annular with the same inner diameter as the inner diameter of the first piston 21, and the first boss 24 is circumferentially recessed to form the first boss main gas groove 21b. Preferably, the first boss main gas groove 21b is arranged opposite to the first piston main gas groove 21a, for example, the geometric center line of the first boss main gas groove 21b, the first piston main gas groove 21a and the first piston 21 is coplanar. In addition, the flow-limiting groove 21 c is opened through the surface of the first piston 21 close to the second piston 31 . Preferably, the flow-limiting groove 21 c is arranged along the radial direction of the first piston 21 .

[0048] Furthermore, the second piston 31 is also cylindrical with an axial through hole, and is provided with a second piston main air groove 31a, a second boss main air groove 31b and a flow-limiting air hole 31c. The circumferential surface of the second piston 31 is radially recessed to form the second piston main air groove 31a, and the surface of the second piston 31 away from the first piston 21 protrudes the second boss 35 axially. The second boss 35 can also be a prism, cone or annular with an axial through hole. Preferably, the second boss 35 is annular with the same inner diameter as the inner diameter of the second piston 31. The surface of the second boss 35 away from the first piston 21 is axially recessed to form the second boss main air groove 31b. Preferably, the second boss main air groove 31b has a connected vent along the radial direction of the second piston 31. Preferably, the flow-limiting air hole 31c is arranged along the axial direction of the second piston 31.

[0049] According to the different inner diameters of the cylinder 1, the first piston main gas groove 21a, the second piston main gas groove 31a, the first boss main gas groove 21b, the second boss main gas groove 31b, the flow-limiting gas groove 21c and the flow-limiting gas hole 31c can be one or more. The first piston main gas groove 21a, the second piston main gas groove 31a, the first boss main gas groove 21b and the second boss main gas groove 31b are used to form a main flow channel for gas to flow in the cylinder 1 when the horizontal support rod is extended, and the flow-limiting gas groove 21c and the flow-limiting gas hole 31c are used to form a speed-limiting flow channel for gas to flow in the cylinder 1 when the balance rod is compressed. Preferably, the number of the first piston main gas groove 21a, the second piston main gas groove 31a, the first boss main gas groove 21b and the second boss main gas groove 31b is multiple, and the number of the flow-limiting gas groove 21c and the flow-limiting gas hole 31c is less than the above-mentioned main gas grooves.

[0050] In a specific embodiment, the number of the first piston main gas groove 21a, the second piston main gas groove 31a, the first boss main gas groove 21b, and the second boss main gas groove 31b is the same, which is 6, the number of the flow-limiting gas groove 21c is 1, and the number of the flow-limiting gas holes 31c is 3. Preferably, the geometric center lines of the first piston main gas groove 21a and the first boss main gas groove 21b are parallel to the axial direction of the first piston 21, the first piston main gas groove 21a is evenly arranged on the circumferential surface of the first piston 21, and the first boss main gas groove 21b is evenly arranged on the circumferential outer surface of the first boss 24; the geometric center lines of the second piston main gas groove 31a and the second boss main gas groove 31b are parallel to the axial direction of the second piston 31, the second piston main gas groove 31a is evenly arranged on the circumferential surface of the second piston 31; the second boss main gas groove 31b is evenly arranged on the circumferential surface of the second boss 35.

[0051] In addition, if Figure 4 , Figure 7 As shown, the first sealing ring 23 is sleeved on the first boss 24, and the second sealing ring 34 is sleeved on the second boss 35, and the inner diameter of the first sealing ring 23 is slightly larger than the circumferential maximum diameter of the first boss 24, and the inner diameter of the second sealing ring 34 is also slightly larger than the circumferential maximum diameter of the second boss 35, that is, there are small gaps between the first sealing ring 23 and the second sealing ring 34 and the first boss 24 and the second boss 35 respectively, so that when the balance rod is extended or retracted, it is convenient for the first sealing ring 23 and the second sealing ring 34 to linearly displace relative to the cylinder 1, thereby switching the main channel on and off.

