Hinge mechanism and electronic device

Abstract

The invention relates to a hinge mechanism and electronic equipment. The hinge mechanism comprises a base frame, a transmission assembly and a supporting plate assembly. The transmission assembly comprises a first transmission structure and a second transmission structure, the first transmission structure is rotationally connected with the base frame, and the second transmission structure is in transmission connection with the first transmission structure. The supporting plate assembly comprises a first supporting plate and a second supporting plate, and the first supporting plate is fixedly assembled to the second transmission structure. The first supporting plate and the second supporting plate are rotationally connected so that the first supporting plate and the second supporting plate can be unfolded into a supporting structure in the unfolded state of the hinge mechanism and can be relatively bent in the folded state of the hinge mechanism so that an avoiding space can be defined, and the bent supporting plate assembly can be matched with the folded screen in shape. The adaptation degree of the supporting plate assembly and the screen in the folded and unfolded states is increased, and the space utilization rate of the hinge mechanism and the electronic equipment can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of electronic technology, and in particular to hinge mechanisms and electronic devices. Background Technology

[0002] Foldable electronic devices have portable screens when folded and can increase the screen size when unfolded. Switching between folded and unfolded states usually requires a hinge mechanism.

[0003] The support plate of the hinge mechanism can provide support during the folding and unfolding of the flexible screen, improving the reliability of the flexible screen. However, in related technologies, the support effect of the support plate on the flexible screen is usually limited by the support plate structure. If the size of the support plate is too large, it will affect the internal space layout of the foldable electronic device. Summary of the Invention

[0004] This disclosure provides a hinge mechanism and an electronic device to solve related technical problems.

[0005] According to a first aspect of this disclosure, a hinge mechanism is provided, the hinge mechanism comprising:

[0006] Base frame;

[0007] The transmission assembly includes a first transmission structure and a second transmission structure; the first transmission structure is rotatably connected to the base frame, and the second transmission structure is drively connected to the first transmission structure.

[0008] The support plate assembly includes a first support plate and a second support plate; the first support plate is fixedly assembled to the second transmission structure; the first support plate and the second support plate are rotatably connected to unfold into a support structure in the unfolded state of the hinge mechanism, and bend relative to each other in the folded state of the hinge mechanism to form an avoidance space.

[0009] Optionally, when the first support plate and the second support plate are rotated to the unfolded state, the first support plate and the second support plate are in a limiting engagement; when the first support plate and the second support plate are rotated to the folded state, the first support plate and the second support plate are in a limiting engagement.

[0010] Optionally, a first rotating shaft connection part is provided on one side of the first support plate, and a second rotating shaft connection part is provided on one side of the second support plate. The rotating shaft passes through the first rotating shaft connection part and the second rotating shaft connection part to achieve a rotatable connection.

[0011] The first pivot connection includes a first stop structure, and the second pivot connection includes a second stop structure. The first stop structure and the second stop structure abut against each other when the hinge mechanism is rotated to the unfolded state and the folded state.

[0012] Optionally, the first support plate includes a support surface and a back surface disposed opposite to the support surface, the back surface being fixedly connected to the second transmission structure.

[0013] Optionally, the back surface is provided with a clearance recess, and at least a portion of the transmission component is housed in the clearance recess.

[0014] Optionally, the first transmission structure and the second transmission structure are connected in a transmission connection; the transmission assembly further includes:

[0015] A third transmission structure is rotatably connected to the second transmission structure and the base frame, respectively.

[0016] The fourth transmission structure is fixedly connected to the housing of the electronic device; the fourth transmission structure is slidably connected to the first transmission structure and rotatably connected to the second transmission structure.

[0017] Optionally, the first transmission structure includes a third rotating shaft connecting part and a transmission connecting assembly, the transmission connecting assembly being disposed at one end of the first transmission structure in the axial direction; the rotating shaft passes through the third rotating shaft connecting part and is rotatably connected to the base frame, and the transmission connecting assembly is drively connected to the second transmission structure.

[0018] Optionally, the transmission connection assembly includes a first protrusion and a second protrusion spaced apart; the second transmission structure has a first arc-shaped guide groove at its axial end, and the first protrusion and / or the second protrusion slides in cooperation with the first arc-shaped guide groove to allow the first transmission structure and the second transmission structure to rotate relative to each other.

