Rotating shaft mechanism and foldable electronic device

Abstract

A rotating shaft mechanism (10c) and a foldable electronic device (1). The rotating shaft mechanism (10c) movably connects a moving assembly (300), a synchronization structure (400), a first damping module (510), and at least one second damping module (520) between a main shaft (100) and connecting plates, so as to implement synchronous movement of the connecting plates on two sides relative to the main shaft (100), and provide a damping force for the rotating shaft mechanism (10c). By means of separately arranging different components for implementing different functions, the interference between different components is reduced, the risks of failure are distributed to the components, and the probability of component failure can be reduced. In addition, by means of dividing the rotating shaft mechanism (10c) into an upper shaft part (101), a middle shaft part (102), and a lower shaft part (103) along the length direction, the structures of the upper shaft part (101) and the lower shaft part (103) are symmetrically arranged, so that the stability and smoothness of the rotating shaft mechanism (10c) during movement is improved. In addition, in the upper shaft part (101) and the lower shaft part (103), by means of arranging the moving assembly (300), the synchronization structure (400), and the first damping module (510) sequentially from an end portion of the rotating shaft mechanism (10c) to the center, the structure of the rotating shaft mechanism (10c) is more reasonable, and the movement stability and accuracy of the rotating shaft mechanism (10c) can be improved.

Description

Hinge mechanism and foldable electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 19, 2023, with application number 202322555479.2 and application name “Hinge mechanism and foldable electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electronic devices, and in particular to a hinge mechanism and a foldable electronic device. Background Art

[0003] The bendable nature of foldable screens allows electronic devices equipped with them, also known as foldable electronic devices, to switch between unfolded and folded states. Foldable electronic devices offer a large display area and are easy to carry, making them increasingly popular with consumers.

[0004] The hinge mechanism, the core functional structure of a foldable electronic device, is used to achieve relative rotation between the two main parts of the foldable electronic device, thereby realizing the expansion or folding of the foldable screen. When the two main parts rotate to be coplanar, the foldable electronic device is in an expanded state, in which the foldable screen is in an expanded state, with a larger display area. When the two main parts rotate to overlap, the foldable electronic device is in a folded state, with a smaller volume and the foldable screen in a folded state.

[0005] However, the existing rotating shaft mechanism has an unreasonable structural structure, the failure risk of the components on the rotating shaft mechanism is high, and the reliability of the rotating shaft mechanism is low.

[0006] Summary of the Invention

[0007] The present application provides a hinge mechanism and a foldable electronic device. The structure of the hinge mechanism is more reasonable, which can reduce the failure risk of components on the hinge mechanism and improve the reliability of the hinge mechanism.

[0008] One aspect of the present application provides a hinge mechanism for use in a foldable electronic device. The hinge mechanism includes an upper shaft portion, a middle shaft portion, and a lower shaft portion sequentially arranged along a length direction. The upper shaft portion and the lower shaft portion are symmetrically arranged. The hinge mechanism includes:

[0009] spindle;

[0010] Connecting plates, located on both sides of the main shaft in the width direction;

[0011] and a motion assembly, a synchronization structure, a first damping module, and at least one second damping module movably connected between the main shaft and the connecting plate, wherein the first damping module generates a damping force in the area where the main shaft is located, and the second damping module generates a damping force in the area where the connecting plate is located;

[0012] Among them, in the upper shaft part and the lower shaft part, from the end of the rotating shaft mechanism to the center of the rotating shaft mechanism, the motion component, the synchronization structure and the first damping module are arranged in sequence; at least one second damping module is arranged in the middle shaft part, and each second damping module includes two second damping modules, and the two second damping modules are respectively connected to the connecting plates on both sides of the main shaft.

[0013] The present invention provides a rotating shaft mechanism that flexibly connects a motion assembly, a synchronization structure, a first damping module, and at least one second damping module between a main shaft and a connecting plate to achieve motion of the connecting plate relative to the main shaft, ensure synchronous motion of the connecting plates on both sides of the main shaft, and provide damping force for the rotating shaft mechanism, thereby meeting all functional requirements of the rotating shaft mechanism. By separately arranging different components that perform different functions, interference between different components is reduced, and the risk of failure is distributed among the components, thereby reducing the probability of component failure and improving the reliability of the rotating shaft mechanism. Furthermore, by dividing the rotating shaft mechanism into an upper shaft portion, a middle shaft portion, and a lower shaft portion along its length, the upper and lower shaft portions are symmetrically arranged, which helps improve the stability and smoothness of the rotating shaft mechanism during movement. Furthermore, by arranging the motion assembly, synchronization structure, and first damping module in the upper and lower shaft portions from the ends of the rotating shaft mechanism toward the center, the rotating shaft mechanism has a more rational architecture, which helps improve the stability, accuracy, and reliability of the rotating shaft mechanism.

[0014] In one possible embodiment, the motion assembly includes a main swing arm and an auxiliary swing arm located at the upper shaft portion and the lower shaft portion, and the main swing arm and the auxiliary swing arm are arranged adjacent to each other;

[0015] One end of the main swing arm is connected to the main shaft in a sliding and rotatable manner, and the other end of the main swing arm is connected to the connecting plate on the corresponding side in a sliding and rotatable manner; one end of the auxiliary swing arm is connected to the main shaft in a sliding and rotatable manner, and the other end of the auxiliary swing arm is connected to the connecting plate on the corresponding side in a sliding manner.

[0016] The main swing arm and auxiliary swing arm work together to drive the connecting plate to move relative to the main shaft. Both the main swing arm and auxiliary swing arm are located close to the ends of the rotating shaft mechanism, which can better guide the movement of the rotating shaft mechanism and constrain its trajectory. By slidably and rotationally connecting both ends of the main swing arm to the main shaft and the connecting plate, the main swing arm has a large degree of freedom of movement and can cooperate with the adapter plate to stably support the bendable portion of the folding screen. By slidably and rotationally connecting the auxiliary swing arm to the main shaft and slidably connecting the auxiliary swing arm to the connecting plate, the auxiliary swing arm has sufficient degrees of freedom to meet the requirements of the connecting plate's relative movement to the main shaft.

[0017] In a possible implementation, the auxiliary swing arm is located on a side of the end of the main swing arm away from the rotating shaft mechanism.

[0018] By setting the auxiliary swing arm on the side of the main swing arm away from the end of the rotating shaft mechanism, the main swing arm is closer to the end of the rotating shaft mechanism. The main swing arm is used to guide the motion and constrain the trajectory of both ends of the rotating shaft mechanism, which can better guide and constrain the overall movement of the rotating shaft mechanism to improve the accuracy of the movement of the rotating shaft mechanism.

[0019] In a possible embodiment, the motion assembly further includes an auxiliary swing arm located at the central axis, one end of the auxiliary swing arm is movably connected to the main shaft, and the other end of the auxiliary swing arm is connected to the connecting plate.

[0020] By providing an auxiliary swing arm that works in conjunction with the main and secondary swing arms, the connection between the connecting plate and the main shaft is more reliable, and the movement of the rotating shaft mechanism is more stable and smooth. Furthermore, motion guidance and trajectory constraints are implemented for each area along the longitudinal direction of the rotating shaft mechanism, resulting in better balance and higher precision in the movement of the rotating shaft mechanism.

[0021] In a possible implementation, one end of the auxiliary swing arm is slidably and rotatably connected to the main shaft, and the other end of the auxiliary swing arm is slidably and rotatably connected to the connecting plate.

[0022] By making both ends of the auxiliary swing arm slidingly and rotationally connected to the main shaft and the connecting plate, the connecting plate can be rotated and translated relative to the main shaft, which has a better trajectory constraint effect on the central axis, and the auxiliary swing arm has a greater degree of freedom. The adapter plate can also be connected to the auxiliary swing arm.

[0023] In a possible implementation, the auxiliary swing arm is disposed between the first damping module and the second damping module.

[0024] By arranging the auxiliary swing arm between the first damping module and the second damping module, the auxiliary swing arm can separate the first damping module from the second damping module. The assist force provided by the auxiliary swing arm can weaken the damping effect of the damping mechanism and ensure smooth movement of the rotating shaft mechanism.

[0025] In a possible embodiment, the connecting plates on both sides of the main shaft are provided with threading grooves, the threading grooves on the connecting plates on both sides are arranged opposite to each other, and the threading grooves are located in the middle shaft portion.

[0026] By providing threading slots on the connecting plates on both sides of the main shaft and symmetrically arranging the threading slots on both sides, the flexible circuit board can be smoothly threaded through the threading slots on both connecting plates, ensuring the reliability of the flexible circuit board during repeated bending. In addition, by locating the threading slots in the central axis, sufficient space for the threading slots is ensured, which also facilitates the connection of the flexible circuit board to the components on both sides of the rotating shaft mechanism.

[0027] In a possible implementation, the number of the second damping module is one, and the two second damping modules are arranged on the same side of the wire threading groove, or the two second damping modules are respectively arranged on both sides of the wire threading groove.

[0028] In one possible implementation, the synchronization structure includes:

[0029] Two synchronous swing arms; the first ends of the two synchronous swing arms are respectively rotatably connected to the two sides of the width direction of the main shaft, and rotate synchronously and in opposite directions; the second ends of the two synchronous swing arms are respectively slidably connected to the connecting plates on both sides of the main shaft.

[0030] By making the first ends of the two synchronous swing arms rotate synchronously and in opposite directions, the second ends of the two synchronous swing arms are driven to rotate synchronously and in opposite directions, and the second ends of the two synchronous swing arms slide along the connecting plates on both sides to guide the connecting plates on both sides, so that the connecting plates on both sides drive the first shell and the second shell to move synchronously.

[0031] In a possible implementation, the first ends of the two synchronous swing arms are each provided with a synchronous gear, and the two synchronous gears are meshed with each other.

[0032] By arranging synchronous gears at the first ends of the two synchronous swing arms, the two synchronous gears mesh with each other, and the transmission effect between the two synchronous gears enables the first ends of the two synchronous swing arms to rotate synchronously and in opposite directions.

[0033] In a possible implementation, the first damping module includes:

[0034] Two support shafts, the two support shafts are spaced apart along the width direction of the main shaft;

[0035] The damping structure is sleeved on the two supporting shafts and generates a damping force in the area where the main shaft is located.

[0036] By arranging two supporting shafts on the main shaft as a supporting basis, the damping structure is sleeved on the two supporting shafts. As the connecting plate moves relative to the main shaft, the damping structure damps the force in the area where the main shaft is located.

[0037] In one possible implementation, the damping structure includes:

[0038] Two driving members; the two driving members are respectively sleeved on the two supporting shafts and rotate synchronously and in opposite directions;

[0039] The elastic component is sleeved on the two supporting shafts and abuts against the two driving members. The driving members rotate and squeeze the elastic component to drive the elastic component to deform.

[0040] By respectively sleeved two driving members on two supporting shafts, and sleeved the elastic component on the two supporting shafts, the elastic component is abutted against the driving member, and the driving member rotates with the movement of the rotating shaft mechanism to squeeze the elastic component, driving the elastic component to deform, thereby generating a damping force in the area where the main shaft is located.

[0041] In a possible implementation, the second damping module includes:

[0042] The damping swing arm has one end connected to the main shaft for rotation and the other end connected to the connecting plates on both sides of the main shaft for sliding connection;

[0043] The damping assembly is arranged corresponding to the connecting plate on the corresponding side and abuts against the damping swing arm; the damping assembly is squeezed and deformed by the damping swing arm to generate a damping force in the area where the connecting plate is located.

[0044] A damping swing arm is provided, one end of which is rotatably connected to the main shaft, while the other end slides along connecting plates on either side of the main shaft. Damping components are provided on the corresponding connecting plates. During the movement of the rotating shaft mechanism, as the damping swing arm slides along the connecting plates, it compresses the damping component, causing it to deform and generate a damping force in the area where the connecting plates are located.

[0045] In a possible embodiment, a mounting groove is provided on the damping swing arm, and an avoidance opening is provided at one end of the damping swing arm facing the main shaft, and the avoidance opening is communicated with the mounting groove;

[0046] The damping assembly is clamped in the mounting groove, and the damping assembly passes through the avoidance opening on the side facing the main shaft and abuts against the side wall of the main shaft; as the connecting plate moves relative to the main shaft, the damping assembly slides along the side wall of the main shaft and produces elastic deformation in the width direction of the main shaft.

[0047] A mounting slot is defined in the damping swing arm, and a clearance opening is defined at the end of the damping swing arm facing the spindle, communicating with the mounting slot. The damping assembly is then positioned within the mounting slot, passing through the clearance opening and abutting the sidewall of the spindle. As the connecting plate moves relative to the spindle, the damping assembly slides along the sidewall of the spindle, which squeezes the damping assembly, causing it to elastically deform across the width of the spindle, thereby varying the damping force provided by the damping assembly.

