Buffer device and vehicle thereof

Abstract

The present application relates to a buffer device and a vehicle thereof, comprising: a cylinder, an elastic member, a piston assembly and an adjusting assembly, wherein the cylinder is provided with a sliding groove, the piston assembly comprises a piston push rod and a piston plate, and a receiving chamber is formed between the piston push rod and the piston plate; the adjusting assembly comprises a fixed member, a movable member and an adjusting medium, the fixed member is provided with an installation chamber, and the installation chamber comprises a first opening and a second opening connected to the receiving chamber; the movable member is provided with a through hole, and the through hole is provided corresponding to the first opening, and the area of ​​the through hole is smaller than the area of ​​the first opening; wherein the orthographic projection of the first opening in the sliding groove is located within the orthographic projection of the movable member in the sliding groove, and the orthographic projection of the through hole in the sliding groove is located within the orthographic projection of the first opening in the sliding groove; the adjusting medium is used to drive the movable member to cover or move away from the first opening. The buffer device and the vehicle thereof of this scheme can not only play a buffering role after the buffer device is hit, but also effectively avoid the rapid rebound of the piston push rod.

Description

Technical Field

[0001] The present application relates to the technical field of automobile accessories, and in particular to a buffer device and a vehicle thereof. Background Art

[0002] The buffer structure of automobile doors is mainly rubber buffer blocks, which are of two types: fixed and adjustable. When the door is opened and closed, the buffer block can provide a certain buffering and shock absorption effect. However, the two current buffer blocks only provide buffering and shock absorption effects. After compression, the buffer block will generate a large rebound force and rebound speed, resulting in a large self-closing tendency of the door after it is opened to the maximum position due to the rebound force and rebound speed of the buffer block, which eventually causes the door to slip out of the limit area of ​​the door opening. Utility Model Content

[0003] The purpose of the present application is to provide a buffer device and a vehicle thereof, which can not only play a buffering role but also effectively prevent the rapid rebound of the piston push rod after the buffer device is hit.

[0004] The first aspect of the present application discloses a buffer device, comprising: a cylinder, an elastic member, a piston assembly and an adjusting assembly, wherein the cylinder is provided with a sliding groove, the elastic member is installed in the sliding groove, the piston assembly comprises a piston push rod and a piston sheet both located in the sliding groove, the piston sheet is located between the elastic member and the piston push rod, and a receiving cavity is formed between the piston push rod and the piston sheet; the adjusting assembly comprises: a fixing member, the fixing member is connected to the inner wall of the sliding groove and is located between the piston push rod and the piston sheet, the fixing member is provided with an installation cavity, the installation cavity comprises a first opening and a second opening communicating with the receiving cavity, the first opening is opposite to the first opening The second opening is closer to the piston push rod; a movable part, the movable part is arranged in the installation cavity, the movable part is provided with a through hole penetrating the movable part, the through hole is arranged corresponding to the first opening, and the area of ​​the through hole is smaller than the area of ​​the first opening; wherein, from the piston assembly to the first direction of the elastic part: the orthographic projection of the first opening in the sliding groove is located within the orthographic projection of the movable part in the sliding groove, and the orthographic projection of the through hole in the sliding groove is located within the orthographic projection of the first opening in the sliding groove; an adjusting medium, the adjusting medium is located in the accommodating cavity, and is used to drive the movable part to seal in the installation cavity or move away from the first opening.

[0005] In an exemplary embodiment of the present application, the fixing member includes a fixing block and a cover plate arranged relatively to each other along the first direction, the cover plate is connected to the fixing block, the mounting cavity is located between the cover plate and the fixing block, the first opening is arranged on the fixing block along the first direction, and the second opening is arranged on the fixing block along a second direction intersecting with the first direction; the movable member is located between the cover plate and the fixing block.

[0006] In an exemplary embodiment of the present application, the second opening is arranged around the fixing block along the second direction.

[0007] In an exemplary embodiment of the present application, the second opening includes a plurality of notches, and the plurality of notches are arranged on the fixing block at intervals along the second direction, and the intervals between two adjacent notches are equal.

