Hinge assembly and electronic device

Abstract

A hinge assembly (100) and an electronic device. The hinge assembly (100) comprises a base (10), a first swing arm (20), a second swing arm (30), and a synchronous sliding block (40). A first rotating portion (21) of the first swing arm (20) is rotatably connected to the base (10), and the first rotating portion (21) is provided with a first helical groove (22). A second rotating portion (31) of the second swing arm (30) is rotatably connected to the base (10), and the second rotating portion (31) is provided with a second helical groove (32). The synchronous sliding block (40) can slide relative to the base (10), the synchronous sliding block (40) has a first protruding portion (41) slidably connected in the first helical groove (22), and also has a second protruding portion (42) slidably connected in the second helical groove (32). When the first swing arm (20) and the second swing arm (30) are in a fully extended state, surfaces of the first rotating portion (21) and the second rotating portion (31) facing a screen are planar structures; and / or, surfaces of the first protruding portion (41) and the second protruding portion (42) facing the screen are planar structures. The small size of a gap formed by parts in the hinge assembly (100) which enable the synchronous operation of the first swing arm (20) and the second swing arm (30) allows for improved support provided by the hinge assembly (100) to the screen (400), and ensures that the screen (400) has a better impact resistance.

Description

Hinge assembly and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202411381451.4, filed on September 29, 2024, and entitled "Hinge assembly and electronic device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of hinge assemblies, and more particularly, to a hinge assembly for a foldable electronic device. BACKGROUND

[0003] A foldable electronic device generally has two sets of housings connected together through a hinge assembly to realize relative rotation, so that the foldable electronic device can switch between a folded state and an unfolded state. The hinge assembly generally includes a synchronization mechanism for realizing the synchronization of the relative rotation of the two sets of housings.

[0004] In the related art, the gap between the parts used to constitute the synchronization mechanism is large, which makes the support of the screen poor, resulting in poor impact resistance of the screen at the synchronization mechanism. SUMMARY

[0005] The present application aims to provide a hinge assembly and an electronic device, wherein the gap formed by the parts used to realize the swing arm synchronization function is small, thereby improving the support of the screen by the hinge assembly and ensuring that the screen has better impact resistance.

[0006] In a first aspect, the present application provides a hinge assembly, comprising a base, a first swing arm, a second swing arm, and a synchronization slider.

[0007] The first swing arm has a first rotating part rotatably connected to the base, and the first rotating part is provided with a first spiral groove extending in a first direction.

[0008] The second swing arm has a second rotating part rotatably connected to the base, and the second rotating part is provided with a second spiral groove extending in the first direction.

[0009] The synchronization slider is slidable relative to the base in the first direction, and the synchronization slider has a first protrusion slidably connected to the first spiral groove and a second protrusion slidably connected to the second spiral groove; under the action of the synchronization slider, the first swing arm and the second swing arm can be synchronously rotated and switched between a folded state and an unfolded state.

[0010] When the first swing arm and the second swing arm are in the unfolded state, the first rotating part and the second rotating part are in a planar structure towards the surface of the screen; and / or the first convex part and the second convex part are in a planar structure towards the surface of the screen.

[0011] In the hinge assembly in the present application, when the first swing arm and the second swing arm are in the unfolded state, the first rotating part, the first convex part, the second rotating part and the second convex part can all be in a planar structure or partially in a planar structure towards the surface of the screen. In comparison with the hinge assembly in the related art, the contact area of the components used to realize the synchronization function in the hinge assembly in the present application is larger, so that the hinge assembly and the screen can realize more sufficient contact, thereby forming a good support for the screen. Moreover, the gap between the components on the side of the hinge assembly used to support the screen is smaller, so that there are less parts in the air on the screen, thus the impact resistance of the screen can be ensured. When the hinge assembly in the present application is used in the foldable electronic device, the screen can maintain its mechanical structure well under various external impact forces during the drop ball test and the pen drop test, and can exhibit good impact resistance.

[0012] In addition, since the first rotating part, the first convex part, the second rotating part and the second convex part can all be in a planar structure or partially in a planar structure towards the surface of the screen, the thickness of the components is actually increased, thereby not only increasing the structural strength of the components themselves, but also increasing the setting area of the spiral surface if the rotating part and the convex part are matched by the spiral surface, and further improving the stability of the spiral surface matching between the components and reducing the wear of the spiral surface. When the hinge assembly in the present application is used in the foldable electronic device, this is helpful to improve the hand feeling of the user when folding the shell.

[0013] In a possible design, when the first swing arm and the second swing arm are in the unfolded state, the first rotating part, the second rotating part, the first convex part and the second convex part are coplanar towards the surface of the screen.

[0014] The four parts are in the same plane towards the surface of the screen. In this way, the rotating part and the convex part can avoid irregular structures such as convex ridges towards the surface of the screen, so that the rotating part and the convex part can form a uniform and flat support surface for the screen. When the screen is impacted, the impact force can be uniformly transmitted to the hinge assembly, so as to avoid the local position of the support surface formed by the rotating part and the convex part from having excessive pressure to pierce or damage the screen.

[0015] In a possible design, the first avoiding slot is arranged at a position adjacent to the first protrusion, and the second avoiding slot is arranged at a position adjacent to the second protrusion. The first rotating part includes a first member and a second member, and the first member and the second member are respectively provided with a first helical surface and a second helical surface for enclosing a first helical groove. The second rotating part includes a third member and a fourth member, and the third member and the fourth member are respectively provided with a third helical surface and a fourth helical surface for enclosing a second helical groove. When the first swing arm and the second swing arm are in the folded state, part of the first member extends into the first avoiding slot, and part of the third member extends into the second avoiding slot.

[0016] By designing the first avoiding slot and the second avoiding slot on the synchronous slider, the synchronous slider can avoid the first member and the third member when the first swing arm and the second swing arm are rotated to the folded state. Compared with the related art, when solving the same interference problem, the first member and the third member do not need to be provided with an opening, so that the integrity of the first member and the third member can be ensured, the number of gaps of the hinge assembly is small when the first swing arm and the second swing arm are in the unfolded state, the part in the suspended state on the screen can be reduced, and the screen can be better supported to improve the impact resistance of the screen.

[0017] In a possible design, when the first swing arm and the second swing arm are in the folded state, the first member abuts against the slot wall of the first avoiding slot, and the third member abuts against the slot wall of the second avoiding slot.

[0018] The synchronous slider has a "one for three" effect, that is, the first swing arm and the second swing arm can be synchronously rotated, the folding angle of the first swing arm and the second swing arm can be controlled to avoid overfolding of the first swing arm and the second swing arm, and the impact resistance of the hinge assembly can be improved. Because the first swing arm and the second swing arm can abut against the synchronous slider, the impact force borne by the first swing arm and the second swing arm can be transmitted to the base through the synchronous slider, so that a stress point is added, and the local part of the base is prevented from being damaged due to excessive pressure.

[0019] In a possible design, the first avoiding slot has a wedge-shaped cross section, the first member includes a first plane and a second plane obliquely arranged relative to the first plane, the first plane faces the screen when the first swing arm is in the unfolded state, and the second plane abuts against the slot wall of the first avoiding slot when the first swing arm is in the folded state. The second avoiding slot has a wedge-shaped cross section, the third member includes a third plane and a fourth plane obliquely arranged relative to the third plane, the third plane faces the screen when the second swing arm is in the unfolded state, and the fourth plane abuts against the slot wall of the second avoiding slot when the second swing arm is in the folded state.

[0020] The design makes the second plane similar to the inclined strut structure in the field of building, and enables the first component to have higher support strength, and also does not make the body of the first component too thick, so that the first avoiding slot does not need to be too large, and the general outline similar to the first component can meet the avoiding requirement, thereby ensuring the body thickness and structural strength of the synchronous slider at the first avoiding slot.

