Hinge assembly and electronic device

Abstract

The application provides a hinge assembly and an electronic device, comprising a hinge support, a gear assembly and a swing arm assembly; wherein the swing arm assembly comprises a first swing arm and a second swing arm, the first swing arm and the second swing arm are symmetrically arranged on two sides of the hinge support, the first swing arm and the second swing arm are rotationally connected through the gear assembly to realize synchronous rotation of the first swing arm and the second swing arm; the gear assembly comprises a first gear and a second gear, the first gear is installed on the hinge support through a first rotating shaft, and the first gear is fixedly connected with the first swing arm, the second gear is installed on the hinge support through a second rotating shaft, and the second gear is fixedly connected with the second swing arm; wherein the distance between the first rotating shaft and the second rotating shaft increases or decreases in the process of synchronous rotation of the first gear and the second gear.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and in particular to a hinge assembly and an electronic device. Background Technology

[0002] With the development of communication technology and the increasing demands of users, mobile phone screens are becoming larger and larger, making foldable screen phones a future trend. Currently, foldable screen phones typically use hinge components for connection at the folding point. Figure 1 As shown, a traditional hinge assembly includes a hinge bracket 10' and a synchronizing gear 20' and a swing arm 30' mounted on the hinge bracket 10'. The synchronizing gear 20' and the swing arm 30' are meshed together, and the swing arm 30' rotates around the same axis under the action of the synchronizing gear 20'. This can easily cause the screen to arch during the initial folding process, leading to screen failure. Summary of the Invention

[0003] This application provides a hinge assembly and an electronic device to solve the problem that the screen is prone to arching and causing screen failure during the initial folding process of the electronic device.

[0004] In a first aspect, embodiments of this application provide a hinge assembly, including a hinge bracket, a gear assembly, and a swing arm assembly; wherein...

[0005] The swing arm assembly includes a first swing arm and a second swing arm, which are symmetrically arranged on both sides of the hinge bracket. The first swing arm and the second swing arm are rotatably connected by the gear assembly to achieve synchronous rotation of the first swing arm and the second swing arm.

[0006] The gear assembly includes a first gear and a second gear. The first gear is mounted on the hinge bracket via a first rotating shaft and is fixedly connected to the first swing arm. The second gear is mounted on the hinge bracket via a second rotating shaft and is fixedly connected to the second swing arm.

[0007] During the synchronous rotation of the first gear and the second gear, the distance between the first rotating shaft and the second rotating shaft increases or decreases.

[0008] In a second aspect, embodiments of this application also provide an electronic device, which includes a first housing, a second housing, and a hinge assembly as described in the first aspect;

[0009] The first housing is connected to the first swing arm of the hinge assembly, and the second housing is connected to the second swing arm of the hinge assembly. The first housing and the second housing rotate relative to each other as the first swing arm and the second swing arm rotate, so that the electronic device switches between an unfolded state and a folded state.

[0010] In this embodiment, the hinge assembly includes a hinge bracket, a gear assembly, and a swing arm assembly. The swing arm assembly includes a first swing arm and a second swing arm, symmetrically arranged on both sides of the hinge bracket. The first and second swing arms are rotatably connected via the gear assembly to achieve synchronous rotation. The gear assembly includes a first gear and a second gear. The first gear is mounted on the hinge bracket via a first rotating shaft and is fixedly connected to the first swing arm. The second gear is mounted on the hinge bracket via a second rotating shaft and is fixedly connected to the second swing arm. During the synchronous rotation of the first and second gears, the distance between the first and second rotating shafts increases or decreases. This allows the distance between the first and second rotating shafts to increase during the initial rotation from the unfolded state to the folded state, thus preventing the folding screen from arching and malfunctioning during the initial folding process. Therefore, this embodiment improves the reliability and extends the lifespan of the folding screen.