[0048] In one possible implementation, the damping assembly includes a bracket assembly and at least one elastic member;

[0049] The bracket assembly abuts against the side wall of the main shaft and slides along the side wall of the main shaft; one end of the elastic member abuts against the bracket assembly, and the other end of the elastic member abuts against the inner side wall of the installation groove away from the main shaft.

[0050] In a possible implementation, the rotating shaft mechanism further includes:

[0051] The adapter plate is located between the connecting plate and the main shaft and is connected to the motion component.

[0052] When the movement path (bending radius) of the bendable part of the folding screen is large, for example, when the folding screen is applied to an outward-folding electronic device, the movement path (bending radius) of the bendable part of the folding screen is larger than the movement path of the hinge mechanism. Therefore, the space occupied by the bendable part of the folding screen is larger. By adding an adapter plate between the connecting plate and the main shaft, the main shaft and the adapter plate jointly support the bendable part, thereby increasing the contact area between the hinge mechanism and the bendable part. Moreover, driven by the motion component, the adapter plate can change its posture as the shape of the bendable part changes, so as to support the bendable part in accordance with the shape. In this way, the support strength of the hinge mechanism for the bendable part of the folding screen is enhanced, the force balance of the bendable part is improved, and it is ensured that the bendable part has sufficient strength and stability in any posture.

[0053] In a possible implementation, when the foldable electronic device is in a folded state, the folding screen is arranged outside the connecting plates on both sides of the main axis.

[0054] When the hinge mechanism is in a folded state, the folding screen is arranged on the outside of the hinge mechanism, and the hinge mechanism is used in outward-folding electronic devices.

[0055] Another aspect of the present application provides a foldable electronic device, comprising a first housing, a second housing, a folding screen, and the aforementioned hinge mechanism;

[0056] The connecting plates on both sides of the hinge mechanism are connected to the first shell and the second shell respectively. The folding screen is mounted on the first shell and the second shell, and the folding screen is supported by the hinge mechanism.

[0057] The present application provides a foldable electronic device comprising a first housing, a second housing, a hinge mechanism, and a foldable screen. The hinge mechanism comprises a motion assembly, a synchronization structure, a first damping module, and at least one second damping module movably connected between a main shaft and a connecting plate to enable movement of the connecting plate relative to the main shaft, ensure synchronous movement of the connecting plates on both sides of the main shaft, and provide damping force for the hinge mechanism, thereby meeting all functional requirements of the hinge mechanism. By separately arranging different components for different functions, interference between different components is reduced, the risk of failure is distributed among the components, the probability of component failure is reduced, and the reliability of the hinge mechanism is improved. Furthermore, by dividing the hinge mechanism into an upper shaft portion, a middle shaft portion, and a lower shaft portion along its length, the upper and lower shaft portions are arranged symmetrically, which helps improve the stability and smoothness of the hinge mechanism during movement. Furthermore, by arranging the motion assembly, synchronization structure, and first damping module in the upper and lower shaft portions from the ends of the hinge mechanism toward the center, the hinge mechanism has a more rational architecture, which helps improve the stability, accuracy, and reliability of the hinge mechanism during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 is a schematic structural diagram of a foldable electronic device in an unfolded state provided by an embodiment of the present application;

[0059] FIG2 is a schematic structural diagram of the foldable electronic device shown in FIG1 in a folded state;

[0060] FIG3 is a schematic diagram of the exploded structure of a foldable electronic device provided in an embodiment of the present application;

[0061] FIG4 is a front perspective structural diagram of the rotating shaft mechanism provided in an embodiment of the present application in an expanded state;

[0062] FIG5 is a front perspective structural diagram of the rotating shaft mechanism in FIG4 in a folded state;

[0063] FIG6 is a rear perspective structural diagram of the rotating shaft mechanism in FIG4 in an expanded state;

[0064] FIG7 is an exploded structural diagram of the rotating shaft mechanism in FIG4 ;

[0065] FIG8 is a front view of the rotating shaft mechanism in FIG4;

[0066] FIG9 is a partial enlarged view of the rotating shaft mechanism at point A in FIG4 from a formal perspective;

[0067] FIG10 is a cross-sectional view of the section AA in FIG9 ;

[0068] FIG11 is a partial exploded structural diagram of the main swing arm and the adapter plate provided in an embodiment of the present application;

[0069] FIG12 is a cross-sectional view at BB in FIG9 ;

[0070] FIG13 is a cross-sectional view corresponding to the section BB in FIG9 when the rotating shaft mechanism is in a folded state;

[0071] FIG14 is a partial enlarged view of point B in FIG4 ;

[0072] FIG15 is a partial enlarged view of point C in FIG4 ;

[0073] FIG16 is a partial enlarged view of point D in FIG4 ;

[0074] FIG17 is a schematic structural diagram of the main shaft of the rotating shaft mechanism in FIG4;

[0075] FIG18 is an exploded structural diagram of the main shaft in FIG17 . DETAILED DESCRIPTION

[0076] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0077] The present invention provides a foldable electronic device, including but not limited to a mobile phone, a tablet personal computer, a laptop computer, a notebook computer, a personal digital assistant (PDA), a personal computer, a multimedia player, an e-book reader, an in-vehicle device, or a wearable device. The wearable device includes but is not limited to a smart bracelet, a smart watch, a smart head-mounted display, and smart glasses.

[0078] Figure 1 is a schematic diagram of the structure of a foldable electronic device provided in an embodiment of the present application when in an unfolded state; Figure 2 is a schematic diagram of the structure of the foldable electronic device shown in Figure 1 when in a folded state. With reference to Figures 1 and 2, this embodiment is described using a foldable mobile phone as an example.

[0079] The foldable electronic device 1 can be used in different states in different usage scenarios. FIG. 1 shows the foldable electronic device 1 in an unfolded state, where the unfolding angle α of the foldable electronic device 1 is, for example, 180°. In this state, the foldable electronic device 1 can achieve a large screen display. FIG. 2 shows the foldable electronic device 1 in a folded state. In this state, the foldable electronic device 1 is compact and easy to carry.

[0080] It should be noted that the angles illustrated in this embodiment are all allowed to have slight deviations. For example, the unfolding angle α of the foldable electronic device 1 shown in Figure 1 is 180°, which means that the unfolding angle α can be 180° or approximately 180°, such as 170°, 175°, 185°, or 190°. The angles illustrated in the following examples should be understood in the same way.

[0081] In addition, the foldable electronic device 1 shown in Figures 1 and 2 is an electronic device that can be folded once. The electronic device includes two parts that can rotate relative to each other. When the two parts rotate to be coplanar, the foldable electronic device 1 is in an unfolded state (as shown in Figure 1). When the two parts rotate to overlap each other, the foldable electronic device 1 is in a folded state (as shown in Figure 2). In other embodiments, the foldable electronic device 1 can also be an electronic device that can be folded multiple times (more than twice). In this case, the foldable electronic device 1 can include multiple parts that are connected by sequential rotation. Two adjacent parts can be relatively separated to unfold to the unfolded state, and the two adjacent parts can also be relatively close to fold to the folded state.

[0082] Figure 3 is a schematic diagram of the exploded structure of a foldable electronic device provided in an embodiment of the present application. Referring to Figure 3, the foldable electronic device 1 includes a shell assembly 10 and a folding screen 20. The folding screen 20 is supported and connected to one side surface of the shell assembly 10. The side surface of the folding screen 20 facing away from the shell assembly 10 is its display surface (not shown in the figure). The display surface is used to display information and provide an interactive interface for the user. In this embodiment, the display surface of the folding screen 20 is defined as its front side, and the other side surface of the folding screen 20 opposite to the front side is defined as its back side. That is, the front side of the folding screen 20 is exposed outside the shell assembly 10, and the back side of the folding screen 20 faces the shell assembly 10 and is connected to the shell assembly 10. Accordingly, the side surface of the shell assembly 10 facing the folding screen 20 is defined as the front side of the shell assembly 10, and the side surface of the shell assembly 10 facing away from the folding screen 20 is defined as the back side of the shell assembly 10.

[0083] In this embodiment, the folding screen 20 can be, but is not limited to, an organic light-emitting diode (OLED) display, an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED) display, a mini organic light-emitting diode (MID) display, a micro organic light-emitting diode (MID) display, a micro organic light-emitting diode (MID) display, or a quantum dot light-emitting diode (QLED) display, etc.

[0084] The foldable screen 20 may include a first non-bending portion 21, a second non-bending portion 22, and a bendable portion 23, with the bendable portion 23 located between the first non-bending portion 21 and the second non-bending portion 22. During use of the foldable electronic device 1, the first non-bending portion 21 and the second non-bending portion 22 remain planar, while the bendable portion 23 can bend to change the angle between the first non-bending portion 21 and the second non-bending portion 22, so that the foldable screen 20 folds or unfolds with the movement of the housing assembly 10, thereby enabling the foldable electronic device 1 to switch between a folded state and an unfolded state.

[0085] For example, in the foldable screen 20, at least the bendable portion 23 is made of a flexible material to enable the bendable portion 23 to be bendable. The first non-bending portion 21 and the second non-bending portion 22 can be made of a flexible material, a rigid material, or partially of a rigid material and partially of a flexible material, which is not limited in this embodiment.

[0086] Driven by the shell assembly 10, the folding screen 20 can switch between the unfolded state and the folded state. As shown in Figures 1 and 3, when the folding screen 20 is in the unfolded state, the first non-bending portion 21 and the second non-bending portion 22 are in a relatively distant unfolded state, the bendable portion 23 is in a flattened state without bending, and the first non-bending portion 21, the second non-bending portion 22 and the bendable portion 23 are oriented in the same direction and are in a coplanar state. At this time, the angle between the first non-bending portion 21 and the second non-bending portion 22 is 180°. The folding screen 20 can achieve a large-screen display, provide users with richer information, and bring users a better user experience.

[0087] As shown in Figures 2 and 3 , when the foldable screen 20 is in the folded state, the first non-bending portion 21 and the second non-bending portion 22 are stacked relative to each other, and the bendable portion 23 is in a bent state, with the bending angle of the bendable portion 23 being, for example, 180°. In this state, the foldable electronic device 1 is compact, making it easy to carry and store.

[0088] It should be noted that the foldable electronic device 1 shown in the figure is an outward-folding electronic device. When in the folded state, the first non-bending portion 21 and the second non-bending portion 22 of the foldable screen 20 face each other, and the housing assembly 10 is located between the first non-bending portion 21 and the second non-bending portion 22. The foldable screen 20 is enclosed outside the housing assembly 10 and is visible to the user. When an outward-folding electronic device is in the folded state, the foldable screen 20 is exposed and can be used to perform a display function. Therefore, there is no need to add an additional display screen on the back of the housing to realize the display function of the foldable electronic device 1 in the folded state.

[0089] In other examples, the foldable electronic device 1 may also be an inward-folding electronic device. When in the folded state, the first non-bending portion 21 and the second non-bending portion 22 of the foldable screen 20 are relatively flat, the bendable portion 23 can be bent, and the housing assembly 10 protects the foldable screen 20 from being scratched by hard objects. If the inward-folding electronic device needs to provide a display function in the folded state, a display screen can be added to the back of the housing. The foldable electronic device 1 relies on this display screen to provide the display function when in the folded state.

[0090] Additionally, in some embodiments, the foldable electronic device 1, particularly an inward-folding electronic device, can hover at an angle between the unfolded and folded states. For example, the hovering angle of the foldable electronic device 1 can be 120°, 130°, 140°, or 150°. The housing assembly 10 can rely on the damping force provided by the housing assembly 10 to cause the housing assembly 10 to hover in a semi-expanded state between the folded and unfolded states, with the foldable screen 20 remaining in the semi-expanded state along with the housing assembly 10. At this point, the bendable portion 23 of the foldable screen 20 is also bent, and the degree of bending of the bendable portion 23 is less than that in the folded state. The first non-bending portion 21 and the second non-bending portion 22 of the foldable screen 20 are relatively inclined, with the angle between the first non-bending portion 21 and the second non-bending portion 22 being, for example, 120°, 130°, 140°, or 150°.

[0091] The housing assembly 10 is used to support and secure the foldable screen 20 and to switch the foldable screen 20 between the folded and unfolded states. Referring to Figure 3 , the housing assembly 10 includes a first housing 10a, a second housing 10b, and a hinge mechanism 10c. The hinge mechanism 10c is connected between the first and second housings 10a, 10b. The hinge mechanism 10c rotatably connects the first and second housings 10a, 10b, thereby enabling relative rotation between the first and second housings 10a, 10b.

