Rotating shaft mechanism and display terminal

Abstract

A rotating shaft mechanism and a display terminal. In the rotating shaft mechanism (20), a first rotating arm (201) is rotatably connected to a main shaft (200) around a first direction (Y), and a second rotating arm (202) is rotatably connected to the main shaft (200) around the first direction (Y). A first gear transmission assembly (211) and a second gear transmission assembly (212) are located in the main shaft (200), and the second gear transmission assembly (212) is in transmission connection with the first gear transmission assembly (211). A first connecting rod (221) is rotatably connected to the first rotating arm (201) and the first gear transmission assembly (211), and a second connecting rod (222) is rotatably connected to the second rotating arm (202) and the second gear transmission assembly (212). The rotating shaft mechanism of the display terminal does not require a connecting component penetrating the main shaft, thereby increasing the contact area between the main shaft and a display screen.

Description

A rotating shaft mechanism and a display terminal

[0001] This application claims priority to Chinese Patent Application No. 202411742096.9, filed on November 28, 2024, entitled "A Rotating Shaft Mechanism and a Display Terminal", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of foldable display technology, and in particular to a hinge mechanism and a display terminal. Background Technology

[0003] With the continuous development of display technology, foldable display terminals are gradually becoming a development trend for future mobile electronic products. When unfolded, foldable display terminals offer a larger display area, enhancing the viewing experience. When folded, they achieve a smaller size, making them easy for users to carry. However, during testing or use, the screen of foldable display terminals is easily damaged, thus reducing the user experience. Summary of the Invention

[0004] This application provides a hinge mechanism and a display terminal to alleviate the problem that the screen of a foldable display terminal is easily damaged during testing or use.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] One aspect of this application provides a rotating shaft mechanism, which includes a main shaft, a first rotating wall, a second rotating wall, a first gear transmission assembly, a second gear transmission assembly, a first connecting rod, and a second connecting rod. A portion of the first rotating arm is located within the main shaft, and the first rotating arm is rotatably connected to the main shaft about a first direction. The first direction is the extension direction of the main shaft. Along a second direction, the first rotating arm and the second rotating arm are respectively located on both sides of the main shaft, a portion of the second rotating arm is located within the main shaft, and the second rotating arm is rotatably connected to the main shaft about the first direction, which is perpendicular to the first direction. The first gear transmission assembly is located within the main shaft and is disposed between the first rotating arm and the second rotating arm. The second gear transmission assembly is located within the main shaft and is rotatably connected to the first gear transmission assembly. The first connecting rod is located within the main shaft and is disposed between the first rotating arm and the first gear transmission assembly, rotatably connected to both the first rotating arm and the first gear transmission assembly. The second connecting rod is located inside the main shaft and is positioned between the second rotating arm and the second gear transmission assembly. The second connecting rod is rotatably connected to the second rotating arm and to the second gear transmission assembly.

[0007] Based on this, on the one hand, during the rotation of the first rotating arm relative to the main shaft, at least one gear in the first gear transmission assembly can be driven to rotate via the first connecting rod. Furthermore, since the first gear transmission assembly is connected to the second gear transmission assembly, the first gear transmission assembly can drive the gear in the second gear transmission assembly to rotate. Additionally, the second gear transmission assembly can drive the second rotating arm to rotate relative to the main shaft via the second connecting rod. Moreover, both the first and second gear transmission assemblies are located within the main shaft, with the first gear transmission assembly being connected to the portion of the first rotating arm within the main shaft, and the second gear transmission assembly being connected to the portion of the second rotating arm within the main shaft. Therefore, in this application, there is no need to provide a connecting component penetrating the main shaft to connect the first and second gear transmission assemblies to the first and second housings respectively. Therefore, the portion of the main shaft covering the first and second gear transmission assemblies does not need to have openings, thus ensuring that the portion of the main shaft covering the first and second gear transmission assemblies maintains structural integrity. This increases the contact area between the spindle and the display screen, improving the spindle's support performance for the display screen and thus mitigating the problem of screen damage (e.g., black spots or display failure) when foldable display terminals are dropped.

[0008] On the other hand, the first link can form a revolute joint with both the first rotating arm and the first gear transmission assembly, and the second link can form a revolute joint with both the second rotating arm and the second gear transmission assembly. Compared to a sliding joint, a revolute joint requires less linear travel, thus reducing the degree of damage to the structures of the first rotating arm, the first gear transmission assembly, the second rotating arm, and the second gear transmission assembly. Furthermore, the dimensional accuracy requirements for a revolute joint are lower than those for a sliding joint. In addition, sliding joints are more prone to jamming during a drop of the display terminal.

