Hinge mechanism and electronic device

Abstract

The application discloses a hinge mechanism and an electronic device, and belongs to the field of electronic devices. In the hinge mechanism, a first swing arm and a second swing arm are respectively rotationally connected to opposite sides of a base, and a first matching sliding block and a second matching sliding block are both slidingly connected to the base. A first inclined surface of the first swing arm is opposite and matched with a third inclined surface of the first matching sliding block, and a second inclined surface of the second swing arm is opposite and matched with a fourth inclined surface of the second matching sliding block. In the case that the first swing arm rotates relative to the base, the first inclined surface pushes the third inclined surface, so as to drive the first matching sliding block and the second matching sliding block to move in the direction of the axis of the hinge mechanism and towards the first end of the base, and the fourth inclined surface pushes the second inclined surface, so as to drive the second swing arm to rotate relative to the base. Correspondingly, in the case that the second swing arm rotates relative to the base, the first swing arm can also be driven to rotate relative to the base.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, specifically relating to a hinge mechanism and an electronic device. Background Technology

[0002] Foldable phones are becoming increasingly popular due to their combination of large display area and high portability. The hinge mechanism in a foldable phone provides the ability to fold and unfold. It typically includes a base and hinge arms rotatably connected to opposite sides of the base. To ensure that the two halves of the device rotate at roughly the same angle relative to the base, thus extending the lifespan of the display and improving the user experience, current hinge mechanisms usually incorporate a synchronization component. This synchronization component generally includes multiple synchronization arms, which can rotate synchronously relative to each other via gear sets or similar structures. However, due to the limitations of the gear structure itself, this type of hinge mechanism is usually relatively thick, which contradicts the current trend of thinner and lighter electronic devices. Summary of the Invention

[0003] The purpose of this application is to provide a hinge mechanism and an electronic device to solve the problem of the relatively large thickness of current hinge mechanisms.

[0004] In a first aspect, embodiments of this application provide a hinge mechanism, which includes a base, a first swing arm, a second swing arm, a first mating slider, and a second mating slider. The first swing arm and the second swing arm are rotatably connected to opposite sides of the base, and the first mating slider and the second mating slider are slidably connected to the base.

[0005] The first swing arm has a first inclined surface, the second swing arm has a second inclined surface, the first mating slider has a third inclined surface, and the second mating slider has a fourth inclined surface; the first inclined surface is opposite to and mating with the third inclined surface, and the second inclined surface is opposite to and mating with the fourth inclined surface;

[0006] When the first swing arm rotates relative to the base, the first inclined surface pushes the third inclined surface to drive the first and second mating sliders to move along the axial direction of the hinge mechanism toward the first end of the base, and the fourth inclined surface pushes the second inclined surface to drive the second swing arm to rotate relative to the base.

[0007] When the second swing arm rotates relative to the base, the second inclined surface pushes the fourth inclined surface to drive the first and second mating sliders to move along the axial direction of the hinge mechanism toward the second end of the base away from its first end, and the third inclined surface pushes the first inclined surface to drive the first swing arm to rotate relative to the base.

[0008] Secondly, embodiments of this application disclose an electronic device that includes the aforementioned hinge mechanism.

[0009] This application discloses a hinge mechanism in which a first swing arm and a second swing arm are rotatably connected to opposite sides of a base. A first mating slider and a second mating slider, fixed relative to each other along the axial direction of the hinge mechanism, are also slidably mounted on the base. The first swing arm, the second swing arm, the first mating slider, and the second mating slider are each provided with a first inclined surface, a second inclined surface, a third inclined surface, and a fourth inclined surface, respectively. The first inclined surface is opposite to the third inclined surface, and the second inclined surface is opposite to the fourth inclined surface. This allows the first swing arm and the first mating slider, as well as the second swing arm and the second mating slider, to switch between linear motion and rotational motion relative to the base, thereby enabling the first and second swing arms to rotate synchronously relative to the base. Furthermore, by making the third and fourth inclined surfaces opposite to each other along the axial direction of the hinge mechanism, the axial force of the hinge mechanism can be sequentially transmitted among the first swing arm, the first mating slider (and the second mating slider), and the second swing arm, thus ensuring that the first and second swing arms can rotate synchronously relative to the base. Furthermore, in the hinge mechanism disclosed in the embodiments of this application, since the first and second mating sliders are not gear-type structural components, the thickness of the first and second mating sliders can be reduced to a certain extent during the design process (i.e., the dimensions of the two sliders in the thickness direction of the base, or the dimensions in the direction of the thickness direction of the electronic device in the unfolded state). This allows the thickness of the entire hinge mechanism to be relatively small, which is beneficial for the electronic devices using the aforementioned hinge mechanism to develop towards thinner and lighter designs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the hinge mechanism disclosed in the embodiments of this application;

[0011] Figure 2 This is a schematic diagram of the hinge mechanism disclosed in the embodiments of this application in another direction;

[0012] Figure 3 This is an exploded view of the hinge mechanism disclosed in the embodiments of this application;

[0013] Figure 4 This is a schematic diagram of the structure of the base in the hinge mechanism disclosed in the embodiments of this application;

[0014] Figure 5 This is a schematic diagram of the base in another direction of the hinge mechanism disclosed in the embodiments of this application;

[0015] Figure 6This is a schematic diagram of the hinge mechanism disclosed in the embodiments of this application in a folded state;

[0016] Figure 7 This is a schematic diagram of the hinge mechanism disclosed in the embodiments of this application in the unfolded state;

[0017] Figure 8 This is a schematic diagram of the hinge mechanism disclosed in the embodiments of this application in the unfolded state in another direction;

[0018] Figure 9 This is a cross-sectional schematic diagram of a portion of the structure of the electronic device disclosed in the embodiments of this application.

[0019] The attached diagram is described as follows:

[0020] 100 - Base, 110 - Bushing, 111 - Rotating groove, 111a - Demolding notch, 111b - Weight reduction notch, 120 - Support plate

[0021] 201-First swing arm, 202-Second swing arm, 210-First arm body, 211-First rotating part, 211a-First inclined surface, 212-First connecting part, 220-Second arm body, 221-Second rotating part, 221a-Second inclined surface, 222-Second connecting part

[0022] 301 - First mating slider, 302 - Second mating slider, 310 - Third inclined plane, 320 - Fourth inclined plane.

