Rotating shaft mechanism and electronic equipment

Abstract

The invention discloses a rotating shaft mechanism and electronic equipment. The rotating shaft mechanism (1) comprises a main shaft (101), a synchronous assembly (102), a first shell fixing frame (103) and a second shell fixing frame (104), the first shell fixing frame (103) and the second shell fixing frame (104) are located on the two opposite sides of the main shaft (101), and the synchronous assembly (102) is located between the first shell fixing frame (103) and the second shell fixing frame (104). The synchronous assembly (102) comprises a first connecting rod (1021), a second connecting rod (1022) and a third connecting rod (1023), the first connecting rod (1021) and the third connecting rod (1023) are rotationally connected through the second connecting rod (1022), the first connecting rod (1021) is rotationally connected with the main shaft (101), and the rotationally connected axes of all the rotationally connected positions are parallel and do not coincide. And the third connecting rod (1023) is in sliding connection with the second shell fixing frame (104). The first shell fixing frame (103) is provided with a first track groove (10311), and the first connecting rod (1021) slides along the first track groove (10311) so that the first shell fixing frame (103) and the second shell fixing frame (104) can synchronously rotate oppositely or reversely relative to the main shaft (101). In the folding process of the electronic equipment applying the rotating shaft mechanism, the stress of the flexible display screen is relatively uniform, so that the structural reliability of the flexible display screen is favorably improved.

Description

Rotating shaft mechanism and electronic equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on April 27, 2023, with application number 202310481738.3 and application name "A rotating shaft mechanism and electronic device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of electronic equipment, and in particular to a rotating shaft mechanism and electronic equipment. Background Art

[0004] As flexible display technology matures, the display mode of electronic devices has undergone tremendous changes. Foldable flexible display mobile phones, foldable flexible display tablets, and wearable electronic devices with foldable flexible displays are an important evolutionary direction for future smart electronic devices.

[0005] Flexible displays are key components in foldable electronic devices, featuring continuous foldability. The hinge mechanism, a crucial component for achieving the folding function, can flatten or bend the flexible display during the unfolding and closing process. Currently, with rising economic levels, users have higher expectations for foldable electronic devices, and the structural reliability of flexible displays is a key factor affecting user experience. Therefore, improving the structural reliability of flexible displays has become a topic of extensive research by those skilled in the art.

[0006] Summary of the Invention

[0007] The present application provides a hinge mechanism and an electronic device to improve the structural reliability of a flexible display screen of the electronic device, thereby improving the structural reliability of the electronic device.

[0008] In a first aspect, the present application provides a hinge mechanism that can be used in a foldable electronic device. The hinge mechanism is disposed corresponding to a bendable portion of a flexible display screen of the electronic device, and the electronic device is unfolded or closed by the hinge mechanism. Specifically, the hinge mechanism may include a main shaft, a synchronization assembly, a first housing mount, and a second housing mount. The first housing mount and the second housing mount are disposed on opposite sides of the main shaft, and the synchronization assembly is located between the first housing mount and the second housing mount. The synchronization assembly includes a first connecting rod, a second connecting rod, and a third connecting rod. The second connecting rod is rotationally connected to the first connecting rod, and the second connecting rod is rotationally connected to the third connecting rod. The axis of rotation between the second connecting rod and the first connecting rod is parallel and non-coincident. Furthermore, the first connecting rod is rotationally connected to the main shaft, and the axis of rotation between the first connecting rod and the main shaft and the axis of rotation between the second connecting rod and the first connecting rod are parallel and non-coincident. The third connecting rod is rotationally connected to the main shaft, and the third connecting rod is slidably connected to the second housing mount. The first housing mounting frame is provided with a first track groove, and the first connecting rod can slide along the first track groove. In the present application, the shape of the first track groove can be obtained by fitting the process of the first housing mounting frame and the second housing mounting frame moving synchronously toward and away from each other relative to the main shaft, so that the first housing mounting frame and the second housing mounting frame can be synchronously rotated toward or away from each other relative to the main shaft by sliding the first connecting rod along the first track groove.

[0009] Using the hinge mechanism provided in this application, when the electronic device folds from an expanded state to a closed state, the first housing mount rotates clockwise relative to the main axis, causing the first connecting rod to slide along the first track groove toward the end of the first track groove away from the main axis, thereby rotating the first connecting rod about the main axis. The rotation of the first connecting rod drives the second connecting rod to rotate relative to the first connecting rod, which in turn drives the third connecting rod to rotate counterclockwise relative to the main axis. Because the third connecting rod is slidably connected to the second housing mount, it drives the second housing mount to rotate counterclockwise, thereby achieving synchronous, opposite-direction movement of the first and second housing mounts. Furthermore, during the electronic device's folding from the closed state to the expanded state, the movement directions of the various structures are opposite to the movement directions of the electronic device during the expanded to closed state, which will not be described in detail herein, to achieve synchronous, opposite-direction movement of the first and second housing mounts.

[0010] In the rotating shaft mechanism provided in the embodiment of the present application, the first connecting rod is rotatably connected to the main shaft and the second connecting rod, the second connecting rod is rotatably connected to the third connecting rod, and the axes of the various rotating shafts are parallel and do not overlap, so that the first connecting rod, the main shaft, the second connecting rod and the third connecting rod can be connected to form a four-bar linkage mechanism, which has a relatively simple structure. Therefore, while being able to realize the synchronous rotation of the first shell fixing frame and the second shell fixing frame toward or away from each other, the synchronization component can also occupy a smaller space in the rotating shaft mechanism, which is conducive to the miniaturization design of the rotating shaft mechanism.

[0011] In one possible implementation of the present application, the main shaft includes a base having a first arcuate groove, and the third connecting rod includes a first arcuate rotating block received in the first arcuate groove and slidable along the groove surface of the first arcuate groove. This allows the third connecting rod to be rotationally connected to the main shaft via a virtual axis, which can reduce the space occupied by the third connecting rod on the main shaft, thereby facilitating a miniaturized design of the rotating shaft mechanism.

[0012] In the present application, when the second connecting rod is rotatably connected to the third connecting rod, the second connecting rod can be rotatably connected to the first arc-shaped rotating block, which can help reduce the size of the synchronization component and thus achieve a miniaturized design of the rotating shaft mechanism.

[0013] In one possible implementation of the present application, the hinge mechanism further includes a rotating module, the rotating module including a first rotating assembly and a second rotating assembly, the first rotating assembly being located between the first and second housing mounts, and the second rotating assembly being located between the first and second housing mounts. The first rotating assembly includes a first swing arm, a first support arm, and a first connecting member, the first swing arm being rotationally connected to the main shaft, the first swing arm being slidably connected to the first housing mount, the first support arm being rotationally connected to the second housing mount, the first connecting member being located between the first swing arm and the first support arm, the first connecting member being rotationally connected to the first swing arm, and the first connecting member being rotationally connected to the first support arm. In addition, the main shaft is provided with a second trajectory groove, the first connecting member being movable along the second trajectory groove to limit the trajectory of motion of the first connecting member. The second rotating assembly includes a second swing arm, a second support arm, and a second connecting member, the second swing arm being rotationally connected to the main shaft, the second swing arm being slidably connected to the second housing mount, the second support arm being rotationally connected to the first housing mount, the second connecting member being located between the second swing arm and the second support arm, the second connecting member being rotationally connected to the second swing arm, and the second connecting member being rotationally connected to the second support arm. In addition, the main shaft is provided with a third track groove, and the second connecting member can move along the third track groove to limit the movement track of the second connecting member.

[0014] Based on the above-mentioned rotating shaft mechanism of the present application, when the electronic device moves from an expanded state to a closed state, the first shell fixing frame and the second shell fixing frame move toward each other. When the first shell fixing frame drives the first swing arm to rotate clockwise around the main axis, the first swing arm can drive the first connecting member to move toward the first swing arm in the first track groove of the main axis, thereby driving the first support arm to rotate counterclockwise around the main axis; when the second shell fixing frame drives the second swing arm to rotate counterclockwise around the main axis, the second swing arm can drive the second connecting member to move toward the second swing arm in the second track groove of the main axis, thereby driving the second support arm to rotate clockwise around the main axis. When the electronic device moves from a closed state to an unfolded state, the first housing fixing frame and the second housing fixing frame move in opposite directions. When the first housing fixing frame drives the first swing arm to rotate counterclockwise around the main axis, the first swing arm can drive the first connecting member to move within the first track groove of the main axis toward the first support arm, thereby driving the first support arm to rotate clockwise around the main axis. When the second housing fixing frame drives the second swing arm to rotate clockwise around the main axis, the second swing arm can drive the second connecting member to move within the second track groove of the main axis toward the second support arm, thereby driving the second support arm to rotate counterclockwise around the main axis. This realizes the folding and unfolding functions of the hinge mechanism.

[0015] In some existing hinge mechanisms, in order to ensure the stability of the mechanism, it is necessary to increase the thickness of the rotating assembly connected to the main shaft. This will make the main shaft and the hinge mechanism very thick. If the thickness is forcibly reduced, the strength of the rotating assembly will be weakened, which will greatly affect the reliability of the hinge mechanism and thus reduce the life of the electronic device. The hinge mechanism of the present application has a streamlined structure. Through the above structural relationship, the first connecting member and the second connecting member can slide in the main shaft to link the first swing arm, the second swing arm, the first support arm and the second support arm on the left and right sides. Therefore, the thickness and cross-section of the first connecting member and the second connecting member do not need to be made very thick to shuttle between the first track groove and the second track groove of the main shaft. At the same time, because the first connecting member and the second connecting member are respectively connected to the first swing arm (second swing arm) and the first support arm (second support arm), the first connecting member (second connecting member) has a sufficient length extending in the direction perpendicular to the axis, thus having sufficient strength to ensure the reliability of the hinge mechanism. In this way, the thickness of the main shaft and the thickness of the entire device can be reduced while maintaining the reliability of the hinge mechanism, making the entire hinge mechanism light and reliable.

[0016] In addition, since the first connecting member can move along a set trajectory within the first track groove, and the second connecting member can move along a set trajectory within the second track groove, uncontrolled movement of the first connecting member and the second connecting member can be avoided throughout the folding and unfolding process, thereby avoiding random movement of the first shell fixing frame and the second shell fixing frame, thereby ensuring the structural and movement stability of the entire hinge mechanism. In some cases, through reasonable design of the first track groove and the second track groove, the outer tangent of the hinge mechanism can also maintain a constant length throughout the folding and unfolding process, thereby allowing the flexible display covering the surface of the hinge mechanism to basically maintain a constant length. In this way, squeezing or pulling of the flexible display can be effectively avoided, thereby improving the structural reliability of the flexible display, and thus improving the structural reliability of the electronic device.

[0017] In a possible implementation of the present application, the main shaft includes a base and a cover plate, the cover plate is provided on the base, the base is provided with a second arc-shaped groove, and the cover plate includes a first protrusion provided toward the second arc-shaped groove, and the gap between the surface of the first protrusion and the groove surface of the second arc-shaped groove can serve as a second track groove. In addition, the first connecting member may include a first arc-shaped surface and a second arc-shaped surface, and when the electronic device is in the expanded state and the closed state, the first arc-shaped surface abuts the surface of the first protrusion, and the second arc-shaped surface abuts the groove surface of the second arc-shaped groove. As a result, the surface of the first protrusion and the groove surface of the second arc-shaped groove limit the first connecting member to the second track groove, so that when the hinge mechanism is in the expanded state and the closed state, the position of the first connecting member is relatively stable, and no virtual position shaking occurs, thereby improving the reliability of the hinge mechanism in the above two states.

[0018] In addition, the base may be provided with a fourth arcuate groove, and the cover may further include a third protrusion disposed toward the fourth arcuate groove. The gap between the surface of the third protrusion and the groove surface of the fourth arcuate groove serves as a third track groove. The second connector includes a third arcuate surface and a fourth arcuate surface. When the electronic device is in the expanded state and the closed state, the third arcuate surface abuts the surface of the third protrusion, and the fourth arcuate surface abuts the groove surface of the fourth arcuate groove. Thus, the surface of the third protrusion and the groove surface of the fourth arcuate groove constrain the second connector to the third track groove, so that the position of the second connector is relatively stable in the expanded state and the closed state of the hinge mechanism, without any virtual position shaking, thereby improving the reliability of the hinge mechanism in the above two states.

[0019] In one possible implementation of the present application, when the electronic device moves from an expanded state to a closed state, the first curved surface abuts the surface of the first protrusion, and a gap exists between the second curved surface and the groove surface of the second curved groove. When the electronic device moves from a closed state to an expanded state, the second curved surface abuts the groove surface of the second curved groove, and a gap exists between the first curved surface and the surface of the first protrusion. This results in the movement trajectory of the first connecting member within the second trajectory groove during the electronic device's transition from an expanded state to a closed state being different from the movement trajectory of the first connecting member within the second trajectory groove during the electronic device's transition from a closed state to an expanded state, which helps enhance the flexibility of the hinge mechanism design.

