Hinge assembly and foldable electronic equipment

Abstract

The embodiment of the utility model provides a hinge assembly and foldable electronic equipment, and belongs to the technical field of electronic equipment, a rotating mechanism comprises a first door plate, at least one of a main shaft and the rotating mechanism comprises a matching piece, and the first door plate and the matching piece are in sliding fit through a first guide rail groove and a first guide rail piece; the sliding track of the first door plate relative to the mating part is determined by the extending track of the first guide rail groove. The first guide rail part of the first guide rail groove comprises a first bending section, namely, the extending direction or the groove body shape of the first guide rail groove is arc-shaped and bent. By adjusting the position of the first bending section on the first guide rail part, the groove shape of the first bending section and the like, the rotation track of the first door plate can be adjusted, and then the rotation speed of the first door plate relative to the main shaft is adjusted. In the process of switching from the flattened state to the small-angle middle state, the rotating speed of the first door plate is high, the first door plate can pull the flexible screen, the gap between the flexible screen and the main shaft is increased, and the problem of reverse arching of the flexible screen is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and in particular to a hinge assembly and a foldable electronic device. Background Art

[0002] As flexible screen technology matures, the display mode of electronic devices has undergone tremendous changes. One of them is the emergence of foldable mobile phones, computers and other electronic devices. Foldable electronic devices can flexibly switch modes according to different usage scenarios. At the same time, they also have a high screen-to-body ratio and clarity. For example, when the phone is folded, it can be only the size of a traditional mobile phone, which is convenient to carry, and when unfolded, it can have the display size of a tablet. These features make foldable devices one of the most popular products.

[0003] The foldable electronic device includes a flexible screen, a hinge assembly and at least two middle frames. The two middle frames are rotated together by the hinge assembly so that the two middle frames can rotate relative to each other. The flexible screen is arranged on the middle frame and the hinge assembly, and is bent or flattened as the two middle frames rotate, so that the electronic device can have a folded state, an intermediate state and a flattened state. The hinge assembly usually includes a main shaft and a rotating mechanism located on both sides of the main shaft. The rotating mechanism includes a first door panel, and the main shaft includes a second door panel. The first door panel and the second door panel can provide a relatively flat surface for the flexible display screen to form a better support. The flexible screen can be located on the inner side of the first door panel and the second door panel, and the first door panel can rotate relative to the second door panel. When the electronic device is in a flattened state, the first door panel and the second door panel are flattened, and the flexible screen is laid on the first door panel and the second door panel. When the electronic device switches from a flattened state to a folded state, the first door panel rotates relative to the second door panel, and the part of the flexible screen opposite to the hinge assembly is in a bent state.

[0004] However, for the above-mentioned foldable electronic device, when the electronic device is in an intermediate state of being bent at a small angle, the gap between the flexible screen and the second door plate of the main axis (the distance in the thickness direction of the electronic device) is small, causing the flexible screen to lift up and easily cause the flexible screen to arch back. Utility Model Content

[0005] The embodiments of the present application provide a hinge assembly and a foldable electronic device. When the hinge assembly and the electronic device are rotated to an intermediate state of small-angle bending, the gap between the flexible screen and the second door panel of the main axis can be increased to reduce the risk of the flexible screen arching.

[0006] A first aspect of an embodiment of the present application provides a hinge assembly, comprising a main shaft and two rotating mechanisms located on both sides of the main shaft, the two rotating mechanisms are respectively located on both sides of the main shaft, and the two rotating mechanisms are respectively rotatably connected to the main shaft, so that the hinge assembly can be switched between a flattened state and a closed state by rotating the rotating mechanism relative to the main shaft.

[0007] Each rotating mechanism includes a first door panel, and the main shaft and at least one of each rotating mechanism include a matching piece, wherein the matching piece can be a structural piece included in at least one of the main shaft and the rotating mechanism and can slide relative to the first door panel. A first guide rail groove is provided on one of the first door panel and the matching piece, and a first guide rail piece that can slide along the first guide rail groove is provided on the other of the first door panel and the matching piece, and the first door panel and the matching piece achieve sliding matching through the first guide rail groove and the first guide rail piece. The sliding trajectory of the first door panel relative to the matching piece is determined by the extension trajectory of the first guide rail groove (such as the extension direction, the shape of the groove body along the extension direction, etc.).

[0008] The first guide rail groove includes a first end, a first guide rail portion, and a second end. When the hinge assembly is in a flattened state, the first guide rail member is located at the first end, and when the hinge assembly is in a folded state, the first guide rail member is located at the second end. The first guide rail portion is located between the first end and the second end, and the first guide rail portion includes at least one arc-shaped first bending section. The first bending section means that the extension direction or the groove shape (the overall contour shape of the groove body in the extension direction) of this part of the first guide rail groove is not straight, but is curved and turned in an arc. That is, the groove body side wall of this part of the first guide rail groove is curved and turned.

[0009] The first bending section may include a first turning line, such as the first turning line of the first bending section at the turning position of the extension trend of one side wall of the first bending section, and the extension trend of the arc-shaped first bending section changes at the position of the first turning line. The end of the first bending section connected to the first end is the head end of the first bending section, and the end of the first bending section connected to the second end is the tail end of the first bending section. In the direction from the head end to the first turning line, the extension trend of the first bending section and the extension trend of the first bending section in the direction from the first turning line to the tail end change.

[0010] For example, if the swinging member of the rotating mechanism is used as a matching member, a first guide rail is provided on the matching member, and a first guide rail groove is provided on the first door panel, when the hinge assembly switches from the flattened state to the folded state, the first guide rail member slides relative to the first guide rail groove of the first door panel and pushes the first door panel to rotate. The first guide rail member slides relative to the first guide rail groove, and when the first guide rail member slides to the first bending section of the first guide rail portion, due to the different extension trends of the first bending section before (such as to the head end) and after (such as to the tail end) the first turning line, the groove shape or extension direction of the first bending section is arc-shaped, so that the sliding trajectory of the first door panel relative to the first guide rail member is also curved and turning, rather than linear. When the first guide rail member slides to the first turning line of the first guide rail groove, a turning point will also appear in the sliding trajectory of the first door panel relative to the first guide rail member.

[0011] In this way, by adjusting the position of the first bending section in the first guide rail part, the groove shape or extension direction of the first bending section, such as changing the position of the first turning line, changing the extension trend and extension length from the first turning line to the first turning line, changing the extension trend and extension length from the first turning line to the tail end of the first bending section, etc., it is possible to adjust the sliding trajectory of the first door panel and the turning point position of the sliding trajectory, adjust the sliding trajectory of the first door panel relative to the matching part (such as the swinging part), and then adjust the rotation trajectory and rotation speed of the first door panel relative to the main shaft. That is, by reasonably designing the first bending section of the first guide rail part, it is possible to adjust the rotation trajectory and rotation speed of the first door panel relative to the main shaft. For example, in the process of switching the hinge assembly from the flattened state to the intermediate state of a small angle, the sliding speed of the first door panel relative to the first guide rail and the main shaft can be relatively large, and the first door panel can pull the flexible screen, increase the gap between the flexible screen and the main shaft, and reduce or avoid the problem of the flexible screen back-arching when the hinge assembly is in the intermediate state of a small angle.

[0012] In a possible implementation, the rotating mechanism includes a swinging member, one end of which is rotatably connected to the main shaft, the matching member is a swinging member, a first guide rail member is provided on the swinging member, a first mounting seat is provided on the end of the first assembly surface of the first door panel adjacent to the main shaft, and a first guide rail groove is provided on the first mounting seat. Providing the first mounting seat and forming the first guide rail groove on the first door panel has little effect on the size of the swinging member, has little effect on the difficulty of the structural design of the entire rotating mechanism, and can also reasonably utilize the space inside the hinge assembly, which is conducive to ensuring the small size design of the hinge assembly under the condition of adjusting the rotation trajectory of the first door panel.

[0013] In one possible implementation, one of the ends of the main shaft and the swinging member has an arc-shaped guide rail, and the other has an arc-shaped arm. The arc-shaped arm is slidably arranged in the arc-shaped guide rail. The swinging member and the main shaft are rotationally connected through the sliding cooperation between the arc-shaped arm and the arc-shaped guide rail. The structural design is simple and easy to implement.

[0014] In a possible implementation, the first guide rail portion includes a first bending section, and the first bending section has a first turning line. When the hinge assembly is in a flattened state, from the first end to the first turning line, the first guide rail portion is inclined in a direction close to the main axis and facing the first assembly surface of the first door panel, that is, the portion of the first guide rail portion located between the first turning line and the first end is inclined in a direction gradually close to the main axis and facing the first assembly surface (first supporting surface) in the direction from the first end to the first turning line.

[0015] From the first turning line to the second end, the first guide rail portion is inclined toward the direction close to the main axis and facing the first assembly surface of the first door panel, that is, the portion of the first guide rail portion located between the first turning line and the second end is inclined toward the direction gradually approaching the main axis and facing the first assembly surface (first support surface) in the direction from the first turning line to the second end. This makes the downward inclination of the portion of the first guide rail portion between the head end and the first turning line greater (relative to the first assembly surface of the first door panel), and the inclination extension direction is steeper.

[0016] When the rotating mechanism rotates relative to the main shaft to switch the hinge assembly from the flattened state to the intermediate state with a small angle, the first guide rail member of the swinging member can slide from the first end along the first guide rail groove to the position of the first turning line. The first guide rail portion between the first end and the first turning line is closer to the main shaft and has a greater inclination facing the first assembly surface (or the first supporting surface), which is conducive to the rotation of the first door panel, so that the first door panel can rotate at a higher speed, the first door panel can better pull the flexible screen, increase the screen space, and increase the gap between the flexible screen and the main shaft (the second door panel).

[0017] When the rotating mechanism continues to rotate, causing the hinge assembly to switch from the intermediate state with a small angle to the folded state, the first guide rail member of the swinging member can slide over the portion of the first guide rail portion between the first turning line and the second end, so that the rotation speed of the first door panel is relatively slow, so as to avoid the rotation of other structural members of the rotating mechanism and form a screen space for accommodating the flexible screen.

[0018] In a possible implementation, the extension length of the first guide rail portion between the first turning line and the first end is less than the extension length of the first guide rail portion between the first turning line and the second end. This can further ensure that when the hinge assembly switches between the flattened state and the intermediate state with a small angle, the first door panel has a larger rotation speed, which can better pull the flexible screen, thereby increasing the gap between the flexible screen and the second door panel, and reducing or avoiding the reverse arch problem of the flexible screen.

[0019] In a possible implementation, the first guide rail portion between the first bending section and the first end is a linear straight section, and the first guide rail portion between the first bending section and the second end is a linear straight section. This is beneficial to reducing the complexity of the entire rotating mechanism design, facilitating production design implementation, and also beneficial to reducing the structural design and molding difficulty of the first guide rail groove.

[0020] In a possible implementation, the main shaft includes a second door panel and a main outer shaft, the first door panel and the second door panel are located on the same side of the hinge assembly, the main outer shaft is arranged on the second assembly surface of the second door panel, the matching part is the main outer shaft, a first guide rail part is arranged on the main outer shaft, a first mounting seat is arranged on the first assembly surface of the first door panel, and a first guide rail groove is arranged on the first mounting seat. The implementation methods of adjusting the rotation track of the first door panel are enriched, the degree of freedom of structural design is improved, and it is conducive to reducing the design difficulty and structural complexity of the rotation mechanism, and facilitating production and assembly.

[0021] In a possible implementation, the first guide rail portion is an arc-shaped first bending section to ensure the rotation of the first door panel relative to the main axis.

[0022] The first bending section includes a first turning line. When the hinge assembly is in a flattened state, from the first end to the first turning line, the first guide rail portion is inclined toward a first assembly surface close to the main axis and facing away from the first door panel, that is, the portion of the first guide rail portion located between the first end and the first turning line gradually extends upward in a direction close to the main axis and facing away from the first assembly surface in the direction from the first end to the first turning line.

[0023] From the first turning line to the second end, the first guide rail portion is inclined toward the direction close to the main axis and facing the first assembly surface of the first door panel. That is, the portion of the first guide rail portion located between the first turning line and the second end gradually extends downwardly toward the direction close to the main axis and facing the first assembly surface in the direction from the first turning line to the second end. The extension trend of the first guide rail portion in the direction from the first end to the first turning line is opposite to the extension trend of the first guide rail portion in the direction from the first turning line to the second end, and a turning change of the inclination trend occurs at the position of the first turning line.

[0024] When the rotating mechanism rotates relative to the main shaft and switches the hinge assembly from a flattened state to an intermediate state with a small angle, the first door panel rotates relative to the main shaft, and the first guide groove of the first door panel slides relative to the first guide member. The portion of the first guide portion between the first end portion and the first turning line first slides over the first guide member. This portion of the first guide portion is inclined toward the direction close to the main shaft and away from the first assembly surface, which is beneficial to the rotation of the first door panel relative to the main shaft. The rotation speed of the first door panel relative to the main shaft can be greater, so as to increase the gap between the flexible screen and the main shaft (second door panel) and reduce or avoid the problem of flexible screen arching.

[0025] When the rotating mechanism continues to rotate and the hinge assembly switches from the intermediate state with a small angle to the folded state, the portion of the first guide rail portion between the first turning line and the second end of the first guide rail groove slides over the first guide rail member. This portion of the first guide rail portion is inclined toward the direction close to the main axis and facing the first assembly surface, so that the rotation speed of the first door panel can be relatively slow.

[0026] In a possible implementation, the extension length of the first guide rail portion between the first turning line and the first end is greater than the extension length of the first guide rail portion between the first turning line and the second end, which can further ensure that when the hinge assembly switches between the flattened state and the intermediate state of the small angle, the first door panel has a larger rotation speed, and can better pull the flexible screen.

[0027] In a possible implementation, the matching piece includes a first coordination portion and a second coordination portion, a first gap is provided between the first coordination portion and the second coordination portion, and a first plug hole and a second plug hole are respectively provided on the first coordination portion and the second coordination portion.

[0028] At least part of the first mounting seat is located in the gap between the first positioning portion and the second positioning portion, the first guide rail member is inserted into the first guide rail groove, and the two ends of the first guide rail member are respectively fixed in the first insertion hole and the second insertion hole. Under the condition that the main shaft and the first door panel are slidably matched, the integration degree of the main shaft and the first door panel assembly is improved, and the thinning of the entire hinge assembly is facilitated. The structural design is simple, and it is easy to produce and assemble.

[0029] In one possible implementation, each rotating mechanism also includes a connecting member and a linkage member, which are respectively located on the first assembly surface side of the first door panel. In each rotating mechanism, the connecting member is rotationally connected to the first door panel, one end of the linkage member is rotationally matched with the main shaft, and the other end of the linkage member is slidably matched with the connecting member.

[0030] In the two rotating mechanisms, one end of the linkage member in one of the rotating mechanisms cooperates with one end of the linkage member in the other rotating mechanism, thereby realizing the linkage of the two rotating mechanisms. It only needs to drive the rotating mechanism on one side to rotate in order to make the rotating mechanism on the other side rotate. The operation is more convenient and helps to improve the user experience.

[0031] In a possible implementation, a second guide groove is provided on the other end of the linkage member and one of the connecting members, and a second guide member that can slide along the second guide groove is provided on the other one. One end of the linkage member is rotated relative to the main shaft, and the second guide member on the other end of the linkage member slides in the second guide groove, so that the linkage member slides relative to the connecting member and drives the connecting member to rotate relative to the main shaft. The rotation of the connecting member causes relative sliding between the connecting member and the first door panel and drives the first door panel to rotate relative to the main shaft. The extension track of the second guide groove (such as the extension direction, the shape of the groove body along the extension direction, etc.) determines the sliding track of the connecting member relative to the linkage member. The connecting member slides relative to the first door panel and drives the first door panel to rotate relative to the main shaft. The sliding track of the connecting member will affect the sliding track of the first door panel. By reasonably designing the second guide groove, the sliding track of the connecting member and the first door panel can be adjusted, and the rotation track and rotation speed of the first door panel relative to the main shaft can also be adjusted.