[0092] The first housing 10a supports and fixes the first non-bending portion 21 of the folding screen 20, and the second housing 10b supports and fixes the second non-bending portion 22 of the folding screen 20. In other words, the first non-bending portion 21 of the folding screen 20 is fixedly connected to the first housing 10a, and the second non-bending portion 22 of the folding screen 20 is fixedly connected to the second housing 10b. The bendable portion 23 of the folding screen 20 is arranged corresponding to the hinge mechanism 10c. When the hinge mechanism 10c drives the first housing 10a and the second housing 10b to rotate relative to each other, the first non-bending portion 21 and the second non-bending portion 22 of the folding screen 20 change their orientation accordingly, and the bendable portion 23 of the folding screen 20 bends or flattens as the orientation of the first non-bending portion 21 and the second non-bending portion 22 changes.

[0093] The hinge mechanism 10c drives the first housing 10a and the second housing 10b to rotate relative to each other, allowing the foldable electronic device 1 to switch between a folded state and an unfolded state. The first housing 10a and the second housing 10b can rotate away from each other until they are coplanar. At this point, the housing assembly 10 is in the unfolded state, and the foldable screen 20 is in the unfolded state as the housing assembly 10 unfolds, as shown in FIG1 . The first housing 10a and the second housing 10b can also rotate toward each other until they are relatively stacked. At this point, the housing assembly 10 is in the folded state, and the foldable screen 20 is in the folded state as the housing assembly 10 folds, as shown in FIG2 .

[0094] For example, the first housing 10a may have a support surface facing the first non-bending portion 21 of the folding screen 20, and the first non-bending portion 21 of the folding screen 20 is attached to the support surface of the first housing 10a. For example, the first non-bending portion 21 of the folding screen 20 is bonded to the support surface of the first housing 10a. Similarly, the second housing 10b may have a support surface facing the second non-bending portion 22 of the folding screen 20, and the second non-bending portion 22 of the folding screen 20 is attached to the support surface of the second housing 10b. For example, the second non-bending portion 22 of the folding screen 20 is bonded to the support surface of the second housing 10b.

[0095] In addition, both the first shell 10a and the second shell 10b may have a storage space, and the storage space is used to install some functional components of the foldable electronic device 1 (not shown in the figure), for example, the storage space is used to install some components such as circuit boards, batteries, camera modules, microphones, speakers, etc. Exemplarily, circuit boards may be provided in both the first shell 10a and the second shell 10b, and electrical connection between the components in the two shells is achieved through the circuit boards in the two shells; the battery for powering the components may be provided only in the first shell 10a or the second shell 10b, or batteries may be provided in both the first shell 10a and the second shell 10b; as for other components such as the camera module, microphone, speaker, etc., they may be concentrated in the first shell 10a or the second shell 10b, or some components may be provided in the first shell 10a and some components may be provided in the second shell 10b.

[0096] The first shell 10a and the second shell 10b may both include a middle frame (not shown in the figure) and a back cover (not shown in the figure). The middle frame is connected between the folding screen 20 and the back cover. The side surface of the middle frame facing the folding screen 20 forms the above-mentioned support surface. The folding screen 20 can be mounted on this side surface of the middle frame. The back cover is connected to the side of the middle frame facing away from the folding screen 20. The middle frame and the back cover together enclose a storage space for installing devices.

[0097] The hinge mechanism 10c generally includes a main shaft and connecting components movably connected to both sides of the main shaft, and the connecting components on both sides are respectively connected to the first shell 10a and the second shell 10b. The connecting components on both sides move synchronously relative to the main shaft to drive the relative movement of the first shell 10a and the second shell 10b, thereby realizing the switching of the foldable electronic device 1 between the unfolded state and the folded state. Among them, the main shaft and the connecting components on both sides are connected with components such as a motion component (including a main swing arm and a secondary swing arm), a synchronization structure, and a damping module. The motion component is used to realize the movement of the connecting component relative to the main shaft, the synchronization structure is used to synchronize the movement of the connecting components on both sides of the main shaft, and the damping module is used to provide a damping force.

[0098] To save space in the rotating shaft mechanism, related technologies either combine the damping module and the motion component (such as the auxiliary swing arm) into a single integrated module, or combine the synchronization structure and the motion component (such as the auxiliary swing arm) into a single integrated module. With such designs, if a component fails in these combined integrated modules, the entire module will fail, increasing the risk of component failure on the rotating shaft mechanism and affecting its reliability. Furthermore, if a component fails, the entire module needs to be replaced, increasing the maintenance cost of the rotating shaft mechanism.

[0099] In light of this, the present invention improves the rotating shaft mechanism by flexibly connecting a motion assembly, a synchronization structure, a first damping module, and at least one second damping module between the main shaft and the connecting plate. This allows the connecting plate to move relative to the main shaft, ensuring the synchronous movement of the connecting plates on both sides of the main shaft, and providing damping force for the rotating shaft mechanism, thereby meeting all functional requirements of the rotating shaft mechanism. By separately arranging different components that perform different functions, interference between the different components is reduced, the risk of failure is distributed among the components, and the probability of component failure is reduced, thereby improving the reliability of the rotating shaft mechanism. Furthermore, by dividing the rotating shaft mechanism into an upper shaft portion, a middle shaft portion, and a lower shaft portion along its length, the upper and lower shaft portions are arranged symmetrically, which helps to improve the stability and smoothness of the rotating shaft mechanism during movement. Furthermore, by arranging the motion assembly, synchronization structure, and first damping module in the upper and lower shaft portions, from the ends of the rotating shaft mechanism toward the center, the rotating shaft mechanism has a more rational architecture, which helps to improve the stability, accuracy, and reliability of the rotating shaft mechanism.

[0100] The following is a detailed description of the rotating shaft mechanism 10c of the embodiment of the present application.

[0101] Figure 4 is a front-view stereoscopic structural diagram of the rotating shaft mechanism provided in an embodiment of the present application when it is in an unfolded state; Figure 5 is a front-view stereoscopic structural diagram of the rotating shaft mechanism in Figure 4 when it is in a folded state; and Figure 6 is a rear-view stereoscopic structural diagram of the rotating shaft mechanism in Figure 4 when it is in an unfolded state.

[0102] 4 and 5 , the hinge mechanism 10c includes a main shaft 100 and a connecting assembly 200. The main shaft 100 is the main support structure of the hinge mechanism 10c, and the connecting assembly 200 is movably connected to both sides of the main shaft 100. The connecting assemblies 200 on both sides of the main shaft 100 are respectively connected to the first shell 10a and the second shell 10b. The main shaft 100 can extend along the side edges of the opposite sides of the first shell 10a and the second shell 10b. The main shaft 100 is equivalent to the rotation axis of the shell assembly 10, and the first shell 10a and the second shell 10b rotate about the length direction of the main shaft 100. The connecting assemblies 200 on both sides of the main shaft 100 move synchronously relative to the main shaft 100, thereby driving the synchronous relative movement of the first shell 10a and the second shell 10b, thereby realizing the switching of the shell assembly 10 between the unfolded state and the folded state.

[0103] The hinge mechanism 10c also includes several components connected between the main shaft 100 and the connecting assembly 200, such as the motion assembly 300, the synchronization structure 400, and the damping mechanism 500, which will be described later. These components can be movably connected between the main shaft 100 and the connecting assembly 200. The motion assembly 300 is used to achieve rotation and translation of the connecting assembly 200 relative to the main shaft 100, so that the hinge mechanism 10c drives the first shell 10a and the second shell 10b to move relative to each other, achieving the switching of the shell assembly 10 between the unfolded state and the folded state. The synchronization structure 400 is used to synchronize the movement of the connecting assemblies 200 on both sides of the main shaft 100 relative to the main shaft 100, so that the first shell 10a and the second shell 10b rotate and translate synchronously, ensuring the stability and reliability of the movement of the shell assembly 10. The damping mechanism 500 is used to provide a damping force to ensure the stability of the shell assembly 10 in the unfolded state, the folded state, and the state transition process, thereby improving the operating feel of the foldable device.

[0104] 4 , the figure shows the state where the connecting components 200 on both sides of the main shaft 100 are deployed on both sides of the main shaft 100. The connecting components 200 on both sides of the main shaft 100 are coplanar with the main shaft 100. At this time, the hinge mechanism 10c is in the deployed state, and the foldable electronic device 1 is also in the deployed state. Referring to FIG. 5 , the figure shows the state where the connecting components 200 on both sides of the main shaft 100 are close to each other and folded on one side of the main shaft 100 (in the thickness direction). The connecting components 200 on both sides of the main shaft 100 are nearly perpendicular to the main shaft 100 and are arranged opposite each other. At this time, the hinge mechanism 10c is in the folded state, and the foldable electronic device 1 is also in the folded state.

[0105] For ease of description, in this embodiment, the side surface of the hinge mechanism 10c used to support the folding screen 20 is defined as its front surface, and the side surface of the hinge mechanism 10c facing away from the folding screen 20 is defined as its back surface. Specifically, the front surface of the main shaft 100 and the front surface of the connecting assembly 200 are the surfaces of the two supporting the folding screen 20, and the back surface of the main shaft 100 and the back surface of the connecting assembly 200 are the surfaces of the two facing away from the folding screen 20.

[0106] When the hinge mechanism 10c is used in an outward-folding electronic device, the foldable screen 20 is wrapped around the outside of the hinge mechanism 10c when the hinge mechanism 10c is folded. In other words, when the hinge mechanism 10c is folded, the foldable screen 20 is connected to the opposite surfaces of the two connecting components 200. The opposite surfaces of the two connecting components 200 are considered the front surfaces of the connecting components 200, and the surfaces of the two connecting components 200 that face each other are considered the front surfaces of the connecting components 200.

[0107] As shown in Figures 4 and 5, in order to facilitate the connection between the hinge mechanism 10c and the folding screen 20, structural components (such as grooves, screws, etc.) on the main shaft 100 and the connecting component 200 for accommodating and fixing components such as the motion component 300, the synchronization structure 400 and the damping mechanism 500 can be set on the back of the hinge mechanism 10c, and components such as the motion component 300, the synchronization structure 400 and the damping mechanism 500 can be exposed on the back of the hinge mechanism 10c. On the one hand, when the outward-folding electronic device is in a folded state, the backs of the connecting components 200 on both sides of the main shaft 100 are close to and opposite to each other. By installing components such as the motion component 300, the synchronization structure 400 and the damping mechanism 500 on the side where the back of the hinge mechanism 10c is located, the assembly and cooperation between these components are facilitated; on the other hand, the integrity of the front of the hinge mechanism 10c can be maintained to a large extent, so that the front of the main shaft 100 and the front of the connecting component 200 can maintain a larger surface area and higher flatness (see Figure 6), which helps to increase the connection area between the folding screen 20 and the main shaft 100 and the connecting component 200, enhance the connection strength between the folding screen 20 and the hinge mechanism 10c, and improve the stability and reliability of the bendable portion 23 of the folding screen 20.

[0108] When the hinge mechanism 10c is used in an inward-folding electronic device, when the hinge mechanism 10c is in the folded state, the hinge mechanism 10c is disposed around the outside of the bendable portion 23 of the foldable screen 20. In other words, when the hinge mechanism 10c is in the folded state, the foldable screen 20 is connected to the facing surfaces of the two connecting components 200. The facing surfaces of the two connecting components 200 are the front surfaces of the connecting components 200, and the opposite surfaces of the two connecting components 200 are the back surfaces of the connecting components 200.

[0109] To ensure more rational and precise assembly and coordination of components such as the motion assembly 300, synchronization mechanism 400, and damping mechanism 500, these components are typically positioned on the opposite sides of the connecting assembly 200, taking the hinge mechanism 10c in its folded state as an example. For inward-folding electronic devices, these components are positioned on the side of the hinge mechanism 10c facing the folding screen 20. In other words, these components can be exposed on the front of the hinge mechanism 10c, and structural components such as slots or screws for accommodating and securing these components can be located on the front of the main shaft 100 and connecting assembly 200.

[0110] The following description will be made by taking the hinge mechanism 10c applied to an outward-folding electronic device as an example. In the folded state, the opposite surfaces of the connecting components 200 on both sides of the main shaft 100 are the front surfaces of the connecting components 200.

[0111] FIG7 is an exploded structural diagram of the rotating shaft mechanism in FIG4 . Referring to FIG7 , the connecting assembly 200 disposed on both sides of the spindle 100 includes connecting plates 210 . The connecting plates 210 are located on both sides of the spindle 100 in the width direction. The connecting plates 210 on both sides of the spindle 100 are connected to the first housing 10a and the second housing 10b , respectively. For example, the connecting plates 210 and the first housing 10a (second housing 10b) are planarly aligned and are fastened to the connecting plates 210 and the first housing 10a (second housing 10b) by screws, or are welded or bonded to the connecting plates 210 and the first housing 10a (second housing 10b) .