[0008] In an exemplary embodiment of the present application, the fixed block includes a first fixed section and a plurality of second fixed sections which are arranged in sequence away from the piston push rod along the first direction, the first fixed section is connected to the side groove wall of the sliding groove, and is arranged to fit the side groove wall of the sliding groove along the second direction, the plurality of second fixed sections are arranged at intervals from each other along the second direction, and are connected between the first fixed section and the cover plate; the notch is located between two adjacent second fixed sections.

[0009] In an exemplary embodiment of the present application, the movable member is located between a plurality of the second fixing segments and is in contact with the plurality of the second fixing segments.

[0010] In an exemplary embodiment of the present application, the sliding groove includes a first groove section and a second groove section arranged along the first direction, the elastic member, the piston plate and the adjustment assembly are all located in the second groove section, and the piston push rod is passed through the sliding groove from the first groove section; wherein, the aperture of the first groove section is larger than the aperture of the second groove section, and a threaded structure is provided at one end of the second groove section close to the first groove section, and the fixing member is threadedly connected to the threaded structure.

[0011] In an exemplary embodiment of the present application, the ratio of the volume of the regulating medium to the volume of the containing chamber is greater than 90%.

[0012] In an exemplary embodiment of the present application, the bottom groove wall of the sliding groove is provided with an exhaust hole connecting the inside and outside of the sliding groove; and / or, the side groove wall of the sliding groove is provided with a protrusion, and the protrusion is located on the side of the piston push rod away from the piston plate along the first direction, and is arranged opposite to the piston plate along the first direction.

[0013] A second aspect of the present application discloses a vehicle, comprising a vehicle door, a mounting bracket and the buffer device, wherein the buffer device is connected to the vehicle door via the mounting bracket.

[0014] The beneficial effects of this application scheme are:

[0015] In an embodiment of the present application, when the buffer device is hit, the piston push rod will move toward the piston plate along the first direction and squeeze the regulating medium to move toward the piston plate. The regulating medium drives the movable part to move away from the first opening in the installation cavity along the first direction, so that the regulating medium can move toward the piston plate at a faster speed through the first opening and the second opening, and then can quickly transmit the pressure to the piston plate to squeeze the elastic part to absorb the pressure, thereby achieving the purpose of buffering the collision force received by the buffer device; further, the elastic restoring force of the elastic part after being squeezed will push the piston plate to move toward the piston push rod in the opposite direction, so that the regulating medium moves toward the piston push rod, and the regulating medium enters the installation cavity through the second opening, and drives the movable part to cover the first opening in the installation cavity along the first direction. Since the area of ​​the through hole is smaller than the area of ​​the first opening, compared with the piston push rod pushing the regulating medium to move toward the piston plate, the regulating medium can only move toward the piston push rod through the through hole at a slower speed until the piston push rod is pushed back to its original position, effectively avoiding the rapid rebound of the piston push rod of the buffer device after a collision.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of the buffer device in an embodiment of the present application is shown.

[0018] Figure 2 A front view of a buffer device in an embodiment of the present application is shown.

[0019] Figure 3 The present application embodiment is shown Figure 2 Cross-sectional view of the buffer device at AA.

[0020] Figure 4 A schematic diagram of the three-dimensional structure of the movable member in the embodiment of the present application when the movable member covers the first opening in the fixed member.

[0021] Figure 5 A schematic diagram of the three-dimensional structure of the movable member in the embodiment of the present application when the movable member is away from the first opening in the fixed member.

[0022] Figure 6 A schematic diagram of the three-dimensional structure of the cylinder in an embodiment of the present application is shown.

[0023] Figure 7 A schematic diagram of the three-dimensional structure of the elastic member in the embodiment of the present application is shown.

[0024] Figure 8 A schematic diagram of the three-dimensional structure of the piston plate in the embodiment of the present application is shown.

[0025] Fig. 9 A schematic diagram of the three-dimensional structure of the piston push rod in an embodiment of the present application is shown.