[0011] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0012] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0013] Figure 1 This is a structural diagram of a traditional hinge assembly;

[0014] Figure 2 This is a schematic diagram of the hinge assembly provided in an embodiment of this application;

[0015] Figure 3 This is one of the schematic diagrams of the unfolded state structure of the hinge assembly provided in the embodiments of this application;

[0016] Figure 4 This is the second schematic diagram of the unfolded state structure of the hinge assembly provided in the embodiments of this application;

[0017] Figure 5This is one of the schematic diagrams of the folded state structure of the hinge assembly provided in the embodiments of this application;

[0018] Figure 6 This is the second schematic diagram of the folded state structure of the hinge assembly provided in the embodiments of this application;

[0019] Figure 7 This is a schematic diagram of the hinge bracket in the hinge assembly provided in the embodiments of this application. Detailed Implementation

[0020] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See Figures 2 to 7 This application provides a hinge assembly, such as... Figures 2 to 7 As shown, the hinge assembly includes a hinge bracket 10, a gear assembly 20, and a swing arm assembly 30; wherein,

[0025] The swing arm assembly 30 includes a first swing arm 31 and a second swing arm 32. The first swing arm 31 and the second swing arm 32 are symmetrically arranged on both sides of the hinge bracket 10. The first swing arm 31 and the second swing arm 32 are rotatably connected by the gear assembly 20 to achieve synchronous rotation of the first swing arm 31 and the second swing arm 32.

[0026] The gear assembly 20 includes a first gear 21 and a second gear 22. The first gear 21 is mounted on the hinge bracket 10 via a first rotating shaft 211 and is fixedly connected to the first swing arm 31. The second gear 22 is mounted on the hinge bracket 10 via a second rotating shaft 221 and is fixedly connected to the second swing arm 32.

[0027] During the synchronous rotation of the first gear 21 and the second gear 22, the distance between the first rotating shaft 211 and the second rotating shaft 221 increases or decreases.

[0028] In this embodiment, the hinge assembly is applied to an electronic device with a foldable screen to control the folding and unfolding states of the screen. The swing arm assembly 30 is connected to the housing (e.g., mid-frame) of the electronic device, thereby driving the first swing arm 31 to rotate via the first gear 21 and the second swing arm 32 to rotate via the second gear 22, thus realizing the folding and unfolding states of the screen. Therefore, in this embodiment, the rotation of the first gear 21 and the second gear 22 can be reciprocating motion. For example, when the first gear 21 rotates in a first direction (e.g., clockwise) and the second gear 22 rotates in a second direction (e.g., counterclockwise), the foldable screen can switch from an unfolded state to a folded state; when the first gear 21 rotates in the second direction and the second gear 22 rotates in the first direction, the foldable screen can switch from a folded state to an unfolded state.

[0029] It should be understood that when the folding screen is in the unfolded state, it can be understood that the first swing arm 31 and the second swing arm 32 are in the unfolded state (e.g., Figure 3 and Figure 4 (as shown); when the foldable screen is in the folded state, it can be understood that the first swing arm 31 and the second swing arm 32 are in the folded state (as shown). Figure 5 and Figure 6 (As shown).

[0030] Optionally, during the process of the first swing arm 31 and the second swing arm 32 rotating from the unfolded state to the folded state (i.e., the folding process), the distance between the first rotation axis 211 and the second rotation axis 221 can be increased; or it can be increased first and then kept unchanged; or it can be increased first and then decreased.

[0031] It should be noted that during the process of the first swing arm 31 and the second swing arm 32 rotating from the folded state to the unfolded state (i.e., the unfolding process), the change in the distance between the first rotation axis 211 and the second rotation axis 221 is opposite to the change in the distance during the process of the first swing arm 31 and the second swing arm 32 rotating from the unfolded state to the folded state. The specific change can be set according to actual needs. For example, in actual use, the distance between the first rotation axis 211 and the second rotation axis 221 can be increased during the initial rotation (i.e., the initial folding) of the first swing arm 31 and the second swing arm 32 from the unfolded state to the folded state. This can prevent the screen from arching during the initial folding process, which could cause the foldable screen to malfunction.