[0112] The connecting plates 210 are movably connected to the main shaft 100 via the aforementioned motion assembly 300, synchronization structure 400, damping mechanism 500, and other components, enabling the two connecting plates 210 to rotate and translate relative to the central main shaft 100. The two connecting plates 210 drive relative movement between the first housing 10a and the second housing 10b, enabling the housing assembly 10 to switch between the deployed and folded states. Furthermore, this ensures the synchronous movement of the connecting plates 210 on either side of the main shaft 100 and provides a damping force for the connecting plates 210, ensuring the synchronous movement of the first housing 10a and the second housing 10b, and providing the damping force required to maintain the stability and reliability of the housing assembly 10 during the deployed and folded states, as well as during state transitions.

[0113] For outward-folding electronic devices, since the foldable screen 20 is wrapped around the hinge mechanism 10c when in the folded state, the movement path (bending radius) of the foldable screen 20 when transitioning from the unfolded state to the folded state is greater than the movement path (bending radius) of the hinge mechanism 10c. To meet the bending requirements of the foldable screen 20 of an outward-folding electronic device, the bendable portion 23 of the foldable screen 20 of an outward-folding electronic device is generally larger than that of the foldable screen 20 of an inward-folding electronic device. In other words, the bendable portion 23 is wider in the width direction of the hinge mechanism 10c.

[0114] 7 , in order to stably support the bendable portion 23 of the foldable screen 20, in this embodiment, the connecting assembly 200 provided on both sides of the main shaft 100 may further include an adapter plate 220. The adapter plates 220 on both sides of the main shaft 100 are respectively located between the connecting plate 210 and the main shaft 100 on the corresponding side, and the adapter plates 220 are movably connected between the main shaft 100 and the connecting plate 210. When the hinge mechanism 10c supports the foldable screen 20, the main shaft 100 and the adapter plate 220 can correspond to the bendable portion 23 of the foldable screen 20. In other words, the main shaft 100 and the adapter plate 220 jointly support the bendable portion 23 of the foldable screen 20; the connecting plates 210 located outside the adapter plates 220 on both sides can respectively correspond to the first non-bending portion 21 (the area near the bendable portion 23) and the second non-bending portion 22 (the area near the bendable portion 23). In other words, the connecting plates 210 on both sides respectively support the first non-bending portion 21 and the second non-bending portion 22.

[0115] The adapter plate 220 can be positioned by means of a motion assembly 300 movably connected between the main shaft 100 and the connecting plate 210. During the rotation of the hinge mechanism 10c, the motion assembly 300 drives the adapter plate 220 to rotate and translate relative to the main shaft 100. Furthermore, the motion trajectory of the adapter plate 220 is not restricted by the connecting plate 210. The adapter plate 220 can change its posture as the shape of the bendable portion 23 of the foldable screen 20 changes, so that the orientation of the adapter plate 220 always matches the bendable portion 23 of the foldable screen 20. Regardless of the bending posture of the bendable portion 23 (for example, in the flattened state, folded state, or during the transition between the two states), the adapter plate 220 can contact the corresponding area of ​​the bendable portion 23, thereby stably supporting the corresponding area of ​​the bendable portion 23.

[0116] By adding an adapter plate 220 between the main shaft 100 and the connecting plate 210, the space occupied by the entire hinge mechanism 10c is increased. The main shaft 100 and the adapter plate 220 jointly support the bendable portion 23 of the folding screen 20, increasing the contact area between the hinge mechanism 10c and the bendable portion 23. In addition, the adapter plate 220 can change its posture as the shape of the bendable portion 23 changes, ensuring that the bendable portion 23 can be supported by the adapter plate 220 in any posture, which is equivalent to the adapter plate 220 being able to support the bendable portion 23 in accordance with the shape. In this way, the support strength of the hinge mechanism 10c for the bendable portion 23 of the folding screen 20 is enhanced, the force balance of the bendable portion 23 is improved, and the bendable portion 23 is ensured to have sufficient strength and stability in any posture, which helps to improve the reliability of the bendable portion 23.

[0117] As for the connection between the hinge mechanism 10c and the foldable screen 20, in actual applications, the main shaft 100 of the hinge mechanism 10c generally corresponds to the center of the bendable portion 23 of the foldable screen 20. When the bendable portion 23 is in different postures, the position and shape of the center of the bendable portion 23 relative to the main shaft 100 hardly change. Therefore, the center of the bendable portion 23 can be bonded to the main shaft 100. The connecting plates 210 located on both sides of the main shaft 100 and at the outermost side of the hinge mechanism 10c correspond to the first non-bending portion 21 and the second non-bending portion 22 of the foldable screen 20, respectively. Therefore, the portion of the foldable screen 20 corresponding to the connecting plates 210 can also be bonded to the connecting plates 210. As for the adapter plate 220 located between the main shaft 100 and the connecting plate 210, since the adapter plate 220 corresponds to the part of the bendable portion 23 of the folding screen 20 that needs to be deformed, the adapter plate 220 and the folding screen 20 do not need to be connected. The adapter plate 220 only contacts the folding screen 20 and supports the bendable portion 23, and will not restrict the bending of the bendable portion 23.

[0118] Of course, for an outward-folding electronic device with a smaller volume and a smaller width of the bendable portion 23 of the folding screen 20 (in the width direction of the hinge mechanism 10c), or in other words, the movement path (bending radius) of the bendable portion 23 of the folding screen 20 of the outward-folding electronic device is shorter, the bendable portion 23 of the folding screen 20 can also be supported by only the main shaft 100, and no additional adapter plates 220 are provided on both sides of the main shaft 100; for an outward-folding electronic device with a larger volume and a larger width of the bendable portion 23 of the folding screen 20 (in the width direction of the hinge mechanism 10c), or in other words, the movement path (bending radius) of the bendable portion 23 of the folding screen 20 of the outward-folding electronic device is longer, adapter plates 220 need to be provided on both sides of the main shaft 100. There is no limit on the number of adapter plates 220, and one or more adapter plates 220 can be provided according to actual needs.

[0119] Continuing with FIG7 , in this embodiment, the damping mechanism 500 connected between the main shaft 100 and the connecting assembly 200 may include a first damping module 510 and a second damping module 520. The first damping module 510 is primarily used to generate a damping force in the area where the main shaft 100 is located, and the second damping module 520 is primarily used to generate a damping force in the area where the connecting plate 210 is located. The first damping module 510 and the second damping module 520 cooperate to provide a suitable damping force for the hinge mechanism 10c, ensuring that the hinge mechanism 10c has sufficient damping force, ensuring that the folding screen 20 can be quickly and smoothly flattened, improving the user's operating feel, and ensuring the use effect of the foldable electronic device 1.

[0120] The coupling of the first damping module 510 and the second damping module 520 compensates for the insufficient damping force of the second damping module 520 due to yielding during long-term use, providing sufficient damping force to ensure smooth flattening of the hinge mechanism 10c without the need for external force, thus ensuring the unfolding of the foldable electronic device 1 and enhancing the user experience. Simultaneously, the damping force of the second damping module 520 balances the damping force of the first damping module 510, preventing the main shaft 100 from being pulled and affecting the flatness of the foldable screen 20 in the unfolded state. This prevents the hinge mechanism 10c from over-expanding, ensures the flatness of the foldable screen 20 in the unfolded state, and enhances the stability of the housing assembly 10 in the unfolded state.

[0121] Among them, since the second damping module 520 generates damping force in the area where the connecting plate 210 is located, the second damping module 520 is mainly set corresponding to the connecting plate 210. In order to keep the damping force provided by the second damping module 520 balanced, the second damping module 520 can be set in groups. Each second damping module 520 includes two second damping modules 520a, and the two second damping modules 520a correspond to the connecting plates 210 on both sides of the main shaft 100, respectively. In other words, the two second damping modules 520a are respectively connected to the connecting plates 210 on both sides of the main shaft 100.

[0122] Continuing with Figure 7 , in this embodiment, the components connected between the main shaft 100 and the connecting assembly 200, each used to perform different functions, are independently configured. In other words, the motion assembly 300 is solely responsible for driving the connecting assembly 200 to move (rotate and translate) relative to the main shaft 100 to ensure the accuracy of the connecting assembly 200's motion trajectory; the synchronization mechanism 400 is solely responsible for achieving synchronized movement of the connecting assemblies 200 on both sides of the main shaft 100 relative to the main shaft 100; and the damping mechanism 500 (first damping module 510 and second damping module 520) is solely responsible for providing damping force for the rotating shaft mechanism 10c.

[0123] The components used to achieve different functions are independent of each other and are not connected. Therefore, there is no interference between the components. If one component fails, it will not affect the other components. For example, if the motion component 300 fails, only the motion component 300 needs to be replaced, and the synchronization structure 400 and the damping mechanism 500 will not be affected. This arrangement can disperse the failure risk to each component, reduce the probability of component failure, and improve the reliability of the rotating shaft mechanism 10c. In addition, the rotating shaft mechanism 10c has fewer components to replace due to failure, which can reduce the maintenance cost of the rotating shaft mechanism 10c. In addition, it is easier to assemble the various components of the rotating shaft mechanism 10c, which helps to improve the assembly efficiency of the rotating shaft mechanism 10c.

[0124] FIG8 is a front view of the rotating shaft mechanism in FIG4. Referring to FIG8, according to the structural design of the rotating shaft mechanism 10c, in this embodiment, the rotating shaft mechanism 10c can be divided into an upper shaft portion 101, a middle shaft portion 102, and a lower shaft portion 103 along the length direction of the rotating shaft mechanism 10c. It should be understood that the upper shaft portion 101, the middle shaft portion 102, and the lower shaft portion 103 mentioned here are only divided according to the structural layout of the components on the rotating shaft mechanism 10c, and do not mean that the rotating shaft mechanism 10c is composed of these three parts.

[0125] 7 and 8 , among the components connected to the main shaft 100 and the connecting assembly 200, at least part of the motion assembly 300 is located at the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c, the synchronization structure 400 is located at the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c, the first damping module 510 in the damping mechanism 500 is located at the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c, and the second damping module 520 is located at the middle shaft portion 102 of the rotating shaft mechanism 10c.

[0126] In this way, the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c are both connected to the motion assembly 300. The motion assembly 300 can stably and securely connect the main shaft 100 and the connecting assembly 200, ensuring the integrity and stability of the rotating shaft mechanism 10c. The motion assembly 300 can also drive the connecting assemblies 200 on both sides to move smoothly and smoothly relative to the main shaft 100. The upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c are both connected to the synchronization structure 400, which can provide synchronous guidance to both the upper and lower sides of the rotating shaft mechanism 10c to ensure the consistency and reliability of the movement of the rotating shaft mechanism 10c.

[0127] By arranging the first damping modules 510 on both the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c, the first damping modules 510 of the upper shaft portion 101 and the lower shaft portion 103 apply damping force on the upper side and the lower side of the rotating shaft mechanism 10c respectively, thereby providing sufficient damping force for the rotating shaft mechanism 10c and ensuring the balance of the damping force applied to the rotating shaft mechanism 10c as a whole, avoiding the situation where one side of the rotating shaft mechanism 10c in the length direction is subjected to a large damping force and the other side is subjected to a small damping force, so as not to affect the operating feel and service life of the rotating shaft mechanism 10c. In addition, by setting the second damping module 520 on the middle axis portion 102 of the hinge mechanism 10c, the second damping module 520 is located between the first damping modules 510 on both sides, so that the overall force balance of the hinge mechanism 10c can be maintained, so as to better exert the coupling effect of the second damping module 520 and the first damping module 510, ensure the unfolding effect and flatness of the foldable electronic device, and improve the stability of the foldable electronic device.

[0128] This embodiment does not limit the number of first damping modules 510 provided on the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c. Similarly, the number of second damping modules 520 provided on the middle shaft portion 102 is also not limited. The design can be based on the volume of the rotating shaft mechanism 10c and the required damping force. It is best if the damping force provided by the first damping module 510 and the second damping module 520 can balance the overall force of the rotating shaft mechanism 10c.

[0129] For example, the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c can each be provided with a first damping module 510, and the middle shaft portion 102 can be provided with a second damping module 520, and the two second damping modules 520a of the second damping module 520 are respectively connected between the main shaft 100 and the connecting plate on the corresponding side.

[0130] Continuing with reference to Figures 7 and 8, the structure on the hinge mechanism 10c for passing the flexible printed circuit (FPC) is also arranged on the middle axis portion 102 of the hinge mechanism 10c. For example, the threading groove 216 opened on the connecting plate for passing the flexible printed circuit is located in the middle area of ​​the connecting plate. That is, the threading groove 216 is located on the middle axis portion 102 of the hinge mechanism 10c. The middle axis portion 102 has fewer components and there is enough space to set the threading groove 216.

