Hinge and foldable electronic equipment
By employing a synchronous gear and reducer design in foldable electronic devices, the problem of asynchronous movement of the swing arms on both sides of the hinge is solved, achieving synchronous rotation of the swing arms and enhanced torque, thereby improving the user experience and the automation level of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING XIAOMI MOBILE SOFTWARE CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-08
AI Technical Summary
In existing hinges used in foldable electronic devices, the two swing arms are prone to asynchrony during rotation, which affects the user experience.
The first and second hinge mechanisms are symmetrically arranged and connected by the meshing of synchronous gears and swing arms. Combined with a reducer, the synchronous rotation of the swing arms is ensured. The multi-stage reduction mechanism is used to improve torque output and avoid jamming.
It achieves synchronous rotation of the swing arms on both sides of the hinge, improves the motion synchronization of foldable electronic devices, enhances the user experience, and avoids jamming or failure to flatten due to insufficient torque through the design of the reducer.
Smart Images
Figure CN224214560U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic device accessories technology, and in particular to a hinge and a foldable electronic device. Background Technology
[0002] Foldable electronic devices such as foldable phones and foldable tablets have become popular in the market. As a core component of foldable electronic devices, the hinge plays a key role in realizing the folding function.
[0003] Foldable electronic devices typically consist of two foldable bodies that are rotatably connected by a hinge. In related technologies, although existing hinges are connected to the two foldable bodies respectively through swing arms, the swing arms on both sides of the hinge may rotate asynchronously during rotation, resulting in asynchronous rotation of the two foldable bodies and affecting the user experience. Utility Model Content
[0004] In view of this, this application provides a hinge and a foldable electronic device that can improve the synchronization of the two swing arms of the hinge during movement.
[0005] Specifically, the following technical solutions are included:
[0006] In a first aspect, this application provides a hinge, the hinge comprising a first hinge mechanism and a second hinge mechanism arranged symmetrically, both the first hinge mechanism and the second hinge mechanism comprising:
[0007] The input shaft is capable of rotating around its own central axis;
[0008] A synchronizing gear and a rocker arm, wherein the rocker arm is located on one side of the synchronizing gear in the radial direction, and the rocker arm is provided with a tooth surface structure that meshes with the synchronizing gear;
[0009] The input shaft is connected to the synchronous gear or the swing arm drive, and the synchronous gear of the first hinge mechanism meshes with the synchronous gear of the second hinge mechanism.
[0010] In the technical solution provided in this application, since the swing arms in the first hinge mechanism and the second hinge architecture mesh with the synchronous gear through the tooth surface structure, and the synchronous gear of the first hinge mechanism meshes with the synchronous gear of the second hinge mechanism, the swing arms of the first hinge mechanism and the swing arms of the second hinge mechanism are linked together through the synchronous gear, ensuring that the swing arms of the first hinge mechanism and the swing arms of the second hinge mechanism can rotate synchronously, improving the motion synchronization of the swing arms on both sides when the hinge rotates, which helps to improve the motion synchronization of the first folding body and the second folding body of the foldable electronic device, and improves the user experience.
[0011] In some possible implementations, the first hinge mechanism and the second hinge mechanism further include a speed reducer, the input end of which is connected to the input shaft, and the output end of which is connected to the synchronizing gear or the swing arm.
[0012] In the technical solution provided in this application, by setting a reducer to connect the input shaft and the synchronous gear / swing arm, the output speed of the hinge is effectively controlled. The reducer can convert the high-speed, low-torque input of the hinge's input end into the low-speed, high-torque output of the swing arm, which plays the role of speed reduction and torque increase. This allows the hinge to rotate smoothly when bearing the first hinge mechanism and the second hinge mechanism, avoiding the jamming or "unflattened" phenomenon caused by insufficient torque.
[0013] In some possible implementations, the reducer includes a plurality of reduction mechanisms connected sequentially along the axial direction of the input shaft.
[0014] In the technical solution provided in this application, by setting the reducer to include multiple reduction mechanisms connected in sequence, a multi-stage series reduction mechanism is formed, which improves the reduction ratio, helps to achieve more precise reduction ratio control, and disperses the load pressure of the reducer, avoiding deformation problems caused by local stress concentration.
[0015] In some possible implementations, the plurality of reduction mechanisms include a first reduction mechanism and a second reduction mechanism connected together, wherein the input end of the first reduction mechanism is connected to the input shaft, and the output end of the second reduction mechanism is connected to the synchronous gear or the swing arm.