[0032] In this embodiment, the hinge assembly includes a hinge bracket 10, a gear assembly 20, and a swing arm assembly 30. The swing arm assembly 30 includes a first swing arm 31 and a second swing arm 32, symmetrically arranged on both sides of the hinge bracket 10. The first swing arm 31 and the second swing arm 32 are rotatably connected via the gear assembly 20 to achieve synchronous rotation of the first swing arm 31 and the second swing arm 32. The gear assembly 20 includes a first gear 21 and a second gear 22. The first gear 21 is mounted on the hinge bracket 10 via a first rotating shaft 211 and is fixedly connected to the first swing arm 31. The second gear 22 is mounted on the hinge bracket 10 via a second rotating shaft 221 and is fixedly connected to the second swing arm 32. During the synchronous rotation of the first gear 21 and the second gear 22, the distance between the first rotating shaft 211 and the second rotating shaft 221 increases or decreases. In this way, the distance between the first rotation axis 211 and the second rotation axis 221 can be increased during the initial rotation of the first swing arm 31 and the second swing arm 32 from the unfolded state to the folded state. This avoids the phenomenon of the folding screen arching and failing during the initial folding process. Therefore, the embodiments of this application improve the reliability of folding screen use and extend the service life of folding screen.

[0033] Optionally, in some embodiments, the gear assembly 20 further includes a first synchronizing gear 23 and a second synchronizing gear 24, the first synchronizing gear 23 and the second synchronizing gear 24 being meshed together, the first synchronizing gear 23 being meshed with the first gear 21, and the second synchronizing gear 24 being meshed with the second gear 22; the first synchronizing gear 23 is mounted on the hinge bracket 10 via a third rotating shaft 231, and the second synchronizing gear 24 is mounted on the hinge bracket 10 via a fourth rotating shaft 241;

[0034] During the synchronous rotation of the first gear 21 and the second gear 22, the distance between the first rotating shaft 211 and the third rotating shaft 231 increases or decreases, and the distance between the second rotating shaft 221 and the fourth rotating shaft 241 increases or decreases.

[0035] In this embodiment, the first synchronous gear 23 and the second synchronous gear 24 rotate around a fixed axis. Specifically, the first synchronous gear 23 rotates around a third rotating shaft 231 as its center of rotation, and the position of the third rotating shaft 231 remains unchanged. Simultaneously, the second synchronous gear 24 rotates around a fourth rotating shaft 241 as its center of rotation, and the position of the fourth rotating shaft 241 remains unchanged. The first gear 21 and the second gear 22 rotate around a variable axis. Specifically, the first gear 21 rotates around a first rotating shaft 211 as its center of rotation, and the position of the first rotating shaft 211 can change during rotation. For example, the distance between the first rotating shaft 211 and the third rotating shaft 231 may increase or decrease during rotation. Simultaneously, the second gear 22 rotates around a second rotating shaft 221 as its center of rotation, and the position of the second rotating shaft 221 can change during rotation. For example, the distance between the second rotating shaft 221 and the fourth rotating shaft 241 may increase or decrease during rotation.

[0036] It should be noted that, since the meshing connection between the first gear 21 and the second gear 22 is indirectly achieved by using the first synchronous gear 23 and the second synchronous gear 24, the rotational stability can be increased when the first gear 21 and the second gear 22 rotate with different shafts.

[0037] Optionally, in some embodiments, the hinge assembly further includes a first elastic element 40 and a second elastic element 50, one end of the first elastic element 40 being connected to the first rotation shaft 211 and the other end being connected to the hinge bracket 10 or the third rotation shaft 231; one end of the second elastic element 50 being connected to the second rotation shaft 221 and the other end being connected to the hinge bracket 10 or the fourth rotation shaft 241.

[0038] In this embodiment, the first elastic element 40 provides an elastic driving force to maintain the meshing connection between the first rotating shaft 211 and the third rotating shaft 231, and the second elastic element 50 provides an elastic driving force to maintain the meshing connection between the second rotating shaft 221 and the fourth rotating shaft 241. This ensures the stability of the gear assembly 20 meshing, thereby ensuring the reliability of the rotation of the first swing arm 31 and the second swing arm 32.