[0131] The threading slots 216 on the connecting plates on either side of the spindle 100 are positioned opposite each other to facilitate smooth threading of the flexible printed circuit board (FPC) through these slots. This also ensures the FPC's reliability during repeated bending and flexing as the hinge mechanism 10c moves. After passing through the threading slots 216 located in the central shaft portion 102, the FPC extends into the middle of the first and second housings on either side, facilitating connection with components within the first and second housings.

[0132] When only one second damping module 520 is provided on the central shaft section of the rotating shaft mechanism 10c, since the threading slots 216 on the connecting plates on both sides of the main shaft 100 are symmetrically arranged, in some examples, to save space, the two second damping modules 520a can be symmetrically arranged on the same side of the threading slot 216. Of course, if there is sufficient space in the rotating shaft mechanism 10c, the two second damping modules 520a can also be located on either side of the threading slot 216. In this way, the overall symmetry of the damping mechanism is improved, and the damping force provided to the rotating shaft mechanism 10c is more balanced.

[0133] By arranging the motion component 300, the synchronization structure 400 and the first damping module 510 on the upper shaft portion 101 and the lower shaft portion 103 of the hinge mechanism 10c, and arranging the second damping module 520 and the threading groove 216 on the middle shaft portion 102 of the hinge mechanism 10c, the overall structure of the hinge mechanism 10c is made more reasonable, which can ensure the overall force balance of the hinge mechanism 10c and make the hinge mechanism 10c move steadily and smoothly, thereby ensuring the overall stability of the shell assembly and improving the reliability of the foldable electronic device.

[0134] 8 , in this embodiment, the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c can be symmetrically designed. In other words, the structures of the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c can be symmetrically arranged, and the components arranged on the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c are completely symmetrical with the (lengthwise) central axis of the rotating shaft mechanism 10c as the symmetry axis. In this way, the overall symmetry of the rotating shaft mechanism 10c is better, the force is more balanced, which helps to improve the stability and consistency of the rotating shaft mechanism 10c, and is conducive to improving the stability and smoothness of the rotating shaft mechanism 10c during movement, extending the service life of the rotating shaft mechanism 10c, and improving the user experience.

[0135] Furthermore, within the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c, arranged in the direction from the end of the main shaft 100 to the center of the main shaft 100, are the motion assembly 300, the synchronizing structure 400, and the first damping module 510. In other words, within the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c, the motion assembly 300 is arranged near the end of the rotating shaft mechanism 10c, the synchronizing structure 400 is arranged adjacent to the motion assembly 300, and the synchronizing structure 400 is located on the side of the motion assembly 300 facing away from the end of the rotating shaft mechanism 10c. The first damping module 510 is located on the side of the synchronizing structure 400 facing away from the motion assembly 300, and the first damping module 510 is arranged relatively close to the center of the rotating shaft mechanism 10c.

[0136] By setting the motion components 300 at both ends of the longitudinal direction of the rotating shaft mechanism 10c, the motion components 300 can constrain the two ends of the rotating shaft mechanism 10c, ensure the accuracy of the motion trajectory of the two ends of the rotating shaft mechanism 10c, thereby ensuring the accuracy of the overall motion trajectory of the rotating shaft mechanism 10c and improving the consistency of the rotating shaft mechanism 10c.

[0137] When designing the rotating shaft mechanism 10c, in theory, the motion component 300 itself can be relied upon to ensure the synchronous movement of the connecting components 200 on both sides of the main shaft 100. However, due to the gap between the connecting component 200 and the main shaft 100, the accuracy of the synchronous movement of the connecting components 200 on both sides will be affected. By setting a synchronization structure 400 on the adjacent side of the motion component 300, the motion trajectory of the motion components 300 on both sides of the main shaft 100 is constrained under the action of the synchronization structure 400, thereby ensuring the synchronous movement of the connecting components 200 on both sides of the main shaft 100.

[0138] By positioning the first damping module 510 on the side of the synchronizing structure 400 facing away from the motion assembly 300, the first damping module 510 is positioned in close proximity to the synchronizing structure 400. This makes the layout of the upper shaft portion 101 and the lower shaft portion 103 of the rotating shaft mechanism 10c more compact, fully utilizing the space between the upper shaft portion 101 and the lower shaft portion 103, and facilitating the overall layout design of the rotating shaft mechanism 10c. Furthermore, an appropriate spacing can be provided between the first damping module 510 and the second damping module 520 provided on the middle shaft portion 102 of the rotating shaft mechanism 10c, thereby enhancing the coupling effect between the first damping module 510 and the second damping module 520, and providing a more balanced damping force on the rotating shaft mechanism 10c, thereby improving the balance and reliability of the rotating shaft mechanism 10c.

[0139] The motion assembly 300 movably connected between the main shaft 100 and the connecting assembly 200 is described in detail below.

[0140] Figure 9 is a partial enlarged view of point A of the rotating shaft mechanism in Figure 4 from a formal perspective; Figure 10 is a cross-sectional view of point AA in Figure 9; Figure 11 is a partial exploded structural diagram of the main swing arm and the adapter plate provided in an embodiment of the present application; Figure 12 is a cross-sectional view of point BB in Figure 9; Figure 13 is a cross-sectional view corresponding to point BB in Figure 9 when the rotating shaft mechanism is in a folded state.

[0141] As shown in Figures 7 and 9, the motion component 300 includes a main swing arm 310 and a secondary swing arm 320 located at the upper shaft portion 101 and the lower shaft portion 103. The main swing arm 310 is the main transmission component between the main shaft 100 and the connecting component 200. The secondary swing arm 320 cooperates with the main swing arm 310 to realize the transmission function between the main shaft 100 and the connecting plate 210, so as to enhance the connection strength between the connecting plate 210 and the main shaft 100, so that the connecting plate 210 can move stably relative to the main shaft 100.

[0142] By positioning the main swing arm 310 and the auxiliary swing arm 320 near both ends of the rotating shaft mechanism 10c, and by positioning them adjacent to each other, the main swing arm 310 and the auxiliary swing arm 320 jointly guide the movement of the rotating shaft mechanism 10c, and together constrain the motion trajectory of both ends of the rotating shaft mechanism 10c. In this way, both arms act on both ends of the rotating shaft mechanism 10c, effectively constraining the motion trajectory and over a wide range of action, thereby ensuring the smooth and precise movement of the rotating shaft mechanism 10c.

[0143] Among them, as the main transmission component between the main shaft 100 and the connecting component 200, the transmission action of the main swing arm 310 can realize the rotation and translation (away from or closer) of the connecting component 200 relative to the main shaft 100, so as to realize the switching of the shell component 10 between the unfolded state and the folded state.

[0144] Taking a foldable electronic device as an example, when the foldable electronic device 1 is converted from an unfolded state to a folded state, the main swing arm 310 drives the connecting plate 210 to rotate relative to the main shaft 100 toward the side away from the folding screen 20, and the connecting plates 210 on both sides of the main shaft 100 approach each other to be arranged oppositely. At the same time, the main swing arm 310 drives the connecting plate 210 to move toward the direction close to the main shaft 100, reducing the gap between the connecting plate 210 and the main shaft 100, so as to provide sufficient deformation space for the bendable portion 23 of the folding screen 20 to change from a flat state to a bent state; in the foldable During the process of converting the electronic device 1 from a folded state to an unfolded state, the main swing arm 310 drives the connecting plate 210 to rotate relative to the main axis 100 toward the side where the folding screen 20 is located, and the connecting plates 210 on both sides of the main axis 100 move away from each other to be arranged in the same plane. At the same time, the main swing arm 310 drives the connecting plate 210 to move away from the main axis 100, increasing the gap between the connecting plate 210 and the main axis 100, so as to provide the stretching space required for the bendable portion 23 of the folding screen 20 to change from a bent state to a flattened state, thereby ensuring that the bendable portion 23 of the folding screen 20 can be smoothly flattened.

[0145] In addition, the adapter plate 220 located on both sides of the main shaft 100 can also be connected to the main swing arm 310, relying on the main swing arm 310 to fix the adapter plate 220 and drive the adapter plate 220 to move, so as to meet the need of the adapter plate 220 to change its posture as the shape of the bendable part 23 of the folding screen 20 changes, so that the adapter plate 220 can stably support the bendable part 23 of the folding screen 20 in any posture.

[0146] As a transmission member between the connecting plate 210 and the main shaft 100, similar to the main swing arm 310, the auxiliary swing arm 320 can drive the connecting plate 210 to rotate relative to the main shaft 100, and the auxiliary swing arm 320 can enable the connecting plate 210 to move away from or close to the main shaft 100 to change the gap between the connecting plate 210 and the main shaft 100, which will not be repeated here.

[0147] As for the relative positions of the main swing arm 310 and the auxiliary swing arm 320, in some embodiments, the main swing arm 310 can be positioned near the end of the rotating shaft mechanism 10c, and the auxiliary swing arm 320 can be positioned on the side of the main swing arm 310 that faces away from the end of the rotating shaft mechanism 10c. By positioning the main swing arm 310, which serves as the primary transmission component, at both ends of the rotating shaft mechanism 10c, the main swing arm 310 guides the movement of both ends of the rotating shaft mechanism 10c, constraining the motion trajectory of both ends of the rotating shaft mechanism 10c. Consequently, the motion assembly 300 can better constrain the overall motion trajectory of the rotating shaft mechanism 10c, thereby improving the accuracy of the movement of the rotating shaft mechanism 10c.

[0148] In other embodiments, the auxiliary swing arm 320 may be positioned near the end of the rotating shaft mechanism 10c, while the main swing arm 310 is positioned on the side of the auxiliary swing arm 320 facing away from the end of the rotating shaft mechanism 10c. Since the main swing arm 310 and the auxiliary swing arm 320 are positioned in close proximity, the main swing arm 310 is also close to the end of the rotating shaft mechanism 10c. This allows the main swing arm 310 to still effectively guide and constrain the movement trajectory, ensuring smooth and precise movement of the rotating shaft mechanism 10c.

[0149] Specifically, as shown in FIG10 , in this embodiment, the end of the main swing arm 310 close to the main shaft 100 can be slidably and rotatably connected to the main shaft 100, and the end of the main swing arm 310 close to the connecting plate 210 can also be slidably and rotatably connected to the connecting plate 210. In other words, the two ends of the main swing arm 310 can rotate around the main shaft 100 and the connecting plate 210 respectively, so as to realize the rotation of the connecting plate 210 relative to the main shaft 100; and the two ends of the main swing arm 310 can slide relative to the main shaft 100 and the connecting plate 210 respectively, so as to realize the connection plate 210 away from or close to the main shaft 100, change the size of the gap between the connecting plate 210 and the main shaft 100, and provide the deformation space required for the bendable portion 23 of the folding screen 20 to switch between the flattened state and the bent state.

[0150] In addition, in the case where the adapter plate 220 is fixed by the main swing arm 310, by making the two ends of the main swing arm 310 slidingly and rotatably connected to the main shaft 100 and the connecting plate 210 respectively, the main swing arm 310 has a large degree of freedom of movement, and the posture of the main swing arm 310 is not restricted by the rotation angle of the connecting plate 210. The main swing arm 310 can cooperate with the posture of the adapter plate 220 to maintain the adapter plate 220 in a posture that can stably support the bendable part 23 of the folding screen 20.

[0151] As an embodiment, the main swing arm 310 may include a first arcuate sliding portion 311 and a second arcuate sliding portion 312. The first arcuate sliding portion 311 is provided corresponding to the main shaft 100, and the second arcuate sliding portion 312 is provided corresponding to the connecting plate 210. Accordingly, the main shaft 100 may be provided with a first arcuate slot 104, and the connecting plate 210 may be provided with a second arcuate slot 211. The first arcuate sliding portion 311 of the main swing arm 310 extends into the first arcuate slot 104 on the main shaft 100, and the first arcuate sliding portion 311 slides along the first arcuate slot 104. The second arcuate sliding portion 312 of the main swing arm 310 extends into the second arcuate slot 211 on the connecting plate 210, and the second arcuate sliding portion 312 slides along the second arcuate slot 211. This allows the connecting plate 210 to rotate about the main shaft 100 and simultaneously move the connecting plate 210 away from or toward the main shaft 100.