[0016] In the technical solution provided in this application, the power of the output shaft is sequentially transmitted to the first reduction mechanism and the second reduction mechanism, and then transmitted to the swing arm. After the two-stage reduction and torque amplification by the first reduction mechanism and the second reduction mechanism, the torque of the swing arm is increased, avoiding the phenomenon of jamming or "not flattening" caused by insufficient torque.
[0017] In some possible implementations, both the first reduction mechanism and the second reduction mechanism include a sun gear, a ring gear, a planet carrier, and a plurality of planet gears;
[0018] The plurality of planetary gears are spaced apart around the sun gear and all mesh with the sun gear; the ring gear is surrounded around the outside of the plurality of planetary gears and meshes with the plurality of planetary gears; the plurality of planetary gears are mounted on the planet carrier.
[0019] In this configuration, the sun gear of the first reduction mechanism is connected to the input shaft, the sun gear of the second reduction mechanism is connected to the planet carrier of the first reduction mechanism, and the planet carrier of the second reduction mechanism is connected to the synchronizing gear or the swing arm.
[0020] In the technical solution provided in this application, the reducer is a planetary gear reducer, which has the advantages of high transmission efficiency, high precision, compact structure, and smooth operation.
[0021] In some possible implementations, the sun gear has a first connecting hole for allowing the end of the input shaft and the end of the planet carrier of the first reduction mechanism to be inserted;
[0022] The synchronizing gear or the rocker arm has a second connecting hole, which allows the end of the planetary carrier of the second reduction mechanism to be inserted.
[0023] In the technical solution provided in this application, the zero-backlash fit between the shaft and hole improves the transmission accuracy and connection strength, avoids relative sliding between the two connected parts in the circumferential direction, and reduces motion deviation caused by assembly errors.
[0024] In some possible implementations, the cross-sectional profile of the first connecting hole and / or the second connecting hole is non-circular.
[0025] In the technical solution provided in this application, relative rotation is restricted by the shape matching between the shaft holes, and clearance-free fit between the first connecting hole and the second connecting hole and their respective connected parts is achieved, which enhances the connection strength and reliability of the shaft hole connection and prevents slippage between connected parts in the circumferential direction.
[0026] In some possible implementations, end face stops are provided on both sides of the gear ring along the axial direction. The end face stops are annular and are used to axially limit the planetary gear and the planet carrier.
[0027] In the technical solution provided in this application, by setting an end face stop, it can abut against the planetary gear or planet carrier, preventing the planetary gear and planet carrier from axial displacement due to vibration or impact, thereby enhancing the stability of the reducer and reducing noise and wear caused by part misalignment.
[0028] Secondly, this application provides a foldable electronic device, the electronic device including a hinge provided in any embodiment of the first aspect, and further including a first folding body and a second folding body, the hinge being disposed between the first folding body and the second folding body, the first folding body and the second folding body being rotatably connected by the hinge.
[0029] In some possible implementations, the electronic device further includes a drive member that is driven to the input shaft of the hinge, the drive member being used to drive the input shaft to rotate about its own central axis.
[0030] In the technical solution provided in this application, by setting a driving component, the input shaft is rotated by the driving component, and then the power is transmitted to the swing arm, so that the swing arm drives the first folding body and the second folding body to move, thereby realizing the automatic opening and closing action of the electronic device and improving the automation level of the electronic device. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 An exploded view of the hinge provided in an embodiment of this application;
[0033] Figure 2 One of the cross-sectional views of the hinge provided in the embodiments of this application;
[0034] Figure 3 A longitudinal cross-sectional view of the hinge provided in an embodiment of this application;
[0035] Figure 4 This is a second cross-sectional view of the hinge provided in an embodiment of this application.
[0036] The reference numerals in the figure indicate:
[0037] 1-First hinge mechanism; 2-Second hinge mechanism;
[0038] 11-Input shaft; 12-Synchronizing gear; 13-Swing arm; 131-Second connecting hole; 14-Reducer; 140-Reduction mechanism; 141-First reduction mechanism; 1411-Sun gear; 14111-First connecting hole; 1412-Ring gear; 14121-End face stop; 1413-Planet carrier; 1414-Planet gear; 142-Second reduction mechanism.
[0039] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0041] The directional terms used in the embodiments of this application, such as "up," "down," and "side," are generally based on the relative relationships shown in the figures. These directional terms are used merely to more clearly describe the relationships between structures, not to describe absolute directions. When the product is placed in different orientations, the orientation may change; for example, "up" and "down" may be interchanged.