[0020] Furthermore, when the electronic device moves from an expanded state to a closed state, the third curved surface abuts the surface of the third protrusion, and a gap exists between the fourth curved surface and the groove surface of the fourth curved groove. However, when the electronic device moves from a closed state to an expanded state, the fourth curved surface abuts the groove surface of the fourth curved groove, and a gap exists between the third curved surface and the surface of the third protrusion. This results in a different trajectory for the second connecting member within the third trajectory groove when the electronic device moves from an expanded state to a closed state than when the electronic device moves from a closed state to an expanded state, which helps enhance the flexibility of the hinge mechanism design.

[0021] In the present application, the motion trajectory of the first connector within the second trajectory groove during the electronic device's transition from an expanded state to a closed state can be the same as the motion trajectory of the first connector within the second trajectory groove during the electronic device's transition from a closed state to an expanded state. Specifically, the spacing between the surface of the first protrusion and the groove surface of the second arcuate groove is equal at all locations. In this case, the second trajectory groove is a uniformly wide groove. During the transition from the expanded state to the closed state and vice versa, the first arcuate surface abuts the surface of the first protrusion, and the second arcuate surface abuts the groove surface of the second arcuate groove. This can help improve the stability of the first connector's movement within the second trajectory groove. Similarly, the distances between the surface of the third protrusion and the groove surface of the fourth arcuate groove can also be equal at all locations, so that the third track groove is a groove of equal width. In addition, when the electronic device changes from the expanded state to the closed state and from the closed state to the expanded state, the third arcuate surface abuts against the surface of the third protrusion, and the fourth arcuate surface abuts against the groove surface of the fourth arcuate groove, so that the movement trajectory of the second connecting member in the third track groove when the electronic device changes from the expanded state to the closed state is the same as the movement trajectory of the second connecting member in the third track groove when the electronic device changes from the closed state to the expanded state, thereby improving the stability of the second connecting member's movement in the third track groove.

[0022] In a possible implementation of the present application, the first curved surface of the first connecting member may be a circular arc surface, and the second curved surface may also be a circular arc surface. In this case, the sum of the radius of the first curved surface and the radius of the second curved surface can be equal to the distance between the surface of the first protrusion and the groove surface of the second curved groove, so as to improve the smoothness of the movement of the first connecting member in the second track groove.

[0023] Similarly, the third arc surface of the second connecting member can be a circular arc surface, and the fourth arc surface can also be a circular arc surface. In this case, the sum of the radius of the third arc surface and the radius of the fourth arc surface can be equal to the distance between the surface of the third protrusion and the groove surface of the fourth arc groove, so as to improve the smoothness of the movement of the second connecting member in the third track groove.

[0024] In this application, a first swing arm is rotationally connected to the spindle. A third arcuate slot is provided on the base, and the first swing arm includes a second arcuate rotating block. The second arcuate rotating block is accommodated in the third arcuate slot and can slide along the slot surface of the third arcuate slot to achieve the rotational connection between the first swing arm and the spindle. This allows the first swing arm to be rotationally connected to the spindle via a virtual axis, which helps reduce the space occupied by the first swing arm on the spindle, thereby facilitating a miniaturized design of the rotating shaft mechanism.

[0025] The second swing arm is also rotationally connected to the main shaft. The base is further provided with a fifth arcuate slot. The second swing arm includes a third arcuate rotating block, which is accommodated in the fifth arcuate slot and can slide along the slot surface of the fifth arcuate slot to achieve the rotational connection between the second swing arm and the main shaft. This creates a rotational connection between the second swing arm and the main shaft via a virtual axis, which helps reduce the space occupied by the second swing arm on the main shaft, thereby facilitating a miniaturized design of the rotating shaft mechanism.

[0026] It is understood that for an outward-folding electronic device, the first swing arm is rotatably connected to the main axis via a virtual axis or a solid axis, and the axis of rotation of the first swing arm around the main axis is located on the side of the main axis facing away from the flexible display. Furthermore, the second swing arm is rotatably connected to the main axis via a virtual axis or a solid axis, and the axis of rotation of the second swing arm around the main axis is located on the side of the main axis facing away from the flexible display.

[0027] In order to improve the reliability of the connection between the first swing arm and the main shaft, in the present application, the cover plate also includes a second protrusion arranged toward the third arc-shaped groove, and at least a portion of the second arc-shaped rotating block is located between the second protrusion and the third arc-shaped groove, so that the first swing arm is limited to the main shaft by the second protrusion and the third arc-shaped groove, thereby preventing the first swing arm from escaping from the third arc-shaped groove.

[0028] In addition, the cover plate also includes a fourth protrusion arranged toward the fifth arc-shaped groove, and at least a portion of the third arc-shaped rotating block is located between the fourth protrusion and the fifth arc-shaped groove, so that the second swing arm is limited to the main shaft through the fourth protrusion and the fifth arc-shaped groove, thereby preventing the second swing arm from escaping from the fourth arc-shaped groove.

[0029] In a possible implementation of the present application, the first connecting member includes a first rotating shaft and a second rotating shaft. The first connecting member is rotationally connected to the first swing arm through the first rotating shaft, and the first connecting member is rotationally connected to the first support arm through the second rotating shaft. The axis of the first rotating shaft is parallel to the axis of the second rotating shaft and does not overlap, so that the first swing arm and the first support arm can achieve mutual pulling movement through the first connecting member.

[0030] The second connecting member includes a third rotating shaft and a fourth rotating shaft. The second connecting member and the second swing arm are rotationally connected through the third rotating shaft. The second connecting member and the second support arm are rotationally connected through the fourth rotating shaft. The axis of the third rotating shaft is parallel to the axis of the fourth rotating shaft and does not overlap, so that the second swing arm and the second support arm can achieve mutual pulling movement through the second connecting member.

[0031] When the first swing arm and the first connecting member are rotationally connected via the first rotating shaft, the second arcuate rotating block can be provided with a first mounting groove, with the opening of the first mounting groove facing the third arcuate groove. The first rotating shaft is mounted in the first mounting groove, with a portion of the first rotating shaft surface contacting the groove surface of the first mounting groove, and a portion of the first rotating shaft surface contacting the groove surface of the third arcuate groove. By mounting the first rotating shaft in the open first mounting groove of the second arcuate rotating block so as to contact the groove surface of the third arcuate groove, the size of the second arcuate rotating block can be effectively reduced, eliminating the need to increase the thickness of the first mounting groove due to the size of the first rotating shaft, thereby facilitating a miniaturized design of the rotating shaft mechanism.

[0032] In addition, the groove surface of the first mounting groove includes a first arc surface, and the surface of the first rotating shaft used to contact the groove surface of the first mounting groove is a second arc surface. The center of the first arc surface coincides with the center of the second arc surface. In this way, when the second arc rotating block slides along the groove surface of the third arc groove, the first rotating shaft can rotate relative to the second arc rotating block to realize the rotational connection between the first swing arm and the first rotating shaft.

[0033] The groove surface of the third arc groove is a third arc surface, and the surface of the first rotating shaft used to contact the groove surface of the third arc groove is a fourth arc surface. The center of the third arc surface coincides with the center of the fourth arc surface. In this way, while the first rotating shaft slides along the groove surface of the third arc groove with the second arc rotating block, the first rotating shaft can also rotate relative to the second arc rotating block and the third arc groove, thereby facilitating the movement of the first connecting member relative to the main shaft.

[0034] Similarly, the third arc-shaped rotating block is provided with a second mounting slot, the opening of which faces the fifth arc-shaped slot. The third rotating shaft is mounted in the open second mounting slot so as to contact the slot surface of the fifth arc-shaped slot. A portion of the third rotating shaft's surface contacts the slot surface of the second mounting slot, and a portion of the third rotating shaft's surface contacts the slot surface of the fifth arc-shaped slot. By mounting the second rotating shaft in the second mounting slot of the third arc-shaped rotating block, the size of the third arc-shaped rotating block can be effectively reduced, eliminating the need to increase the thickness of the second mounting slot due to the size of the second rotating shaft, thereby facilitating a miniaturized design of the rotating shaft mechanism.

[0035] The second mounting groove may include a fifth arcuate surface, the surface of the third rotating shaft that contacts the groove surface of the second mounting groove may be a sixth arcuate surface, and the center of the fifth arcuate surface coincides with the center of the sixth arcuate surface. Alternatively, the groove surface of the fifth arcuate groove may be a seventh arcuate surface, and the surface of the third rotating shaft that contacts the groove surface of the fifth arcuate groove may be an eighth arcuate surface, and the center of the seventh arcuate surface coincides with the center of the eighth arcuate surface. Thus, while the third rotating shaft slides along the groove surface of the fifth arcuate groove with the third arcuate rotating block, it can also rotate relative to the third arcuate rotating block and the fifth arcuate groove, thereby facilitating movement of the second connecting member relative to the main shaft.

[0036] In one possible implementation of the present application, the first connecting member may include a plurality of first sub-connecting members that are sequentially rotatably connected. Furthermore, the plurality of first sub-connecting members may be located between the first swing arm and the first support arm, such that the first swing arm can be rotatably connected to adjacent first sub-connecting members, and the first support arm can be rotatably connected to adjacent first sub-connecting members. The connection between the first swing arm and the first support arm via the plurality of first sub-connecting members can effectively improve the speed uniformity of the first swing arm and the first support arm during rotation about the main axis, thereby enhancing the smoothness of the mutual pulling motion between the first swing arm and the first support arm.

[0037] Additionally, the second connecting member may include multiple second sub-connecting members that are sequentially rotatably connected. Furthermore, these multiple second sub-connecting members may be located between the second swing arm and the second support arm, allowing the second swing arm to be rotatably connected to adjacent second sub-connecting members, and the second support arm to be rotatably connected to adjacent second sub-connecting members. The connection between the second swing arm and the second support arm via the multiple second sub-connecting members effectively improves the speed uniformity of the second swing arm and the second support arm during rotation about the main axis, thereby enhancing the smoothness of the mutual pulling motion between the second swing arm and the second support arm.

[0038] In a second aspect, the present application also provides an electronic device, which includes a first shell, a second shell, a flexible display screen and the hinge mechanism of the first aspect, wherein the first shell and the second shell are respectively arranged on opposite sides of the hinge mechanism, the first shell fixing frame is fixedly connected to the first shell, and the second shell fixing frame is fixedly connected to the second shell. The flexible display screen continuously covers the first shell, the second shell and the hinge mechanism, and the flexible display screen is fixedly connected to the first shell and the second shell. When the electronic device is in the unfolded state, the hinge mechanism, the first shell and the second shell together play the role of flattening support for the flexible display screen, thereby ensuring the integrity of the shape of the electronic device in the unfolded state. In the process of the electronic device changing from the unfolded state to the closed state, the two shells rotate synchronously towards each other, driving the flexible display screen to rotate, and in the process of the electronic device changing from the closed state to the unfolded state, the two shells rotate synchronously away from each other, driving the flexible display screen to rotate, which can effectively prevent the flexible display screen from deformation, thereby reducing the risk of damage to the flexible display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application when in a closed state;

[0040] FIG2a is a schematic structural diagram of an electronic device provided in an embodiment of the present application when in an unfolded state;

[0041] FIG2 b is another structural schematic diagram of the electronic device provided in an embodiment of the present application when in an unfolded state;

[0042] FIG3 is a schematic structural diagram of a rotating shaft mechanism provided in an embodiment of the present application;

[0043] FIG4 is an exploded view of the rotating shaft mechanism shown in FIG3 ;

[0044] FIG5 is an enlarged view of the partial structure of the shaft mechanism at point A shown in FIG3 ;

[0045] FIG6 is a BB sectional view of the rotating shaft mechanism shown in FIG5 ;

[0046] FIG7 is a schematic diagram of a partial structure of a base provided in an embodiment of the present application;

[0047] FIG8 is a schematic structural diagram of the rotating shaft mechanism shown in FIG6 when the electronic device is in an intermediate state;

[0048] FIG9 is a schematic structural diagram of the rotating shaft mechanism shown in FIG8 when the electronic device is in a closed state;

[0049] FIG10 is a cross-sectional view of the first connecting member of the rotating shaft mechanism provided by an embodiment of the present application when the electronic device is in an unfolded state;

[0050] FIG11 is a schematic structural diagram of a main shaft provided in an embodiment of the present application;

[0051] FIG12 is a schematic structural diagram of the cover plate of the main shaft shown in FIG11 ;

[0052] FIG13 is a cross-sectional view of the first connecting member of the rotating shaft mechanism provided by an embodiment of the present application when the electronic device is in a closed state;

[0053] FIG14 is a schematic structural diagram of a first connecting member provided in an embodiment of the present application;

[0054] FIG15 is a schematic diagram of the assembly structure of the first connecting member and the main shaft provided in an embodiment of the present application;

[0055] FIG16 is a CC sectional view of the rotating shaft mechanism shown in FIG3 ;

[0056] FIG17 is a cross-sectional view of the first swing arm of the hinge mechanism provided by an embodiment of the present application when the electronic device is in a closed state;

[0057] FIG18 is a schematic structural diagram of a first rotating assembly provided in an embodiment of the present application;

[0058] FIG19 is a schematic structural diagram of a first swing arm provided in an embodiment of the present application;

[0059] FIG20 is a schematic diagram of the motion mechanism of the rotating shaft mechanism provided in an embodiment of the present application;

[0060] FIG21 is a schematic diagram of a partial structure of a rotating shaft mechanism provided in an embodiment of the present application;

[0061] FIG22 is a schematic structural diagram of the inward-folding electronic device provided in an embodiment of the present application when in a closed state.