[0021] In addition, when the first swing arm is in the folded state, the second plane of the first component abuts against the slot wall of the first avoiding slot with a wedge-shaped cross section, which enables effective surface contact between the first component and the synchronous slider, and enables the first component to uniformly transmit the impact force to the synchronous slider, so as to avoid local excessive pressure and damage to the first component or the synchronous slider, thereby ensuring the impact strength of the hinge assembly. Correspondingly, the technical principles of the third component and the second avoiding slot are similar, and are not described here.

[0022] In a possible design, the first plane and the second plane are connected by a chamfer; and the third plane and the fourth plane are connected by a chamfer.

[0023] The first plane and the second plane of the first component are connected by a chamfer, so as to avoid the end of the first component being in a sharp "blade" structure, thereby avoiding the first component cutting or piercing the screen. Correspondingly, the technical principles of the third component are similar, and are not described here.

[0024] In a possible design, the first protrusion has two fifth helical surfaces arranged opposite to each other in the first direction, and the two fifth helical surfaces are respectively matched with the first helical surface and the second helical surface; and the second protrusion has two sixth helical surfaces arranged opposite to each other in the first direction, and the two sixth helical surfaces are respectively matched with the slot walls of the third helical surface and the fourth helical surface.

[0025] In this way, the first protrusion and the slot wall of the first helical groove, and the second protrusion and the slot wall of the second helical groove can be tightly and fully contacted with each other, thereby ensuring that the torque of the synchronous slider can be accurately transmitted.

[0026] In a possible design, the first swing arm includes a first sub-swing arm and a second sub-swing arm spliced with each other, the first component is arranged on the first sub-swing arm, and the second component is arranged on the second sub-swing arm, and the first component and the second component form a first rotating part after splicing. The second swing arm includes a third sub-swing arm and a fourth sub-swing arm spliced with each other, the third component is arranged on the third sub-swing arm, and the fourth component is arranged on the fourth sub-swing arm, and the third component and the fourth component form a second rotating part after splicing.

[0027] The first swing arm and the second swing arm are designed in a detachable form, which is easier to assemble the first protrusion to the first helical groove and the second protrusion to the second helical groove.

[0028] In a possible design, one of the first sub-pivot arm and the second sub-pivot arm is provided with a first positioning pin, and the other is provided with a first positioning hole. One of the third sub-pivot arm and the fourth sub-pivot arm is provided with a second positioning pin, and the other is provided with a second positioning hole.

[0029] The first sub-pivot arm and the second sub-pivot arm can be quickly aligned when they are assembled together, and the third sub-pivot arm and the fourth sub-pivot arm can be quickly aligned when they are assembled together.

[0030] In a possible design, the surfaces of the first rotating part and the second rotating part opposite to each other are flat when the first pivot arm and the second pivot arm are in the unfolded state.

[0031] The thickness of the body of the first rotating part and the second rotating part is further increased, thereby increasing the structural strength of the body, and the setting area of the helical surface is also increased, thereby improving the stability of the helical surface of the convex part.

[0032] In a possible design, the surfaces of the first convex part and the second convex part opposite to the screen are flat, and the surfaces of the first convex part and the second convex part opposite to each other are flat.

[0033] The thickness of the body of the first convex part and the second convex part is further increased, thereby increasing the structural strength of the body, and the setting area of the helical surface is also increased, thereby improving the stability of the helical surface of the rotating part.

[0034] In a possible design, the base includes an upper base for supporting the screen, and the upper base is provided with a first notch and a second notch. When the first pivot arm and the second pivot arm are in the unfolded state, the surfaces of the first rotating part and the first convex part facing the screen have a step difference of 0-1 mm with the surface of the upper base having the first notch, and the surfaces of the second rotating part and the second convex part facing the screen have a step difference of 0-1 mm with the surface of the upper base having the second notch.

[0035] In a possible design, the side of the synchronous slider opposite to the screen is provided with a groove, and the groove penetrates through the synchronous slider along the first direction.

[0036] When the synchronous slider slides, the groove can avoid other components on the base, or the groove can also form a sliding fit with the slide bar on the base to guide the synchronous slider.

[0037] In a possible design, the base is provided with a first connecting shaft and a second connecting shaft, the first rotating part is provided with a shaft hole rotationally connected with the first connecting shaft, and the second rotating part is provided with a shaft hole rotationally connected with the second connecting shaft.

[0038] The specific design of the rotationally connecting the first pivot arm and the second pivot arm with the base is given, which has the advantages of simple structure and good stability.

[0039] In a possible design, the first convex part is provided with a through hole in sliding connection with the first connecting shaft, and the second convex part is provided with a through hole in sliding connection with the second connecting shaft.

[0040] A specific design is given in which the synchronous slider is in sliding connection with the base, and has the advantage of compact structure.

[0041] In a second aspect, the present application also provides an electronic device including the hinge assembly of any one of the above.

[0042] The electronic device in the present application can provide good support for the screen due to the inclusion of the hinge assembly, and can ensure the impact resistance of the screen. When the drop ball test and pen drop test are performed, the screen can maintain its mechanical structure well under various external impact forces, and can exhibit good impact resistance.

[0043] In addition, the parts or all parts for performing the synchronization function in the hinge assembly have large structural strength, and if the parts are in screw surface cooperation, the setting area of the screw surface is also increased, thereby improving the stability of the screw surface cooperation between the parts and reducing the wear of the screw surface, which helps to improve the hand feeling of the user when folding the shell.

[0044] In a possible design, the electronic device further includes a first shell, a second shell, and a screen, the hinge assembly is connected between the first shell and the second shell, and the screen is arranged on one side of the first shell, the hinge assembly, and the second shell.

[0045] In a possible design, when the first swing arm and the second swing arm are in the folded state, the screen is located on the inner side of the first shell and the second shell. BRIEF DESCRIPTION OF DRAWINGS

[0046] FIG. 1 is an exploded schematic view of a screen and a shell of a foldable mobile phone according to an embodiment of the present application;

[0047] FIG. 2 is a schematic view of a foldable mobile phone in an unfolded state according to an embodiment of the present application;

[0048] FIG. 3 is a schematic view of a foldable mobile phone in a folded state according to an embodiment of the present application;

[0049] FIG. 4 is a partial schematic view of a hinge assembly in the related art;

[0050] FIG. 5 is a schematic view of a synchronous slider in the related art;

[0051] FIG. 6 is a schematic view of a hinge assembly in the related art when supporting a screen;

[0052] FIG. 7 is a schematic view of a hinge assembly according to an embodiment of the present application;

[0053] Fig. 8 is a partial schematic view of the hinge assembly in Fig. 7;

[0054] Fig. 9 is a schematic view of the hinge assembly in Fig. 8 with the upper base and the door panel hidden;

[0055] Fig. 10 is an exploded view of the hinge assembly in Fig. 9;

[0056] Fig. 11 is a schematic view of a first swing arm and a second swing arm according to an embodiment of the present application;

[0057] Fig. 12 is a schematic view of a second sub-swing arm and a fourth sub-swing arm in Fig. 11;

[0058] Fig. 13 is a schematic view of a first sub-swing arm and a third sub-swing arm in Fig. 11;

[0059] Fig. 14 is a schematic view of a synchronization slider according to an embodiment of the present application;

[0060] Fig. 15 is a schematic view of the synchronization slider in Fig. 14 from another perspective;

[0061] Fig. 16 is a schematic view of the hinge assembly according to an embodiment of the present application when supporting a screen;

[0062] Fig. 17 is a partial schematic view of the hinge assembly in Fig. 8;

[0063] Fig. 18 is a cross-sectional view of the hinge assembly according to an embodiment of the present application in a flat state;

[0064] Fig. 19 is a cross-sectional view of the hinge assembly according to an embodiment of the present application in a folding process;

[0065] Fig. 20 is a cross-sectional view of the hinge assembly according to an embodiment of the present application in a folded state;

[0066] Fig. 21 is an enlarged view of A in Fig. 18;

[0067] Fig. 22 is an enlarged view of B in Fig. 20.

