Hinge

Abstract

The utility model provides a hinge capable of reducing installation space. The hinge comprises a pivot, a shell, a first buffer mechanism and a second buffer mechanism. The pivot is provided with a first cam surface and a second cam surface. The first buffering mechanism and the second buffering mechanism are arranged in an inner cavity of the shell. The first buffer mechanism comprises a first abutting piece abutting against the first cam face and a first buffer connected with the first abutting piece. The second buffer mechanism comprises a second abutting piece abutting against the second cam face and a second buffer connected with the second abutting piece and located behind the second abutting piece and in front of the first buffer. The first abutting piece and the second abutting piece can relatively slide front and back, the rear end of the first abutting piece backwards crosses the rear end of the second abutting piece and extends backwards, and the second buffer is arranged in a first space between the first abutting piece and the shell.

Description

Technical Field

[0001] The present invention relates to a hinge, and particularly to a hinge with a relatively small installation space. Background Art

[0002] A hinge generally includes a pivot and a buffer mechanism, which can be used to install a door leaf (including a glass door or a wooden door, etc.) or a hinge, etc., so as to achieve a buffering effect when the door leaf or the hinge is opened or closed. Some hinges are provided with two sets of buffer mechanisms, and the cooperation of the two sets of buffer mechanisms realizes buffering when opening or closing. Such hinges are large in volume or long in length, occupy a relatively large space during installation, and may not be installable in some scenarios. Summary of the Invention

[0003] In view of this, it is necessary to provide a hinge with a relatively small installation space.

[0004] The present invention provides a hinge, which includes:

[0005] A pivot, on which a first cam surface and a second cam surface are provided. The first cam surface and the second cam surface are at different axial positions of the pivot, and a first convex point of the first cam surface and a second convex point of the second cam surface are at different circumferential angles of the pivot;

[0006] A housing, which has opposite front and rear sides. The pivot is close to the front, and the housing has an inner cavity;

[0007] A first buffer mechanism, which is arranged in the inner cavity and includes: a first abutting member abutting against the first cam surface and a first buffer connected to the first abutting member;

[0008] A second buffer mechanism, which is arranged 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 and located behind the second abutting member and in front of the first buffer;

[0009] Wherein, the first abutting member and the second abutting member can slide relatively back and forth, the rear end of the first abutting member extends backward beyond the rear end of the second abutting member, and the second buffer is arranged in a first space between the first abutting member and the housing.

[0010] Further, the second buffer includes a first spring sleeved outside the first abutting member.

[0011] 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.

[0012] Further, the first cam surface includes a first surface circumferentially located on the side of the first bump. The first surface includes a first section connecting the first bump and a second section connecting the first section and facing away from the first bump.

[0013] The hinge further includes:

[0014] A first flow rate regulator, including a first flow channel and a first valve needle disposed on the housing. The first valve needle is used to regulate the flow rate of the first flow channel.

[0015] A second flow rate regulator, including a second flow channel and a second valve needle disposed on the housing. The second valve needle is used to regulate the flow rate of the second flow channel.

[0016] Wherein, along the axial direction of the housing, the rear port of the first flow channel is located between the front port and the rear port of the second flow channel.

[0017] 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.

[0018] 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.

[0019] Further, the second cam surface includes 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.

[0020] 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.

[0021] Further, the first buffer further includes a second spring. The second spring is located in the third space and the second spring abuts against the second piston. 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 the first abutting member.

[0022] 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, and the third flow channel communicates with the second space and the third space. The valve ball is restricted in the third flow channel; alternatively, the one-way valve includes a through hole opened on the second piston and a diaphragm provided behind the second piston.

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

[0024] Further, the hinge further includes a collar. The collar is movably sleeved on the first abutting member. The rear end of the second buffer abuts against the front side of the collar, and the front end of the third spring abuts against the rear side of the collar.

[0025] Further, the first abutting member includes a push rod, and the second abutting member includes a sleeve. The push rod is placed in the sleeve and is slidably connected to the sleeve.

[0026] The present invention has the following beneficial effects: The first abutting member and the second abutting member can slide relatively back and forth. The rear end of the first abutting member extends backward beyond the rear end of the second abutting member. The second buffer is provided in the first space between the first abutting member and the housing. There will be partial spatial overlap between the first buffer mechanism and the second buffer mechanism in the axial direction of the housing, so that the volume or length of the hinge can be reduced, and further the installation space of the hinge can be reduced. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the first specific embodiment of the present invention.

[0028] Figure 2 is Figure 1 a cross-sectional view.

[0029] Figure 3 is Figure 1 an exploded schematic diagram after removing the housing.

[0030] Figure 4 is a cross-sectional view of the pivot of the first specific embodiment of the present invention at the first cam surface.