[0042] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.
[0043] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0044] like Figures 1 to 4 As shown, this application embodiment provides a hinge, which includes a first hinge mechanism 1 and a second hinge mechanism 2 arranged symmetrically. Both the first hinge mechanism 1 and the second hinge mechanism 2 include an input shaft 11, a synchronous gear 12 and a swing arm 13.
[0045] The input shaft 11 can rotate along its own central axis.
[0046] The rocker arm 13 is located on one side of the synchronous gear 12 in the radial direction. The rocker arm 13 is provided with a tooth surface structure, which meshes with the synchronous gear 12.
[0047] The input shaft 11 is connected to the synchronous gear 12 or the swing arm 13 for transmission, and the synchronous gear 12 of the first hinge mechanism 1 meshes with the synchronous gear 12 of the second hinge mechanism 2.
[0048] In some embodiments, the hinge is applied to foldable electronic devices such as foldable mobile phones, foldable tablets, foldable laptops, and foldable e-readers. The foldable electronic device includes a first folding body and a second folding body, and the hinge is disposed between the first folding body and the second folding body. The first folding body and the second folding body are rotatably connected by the hinge, so that the first folding body and the second folding body are relatively unfolded or relatively folded.
[0049] In some embodiments, the swing arm 13 of the first hinge mechanism 1 is connected to the first folding body, and the swing arm 13 of the second hinge mechanism 2 is connected to the second folding body. The rotation of the swing arm 13 can drive the first folding body and the second folding body to rotate, thereby realizing the unfolding or folding action of the electronic device.
[0050] In some embodiments, the input shaft 11 is adapted to be driven by a driving component such as a motor in the electronic device. Under the drive of the driving component, the input shaft 11 rotates along its own central axis, thereby transmitting power to the swing arm 13 to realize automatic opening and closing control of the hinge. For example, the electronic device has two driving components, each of which is driven by an input shaft 11.
[0051] Figure 2 This is a sectional view obtained by cutting with a plane perpendicular to the axis of the input shaft 11, as shown below. Figure 2 As shown, the swing arms 13 of the first hinge mechanism 1 and the second hinge mechanism 2 are symmetrically arranged along the arrangement direction. The synchronizing gear 12 of the first hinge mechanism 1 and the second hinge mechanism 2 are located between the two swing arms 13. The two swing arms 13 are provided with tooth surface structures on the side near the synchronizing gear 12, so that the swing arms 13 mesh with the synchronizing gear 12 through the tooth surface structures.
[0052] Optionally, the input shaft 11 is axially connected to the swing arm 13, or the input shaft 11 is axially connected to the synchronous gear 12.
[0053] For example, when the input shaft 11 is axially connected to the swing arm 13, the synchronous gear 12 is rotatably mounted in the electronic device. The power of the input shaft 11 is transmitted to the swing arm 13, which drives the two synchronous gears 12 to rotate. Thus, the meshing between the two swing arms 13 and the two synchronous gears 12 ensures the synchronicity of the rotation of the two swing arms 13.
[0054] For example, when the input shaft 11 is axially connected to the synchronous gear 12, the power of the input shaft 11 is transmitted to the synchronous gear 12. The rotation of the synchronous gear 12 drives the two swing arms 13 to rotate, thereby ensuring the synchronicity of the rotation of the two swing arms 13 by the meshing between the two swing arms 13 and the two synchronous gears 12.
[0055] The hinge provided in this application embodiment, because the swing arm 13 in the first hinge mechanism 1 and the second hinge architecture meshes with the synchronous gear 12 through the tooth surface structure, and the synchronous gear 12 of the first hinge mechanism 1 meshes with the synchronous gear 12 of the second hinge mechanism 2, the swing arm 13 of the first hinge mechanism 1 and the swing arm 13 of the second hinge mechanism 2 are linked through the synchronous gear 12, ensuring that the swing arm 13 of the first hinge mechanism 1 and the swing arm 13 of the second hinge mechanism 2 can rotate synchronously, improving the motion synchronization of the swing arms 13 on both sides when the hinge rotates, which helps to improve the motion synchronization of the first folding body and the second folding body of the foldable electronic device, and improves the user experience.
[0056] In a further embodiment, the first hinge mechanism 1 and the second hinge mechanism 2 further include a reducer 14, the input end of which is connected to the input shaft 11, and the output end of which is connected to the synchronous gear 12 or the swing arm 13.