[0009] In one optional embodiment, the first gear transmission assembly includes a first gear rotatably connected to a first connecting rod. The second gear transmission assembly includes a second gear rotatably connected to a second connecting rod. The first connecting rod includes a first rotating shaft, a second rotating shaft, and a first connecting shaft. At least a portion of the first rotating shaft extends into a first rotating arm, and the first rotating shaft is rotatably connected to the first rotating arm. At least a portion of the second rotating shaft extends into the first gear, and the second rotating shaft is rotatably connected to the first gear. The extension directions of the first and second rotating shafts do not coincide. Furthermore, the first connecting shaft is located between the first and second rotating shafts, and its two ends are respectively connected to the first and second rotating shafts. Due to the structural layout limitations in the rotating shaft mechanism, the rotation centers of the first rotating arm and the first gear do not coincide. In this case, the first rotating arm and the first gear, whose rotation centers do not coincide, can be rotatably connected by the aforementioned first connecting rod. Similarly, due to the structural layout limitations in the rotating shaft mechanism, the rotation centers of the second rotating arm and the second gear do not coincide. In this case, the second rotating arm and the second gear, whose rotation centers do not coincide, can be rotatably connected by the aforementioned second connecting rod.

[0010] In one optional embodiment, the spindle includes a shaft cover and a shaft seat. The shaft cover is fastened to the shaft seat, and the surface of the shaft cover facing the shaft seat has a recessed first arc surface, while the surface of the shaft seat facing the shaft cover has a convex second arc surface. A first rotating arm includes a first arc arm located between the shaft cover and the shaft seat. The first arc arm has a third arc surface and a fourth arc surface. The third arc surface rotatably engages with the first arc surface, and the fourth arc surface rotatably engages with the second arc surface. The first arc arm of the first rotating arm can be an arc structure, and the axis of the first arc arm can be a virtual axis. When the shaft cover is fastened to the shaft seat, an arc groove can be formed between the first arc surface and the second arc surface. The first arc arm can extend into the arc groove within the spindle. The shapes of the first arc arm and the arc groove match so that the first arc arm slides in the arc groove via a virtual axis, thereby achieving a rotational connection between the first rotating arm and the spindle. Furthermore, relative to the shaft seat, a first rotating shaft is disposed at the end of the first rotating arm facing the shaft cover, such that the first rotating shaft is disposed at the end of the first rotating arm away from the rotation center of the first rotating arm. In this case, the radius of the motion trajectory of the first rotating shaft on the first rotating arm is large, and the first rotating arm can more easily drive the first rotating shaft to rotate around the rotation center of the first rotating arm, which is beneficial to increasing the minimum transmission ratio between the first rotating arm and the first gear.

[0011] In one optional embodiment, a first mounting hole is provided at the end of the first rotating arm facing the first rotating shaft, and a portion of the first rotating shaft is located within the first mounting hole. A first opening is provided on the third arc surface. The first opening communicates with the first mounting hole. The shaft cover is fastened to the first opening, and the inner wall of the first mounting hole and the first arc surface limit the first rotating shaft, preventing the first rotating shaft from disengaging from the first mounting hole during rotation.

[0012] In one optional embodiment, the first gear includes a first gear body and a first connecting portion. The first connecting portion is disposed on the side of the first gear body facing the first rotating arm, and a second rotating shaft extends into the first connecting portion. The second rotating shaft is disposed at the end of the first connecting portion opposite to the rotation center of the first gear. This avoids damage to the structure of the teeth of the first gear caused by the structure on the first gear for mounting the second rotating shaft.

[0013] In one optional embodiment, the first gear and the second gear are located between the first rotating arm and the second rotating arm. In some embodiments of this application, when the height of the main shaft is small, the diameters of the first gear and the second gear cannot be set too large due to height limitations. Therefore, when the length of the main shaft along the first direction is large, in order to enable the first rotating arm and the second rotating arm to move synchronously, the first gear and the second gear can be positioned between the first rotating arm and the second rotating arm. The first rotating arm can drive the second rotating arm to rotate synchronously via the first connecting rod, the meshing first gear and the second gear, and the second connecting rod, ultimately causing the first housing and the second housing to move synchronously.

[0014] In one optional embodiment, the first gear transmission assembly further includes a third gear located on the side of the first gear opposite to the first rotating arm, and the third gear meshes with the first gear. The second gear transmission assembly further includes a fourth gear located on the side of the second gear opposite to the second rotating arm, and the fourth gear meshes with the second gear and is drively connected to the third gear. In this way, even with a relatively small spindle height, and even if the spindle length is further increased, the first rotating arm can still drive the second rotating arm to rotate synchronously via the first connecting rod, the meshing first, third, fourth, and second gears, and the second connecting rod, ultimately causing the first housing and the second housing to move synchronously.

[0015] In one optional embodiment, the first rotating arm and the first gear transmission assembly have a first minimum transmission ratio I1, where I1 ≥ 0.5. The second rotating arm and the second gear transmission assembly have a second minimum transmission ratio I2, where I2 ≥ 0.5. Considering the influence of the installation clearance between the first gear and the first connecting rod, when I1 ≥ 0.5, the first rotating arm can drive the first gear to rotate, which in turn drives the second gear to rotate, and the second gear drives the second rotating arm to rotate, thereby achieving synchronization of the rotating shaft mechanism. Similarly, when the second minimum transmission ratio between the second rotating arm and the second gear transmission assembly (i.e., the aforementioned second gear) satisfies I2 ≥ 0.5, the installation clearance between the second connecting rod and the second rotating arm, and between the second connecting rod and the second gear, can be reduced, thus reducing the loss in the transmission ratio between the second rotating arm and the second connecting rod, and between the second gear and the second connecting rod. Furthermore... Wherein, when the first rotating arm and the second rotating arm move synchronously, the first minimum transmission ratio I1 between the first rotating arm and the first gear transmission assembly (i.e., the first gear) can be the same as the second minimum transmission ratio between the second rotating arm and the second gear transmission assembly (i.e., the second gear) (i.e., I1 = I2).