[0062] Reference Signs: 1-rotating shaft mechanism; 1a-bearing surface; 1b-third exterior surface; 101-main shaft; 1011-base; 10111-first arcuate groove; 101111-groove surface of the first arcuate groove; 10112-second arcuate groove; 101121-groove surface of the second arcuate groove; 10113-third arcuate groove; 101131-third arcuate surface; 10114-fourth arcuate groove; 101141-seventh arcuate surface; 10115-fifth arcuate groove; 101151-groove surface of the fifth arcuate groove; 1012-cover plate; 10121-first protrusion; 101211-surface of the first protrusion; 10122-second protrusion; 101221 - Surface of the second protrusion; 10123 - First plug-in portion; 10124 - Third protrusion; 101241 - Surface of the third protrusion; 10125 - Fourth protrusion; 101251 - Surface of the fourth protrusion; 1013 - Second track groove; 1014 - Third track groove; 102 - Synchronizing assembly; 1021 - First connecting rod; 10211 - Guide structure; 1022 - Second connecting rod; 1023 - Third connecting rod; 10231 - First arc-shaped rotating block; 1024 - First axis; 1025 - Second axis; 1026 - Third axis; 103 - First housing fixing bracket; 1031 - Guide portion; 10311 - First track groove; 1032 - First mounting portion; 1033 - Second slide groove; 104 - Second housing fixing frame; 1041 - First slide groove; 1042 - Second mounting portion; 1043 - Third slide groove; 105 - Rotation module; 1051 - First rotation assembly; 10511 - First swing arm; 105111 - Second arc-shaped rotation block; 1051111 - First recessed portion; 1051112 - First mounting groove; 10511121 - First arc surface; 10512 - First support arm; 10513 - First connecting member; 105131 - First rotation axis; 1051311 - Second arc surface; 1051312 - Fourth arc surface; 105132 - Second rotation axis; 105133 - First arc surface; 105134 - Second arc surface; 1052-second rotating assembly; 10521-second swing arm; 105211-third arc-shaped rotating block; 1052111-second recess; 1052112-second mounting slot; 10521121-fifth arc surface; 10522-second support arm; 10523-second connecting piece; 105231-third rotating shaft; 1052311-sixth arc surface; 1052312-eighth arc surface; 105232-fourth rotating shaft; 105233-third arc surface; 105234-fourth arc surface; 2-first shell; 2a-first supporting surface; 2b-first appearance surface; 3-second shell; 3a-second supporting surface; 3b-second appearance surface; 4-flexible display screen; 5-screen space. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "a", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0064] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0065] To facilitate understanding of the hinge mechanism provided in the embodiments of the present application, its application scenarios are first described below. The hinge mechanism can be used, but is not limited to, in foldable electronic devices such as mobile phones, personal digital assistants (PDAs), laptop computers, or tablet computers. In the present application, the electronic device can be either an outward-folding or inward-folding electronic device. In the case of an outward-folding electronic device, the flexible display screen remains on the outside of the electronic device during the transition from an unfolded state to a closed state. In the case of an inward-folding electronic device, the flexible display screen is located on the inside of the electronic device when the device is in the closed state. In the embodiments of the present application, the application of the hinge mechanism in an electronic device is described using an outward-folding electronic device as an example. FIG. 1 is a schematic structural diagram of the electronic device provided in the embodiments of the present application in a closed state. In addition to the hinge mechanism 1, the electronic device may also include two housings and a flexible display screen. For ease of description, the two housings may be designated as a first housing 2 and a second housing 3, respectively. The first housing 2 and the second housing 3 are located on either side of the hinge mechanism 1 and are rotatable about the hinge mechanism 1. When in use, the electronic device can be closed and unfolded according to different usage scenarios.

[0066] FIG1 shows the relative positional relationship between the hinge mechanism 1 and the two shells when the electronic device is in a closed state. At this time, the first surface of the hinge mechanism 1, the first surface of the first shell, and the first surface of the second shell can collectively serve as the support surface of the flexible display screen (not shown in FIG1 ). The flexible display screen is omitted in FIG1 , and the first surface of the hinge mechanism 1 refers to the surface of the hinge mechanism 1 facing the flexible display screen, the first surface of the first shell 2 refers to the surface of the first shell 2 facing the flexible display screen, and the first surface of the second shell 3 refers to the surface of the second shell 3 facing the flexible display screen. For ease of description, in this application, the first surface of the hinge mechanism 1 can be defined as the bearing surface 1a of the hinge mechanism 1, the first surface of the first shell 2 can be defined as the first supporting surface 2a, and the first surface of the second shell 3 can be defined as the second supporting surface 3a.

[0067] Referring to Figure 2a, Figure 2a illustrates a schematic structural diagram of the electronic device in an unfolded state, and shows the structure of the first supporting surface 2a of the first housing 2 and the second supporting surface 3a of the second housing 3. In this unfolded state, the bearing surface 1a of the hinge mechanism 1, the first supporting surface 2a of the first housing 2, and the second supporting surface 3a of the second housing 3 are connected to form a flat supporting surface.

[0068] Based on this, the flexible display can continuously cover the bearing surface 1a of the hinge mechanism 1, the first support surface 2a of the first housing 2, and the second support surface 3a of the second housing 3. The hinge mechanism 1 is arranged corresponding to the bendable portion of the flexible display, and the flexible display can be fixedly connected to the first support surface 2a of the first housing 2 and the second support surface 3a of the second housing 3. The connection method can be, but is not limited to, adhesive bonding. In this way, when the electronic device is in the unfolded state as shown in Figure 2a, the hinge mechanism 1, the first housing 2, and the second housing 3 can provide a flat support for the flexible display.

[0069] In addition, reference may be made to Figure 2b, which is another structural schematic diagram of the electronic device provided in an embodiment of the present application when in an unfolded state. Figure 2b shows the structure of the second surface of the hinge mechanism 1, the second surface of the first shell 2, and the second surface of the second shell 3. Among them, the second surface of the hinge mechanism 1 refers to the surface of the hinge mechanism 1 facing away from the flexible display screen, the second surface of the first shell 2 refers to the surface of the first shell 2 facing away from the flexible display screen, and the second surface of the second shell 3 refers to the surface of the second shell 3 facing away from the flexible display screen. Then, the first surface and the second surface of the hinge mechanism 1 are arranged opposite to each other, the first surface and the second surface of the first shell 2 are arranged opposite to each other, and the first surface and the second surface of the second shell 3 are arranged opposite to each other. In this application, the second surface of the hinge mechanism 1, the second surface of the first shell 2, and the second surface of the second shell 3 can be regarded as the appearance surface of the electronic device. For the convenience of description, the second surface of the first shell 2 can be defined as the first appearance surface 2b, the second surface of the second shell 3 can be defined as the second appearance surface 3b, and the second surface of the hinge mechanism 1 can be defined as the third appearance surface 1b. It is understood that for an outward-folding electronic device, its exterior surface is exposed on the outside of the electronic device when the electronic device is in the unfolded state; and when the electronic device is in the closed state, its exterior surface is located on the inside of the electronic device. In the present application, during the relative rotation of the first shell 2 and the second shell 3 from the unfolded state shown in FIG. 2a or FIG. 2b to the closed state shown in FIG. 1 , or from the closed state shown in FIG. 1 to the unfolded state shown in FIG. 2a or FIG. 2b , the flexible display screen can bend or flatten along with the first shell 2 and the second shell 3. In addition, it is understood that the process of the electronic device from the unfolded state shown in FIG. 2a or FIG. 2b to the closed state shown in FIG. 1 , or from the closed state shown in FIG. 1 to the unfolded state shown in FIG. 2a or FIG. 2b , is the process of the first shell 2 and the second shell 3 rotating around the hinge mechanism 1.

[0070] The hinge mechanism 1, a key functional component in a foldable electronic device, can be positioned relative to the foldable portion of the flexible display. If the forces applied to the flexible display by the first and second housings 2 and 3 of the electronic device are not synchronized during rotation about the hinge mechanism 1, the flexible display may experience uneven force, squeezing or pulling the display, or even damage it.

[0071] In view of this, the hinge mechanism provided by the present application is provided with a synchronization component to achieve synchronous movement of the first shell and the second shell of the electronic device toward or away from each other around the hinge mechanism, thereby achieving synchronous movement of the portion of the flexible display connected to the first shell and the portion of the flexible display connected to the second shell toward or away from each other, which can improve the uniformity of the force applied to the flexible display, thereby effectively reducing the risk of the flexible display being squeezed or pulled, thereby extending the service life of the flexible display and further improving the structural reliability of the electronic device. To facilitate understanding of the hinge mechanism provided in the embodiment of the present application, its specific structure is described in detail below with reference to the accompanying drawings.

[0072] Referring to Figure 3, Figure 3 is a schematic structural diagram of the rotating shaft mechanism 1 provided in an embodiment of the present application. In the present application, the rotating shaft mechanism 1 may include a main shaft 101 and a synchronization component 102. The present application does not limit the number of synchronization components 102 in the rotating shaft mechanism 1. The rotating shaft mechanism 1 may include only one synchronization component 102 or multiple synchronization components 102. When the rotating shaft mechanism 1 includes multiple synchronization components 102, the multiple synchronization components 102 may be arranged at intervals along the length direction of the rotating shaft mechanism 1. In the present application, the length direction of the rotating shaft mechanism 1 is the extension direction of the axis of rotation of the first shell 2 and the second shell 3 shown in Figure 2b around the rotating shaft mechanism 1.

[0073] In the present application, when the synchronization component 102 is specifically configured, reference may be made to FIG4 , which is an exploded view of the rotating shaft mechanism 1 shown in FIG3 . The synchronization component 102 may include a first connecting rod 1021, a second connecting rod 1022, and a third connecting rod 1023. In addition, reference may be made to FIG5 , which is an enlarged view of the partial structure at A of the rotating shaft mechanism 1 shown in FIG3 . The second connecting rod 1022 is located between the first connecting rod 1021 and the third connecting rod 1023. The second connecting rod 1022 is rotationally connected to the first connecting rod 1021, and the second connecting rod 1022 is rotationally connected to the third connecting rod 1023. The axis of the rotational connection between the second connecting rod 1022 and the first connecting rod 1021 is parallel to and does not overlap with the axis of the rotational connection between the second connecting rod 1022 and the third connecting rod 1023.

[0074] Referring to Figure 6, Figure 6 is a BB cross-sectional view of the rotating shaft mechanism 1 shown in Figure 5. The first connecting rod 1021 is also rotatably connected to the main shaft 101. In the present application, the axis of rotation of the first connecting rod 1021 around the main shaft 101 and the axis of rotation of the second connecting rod 1022 and the first connecting rod 1021 are parallel and do not overlap. In the present application, for ease of description, the rotating shaft rotatably connected to the first connecting rod 1021 and the second connecting rod 1022 can be defined as the first shaft 1024, the rotating shaft rotatably connected to the second connecting rod 1022 and the third connecting rod 1023 can be defined as the second shaft 1025, and the rotating shaft rotatably connected to the first connecting rod 1021 and the main shaft 101 can be defined as the third shaft 1026. Then, the axes of the first shaft 1024, the second shaft 1025 and the third shaft 1026 are parallel and do not overlap, so that a four-bar linkage can be formed between the first connecting rod 1021, the main shaft 101, the second connecting rod 1022 and the third connecting rod 1023.

[0075] 5 and 6 , the third connecting rod 1023 is rotationally connected to the main shaft 101. In the present application, the manner in which the third connecting rod 1023 is rotationally connected to the main shaft 101 is not limited. For example, the third connecting rod 1023 can be rotationally connected to the main shaft 101 via a virtual axis. This can help reduce the space occupied by the third connecting rod 1023 on the main shaft 101, thereby helping to reduce the volume of the rotating module 105, so as to facilitate the miniaturization of the hinge mechanism 1. In addition, it can be understood that for an outward-folding electronic device, when the third connecting rod 1023 is rotationally connected to the main shaft 101 via a virtual axis, the axis of rotation of the third connecting rod 1023 around the main shaft 101 is located on the side of the main shaft 101 that is away from the flexible display screen.

[0076] It is worth mentioning that in the present application, a virtual axis refers to the axis of an arc-shaped structure, and two rotatably connected parts can rotate relative to the virtual axis, and as the two rotatably connected parts rotate relative to each other, the position of the virtual axis is fixed. Exemplarily, as shown in Figure 6, the main shaft 101 includes a base 1011. Referring to Figure 7, Figure 7 is a schematic diagram of the partial structure of the base 1011 provided in an embodiment of the present application, and the base 1011 is provided with a first arc-shaped groove 10111. Referring to Figures 6 and 7 together, the third connecting rod 1023 includes a first arc-shaped rotating block 10231, and the first arc-shaped rotating block 10231 is accommodated in the first arc-shaped groove 10111, and the first arc-shaped rotating block 10231 can slide along the groove surface 101111 of the first arc-shaped groove, thereby realizing the rotation of the third connecting rod 1023 around the base 1011 by sliding the first arc-shaped rotating block 10231 along the groove surface 101111 of the first arc-shaped groove. In addition, in the present application, the first arc-shaped rotating block 10231 may be, but is not limited to, a circular arc-shaped rotating block, and the first arc-shaped groove 10111 may be, but is not limited to, a circular arc-shaped groove. It is understood that when the first arc-shaped rotating block 10231 is a circular arc-shaped rotating block, its surface for contact with the groove surface 101111 of the first arc-shaped groove may be a circular arc surface, and the groove surface 101111 of the first arc-shaped groove may also be a circular arc surface, with the centers of the two circular arc surfaces coinciding.