[0068] Label: 01, base; 02, notch; 03, protrusion; 04, spiral groove; 05, swing arm; 06, gap; 07, synchronous slider; 08, door plate; 10, base; 11, upper base; 111, first notch; 112, second notch; 12, lower base; 13, first connecting shaft; 14, second connecting shaft; 20, first swing arm; 21, first rotating part; 211, first member; 211a, first helical surface; 211b, first plane; 211c, second plane; 212, second member; 212a, second helical surface; 22, first spiral groove; 23, first sub swing arm; 231, first positioning pin; 24, second sub swing arm; 241, first positioning hole; 25, strip-shaped slider; 30, second swing arm; 31, second rotating part; 311, third member; 311a, third helical surface; 312, fourth member; 312a, fourth helical surface; 32, second spiral groove; 33, third sub swing arm; 331, second positioning pin; 34, fourth sub swing arm; 341, second positioning hole; 40, synchronous slider; 41, first protrusion; 411, fifth helical surface; 42, second protrusion; 421, sixth helical surface; 43, groove; 44, first avoiding groove; 45, second avoiding groove; 51, door plate; 52, shaft cover; 53, connecting block; 531, strip-shaped sliding groove; 54, main swing arm; 57, cam support; 56, elastic member; 100, hinge assembly; 200, first housing; 300, second housing; 400, screen. DETAILED DESCRIPTION

[0069] The related content that the embodiments of the present application can involve is exemplarily introduced below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0070] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the description of the present application, it should be understood that the terms "upper", "lower", "side", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship based on the installation, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0072] It should be further noted that the same reference signs are used to denote the same component or the same part in the embodiments of the present application. For the same parts in the embodiments of the present application, only one part or component may be labeled with a reference sign in the drawings, and it should be understood that the reference sign is also applicable to other same parts or components.

[0073] In the description of the present application, it should be noted that the term "and / or" is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone.

[0074] The flexible screen has a bendable property and has been applied to foldable electronic devices such as mobile phones, tablets, wristbands, game consoles, and wearable devices. The screen of such electronic devices can increase the display size without increasing the volume, and also has a high screen ratio and clarity. For example, taking a foldable mobile phone as an example, it can have the size of a traditional mobile phone after folding, which is convenient for carrying and storage, and can have the display size of a tablet computer after unfolding, so that the mobile phone has a large display area to improve the user's viewing experience and operation experience. These features make foldable electronic devices popular with consumers.

[0075] FIG. 1 is an exploded schematic view of a screen 400 and a housing of a foldable mobile phone according to an embodiment of the present application. FIG. 2 is a schematic view of the foldable mobile phone in a flat state according to an embodiment of the present application. FIG. 3 is a schematic view of the foldable mobile phone in a folded state according to an embodiment of the present application. In addition, in order to facilitate the description of each embodiment below, an XYZ coordinate system is established for the foldable mobile phone. Specifically, the extension direction of the rotation axis of the foldable mobile phone is defined as the Y direction, the thickness direction of the foldable mobile phone is defined as the Z direction, and the direction perpendicular to the Y direction and the Z direction is defined as the X direction.

[0076] As shown in FIGS. 1-3, the electronic device in the embodiments of the present application is taken as an example of a foldable mobile phone. The foldable mobile phone includes a first housing 200, a second housing 300, a screen 400, and a hinge assembly 100. The hinge assembly 100 is connected between the first housing 200 and the second housing 300, and the screen 400 is arranged above the first housing 200, the hinge assembly 100, and the second housing 300.

[0077] The first shell 200 and the second shell 300 are used to carry the screen 400 and protect the internal components of the foldable mobile phone. The screen 400 is fixedly connected to the first shell 200 and the second shell 300 at the two ends, respectively. The first shell 200 can be a hard shell, and the second shell 300 can also be a hard shell, so that the first shell 200 and the second shell 300 can stably support the two ends of the screen 400.

[0078] The hinge assembly 100 can deform with the folding or unfolding of the second shell 300 relative to the first shell 200, and limit the second shell 300 from separating from the first shell 200. Specifically, the opposite sides of the hinge assembly 100 are connected to the first shell 200 and the second shell 300, respectively. The hinge assembly 100 uses its own rotatable characteristics, so that the first shell 200 can be flipped relative to the second shell 300, so that the first shell 200 is folded relative to the second shell 300, or unfolded, or in a state between folding and unfolding.

[0079] The first shell 200 and the second shell 300 can be folded or unfolded relative to each other, so that the foldable mobile phone provided by the embodiments has multiple modes and can meet the use requirements of users in different scenarios. For example, as shown in FIG. 3, the first shell 200 and the second shell 300 can be folded relative to each other, so that the screen 400 can be attached to each other, and the foldable mobile phone can be switched to a closed mode. At this time, the foldable mobile phone has a smaller size, so that the user can conveniently store and carry it.

[0080] The first shell 200 and the second shell 300 are respectively provided with magnets at positions away from the hinge assembly 100. When the first shell 200 and the second shell 300 are in a folded state, the magnets on the two shells attract each other, so that the first shell 200 and the second shell 300 can be prevented from being accidentally opened, and the foldable mobile phone can be ensured to remain closed during storage and carrying.

[0081] The first shell 200 and the second shell 300 can be in a state between folding and unfolding, for example, the first shell 200 and the second shell 300 form an included angle of 90-120 degrees, so that the foldable mobile phone can be switched to a use mode that can be placed on a desktop. At this time, the first shell 200 and the screen 400 thereon can face the user, and the second shell 300 is placed on a placement surface such as a table or desk, and the second shell 300 has a function similar to a counterweight base, which can ensure that the foldable mobile phone is placed stably.

[0082] The first shell 200 and the second shell 300 can also be relatively unfolded, for example, as shown in FIG. 1, the first shell 200 and the second shell 300 form an included angle of 180 degrees, which can realize large-screen display and provide more information for the user and better use experience.

[0083] It can be understood that when the user holds the foldable mobile phone, the position where the earpiece module of the foldable mobile phone is located can be defined as the upper edge of the foldable mobile phone, the position where the microphone module of the foldable mobile phone is located can be defined as the lower edge of the foldable mobile phone, and the two sides held by the left and right hands of the user can be defined as the left and right edges of the foldable mobile phone.

[0084] In some embodiments provided in the present application, the first shell 200 and the second shell 300 are arranged in an up-down manner, so that the foldable mobile phone can be folded in an up-down manner. In another embodiment provided in the present application, the first shell 200 and the second shell 300 are arranged in a left-right manner, so that the foldable mobile phone can be folded in a left-right manner, for example, as shown in FIG. 3.

[0085] The screen 400 can be a flexible screen that is foldable as a whole, or the screen 400 can also be a combination of a flexible screen in the middle area and a rigid screen at both ends, which is not limited in the present application.

[0086] The foldable mobile phone can also include a plurality of modules, which can be accommodated in the interior of the first shell 200 and the second shell 300. The plurality of modules of the foldable mobile phone can include, but are not limited to, a mainboard, a processor, a memory, a battery, a camera module, an earpiece module, a speaker module, a microphone module, an antenna module, a sensor module, etc., and the number, type and position of the modules of the foldable mobile phone are not limited in the present application.

[0087] In the foldable mobile phone provided in the embodiments of the present application, the foldable mobile phone is taken as a two-fold structure for example, that is, the foldable mobile phone includes two shell parts (the first shell 200 and the second shell 300) and a hinge assembly 100 connected between the two shell parts; the two shell parts can be rotated towards each other to be stacked on each other in a manner that the screen 400 is attached to each other, so that the foldable mobile phone presents a two-layer form, that is, as shown in FIG. 3, at this time, the foldable mobile phone is an inward folding foldable mobile phone, that is, the screen 400 is located at the inner side of the first shell 200 and the second shell 300.

[0088] In another embodiment of the present application, the foldable mobile phone can also be a three-fold or more structure, that is, the foldable mobile phone includes three or more shell parts, and adjacent two shell parts are connected by the hinge assembly 100, and the adjacent two shell parts can be rotated to be stacked on each other or rotated away to be flat. When the foldable mobile phone is a three-fold or more structure, the hinge assembly 100 used by the foldable mobile phone can be adaptively designed according to the description of the two-fold structure of the present embodiment, which will not be repeated here.