[0031] Figure 5 is a cross-sectional view of the pivot of the first specific embodiment of the present invention at the second cam surface.

[0032] Figure 6 is Figure 3 a top view of the second abutting member in

[0033] Figure 7 Schematic structural diagram of the first flow rate regulator and the second flow rate regulator of the first specific embodiment.

[0034] Figure 8 Partial structural schematic diagram of the second specific embodiment of the present invention. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present invention. The connection relationships shown in the drawings are only for clear description and do not limit the connection methods.

[0036] 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 invention 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 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 invention can be understood in specific situations. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] It should also be noted that in the description of the present invention, 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 invention 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 invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] Please refer to Figures 1-3 As shown, the specific embodiment of the present invention provides a hinge 100, and the hinge 100 includes a pivot 10, a housing 20, a first buffer mechanism 30, and a second buffer mechanism 40.

[0039] 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.

[0040] The pivot 10 is installed at a position closer to the 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.

[0041] Combined Figures 3-5 As shown, a first cam surface 11 and a second cam surface 12 are circumferentially provided on the pivot 10 around the rotation axis X, and the first cam surface 11 and the second cam surface 12 are at different axial positions of the pivot 10.

[0042] The first buffer mechanism 30 and the second buffer mechanism 40 are arranged in the inner cavity 22 of the housing 20.

[0043] 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.

[0044] Wherein, the first cam surface 11 includes a first bump 111 and a first surface 112 circumferentially located on the side of the first bump 111. The second cam surface 12 includes a second bump 121, a second surface 122 circumferentially located on one side of the second bump 121, a third surface 123 circumferentially located on the other side of the second bump 121, and the second cam surface 12 may further include a first positioning groove 124 circumferentially located on one side of the third surface 123 and facing away from the second bump 121.

[0045] 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.

[0046] 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.

[0047] During installation, mechanisms such as the door leaf or hinge can be installed at 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 mechanism is 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 mechanism is gradually opened until the second buffer mechanism 40 abuts against the first positioning groove 124, at which point the door leaf or hinge mechanism is opened to the maximum angle (e.g., 90°). Alternatively, mechanisms such as the door leaf or hinge can also be installed at 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 mechanism is 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 mechanism is gradually closed until the second buffer mechanism 40 abuts against the first positioning groove 124, at which point the door leaf or hinge mechanism is in a closed state.

[0048] Taking the case where the first buffer mechanism 30 abuts against the first bump 111 and the door leaf or hinge mechanism is in a closed state as an example for illustration.

[0049] When the first buffer mechanism 30 abuts against the first bump 111, the door leaf or hinge mechanism is 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 mechanism is 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 crosses 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.

[0050] 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, a second surface 122 and a third surface 123 are respectively provided. On one side of each third surface 123 and facing away from the corresponding second bump 121, a first positioning groove 124 is provided. The second surfaces 122 corresponding to the two second bumps 121 are connected to form a second positioning groove 125. When the door leaf or hinge and other mechanisms are in a closed state, the second buffer mechanism 40 is positioned in the second positioning groove 125.

[0051] 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°).

[0052] When the door leaf or hinge and other mechanisms are in a closed state, the connection line Z between the first bump 111 and the rotation axis X coincides with the axis Y.

[0053] The first bump 111 on one side of the connection line Z and the corresponding second surface 122 and third surface 123 are mirror-symmetrical with the first bump 111 on the other side of the connection line Z and the corresponding second surface 122 and third surface 123 with respect to the connection line Z.

[0054] 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.

[0055] 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 push rod 301, and the second abutting member 41 includes a sleeve 401. The push rod 301 is placed in the sleeve 401 and is slidably connected to the sleeve 401.

[0056] 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, and the roller surface of the first roller 411 protrudes from the front end of the second abutting member 41. The second abutting member 41 abuts against the second cam surface 12 through the roller surface of the first roller 411. A second roller 413 is installed 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 into 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.

[0057] The front end of the first abutting member 31 has a third roller 311, and the axis of the third roller 311 is parallel to the rotation axis X. 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, and the roller surface of the third roller 311 protrudes from the front end of the first abutting member 31. The first abutting member 31 abuts against the first cam surface 11 through the roller surface of 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.

[0058] 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 the more specific setting methods, reference can be made to the above, and details will not be elaborated here.

[0059] 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.

[0060] 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 .

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 .

[0066] Axially along 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.

[0067] Preferably, when the second buffer mechanism 40 moves along the second surface 122, the first buffer mechanism 30 moves along the first section 1121, and 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°), and 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°).