[0057] For example, the reducer 14 can be a planetary gear reducer, a gear set reducer, a worm gear reducer, etc.
[0058] In related technologies, due to the bottleneck of power density of micro motors and the efficiency decay of transmission systems, foldable electronic devices and hinges on the market generally suffer from insufficient torque during unfolding, resulting in an "unflattened" phenomenon that affects the display effect of electronic devices and the user experience.
[0059] In the embodiments of this application, by setting a reducer 14 to connect the input shaft 11 and the synchronous gear 12 / swing arm 13, the output speed of the hinge is effectively controlled. The reducer 14 can convert the high-speed low-torque input of the hinge input end into the low-speed high-torque output of the swing arm 13, which plays the role of speed reduction and torque increase. This allows the hinge to rotate smoothly when bearing the first hinge mechanism 1 and the second hinge mechanism 2, avoiding the phenomenon of jamming or "not flattening" caused by insufficient torque.
[0060] In some embodiments, the reducer 14 includes a plurality of reduction mechanisms 140 sequentially connected along the axial direction of the input shaft 11.
[0061] For example, the reducer 14 includes two or more reduction mechanisms 140, forming a multi-stage series reduction structure.
[0062] In this embodiment, by setting the reducer 14 to include multiple reduction mechanisms 140 connected in sequence, a multi-stage series reduction mechanism 140 is formed, which improves the reduction ratio, helps to achieve more precise reduction ratio control, and disperses the load pressure of the reducer 14, avoiding deformation problems caused by local stress concentration.
[0063] In some embodiments, the plurality of reduction mechanisms 140 include a first reduction mechanism 141 and a second reduction mechanism 142 connected together. The input end of the first reduction mechanism 141 is connected to the input shaft 11, and the output end of the second reduction mechanism 142 is connected to the synchronous gear 12 or the swing arm 13.
[0064] Figure 3 This is a sectional view obtained by cutting with a plane passing through the central axis of input shaft 11, such as... Figure 3 As shown, the first deceleration mechanism 141 and the second deceleration mechanism 142 are connected in series along the axial direction of the input shaft 11. The structure of the first deceleration mechanism 141 and the structure of the second deceleration mechanism 142 can be the same or different. In this embodiment, the first deceleration mechanism 141 and the second deceleration mechanism 142 are the same as an example for illustration.
[0065] In this embodiment, the power of the output shaft is sequentially transmitted to the first reduction mechanism 141 and the second reduction mechanism 142, and then to the swing arm 13. After the two-stage reduction and torque amplification by the first reduction mechanism 141 and the second reduction mechanism 142, the torque of the swing arm 13 is increased, avoiding the phenomenon of jamming or "not flattening" caused by insufficient torque.
[0066] In some further embodiments, such as Figure 3 and Figure 4 As shown, both the first reduction mechanism 141 and the second reduction mechanism 142 include a sun gear 1411, a gear ring 1412, a planet carrier 1413, and a plurality of planet gears 1414.
[0067] Multiple planetary gears 1414 are spaced around the sun gear 1411 and mesh with the sun gear 1411. A gear ring 1412 surrounds the outside of the multiple planetary gears 1414 and meshes with the multiple planetary gears 1414. The multiple planetary gears 1414 are mounted on the planet carrier 1413.
[0068] In this mechanism, the sun gear 1411 of the first reduction mechanism 141 is connected to the input shaft 11, the sun gear 1411 of the second reduction mechanism 142 is connected to the planet carrier 1413 of the first reduction mechanism 141, and the planet carrier 1413 of the second reduction mechanism 142 is connected to the synchronizing gear 12 or the swing arm 13.
[0069] In this embodiment, the reducer 14 is a planetary gear reducer, which has the advantages of high transmission efficiency, high precision, compact structure, and smooth operation.
[0070] like Figure 4 As shown, each sun gear 1411 meshes with three planet gears 1414, which are distributed around the outer periphery of the sun gear 1411.
[0071] The gear ring 1412 is a fixed component, which is fixedly installed inside the electronic device. The gear ring 1412 is annular and has meshing teeth on its inner sidewall. The meshing teeth form the constraint track of the planetary gear 1414, enabling the planetary gear 1414 to rotate along the meshing teeth.
[0072] For example, the central axes of the input shaft 11, the sun gear 1411, the ring gear 1412, and the planet carrier 1413 are located on the same straight line. The power transmission path of the first reduction mechanism 141 and the second reduction mechanism 142 is as follows: the sun gear 1411 rotates, which drives the planet gear 1414 to rotate along the meshing teeth of the ring gear 1412, and then drives the planet carrier 1413 to rotate around the central axis of the sun gear 1411, thus transmitting the power to the next element.
