Hinge assembly and electronic device

Abstract

The application provides a hinge assembly and an electronic device. The hinge assembly comprises a hinge module, which comprises a rotating shaft, a swing arm, a first cam, a first sliding cam, a second sliding cam and an elastic piece. The swing arm is sleeved on the rotating shaft and comprises a connecting arm and a second cam connected to each other. The first cam, the first sliding cam, the second sliding cam and the elastic piece are arranged on the rotating shaft. The first sliding cam is opposite to the second cam. One end of the elastic piece is in contact with the first sliding cam, and the other end of the elastic piece is connected to the second sliding cam. The first cam is arranged at one end of the second sliding cam away from the elastic piece. The first cam and the second cam can rotate synchronously with the rotating shaft. In the rotating process of the swing arm, the second cam drives the rotating shaft to rotate, and then the first cam rotates synchronously with the rotating shaft. The second cam drives the first sliding cam, and the first cam drives the second sliding cam, so that the first sliding cam and the second sliding cam move towards each other to compress the elastic piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, in particular to a hinge assembly and an electronic device. BACKGROUND

[0002] With the development of communication technology and the improvement of user demand, the size of mobile phone display screens is getting larger and larger, and foldable screen mobile phones have become a future development trend. At present, a hinge assembly is usually used to connect the folding part of the foldable screen mobile phone. The traditional hinge assembly includes a rotating shaft, a synchronous swing arm and a cam arranged on the rotating shaft, and an integrated connecting bridge is used to connect the synchronous swing arm and the cam, so that the synchronous swing arm and the cam are made to rotate synchronously through the connecting bridge, which will make the hinge assembly occupy a larger volume. SUMMARY

[0003] Embodiments of the present application provide a hinge assembly and an electronic device to solve the problem of a large volume occupied by the hinge assembly.

[0004] In a first aspect, embodiments of the present application provide a hinge assembly, comprising a hinge module, the hinge module comprising: a rotating shaft, a swing arm, a first cam, a first sliding cam, a second sliding cam and an elastic piece, wherein,

[0005] The swing arm is sleeved on the rotating shaft, and the swing arm comprises a connecting arm and a second cam connected to each other;

[0006] The first cam, the first sliding cam, the second sliding cam and the elastic piece are arranged on the rotating shaft, the first sliding cam is opposite to the second cam, one end of the elastic piece is in contact with the first sliding cam, the other end of the elastic piece is connected to the second sliding cam, the first cam is arranged at one end of the second sliding cam away from the elastic piece, and the first cam and the second cam can rotate synchronously with the rotating shaft;

[0007] During the rotation of the swing arm, the second cam drives the rotating shaft to rotate, and then the first cam rotates synchronously with the rotating shaft, the second cam drives the first sliding cam, the first cam drives the second sliding cam, so that the first sliding cam and the second sliding cam move towards each other to compress the elastic piece.

[0008] In a second aspect, embodiments of the present application also provide an electronic device comprising the hinge assembly of the first aspect.

[0009] In the embodiment of the present application, the second cam drives the rotating shaft to rotate in the process of rotating the swing arm, and then the first cam rotates synchronously with the rotating shaft. In this way, compared with the prior art, the connecting bridge does not need to be additionally arranged to make the swing arm and the first cam rotate synchronously, so that the volume occupied by the hinge assembly can be reduced, and the miniaturization design of the product is facilitated.

[0010] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0011] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0012] Figure 1 is a structural schematic diagram of a hinge assembly provided by an embodiment of the present application;

[0013] Figure 2 is a partial enlarged structural schematic diagram of a hinge assembly provided by an embodiment of the present application;

[0014] Figure 3 is an exploded structural schematic diagram of a hinge assembly provided by an embodiment of the present application;

[0015] Figure 4 is a cross-sectional structural schematic diagram of a hinge assembly provided by an embodiment of the present application;

[0016] Figure 5 is a structural schematic diagram of another hinge assembly provided by an embodiment of the present application;

[0017] Figure 6 is an exploded structural schematic diagram of another hinge assembly provided by an embodiment of the present application. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts, under the premise that the embodiments are not disclosed, belong to the scope of protection of the present application.

