Hinge assembly and electronic device

Abstract

A hinge assembly, comprising a base (10), a first swing arm (20), a second swing arm (30), a synchronization assembly (40), and a damping assembly (50). The base is provided with a first connecting shaft (11) and a second connecting shaft (12); the first swing arm is rotatably connected to the first connecting shaft, and the first swing arm is provided with a first gear (22) and a first swing arm cam (21); the second swing arm is rotatably connected to the second connecting shaft, and the second swing arm is provided with a second gear (32) and a second swing arm cam (31); the synchronization assembly comprises a first idle gear (41) and a second idle gear (42); the damping assembly comprises elastic members (54) and a first bracket (51); and tooth slots of the first gear do not penetrate on the side facing the first swing arm cam, and tooth slots of the second gear do not penetrate on the side facing the second swing arm cam. While taking into account both a synchronization function and a damping function, the hinge assembly integrates some parts used for executing the synchronization function and the damping function to reduce the volume of the hinge assembly, such that the hinge assembly can meet the requirements of miniaturization and lightness and thinness of an electronic device. Also involved is an electronic device.

Description

Hinge assembly and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410738575.7, filed on June 7, 2024, and entitled “Hinge assembly and electronic device”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0003] Foldable electronic devices usually have two sets of housings connected together by a hinge assembly to realize relative rotation, so that the foldable electronic device can be switched between a folded state and an unfolded state. The hinge assembly usually includes a synchronization mechanism and a damping mechanism. The synchronization mechanism is used to realize the synchronization of the relative rotation of the two sets of housings in the same direction, and the damping mechanism is used to provide a damping force to make the user feel a proper opening and closing feeling when unfolding and folding the foldable electronic device.

[0004] Generally, the synchronization mechanism and the damping mechanism occupy a large space, resulting in a large volume of the hinge assembly, which cannot meet the development requirements of miniaturization and thinness in the industry. SUMMARY

[0005] The purpose of the present application is to provide a hinge assembly and an electronic device. The hinge assembly integrates some parts used to perform synchronization and damping functions into one, thereby reducing the volume of the hinge assembly and making the hinge assembly meet the miniaturization and thinness requirements of the electronic device.

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

[0007] The base is provided with a first connecting shaft and a second connecting shaft.

[0008] The first swing arm is rotationally connected to the first connecting shaft. The first swing arm is provided with a first gear with teeth protruding radially along the first connecting shaft, and a first swing arm cam with a protruding portion protruding axially along the first connecting shaft.

[0009] The second swing arm is rotationally connected to the second connecting shaft. The second swing arm is provided with a second gear with teeth protruding radially along the second connecting shaft, and a second swing arm cam with a protruding portion protruding axially along the second connecting shaft.

[0010] The synchronization assembly includes a first idler gear and a second idler gear. The first gear, the first idler gear, the second idler gear, and the second gear are sequentially meshed.

[0011] The damping assembly comprises the elastic member and a first support, the first support is provided with a first cam engaged with the first swing arm cam and a second cam engaged with the second swing arm cam, wherein the first support can directly or indirectly press the elastic member under the drive of the first swing arm cam and the second swing arm cam.

[0012] The tooth groove of the first gear is not through on the side facing the first swing arm cam, and the tooth groove of the second gear is not through on the side facing the second swing arm cam.

[0013] The first gear participating in the hinge synchronization function and the first swing arm cam participating in the hinge damping function are arranged on the first swing arm, so that the first gear and the first swing arm cam can be integrated into an integrated structure; the second gear participating in the hinge synchronization function and the second swing arm cam participating in the hinge damping function are arranged on the second swing arm, so that the second gear and the second swing arm cam can be integrated into an integrated structure. Compared with the split design of the synchronization gear and the damping cam in the related art, the first gear and the first swing arm cam in the present application, and the second gear and the second swing arm cam do not have a mounting distance or a separation gap, so that the occupied space of the synchronization assembly and the damping assembly in the hinge assembly can be reduced, and the hinge assembly can meet the development needs of miniaturization and thinning of foldable electronic devices.

[0014] In addition, in the hinge assembly provided in the present application, the tooth groove of the first gear on the first swing arm is not through on the side facing the first swing arm cam, which can ensure that the protruding part of the first swing arm cam has a complete face type, or in other words, the protruding part of the first swing arm cam has a complete base body, which can ensure that the protruding part of the first swing arm cam has sufficient structural strength, so that the protruding part of the first swing arm cam is not easily deformed or worn by the protruding part of the first cam when the first cam is pressed, thereby increasing the reliability of the first swing arm cam; in addition, the protruding part of the first swing arm cam has a complete face type, and the sliding contact area between the protruding part of the first swing arm cam and the protruding part of the first cam is basically stable during the entire sliding process, and the two can relatively smoothly slide, avoiding the situation that the first swing arm cam is stuck and shakes, thereby ensuring the stability of the first swing arm during folding or unfolding. Correspondingly, the second swing arm has similar working principles and technical effects as the first swing arm.

[0015] Overall, the above design reduces the size of the hinge assembly in the present application and can increase the reliability and service life of the hinge assembly. When the hinge assembly in the present application is applied to a foldable electronic device, the user can have a better opening and closing feeling when folding or unfolding the electronic device.

[0016] In a possible design, the first swing arm is provided with a third swing arm cam on the side opposite to the first swing arm cam, the third swing arm cam has a protruding part protruding in the axial direction of the first connecting shaft; the second swing arm is provided with a fourth swing arm cam on the side opposite to the second swing arm cam, the fourth swing arm cam has a protruding part protruding in the axial direction of the second connecting shaft; the damping assembly further includes a second support, the second support is provided with a third cam engaged with the third swing arm cam, and the second support is further provided with a fourth cam engaged with the fourth swing arm cam; under the drive of the third swing arm cam and the fourth swing arm cam, the second support can press the elastic element.

[0017] The hinge assembly is additionally provided with a set of damping mechanisms on the basis of the original hinge assembly, so that the damping force of the hinge assembly can be increased, the user's opening and closing feeling can be improved, and the stability and anti-vibration performance of the foldable mobile phone in the hovering state can be improved.

[0018] In a possible design, the damping assembly further includes a third support, the third support is located at the end of the elastic element opposite to the second support; one end of the first connecting shaft and the second connecting shaft is fixed to the third support, and the other end of the first connecting shaft and the second connecting shaft is fixed to the first support; under the drive of the first swing arm cam and the second swing arm cam, the first support drives the first connecting shaft and the second connecting shaft to slide relative to the base, so that the third support presses the elastic element.

[0019] The second support and the third support press the same elastic element, so that the elastic element is reused, and the influence on the size of the hinge assembly is further reduced.

[0020] In a possible design, the first swing arm is provided with a first shaft sleeve rotatably connected to the first connecting shaft, the first shaft sleeve includes a first sub-shaft sleeve and a second sub-shaft sleeve, and the first sub-shaft sleeve and the second sub-shaft sleeve have a first interval groove therebetween; the first swing arm cam and the first gear are located in the first sub-shaft sleeve, and the third swing arm cam is located in the second sub-shaft sleeve; the second swing arm is provided with a second shaft sleeve rotatably connected to the second connecting shaft, the second shaft sleeve includes a third sub-shaft sleeve and a fourth sub-shaft sleeve, and the third sub-shaft sleeve and the fourth sub-shaft sleeve have a second interval groove therebetween; the second swing arm cam and the second gear are located in the third sub-shaft sleeve, and the fourth swing arm cam is located in the fourth sub-shaft sleeve.

[0021] The swing arm is rotatably connected to the connecting shaft through the shaft sleeve, and the shaft sleeve has the feature of compact structure, so that the rotatable connection between the swing arm and the connecting shaft occupies a small space; and the two cams on the swing arm are arranged on the two sub-shaft sleeves, so that the manufacturing loss during manufacturing of the swing arm can be reduced, and the yield of the swing arm can be improved.

[0022] In a possible design, the tooth top of the first gear is coplanar with the outer surface of the first sub-shaft sleeve, and the tooth top of the second gear is coplanar with the outer surface of the third sub-shaft sleeve.

[0023] The tooth top of the first gear is prevented from sinking below the outer surface of the first sub-axle sleeve, so that the first sub-axle sleeve does not lose too much base body for forming the first gear, and the structural strength of the first sub-axle sleeve is ensured. Correspondingly, the tooth top of the second gear is prevented from sinking below the outer surface of the third sub-axle sleeve, so that the third sub-axle sleeve does not lose too much base body for forming the second gear, and the structural strength of the third sub-axle sleeve is ensured.

[0024] In a possible design, the tooth groove of the first gear is through to one side of the first interval groove, the second sub-axle sleeve has a first demolding groove, and the first demolding groove is through to one side of the first interval groove; the tooth groove of the second gear is through to one side of the second interval groove, and the fourth sub-axle sleeve has a second demolding groove, and the second demolding groove is through to one side of the second interval groove.

[0025] The first demolding groove is designed on the second sub-axle sleeve, so that the difficulty and cost of forming the first gear on the first sub-axle sleeve are reduced. Correspondingly, the second demolding groove is designed on the fourth sub-axle sleeve, so that the difficulty and cost of forming the second gear on the third sub-axle sleeve are reduced.

[0026] In a possible design, the first demolding groove is not through to one side of the third swing arm cam, and the second demolding groove is not through to one side of the fourth swing arm cam.

[0027] The above design can further increase the reliability and service life of the hinge assembly. When the hinge assembly in the embodiment of the present application is applied to a foldable mobile phone, the user can have a better opening and closing feeling when folding or unfolding the mobile phone.

[0028] In a possible design, the groove bottom of the first demolding groove is coplanar with the dedendum of the first gear, and the groove bottom of the second demolding groove is coplanar with the dedendum of the second gear.