[0052] like Figure 2As shown, preferably, the gas spring assembly also includes a fixing member 42, which is arranged at a position close to the free end of the piston rod 4, and is used to limit the axial displacement of the second piston assembly 3 along the piston rod 4, and at the position where the piston rod 4 is connected to the first piston 21, a limiting boss 41 is provided on the side of the first piston 21 away from the second piston 31 for limiting the axial displacement of the first piston 21 along the piston rod 4. That is, the first piston assembly 2 and the second piston assembly 3 are arranged between the limiting boss 41 and the fixing member 42. In addition, a fixing member 42 can also be added to replace the limiting boss. In a specific embodiment, the fixing member 42 is preferably connected to the piston rod 4 by a nut through a thread, and the fixing member 42 can also be connected to the piston rod 4 by bonding, welding or interference fit.

[0053] like Figure 4 As shown, preferably, the gas spring assembly further comprises a sealing assembly 6 , which is disposed between the opening 11 of the cylinder 1 and the piston assemblies 2 , 3 , and is used to seal the gas or other fluid in the cylinder 1 .

[0054] The principle of the balance bar of the utility model is described as follows. When the balance bar is extended, the valve spring 5 abuts between the first baffle 22 and the sliding sleeve 32, so that the first baffle 22 and the sliding sleeve 32 are stationary relative to the piston rod 4, so that the third sealing ring 36 adjacent to the sliding sleeve 32 is partially or completely embedded in the accommodating groove 31d on the second piston 31, and the speed limiting air hole is closed. At the same time, the first sealing ring 23 and the second sealing ring 34 move relative to the piston rod 4 toward the direction of the fixing member 42 due to the friction between them and the inner wall of the cylinder. At this time, the main flow channel is opened and the speed limiting flow channel does not work. The gas flow path in the cylinder 1 is the first piston main gas groove 21a-the first boss main gas groove 21b-the first ventilation groove 221-the second piston main gas groove 31a-the second boss main gas groove 31b-the second ventilation groove 31a. At this time, the mechanical spring 9 is mainly responsible for the balance bar, and the gas spring assembly is almost ineffective at this time.

[0055] When the balance bar contracts rapidly, the gas pressure in the speed-limiting flow channel is greater than the elastic force of the valve spring 5, driving the third sealing ring 36 to slide along the piston rod 4 toward the first piston 21, thereby pushing the sleeve 32. At the same time, due to the friction between the first sealing ring 23 and the second sealing ring 34 and the inner wall of the cylinder barrel 1, both move relative to the piston rod 4 toward the opening 11 of the cylinder barrel 1. At this time, the speed-limiting flow channel is opened and the main flow channel is closed. The gas flow path in the cylinder barrel 1 is the second ventilation groove 331-flow-limiting air hole 31c-first ventilation groove 221-first boss main air groove 21b-flow-limiting air groove 21c.

[0056] The cylinder 1 of the gas spring assembly can be filled with liquid or gas, preferably pressurized gas, so that when the balance bar is extended or retracted, the main flow channel and the speed-limiting flow channel can be quickly switched, and when the balance bar is extended or retracted, the gas in the cylinder 1 flows more smoothly. In addition, when the tailgate is suddenly lowered, the gas in the gas spring assembly slowly contracts the balance bar through the speed-limiting flow channel, which, on the one hand, acts as an instant brake on the tailgate, and on the other hand, provides a stable support force to keep the tailgate stable when closed.

[0057] Preferably, the first piston 21, the second piston 31 and the sleeve 32 are all formed by powder metallurgy, which can improve production efficiency while ensuring processing accuracy. In addition, the structures of the first piston 21 and the second piston 31 in the utility model are suitable for integral molding by powder metallurgy, thereby improving the product yield.