[0089] In some embodiments of the present application, the electronic device can be a foldable tablet computer, a foldable game console, a foldable e-reader, a foldable wearable device, etc., and can also be other electronic devices with foldable function and requiring stable support for the screen 400.

[0090] As introduced above, the foldable mobile phone has a hinge assembly 100, which is not only used to connect the two side housings, but also used to support the middle position of the screen 400 to prevent the screen 400 from collapsing. In order to enable the two side housings of the foldable electronic device to rotate synchronously, the hinge assembly 100 needs to be additionally provided with a synchronous mechanism.

[0091] In the current hinge assembly, the synchronous mechanism is usually composed of a synchronous slider and a spiral groove. Due to the large gap between the parts of the synchronous mechanism in the related art, the support for the screen is poor, which will result in poor impact resistance of the screen at the synchronous mechanism. The defects of the hinge assembly in the related art will be described in detail below with reference to the drawings.

[0092] FIG. 4 is a partial schematic view of a hinge assembly in the related art. As shown in FIG. 4, in the related art, the hinge assembly on the foldable mobile phone is mainly composed of a base 01, a swing arm 05, a synchronous mechanism, and a door plate 08. The synchronous mechanism is mainly composed of a synchronous slider 07 and a spiral groove 04 formed on the swing arm 05. Limited by the thickness of the hinge assembly, the base 01 is usually provided with a gap 02 for avoiding the synchronous mechanism.

[0093] FIG. 5 is a schematic view of the synchronous slider 07 in the related art. As shown in FIG. 5, the synchronous slider 07 can slide in the axial direction of the hinge assembly relative to the base 01. The synchronous slider 07 has a protruding portion 03 on both sides, which is slidably arranged in the spiral groove 04. When any one of the swing arms 05 rotates relative to the base 01, the groove wall of the spiral groove 04 of the swing arm 05 pushes the protruding portion 03, which drives the synchronous slider 07 to slide as a whole relative to the base 01. Meanwhile, the other protruding portion 03 pushes the groove wall of the corresponding spiral groove 04, so that the other swing arm 05 rotates synchronously, thereby realizing the synchronous rotation of the two swing arms 05.

[0094] Continuing to refer to FIGS. 4-5, in the related art, the outer surface of the protruding portion 03 of the synchronous slider 07 is an arc-shaped curved surface, and the outer surface of the portion of the swing arm 05 where the helical groove 04 is arranged is also an arc-shaped curved surface. FIG. 6 is a schematic diagram of the hinge assembly in the related art when supporting the screen 400. It should be noted that FIG. 6 is only a rough effect diagram drawn to illustrate the defects of the hinge assembly in the related art. When the protruding portion 03 and the helical groove 04 are engaged, the protruding portion 03 and the swing arm 05 can be regarded as a whole. As shown in FIG. 6, when the swing arm 05 is in the unfolded state, because the outer surfaces of the portion of the swing arm 05 where the helical groove 04 is arranged and the protruding portion 03 are arc-shaped curved surfaces, only the arc top of the arc-shaped curved surfaces, i.e., the position indicated by G in FIG. 6, can form a better support for the screen 400, while larger gaps are left on both sides of G, and the screen 400 cannot be supported at the gaps, so that more of the body of the screen 400 is in a suspended state at the gaps, resulting in poor impact resistance of the screen 400. Before the whole machine is shipped, the screen 400 is usually subjected to an impact resistance test, and the test items include a ball drop test and a pen drop test, etc., and the purpose is to measure the ability of the screen 400 to maintain its mechanical structure under various external impact forces. Because of the design defects of the hinge assembly in the related art, the whole machine performs poorly when subjected to the above-mentioned impact resistance test.

[0095] Therefore, in order to solve the above technical problems, the present application provides a hinge assembly 100 and an electronic device, and the gap formed by the parts for realizing the swing arm synchronization function in the hinge assembly 100 is small, thereby improving the support of the hinge assembly 100 for the screen 400 and ensuring that the screen 400 has better impact resistance.

[0096] The technical solutions of the hinge assembly 100 used in the foldable mobile phone in the embodiments of the present application will be described in detail below.

[0097] FIG. 7 is a schematic diagram of the hinge assembly 100 provided by the embodiments of the present application. FIG. 8 is a partial schematic diagram of the hinge assembly 100 in FIG. 7. FIG. 9 is a schematic diagram of the hinge assembly 100 in FIG. 8 with the upper base 11 and the door plate 51 hidden. FIG. 10 is an exploded view of the hinge assembly 100 in FIG. 9. It should be noted that the shaft cover 52 is hidden in FIG. 10.

[0098] As shown in FIGS. 7-10, the hinge assembly 100 provided by the embodiments of the present application includes a base 10, a first swing arm 20, a second swing arm 30, and a synchronous slider 40. In addition, the hinge assembly 100 also includes a main swing arm 54, a door plate 51, a connecting block 53, a shaft cover 52, a damping assembly, etc.

[0099] The door plate 51 is mainly used for supporting the screen 400, and the number is two, and the two door plates 51 are arranged in axial symmetry relative to the hinge assembly 100, and one or more connecting blocks 53 are connected to each door plate 51 respectively. The connecting block 53 is an intermediate component, which is mainly used for connecting the door plate 51, the main swing arm 54, the first swing arm 20, the second swing arm 30 and the like. The shaft cover 52 is the outermost component of the hinge assembly 100, which can protect and decorate the internal components of the hinge assembly 100.

[0100] The base 10 can provide support and mounting positions for the first swing arm 20, the second swing arm 30, the synchronous sliding block 40 and the like. As shown in FIGS. 8-9, the base 10 includes an upper base 11 and a lower base 12 which are spliced together. The upper base 11 is located between the two door plates 51 and cooperates with the door plates 51 to support the screen 400 together. In order to reduce the overall thickness of the hinge assembly 100, the upper base 11 is also provided with a first notch 111 and a second notch 112 for avoiding the first rotating part 21 of the first swing arm 20, the second rotating part 31 of the second swing arm 30 and the convex part of the synchronous sliding block 40. The upper base 11 and the lower base 12 are respectively provided with convex arc surfaces and concave arc surfaces, and the convex arc surfaces and the concave arc surfaces can form an arc-shaped sliding groove after splicing. As shown in FIG. 10, the main swing arm 54 has an arc-shaped sliding block which is slidingly connected in the arc-shaped sliding groove, so that the main swing arm 54 can rotate relative to the base 10 and switch between the folded state and the flat state. The number of the main swing arms 54 is multiple, and the main swing arms 54 are arranged in pairs on both sides of the base 10. It can be understood that in other embodiments provided in the present application, the base 10 can also be a one-piece structure and does not need to be composed of the upper base 11 and the lower base 12 which are spliced together.

[0101] As mentioned above, the connecting block 53 is an intermediate component, which is mainly used for connecting the door plate 51, the main swing arm 54, the first swing arm 20, the second swing arm 30 and the like. Taking the side of the first swing arm 20 as an example, the specific design is as follows: as shown in FIG. 10, the door plate 51 is fixedly connected with the connecting block 53 (not shown in the figure), the main swing arm 54 and the connecting block 53 are rotationally connected through a pin shaft, the connecting block 53 is provided with a strip-shaped sliding groove 531, and the two sides of the first swing arm 20 are provided with strip-shaped sliding blocks 25 which are slidingly arranged in the strip-shaped sliding groove 531, so that the connecting block 53 and the first swing arm 20 are slidingly connected, and the rotation centers of the main swing arm 54 and the first swing arm 20 relative to the base 10 are different. When the main swing arm 54 rotates and drives the connecting block 53 to rotate, the connecting block 53 drives the first swing arm 20 to rotate through the groove wall of the strip-shaped sliding groove 531. The connection mode between the door plate 51, the main swing arm 54 and the connecting block 53 on the side of the second swing arm 30 is similar to this, and will not be described here.

