Hinge

Abstract

The utility model provides a hinge which enables a door leaf or a hinge and other mechanisms to be opened and closed more smoothly. The hinge comprises a pivot, a shell and a first buffer mechanism. The pivot is provided with a first cam surface. And the first buffer mechanism is arranged in the inner cavity of the shell. The first buffer mechanism comprises a first abutting piece and a first buffer connected with the first abutting piece. The front end of the first abutting piece is provided with a first rolling shaft and a containing groove, the axis of the first rolling shaft is parallel to the rotating axis, the first rolling shaft is arranged in the containing groove, the first abutting piece abuts against the first cam face through the rolling shaft face of the first rolling shaft, a second rolling shaft is installed on the side wall of the containing groove, and the second rolling shaft is arranged on the side wall of the containing groove. The rolling shaft face of the second rolling shaft protrudes out of the containing groove and makes contact with the rolling shaft face of the first rolling shaft.

Description

Technical Field

[0001] The utility model relates to a hinge, in particular to a hinge that can make mechanisms such as door leaves or hinges smoother when opening and closing. Background Art

[0002] Generally, a hinge includes a pivot and a buffer mechanism, which can be used to install door leaves (including glass doors or wooden doors, etc.) or hinges, etc., to achieve a buffering effect when the door leaf or hinge is opened or closed. The hinge realizes the buffering of mechanisms such as door leaves or hinges when opening and closing through the cooperation of a cam structure on the pivot and a buffer structure independent of the pivot. In the prior art, a guiding surface is provided at the end of the buffer structure, and the guiding surface abuts against the cam structure. When the cam structure rotates relative to the guiding surface, there will be relatively large friction, making it not smooth enough when opening and closing. Summary of the Utility Model

[0003] In view of this, it is necessary to provide a hinge that can make mechanisms such as door leaves or hinges smoother when opening and closing.

[0004] The utility model provides a hinge, which includes:

[0005] A pivot having a rotation axis, and a first cam surface circumferentially distributed around the rotation axis is provided on the pivot;

[0006] A housing having an inner cavity;

[0007] A first buffer mechanism disposed in the inner cavity, including: a first abutting member and a first buffer connected to the first abutting member; a first roller and a receiving groove are provided at the front end of the first abutting member, the axis of the first roller is parallel to the rotation axis, the first roller is disposed in the receiving groove, the first abutting member abuts against the first cam surface through the roller surface of the first roller, a second roller is installed on the side wall of the receiving groove, and the roller surface of the second roller protrudes into the receiving groove and contacts the roller surface of the first roller.

[0008] Further, the first buffer includes a first piston, a second piston and a hydraulic fluid. The first piston is disposed in front of the second piston. The hydraulic fluid is stored in a second space between the first piston and the second piston and a third space behind the second piston. The first piston is movably sleeved on the first abutting member, and the second piston is connected to the first abutting member.

[0009] Further, the first cam surface includes a first surface circumferentially located on the side of the first convex point. The first surface includes a first section connecting the first convex point and a second section connecting the first section and facing away from the first convex point;

[0010] The hinge further comprises:

[0011] a first flow rate regulator, comprising a first flow channel and a first valve needle provided on the housing, wherein the first valve needle is used for regulating the flow rate of the first flow channel;

[0012] a second flow rate regulator, comprising a second flow channel and a second valve needle provided on the housing, wherein the second valve needle is used for regulating the flow rate of the second flow channel;

[0013] wherein, along the axial direction of the housing, the rear port of the first flow channel is located between the front port of the second flow channel and the rear port of the second flow channel;

[0014] when the first abutting member abuts against the first section, the rear port of the first flow channel is not communicated with the third space, the front port of the second flow channel is communicated with the second space, and the rear port of the second flow channel is communicated with the third space;

[0015] when the first abutting member abuts against the second section, the front port of the first flow channel is communicated with the second space, the rear port of the first flow channel is communicated with the third space, and the front port of the second flow channel is not communicated with the second space.