[0019] Optionally, one of the first transmission structure and the fourth transmission structure is provided with a first sliding groove, and the other of the first transmission structure and the fourth transmission structure is provided with a first slider; the first slider is movably assembled in the first sliding groove so that the first transmission structure and the fourth transmission structure slide relative to each other.

[0020] Optionally, one of the second transmission structure and the fourth transmission structure is provided with a second arc-shaped guide groove, and the other of the second transmission structure and the fourth transmission structure is provided with a second arc-shaped guide rail; the second arc-shaped guide rail is movably assembled to the second arc-shaped guide groove so that the second transmission structure and the fourth transmission structure can rotate relative to each other.

[0021] Optionally, the third transmission structure includes a fourth rotating shaft connection portion and a first arc-shaped guide rail disposed on one side of the fourth rotating shaft connection portion;

[0022] The second transmission structure is provided with a fifth rotating shaft connection part, and the rotating shaft passes through the fourth rotating shaft connection part and the fifth rotating shaft connection part to make the third transmission structure rotatably connected to the second transmission structure;

[0023] The base frame is provided with a third arc-shaped guide groove that matches the first arc-shaped guide rail structure. The first arc-shaped guide rail is assembled into the third arc-shaped guide groove so that the third transmission structure is rotatably connected to the base frame.

[0024] Optionally, the second transmission structure includes a third stop structure, and the third transmission structure includes a fourth stop structure; the third stop structure and the fourth stop structure abut against each other when the hinge mechanism is rotated to the unfolded state or the folded state.

[0025] Optionally, the hinge mechanism includes two sets of the transmission components and two sets of the support plate assemblies respectively cooperating with the transmission components; the hinge mechanism also includes a synchronous transmission component, and a pair of first transmission structures in the two sets of transmission components are respectively rotatably connected to the synchronous transmission component.

[0026] Optionally, the synchronous transmission assembly includes a gear transmission assembly.

[0027] According to a second aspect of this disclosure, an electronic device is provided, the electronic device including a flexible screen and any of the hinge mechanisms described in the first aspect; the hinge mechanism includes two sets of the transmission components and two sets of the support plate assemblies respectively cooperating with the transmission components, the flexible screen being assembled with the two sets of the support plate assemblies respectively.

[0028] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0029] The hinge mechanism disclosed herein utilizes a transmission component to achieve transmission between the base frame and the support plate assembly. The support plate assembly includes a first support plate and a second support plate rotatably connected to the first support plate. In the unfolded state of the hinge mechanism, the first and second support plates unfold into a support structure to support the screen. In the folded state of the hinge mechanism, the first and second support plates are bent relative to each other to create a clearance space, allowing the bent support plate assembly to match the folded screen shape. This increases the adaptability of the support plate assembly and the screen in both folded and unfolded states, and also helps to improve the space utilization of the hinge mechanism and the electronic device.

[0030] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0032] Figure 1 This is an exploded structural diagram of a hinge mechanism according to an exemplary embodiment of the present disclosure;

[0033] Figure 2 This is an exploded structural diagram of the first transmission structure, the second transmission structure, and the fourth transmission structure of a hinge mechanism according to an exemplary embodiment of the present disclosure.

[0034] Figure 3 This is a schematic diagram of a hinge mechanism in an extended state according to an exemplary embodiment of the present disclosure;

[0035] Figure 4 This is a schematic cross-sectional view of a hinge mechanism in a folded state in an exemplary embodiment of this disclosure;

[0036] Figure 5 This is a schematic cross-sectional view of a hinge mechanism in another folded state according to an exemplary embodiment of the present disclosure;

[0037] Figure 6 This is a schematic cross-sectional view of a hinge mechanism in an unfolded state according to an exemplary embodiment of this disclosure. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0039] Foldable electronic devices offer portability when folded and increase screen size when unfolded. Switching between these states typically involves a hinge mechanism. The hinge mechanism's support plate provides support during the folding and unfolding of the flexible screen, improving its reliability. However, the support effect of the support plate on the flexible screen is often limited by its structure; an excessively large support plate can negatively impact the internal spatial layout of the foldable electronic device.