[0019] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] See Figures 1 to 6 This application provides a hinge assembly, such as... Figure 1 As shown, the hinge assembly includes a hinge module, which comprises: a pivot 110, a swing arm 111, a first cam 112, a first sliding cam 113, a second sliding cam 114, and an elastic element 115, wherein...

[0023] The swing arm 111 is sleeved on the rotating shaft 110, and the swing arm 111 includes a connecting arm 1111 and a second cam 1112 that are connected to each other.

[0024] The first cam 112, the first sliding cam 113, the second sliding cam 114 and the elastic member 115 are arranged on the rotating shaft 110, the first sliding cam 113 is opposite to the second cam 112, one end of the elastic member 115 is in contact with the first sliding cam 113, the other end of the elastic member 115 is connected with the second sliding cam 114, the first cam 112 is arranged at the end of the second sliding cam 114 away from the elastic member 115, and the first cam 112 and the second cam 112 can rotate synchronously with the rotating shaft 110.

[0025] During the rotation of the swing arm 111, the second cam 112 drives the rotating shaft 110 to rotate, and then the first cam 112 rotates synchronously with the rotating shaft 110, the second cam 112 drives the first sliding cam 113, and the first cam 112 drives the second sliding cam 114, so that the first sliding cam 113 and the second sliding cam 114 move towards each other to compress the elastic member 115.

[0026] In the embodiment, the swing arm 111 can be integrally connected or fixedly connected with the second cam 112, and the first cam 112 and the second cam 112 are installed on the rotating shaft 110, and no displacement is generated in the radial direction of the rotating shaft 110, for example, the first cam 112 and the second cam 112 can be clamped or riveted with the rotating shaft 110. In this way, during the rotation of the swing arm 111, the swing arm 111 drives the rotating shaft 110 to rotate through the second cam 112, and during the rotation of the rotating shaft 110, the first cam 112 is driven to rotate synchronously.

[0027] Optionally, the first sliding cam 113 and the second sliding cam 114 can be displaced in the axial direction or the radial direction relative to the rotating shaft 110 when being installed on the rotating shaft 110, for example, the first sliding cam 113 and the second sliding cam 114 are sleeved on the rotating shaft 110 through the mounting through holes thereof, and the inner diameter of the mounting through hole of the first sliding cam 113 and the second sliding cam 114 is slightly larger than the maximum outer diameter of the rotating shaft 110, so that the first sliding cam 113 and the second sliding cam 114 can be displaced in the axial direction or the radial direction relative to the rotating shaft 110 during the rotation of the rotating shaft 110.

[0028] Optionally, the elastic member 115 can be in a compressed or stretched deformed state to keep the first sliding cam 113 and the second cam 1112 in abutting state, and to keep the second sliding cam 114 and the first cam 112 in abutting state, that is, the elastic member 115 can be used to provide damping force for relative rotation of the first sliding cam 113 and the second cam 1112, and to provide damping force for relative rotation of the second sliding cam 114 and the first cam 112. In this way, the first sliding cam 113 and the second cam 1112 can keep the relative position unchanged without external force, while the second sliding cam 114 and the first cam 112 keep the relative position unchanged.

[0029] In the embodiment of the present application, the second cam 1112 drives the rotating shaft 110 to rotate during the rotation of the swing arm 111, and then the first cam 112 rotates synchronously with the rotating shaft 110. In this way, compared with the prior art, the swing arm 111 and the first cam 112 do not need to be connected by an additional connecting bridge to rotate synchronously, so that the volume occupied by the hinge assembly can be reduced, facilitating the miniaturization design of the product.

[0030] Optionally, in some embodiments, the rotating shaft 110 is a flat shaft, and the first cam 112 and the second cam 1112 are both provided with an oval-shaped through hole matched with the flat shaft.