[0016] In one optional embodiment, the rotation radius of either the first gear or the second gear is smaller than the rotation radius of either the first rotating arm or the second rotating arm. This allows the angular velocity of the first rotating arm to be greater than the angular velocity of the first gear, thereby making the first minimum transmission ratio I1 between the first rotating arm and the first gear greater than 1. Similarly, the angular velocity of the second rotating arm can be greater than the angular velocity of the second gear, thereby making the second minimum transmission ratio I2 between the second rotating arm and the second gear greater than 1.

[0017] In one optional embodiment, the second connecting rod may include a third rotating shaft, a fourth rotating shaft, and a second connecting shaft. At least a portion of the third rotating shaft can extend into the second rotating arm. The arrangement of the third rotating shaft extending into the second rotating arm is similar to that of the first rotating shaft extending into the first rotating arm, and will not be described again here. Furthermore, the portion of the third rotating shaft extending into the second rotating arm can be rotatably connected to the second rotating arm, thereby forming the aforementioned third rotating pair between the third rotating shaft and the second rotating arm. Additionally, at least a portion of the fourth rotating shaft extends into the second gear. The arrangement of the fourth rotating shaft extending into the second gear is similar to that of the second rotating shaft extending into the first gear, and will not be described again here. Furthermore, the fourth rotating shaft can be rotatably connected to the second gear. In this case, the fourth rotating shaft can form the aforementioned fourth rotating pair with the second gear.

[0018] In another aspect, this application provides a display terminal, including a display screen, a first housing, a second housing, and any of the hinge mechanisms described above. The hinge mechanism is located between the first housing and the second housing, and the display screen is connected to both the first and second housings. The display screen covers the hinge mechanism. The above-described display terminal has the same technical effects as the hinge mechanism provided in the foregoing embodiments, and will not be repeated here. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of a display terminal provided in an embodiment of this application;

[0020] Figure 2 is a schematic diagram of another display terminal provided in an embodiment of this application;

[0021] Figure 3 is a schematic diagram of the structure of another display terminal provided in an embodiment of this application;

[0022] Figure 4 is a schematic diagram of another display terminal provided in an embodiment of this application;

[0023] Figure 5 is a structural schematic diagram of another display terminal provided in an embodiment of this application;

[0024] Figure 6 is a structural schematic diagram of another display terminal provided in an embodiment of this application;

[0025] Figure 7 is a schematic diagram of one structure of the rotating shaft mechanism in Figure 6;

[0026] Figure 8 is a schematic diagram of the structure of the first rotating arm in Figure 7;

[0027] Figure 9 is a cross-sectional view obtained by cutting along the dashed line A1-A2 in Figure 6;

[0028] Figure 10 is another sectional view obtained by cutting along the dashed line A1-A2 in Figure 6;

[0029] Figure 11 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0030] Figure 12 is a schematic diagram of the rotating shaft mechanism provided in an embodiment of this application;

[0031] Figure 13 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0032] Figure 14 is a schematic diagram of the structure of a display terminal provided by related technologies;

[0033] Figure 15 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0034] Figure 16 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0035] Figure 17 is a structural schematic diagram of the first connecting rod in Figure 16;

[0036] Figure 18 is an enlarged view of point B3 in Figure 16;

[0037] Figure 19 is another enlarged view of point B3 in Figure 16;

[0038] Figure 20 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0039] Figure 21 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0040] Figure 22 is a cross-sectional view obtained by cutting along the dashed line A1-A2 in Figure 6;

[0041] Figure 23 is an enlarged view of point B4 in Figure 16;

[0042] Figure 24 is another sectional view obtained by cutting along the dashed line A1-A2 in Figure 6;

[0043] Figure 25 is a schematic diagram of another structure of the rotating shaft mechanism in Figure 6;

[0044] Figure 26 is another sectional view obtained by cutting along the dashed line A1-A2 in Figure 6.

[0045] Reference numerals: 01-Display terminal; 10-Display screen; 11-First housing; 12-Second housing; 20-Rotating shaft mechanism; 13-Third housing; 200-Main shaft; 201-First rotating arm; 202-Second rotating arm; 203-First fixed frame; 204-Second fixed frame; 2001-Shaft cover; 2002-Shaft seat; 2011-First sliding arm; 2012-First arc arm; 2021-Second arc arm; 2022-Second sliding arm; 2003-Circular arc groove; S1-First arc surface; S2-Second arc surface; S3-Third arc surface; S4-Fourth arc surface; 221-First connecting rod; 211-First gear transmission assembly; 212-Second gear transmission assembly; 222-Second connecting rod; 31-First rotating pair; 32-Second rotating pair; 33-Third rotating pair; 34-Fourth rotating pair Moving pair; 301-First mounting hole; 302-Second mounting hole; 40-Rotating shaft; 401-Left opening; 402-Right opening; 41-Left housing; 42-Right housing; 43-Left connecting component; 44-Right connecting component; 2111-First gear; 2121-Second gear; 2211-First rotating shaft; 2212-Second rotating shaft; 2213-First connecting shaft; 21112-First connecting part; 21110-First gear body; 303-First opening; 2221-Third rotating shaft; 2222-Fourth rotating shaft; 2223-Second connecting shaft; 2113-Third gear; 2124-Fourth gear. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0047] In the following description, the terms "first," "second," etc., are used for ease of description only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0048] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly. For example, "connection" may be a fixed mechanical connection, a detachable mechanical connection, or an integral part; or, "connection" may be a direct connection or an indirect connection through an intermediate medium.