[0026] Fig.10 A schematic diagram of the three-dimensional structure of the fixing block in the embodiment of the present application is shown.

[0027] Fig.11 A three-dimensional structural schematic diagram of the movable parts in the embodiment of the present application is shown.

[0028] Fig.12 A schematic diagram of the three-dimensional structure of the cover plate in the embodiment of the present application is shown.

[0029] Fig.13 A schematic diagram of the three-dimensional structure of the buffer collision end in an embodiment of the present application is shown.

[0030] Fig.14 A schematic diagram of the structure in which the buffer device in an embodiment of the present application is fixed on a sliding door is shown.

[0031] Fig.15 A schematic diagram of the structure of the buffer device in an embodiment of the present application when it is fixed on the C-pillar and collides with the sliding door.

[0032] Among them, 1. cylinder; 101. sliding groove; 101a. first groove section; 101b. second groove section; 102. accommodating chamber; 103. exhaust hole; 2. elastic member; 3. piston assembly; 31. piston push rod; 32. piston plate; 4. adjusting assembly; 401. first opening; 402. second opening; 403. through hole; 404. installation chamber; 41. fixing member; 411. fixing block; 411a. first fixing section; 411b. second fixing section; 412. cover plate; 42. movable member; 43. adjusting medium; 5. buffer collision end; 6. sliding door; a. first direction; b. second direction; c. notch; d. side groove wall; e. bottom groove wall; f. raised portion. DETAILED DESCRIPTION

[0033] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0035] like Figures 1 to 15 As shown, this embodiment proposes a buffer device, including: a cylinder 1, an elastic member 2, a piston assembly 3 and an adjustment assembly 4, the cylinder 1 is provided with a sliding groove 101, the elastic member 2 is installed in the sliding groove 101, the piston assembly 3 includes a piston push rod 31 and a piston plate 32 both located in the sliding groove 101, the piston plate 32 is located between the elastic member 2 and the piston push rod 31, and a accommodating chamber 102 is formed between the piston push rod 31 and the piston plate 32.

[0036] In this embodiment, combined with Figure 3 As shown, the groove wall of the sliding groove 101 includes a bottom groove wall e and a side groove wall d, the bottom groove wall e is arranged opposite to the piston plate 32, and the side groove wall d is connected to the piston push rod 31 and the piston plate 32. The elastic member 2 is a spring, one end of the spring is connected to the bottom groove wall e of the sliding groove 101, and the other end is connected to the piston plate 32. The spring can be elastically deformed by moving the piston plate 32. The spring is mainly used to absorb the collision force received by the buffer device to achieve the buffering effect of the buffer device.

[0037] It should be understood that the material, pitch and thickness of the spring can be designed according to actual needs to ensure that the spring can offset the collision force exerted on the buffer device.

[0038] Furthermore, the adjustment component 4 includes a fixed part 41, a movable part 42 and an adjustment medium 43. The fixed part 41 is connected to the side groove wall d of the sliding groove 101 and is located between the piston push rod 31 and the piston plate 32. The fixed part 41 is provided with a mounting cavity 404. The mounting cavity 404 includes a first opening 401 and a second opening 402 connected to the accommodating cavity 102. The first opening 401 is closer to the piston push rod 31 than the second opening 402. The movable part 42 is arranged in the mounting cavity 404. The movable part 42 is provided with a through hole 403 that penetrates the movable part 42. The through hole 403 3 is arranged corresponding to the first opening 401, and the area of ​​the through hole 403 is smaller than the area of ​​the first opening 401; wherein, in the first direction a from the piston assembly 3 toward the elastic member 2: the orthographic projection of the first opening 401 in the sliding groove 101 is located within the orthographic projection of the movable member 42 in the sliding groove 101, and the orthographic projection of the through hole 403 in the sliding groove 101 is located within the orthographic projection of the first opening 401 in the sliding groove 101; the regulating medium 43 is located in the accommodating cavity 102, and is used to drive the movable member 42 to cover in the installation cavity 404 or to move away from the first opening 401.