[0016] Further, a second cam surface circumferentially distributed around the rotation axis is provided on the pivot shaft, the first cam surface and the second cam surface are at different axial positions of the pivot shaft, and the first bump of the first cam surface and the second bump of the second cam surface are at different circumferential angles of the pivot shaft;

[0017] The hinge further comprises a second buffer mechanism, the second buffer mechanism is provided in the inner cavity and comprises: a second abutting member abutting against the second cam surface and a second buffer connected to the second abutting member.

[0018] Further, the second cam surface comprises a second surface circumferentially located on one side of the second bump and a third surface circumferentially located on the other side of the second bump;

[0019] when the first abutting member abuts against the first section, the second abutting member abuts against the second surface; when the first abutting member abuts against the second section, the second abutting member abuts against the third surface.

[0020] Further, the first buffer further comprises a second spring, the second spring is located in the third space and the second spring abuts against the second piston, and a one-way valve for allowing the hydraulic fluid to flow from the second space to the third space is provided on the second piston or on the first abutting member.

[0021] Further, the one-way valve includes a third flow channel and a valve ball. The third flow channel is provided on the first abutting member. The third flow channel communicates with the second space and the third space. The valve ball is restricted in the third flow channel.

[0022] Further, the one-way valve includes a through hole provided on the second piston and a diaphragm provided behind the second piston.

[0023] Further, the first buffer further includes a third spring. The third spring abuts against the first piston and is located in front of the first piston.

[0024] Further, there are two or more second rollers.

[0025] The first buffer mechanism of the present utility model includes a first abutting member and a first buffer connected to the first abutting member; the front end of the first abutting member has a first roller and a receiving groove. The axis of the first roller is parallel to the rotation axis. The first roller is provided in the receiving groove. The first abutting member abuts against the first cam surface through the roller surface of the first roller. A second roller is installed on the side wall of the receiving groove. The roller surface of the second roller protrudes in the receiving groove and contacts the roller surface of the first roller. Through this structural design, when the pivot rotates, the first cam surface will drive the first roller to rotate in the receiving groove. The second roller can make the rotation of the first roller more stable and is beneficial to reducing the rotational friction of the first roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the first specific embodiment of the present utility model.

[0027] Figure 2 is Figure 1 a cross-sectional view.

[0028] Figure 3 is Figure 1 an exploded schematic diagram after removing the housing.

[0029] Figure 4 is a cross-sectional view of the pivot of the first specific embodiment of the present utility model at the first cam surface.

[0030] Figure 5 is a cross-sectional view of the pivot of the first specific embodiment of the present utility model at the second cam surface.

[0031] Figure 6 is Figure 3 a top view of the second abutting member in

[0032] Figure 7Schematic diagram of the first flow rate regulator and the second flow rate regulator of the first specific embodiment.

[0033] Figure 8 Partial schematic diagram of the second specific embodiment of the present utility model. Specific embodiment

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection methods.

[0035] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. It should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in specific situations. The terms used in the description of the present utility model in this article are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0036] It should also be noted that in the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] Please refer to Figures 1-3As shown, a specific embodiment of the present utility model provides a hinge 100, which includes a pivot 10, a housing 20, a first buffer mechanism 30, and a second buffer mechanism 40.

[0038] The pivot 10 has a rotation axis X, and the housing 20 has an axis Y. Along the axis Y, the housing 20 has opposite front and rear ends. The front and rear ends of the housing 20 are closed by end caps 21, and the end caps 21 are provided with mounting portions 211, and the hinge 100 is fixed to the ground or the door frame through the mounting portions 211.

[0039] The pivot 10 is installed at a position in front of the housing 20. The pivot 10 is installed in the housing 20 through a plurality of bearings 101, so that the pivot 10 can rotate around the rotation axis X, and the connecting portion 102 of the pivot 10 extending out of the housing 20 is used to connect mechanisms such as a door leaf or a hinge.