[0073] In some alternative embodiments, the sun gear 1411 has a module of 0.12 and 12 teeth; the planetary gear 1414 has a module of 0.12 and 18 teeth; the ring gear 1412 has a module of 0.12 and 48 meshing teeth; and the reducer 14 has a single-stage transmission ratio of 5.
[0074] In some embodiments, the sun gear 1411 has a first connecting hole 14111, which allows the end of the input shaft 11 and the end of the planet carrier 1413 of the first reduction mechanism 141 to be inserted.
[0075] The synchronizing gear 12 or the rocker arm 13 is provided with a second connecting hole 131, which is used to allow the end of the planetary carrier 1413 of the second reduction mechanism 142 to be inserted.
[0076] The end of the input shaft 11 is inserted into the sun gear 1411 of the first reduction mechanism 141, and the cross-sectional profile of the input shaft 11 is the same as the cross-sectional profile of the first connecting hole 14111. The end of the planet carrier 1413 of the first reduction mechanism 141 away from the input shaft 11 is inserted into the sun gear of the second reduction mechanism 142, and the cross-sectional profile of the end of the planet carrier 1413 of the first reduction mechanism 141 away from the input shaft 11 is the same as the cross-sectional profile of the first connecting hole 14111.
[0077] The planet carrier 1413 of the second reduction mechanism 142, at one end away from the input shaft 11, is inserted into the second connecting hole 131, and the cross-sectional profile of the end of the planet carrier 1413 of the second reduction mechanism 142 away from the input shaft 11 is the same as the cross-sectional profile of the second connecting hole 131.
[0078] It is understandable that the aforementioned "cross section" is the cross section obtained by cutting with a plane perpendicular to the axial direction of the input shaft 11.
[0079] Optionally, the first connecting hole 14111 is interference-fitted with the planetary carrier 1413 of the input shaft 11 / first reduction mechanism 141, and / or the second connecting hole 131 is interference-fitted with the planetary carrier 1413 of the second reduction mechanism 142, thereby improving the connection strength between the connected parts.
[0080] In this embodiment, the clearance-free fit between the shaft and hole improves transmission accuracy and connection strength, avoids relative sliding between the two connected parts along the circumference, and reduces motion deviation caused by assembly errors.
[0081] In some embodiments, the cross-sectional profile of the first connecting hole 14111 and / or the second connecting hole 131 is non-circular.
[0082] For example, the cross-sectional profile of the first connecting hole 14111 and / or the second connecting hole 131 is a non-circular shape such as D-shaped, cam-shaped, elliptical, rectangular, or triangular. Figure 2 and Figure 4 As shown, the cross-sectional profile of the first connecting hole 14111 and the second connecting hole 131 is oval.
[0083] Correspondingly, the cross-sectional profile of the input shaft 11 and the planet carrier 1413, which are engaged with the first connecting hole 14111 or the second connecting hole 131, is also non-circular.
[0084] In this embodiment, relative rotation is restricted by the shape matching between the shaft holes, achieving a clearance-free fit between the first connecting hole 14111 and the second connecting hole 131 and their respective connected parts, enhancing the connection strength and reliability of the shaft hole connection, and preventing slippage between connected parts in the circumferential direction.
[0085] In some embodiments, end face stops 14121 are provided on both sides of the gear ring 1412 in the axial direction. The end face stops 14121 are annular and are used to axially limit the planetary gear 1414 and the planet carrier 1413.
[0086] Each gear ring 1412 has two end face stops 14121, which are spaced apart along the axial direction of the gear ring 1412. The end face stops 14121 are annular plates that can abut against the planetary gear 1414 or the planet carrier 1413 to prevent the planetary gear 1414 and the planet carrier 1413 from axial displacement due to vibration or impact, thereby enhancing the stability of the reducer 14 and reducing noise and wear caused by component misalignment.
[0087] This application also provides a foldable electronic device, including the hinge provided in any of the above embodiments, and further including a first folding body and a second folding body. The hinge is disposed between the first folding body and the second folding body, and the first folding body and the second folding body are rotatably connected by the hinge.
[0088] Electronic devices can be foldable devices such as foldable phones, foldable tablets, foldable laptops, and foldable e-readers.