[0049] In the embodiments of this application, the terms "vertical" and "parallel" respectively indicate approximately vertical and approximately parallel within a certain error range. This error range can be a range where the deviation angle relative to absolute verticality and absolute parallelism is less than or equal to 5°, 8°, or 10°, respectively, and is not specifically limited here.

[0050] In the embodiments of this application, directional terms such as "up," "down," "left," and "right" may be defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0051] In the accompanying drawings of the embodiments of this application, components are represented by guide lines with arrows; parts are represented by guide lines only; openings, holes, and other openings are represented by guide lines with wavy lines at the ends.

[0052] This application provides a display terminal that can be applied to various communication systems or protocols, such as Bluetooth (BT) communication technology, Global Positioning System (GPS) communication technology, Global System for Mobile Communication (GSM) communication technology, Wireless Fidelity (WiFi) communication technology, Wideband Code Division Multiple Access (WCDMA) communication technology, Long Term Evolution (LTE), 5G communication technology, and other future communication technologies.

[0053] The display terminal in this application embodiment can be a mobile phone, tablet computer, laptop computer, smart home device, smart wearable device (e.g., smartwatch, smart bracelet, smart glasses, smart helmet), virtual reality (VR) display terminal, augmented reality (AR) display terminal, etc. The display terminal can also be a handheld device with wireless communication capabilities, a computing device, or other processing device connected to a wireless modem, an in-vehicle device, a display terminal in a 5G network, or a display terminal in a future evolved public land mobile network (PLMN), etc., and this application embodiment is not limited to these categories.

[0054] In some embodiments, the display terminal may have a display function. In this case, the display terminal may include a display screen and a processor electrically connected to the display screen. The processor may provide display data to the display screen to drive the display screen to display images. For example, the processor may include one or more processing units, such as an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors.

[0055] In addition, the aforementioned display terminal may also include an external memory interface electrically connected to the processor, internal memory, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, an antenna, a mobile communication module, a wireless communication module, an audio module, a speaker, a receiver, a microphone, a headphone jack, a sensor module, buttons, and a camera. The sensor module may include pressure sensors, gyroscopes, barometric pressure sensors, magnetic sensors, accelerometers, proximity sensors, near-field sensors, fingerprint sensors, temperature sensors, touch sensors, ambient light sensors, and bone conduction sensors.

[0056] For ease of explanation, the following description uses a foldable phone as an example of the display terminal. In this case, as shown in FIG1, the display terminal 01 may include a display screen 10. In some embodiments of this application, the display screen 10 may be a self-emissive display screen, such as an organic light-emitting diode (OLED) display screen, a micro (or mini) light-emitting diode (LED) display screen, or a quantum dot light-emitting diode (QLED) display screen, etc. Alternatively, in other embodiments of this application, the display screen 10 may also be a liquid crystal display (LCD) that requires a backlight.

[0057] Furthermore, in order to support the display screen 10 during the folding or flattening process of the display terminal 01, in some embodiments, the display terminal 01 may also include two housings. For example, the two housings may be a first housing 11 and a second housing 12, and a pivot mechanism 20, as shown in FIG2, is disposed on the back of the display screen 10 (the surface opposite to the display surface of the display screen 10). The pivot mechanism 20 is located between the first housing 11 and the second housing 12, and the first housing 11 and the second housing 12 can be rotatably connected to the pivot mechanism 20, so that the first housing 11 and the second housing 12 can rotate around the pivot mechanism 20. The display screen 10 shown in FIG1 is connected to the first housing 11 and the second housing 12, and the display screen 10 can cover the pivot mechanism 20.

[0058] For example, either the first housing 11 or the second housing 12 described above may include a middle frame and a rear housing located on the side of the middle frame opposite to the display screen 10. The middle frame and the rear housing may enclose a receiving space for accommodating components such as circuit boards, batteries, cameras, and sensors.

[0059] Based on this, when the display terminal 01 is in the flattened state as shown in Figure 1, the included angle β between the first housing 11 and the second housing 12 is or approximately 180°. Alternatively, where a certain angular tolerance is allowed, for example, the included angle β between the first housing 11 and the second housing 12 can also be a value such as 165°, 177°, or 185°. In this case, the surfaces of the first housing 11 and the second housing 12 facing the display screen 10 can be on or approximately on the same plane.

[0060] Alternatively, when the display terminal 01 is initially in the flattened state as shown in Figure 1, the user can hold the display terminal 01 and apply external force to the first housing 11 and the second housing 12 to fold the first housing 11 and the second housing 12, so that the first housing 11 and the second housing 12 rotate relative to the rotating shaft mechanism 20, thereby folding the display screen 10, and finally making the display terminal 01 in the closed state as shown in Figure 3.