[0032] The second guide rail groove includes a third end, a second guide rail portion and a fourth end. When the hinge assembly is in a flattened state, the second guide rail member is located at the third end. When the hinge assembly is in a folded state, the second guide rail member is located at the fourth end. The second guide rail portion is located between the third end and the fourth end, and the second guide rail portion includes at least one arc-shaped second bending section. The second bending section refers to the extension direction or groove shape of the part of the second guide rail groove that is not straight but is arc-shaped, with the extension trend or direction of the opposite side walls of the second guide rail groove being consistent, that is, the extension direction of the side walls of the part of the second guide rail groove is arc-shaped.

[0033] The second bending section includes a second turning line. For example, the second turning line of the second bending section is the turning position of the extension trend of one side wall of the second bending section, and the extension trend of the arc-shaped second bending section changes at the position of the second turning line. When the rotating mechanism rotates relative to the main shaft to switch the hinge assembly from the flattened state to the folded state, the second guide rail member on the linkage member slides relative to the second guide rail groove on the connecting member and pushes the connecting member to rotate, thereby driving the first door panel to rotate. When the second guide rail members slide to the second bending section position of the second guide rail part respectively, due to the different extension trends of the second bending section before and after the second turning line, the groove shape or extension direction of the second bending section is arc-shaped and curved, so that the relative sliding trajectory of the linkage member and the connecting member is also curved and curved, rather than linear, and a turning point will also appear in the relative sliding trajectory between the connecting member and the linkage member.

[0034] By adjusting the number of second bending segments, the position of each second bending segment on the second guide rail, the groove shape or extension direction of each second bending segment, such as changing the position of the second turning line, changing the extension trend and extension length of the second turning line, etc., it is possible to adjust the sliding trajectory of the connecting member and the first door panel, and then adjust the rotation trajectory and rotation speed of the first door panel relative to the main shaft. For example, when the hinge assembly switches from a flattened state to a small-angle intermediate state, the speed of rotation of the first door panel relative to the main shaft can be made greater, so that the first door panel can better pull the flexible screen, further increase the gap between the flexible screen and the main shaft (the second supporting surface of the second door panel), and better solve the problem of the flexible screen arching when the hinge assembly is in a small-angle intermediate state.

[0035] In a possible implementation, the connecting member has a second mounting seat on one end along the main shaft axis, and a second guide rail groove is provided on the second mounting seat. A second guide rail member is provided on the linkage member. The linkage member has a smaller spatial dimension than the connecting member, so that the second guide rail member is located on the linkage member, and the second guide rail groove is located on the connecting member, which facilitates the reasonable use of the structure of the linkage member and the connecting member, reduces the difficulty of the structural design of the second guide rail member and the second guide rail groove, and reduces the complexity of the structural design of the entire hinge assembly.

[0036] In a possible implementation, the second guide rail portion includes two second bending segments, which are respectively a first sub-bending segment and a second sub-bending segment, and the third end, the first sub-bending segment, the second sub-bending segment and the fourth end are connected in sequence.

[0037] When the hinge assembly is in a flattened state, from the third end to the second turning line of the first sub-bending section, the second guide rail portion is inclined toward the direction close to the main axis and away from the first assembly surface of the first door panel, that is, the portion of the second guide rail portion located between the third end and the second turning line of the first sub-bending section gradually approaches the main axis and inclines away from the first assembly surface.

[0038] From the second turning line of the first sub-bending section to the second turning line of the second sub-bending section, the second guide rail portion is inclined toward the direction close to the main axis and away from the first assembly surface of the first door panel, that is, the portion of the second guide rail portion located between the second turning line of the first sub-bending section and the second turning line of the second sub-bending section gradually approaches the main axis and inclines away from the first assembly surface. Moreover, the portion of the second guide rail portion located between the second turning line and the second turning line of the second sub-bending section has a greater inclination relative to the first assembly surface, and the inclination extension direction is steeper.

[0039] From the second turning line of the second sub-bending section to the fourth end, the second guide rail portion is inclined toward the direction close to the main axis and toward the first assembly surface of the first door panel, so that the second guide rail groove is S-shaped.

[0040] When the rotating mechanism rotates relative to the main shaft and the hinge assembly switches from a flattened state to an intermediate state with a small angle, the linkage member slides relative to the connecting member. For example, the second guide member of the linkage member can slide from the third end along the second guide groove to the position of the second turning line of the first sub-bending section. During the sliding process, the linkage member drives the connecting member to rotate, and drives the first door panel to rotate through the connecting member, so that the inclination of the second guide portion between the third end and the second turning line is relatively small, which is beneficial to the rotation of the first door panel and makes the first door panel rotate at a faster speed. The first door panel can better pull the flexible screen to increase the gap between the flexible screen and the main shaft.

[0041] When the hinge assembly is switched from an intermediate state at a larger angle to a folded state, the second guide rail member of the linkage member can slide from the second turning line position of the second sub-bending segment to the fourth end portion, so that the extension trend of the partial second guide rail portion between the second turning line of the second sub-bending segment and the partial second guide rail portion between the second turning line of the first sub-bending segment and the second turning line of the second sub-bending segment is opposite, and the rotation speed of the first door panel can be adjusted to make the rotation speed of the first door panel relatively small to avoid the rotation of other structural parts.

[0042] In a possible implementation, the second guide rail groove further includes a transition section, which is located between the first sub-bending section and the second sub-bending section, and is a linear straight section, which is conducive to reducing the structural design of the second guide rail groove, that is, the complexity of the molding, and further reducing the complexity of the entire rotating mechanism design, which is easy to implement.

[0043] In a possible implementation, the linkage member includes a first linkage part and a second linkage part, a second gap is provided between at least part of the first linkage part and the second linkage part, and a third socket and a fourth socket are respectively provided on the first linkage part and the second linkage part. At least part of the second mounting seat is located in the second gap, the second guide rail member is passed through the second guide rail groove, and the two ends of the second guide rail member are respectively fixed in the third socket and the fourth socket. When the linkage member and the connecting member are slidably matched, the integration of the linkage member and the connecting member assembly is further improved, which facilitates the thinning of the entire hinge assembly. In addition, the structural design is simple, and has little effect on the structural matching and transmission design between the linkage member and the main shaft, etc., which is convenient for production and assembly.

[0044] In a possible implementation, a protrusion is provided on one end of the connecting member, the protrusion is located on one side of the second mounting seat, and an arc-shaped slide groove is formed between the protrusion and the second mounting seat. The arc-shaped slide groove is formed by rationally utilizing the second mounting seat on the connecting member, which is conducive to improving the compactness of the assembly of the connecting member, the linkage member, and the first door panel, and is easy to implement by simplifying the structural design of the connecting member.

[0045] An arc-shaped sliding wall is protruded on the first assembly surface of the first door panel, and the arc-shaped sliding wall slides along the arc-shaped sliding groove, thereby realizing rotational cooperation between the connecting piece and the first door panel.

[0046] A second aspect of an embodiment of the present application provides a hinge assembly, comprising a main shaft and two rotating mechanisms located on both sides of the main shaft, the two rotating mechanisms are respectively located on both sides of the main shaft, and the two rotating mechanisms are respectively rotatably connected to the main shaft.

[0047] Each rotating mechanism includes a first door panel, a connecting member and a linkage member, wherein the connecting member and the linkage member are respectively located on the first assembly surface side of the first door panel, the connecting member is rotationally connected to the first door panel, one end of the linkage member is rotationally matched with the main shaft, and the other end of the linkage member is slidingly matched with the connecting member. In the two rotating mechanisms, one end of the linkage member in one rotating mechanism is linkage-matched with one end of the linkage member in the other rotating mechanism.

[0048] A second guide rail groove is provided on the other end of the linkage member and one of the connecting members, and a second guide rail member that can slide along the second guide rail groove is provided on the other one of the connecting members. The second guide rail groove includes a third end, a second guide rail member and a fourth end. When the hinge assembly is in a flattened state, the second guide rail member is located at the third end, and when the hinge assembly is in a folded state, the second guide rail member is located at the fourth end.

[0049] The second guide rail portion is located between the third end portion and the fourth end portion, and the second guide rail portion includes at least one arc-shaped second bending section, and the second bending section is used to adjust the rotation trajectory of the first door panel relative to the main axis.

[0050] By adjusting the number of second bending segments, the position of each second bending segment on the second guide rail, the groove shape or extension direction of each second bending segment, such as changing the position of the second turning line, changing the extension trend and extension length of the second turning line, etc., it is possible to adjust the sliding trajectory of the connecting member and the first door panel, and adjust the rotation trajectory and rotation speed of the first door panel relative to the main shaft. For example, when the hinge assembly switches from a flattened state to a small-angle intermediate state, the speed of rotation of the first door panel relative to the main shaft can be made greater, so that the first door panel can better pull the flexible screen, increase the gap between the flexible screen and the main shaft (the second supporting surface of the second door panel), and solve the problem of the flexible screen arching when the hinge assembly is in a small-angle intermediate state.

[0051] A third aspect of the embodiments of the present application provides a foldable electronic device, comprising at least two middle frames and any one of the above hinge assemblies. The two middle frames are respectively located on both sides of the hinge assembly, and the two middle frames are rotatably connected through the hinge assembly.

[0052] In a possible implementation, the electronic device further includes a flexible screen, which is located at least on the same side of the hinge assembly and the middle frame, and the flexible screen is located on a side of the first door panel of the hinge assembly that is opposite to the first assembly surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of the structure of a foldable electronic device in a folded state provided by an embodiment of the present application;

[0054] Figure 2 A schematic diagram of a foldable electronic device in an intermediate state provided by an embodiment of the present application;

[0055] Figure 3 A schematic diagram of the structure of a foldable electronic device in a flattened state provided in an embodiment of the present application;

[0056] Figure 4 A schematic diagram of the inner structure of a hinge assembly in a flattened state provided in an embodiment of the present application;

[0057] Figure 5a A schematic diagram of assembling a hinge assembly provided in an embodiment of the present application with a flexible screen when the hinge assembly is in a flattened state;

[0058] Figure 5b A schematic diagram of assembling a hinge assembly and a flexible screen when another electronic device provided by an embodiment of the present application is in a flattened state;

[0059] Figure 6a It is a schematic diagram of assembling a swinging member and a first door panel when a hinge assembly in the related art is in a flattened state;

[0060] Figure 6b It is a schematic diagram of assembling a hinge assembly with a flexible screen when the hinge assembly is in an intermediate state with a small angle in the related art;

[0061] Figure 6c It is a schematic diagram of assembling a hinge assembly with a flexible screen in an electronic device in the related art when the hinge assembly is in an intermediate state with a small angle;

[0062] Figure 7 A schematic cross-sectional structure diagram of another hinge assembly provided in an embodiment of the present application when in a flattened state;

[0063] Figure 8 for Figure 7 a cross-sectional front view of the middle hinge assembly;

[0064] Fig. 9 for Figure 7 A magnified schematic diagram of the local structure;

[0065] Fig.10 A schematic front cross-sectional view of another hinge assembly provided in an embodiment of the present application at the position of a first guide rail groove when the hinge assembly is in a flattened state;

[0066] Fig.11 for Fig.10 A schematic diagram of the assembly of the first door panel, the second door panel and the flexible screen when the middle hinge assembly is in an intermediate state with a small angle;

[0067] Fig.12 A schematic diagram of a simulation trajectory of bending of a flexible screen in a hinge assembly provided in an embodiment of the present application;

[0068] Fig.13 To pass Fig.12 A schematic diagram of a curve of the gap between the flexible screen and the second door panel of the main shaft obtained by simulation;

[0069] Fig.14 for Figure 4 A schematic diagram of the outer structure of the middle hinge assembly in a flattened state;

[0070] Fig.15 for Fig.14 A schematic diagram of a partial split structure of the middle hinge assembly;

[0071] Fig.16 for Fig.15 A schematic diagram of the cross-sectional structure of the middle hinge assembly at the position of the first guide rail groove;

[0072] Fig.17 for Fig.16 A schematic front cross-sectional view of the middle hinge assembly at the position of the first guide rail groove;

[0073] Fig.18 16 is a schematic structural diagram of the main outer shaft in the hinge assembly;

[0074] Fig.19 for Fig.16 A schematic diagram of a partially disassembled structure of a main outer shaft and a first door panel in a hinge assembly;

[0075] Fig. 20 for Fig.14 A schematic diagram of another partial split structure of the middle hinge assembly;

[0076] Fig.21 for Fig. 20 A schematic diagram of the split structure of the linkage member, the connecting member and the first door panel in the hinge assembly;

[0077] Fig. 22 for Fig. 20 A schematic cross-sectional structure diagram of the hinge assembly at the position of the second guide rail groove when the hinge assembly is in a flattened state;

[0078] Fig.23 for Fig. 22 A schematic front view of the cross section of the middle hinge assembly at the position of the second guide rail groove when the middle hinge assembly is in a flattened state.

[0079] Description of reference numerals:

[0080] 100- electronic equipment;

[0081] 10-Flexible screen;

[0082] 20-middle frame; 21-first middle frame; 22-second middle frame;

[0083] 30-hinge assembly;

[0084] 31-spindle;

[0085] 311-main outer shaft; 3112-first coordination portion; 3112a-first insertion hole; 3113-second coordination portion; 3113a-second insertion hole; 3114-guide portion;

[0086] 312-second door panel; 3121-second supporting surface; 3122-second assembly surface; 313-arc guide rail;

[0087] 32-rotation mechanism;

[0088] 321-first door panel; 3211-first supporting surface; 3212-first assembly surface;

[0089] 3214-first bending section; 3218-arc sliding wall;

[0090] 322-swinging member; 3221-arc arm;

[0091] 323-connector;

[0092] 3231-second guide rail groove; 3231a-third end portion; 3231b-second guide rail portion;

[0093] 3232-second bending segment; 3232a-first sub-bending segment; 3232b-second sub-bending segment;

[0094] 3233-transition section; 3231c-fourth end; 3234-arc-shaped slide groove; 3235-second mounting seat; 3236-protruding member;

[0095] 324 - linkage member; 3241 - second guide rail member; 3242 - first linkage portion; 3243 - second linkage portion. DETAILED DESCRIPTION

[0096] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0097] The foldable electronic device provided in the embodiments of the present application may include but is not limited to foldable electronic terminals such as mobile phones, tablet computers, laptop computers, ultra-mobile personal computers (UMPCs), handheld computers, touch-screen televisions, walkie-talkies, netbooks, POS machines, personal digital assistants (PDAs), wearable devices, and virtual reality devices.

[0098] In the embodiments of the present application, the foldable electronic device is described as a foldable mobile phone, wherein the foldable mobile phone may also be a foldable mobile phone with a foldable screen. Alternatively, in some other examples, the foldable mobile phone may be a foldable mobile phone with a foldable screen and an additional external screen, or the foldable mobile phone may be a foldable mobile phone with a partial foldable screen and a partial foldable screen. Alternatively, in some examples, the foldable mobile phone may also be a foldable mobile phone with a foldable screen.

[0099] The following takes a foldable mobile phone with an inward-folding screen as an example, and describes in detail the foldable electronic device and hinge assembly provided in the embodiments of the present application in combination with the accompanying drawings.

[0100] Figure 1 A schematic diagram of a foldable electronic device in a folded state provided in an embodiment of the present application. Figure 2A schematic diagram of a foldable electronic device in an intermediate state provided in an embodiment of the present application, Figure 3 A schematic structural diagram of a foldable electronic device in a flattened state provided in an embodiment of the present application.