[0077] Referring to Figures 5 and 6 , in the present application, the spindle 101 mechanism may further include a first housing mount 103 and a second housing mount 104, with the first housing mount 103 and the second housing mount 104 being disposed on opposite sides of the spindle 101. A first connecting rod 1021 is located on the same side of the spindle 101 as the first housing mount 103 and is slidably connected thereto. Referring to Figures 5 and 6 , the first housing mount 103 may be provided with a first track groove 10311, along which the first connecting rod 1021 can slide. Specifically, as shown in Figure 5 , the first housing mount 103 includes a guide portion 1031, which may be configured as a receiving groove. Thus, along the extension direction of the axis of rotation of the first housing mount 103 about the spindle 101, the guide portion 1031 may include two opposing groove walls, each of which may be provided with a first track groove 10311.

[0078] The first connecting rod 1021 is mounted on the guide portion 1031. Furthermore, the first connecting rod 1021 may be provided with a guide structure 10211 corresponding to each first track groove 10311. The guide structure 10211 is inserted into the first track groove 10311, and when the electronic device moves from an unfolded state to a closed state, or from a closed state to an open state, the guide structure 10211 may slide along the first track groove 10311. In this application, the specific structure of the guide structure 10211 is not limited. For example, the guide structure 10211 may be a pin extending through the first connecting rod 1021, and the two ends of the pin may be inserted into a corresponding first track groove 10311.

[0079] Continuing with FIG6 , the third connecting rod 1023 and the second housing fixing frame 104 are located on the same side of the base 1011 and are slidably connected to the second housing fixing frame 104. Specifically, the second housing fixing frame 104 is provided with a first sliding groove 1041 extending in a first direction. The third connecting rod 1023 can be mounted in the first sliding groove 1041. When the electronic device moves from an unfolded state to a closed state, or vice versa, the third connecting rod 1023 can slide within the first sliding groove 1041 relative to the second housing fixing frame 104 in a direction toward or away from the base 1011. Furthermore, to prevent the third connecting rod 1023 from falling out of the first sliding groove 1041, a first slideway can be provided on the groove wall of the first sliding groove 1041, and a first slider can be provided on the third connecting rod 1023. In this way, the first slider can be clamped in the first slideway and can slide along the first slideway to limit the third connecting rod 1023 in the first slide groove 1041. In addition, by providing the first slideway on the groove wall of the first slide groove 1041, it can provide a guide for the sliding of the third connecting rod 1023 along the first slide groove 1041, thereby improving the stability of the movement of the third connecting rod 1023.

[0080] In the present application, the specific setting form of the first slide groove 1041 is not limited. It can be an exemplary linear slide groove, and the first slider can be set to a linear slider structure, which can effectively simplify the connection structure between the third connecting rod 1023 and the second shell fixing frame 104, and can improve the smoothness of the sliding of the third connecting rod 1023 relative to the second shell fixing frame 104.

[0081] Based on the above introduction to the structure of the rotating shaft mechanism 1 provided in the present application, in the present application, the shape of the first track groove 10311 can be fitted according to the process of synchronous movement of the first shell fixing frame 103 and the second shell fixing frame 104 relative to the main shaft 101 toward and away from each other, so that the first shell fixing frame 103 and the second shell fixing frame 104 can be synchronously rotated toward or away from each other relative to the main shaft 101 by sliding the first connecting rod 1021 along the first track groove 10311.

[0082] Referring to Figure 8, Figure 8 is a schematic diagram of the structure of the hinge mechanism 1 shown in Figure 6 when the electronic device is in an intermediate state. During the folding process of the electronic device from the expanded state to the closed state, the first housing mounting bracket 103 rotates clockwise relative to the main shaft 101, causing the first connecting rod 1021 to slide along the first track groove 10311 toward the end of the first track groove 10311 away from the main shaft 101, thereby causing the first connecting rod 1021 to rotate about the main shaft 101. The rotation of the first connecting rod 1021 drives the second connecting rod 1022 to rotate relative to the first connecting rod 1021, which in turn drives the third connecting rod 1023 to rotate relative to the main shaft 101. Since the first connecting rod 1021 rotates about the main shaft 101, the first shaft 1024 is driven away from the main shaft 101. At this time, the second shaft 1025 can move toward the main shaft 101, thereby driving the third connecting rod 1023 to rotate counterclockwise relative to the main shaft 101. Since the third connecting rod 1023 is slidably connected to the second housing fixing frame 104 , the third connecting rod 1023 can drive the second housing fixing frame 104 to rotate counterclockwise, thereby achieving synchronous opposite movement of the first housing fixing frame 103 and the second housing fixing frame 104 .

[0083] Referring to Figure 9, Figure 9 is a schematic diagram of the structure of the hinge mechanism 1 shown in Figure 8 when the electronic device is in a closed state. During the process of folding the electronic device from the intermediate state to the closed state, the first shell fixing frame 103 continues to rotate clockwise relative to the main shaft 101, and drives the second shell fixing frame 104 to continue to rotate counterclockwise relative to the main shaft 101 through the synchronization component 102 until the electronic device is in a closed state. In addition, during the process of the electronic device moving from the closed state to the expanded state, the movement direction of each structure is opposite to the movement direction of the electronic device moving from the expanded state to the closed state, which will not be described in detail here, so as to achieve the synchronous opposite movement of the first shell fixing frame 103 and the second shell fixing frame 104.

[0084] In the rotating shaft mechanism 1 provided in the embodiment of the present application, the first connecting rod 1021 is rotatably connected to the main shaft 101 and the second connecting rod 1022, the second connecting rod 1022 is rotatably connected to the third connecting rod 1023, and the axes of the various rotating shafts are parallel and do not overlap, so that the first connecting rod 1021, the main shaft 101, the second connecting rod 1022 and the third connecting rod 1023 can be connected to form a four-bar linkage mechanism, which has a relatively simple structure. Therefore, while being able to realize the synchronous rotation of the first shell fixing frame 103 and the second shell fixing frame 104 toward or away from each other, the synchronization component 102 can also occupy a smaller space in the rotating shaft mechanism 1, which is conducive to the miniaturization design of the rotating shaft mechanism 1.

[0085] The hinge mechanism 1 provided in the above embodiment of the present application can be used for an outward-folding electronic device, for example, as shown in FIG1 or FIG2a. Among them, the first shell fixing frame 103 can be fixedly connected to the shell located on the same side of the main shaft 101, and the second shell fixing frame 104 can be fixedly connected to another shell. Exemplarily, the first shell fixing frame 103 can be used to be fixedly connected to the first shell 2 of the electronic device shown in FIG2a, and the second shell fixing frame 104 can be used to be fixedly connected to the second shell 3 of the electronic device shown in FIG2a. Based on this, it can be understood that the process of the first shell fixing frame 103 and the second shell fixing frame 104 rotating synchronously in opposite directions, that is, the process of the first shell 2 and the second shell 3 rotating synchronously in opposite directions.

[0086] In addition, the flexible display screen of the electronic device can be fixedly connected to the first shell 2 and the second shell 3, and the connection method can be, but is not limited to, bonding. In a specific implementation, the flexible display screen can be bonded to a partial area of ​​the first support surface 2a of the first shell 2, and the flexible display screen can be bonded to a partial area of ​​the second support surface 3a of the second shell 3, so that when the electronic device is in the unfolded state, the bearing surface 1a of the hinge mechanism 1, the first support surface 2a of the first shell 2, and the second support surface 3a of the second shell 3 can jointly play the role of flattening the flexible display screen, thereby ensuring the integrity of the shape of the electronic device in the unfolded state. In the process of the electronic device changing from the unfolded state to the closed state, the synchronous rotation of the two shells can drive the synchronous rotation of the part of the flexible display screen that is fixedly connected to the two shells, which can make the force on the flexible display screen more uniform, thereby effectively avoiding deformation of the flexible display screen and reducing the risk of damage to the flexible display screen.

[0087] In the present application, to achieve the rotation function of the hinge mechanism 1, the hinge mechanism 1 may further include a rotation module 105. The present application does not limit the number of rotation modules 105 in the hinge mechanism 1. The hinge mechanism 1 may include only one rotation module 105 or multiple rotation modules 105. Continuing with FIG. 3 , when the hinge mechanism 1 includes multiple rotation modules 105, the multiple rotation modules 105 may be arranged at intervals along the length of the hinge mechanism 1.

[0088] To facilitate understanding of the structure of the rotating module 105, referring to FIG4 , the rotating module 105 may include a first rotating assembly 1051 and a second rotating assembly 1052. The first rotating assembly 1051 is located between the first housing fixing frame 103 and the second housing fixing frame 104, and the second rotating assembly 1052 is located between the first housing fixing frame 103 and the second housing fixing frame 104. Furthermore, as shown in FIG4 , the main shaft 101 of the rotating shaft mechanism 1 may serve as a bearing member for the first rotating assembly 1051 and the second rotating assembly 1052.

[0089] It is worth mentioning that in the embodiment of the present application, when there are multiple rotating modules 105, the first rotating components 1051 and the second rotating components 1052 of the multiple rotating modules 105 can all use the same main shaft 101 as a bearing component to improve the integration of the rotating shaft mechanism 1. In other possible embodiments of the present application, the rotating shaft mechanism 1 can be provided with a main shaft 101 corresponding to each rotating module 105, so that the first rotating component 1051 and the second rotating component 1052 of each rotating module 105 use the corresponding main shaft 101 as a bearing component.

[0090] Continuing with FIG4 , the first rotating assembly 1051 may include a first swing arm 10511, a first support arm 10512, and a first connecting member 10513. The first connecting member 10513 is located between the first swing arm 10511 and the first support arm 10512. The first connecting member 10513 is rotationally connected to the first swing arm 10511, and the first connecting member 10513 is rotationally connected to the first support arm 10512, so that the first swing arm 10511 and the first support arm 10512 are pulled against each other via the first connecting member 10513. It can be understood that the motion trajectory of the first connecting member 10513 plays a key role in the motion trajectory of the first rotating assembly 1051.

[0091] In the present application, the first connecting member 10513 is movable relative to the main shaft 101. For a specific implementation, refer to Figure 10, which is a cross-sectional view of the first connecting member 10513 of the hinge mechanism 1 provided in an embodiment of the present application, when the electronic device is in the unfolded state. The main shaft 101 may be provided with a second track groove 1013, along which the first connecting member 10513 can move, thereby limiting the movement trajectory of the first connecting member 10513.

[0092] Referring to Figure 11, Figure 11 is a structural schematic diagram of the main shaft 101 provided in this application. The main shaft 101 may also include a cover plate 1012, and the cover plate 1012 is covered on the base 1011, and the outer surface of the cover plate 1012 can serve as the third appearance surface 1b of the rotating shaft mechanism 1. As shown in Figure 7, the base 1011 can be provided with a second arc-shaped groove 10112. Referring to Figure 7 and Figure 10 together, the first connecting member 10513 is accommodated in the second arc-shaped groove 10112, and the first connecting member 10513 can slide along the groove surface 101121 of the second arc-shaped groove. In addition, referring to Figure 12, Figure 12 is a structural schematic diagram of the cover plate 1012 of the main shaft 101 shown in Figure 11, and Figure 12 is used to show the structure of the cover plate 1012 facing the base 1011. The cover plate 1012 includes a first protrusion 10121 , which can be arranged toward the second arc-shaped groove 10112 . There is a gap between the surface 101211 of the first protrusion and the groove surface 101121 of the second arc-shaped groove, and the gap serves as the second track groove 1013 .

[0093] Figure 13 is a cross-sectional view of the first connecting member 10513 of the hinge mechanism 1 provided in an embodiment of the present application when the electronic device is in a closed state. Figures 12 and 13 may be referred to together. When the electronic device is in a process of moving from an expanded state to a closed state, the first connecting member 10513 may move toward the first swing arm 10511 in the second track groove 1013, and when the electronic device is in a process of moving from a closed state to an expanded state, the first connecting member 10513 may move toward the first support arm 10512 in the second track groove 1013, thereby enabling the first connecting member 10513 to move relative to the main shaft 101 according to a set track.

[0094] 12 and 13 , it can be seen that when the electronic device moves from an expanded state to a closed state, or vice versa, the first swing arm 10511 and the first support arm 10512 can rotate about the main axis 101. Furthermore, because the first swing arm 10511 and the first support arm 10512 are mutually pulled by the first connecting member 10513, the first connecting member 10513 can also rotate relative to the first raised surface 101211 and the groove surface 101121 of the second arc-shaped groove during its movement within the second track groove 1013, thereby improving the smoothness of the movement of the first rotating assembly 1051.