[0023] 410 - Elastic element, 420 - Cam element, 430 - Synchronous shaft, 440 - Mounting bracket, 450 - Fixed bracket, 460 - Snap ring,

[0024] 501 - Axial limiting structure, 510 - First bracket, 520 - Second bracket

[0025] 611 - First rotating swing arm, 612 - Second rotating swing arm, 620 - Rotating pin,

[0026] 710 - First door panel, 720 - Second door panel

[0027] 800-medium plate,

[0028] 900-Flexible screen. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] like Figures 1-8 As shown in the figure, this application discloses a hinge mechanism that can be applied to electronic devices to enable the devices to fold and unfold, thereby achieving both a larger display area and stronger portability. The hinge mechanism includes a base 100, a first swing arm 201, a second swing arm 202, a first mating slider 301, and a second mating slider 302. Alternatively, the hinge mechanism may include a first rotating swing arm 611 and a second rotating swing arm 612, allowing the hinge mechanism to connect to a first housing and a second housing (not shown in the figure) in the electronic device, respectively, so that when the first housing and / or the second housing in the electronic device are subjected to force, the force can be transmitted through the first rotating swing arm 611 and the second rotating swing arm 612 to the first swing arm 201 and the second swing arm 202, respectively, thereby causing the hinge mechanism to fold and unfold.

[0032] More specifically, the hinge mechanism may further include a first bracket 510 and a second bracket 520. The first bracket 510 may be fixedly mounted on the first housing, and the second bracket 520 may be fixedly mounted on the second housing. One end of the first rotating arm 611 may be rotatably mounted on the base 100 via a rotating pin 620, and the other end may be rotatably mounted on the first bracket 510. Correspondingly, one end of the second rotating arm 612 may also be rotatably mounted on the base 100 via another rotating pin 620, and the other end of the second rotating arm 612 may be rotatably mounted on the second bracket 520.

[0033] Based on this, the hinge mechanism may further include a first door panel 710 and a second door panel 720, which are respectively disposed on opposite sides of the base 100. The ends of the first door panel 710 and the second door panel 720 away from the base 100 are respectively rotatably connected to the first bracket 510 and the second bracket 520, so that when the hinge mechanism is in a folded state, as... Figure 9As shown, the first door panel 710 and the second door panel 720 can form a flared structure, with the flare facing the direction of the base 100. This provides a larger accommodating space for the bent portion of the flexible screen 900, preventing the flexible screen 900 from being squeezed and damaged, and extending the service life of the flexible screen 900. Correspondingly, when the hinge mechanism is in the unfolded state, devices such as the first rotating arm 611 and the second rotating arm 612 can be used to provide support for the first door panel 710 and the second door panel 720, making the supporting surfaces of the first door panel 710 and the second door panel 720 coplanar, and providing support for the flexible screen 900, thereby improving the display effect and service life of the flexible screen 900.

[0034] In the hinge mechanism disclosed in this application embodiment, the first swing arm 201 and the second swing arm 202 are rotatably connected to opposite sides of the base 100. Correspondingly, when the hinge mechanism is applied in an electronic device, the first swing arm 201 and the second swing arm 202 are also directly or indirectly connected to the first housing and the second housing of the electronic device, thereby enabling the first housing and the second housing to rotate synchronously relative to the base 100. Optionally, through a structure such as a pin, both the first swing arm 201 and the second swing arm 202 can be rotatably mounted on the base 100.

[0035] Furthermore, the first mating slider 301 and the second mating slider 302 in the hinge mechanism are relatively fixed in the axial direction of the hinge mechanism, and both are slidably connected to the base 100. Therefore, when they move relative to the base 100 along the axial direction of the hinge mechanism, the movement distance and direction of the first mating slider 301 and the second mating slider 302 are the same. Specifically, the first mating slider 301 and the second mating slider 302 can be integrally formed, ensuring that they are connected as one piece, thus enabling the first mating slider 301 and the second mating slider 302 to form a relatively fixed relationship in the axial direction of the hinge mechanism. Alternatively, the first mating slider 301 and the second mating slider 302 can be separately formed, and a connecting member or other structure can be used to provide a fixing effect for the first mating slider 301 and the second mating slider 302 in the axial direction of the hinge mechanism.

[0036] At the same time, such as Figure 1-3 As shown, the first swing arm 201 has a first inclined surface 211a, the second swing arm 202 has a second inclined surface 221a, the first mating slider 301 has a third inclined surface 310, and the second mating slider 302 has a fourth inclined surface 320. The first inclined surface 211a and the third inclined surface 310 are opposite to and mating along the aforementioned axial direction, and the second inclined surface 221a and the fourth inclined surface 320 are opposite to and mating along the aforementioned axial direction. That is, the first swing arm 201 and the first mating slider 301 correspond to and mat with each other, and the second swing arm 202 and the second mating slider 302 correspond to and mat with each other.

[0037] Specifically, the first inclined surface 211a, the second inclined surface 221a, the third inclined surface 310, and the fourth inclined surface 320 are all surfaces inclined relative to the axial direction of the hinge mechanism. Two of these surfaces, arranged opposite each other, are capable of cooperating. When one of the cooperating surfaces rotates relative to the base 100, the contact relationship between their inclined surfaces can convert the rotational motion of one into the axial motion of the other. That is, when one of the cooperating devices (such as the first swing arm 201 and the first mating slider 301, or the second swing arm 202 and the second mating slider 302) rotates relative to the base along the axial direction of the hinge mechanism, the inclined surface relationship between the two devices can be used to make the other move linearly relative to the base along the axial direction of the hinge mechanism. Conversely, when one of the two devices moves linearly relative to the base, the other can also rotate relative to the base.

[0038] Accordingly, based on the different parameters of the aforementioned mating surfaces and the different rotation directions of the first swing arm 201 and the second swing arm 202 relative to the base 100, during the relative rotation of the two mating devices along the axial direction, the two mating devices will generate a mutual approaching action or a mutual moving away action along the axial direction.

[0039] Meanwhile, in order to ensure that the first swing arm 201 and the second swing arm 202 have the ability to rotate synchronously relative to the base 100, in this embodiment of the application, the third inclined surface 310 and the fourth inclined surface 320 are arranged opposite to each other along the axial direction of the hinge mechanism. In other words, taking the first end of the first mating slider 301 and the first end of the second mating slider 302 as an example, the third inclined surface 310 can be arranged at the first end of the first mating slider 301, and the fourth inclined surface 320 can be arranged at the second end of the second mating slider 302. That is, in the axial direction of the hinge mechanism, the third inclined surface 310 and the fourth inclined surface 320 are oriented in opposite directions, thereby enabling the first inclined surface 211a to be arranged on the side of the third inclined surface 310 away from the first mating slider 301, and the second inclined surface 221a to be arranged on the side of the fourth inclined surface 320 away from the second mating slider 302.