[0102] In addition, in order to increase the damping feeling of the foldable mobile phone when being folded, and to meet the hovering effect after folding, the hinge assembly 100 also needs to add a damping assembly. As shown in FIG. 10, the damping assembly includes an elastic member 56 and a cam bracket 57, and the first rotating part 21 of the first swing arm 20 and the second rotating part 31 of the second swing arm 30 are provided with end face teeth. When the first swing arm 20 and the second swing arm 30 rotate, the end face teeth push the cam bracket 57, and then the cam bracket 57 extrudes the elastic member 56, so as to realize the damping feeling of the user when folding the shell.

[0103] The technical solutions of the first swing arm 20, the second swing arm 30 and the synchronous slider 40 in the embodiments of the present application will be described in detail below.

[0104] FIG. 11 is a schematic view of the first swing arm 20 and the second swing arm 30 according to the embodiments of the present application. FIG. 12 is a schematic view of the second sub-swing arm 24 and the fourth sub-swing arm 34 in FIG. 11. FIG. 13 is a schematic view of the first sub-swing arm 23 and the third sub-swing arm 33 in FIG. 11. It should be noted that the first sub-swing arm 23 and the third sub-swing arm 33 in FIG. 13 are different from the view in FIG. 11.

[0105] As shown in FIGS. 11-13, the first swing arm 20 includes the first sub-swing arm 23 and the second sub-swing arm 24 which are spliced with each other, the first member 211 is arranged on the first sub-swing arm 23, the second member 212 is arranged on the second sub-swing arm 24, the first member 211 and the second member 212 are spliced to form the first rotating part 21, and the first member 211 and the second member 212 are respectively rotationally connected with the base 10. The second swing arm 30 includes the third sub-swing arm 33 and the fourth sub-swing arm 34 which are spliced with each other, the third member 311 is arranged on the third sub-swing arm 33, the fourth member 312 is arranged on the fourth sub-swing arm 34, the third member 311 and the fourth member 312 are spliced to form the second rotating part 31, and the third member 311 and the fourth member 312 are respectively rotationally connected with the base 10.

[0106] The first member 211 and the second member 212 are respectively provided with a first helical surface 211a and a second helical surface 212a, and the first helical surface 211a and the second helical surface 212a are used to enclose a first helical groove 22. The first helical groove 22 is arranged to extend spirally along a first direction, wherein the first direction is the axial direction of the hinge assembly 100, i.e. the Y direction in FIG. 11. The third member 311 and the fourth member 312 are respectively provided with a third helical surface 311a and a fourth helical surface 312a, and the third helical surface 311a and the fourth helical surface 312a are used to enclose a second helical groove 32. The second helical groove 32 is arranged to extend spirally along the first direction.

[0107] The first helical groove 22 has the same pitch as the second helical groove 32, and the first helical groove 22 has an opposite direction of rotation as the second helical groove 32. For example, if the first helical groove 22 is arranged in a clockwise direction, the second helical groove 32 is arranged in an anticlockwise direction. When the first rotating part 21 rotates and pushes the first convex part 41 through the wall of the first helical groove 22, the second convex part 42 pushes the wall of the second helical groove 32, so that the second rotating part 31 rotates in the opposite direction by the same angle relative to the base 10, thereby causing the first swing arm 20 and the second swing arm 30 to rotate synchronously relative to the base 10.

[0108] As shown in FIGS. 12-13, in an embodiment, the second sub-swing arm 24 is provided with a first positioning pin 231, and the first sub-swing arm 23 is provided with a first positioning hole 241. The fourth sub-swing arm 34 is provided with a second positioning pin 331, and the third sub-swing arm 33 is provided with a second positioning hole 341. This allows the first sub-swing arm 23 and the second sub-swing arm 24 to be quickly aligned when assembled together, and also allows the third sub-swing arm 33 and the fourth sub-swing arm 34 to be quickly aligned when assembled together. The positioning pin and the positioning hole can also be interchangeably arranged on the body. That is, in another embodiment, the first sub-swing arm 23 is provided with a first positioning pin 231, and the second sub-swing arm 24 is provided with a first positioning hole 241. The third sub-swing arm 33 is provided with a second positioning pin 331, and the fourth sub-swing arm 34 is provided with a second positioning hole 341.

[0109] The above describes an embodiment in which the first swing arm 20 is assembled by sub-swing arms, and an embodiment in which the second swing arm 30 is assembled by sub-swing arms. It should be understood that, in other embodiments, the first swing arm 20 can be a one-piece structure, and the second swing arm 30 can also be a one-piece structure, without being assembled by sub-swing arms.

[0110] FIG. 14 is a schematic view of the synchronous slider 40 according to an embodiment of the present application. FIG. 15 is another view of the synchronous slider 40 in FIG. 14.

[0111] As shown in FIGS. 14-15, the synchronous slider 40 has a first convex part 41 slidingly connected in the first helical groove 22, and the first convex part 41 has two fifth helical surfaces 411 arranged opposite to each other in the first direction, which are respectively matched with the first helical surface 211a and the second helical surface 212a. The synchronous slider 40 also has a second convex part 42 slidingly connected in the second helical groove 32, and the second convex part 42 has two sixth helical surfaces 421 arranged opposite to each other in the first direction, which are respectively matched with the wall of the third helical surface 311a and the fourth helical surface 312a.

[0112] The synchronous slider 40 can slide relative to the base 10 in the first direction. For example, the synchronous slider 40 can be slidably connected to the base 10 through a slide rail, or the synchronous slider 40 can be slidably connected to the base 10 through the first connecting shaft 13 and the second connecting shaft 14. More details can be referred to the embodiments described below. When the first swing arm 20 rotates relative to the base 10, the first helical surface 211a will push the fifth helical surface 411 to push the synchronous slider 40 to slide, and at the same time, the sixth helical surface 421 of the synchronous slider 40 will push the fourth helical surface 312a, so that the second rotating part 31 rotates, thereby driving the second swing arm 30 to rotate synchronously. When the second swing arm 30 rotates relative to the base 10, the third helical surface 311a will push the sixth helical surface 421 to push the synchronous slider 40 to slide, and at the same time, the fifth helical surface 411 of the synchronous slider 40 will push the second helical surface 212a, so that the first rotating part 21 rotates, thereby driving the first swing arm 20 to rotate synchronously. In any case, the synchronous slider 40 can drive the first swing arm 20 and the second swing arm 30 to rotate synchronously and switch between the folded state and the unfolded state.

[0113] Returning to FIG. 9, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the first rotating part 21 and the second rotating part 31 have a planar structure facing the surface of the screen 400, and the first convex part 41 and the second convex part 42 have a planar structure facing the surface of the screen 400. In this way, the first rotating part 21, the second rotating part 31, the first convex part 41, and the second convex part 42 facing the surface of the screen 400 can form good support for the screen 400, so as to ensure the impact resistance of the screen 400. How to understand the above advantages will be described in detail below with reference to the accompanying drawings.

[0114] FIG. 16 is a schematic view of the hinge assembly 100 supporting the screen 400. It should be noted that FIG. 16 only shows the general effect of the hinge assembly 100 supporting the screen 400. When the first helical groove 22 is engaged with the first rotating part 21, the first rotating part 21 and the first convex part 41 can be regarded as a whole. Similarly, the second rotating part 31 and the second convex part 42 are also combined as a whole in FIG. 16.

[0115] As shown in FIG. 16, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the first rotating part 21, the first protruding part 41, the second rotating part 31 and the second protruding part 42 are flat surfaces facing the surface of the screen 400. Thus, the first rotating part 21, the second rotating part 31, the first protruding part 41 and the second protruding part 42 can be in more sufficient contact with the screen 400. In comparison with the hinge assembly in the prior art shown in FIG. 6, the first rotating part 21, the first protruding part 41, the second rotating part 31 and the second protruding part 42 in the embodiment of the present application have a larger contact area with the screen 400, and can form a good support for the screen 400. On the side of the hinge assembly 100 used to support the screen 400, the gaps between the parts are smaller, and there are less parts hanging in the air on the screen 400. Thus, the impact resistance of the screen 400 can be ensured.