[0061] For example, in some embodiments of this application, the folded state of the display terminal 01 can refer to the angle β between the first housing 11 and the second housing 12 being less than 180°. As shown in Figure 3, the angle β between the first housing 11 and the second housing 12 can be 0°, in which case the folded state of the display terminal 01 can also be called the closed state. Alternatively, where a certain angular tolerance is allowed, the above-mentioned closed state can also be that the angle β between the first housing 11 and the second housing 12 is 2° or 5°, etc.

[0062] To illustrate the positional relationships of the various components in the display terminal 01, an XYZ coordinate system is established in the accompanying drawings. For example, the XY plane can be parallel to the display surface (the surface used to display images) of the display screen 10 in the flattened state shown in Figure 1. The Z direction is the stacking direction between the first housing 11 (or the second housing 12) and the display screen 10; that is, the Z direction can be the thickness of the display terminal 01 or the thickness direction of the aforementioned housing. The Y direction can be the extension direction of the pivot mechanism 20, and the X direction can be perpendicular to the extension direction of the pivot mechanism 20. For ease of explanation, the Y direction will be referred to as the first direction Y, the X direction as the second direction X, and the Z direction as the third direction Z.

[0063] The above example illustrates the situation where, in the folded state of the display terminal 01, as shown in Figure 3, the first housing 11 and the second housing 12 are enclosed by the display screen 10, with the display surface of the display screen 10 serving as the outer side of the display terminal. In this case, the display terminal 01 can be referred to as an outward-folding display terminal. Alternatively, in some other embodiments of this application, when the display terminal 01 is in the folded state, the display screen 10 is enclosed between the first housing 11 and the second housing 12. In this case, the display terminal 01 can be referred to as an inward-folding display terminal. This application does not limit the folding method of the display terminal 01.

[0064] In some other embodiments of this application, the display terminal 01 may further include three or more housings. For example, as shown in FIG4, when the display terminal 01 includes three housings, such as a first housing 11, a second housing 12, and a third housing 13, the first housing 11, the second housing 12, and the third housing 13 can be folded into a "G" shape. In this case, with the first housing 11 and the second housing 12 in a closed state, the portion of the display screen 10 covered by the first housing 11 and the second housing 12 is located between the first housing 11 and the second housing 12. Furthermore, with the third housing 13 and the second housing 12 in a closed state, the portion of the display screen 10 covered by the third housing 13 is located between the third housing 13 and the second housing 12.

[0065] Alternatively, as shown in Figure 5, when the first housing 11, the second housing 12, and the third housing 13 are all in a closed state, they can be folded into an "S" shape. In this case, the portion of the display screen 10 covered by the third housing 13 and the second housing 12 is located between the third housing 13 and the second housing 12. Furthermore, when the first housing 11 and the second housing 12 are in a closed state, the portion of the display screen 10 covered by the first housing 11 is located on the side of the first housing 11 facing away from the second housing 12, so that this portion of the display screen 10 is exposed to the outside of the entire display terminal 01.

[0066] The above description uses an example where the display terminal 01 includes two or three housings. In other embodiments of this application, the display terminal 01 may include three or more housings. This application does not limit the number of housings, as long as there are two or more. For any of the above-mentioned display terminal 01 types, the aforementioned hinge mechanism 20 can be provided between two adjacent housings (as shown in Figure 2). For ease of explanation, the following description mainly uses a two-fold display terminal 01 as an example to illustrate the structure of the hinge mechanism 20. The structure of the hinge mechanism in other types of display terminals 01 is similar and will not be repeated here.

[0067] The structure of the rotating shaft mechanism 20 is illustrated below. In some embodiments of this application, as shown in FIG6, the rotating shaft mechanism 20 may include a main shaft 200, a first rotating arm 201, and a second rotating arm 202. The first rotating arm 201 and the second rotating arm 202 may be located on opposite sides of the main shaft 200 along the second direction X. In some embodiments, the rotating shaft mechanism 20 may further include a first fixing frame 203 and a second fixing frame 204, which may be located on opposite sides of the main shaft 200. The extending direction of the main shaft 200 is the same as the extending direction of the rotating shaft mechanism 20, both located in the aforementioned first direction Y.

[0068] Building upon this, as shown in Figure 6, the first rotating arm 201 is positioned closer to the main shaft 200 than the first fixed frame 203. The first fixed frame 203 can be connected to the first housing 11. For example, the first fixed frame 203 and the first housing 11 can be detachably connected via a threaded connection or similar method. Alternatively, the first fixed frame 203 and the first housing 11 can be connected via an adhesive layer or similar bonding method. Furthermore, the first fixed frame 203 can also be integrated with the first housing 11 as a single structural component through injection molding; this application does not limit the specifics of this approach.