[0029] The groove bottom of the first demolding groove is coplanar with the dedendum of the first gear, so that the first demolding groove is not too deep under the condition that the mold can be demolded, thereby avoiding that the second sub-axle sleeve loses too much base body for opening the first demolding groove, and the structural strength of the second sub-axle sleeve is ensured. Correspondingly, the groove bottom of the second demolding groove is coplanar with the dedendum of the second gear, so that the second demolding groove is not too deep under the condition that the mold can be demolded, thereby avoiding that the fourth sub-axle sleeve loses too much base body for opening the second demolding groove, and the structural strength of the fourth sub-axle sleeve is ensured.

[0030] In a possible design, the base is provided with a support block, the support block is located in the first interval groove and the second interval groove, the support block is provided with a first through hole and a second through hole, the first connecting shaft is slidingly connected in the first through hole, and the second connecting shaft is slidingly connected in the second through hole.

[0031] The support block can support the middle part of the first connecting shaft and the middle part of the second connecting shaft, thereby improving the stability of the first connecting shaft and the second connecting shaft, and further improving the rotation stability of the first swing arm and the second swing arm.

[0032] In a possible design, the support block is provided with a first stop surface and a second stop surface, the first interval slot is provided with a first matching surface, and the second interval slot is provided with a second matching surface. When the first swing arm and the second swing arm rotate to the unfolded state, the first matching surface abuts against the first stop surface, and the second matching surface abuts against the second stop surface.

[0033] The support block is provided with the first stop surface and the second stop surface, which can limit the unfolding angle of the first swing arm and the second swing arm, so as to prevent the first swing arm and the second swing arm from rotating excessively. In addition, the first matching surface is arranged in the first interval slot, which can make the overall structure of the first swing arm compact, and correspondingly, the second matching surface is arranged in the second interval slot, which can make the overall structure of the second swing arm, and is more conducive to reducing the size of the hinge assembly.

[0034] In a possible design, the first idler gear is provided with a first connecting rod extending from both ends in the axial direction of the first idler gear, and the second idler gear is provided with a second connecting rod extending from both ends in the axial direction of the second idler gear. The first support is provided with a third through hole and a fourth through hole, and the support block is provided with a fifth through hole and a sixth through hole. One end of the first connecting rod is slidably and rotatably connected to the third through hole, the other end of the first connecting rod is rotatably connected to the fifth through hole, one end of the second connecting rod is slidably and rotatably connected to the fourth through hole, and the other end of the second connecting rod is rotatably connected to the sixth through hole.

[0035] In a possible design, the first swing arm is provided with a first shaft sleeve rotatably connected with the first connecting shaft, and the first swing arm cam, the first gear and the third swing arm cam are located in the first shaft sleeve. The second swing arm is provided with a second shaft sleeve rotatably connected with the second connecting shaft, and the second swing arm cam, the second gear and the fourth swing arm cam are located in the second shaft sleeve.

[0036] The first shaft sleeve and the second shaft sleeve are not split, so that the first shaft sleeve and the second shaft sleeve have sufficient bases, thereby ensuring the structural strength of the first shaft sleeve and the second shaft sleeve, ensuring the reliability of the rotatable connection between the first swing arm and the first connecting shaft, and ensuring the reliability of the rotatable connection between the second swing arm and the second connecting shaft.

[0037] In a possible design, the tooth groove of the first gear does not penetrate through the side facing the third swing arm cam, and the tooth groove of the second gear does not penetrate through the side facing the fourth swing arm cam.

[0038] The convex part of the third swing arm cam and the convex part of the fourth swing arm cam can have sufficient structural strength.

[0039] In a possible design, the tooth top of the first gear is coplanar with the outer surface of the first shaft sleeve, and the tooth top of the second gear is coplanar with the outer surface of the second shaft sleeve.

[0040] The structural strength of the first shaft sleeve and the second shaft sleeve is improved, and the reliability of the rotational connection between the first swing arm and the first connecting shaft and the reliability of the rotational connection between the second swing arm and the second connecting shaft are ensured.

[0041] In a possible design, the first idler gear is provided with a first connecting rod protruding from both ends in the axial direction of the first idler gear, and the second idler gear is provided with a second connecting rod protruding from both ends in the axial direction of the second idler gear. The first support is provided with a third through hole and a fourth through hole, and the second support is provided with a seventh through hole and an eighth through hole. One end of the first connecting rod is slidably and rotatably connected to the third through hole, the other end of the first connecting rod is slidably and rotatably connected to the seventh through hole, one end of the second connecting rod is slidably and rotatably connected to the fourth through hole, and the other end of the second connecting rod is slidably and rotatably connected to the eighth through hole.

[0042] In a possible design, the second support is provided with a ninth through hole and a tenth through hole, the first connecting shaft is slidably connected to the ninth through hole, and the second connecting shaft is slidably connected to the tenth through hole.

[0043] In a second aspect, the present application also provides an electronic device including the hinge assembly.

[0044] The electronic device in the present application can meet the development needs of miniaturization and thinning of the foldable electronic device, and can increase the reliability and service life of the hinge assembly, while ensuring a better opening and closing feeling for the user when folding or unfolding the electronic device.

[0045] In a possible design, the hinge assembly is connected between the first housing and the second housing, and the screen is arranged on one side of the first housing, the hinge assembly, and the second housing. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0048] FIG. 3 is a schematic view of the 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 diagram of a gear in the related art;

[0051] FIG. 6 is a schematic diagram of a cylindrical cam in the related art;

[0052] FIG. 7 is a partial schematic diagram of an example of a hinge assembly provided by an embodiment of the present application;

[0053] FIG. 8 is an exploded view of the hinge assembly in FIG. 7;

[0054] FIG. 9 is a schematic diagram of the working principle of the hinge assembly in FIG. 7;

[0055] FIG. 10 is a partial schematic diagram of another example of a hinge assembly provided by an embodiment of the present application;

[0056] FIG. 11 is an enlarged view of the first swing arm in FIG. 8;

[0057] FIG. 12 is a schematic diagram of the first swing arm in FIG. 11 from another perspective;

[0058] FIG. 13 is an enlarged view of the first support in FIG. 8;

[0059] FIG. 14 is a schematic diagram of forming a first gear on a first sub-shaft sleeve using an injection molding process;

[0060] FIG. 15 is a schematic diagram of a first swing arm provided by an embodiment of the present application when injecting a first gear on a first sub-shaft sleeve;

[0061] FIG. 16 is a schematic diagram of the mold in FIG. 15 when demolding;

[0062] FIG. 17 is an enlarged view of the base in FIG. 8;

[0063] FIG. 18 is an enlarged view of the first idler gear and the second idler gear in FIG. 8;

[0064] FIG. 19 is an enlarged view of the second support in FIG. 8;

[0065] FIG. 20 is a partial schematic diagram of another example of a hinge assembly provided by an embodiment of the present application;

[0066] FIG. 21 is an exploded view of the hinge assembly in FIG. 20;

[0067] FIG. 22 is an enlarged view of the first swing arm in FIG. 21;

[0068] FIG. 23 is a schematic diagram of the first swing arm in FIG. 22 from another perspective;

[0069] FIG. 24 is a partial schematic diagram of another example of a hinge assembly provided by an embodiment of the present application;

[0070] FIG. 25 is an exploded view of the hinge assembly in FIG. 24;

[0071] Fig. 26 is an enlarged view of the first swing arm in Fig. 25;

[0072] Fig. 27 is a schematic view of another perspective of the first swing arm in Fig. 26;

[0073] Fig. 28 is an enlarged view of the synchronization assembly in Fig. 25;

[0074] Fig. 29 is an enlarged view of the second bracket in Fig. 25.

[0075] Reference signs: 001, tooth; 002, tooth groove; 003, tooth root; 004, tooth top; 005, cylindrical base; 006, protrusion; 007, groove; 01, swing arm; 02, idler; 03, synchronization gear; 04, damping cam; 05, driven cam; 06, base; 07, elastic member; 08, support block; 10, base; 11, first connecting shaft; 12, second connecting shaft; 13, support block; 131, first through hole; 132, second through hole; 133, fifth through hole; 134, sixth through hole; 14, first stop surface; 15, second stop surface; 16, support plate; 20, first swing arm; 21, first swing arm cam; 22, first gear; 24, third swing arm cam; 25, first separation groove; 26, first shaft sleeve; 261, first sub-shaft sleeve; 262, second sub-shaft sleeve; 263, first demolding groove; 28, first matching surface; 30, second swing arm; 31, second swing arm cam; 32, second gear; 34, fourth swing arm cam; 35, second separation groove; 36, second shaft sleeve; 361, third sub-shaft sleeve; 362, fourth sub-shaft sleeve; 363, second demolding groove; 40, synchronization assembly; 41, first idler; 411, first connecting rod; 42, second idler; 421, second connecting rod; 50, damping assembly; 51, first bracket; 511, first cam; 512, second cam; 513, third through hole; 514, fourth through hole; 52, second bracket; 521, third cam; 522, fourth cam; 523, seventh through hole; 524, eighth through hole; 525, ninth through hole; 526, tenth through hole; 53, third bracket; 54, elastic member; 60, mold; 100, hinge assembly; 200, first housing; 300, second housing; 400, screen. DETAILED DESCRIPTION

[0076] The related content that the embodiments of the present application can involve is exemplarily introduced below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0077] In the description of the application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication 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 application can be understood according to the specific circumstances.

[0078] In the description of the application, it should be understood that the terms "up", "down", "side", "in", "out", "top", "bottom" and the like indicate the orientation or positional relationship based on the installation, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the application.

[0079] It should be further pointed out that the same reference signs in the embodiments of the application represent the same component or the same part, and for the same parts in the embodiments of the application, only one part or component may be labeled with a reference sign in the drawing, and it should be understood that the reference sign is also applicable to other identical parts or components.

