Hinge and electronic equipment

Abstract

The embodiment of the invention provides a hinge and electronic equipment, and relates to the field of electronic equipment. The hinge comprises a hinge body and two folding assemblies, and the two folding assemblies are rotationally connected with the two opposite sides of the hinge body correspondingly. Each folding assembly comprises a first swing arm, a connecting piece and a first gear, one end of the first swing arm is rotationally connected with the hinge body, and the first gear is located on the side, away from the other folding assembly, of the connecting piece. The first swing arm is provided with a first rack, the connecting piece is provided with a second rack, the first gear is located between the first rack and the second rack and engaged with the first rack and the second rack, and when the first swing arm rotates relative to the hinge body, the first gear rotates relative to the first rack and the second rack. When the first swing arm rotates relative to the hinge body, the connecting piece can slide relative to the first swing arm, the stability of relative movement between the first swing arm and the connecting piece is improved, and the rotating angle when the hinge is unfolded and closed can be accurately controlled.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic devices, and particularly to a hinge and an electronic device. Background Art

[0002] With the continuous development of display technology, folding screens are increasingly used in various electronic devices. At present, water-drop-shaped folding screens have been widely used in foldable electronic devices. The hinge of the water-drop-shaped folding screen can reduce the depth of the crease on the screen and improve the display effect of the screen.

[0003] In the related art, the hinge of the folding screen includes a swing arm. When the swing arm rotates relative to the virtual axis, there is relative sliding between the swing arm and the middle frame of the electronic device. When the folding screen is closed, the virtual axis structure of the swing arm is complex and the fitting accuracy is low, which affects the stability of the movement of the swing arm and the middle frame. Summary of the Invention

[0004] In view of this, the present disclosure provides a hinge and an electronic device, which can make the cooperation between the swing arm and the middle frame more stable.

[0005] Specifically, the technical solutions include the following:

[0006] An embodiment of the present disclosure provides a hinge, including a hinge body and two folding components, and the two folding components are respectively rotatably connected to opposite sides of the hinge body;

[0007] The folding component includes a first swing arm, a connecting piece and a first gear. One end of the first swing arm is rotatably connected to the hinge body. When the hinge is in the closed state, the first gear is located on the side of the connecting piece away from the other folding component;

[0008] A first rack is provided on one surface of the first swing arm, a second rack is provided on the connecting piece, the extending directions of the first rack and the second rack are perpendicular to the rotation axis of the first swing arm, the first rack and the second rack are opposite to each other, the first gear is located between the first rack and the second rack, and is respectively engaged with the first rack and the second rack. When the first swing arm rotates relative to the hinge body, the first gear rotates relative to the first rack and the second rack.

[0009] Optionally, the first gear is a variable-diameter gear, the side with a smaller radius of the first gear is engaged with the first rack, and the side with a larger radius of the first gear is engaged with the second rack.

[0010] Optionally, the connecting piece is provided with a first sliding groove, the first swing arm is provided with a first sliding rail, and the first sliding rail is slidably matched with the first sliding groove.

[0011] Optionally, the folding assembly further includes a slider and a second swing arm. Opposite ends of the second swing arm are respectively rotatably connected to the hinge body and the slider, and the slider is slidably connected to the connecting member.

[0012] Optionally, the slider is located between the first rack and the second rack. The slider is provided with a gear shaft, and the first gear is rotatably connected to the gear shaft.

[0013] Optionally, the connecting member is provided with a second chute, and the slider is provided with a second sliding rail, and the second sliding rail is slidably engaged with the second chute.

[0014] Optionally, one end of the first swing arm close to the hinge body is provided with a first rotating shaft. The first swing arm is rotatably connected to the hinge body through the first rotating shaft. One end of the second swing arm close to the hinge body is provided with a second rotating shaft. The second swing arm is rotatably connected to the hinge body through the second rotating shaft, and the axes of the first rotating shaft and the second rotating shaft are parallel to each other.

[0015] Optionally, a receiving groove is provided on a first surface of the connecting member, and at least a part of the first swing arm and the slider is located in the receiving groove.

[0016] Optionally, the folding assembly further includes a floating plate. The floating plate is located on a side of the connecting member away from the first swing arm, and the floating plate is movably connected to the connecting member.