[0152] As for the connection between the main swing arm 310 and the adapter plate 220, as shown in FIG11 , in some embodiments, a positioning post 313 may extend from a side surface of the main swing arm 310 facing the adapter plate 220. The adapter plate 220 may be provided with a positioning hole 221, and the positioning post 313 may extend into the positioning hole 221 to achieve positioning of the main swing arm 310 and the adapter plate 220. For example, the outer wall surface of the positioning post 313 and the inner wall surface of the positioning hole 221 may be welded or adhesively connected to securely connect the main swing arm 310 and the adapter plate 220. The number and shape of the positioning posts 313 (positioning holes 221) may be set based on the shape and volume of the main swing arm 310, and this embodiment does not impose any restrictions on this.

[0153] 12 and 13 , in this embodiment, the end of the auxiliary swing arm 320 facing the main shaft 100 can be connected to the main shaft 100 in a sliding and rotational manner, and the end of the auxiliary swing arm 320 facing the connecting plate 210 can be connected to the connecting plate 210 in a sliding manner. Thus, the auxiliary swing arm 320 has sufficient degrees of freedom between the connecting plate 210 and the main shaft 100 to meet the requirements of rotation and translation of the connecting plate 210 relative to the main shaft 100. Furthermore, there can be no connection between the auxiliary swing arm 320 and the adapter plate 220, which does not restrict the movement of the adapter plate 220 and ensures the flexibility of the movement of the auxiliary swing arm 320.

[0154] As an embodiment, the main shaft 100 may further be provided with a third arcuate groove 105, the connecting plate 210 may be provided with a first slide groove 212, and the auxiliary swing arm 320 may include a third arcuate sliding portion 321 and a first slide plate portion 322. The third arcuate sliding portion 321 of the auxiliary swing arm 320 is provided corresponding to the main shaft 100 and extends into the third arcuate groove 105. As the third arcuate sliding portion 321 slides within the third arcuate groove 105, the connecting plate 210 can rotate about the main shaft 100. The first slide plate portion 322 of the auxiliary swing arm 320 is provided corresponding to the connecting plate 210 and extends into the first slide groove 212. The first slide plate portion 322 slides along the first slide groove 212, enabling the connecting plate 210 to translate away from or toward the main shaft 100.

[0155] As shown in Figure 12, when the rotating shaft mechanism 10c is in the expanded state, the third arc-shaped sliding portion 321 of the auxiliary swing arm 320 extends the most into the third arc-shaped groove 105 of the main shaft 100, and the first slide portion 322 of the auxiliary swing arm 320 extends the least into the first slide groove 212 on the connecting plate 210. The connecting plates 210 on both sides of the main shaft 100 are in a state of moving away from each other to provide sufficient spacing between the connecting plates 210 on both sides so that the bendable portion 23 of the folding screen 20 remains in a flat state. As shown in Figure 13, when the rotating shaft mechanism 10c is in the folded state, the third arc-shaped sliding portion 321 of the auxiliary swing arm 320 extends the least into the third arc-shaped groove 105 of the main shaft 100, and the first slide portion 322 of the auxiliary swing arm 320 extends the most into the first slide groove 212 on the connecting plate 210. The connecting plates 210 on both sides of the main shaft 100 are in a state of being close to each other, so as to provide bending space for the bendable portion 23 of the folding screen 20, so that the bendable portion 23 maintains a bent state.

[0156] On the basis that the auxiliary swing arm 320 can cooperate with the main swing arm 310 to jointly realize the rotation and translation of the connecting plate 210 relative to the main shaft 100, in other embodiments, one end of the auxiliary swing arm 320 can be rotatably connected to the main shaft 100, and the other end of the auxiliary swing arm 320 can be slidingly connected to the connecting plate 210, or one end of the auxiliary swing arm 320 can be slidably connected to the main shaft 100, and the other end of the auxiliary swing arm 320 can be rotatably connected to the connecting plate 210, or one end of the auxiliary swing arm 320 can be slidably and rotatably connected to the main shaft 100, and the other end of the auxiliary swing arm 320 can be rotatably connected to the connecting plate 210, or, similar to the main swing arm 310, one end of the auxiliary swing arm 320 can be slidably and rotatably connected to the main shaft 100, and the other end of the auxiliary swing arm 320 can be slidably and rotatably connected to the connecting plate 210, etc. This embodiment does not impose specific restrictions on this.

[0157] In addition to the main swing arm 310 and the auxiliary swing arm 320, in this embodiment, the motion assembly 300 may further include an auxiliary swing arm 330 (see FIG7 ). One end of the auxiliary swing arm 330 is movably connected to the main shaft, and the other end of the auxiliary swing arm 330 is connected to the connecting plate. The auxiliary swing arm 330 also functions to transmit power between the main shaft 100 and the connecting plate 210, thereby making the connection between the connecting plate 210 and the main shaft 100 more reliable and the movement of the connecting plate 210 relative to the main shaft 100 more stable and smooth.

[0158] The auxiliary swing arm 330 can be positioned on the central axis 102 of the rotating shaft mechanism 10c. The auxiliary swing arm 330 is spaced relatively far from the main swing arm 310 and the auxiliary swing arm 320 located at either end of the rotating shaft mechanism 10c. The auxiliary swing arm 330 can guide the motion of the central axis 102 of the rotating shaft mechanism 10c and constrain its trajectory. Thus, the auxiliary swing arm 330, in conjunction with the main swing arm 310 and the auxiliary swing arm 320, guides the motion of various regions along the length of the rotating shaft mechanism 10c and constrains its trajectory, resulting in improved balance and precision in the movement of the rotating shaft mechanism 10c.

[0159] Furthermore, the central axis portion 102 of the rotating shaft mechanism 10c has a relatively large space, which is convenient for the installation of the auxiliary swing arm 330. The addition of the auxiliary swing arm 330 to the central axis portion of the rotating shaft mechanism 10c makes the layout of the rotating shaft mechanism 10c more compact, improves the space utilization of the rotating shaft mechanism 10c, and makes the components of the rotating shaft mechanism 10c more balanced.

[0160] The auxiliary swing arm 330 can be arranged between the first damping module 510 and the second damping module 520. The auxiliary swing arm 330 separates the first damping module 510 and the second damping module 520. Since the auxiliary swing arm 330 is movably connected between the main shaft 100 and the connecting plate 210, it can provide a certain amount of assistance between the first damping module 510 and the second damping module 520, which can reduce the damping effect of the first damping module 510 and the second damping module 520, and ensure the smooth movement of the rotating shaft mechanism 10c.

[0161] For example, the auxiliary swing arms 330 can be disposed on either side of the central axis, with the auxiliary swing arms 330 on either side being closer to the upper and lower axis portions, respectively. This allows for greater spacing between the auxiliary swing arms 330 and the corresponding main swing arms 310 and auxiliary swing arms 320, as well as greater spacing between the auxiliary swing arms 330 on either side. The auxiliary swing arms 330 are generally evenly spaced between the main swing arms 310 and auxiliary swing arms 320 at either end of the rotating shaft mechanism 10c, resulting in a more balanced and smoother movement of the rotating shaft mechanism 10c.

[0162] As for the structural design of the auxiliary swing arm 330, as an example, one end of the auxiliary swing arm 330 can be slidably and rotatably connected to the main shaft 100, and the other end of the auxiliary swing arm 330 can be slidably and rotatably connected to the connecting plate 210. The two ends of the auxiliary swing arm 330 can rotate around the main shaft 100 and the connecting plate 210 respectively, enabling the connecting plate 210 to rotate relative to the main shaft 100; the two ends of the auxiliary swing arm 330 can also slide relative to the main shaft 100 and the connecting plate 210 respectively, enabling the connecting plate 210 to move away from or closer to the main shaft 100, changing the size of the gap between the connecting plate 210 and the main shaft 100, and providing the deformation space required for the bendable portion 23 of the folding screen 20 to switch between the flattened state and the bent state.

[0163] For example, the auxiliary swing arm 330 can have a similar structure to the main swing arm 310. The auxiliary swing arm 330 can better constrain the trajectory of the central axis section of the rotating shaft mechanism 10c, and the auxiliary swing arm 330 has a large degree of freedom. The adapter plate 220 can also be connected to the auxiliary swing arm 330. In this way, there are more connection points between the adapter plate 220 and the motion assembly 300, and the adapter plate 220 has better stability and reliability. The details will not be repeated here.

[0164] The synchronizing structure 400 and the damping mechanism 500 connected between the main shaft 100 and the connecting assembly 200 are described in detail below.

[0165] Figure 14 is a partial enlarged view of point B in Figure 4 . Referring to Figure 14 , the figure shows a synchronization structure 400 connected between the main shaft 100 and the connecting plates 210 on both sides. The synchronization structure 400 is used to synchronize the movement of the connecting plates 210 on both sides relative to the main shaft 100, so that the connecting plates 210 on both sides drive the first shell 10a and the second shell 10b to move synchronously, ensuring the precise movement of the shell assembly 10, thereby ensuring that the foldable electronic device 1 can smoothly and accurately switch between the unfolded state and the folded state.

[0166] In which, the synchronization structure 400 can include two synchronization swing arms 410, the first ends of the two synchronization swing arms 410 are both rotatably connected to the main shaft 100, and the first ends of the two synchronization swing arms 410 are respectively located on both sides of the width direction of the main shaft 100. For example, the first ends of the two synchronization swing arms 410 can be arranged side by side along the width direction of the main shaft 100; the second ends of the two synchronization swing arms 410 respectively extend to the connecting plates 210 on both sides of the main shaft 100, and the connecting plates 210 can be provided with second sliding grooves 213, for example, the second sliding grooves 213 on the connecting plates 210 on both sides of the main shaft 100 are relatively arranged, and the second ends of the two synchronization swing arms 410 slide along the corresponding second sliding grooves 213 respectively.

[0167] During the conversion of the rotating shaft mechanism 10c between the unfolded state and the folded state, the first ends of the two synchronous swing arms 410 rotate synchronously and in opposite directions, so that the second ends of the two synchronous swing arms 410 rotate synchronously and in opposite directions. The second ends of the two synchronous swing arms 410 slide along the second sliding grooves 213 on the connecting plates 210 on both sides to guide the connecting plates 210 on both sides, so that the connecting plates 210 on both sides drive the first shell 10a and the second shell 10b to move synchronously.

[0168] As shown in FIG14 , as an embodiment, the synchronization structure 400 can be a gear transmission structure. The first ends of the two synchronization swing arms 410 can be provided with synchronization gears 411. The synchronization gears 411 of the two synchronization swing arms 410 are both mounted on the main shaft 100 via rotating shafts (see FIG17 , the rotating shafts can be inserted into corresponding mounting holes 107 on the main shaft 100), and the two synchronization gears 411 are meshed with each other. The two synchronization gears 411 are of the same size and have the same number of teeth and equal tooth spacing. The two synchronization gears 411 transmit power to each other, achieving synchronous and counter-rotating rotation of the two synchronization gears 411, which drives the second ends of the synchronization swing arms 410 to rotate synchronously and counter-rotatingly.

[0169] Of course, in addition to gear transmission, the synchronization structure 400 may also adopt other transmission methods. For example, a synchronization transmission member may be provided between the first ends of the two synchronization swing arms 410. Through the transmission action of the synchronization transmission member, the first ends of the two synchronization swing arms 410 can rotate synchronously and in opposite directions. For example, a guide column may be provided on the synchronization transmission member, and the first ends of the synchronization swing arms 410 may be a cylindrical (columnar) structure with a spiral hole (spiral groove). The guide column slides along the spiral hole (spiral groove), driving the first ends of the two synchronization swing arms 410 to rotate synchronously and in opposite directions.

[0170] Figure 15 is a partial enlarged view of point C in Figure 4 . As shown in Figure 15 , the first damping module 510 located at the upper and lower shaft portions of the hinge mechanism 10c can include two support shafts 511 and a damping structure. The support shafts 511 can be axially arranged along the length of the main shaft 100, with the two support shafts 511 spaced apart along the width of the main shaft 100. For example, the two support shafts 511 can be arranged side by side along the width of the main shaft 100, and the support shafts 511 are inserted into corresponding mounting holes 107 (see Figure 17 ) on the main shaft 100. The damping structure is mounted on the two support shafts 511. As the hinge mechanism 10c transitions between the unfolded and folded states, the damping structure generates a varying damping force, providing the damping force required for the foldable electronic device 1 to transition between the unfolded and folded states, and between the two states.

[0171] As an embodiment, the damping structure may include two driving members 512 and an elastic component 513. The two driving members 512 are respectively mounted on the two support shafts 511 and can rotate synchronously and in opposite directions about the corresponding support shafts 511. The elastic component 513 is mounted on the two support shafts 511 and abuts against the two driving members 512. As the rotating shaft mechanism 10c moves, or in other words, as the rotating shaft mechanism 10c switches between the unfolded state and the folded state, the two driving members 512 rotate synchronously and in opposite directions about the corresponding support shafts 511. During the rotation process, the two driving members 512 squeeze the elastic component 513, changing the compression amount of the elastic component 513, so that the elastic component 513 generates a variable damping force.