[0039] In this embodiment, when the buffer device is hit, the piston push rod 31 moves toward the piston plate 32 along the first direction a and squeezes the regulating medium 43 to move toward the piston plate 32. The regulating medium 43 drives the movable member 42 to move in the mounting cavity 404 along the first direction a away from the first opening 401, so that the regulating medium 43 can move toward the piston plate 32 at a faster speed through the first opening 401 and the second opening 402, and then can quickly transfer the pressure to the piston plate 32 to squeeze the elastic member 2 to absorb the pressure, thereby achieving the purpose of buffering the collision force received by the buffer device; further, the elastic restoring force of the elastic member 2 after being squeezed will push the movable member 42 in the opposite direction. The piston plate 32 moves toward the piston push rod 31, causing the regulating medium 43 to move toward the piston push rod 31. The regulating medium 43 enters the installation cavity 404 through the second opening 402, and drives the movable part 42 to cover the first opening 401 along the first direction a in the installation cavity 404. Since the area of ​​the through hole 403 is smaller than the area of ​​the first opening 401, compared with when the piston push rod 31 pushes the regulating medium 43 toward the piston plate 32, the regulating medium 43 can only move toward the piston push rod 31 through the through hole 403 at a slower speed until the piston push rod 31 is pushed back to its original position, thereby effectively preventing the piston push rod 31 from rebounding quickly after the buffer device is hit.

[0040] It should be understood that both the piston plate 32 and the piston push rod 31 need to match the sliding groove 101 of the cylinder 1, to ensure that both the piston plate 32 and the piston push rod 31 can slide in the sliding groove 101 to ensure the normal use of the buffer device, and to ensure the sealing performance of the piston plate 32 and the piston push rod 31 when sliding in the sliding groove 101 to prevent leakage of the regulating medium 43 in the accommodating chamber 102.

[0041] Combination Figures 3 to 5 As shown, the fixing member 41 includes a fixing block 411 and a cover plate 412 which are arranged opposite to each other along a first direction a, the cover plate 412 is connected to the fixing block 411, the mounting cavity 404 is located between the cover plate 412 and the fixing block 411, the first opening 401 is arranged on the fixing block 411 along the first direction a, and the second opening 402 is arranged on the fixing block 411 along a second direction b intersecting with the first direction a; the movable member 42 is located between the cover plate 412 and the fixing block 411.

[0042] In this embodiment, the first direction a is the depth direction of the sliding groove 101 , and the second direction b is the radial direction of the sliding groove 101 .

[0043] It should be understood that neither the first direction a nor the second direction b is a vector direction.

[0044] In this embodiment, the cover plate 412 and the movable member 42 have the same shape and size, and the portion where the fixed block 411 and the cover plate 412 are connected is provided with threads. After the cover plate 412 and the fixed block 411 are screwed together, the movable member 42 will not fall out of the installation cavity 404 with the flow of the regulating medium 43, ensuring that the movable member 42 can move in the installation cavity 404, thereby ensuring that the buffering function of the buffer device can be normally exerted. In addition, the second opening 402 is provided in the fixed block 411 along the second direction b intersecting with the first direction a, so that when the movable member 42 moves in the installation cavity 404, the installation cavity 404 can always be connected with the accommodating cavity 102 at one end close to the piston plate 32, and will not affect the normal flow of the regulating medium 43.

[0045] It should be understood that the movable part 42 should slide along the first direction a in the installation cavity 404 without flipping, so that the buffer device can change the flow rate of the regulating medium 43 by changing the position of the movable part 42, thereby achieving the effect of absorbing collision force and effectively preventing rebound.

[0046] In this embodiment, combined with Figure 3 , Figure 4 and Figure 5 As shown, the second opening 402 is arranged around the fixed block 411 along the second direction b, so that when the movable part 42 moves along the first direction a in the installation cavity 404, the regulating medium 43 can still flow between the installation cavity 404 and the accommodating cavity 102 at one end close to the piston plate 32 through the second opening 402, without affecting the normal flow of the regulating medium 43.