[0040] When the above technical solution is adopted, taking the first swing arm 201 as the active driving component as an example, the first swing arm 201 can push the third inclined surface 310 along the aforementioned axial direction relative to the base through its first inclined surface 211a. Taking the two as moving away from each other as an example, the first swing arm 201 can drive the first mating slider 301 to move away from the aforementioned first inclined surface 211a along the aforementioned axial direction. In this case, the first mating slider 301 can also drive the second mating slider 302 to move away from the aforementioned first inclined surface 211a, so that the second mating slider 302 can apply an axial driving force to the second swing arm 202. Under the action of the mating relationship between the fourth inclined surface 320 and the second inclined surface 221a, the second swing arm 202 can passively rotate relative to the base 100 to provide clearance space for the axial movement of the second mating slider 302.

[0041] In summary, when the first swing arm 201 rotates relative to the base 100 as the active driving member, the first inclined surface 211a can push the third inclined surface 310, so that the first swing arm 201 can transmit its rotational motion to the first mating slider 301, and drive the first mating slider 301 and the second mating slider 302 to move along the axial direction of the hinge mechanism towards the first end of the base 100; at the same time, the linear motion force of the second mating slider 302 can act on the second swing arm 202, thereby pushing the second inclined surface 221a through the fourth inclined surface 320, so as to drive the second swing arm 202 to rotate relative to the base 100, so that the second swing arm 202 and the first swing arm 201 have the ability to rotate synchronously relative to the base 100.

[0042] Conversely, when the second swing arm 202 rotates relative to the base 100 as the active driving member, the second inclined surface 221a can push the fourth inclined surface 320 so that the second swing arm 202 can transmit its rotational motion to the second mating slider 302 and drive the second mating slider 302 and the first mating slider 301 to move along the axial direction of the hinge mechanism towards the second end of the base 100; at the same time, the linear motion force of the first mating slider 301 can act on the first swing arm 201, thereby pushing the first inclined surface 211a through the third inclined surface 310 to drive the first swing arm 201 to rotate relative to the base 100, so that the second swing arm 202 and the first swing arm 201 have the ability to rotate synchronously relative to the base 100.

[0043] In the above description, the above technical effect can be achieved by designing the tilting directions of the first inclined surface 211a, the third inclined surface 310, the second inclined surface 221a and the fourth inclined surface 320 in the hinge mechanism.

[0044] Regarding the above technical solution, another explanation is given below.

[0045] When the hinge mechanism is in the unfolded state, along the axial direction, the distance between the first mating slider 301 and the end of the first swing arm 201 away from the first inclined surface 211a is the first distance, and the distance between the second mating slider 302 and the end of the second swing arm 202 away from the second inclined surface 221a is the second distance; when the hinge mechanism is in the folded state, along the axial direction, the distance between the first mating slider 301 and the end of the first swing arm 201 away from the first inclined surface 211a is the third distance, and the distance between the second mating slider 302 and the end of the second swing arm 202 away from the second inclined surface 221a is the fourth distance; and the third distance is less than the first distance, and the fourth distance is greater than the second distance.

[0046] In other words, during the transition of the hinge mechanism from the unfolded state to the folded state, the second swing arm 202 can act as an active driving component. It can drive the second mating slider 302 and the first mating slider 301 to move axially relative to the base 100 and away from the second swing arm 202 by rotating relative to the base 100. This increases the distance between the second mating slider 302 and the end of the second swing arm 202 away from the second inclined surface 221a from the second distance to the fourth distance, and reduces the distance between the first mating slider 301 and the end of the first swing arm 201 away from the first inclined surface 211a from the first distance to the third distance. Correspondingly, under the linear action of the first mating slider 301, the first swing arm 201 rotates relative to the base 100 to avoid the first mating slider 301, thus achieving the purpose of the first swing arm 201 and the second swing arm 202 rotating synchronously relative to the base 100.

[0047] Correspondingly, during the process of the hinge mechanism switching from the folded state to the unfolded state, the first swing arm 201 can be used as the active driving member, and the rotation of the first swing arm 201 can be applied to the first mating slider 301, switching to the linear movement of the first mating slider 301 and the second mating slider 302, which in turn acts on the second swing arm 202, causing the second swing arm 202 to rotate relative to the base 100.

[0048] This application discloses a hinge mechanism in which a first swing arm 201 and a second swing arm 202 are rotatably connected to opposite sides of a base 100. A first mating slider 301 and a second mating slider 302, which are slidably mounted on the base 100 and fixed relative to each other along the axial direction of the hinge mechanism, are also provided. The first swing arm 201, the second swing arm 202, the first mating slider 301, and the second mating slider 302 are respectively provided with a first inclined surface 211a, a second inclined surface 221a, a third inclined surface 310, and a fourth inclined surface 320. Furthermore, the first inclined surface 211a is opposite to and engages with the third inclined surface 310, and the second inclined surface 221a is opposite to and engages with the fourth inclined surface 320. This allows the first swing arm 201 and the first engaging slider 301, as well as the second swing arm 202 and the second engaging slider 302, to switch between linear motion and rotational motion relative to the base 100. This enables the first swing arm 201 and the second swing arm 202 to rotate synchronously relative to the base 100. Simultaneously, by setting the third inclined surface 310 and the fourth inclined surface 320 opposite to each other along the axial direction of the hinge mechanism, the axial force of the hinge mechanism can be sequentially transmitted among the first swing arm 201, the first engaging slider 301 (and the second engaging slider 302), and the second swing arm 202, thereby ensuring that the first swing arm 201 and the second swing arm 202 can rotate synchronously relative to the base 100.

[0049] Furthermore, in the hinge mechanism disclosed in the embodiments of this application, since the first mating slider 301 and the second mating slider 302 are not gear-type structural components, the thickness of the first mating slider 301 and the second mating slider 302 can be reduced to a certain extent during the design process (i.e., the dimensions of the two in the thickness direction of the base 100, or the dimensions in the thickness direction of the electronic device in the unfolded state). As a result, the thickness of the entire hinge mechanism can be relatively small, which is beneficial for the electronic device using the aforementioned hinge mechanism to develop towards thinner and lighter designs.