[0058] The balance bar of the present invention can also be used for engine hoods, etc. The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A gas spring assembly, characterized in that: The invention comprises a cylinder (1), a first piston assembly (2) and a second piston assembly (3) slidably embedded in the cylinder (1), a piston rod (4) passing through the first piston assembly (2) and the second piston assembly (3), and a valve spring (5) sleeved on the piston rod (4) and sandwiched between the first piston assembly (2) and the second piston assembly (3); the first piston assembly (2) and the second piston assembly (3) are both provided with a main flow channel for gas circulation in the cylinder (1) when the portion of the piston rod (4) extending relative to the cylinder (1) is extended, and a speed-limiting flow channel for gas circulation in the cylinder (1) when the portion of the piston rod (4) extending relative to the cylinder (1) is shortened.

2. The gas spring assembly according to claim 1, characterized in that: The first piston assembly (2) comprises a first piston (21), a first baffle (22) abutting between the first piston (21) and the valve spring (5), and a first sealing ring (23) arranged between the first piston (21) and the first baffle (22), wherein the first sealing ring (23) is used to switch the main flow channel open or closed.

3. The gas spring assembly according to claim 2, characterized in that: The second piston assembly (3) comprises a second piston (31), a sleeve (32) abutting between the second piston (31) and the valve spring (5), a second baffle (33) abutting against a side of the second piston (31) away from the first piston (21), and a second sealing ring (34) arranged between the second piston (31) and the second baffle (33), wherein the sleeve (32) is used to switch the opening and closing of the speed limiting flow channel, and the second sealing ring (34) is used to switch the opening and closing of the main flow channel.

4. The gas spring assembly according to claim 3, characterized in that: The first piston (21) is cylindrical with an axial through hole, and a first piston main air groove (21a) is provided in the circumference of the first piston (21).

5. The gas spring assembly according to claim 4, characterized in that: A first boss (24) is axially provided on the end surface of the first piston (21) close to the second piston (31); a first boss main air groove (21b) is circumferentially provided on the first boss (24); and a through flow-limiting air groove (21c) is radially provided on the surface of the first piston (21) close to the second piston (31) and adjacent to the first boss main air groove (21b).

6. The gas spring assembly according to claim 5, characterized in that: The second piston (31) is cylindrical with an axial through hole. A second piston main air groove (31a) is provided on the circumferential surface of the second piston (31). A second boss (35) is axially provided on the surface of the second piston (31) away from the first piston (21). A second boss main air groove (31b) is axially provided on the surface of the second boss (35) away from the first piston (21). A through flow limiting air hole (31c) is axially provided on the second piston (31).

7. The gas spring assembly according to claim 6, characterized in that: The second piston assembly (3) further comprises a third sealing ring (36) arranged between the sliding sleeve (32) and the second piston (31), and a receiving groove (31d) for receiving the third sealing ring (36) is axially provided on a surface of the second piston (31) close to the sliding sleeve (32).

8. The gas spring assembly according to claim 1, characterized in that: The piston rod (4) is provided with a limiting boss (41) along the axial direction on a side of the first piston assembly (2) away from the second piston assembly (3), and a fixing member (42) is provided on a side of the second piston assembly (3) away from the first piston assembly (2).

9. The gas spring assembly according to claim 2, characterized in that: One end of the cylinder (1) is closed, and the other end has an opening (11) for the piston rod (4) to pass through, and a sealing component (6) is provided between the opening (11) and the first piston component (2).

10. A balancing rod for a car tailgate, comprising a first sleeve (7a) and a second sleeve (7b) which are sleeved together, characterized in that: It also includes the gas spring assembly as described in any one of claims 1 to 9, a first ball seat (8a) fixedly connected to the piston rod (4), a second ball seat (8b) fixedly connected to the cylinder (1), a cylinder seat (8c) partially embedded in the second sleeve (7b) and abutting or clamping with the second ball seat (8b), and a mechanical spring (9) sleeved outside the gas spring assembly and abutting between the first ball seat (8a) and the cylinder seat (8c).

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