[0172] As shown in FIG15 , the driving member 512 may include a rotating sleeve 5121 and a rotating plate 5122. The rotating sleeve 5121 is connected to one end of the rotating plate 5122. The rotating sleeve 5121 may, for example, be integrally formed at the end of the rotating plate 5122. The rotating sleeve 5121 is sleeved on the corresponding support shaft 511. The rotating plate 5122 may extend toward the corresponding connecting plate 210 and be slidably connected to the connecting plate 210. For example, the connecting plate 210 may be provided with a third sliding groove 214. During the process of rotation and translation of the connecting plate 210 relative to the main shaft 100, the rotating plate 5122 slides along the third sliding groove 214 to drive the rotating sleeve 5121 to rotate about the support shaft 511.

[0173] It should be noted that, in this embodiment, the sliding connection between the driving member 512 and the connecting plate 210 is used as an example. The connecting plate 210 moves relative to the main shaft 100, thereby driving the driving member 512 to move, thereby achieving the rotation of the rotating sleeve 5121 of the driving member 512 around the support shaft 511. In other examples, the rotating sleeve 5121 may be provided only on the support shaft 511, and the rotating sleeve 5121 may cooperate with other structures on the main shaft 100 to achieve the rotation of the rotating sleeve 5121. In other words, the driving member 512 may also include only the rotating sleeve 5121, without including the rotating plate 5122 that is slidably connected to the connecting plate 210. For example, the rotating sleeve 5121 may be connected to the synchronization structure 400, or the rotating sleeve 5121 may be integrally formed on the synchronization structure 400, and the rotating sleeve 5121 may be driven to rotate synchronously during the rotation of the synchronization structure 400.

[0174] Continuing with FIG15 , the elastic assembly 513 includes a limiting sleeve 5131 and two elastic members 5132. The two elastic members 5132 are respectively mounted on the two support shafts 511. The elastic members 5132 are, for example, springs. The limiting sleeve 5131 is also mounted on the two support shafts 511. The two support shafts 511 can pass through the limiting sleeve 5131 at the same time. The limiting sleeve 5131 is connected to one end of the elastic member 5132 facing the rotating sleeve 5121. During the rotation of the rotating sleeve 5121, it abuts against different parts of the limiting sleeve 5131, driving the limiting sleeve 5131 to move along the support shafts 511. The limiting sleeve 5131 squeezes the elastic member 5132, changing the compression amount of the elastic member 5132. The elastic member 5132 is elastically deformed to provide a damping force.

[0175] The elastic assembly 513 shown in the figure includes two stop sleeves 5131, each connected to the ends of an elastic member 5132. Accordingly, the driving member 512 may include two rotating sleeves 5121, one located at each end of the elastic assembly 513. The two rotating sleeves 5121 abut against the corresponding stop sleeve 5131. The rotating sleeves 5121 on either side simultaneously push against the corresponding stop sleeve 5131, squeezing the ends of the elastic member 5132 and changing the compression of the elastic member 5132. In this case, the maximum compression of the elastic member 5132 is relatively large, and the damping force provided by the elastic member 5132 is relatively large. The driving member 512 may be provided with a connecting plate 5123, to which both rotating sleeves 5121 are connected. The two rotating sleeves 5121 may be integrally formed at the ends of the connecting plate 5123, for example, to achieve synchronous rotation of the two rotating sleeves 5121.

[0176] In other examples, the elastic component 513 may include only a limiting sleeve 5131, and accordingly, the driving member 512 may include only a rotating sleeve 5121. The limiting sleeve 5131 is connected to one end of the elastic member 5132 facing the rotating sleeve 5121, and the other end of the elastic member 5132 may be fixed to the main shaft 100. The rotating sleeve 5121 of the driving member 512 pushes against the limiting sleeve 5131, squeezing one end of the elastic member 5132 and changing the compression amount of the elastic member 5132. In this case, the maximum compression amount of the elastic member 5132 is relatively small, and the damping force provided by the elastic member 5132 is relatively small.

[0177] As for driving the limiting sleeve 5131 to move along the support shaft 511 by rotating the rotating sleeve 5121 of the driving member 512, as shown in FIG15 , in some embodiments, the end of the rotating sleeve 5121 facing the limiting sleeve 5131 may have a protrusion 51211, and the end of the limiting sleeve 5131 facing the rotating sleeve 5121 may have a recess 51311. The protrusion 51211 and the recess 51311 cooperate with each other, and the width of the recess 51311 may be slightly larger than the width of the protrusion 51211. During the rotation of the rotating sleeve 5121, the protrusion 51211 moves accordingly and abuts different parts of the limiting sleeve 5131. The protrusion 51211 moves along the end surface of the limiting sleeve 5131 and slides into or out of the recess 513117, thereby pushing the limiting sleeve 5131 to move, squeezing the elastic member 5132 to change its compression amount, causing the elastic member 5132 to provide a variable damping force.

[0178] Of course, a recess 51311 can be provided at one end of the rotating sleeve 5121 facing the limiting sleeve 5131, and a convex portion 51211 can be provided at one end of the limiting sleeve 5131 facing the rotating sleeve 5121. During the rotation of the rotating sleeve 5121, the recess 51311 moves to the corresponding convex portion 51211 of the limiting sleeve 5131 and extends into the convex portion 51211, or the recess 51311 moves to correspond to other parts of the limiting sleeve 5131 to push the limiting sleeve 5131 to move, and the limiting sleeve 5131 squeezes the elastic member 5132 to change its compression amount, which will not be repeated.

[0179] Taking the example of the convex portion 51211 provided on the rotating sleeve 5121 of the driving member 512 and the concave portion 51311 provided on the limiting sleeve 5131 of the elastic component 513, when the hinge mechanism 10c is in the folded state, the convex portion 51211 of the rotating sleeve 5121 can abut against areas other than the concave portion 51311 of the limiting sleeve 5131, resulting in maximum compression of the elastic member 5132 and a high damping force of the hinge mechanism 10c. As the hinge mechanism 10c gradually transitions to the unfolded state, the convex portion 51211 on the rotating sleeve 5121 gradually moves into the concave portion 51311 of the limiting sleeve 5131, gradually reducing the compression of the elastic member 5132 and releasing the damping force, thereby facilitating rapid unfolding of the hinge mechanism 10c. When the rotating shaft mechanism 10c is unfolded to the flattened state, the bottom end of the rotating sleeve 5121 that has not yet completely abutted against the recess 51311 of the limiting sleeve 5131 still has space for releasing the damping force, and the rotating shaft mechanism 10c has a tendency to continue to unfold.

[0180] Figure 16 is a partial enlarged view of point D in Figure 4. As shown in Figure 16 , the second damping module 520a includes a damping swing arm 521 and a damping assembly 522. The damping swing arm 521 is connected between the main shaft 100 and the connecting plate 210. Typically, the end of the damping swing arm 521 facing the main shaft 100 is rotationally connected to the main shaft 100. The end of the damping swing arm 521 facing the connecting plate 210 slides along the connecting plate 210. The damping assembly 522 is located in the area where the connecting plate 210 is located, and the damping assembly 522 abuts the damping swing arm 521. As the damping swing arm 521 slides along the connecting plate 210, the damping swing arm 521 squeezes the damping assembly 522, causing the damping assembly 522 to generate a damping force in the area where the connecting plate 210 is located, providing another portion of the damping force required by the rotating shaft mechanism 10c.

[0181] It is understood that, for a second damping module 520, a second damping module 520 includes two second damping modules 520a. The first ends of the damping swing arms 521 of the two second damping modules 520a are both rotatably connected to the main shaft 100. The second ends of the damping swing arms 521 of the two second damping modules 520a slide along the connecting plates 210 on both sides of the main shaft 100. The damping components 522 of the two second damping modules 520a are respectively located on the connecting plates 210 on both sides of the main shaft 100, and the two damping components 522 respectively abut against the damping swing arms 521 on the corresponding sides. During the movement of the rotating shaft mechanism 10c, the damping swing arms 521 on both sides of the main shaft 100 rotate synchronously and in opposite directions, driving the damping components 522 on both sides of the main shaft 100 to deform synchronously, thereby providing the same damping force on both sides of the main shaft 100 and ensuring force balance of the rotating shaft mechanism 10c.

[0182] As for the connection between the damping swing arm 521 and the main shaft 100 and the connecting plate 210, for example, a fourth arcuate groove 106 (see FIG17 ) may be provided on the main shaft 100, and a fourth slide groove 215 may be provided on the connecting plate 210. The damping swing arm 521 may include a fourth arcuate sliding portion 5211 and a second slide portion 5212. The fourth arcuate sliding portion 5211 and the second slide portion 5212 may be an integrally formed structure. The fourth arcuate sliding portion 5211 of the damping swing arm 521 extends into the fourth arcuate groove 106 of the main shaft 100 and slides along the fourth arcuate groove 106 to enable the damping swing arm 521 to rotate around the main shaft 100. The second slide portion 5212 of the damping swing arm 521 is located in the fourth slide groove 215 on the connecting plate 210, and the second slide portion 5212 slides along the fourth slide groove 215.

[0183] The damping assembly 522 located in the area where the connecting plate 210 is located can abut against the second slide portion 5212 of the damping swing arm 521. As the connecting plate 210 rotates relative to the main shaft 100, the second slide portion 5212 of the damping swing arm 521 slides along the fourth slide groove 215 of the connecting plate 210, and the damping swing arm 521 squeezes the damping assembly 522 and can change the compression amount of the damping assembly 522. The damping assembly 522 produces elastic deformation to provide damping force for the rotating shaft.

[0184] Continuing with reference to Figure 16, as an embodiment, a mounting groove 52121 may be provided on the second slide portion 5212 of the damping swing arm 521, and an avoidance opening (not shown in the figure) may be provided on the end of the second slide portion 5212 facing the main shaft 100, and the damping component 522 is clamped in the mounting groove 52121, and the side of the damping component 522 facing away from the main shaft 100 is abutted against the inner side wall of the mounting groove 52121, and the side of the damping component 522 facing the main shaft 100 can pass through the avoidance opening of the damping swing arm 521 and abut against the side wall of the main shaft 100. As the connecting plate 210 moves relative to the main shaft 100, the damping swing arm 521 rotates around the main shaft 100, and the damping component 522 is pressed against one end of the main shaft 100 and slides along the side wall of the main shaft 100. The side wall of the main shaft 100 squeezes the damping component 522, causing the damping component 522 to produce elastic deformation in the width direction of the main shaft 100, thereby changing the damping force provided by the damping component 522.

[0185] The damping assembly 522 may include a bracket assembly 5221 and an elastic member 5222. The bracket assembly 5221 is positioned adjacent to the spindle 100. One end of the bracket assembly 5221, which faces the spindle 100, passes through the avoidance opening of the damping swing arm 521 and abuts against the sidewall of the spindle 100. The elastic member 5222 may extend along the width of the spindle 100. One end of the elastic member 5222 abuts the bracket assembly 5221, and the other end abuts against the inner sidewall of the mounting groove 52121 facing away from the spindle 100. As the damping swing arm 521 rotates about the spindle 100, the bracket assembly 5221 slides along the sidewall of the spindle 100. The two ends of the elastic member 5222 are squeezed by the bracket assembly 5221 and the inner sidewall of the mounting groove 52121, causing the elastic member 5222 to elastically deform.

[0186] For example, depending on the damping force required by the rotating shaft mechanism 10c, the damping assembly 522 may include only one elastic member 5222, or the damping assembly 522 may include more than two elastic members 5222, each elastic member 5222 being arranged at intervals along the width direction of the connecting plate 210, for example.

[0187] The bracket assembly 5221 may include a bracket body 52211 and a roller 52212. The bracket body 52211 is provided with a fixed shaft on the side facing the main shaft 100. The fixed shaft extends, for example, along the length of the main shaft 100. The roller 52212 is sleeved on the fixed shaft and can rotate about the fixed shaft. The outer wall of the roller 52212 abuts against the side wall of the main shaft 100. The elastic member 5222 may be abutted between the bracket body 52211 and the inner side wall of the mounting groove 52121 facing away from the main shaft 100. In this way, when the bracket assembly 5221 slides along the side wall of the main shaft 100, the roller 52212 can roll on the side wall of the main shaft 100, thereby reducing the friction between the bracket assembly 5221 and the main shaft 100 and making the movement of the connecting plate 210 smoother.