[0095] Referring to Figure 14 , Figure 14 is a schematic diagram of the structure of a first connecting member 10513 provided in an embodiment of the present application. In the present application, the first connecting member 10513 may include a first curved surface 105133 and a second curved surface 105134. To enable the first connecting member 10513 to rotate relative to the first raised surface 101211 and the groove surface 101121 of the second curved groove, the first curved surface 105133 and the second curved surface 105134 may be arcuate surfaces, with the center of the first curved surface 105133 coinciding with the center of the second curved surface 105134. The radii of the first curved surface 105133 and the second curved surface 105134 may be equal or different, and are not limited thereto in the present application. In addition, considering the design tolerance, the first arc surface 105133 and the second arc surface 105134 can also be arc surfaces of other possible shapes such as elliptical arc surfaces, as long as the first connecting member 10513 can be rotated relative to the first raised surface 101211 and the groove surface 101121 of the second arc groove.

[0096] 12 and 13 , when the electronic device is in the expanded state as shown in FIG12 and the closed state as shown in FIG13 , the first curved surface 105133 of the first connecting member 10513 can abut against the surface 101211 of the first protrusion, and the second curved surface 105134 abuts against the groove surface 101121 of the second curved groove, so that the surface 101211 of the first protrusion and the groove surface 101121 of the second curved groove limit the first connecting member 10513 to the second track groove 1013, so that when the hinge mechanism 1 is in the expanded state and the closed state, the position of the first connecting member 10513 is relatively stable and no virtual shaking occurs, thereby improving the reliability of the hinge mechanism 1 in the above two states.

[0097] In this application, when the electronic device is in the expanded state as shown in FIG12 , the distance between the point where the first protruding surface 101211 contacts the first curved surface 105133 and the point where the groove surface 101121 of the second curved groove contacts the second curved surface 105134 is denoted as d1. When the electronic device is in the closed state as shown in FIG13 , the distance between the point where the first protruding surface 101211 contacts the first curved surface 105133 and the point where the groove surface 101121 of the second curved groove contacts the second curved surface 105134 is denoted as d2. Since the first curved surface 105133 of the first connecting member 10513 can abut against the surface 101211 of the first protrusion when the electronic device is in the expanded state and the closed state, and the second curved surface 105134 abuts against the groove surface 101121 of the second curved groove, when the first curved surface 105133 and the second curved surface 105134 are both circular arc surfaces, it can be concluded that d1=d2.

[0098] In the present application, the specific configuration of the first protruding surface 101211 and the groove surface 101121 of the second arcuate groove is not limited. For example, the first protruding surface 101211 can be a circular arc surface, and the groove surface 101121 of the second arcuate groove can be a circular arc surface. In addition, the center of the first protruding surface 101211 coincides with the center of the groove surface 101121 of the second arcuate groove. In some other possible embodiments of the present application, the first protruding surface 101211 and the groove surface 101121 of the second arcuate groove can also be set as planes, so that the second track groove 1013 is a straight groove; or the first protruding surface 101211 and the groove surface 101121 of the second arcuate groove can also be curved surfaces of other shapes, so that the second track groove 1013 is a curved groove of any shape, which should be understood to fall within the scope of protection of the present application.

[0099] Continuing with FIG. 12 , in the present application, the spacing between the first raised surface 101211 and the second arcuate groove surface 101121 can be made equal at all locations, so that the second trajectory groove 1013 is a uniformly wide groove. In this case, during the electronic device's transition from an expanded state to a closed state, and vice versa, the first raised surface 101211 and the first arcuate surface 105133, as well as the second arcuate groove surface 101121 and the second arcuate surface 105134, are always in contact. This ensures that the motion trajectory of the first connecting member 10513 remains consistent during the transition from the expanded state to the closed state, and vice versa. This helps improve the stability of the movement of the first connecting member 10513, thereby enhancing the stability of the movement of the first rotating assembly 10511.

[0100] Referring to Figure 15 , Figure 15 is a schematic diagram of the assembly structure of the first connecting member 10513 and the main shaft 101 provided in an embodiment of the present application. In the present application, when the second track groove 1013 is a groove of equal width, and the first curved surface 105133 and the second curved surface 105134 are circular arc surfaces, the sum of the radius R1 of the first curved surface 105133 and the radius R2 of the second curved surface 105134 is equal to the distance D between the first raised surface 101211 and the groove surface 101121 of the second curved groove. In addition, considering the smooth movement of the first connecting member 10513 within the second track groove 1013, a certain design gap can be retained between the first curved surface 105133 and the first raised surface 101211, and / or between the second curved surface 105134 and the groove surface 101121 of the second curved groove.

[0101] In other possible embodiments of the present application, the motion trajectory of the first connector 10513 during the electronic device's transition from an expanded state to a closed state can be different from the motion trajectory of the first connector 10513 during the transition from a closed state to an expanded state. Specifically, during the transition from the expanded state to the closed state, the first curved surface 105133 abuts the first raised surface 101211, and a gap exists between the second curved surface 105134 and the groove surface 101121 of the second curved groove. Furthermore, during the transition from the expanded state to the closed state, the second curved surface 105134 abuts the groove surface 101121 of the second curved groove, and a gap exists between the first curved surface 105133 and the first raised surface 101211. In this embodiment, the distance between the first raised surface 101211 and the groove surface 101121 of the second curved groove can vary, so that the second trajectory groove 1013 can be a non-uniform width groove.

[0102] As can be seen from the above description, in the present application, the first swing arm 10511 can be rotatably connected to the main shaft 101, wherein the first swing arm 10511 and the main shaft 101 can be rotatably connected by means of a virtual axis. This can help reduce the space occupied by the first swing arm 10511 on the main shaft 101, thereby helping to reduce the volume of the rotating module 105, so as to facilitate the miniaturization of the hinge mechanism 1. In addition, it can be understood that for an outward-folding electronic device, when the first swing arm 10511 is rotatably connected to the main shaft 101 by means of a virtual axis, the axis of rotation of the first swing arm 10511 around the main shaft 101 is located on the side of the main shaft 101 facing away from the flexible display screen.

[0103] As shown in FIG16 , FIG16 is a CC cross-sectional view of the rotating shaft mechanism 1 shown in FIG3 . A second arcuate rotating block 105111 may be provided at the end of the first swing arm 10511 facing the base 1011. Furthermore, referring to FIG7 , the base 1011 may be provided with a third arcuate groove 10113. The second arcuate rotating block 105111 may be accommodated in the third arcuate groove 10113 and may slide along the groove surface of the third arcuate groove 10113, thereby enabling the first swing arm 105111 to rotate about the main shaft 101 by sliding the second arcuate rotating block 105111 along the groove surface of the third arcuate groove 10113. Furthermore, in the present application, the second arcuate rotating block 105111 may be, but is not limited to, a circular arcuate rotating block, and the third arcuate groove 10113 may be, but is not limited to, a circular arcuate groove. It can be understood that when the second arc-shaped rotating block 105111 is a circular arc-shaped rotating block, its surface for contacting the groove surface of the third arc-shaped groove 10113 can be a circular arc surface, and the groove surface of the third arc-shaped groove 10113 is also a circular arc surface, and the centers of the two circular arc surfaces coincide.

[0104] Referring to Figures 12 and 16 together, the cover 1012 may include a second protrusion 10122 arranged toward the third arc groove 10113, at least part of the second arc rotating block 105111 is located between the second protrusion 10122 and the third arc groove 10113, and the second arc rotating block 105111 can contact the surface 101221 of the second protrusion, so that the second arc rotating block 105111 can be limited between the cover 1012 and the base 1011, which can effectively improve the stability of the second arc rotating block 105111 relative to the base 1011.

[0105] It is worth noting that when the groove surface of the third arc-shaped groove 10113 is an arc surface, the portion of the second protrusion surface 101221 that contacts the second arc-shaped rotating block 105111 can also be an arc surface, with the centers of the two arc surfaces coinciding. Furthermore, the surface of the second arc-shaped rotating block 105111 that faces the second protrusion 10122 can be either a flat surface or an arc surface, as long as the second arc-shaped rotating block 105111 can rotate relative to the second protrusion 10122.

[0106] Reference may be made to Figure 17, which is a cross-sectional view of the hinge mechanism 1 provided in an embodiment of the present application at the first swing arm 10511 when the electronic device is in a closed state. In the present application, the second arcuate rotating block 105111 may also be provided with a first recessed portion 1051111, with the opening of the first recessed portion 1051111 facing the cover plate 1012. Furthermore, the end of the cover plate 1012 facing the first swing arm 105111 may be provided with a first plug-in portion 10123. In this closed state, the first plug-in portion 10123 may be inserted into the first recessed portion 1051111, and the surface of the first plug-in portion 10123 facing the third arcuate groove 10113 abuts against at least a portion of the surface of the first recessed portion 1051111. In this way, the rotation position of the second arc-shaped rotating block 105111 can be limited, and the second arc-shaped rotating block 105111 can be prevented from escaping from the third arc-shaped groove 10113, thereby improving the reliability of the connection between the first swing arm 10511 and the main shaft 101, and improving the structural reliability of the entire rotating shaft mechanism 1.

[0107] It is worth mentioning that, in the present application, in addition to being rotatably connected to the main shaft 101 via a virtual shaft, the first swing arm 10511 can also be rotatably connected via a solid shaft, which can make the connection between the first swing arm 10511 and the main shaft 101 more reliable. It is understandable that when the first swing arm 10511 is rotatably connected to the main shaft 101 via a solid shaft, the axis of rotation of the first swing arm 10511 around the main shaft 101 is also located on the side of the main shaft 101 facing away from the flexible display screen.

[0108] In the present application, when the first swing arm 10511 is rotatably connected to the first connecting member 10513, reference can be continued to Figure 14. The first connecting member 10513 may include a first rotating shaft 105131 and a second rotating shaft 105132. The axis of the first rotating shaft 105131 is parallel to the axis of the second rotating shaft 105132 and does not overlap.

[0109] In addition, referring to Figure 18, Figure 18 is a schematic structural diagram of the first rotating assembly 1051 provided in an embodiment of the present application. The first connecting member 10513 is rotationally connected to the first swing arm 10511 via a first rotating shaft 105131, and the first connecting member 10513 is rotationally connected to the first support arm 10512 via a second rotating shaft 105132. This allows the first swing arm 10511 and the first support arm 10512 to engage in mutual pulling motion via the first connecting member 10513.

[0110] Referring to FIG. 19 , FIG. 19 is a schematic structural diagram of a first swing arm 10511 provided in an embodiment of the present application. The second arc-shaped rotating block 105111 is provided with a first mounting groove 1051112. Referring to FIG. 16 and FIG. 19 , the notch of the first mounting groove 1051112 is disposed toward the third arc-shaped groove 10113. Thus, the first rotating shaft 105131 can be mounted in the first mounting groove 1051112. A portion of the surface of the first rotating shaft 105131 can contact the groove surface of the first mounting groove 1051112, and a portion of the surface of the first rotating shaft 105131 can contact the groove surface of the third arc-shaped groove 10113, thereby confining the first rotating shaft 105131 in the first mounting groove 1051112.

[0111] Continuing with reference to Figures 16 and 19 , the groove surface of the first mounting groove 1051112 may include a first arcuate surface 10511121, while the surface of the first rotating shaft 105131 that contacts the groove surface of the first mounting groove 1051112 is a second arcuate surface 1051311, with the center of the first arcuate surface 10511121 coinciding with the center of the second arcuate surface 1051311. Furthermore, referring to Figure 7 , the groove surface of the third arcuate groove 10113 may be a third arcuate surface 101131. As shown in Figure 16 , the surface of the first rotating shaft 105131 that contacts the groove surface of the third arcuate groove 10113 may be a fourth arcuate surface 1051312, with the center of the third arcuate surface 101131 coinciding with the center of the fourth arcuate surface 1051312. In this way, referring to Figures 16 and 17 together, while the first rotating shaft 105131 slides along the groove surface of the third arc-shaped groove 10113 with the second arc-shaped rotating block 105111, the first rotating shaft 105131 can also be rotated relative to the second arc-shaped rotating block 105111, thereby facilitating the movement of the first connecting member 10513 relative to the main shaft 101.

[0112] In the present application, when the first connecting member 10513 is rotatably connected to the first support arm 10512, as shown in Figure 18, the second rotating shaft 105132 can be simultaneously provided through the first connecting member 10513 and the first support arm 10512. This simplifies the connection between the first connecting member 10513 and the first support arm 10512, which helps simplify the structure of the first rotating assembly 1051, thereby simplifying the structure of the rotating shaft mechanism 1. It is worth mentioning that when the first curved surface 105133 and the second curved surface 105134 of the first connecting member 10513 are both circular arc surfaces, the center of the first curved surface 105133, the center of the second curved surface 105134, and the axis of the second rotating shaft 105132 coincide with each other.