[0047] In this embodiment, combined with Figures 3 to 5As shown, the second opening 402 includes a plurality of notches c, which are arranged in the fixing block 411 at intervals along the second direction b, and the spacing between two adjacent notches c is equal. The plurality of notches c allows the regulating medium 43 to flow quickly between the mounting cavity 404 and the accommodating cavity 102 near one end of the piston plate 32, thereby quickly transmitting the collision force to the piston plate 32, and buffering the collision force received through the elastic member 2; and the spacing between two adjacent notches c is equal, so that the regulating medium 43 can flow more evenly between the mounting cavity 404 and the accommodating cavity 102 near one end of the piston plate 32, and better achieve the buffering effect of the buffer device.

[0048] Combination Figure 3 As shown, the fixed block 411 includes a first fixed section 411a and a plurality of second fixed sections 411b which are arranged in sequence away from the piston push rod 31 along the first direction a. The first fixed section 411a is connected to the side groove wall d of the sliding groove 101, and is arranged to fit the side groove wall d of the sliding groove 101 along the second direction b. The plurality of second fixed sections 411b are arranged at intervals from each other along the second direction b, and are connected between the first fixed section 411a and the cover plate 412; the notch c is located between two adjacent second fixed sections 411b.

[0049] In this embodiment, the first fixed section 411a is connected to the side groove wall d of the sliding groove 101, so that the fixed block 411 will not move with the movement of the regulating medium 43, so as to ensure that the movable member 42 can move relative to the fixed block 411. Since the first fixed section 411a is closer to the piston push rod 31 than the second fixed section 411b, and the notch c is located between two adjacent second fixed sections 411b, the notch c is used to connect the installation cavity 404 with the accommodating cavity 102 near one end of the piston plate 32, and the first opening 401 is used to connect the installation cavity 404 with the accommodating cavity 102 near one end of the piston push rod 31, and the installation cavity 404 is connected with the accommodating cavity 102 through the notch c and the first opening 401.

[0050] In this embodiment, combined with Figures 3 to 5 As shown, the movable member 42 is located between the plurality of second fixing sections 411b and contacts the plurality of second fixing sections 411b. After the movable member 42 contacts the plurality of second fixing sections 411b, the second fixing sections 411b have a certain guiding effect on the movable member 42, so as to ensure that the movable member 42 can move in the installation cavity 404 along the plurality of second fixing sections 411b.

[0051] Combination Figure 3As shown, the sliding groove 101 includes a first groove section 101a and a second groove section 101b arranged along a first direction a, the elastic member 2, the piston plate 32, the fixing member 41 and the movable member 42 are all located in the second groove section 101b, and the piston push rod 31 is passed through the sliding groove 101 from the first groove section 101a; wherein, the aperture of the first groove section 101a is larger than the aperture of the second groove section 101b, and a threaded structure is provided at one end of the second groove section 101b close to the first groove section 101a, and the fixing member 41 is screwed to the threaded structure.

[0052] In this embodiment, the aperture of the first slot section 101a is larger than the aperture of the second slot section 101b to ensure that the fixing block 411 can be normally pushed into the second slot section 101b from the first slot section 101a; in addition, the movement of the piston push rod 31 can also be limited so that the piston push rod 31 can only move in the first slot section 101a and cannot enter the second slot section 101b, thereby preventing the piston push rod 31 from pushing the fixing member 41 when the buffer device is hit, thereby ensuring that the fixing member 41 can be fixed in the second slot section 101b.

[0053] In addition, a threaded structure is provided at one end of the second slot section 101b close to the first slot section 101a, and the fixing block 411 is screwed to the threaded structure, so that the fixing block 411 can be fixed in the second slot section 101b and will not move with the flow of the regulating medium 43.

[0054] It should be understood that the length of the thread structure provided in the second slot section 101 b only needs to be sufficient to ensure that the fixing block 411 and the second slot section 101 b are stably threaded together.