[0040] This disclosure proposes a hinge mechanism. Figure 1 This is an exploded structural diagram of a hinge mechanism according to an exemplary embodiment of this disclosure, as shown below. Figure 1As shown, the hinge mechanism 1 includes a base frame 11, a transmission assembly 17, and a support plate assembly 16. The transmission assembly 17 includes a first transmission structure 12 and a second transmission structure 13. The first transmission structure 12 is rotatably connected to the base frame 11, and the second transmission structure 13 is drively connected to the first transmission structure 12. The support plate assembly 16 includes a first support plate 161 and a second support plate 162. The first support plate 161 is fixedly assembled to the second transmission structure 13. The first support plate 161 and the second support plate 162 are rotatably connected so that in the unfolded state of the hinge mechanism 1, it unfolds into a support structure, and in the folded state of the hinge mechanism 1, they bend relative to each other to form a clearance space.

[0041] The support plate assembly 16 can be used to support the screen 21 of the electronic device, so that the screen 21 obtains a similar motion trajectory to the relatively bent device body, and avoids gaps between the screen 21 and the device body during the bending process, which could cause damage.

[0042] The aforementioned hinge mechanism 1 utilizes a transmission component 17 to achieve transmission between the base frame 11 and the support plate assembly 16. The support plate assembly 16 includes a first support plate 161 and a second support plate 162 rotatably connected to the first support plate 161. In the unfolded state of the hinge mechanism 1, the first support plate 161 and the second support plate 162 unfold into a support structure to support the screen 21. In the folded state of the hinge mechanism 1, the first support plate 161 and the second support plate 162 bend relative to each other to form a clearance space, ensuring that the bent support plate assembly 16 matches the shape of the folded screen 21. This increases the adaptability of the support plate assembly 16 and the screen 21 in both folded and unfolded states, and also helps to improve the space utilization of the hinge mechanism 1 and the electronic device.

[0043] In some embodiments, when the first support plate 161 and the second support plate 162 are rotated to the unfolded state, the first support plate 161 and the second support plate 162 are in a limiting engagement. When the first support plate 161 and the second support plate 162 are rotated to the folded state, the first support plate 161 and the second support plate 162 are in a limiting engagement. Through the limiting relationship between the first support plate 161 and the second support plate 162 in the folded and unfolded states, the relative rotation angle of the first support plate 161 and the second support plate 162 can be controlled within a preset range, avoiding insufficient support effect or structural interference problems caused by excessively large or small angles.

[0044] There are multiple ways to limit the rotation between the first support plate 161 and the second support plate 162. For example, limiting components can be provided on the side, front, back or other positions of the first support plate 161 and / or the second support plate 162 so that the first support plate 161 and the second support plate 162 are limited by the limiting components when they rotate to a preset angle.

[0045] For example, a first pivot connection 1611 is provided on one side of the first support plate 161, and a second pivot connection 1621 is provided on one side of the second support plate 162. The pivot passes through the first pivot connection 1611 and the second pivot connection 1621 to achieve a rotatable connection. The first pivot connection 1611 includes a first stop structure 1612, and the second pivot connection 1621 includes a second stop structure 1622. The first stop structure 1612 and the second stop structure 1622 abut against each other when the hinge mechanism 1 is rotated to the unfolded state and the folded state. The stop structures provided in the first pivot connection 1611 and the second pivot connection 1621 avoid structural interference of the first stop structure 1612 and the second stop structure 1622 on the relative rotation of the first support plate 161 and the second support plate 162, and can also simplify the structure and reduce space occupation.

[0046] The first stop structure 1612 can be a fan-shaped structure located at the axially upward end of the first rotating shaft connecting part 1611, and the second stop structure 1622 can be a fan-shaped structure located at the axially upward end of the second rotating shaft connecting part 1621. The first stop structure 1612 and the second stop structure 1622 can limit and abut against each other during the relative rotation of the first support plate 161 and the second support plate 162. It should be noted that the fan-shaped structure can refer to a 1 / 3 cylinder, a 1 / 5 cylinder, or a cylinder of other proportions centered on the rotating shaft.