[0040] Combined Figures 3-5 As shown, a first cam surface 11 and a second cam surface 12 are provided on the pivot 10, and the first cam surface 11 and the second cam surface 12 are at different axial positions of the pivot 10.

[0041] The first buffer mechanism 30 and the second buffer mechanism 40 are arranged in the inner cavity 22 of the housing 20.

[0042] The first buffer mechanism 30 abuts against the first cam surface 11, and the second buffer mechanism 40 abuts against the second cam surface 12.

[0043] Among them, the first cam surface 11 includes a first bump 111 and a first surface 112 located circumferentially on the side of the first bump 111. The second cam surface 12 includes a second bump 121, a second surface 122 located circumferentially on one side of the second bump 121, a third surface 123 located circumferentially on the other side of the second bump 121, and the second cam surface 12 may further include a first positioning groove 124 located circumferentially on one side of the third surface 123 and facing away from the second bump 121.

[0044] The first surface 112 of the first cam surface 11 may include a first section 1121 connecting the first bump 111 and a second section 1122 connecting the first section 1121 and facing away from the first bump 111.

[0045] Wherein, the first bump 111 and the second bump 121 are at different circumferential angles of the pivot 10, that is, when the first bump 111 abuts against the first buffer mechanism 30, the second bump 121 does not abut against the second buffer mechanism 40, and when the second bump 121 abuts against the second buffer mechanism 40, the first bump 111 does not abut against the first buffer mechanism 30.

[0046] During installation, mechanisms such as the door leaf or hinge can be installed on the connecting portion 102 at the following angles: when the first buffer mechanism 30 abuts against the first bump 111, the door leaf or hinge and other mechanisms are in a closed state. When the first buffer mechanism 30 gradually moves away from the first bump 111 along the first surface 112, the door leaf or hinge and other mechanisms are gradually opened until the second buffer mechanism 40 abuts against the first positioning groove 124. At this time, the door leaf or hinge and other mechanisms are opened to the maximum angle (for example, 90°). Alternatively, mechanisms such as the door leaf or hinge can also be installed on the connecting portion 102 at the following angles: when the first buffer mechanism 30 abuts against the first bump 111, the door leaf or hinge and other mechanisms are in a fully open state. When the first buffer mechanism 30 gradually moves away from the first bump 111 along the first surface 112, the door leaf or hinge and other mechanisms are gradually closed until the second buffer mechanism 40 abuts against the first positioning groove 124. At this time, the door leaf or hinge and other mechanisms are in a closed state.

[0047] Taking the case where the first buffer mechanism 30 abuts against the first bump 111 and at this time the door leaf or hinge and other mechanisms are in a closed state as an example for description.

[0048] When the first buffer mechanism 30 abuts against the first bump 111, the door leaf or hinge and other mechanisms are in a closed state, and the first buffer mechanism 30 is compressed. At this time, the second buffer mechanism 40 abuts against the second surface 122. When the first buffer mechanism 30 gradually moves away from the first bump 111 along the first surface 112, the door leaf or hinge and other mechanisms are gradually opened, and the first buffer mechanism 30 is gradually released. At this time, the second buffer mechanism 40 gradually moves along the second surface 122 towards the second bump 121 and until it contacts the second bump 121, and the second buffer mechanism 40 is compressed. Then the second buffer mechanism 40 passes over the second bump 121 and gradually moves along the third surface 123 towards the first positioning groove 124, and the second buffer mechanism 40 is gradually released.

[0049] In this embodiment, the first cam surface 11 includes two first surfaces 112 which are arranged on the sides of the first bump 111 and can be symmetrically arranged. In this embodiment, the second cam surface 12 includes two second bumps 121. On both sides of each second bump 121, there are respectively a second surface 122 and a third surface 123. On one side of each third surface 123 and facing away from the corresponding second bump 121, there is provided the first positioning groove 124. The second surfaces 122 corresponding to the two second bumps 121 are joined to form the second positioning groove 125. When the door leaf or hinge and other mechanisms are in the closed state, the second buffer mechanism 40 is positioned in the second positioning groove 125.