[0188] In other embodiments, the damping assembly 522 may be mounted on the connecting plate 210, with the position of the damping assembly 522 relative to the connecting plate 210 being fixed. For example, the damping assembly 522 may be mounted on one side of the second slide portion 5212 of the damping swing arm 521, with the damping assembly 522 abutting the sidewall of the corresponding side of the second slide portion 5212. Alternatively, the damping assembly 522 may be mounted on both sides of the second slide portion 5212 of the damping swing arm 521, with the damping assemblies 522 on both sides abutting the sidewalls of the second slide portion 5212. As the second slide portion 5212 of the damping swing arm 521 slides along the fourth slot 215 of the connecting plate 210, different portions of the second slide portion 5212 squeeze the damping assembly 522, thereby varying the amount of compression of the damping assembly 522 and causing the damping assembly 522 to elastically deform along the length of the connecting plate 210.

[0189] The main shaft 100 of the rotating shaft mechanism 10 c will be described in detail below.

[0190] Figure 17 is a schematic structural diagram of the spindle of the rotating shaft mechanism in Figure 4 ; Figure 18 is an exploded structural diagram of the spindle in Figure 17 . As shown in Figures 17 and 18 , to facilitate the installation of the aforementioned motion assembly 300, synchronization mechanism 400, damping mechanism 500, and other components on the spindle 100, in this embodiment, the spindle 100 can be composed of a support beam 110 and a cover plate 120. The support beam 110 is the main supporting structure of the spindle 100 and can extend along the length of the spindle 100 to both ends of the spindle 100. In other words, the support beam 110 provides the required length for the spindle 100. There can be multiple cover plates 120, and each cover plate 120 is arranged in sequence along the length direction of the support beam 110. The cover plate 120 is connected to the side surface of the support beam 110 in the thickness direction. The support beam 110 and the cover plate 120 together form grooves, holes and other structures as the installation basis for components such as the motion component 300, the synchronization structure 400 and the damping mechanism 500, so as to accommodate and position these components.

[0191] Since the spindle 100 is very thin and many components, such as the motion assembly 300, the synchronization mechanism 400, and the damping mechanism 500, need to be mounted on the spindle 100, structures such as slots and holes need to be machined on the spindle 100 to accommodate and position these components. These slots and holes need to pass through the middle region of the spindle 100 in the thickness direction. By providing the cover plate 120 and the support beam 110 to form the spindle 100 together, portions of the slots and holes can be machined on the cover plate 120 and the support beam 110, respectively. After the cover plate 120 and the support beam 110 are assembled, they together enclose a complete structure such as the slots and holes. This facilitates the machining of the slots and holes, as well as the assembly of components such as the motion assembly 300, the synchronization mechanism 400, and the damping mechanism 500 on the spindle 100.

[0192] For example, the first arc groove 104 on the aforementioned main shaft 100 for accommodating the main swing arm 310, the third arc groove 105 for accommodating the auxiliary swing arm 320, the fourth arc groove 106 for accommodating the damping swing arm 521 of the second damping module 520a, and the mounting hole 107 on the main shaft 100 for installing the rotating shaft of the synchronous swing arm 410, and the mounting hole 107 on the main shaft 100 for installing the support shaft 511 of the first damping module 510 can all be surrounded by the cover plate 120 and the support beam 110.

[0193] When installing components such as the motion assembly 300, the synchronization structure 400, and the damping mechanism 500 on the main spindle 100, these components can be pre-positioned on the support beam 110. After the cover plate 120 is snapped onto the support beam 110 and accurately positioned, the cover plate 120 is fixedly connected to the support beam 110. The grooves, holes, and other structures formed by the cover plate 120 and the support beam 110 are used to position these components and guide their movement. For example, the cover plate 120 and the support beam 110 can be connected by screws. After the cover plate 120 is positioned on the support beam 110, the screws are tightened to securely lock the cover plate 120 on the support beam 110, thereby ensuring the stability and reliability of the components installed on the main spindle 100.

[0194] For ease of explanation, this embodiment defines the two side surfaces of the support beam 110 in the thickness direction as the first surface and the second surface respectively. The first surface of the support beam 110 is its front side. The bendable portion 23 of the folding screen 20 can be supported on the first surface of the support beam 110. The cover plate 120 can be connected to the second surface of the support beam 110 to avoid affecting the flatness of the front side of the support beam 110, ensuring that the front side of the support beam 110 supports the folding screen 20 stably. In addition, the motion component 300, synchronization structure 400, damping mechanism 500 and other components jointly positioned by the cover plate 120 and the support beam 110 are close to the back side of the main shaft 100, which is conducive to the installation and movement of these components.

[0195] This embodiment does not specifically limit the position of each cover plate 120 along the length of the support beam 110. Some of the cover plates 120 can be positioned on the support beam 110 in areas where the motion assembly 300 is required. These cover plates 120 and the support beam 110 can collectively form grooves for accommodating the motion assembly 300, which can guide the movement of the motion assembly 300. Some of the cover plates 120 can be positioned corresponding to components such as the synchronization structure 400 and the damping mechanism 500. These cover plates 120 and the support beam 110 can collectively form holes for supporting and positioning these components. Furthermore, the space between adjacent cover plates 120 can be used to position these components.

[0196] Among them, end covers 108 can be provided at both ends of the support beam 110 in the length direction. The end covers 108 can be used to limit the folding screen 20 to ensure the position accuracy of the assembly of the folding screen 20 and the hinge mechanism 10c. Similarly, the end covers 108 can also limit the first shell 10a and the second shell 10b to ensure the assembly accuracy of the shell assembly 10.

[0197] In addition, when the support beam 110 is long, the support beam 110 can be divided into two or more sections along its length, and then the sections of the support beam 110 are sequentially connected to assemble to form a complete support beam 110. For example, as shown in FIG18 , the support beam 110 can be divided into three sections: an upper beam 111, a middle beam 112, and a lower beam 113103. The upper beam 111, the middle beam 112, and the lower beam 113103 are sequentially connected (e.g., welded) to form a complete support beam 110. End caps 108 are provided at the ends of the upper beam 111 and the lower beam 113103 that are away from each other.

[0198] For example, support beam 110 can be made of plastic or metal, as long as it meets the overall structural strength requirements of main shaft 100. When hinge mechanism 10c is used in an inward-folding electronic device, support beam 110 may be exposed when folded. In this case, support beam 110 can be made of metal to enhance the appearance of foldable electronic device 1.

[0199] The cover plate 120 can be made of metal. Thus, when the support beam 110 is made of metal, the cover plate 120 and the support beam 110 can be made of the same metal material to improve the consistency of the main shaft 100 and enhance the structural strength and reliability of the main shaft 100. Of course, the cover plate 120 can also be made of plastic to reduce the overall weight of the main shaft 100, facilitating a lightweight and thin design of the foldable electronic device 1 and also helping to reduce the manufacturing cost of the foldable electronic device 1.

[0200] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0201] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

Claims

1. A hinge mechanism, applied to a foldable electronic device, characterized in that: The rotating shaft mechanism comprises an upper shaft portion, a middle shaft portion and a lower shaft portion which are sequentially arranged along the length direction, wherein the upper shaft portion and the lower shaft portion are symmetrically arranged, and the rotating shaft mechanism comprises: Spindle; Connecting plates, located on both sides of the main shaft in the width direction; and a motion component, a synchronization structure, a first damping module and at least one second damping module movably connected between the main shaft and the connecting plate, wherein the first damping module generates a damping force in the area where the main shaft is located, and the second damping module generates a damping force in the area where the connecting plate is located; Among them, in the upper shaft portion and the lower shaft portion, from the end of the rotating shaft mechanism to the center of the rotating shaft mechanism, the motion component, the synchronization structure and the first damping module are arranged in sequence; the at least one second damping module is arranged in the middle shaft portion, and each second damping module includes two second damping modules, and the two second damping modules are respectively connected to the connecting plates on both sides of the main shaft.

2. The rotating shaft mechanism according to claim 1, characterized in that: The motion assembly comprises a main swing arm and a secondary swing arm located at the upper shaft portion and the lower shaft portion, wherein the main swing arm is disposed adjacent to the secondary swing arm; One end of the main swing arm is connected to the main shaft in a sliding and rotatable manner, and the other end of the main swing arm is connected to the connecting plate on the corresponding side in a sliding and rotatable manner; One end of the auxiliary swing arm is slidably and rotatably connected to the main shaft, and the other end of the auxiliary swing arm is slidably connected to the connecting plate on the corresponding side.

3. The rotating shaft mechanism according to claim 2, characterized in that: The auxiliary swing arm is located at one side of the end of the main swing arm away from the rotating shaft mechanism.

4. The rotating shaft mechanism according to claim 2, characterized in that: The motion assembly also includes an auxiliary swing arm located at the central axis, one end of the auxiliary swing arm is movably connected to the main shaft, and the other end of the auxiliary swing arm is connected to the connecting plate.

5. The rotating shaft mechanism according to claim 4, characterized in that: One end of the auxiliary swing arm is connected to the main shaft in a sliding and rotatable manner, and the other end of the auxiliary swing arm is connected to the connecting plate in a sliding and rotatable manner.

6. The rotating shaft mechanism according to claim 4, characterized in that: The auxiliary swing arm is arranged between the first damping module and the second damping module.

7. The rotating shaft mechanism according to any one of claims 1 to 6, characterized in that: The connecting plates on both sides of the main shaft are provided with threading grooves, the threading grooves on the connecting plates on both sides are arranged opposite to each other, and the threading grooves are located at the middle shaft part.

8. The rotating shaft mechanism according to claim 7, characterized in that: The number of the second damping modules is one, and two of the second damping modules are arranged on the same side of the threading groove, or two of the second damping modules are arranged on both sides of the threading groove respectively.

9. The rotating shaft mechanism according to any one of claims 1 to 6, characterized in that: The synchronization structure includes: Two synchronous swing arms; the first ends of the two synchronous swing arms are respectively rotatably connected to the two sides of the width direction of the main shaft, and rotate synchronously and in opposite directions; the second ends of the two synchronous swing arms are respectively slidably connected to the connecting plates on both sides of the main shaft.

10. The rotating shaft mechanism according to claim 9, characterized in that: The first ends of the two synchronous swing arms are each provided with a synchronous gear, and the two synchronous gears are meshed with each other.

11. The rotating shaft mechanism according to any one of claims 1 to 6, characterized in that: The first damping module comprises: Two support shafts, the two support shafts are arranged at intervals along the width direction of the main shaft; The damping structure is sleeved on the two support shafts and generates a damping force in the area where the main shaft is located.

12. The rotating shaft mechanism according to claim 11, characterized in that: The damping structure comprises: Two driving members; the two driving members are respectively sleeved on the two supporting shafts and rotate synchronously and in opposite directions; The elastic component is sleeved on the two supporting shafts and abuts against the two driving members. The driving members rotate and squeeze the elastic component to drive the elastic component to deform.

13. The rotating shaft mechanism according to any one of claims 1 to 6, characterized in that: The second damping module comprises: A damping swing arm, one end of which is rotatably connected to the main shaft, and the other end of which is slidably connected to the connecting plates on both sides of the main shaft; A damping component is arranged corresponding to the connecting plate on the corresponding side and abuts against the damping swing arm; the damping component is squeezed and deformed by the damping swing arm to generate a damping force in the area where the connecting plate is located.

14. The rotating shaft mechanism according to claim 13, characterized in that: The damping swing arm is provided with a mounting groove, and one end of the damping swing arm facing the main shaft has an avoidance opening, and the avoidance opening is communicated with the mounting groove; The damping assembly is clamped in the mounting groove, and the damping assembly passes through the avoidance opening toward one side of the main shaft and abuts against the side wall of the main shaft; as the connecting plate moves relative to the main shaft, the damping assembly slides along the side wall of the main shaft and generates elastic deformation in the width direction of the main shaft.

15. The rotating shaft mechanism according to claim 14, characterized in that: The damping assembly includes a bracket assembly and at least one elastic member; The bracket assembly abuts against the side wall of the main shaft and slides along the side wall of the main shaft; one end of the elastic member abuts against the bracket assembly, and the other end of the elastic member abuts against the inner side wall of the mounting groove away from the main shaft.

16. The rotating shaft mechanism according to any one of claims 1 to 6, characterized in that: The rotating shaft mechanism also includes: An adapter plate is located between the connecting plate and the main shaft and is connected to the motion component.

17. The rotating shaft mechanism according to any one of claims 1 to 6, characterized in that: When the foldable electronic device is in a folded state, the folding screen is arranged outside the connecting plates on both sides of the main axis.

18. A foldable electronic device, characterized in that: It comprises a first shell, a second shell, a folding screen and a hinge mechanism according to any one of claims 1 to 17; The connecting plates on both sides of the hinge mechanism are respectively connected to the first shell and the second shell, the folding screen is mounted on the first shell and the second shell, and the folding screen is supported by the hinge mechanism.

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