[0080] In the description of the application, it should be pointed out that the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone.

[0081] The flexible screen has the characteristics of being bendable, and has been applied to foldable electronic devices such as mobile phones, tablet computers, wristbands, game consoles and wearable devices. The display 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 only 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 characteristics make foldable electronic devices very popular with consumers.

[0082] FIG. 1 is an exploded schematic view of a screen 400 and a housing of a foldable mobile phone provided in an embodiment of the present application. FIG. 2 is a schematic view of the foldable mobile phone in a flat state provided in an embodiment of the present application. FIG. 3 is a schematic view of the foldable mobile phone in a folded state provided in an embodiment of the present application. In addition, for the convenience of the description of each of the embodiments 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 both the Y direction and the Z direction is defined as the X direction.

[0083] As shown in FIGS. 1-3, in an embodiment of the present application, the electronic device is taken as an example of a foldable mobile phone, which 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.

[0084] The first housing 200 and the second housing 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 housing 200 and the second housing 300 at the two ends, respectively. The first housing 200 can be a hard shell, and the second housing 300 can also be a hard shell, so that the first housing 200 and the second housing 300 can stably support the two ends of the screen 400.

[0085] The hinge assembly 100 can deform with the folding or unfolding of the second housing 300 relative to the first housing 200, and limit the second housing 300 from separating from the first housing 200. Specifically, the opposite sides of the hinge assembly 100 are connected to the first housing 200 and the second housing 300, respectively. The hinge assembly 100 utilizes its rotatable property, so that the first housing 200 can be flipped relative to the second housing 300, so that the first housing 200 is in a folded state relative to the second housing 300, or in an unfolded state, or in a state between the folded state and the unfolded state.

[0086] The first housing 200 and the second housing 300 can be folded or unfolded relative to each other, so that the foldable mobile phone provided in an embodiment of the present application has multiple modes, which can meet the use requirements of users in different scenarios. For example, as shown in FIG. 6, the first housing 200 and the second housing 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 it can be conveniently stored and carried by the user.

[0087] The first shell 200 and the second shell 300 are respectively provided with magnets at positions away from the hinge assembly 100, and the magnets on the two shells are attracted to each other when the first shell 200 and the second shell 300 are in the folded state, so as to prevent the first shell 200 and the second shell 300 from being accidentally opened, and ensure that the foldable mobile phone remains closed during storage and carrying.

[0088] The first shell 200 and the second shell 300 can be in a state between folding and flattening, for example, an included angle of 90-120 degrees is formed between the first shell 200 and the second shell 300, so that the foldable mobile phone is 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 the effect of a counterweight base, which can ensure that the foldable mobile phone is placed stably.

[0089] The first shell 200 and the second shell 300 can also be relatively flattened, for example, as shown in FIG. 5, an included angle of 180 degrees is formed between the first shell 200 and the second shell 300, which can realize large-screen display and provide users with more abundant information and better user experience.

[0090] It can be understood that when a user holds the foldable mobile phone, the position of the earpiece module of the foldable mobile phone can be defined as the upper edge of the foldable mobile phone, the position of the microphone module of the foldable mobile phone 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.

[0091] 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 up and down. 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 left and right, for example, as shown in FIG. 6.

[0092] The hinge assembly 100 is also used to support the screen 400 to prevent the screen 400 from collapsing. In an embodiment provided in the present application, the hinge assembly 100 is provided with a screen 400 support assembly that can rise to support the screen 400 as the hinge assembly 100 is flattened, and can lower to leave a containing space for the screen 400 as the hinge assembly 100 is folded.

[0093] The screen 400 can be a flexible screen that can be folded as a whole, or the screen 400 can also be a combination of a flexible screen in the middle area and rigid screens at both ends, which is not limited in the present application.

[0094] The foldable mobile phone can further include a plurality of modules, and the plurality of modules can be accommodated inside the first housing 200 and the second housing 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, a receiver 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 particular.

[0095] In the foldable mobile phone provided in the embodiments of the present application, the foldable mobile phone is taken as an example of a two-fold structure, that is, the foldable mobile phone includes two housing parts (the first housing 200 and the second housing 300) and a hinge assembly 100 connected between the two housing parts; the two housing parts can be rotated towards each other to be stacked on each other in a manner that the screens 400 are attached to each other, so that the foldable mobile phone assumes a two-layer form, that is, the case shown in FIG. 6, at this time, the foldable mobile phone is an inward folding foldable mobile phone; the two housing parts can also be rotated away from each other to be stacked on each other, so that the foldable mobile phone assumes a two-layer form, that is, at this time, the foldable mobile phone is an outward folding foldable mobile phone.

[0096] In another embodiment of the present application, the foldable mobile phone can also have a three-fold or more structure, that is, the foldable mobile phone includes three or more housing parts, and adjacent two housing parts are connected by a hinge assembly 100, and the adjacent two housing parts can be rotated towards each other to be stacked on each other or rotated away from each other to be flattened. When the foldable mobile phone has 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, and the present application will not be described again.

[0097] In some other embodiments of the present application, the electronic device includes, but is not limited to, a foldable tablet computer, a foldable game console, a foldable electronic reader, a foldable wearable device, etc., and can also be other foldable electronic devices with foldable function and the need to realize miniaturization and lightweight design.

[0098] As introduced above, the foldable mobile phone has a hinge assembly. 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 needs to add a damping mechanism. In addition, in order to enable the two side housings of the foldable electronic device to rotate synchronously, the hinge assembly also needs to add a synchronous mechanism.

[0099] In the current hinge assembly, the damping mechanism and the synchronous mechanism are usually two relatively independent parts, and there is no reusable part between the damping mechanism and the synchronous mechanism, which leads to a larger space occupied by the synchronous mechanism and the damping mechanism in the hinge assembly, so that the hinge assembly cannot meet the development needs of miniaturization and lightweight design of the foldable electronic device. The defects of the hinge assembly in the related art will be described in detail below with reference to the drawings.

[0100] Figure 4 is a partial schematic view of a hinge assembly in the related art. As shown in Figure 4, the hinge assembly on a foldable mobile phone in the related art mainly consists of a base 06, a swing arm 01, a damping mechanism, and a synchronization mechanism, etc. The synchronization mechanism mainly consists of two synchronization gears 03 and two idlers 02. The two synchronization gears 03 mesh with the two idlers 02. The swing arms 01 on both sides of the base 06 are respectively connected in transmission with the two synchronization gears 03 through shafts. When any one of the swing arms 01 on both sides rotates relative to the base 06, the swing arm 01 drives the corresponding synchronization gear 03 to rotate. The synchronization gear 03 transmits torque through the two idlers 02 to drive the other synchronization gear 03 to rotate, thereby synchronously rotating the other swing arm 01, and thus realizing the synchronous rotation of the swing arms 01 on both sides. The damping mechanism mainly consists of two damping cams 04, a cam bracket, and an elastic member 07. The cam bracket compresses the elastic member 07 on the base 06 or other brackets. The cam bracket is provided with two driven cams 05, which are respectively engaged with the two damping cams 04. The swing arms 01 on both sides of the base 06 are respectively fixedly connected with the two damping cams 04. When the swing arms 01 on both sides rotate relative to the base 06, the swing arm 01 drives the corresponding damping cam 04 to rotate. The protruding part of the damping cam 04 extrudes the protruding part of the driven cam 05. The cam bracket extrudes the elastic member 07. When the protruding part of the damping cam 04 slides through the protruding part of the driven cam 05 and enters the next groove, the cam bracket re-engages the driven cam 05 and the damping cam 04 under the elastic force of the elastic member 07. In this way, the continuous rotation of the swing arm 01 can make the damping cam 04 and the driven cam 05 continuously separate and engage, thereby realizing the damping and hovering effect of the swing arm 01.

[0101] It can be seen that in the hinge assembly in the related art, the synchronization gears 03 and the idlers 02 constituting the synchronization mechanism, and the damping cams 04, the cam bracket, and the elastic member 07 constituting the damping mechanism, do not have any mutually reusable parts. The damping mechanism and the synchronization mechanism can only be designed as two independent parts, which results in a large space occupied by the synchronization mechanism and the damping mechanism in the hinge assembly, and makes the hinge assembly unable to meet the development demand of miniaturization and thinness of foldable electronic devices. In addition, as shown in Figure 4, the swing arms 01 on both sides of the base 06 are respectively connected in transmission with the two synchronization gears 03 through shafts. In order to ensure that the synchronization gears 03 can stably rotate, support blocks 08 need to be installed near the synchronization gears 03 to stably support the shafts. The presence of the support blocks 08 further separates the synchronization gears 03 and the damping cams 04 by a distance, thereby further increasing the space occupied by the damping mechanism and the synchronization mechanism in the hinge assembly.

[0102] Therefore, in order to solve the above technical problems, the present application provides a hinge assembly and an electronic device, which integrates some parts used for performing synchronization and damping functions into one, so as to reduce the size of the hinge assembly and make the hinge assembly meet the needs of miniaturization and thinning of the electronic device.

[0103] 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. For the convenience of understanding, the technical terms (such as the tooth groove, the tooth top, the protruding part, etc. mentioned below) involved in the embodiments of the present application are first explained and described.

[0104] FIG. 5 is a schematic diagram of a gear in the related art. As shown in FIG. 5, the gear refers to a mechanical component with teeth 001 on the rim, which can continuously mesh to transmit motion and power. The gear is mainly composed of a plurality of teeth 001 distributed in the circumferential direction, and the gap between the two adjacent teeth 001 is a tooth groove 002, and the bottom of the tooth groove 002 is a tooth root 003, and the top of the tooth 001 is a tooth top 004.