[0047] In the above embodiment, the first support plate 161 includes a support surface and a back surface opposite to the support surface. The back surface is fixedly connected to the second transmission structure 13 to simplify the structural setup and improve the reliability of the fixed connection. The support surface can cooperate with the screen 21 of the electronic device to support the screen 21.

[0048] The back side is provided with a relief recess 1613, and at least a portion of the transmission component 17 is housed in the relief recess 1613 to reduce the space occupied by the transmission component 17 in the thickness direction of the electronic device and improve the thinness and lightness of the electronic device.

[0049] In some embodiments, such as Figures 1-6As shown, the first transmission structure 12 and the second transmission structure 13 are connected in a transmission manner. The transmission assembly 17 may also include a third transmission structure 14 and a fourth transmission structure 15. The third transmission structure 14 is rotatably connected to the second transmission structure 13 and the base frame 11, respectively. The fourth transmission structure 15 is fixedly connected to the housing of the electronic device, slidably connected to the first transmission structure 12, and rotatably connected to the second transmission structure 13. Through the mutual cooperation between the first transmission structure 12, the second transmission structure 13, the third transmission structure 14, and the fourth transmission structure 15, the second transmission structure 13 can drive the first support plate 161 assembled on the second transmission structure 13 to obtain the expected movement trajectory. During the movement of the first support plate 161, the second support plate 162 rotates relative to the first support plate 161 so that in the folded state of the hinge mechanism 1, it forms a clearance space with the first support plate 161 due to relative bending. In the unfolded state of the hinge mechanism 1, it splices with the first support plate 161 to form a support structure that matches the screen 21.

[0050] The fourth transmission structure 15 can be fixedly connected to the housing of the electronic device to enable the main body of the device with the housing to obtain the expected bending trajectory.

[0051] In some embodiments, such as Figures 1-6 As shown, the first transmission structure 12 includes a third rotating shaft connecting portion 121 and a transmission connecting assembly 122. The transmission connecting assembly 122 is disposed at one axial end of the first transmission structure 12. The rotating shaft passes through the third rotating shaft connecting portion 121 and the sixth rotating shaft connecting portion 111 of the base frame 11 to achieve a rotational connection between the first transmission structure 12 and the base frame 11. The transmission connecting assembly 122 is drive-connected to the second transmission structure 13. The rotational connection between the third rotating shaft connecting portion 121 and the base frame 11, and the drive-connection between the transmission connecting assembly 122 and the second transmission structure 13, define the motion trajectory of the second transmission structure 13. This allows the second transmission structure 13 to move relative to the base frame 11 with the aid of the first transmission structure 12, and the desired motion trajectory can be obtained using the above connection method, which helps to simplify the structure of the hinge mechanism 1.

[0052] The aforementioned transmission connection assembly 122 may include a first protrusion 1221 and a second protrusion 1222 spaced apart. The second transmission structure 13 has a first arc-shaped guide groove 132 at its axial end. The first protrusion 1221 and / or the second protrusion 1222 slide in conjunction with the first arc-shaped guide groove 132, allowing the first transmission structure 12 and the second transmission structure 13 to rotate relative to each other. The placement of the first protrusion 1221 and the second protrusion 1222 can extend or assist in adjusting the movement trajectory of the second transmission structure 13, improving its movement flexibility. For example, in the first stage of relative movement between the first transmission structure 12 and the second transmission structure 13, the first protrusion 1221 is received within the first arc-shaped guide groove 132 and slides relative to it. In the second stage of relative movement between the first transmission structure 12 and the second transmission structure 13, both the first protrusion 1221 and the second protrusion 1222 are received within the second arc-shaped guide groove 133 and slide together relative to it. During the third stage of relative motion between the first transmission structure 12 and the second transmission structure 13, the second protrusion 1222 is received in the first arc-shaped guide groove 132 and slides relative to the first arc-shaped guide groove 132.

[0053] The first protrusion 1221 and the second protrusion 1222 can be cylindrical structures disposed at the upper axial end of the second transmission structure 13. The first protrusion 1221 and the second protrusion 1222 can be spaced apart in both the width and thickness directions of the hinge mechanism 1. The first protrusion 1221 and the second protrusion 1222 extend along the axial direction of the hinge mechanism 1.