[0055] In this embodiment, combined with Figure 1 As shown, the buffer device further comprises a buffer collision end 5, which is located outside the cylinder 1 and is threadedly connected to the piston push rod 31. The buffer collision end 5 is used to receive the impact force received by the buffer device.

[0056] It should be understood that the collision buffer end 5 can be changed according to the shape of the structure that collides, and can be plastic-coated or covered with rubber according to actual use.

[0057] In this embodiment, the ratio of the volume of the regulating medium 43 to the volume of the accommodating chamber 102 is greater than 90%.

[0058] For example, the ratio of the volume of the regulating medium 43 to the volume of the containing chamber 102 can be 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc.

[0059] Preferably, the ratio of the volume of the regulating medium 43 to the volume of the accommodating chamber 102 is 100%, so as to better exert the buffering effect of the buffer device.

[0060] It should be understood that the regulating medium 43 is a fluid, and the specific material can be designed according to the flow rate of the fluid in the movable part 42 and the fixed block 411. It is recommended to use liquid filling, and the use of inert gas for filling can also be considered.

[0061] In this embodiment, combined with Figure 3 As shown, the bottom groove wall e of the sliding groove 101 is provided with an exhaust hole 103 communicating with the inside and outside of the sliding groove 101, and the exhaust hole 103 is used to exhaust the gas between the bottom groove of the sliding groove 101 and the piston plate 32 when the spring is compressed.

[0062] In this embodiment, combined with Figure 3 and Figure 6 As shown, a convex portion f is provided on the side groove wall d of the sliding groove 101, and the convex portion f is located on the side of the piston push rod 31 away from the piston plate 32 along the first direction a, and is arranged opposite to the piston plate 32 along the first direction a. The convex portion f is arranged opposite to the piston plate 32 along the first direction a to prevent the piston push rod 31 from falling out of the sliding groove 101, causing the buffer device to fail.

[0063] It should be understood that the protrusion f should be processed after all components of the buffer device are assembled to limit the movement of the piston push rod 31.

[0064] Combination Fig.14 As shown, this embodiment also provides a vehicle, including a vehicle door, a mounting bracket and the above-mentioned buffer device, wherein the buffer device is connected to the vehicle door via the mounting bracket.

[0065] In this embodiment, the vehicle door is a sliding door 6. The cylinder 1 is connected to the mounting bracket, and the buffer device is fixed to the inner plate of the sliding door 6 through the mounting bracket. When the sliding door 6 is opened to the maximum, the buffer collision end 5 will collide with the C-pillar of the vehicle body or the impact block on the C-pillar.

[0066] In other embodiments, in combination Fig.15 As shown, the cylinder 1 can be fixed on the C-pillar by a mounting bracket, and the buffer collision end 5 will collide with the sliding upper arm or lower arm of the sliding door 6.

[0067] In summary, the operating principle of the buffer device is as follows: when the buffer collision end 5 is impacted, the buffer collision end 5 will drive the piston push rod 31 to squeeze the regulating medium 43 filled in the accommodating chamber 102, and then the regulating medium 43 will push the movable part 42 to move along the first direction a close to the cover plate 412. At this time, the regulating medium 43 flows in the accommodating chamber 102 through the first opening 401 and the second opening 402. More regulating medium 43 passes through the mounting chamber 404 per unit time, and the pressure can be quickly transmitted to the piston plate 32, thereby compressing the spring for buffering; when the spring is compressed, the spring will push the piston plate 32 in the reverse direction, and the regulating medium 43 flows in the reverse direction and The movable part 42 is driven to slide to the first fixed section 411a and fit with the first fixed section 411a. At this time, the regulating medium 43 can only flow to the piston push rod 31 through the through hole 403 and the second opening 402. Since the area of ​​the through hole 403 is smaller than the area of ​​the first opening 401, less regulating medium 43 passes through the installation cavity 404 per unit time, so that the piston push rod 31 and the buffer collision end 5 return to their original positions at a slower speed, thereby achieving the effect of slow rebound of the sliding door 6 when the sliding door 6 is opened quickly, avoiding the sliding door 6 from closing itself due to the rapid rebound, so as to ensure that the sliding door 6 can stop normally and be limited in the open position under the limiting action of the mechanical structure.