[0113] It is understood that in the rotating shaft mechanism 1 provided in the embodiment of the present application, the first connecting member 10513 may include a plurality of first sub-connecting members that are rotatably connected in sequence. In addition, the plurality of first sub-connecting members may be located between the first swing arm 10511 and the first support arm 10512, so that the first swing arm 10511 can be rotatably connected to adjacent first sub-connecting members, and the first support arm 10512 can be rotatably connected to adjacent first sub-connecting members. The specific configuration can be made with reference to the above description of the rotatable connection between the first swing arm 10511 and the first support arm 10512 and the first connecting member 10513, and will not be repeated here. In the present application, by setting the first connecting member 10513 as a plurality of first sub-connecting members that are connected in sequence and rotated, so that the first swing arm 10511 and the first support arm 10512 are connected through a plurality of first sub-connecting members, the speed uniformity of the first swing arm 10511 and the first support arm 10512 during the rotation process around the main axis 101 can be effectively improved, thereby improving the smoothness of the mutual pulling movement of the first swing arm 10511 and the first support arm 10512.

[0114] Continuing with FIG. 4 , in the present application, the first swing arm 10511 can also be slidably connected to the first housing mounting bracket 103. Specifically, the first housing mounting bracket 103 is provided with a second slide groove 1033. The second slide groove 1033 extends along a first direction, and the first swing arm 10511 can be mounted in the second slide groove 1033 and slide within the second slide groove 1033 in the first direction. The first direction can be the direction in which the first housing mounting bracket 103 moves toward or away from the base 1011. Furthermore, to prevent the first swing arm 10511 from falling out of the second slide groove 1033, a second slideway can be provided on the wall of the second slide groove 1033, and a second slider can be provided on the first swing arm 10511. In this way, the second slider can be engaged with the second slideway and slide along the second slideway, thereby limiting the position of the first swing arm 10511 within the second slide groove 1033. In addition, by arranging a second slideway on the groove wall of the second slide groove 1033, it can provide guidance for the sliding of the first swing arm 10511 along the second slide groove 1033, thereby improving the stability of the movement of the first swing arm 10511.

[0115] In the present application, the first support arm 10512 can be rotatably connected to the second housing fixing frame 104. In a specific implementation, referring to Figure 4, the second housing fixing frame 104 has a second mounting portion 1042. The end of the first support arm 10512 facing the second housing fixing frame 104 is mounted on the second mounting portion 1042, and the end of the first support arm 10512 facing the second housing fixing frame 104 is rotatably connected to the second mounting portion 1042.

[0116] In the embodiment of the present application, the specific manner in which the end portion of the first support arm 10512 facing the second housing fixing frame 104 is rotatably connected to the second mounting portion 1042 is not limited. For example, with continued reference to FIG. 4 , the second mounting portion 1042 may be provided with a first mounting hole, while the end portion of the first support arm 10512 facing the second housing fixing frame 104 is provided with a second mounting hole. In this manner, the end portion of the first support arm 10512 facing the first housing fixing frame 103 may be rotatably connected to the second mounting portion 1042 via a rotating shaft that extends through both the first mounting hole and the second mounting hole.

[0117] Referring to Figure 20, Figure 20 is a schematic diagram of the motion mechanism of the hinge mechanism 1 provided in an embodiment of the present application. Based on the hinge mechanism 1 provided in the above embodiment of the present application, when the electronic device moves from an expanded state to a closed state, the first housing mounting frame 103 and the second housing mounting frame 104 move toward each other. When the first housing mounting frame 103 drives the first swing arm 10511 to rotate clockwise around the main shaft 101, the first swing arm 10511 can slide along the groove surface of the third arc-shaped groove 10113, thereby driving the first connecting member 10513 to move toward the first swing arm 10511 within the second track groove 1013 of the main shaft 101. Because the first connecting member 10513 is rotationally connected to the first support arm 10512, the first connecting member 10513 can drive the first support arm 10512 to rotate counterclockwise around the main shaft 101 during the process of moving toward the first swing arm 10511 in the second track groove 101 of the main shaft 101, thereby driving the second shell fixing frame 104 to rotate counterclockwise around the main shaft 101 through the first support arm 10512. When the electronic device moves from the closed state to the unfolded state, the first housing fixing frame 103 and the second housing fixing frame 104 move in opposite directions. When the first housing fixing frame 103 drives the first swing arm 10511 to rotate counterclockwise around the main axis 101, the first swing arm 10511 can drive the first connecting member 10513 to move toward the first support arm 10512 within the second track groove 1013 of the main axis 101, thereby driving the first support arm 10512 to rotate clockwise around the main axis 101. The second housing fixing frame 104 can then be driven to rotate clockwise around the main axis 101 via the first support arm 10512. This achieves the folding and unfolding functions of the hinge mechanism 1.

[0118] In order to ensure the stability of some existing hinge mechanisms, it is necessary to increase the thickness of the rotating assembly connected to the main shaft, which will make the main shaft and the hinge mechanism very thick. If the thickness is forcibly reduced, the strength of the rotating assembly will be easily weakened, which will greatly affect the reliability of the hinge mechanism and thus reduce the life of the electronic device. The above-mentioned hinge mechanism 1 of the present application has a streamlined structure. Through the above-mentioned structural relationship, the cross-section of the first connecting member 10513 can be made smaller to shuttle through the second track groove 1013 of the main shaft 101. At the same time, because the first connecting member 10513 has a sufficient length to extend in the vertical axial direction and is connected to the first swing arm 10511 and the first support arm 10512 respectively, the reliability of the hinge mechanism 1 can be guaranteed. In this way, the effect of reducing the thickness of the main shaft 101 and the thickness of the entire machine can be achieved while maintaining the reliability of the hinge mechanism 1, making the entire hinge mechanism 1 light, thin and reliable.

[0119] Furthermore, since the first connecting member 10513 can move along a predetermined trajectory within the second trajectory groove 1013, uncontrolled movement of the first connecting member 10513 during the entire folding and unfolding process can be avoided, thereby preventing random movement of the first shell fixing frame 103 and the second shell fixing frame 104, thereby ensuring the structural and motion stability of the entire hinge mechanism 1. In some cases, by rationally designing the second trajectory groove 1013, the outer tangent of the hinge mechanism 1 can also maintain a constant length throughout the entire folding and unfolding process, thereby allowing the flexible display covering the surface of the hinge mechanism 1 to maintain a substantially constant length. This effectively prevents squeezing or pulling of the flexible display, thereby improving the structural reliability of the flexible display, and thereby improving the structural reliability of the electronic device.

[0120] Continuing with FIG. 4 , similar to the structure of the first rotating assembly 1051, when the second rotating assembly 1052 is specifically configured, the second rotating assembly 1052 is located between the first housing fixing frame 103 and the second housing fixing frame 104. Furthermore, the second rotating assembly 1052 may include a second swing arm 10521, a second support arm 10522, and a second connecting member 10523. The second connecting member 10523 is located between the second swing arm 10521 and the second support arm 10522, and is rotationally connected to the second swing arm 10521. The second connecting member 10523 is also rotationally connected to the second support arm 10522. In the present application, when the second connecting member 10523 is rotationally connected to the second swing arm 10521 and the first support arm 10512, the configuration may be similar to the above-described configuration of the first connecting member 10513 rotationally connected to the second swing arm 10521 and the second support arm 10522. For example, reference may be made to FIG14 , which may also be used to illustrate the structure of the second connecting member 10523 provided in an embodiment of the present application. The second connecting member 10523 may include a third rotating shaft 105231 and a fourth rotating shaft 105232, wherein the axis of the third rotating shaft 105231 is parallel to and does not overlap with the axis of the fourth rotating shaft 105232. The second connecting member 10523 and the second swing arm 10521 may be rotatably connected via the third rotating shaft 105231, and the second connecting member 10523 and the second support arm 10522 may be rotatably connected via the fourth rotating shaft 105232, thereby allowing the second swing arm 10521 and the second support arm 10522 to perform a pulling motion with each other via the second connecting member 10523.

[0121] In addition, referring to FIG11 , the spindle 101 may be provided with a third trajectory groove 1014, along which the second connecting member 10523 can move, thereby limiting the movement trajectory of the second connecting member 10523. Specifically, referring to FIG7 , the base 1011 may be provided with a fourth arcuate groove 10114, in which the second connecting member 10523 is accommodated and can slide along the groove surface of the fourth arcuate groove 10114. Furthermore, referring to FIG12 , the cover 1012 includes a third protrusion 10124, which may be positioned toward the fourth arcuate groove 10114 of the base 1011 in FIG7 . A gap is formed between the surface of the third protrusion 10124 and the groove surface of the fourth arcuate groove 10114, serving as the third trajectory groove 1014.

[0122] In the present application, as shown in FIG14 , the second connecting member 10523 may include a third curved surface 105233 and a fourth curved surface 105234. When the electronic device is in the expanded state and the closed state, the third curved surface 105233 of the second connecting member 10523 may abut against the surface 101241 of the third protrusion, and the fourth curved surface 105234 may abut against the groove surface of the fourth curved groove 10114. As a result, the surface 101241 of the third protrusion and the groove surface of the fourth curved groove 10114 restrict the second connecting member 10523 to the third track groove 1014. This ensures that the position of the second connecting member 10523 is relatively stable in the expanded state and the closed state of the hinge mechanism 1, without any virtual position shaking, thereby improving the structural reliability of the hinge mechanism 1 in the above two states.

[0123] In the embodiment of the present application, the third curved surface 105233 of the second connecting member 10523 can be configured with reference to the first curved surface 105133 of the first connecting member 10513, and the fourth curved surface 105234 can be configured with reference to the second curved surface 105134 of the first connecting member 10513, which will not be described in detail herein. Furthermore, the third track groove 1014 can be configured with reference to the second track groove 1013. In short, the spacing between the third raised surface 101241 and the groove surface of the fourth curved groove 10114 is equal at all locations, so that the third track groove 1014 is a groove of uniform width. In this case, during the process of the electronic device moving from the expanded state to the closed state, and vice versa, the third raised surface 101241 and the third curved surface 105233, as well as the groove surface of the fourth curved groove 10114 and the fourth curved surface 105234, are always in contact. Thus, when the electronic device moves from the expanded state to the closed state and from the closed state to the expanded state, the movement trajectory of the second connecting member 10523 within the third trajectory groove 1014 is the same. Alternatively, when the electronic device moves from the expanded state to the closed state, the third curved surface 105233 abuts against the third raised surface 101241, and a gap exists between the fourth curved surface 105234 and the groove surface of the fourth curved groove 10114. When the electronic device moves from the closed state to the expanded state, the fourth curved surface 105234 abuts against the groove surface of the fourth curved groove 10114, and a gap exists between the third curved surface 105233 and the third raised surface 101241. This ensures that the movement trajectory of the second connecting member 10523 when the electronic device moves from the expanded state to the closed state is different from the movement trajectory of the second connecting member 10523 when the electronic device moves from the closed state to the expanded state.

[0124] In the present application, the second swing arm 10521 is rotatably connected to the main shaft 101. The second swing arm 10521 and the main shaft 101 can be rotatably connected via a virtual axis. In a specific implementation, as shown in FIG7 , the base 1011 can be provided with a fifth arcuate groove 10115. In addition, referring to FIG4 and FIG19 , FIG19 can also be used to illustrate the structure of the second swing arm 10521. A third arcuate rotating block 105211 is provided at one end of the second swing arm 10521 facing the base 1011. The third arcuate rotating block 105211 can be, but is not limited to, a circular arcuate rotating block, and the fifth arcuate groove 10115 can be, but is not limited to, a circular arcuate groove. The third arc-shaped rotating block 105211 can be accommodated in the fifth arc-shaped groove 10115 and can slide along the groove surface 101151 of the fifth arc-shaped groove. This sliding of the third arc-shaped rotating block 105211 along the groove surface 101151 of the fifth arc-shaped groove enables the second swing arm 10521 to rotate about the base 1011. This can help reduce the space occupied by the second swing arm 10521 on the main shaft 101, thereby reducing the volume of the rotating module 105 and facilitating a miniaturized design of the hinge mechanism 1. It will be appreciated that for an outward-folding electronic device, when the second swing arm 10521 is rotationally connected to the main shaft 101 via a virtual axis, the axis of rotation of the second swing arm 10521 about the main shaft 101 is located on the side of the hinge mechanism 1 facing away from the flexible display screen.

[0125] Furthermore, in the present application, the third arc-shaped rotating block 105211 may be, but is not limited to, a circular arc-shaped rotating block, and the fifth arc-shaped groove 10115 may be, but is not limited to, a circular arc-shaped groove. It is understood that when the third arc-shaped rotating block 105211 is a circular arc-shaped rotating block, its surface that contacts the groove surface 101151 of the fifth arc-shaped groove may be a circular arc surface, and the groove surface 101151 of the fifth arc-shaped groove may also be a circular arc surface, with the centers of the two circular arc surfaces coinciding.

[0126] In the present application, in order to improve the stability of the second swing arm 10521 rotating about the main axis 101, as shown in FIG12 , the cover plate 1012 further includes a fourth protrusion 10125 disposed toward the fifth arcuate groove 10115. At least a portion of the third arcuate rotating block 105211 is located between the fourth protrusion 10125 and the fifth arcuate groove 10115, and the surface of the third arcuate rotating block 105211 facing the fourth protrusion 10125 can contact the surface 101251 of the fourth protrusion, thereby confining the third arcuate rotating block 105211 between the cover plate 1012 and the base 1011, which can effectively improve the stability of the third arcuate rotating block 105211 rotating relative to the base 1011. Furthermore, when the groove surface 101151 of the fifth arcuate groove is an arcuate surface, the portion of the surface 101251 of the fourth protrusion that contacts the third arcuate rotating block 105211 may also be an arcuate surface, with the centers of the two arcuate surfaces coinciding. In the present application, the surface of the third arcuate rotating block 105211 facing the fourth protrusion 10125 may be a flat surface or an arcuate surface, as long as the third arcuate rotating block 105211 can rotate relative to the fourth protrusion 10125 while sliding along the groove surface 101151 of the fifth arcuate groove.