[0069] Furthermore, a portion of the first rotating arm 201 is located within the main shaft 200, and the first rotating arm 201 is rotatably connected to the main shaft 200 about a first direction Y. In some embodiments of this application, the first rotating arm 201 is also slidably connected to the first fixed frame 203 along a second direction X. In this case, while the first rotating arm 201 rotates relative to the main shaft 200, the first rotating arm 201 can also slide relative to the first fixed frame 203 along the second direction X, so that the first rotating arm 201 can move closer to or further away from the main shaft 200, thereby causing the first fixed frame 203 to gradually flip to a flattened (or folded) state. In this way, the first rotating arm 201 can drive the first fixed frame 203, thereby driving the first housing 11 connected to the first fixed frame 203 to rotate relative to the main shaft 200.

[0070] Similarly, continuing as shown in Figure 6, the second fixing frame 204 can be connected to the second housing 12. The connection method is the same as that between the first fixing frame 203 and the first housing 11, and will not be repeated here. Furthermore, a portion of the second rotating arm 202 is located within the main shaft 200, and this second rotating arm 202 can be rotatably connected to the main shaft 200 around the first direction Y. In some embodiments of this application, the second rotating arm 202 can be slidably connected to the second fixing frame 204 along the second direction X, thereby causing the second fixing frame 204 to gradually flip to a flattened (or folded) state. In this way, the second fixing frame 204 can be driven by the second rotating arm 202, thereby causing the second housing 12 connected to the second fixing frame 204 to rotate relative to the main shaft 200.

[0071] This application does not limit the number of the aforementioned hinge mechanisms 20. Figure 6 illustrates an example where the display terminal 01 has at least two hinge mechanisms 20, and the main shaft 200 of the two hinge mechanisms 20 is shared. In other embodiments of this application, the display terminal 01 may also have one or more hinge mechanisms 20.

[0072] With the first rotating arm 201 rotatably connected to the main shaft 200 and slidably connected to the first fixed frame 203 along the second direction X; and the second rotating arm 202 rotatably connected to the main shaft 200 and slidably connected to the second fixed frame 204 along the second direction X, the following uses the first rotating arm 201 as an example to illustrate the way in which the first rotating arm 201 or the second rotating arm 202 is rotatably connected to the main shaft 200.

[0073] In some embodiments of this application, as shown in FIG7, the main shaft 200 may include a bearing seat 2002 and a bearing cover 2001, the bearing cover 2001 being fastened to the bearing seat 2002. The aforementioned first rotating arm 201 may include a first arc arm 2012, which may be located inside the main shaft 200, i.e., between the bearing seat 2002 and the bearing cover 2001. When the first rotating arm 201 is slidably connected to the first fixed frame 203, the first rotating arm 201 may further include a first sliding arm 2011 located outside the main shaft 200. The first sliding arm 2011 and the first arc arm 2012 are connected as an integral structure, and the first sliding arm 2011 may be slidably connected to the first fixed frame 203. Similarly, the second rotating arm 202 may include a second arc arm 2021 and a second sliding arm 2022. The arrangement of the second arc arm 2021 and the second sliding arm 2022 is the same as described above, and will not be repeated here.

[0074] Therefore, in order for the first rotating arm 201 to rotate relative to the main shaft 200, for example, the first rotating arm 201 can be rotatably connected to the main shaft 200 using a virtual axis. Here, the virtual axis can refer to the axis of a component with an arc-shaped structure, where the center of the arc-shaped structure can serve as the virtual axis. The two rotatably connected components can rotate relative to the virtual axis. Furthermore, as the two rotatably connected components rotate relative to each other, the position of the virtual axis remains unchanged.

[0075] For example, as shown in Figure 8, the first arc arm 2012 of the first rotating arm 201 can serve as the aforementioned arc structure, and the axis of the first arc arm 2012 can serve as the aforementioned virtual axis. Furthermore, the axis of the first arc arm 2012 is the rotation center O1-O2 of the first rotating arm 201. The first arc arm 2012 has a third arc surface S3 and a fourth arc surface S4. In addition, as shown in Figure 9 (a cross-sectional view obtained by cutting along the dashed lines A1-A2 in Figure 6), the surface of the shaft cover 2001 facing the shaft seat 2002 can have a recessed first arc surface S1, and the surface of the shaft seat 2002 facing the shaft cover 2001 has a raised second arc surface S2. When the shaft cover 2001 is fastened onto the shaft seat 2002, an arc groove 2003 can be formed between the first arc surface S1 and the second arc surface S2.

[0076] As shown in Figure 10 (another sectional view obtained by cutting along the dashed line A1-A2 in Figure 6), the first arc arm 2012 can extend into the arc groove 2003 (as shown in Figure 9) within the main shaft 200. The shapes of the first arc arm 2012 and the arc groove 2003 are matched so that the first arc arm 2012 can slide in the arc groove 2003 to achieve a rotational connection between the first rotating arm 201 and the main shaft 200. In order to match the shape of the arc groove 2003 formed between the first arc arm 2012 and the bearing seat 2002 and the bearing cover 2001, the third arc surface S3 of the first arc arm 2012 can be rotatably engaged with the first arc surface S1 of the bearing cover 2001, and the fourth arc surface S4 of the first arc arm 2012 can be rotatably engaged with the second arc surface S2 of the bearing seat 2002.

[0077] The above example illustrates the rotational connection between the first rotating arm 201 (or the second rotating arm 202) and the main shaft 200 using a virtual axis. In other embodiments of this application, the first rotating arm 201 (or the second rotating arm 202) can be rotatably connected to the main shaft 200 via a physical shaft (e.g., a pin). The axis of this physical shaft can be the rotation center O1-O2 of the first rotating arm 201.