[0050] Based on the hinge mechanism with the above structure disclosed in the embodiments of this application, further, when the hinge mechanism is in one of the unfolded state and the folded state, the fourth inclined surface 320 is in contact with the second inclined surface 221a; correspondingly, when the hinge mechanism is in the other of the unfolded state and the folded state, the third inclined surface 310 is in contact with the first inclined surface 211a.

[0051] For example, when the hinge mechanism is in the unfolded state, the distance between the second swing arm 202 and the second mating slider 302 can be minimized. Correspondingly, when the hinge mechanism is in the folded state, the distance between the first swing arm 201 and the first mating slider 301 can be minimized. By adopting the above technical solution, on the one hand, the interaction effect between corresponding components of the first swing arm 201, second swing arm 202, first mating slider 301, and second mating slider 302 when the hinge mechanism is in a critical state can be reduced, thus improving the service life of each component. On the other hand, the overall axial dimension of the hinge mechanism can be made relatively small.

[0052] Furthermore, in the aforementioned hinge mechanism, since the third inclined surface 310 and the fourth inclined surface 320 are arranged opposite each other along the aforementioned axial direction, in order to make the overall hinge structure's axial dimension relatively smaller, the lengths of the first mating slider 301 and the second mating slider 302 can be made substantially equal, and they can be distributed in a direction perpendicular to the axial direction of the hinge mechanism. That is, they can be arranged substantially flush along the axial direction of the hinge mechanism. In this case, the sum of the dimensions occupied by the first mating slider 301 and the second mating slider 302 along the axial direction of the hinge mechanism is relatively small, thereby reducing the axial dimension of the hinge mechanism itself.

[0053] To further improve the usability of the hinge mechanism and the corresponding electronic device, the hinge mechanism disclosed in this application embodiment may optionally include a damping mechanism, so as to enable the hinge mechanism and electronic device to have the ability to hover, that is, to enable the electronic device to hover in other states between the unfolded state and the folded state, thereby improving the usability of the device and thus improving the user experience.

[0054] Specifically, the damping mechanism can provide stepless hovering for the hinge mechanism. In another embodiment of this application, the damping mechanism includes an elastic element 410 and a cam element 420. Both the end of the first swing arm 201 facing away from the first inclined surface 211a and the cam element 420 are provided with cam surfaces. The cam surfaces of the first swing arm 201 and the corresponding cam element 420 are arranged opposite to each other. That is, the end of the first swing arm 201 facing away from the first inclined surface 211a engages with the cam of the cam element 420, so that during relative rotation, the cam surfaces of the two elements can interact to increase or decrease the axial distance between them. The cam surface is a surface structure comprising multiple smoothly connected protrusions and recesses. The distance between the two cam surfaces is largest when their protrusions are opposite to each other, and smallest when one protrusion and the other recess are opposite to each other. Therefore, during relative rotation of the two oppositely arranged cam surfaces, the distance between them can increase or decrease accordingly.

[0055] Simultaneously, in the axial direction of the hinge mechanism, one end of the elastic element 410 can be connected to the side of the cam element 420 away from its cam surface, and the other end of the elastic element 410 can be fixed relative to the base 100, thereby using the elastic element 410 to give the cam element 420 a damping effect. Of course, in the process of arranging the elastic element 410, the length of the elastic element 410 or the elastic state of the elastic element 410 needs to be determined according to the matching relationship between the two opposing cam surfaces. More specifically, as the cam surfaces of the first rocker arm 201 and its corresponding cam element 420 move away from each other, it is necessary to ensure that the elastic element 410 can be compressed or stretched. That is, as the cam surfaces move away from each other, the elastic element 410 stores elastic potential energy, and then, as the two opposing cam surfaces continue to rotate, and after the protrusion of one cam surface passes over the protrusion of the other cam surface, under the elastic action of the elastic element 410, the two cam surfaces can be driven to continue rotating relative to each other until the protrusion of one cam surface is directly opposite the concave part of the other cam surface.

[0056] That is, in the hinge mechanism disclosed in the above embodiments, when the protrusion of one cam surface is directly opposite the concave part of another cam surface, if it is necessary to make the two cam surfaces rotate relative to each other, it is necessary to overcome the elastic force of the elastic element 410. This enables the hinge mechanism to have damping capability, and by controlling the specific parameters of the cam surface, the hinge mechanism can have the hovering capability of the corresponding angle. This article does not limit this.

[0057] More specifically, the elastic element 410 can be a compression spring, and it can be positioned on the side of the cam element 420 corresponding to the first rocker arm 201 away from the first rocker arm 201. This allows one end of the elastic element 410 to abut against the side of the cam element 420 away from its cam surface, and the other end of the elastic element 410 to be fixedly connected to the base 100 by abutment or other means. This ensures that the elastic element 410 can stably provide elasticity and reduces the installation difficulty of the elastic element 410 and the layout difficulty of other components in the hinge mechanism. For ease of description, the following description assumes that the elastic element 410 adopts the technical solution disclosed in this embodiment.

[0058] Based on the above embodiments, the first swing arm 201 can further have a second inclined surface 221a, and the second swing arm 202 can also have the first inclined surface 211a. The first mating slider 301 can also have the fourth inclined surface 320, and the second mating slider 302 can also have the fourth inclined surface 320. In this case, whether the hinge mechanism switches from the unfolded state to the folded state or from the folded state to the unfolded state, the first swing arm 201 and the second swing arm 202 can be used as active driving components independently, thereby reducing the difficulty of using the hinge mechanism and its vulnerability, and improving the user experience.

[0059] More specifically, when the first mating slider 301 has a third inclined surface 310 and a fourth inclined surface 320, the first swing arm 201 corresponding to the first mating slider 301 has a first inclined surface 211a and a second inclined surface 221a. In the aforementioned axial direction, the first mating slider 301 can be sandwiched between the first inclined surface 211a and the second inclined surface 221a of the first swing arm 201. Simultaneously, the first inclined surface 211a of the first swing arm 201 is opposite to and engages with the third inclined surface 310 of the first mating slider 301, and the second inclined surface 221a of the first swing arm 201 is opposite to and engages with the fourth inclined surface 320 of the first mating slider 301. Similarly, the second mating slider 302 can be sandwiched between the first inclined surface 211a and the second inclined surface 221a of the second swing arm 202, with their respective inclined surfaces correspondingly opposite each other and engaging with each other.

[0060] Furthermore, as mentioned above, the dimensions of the first mating slider 301 and the second mating slider 302 can be made approximately equal, and they can be arranged substantially flush in the axial direction to reduce the overall axial dimension of the hinge mechanism. Based on this, during the arrangement of the first swing arm 201 and the second swing arm 202, they can also be arranged flush in a direction perpendicular to the axial direction, so that the first swing arm 201 and the second swing arm 202 are also substantially flush in the axial direction, making the axial dimension of the hinge mechanism relatively small.