[0054] Alternatively, the aforementioned transmission connection component 122 can also be a groove or slider structure, and the second transmission structure 13 can be provided with a sliding fit structure that matches the groove or slider, so as to limit the motion trajectory of the second transmission structure 13 by the relative sliding between the transmission connection component 122 and the second transmission structure 13, thereby realizing the linear or curvilinear motion of the second transmission structure 13 relative to the first transmission structure 12.

[0055] In some embodiments, such as Figures 1-6 As shown, one of the first transmission structure 12 and the fourth transmission structure 15 is provided with a first slide groove 123, and the other of the first transmission structure 12 and the fourth transmission structure 15 is provided with a first slider 152. The first slider 152 is movably assembled into the first slide groove 123 so that the first transmission structure 12 and the fourth transmission structure 15 slide relative to each other. The connection method between the slider and the slide groove has a simple structure and enables the fourth transmission structure 15 to obtain a movement trajectory relative to the first transmission structure 12. After the fourth transmission structure 15 is connected to the second transmission structure 13 and the electronic device housing, it provides corresponding motion guidance for the second transmission structure 13 and the electronic device housing.

[0056] The fourth transmission structure 15 can be connected to the electronic device housing as a connecting block, so that the main body of the device with the housing installed will bend along the expected trajectory.

[0057] In some embodiments, such as Figures 1-6 As shown, one of the second transmission structure 13 and the fourth transmission structure 15 is provided with a second arc-shaped guide groove 133, and the other of the second transmission structure 13 and the fourth transmission structure 15 is provided with a second arc-shaped guide rail 151. The second arc-shaped guide rail 151 is movably assembled to the second arc-shaped guide groove 133, so that the second transmission structure 13 and the fourth transmission structure 15 can rotate relative to each other. The matching method of the second arc-shaped guide rail 151 and the second arc-shaped guide groove 133 is simple and reliable, and also helps to optimize the structural space layout.

[0058] The third transmission structure 14 includes a fourth rotating shaft connecting part 141 and a first arc-shaped guide rail 142 disposed on one side of the fourth rotating shaft connecting part 141. The first arc-shaped guide rail 142 can be disposed on one side of the fourth rotating shaft connecting part 141 in the hinge width direction. The second transmission structure 13 has a fifth rotating shaft connecting part 131, and the rotating shaft passes through the fourth rotating shaft connecting part 141 and the fifth rotating shaft connecting part 131 to rotatably connect the third transmission structure 14 and the second transmission structure 13. The base frame 11 has a third arc-shaped guide groove 112 that matches the structure of the first arc-shaped guide rail 142. The first arc-shaped guide rail 142 is assembled into the third arc-shaped guide groove 112 to rotatably connect the third transmission structure 14 and the base frame 11. The transmission from the base frame 11 to the second transmission structure 13 is realized through the third transmission structure 14, and the second transmission structure 13 obtains the expected motion trajectory using a simple structure.

[0059] It should be noted that the first rotating shaft connecting part 1611, the second rotating shaft connecting part 1621, the third rotating shaft connecting part 121, the fourth rotating shaft connecting part 141, and the fifth rotating shaft connecting part 131 can be cylindrical structures. These cylindrical structures have axially extending shaft mounting holes to facilitate shaft passage. The first arc-shaped guide rail 142 can be an arc-shaped plate structure matching the structure of the third arc-shaped guide groove 112, and the second arc-shaped guide rail 151 can be an arc-shaped plate structure matching the structure of the second arc-shaped guide groove 133.

[0060] The second transmission structure 13 may be provided with a third stop structure, and the third transmission structure 14 may be provided with a fourth stop structure. The third and fourth stop structures abut against each other when the hinge mechanism 1 rotates to the unfolded or folded state. Providing stop structures in the second and third transmission structures 13 and 14 avoids structural interference between the third and fourth stop structures and the relative rotation of the second and third transmission structures 13 and 14, and also simplifies the structure and reduces space occupation. Specifically, the third stop structure may be a fan-shaped structure located at the axially upward end of the fifth rotating shaft connection 131, and the fourth stop structure may be a fan-shaped structure located at the axially upward end of the fourth rotating shaft connection 141. The third and fourth stop structures can limit and abut against each other during the relative rotation of the second and third transmission structures 13 and 14.