[0031] In the embodiment of the present application, the rotating shaft 110 is a flat shaft, and the first cam 112 and the second cam 1112 are both provided with an oval-shaped through hole, so that the first cam 112 and the second cam 1112 cannot rotate relative to the rotating shaft 110. Of course, in other embodiments, the rotating shaft can also be provided in a cylindrical structure, and the surface of the cylinder can be provided with protrusions or grooves in the axial direction to prevent the first cam 112 and the second cam 1112 from rotating relative to the rotating shaft 110.

[0032] Optionally, the structures of the first cam 112, the second cam 1112, the first sliding cam 113 and the second sliding cam 114 can be set according to actual needs. For example, in some embodiments, the side of the first cam 112 facing the second sliding cam 114 includes at least two first protrusions uniformly spaced along the circumference of the first cam 112 and a first groove between two adjacent first protrusions; the side of the second sliding cam 114 facing the first cam 112 is provided with a second sliding groove matched with the first protrusion and a second sliding protrusion matched with the first groove.

[0033] During rotation of the first protrusion, the first protrusion can move between the second sliding groove and the second sliding protrusion.

[0034] In the embodiments of the present application, the number of the first protrusions, the first grooves, the second sliding protrusions and the second sliding grooves can all be three. During the rotation of the rotating shaft 110, the first protrusions can abut against the second sliding protrusions or the first protrusions are located in the second sliding grooves. When the first protrusions are located in the second sliding grooves, the second sliding protrusions are located in the first grooves, that is, the first cam 112 and the second sliding cam 114 abut against each other.

[0035] Similarly, the structure of the second cam 1112 and the first sliding cam 113 can be the same as that of the first cam 112 and the second sliding cam 114. For example, the second cam 1112 includes at least two second protrusions uniformly spaced along the circumference of the second cam and a second groove located between two adjacent second protrusions on one side of the second cam facing the first sliding cam 113; the first sliding cam 113 is provided with a first sliding groove matched with the second protrusions and a first sliding protrusion matched with the second groove on one side of the first sliding cam facing the second protrusions.

[0036] During the rotation of the second protrusions, the second protrusions can move between the first sliding grooves and the first sliding protrusions.

[0037] Optionally, the structure of the elastic member 115 can be set according to actual needs, for example, it can be a spring, a spring piece or other elastic structure. In some embodiments, the elastic member 115 includes a first spring, the first spring is sleeved on the rotating shaft 110, and one end of the first spring abuts against the first sliding cam 113 and the other end of the first spring abuts against the second sliding cam 114.

[0038] In the embodiments of the present application, the first spring can always be in a compressed state. Since the spring is used as the elastic member, it only needs to be sleeved on the rotating shaft 110 for installation and fixation, and the same elastic force can be guaranteed for the first sliding cam 113 and the second sliding cam 114, thereby ensuring the stability of the rotation. In addition, its structure is simple and convenient for industrial implementation.

[0039] Optionally, in some embodiments, the hinge assembly further includes a first fixed support 12, a second fixed support 13 and a connecting support 14, wherein the rotating shaft 110 is rotatably installed on the connecting support 14, the hinge assembly includes a first hinge module and a second hinge module arranged side by side in a first direction, the connecting arm 1111 of the first hinge module is in sliding connection with the first fixed support 12, and the connecting arm 1111 of the second hinge module is in sliding connection with the second fixed support 13.

[0040] In the embodiments of the present application, the first fixed support 12 and the second fixed support 13 are used to be fixed on an electronic device, for example, for a folding screen device, the first fixed support 12 and the second fixed support 13 are respectively fixed on two folding parts of the folding screen device, such as the middle frame of a mobile phone. The first fixed support 12 and the second fixed support 13 can be provided with sliding grooves, and the connecting arm 1111 can be installed in the sliding grooves. During the rotation of the first fixed support 12 and the second fixed support 13 relative to the connecting support 14, the connecting arm 1111 can slide in the corresponding sliding groove, and drive the second cam 1112, the rotating shaft 110 and the first cam 112 to rotate.

[0041] Optionally, in some embodiments, the first fixed support 12 and the second fixed support 13 can also be provided with a limiting protrusion, and the connecting arm 1111 is provided with a limiting hole, the limiting protrusion is located in the limiting hole and can slide in the limiting hole. The limiting protrusion and the limiting hole can limit the sliding distance of the connecting arm 1111 relative to the limiting groove, avoid the disconnection of the connecting arm 1111 from the limiting groove, and improve the reliability of the connection between the connecting arm 1111 and the first fixed support 12 and the second fixed support 13.