[0050] At this time, the door leaf or hinge and other mechanisms can be rotated to one side to be opened to the maximum angle (for example, 90°), and the door leaf or hinge and other mechanisms can also be rotated to the other side and can be opened to the maximum angle (for example, 90°).

[0051] When the door leaf or hinge and other mechanisms are in the closed state, the connection line Z between the first bump 111 and the rotation axis X coincides with the axis Y.

[0052] The first bump 111 on one side of the connection line Z, and the corresponding second surface 122 and the third surface 123 are mirror-symmetrical with respect to the connection line Z to the first bump 111 on the other side of the connection line Z and the corresponding second surface 122 and the third surface 123.

[0053] Continue to refer to Figure 2 and Figure 3 As shown, the first buffer mechanism 30 includes a first abutting member 31 abutting against the first cam surface 11 and a first buffer 32 connected to the first abutting member 31. The second buffer mechanism 40 includes a second abutting member 41 abutting against the second cam surface 12 and a second buffer 42 connected to the second abutting member 41 and located behind the second abutting member 41 and in front of the first buffer 32. The second buffer 42 preferably includes a first spring sleeved outside the first abutting member 31.

[0054] Both the first abutting member 31 and the second abutting member 41 are slidably connected to the inner cavity 22, and the first abutting member 31 and the second abutting member 41 can slide relative to each other back and forth. Specifically, the first abutting member 31 includes a top rod 301, and the second abutting member 41 includes a sleeve 401. The top rod 301 is placed in the sleeve 401 and is slidably connected to the sleeve 401.

[0055] Refer to Figure 3 and Figure 6As shown, the front end of the second abutting member 41 has a first roller 411, and the axis of the first roller 411 is parallel to the rotation axis X. Specifically, the front end of the second abutting member 41 has a receiving groove 412, the first roller 411 is disposed in the receiving groove 412, the roller surface of the first roller 411 protrudes from the front end of the second abutting member 41, and the second abutting member 41 abuts against the second cam surface 12 through the first roller 411. A second roller 413 is mounted on the side wall of the receiving groove 412. The number of the second rollers 413 can be two or more. The diameter of the second roller 413 is smaller than that of the first roller 411. The roller surface of the second roller 413 protrudes in the receiving groove 412 and contacts the roller surface of the first roller 411. When the pivot 10 rotates, the second cam surface 12 drives the first roller 411 to rotate in the receiving groove 412. The second roller 413 can make the rotation of the first roller 411 more stable and is beneficial to reducing the rotational friction of the first roller 411.

[0056] The front end of the first abutting member 31 has a third roller 311, the axis of the third roller 311 is parallel to the rotation axis X, and the third roller 311 can move longitudinally along the axis Y. Specifically, the front end of the first abutting member 31 has a longitudinal groove 312, the third roller 311 is disposed in the longitudinal groove 312, the roller surface of the third roller 311 protrudes from the front end of the first abutting member 31, and the first abutting member 31 abuts against the first cam surface 11 through the third roller 311. When the pivot 10 rotates, the first cam surface 11 drives the third roller 311 to move longitudinally and rotate in the longitudinal groove 312.

[0057] It can be understood that the above-mentioned first roller 411, receiving groove 412 and second roller 413 and their corresponding assembly methods can also be correspondingly arranged at the front end of the first abutting member 31 to replace the third roller 311, longitudinal groove 312 and their corresponding assembly methods. Similarly, the above-mentioned third roller 311, longitudinal groove 312 and their corresponding assembly methods can also be arranged at the front end of the second abutting member 41 to replace the first roller 411, receiving groove 412 and second roller 413 and their corresponding assembly methods. For more specific setting methods, reference can be made to the above, and details will not be repeated here.