[0017] Optionally, a third sliding rail is provided on a side of the floating plate close to the connecting member, and the connecting member is provided with a third chute, and the third sliding rail is slidably engaged with the third chute.

[0018] Optionally, the hinge body is provided with a limiting groove. One end of the first swing arms of the two folding assemblies is located in the limiting groove, and the first swing arms of the two folding assemblies are drivingly connected.

[0019] Optionally, the hinge body includes at least two second gears. The two second gears are meshed with each other and are located in the limiting groove. An external tooth structure is provided at one end of the first swing arm, and the external tooth structures of the first swing arms of the two folding assemblies are respectively meshed with the two second gears.

[0020] The embodiment of the present disclosure further provides an electronic device, including a flexible screen module and any one of the above hinges.

[0021] Optionally, the electronic device further includes at least two middle frames, wherein two of the middle frames are respectively connected to the two folding assemblies, and the flexible screen module is connected to the middle frames and the hinge body.

[0022] The beneficial effects of the technical solutions provided by the embodiments of the present disclosure at least include:

[0023] In the hinge provided by the embodiments of the present disclosure, a first rack is provided on the first swing arm, a second rack is provided on the connecting member, both the first rack and the second rack are engaged with the first gear, and the connecting member is used to be connected to the middle frame of the electronic device. When the first swing arm rotates relative to the hinge body, the first rack is transmitted to the connecting member through the first gear and the second rack, so that the connecting member can slide relative to the first swing arm, increasing the stability of the relative movement between the first swing arm and the connecting member, which is beneficial to accurately control the rotation angle when the hinge is unfolded and closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the hinge provided by the embodiments of the present disclosure;

[0026] Figure 2 It is an exploded view of the hinge provided by the embodiments of the present disclosure;

[0027] Figure 3 It is a schematic diagram of the hinge provided by the embodiments of the present disclosure in a flattened state;

[0028] Figure 4 It is a schematic diagram of the hinge provided by the embodiments of the present disclosure in a closed state;

[0029] Figure 5 It is a partial cross-sectional view of the hinge provided by the embodiments of the present disclosure and the flexible screen module;

[0030] Figure 6 It is a schematic diagram of the electronic device provided by the embodiments of the present disclosure.

[0031] 1 - hinge body; 2 - folding assembly; 100 - middle frame; 200 - flexible screen module; 300 - hinge;

[0032] 12 - limiting groove; 11 - second gear; 21 - first swing arm; 22 - connecting member; 23 - first gear; 24 - slider; 25 - second swing arm; 26 - floating plate;

[0033] 211 - First rack; 212 - First slide rail; 213 - External tooth structure; 214 - First rotating shaft; 221 - Second rack; 222 - First chute; 223 - Second chute; 224 - Accommodating groove; 225 - Third chute; 226 - Limiting portion; 241 - Gear shaft; 242 - Second slide rail; 251 - Second rotating shaft; 261 - Third slide rail.

[0034] Through the above - mentioned drawings, specific embodiments of the present disclosure have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0036] Figure 1 It is a schematic structural diagram of a hinge provided for an embodiment of the present disclosure. As Figure 1 shown, the hinge includes a hinge body 1 and two folding components 2. The two folding components 2 are respectively rotatably connected to opposite sides of the hinge body 1. The folding component 2 includes a first swing arm 21, a connecting member 22, and a first gear 23. One end of the first swing arm 21 is rotatably connected to the hinge body 1. When the hinge is in a closed state, the first gear 23 is located on the side of the connecting member 22 away from the other folding component 2. A first rack 211 is provided on one surface of the first swing arm 21, a second rack 221 is provided on the connecting member 22. The extending directions of the first rack 211 and the second rack 221 are perpendicular to the rotation axis of the first swing arm 21. The first rack 211 faces the second rack 221. The first gear 23 is located between the first rack 211 and the second rack 221 and meshes with the first rack 211 and the second rack 221 respectively. When the first swing arm 21 rotates relative to the hinge body 1, the first gear 23 rotates relative to the first rack 211 and the second rack 221.