[0061] It should be noted that a sector structure can refer to a 1 / 3 cylinder, a 1 / 5 cylinder, or a cylinder of other proportions centered on the axis of rotation.

[0062] In some embodiments, the hinge mechanism 1 includes two sets of transmission components 17 and two sets of support plate assemblies 16 respectively cooperating with the transmission components 17. The hinge mechanism 1 also includes a synchronous transmission component. A pair of first transmission structures 12 in the two sets of transmission components 17 are rotatably connected to the synchronous transmission component so that the hinge mechanism 1 on both sides of the synchronous transmission component can rotate synchronously during operation.

[0063] The synchronous transmission component can be a gear transmission component or other types of synchronous transmission mechanism, and this disclosure does not limit it.

[0064] In some embodiments, when the hinge mechanism 1 includes a synchronous transmission assembly, the first transmission structure 12 can serve as a synchronizing rod, the third transmission structure 14 can serve as a virtual axis, and the fourth transmission structure 15 can serve as a connecting block connected to the electronic device housing. The second transmission structure 13 can serve as a transmission link to connect with the first transmission structure 12, the third transmission structure 14, and the fourth transmission structure 15, so that the first support plate 161 fixed to the second transmission structure 13 can obtain the expected motion trajectory.

[0065] Alternatively, the hinge mechanism 1 can be a asynchronous transmission mechanism. That is, the hinge mechanism 1 may include a set of transmission components 17 and a set of support plate assemblies 16 that cooperate with the transmission components 17. Alternatively, the hinge mechanism 1 may include two sets of transmission components and two sets of support plate assemblies 16 that are respectively cooperated with the transmission components 17. The transmission components 17 are respectively connected to the base frame 11, and there is no synchronous transmission connection between the two sets of transmission components 17.

[0066] This disclosure further provides an electronic device, which includes a flexible screen 21 and the aforementioned hinge mechanism 1. The hinge mechanism 1 includes two sets of transmission components 17 and two sets of support plate assemblies 16 respectively cooperating with the transmission components 17. The flexible screen 21 is assembled with the two sets of support plate assemblies 16 respectively.

[0067] The aforementioned hinge mechanism 1 utilizes a transmission component 17 to achieve transmission between the base frame 11 and the support plate assembly 16. The support plate assembly 16 includes a first support plate 161 and a second support plate 162 rotatably connected to the first support plate 161. In the unfolded state of the hinge mechanism 1, the first support plate 161 and the second support plate 162 unfold into a support structure to support the screen 21. In the folded state of the hinge mechanism 1, the first support plate 161 and the second support plate 162 bend relative to each other to form a clearance space, ensuring that the bent support plate assembly 16 matches the shape of the folded screen 21. This increases the adaptability of the support plate assembly 16 and the screen 21 in both folded and unfolded states, and also helps to improve the space utilization of the hinge mechanism 1 and the electronic device.

[0068] It should be noted that the aforementioned electronic devices may be mobile phones, wearable devices, tablets, televisions, advertising screens 21, vehicle terminals, medical terminals, etc., and this disclosure does not impose any restrictions on them.

[0069] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the technical solutions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0070] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A hinge mechanism, characterized in that, The hinge mechanism includes: Base frame; The transmission assembly includes a first transmission structure and a second transmission structure; the first transmission structure is rotatably connected to the base frame, and the second transmission structure is drively connected to the first transmission structure. The support plate assembly includes a first support plate and a second support plate; the first support plate is fixedly assembled to the second transmission structure; the first support plate and the second support plate are rotatably connected to unfold into a support structure in the unfolded state of the hinge mechanism, and bend relative to each other in the folded state of the hinge mechanism to form an avoidance space.

2. The hinge mechanism according to claim 1, characterized in that, When the first support plate and the second support plate rotate to the unfolded state, the first support plate and the second support plate are in a limiting engagement; when the first support plate and the second support plate rotate to the folded state, the first support plate and the second support plate are in a limiting engagement.