[0116] In addition, since the first rotating part 21, the first protruding part 41, the second rotating part 31 and the second protruding part 42 are flat surfaces facing the surface of the screen 400, in comparison with arc surfaces, the thickness of the bodies of the first rotating part 21, the first protruding part 41, the second rotating part 31 and the second protruding part 42 is actually increased. Not only the structural strength of the bodies is increased, but also the setting area of the helical surfaces is increased, and thus the stability of the cooperation between the helical surfaces of the first rotating part 21 and the first protruding part 41, the second rotating part 31 and the second protruding part 42 is improved. The wear of the helical surfaces is reduced, and the hand feeling of the user when folding is improved.

[0117] As shown in FIG. 11, in one embodiment provided by the present application, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the opposite surfaces of the first rotating part 21 and the second rotating part 31 are flat structures.

[0118] In the embodiment, the thickness of the bodies of the first rotating part 21 and the second rotating part 31 is further increased, and thus the structural strength of the bodies is increased. The setting area of the helical surfaces is increased, and the stability of the cooperation between the helical surfaces and the protruding parts is improved.

[0119] As shown in FIG. 14 and FIG. 15, in one embodiment provided by the present application, the surfaces of the first protruding part 41 and the second protruding part 42 facing away from the screen 400 are flat structures, and the opposite surfaces of the first protruding part 41 and the second protruding part 42 are flat structures. The surface of the first protruding part 41 and the second protruding part 42 facing away from the screen 400 can be understood as the vertically hatched surface in FIG. 15, and the opposite surfaces of the first protruding part 41 and the second protruding part 42 can be understood as the horizontally hatched surfaces in FIG. 14 and FIG. 15.

[0120] In this embodiment, the thickness of the bodies of the first protrusion 41 and the second protrusion 42 is further increased, thereby increasing the structural strength of the first protrusion 41 and the second protrusion 42, and increasing the area of the spiral surface, and improving the stability of the cooperation between the spiral surface and the spiral surface of the rotating part.

[0121] In one embodiment provided by the present application, the corner between the two adjacent surfaces of the first protrusion 41 is chamfered, which can be bevel chamfering or round chamfering, and the second protrusion 42, the first rotating part 21 and the second rotating part 31 have similar designs. In this embodiment, the above design can avoid the edges of the parts damaging the screen 400.

[0122] In another embodiment provided by the present application, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the surfaces of the first rotating part 21 and the second rotating part 31 facing the screen 400 are planar structures, and the surface types of the surfaces of the first protrusion 41 and the second protrusion 42 facing the screen 400 are not limited. Alternatively, in another embodiment provided by the present application, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the surfaces of the first protrusion 41 and the second protrusion 42 facing the screen 400 are planar structures, and the surface types of the surfaces of the first rotating part 21 and the second rotating part 31 facing the screen 400 are not limited. Compared with the related art, the side of the synchronous mechanism facing the screen 400 is arc-shaped, and in this embodiment, even if only a part of the rotating part or the protrusion is planar, the support effect on the screen 400 can be improved.

[0123] In one embodiment provided by the present application, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the surfaces of the first rotating part 21, the second rotating part 31, the first protrusion 41 and the second protrusion 42 facing the screen 400 are coplanar.

[0124] In this embodiment, the surfaces of the first rotating part 21, the second rotating part 31, the first protrusion 41 and the second protrusion 42 facing the screen 400 are planar structures, and the surfaces of the first rotating part 21, the second rotating part 31, the first protrusion 41 and the second protrusion 42 facing the screen 400 are in the same plane. Such a design can avoid the surfaces of the rotating part and the protrusion facing the screen 400 having irregular structures such as convex ridges, so that the rotating part and the protrusion can form a uniform and flat support surface for the screen 400. When the screen 400 is impacted, the impact force can be uniformly transmitted to the hinge assembly 100, so as to avoid the local position of the support surface formed by the rotating part and the protrusion having excessive pressure and piercing or damaging the screen 400.

[0125] FIG. 17 is a partial schematic view of the hinge assembly 100 in FIG. 8.

[0126] As shown in FIG. 17, in an embodiment provided by the present application, when the first swing arm 20 and the second swing arm 30 are in the unfolded state, the segment difference between the surface of the first rotating part 21 and the first convex part 41 towards the surface of the screen 400 and the surface of the upper base 11 with the first gap 111 is 0-1 mm, and the segment difference between the surface of the second rotating part 31 and the second convex part 42 towards the surface of the screen 400 and the surface of the upper base 11 with the second gap 112 is 0-1 mm.

[0127] Wherein, the surface of the first rotating part 21, the first convex part 41, the second rotating part 31 and the second convex part 42 towards the surface of the screen 400 can be understood as the surface filled with longitudinal dashed lines in FIG. 17, and the surface of the upper base 11 with the first gap 111 and the second gap 112 can be understood as the surface filled with transverse dashed lines in FIG. 17, and the segment difference between the two surfaces is 0-1 mm. When the segment difference between the two surfaces is 0, the two surfaces are in the same plane, which can form a uniform and flat supporting surface for the screen 400, thereby avoiding that the local position of the supporting surface has too large pressure to pierce or damage the screen 400. When the segment difference between the two surfaces is less than or equal to 1 mm and not equal to 0, the two surfaces can also form a better supporting effect for the screen 400.

[0128] Returning to FIG. 4, in the related art hinge assembly, in addition to the design defect that the outer surfaces of the two of the part of the swing arm 05 on which the spiral groove 04 is arranged and the convex part 03 are arc-shaped curved surfaces, the part of the swing arm 05 on which the spiral groove 04 is arranged also has a gap 06, which is to prevent the part of the swing arm 05 on which the spiral groove 04 is arranged from interfering with the synchronous slider 07 when the swing arm 05 is rotated to the folded state. However, due to the existence of the gap 06, the number of gaps of the hinge assembly is further increased, so that the overhanging position of the screen 400 is more, thereby failing to form a better support for the screen 400.

[0129] Therefore, in order to solve the above problems, as shown in FIG. 14, in an embodiment provided by the present application, the synchronous slider 40 is provided with a first avoiding slot 44 adjacent to the position of the first convex part 41, and a second avoiding slot 45 adjacent to the position of the second convex part 42. When the first swing arm 20 and the second swing arm 30 are in the folded state, part of the first member 211 extends into the first avoiding slot 44, and part of the third member 311 extends into the second avoiding slot 45.

[0130] In the embodiment, the first avoiding groove 44 and the second avoiding groove 45 are designed on the synchronous slider 40, so that the synchronous slider 40 can avoid the first member 211 and the third member 311 when the first swing arm 20 and the second swing arm 30 rotate to the folding state. Compared with the related art, when solving the same interference problem, the embodiment does not need to open the aperture on the first member 211 and the third member 311, so that the integrity of the first member 211 and the third member 311 can be ensured, the number of gaps of the hinge assembly 100 is small when the first swing arm 20 and the second swing arm 30 are in the unfolding state, the part in the suspended state on the screen 400 is reduced, so that the screen 400 is better supported, and the impact resistance of the screen 400 can be improved.

[0131] The working process of the above embodiment will be further described below with reference to the accompanying drawings.

[0132] FIG. 18 is a cross-sectional view of the hinge assembly 100 in the unfolding state according to an embodiment of the present application. As shown in FIG. 18, the first member 211 and the third member 311 are intact, and the gap between the first member 211 and the third member 311 and the upper base 11 is small, so that the screen 400 is better supported.

[0133] FIG. 19 is a cross-sectional view of the hinge assembly 100 in the folding process according to an embodiment of the present application. As shown in FIG. 19, the first swing arm 20 and the second swing arm 30 start to fold, and the first swing arm 20 and the second swing arm 30 rotate synchronously under the action of the synchronous slider 40, and drive the first member 211 and the third member 311 to rotate around the first connecting shaft 13 and the second connecting shaft 14, respectively.

[0134] FIG. 20 is a cross-sectional view of the hinge assembly 100 in the folding state according to an embodiment of the present application. As shown in FIG. 20, the first member 211 and the third member 311 can extend into the first avoiding groove 44 and the second avoiding groove 45 to avoid interference with the synchronous slider 40 when the first swing arm 20 and the second swing arm 30 are in the folding state, because the first avoiding groove 44 and the second avoiding groove 45 are designed on the synchronous slider 40.