[0101] See also Figure 1 and Figure 2 As shown, the foldable electronic device 100 may include at least a hinge assembly 30 and a middle frame 20. For example, the number of the middle frames 20 is at least two. For example, taking two middle frames 20 as an example, they are a first middle frame 21 and a second middle frame 22, respectively. The first middle frame 21 and the second middle frame 22 are located on both sides of the hinge assembly 30, and the first middle frame 21 and the second middle frame 22 are respectively connected to the hinge assembly 30. Specifically, the first middle frame 21 and the second middle frame 22 can be respectively connected to the rotating mechanism in the hinge assembly 30.

[0102] The hinge assembly 30 can realize the rotational cooperation of the two middle frames 20, that is, the two middle frames 20 can be rotationally cooperated through the hinge assembly 30, so that the two middle frames 20 can rotate relative to each other, that is, the first middle frame 21 and the second middle frame 22 can rotate relative to each other.

[0103] See also Figure 1 As shown, the first middle frame 21 and the second middle frame 22 can be folded relative to each other to a closed state. Exemplarily, the first middle frame 21 and the second middle frame 22 are in a closed state, and the two can be completely closed to be parallel to each other (a slight deviation is allowed). At this time, the electronic device 100 is in a closed state, also called a folded state.

[0104] See also Figure 2 As shown, the first middle frame 21 and the second middle frame 22 can be relatively rotated (folded or unfolded) to an intermediate state, so that the electronic device 100 is in the intermediate state.

[0105] See also Figure 3 As shown, the first middle frame 21 and the second middle frame 22 can be relatively unfolded to an open state. Exemplarily, the first middle frame 21 and the second middle frame 22 are in an open state, and the two can be approximately 180° (a slight deviation is allowed), and the electronic device 100 is in an open state, also called a flat state.

[0106] in, Figure 2 The intermediate state shown may be any state between the open state and the closed state, that is, the electronic device 100 can switch between the open state (i.e. the flattened state) and the closed state (i.e. the folded state) through the movement of the hinge assembly 30 .

[0107] In the present application embodiment, Figure 1 and Figure 3As shown in the figure, the electronic device 100 is in a flattened state or a folded state, the width direction of the electronic device 100 is the x direction, the length direction of the electronic device 100 is the y direction, and the thickness direction of the electronic device 100 is the z direction. The length, width, and thickness in the embodiment of the present application are only for the convenience of description and do not mean any limitation on the size. For example, the length can be greater than, equal to, or less than the width.

[0108] It should be noted that the electronic device 100 may include only two middle frames 20, that is, the number of the first middle frame 21 and the second middle frame 22 may both be one, so that the electronic device 100 is in a folded state, and the first middle frame 21 and the second middle frame 22 are relatively folded into two layers, see Figure 1 As shown, the electronic device 100 includes a first middle frame 21, a second middle frame 22 and a hinge assembly 30. The first middle frame 21 and the second middle frame 22 are rotatably connected via the hinge assembly 30. The first middle frame 21 and the second middle frame 22 are folded relative to each other, so that the electronic device 100 is in a two-layer form.

[0109] Alternatively, the electronic device 100 may also include multiple middle frames 20, that is, the number of the first middle frame 21, the second middle frame 22 and the hinge assembly 30 may be multiple, and the adjacent first middle frames and the second middle frames are connected by a hinge assembly, so that the electronic device can be folded into a multi-layer form. For example, the electronic device may include two first middle frames, one second middle frame and two hinge assemblies, the two first middle frames are located on both sides of the second middle frame, and the two first middle frames are respectively rotatably connected to the second middle frame by a hinge assembly, one of the first middle frames can be folded relative to the second middle frame, and the other first middle frame can also be folded relative to the second middle frame, so that the electronic device is in a folded state, and the first middle frame and the second middle frame are relatively folded into a three-layer form. When one of the first middle frames and the second middle frame are relatively unfolded to a flattened state (such as the two are approximately 180°), the electronic device is in a flattened state.

[0110] In the embodiment of the present application, an electronic device including two middle frames is taken as an example for description.

[0111] See also Figure 3As shown, the electronic device 100 may also include a foldable flexible screen 10, wherein the flexible screen 10 is laid on the hinge assembly 30 and the two middle frames 20, and specifically, the flexible screen 10 is at least located on the same side surface of the first middle frame 21, the second middle frame 22 and the hinge assembly 30. When the first middle frame 21 and the second middle frame 22 are folded relative to each other, the flexible screen 10 is attached to the first middle frame 21 and the second middle frame 22, and the part of the flexible screen 10 opposite to the hinge assembly 30 is bent to form a water drop shape, and the hinge assembly 30 is folded and encloses a screen space, and the bent flexible screen 10 is at least partially located in the screen space. When the first middle frame 21 and the second middle frame 22 are relatively unfolded, the hinge assembly 30 and the flexible screen 10 are also unfolded.

[0112] Among them, for a foldable electronic device with a folded screen inward, the flexible screen 10 is arranged on the inner surface of the first middle frame 21, the second middle frame 22 and the hinge assembly 30. For a foldable electronic device with a folded screen outward, the flexible screen 10 is arranged on the outer surface of the first middle frame 21, the second middle frame 22 and the hinge assembly.

[0113] It should be noted that when the electronic device 100 is in a folded state, the two adjacent and opposite surfaces of the first middle frame 21 and the second middle frame 22 are the inner surfaces of the first middle frame 21 and the second middle frame 22, and the surface of the hinge assembly 30 on the same side as the inner surfaces of the first middle frame 21 and the second middle frame 22 is the inner surface of the hinge assembly 30. The two opposite surfaces of the first middle frame 21 and the second middle frame 22 are the outer surfaces of the first middle frame 21 and the second middle frame 22, and the surface of the hinge assembly 30 on the same side as the outer surfaces of the first middle frame 21 and the second middle frame 22 is the outer surface of the hinge assembly.

[0114] In the embodiment of the present application, the flexible display screen is located on the inner surfaces of the first middle frame, the second middle frame and the hinge assembly as an example for description.

[0115] In the embodiment of the present application, the first middle frame 21 may include a first middle plate and a first frame, and the first frame is arranged on the outer peripheral edge of the first middle plate. The second middle frame 22 may also include a second middle plate and a second frame, and the second frame is arranged on the outer peripheral edge of the second middle plate. The rotating mechanism in the hinge assembly 30 may be connected to the first middle plate and the second middle plate respectively.

[0116] The electronic device may also include a circuit board and a battery. The battery may be connected to the charging management module and the circuit board through a power management module. The power management module receives input from the battery and / or the charging management module and powers the processor, internal memory, external memory, foldable flexible screen 10, camera module, and communication module. The power management module can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc. In some other embodiments, the power management module may also be arranged in the processor of the circuit board. In other embodiments, the power management module and the charging management module may also be arranged in the same device.

[0117] The electronic device may further include a back cover. The flexible display screen may be located on one side of the two middle frames 20, and the back cover may be located on the other side of the two middle frames 20. The back cover may serve as an appearance cover on the back of the electronic device to protect the internal structure of the electronic device (such as circuit boards and batteries, etc.) and enhance the aesthetics of the electronic device.

[0118] It is to be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. For example, the electronic device may also include devices such as cameras (such as front cameras and rear cameras), batteries, heat dissipation structures, and flashes.

[0119] The hinge assembly provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0120] Figure 4 A schematic diagram of the inner structure of a hinge assembly in a flattened state provided in an embodiment of the present application.

[0121] See also Figure 4 As shown, the hinge assembly 30 includes a main shaft 31 and two rotating mechanisms 32 located on both sides of the main shaft 31, such as a rotating mechanism 32a and a rotating mechanism 32b. The axial direction of the main shaft 31 can be aligned with the length direction of the electronic device (such as Figure 3 The two rotating mechanisms 32 may be located at opposite sides of the main shaft 31 in a direction perpendicular to the axial direction.

[0122] Each rotating mechanism 32 includes a first door panel 321, such as the rotating mechanism 32a may include a first door panel 321a, and the rotating mechanism 32b may include a first door panel 321b. A second door panel 312 is provided on the main shaft 31, and the first door panel 321a and the first door panel 321b may be located on both sides of the second door panel 312, respectively. The first door panel 321 and the second door panel 312 may be located on the same side of the entire hinge assembly 30, and illustratively, the first door panel 321 and the second door panel 312 may have a first supporting surface 3211 and a second supporting surface 3121, respectively, and the first supporting surface 3211 and the second supporting surface 3121 may be located on the inner side of the entire hinge assembly 30, as the inner side surface of the hinge assembly 30.

[0123] Figure 5a A schematic diagram of assembling a hinge assembly with a flexible screen when in a flattened state provided in an embodiment of the present application.

[0124] See also Figure 5a As shown, the flexible screen 10 can be laid on the first supporting surface 3211 of the first door panel 321 and the second supporting surface 3121 of the second door panel 312. For example, the flexible screen 10 can be bonded to the first supporting surfaces 3211 of the two first door panels 321 by means of adhesive or dispensing. The first door panel 321 and the second door panel 312 can provide a relatively flat surface for the flexible screen 10 to form a better support.

[0125] The first door panel 321 and the second door panel 312 may be a whole door panel structure respectively, or the first door panel 321 and the second door panel 312 may be formed by splicing a plurality of door panels respectively.

[0126] Continue to see Figure 4 As shown, the two rotating mechanisms 32 are respectively connected to the main shaft 31, that is, the two rotating mechanisms 32 can rotate relative to the main shaft 31, so that the two rotating mechanisms 32 can rotate relative to each other. It can be understood that when the rotating mechanism 32 rotates relative to the main shaft 31, the first door panel 321 of the rotating mechanism 32 also rotates relative to the main shaft 31 and the second door panel 312.

[0127] The rotating mechanism 32 is connected to the middle frame of the electronic device, so as to realize the rotational cooperation between the middle frame and the main shaft 31 , and then realize the rotational cooperation between the two middle frames through the hinge assembly 30 .

[0128] For example, see Figure 4As shown, the rotating mechanism 32a and the rotating mechanism 32b are located on both sides of the main shaft 31. The rotating mechanism 32a can be arranged adjacent to the first middle frame, and the rotating mechanism 32a can be connected to the first middle frame, so that the first middle frame can be rotated with the main shaft 31 through the rotating mechanism 32a. The rotating mechanism 32b can be arranged adjacent to the second middle frame, and the rotating mechanism 32b can be connected to the second middle frame, so that the second middle frame can be rotated with the main shaft 31 through the rotating mechanism 32b.

[0129] When the two rotating mechanisms rotate in opposite directions relative to the main axis and thus unfold relatively to the open state, for example, see Figure 4 As shown, the angle between the rotating mechanism 32a, the rotating mechanism 32b and the main shaft 31 can be approximately 180 degrees, and the angle formed between the rotating mechanism 32 and the main shaft 31 is the unfolding angle of the hinge assembly 30, that is, the unfolding angle is 180 degrees at this time, and the hinge assembly 30 is in a flat state. The two middle frames can also be relatively unfolded to an open state as the two rotating mechanisms 32 rotate, so that the electronic device is also in a flat state.

[0130] Combination Figure 5a As shown, when the hinge assembly is in a flattened state, the angles between the first door panel 321a, the first door panel 321b and the second door panel 312 can also be approximately 180° respectively, the first supporting surface 3211 of the first door panel 321 and the second supporting surface 3121 of the second door panel 312 can be approximately flush to form a plane, and the flexible screen 10 is laid flat on the first supporting surface 3211 and the second supporting surface 3121.

[0131] Figure 5b A schematic diagram of the assembly of a hinge assembly and a flexible screen when another electronic device provided in an embodiment of the present application is in a flattened state.

[0132] It should be noted that, in order to ensure the bending effect of the flexible screen 10, the second door panel 312 and the flexible screen 10 may not have a bonding relationship, or the bonding contact area may be small. Alternatively, due to production and assembly errors, the angle between the rotating mechanism 32 (first door panel 321) and the main shaft 31 (second door panel 312) may be approximately 180°, such as 170°, 175°, 185° or 190°. Therefore, in some examples, see Figure 5b As shown, when the hinge assembly 30 is in a flattened state, the portion of the flexible screen 10 corresponding to the hinge assembly 30 may not be strictly planar, and may have slight undulations.

[0133] When the two rotating mechanisms are relatively rotated (folded or unfolded) to the intermediate state, such as the unfolding angle of the hinge assembly is less than 180°, the two middle frames are relatively rotated to the intermediate state along with the rotating mechanisms, so that the electronic device is in the intermediate state.

[0134] When the hinge assembly is in the middle state, the angle between the first door panel and the second door panel is also less than 180°, and the flexible screens on the first door panel and the second door panel bend as the first door panel and the rotating mechanism rotate.

[0135] When the two rotating mechanisms rotate relative to the main axis and are folded (folded) to a closed state, the two rotating mechanisms can be folded relative to each other to be parallel, and the hinge assembly is also in a folded state. The rotating mechanisms and the main axis can together enclose a screen space. The two middle frames are also folded relative to each other to a closed state along with the rotating mechanisms, so that the electronic device is also in a closed state.

[0136] When the hinge assembly is in a folded state, the first door panel and the second door panel can also be in a parallel state, and the flexible screen is bent into a teardrop shape and located in the screen space, that is, located on the inner side of the two first door panels and the second door panel (facing the side of the screen space).

[0137] In this way, the hinge assembly can be switched between the flattened state and the closed state by rotating the rotating mechanism relative to the main shaft, thereby realizing the mutual switching of the electronic device between the flattened state and the closed state.

[0138] Typically, each rotating mechanism may include a swinging member, one end of which is in sliding cooperation with the main shaft. For example, one end of the swinging member may have an arc-shaped sliding wall, and the main shaft may have an arc-shaped sliding groove. The arc-shaped sliding wall of the swinging member may slide in the arc-shaped sliding groove of the main shaft, thereby making the swinging member rotate relative to the main shaft, thereby realizing the rotational cooperation between the rotating mechanism and the main shaft.

[0139] Figure 6a The present invention is a schematic diagram of the assembly of a swinging member and a first door panel when a hinge assembly in the related art is in a flattened state.

[0140] See also Figure 6aAs shown, the swing member 200 and the first door panel 300 can be slidably matched. For example, taking the first door panel 300a of one of the rotating mechanisms as an example, a slide groove 301 can be provided on the first door panel 300a, and a pin 201 can be provided on the swing member 200. The pin 201 can be inserted into the slide groove 301 and slide along the slide groove 301. For example, the slide groove 301 can include a first end 3011 and a second end 3012. When the hinge assembly is in a flattened state, the pin 201 can be located in the first end 3011 of the slide groove 301. When the hinge assembly switches from the flattened state to the folded state, one end of the swing member 200 rotates relative to the main shaft, and the rotation trajectory of the swing member 200 relative to the main shaft is an arc. The pin 201 of the swing member 200 can slide from the first end 3011 along the slide slot 301 to the second end 3012, and the swing member 200 and the first door panel 300 slide relative to each other. At the same time, the swing member 200 also drives the first door panel 300 to rotate relative to the main shaft (and the second door panel), thereby realizing the relative rotation between the rotating mechanism and the main shaft. When the hinge assembly is in the folded state, the pin 201 can be located in the second end 3012 of the slide slot 301.

[0141] Figure 6b The figure is a schematic diagram of assembling a hinge assembly with a flexible screen when the hinge assembly is in an intermediate state with a small angle in the related art. Figure 6c It is a schematic diagram of the assembly of a hinge assembly and a flexible screen in an electronic device in the related art when the hinge assembly is in an intermediate state with a small angle.