[0037] In the hinge provided by the embodiment of the present disclosure, a first rack 211 is arranged on the first swing arm 21, a second rack 221 is arranged on the connecting member 22, the first rack 211 and the second rack 221 are respectively engaged with the first gear 23, and the connecting member 22 is used to be connected to the middle frame of the electronic device. When the first swing arm 21 rotates relative to the hinge body 1, the first rack 211 is transmitted to the connecting member 22 through the first gear 23 and the second rack 221, so that the connecting member 22 can slide relative to the first swing arm 21, increasing the stability of the relative movement between the first swing arm 21 and the connecting member 22, which is beneficial to accurately control the rotation angle when the hinge is unfolded and closed.

[0038] To make the technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0039] As Figure 1 shown, the hinge provided by the embodiment of the present disclosure includes a hinge body 1 and two folding assemblies 2. The two folding assemblies 2 are respectively rotatably connected to the opposite sides of the hinge body 1. The two folding assemblies 2 are used to be connected to the flexible screen of the electronic device and can move relative to the hinge body 1 to a flattened state or a closed state, so as to flatten or retract the flexible screen.

[0040] Among them, the folding component 2 includes a first swing arm 21, a connecting piece 22 and a first gear 23. One end of the first swing arm 21 is rotatably connected to the hinge body 1. The connecting piece 22 is in transmission connection with the first swing arm 21, and the connecting piece 22 is used to be connected to the middle frame of the electronic device. A first rack 211 is arranged on one side of the first swing arm 21, and a second rack 221 is arranged on the side of the connecting piece 22 away from the screen of the electronic device. The first gear 23 is located on the side of the connecting piece 22 away from the screen of the electronic device. The first rack 211 faces the second rack 221, and the first gear is located between the first rack 211 and the second rack 221 and meshes with the first rack 211 and the second rack 221 respectively. When the first swing arm 21 rotates relative to the hinge body 1, the first gear 23 rotates relative to the first rack 211 and the second rack 221. When the hinge moves from the flattened state to the closed state, the first swing arm 21 rotates relative to the hinge body 1, and the first rack 211 of the first swing arm 21 is transmitted to the connecting piece 22 through the first gear 23 and the second rack 221, so that the connecting piece 22 slides in a direction away from the first swing arm 21; when the hinge moves from the flattened state to the closed state, the first swing arm 21 rotates relative to the hinge body 1, and the first rack 211 of the first swing arm 21 is transmitted to the connecting piece 22 through the first gear 23 and the second rack 221, so that the connecting piece 22 slides in a direction close to the first swing arm 21, thereby adjusting the relative position between the middle frame connected to the connecting piece 22 and the hinge body 1. The transmission structure between the first swing arm 21 and the connecting block 22 increases the stability of the relative movement between the first swing arm 21 and the connecting piece 22, which is beneficial to accurately control the rotation angle when the hinge is unfolded and closed.

[0041] Figure 2 is an exploded view of the hinge provided by the embodiment of the present disclosure. In some embodiments of the present disclosure, as Figure 2 shown, the connecting piece 22 is provided with a first sliding groove 222, and the first swing arm 21 is provided with a first sliding rail 212, and the first sliding rail 212 is slidably matched with the first sliding groove 222. Specifically, the extending directions of the first sliding groove 222 and the first sliding rail 212 are parallel to the extending direction of the first rack 211. The first rack 211 and the first sliding rail 212 are respectively located on opposite sides of the first swing arm 21. The first sliding groove 222 and the second rack 221 are spaced apart and opposite, and a part of the first swing arm 21 is located between the first sliding groove 222 and the second rack 221. The structure in which the first sliding rail 212 is slidably matched with the first sliding groove 222 can increase the stability of the sliding of the connecting piece 22 relative to the first swing arm 21.

[0042] In some embodiments of the present disclosure, as Figure 2As shown, the folding assembly 2 further includes a slider 24 and a second swing arm 25. The opposite ends of the second swing arm 25 are respectively rotatably connected to the hinge body 1 and the slider 24, and the slider 24 is slidably connected to the connecting member 22. The slider 24 can cooperate with the connecting member 22 and slide relative to the connecting member 22 to limit the connecting member 22 when the connecting member 22 slides, so that the hinge can rotate smoothly.

[0043] Optionally, referring to Figure 2 , the slider 24 is located between the first rack 211 and the second rack 221. The slider 24 is provided with a gear shaft 241, and the first gear 23 is rotatably connected to the gear shaft 241. When the first gear 23 rotates between the first rack 211 and the second rack 221, the gear shaft 241 can drive the first gear 23 to translate, thereby improving the moving accuracy of the gear 23. When the slider 24 slides to the limit position, the slider 24 can limit the movement of the first gear 23 to prevent the first gear 23 from rotating too many angles and disengaging from the first rack 211 or the second rack 221.