[0042] Optionally, in combination with the above description Figure 3 and Figure 4 In some embodiments, the hinge module further comprises a snap spring 116 and two oppositely arranged fixed blocks 117, the fixed blocks 117 are fixedly connected with the connecting support 14, the fixed blocks 117 are provided with a first through hole matched with the rotating shaft 110, the first end of the rotating shaft 110 passes through the two fixed blocks 117 in sequence, and the first end of the rotating shaft 110 is connected with the snap spring 116 in a clamping manner; the second cam 1112, the first cam 112, the first sliding cam 113, the second sliding cam 114 and the elastic member 115 are located between the two fixed blocks 117.

[0043] In the embodiments of the present application, the two fixed blocks 117 are located between the first end and the second end of the rotating shaft 110, that is, the fixed blocks 117 are sleeved on the rotating shaft 110, wherein the outer diameter of the second end of the rotating shaft 110 is greater than the first through hole, and the first end of the rotating shaft 110 is abutted with the fixed blocks 117 through the snap spring 116, so as to install and fix the rotating shaft 110 on the connecting support 14.

[0044] Optionally, the fixed blocks 117 can be installed and fixed on the connecting support 14 through screws, and the first end of the rotating shaft 110 can be provided with an annular clamping groove, and the snap spring 116 can be clamped and fixed on the annular clamping groove.

[0045] When installing, one fixing block 117 can be first installed and fixed on the connecting support 14, then the first end of the rotating shaft 110 is passed through the first through hole of the fixing block 117, then the swing arm 111, the first sliding cam 113, the first spring, the second sliding cam 114, the first cam 112 and the other fixing block 117 are sequentially sleeved on the rotating shaft 110 in sequence, and the other fixing block 117 is fixed on the connecting support 14, and finally the clasp spring 116 is clamped and fixed with the first end of the rotating shaft 110.

[0046] Optionally, in some embodiments, the hinge assembly further comprises a synchronous wheel 15, the second end of the rotating shaft 110 of the hinge assembly is provided with a rotating gear 1101, the rotating gear 1101 is in meshing connection with the synchronous wheel 15, so that the rotating shaft 110 of the first hinge module and the rotating shaft 110 of the second hinge module are synchronously connected in transmission.

[0047] In the embodiment of the application, the synchronous wheel 15 is used to make the rotating shaft 110 of the first hinge module and the rotating shaft 110 of the second hinge module rotate synchronously, so as to improve the stability of rotation. The rotating directions of the rotating shaft 110 of the first hinge module and the rotating shaft 110 of the second hinge module are opposite, for example, when the rotating shaft 110 of the first hinge module rotates clockwise, the rotating shaft 110 of the second hinge module rotates counterclockwise, so as to realize the folding or unfolding movement of the folding screen device.

[0048] It should be noted that the structure and number of the synchronous wheel can be set according to actual needs, for example, in the embodiment of the application, the number of the synchronous wheel can be two, and the two synchronous wheels 15 are arranged in parallel between the two rotating gears 1101, and the two synchronous wheels 15 and the two rotating gears 1101 are sequentially in meshing connection.

[0049] Optionally, in some embodiments, the first sliding cam 113 of the first hinge module and the first sliding cam 113 of the second hinge module are connected through a first connecting piece 118; the second sliding cam 114 of the first hinge module and the second sliding cam 114 of the second hinge module are connected through a second connecting piece 119.

[0050] In the embodiment of the application, the first sliding cam 113 can be integrally connected with the first connecting piece 118, and the second sliding cam 114 can be integrally connected with the second connecting piece 119. In this way, the difficulty of assembly is reduced. Of course, in other embodiments, the first sliding cam 113 can also be fixedly connected with the first connecting piece 118 through a screw, which is not limited here.