[0127] To enhance the reliability of the connection between the second swing arm 10521 and the base 1011, the third arcuate rotating block 105211 may also be provided with a second recessed portion 1052111, the opening of which faces the cover plate 1012. Furthermore, the end of the cover plate 1012 facing the second housing fixing frame 104 may be provided with a second plug-in portion (not shown in FIG. 4 ). In the closed position, the second plug-in portion can be inserted into the second recessed portion 1052111, with the surface of the second plug-in portion facing the fifth arcuate slot 10115 abutting at least partially against the surface of the second recessed portion 1052111. This limits the rotational position of the third arcuate rotating block 105211, thereby preventing the third arcuate rotating block 105211 from dislodging from the fifth arcuate slot 10115.

[0128] It's worth noting that, in this application, in addition to being rotatably connected to the main shaft 101 via a virtual shaft, the second swing arm 10521 can also be rotatably connected via a solid shaft, which provides a more reliable connection between the first swing arm 10511 and the main shaft 101. For outward-folding electronic devices, when the first swing arm 10511 is rotatably connected to the main shaft 101 via a solid shaft, the axis of rotation of the first swing arm 10511 around the main shaft 101 is also located on the side of the hinge mechanism facing away from the flexible display.

[0129] When the second connecting member 10523 is rotatably connected to the second swing arm 10521 through the third rotating shaft 105231, reference can be continued to Figure 19. The third arc-shaped rotating block 105211 is provided with a second mounting groove 1052112, and the slot of the second mounting groove 1052112 is set toward the fourth arc-shaped groove 10114. Then the third rotating shaft 105231 can be installed in the second mounting groove 1052112, and part of the surface of the third rotating shaft 105231 can contact the slot surface of the second mounting groove 1052112, and part of the surface of the third rotating shaft 105231 is in contact with the slot surface of the fourth arc-shaped groove 10114, so as to limit the third rotating shaft 105231 to the second mounting groove 1052112.

[0130] As shown in FIG19 , in the present application, the groove surface of the second mounting groove 1052112 may include a fifth arcuate surface 10521121, and as shown in FIG14 , the surface of the third rotating shaft 105231 that contacts the groove surface of the second mounting groove 1052112 is a sixth arcuate surface 1052311, and the center of the fifth arcuate surface 10521121 coincides with the center of the sixth arcuate surface 1052311. Furthermore, the groove surface of the fourth arcuate groove 10114 is a seventh arcuate surface 101141, and the surface of the third rotating shaft 105231 that contacts the groove surface of the fourth arcuate groove 10114 may be an eighth arcuate surface 1052312, and the center of the seventh arcuate surface 101141 coincides with the center of the eighth arcuate surface 1052312. In this way, while the third rotating shaft 105231 slides along the groove surface of the fourth arc groove 10114 with the second arc-shaped rotating block 105111, the third rotating shaft 105231 can also be rotated relative to the third arc-shaped rotating block 105211, thereby facilitating the movement of the second connecting member 10523 relative to the main shaft 101.

[0131] In the embodiment of the present application, when the second connecting member 10523 and the second support arm 10522 are rotatably connected through the fourth rotating shaft 105232, the fourth rotating shaft 105232 can be simultaneously passed through the second connecting member 10523 and the second support arm 10522. Then, the connection method between the second connecting member 10523 and the second support arm 10522 is relatively simple, which is conducive to simplifying the structure of the second rotating component 1052, thereby simplifying the structure of the rotating shaft mechanism 1.

[0132] It is understood that in the rotating shaft mechanism 1 provided in the embodiment of the present application, the second connecting member 10523 may include a plurality of second sub-connecting members that are rotatably connected in sequence. In addition, the plurality of second sub-connecting members may be located between the second swing arm 10521 and the second support arm 10522, so that the second swing arm 10521 can be rotatably connected to the adjacent second sub-connecting member, and the second support arm 10522 can be rotatably connected to the adjacent second sub-connecting member. The manner in which the second swing arm 10521 is rotatably connected to the adjacent second sub-connecting member, and the manner in which the second support arm 10522 is rotatably connected to the adjacent second sub-connecting member, can be specifically set with reference to the above description of the rotatable connection between the second swing arm 10521 and the second support arm 10522 and the second connecting member 10523, and will not be described in detail here. In the present application, by setting the second connecting member 10523 as a plurality of second sub-connecting members connected in rotation in sequence, so that the second swing arm 10521 and the second support arm 10522 are rotationally connected through the plurality of second connecting members 10523, the speed uniformity of the second swing arm 10521 and the second support arm 10522 during the rotation around the main axis 101 can be effectively improved, thereby improving the smoothness of the mutual pulling movement of the second swing arm 10521 and the second support arm 10522.

[0133] In the present application, the second swing arm 10521 can be slidably connected to the second housing mounting bracket 104. Specifically, the second housing mounting bracket 104 is provided with a third slide groove 1043, which is spaced apart from the second mounting portion 1042 along the length of the rotating shaft mechanism 1. The third slide groove 1043 extends along a second direction, and the second swing arm 10521 can be mounted in the third slide groove 1043 and slide within the third slide groove 1043 in the second direction. The second direction can be the direction in which the second housing mounting bracket 104 moves toward or away from the base 1011. Furthermore, to prevent the second swing arm 10521 from falling out of the third slide groove 1043, a third slideway can be provided on the wall of the third slide groove 1043, and a third slider can be provided on the second swing arm 10521. In this way, the third slider can be locked in the third slideway and slide along the third slideway to limit the position of the second swing arm 10521 in the third slide groove 1043. In addition, by providing the third slideway on the groove wall of the third slide groove 1043, it can provide a guide for the second swing arm 10521 to slide along the third slide groove 1043, thereby improving the stability of the movement of the second swing arm 10521.

[0134] In addition, the second support arm 10522 can be rotatably connected to the first housing fixing frame 103. In a specific embodiment, the first housing fixing frame 103 has a first mounting portion 1032, which is spaced apart from the second slide groove 1033 along the length of the rotating shaft mechanism 1. The end of the second support arm 10522 facing the first housing fixing frame 103 is mounted on the first mounting portion 1032, and the end of the second support arm 10522 facing the first housing fixing frame 103 is rotatably connected to the first mounting portion 1032.

[0135] In the embodiment of the present application, the specific manner in which the end portion of the second support arm 10522 facing the first housing fixing frame 103 is rotatably connected to the first mounting portion 1032 is not limited. For example, with continued reference to FIG. 4 , the first mounting portion 1032 may be provided with a third mounting hole, while the end portion of the second support arm 10522 facing the first housing fixing frame 103 is provided with a fourth mounting hole. In this case, the end portion of the second support arm 10522 facing the first housing fixing frame 103 may be rotatably connected to the first mounting portion 1032 via a rotating shaft that extends through both the third mounting hole and the fourth mounting hole.

[0136] Based on the hinge mechanism 1 provided by the above-described embodiment of the present application, when the electronic device moves from an open state to a closed state, the first housing fixing frame 103 and the second housing fixing frame 104 move toward each other. When the second housing fixing frame 104 drives the second swing arm 10521 to rotate counterclockwise around the main shaft 101, the second swing arm 10521 can drive the second connecting member 10523 to move toward the second swing arm 10521 within the third track groove 1014 of the main shaft 101. Because the second connecting member 10523 is rotationally connected to the second support arm 10522, when the second connecting member 10523 moves toward the second swing arm 10521 within the third track groove 1014 of the main shaft 101, it can drive the second support arm 10522 to rotate clockwise around the main shaft 101, thereby driving the first housing fixing frame 103 to rotate clockwise around the main shaft 101 through the second support arm 10522. When the electronic device moves from the closed state to the unfolded state, the first housing fixing frame 103 and the second housing fixing frame 104 move in opposite directions. When the second housing fixing frame 104 drives the second swing arm 10521 to rotate clockwise around the main shaft 101, the second swing arm 10521 can drive the second connecting member 10523 to move within the third track groove 1014 of the main shaft 101 toward the second support arm 10522, thereby driving the second support arm 10522 to rotate counterclockwise around the main shaft 101. The second support arm 10522 then drives the first housing fixing frame 103 to rotate counterclockwise around the main shaft 101, thereby achieving the folding and unfolding functions of the hinge mechanism 1.

[0137] In order to ensure the stability of some existing hinge mechanisms, it is necessary to increase the thickness of the rotating assembly connected to the main shaft, which will make the main shaft and the hinge mechanism very thick. If the thickness is forcibly reduced, the strength of the rotating assembly will be easily weakened, which will greatly affect the reliability of the hinge mechanism and thus reduce the life of the electronic device. The above-mentioned hinge mechanism 1 of the present application has a streamlined structure. Through the above-mentioned structural relationship, the cross-section of the second connecting member 10523 can be made smaller to shuttle through the third track groove 1014 of the main shaft 101. At the same time, because the second connecting member 10523 has a sufficient length to extend in the direction perpendicular to the axis and is connected to the second swing arm 10521 and the second support arm 10522 respectively, the reliability of the hinge mechanism 1 can be guaranteed. In this way, the thickness of the main shaft 101 and the thickness of the entire machine can be reduced while maintaining the reliability of the hinge mechanism 1, making the entire hinge mechanism 1 light, thin and reliable.

[0138] Since the second connecting member 10523 can move along a predetermined trajectory, it can prevent uncontrolled movement of the second connecting member 10523 during the entire folding and unfolding process, thereby preventing random movement of the first shell fixing frame 103 and the second shell fixing frame 104, thereby ensuring the structural and motion stability of the entire hinge mechanism 1. In some cases, through the reasonable design of the third trajectory groove 1014, the outer tangent of the hinge mechanism 1 can also maintain a constant length throughout the entire folding and unfolding process, thereby ensuring that the flexible display covering the surface of the hinge mechanism 1 can also maintain a substantially constant length. This effectively prevents squeezing or pulling on the flexible display, thereby improving the structural reliability of the flexible display, and thus improving the structural reliability of the electronic device.

[0139] Referring to Figure 21, Figure 21 is a schematic diagram of the partial structure of the rotating shaft mechanism 1 provided in an embodiment of the present application, and the main shaft 101 is omitted in Figure 21 to facilitate the description of the mutual pulling movement relationship between the first rotating component 1051 and the second rotating component 1052. In the present application, the first swing arm 10511 is slidably connected to the first shell fixing frame 103, and the first support arm 10512 is rotatably connected to the second shell fixing frame 104. The first swing arm 10511 can pull the first support arm 10512 to move along a set trajectory through the first connecting member 10513; the second swing arm 10521 is slidably connected to the second shell fixing frame 104, and the second support arm 10522 is rotatably connected to the first shell fixing frame 103. The second swing arm 10521 can pull the second support arm 10522 to move along a set trajectory through the second connecting member 10523. This limits the distances of movement of the first housing fixing frame 103 and the second housing fixing frame 104 toward or away from the main axis 101, ensuring that the distances between the first housing fixing frame 103 and the second housing fixing frame 104 and the main axis 101 are equal when the electronic device is in any folded state. Furthermore, the distances of movement of the first housing fixing frame 103 relative to the main axis 101 and the distances of movement of the second housing fixing frame 104 relative to the main axis 101 can be made equal when the electronic device moves from an unfolded state to a closed state, and vice versa. Consequently, when the hinge mechanism 1 is applied to an electronic device as shown in FIG. 2 b , the extended length of the support surface formed by the first housing 2, the second housing 3, and the hinge mechanism 1 in the unfolded state can be adapted to the flattened length of the flexible display. Furthermore, when the electronic device is in the closed state, the folding requirements of the foldable portion of the flexible display can be met, thereby preventing deformation of the flexible display and reducing the compression or tensile stress on the flexible display, thereby extending the service life of the flexible display and improving the reliability of the electronic device.

[0140] The rotating shaft mechanism 1 provided in the embodiment of the present application can realize its rotation function by pulling the connecting rods together, and can realize the synchronous rotation of the two housing fixing frames in the direction or opposite directions by setting the synchronization component 102. In addition, since the structures of the mechanism for realizing the rotation function and the mechanism for realizing the synchronization function of the rotating shaft mechanism 1 are relatively simple, it can effectively simplify the structure of the entire rotating shaft mechanism 1, thereby facilitating the miniaturization design of the rotating shaft mechanism 1 and reducing the cost of the rotating shaft mechanism 1. Furthermore, since the mechanism for realizing the rotation function and the mechanism for realizing the synchronization function of the rotating shaft mechanism 1 are two independent mechanisms, the failure of any one mechanism will not affect the realization of the function of the other mechanism, which can effectively improve the reliability of the rotating shaft mechanism 1.