[0068] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A buffer device, characterized in that: include: A cylinder, an elastic member, a piston assembly and an adjusting assembly, wherein the cylinder is provided with a sliding groove, the elastic member is installed in the sliding groove, the piston assembly comprises a piston push rod and a piston sheet both located in the sliding groove, the piston sheet is located between the elastic member and the piston push rod, and a receiving cavity is formed between the piston push rod and the piston sheet; the adjusting assembly comprises: A fixing member, the fixing member is connected to the inner wall of the sliding groove and is located between the piston push rod and the piston sheet, the fixing member is provided with a mounting cavity, the mounting cavity includes a first opening and a second opening communicating with the accommodating cavity, the first opening is closer to the piston push rod than the second opening; A movable member, the movable member is arranged in the installation cavity, the movable member is provided with a through hole penetrating the movable member, the through hole is arranged corresponding to the first opening, and the area of ​​the through hole is smaller than the area of ​​the first opening; wherein, from the piston assembly to the first direction of the elastic member: the orthographic projection of the first opening in the sliding groove is located within the orthographic projection of the movable member in the sliding groove, and the orthographic projection of the through hole in the sliding groove is located within the orthographic projection of the first opening in the sliding groove; A regulating medium is located in the accommodating cavity and is used to drive the movable member to seal in the installation cavity or to move away from the first opening.

2. The buffer device according to claim 1, characterized in that: The fixing member comprises a fixing block and a cover plate which are arranged opposite to each other along the first direction, the cover plate is connected to the fixing block, the mounting cavity is located between the cover plate and the fixing block, the first opening is arranged on the fixing block along the first direction, and the second opening is arranged on the fixing block along a second direction intersecting the first direction; The movable member is located between the cover plate and the fixed block.

3. The buffer device according to claim 2, characterized in that: The second opening is arranged around the fixing block along the second direction.

4. The buffer device according to claim 2, characterized in that: The second opening includes a plurality of notches, and the plurality of notches are arranged on the fixing block at intervals along the second direction, and the intervals between two adjacent notches are equal.

5. The buffer device according to claim 4, characterized in that: The fixing block comprises a first fixing section and a plurality of second fixing sections which are sequentially arranged away from the piston push rod along the first direction, the first fixing section is connected to the side groove wall of the sliding groove, and is arranged to be in close contact with the side groove wall of the sliding groove along the second direction, and the plurality of second fixing sections are arranged at intervals from each other along the second direction and are connected between the first fixing section and the cover plate; The notch is located between two adjacent second fixing sections.

6. The buffer device according to claim 5, characterized in that: The movable member is located between the plurality of second fixing sections and contacts the plurality of second fixing sections.

7. The buffer device according to claim 1, characterized in that: The sliding groove comprises a first groove section and a second groove section arranged along the first direction, the elastic member, the piston sheet and the adjustment assembly are all located in the second groove section, and the piston push rod passes through the sliding groove from the first groove section; wherein, The aperture of the first slot section is larger than that of the second slot section, a thread structure is provided at one end of the second slot section close to the first slot section, and the fixing piece is threadedly connected to the thread structure.

8. The buffer device according to claim 2, characterized in that: The ratio of the volume of the regulating medium to the volume of the containing chamber is greater than 90%.

9. The buffer device according to claim 2, characterized in that: The bottom groove wall of the sliding groove is provided with an exhaust hole communicating with the inside and outside of the sliding groove; and\or, A convex portion is provided on the side groove wall of the sliding groove, and the convex portion is located on a side of the piston push rod away from the piston plate along the first direction, and is arranged opposite to the piston plate along the first direction.

10. A vehicle, characterized in that: The invention comprises a vehicle door, a mounting bracket and the buffer device according to any one of claims 1 to 9, wherein the buffer device is connected to the vehicle door via the mounting bracket.

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