[0142] When the hinge assembly is in an intermediate state with a smaller unfolding angle, for example, when the unfolding angle of the hinge assembly is less than 10°, that is, the angle between the rotating mechanism and the main axis is less than 10°, as shown in FIG. Figure 6b As shown, the included angle between the first door panel 300a and the second door panel 400, and the included angle between the first door panel 300b and the second door panel 400 are respectively less than 10°.

[0143] Exemplarily, the rotating mechanism is rotated to move the hinge assembly from a flattened state (as shown in FIG. Figure 5b When the rotating mechanism rotates to a smaller unfolding angle of the hinge assembly, as the rotating mechanisms on both sides (the first door panels) rotate, the part of the flexible screen 500 opposite to the main axis will move toward the main axis to gradually form a water drop-shaped bend. Figure 6b As shown, this will result in a smaller gap or even no gap between the flexible screen 500 and the second door plate 400 of the main shaft, such as Figure 6c As shown, it is very easy to cause the part of the flexible screen 500 opposite to the main axis to bend and arch, that is, this part of the flexible screen bulges away from the main axis, forming a dead fold with the inwardly folded flexible screen, which is very easy to cause damage to the flexible screen and affect the user experience.

[0144] It is understandable that when the hinge assembly switches from a folded state to a flattened state (or an intermediate state), when the rotating mechanism rotates to a smaller unfolding angle of the hinge assembly, there is a problem of a small gap or even no gap between the flexible screen and the main axis, resulting in the problem of the flexible screen arching.

[0145] In the related art, the sliding grooves used to realize the sliding of the first door panel are mostly linear through grooves, that is, the rotation of the first door panel is approximately uniform, and the control of the moving trajectory of the first door panel is limited. It is impossible to adjust the rotation trajectory of the first door panel and the bending state of the flexible screen, and it is difficult to solve the problem of the flexible screen being easily arched when the hinge assembly is in an intermediate state with a small angle.

[0146] Based on this, an embodiment of the present application provides a hinge assembly, including a main shaft and two rotating mechanisms located on both sides of the main shaft, the two rotating mechanisms are respectively connected to the main shaft for rotation, so as to realize the switching of the hinge assembly between the flattened state and the closed state. Each rotating mechanism includes a first door panel, and at least one of the main shaft and each rotating mechanism includes a matching piece, and the matching piece can be a structural member included in at least one of the main shaft and the rotating structure that can slide relative to the first door panel. The first door panel and the matching piece are made to slide in a manner of matching the first guide rail groove and the first guide rail member, and the sliding track of the first door panel relative to the matching piece is determined by the extension track of the first guide rail groove. By making the first guide rail groove include a first end, a first guide rail part and a second end, when the hinge assembly is in a flattened state and a folded state, the first guide rail part is respectively located at the first end and the second end, and the first guide rail part includes an arc-shaped first bending section, and the first bending section refers to the extension direction or the groove shape (the overall contour shape of the groove body in the extension direction) of the first guide rail groove of this part is not straight, but is curved and turned in an arc, and the extension trend of the arc-shaped first bending section changes at the position of the first turning line. By adjusting the position of the first bending section on the first guide rail, the groove shape or extension direction of the first bending section, such as changing the position of the first turning line, changing the extension trend and extension length from the first turning line to the first turning line, changing the extension trend and extension length from the first turning line to the tail end of the first bending section, etc., the sliding trajectory of the first door panel can be adjusted, and the rotation trajectory of the first door panel relative to the main shaft can be adjusted, and then the rotation speed of the first door panel can be adjusted. For example, in the process of switching the hinge assembly from a flattened state to a small-angle intermediate state, the sliding speed of the first door panel relative to the first guide rail can be relatively large, the rotation speed of the first door panel is large, the first door panel can pull the flexible screen, increase the gap between the flexible screen and the main shaft (second door panel), and reduce or avoid the problem of the flexible screen arching when the hinge assembly is in a small-angle intermediate state.

[0147] In order to adjust the rotation track of the first door panel, in some examples, the sliding track of the first door panel can be directly adjusted by designing a guide groove for sliding the first door panel, which is convenient for adjusting the rotation of the first door panel and helps to reduce the difficulty of adjustment design.

[0148] Figure 7 A schematic diagram of the cross-sectional structure of another hinge assembly provided in an embodiment of the present application when in a flattened state.

[0149] For example, see Figure 7 As shown, the hinge assembly 30 includes a main shaft 31 and a rotating mechanism 32. For example, taking the number of the rotating mechanisms 32 as two, namely the rotating mechanism 32a and the rotating mechanism 32b, the rotating mechanism 32a and the rotating mechanism 32b can be located on both sides of the main shaft 31 respectively.

[0150] The first door plate 321 of the rotating mechanism 32 also includes a first assembly surface 3212, such as Figure 7 For example, the first door panel 321 in the rotating mechanism 32a includes a first assembly surface 3212 and a first support surface (refer to Figure 4 The first assembly surface 3212 and the first support surface may be located on opposite sides of the first door panel 321 in the thickness direction. The structural parts of the rotating mechanism 32 (such as the swinging part, linkage part, connecting part, etc. described below) may be located on the first assembly surface 3212 side of the first door panel 321.

[0151] The main shaft 31 and at least one of each rotating mechanism 32 include a mating piece that can slidably cooperate with the first door panel 321, so that relative sliding occurs between the mating piece and the first door panel 321 when the hinge assembly 30 switches between the flattened state and the folded state.

[0152] It should be noted that the matching part is a structural part included in at least one of the main shaft 31 and the rotating mechanism 32, and can slide relative to the first door panel 321. For example, the matching part can be a structural part included in the main shaft 31, or the matching part can also be a structural part included in the rotating mechanism 32, or, in some examples, the structural parts in the main shaft 31 and the rotating mechanism 32 can respectively serve as matching parts and slide relative to the first door panel 321.

[0153] For example, the matching member may be one or more structural members included in the rotating mechanism 32 that can slide relative to the first door panel 321. Figure 7 As shown, taking the rotating mechanism 32 a as an example, the rotating mechanism 32 may include a swinging member 322 , and at least a portion of the swinging member 322 may be located on a side of the first assembly surface 3212 of the first door panel 321 facing away from the first supporting surface 3211 .

[0154] One end of the swing member 322 is rotatably connected to the main shaft 31 to achieve rotational cooperation between the swing member 322 and the main shaft 31. The rotational cooperation method between the one end of the swing member 322 and the main shaft 31 is not limited in the embodiment of the present application. For example, the one end of the swing member 322 and the main shaft 31 can achieve rotational cooperation by means of guide rail cooperation. For example, an arc guide rail 313 can be provided on one of the one end of the swing member 322 and the main shaft 31, and an arc arm 3221 can be provided on the other end of the swing member 322. The arc arm 3221 is provided in the arc guide rail 313 and slides along the arc guide rail 313, thereby achieving rotational cooperation between one end of the swing member 322 and the main shaft 31. The structural design is simple, which is convenient for achieving rotational cooperation between the swing member 322 and the main shaft 31, and is conducive to improving the integration of the entire hinge assembly 30.

[0155] Among them, see Figure 7 As shown, the arc guide rail 313 can be opened on the main shaft 31, and an arc arm 3221 can be formed at one end of the swing member 322. Alternatively, in some other examples, the arc guide rail 313 can also be located at one end of the swing member 322 (refer to Fig.15 As shown), an arc-shaped arm 3221 is provided on the main shaft 31 (refer to Fig.18 Alternatively, in some other examples, one end of the swing member 322 may also be rotatably matched with the main shaft 31 in other ways, such as shaft-hole matching, connecting rod transmission, etc.

[0156] The swinging member 322 can be slidably matched with the first door panel 321. When the rotating mechanism 32 rotates to switch the hinge assembly 30 between the flattened state and the folded state, one end of the swinging member 322 rotates relative to the main shaft 31, causing the swinging member 322 and the first door panel 321 to slide relative to each other, and driving the first door panel 321 to rotate relative to the main shaft 31. The swinging member 322 can serve as a matching member.

[0157] A first guide groove 3213 may be provided on one of the mating part (such as the swinging part 322) and the first door panel 321, and a first guide member 3222 may be provided on the other one. The first guide member 3222 may slide along the first guide groove 3213, so that the first door panel 321 and the mating part (such as the swinging part 322) can achieve sliding fit through the sliding of the first guide member 3222 in the first guide groove 3213.

[0158] For example, see Figure 7 As shown, taking the swing member 322 as an example, a first guide rail member 3222 may be provided on the swing member 322 , and a first guide rail groove 3213 may be provided on the first assembly surface 3212 of the first door panel 321 .

[0159] For example, a first mounting seat 3215 may be provided on the first assembly surface 3212 of the first door panel 321. The first mounting seat 3215 may be located at one end of the first door panel 321 adjacent to the main shaft 31, and a first guide groove 3213 may be provided on the first mounting seat 3215. The first guide member 3222 can slide along the first guide groove 3213, thereby realizing relative sliding between the first door panel 321 and the swing member 322.

[0160] It can be understood that the first door panel 321 and the matching part (such as the swinging part 322) are slidably matched by sliding between the first guide rail part 3222 and the first guide rail groove 3213, and the sliding trajectory of the first door panel 321 relative to the matching part (swinging part 322) is determined by the extension trajectory of the first guide rail groove 3213 (such as the extension direction, the shape of the groove body along the extension direction, etc.).

[0161] Figure 8 for Figure 7 Sectional front view of the center hinge assembly.

[0162] See also Figure 8 As shown, the first guide rail groove 3213 may include a first end 3213a, a first guide rail portion 3213b and a second end 3213c, the first end 3213a, the first guide rail portion 3213b and the second end 3213c are connected in sequence, and the first guide rail portion 3213b is located between the first end 3213a and the second end 3213c.

[0163] See also Figure 8 As shown in FIG. 1 , when the hinge assembly 30 is in a flattened state, the first guide rail member 3222 may be located at the first end portion 3213a. Figure 8 When the flattened state is switched to the folded state, the rotating mechanism 32 rotates relative to the main shaft 31 (such as along Figure 8 When the hinge assembly 30 is in the folded state, the first guide member 3222 can slide along the first guide groove 3213 of the first door panel 321 toward the second end 3213c, that is, the first guide member 3222 can slide through the first end 3213a and the first guide portion 3213b in sequence toward the second end 3213c. When the hinge assembly 30 is in the folded state, the first guide member 3222 can be located at the second end 3213c of the first guide groove 3213.

[0164] The first rail portion 3213b includes at least one arc-shaped first bending section 3214, for example Figure 8As shown in , the first guide rail portion 3213b on the first door panel 321 may include an arc-shaped first bending section 3214. The first bending section 3214 means that the extension direction or the groove shape (the overall contour shape of the groove in the extension direction) of this part of the first guide rail groove 3213 is not straight, but is curved. Figure 8 As shown, that is, the side wall of the groove body of this part of the first guide rail groove is curved. It should be noted that the extension trend and extension direction of the two opposite side walls of the first guide rail groove can be consistent.

[0165] Fig. 9 for Figure 7 A magnified schematic diagram of the local structure.

[0166] The first bending section 3214 may include a first turning line, and the extension trend of the arc-shaped first bending section 3214 turns at the position of the first turning line. For example, the position where the extension trend of a side wall of the first bending section 3214 turns may have a first turning line, such as Fig. 9 The end where the first bending segment 3214 is connected to the first end 3213a is the head end of the first bending segment 3214, and the end where the first bending segment 3214 is connected to the second end 3213c is the tail end of the first bending segment 3214. In the direction from the head end to the first turning line, the extension trend of the first bending segment 3214 and the extension trend of the first bending segment 3214 in the direction from the first turning line to the tail end are changed.

[0167] In the embodiment of the present application, the extension trend may refer to the inclination trend of the groove body or the side wall relative to the first assembly surface or the first support surface of the first door panel, and the turning change of the extension trend may refer to the change of the extension direction, such as from facing the first assembly surface to facing away from the first assembly surface, etc. Alternatively, it may refer to the change of the degree of inclination (inclination angle) relative to the first assembly surface or the first support surface.

[0168] Fig.10 A schematic front cross-sectional view of another hinge assembly provided in an embodiment of the present application at the position of a first guide rail groove when the hinge assembly is in a flattened state.

[0169] For example, see Fig.10As shown, with the vertical projection of the first turning line in the axial direction of the hinge assembly as the turning point o1, from the beginning of the first bending section 3214 (the end connected to the first end) to the first turning line of the first bending section 3214 (at the turning point o1), the extension trend of the first bending section 3214 is to gradually approach the main axis 31 and tilt downwardly facing the first assembly surface 3212 of the first door panel 321, and from the first turning line of the first bending section 3214 (at the turning point o1) to the tail end of the first bending section 3214 (the end connected to the second end), the extension trend of the first bending section 3214 is also to gradually approach the main axis 31 and tilt downwardly facing the first assembly surface 3212 of the first door panel 321.

[0170] Moreover, relative to the first bending section 3214 from the first turning line (at the turning point o1) to the tail end, the first bending section 3214 from the head end to the first turning line (at the turning point o1) has a greater downward inclination (relative to the first assembly surface 3212 of the first door panel 321) and a steeper extending direction. Fig.10 The tangent of the part of the first bending section 3214 from the head end to the first turning line (at the turning point o1) is r1, and the tangent of the part of the first bending section 3214 from the first turning line (at the turning point o1) to the tail end is r2. An angle is formed between the two tangents, so that the extension trend (extension direction) of the two parts of the first bending section 3214 before (to the head end) and after (to the tail end) the first turning line changes.

[0171] When the hinge assembly 30 is Figure 8 When the flattened state is switched to the folded state, the first guide rail member 3222 slides relative to the first guide rail groove 3213 of the first door panel 321 and pushes the first door panel 321 to rotate. Fig.10 As shown, the first guide rail member 3222 slides relative to the first guide rail groove 3213. When the first guide rail member 3222 slides to the position of the first bending section 3214 of the first guide rail portion 3213b, due to the different extension trends of the first bending section 3214 before (such as to the first end side) and after (such as to the second end side) the first turning line, the groove shape or extension direction of the first bending section 3214 is arc-shaped and curved, so that the sliding trajectory of the first door panel 321 relative to the first guide rail member 3222 is also curved and curved, rather than linear. When the first guide rail member 3222 slides to the first turning line position of the first guide rail groove 3213, a turning point will also appear in the sliding trajectory of the first door panel 321 relative to the first guide rail member 3222.

[0172] In this way, by adjusting the position of the first bending section 3214 on the first guide rail portion 3213b, the groove shape or extension direction of the first bending section 3214, such as changing the position of the first turning line, changing the extension trend and extension length from the head end of the first bending section 3214 to the first turning line, changing the extension trend and extension length from the first turning line to the tail end of the first bending section 3214, etc., it is possible to adjust the sliding trajectory of the first door panel 321 and the turning point position of the sliding trajectory, adjust the sliding trajectory of the first door panel 321 relative to the matching part (such as the swinging part 322), and then adjust the rotation trajectory and rotation speed of the first door panel 321 relative to the main axis. For example, when the hinge assembly 30 switches from a flattened state to an intermediate state at a small angle, the sliding speed of the first door panel 321 relative to the first guide rail member 3222 and the main shaft can be relatively large, and the rotation speed of the first door panel 321 is relatively large. The first door panel 321 can pull the flexible screen, thereby increasing the gap between the flexible screen and the main shaft (the second supporting surface of the second door panel), so that the force on the flexible screen 10 will not change suddenly during the bending process, thereby reducing or avoiding the problem of the flexible screen arching when the hinge assembly is in the intermediate state at a small angle.