3. The hinge mechanism according to claim 2, characterized in that, The first support plate has a first rotating shaft connection part on one side, and the second support plate has a second rotating shaft connection part on one side. The rotating shaft passes through the first rotating shaft connection part and the second rotating shaft connection part to achieve a rotatable connection. The first pivot connection includes a first stop structure, and the second pivot connection includes a second stop structure. The first stop structure and the second stop structure abut against each other when the hinge mechanism is rotated to the unfolded state and the folded state.

4. The hinge mechanism according to claim 1, characterized in that, The first support plate includes a support surface and a back surface disposed opposite to the support surface, and the back surface is fixedly connected to the second transmission structure.

5. The hinge mechanism according to claim 4, characterized in that, The back side is provided with a clearance recess, and at least a portion of the transmission component is housed in the clearance recess.

6. The hinge mechanism according to claim 1, characterized in that, The first transmission structure and the second transmission structure are connected by a transmission connection; the transmission assembly further includes: A third transmission structure is rotatably connected to the second transmission structure and the base frame, respectively. The fourth transmission structure is fixedly connected to the housing of the electronic device; the fourth transmission structure is slidably connected to the first transmission structure and rotatably connected to the second transmission structure.

7. The hinge mechanism according to claim 6, characterized in that, The first transmission structure includes a third rotating shaft connecting part and a transmission connecting assembly. The transmission connecting assembly is disposed at one end of the first transmission structure in the axial direction. The rotating shaft passes through the third rotating shaft connecting part and is rotatably connected to the base frame. The transmission connecting assembly is drively connected to the second transmission structure.

8. The hinge mechanism according to claim 7, characterized in that, The transmission connection assembly includes a first protrusion and a second protrusion spaced apart; the second transmission structure has a first arc-shaped guide groove at its axial end, and the first protrusion and / or the second protrusion slide in cooperation with the first arc-shaped guide groove so that the first transmission structure and the second transmission structure rotate relative to each other.

9. The hinge mechanism according to claim 6, characterized in that, One of the first transmission structure and the fourth transmission structure is provided with a first sliding groove, and the other of the first transmission structure and the fourth transmission structure is provided with a first slider; the first slider is movably assembled in the first sliding groove so that the first transmission structure and the fourth transmission structure slide relative to each other.

10. The hinge mechanism according to claim 6, characterized in that, One of the second transmission structure and the fourth transmission structure is provided with a second arc-shaped guide groove, and the other of the second transmission structure and the fourth transmission structure is provided with a second arc-shaped guide rail; the second arc-shaped guide rail is movably assembled to the second arc-shaped guide groove so that the second transmission structure and the fourth transmission structure can rotate relative to each other.

11. The hinge mechanism according to claim 6, characterized in that, The third transmission structure includes a fourth rotating shaft connection part and a first arc-shaped guide rail disposed on one side of the fourth rotating shaft connection part; The second transmission structure is provided with a fifth rotating shaft connection part, and the rotating shaft passes through the fourth rotating shaft connection part and the fifth rotating shaft connection part to make the third transmission structure rotatably connected to the second transmission structure; The base frame is provided with a third arc-shaped guide groove that matches the first arc-shaped guide rail structure. The first arc-shaped guide rail is assembled into the third arc-shaped guide groove so that the third transmission structure is rotatably connected to the base frame.

12. The hinge mechanism according to claim 11, characterized in that, The second transmission structure includes a third stop structure, and the third transmission structure includes a fourth stop structure; the third stop structure and the fourth stop structure abut against each other when the hinge mechanism rotates to the unfolded state or the folded state.

13. The hinge mechanism according to claim 1, characterized in that, The hinge mechanism includes two sets of transmission components and two sets of support plate assemblies respectively engaged with the transmission components; the hinge mechanism also includes a synchronous transmission component, and a pair of first transmission structures in the two sets of transmission components are rotatably connected to the synchronous transmission component.

14. The hinge mechanism according to claim 13, characterized in that, The synchronous transmission assembly includes a gear transmission assembly.

15. An electronic device, characterized in that, The device includes a flexible screen and a hinge mechanism as described in any one of claims 1-14; the hinge mechanism includes two sets of the transmission components and two sets of the support plate assemblies respectively cooperating with the transmission components, and the flexible screen is assembled with the two sets of the support plate assemblies respectively.

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