[0039] It should be understood that the structures of the first elastic element 40 and the second elastic element 50 described above can be configured according to actual needs. For example, in some embodiments, both the first elastic element 40 and the second elastic element 50 are springs. Since springs are used as elastic elements, the structure is simple and easy to install and industrially produce.

[0040] Optionally, in some embodiments, one end of the first elastic member 40 is sleeved on the first rotating shaft 211, and the other end is sleeved on the third rotating shaft 231; one end of the second elastic member 50 is sleeved on the second rotating shaft 221, and the other end is sleeved on the fourth rotating shaft 241.

[0041] Optionally, in some embodiments, annular grooves adapted to the hooks can be provided on the first rotating shaft 211, the second rotating shaft 221, the third rotating shaft 231, and the fourth rotating shaft 241 to facilitate the installation of hooks for fixing elastic elements and increase the stability of hook installation.

[0042] It should be understood that the above-mentioned hooks can be either open semi-circular hooks or closed circular hooks, without further limitation.

[0043] In this embodiment, both ends of the first elastic member 40 and the second elastic member 50 can be configured as hook structures, which are then sleeved on the corresponding rotating shafts, facilitating installation. Simultaneously, during rotation, the provided elastic force is always maintained along the line connecting the two rotating shafts, thus further ensuring the stability of the meshing of the first gear 21 with the first gear 21, and the stability of the meshing of the second gear 22 with the second gear 22.

[0044] Optionally, in some embodiments, at least one of the first gear 21 and the first synchronizing gear 23 is an elliptical gear;

[0045] At least one of the second gear 22 and the second synchronizing gear 24 is an elliptical gear.

[0046] In this embodiment, the first gear 21 and the second gear 22 can be configured as elliptical gears, and the first synchronous gear 23 and the second synchronous gear 24 can be configured as circular gears; alternatively, the first gear 21 and the second gear 22 can be configured as circular gears, and the first synchronous gear 23 and the second synchronous gear 24 can be configured as elliptical gears; furthermore, the first gear 21, the second gear 22, the first synchronous gear 23, and the second synchronous gear 24 can all be configured as elliptical gears. Because the first gear 21, the second gear 22, the first synchronous gear 23, and the second synchronous gear 24 are all configured as elliptical gears, the rate of change of the distance between the first rotating shaft 211 and the third rotating shaft 231 can be maximized. This allows for a rapid increase in the distance between the first rotating shaft 211 and the third rotating shaft 231 during the initial folding process, effectively preventing the folding screen from arching.

[0047] It should be understood that in other embodiments, the first gear 21, the second gear 22, the first synchronizing gear 23 and the second synchronizing gear 24 described above may also be gears of other shapes. Using elliptical gears can improve rotational stability.

[0048] Optionally, in some embodiments, the hinge bracket 10 is provided with a receiving groove 101, and the two opposite side walls of the receiving groove 101 are each provided with a first sliding groove 102 adapted to the first rotating shaft 211, a second sliding groove 103 adapted to the second rotating shaft 221, a first fixing hole 104 adapted to the third rotating shaft 231, and a second fixing hole 105 adapted to the fourth rotating shaft 241;

[0049] The first slide groove 102 and the second slide groove 103 are symmetrically arranged and are both arc-shaped slide grooves. During the synchronous rotation of the first gear 21 and the second gear 22, the first rotating shaft 211 can slide along the first slide groove 102 and the second rotating shaft 221 can slide along the second slide groove 103.

[0050] In this embodiment of the application, the first rotating shaft 211 is installed in two opposite first sliding grooves 102, the second rotating shaft 221 is installed in two opposite second sliding grooves 103, the third rotating shaft 231 is installed in two opposite first fixing holes 104, and the fourth rotating shaft 241 is installed in two opposite second fixing holes 105.