[0173] During the process of switching the hinge assembly from the intermediate state with a small angle to the folded state, the sliding speed of the first door panel 321 relative to the first guide rail member 3222 and the main shaft can be made relatively small, so as to ensure the rotation of other structural parts in the rotating mechanism that rotate relative to the main shaft (such as swinging parts, linkage parts, etc.), and ensure that the hinge assembly can be stably in the folded state.

[0174] Accordingly, when the hinge assembly 30 switches from the folded state to the intermediate state at a small angle, the sliding speed of the first door panel 321 relative to the first guide rail member 3222 and the main shaft can be reduced. When the hinge assembly 30 switches from the intermediate state at a small angle to the flattened state, the sliding speed of the first door panel 321 relative to the first guide rail member 3222 and the main shaft can be increased, thereby solving the problem of the flexible screen's reverse arch when the hinge assembly is in the intermediate state at a small angle.

[0175] For example, in the example where the swing member 322 is a matching member, a first guide rail 3222 is provided on the swing member 322, and a first mounting seat 3215 is provided on the first assembly surface 3212 of the first door panel 321 (see Fig. 9 As shown), a first guide groove 3213 is opened on the first mounting seat 3215 to realize the sliding of the swing member 322 and the first door panel 321, and the rotation trajectory of the first door panel 321 is adjusted by designing the extension direction and groove shape of the first guide groove 3213.

[0176] A first mounting seat 3215 is provided on the first door panel 321 and a first guide groove 3213 is formed, which has little effect on the size of the swinging member 322 and the difficulty of the structural design of the entire rotating mechanism. It can also reasonably utilize the space inside the hinge assembly, and is conducive to ensuring the small size design of the hinge assembly while achieving the adjustment of the rotating trajectory of the first door panel 321.

[0177] Of course, in some other examples, a first guide groove 3213 may be provided on the swinging member 322 , and a first guide member 3222 may be provided on the first door panel 321 , so that relative sliding of the first door panel 321 and the swinging member 322 can be achieved through the first guide member 3222 and the first guide groove 3213 .

[0178] Continue to see Fig. 9 As shown, the first guide rail portion 3213b of the first guide rail groove 3213 may include only one first bending section 3214, that is, the extension trend of the first guide rail groove 3213 turns at the first turning line L1 of the first bending section 3214, and the extension trend of the part of the first guide rail portion 3213b between the first end 3213a and the first turning line L1 of the first bending section 3214 and the extension trend of the part of the first guide rail portion 3213b between the first bending section 3214 and the second end 3213c turn at the first turning line L1.

[0179] For example, combined with Fig.10 As shown, when the hinge assembly 30 is in a flattened state, from the first end 3213a to the first turning line (at the turning point o1), the first guide rail portion 3213b is inclined in a direction close to the main axis and facing the first assembly surface 3212 (first supporting surface) of the first door panel 321. That is, the portion of the first guide rail portion 3213b located between the first turning line and the first end 3213a is inclined in a direction gradually close to the main axis and facing the first assembly surface 3212 (first supporting surface) in the direction from the first end 3213a to the first turning line (at the turning point o1).

[0180] From the first turning line (at the turning point o1) to the second end 3213c, the first guide rail portion 3213b is inclined toward the direction close to the main axis and facing the first assembly surface 3212 of the first door panel 321, that is, the part of the first guide rail portion 3213b located between the first turning line and the second end 3213c is inclined toward the direction gradually close to the main axis and facing the first assembly surface 3212 (first supporting surface) in the direction from the first turning line (at the turning point o1) to the second end 3213c. This makes the downward inclination of the part of the first guide rail portion 3213b between the head end and the first turning line greater (relative to the first assembly surface of the first door panel 321), and the inclination extension direction is steeper.

[0181] When the rotating mechanism rotates relative to the main shaft, the hinge assembly Fig.10 When the flattened state in the image is switched to an intermediate state with a small angle, such as when the expansion angle is switched to an intermediate state of 10°, combined with Fig. 9 As shown, the first guide rail member 3222 of the swing member 322 can slide from the first end 3213a along the first guide rail groove 3213 to the position of the first turning line (turning point o1). The first guide rail portion 3213b between the first end 3213a and the first turning line is closer to the main shaft and faces the first assembly surface 3212 (or the first supporting surface) with a greater inclination, which is conducive to the rotation of the first door panel 321, so that the first door panel 321 can rotate at a higher speed, and the first door panel 321 can better pull the flexible screen, increase the screen space, and increase the gap between the flexible screen and the main shaft (second door panel).

[0182] Fig.11 for Fig.10 Assembly diagram of the first door panel, the second door panel and the flexible screen when the middle hinge assembly is in an intermediate state with a small angle.

[0183] For example, see Fig.11 As shown, when the hinge assembly is in an intermediate state with an unfolded angle of 10°, the gap between the flexible screen 10 and the second door panel 312 of the main shaft 31 is larger, which reduces or avoids the problem of the flexible screen 10 arching when the hinge assembly is in an intermediate state with a small angle.

[0184] When the rotating mechanism continues to rotate, the hinge assembly switches from the intermediate state with a small angle to the folded state. The first guide rail member 3222 of the swing member 322 can slide over the first guide rail portion 3213b between the first turning line and the second end portion 3213c (see Fig.10 As shown in FIG. 1 , the first door panel 321 rotates at a relatively low speed to avoid the rotation of other structural members of the rotating mechanism (such as swing members, linkage members, etc.), thereby forming a screen-accommodating space for accommodating the flexible screen. When the hinge assembly is in a folded state, the first guide rail member 3222 is located at the second end 3213c.

[0185] For example, see Fig.10 As shown, the first guide rail portion 3213b between the first bending section 3214 and the first end 3213a can be a linear straight section. The first guide rail portion 3213b between the first bending section 3214 and the second end 3213c can also be a linear straight section, which is conducive to reducing the complexity of the design of the entire rotating mechanism 32, facilitating the production design and implementation, and also helping to reduce the structural design and molding difficulty of the first guide rail groove 3213.

[0186] Of course, in some examples, the first rail portion 3213b between the first bending section 3214 and the first end 3213a may also be an arc segment with a certain curvature. The first rail portion 3213b between the first bending section 3214 and the second end 3213c may also be an arc segment with a certain curvature.

[0187] The extension length of the portion of the first rail portion 3213b between the first turning line (at the turning point o1) and the first end 3213a may be less than the extension length of the portion of the first rail portion 3213b between the first turning line (at the turning point o1) and the second end 3213c, wherein the extension length refers to the extension length of the groove body in the extension direction of the first rail groove 3213. The extension length of the portion of the first rail portion 3213b between the first turning line (at the turning point o1) and the first end 3213a may be the path length of the first rail member 3222 sliding from the first end 3213a along the first rail groove 3213 to the first turning line (at the turning point o1), and the extension length of the portion of the first rail portion 3213b between the first turning line (at the turning point o1) and the second end 3213c may be the path length of the first rail member 3222 sliding from the first turning line (at the turning point o1) along the first rail groove 3213 to the second end 3213c.

[0188] By making the extension length of the portion of the first guide rail portion 3213b between the first turning line and the first end portion 3213a smaller than the extension length of the portion of the first guide rail portion 3213b between the first turning line and the second end portion 3213c, it can further ensure that when the hinge assembly switches between the flattened state and the intermediate state with a small angle, the first door panel 321 has a greater rotation speed, can better pull the flexible screen, thereby increasing the gap between the flexible screen and the second door panel, and reducing or avoiding the problem of the flexible screen's reverse arch.

[0189] It should be noted that the matching member may also be other structural members in the rotating mechanism 32. For example, each rotating mechanism 32 may also include a connecting member 323 (see Figure 7The connecting member 323 is located on the first assembly surface 3212 side of the first door panel 321, such as the connecting member 323 is at least partially located on the side of the first assembly surface 3212 of the first door panel 321 that is away from the first supporting surface 3211.

[0190] The end of the connecting member 323 facing away from the main shaft 31 is used to connect to the middle frame of the electronic device, and the connecting member 323 can slide with the other end of the swing member 322. When the rotating mechanism 32 rotates relative to the main shaft 31, the other end of the swing member 322 slides relative to the connecting member 323 and drives the connecting member 323 to rotate relative to the main shaft 31.

[0191] Among them, the sliding cooperation method of the connecting member 323 and the swinging member 322 is not limited in the embodiment of the present application. For example, the other end of the swinging member 322 can achieve sliding cooperation with the connecting member 323 by means of guide rail cooperation. For example, a sliding groove can also be opened on the connecting member 323, and the other end of the swinging member 322 can slide in the sliding groove, thereby achieving sliding cooperation between the other end of the swinging member 322 and the connecting member 323.

[0192] Of course, in some other examples, the other end of the swinging member 322 can also achieve sliding cooperation with the connecting member 323 in other ways. For example, there can be a sliding groove on the other end of the swinging member 322, and there can be a raised slider on the connecting member 323. The relative sliding between the connecting member 323 and the swinging member 322 is achieved through the sliding cooperation between the slider and the sliding groove.

[0193] In some examples, the connecting member 323 can be slidably matched with the first door panel 321. When the rotating mechanism 32 rotates to switch the hinge assembly 30 between the flattened state and the folded state, the connecting member 323 rotates relative to the main shaft 31, and causes the connecting member 323 and the first door panel 321 to slide relative to each other, and drives the first door panel 321 to rotate relative to the main shaft 31. The connecting member 323 can serve as a matching member.

[0194] It should be noted that when the mating parts are different, such as different structural parts in the rotating mechanism 32 or the main shaft 31, the number of first bending sections 3214 included in the first guide rail portion 3213b in the first guide rail groove 3213, the groove shape of the first bending section 3214, the extension trend or groove formation from the head end of the first bending section 3214 to the first turning line, the extension trend or groove shape from the first turning line of the first bending section 3214 to the tail end of the first bending section 3214, etc., can be selected and set according to the actual structural design of the rotating mechanism 32 and the main shaft 31, the position and type of the mating parts, the assembly relationship between the first door panel 321 and the mating parts, etc.

[0195] In the actual design of the hinge assembly 30, simulation tests can be used to adjust the extension trend and shape of the first guide groove 3213, obtain the sliding trajectory of the first door panel 321 under different first guide grooves 3213, and then obtain the required first guide groove 3213 to achieve the required structural design of the hinge assembly 30.

[0196] Fig.12 A schematic diagram of a simulation trajectory of bending of a flexible screen in a hinge assembly provided in an embodiment of the present application.

[0197] For example, taking the above-mentioned swinging member as the matching member, a first guide rail member a is provided on the swinging member, and a first guide rail groove a is provided on the first door panel. Fig.12 As shown, an initial first guide groove 3213 trajectory can be designed first, and the motion trajectory of the hinge assembly (the arc trajectory in the figure) can be obtained by motion simulation. The motion trajectory is used as the driving force for the bending of the flexible screen, and then the bending of the flexible screen is simulated to obtain the shape of the flexible screen from unfolding to closing, and the gap between the flexible screen and the second door plate of the main shaft is recorded. By modifying the trajectory of the first guide groove 3213, and then outputting the motion morphology simulation structure of the flexible screen under the trajectory, and recording the gap between the flexible screen and the second door plate of the main shaft, it is possible to obtain a curve diagram of the change in the gap between the flexible screen and the second door plate of the main shaft under different first guide groove 3213 trajectory conditions, and then obtain the desired design of the first guide groove 3213.

[0198] Fig.13 To pass Fig.12 Schematic diagram of the curve of the gap between the flexible screen and the second door panel of the main shaft obtained by simulation.

[0199] See also Fig.13 As shown, curve S1 is the gap curve between the flexible screen and the second door panel in the hinge assembly in the related technology where the first guide groove a is a linear through groove, and curve S2 is the gap curve between the flexible screen and the second door panel in the hinge assembly in which the first guide groove a includes a first bending section provided in an embodiment of the present application.

[0200] Depend on Fig.13 It can be known that when using the hinge assembly of the related technology, when the hinge assembly is in the intermediate state with a small angle (such as ≤10°), the gap between the flexible screen and the second door panel of the main axis is only 0.08mm or even 0mm, that is, the flexible screen can easily abut against the second door panel, and the flexible screen is prone to arching at this time.

[0201] In the hinge assembly of the embodiment of the present application, when the first guide groove includes the first bending section, the hinge assembly switches between the flattened state and the intermediate state of a small angle (such as ≤10°), so that the rotation speed of the first door panel is relatively high, pulling the flexible screen and increasing the gap between the flexible screen and the second door panel. Fig.13As shown, when the hinge assembly is in an intermediate state at a small angle, the gap between the flexible screen and the second door panel can be between 0.2mm-0.35mm, which significantly reduces the risk of the flexible screen arching.

[0202] Alternatively, in some examples, the mating parts may be one or more structural parts included in the main shaft that can slide relative to the first door panel, thereby enriching the implementation methods for adjusting the rotation trajectory of the first door panel, improving the freedom of structural design, and helping to reduce the design difficulty and structural complexity of the rotating mechanism, thereby facilitating production and assembly.

[0203] Fig.14 for Figure 4 Schematic diagram of the outer structure of the middle hinge assembly in a flattened state.

[0204] For example, see Fig.14 As shown, the main shaft 31 may include a main outer shaft 311 and a second door plate 312 , and the main outer shaft 311 may be fixed on the second door plate 312 .

[0205] Fig.15 for Fig.14 Schematic diagram of a partial split structure of the middle hinge assembly.

[0206] Combination Fig.15 As shown, the second door panel 312 may further include a second assembly surface 3122. The second assembly surface 3122 and a second support surface (not shown in the figure) may be located at two opposite sides of the second door panel 312 in the thickness direction. The first assembly surface 3212 and the second assembly surface 3122 may be located on the same side (refer to Fig.14 As shown), the first supporting surface and the second supporting surface may be located on the same side.

[0207] Continue to see Fig.15 As shown, the main outer shaft 311 can be arranged on the second assembly surface 3122 of the second door panel 312, combined with Fig.14 As shown, the first door panel 321 is rotatably arranged relative to the main outer shaft 311. When the hinge assembly 30 switches between the flattened state and the folded state, the first door panel 321 can slide relative to the main shaft 31 (main outer shaft 311) in an arc shape, thereby causing the first door panel 321 to rotate relative to the main shaft 31, and the main outer shaft 311 can serve as a matching part.

[0208] Of course, in some other examples, the main shaft 31 may also include a main inner shaft (not shown in the figure), the second door panel 312 may be arranged on one side of the main inner shaft, the main outer shaft 311 may be located on the side of the main inner shaft facing away from the second door panel 312, and the main outer shaft 311 is fixed to the main inner shaft. The first door panel 321 is rotatably arranged relative to the main inner shaft, and when the hinge assembly 30 switches between the flattened state and the folded state, the first door panel 321 can rotate relative to the main inner shaft, and the main inner shaft can also serve as a matching part.

[0209] For example, see Fig.15 As shown, taking the main outer shaft 311 as an example, a first guide rail member 3111 may be provided on the main outer shaft 311. A first guide rail groove 3216 is provided on the first assembly surface 3212 of the first door panel 321. For example, a first mounting seat 3217 may be provided on the first assembly surface 3212 of the first door panel 321. The first mounting seat 3217 may be located at one end of the first door panel 321 adjacent to the main shaft 31, and a first guide rail groove 3216 may be provided on the first mounting seat 3217.

[0210] It should be noted that the first mounting seat 3217 on the first door panel 321 may be the same as or different from the structure and shape of the first mounting seat 3215. The structures of the first guide rail member 3111 and the first guide rail member 3222 may be the same as or different, and correspondingly, the structures of the first guide rail groove 3213 and the first guide rail groove 3216 may be the same as or different.

[0211] Fig.16 for Fig.15 Schematic diagram of the cross-sectional structure of the middle hinge assembly at the position of the first guide rail groove.