[0141] It is worth mentioning that the synchronization component 102 introduced in the above embodiment of the present application can also be applied to the hinge mechanism 1 of an inward-folding electronic device. Referring to Figure 22, Figure 22 is a structural schematic diagram of the inward-folding electronic device provided in the embodiment of the present application when it is in a closed state. In the process of the electronic device changing from the unfolded state to the closed state, the synchronous rotation of the first shell 2 and the second shell 3 toward each other can drive the parts of the flexible display screen 4 fixedly connected to the two shells to rotate synchronously, which can make the force on various parts of the flexible display screen 4 more uniform, thereby effectively avoiding deformation of the flexible display screen 4, so as to reduce the risk of damage to the flexible display screen 4. When the electronic device is in a closed state, the hinge mechanism 1 can form a screen space 5 for accommodating the foldable part of the flexible display screen 4, which can avoid squeezing the foldable part of the flexible display screen 4, thereby improving the structural reliability of the flexible display screen 4.

[0142] In addition, when the electronic device moves from a closed state to an unfolded state, the first shell 2 and the second shell 3 rotate synchronously in opposite directions, which can drive the parts of the flexible display screen 4 that are fixedly connected to the two shells to rotate synchronously. When the electronic device is in the unfolded state, the bearing surface 1a of the hinge mechanism 1, the first supporting surface 2a of the first shell 2 and the second supporting surface 3a of the second shell 3 jointly play the role of flatly supporting the flexible display screen 4, thereby ensuring the integrity of the shape of the electronic device in the unfolded state.

[0143] It can be understood that for an inward-folding electronic device, when the first swing arm 10511 and the second swing arm 10521 are rotationally connected to the main shaft 101 through a virtual axis, the axis of rotation of the first swing arm 10511 and the second swing arm 10521 around the main shaft 101 is located on the side of the main shaft 101 facing the flexible display screen 4, so that when the electronic device is in a closed state, the flexible display screen 4 is located inside the electronic device.

[0144] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A hinge mechanism for a foldable electronic device, wherein the hinge mechanism is arranged opposite to a foldable portion of a flexible display screen of the electronic device, and the electronic device is unfolded or closed by the hinge mechanism, characterized in that: The rotating shaft mechanism comprises a main shaft, a synchronization component, a first housing fixing frame and a second housing fixing frame, wherein the first housing fixing frame and the second housing fixing frame are respectively arranged on opposite sides of the main shaft, and the synchronization component is located between the first housing fixing frame and the second housing fixing frame, wherein: The synchronization assembly includes a first connecting rod, a second connecting rod and a third connecting rod, the second connecting rod is located between the first connecting rod and the third connecting rod, the second connecting rod is rotatably connected to the first connecting rod, the second connecting rod is rotatably connected to the third connecting rod, the axis of the rotational connection between the second connecting rod and the first connecting rod and the axis of the rotational connection between the second connecting rod and the third connecting rod are parallel and do not overlap; the first connecting rod is rotatably connected to the main shaft, and the axis of the rotation of the first connecting rod around the main shaft and the axis of the rotational connection between the second connecting rod and the first connecting rod are parallel and do not overlap; the third connecting rod is rotatably connected to the main shaft, and the third connecting rod is slidably connected to the second housing fixing frame; The first housing fixing frame is provided with a first track groove, and the first connecting rod can slide along the first track groove to realize synchronous rotation of the first housing fixing frame and the second housing fixing frame relative to the main shaft toward or away from each other.

2. The rotating shaft mechanism according to claim 1, characterized in that: The main shaft includes a base, the base is provided with a first arc-shaped groove, the third connecting rod includes a first arc-shaped rotating block, the third arc-shaped rotating block is accommodated in the first arc-shaped groove, and the first arc-shaped rotating block can slide along the groove surface of the first arc-shaped groove.

3. The rotating shaft mechanism according to claim 2, characterized in that: The second connecting rod is rotatably connected to the first arc-shaped rotating block.

4. The rotating shaft mechanism according to any one of claims 1 to 3, characterized in that: The shaft mechanism further includes a rotating module, the rotating module includes a first rotating assembly and a second rotating assembly, the first rotating assembly is located between the first shell fixing frame and the second shell fixing frame, and the second rotating assembly is located between the first shell fixing frame and the second shell fixing frame; The first rotating assembly includes a first swing arm, a first support arm and a first connecting member, the first swing arm is rotatably connected to the main shaft, the first swing arm is slidably connected to the first housing fixing frame, the first support arm is rotatably connected to the second housing fixing frame, the first connecting member is located between the first swing arm and the first support arm, the first connecting member is rotatably connected to the first swing arm, and the first connecting member is rotatably connected to the first support arm; the main shaft is provided with a second track groove, the first connecting member can move along the second track groove to limit the movement track of the first connecting member; The second rotating assembly includes a second swing arm, a second support arm and a second connecting piece, the second swing arm is rotationally connected to the main shaft, the second swing arm is slidably connected to the second shell fixing frame, the second support arm is rotationally connected to the first shell fixing frame, the second connecting piece is located between the second swing arm and the second support arm, the second connecting piece is rotationally connected to the second swing arm, and the second connecting piece is rotationally connected to the second support arm; the main shaft is provided with a third track groove, the second connecting piece can move along the third track groove to limit the movement trajectory of the second connecting piece.

5. The rotating shaft mechanism according to claim 4, characterized in that: The main shaft includes a base and a cover plate, the base is provided with a second arc groove and a fourth arc groove; the cover plate is provided on the base, and the cover plate includes a first protrusion provided toward the second arc groove and a third protrusion provided toward the fourth arc groove; The gap between the surface of the first protrusion and the groove surface of the second arc-shaped groove serves as the second track groove, the first connecting member includes a first arc-shaped surface and a second arc-shaped surface, and when the electronic device is in an unfolded state and a closed state, the first arc-shaped surface abuts against the surface of the first protrusion, and the second arc-shaped surface abuts against the groove surface of the second arc-shaped groove; The gap between the surface of the third protrusion and the groove surface of the fourth arcuate groove serves as the third track groove, and the second connecting member includes a third arcuate surface and a fourth arcuate surface. When the electronic device is in an expanded state and a closed state, the third arcuate surface abuts against the surface of the third protrusion, and the fourth arcuate surface abuts against the groove surface of the fourth arcuate groove.

6. The rotating shaft mechanism according to claim 5, characterized in that: When the electronic device changes from the unfolded state to the closed state, the first arc surface abuts against the surface of the first protrusion, and there is a gap between the second arc surface and the groove surface of the second arc groove; when the electronic device changes from the closed state to the unfolded state, the second arc surface abuts against the groove surface of the second arc groove, and there is a gap between the first arc surface and the surface of the first protrusion; During the process of the electronic device changing from an expanded state to a closed state, the third arcuate surface abuts against the surface of the third protrusion, and there is a gap between the fourth arcuate surface and the groove surface of the fourth arcuate groove; during the process of the electronic device changing from a closed state to an expanded state, the fourth arcuate surface abuts against the groove surface of the fourth arcuate groove, and there is a gap between the third arcuate surface and the surface of the third protrusion.

7. The rotating shaft mechanism according to claim 5, characterized in that: The distances between the surface of the first protrusion and the groove surface of the second arc-shaped groove are equal at all locations, and when the electronic device changes from the unfolded state to the closed state and from the closed state to the unfolded state, the first arc-shaped surface abuts against the surface of the first protrusion, and the second arc-shaped surface abuts against the groove surface of the second arc-shaped groove; The distances between the surface of the third protrusion and the groove surface of the fourth arc-shaped groove are equal at all locations. When the electronic device changes from an expanded state to a closed state and from a closed state to an expanded state, the third arc-shaped surface abuts against the surface of the third protrusion, and the fourth arc-shaped surface abuts against the groove surface of the fourth arc-shaped groove.

8. The rotating shaft mechanism according to claim 5, characterized in that: The first arc surface is an arc surface, the second arc surface is an arc surface, and the sum of the radius of the first arc surface and the radius of the second arc surface is equal to the distance between the surface of the first protrusion and the groove surface of the second arc groove; The third arcuate surface is an arcuate surface, the fourth arcuate surface is an arcuate surface, and the sum of the radius of the third arcuate surface and the radius of the fourth arcuate surface is equal to the distance between the surface of the third protrusion and the groove surface of the fourth arcuate groove.

9. The rotating shaft mechanism according to any one of claims 4 to 8, characterized in that: The main shaft includes a base, the base is provided with a third arc groove and a fifth arc groove, the first swing arm includes a second arc rotation block, the second arc rotation block is accommodated in the third arc groove, and the second arc rotation block can slide along the groove surface of the third arc groove to realize the rotation connection between the first swing arm and the main shaft; The second swing arm includes a third arc-shaped rotating block, the third arc-shaped rotating block is accommodated in the fifth arc-shaped groove, and the second arc-shaped rotating block can slide along the groove surface of the fifth arc-shaped groove to realize the rotation connection between the second swing arm and the main shaft.

10. The rotating shaft mechanism according to claim 9, characterized in that: The main shaft further comprises a cover plate, the cover plate is covered on the base, the cover plate comprises a second protrusion arranged toward the third arc-shaped groove, and at least a part of the second arc-shaped rotating block is located between the second protrusion and the third arc-shaped groove; The cover plate further includes a fourth protrusion disposed toward the fifth arc-shaped groove, and at least a portion of the third arc-shaped rotating block is located between the fourth protrusion and the fifth arc-shaped groove.

11. The rotating shaft mechanism according to claim 9 or 10, characterized in that: The first connecting member includes a first rotating shaft and a second rotating shaft, the first connecting member and the first swing arm are rotatably connected via the first rotating shaft, the first connecting member and the first supporting arm are rotatably connected via the second rotating shaft, and the axis of the first rotating shaft is parallel to the axis of the second rotating shaft and does not overlap; The second connecting member includes a third rotating shaft and a fourth rotating shaft. The second connecting member and the second swing arm are rotationally connected via the third rotating shaft. The second connecting member and the second support arm are rotationally connected via the fourth rotating shaft. The axis of the third rotating shaft is parallel to and does not overlap with the axis of the fourth rotating shaft.

12. The rotating shaft mechanism according to claim 11, characterized in that: The second arc-shaped rotating block is provided with a first mounting groove, the notch of the first mounting groove is arranged toward the third arc-shaped groove, the first rotating shaft is installed in the first mounting groove, a part of the surface of the first rotating shaft contacts the groove surface of the first mounting groove, and a part of the surface of the first rotating shaft contacts the groove surface of the third arc-shaped groove; The third arc-shaped rotating block is provided with a second mounting groove, the groove opening of the second mounting groove is arranged toward the fifth arc-shaped groove, the third rotating shaft is installed in the second mounting groove, a part of the surface of the third rotating shaft contacts the groove surface of the second mounting groove, and a part of the surface of the third rotating shaft contacts the groove surface of the fifth arc-shaped groove.

13. The rotating shaft mechanism according to claim 12, characterized in that: The groove surface of the first installation groove includes a first arc surface, the surface of the first rotating shaft for contacting with the groove surface of the first installation groove is a second arc surface, and the center of the first arc surface coincides with the center of the second arc surface; The groove surface of the second installation groove includes a fifth arc surface, the surface of the third rotating shaft for contacting the groove surface of the second installation groove is a sixth arc surface, and the center of the fifth arc surface coincides with the center of the sixth arc surface.

14. The rotating shaft mechanism according to claim 13, characterized in that: The groove surface of the third arc groove is a third arc surface, the surface of the first rotating shaft for contacting with the groove surface of the third arc groove is a fourth arc surface, and the center of the third arc surface coincides with the center of the fourth arc surface; The groove surface of the fifth arc groove is the seventh arc surface, the surface of the third rotating shaft for contacting the groove surface of the fifth arc groove is the eighth arc surface, and the center of the seventh arc surface coincides with the center of the eighth arc surface.

15. The rotating shaft mechanism according to any one of claims 4 to 14, characterized in that: The axis center of rotation of the first swing arm around the main axis is located on the side of the main axis away from the flexible display screen; the axis center of rotation of the second swing arm around the main axis is located on the side of the main axis away from the flexible display screen.

16. The rotating shaft mechanism according to any one of claims 4 to 15, characterized in that: The first rotating assembly includes a plurality of first sub-connecting members that are rotatably connected in sequence; the plurality of first sub-connecting members are located between the first swing arm and the first support arm, the first swing arm is rotatably connected to adjacent first sub-connecting members, and the first support arm is rotatably connected to adjacent first sub-connecting members; The second rotating assembly includes a plurality of second sub-connecting members that are rotatably connected in sequence; the plurality of second sub-connecting members are located at the second swing arm and the second support arm, the second swing arm is rotatably connected to adjacent second sub-connecting members, and the second support arm is rotatably connected to adjacent second sub-connecting members.

17. An electronic device, characterized in that: The device comprises a first housing, a second housing, a flexible display screen, and a hinge mechanism as claimed in any one of claims 1 to 16, wherein: The first shell and the second shell are respectively arranged on opposite sides of the rotating shaft mechanism, the first shell fixing frame is fixedly connected to the first shell, and the second shell fixing frame is fixedly connected to the second shell; The flexible display screen continuously covers the first shell, the second shell and the hinge mechanism, and the flexible display screen is fixedly connected to the first shell and the second shell.

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