[0105] FIG. 6 is a schematic diagram of a cylindrical cam in the related art. As shown in FIG. 6, the cylindrical cam is a mechanical component, which is often used to convert rotary motion into linear or other forms of motion. The cylindrical cam is usually composed of a cylindrical base body 005 and one or more protruding parts 006. The cylindrical base body 005 can be fixed in the mechanical system through bearings or other support means, and the protruding part 006 is usually located at the end of the cylindrical base body 005. The gap between the two adjacent protruding parts 006 is a groove 007.

[0106] FIG. 7 is a partial schematic diagram of an example of the hinge assembly 100 provided by the embodiments of the present application. FIG. 8 is an exploded view of the hinge assembly 100 in FIG. 7.

[0107] As shown in FIGS. 7-8, the embodiments of the present application provide a hinge assembly 100, which includes a base 10, a first swing arm 20, a second swing arm 30, a synchronization assembly 40, a damping assembly 50, etc.

[0108] The base 10 is provided with a support block 13, a first connecting shaft 11 and a second connecting shaft 12. The support block 13 is provided with a first through hole 131 and a second through hole 132. The first connecting shaft 11 is arranged in the first through hole 131, and the second connecting shaft 12 is arranged in the second through hole 132. The first connecting shaft 11 and the second connecting shaft 12 can slide relative to the base 10. In addition, the two ends of the first connecting shaft 11 and the second connecting shaft 12 can also be slidably connected with other components fixed on the base 10, so as to ensure the stability of the first connecting shaft 11 and the second connecting shaft 12.

[0109] The first swing arm 20 is rotationally connected to the first connecting shaft 11. The first swing arm 20 can be provided with a rotation hole for rotationally cooperating with the first connecting shaft 11, and the first swing arm 20 is rotationally connected to the first connecting shaft 11 through the rotation hole. Alternatively, the first swing arm 20 is provided with a first shaft sleeve 26 rotationally sleeved on the outer periphery of the first connecting shaft 11, and the first swing arm 20 is rotationally connected to the first connecting shaft 11 through the first shaft sleeve 26. The first swing arm 20 is provided with a first swing arm cam 21, and the protruding part of the first swing arm cam 21 protrudes along the axial direction of the first connecting shaft 11. The first swing arm 20 is also provided with a first gear 22, and the gear teeth of the first gear 22 protrude along the radial direction of the first connecting shaft 11.

[0110] The second swing arm 30 is rotationally connected to the second connecting shaft 12. The second swing arm 30 can be provided with a rotation hole for rotationally cooperating with the second connecting shaft 12, and the second swing arm 30 is rotationally connected to the second connecting shaft 12 through the rotation hole. Alternatively, the second swing arm 30 is provided with a second shaft sleeve 36 rotationally sleeved on the outer periphery of the second connecting shaft 12, and the second swing arm 30 is rotationally connected to the second connecting shaft 12 through the second shaft sleeve 36. The second swing arm 30 is provided with a second swing arm cam 31, and the protruding part of the second swing arm cam 31 protrudes along the axial direction of the second connecting shaft 12. The second swing arm 30 is also provided with a second gear 32, and the gear teeth of the second gear 32 protrude along the radial direction of the second connecting shaft 12.

[0111] Further, as shown in FIGS. 7-8, the synchronous assembly 40 includes a first idler gear 41 and a second idler gear 42, which are rotationally connected to the base 10. The specific structure can be designed as follows: a through hole is formed in the support block 13, and a first support 51 (detailed later) is also provided with a through hole. The first idler gear 41 is provided with a first connecting rod 411 protruding from both ends along the axial direction of the first idler gear 41. One end of the first connecting rod 411 is rotationally connected to the through hole in the support block 13, and the other end of the first connecting rod 411 is slidingly and rotationally connected to the through hole in the first support 51, thereby realizing the rotational connection between the first idler gear 41 and the base 10. The second idler gear 42 is provided with a second connecting rod 421 protruding from both ends along the axial direction of the second idler gear 42. One end of the second connecting rod 421 is rotationally connected to the through hole in the support block 13, and the other end of the second connecting rod 421 is slidingly and rotationally connected to the through hole in the first support 51, thereby realizing the rotational connection between the first idler gear 41 and the base 10.

[0112] The first gear 22, the first idler gear 41, the second idler gear 42, and the second gear 32 are sequentially meshed. If the first swing arm 20 rotates, the first swing arm 20 drives the first gear 22 to rotate. The first gear 22 transmits the torque to the second gear 32 through the first idler gear 41 and the second idler gear 42, thereby driving the second gear 32 to rotate and synchronously rotating the second swing arm 30.

[0113] Further as shown in FIG. 7-8, the damping assembly 50 comprises the elastic member 54 and the first support 51, which can be fixedly connected with the first connecting shaft 11 and the second connecting shaft 12, and the first support 51 is provided with the first cam 511 which is engaged with the first swing arm cam 21, and the first support 51 is further provided with the second cam 512 which is engaged with the second swing arm cam 31, and the first swing arm cam 21, the second swing arm cam 31, the first cam 511 and the second cam 512 all adopt the structure similar to the cylindrical cam mentioned above. When the first swing arm 20 and the second swing arm 30 rotate synchronously, the first swing arm 20 drives the first swing arm cam 21 to rotate, the protruding part of the first swing arm cam 21 extrudes the protruding part of the first cam 511, the second swing arm 30 drives the second swing arm cam 31 to rotate, the protruding part of the second swing arm cam 31 extrudes the protruding part of the second cam 512, and under the condition that the first cam 511 and the second cam 512 are extruded simultaneously, the first support 51 slides relative to the base 10, at this time the first support 51 can extrude the elastic member 54 through direct or indirect mode; when the protruding part of the first swing arm cam 21 slides through the protruding part of the first cam 511 and enters the next recess of the first cam 511, and the protruding part of the second swing arm cam 31 slides through the protruding part of the second cam 512 and enters the next recess of the second cam 512, the first support 51 is driven by the elastic force of the elastic member 54 to re-engage the first swing arm cam 21 and the first cam 511, and re-engage the second swing arm cam 31 and the second cam 512, and so on, and the continuous rotation of the first swing arm 20 and the second swing arm 30 can make the first swing arm cam 21 and the first cam 511 continuously separate and engage, and the second swing arm cam 31 and the second cam 512 continuously separate and engage, thereby realizing the damping and hovering effect of the first swing arm 20 and the second swing arm 30.

[0114] The first gear 22 participating in the hinge synchronization function and the first swing arm cam 21 participating in the hinge damping function are both arranged on the first swing arm 20 in the hinge assembly 100 provided by the embodiments of the present application, so that the first gear 22 and the first swing arm cam 21 can be integrated into an integral structure; the second gear 32 participating in the hinge synchronization function and the second swing arm cam 31 participating in the hinge damping function are both arranged on the second swing arm 30, so that the second gear 32 and the second swing arm cam 31 can be integrated into an integral structure. Compared with the split design mode of the synchronization gear 03 and the damping cam 04 in the related art, there is no installation distance or separation gap between the first gear 22 and the first swing arm cam 21, and between the second gear 32 and the second swing arm cam 31 in the embodiments of the present application, so that the occupied space of the synchronization assembly 40 and the damping assembly 50 in the hinge assembly 100 can be reduced, and the hinge assembly 100 can meet the development needs of miniaturization and light and thin of the foldable mobile phone.

[0115] Next, the structure of the first swing arm 20 is described in detail. FIG. 11 is an enlarged view of the first swing arm 20 in FIG. 8; FIG. 12 is a schematic view of the first swing arm 20 in FIG. 11 from another perspective. FIG. 13 is an enlarged view of the first support 51 in FIG. 8. It should be noted that the specific structure of the second swing arm 30 in the embodiments of the present application is the same as that of the first swing arm 20, and therefore the enlarged view of the second swing arm 30 is omitted, and the specific structure of the second swing arm 30 can be understood with reference to the first swing arm 20 in FIGS. 11 and 12.

[0116] As shown in FIGS. 11-13, in the hinge assembly 100 provided in the embodiments of the present application, the tooth groove of the first gear 22 on the first swing arm 20 does not penetrate through the side facing the first swing arm cam 21, so that the convex portion of the first swing arm cam 21 has a complete surface type, or in other words, the convex portion of the first swing arm cam 21 has a complete base body, which can ensure that the convex portion of the first swing arm cam 21 has sufficient structural strength, so that the convex portion of the first swing arm cam 21 is not easily deformed or worn by the convex portion of the first cam 511 when the first swing arm cam 21 is pressed against the first cam 511, thereby increasing the reliability of the first swing arm cam 21; in addition, since the convex portion of the first swing arm cam 21 has a complete surface type, the sliding contact area between the convex portion of the first swing arm cam 21 and the convex portion of the first cam 511 is basically stable during the entire sliding process, and the two can relatively smoothly slide, avoiding the situation that the first swing arm cam 21 is stuck and shakes, thereby ensuring the stability of the first swing arm 20 during the folding or unfolding process. Correspondingly, the second swing arm 30 has similar working principles and technical effects as the first swing arm 20.

[0117] Overall, through the above design, the size of the hinge assembly 100 in the embodiments of the present application can be reduced, and the reliability and service life of the hinge assembly 100 can be increased, and when the hinge assembly 100 in the embodiments of the present application is applied to a foldable mobile phone, the user can have a better opening and closing feeling when folding or unfolding the mobile phone.

[0118] It is mentioned above that the first support 51 can directly or indirectly press the elastic member 54 during the unfolding and folding of the foldable device, and the two implementation modes are described below with reference to the accompanying drawings.

[0119] First, the implementation mode in which the first support 51 indirectly presses the elastic member 54 is described.