[0212] Combination Fig.16 As shown, the first guide rail member 3111 can slide along the first guide rail groove 3216 , thereby achieving relative sliding between the first door panel 321 and the main outer shaft 311 .

[0213] Of course, in some other examples, a first guide rail groove 3216 may be provided on the main outer shaft 311 , and a first guide rail member 3111 may be provided on the first door panel 321 , so that relative sliding of the first door panel 321 and the main outer shaft 311 can be achieved through the first guide rail member 3111 and the first guide rail groove 3216 .

[0214] See also Fig.16 As shown, the first guide rail groove 3216 may include a first end 3216a, a first guide rail portion 3216b and a second end 3216c, the first end 3216a, the first guide rail portion 3216b and the second end 3216c are connected in sequence, and the first guide rail portion 3216b is located between the first end 3216a and the second end 3216c.

[0215] like Fig.16 As shown in FIG. 1 , when the hinge assembly 30 is in a flattened state, the first guide rail member 3111 may be located at the first end portion 3216a. Fig.16 When the hinge assembly 30 is switched from the flattened state to the folded state, the rotating mechanism 32 rotates relative to the main shaft 31, so that the first door panel 321 rotates relative to the main shaft 31, and the first guide groove 3216 of the first door panel 321 moves relative to the first guide member 3111, that is, the first end 3216a and the first guide portion 3216b of the first guide groove 3216 sequentially slide over the first guide member 3111. When the hinge assembly 30 is in the folded state, the first guide member 3111 can be located at the second end 3216c.

[0216] The first guide rail portion 3216b at least includes an arc-shaped first bending section 3214, such as the first guide rail portion 3216b as a whole can be an arc-shaped first bending section 3214, so that the first door panel 321 can rotate relative to the main shaft 31. That is, the extension direction or the shape of the first guide rail groove 3216 is an arc-shaped bending turning, such as Fig.16 As shown, the side wall of the first guide rail groove 3216 is curved, and the first bending section 3214 includes a first turning line L1. For example, the turning position of the extension trend of one side wall of the first bending section 3214 is the first turning line L1 of the first bending section 3214. The extension trend of the arc-shaped first bending section 3214 turns at the position of the first turning line L1.

[0217] With the end of the first bending segment 3214 connected to the first end 3216a as the head end, and the end connected to the second end 3216c as the tail end, the extension trend of the first bending segment 3214 from the head end to the first turning line L1 and the extension trend of the first bending segment 3214 from the first turning line L1 to the tail end undergoes a turning change. The extension track of the first guide groove 3216 affects the rotation track of the first door panel 321 relative to the main shaft 31 (main outer shaft 311). By adjusting the position of the first bending section 3214 on the first guide section 3216b, the groove shape or extension direction of the first bending section 3214, such as changing the position of the first turning line L1, changing the extension trend and extension length from the head end of the first bending section 3214 to the first turning line L1, changing the extension trend and extension length from the first turning line L1 to the tail end of the first bending section 3214, etc., the sliding track of the first door panel 321 and the turning point position of the sliding track can be adjusted, and the rotation track of the first door panel 321 relative to the main shaft 31 can also be adjusted. For example, when the hinge assembly 30 switches from a flattened state to a small-angle intermediate state, the sliding speed of the first door panel 321 relative to the main shaft 31 can be made relatively large, and the first door panel 321 can pull the flexible screen 10, reducing or avoiding the problem of the flexible screen back arching.

[0218] Fig.17 for Fig.16 A schematic front cross-sectional view of the middle hinge assembly at the position of the first guide rail groove.

[0219] Exemplary, combined Fig.17 As shown, the first guide rail portion 3216b as a whole can be an arc-shaped first bending section 3214, so that the first door panel 321 can slide and cooperate with the first guide rail member 3111 of the main outer shaft 311 through the first guide rail groove 3216, thereby realizing the rotation of the first door panel 321 relative to the main outer shaft 311 (main shaft 31).

[0220] in, Fig.17 The turning point o1 is the vertical projection of the first turning line L1 along the axial direction. The two ends of the first bending section 3214 are connected to the first end 3216a and the second end 3216c respectively, that is, the extension trend of the first guide rail groove 3216 changes at the first turning line (turning point o1) of the first bending section 3214. The extension trend of the part of the first guide rail portion 3216b between the first end 3216a and the first turning line (at the turning point o1) and the extension trend of the part of the first guide rail portion 3216b between the first turning line (at the turning point o1) and the second end 3216c change at the first turning line (turning point o1).

[0221] For example, when the hinge assembly 30 is in a flattened state, from the first end 3216a to the first turning line (at the turning point o1), the first guide rail portion 3216b is inclined toward the direction of the first assembly surface 3212 (first supporting surface) close to the main shaft 31 and facing away from the first door panel 321. That is, the portion of the first guide rail portion 3216b located between the first end 3216a and the first turning line (at the turning point o1) gradually extends upward in a direction close to the main shaft 31 and facing away from the first assembly surface 3212 in the direction from the first end 3216a to the first turning line (at the turning point o1).

[0222] From the first turning line (at the turning point o1) to the second end 3216c, the first guide rail portion 3216b is inclined toward the first assembly surface 3212 (first support surface) close to the main shaft 31 and facing the first door panel 321. That is, the portion of the first guide rail portion 3216b located between the first turning line (at the turning point o1) and the second end 3216c gradually extends downwardly in a direction close to the main shaft 31 and facing the first assembly surface 3212 in the direction from the first turning line (at the turning point o1) to the second end 3216c. The extension trend of the first guide rail portion 3216b in the direction from the first end 3216a to the first turning line (at the turning point o1) is opposite to the extension trend of the first guide rail portion 3216b in the direction from the first turning line (at the turning point o1) to the second end 3216c, and a turning change of the inclination trend occurs at the first turning line.

[0223] When the rotating mechanism 32 rotates relative to the main shaft 31, the hinge assembly 30 is Fig.17 When the flattened state shown is switched to an intermediate state with a small angle, such as switching to an intermediate state with an unfolding angle of 10°, the first door panel 321 rotates relative to the main shaft 31, and the first guide groove 3216 of the first door panel 321 slides relative to the first guide member 3111. The part of the first guide portion 3216b between the first end 3216a and the first turning line (at the turning point o1) first slides over the first guide member 3111. The part of the first guide portion 3216b is inclined toward the direction close to the main shaft 31 and away from the first assembly surface 3212, which is beneficial to the rotation of the first door panel 321 relative to the main shaft 31, so that the rotation speed of the first door panel 321 relative to the main shaft 31 can be larger, so as to increase the gap between the flexible screen 10 and the main shaft 31 (second door panel), thereby reducing or avoiding the problem of the flexible screen arching.

[0224] When the rotating mechanism 32 continues to rotate, so that the hinge assembly 30 switches from the intermediate state with a small angle to the folded state, part of the first guide rail portion 3216b between the first turning line (at the turning point o1) of the first guide rail groove 3216 and the second end 3216c slides over the first guide rail member 3111, and the first guide rail portion 3216b is inclined toward the direction close to the main shaft 31 and facing the first assembly surface 3212, so that the rotation speed of the first door panel 321 is relatively slow. When the hinge assembly 30 is in the folded state, the first guide rail member 3111 is located at the second end 3216c.

[0225] Exemplarily, the extension length of the first guide rail portion 3216b from the first turning line (at the turning point o1) to the first end 3216a may be greater than the extension length of the first guide rail portion 3216b from the first turning line (at the turning point o1) to the second end 3216c. That is, the path length of the first guide rail member 3111 sliding from the first end 3216a along the first guide rail groove 3216 to the position of the first turning line (turning point o1) may be greater than the path length of the first guide rail member 3111 sliding from the first turning line (turning point o1) along the first guide rail groove 3216 to the second end 3216c. It can further ensure that when the hinge assembly 30 switches between the flattened state and the intermediate state of the small angle, the first door panel 321 has a larger rotation speed, which can better pull the flexible screen.

[0226] Fig.18 Schematic diagram of the structure of the main outer shaft in the hinge assembly 16.

[0227] Take the main outer shaft as an example, see Fig.18 As shown, illustratively, the main outer shaft 311 may include a first matching portion 3112 and a second matching portion 3113, and a first gap is provided between the first matching portion 3112 and the second matching portion 3113. For example, a convex first matching portion 3112 and a second matching portion 3113 may be provided on a surface of the main outer shaft 311 facing the second door panel (not shown in the figure), and a first gap is provided between the first matching portion 3112 and the second matching portion 3113 to form an accommodation space.

[0228] A first plug hole 3112a and a second plug hole 3113a are respectively provided on the first coordination portion 3112 and the second coordination portion 3113. For example, the first plug hole 3112a can be a through hole penetrating the first coordination portion 3112 along the axial direction of the main shaft, and the second plug hole 3113a can be a through hole penetrating the second coordination portion 3113 along the axial direction of the main shaft.

[0229] Fig.19 for Fig.16 Schematic diagram of the partial disassembled structure of the main outer shaft and the first door panel in the hinge assembly.

[0230] Combination Fig.19 As shown, a first mounting seat 3217 is provided on a first assembly surface (not shown in the figure) of the first door panel 321 , and the first mounting seat 3217 can be located on a side of the first door panel 321 adjacent to the main axis.

[0231] At least part of the first mounting seat 3217 can be inserted into the first gap between the first matching portion 3112 and the second matching portion 3113, that is, it can be accommodated in the accommodation space formed by the first gap. The first guide rail member 3111 can be inserted into the first guide rail groove 3216. For example, the first guide rail member 3111 can be a pin, and the first guide rail member can be inserted into the first guide rail groove 3216 and can slide along the first guide rail groove 3216. The two ends of the first guide rail member 3111 can be fixed in the first insertion hole 3112a and the second insertion hole 3113a respectively, so that the first guide rail member 3111 can be fixedly assembled with the main outer shaft 311 and can slide along the first guide rail groove 3216. Under the condition of achieving sliding fit between the main shaft and the first door panel 321, the integration of the main shaft and the first door panel 321 is improved, which is convenient for realizing the thinning of the entire hinge assembly. And the structural design is simple, which is convenient for production and assembly.

[0232] The main outer shaft 311 may also have an arc-shaped guide portion 3114 (see Fig.18 As shown in the figure, the guide portion 3114 can be located on the side of the first coordination portion 3112 and the second coordination portion 3113 facing away from the second door panel, the first coordination portion 3112 and the second coordination portion 3113 can be located on both sides of the guide portion 3114 respectively, and the arc-shaped guide portion 3114 can guide the sliding of the first mounting seat in the first gap, that is, guide the sliding of the first door panel, and further improve the smoothness of the sliding of the first door panel relative to the main shaft.

[0233] It should be noted that, in the example where the matching member is a rotating mechanism or other structural member included in the main shaft that can slide relative to the first door panel, the structure of the matching member and the assembly method of the matching member and the first door panel can refer to the above method. For example, in the example where the swing member 322 is used as the matching member, the swing member 322 can include a first matching portion 3112 and a second matching portion 3113, a first gap is provided between the first matching portion 3112 and the second matching portion 3113, and a first plug hole 3112a and a second plug hole 3113a are respectively provided on the first matching portion 3112 and the second matching portion 3113. The first mounting seat 3215 on the first door panel 321 can be inserted into the first gap between the first matching portion 3112 and the second matching portion 3113, the first guide rail member 3222 can be inserted into the first guide rail groove 3213, and the two ends of the first guide rail member 3222 can be fixed in the first plug hole 3112a and the second plug hole 3113a respectively.

[0234] In some examples, it is also possible to adjust the movement trajectory of a structural member that has a transmission cooperation relationship with the first door panel by design, and then indirectly adjust the sliding trajectory of the first door panel, so as to adjust the rotation trajectory and rotation speed of the first door panel, which is beneficial to further reduce the risk of back arching when the hinge assembly is in a small angle intermediate state, and enrich the implementation methods of adjusting the rotation trajectory of the first door panel, further improving the freedom of structural design.

[0235] Exemplarily, each rotating mechanism 32 may also include a linkage member 324 (see Figure 7 As shown), the linkage member 324 is located on the first assembly surface 3212 side of the first door panel 321, such as the linkage member 324 is at least partially located on the side of the first assembly surface 3212 of the first door panel 321 that is away from the first supporting surface 3211.

[0236] Fig. 20 for Fig.14 Schematic diagram of another partial disassembled structure of the middle hinge assembly.

[0237] See Fig. 20 As shown, taking the linkage member 324 in the rotating mechanism 32a as an example, one end 324a of the linkage member 324 can be rotatably matched with the main shaft 31, and the other end 324b of the linkage member 324 can be slidably matched with the connecting member 323. When the rotating mechanism 32 rotates relative to the main shaft 31, one end 324a of the linkage member 324 rotates relative to the main shaft 31, and the other end 324b of the linkage member 324 slides relative to the connecting member 323, and drives the connecting member 323 to rotate relative to the main shaft 31.

[0238] Among them, the rotational cooperation method between the linkage member 324 and the main shaft 31 is not limited in the embodiment of the present application. For example, one end 324a of the linkage member 324 can achieve rotational cooperation with the main shaft 31 by means of a guide rail cooperation. For example, one end 324a of the linkage member 324 can have an arc-shaped arm (not shown in the figure), and the main shaft 31 can have an arc-shaped guide rail (not shown in the figure), so that the arc-shaped arm at one end of the linkage member 324 can slide in the arc-shaped guide rail, thereby realizing the rotational cooperation between the linkage member 324 and the main shaft 31.

[0239] Of course, in some other examples, the linkage 324 may also achieve rotational cooperation with the main shaft 31 in other ways. For example, the linkage 324 and the main shaft 31 may achieve rotational cooperation by means of shaft hole cooperation. For example, a first shaft hole may be formed on one end 324a of the linkage 324, and a first rotating shaft may be provided on the main shaft 31. The first rotating shaft is passed through the first shaft hole, so that the linkage 324 is rotationally connected to the first rotating shaft through the first shaft hole.

[0240] Among them, one end of the two linkage members 324 located in the two rotating mechanisms 32 can be linked and matched through the main shaft 31 to realize the linkage of the rotation between the two rotating mechanisms 32. Exemplarily, when the rotating mechanism 32a rotates relative to the main shaft 31, the swing member 322, the connecting member 323 and the linkage member 324 in the rotating mechanism 32a rotate relative to the main shaft 31, and the linkage member 324 in the rotating mechanism 32a can drive the linkage member in the rotating mechanism 32b to rotate relative to the main shaft 31, so that the swing member and the connecting member in the rotating mechanism 32b also rotate relative to the main shaft 31, and then the rotating mechanism 32b rotates relative to the main shaft 31, so that the rotating mechanism 32a and the rotating mechanism 32b can realize synchronous rotation. When unfolding or folding the electronic device, only one side of the middle frame and the rotating mechanism 32 (such as the first middle frame and the rotating mechanism 32a) need to be driven to rotate, and the other side of the middle frame and the rotating mechanism 32 (such as the second middle frame and the rotating mechanism 32b) can be rotated, so that the electronic device can be folded or unfolded, and the operation is more convenient, which helps to improve the user experience.

[0241] Exemplarily, the main shaft 31 may include a linkage assembly (not shown in the figure), and a linkage structure may be provided on one end of the linkage member 324, and the linkage structures on the linkage members 324 in the two rotating mechanisms 32 may be linked together through the linkage assembly. For example, in some examples, the linkage between the two linkage members 324 in the two rotating mechanisms 32 may be achieved through gear linkage or the like, such as the linkage assembly of the main shaft 31 may include a gear assembly (not shown in the figure), the gear assembly may include a plurality of gears, and the linkage structures on one end of the linkage member 324 in the rotating mechanism 32a and one end of the linkage member in the rotating mechanism 32b may be tooth structures that can mesh with the gear assembly. When the linkage member 324 in the rotating mechanism 32a rotates relative to the main shaft 31, the gear of the gear assembly is driven to rotate, and then the linkage member in the rotating mechanism 32b is driven to rotate relative to the main shaft 31 through the gear.