[0051] It should be understood that the first groove 102 is used to limit the sliding trajectory of the first rotating shaft 211, and its specific shape is determined based on the shape of the first gear 21 and the first rotating shaft 211; the second groove 103 is used to limit the sliding trajectory of the second rotating shaft 221, and its specific shape is determined based on the shape of the second gear 22 and the fourth rotating shaft 241.

[0052] Optionally, in some embodiments, the outer side wall of the hinge bracket 10 is provided with a first receiving cavity 106 corresponding to the position of the first slide groove 102 and the first fixing hole 104, and a second receiving cavity 107 is provided corresponding to the position of the second slide groove 103 and the second fixing hole 105.

[0053] The first receiving cavity 106 is connected to the first slide 102 and the first fixing hole 104, and the first elastic member 40 is located in the first receiving cavity 106; the second receiving cavity 107 is connected to the second slide 103 and the second fixing hole 105, and the second elastic member 50 is located in the second receiving cavity 107.

[0054] In this embodiment, the first elastic element 40 is disposed in the first receiving cavity 106, and the second elastic element 50 is disposed in the second receiving cavity 107. This avoids the first elastic element 40 and the second elastic element 50 being located at the meshing position of the gear assembly 20, which would prevent the gear assembly 20 from rotating. This improves the reliability of the rotation of the gear assembly 20. At the same time, it can reduce the volume of the hinge assembly.

[0055] It should be noted that the first receiving cavity 106 and the second receiving cavity 107 have openings formed on the outer side wall of the hinge bracket 10 for installing the elastic element, in order to prevent the elastic element from being exposed. Furthermore, a first baffle plate 108 and a second baffle plate 109 can also be provided on the outer side wall of the hinge bracket 10. The first baffle plate 108 is used to partially cover the opening of the first receiving cavity 106, and the second baffle plate 109 is used to partially cover the opening of the second receiving cavity 107, specifically as follows... Figure 3 and Figure 5 As shown, in Figure 3 The first shield 108 and the second shield 109 were not installed in the middle. Figure 5 The first shield 108 and the second shield 109 are installed in the middle.

[0056] Optionally, in some embodiments, during the synchronous rotation of the first gear 21 and the second gear 22, the first swing arm 31 and the second swing arm 32 have a folded state and an unfolded state.

[0057] During the process of the first swing arm 31 and the second swing arm 32 rotating from the unfolded state to the folded state, the distance between the first rotation axis 211 and the second rotation axis 221 gradually increases; or, the process of the first swing arm 31 and the second swing arm 32 rotating from the unfolded state to the folded state includes a first process and a second process, wherein the first process is the first swing arm 31 and the second swing arm 32 rotating from the unfolded state to an intermediate state, and the second process is the first swing arm 31 and the second swing arm 32 rotating from the intermediate state to the folded state, and during the first process, the distance between the first rotation axis 211 and the second rotation axis 221 gradually increases.

[0058] In this embodiment of the application, the distance between the first rotation axis 211 and the second rotation axis 221 in the second process described above can be increased, decreased, or kept constant, without further limitation. The first and second processes described above can be understood as processes of rotation at different angles. For example, it takes 80 degrees of rotation to go from the unfolded state to the folded state. The first process is a certain angle range of the initial rotation. Assuming the angle corresponding to the first process is 30 degrees, then the rotation angle corresponding to the second process is 50 degrees. Therefore, the first process described above can also be understood as the initial folding process.