[0078] The above example illustrates the following: the first rotating arm 201 is rotatably connected to the main shaft 200 and slidably connected to the first fixed frame 203 along the second direction X; the second rotating arm 202 is rotatably connected to the main shaft 200 and slidably connected to the second fixed frame 204 along the second direction X. In other embodiments of this application, the first rotating arm 201 may be rotatably connected to both the main shaft 200 and the first fixed frame 203, and the second rotating arm 202 may be rotatably connected to both the main shaft 200 and the second fixed frame 204. Alternatively, in still other embodiments of this application, the first rotating arm 201 may be rotatably connected to the main shaft 200 and also connected to the first fixed frame 203, thereby fixing the relative position between the first rotating arm 201 and the first fixed frame 203. Similarly, the second rotating arm 202 may be rotatably connected to the main shaft 200 and also connected to the second fixed frame 204, thereby fixing the relative position between the second rotating arm 202 and the second fixed frame 204.

[0079] This application does not limit the connection method between the first rotating arm 201 and the first fixed frame 203, or the connection method between the second rotating arm 202 and the second fixed frame 204, as long as both the first rotating arm 201 and the second rotating arm 202 are rotatably connected to the main shaft 200. In some other embodiments of this application, the first fixed frame 203 and the second fixed frame 204 in FIG6 can be removed. By sliding or rotating the first rotating arm 201 to the first housing 11 and sliding or rotating the second rotating arm 202 to the second housing 12, the first rotating arm 201 and the second rotating arm 202 can directly drive the first housing 11 and the second housing 12 to rotate relative to the main shaft 200 during the rotation of the first rotating arm 201 and the second rotating arm 202 relative to the main shaft 200.

[0080] In this embodiment, during the rotation of the first housing 11 and the second housing 12 relative to the main shaft 200, in order to synchronize the rotation angles of the first housing 11 and the second housing 12, as shown in FIG11 (another structural schematic diagram of the shaft mechanism in FIG6), the shaft mechanism 20 may further include a first gear transmission assembly 211 and a second gear transmission assembly 212, a first connecting rod 221 and a second connecting rod 222. The first gear transmission assembly 211 is located inside the main shaft 200. Along the first direction Y, the first gear transmission assembly 211 is disposed between the first rotating arm 201 and the second rotating arm 202. The second gear transmission assembly 212 is located inside the main shaft 200, and the second gear transmission assembly 212 can be transmittedly connected to the first gear transmission assembly 211. Along the first direction Y, the second gear transmission assembly 212 is disposed between the first rotating arm 201 and the second rotating arm 202.

[0081] In this embodiment, "transmission connection" refers to a connection relationship capable of realizing mechanical transmission, such as rotation, movement, etc. This "transmission connection" includes, but is not limited to, fixed mechanical connections, detachable connections (e.g., snap-fit, threaded connections), and surface contact such as abutment and meshing. For example, in the case where either the first gear transmission assembly 211 or the second gear transmission assembly 212 may include one gear or two or more meshing gears, the transmission connection between the second gear transmission assembly 212 and the first gear transmission assembly 211 means that at least one gear in the second gear transmission assembly 212 can mesh with at least one gear in the first gear transmission assembly 211.

[0082] Based on this, continuing as shown in Figure 11, the first connecting rod 221 can be located within the main shaft 200. Furthermore, along the first direction Y, the first connecting rod 221 can be disposed between the first rotating arm 201 and the first gear transmission assembly 211. This first connecting rod 221 can be rotatably connected to the first rotating arm 201 to form a first rotating pair 31 (as shown in Figure 12), and the first connecting rod 221 can be rotatably connected to the first gear transmission assembly 211 to form a second rotating pair 32 (as shown in Figure 12).

[0083] For example, the first connecting rod 221 can extend into the first rotating arm 201 and the first gear transmission assembly 211, so that the first connecting rod 221 is rotatably connected to the first rotating arm 201 and the first gear transmission assembly 211, respectively. In some embodiments, as shown in FIG13, the first rotating arm 201 may have a first mounting hole 301 that matches the first connecting rod 221. A portion of the first connecting rod 221 may be located in the first mounting hole 301, and the first connecting rod 221 may rotate within the first mounting hole 301 to achieve a rotatable connection between the first connecting rod 221 and the first rotating arm 201. In some embodiments, when the portion of the first connecting rod 221 extending into the first rotating arm 201 is cylindrical, the first mounting hole 301 may be a cylindrical hole.

[0084] Furthermore, continuing as shown in Figure 13, a second mounting hole 302 matching the first connecting rod 221 can be formed on the first gear transmission assembly 211. A portion of the first connecting rod 221 can be located within the second mounting hole 302, and the first connecting rod 221 can rotate within the second mounting hole 302 to achieve a rotatable connection between the first connecting rod 221 and the first gear transmission assembly 211. In some embodiments, when the portion of the first connecting rod 221 extending into the first gear transmission assembly 211 is cylindrical, the second mounting hole 302 can be a cylindrical hole.