[0051] Further, a guide rod and a third spring can be arranged between the two fixed blocks, the first connecting piece 118 is provided with a second through hole matched with the guide rod, the second connecting piece 119 is provided with a third through hole matched with the guide rod; the third spring is sleeved on the guide rod, the third spring is located between the first connecting piece and the second connecting piece, and the third spring abuts against the first connecting piece 118 and the second connecting piece 119 respectively.

[0052] Optionally, please refer to Figure 5 and Figure 6 In some embodiments, the hinge assembly comprises a third hinge module and a fourth hinge module arranged symmetrically in the second direction, and the rotation shafts 110 of the third hinge module and the fourth hinge module are integrally connected.

[0053] In the embodiments of the present application, the first direction and the second direction can be perpendicular to each other, for example, when the number of hinge modules is four, any two hinge modules in the first direction can be referred to as a first hinge module and a second hinge module, and any two hinge modules in the second direction can be referred to as a third hinge module and a fourth hinge module. Since the rotation shafts 110 of the two hinge modules in the second direction are arranged as an integral structure, the volume occupied by the hinge assembly can be reduced, and at the same time the installation difficulty can be reduced. In addition, since the number of separate cams (i.e. sliding cams) is increased, the torque of the rotation shaft can be increased, and the stability of the connection of the hinge assembly is improved. At the same time, the torque is dispersed on the two swing arms 111 to avoid stress concentration and fracture of a single swing arm.

[0054] Optionally, in some embodiments, a third cam 16, a third sliding cam 17, a second spring 18, a fourth sliding cam 19 and a fourth cam 20 are further sleeved on the rotation shaft 110 in sequence, and the third cam 16, the third sliding cam 17, the second spring 18, the fourth sliding cam 19 and the fourth cam 20 are located between the fixed block 117 of the third hinge module and the fixed block 117 of the fourth hinge module.

[0055] During the rotation of the swing arm 111, the second cam 1112 drives the rotation shaft 110 to rotate, and then the third cam 16 and the fourth cam 20 rotate synchronously with the rotation shaft 110, the third cam 16 drives the third sliding cam 17, and the fourth cam 20 drives the fourth sliding cam 19, so that the third sliding cam 17 and the fourth sliding cam 19 move towards each other to compress the second spring 18.

[0056] In the embodiments of the present application, the structures of the third cam 16, the third sliding cam 17, the second spring 18, the fourth sliding cam 19 and the fourth cam 20 are the same as those of the second cam 1112, the first sliding cam 113, the first spring, the second sliding cam 114 and the first cam 112, which can be referred to the above embodiments and will not be described here again. Since the third cam 16, the third sliding cam 17, the second spring 18, the fourth sliding cam 19 and the fourth cam 20 are arranged between the two hinge modules, the torque of the rotating shaft 110 can be further increased, and the stability of the hinge assembly connection is improved.

[0057] Optionally, the embodiments of the present application further provide an electronic device, which comprises the hinge assembly in the above embodiments, and the structure of the hinge assembly can be referred to the above embodiments and will not be described here again. Since the electronic device provided by the embodiments of the present application comprises the hinge assembly in the above embodiments, the electronic device provided by the embodiments of the present application has all the beneficial effects of the hinge assembly in the above embodiments, and will not be described here again to avoid repetition.

[0058] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hinge assembly, characterized by The hinge module includes: a pivot, a rocker arm, a first cam, a first sliding cam, a second sliding cam, and an elastic element. The swing arm is sleeved on the rotating shaft, and the swing arm includes a connecting arm and a second cam that are connected to each other. The first cam, the first sliding cam, the second sliding cam, and the elastic element are disposed on the rotating shaft, and the first sliding cam is opposite to the second cam. One end of the elastic element is in contact with the first sliding cam, and the other end of the elastic element is connected to the second sliding cam. The first cam is disposed on the end of the second sliding cam that is away from the elastic element. The first cam and the second cam can rotate synchronously with the rotating shaft. During the rotation of the swing arm, the second cam drives the rotating shaft to rotate, and the first cam rotates synchronously with the rotating shaft. The second cam drives the first sliding cam, and the first cam drives the second sliding cam, so that the first sliding cam and the second sliding cam move towards each other to compress the elastic element. The elastic element is used to provide a damping force for the relative rotation of the first sliding cam and the second cam, and to provide a damping force for the relative rotation of the second sliding cam and the first cam.