[0058] The rear end of the first abutting member 31 passes over the rear end of the second abutting member 41 and extends rearward, and the second buffer 42 is disposed in the first space A between the first abutting member 31 and the housing 20. The first buffer mechanism 30 and the second buffer mechanism 40 partially overlap in the axial direction Y, thereby reducing the volume or length of the hinge 100, thereby reducing the installation space of the hinge 100.

[0059] A collar 23 movably sleeved on the first abutting member 31 is provided in the inner cavity 22 . The collar 23 can move forward relative to the housing 20 . The rear end of the second buffer 42 abuts against the front side of the collar 23 .

[0060] In a first specific embodiment, the first buffer 32 may specifically include a first piston 321, a second piston 322, and a hydraulic fluid. The first piston 321 is disposed in front of the second piston 322, the hydraulic fluid is stored in a second space B between the first piston 321 and the second piston 322 and a third space C behind the second piston 322, the first piston 321 is movably sleeved on the first abutting member 31, and the second piston 322 is connected to the first abutting member 31.

[0061] When the first cam surface 11 drives the first resisting member 31 to move backward, the first resisting member 31 will squeeze the second piston 322 , and a buffering effect is achieved under the pressure of the hydraulic fluid.

[0062] It is understandable that, for ease of installation, the first abutment 31 may be split, that is, the first abutment 31 may be formed by connecting a plurality of independent units in sequence. The unit at the rear end may be an integral structure with the second piston 322, or the unit at the rear end may be fixedly connected to the second piston 322.

[0063] See also Figure 7 As shown, a first flow rate regulator 50 and a second flow rate regulator 60 are provided on the housing 20. The first flow rate regulator 50 includes a first flow channel 51 and a first valve needle 52, and the first valve needle 52 is used to adjust the flow of the first flow channel 51. The second flow rate regulator 60 includes a second flow channel 61 and a second valve needle 62, and the second valve needle 62 is used to adjust the flow of the second flow channel 61.

[0064] The first valve needle 52 and the second valve needle 62 are disposed parallel to the axis Y, and the rear ends of the first valve needle 52 and the second valve needle 62 have a shifting tooth exposed from the housing 20 .

[0065] Axially on the Y-axis, the rear port 512 of the first flow channel 51 is located between the front port 611 and the rear port 612 of the second flow channel 61.

[0066] Preferably, when the second buffer mechanism 40 moves along the second surface 122, the first buffer mechanism 30 moves along the first section 1121. When the second buffer mechanism 40 moves along the third surface 123, the first buffer mechanism 30 moves along the second section 1122. When the first buffer mechanism 30 moves along the first section 1121, mechanisms such as the door leaf or hinge rotate by a first rotation angle (e.g., 20°). When the first buffer mechanism 30 moves along the second section 1122, mechanisms such as the door leaf or hinge rotate by a second rotation angle (e.g., 70°).

[0067] When the first abutting member 31 abuts against the first section 1121, the rear port 512 of the first flow channel 51 is not in communication with the third space C (it can be that the rear port 512 is closed by the second piston 322 or the rear port 512 communicates with the second space B). The front port 511 of the first flow channel 51 remains in communication with the second space B, while the front port 611 of the second flow channel 61 communicates with the second space B, and the rear port 612 of the second flow channel 61 communicates with the third space C. At this time, the first flow rate regulator 50 does not come into effect, and the second space B and the third space C are in communication through the second flow channel 61, achieving hydraulic balance between the second space B and the third space C.

[0068] When the first abutting member 31 abuts against the second section 1122, the front port 511 of the first flow channel 51 communicates with the second space B, and the rear port 512 of the first flow channel 51 communicates with the third space C. While the front port 611 of the second flow channel 61 is not in communication with the second space B (it can be that the front port 611 is closed by the second piston 322 or the front port 611 communicates with the third space C), and the rear port 612 of the second flow channel 61 remains in communication with the third space C. At this time, the second flow rate regulator 60 does not come into effect, and the second space B and the third space C are in communication through the first flow channel 51, achieving hydraulic balance between the second space B and the third space C.