[0061] As described above, the first inclined surface 211a and the second inclined surface 221a of the first swing arm 201 and the second swing arm 202 are spaced apart from each other in the axial direction. Therefore, the first swing arm 201 and the second swing arm 202 can each include two parts distributed along the axial direction, and the first inclined surface 211a and the second inclined surface 221a are respectively disposed on the aforementioned two parts. Correspondingly, by providing a connecting structure on the outside of the aforementioned two parts, on the one hand, the aforementioned two parts can form a relatively fixed relationship in the axial direction of the hinge mechanism, and on the other hand, the aforementioned connecting structure can be used to make the first swing arm 201 and the second swing arm 202 form a linkage relationship with the first housing and the second housing in the electronic device, respectively.

[0062] In another embodiment of this application, optionally, the first swing arm 201 includes a first arm body 210 and a second arm body 220. The first arm body 210 includes a first rotating portion 211 and a first connecting portion 212 fixedly connected. The second arm body 220 includes a second rotating portion 221 and a second connecting portion 222 fixedly connected. The first rotating portion 211 has a first inclined surface 211a, and the second rotating portion 221 has a second inclined surface 221a. Furthermore, by rotatably connecting both the first rotating portion 211 and the second rotating portion 221 to the base 100, both the first arm body 210 and the second arm body 220 can form a rotational engagement relationship with the base 100. In addition, as mentioned above, the first swing arm 201 can also be directly or indirectly connected to the first housing of the electronic device. Based on this, the hinge mechanism disclosed in this application embodiment also includes a first bracket 510. By making the first connecting part 212 and the second connecting part 222 slide and engage with the first bracket 510 in a direction perpendicular to the axial direction, and by fixing the first bracket 510 to the first housing of the electronic device, the entire first swing arm 201 can form a linkage relationship with the first housing of the electronic device, and the independence of the hinge mechanism can be relatively higher, which facilitates the processing and assembly of the hinge mechanism.

[0063] Accordingly, in order to ensure that the first mating slider 301 can still be clamped between the first inclined surface 211a and the second inclined surface 221a of the first swing arm 201, the first rotating part 211 and the second rotating part 221 are spaced apart and fixedly arranged in the axial direction, and the first connecting part 212 and the second connecting part 222 are spaced apart and fixedly arranged. That is, the first arm body 210 and the second arm body 220 can actually be considered as two independent components. By fixing them relatively in the axial direction, it is ensured that they can be regarded as a whole and interact with the first mating slider 301 (and the second mating slider 302) and the second swing arm 202, thereby enabling the hinge mechanism to have the ability to rotate synchronously.

[0064] Furthermore, when the first swing arm 201 includes the aforementioned first arm body 210 and second arm body 220, the portion of the first swing arm 201 used to connect with the first bracket 510 is relatively large in the axial direction due to the mutual spacing between the first connecting portion 212 and the second connecting portion 222. This improves the overall stability of the fit between the first swing arm 201 and the first bracket 510. At the same time, since the first connecting portion 212 and the second connecting portion 222 are axially spaced apart, the first swing arm 201 can engage with the first bracket 510 through a double sliding fit structure. This further improves the fit accuracy between the first swing arm 201 and the first bracket 510 and enhances the smoothness of the movement between the first swing arm 201 and the first engaging slider 301.

[0065] Alternatively, a connecting beam or similar structure can be provided between the first connecting portion 212 and the second connecting portion 222 to enable the first arm 210 and the second arm 220 to form a relatively fixed relationship in the aforementioned axial direction. In another embodiment of this application, two axial limiting mechanisms can also be provided on the first bracket 510, and both axial limiting structures 501 have sliding grooves. The first connecting portion 212 and the second connecting portion 222 can respectively extend into the sliding grooves of the two axial limiting structures 501, so that the first connecting portion 212 and the second connecting portion 222 can slide and engage with the first bracket 510 in a direction perpendicular to the axial direction. At the same time, the two axial limiting structures 501 can also restrict the relative positional relationship between the first connecting portion 212 and the second connecting portion 222 and the first bracket 510 in the axial direction, preventing the first connecting portion 212 and the second connecting portion 222 from moving relative to the first bracket 510 in the axial direction.

[0066] By employing the above-described technical solution to limit the axial positional relationship between the first swing arm 201 and the first bracket 510, it is unnecessary to pre-fix the first arm 210 and the second arm 220, thereby further reducing the processing and assembly difficulty of the hinge mechanism. Furthermore, by increasing the dimension of the axial limiting structure 501 in the extension direction of the first connecting portion 212 to a certain extent, the limiting fit dimension between the axial limiting structure 501 and the first arm 210 (and the second arm 220) in the direction perpendicular to the axial direction can also be increased, thereby further enhancing the limiting effect of the axial limiting structure 501.

[0067] As described above, the above embodiments specifically introduced the structure and assembly relationship of the first swing arm 201. Similarly, the hinge mechanism may also include a second support 520 opposite to the first support 510, and the second swing arm 202 is designed accordingly with reference to the structure of the first swing arm 201 described in the above embodiments, so that the cooperation stability between the second swing arm 202 and the second support 520, as well as between the second swing arm 202 and the base 100, is relatively high, thereby improving the overall performance of the hinge mechanism.

[0068] As described above, a cam member 420 can be provided on the side of the first rocker arm 201 away from its first inclined surface 211a. Based on this, when both the first rocker arm 201 and the second rocker arm 202 have a first inclined surface 211a and a second inclined surface 221a, a cam surface and the aforementioned cam member 420 can also be provided on the side of the second rocker arm 202 away from its first inclined surface 211a. That is, the two cam members 420 are respectively located on the side of the two first inclined surfaces 211a away from the corresponding second inclined surface 221a.

[0069] Meanwhile, by fixing the two cams 420 that respectively cooperate with the first swing arm 201 and the second swing arm 202 relatively in the aforementioned axial direction, both cams 420 can elastically cooperate with the same elastic element 410. Thus, during the switching between the unfolded and folded states of the hinge mechanism, whether the first swing arm 201 or the second swing arm 202 is the active driving element, it can directly drive the corresponding cam 420 to move axially and compress the elastic element 410 while being driven to rotate relative to the base 100. This reduces the difficulty of driving the cam 420 and significantly reduces the probability of jamming in the cam 420, the elastic element 410, and the driven elements in the first swing arm 201 and the second swing arm 202, thereby improving the reliability and smoothness of the hinge mechanism.