2. The hinge assembly of claim 1, wherein, The rotating shaft is a flat shaft, and both the first cam and the second cam are provided with elliptical through holes adapted to the flat shaft.

3. The hinge assembly of claim 1, wherein, The side of the first cam facing the second sliding cam includes at least two first protrusions evenly spaced along the circumference of the first cam and a first groove located between two adjacent first protrusions; the side of the second sliding cam facing the first cam is provided with a second sliding groove that matches the first protrusion and a second sliding protrusion that matches the first groove. During the rotation of the first protrusion, the first protrusion can move between the second sliding groove and the second sliding protrusion.

4. The hinge assembly of claim 1, wherein, The side of the second cam facing the first sliding cam includes at least two second protrusions evenly spaced along the circumference of the second cam and a second groove located between two adjacent second protrusions; the side of the first sliding cam facing the second protrusion is provided with a first sliding groove matching the second protrusion and a first sliding protrusion matching the second groove. During the rotation of the second protrusion, the second protrusion can move between the first sliding groove and the first sliding protrusion.

5. The hinge assembly of claim 1, wherein, The elastic element includes a first spring, which is sleeved on the rotating shaft, with one end abutting against the first sliding cam and the other end abutting against the second sliding cam.

6. The hinge assembly of claim 1, wherein, The hinge assembly further includes a first fixed bracket, a second fixed bracket, and a connecting bracket, wherein the pivot is rotatably mounted on the connecting bracket, and the hinge assembly includes a first hinge module and a second hinge module arranged side by side in a first direction, wherein the connecting arm of the first hinge module is slidably connected to the first fixed bracket, and the connecting arm of the second hinge module is slidably connected to the second fixed bracket.

7. The hinge assembly of claim 6, wherein, The hinge module further comprises a snap spring and two oppositely arranged fixing blocks fixedly connected with the connecting support, the fixing blocks are provided with first through holes matched with the rotating shaft, the first end of the rotating shaft sequentially passes through the two fixing blocks, and the first end of the rotating shaft is snap-fit connected with the snap spring; the second cam, the first cam, the first sliding cam, the second sliding cam and the elastic member are located between the two fixing blocks.

8. The hinge assembly of claim 7, wherein, The hinge assembly further comprises a synchronous wheel, the second end of the rotating shaft of the hinge assembly is provided with a rotating gear, the rotating gear is meshingly connected with the synchronous wheel, so that the rotating shaft of the first hinge module and the rotating shaft of the second hinge module are synchronously transmission connected.

9. The hinge assembly of claim 7, wherein, The first sliding cam of the first hinge module and the first sliding cam of the second hinge module are connected through a first connecting piece; the second sliding cam of the first hinge module and the second sliding cam of the second hinge module are connected through a second connecting piece.

10. The hinge assembly of claim 7, wherein, The hinge assembly comprises a third hinge module and a fourth hinge module symmetrically arranged in the second direction, the rotating shaft of the third hinge module and the rotating shaft of the fourth hinge module are integrally connected.

11. The hinge assembly of claim 10, wherein, The rotating shaft is further sequentially provided with a third cam, a third sliding cam, a second spring, a fourth sliding cam and a fourth cam, the third cam, the third sliding cam, the second spring, the fourth sliding cam and the fourth cam are located between the fixing block of the third hinge module and the fixing block of the fourth hinge module; During the rotation of the swing arm, the second cam drives the rotating shaft to rotate, and then the third cam and the fourth cam synchronously rotate with the rotating shaft, the third cam drives the third sliding cam, and the fourth cam drives the fourth sliding cam, so that the third sliding cam and the fourth sliding cam move towards each other to compress the second spring.

12. An electronic device, comprising: The hinge assembly comprises the hinge assembly according to any one of claims 1 to 11. The hinge assembly comprises the hinge assembly according to any one of claims 1 to 11.

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