[0120] Referring back to Fig. 8, in an embodiment provided by the present application, the damping assembly 50 further comprises a second bracket 52 and a third bracket 53, and the elastic member 54 is compressed between the second bracket 52 and the third bracket 53. One end of the first connecting shaft 11 and the second connecting shaft 12 is fixedly connected with the third bracket 53, and the other end of the first connecting shaft 11 and the second connecting shaft 12 is fixedly connected with the first bracket 51. Under the drive of the first swing arm cam 21 and the second swing arm cam 31, the first bracket 51 drives the first connecting shaft 11 and the second connecting shaft 12 to slide relative to the base 10, i.e. the first connecting shaft 11 slides in the first through hole 131, and the second connecting shaft 12 slides in the second through hole 132, and the first connecting shaft 11 and the second connecting shaft 12 in turn drive the third bracket 53 to press the elastic member 54.

[0121] Fig. 9 further introduces the working principle of the hinge assembly 100 in Figs. 7 and 8. As shown in Fig. 9, as the first swing arm 20 and the second swing arm 30 rotate relative to the base 10, the first swing arm cam 21 and the second swing arm cam 31 together press the first bracket 51. The first bracket 51 is moved in the direction a indicated by the dotted arrow under the action of force, and drives the first connecting shaft 11 and the second connecting shaft 12 to move together. The third bracket 53 is fixed to the other end of the first connecting shaft 11 and the second connecting shaft 12, and the movement of the first connecting shaft 11 and the second connecting shaft 12 in turn drives the third bracket 53 to move in the direction a, thereby realizing the pressing of the elastic member 54 by the third bracket 53, i.e. the first bracket 51 realizes the pressing of the elastic member 54 through the movement of the third bracket 53 in the direction a, i.e. the first bracket 51 indirectly presses the elastic member 54.

[0122] Next, an embodiment in which the first bracket 51 directly presses the elastic member 54 is introduced.

[0123] Fig. 10 is a partial schematic view of another example of the hinge assembly 100 provided by an embodiment of the present application. As shown in Fig. 10, in an embodiment provided by the present application, the elastic member 54 is compressed between the first bracket 51 and the support plate 16. The support plate 16 can be a plate-shaped structure extending upward from the base 10, or an additionally added plate-shaped structure.

[0124] The working process of the damping assembly 50 in the present embodiment is as follows: as the first swing arm 20 and the second swing arm 30 rotate relative to the base 10, the first swing arm cam 21 and the second swing arm cam 31 together press the first bracket 51. The first bracket 51 is moved in the direction a indicated by the dotted arrow under the action of force, so that the first bracket 51 directly presses the elastic member 54, i.e. the first bracket 51 directly presses the elastic member 54.

[0125] In addition to the two implementation manners described above, in another embodiment provided in the present application, the elastic member 54 can also be extruded by the second support 52, specifically referring back to Fig. 8, the first swing arm 20 is provided with a third swing arm cam 24 on the side opposite to the first swing arm cam 21, the protruding part of the third swing arm cam 24 protrudes along the axial direction of the first connecting shaft 11, the second swing arm 30 is provided with a fourth swing arm cam 34 on the side opposite to the second swing arm cam 31, the protruding part of the fourth swing arm cam 34 protrudes along the axial direction of the second connecting shaft 12. The damping assembly 50 further comprises a second support 52, the second support 52 is provided with a third cam 521, the third cam 521 is engaged with the third swing arm cam 24, the second support 52 is further provided with a fourth cam 522, the fourth cam 522 is engaged with the fourth swing arm cam 34, under the drive of the third swing arm cam 24 and the fourth swing arm cam 34, the second support 52 can extrude the elastic member 54.

[0126] The working process of the damping assembly 50 in the embodiment is as follows: as shown in Fig. 9, with the rotation of the first swing arm 20 and the second swing arm 30 relative to the base 10, the third swing arm cam 24 and the fourth swing arm cam 34 extrude the second support 52 together. The second support 52 moves in the direction b indicated by the dashed arrow under the action of force, that is, the second support 52 extrudes the elastic member 54.

[0127] In the embodiment, by adding the third swing arm cam 24 on the first swing arm 20 and the fourth swing arm cam 34 on the second swing arm 30, and extruding the elastic member 54 by the third swing arm cam 24 and the fourth swing arm cam 34 through the second support 52, the hinge assembly 100 increases a set of damping mechanism on the basis of the original, which can increase the damping force of the hinge assembly 100, improve the user's opening and closing feeling, and improve the anti-shock performance of the foldable mobile phone when hovering, so that the first shell 200 and the second shell 300 are not easily closed by external vibration when in the state between folding and unfolding.

[0128] In addition, by adding the third swing arm cam 24 on the original first swing arm 20 and the fourth swing arm cam 34 on the original second swing arm 30, and extruding the elastic member 54 by the first support 51 through an indirect way, the elastic member 54 is reused in the embodiment, and no special parts are added to excessively increase the space occupied by the hinge assembly 100, so the volume of the hinge assembly 100 is less affected.

[0129] As mentioned above, the first swing arm 20 is rotationally connected to the first connecting shaft 11, and the second swing arm 30 is rotationally connected to the second connecting shaft 12, which has two implementation manners, the first one is that the swing arm is provided with a rotation hole matched with the connecting shaft for rotation, and the second one is that the swing arm is provided with a shaft sleeve rotationally sleeved on the outer periphery of the connecting shaft, which will be described in detail below.

[0130] As shown in FIGS. 11-12, in an embodiment provided by the present application, the first swing arm 20 is provided with a first shaft sleeve 26 rotatably connected with the first connecting shaft 11, the first shaft sleeve 26 comprises a first sub-shaft sleeve 261 and a second sub-shaft sleeve 262, and the first sub-shaft sleeve 261 and the second sub-shaft sleeve 262 have a first interval slot 25 therebetween, the first swing arm cam 21 and the first gear 22 are located in the first sub-shaft sleeve 261, and the third swing arm cam 24 is located in the second sub-shaft sleeve 262. The second swing arm 30 is provided with a second shaft sleeve 36 rotatably connected with the second connecting shaft 12, the second shaft sleeve 36 comprises a third sub-shaft sleeve 361 and a fourth sub-shaft sleeve 362, and the third sub-shaft sleeve 361 and the fourth sub-shaft sleeve 362 have a second interval slot 35 therebetween, the second swing arm cam 31 and the second gear 32 are located in the third sub-shaft sleeve 361, and the fourth swing arm cam 34 is located in the fourth sub-shaft sleeve 362.

[0131] The first swing arm cam 21 and the first gear 22 on the first sub-shaft sleeve 261 can be formed in various ways, for example, can be integrally formed by 3D printing technology, or can be processed by laser etching process, or can be processed by using a Computer numerical control (CNC) system in a manner of grinding, cutting, drilling, turning, milling, etc., or can be processed by injection molding process.

[0132] Correspondingly, the third swing arm cam 24 on the second sub-shaft sleeve 262, the second swing arm cam 31 and the second gear 32 on the third sub-shaft sleeve 361, and the fourth swing arm cam 34 on the fourth sub-shaft sleeve 362 can also be processed by the above-mentioned process methods.

[0133] The first sub-shaft sleeve 261 and the second sub-shaft sleeve 262 can be fixedly connected with the first swing arm 20 by fasteners, welding, adhesion, etc.; or the first sub-shaft sleeve 261 and the second sub-shaft sleeve 262 can be directly provided on the first swing arm 20 by integrally forming, for example, by using the above-mentioned 3D printing technology, injection molding process, etc.

[0134] In the embodiment, the swing arm is rotatably connected to the connecting shaft through the shaft sleeve. Since the shaft sleeve has the compact structure, the rotatable connection between the swing arm and the connecting shaft occupies a smaller space. Moreover, the two cams on the swing arm are arranged on the two sub-sleeves, which can reduce the material loss during manufacturing of the swing arm and improve the yield of the swing arm. The specific reasons are as follows: taking the first swing arm 20 as an example, if the first swing arm cam 21, the first gear 22, and the third swing arm cam 24 are formed on the first sleeve 26, the machining precision needs to be strictly controlled. If any of the first swing arm cam 21, the first gear 22, and the third swing arm cam 24 has a problem due to machining error, the first sleeve 26 will be scrapped as a whole. The first sleeve 26 is split into the first sub-sleeve 261 and the second sub-sleeve 262. The first swing arm cam 21 and the first gear 22 are machined on the first sub-sleeve 261, and the third swing arm cam 24 is machined on the second sub-sleeve 262. When any of the first swing arm cam 21, the first gear 22, and the third swing arm cam 24 has a machining problem, only the sub-sleeve with the problem needs to be replaced, without causing the other sub-sleeve to be scrapped. Therefore, the material loss during manufacturing of the swing arm is reduced. Moreover, the first swing arm cam 21, the first gear 22, and the third swing arm cam 24 are machined on the first sub-sleeve 261 and the second sub-sleeve 262 respectively, which can reduce the machining difficulty of the first swing arm 20 and improve the yield of the first swing arm 20.

[0135] For example, as shown in FIGS. 11-12, in an embodiment provided by the present application, the tooth top of the first gear 22 is coplanar with the outer surface of the first sub-sleeve 261, and the tooth top of the second gear 32 is coplanar with the outer surface of the third sub-sleeve 361.

[0136] In the embodiment, the tooth top of the first gear 22 is prevented from sinking below the outer surface of the first sub-sleeve 261, which can reduce the loss of too much base body of the first sub-sleeve 261 for forming the first gear 22, thereby ensuring that the first sub-sleeve 261 has enough base body to ensure its structural strength. Correspondingly, the tooth top of the second gear 32 is prevented from sinking below the outer surface of the third sub-sleeve 361, which can reduce the loss of too much base body of the third sub-sleeve 361 for forming the second gear 32, thereby ensuring that the third sub-sleeve 361 has enough base body to ensure its structural strength. Overall, the structural strength of the first sub-sleeve 261 and the third sub-sleeve 361 is improved, which ensures the reliability of the rotatable connection between the first swing arm 20 and the first connecting shaft 11 and the reliability of the rotatable connection between the second swing arm 30 and the second connecting shaft 12.