[0070] With cams 420 on the side of the first swing arm 201 and the second swing arm 202 away from their first inclined plane 211a, in order to further improve the reliability of the hinge mechanism, each cam 420 can be provided with an elastic element 410 on the side away from the first mating slider 301. Thus, whether the first swing arm 201 or the second swing arm 202 is the active driving element, the cam 420 can drive the elastic element 410 distributed along the axial direction to be squeezed, so that the force is transmitted linearly, and further prevent jamming during the operation of the hinge mechanism.

[0071] Optionally, by forming the two cam components 420 located on the same side of the first rocker arm 201 and the second rocker arm 202 as a single piece, it can be ensured that the two cam components 420 have the ability to be relatively fixed in the axial direction, and the processing and assembly difficulty of the hinge mechanism can be reduced. Of course, after the two cam components 420 are formed separately, they can also be bonded or otherwise made to form a relatively fixed relationship in the axial direction.

[0072] As described above, during the use of the hinge mechanism, the first swing arm 201 and the second swing arm 202 can be directly or indirectly connected to the first housing and the second housing of the electronic device, respectively. Based on this, neither the first swing arm 201 nor the second swing arm 202 can move axially relative to the base 100. Thus, during the rotation of the first swing arm 201 and the second swing arm 202 relative to the base 100, the cam member 420 that cooperates with them will move axially relative to the base 100. That is, the cam member 420 has the ability to move axially relative to the base 100. Furthermore, in order to improve the stability of the cooperation between the cam member 420 and the base 100, a mounting structure such as a limiting groove can be provided on the base 100 for the cam member 420.

[0073] In another embodiment of this application, the hinge mechanism may further include a synchronous shaft 430, and both the first swing arm 201 and the second swing arm 202 may be equipped with a synchronous shaft 430, thereby enabling both the first swing arm 201 and the second swing arm 202 to form a relatively reliable rotational engagement relationship with the base 100 through the corresponding synchronous shaft 430. Furthermore, two cam members 420 located on the side of the first swing arm 201 and the second swing arm 202 opposite to their respective first inclined surfaces 211a may be respectively sleeved on the two synchronous shafts 430, thereby improving the reliability of the engagement between each cam member 420 and the synchronous shaft 430.

[0074] Meanwhile, with a synchronous shaft 430 provided, as described above, the elastic element 410 can specifically be a compression spring. Therefore, the elastic element 410 can be sleeved outside the synchronous shaft 430. Furthermore, with both the first swing arm 201 and the second swing arm 202 equipped with elastic elements 410, each synchronous shaft 430 can be sleeved with an elastic element 410 to ensure relatively high operational stability for each elastic element 410. Of course, in other embodiments of this application, based on parameters such as the specific dimensions of the gap between the synchronous shafts 430 that respectively cooperate with the first swing arm 201 and the second swing arm 202, an additional elastic element 410 can be provided between two adjacent synchronous shafts 430. By equipping the elastic element 410 with devices such as a mounting bracket 440, both the first swing arm 201 and the second swing arm 202 can form a good cooperative relationship with the elastic element 410.

[0075] More specifically, the mounting bracket 440 can be sleeved on the two synchronous shafts 430, and the mounting bracket 440 and the end of the synchronous shaft 430 away from the first swing arm 201 are relatively fixed. At the same time, by setting a positioning shaft or other structure on the side of the mounting bracket 440 facing the first swing arm 201, one end of the elastic member 410 additionally set between the two synchronous shafts 430 can be sleeved on the positioning shaft of the mounting bracket 440. As for the other end of the elastic member 410, another positioning shaft can be set on the connection part of the two cam members 420 located between the first swing arm 201 and the elastic member 410, and the other end of the elastic member 410 can be sleeved on the other positioning shaft, ensuring that the working stability of the elastic member 410 additionally set between the two synchronous shafts 430 is also relatively high.

[0076] As described above, a cam surface and a cam element 420 can be provided on the side of the first swing arm 201 and the second swing arm 202 opposite to their respective first inclined plane 211a, and the hinge mechanism is equipped with a hovering capability by using an elastic element 410. In order to improve the reliability of the hovering state of the hinge mechanism, in another embodiment of this application, the above-mentioned cam surface and cam element 420 can also be provided on the side of the first swing arm 201 and the second swing arm 202 opposite to their respective second inclined plane 221a. In this way, during the rotation of the first swing arm 201 and the second swing arm 202 relative to the base 100, the cam elements 420 located on their respective opposite sides can be driven to move away from each other. This can further increase the damping force of the hinge mechanism, thereby improving the stability of the hinge mechanism when it is in the hovering state.

[0077] In the above embodiment, the elastic element 410 is located on the side of the first rocker arm 201 away from its first inclined surface 211a. Based on this, in order to ensure that the cam surface provided on the side of the first rocker arm 201 away from its second inclined surface 221a can provide damping force when it cooperates with the corresponding cam element 420, in this embodiment, another or more elastic elements 410 can be further provided on the side of the first rocker arm 201 away from its second inclined surface 221a.

[0078] In another embodiment of this application, in order to reduce the size of the entire hinge mechanism in its own axial direction, one or more elastic members 410 are arranged side by side only on the side of the first swing arm 201 away from its first inclined surface 211a. At the same time, by making each synchronous shaft 430 move and cooperate with the base 100 in the axial direction, it is ensured that the cam member 420 located on the side of the first swing arm 201 away from its second inclined surface 221a can also cooperate with the cam surface of the first swing arm 201 and produce a damping effect.

[0079] More specifically, the embodiments of this application also include a retaining ring 460, and by providing a limiting groove on the synchronous shaft 430, the retaining ring 460 is held in the limiting groove, so that the retaining ring 460 can form an axial limiting relationship with the synchronous shaft 430. Furthermore, in the axial direction of the hinge mechanism, the retaining ring 460 can be used to make the cam member 420 located on the side of the first rocker arm 201 away from its second inclined surface 221a form a relatively fixed relationship with the synchronous shaft 430. Thus, when the first rocker arm 201 rotates relative to the base 100, it can drive the cam member 420 located on the side of its second inclined surface 221a away from itself to move away from the first rocker arm 201. And during the axial movement of the cam member 420, it can drive the synchronous shaft 430 fixed to it to move relative to the base 100 towards the first rocker arm 201, thereby causing the synchronous shaft 430 to compress the elastic member 410.