[0135] As shown in FIG. 20, in an embodiment provided by the present application, the first avoiding groove 44 and the second avoiding groove 45 are not blindly opened, but the depth of the first avoiding groove 44 and the second avoiding groove 45 is controlled, so that the first avoiding groove 44 and the second avoiding groove 45 satisfy the condition that the first member 211 abuts against the groove wall of the first avoiding groove 44 and the third member 311 abuts against the groove wall of the second avoiding groove 45 when the first swing arm 20 and the second swing arm 30 are in the folding state.

[0136] In this way, the synchronization slider 40 has a "three-in-one" effect, that is, the first swing arm 20 and the second swing arm 30 can be synchronously rotated, the folding angle of the first swing arm 20 and the second swing arm 30 can be controlled to avoid overfolding of the first swing arm 20 and the second swing arm 30, and the impact resistance of the hinge assembly 100 is improved. When the mobile phone is fixedly connected with the door plate 51 or the connecting block 53, the impact force is transmitted from the connecting block 53 to the first swing arm 20, the second swing arm 30 and the main swing arm 54, and then transmitted to the base 10. The stress points on the base 10 are less, and the pressure is large and easy to damage. In this embodiment, the first swing arm 20 and the second swing arm 30 can also abut against the synchronization slider 40, so that the impact force on the first swing arm 20 and the second swing arm 30 can also be transmitted to the base 10 through the synchronization slider 40, thereby increasing a stress point and avoiding damage to the local part of the base 10 due to excessive pressure.

[0137] It is mentioned above that the first member 211 and the third member 311 mainly support the screen 400, and the first avoiding groove 44 and the second avoiding groove 45 are designed on the synchronization slider 40 to avoid the first member 211 and the second member 212 when the first swing arm 20 and the second swing arm 30 are rotated to the folding state. The thickness and shape of the first member 211 and the second member 212 affect the structural strength of the first member 211 and the second member 212, and in turn affect the supporting effect on the screen 400. Generally, the greater the thickness of the first member 211 and the second member 212, the greater the structural strength, and the better the supporting effect on the screen 400. Due to the limited space on the base 10, the size of the synchronization slider 40 cannot be increased without limit. After the first avoiding groove 44 and the second avoiding groove 45 are opened, the thickness and structural strength of the synchronization slider 40 will be inevitably reduced. In particular, when the thickness of the first member 211 and the second member 212 increases, the size of the first avoiding groove 44 and the second avoiding groove 45 also needs to be increased to avoid the first member 211 and the second member 212, thereby further reducing the thickness and structural strength of the synchronization slider 40.

[0138] Therefore, there is a contradiction between the supporting effect of the first member 211 and the second member 212 on the screen 400 and the structural strength of the synchronization slider 40. In order to balance this contradiction, the following embodiments limit the structure of the first avoiding groove 44, the second avoiding groove 45, the first member 211 and the third member 311, as follows.

[0139] Fig. 21 is an enlarged view of A in Fig. 18. Fig. 22 is an enlarged view of B in Fig. 20.

[0140] As shown in Figs. 21-22, in an embodiment provided by the present application, the first avoiding groove 44 is wedge-shaped in cross section, the first member 211 comprises a first plane 211b and a second plane 211c which is arranged obliquely relative to the first plane 211b, the first plane 211b faces the screen 400 when the first swing arm 20 is in the unfolded state, and the second plane 211c abuts against the groove wall of the first avoiding groove 44 when the first swing arm 20 is in the folded state. The second avoiding groove 45 is wedge-shaped in cross section, the third member 311 comprises a third plane and a fourth plane which is arranged obliquely relative to the third plane, the third plane faces the screen 400 when the second swing arm 30 is in the unfolded state, and the fourth plane abuts against the groove wall of the first avoiding groove 44 when the second swing arm 30 is in the folded state.

[0141] In the embodiment, by limiting the structures of the first avoiding groove 44, the second avoiding groove 45, the first member 211 and the third member 311 as above, the structural strength of the synchronous slider 40 can be ensured while ensuring that the first member 211 and the third member 311 have good supporting effect on the screen 400. The specific reason is that, taking the first member 211 and the first avoiding groove 44 as an example, as shown in Fig. 21, the first member 211 comprises a first plane 211b and a second plane 211c which is arranged obliquely relative to the first plane 211b. Such design makes the second plane 211c similar to the inclined strut structure in the field of architecture, so that the first member 211 has high supporting strength and the body of the first member 211 is not too thick. Therefore, the first avoiding groove 44 does not need to be too large and has a similar outline to the first member 211 to meet the avoiding requirement, thereby ensuring the body thickness and structural strength of the synchronous slider 40 at the first avoiding groove 44. Correspondingly, the technical principles of the third member 311 and the second avoiding groove 45 are similar, which will not be described here.

[0142] In addition, as shown in Fig. 22, when the first swing arm 20 is in the folded state, the second plane 211c of the first member 211 abuts against the groove wall of the wedge-shaped first avoiding groove 44, which enables effective surface contact between the first member 211 and the synchronous slider 40, so that the first member 211 can uniformly transmit the impact force to the synchronous slider 40 to avoid local excessive pressure which may cause damage to the first member 211 or the synchronous slider 40, thereby ensuring the impact resistance of the hinge assembly 100. Correspondingly, the technical principles of the third member 311 and the second avoiding groove 45 are similar, which will not be described here.

[0143] As shown in FIG. 21, in an embodiment, the first plane 211b and the second plane 211c are connected by a chamfer. The third plane and the fourth plane are connected by a chamfer.

[0144] In this embodiment, the first plane 211b and the second plane 211c of the first member 211 are connected by a chamfer, so as to avoid the end of the first member 211 being in a sharp "blade" structure, thereby avoiding the first member 211 cutting or piercing the screen 400. In addition, when the first swing arm 20 rotates around the first connecting shaft 13, the first member 211 also rotates around the first connecting shaft 13, and the rotation track of the end of the first member 211 is a circular arc. In order to avoid the end of the first member 211, an arc-shaped avoiding slot needs to be formed on the upper base 11. The first plane 211b and the second plane 211c are connected by a chamfer, so as to avoid the end of the first member 211 excessively invading the avoiding slot, so that the avoiding slot on the upper base 11 does not need to be excessively large, thereby ensuring the thickness and strength of the body of the upper base 11. Correspondingly, the third member 311 has a similar technical principle, which will not be described here.

[0145] Optionally, the chamfer can be an inclined chamfer or a round chamfer. Preferably, a round chamfer is adopted, so as to better adapt to the arc-shaped avoiding slot of the upper base 11, and compared with an inclined chamfer, a round chamfer can retain more body substrate, so as to ensure the strength of the first member 211 and the third member 311.

[0146] As described above, the first protrusion 41 has two fifth helical surfaces 411 arranged opposite to each other along the first direction, so as to make the first protrusion 41 conform to the first helical groove 22. The second protrusion 42 has two sixth helical surfaces 421 arranged opposite to each other along the first direction, so as to make the second protrusion 42 conform to the second helical groove 32. In another embodiment, the first protrusion 41 and the second protrusion 42 can also have a hemispherical structure, a cylindrical structure or the like, and the first protrusion 41 and the second protrusion 42 are respectively slidably connected in the first helical groove 22 and the second helical groove 32.

[0147] As shown in FIGS. 14 and 15, in an embodiment, the side of the synchronous slider 40 facing away from the screen 400 is provided with a groove 43, and the groove 43 penetrates the synchronous slider 40 along the first direction. Since the synchronous slider 40 needs to slide relative to the base 10 along the first direction, in this embodiment, the bottom of the synchronous slider 40 is provided with a groove 43 penetrating along the first direction. When the synchronous slider 40 slides, the groove 43 can avoid other components on the base 10, or the groove 43 can be in sliding cooperation with a sliding strip on the base 10, so as to guide the synchronous slider 40.