[0137] As shown in FIGS. 11-12, in an embodiment provided by the present application, the tooth groove of the first gear 22 is through to one side of the first interval slot 25, the second sub-axle sleeve 262 has a first demolding groove 263, the first demolding groove 263 is through to one side of the first interval slot 25; the tooth groove of the second gear 32 is through to one side of the second interval slot 35, the fourth sub-axle sleeve 362 has a second demolding groove 363, the second demolding groove 363 is through to one side of the second interval slot 35.

[0138] In the embodiment, by designing the first demolding groove 263 on the second sub-axle sleeve 262, the difficulty and cost of forming the first gear 22 on the first sub-axle sleeve 261 can be reduced. Correspondingly, by designing the second demolding groove 363 on the fourth sub-axle sleeve 362, the difficulty and cost of forming the second gear 32 on the third sub-axle sleeve 361 can be reduced.

[0139] How to conveniently understand the above advantages will be introduced in detail below in combination with the principle schematic diagram.

[0140] First of all, it needs to be understood that, compared with 3D printing technology, laser etching process, numerical control machine tool technology, etc., the injection molding process has the advantages of low difficulty, high forming efficiency, scalable mass production, and low processing cost for forming the first gear 22 on the first sub-axle sleeve 261. However, the structure of the part is required to be high for injection molding, and not any structure of the part can be injection molded. Taking the injection molding of the first gear 22 on the first sub-axle sleeve 261 as an example, FIG. 14 is a schematic diagram of forming the first gear 22 on the first sub-axle sleeve 261 by using the injection molding process. As shown in FIG. 14, after the mold 60 is fixed outside the first sub-axle sleeve 261, the molten base material (such as resin material) is injected into the inside of the mold 60, and after the base material is cooled, the first gear 22 is formed outside the first sub-axle sleeve 261. At this time, if the demolding is performed along the radial direction (c direction in FIG. 14) of the first gear 22, it cannot be realized, because the tooth at G in FIG. 14 will interfere and block the mold 60. If the second sub-axle sleeve 262 does not have the first demolding groove 263, the demolding along the axial direction of the first gear 22 cannot be realized, so in this scenario, it is difficult to implement the injection molding technology on the first sub-axle sleeve 261.

[0141] Figure 15 is a schematic diagram of the first swing arm 20 being molded into the first gear 22 on the first sub-shaft sleeve 261 according to an embodiment of this application. Figure 16 is a schematic diagram of the mold 60 in Figure 15 being demolded. As shown in Figure 15, after the mold 60 is fixed to the outside of the first sub-shaft sleeve 261, molten substrate (e.g., resin material) is injected into the mold 60. After the substrate cools, the first gear 22 is formed on the outside of the first sub-shaft sleeve 261. Since the second sub-shaft sleeve 262 is designed with a first demolding groove 263, the mold 60 can be moved in the axial direction of the first gear 22 (d direction in Figure 15). In this way, the gear teeth will not interfere with or obstruct the mold 60. As shown in Figure 16, when the mold 60 is completely in the first demolding groove 263, the first demolding groove 263 can be moved out in the e direction in Figure 16.

[0142] In summary, by designing a first demolding groove 263 on the second sub-sleeve 262, a low-difficulty, high-efficiency, and low-cost injection molding process can be used to form the first gear 22 on the first sub-sleeve 261, thereby reducing the molding difficulty and processing cost of the first gear 22. Correspondingly, by designing a second demolding groove 363 on the fourth sub-sleeve 362, a low-difficulty, high-efficiency, and low-cost injection molding process can be used to form the second gear 32 on the third sub-sleeve 361, thereby reducing the molding difficulty and processing cost of the second gear 32.

[0143] As shown in Figures 11-12, in one embodiment provided in this application, the first demolding groove 263 is not through the side facing the third rocker arm cam 24, and the second demolding groove 363 is not through the side facing the fourth rocker arm cam 34.

[0144] In this embodiment, the first demolding groove 263 is not continuous on the side facing the third rocker arm cam 24. This ensures that the protruding part of the third rocker arm cam 24 has a complete surface shape, or in other words, that the protruding part of the third rocker arm cam 24 has a complete base. This ensures that the protruding part of the third rocker arm cam 24 has sufficient structural strength, and is not easily deformed or worn by the protruding part of the third cam 521, thereby increasing the reliability of the third rocker arm cam 24. In addition, when the protruding part of the third rocker arm cam 24 slides on the protruding part of the third cam 521, it can slide relatively smoothly, avoiding jamming and shaking, thus ensuring the stability of the first rocker arm 20 during folding or unfolding. Correspondingly, the second demolding groove 363 is not continuous on the side facing the fourth rocker arm cam 34, which also ensures that the protruding part of the fourth rocker arm cam 34 has sufficient structural strength and avoids jamming and shaking, thus ensuring the stability of the second rocker arm 30 during folding or unfolding.

[0145] Overall, the above design can further increase the reliability and service life of the hinge assembly 100. When the hinge assembly 100 in the embodiment of the present application is applied to a foldable mobile phone, it can ensure a better opening and closing feeling when the user folds or unfolds the mobile phone.

[0146] As shown in FIGS. 15-16, in an embodiment provided by the present application, the bottom of the first demolding groove 263 is coplanar with the dedendum of the first gear 22, and the bottom of the second demolding groove 363 is coplanar with the dedendum of the second gear 32.

[0147] In the embodiment, the bottom of the first demolding groove 263 is coplanar with the dedendum of the first gear 22, so that the first demolding groove 263 is not too deep under the condition that the mold 60 can be demolded, thereby avoiding that too much base body is lost for opening the first demolding groove 263, and further ensuring the structural strength of the second sub-shaft sleeve 262. Correspondingly, the bottom of the second demolding groove 363 is coplanar with the dedendum of the second gear 32, so that the second demolding groove 363 is not too deep under the condition that the mold 60 can be demolded, thereby avoiding that too much base body is lost for opening the second demolding groove 363, and further ensuring the structural strength of the fourth sub-shaft sleeve 362. Overall, the structural strength of the first swing arm 20 and the second swing arm 30 is further improved, and the reliability of the rotational connection between the first swing arm 20 and the first connecting shaft 11 and the reliability of the rotational connection between the second swing arm 30 and the second connecting shaft 12 are ensured.

[0148] The structures of other components in the embodiment of the present application will be described in detail below.

[0149] FIG. 17 is an enlarged view of the base 10 in FIG. 8.

[0150] Since the spans of the first connecting shaft 11 and the second connecting shaft 12 are large, the stability of the middle parts of the first connecting shaft 11 and the second connecting shaft 12 is poor. In order to solve this problem, as shown in FIG. 17, in an embodiment provided by the present application, the base 10 is provided with a support block 13, the support block 13 is located in the first spacing groove 25 and the second spacing groove 35, the support block 13 is provided with a first through hole 131 and a second through hole 132, the first connecting shaft 11 is slidingly connected in the first through hole 131, and the second connecting shaft 12 is slidingly connected in the second through hole 132.

[0151] In the embodiment, the middle parts of the first connecting shaft 11 and the second connecting shaft 12 can be supported by the support block 13, thereby improving the stability of the first connecting shaft 11 and the second connecting shaft 12, and further improving the rotational stability of the first swing arm 20 and the second swing arm 30.

[0152] As shown in FIG. 17, with reference to FIGS. 11 and 12, in an embodiment provided by the present application, the support block 13 is provided with the first stop surface 14 and the second stop surface 15, the first matching surface 28 is arranged in the first spacing groove 25, and the second matching surface is arranged in the second spacing groove 35. When the first swing arm 20 and the second swing arm 30 are turned to the unfolded state, the first matching surface 28 and the first stop surface 14 abut, and the second matching surface and the second stop surface 15 abut.

[0153] In the embodiment, the support block 13 is provided with the first stop surface 14 and the second stop surface 15, so as to limit the unfolding angle of the first swing arm 20 and the second swing arm 30, and prevent the first swing arm 20 and the second swing arm 30 from over-rotation. In addition, the first matching surface 28 is arranged in the first spacing groove 25, so that the first matching surface 28 is located inside the first swing arm 20, avoiding the first swing arm 20 from being affected in volume by arranging the first matching surface 28 at other positions of the first swing arm 20, so that the overall structure of the first swing arm 20 is compact, and correspondingly, the second swing arm 30 also has the advantage of compact overall structure, which is overall more conducive to reducing the volume of the hinge assembly 100.

[0154] FIG. 18 is an enlarged view of the first idler 41 and the second idler 42 in FIG. 8.

[0155] As shown in FIG. 18, with reference to FIGS. 13 and 17, in an embodiment provided by the present application, the first idler 41 is provided with the first connecting rod 411 protruding from both ends in the axial direction of the first idler 41, and the second idler 42 is provided with the second connecting rod 421 protruding from both ends in the axial direction of the second idler 42. The first support 51 is provided with the third through hole 513 and the fourth through hole 514, the support block 13 is provided with the fifth through hole 133 and the sixth through hole 134, one end of the first connecting rod 411 is slidingly and rotatably connected in the third through hole 513, the other end of the first connecting rod 411 is rotatably connected in the fifth through hole 133, one end of the second connecting rod 421 is slidingly and rotatably connected in the fourth through hole 514, and the other end of the second connecting rod 421 is rotatably connected in the sixth through hole 134.