[0080] Meanwhile, during the rotation of the first swing arm 201 relative to the base 100, it can also drive the second swing arm 202 to rotate relative to the base 100 through the first and second mating sliders 301 and 302. During the rotation of the second swing arm 202, the cam 420 located on the side of the second swing arm 202 away from its first inclined surface 211a can also be driven by the second swing arm 202 and move axially away from the second swing arm 202. During the movement of the cam 420, the elastic element 410 can be further squeezed, so that the opposite ends of the elastic element 410 are brought closer to each other, increasing the elastic force of the elastic element 410, thereby improving the damping effect of the hinge mechanism, improving the suspension stability of the hinge mechanism, and making the axial dimension of the entire hinge mechanism relatively small.

[0081] In addition, in this embodiment, since each synchronous shaft 430 has the ability to move relative to the base 100 along the axial direction, a limiting sleeve distributed along the axial direction can be provided on the base 100, and each synchronous shaft 430 is inserted between at least two limiting sleeves to provide limiting and guiding functions for the synchronous shaft 430, thereby improving the fit stability between the synchronous shaft 430 and the base 100.

[0082] In another embodiment of this application, two positioning holes may be provided only at one end or one end face of the base 100 along the axial direction, and the two synchronous shafts 430 may be inserted into the two positioning holes respectively. Simultaneously, the hinge mechanism may also include a fixed bracket 450, which may be fixedly mounted on the base 100 by screws or other detachable connectors, and the fixed bracket 450 and the positioning holes are spaced apart axially. By having each synchronous shaft 430 pass through the fixed bracket 450, the stability of the fit between each synchronous shaft 430 and the base 100 is relatively high. In the case of this embodiment, the base 100 is formed in a one-piece molding manner, thereby preventing the base 100 from failing to demold properly due to the need for the aforementioned limiting sleeves on the base 100.

[0083] In the base 100 disclosed in this application embodiment, it includes a bushing 110 and a support plate 120. As described above, the hinge mechanism may include a first rotating arm 611 and a second rotating arm 612, and both the first rotating arm 611 and the second rotating arm 612 are rotatably connected to the base 100. More specifically, in this application embodiment, the bushing 110 is a component in the base 100 specifically used to form a rotational engagement relationship with the first rotating arm 611 and the second rotating arm 612. For this purpose, the bushing 110 may be provided with two oppositely distributed rotational engagement grooves 111. The first rotating arm 611 and the second rotating arm 612 are respectively disposed on opposite sides of the bushing 110 and are rotatably engaged with the two rotational engagement grooves 111.

[0084] Furthermore, the bushing 110 is connected to one side of the support plate 120, and the rotational grooves 111 on the bushing 110 all face the support plate 120. This allows the first rotating arm 611, the second rotating arm 612, the first arm 201, and the second arm 202 in the hinge mechanism to rotate towards the side facing the support plate 120. This enables the hinge mechanism to be applied to inward-folding electronic devices, which provide better protection for the flexible screen 900 and extend its lifespan. In other words, the support plate 120 in the base 100 is located on the side of the hinge mechanism facing the flexible screen 900 of the electronic device. This allows the support plate 120 to provide support for the flexible screen 900, thereby improving the stability of the fit between the flexible screen 900 and the hinge mechanism. It also prevents the portion of the flexible screen 900 corresponding to the base 100 of the hinge mechanism from being dented due to pressure when touched by a stylus or the user's finger, thus improving the display effect and lifespan of the flexible screen 900.

[0085] As described above, the base 100 disclosed in this application embodiment can be formed by integral molding. Based on this, to ensure that the presence of other structures including the base 100, especially the rotating engagement groove 111 on the bushing 110, does not affect the demolding process of the base 100, in the hinge mechanism disclosed in this application embodiment, each rotating engagement groove 111 has a demolding notch 111a between the side of each rotating engagement groove 111 away from the other rotating engagement groove 111 and the support plate 120. Furthermore, in the axial direction, both opposite ends of each demolding notch 111a extend to the end of the corresponding rotating engagement groove 111. In other words, in the direction perpendicular to the axial direction, the outer side of each rotating engagement groove 111 is an open structure, that is, the outer side of each rotating engagement groove 111 communicates with the space outside the base 100. Therefore, during the integral molding of the base 100 with the above structure, the mold used to form the rotating engagement groove 111 can separate from the molded base 100 from the outer edge of the rotating engagement groove 111, ensuring that the base 100 has the conditions for integral molding.

[0086] In addition, in order to reduce the overall weight of the base 100, a weight-reducing notch 111b can be provided in the middle of the part of the bushing 110 that forms the rotational mating groove 111 opposite to the support plate 120. This way, while ensuring that the first rotating arm 611 and the second rotating arm 612 have a rotational mating relationship with the corresponding rotational mating groove 111, the weight of the entire base 100 can be further reduced, which is conducive to the development of electronic devices using this hinge mechanism towards thinner and lighter designs.

[0087] In the hinge mechanism disclosed in the embodiments of this application, it may include only one swing arm and one second swing arm 202, and correspondingly, it may also include a first mating slider 301 and a second mating slider 302, etc. In another embodiment of this application, a base 100, a first swing arm 201, a second swing arm 202, a first mating slider 301, and a second mating slider 302, etc., can constitute a hinge assembly, and the hinge mechanism includes multiple hinge assemblies spaced apart along their own axial direction. Under the action of multiple hinge assemblies, the connection reliability and folding smoothness between the hinge mechanism and the first and second housings of the electronic device can be improved, and the torsional deformation of the flexible screen 900 during folding and unfolding can also be prevented. More specifically, when multiple hinge assemblies are spaced apart along the axial direction, any two adjacent hinge assemblies can be connected to each other by a connector.

[0088] In another embodiment of this application, a middle plate 800 may be provided between any two adjacent hinge components. Similar to the support plate 120 of the base 100 mentioned in the above embodiment, the middle plate 800 can also provide support for the flexible screen 900, thereby further improving the support effect of the flexible screen 900. Simultaneously, the middle plate 800 is connected to the hinge components on its adjacent sides by welding to further improve the reliability and stability of the connection between multiple hinge components. It should be noted that the spacing between any two adjacent hinge components can be the same or different, and this is not limited herein.