[0059] In this embodiment, the distance between the first rotation axis 211 and the second rotation axis 221 gradually increases during the initial folding process. Thus, during the initial folding process, the first swing arm 31 and the second swing arm 32 rotate while pushing the folded screen outwards, thereby reducing creases in the folded screen and lowering the risk of screen warping.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hinge assembly, characterized in that, Includes hinge bracket, gear assembly, and swing arm assembly; among which, The swing arm assembly includes a first swing arm and a second swing arm, which are symmetrically arranged on both sides of the hinge bracket. The first swing arm and the second swing arm are rotatably connected by the gear assembly to achieve synchronous rotation of the first swing arm and the second swing arm. The gear assembly includes a first gear and a second gear. The first gear is mounted on the hinge bracket via a first rotating shaft and is fixedly connected to the first swing arm. The second gear is mounted on the hinge bracket via a second rotating shaft and is fixedly connected to the second swing arm. During the synchronous rotation of the first gear and the second gear, the distance between the first rotating shaft and the second rotating shaft increases or decreases. The gear assembly further includes a first synchronous gear and a second synchronous gear, which are meshed together. The first synchronous gear is meshed with the first gear, and the second synchronous gear is meshed with the second gear. The first synchronous gear is mounted on the hinge bracket via a third rotating shaft, and the second synchronous gear is mounted on the hinge bracket via a fourth rotating shaft. During the synchronous rotation of the first gear and the second gear, the distance between the first rotating shaft and the third rotating shaft increases or decreases, and the distance between the second rotating shaft and the fourth rotating shaft increases or decreases. The hinge bracket is provided with a receiving groove. Each of the two opposite side walls of the receiving groove is provided with a first sliding groove adapted to the first rotating shaft, a second sliding groove adapted to the second rotating shaft, a first fixing hole adapted to the third rotating shaft, and a second fixing hole adapted to the fourth rotating shaft. The first and second slides are symmetrically arranged and are both arc-shaped slides. During the synchronous rotation of the first gear and the second gear, the first rotating shaft can slide along the first slide and the second rotating shaft can slide along the second slide.

2. The hinge assembly according to claim 1, characterized in that, The hinge assembly further includes a first elastic element and a second elastic element. One end of the first elastic element is connected to the first rotating shaft, and the other end is connected to the hinge bracket or the third rotating shaft. One end of the second elastic element is connected to the second rotating shaft, and the other end is connected to the hinge bracket or the fourth rotating shaft.

3. The hinge assembly according to claim 2, characterized in that, Both the first elastic element and the second elastic element are springs.

4. The hinge assembly according to claim 2, characterized in that, One end of the first elastic element is sleeved on the first rotating shaft, and the other end is sleeved on the third rotating shaft; one end of the second elastic element is sleeved on the second rotating shaft, and the other end is sleeved on the fourth rotating shaft.

5. The hinge assembly according to claim 1, characterized in that, At least one of the first gear and the first synchronizing gear is an elliptical gear; At least one of the second gear and the second synchronizing gear is an elliptical gear.

6. The hinge assembly according to claim 2, characterized in that, The outer wall of the hinge bracket is provided with a first receiving cavity corresponding to the position of the first sliding groove and the first fixing hole, and a second receiving cavity corresponding to the position of the second sliding groove and the second fixing hole; The first receiving cavity is connected to the first slide and the first fixing hole, and the first elastic member is located in the first receiving cavity; the second receiving cavity is connected to the second slide and the second fixing hole, and the second elastic member is located in the second receiving cavity.

7. The hinge assembly according to any one of claims 1 to 6, characterized in that, During the synchronous rotation of the first gear and the second gear, the first swing arm and the second swing arm have a folded state and an unfolded state. During the process of the first and second swing arms rotating from the unfolded state to the folded state, the distance between the first rotation axis and the second rotation axis gradually increases; or, the process of the first and second swing arms rotating from the unfolded state to the folded state includes a first process and a second process, wherein the first process is the first and second swing arms rotating from the unfolded state to an intermediate state, and the second process is the first and second swing arms rotating from the intermediate state to the folded state, and during the first process, the distance between the first rotation axis and the second rotation axis gradually increases.

8. An electronic device, characterized in that, Includes a first housing, a second housing, and a hinge assembly as described in any one of claims 1 to 7; The first housing is connected to the first swing arm of the hinge assembly, and the second housing is connected to the second swing arm of the hinge assembly. The first housing and the second housing rotate relative to each other as the first swing arm and the second swing arm rotate, so that the electronic device switches between an unfolded state and a folded state.

Images