[0156] In the embodiment, the rotating connection design of the first idler 41 with the first support 51 and the support block 13 is specifically given, and the rotating connection design of the second idler 42 with the first support 51 and the support block 13 is also specifically given. Since the first support 51 will also be pressed and moved by the first swing arm cam 21 and the second swing arm cam 31, the first idler 41 and the first support 51 also need to be designed to relatively slide, and the second idler 42 and the first support 51 also need to be designed to relatively slide.

[0157] FIG. 19 is an enlarged view of the second support 52 in FIG. 8.

[0158] As shown in FIG. 19, in an embodiment provided by the present application, the second support 52 is provided with a ninth through hole 525 and a tenth through hole 526, the first connecting shaft 11 is slidingly connected in the ninth through hole 525, and the second connecting shaft 12 is slidingly connected in the tenth through hole 526.

[0159] In the embodiment, the sliding connection design of the second support 52 with the first connecting shaft 11 and the second connecting shaft 12 is specifically given.

[0160] FIG. 20 is a partial schematic view of another example of the hinge assembly 100 provided by an embodiment of the present application. FIG. 21 is an exploded view of the hinge assembly 100 in FIG. 20.

[0161] The difference between the hinge assembly 100 in the embodiment and the hinge assembly 100 in the above-mentioned embodiments is the structure of the first swing arm 20 and the second swing arm 30.

[0162] FIG. 22 is an enlarged view of the first swing arm 20 in FIG. 21. FIG. 23 is a schematic view of the first swing arm 20 in FIG. 22 from another perspective. As shown in FIGS. 20-23, in the embodiment, the first swing arm 20 and the second swing arm 30 are different from those in the above-mentioned embodiments in that the second sub-shaft sleeve 262 does not have the first demolding groove 263, and the fourth sub-shaft sleeve 362 does not have the second demolding groove 363. When the first gear 22 is formed on the first sub-shaft sleeve 261 and the second gear 32 is formed on the third sub-shaft sleeve 361, the 3D printing technology, the laser etching process, and the numerical control machine tool processing technology can be used.

[0163] In the embodiment, the second sub-shaft sleeve 262 does not have the first demolding groove 263, and the fourth sub-shaft sleeve 362 does not have the second demolding groove 363, which makes the second sub-shaft sleeve 262 and the fourth sub-shaft sleeve 362 have enough matrixes to ensure the structural strength.

[0164] FIG. 24 is a partial schematic view of another example of the hinge assembly 100 provided by an embodiment of the present application. FIG. 25 is an exploded view of the hinge assembly 100 in FIG. 24.

[0165] The difference between the embodiment and the hinge assembly 10 in the above embodiment lies in the structure of the first swing arm 20', the second swing arm 30', the second support 52' and the synchronous assembly 40'. It should be noted that the base 10 is not shown in Figs. 24-25, but it can be understood that the two ends of the first connecting shaft 11 and the second connecting shaft 12 are respectively slidingly connected to the base 10 to support the first connecting shaft 11 and the second connecting shaft 12 through the base 10; the first idler gear 41 is provided with the first connecting rod 411 protruding from both ends in the axial direction of the first idler gear 41, the second idler gear 42 is provided with the second connecting rod 421 protruding from both ends in the axial direction of the second idler gear 42, and the two ends of the first connecting rod 411 and the second connecting rod 421 are respectively rotationally connected to the base 10, so that the base 10 supports the first idler gear 41 and the second idler gear 42.

[0166] Hereinafter, the differences of the hinge assembly 100 will be described in detail.

[0167] Fig. 26 is an enlarged view of the first swing arm 20' in Fig. 25. Fig. 27 is a schematic view of the first swing arm 20' in Fig. 26 from another perspective.

[0168] As shown in Figs. 26-27, in an embodiment provided by the present application, the first swing arm 20' is provided with the first shaft sleeve 26 rotationally connected to the first connecting shaft 11, and the first swing arm cam 21, the first gear 22 and the third swing arm cam 24 are all located in the first shaft sleeve 26. The second swing arm 30' is provided with the second shaft sleeve 36 rotationally connected to the second connecting shaft 12, and the second swing arm cam 31, the second gear 32 and the fourth swing arm cam 34 are all located in the second shaft sleeve 36.

[0169] In the embodiment, the first shaft sleeve 26 and the second shaft sleeve 36 are not split, so that the first shaft sleeve 26 and the second shaft sleeve 36 have sufficient bases, thereby being able to guarantee the structural strength of the first shaft sleeve 26 and the second shaft sleeve 36, guarantee the reliability of the rotational connection between the first swing arm 20' and the first connecting shaft 11, and guarantee the reliability of the rotational connection between the second swing arm 30' and the second connecting shaft 12.

[0170] As shown in Figs. 26-27, in an embodiment provided by the present application, the tooth groove of the first gear 22 does not penetrate through the side facing the third swing arm cam 24, and the tooth groove of the second gear 32 does not penetrate through the side facing the fourth swing arm cam 34.

[0171] In this embodiment, the tooth groove of the first gear 22 is not through on the side facing the third swing arm cam 24, so that the convex part of the third swing arm cam 24 has a complete surface type, and the convex part of the third swing arm cam 24 has sufficient structural strength, and the convex part of the third swing arm cam 24 is not easily extruded and deformed or worn by the convex part of the third cam 521, thereby increasing the reliability of the third swing arm cam 24. In addition, the convex part of the third swing arm cam 24 has a complete surface type, so that the convex part of the third swing arm cam 24 can slide smoothly on the convex part of the third cam 521, avoiding the situation that the third swing arm cam 24 is jammed and vibrates, thereby ensuring the stability of the first swing arm 20' during folding or unfolding. Correspondingly, the tooth groove of the second gear 32 is not through on the side facing the fourth swing arm cam 34, so that the reliability of the fourth swing arm cam 34 is increased and the situation that the fourth swing arm cam 34 is jammed and vibrates is avoided, thereby ensuring the stability of the second swing arm 30' during folding or unfolding.

[0172] As shown in FIGS. 26-27, in an embodiment provided by the present application, the tooth top of the first gear 22 is coplanar with the outer surface of the first shaft sleeve 26, and the tooth top of the second gear 32 is coplanar with the outer surface of the second shaft sleeve 36.

[0173] In this embodiment, the tooth top of the first gear 22 is prevented from sinking below the outer surface of the first shaft sleeve 26, so that the loss of too much base body of the first shaft sleeve 26 for forming the first gear 22 is reduced, thereby ensuring that the first shaft sleeve 26 has sufficient base body to ensure its structural strength. Correspondingly, the tooth top of the second gear 32 is prevented from sinking below the outer surface of the second shaft sleeve 36, so that the loss of too much base body of the second shaft sleeve 36 for forming the second gear 32 is reduced, thereby ensuring that the second shaft sleeve 36 has sufficient base body to ensure its structural strength. Overall, the structural strength of the first shaft sleeve 26 and the second shaft sleeve 36 is improved, the reliability of the rotational connection between the first swing arm 20' and the first connecting shaft 11 is ensured, and the reliability of the rotational connection between the second swing arm 30' and the second connecting shaft 12 is ensured.

[0174] FIG. 28 is an enlarged view of the synchronization assembly 40' in FIG. 25. FIG. 29 is an enlarged view of the second bracket 52' in FIG. 25.

[0175] As shown in FIGS. 28-29, in combination with FIG. 13, in an embodiment provided by the present application, the first idler wheel 41 is provided with a first connecting rod 411 protruding from both ends in the axial direction of the first idler wheel 41, and the second idler wheel 42 is provided with a second connecting rod 421 protruding from both ends in the axial direction of the second idler wheel 42. The first support 51 is provided with a third through hole 513 and a fourth through hole 514, and the second support 52’ is provided with a seventh through hole 523 and an eighth through hole 524. One end of the first connecting rod 411 is slidingly and rotatably connected to the third through hole 513, and the other end of the first connecting rod 411 is slidingly and rotatably connected to the seventh through hole 523. One end of the second connecting rod 421 is slidingly and rotatably connected to the fourth through hole 514, and the other end of the second connecting rod 421 is slidingly and rotatably connected to the eighth through hole 524.

[0176] As can be seen by comparing FIG. 18 and FIG. 28, since the synchronization assembly 40’ in the present embodiment is slidingly and rotatably connected to the second support 52’, the lengths of the connecting rods on the side of the second support 52’ of the synchronization assembly 40’, the first idler wheel 41 and the second idler wheel 42 are longer in the present embodiment. In addition, as can be seen by comparing FIG. 19 and FIG. 29, the second support 52’ is additionally provided with the seventh through hole 523 and the eighth through hole 524 for slidingly and rotatably connecting with the synchronization assembly 40’.

[0177] In the present embodiment, the rotational connection design of the first idler wheel 41 with the first support 51 and the second support 52’ is specifically given, and the rotational connection design of the second idler wheel 42 with the first support 51 and the second support 52’ is specifically given. Since the first support 51 will be pressed and moved by the first swing arm cam 21 and the second swing arm cam 31, the first idler wheel 41 and the first support 51 need to be designed to slide relative to each other, and the second idler wheel 42 and the first support 51 need to be designed to slide relative to each other. Since the second support 52’ will be pressed and moved by the third swing arm cam 24 and the fourth swing arm cam 34, the first idler wheel 41 and the second support 52’ need to be designed to slide relative to each other, and the second idler wheel 42 and the second support 52’ need to be designed to slide relative to each other.

[0178] In an embodiment provided by the present application, the elastic member 54 can be two cylindrical springs sleeved on the outside of the first connecting shaft 11 and the second connecting shaft 12.

[0179] In the present embodiment, the elastic member 54 is a cylindrical spring, and is sleeved on the outside of the first connecting shaft 11 and the second connecting shaft 12, and is constrained on the connecting shafts by the structural characteristics of the spring itself, so that the spring can be better guided to deform in the axial direction of the connecting shafts, and the situation of the spring being skewed and stuck is avoided. The material of the spring can include but is not limited to a metal material with good toughness. The metal material can include but is not limited to stainless steel or spring steel (such as 65Mn steel).