[0069] Thus, the flow rate of the first flow channel 51 can be adjusted respectively by the first valve needle 52, and the flow rate of the second flow channel 61 can be adjusted by the second valve needle 62, achieving different buffering forces at the first rotation angle and the second rotation angle, and making it more comfortable when opening and closing the door.

[0070] Continue to refer to Figure 2 and Figure 3, the first buffer 32 may include a second spring 323, the second spring 323 is located in the third space C and the second spring 323 abuts against the second piston 322. The second spring 323 may buffer the first abutting member 31 together with the hydraulic fluid in the third space C.

[0071] A third piston 324 may be provided at the rear end of the inner cavity 22. The rear end of the second spring 323 abuts against the third piston 324. A regulating screw rod 3241 is connected to the rear side of the third piston 324. The regulating screw rod 3241 is connected to the end cover 21 at the rear end of the housing 20. By screwing the regulating screw rod 3241, the front-back position of the third piston 324 in the inner cavity 22 can be changed, so that the buffering force of the first buffer 32 can be adjusted.

[0072] A one-way valve 70 through which the hydraulic fluid can flow from the second space B to the third space C is provided on the first abutting member 31.

[0073] Specifically, the one-way valve 70 includes a third flow channel 71 and a valve ball 72. The third flow channel 71 is provided on the first abutting member 31. The third flow channel 71 communicates the second space B and the third space C. The valve ball 72 is restricted in the third flow channel 71 by a retaining piece 73 provided behind the second piston 322. When the hydraulic fluid flows from the second space B to the third space C, the valve ball 72 opens the third flow channel 71. When the hydraulic fluid wants to flow from the third space C to the second space B, the hydraulic fluid will cause the valve ball 72 to block the third flow channel 71.

[0074] In other embodiments, a one-way valve 70 through which the hydraulic fluid can flow from the second space B to the third space C may also be provided separately on the second piston 322. The one-way valve 70 may include a through hole opened on the second piston 322 and a diaphragm provided behind the second piston 322.

[0075] The first buffer 32 may include a third spring 325. The front end of the third spring 325 abuts against the rear side of the collar 23. The third spring 325 abuts against the first piston 321 and is located in front of the first piston 321. The third spring 325 can squeeze the first piston 321 so that the hydraulic pressure in the second space B is maintained at a certain pressure.

[0076] In the second specific embodiment, as Figure 8As shown, the difference from the first specific embodiment lies in that a first cam surface 11 and two second cam surfaces 12 are provided on the pivot 10. Axially, the first cam surface 11 is located between the two second cam surfaces 12. The second abutting member 41 includes two first lugs 41a extending forward and spaced apart, and one of the first lugs 41a is used to abut against one of the first cam surfaces 11. The first abutting member 31 includes a second lug 31a extending forward, and the second lug 31a is located between the two first lugs 41a. Similarly, the third roller 311, the longitudinal groove 312 and their corresponding assembly methods as shown in the first specific embodiment or the first roller 411, the receiving groove 412 and the second roller 413 and their corresponding assembly methods as shown can also be provided on the first lug 41a. The third roller 311, the longitudinal groove 312 and their corresponding assembly methods as shown in the first specific embodiment or the first roller 411, the receiving groove 412 and the second roller 413 and their corresponding assembly methods as shown can also be provided on the second lug 31a, which will not be specifically described herein.

[0077] In the description and claims of this application, the words "comprise / include" and their variants are used to specify the presence of the stated features, values, steps or components, but do not exclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0078] Some features of the present utility model are described separately in different embodiments for clarity. However, these features can also be combined and described in a single embodiment. On the contrary, some features of the present utility model are described only in a single embodiment for brevity. However, these features can also be described separately or in any suitable combination in different embodiments.