[0044] In some embodiments of the present disclosure, referring to Figure 2 , a receiving groove 224 is provided on the first surface of the connecting member 22, and at least a part of the first swing arm 21 and the slider 24 is located in the receiving groove 224.

[0045] In some embodiments of the present disclosure, as Figure 2 shown, the connecting member 22 is provided with a second chute 223, and the slider 24 is provided with a second sliding rail 242, and the second sliding rail 242 is slidably engaged with the second chute 223.

[0046] Wherein, a limiting portion 226 is provided in the receiving groove 224. A part of the first swing arm 21 is located between the limiting portion 226 and the inner wall of one side of the receiving groove 224, and the slider 24 is located between the limiting portion 226 and the inner wall of the other side of the receiving groove 224. The second chute 223 can be provided on the limiting portion 226 and the inner wall of the other side of the receiving groove 224, and the second chute 223 is located between the second rack 221 and the bottom of the receiving groove 224. Correspondingly, the second sliding rails 242 can be provided on the opposite sides of the slider 24. The structure in which the second sliding rail 242 is slidably engaged with the second chute 223 can increase the stability of the sliding fit between the slider 24 and the connecting member 22 and prevent the slider 24 from separating from the connecting member 22.

[0047] In some embodiments of the present disclosure, referring to Figure 2, a first rotating shaft 214 is provided at one end of the first swing arm 21 close to the hinge body 1, and the first swing arm 21 is rotatably connected to the hinge body 1 through the first rotating shaft 214, and a second rotating shaft 251 is provided at one end of the second swing arm 25 close to the hinge body 1, and the second swing arm 25 is rotatably connected to the hinge body 1 through the second rotating shaft 251, and the axis of the first rotating shaft 214 and the axis of the second rotating shaft 251 are parallel to each other. Among them, the axis of the first rotating shaft 214 and the axis of the second rotating shaft 251 do not coincide, and the first swing arm 21 and the second swing arm 25 have different rotation radii during the rotation process, so that when the first swing arm 21 rotates relative to the hinge body 1, the second swing arm 25 can simultaneously rotate relative to the hinge body 1 and drive the slider 24 to move at the same time.

[0048] In some embodiments of the present disclosure, Figure 2 As shown, the folding assembly 2 further includes a floating plate 26, which is located on a side of the connecting member 22 away from the first swing arm 21, and the floating plate 26 is movably connected to the connecting member 22. The floating plate 26 is used to connect to the flexible screen of the electronic device and provide support for the flexible screen when the hinge is in a flattened state to prevent the flexible plane from being dented in the area overlapping with the hinge.

[0049] In some embodiments of the present disclosure, Figure 2 As shown, the hinge body 1 is provided with a limiting groove 12, one end of the first swing arms 21 of the two folding components 2 is located in the limiting groove 12, and the first swing arms 21 of the two folding components 2 are transmission-connected. When one of the folding components 2 rotates relative to the hinge body 1, the other folding component 2 can rotate synchronously, so that the flexible screen can be completely flattened.

[0050] Figure 3 A schematic diagram of a hinge provided in an embodiment of the present disclosure when it is in a flattened state. In some embodiments of the present disclosure, such as Figure 3 As shown, a third slide rail 261 is provided on one side of the floating plate 26 close to the connecting member 22 , and a third slide groove 225 is provided on the connecting member 22 . The third slide rail 261 is slidably matched with the third slide groove 225 .

[0051] Among them, see Figure 2 , the third slide rails 261 are located at two ends of the floating plate 26 on one side close to the connecting member 22, and the third slide grooves 225 are located at two opposite ends of the connecting member 22. Specifically, as Figure 3As shown, the third slide rail 261 is arc-shaped, and the shape of the third chute 225 is adapted to the third slide rail 261. When the hinge switches from the closed state to the flattened state, the end of the floating plate 26 close to the hinge body 1 moves upward, thereby providing support for the flexible screen. When the hinge switches from the flattened state to the closed state, the end of the floating plate 26 close to the hinge body 1 moves downward, thereby increasing the distance between the ends of the two floating plates 26 close to the hinge body 1, thereby providing a larger space for accommodating the flexible screen.