[0089] For example, the swing arm 13 of the first hinge mechanism 1 is connected to the first folding body, and the swing arm 13 of the second hinge mechanism 2 is connected to the second folding body. The rotation of the swing arm 13 can drive the first folding body and the second folding body to rotate, thereby realizing the unfolding or folding action of the electronic device.
[0090] In some embodiments, the electronic device further includes a drive member that is driven to the input shaft 11 of the hinge, and the drive member is used to drive the input shaft 11 to rotate about its own central axis.
[0091] The driving component can be a motor.
[0092] By setting up a driving component, the input shaft 11 is rotated, which in turn transmits power to the swing arm 13, causing the swing arm 13 to drive the first folding body and the second folding body to move, thereby realizing the automatic opening and closing action of the electronic device and improving the automation level of the electronic device.
[0093] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.
[0094] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.
[0095] It should be understood that this application is not limited to the precise structure 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 application is limited only by the appended claims.
Claims
1. A hinge, characterized in that, The hinge includes a first hinge mechanism (1) and a second hinge mechanism (2) arranged symmetrically. Both the first hinge mechanism (1) and the second hinge mechanism (2) include: The input shaft (11) is capable of rotating along its own central axis; Synchronous gear (12) and rocker arm (13), wherein the rocker arm (13) is located on one side of the synchronous gear (12) in the radial direction, and the rocker arm (13) is provided with a tooth surface structure, which meshes with the synchronous gear (12); The input shaft (11) is connected to the synchronous gear (12) or the swing arm (13) in a transmission connection, and the synchronous gear (12) of the first hinge mechanism (1) meshes with the synchronous gear (12) of the second hinge mechanism (2). The first hinge mechanism (1) and the second hinge mechanism (2) further include a reducer (14), the input end of which is connected to the input shaft (11), and the output end of which is connected to the synchronous gear (12) or the swing arm (13).
2. The hinge according to claim 1, characterized in that, The reducer (14) includes a plurality of reduction mechanisms (140) connected sequentially along the axial direction of the input shaft (11).
3. The hinge according to claim 2, characterized in that, The plurality of reduction mechanisms (140) include a first reduction mechanism (141) and a second reduction mechanism (142) connected together. The input end of the first reduction mechanism (141) is connected to the input shaft (11), and the output end of the second reduction mechanism (142) is connected to the synchronous gear (12) or the swing arm (13).
4. The hinge according to claim 3, characterized in that, Both the first reduction mechanism (141) and the second reduction mechanism (142) include a sun gear (1411), a gear ring (1412), a planet carrier (1413), and a plurality of planet gears (1414). A plurality of planetary gears (1414) are spaced apart around the sun gear (1411) and all mesh with the sun gear (1411). A gear ring (1412) surrounds the outside of the plurality of planetary gears (1414) and meshes with the plurality of planetary gears (1414). The plurality of planetary gears (1414) are mounted on the planet carrier (1413). The sun gear (1411) of the first reduction mechanism (141) is connected to the input shaft (11), the sun gear (1411) of the second reduction mechanism (142) is connected to the planet carrier (1413) of the first reduction mechanism (141), and the planet carrier (1413) of the second reduction mechanism (142) is connected to the synchronous gear (12) or the swing arm (13).
5. The hinge according to claim 4, characterized in that, The sun gear (1411) has a first connecting hole (14111) for allowing the end of the input shaft (11) and the end of the planet carrier (1413) of the first reduction mechanism (141) to be inserted. The synchronizing gear (12) or the swing arm (13) is provided with a second connecting hole (131), which is used to allow the end of the planet carrier (1413) of the second reduction mechanism (142) to be inserted.
6. The hinge according to claim 5, characterized in that, The cross-sectional profile of the first connecting hole (14111) and / or the second connecting hole (131) is non-circular.
7. The hinge according to claim 4, characterized in that, The gear ring (1412) has end face stop portions (14121) on both sides along the axial direction. The end face stop portions (14121) are annular and are used to axially limit the planetary gear (1414) and the planet carrier (1413).
8. A foldable electronic device, characterized in that, The electronic device includes the hinge according to any one of claims 1 to 7, and further includes a first folding body and a second folding body, wherein the hinge is disposed between the first folding body and the second folding body, and the first folding body and the second folding body are rotatably connected by the hinge.
9. The electronic device according to claim 8, characterized in that, The electronic device also includes a drive unit, which is driven to the input shaft (11) of the hinge, and the drive unit is used to drive the input shaft (11) to rotate around its own central axis.