[0079] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A hinge, characterized in that: The hinge comprises: A pivot shaft, the pivot shaft having a rotation axis, the pivot shaft being provided with a first cam surface distributed circumferentially around the rotation axis; a housing having an inner cavity; A first buffer mechanism, which is arranged in the inner cavity, includes: a first supporting member and a first buffer connected to the first supporting member; a first roller and a receiving groove are provided at the front end of the first supporting member, the axis of the first roller is parallel to the rotation axis, the first roller is arranged in the receiving groove, the first supporting member abuts against the first cam surface through the roller surface of the first roller, a second roller is installed on the side wall of the receiving groove, the roller surface of the second roller protrudes from the receiving groove and contacts with the roller surface of the first roller.

2. The hinge according to claim 1, characterized in that: The first buffer includes a first piston, a second piston and a hydraulic fluid. The first piston is arranged in front of the second piston. The hydraulic fluid is stored in a second space between the first piston and the second piston and a third space behind the second piston. The first piston is movably mounted on the first supporting member, and the second piston is connected to the first supporting member.

3. The hinge according to claim 2, characterized in that: The first cam surface comprises a first surface located at a side of the first protrusion along the circumferential direction, the first surface comprises a first section connected to the first protrusion and a second section connected to the first section and facing away from the first protrusion; The hinge also includes: A first flow rate regulator, comprising a first flow channel and a first valve needle provided on the housing, wherein the first valve needle is used to adjust the flow rate of the first flow channel; A second flow rate regulator, comprising a second flow channel and a second valve needle provided on the housing, wherein the second valve needle is used to adjust the flow rate of the second flow channel; Wherein, along the axial direction of the shell, the rear port of the first flow channel is located between the front port of the second flow channel and the rear port of the second flow channel; When the first abutting member abuts against the first section, the rear port of the first flow channel is not connected to the third space, the front port of the second flow channel is connected to the second space, and the rear port of the second flow channel is connected to the third space; When the first abutting member abuts against the second section, the front port of the first flow channel is connected to the second space, the rear port of the first flow channel is connected to the third space, and the front port of the second flow channel is not connected to the second space.

4. The hinge according to claim 3, characterized in that: The pivot is provided with a second cam surface circumferentially distributed around the rotation axis, the first cam surface and the second cam surface are located at different axial positions of the pivot, and the first convex point of the first cam surface and the second convex point of the second cam surface are at different circumferential angles of the pivot; The hinge further includes a second buffer mechanism, which is disposed in the inner cavity and includes a second abutting member abutting against the second cam surface and a second buffer connected to the second abutting member.

5. The hinge according to claim 4, characterized in that: The second cam surface includes a second surface located on one side of the second convex point along the circumferential direction and a third surface located on the other side of the second convex point along the circumferential direction; When the first abutting member abuts against the first section, the second abutting member abuts against the second surface; when the first abutting member abuts against the second section, the second abutting member abuts against the third surface.

6. The hinge according to claim 2, characterized in that: The first buffer further includes a second spring, which is located in the third space and abuts against the second piston. A one-way valve is provided on the second piston or on the first abutting member, which allows the hydraulic fluid to flow from the second space to the third space.

7. The hinge according to claim 6, characterized in that: The one-way valve comprises a third flow channel and a valve ball. The third flow channel is arranged on the first abutting member, the third flow channel is connected with the second space and the third space, and the valve ball is confined in the third flow channel.

8. The hinge according to claim 6, characterized in that: The one-way valve comprises a through hole formed on the second piston and a diaphragm disposed behind the second piston.

9. The hinge according to claim 2, characterized in that: The first buffer further includes a third spring, the third spring abuts against the first piston and is located in front of the first piston.

10. The hinge according to claim 1, characterized in that The second rollers include two or more.

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