[0242] Continue to see Fig. 20 As shown, the connecting member 323 can be located at one end of the first door panel 321 facing away from the main shaft 31, and the connecting member 323 can be rotatably matched with the first door panel 321. When the rotating mechanism 32 rotates, one end 324a of the linkage member 324 rotates relative to the main shaft 31, and the other end 324b of the linkage member 324 slides relative to the connecting member 323, and drives the connecting member 323 to rotate relative to the main shaft 31, so that the connecting member 323 and the first door panel 321 rotate relative to each other, and drives the first door panel 321 to rotate relative to the main shaft 31.

[0243] Exemplarily, the sliding fit between the other end of the linkage member 324 and the connecting member 323 can be achieved by means of guide rail fit, such as a second guide rail groove 3231 can be provided on the other end of the linkage member 324 and one of the connecting members 323, and a second guide rail member 3241 can be provided on the other one, and the second guide rail member 3241 can slide along the second guide rail groove 3231, thereby achieving the sliding fit between the other end of the linkage member 324 and the connecting member 323.

[0244] Fig.21 for Fig. 20 Schematic diagram of the split structure of the linkage member, the connecting member and the first door panel in the hinge assembly.

[0245] For example, see Fig.21 As shown, a second guide groove 3231 may be provided on the connecting member 323, and a second guide member 3241 may be provided on the other end 324b of the linkage member 324, and the second guide member 3241 may be slidably provided in the second guide groove 3231 (refer to Fig. 22 shown).

[0246] Of course, in some other examples, the linkage member 324 may also achieve sliding cooperation with the connecting member 323 in other forms. For example, a slide rail may be formed on the linkage member 324, and a sliding member that cooperates with the slide rail may be formed on the connecting member 323.

[0247] The rotational connection between the connecting member 323 and the first door panel 321 can also be achieved by means of guide rail cooperation, such as forming an arcuate slide groove 3234 on one of the connecting member 323 and the first door panel 321, and setting an arcuate slide wall 3218 on the other one, and the arcuate slide wall 3218 can be slidably set in the arcuate slide groove 3234, thereby achieving rotational cooperation between the connecting member 323 and the first door panel 321.

[0248] Of course, in some other examples, the rotational fit between the connecting member 323 and the first door panel 321 may also be achieved in other forms, such as shaft-hole fit.

[0249] It should be noted that the number of the swinging member 322, the connecting member 323, and the linkage member 324 in each rotating mechanism 32 may be one or more. For example, each rotating mechanism 32 may include a plurality of swinging members 322, and the plurality of swinging members 322 may be arranged at intervals along the axial direction of the main shaft 31. Each rotating mechanism 32 may include a plurality of linkage members 324, and the plurality of linkage members 324 may also be arranged at intervals along the axial direction of the main shaft 31. The number of the swinging members 322 and the number of the linkage members 324 may correspond to each other.

[0250] Fig. 22 for Fig. 20A schematic diagram of the cross-sectional structure of the hinge assembly at the position of the second guide rail groove when the hinge assembly is in a flattened state.

[0251] For example, see Fig. 22 As shown, taking the example of a second guide rail member 324 having a second guide rail member 3241 on the other end and a second guide rail groove 3231 on the connecting member 323, when the hinge assembly 30 switches from the flattened state to the folded state, the rotating mechanism 32 rotates to rotate one end of the linkage member 324 relative to the main shaft 31, and the second guide rail member 3241 on the other end of the linkage member 324 slides in the second guide rail groove 3231, so that the linkage member 324 slides relative to the connecting member 323 and drives the connecting member 323 to rotate relative to the main shaft 31. The rotation of the connecting member 323 causes the connecting member 323 and the first door panel 321 to slide relative to each other and drives the first door panel 321 to rotate relative to the main shaft 31.

[0252] It is understandable that the extension track (such as the extension direction, the shape of the groove body along the extension direction, etc.) of the second guide groove 3231 determines the sliding track of the connecting member 323 relative to the linkage member 324. The connecting member 323 slides relative to the first door panel 321 and drives the first door panel 321 to rotate relative to the main shaft 31. The sliding track of the connecting member 323 affects the sliding track of the first door panel 321. Therefore, by reasonably designing the second guide groove 3231, the sliding track of the connecting member 323 can be adjusted, and the rotation track of the first door panel 321 can also be adjusted.

[0253] Continue to see Fig. 22 As shown, the second guide rail groove 3231 may include a third end 3231a, a second guide rail portion 3231b and a fourth end 3231c, the third end 3231a, the second guide rail portion 3231b and the fourth end 3231c are connected in sequence, and the second guide rail portion 3231b is located between the third end 3231a and the fourth end 3231c.

[0254] When the hinge assembly 30 is in the flattened state, the second guide rail member 3241 is located at the third end portion 3231a. Fig. 22 When the flattened state is switched to the folded state, the rotating mechanism 32 rotates relative to the main shaft 31 (such as along Fig. 22The linkage member 324 rotates relative to the main shaft 31 (in the direction of the dotted arrow shown in the figure), so that the second guide rail member 3241 on the other end of the linkage member 324 slides along the second guide rail groove 3231 of the connecting member 323 toward the fourth end 3231c, that is, the second guide rail member 3241 can slide through the third end 3231a and the second guide rail portion 3231b in sequence and slide toward the fourth end 3231c. The linkage member 324 slides relative to the connecting member 323 and drives the connecting member 323 to rotate relative to the main shaft 31, thereby causing the connecting member 323 to drive the first door panel 321 to rotate relative to the main shaft 31. When the hinge assembly 30 is in the folded state, the second guide rail member 3241 can be located at the fourth end 3231c of the second guide rail groove 3231.

[0255] The second rail portion 3231b includes at least one arc-shaped second bending section 3232. Fig. 22 As shown, the second guide rail portion 3231b may include two second bending sections 3232, such as the first sub-bending section 3232a and the second sub-bending section 3232b respectively. The second bending section 3232 refers to that the extension direction or the groove shape of this part of the second guide rail groove 3231 is not straight, but is arc-shaped and bent, so that the extension trend or direction of the opposite side walls of the second guide rail groove 3231 are consistent, that is, the extension direction of the side wall of this part of the second guide rail groove 3231 can be arc-shaped and bent.

[0256] The second bending section 3232 includes a second turning line. For example, the second turning line of the second bending section 3232 is the turning position of the extension trend of a side wall of the second bending section 3232. The extension trend of the arc-shaped second bending section 3232 turns at the position of the second turning line. For example, the third end 3231a, the first sub-bending section 3232a, the second sub-bending section 3232b and the fourth end 3231c are connected in sequence to form the second guide groove 3231. Fig. 22 As shown, the first sub-bending segment 3232a includes a second turning line L2, and the second sub-bending segment 3232b includes a second turning line L3. In the direction from the end connected to the third end 3231a to the second turning line L2, the extension trend of the first sub-bending segment 3232a and the extension trend from the second turning line L2 to the end connected to the second sub-bending segment 3232b are turned. In the direction from the end connected to the first sub-bending segment 3232a to the second turning line L3, the extension trend of the second sub-bending segment 3232b and the extension trend from the second turning line L3 to the end connected to the fourth end 3231c are turned.

[0257] When the rotating mechanism 32 rotates relative to the main shaft 31, the hinge assembly 30 is Fig. 22When the flattened state is switched to the folded state, the second guide rail member 3241 on the linkage member 324 slides relative to the second guide rail groove 3231 on the connecting member 323 and pushes the connecting member 323 to rotate, thereby driving the first door panel 321 to rotate. When the second guide rail member 3241 slides to the positions of the two second bending sections 3232 of the second guide rail portion 3231b respectively, since the extension trends of the second bending sections 3232 before and after the second turning line are different, the groove shape or extension direction of the second bending section 3232 is curved and turned in an arc shape, so that the relative sliding track between the linkage member 324 and the connecting member 323 is also curved and turned, rather than linear. For example, when the second guide rail member 3241 slides to the second turning line L2 of the second guide rail groove 3231, a turning point will appear in the relative sliding trajectory between the connecting member 323 and the linkage member 324. When the second guide rail member 3241 slides to the second turning line L3 of the second guide rail groove 3231, a turning point will appear in the relative sliding trajectory between the connecting member 323 and the linkage member 324 again.

[0258] By adjusting the number of second bending segments 3232, the position of each second bending segment 3232 on the second guide rail portion 3231b, the groove shape or extension direction of each second bending segment 3232, etc., such as changing the position of the second turning line, changing the extension trend and extension length of the second turning line, etc., it is possible to adjust the sliding track of the connecting member 323, and then adjust the sliding track of the first door panel 321, and adjust the rotation track and rotation speed of the first door panel 321 relative to the main shaft 31. For example, when the hinge assembly 30 switches from the flattened state to the intermediate state with a small angle, the first door panel 321 can rotate at a higher speed relative to the main shaft 31, so that the first door panel 321 can better pull the flexible screen, further increase the gap between the flexible screen and the main shaft 31 (the second support surface 3121 of the second door panel 312), and better solve the problem of the flexible screen back-arching when the hinge assembly 30 is in the intermediate state with a small angle.

[0259] For example, when the hinge assembly 30 switches from a small-angle intermediate state to a folded state, the rotation speed of the first door panel 321 relative to the main shaft 31 can be reduced to avoid the rotation of other structural parts in the rotating mechanism 32 that rotate relative to the main shaft 31 (such as the swinging part 322, the linkage part 324, etc.).

[0260] It should be noted that when the structural design of the linkage member 324, the sliding matching mode between the linkage member 324 and the connecting member 323 and the main shaft 31, and the sliding matching mode between the connecting member 323 and the first door panel 321 are different, the distribution mode of the second bending section 3232, the second turning line position of the second bending section 3232, the extension trend and extension length of the second bending section 3232, etc. can be selected and set according to the actual structural design and matching mode design. In the actual design of the hinge assembly 30, the extension trend and groove shape of the second guide groove 3231 can also be adjusted with the help of the above-mentioned simulation test to obtain the sliding track of the first door panel 321 under different designs of the second guide groove 3231, and then the required second guide groove 3231 is obtained to achieve the required structural design of the hinge assembly 30.

[0261] Exemplarily, the second guide groove 3231 can be located on the connecting member 323, and the second guide member 3241 is arranged on the linkage member 324. The linkage member 324 has a smaller spatial dimension than the connecting member 323, so that the second guide member 3241 is located on the linkage member 324, and the second guide groove 3231 is located on the connecting member 323, so as to facilitate the rational use of the structure of the linkage member 324 and the connecting member 323, reduce the difficulty of the structural design of the second guide member 3241 and the second guide groove 3231, and reduce the structural design complexity of the entire hinge assembly 30.

[0262] For example, combined with Fig.21 As shown, a second mounting seat 3235 may be provided on the connecting member 323, such as a second mounting seat 3235 provided with a protrusion on one end of the connecting member 323 along the axial direction of the main shaft. A second guide groove 3231 may be provided on the second mounting seat 3235. The second guide groove 3231 cooperates with the second guide member 3241 on the linkage member 324, so that the space in the axial direction of the main shaft is reasonably utilized, which is conducive to improving the integration of the entire hinge assembly.

[0263] Exemplarily, the linkage member 324 may include a first linkage portion 3242 and a second linkage portion 3243. A second gap is provided between at least a portion of the first linkage portion 3242 and the second linkage portion 3243.

[0264] It should be noted that the first linkage part 3242 and the second linkage part 3243 together constitute a linkage part 324, and the first linkage part 3242 and the second linkage part 3243 may not be directly connected, such as the first linkage part 3242 as a whole and the second linkage part 3243 as a whole both have the second gap, the first linkage part 3242 and the second linkage part 3243 may respectively cooperate with the main shaft to rotate, and the first linkage part 3242 and the second linkage part 3243 may respectively have linkage structures for realizing linkage.

[0265] Alternatively, in some examples, the first linkage portion 3242 and the second linkage portion 3243 are partially connected, and a gap exists between a portion of the first linkage portion 3242 and a portion of the second linkage portion 3243 .

[0266] A third jack and a fourth jack (not shown) are respectively provided on the first linkage part 3242 and the second linkage part 3243. For example, the third jack may be a through hole penetrating the first linkage part 3242 along the axial direction of the main shaft, and the fourth jack may be a through hole penetrating the second linkage part 3243 along the axial direction of the main shaft.

[0267] Combination Fig. 20 As shown, at least part of the second mounting seat 3235 can be inserted into the second gap between the first linkage portion 3242 and the second linkage portion 3243. The second guide rail member 3241 can be inserted into the second guide rail groove 3231. For example, the second guide rail member 3241 can be a pin, and the second guide rail member 3241 can be inserted into the second guide rail groove 3231 and can slide along the second guide rail groove 3231.

[0268] The two ends of the second guide rail member 3241 can be fixed in the third and fourth sockets respectively, so that the second guide rail member 3241 can be fixedly assembled with the linkage member 324 and can slide along the second guide rail groove 3231. Under the condition of sliding fit between the linkage member 324 and the connecting member 323, the integration of the assembly of the linkage member 324 and the connecting member 323 is further improved, which is convenient for thinning the entire hinge assembly. In addition, the structural design is simple, and the influence on the structural fit and transmission design between the linkage member 324 and the main shaft 31 is small, which is convenient for production and assembly.

[0269] Of course, in some other examples, the second guide rail groove 3231 may be provided on the linkage member 324 , and the second guide rail member 3241 may be provided on the connecting member 323 .

[0270] Continue to see Fig.21 As shown, the connecting member 323 and the first door panel 321 are rotatably matched through the arc-shaped sliding groove 3234 and the arc-shaped sliding wall 3218. For example, the first door panel 321 may be provided with an arc-shaped sliding wall 3218, and the connecting member 323 may be provided with an arc-shaped sliding groove 3234. Exemplarily, the connecting member 323 may be provided with arc-shaped sliding grooves 3234 at both ends along the axial direction of the main shaft, and the first door panel 321 may be provided with a plurality of arc-shaped sliding walls 3218, which is conducive to improving the stability of the rotation of the connecting member 323.

[0271] In some examples, the connecting member 323 has a second mounting seat at one axial end, the arcuate groove 3234 on the axial end of the connecting member 323 can be formed by using the second mounting seat 3235, and the arcuate groove 3234 on the other axial end of the connecting member 323 can be a through groove opened on the other end of the connecting member 323.

[0272] For example, see Fig.21 As shown, the connecting member 323 may have a protrusion 3236 on one end along the main shaft axis, and the protrusion 3236 may be located on the end surface of the connecting member 323 along the main shaft axis and protrude in the axial direction. The protrusion 3236 may be located on one side of the second mounting seat 3235, and an arc-shaped slide groove 3234 may be formed between the protrusion 3236 and the second mounting seat 3235. The arc-shaped slide groove 3234 is formed by reasonably utilizing the second mounting seat 3235 on the connecting member 323, which is conducive to improving the compactness of the assembly of the connecting member 323, the linkage member 324, and the first door panel 321, and is easy to implement by simplifying the structural design of the connecting member 323.

[0273] The first assembly surface 3212 of the first door panel 321 may be provided with an arcuate sliding wall 3218, which may be protrudingly provided on the first assembly surface 3212. The arcuate sliding wall 3218 of the first door panel 321 may be inserted into the arcuate sliding groove 3234 of the connecting member 323 and slide along the arcuate sliding groove 3234.