[0068] When the first abutting member 31 abuts against the first section 1121, the rear port 512 of the first flow channel 51 is not connected to the third space C (it can be that the rear port 512 is closed by the second piston 322 or the rear port 512 is connected to the second space B), the front port 511 of the first flow channel 51 remains connected to the second space B, the front port 611 of the second flow channel 61 is connected to the second space B, and the rear port 612 of the second flow channel 61 is connected to the third space C. At this time, the first flow rate regulator 50 does not take effect, and the second space B and the third space C are connected through the second flow channel 61 to achieve hydraulic balance between the second space B and the third space C.

[0069] When the first abutting member 31 abuts against the second section 1122, the front port 511 of the first flow channel 51 is connected to the second space B, the rear port 512 of the first flow channel 51 is connected to the third space C, and the front port 611 of the second flow channel 61 is not connected to the second space B (it can be that the front port 611 is closed by the second piston 322 or the front port 611 is connected to the third space C), and the rear port 612 of the second flow channel 61 remains connected to the third space C. At this time, the second flow rate regulator 60 does not take effect, and the second space B and the third space C are connected through the first flow channel 51 to achieve hydraulic balance between the second space B and the third space C.

[0070] Thus, the flow rate of the first flow channel 51 can be adjusted 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 respectively, to achieve different buffer forces at the first rotation angle and the second rotation angle, making it more comfortable when opening and closing the door.

[0071] 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.

[0072] 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 lead screw 3241 is connected to the rear side of the third piston 324. The regulating lead screw 3241 is connected to the end cover 21 at the rear end of the housing 20. By screwing the regulating lead screw 3241, the front - rear position of the third piston 324 in the inner cavity 22 can be changed, thereby the buffering force of the first buffer 32 can be adjusted.

[0073] A one - way valve 70 for the hydraulic fluid to flow from the second space B to the third space C is provided on the first abutting member 31.

[0074] 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 attempts to flow from the third space C to the second space B, the hydraulic fluid causes the valve ball 72 to block the third flow channel 71.

[0075] In other embodiments, a one - way valve 70 for the hydraulic fluid to 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.

[0076] 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 may squeeze the first piston 321 so that the hydraulic pressure in the second space B is maintained at a certain pressure.

[0077] In the second specific embodiment, as Figure 8As shown, the difference from the first specific embodiment is that one 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. One first lug 41a is used to abut against one first cam surface 11. The first abutting member 31 includes a second lug 31a extending forward. The second lug 31a is located between the two first lugs 41a. Similarly, third rollers 311, longitudinal grooves 312 and their corresponding assembly methods as shown in the first specific embodiment or the first rollers 411, receiving grooves 412 and second rollers 413 and their corresponding assembly methods as shown can be provided on the first lugs 41a. Third rollers 311, longitudinal grooves 312 and their corresponding assembly methods as shown in the first specific embodiment or the first rollers 411, receiving grooves 412 and second rollers 413 and their corresponding assembly methods as shown can also be provided on the second lug 31a, which will not be described in detail herein.

[0078] In the description and claims of this application, the words "comprise / include" and the words "have / 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.

[0079] Some features of the present invention 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 invention 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.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hinge, characterized in that: The hinge comprises: A pivot, wherein a first cam surface and a second cam surface are provided on the pivot, wherein the first cam surface and the second cam surface are located at different axial positions of the pivot, and a first convex point of the first cam surface and a second convex point of the second cam surface are at different circumferential angles of the pivot; A housing, wherein the housing has a front and a rear facing each other, the pivot is close to the front, and the housing has an inner cavity; A first buffer mechanism, which is disposed in the inner cavity and includes: a first abutting member abutting against the first cam surface, and a first buffer connected to the first abutting member; A second buffer mechanism, the second buffer mechanism is arranged in the inner cavity, comprising: a second abutting member abutting against the second cam surface, and a second buffer connected to the second abutting member and located behind the second abutting member and in front of the first buffer; The first supporting member and the second supporting member can slide relatively forward and backward, the rear end of the first supporting member passes over the rear end of the second supporting member and extends backward, and the second buffer is arranged in a first space between the first supporting member and the shell.

2. The hinge according to claim 1, characterized in that: The second buffer includes a first spring sleeved outside the first resisting member.

3. 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.

4. The hinge according to claim 3, 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.

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 3, 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 includes a third flow channel and a valve ball, wherein the third flow channel is arranged on the first supporting member, the third flow channel connects the second space and the third space, and the valve ball is confined in the third flow channel; or, the one-way valve includes a through hole opened on the second piston and a diaphragm arranged behind the second piston.

8. The hinge according to claim 3, 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.

9. The hinge according to claim 8, characterized in that The hinge further comprises a collar, which is movably sleeved on the first abutting member, the rear end of the second buffer abuts against the front side of the collar, and the front end of the third spring abuts against the rear side of the collar.

10. The hinge according to claim 1, characterized in that The first supporting member includes a push rod, and the second supporting member includes a sleeve. The push rod is placed in the sleeve and is slidably connected to the sleeve.

Images