[0052] Figure 4 This is a schematic diagram of the hinge provided by the embodiment of the present disclosure in the closed state. In some embodiments of the present disclosure, as Figure 4 shown, the first gear 23 is a variable-diameter gear. The side with a smaller radius of the first gear 23 meshes with the first rack 211, and the side with a larger radius of the first gear 23 meshes with the second rack 221. Specifically, the central angle corresponding to the side with a smaller radius of the first gear 23 is greater than the central angle corresponding to the side with a larger radius of the first gear 23, that is, the pitch arc length of the side with a smaller radius of the first gear 23 is equal to the pitch arc length of the side with a larger radius of the first gear 23.

[0053] During the rotation of the first gear 23, the linear velocity at the meshing position of the first gear 23 and the first rack 211 is less than the linear velocity at the meshing position of the first gear 23 and the second rack 221, that is, the connecting member 22 can slide relative to the first swing arm 21 at a faster speed, which can meet the longer stroke required by the connecting member 22, so as to facilitate the use of a smaller-sized first swing arm, thereby contributing to reducing the size of the hinge.

[0054] Figure 5 This is a partial cross-sectional view of the hinge and the flexible screen module provided by the embodiment of the present disclosure. In some embodiments of the present disclosure, as Figure 5 shown, the hinge body 1 includes at least two second gears 11. The two second gears 11 mesh with each other and are located in the limiting groove 12. An external tooth structure 213 is provided at one end of the first swing arm 21, and the external tooth structures 213 of the first swing arms 21 of the two folding assemblies 2 mesh with the two second gears 11 respectively.

[0055] Exemplarily, when one first swing arm 21 rotates counterclockwise to flatten the hinge, the two second gears 11 can drive the other first swing arm 21, so that the other first swing arm 21 rotates clockwise, thereby driving the two folding assemblies 2 to rotate synchronously.

[0056] The embodiment of the present disclosure also provides an electronic device, Figure 6 This is a schematic diagram of the electronic device provided by the embodiment of the present disclosure. The electronic device includes a flexible screen module 200 and any one of the hinges 300 in the above embodiments.

[0057] In the electronic device provided by the embodiments of the present disclosure, the hinge 300 includes a hinge body 1 and two folding components 2. The folding component 2 includes a connecting member 22 and a first swing arm 21. A first rack 211 is provided on the first swing arm 21, and a second rack 221 is provided on the connecting member 22. The first rack 211 and the second rack 221 are respectively engaged with a first gear 23. The connecting member 22 is used to be connected to the middle frame of the electronic device. When the first swing arm 21 rotates relative to the hinge body 1, the first rack 211 is transmitted to the connecting member 22 through the first gear 23 and the second rack 221, so that the connecting member 22 can slide relative to the first swing arm 21, increasing the stability of the relative movement between the first swing arm 21 and the connecting member 22, which is beneficial to accurately control the rotation angle when the hinge 300 is unfolded and closed.

[0058] The electronic device provided by the embodiments of the present disclosure may be, but is not limited to: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III), an MP4 (Moving Picture Experts Group Audio Layer IV) player, a laptop computer. The electronic device may also be referred to by other names such as user equipment, portable terminal, laptop terminal, etc. In the embodiments of the present disclosure, the electronic device may be a foldable electronic device or an accessory of the electronic device. For example, the foldable electronic device may be a foldable screen mobile phone or a tablet computer, etc.; the accessory of the electronic device may be an accessory with a foldable display screen. It should be noted that the embodiments of the present disclosure do not specifically limit the specific type of the electronic device.

[0059] Optionally, as Figure 6 shown, the electronic device further includes at least two middle frames 100. The two middle frames 100 are respectively connected to the two folding components 2. The flexible screen module 200 is connected to the middle frame 100 and the hinge body 1. The flexible screen module 200 has a bendable area and a non-bendable area. The bendable area is connected to the hinge body 1, and the non-bendable area is connected to the middle frame 100. Exemplarily, the flexible screen module 200 is connected to the middle frame 100 and the hinge body 1 by means of screw connection, welding or bonding.

[0060] It should be noted that, as mentioned in this article, "a plurality of" and "at least one" refer to one or more, and "a plurality of" and "at least two" refer to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0061] In the description of the present disclosure, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0062] In the present disclosure, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0063] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure.