[0148] As shown in FIG. 10, in one embodiment provided by the present application, the base 10 is provided with a first connecting shaft 13 and a second connecting shaft 14, the first rotating part 21 is provided with a shaft hole rotatably connected with the first connecting shaft 13, and the second rotating part 31 is provided with a shaft hole rotatably connected with the second connecting shaft 14. In this embodiment, the specific design of the rotatable connection between the first swing arm 20 and the second swing arm 30 and the base 10 is given, which has the advantages of simple structure and good stability.

[0149] As shown in FIG. 10, in one embodiment provided by the present application, the first convex part 41 is provided with a through hole slidably connected with the first connecting shaft 13, and the second convex part 42 is provided with a through hole slidably connected with the second connecting shaft 14. In this embodiment, the specific design of the sliding connection between the synchronous sliding block 40 and the base 10 is given, which has the advantage of compact structure.

[0150] Finally, it should be noted that: the above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hinge assembly, characterized by The hinge assembly comprises: a base (10); a first swing arm (20) having a first rotating part (21) rotationally connected with the base (10) and provided with a first helical groove (22) extending along a first direction; the first direction is the axial direction of the hinge assembly; a second swing arm (30) having a second rotating part (31) rotationally connected with the base (10) and provided with a second helical groove (32) extending along the first direction; a synchronous slider (40) capable of sliding relative to the base (10) along the first direction, the synchronous slider (40) having a first protrusion (41) slidingly connected in the first helical groove (22) and also having a second protrusion (42) slidingly connected in the second helical groove (32); under the action of the synchronous slider (40), the first swing arm (20) and the second swing arm (30) can synchronously rotate and switch between a folded state and an unfolded state; wherein, when the first swing arm (20) and the second swing arm (30) are in the unfolded state, the first rotating part (21) and the second rotating part (31) are flat structures towards the surface of a screen (400); and / or, the first protrusion (41) and the second protrusion (42) are flat structures towards the surface of the screen (400).

2. The hinge assembly of claim 1, wherein, When the first swing arm (20) and the second swing arm (30) are in the unfolded state, the first rotating part (21), the second rotating part (31), the first protrusion (41) and the second protrusion (42) are coplanar towards the surface of the screen (400).

3. The hinge assembly of claim 1 or 2, wherein, The synchronous slider (40) is provided with a first avoiding groove (44) adjacent to the position of the first protrusion (41), and is provided with a second avoiding groove (45) adjacent to the position of the second protrusion (42); The first rotating part (21) comprises a first member (211) and a second member (212), and the first member (211) and the second member (212) are respectively provided with a first helical surface (211a) and a second helical surface (212a) for enclosing the first helical groove (22); The second rotating part (31) comprises a third member (311) and a fourth member (312), and the third member (311) and the fourth member (312) are respectively provided with a third helical surface (311a) and a fourth helical surface (312a) for enclosing the second helical groove (32); When the first swing arm (20) and the second swing arm (30) are in the folded state, part of the first member (211) extends into the first avoiding groove (44), and part of the third member (311) extends into the second avoiding groove (45).

4. The hinge assembly of claim 3, wherein, When the first swing arm (20) and the second swing arm (30) are in the folded state, the first member (211) abuts against the groove wall of the first avoiding groove (44), and the third member (311) abuts against the groove wall of the second avoiding groove (45).

5. The hinge assembly of claim 4, wherein, The first avoiding slot (44) is wedge-shaped in cross section, the first member (211) comprises a first plane (211b) and a second plane (211c) arranged obliquely relative to the first plane (211b), the first plane (211b) faces the screen (400) when the first swing arm (20) is in the unfolded state, and the second plane (211c) abuts against the slot wall of the first avoiding slot (44) when the first swing arm (20) is in the folded state; The second avoiding slot (45) is wedge-shaped in cross section, the third member (311) comprises a third plane and a fourth plane arranged obliquely relative to the third plane, the third plane faces the screen (400) when the second swing arm (30) is in the unfolded state, and the fourth plane abuts against the slot wall of the second avoiding slot (45) when the second swing arm (30) is in the folded state.

6. The hinge assembly of claim 5, wherein, The first plane (211b) and the second plane (211c) are connected by a chamfer; The third plane and the fourth plane are connected by a chamfer.

7. The hinge assembly of any one of claims 3-6, wherein, The first convex part (41) has two fifth helical surfaces (411) arranged opposite to each other in the first direction, and the two fifth helical surfaces (411) are matched with the first helical surface (211a) and the second helical surface (212a) respectively; The second convex part (42) has two sixth helical surfaces (421) arranged opposite to each other in the first direction, and the two sixth helical surfaces (421) are matched with the slot wall of the third helical surface (311a) and the fourth helical surface (312a) respectively.

8. The hinge assembly of any one of claims 3-7, wherein, The first swing arm (20) comprises a first sub-swing arm (23) and a second sub-swing arm (24) spliced with each other, the first member (211) is arranged on the first sub-swing arm (23), the second member (212) is arranged on the second sub-swing arm (24), and the first member (211) and the second member (212) form the first rotating part (21) after splicing; The second swing arm (30) comprises a third sub-swing arm (33) and a fourth sub-swing arm (34) spliced with each other, the third member (311) is arranged on the third sub-swing arm (33), the fourth member (312) is arranged on the fourth sub-swing arm (34), and the third member (311) and the fourth member (312) form the second rotating part (31) after splicing.

9. The hinge assembly of claim 8, wherein, One of the first sub-swing arm (23) and the second sub-swing arm (24) is provided with a first positioning pin (231), and the other is provided with a first positioning hole (241); One of the third sub-swing arm (33) and the fourth sub-swing arm (34) is provided with a second positioning pin (331), and the other is provided with a second positioning hole (341).

10. The hinge assembly of any one of claims 1-9, wherein, When the first swing arm (20) and the second swing arm (30) are in the unfolded state, the opposite surfaces of the first rotating part (21) and the second rotating part (31) are flat structures.

11. The hinge assembly of any one of claims 1-10, wherein, The surface of the first convex part (41) and the second convex part (42) facing away from the screen (400) is a planar structure, and the surface of the first convex part (41) and the second convex part (42) facing away from each other is a planar structure.

12. The hinge assembly of claim 2, wherein, The base (10) comprises an upper base (11) for supporting the screen (400), and the upper base (11) is provided with a first notch (111) and a second notch (112); When the first swing arm (20) and the second swing arm (30) are in the unfolded state, the surface of the first rotating part (21) and the first convex part (41) facing the screen (400) has a step difference of 0-1mm with the surface of the upper base (11) having the first notch (111), and the surface of the second rotating part (31) and the second convex part (42) facing the screen (400) has a step difference of 0-1mm with the surface of the upper base (11) having the second notch (112).

13. The hinge assembly of any one of claims 1-12, wherein, The side of the synchronous slider (40) facing away from the screen (400) is provided with a groove (43), and the groove (43) penetrates the synchronous slider (40) along the first direction.

14. The hinge assembly of any one of claims 1-13, wherein, The base (10) is provided with a first connecting shaft (13) and a second connecting shaft (14), the first rotating part (21) is provided with a rotating connection shaft hole with the first connecting shaft (13), and the second rotating part (31) is provided with a shaft hole rotatingly connected with the second connecting shaft (14).

15. The hinge assembly of claim 14, wherein, The first convex part (41) is provided with a through hole slidingly connected with the first connecting shaft (13), and the second convex part (42) is provided with a through hole slidingly connected with the second connecting shaft (14).

16. An electronic device, comprising: The hinge assembly (100) comprises the hinge assembly (100) according to any one of claims 1-15.

17. The electronic device of claim 16, wherein, The hinge assembly (100) is further connected between the first housing (200) and the second housing (300), and the screen (400) is arranged on one side of the first housing (200), the hinge assembly (100) and the second housing (300).

18. The electronic device of claim 17, wherein, When the first swing arm (20) and the second swing arm (30) are in the folded state, the screen (400) is located inside the first housing (200) and the second housing (300).

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