[0274] Alternatively, in some other examples, an arcuate sliding groove 3234 may be formed on the first door panel 321, and an arcuate sliding wall 3218 may be provided on the connecting member 323. Alternatively, in some other examples, the connecting member 323 and the first door panel 321 may be rotationally matched in other ways, such as a shaft-hole matching way.

[0275] In the embodiment of the present application, taking the first door panel 321 having an arc-shaped sliding wall 3218, the connecting member 323 having an arc-shaped sliding groove 3234 and a second guide groove 3231, and the linkage member 324 having a second guide member 3241 as an example, the design of the groove body shape and extension direction of the second guide groove 3231 is illustrated.

[0276] For example, see Fig. 22As shown, the second guide rail portion 3231b of the second guide rail groove 3231 may include two second bending segments 3232. For example, the two second bending segments 3232 may be a first sub-bending segment 3232a and a second sub-bending segment 3232b, respectively. The third end 3231a, the first sub-bending segment 3232a, the second sub-bending segment 3232b and the fourth end 3231c are sequentially connected to form the second guide rail groove 3231. The first sub-bending segment 3232a includes a second turning line L2, and the extension trend of the first sub-bending segment 3232a turns at the position of the second turning line L2. The second sub-bending segment 3232b includes a second turning line L3, and the extension trend of the second sub-bending segment 3232b turns at the position of the second turning line L3.

[0277] Fig.23 for Fig. 22 A schematic front view of the cross section of the middle hinge assembly at the position of the second guide rail groove when the middle hinge assembly is in a flattened state.

[0278] Combination Fig.23 As shown, the vertical projection of the second turning line L2 of the first sub-bending segment 3232a in the axial direction is the turning point o2, and the vertical projection of the second turning line L3 of the second sub-bending segment 3232b in the axial direction is the turning point o3. The extension trend of the part of the second rail portion 3231b between the third end 3231a and the second turning line (at the turning point o2) of the first sub-bending segment 3232a and the extension trend of the part of the second rail portion 3231b between the second turning line (at the turning point o2) of the first sub-bending segment 3232a and the second turning line (at the turning point o3) of the second sub-bending segment 3232b are changed at the second turning line (turning point o2). The extension trend of the portion of the second guide rail portion 3231b between the second turning line of the first sub-bending segment 3232a (at the turning point o2) and the second turning line of the second sub-bending segment 3232b (at the turning point o3) and the extension trend of the portion of the second guide rail portion 3231b between the second turning line of the second sub-bending segment 3232b (at the turning point o3) and the fourth end portion 3231c change at the second turning line (turning point o3).

[0279] For example, when the hinge assembly 30 is in a flattened state, in the direction of the second turning line (at the turning point o2) from the third end 3231a to the first sub-bending section 3232a, the second guide rail portion 3231b is inclined toward the first assembly surface 3212 close to the main axis 31 and away from the first door panel 321, that is, the portion of the second guide rail portion 3231b located between the third end 3231a and the second turning line (at the turning point o2) of the first sub-bending section 3232a gradually approaches the main axis 31 and inclines away from the first assembly surface 3212.

[0280] In the direction from the second turning line (at the turning point o2) of the first sub-bending section 3232a to the second turning line (at the turning point o3) of the second sub-bending section 3232b, the second guide rail portion 3231b gradually approaches the main shaft 31 and tilts away from the first assembly surface 3212 of the first door panel 321, that is, the portion of the second guide rail portion 3231b located between the second turning line (at the turning point o2) of the first sub-bending section 3232a and the second turning line (at the turning point o3) of the second sub-bending section 3232b gradually approaches the main shaft 31 and tilts away from the first assembly surface 3212. Moreover, the portion of the second guide rail portion 3231b located between the second turning line (at the turning point o2) and the second turning line (at the turning point o3) of the second sub-bending section 3232b has a greater inclination relative to the first assembly surface 3212, and the inclination extending direction is steeper.

[0281] In the direction from the second turning line (at the turning point o3) of the second sub-bending section 3232b to the fourth end 3231c, the second guide rail portion 3231b is inclined toward the direction close to the main shaft 31 and toward the first assembly surface 3212 of the first door panel 321, that is, the part of the second guide rail portion 3231b located between the second turning line (at the turning point o3) of the second sub-bending section 3232b and the fourth end 3231c gradually approaches the main shaft 31 and inclines toward the first assembly surface 3212. The extension trend of the portion of the second guide rail portion 3231b located between the second turning line (at the turning point o3) of the second sub-bending segment 3232b and the fourth end portion 3231c can be opposite to the extension trend of the portion of the second guide rail portion 3231b located between the second turning line (at the turning point o2) of the first sub-bending segment 3232a and the second turning line (at the turning point o3) of the second sub-bending segment 3232b, so that the overall groove body of the second guide rail groove 3231 can be formed in an S-shape.

[0282] When the rotating mechanism 32 rotates relative to the main shaft 31, the hinge assembly 30 is Fig.23 When the flattened state is switched to an intermediate state with a small angle, such as switching to an intermediate state with an unfolding angle of 10°, the linkage 324 slides relative to the connecting member 323, such as the second guide rail member 3241 of the linkage 324 can slide from the third end 3231a along the second guide rail groove 3231 to the second turning line (turning point o2) of the first sub-bending segment 3232a. During the sliding process, the linkage 324 drives the connecting member 323 to rotate, and drives the first door panel 321 to rotate through the connecting member 323, so that the inclination of the part of the second guide rail portion 3231b between the third end 3231a and the second turning line (at the turning point o2) is relatively small, which is beneficial to the rotation of the first door panel 321, so that the rotation speed of the first door panel 321 is faster, and the first door panel 321 can better pull the flexible screen to increase the gap between the flexible screen and the main shaft 31.

[0283] When the rotating mechanism 32 continues to rotate, causing the hinge assembly 30 to switch from an intermediate state with a small angle to an intermediate state with a larger angle (such as greater than 150°), the second guide rail member 3241 of the linkage member 324 can slide from the second turning line (turning point o2) of the first sub-bending segment 3232a to the second turning line (turning point o3) of the second sub-bending segment 3232b.

[0284] When the rotating mechanism 32 continues to rotate and the hinge assembly 30 switches to the folded state, the second guide rail member 3241 of the linkage member 324 can slide from the second turning line (turning point o3) of the second sub-bending segment 3232b to the fourth end 3231c, so that the extension trend of the part of the second guide rail portion 3231b between the second turning line (turning point o3) of the second sub-bending segment 3232b and the part of the second guide rail portion 3231b between the second turning line (turning point o2) of the first sub-bending segment 3232a and the second turning line (turning point o3) of the second sub-bending segment 3232b is opposite, and the speed of the first door panel 321 can be adjusted to make the rotation speed of the first door panel 321 relatively small to avoid the rotation of other structural members. When the hinge assembly 30 is in the folded state, the second guide rail member 3241 is located at the fourth end 3231c.

[0285] Exemplarily, the second guide groove 3231 may further include a transition section 3233, and the transition section 3233 may be located between the first sub-bending section 3232a and the second sub-bending section 3232b. The transition section 3233 may be a linear straight section, which is conducive to reducing the structural design of the second guide groove 3231, that is, the complexity of the molding, thereby reducing the complexity of the design of the entire rotating mechanism 32, and facilitating implementation.

[0286] Of course, in some examples, the transition section 3233 may be an arc-shaped section with a certain curvature.

[0287] It should be noted that the rotation trajectory of the first door panel can be adjusted by designing the groove shape of the first guide groove and the second guide groove, so as to increase the gap between the flexible screen and the main shaft when the hinge assembly rotates to an intermediate state with a small angle. In some examples, only the first guide groove can be designed to adjust the rotation trajectory of the first door panel. For example, at least one structural member included in the hinge assembly that can slide relative to the first door panel is used as a matching member. Alternatively, at least one structural member included in the main shaft that can slide relative to the first door panel is used as a matching member. Alternatively, at least one matching member is included in the hinge assembly and the main shaft respectively, and the first guide groove is provided on one of the matching member and the first door panel to adjust the rotation trajectory of the first door panel.

[0288] Alternatively, in some examples, only the second guide groove may be designed to adjust the rotation trajectory of the first door panel. For example, a second guide groove may be provided on one of the linkage member and the connecting member to achieve indirect adjustment of the rotation trajectory of the first door panel, thereby increasing the gap between the flexible screen and the main axis when the hinge assembly rotates to an intermediate state with a small angle.

[0289] Alternatively, in some examples, the first guide groove and the second guide groove can be designed to jointly adjust the rotation trajectory of the first door panel. For example, at least one of the hinge assembly and the main shaft can include a matching piece, and the first guide groove is set on one of the matching piece and the first door panel. The second guide groove can also be set on one of the linkage piece and the connecting piece. For example, the main outer shaft can be used as a matching piece (refer to Fig.16 As shown), a first guide rail member is arranged on the main outer shaft, a first guide rail groove cooperating with the first guide rail member is formed on the first door panel, a second guide rail member can be arranged on the linkage member, a second guide rail groove is arranged on the connecting member, and the connecting member is made to cooperate with the first door panel through an arc arm and an arc slide groove.

[0290] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. The terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0291] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hinge assembly, characterized in that: It comprises a main shaft and two rotating mechanisms located on both sides of the main shaft, the two rotating mechanisms are respectively located on both sides of the main shaft, and the two rotating mechanisms are respectively rotatably connected to the main shaft; Each of the rotating mechanisms comprises a first door panel, the main shaft and at least one of each of the rotating mechanisms comprises a matching piece, one of the first door panel and the matching piece is provided with a first guide rail groove, and the other of the first door panel and the matching piece is provided with a first guide rail piece that can slide along the first guide rail groove, and the first door panel and the matching piece are slidably matched through the first guide rail groove and the first guide rail piece; The first guide rail groove comprises a first end, a first guide rail part and a second end, when the hinge assembly is in a flattened state, the first guide rail part is located at the first end, when the hinge assembly is in a folded state, the first guide rail part is located at the second end; The first guide rail portion is located between the first end portion and the second end portion, and the first guide rail portion includes at least one arc-shaped first bending section, and the first bending section is used to adjust the rotation trajectory of the first door panel relative to the main axis.

2. The hinge assembly according to claim 1, characterized in that: The rotating mechanism comprises a swinging member, one end of which is rotatably connected to the main shaft, and the matching member is the swinging member; The first guide rail member is arranged on the swing member; A first mounting seat is provided on one end of the first assembly surface of the first door panel adjacent to the main axis, and the first mounting seat is provided with the first guide rail groove.

3. The hinge assembly according to claim 2, characterized in that: The first guide rail portion includes a first bending section, and the first bending section has a first turning line; When the hinge assembly is in a flattened state, from the first end to the first turning line, the first guide rail portion is inclined toward a direction close to the main axis and facing a first assembly surface of the first door panel; From the first turning line to the second end, the first guide rail portion is inclined toward a direction close to the main axis and facing a first assembly surface of the first door panel.

4. The hinge assembly according to any one of claims 1 to 3, characterized in that: The main shaft comprises a second door panel and a main outer shaft, the first door panel and the second door panel are located on the same side of the hinge assembly, the main outer shaft is arranged on the second assembly surface of the second door panel, and the matching piece is the main outer shaft; The first guide rail member is arranged on the main outer shaft; A first mounting seat is provided on the first assembly surface of the first door panel, and the first guide rail groove is provided on the first mounting seat.

5. The hinge assembly according to claim 4, characterized in that: The first guide rail portion is an arc-shaped first bending section, and the first bending section includes a first turning line; When the hinge assembly is in a flattened state, from the first end to the first turning line, the first guide rail portion is inclined toward a direction close to the main axis and facing away from the first assembly surface of the first door panel; From the first turning line to the second end, the first guide rail portion is inclined toward a direction close to the main axis and facing a first assembly surface of the first door panel.

6. The hinge assembly according to any one of claims 1 to 3, characterized in that: Each of the rotating mechanisms further comprises a connecting member and a linkage member, wherein the connecting member and the linkage member are respectively located on the first assembly surface side of the first door panel; In each of the rotating mechanisms, the connecting member is rotationally connected to the first door panel, one end of the linkage member is rotationally matched with the main shaft, and the other end of the linkage member is slidingly matched with the connecting member; In the two rotating mechanisms, one end of the linkage member in one of the rotating mechanisms is linked and matched with one end of the linkage member in the other rotating mechanism.

7. The hinge assembly according to claim 6, characterized in that: A second guide rail groove is provided on the other end of the linkage member and one of the connecting members, and a second guide rail member that can slide along the second guide rail groove is provided on the other one of the connecting members; The second guide rail groove includes a third end, a second guide rail portion and a fourth end, when the hinge assembly is in a flattened state, the second guide rail member is located at the third end, when the hinge assembly is in a folded state, the second guide rail member is located at the fourth end; The second guide rail portion is located between the third end portion and the fourth end portion, and the second guide rail portion includes at least one arc-shaped second bending section.

8. The hinge assembly according to claim 7, characterized in that: The connecting member has a second mounting seat on one end along the axial direction of the main shaft, and the second mounting seat is provided with the second guide rail groove; The second guide rail member is arranged on the linkage member.

9. The hinge assembly according to claim 8, characterized in that: The second rail portion includes two second bending segments, the two second bending segments are respectively a first sub-bending segment and a second sub-bending segment, and the third end, the first sub-bending segment, the second sub-bending segment and the fourth end are connected in sequence; When the hinge assembly is in a flattened state, the second guide rail portion is inclined toward the direction close to the main axis and away from the first assembly surface of the first door panel from the third end to the second turning line of the first sub-bending segment, and from the second turning line of the first sub-bending segment to the second turning line of the second sub-bending segment, and from the second turning line of the second sub-bending segment to the fourth end, the second guide rail portion is inclined toward the direction close to the main axis and toward the first assembly surface of the first door panel, so that the second guide rail groove is S-shaped.

10. The hinge assembly according to claim 8, characterized in that: A protrusion is provided on one end of the connecting member, the protrusion is located on one side of the second mounting seat, and an arc-shaped sliding groove is formed between the protrusion and the second mounting seat; An arc-shaped sliding wall is protruded on the first assembly surface of the first door panel, and the arc-shaped sliding wall slides along the arc-shaped sliding groove.

11. A hinge assembly, characterized in that: It comprises a main shaft and two rotating mechanisms located on both sides of the main shaft, the two rotating mechanisms are respectively located on both sides of the main shaft, and the two rotating mechanisms are respectively rotatably connected to the main shaft; Each of the rotating mechanisms comprises a first door panel, a connecting member and a linkage member, wherein the connecting member and the linkage member are respectively located on the first assembly surface side of the first door panel, the connecting member is rotationally connected to the first door panel, one end of the linkage member is rotationally matched with the main shaft, and the other end of the linkage member is slidingly matched with the connecting member; In the two rotating mechanisms, one end of the linkage member in one of the rotating mechanisms is linked with one end of the linkage member in the other rotating mechanism; A second guide rail groove is provided on the other end of the linkage member and one of the connecting members, and a second guide rail member that can slide along the second guide rail groove is provided on the other one of the connecting members; The second guide rail groove includes a third end, a second guide rail portion and a fourth end, when the hinge assembly is in a flattened state, the second guide rail member is located at the third end, when the hinge assembly is in a folded state, the second guide rail member is located at the fourth end; The second guide rail portion is located between the third end portion and the fourth end portion, and the second guide rail portion includes at least one arc-shaped second bending section, and the second bending section is used to adjust the rotation trajectory of the first door panel relative to the main axis.

12. A foldable electronic device, characterized in that: It comprises at least two middle frames and the hinge assembly according to any one of claims 1 to 10; Or, comprising at least two middle frames and the hinge assembly according to claim 11; The two middle frames are respectively located on two sides of the hinge assembly, and the two middle frames are rotatably connected through the hinge assembly.

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