[0064] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present disclosure.

[0065] The above are only the embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A hinge, characterized in that, It includes a hinge body (1) and two folding components (2), and the two folding components (2) are respectively rotatably connected to opposite sides of the hinge body (1); The folding component (2) includes a first swing arm (21), a connecting piece (22) and a first gear (23). One end of the first swing arm (21) is rotatably connected to the hinge body (1). When the hinge is in a closed state, the first gear (23) is located on the side of the connecting piece (22) away from the other folding component (2); A first rack (211) is arranged on one surface of the first swing arm (21), a second rack (221) is arranged on the connecting piece (22), the extending directions of the first rack (211) and the second rack (221) are perpendicular to the rotation axis of the first swing arm (21), the first rack (211) faces the second rack (221), the first gear (23) is located between the first rack (211) and the second rack (221) and meshes with the first rack (211) and the second rack (221) respectively. When the first swing arm (21) rotates relative to the hinge body (1), the first gear (23) rotates relative to the first rack (211) and the second rack (221).

2. The hinge according to claim 1, wherein The first gear (23) is a variable-diameter gear. The side with a smaller radius of the first gear (23) meshes with the first rack (211), and the side with a larger radius of the first gear (23) meshes with the second rack (221).

3. The hinge according to claim 1, characterized in that, The connecting piece (22) is provided with a first chute (222), and the first swing arm (21) is provided with a first slide rail (212). The first slide rail (212) is slidably matched with the first chute (222).

4. The hinge according to claim 1, wherein The folding component (2) further includes a slider (24) and a second swing arm (25). Opposite ends of the second swing arm (25) are respectively rotatably connected to the hinge body (1) and the slider (24), and the slider (24) is slidably connected to the connecting piece (22).

5. The hinge according to claim 4, characterized in that, The slider (24) is located between the first rack (211) and the second rack (221). The slider (24) is provided with a gear shaft (241), and the first gear (23) is rotatably connected to the gear shaft (241).

6. The hinge according to claim 4, characterized in that, The connecting piece (22) is provided with a second chute (223), and the slider (24) is provided with a second slide rail (242). The second slide rail (242) is slidably matched with the second chute (223).

7. The hinge according to claim 4, wherein One end of the first swing arm (21) close to the hinge body (1) is provided with a first rotating shaft (214). The first swing arm (21) is rotationally connected to the hinge body (1) through the first rotating shaft (214). One end of the second swing arm (25) close to the hinge body (1) is provided with a second rotating shaft (251). The second swing arm (25) is rotationally connected to the hinge body (1) through the second rotating shaft (251), and the axis of the first rotating shaft (214) is parallel to the axis of the second rotating shaft (251).

8. The hinge according to claim 4, characterized in that, A receiving groove (224) is provided on the first surface of the connecting member (22). At least a part of the first swing arm (21) and the slider (24) is located in the receiving groove (224).

9. The hinge according to claim 8, characterized in that, The folding assembly (2) further includes a floating plate (26). The floating plate (26) is located on a side of the connecting member (22) away from the first swing arm (21), and the floating plate (26) is movably connected to the connecting member (22).

10. The hinge according to claim 9, characterized in that, A third sliding rail (261) is provided on a side of the floating plate (26) close to the connecting member (22). The connecting member (22) is provided with a third sliding groove (225). The third sliding rail (261) is in sliding fit with the third sliding groove (225).

11. The hinge according to claim 1, characterized in that, The hinge body (1) is provided with a limiting groove (12). One end of the first swing arms (21) of the two folding assemblies (2) is located in the limiting groove (12), and the first swing arms (21) of the two folding assemblies (2) are in transmission connection.

12. The hinge according to claim 11, wherein, The hinge body (1) includes at least two second gears (11). The two second gears (11) are meshed with each other and are located in the limiting groove (12). An external tooth structure (213) is provided at one end of the first swing arm (21). The external tooth structures (213) of the first swing arms (21) of the two folding assemblies (2) are respectively meshed with the two second gears (11).

13. An electronic device, characterized in that, It includes a flexible screen module and the hinge according to any one of claims 1 to 12.

14. The electronic device according to claim 13, characterized in that, It further includes at least two middle frames. The two middle frames are respectively connected to the two folding assemblies. The flexible screen module is connected to the middle frames and the hinge body.

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