[0089] Based on the hinge mechanism disclosed in any of the above embodiments of this application, this application also discloses an electronic device that includes any of the aforementioned hinge mechanisms. Of course, the electronic device may also include a flexible screen 900, a first housing and a second housing, and a battery, etc., wherein the first housing and the second housing are connected by a hinge mechanism and together provide support for the flexible screen 900, and the battery is used to power the electrical components in the electronic device. In addition, the electronic device may also include other electronic components such as a camera module; for the sake of brevity, they will not be described in detail here.

[0090] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A hinge mechanism, characterized in that, It includes a base (100), a first swing arm (201), a second swing arm (202), a first mating slider (301), and a second mating slider (302). The first swing arm (201) and the second swing arm (202) are rotatably connected to opposite sides of the base (100), and the first mating slider (301) and the second mating slider (302) are slidably connected to the base (100). The first swing arm (201) has a first inclined surface (211a), the second swing arm (202) has a second inclined surface (221a), the first mating slider (301) has a third inclined surface (310), and the second mating slider (302) has a fourth inclined surface (320); the first inclined surface (211a), the second inclined surface (221a), the third inclined surface (310), and the fourth inclined surface (320) are all surfaces inclined relative to the axial direction of the hinge mechanism. The first inclined surface (211a) is opposite to and mats with the third inclined surface (310), and the second inclined surface (221a) is also inclined with the third inclined surface (310). 1a) The fourth inclined surface (320) is opposite to and cooperates with the fourth inclined surface. When one of the two cooperating surfaces rotates relative to the base (100), the rotational motion of one can be converted into the axial motion of the other by utilizing the mutual contact and cooperation relationship between the inclined surfaces. By setting the third inclined surface (310) and the fourth inclined surface (320) opposite to each other along the axial direction of the hinge mechanism, the force along the axial direction of the hinge mechanism can be transmitted sequentially between the first swing arm (201), the first cooperating slider (301), the second cooperating slider (302) and the second swing arm (202). When the first swing arm rotates relative to the base, the first inclined surface pushes the third inclined surface to drive the first and second mating sliders to move along the axial direction of the hinge mechanism toward the first end of the base, and the fourth inclined surface pushes the second inclined surface to drive the second swing arm to rotate relative to the base. When the second swing arm rotates relative to the base, the second inclined surface pushes the fourth inclined surface to drive the first and second mating sliders to move along the axial direction of the hinge mechanism toward the second end of the base away from its first end, and the third inclined surface pushes the first inclined surface to drive the first swing arm to rotate relative to the base.

2. The hinge mechanism according to claim 1, characterized in that, The hinge mechanism further includes an elastic element (410) and a cam element (420). The end of the first swing arm (201) facing away from the first inclined surface (211a) and the cam element (420) are both provided with cam surfaces. The end of the first swing arm (201) facing away from the first inclined surface (211a) is engaged with the cam of the cam element (420). In the axial direction, one end of the elastic element (410) is connected to the side of the cam element (420) facing away from its cam surface, and the other end of the elastic element (410) is fixed relative to the base (100).

3. The hinge mechanism according to claim 2, characterized in that, The first swing arm (201) also has a second inclined surface (221a), the second swing arm (202) also has a first inclined surface (211a), the first mating slider (301) also has a fourth inclined surface (320), and the second mating slider (302) also has a third inclined surface (310). In the axial direction, the first mating slider (301) is sandwiched between the first inclined surface (211a) and the second inclined surface (221a) of the first swing arm (201), and the second mating slider (302) is sandwiched between the first inclined surface (211a) and the second inclined surface (221a) of the second swing arm (202).

4. The hinge mechanism according to claim 3, characterized in that, The hinge mechanism includes a first bracket (510), and the first swing arm (201) includes a first arm body (210) and a second arm body (220). The first arm body (210) includes a first rotating part (211) and a first connecting part (212) fixedly connected. The second arm body (220) includes a second rotating part (221) and a second connecting part (222) fixedly connected. The first rotating part (211) has a first inclined surface (211a), and the second rotating part (221) has a second inclined surface (221a). The first rotating part (211) and the second rotating part (221) are both rotatably connected to the base (100). The first connecting part (212) and the second connecting part (222) are both slidably engaged with the first bracket (510) in a direction perpendicular to the axial direction. In the axial direction, the first rotating part (211) and the second rotating part (221) are spaced apart, and the first connecting part (212) and the second connecting part (222) are spaced apart.

5. The hinge mechanism according to claim 3, characterized in that, The second swing arm (202) has the cam surface and the cam element (420) on the side opposite to its first inclined surface (211a), and the two cam elements (420) that cooperate with the first swing arm (201) and the second swing arm (202) are fixed relative to each other in the axial direction.

6. The hinge mechanism according to claim 5, characterized in that, The first swing arm (201) and the second swing arm (202) are rotatably mounted on the base (100) via a synchronous shaft (430), and each synchronous shaft (430) is fitted with an elastic element (410). One end of each elastic element (410) is fixed relative to the synchronous shaft (430), and the other end of each elastic element (410) abuts against the two cam elements (420).

7. The hinge mechanism according to claim 6, characterized in that, Each of the synchronous shafts (430) is movably engaged with the base (100) in the axial direction. The first swing arm (201) and the second swing arm (202) are each provided with the cam surface and the cam element (420) on the side away from the second inclined surface (221a). In the axial direction, the two cam elements (420) located on the side of the first swing arm (201) away from the elastic element (410) are fixed relative to each other, and both are fixed relative to the synchronous shaft (430).

8. The hinge mechanism according to claim 1, characterized in that, When the hinge mechanism is in either the unfolded or folded state, the fourth inclined surface (320) is in contact with the second inclined surface (221a); When the hinge mechanism is in either the unfolded or folded state, the third inclined surface (310) is in contact with the first inclined surface (211a).

9. The hinge mechanism according to claim 1, characterized in that, The hinge mechanism includes a first rotating arm (611) and a second rotating arm (612). The base (100) includes a bushing (110) and a support plate (120). The bushing (110) is connected to one side of the support plate (120), and the bushing (110) is provided with two oppositely distributed rotating engagement grooves (111). Each of the rotating engagement grooves (111) faces the support plate (120). The first rotating arm (611) and the second rotating arm are respectively disposed on opposite sides of the bushing (110) and are respectively rotatingly engaged with the two rotating engagement grooves (111). Each of the rotating mating grooves (111) has a demolding notch (111a) between the side away from the other rotating mating groove (111) and the support plate (120), and in the axial direction, the opposite ends of each demolding notch (111a) extend to the end of the corresponding rotating mating groove (111).

10. An electronic device, characterized in that, Includes the hinge mechanism as described in any one of claims 1-9.

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