[0180] In some other embodiments provided in the present application, the elastic member 54 can also be a flat spring, an S-shaped spring, a rubber block, etc.

[0181] In an embodiment provided in the present application, each component in the hinge assembly 100 can also be manufactured by a powder injection molding process. The powder injection molding process is a branch of metallurgy and material science, which mainly uses metal powder (including a small amount of non-metal powder) as raw material to manufacture materials and products by a "forming + sintering" method, and is a near-net forming process for producing complex components at a lower cost. The powder injection molding is divided into two categories: metal injection molding (MIM) and ceramic injection molding (CIM). The powder injection molding process has obvious advantages in manufacturing high-precision, high-strength, and high-precision structural components and appearance components with fine appearance.

[0182] Finally, it should be noted that the above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any change or replacement within the technical scope disclosed in the present application should be covered within 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 base (10) is provided with a first connecting shaft (11) and a second connecting shaft (12); the first swing arm (20) is rotatably connected to the first connecting shaft (11), and is provided with a first gear wheel (22) with teeth protruding radially along the first connecting shaft (11), and a first swing arm cam (21) with a protruding part protruding axially along the first connecting shaft (11); the second swing arm (30) is rotatably connected to the second connecting shaft (12), and is provided with a second gear wheel (32) with teeth protruding radially along the second connecting shaft (12), and a second swing arm cam (31) with a protruding part protruding axially along the second connecting shaft (12); the synchronous assembly (40) comprises a first idler gear (41) and a second idler gear (42), and the first gear wheel (22), the first idler gear (41), the second idler gear (42) and the second gear wheel (32) are sequentially meshed; the damping assembly (50) comprises an elastic member (54) and a first support (51), the first support (51) is provided with a first cam (511) meshing with the first swing arm cam (21), and a second cam (512) meshing with the second swing arm cam (31), wherein the first support (51) can directly or indirectly press the elastic member (54) under the drive of the first swing arm cam (21) and the second swing arm cam (31); wherein the tooth groove of the first gear wheel (22) does not pass through on the side facing the first swing arm cam (21), and the tooth groove of the second gear wheel (32) does not pass through on the side facing the second swing arm cam (31). The side of the first swing arm (20) facing away from the first swing arm cam (21) is provided with a third swing arm cam (24), the protruding part of the third swing arm cam (24) protrudes axially along the first connecting shaft (11), the side of the second swing arm (30) facing away from the second swing arm cam (31) is provided with a fourth swing arm cam (34), the protruding part of the fourth swing arm cam (34) protrudes axially along the second connecting shaft (12); The damping assembly (50) further comprises a second support (52), the second support (52) is provided with a third cam (521) meshing with the third swing arm cam (24), and is further provided with a fourth cam (522) meshing with the fourth swing arm cam (34), and the second support (52) can press the elastic member (54) under the drive of the third swing arm cam (24) and the fourth swing arm cam (34). The damping assembly (50) further comprises a third support (53), and the third support (53) is located at the end of the elastic member (54) facing away from the second support (52). ​ ​ ​ 2. The hinge assembly of claim 1, wherein, ​ ​ 3. The hinge assembly of claim 2, wherein, ​ One end of the first connecting shaft (11) and the second connecting shaft (12) is fixed with the third support (53), and the other end of the first connecting shaft (11) and the second connecting shaft (12) is fixed with the first support (51), under the drive of the first swing arm cam (21) and the second swing arm cam (31), the first support (51) drives the first connecting shaft (11) and the second connecting shaft (12) to slide relative to the base (10), so that the third support (53) extrudes the elastic member (54).

4. The hinge assembly of claim 2 or 3, wherein, The first swing arm (20) is provided with a first shaft sleeve (26) rotatably connected with the first connecting shaft (11), the first shaft sleeve (26) comprises a first sub-shaft sleeve (261) and a second sub-shaft sleeve (262), the first sub-shaft sleeve (261) and the second sub-shaft sleeve (262) have a first interval slot (25) therebetween, the first swing arm cam (21) and the first gear (22) are located in the first sub-shaft sleeve (261), and the third swing arm cam (24) is located in the second sub-shaft sleeve (262). The second swing arm (30) is provided with a second shaft sleeve (36) rotatably connected with the second connecting shaft (12), the second shaft sleeve (36) comprises a third sub-shaft sleeve (361) and a fourth sub-shaft sleeve (362), the third sub-shaft sleeve (361) and the fourth sub-shaft sleeve (362) have a second interval slot (35) therebetween, the second swing arm cam (31) and the second gear (32) are located in the third sub-shaft sleeve (361), and the fourth swing arm cam (34) is located in the fourth sub-shaft sleeve (362).

5. The hinge assembly of claim 4, wherein, The tooth top of the first gear (22) is coplanar with the outer surface of the first sub-shaft sleeve (261), and the tooth top of the second gear (32) is coplanar with the outer surface of the third sub-shaft sleeve (361).

6. The hinge assembly of claim 4 or 5, wherein, The tooth groove of the first gear (22) penetrates one side of the first interval slot (25), the second sub-shaft sleeve (262) has a first demolding groove (263) penetrating one side of the first interval slot (25), the tooth groove of the second gear (32) penetrates one side of the second interval slot (35), and the fourth sub-shaft sleeve (362) has a second demolding groove (363) penetrating one side of the second interval slot (35).

7. The hinge assembly of claim 6, wherein, The first demolding groove (263) does not penetrate one side of the third swing arm cam (24), and the second demolding groove (363) does not penetrate one side of the fourth swing arm cam (34).

8. The hinge assembly of claim 6 or 7, wherein, The groove bottom of the first demolding groove (263) is coplanar with the tooth root of the first gear (22), and the groove bottom of the second demolding groove (363) is coplanar with the tooth root of the second gear (32).

9. The hinge assembly of any one of claims 4-8, wherein, The base (10) is provided with a support block (13) located in the first spacing groove (25) and the second spacing groove (35), the support block (13) is provided with a first through hole (131) and a second through hole (132), the first connecting shaft (11) is slidingly connected in the first through hole (131), and the second connecting shaft (12) is slidingly connected in the second through hole (132).

10. The hinge assembly of claim 9, wherein, The support block (13) is provided with a first stop surface (14) and a second stop surface (15), the first spacing groove (25) is provided with a first matching surface (28), the second spacing groove (35) is provided with a second matching surface (38), and the first matching surface (28) and the first stop surface (14) abut against each other and the second matching surface (38) and the second stop surface (15) abut against each other when the first swing arm (20) and the second swing arm (30) are rotated to the unfolded state.

11. The hinge assembly of claim 9 or 10, wherein, The first idler (41) is provided with a first connecting rod (411) protruding from both ends in the axial direction of the first idler (41), and the second idler (42) is provided with a second connecting rod (421) protruding from both ends in the axial direction of the second idler (42). The first support (51) is provided with a third through hole (513) and a fourth through hole (514), the support block (13) is provided with a fifth through hole (133) and a sixth through hole (134), one end of the first connecting rod (411) is slidingly and rotatably connected in the third through hole (513), the other end of the first connecting rod (411) is rotatably connected in the fifth through hole (133), one end of the second connecting rod (421) is slidingly and rotatably connected in the fourth through hole (514), and the other end of the second connecting rod (421) is rotatably connected in the sixth through hole (134).

12. The hinge assembly of claim 2 or 3, wherein, The first swing arm (20) is provided with a first shaft sleeve (26) rotatably connected with the first connecting shaft (11), and the first swing arm cam (21), the first gear (22) and the third swing arm cam (24) are located in the first shaft sleeve (26). The second swing arm (30) is provided with a second shaft sleeve (36) rotatably connected with the second connecting shaft (12), and the second swing arm cam (31), the second gear (32) and the fourth swing arm cam (34) are located in the second shaft sleeve (36).

13. The hinge assembly of claim 12, wherein, The gear groove of the first gear (22) is not through on the side facing the third swing arm cam (24), and the gear groove of the second gear (32) is not through on the side facing the fourth swing arm cam (34).

14. The hinge assembly of claim 12 or 13, wherein, The tooth top of the first gear (22) is coplanar with the outer surface of the first shaft sleeve (26), and the tooth top of the second gear (32) is coplanar with the outer surface of the second shaft sleeve (36).

15. The hinge assembly of any one of claims 12-14, wherein, The first idler (41) is provided with a first connecting rod (411) protruding from both ends in the axial direction of the first idler (41), and the second idler (42) is provided with a second connecting rod (421) protruding from both ends in the axial direction of the second idler (42). The first support (51) is provided with a third through hole (513) and a fourth through hole (514), the second support (52) is provided with a seventh through hole (523) and an eighth through hole (524), one end of the first connecting rod (411) is slidably and rotatably connected in the third through hole (513), the other end of the first connecting rod (411) is slidably and rotatably connected in the seventh through hole (523), one end of the second connecting rod (421) is slidably and rotatably connected in the fourth through hole (514), one end of the second connecting rod (421) is slidably and rotatably connected in the eighth through hole (524).

16. The hinge assembly of any one of claims 2-15, wherein, The second support (52) is provided with a ninth through hole (525) and a tenth through hole (526), the first connecting shaft (11) is slidably connected in the ninth through hole (525), the second connecting shaft (12) is slidably connected in the tenth through hole (526).

17. An electronic device, comprising: A hinge assembly (100) as claimed in any one of claims 1-16, a first housing (200), a second housing (300), and a screen (400), the hinge assembly (100) being connected between the first housing (200) and the second housing (300), the screen (400) being disposed on a side of the first housing (200), the hinge assembly (100), and the second housing (300).

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