[0085] Thus, continuing as shown in Figure 13, during the process of the first rotating arm 201 driving at least one gear in the first gear transmission assembly 211 to rotate via the first connecting rod 221, both ends of the first connecting rod 221 can rotate within the aforementioned first mounting hole 301 and second mounting hole 302. Compared to the scheme where at least one end of the connecting rod forms a sliding pair with the rotating arm or gear, the first connecting rod 221 in this application does not require the large linear stroke required for a sliding pair, thereby reducing the degree of damage to the structure of the first rotating arm 201 and the first gear transmission assembly by the aforementioned first mounting hole 301 and second mounting hole 302, and further reducing the impact on the structural strength of the first rotating arm 201 and the first gear transmission assembly.

[0086] Furthermore, for schemes where at least one end of the connecting rod forms a sliding pair with the rotating arm or gear, high dimensional accuracy is required for the clearance and other dimensions between the connecting rod and the groove on the rotating arm or gear in order for the connecting rod to slide relative to the rotating arm or gear respectively. In contrast, in this application, continuing as shown in FIG13, it is sufficient to ensure that the portion of the first connecting rod 221 extending into the first rotating arm 201 (or the first gear transmission assembly 211) can rotate relative to the first rotating arm 201 (or the first gear transmission assembly 211).

[0087] Furthermore, continuing as shown in Figure 13, in the case where at least one end of the connecting rod forms a sliding pair with the rotating arm or gear, when the display terminal falls, the connecting rod will move within the groove opened on the rotating arm or gear, causing the connecting rod to get stuck in the groove and affecting the movement of the rotating arm or gear. In contrast, in this application, the first connecting rod 221 rotates within the first mounting hole 301 and the second mounting hole 302, and the gap between the first connecting rod 221 and the hole walls of the first mounting hole 301 and the second mounting hole 302 is smaller, thereby reducing the probability of the first connecting rod 221 getting stuck in the mounting hole when the display screen falls.

[0088] Similarly, continuing as shown in Figure 11, the second connecting rod 222 can be located within the main shaft 200. Furthermore, the second connecting rod 222 is positioned between the second rotating arm 202 and the second gear transmission assembly 212. The second connecting rod 222 is rotatably connected to the second rotating arm 202 to form a third rotating pair 33 (as shown in Figure 12), and the second connecting rod 222 is rotatably connected to the second gear transmission assembly 212 to form a fourth rotating pair 34 (as shown in Figure 12). Additionally, mounting holes matching the first connecting rod 221 can also be formed on the second rotating arm 202 and the second gear transmission assembly 212. The method of setting the mounting holes and their technical effects are the same as described above and will not be repeated here.

[0089] Based on this, continuing as shown in Figure 11, as described above, on the one hand, the first connecting rod 221 is located between the first rotating arm 201 and the first gear transmission assembly 211, and the first connecting rod 221 is rotatably connected to both the first rotating arm 201 and the first gear transmission assembly 211. Therefore, during the rotation of the first rotating arm 201 relative to the main shaft 200, at least one gear in the first gear transmission assembly 211 can be driven to rotate via the first connecting rod 221. Furthermore, since the first gear transmission assembly 211 is connected to the second gear transmission assembly 212, the first gear transmission assembly 211 can drive the gear in the second gear transmission assembly 212 to rotate.

[0090] Furthermore, continuing as shown in Figure 11, the second connecting rod 222 is located between the second rotating arm 202 and the second gear transmission assembly 212, and the second connecting rod 222 is rotatably connected to both the second rotating arm 202 and the second gear transmission assembly 212. Therefore, the second gear transmission assembly 212 can drive the second rotating arm 202 to rotate relative to the main shaft 200 through the second connecting rod 222. When the gears of the first rotating arm 201 and the second rotating arm 202 are identical, the structural dimensions of the first connecting rod 221 and the second connecting rod 222 are identical, and the structural dimensions of the first gear transmission assembly 211 and the second gear transmission assembly 212 are identical, synchronous rotation of the first rotating arm 201 and the second rotating arm 202 can be achieved, thereby synchronizing the rotation angles of the first housing 11 and the second housing 12 (as shown in Figure 6).

[0091] On the other hand, in related technologies, as shown in Figure 14, in order to enable the left housing 41 and the right housing 42 to rotate synchronously, a left opening 401 and a right opening 402 need to be provided on the rotating shaft 40. A left connecting member 43 extends out of the left opening 401. This left connecting member 43 is connected to the left housing 41 and the synchronization mechanism (e.g., gears) within the rotating shaft 40. Similarly, a right connecting member 44 extends out of the right opening 402. This right connecting member 44 is connected to the right housing 42 and the synchronization mechanism (e.g., gears) within the rotating shaft 40. In this case, when a display screen covers the rotating shaft 40, the left opening 401 and the right opening 402 on the rotating shaft 40 will reduce the supporting performance of the rotating shaft 40 for the display screen. For example, during a drop, black spots may appear at the locations where the display screen covers the left opening 401 and the right opening 402, or the display screen may fail.

[0092] In comparison, continuing as shown in Figure 11, as described above, both the first gear transmission assembly 211 and the second gear transmission assembly 212 are located within the main shaft 200. The first gear transmission assembly 211 is connected to the portion of the first rotating arm 201 located within the main shaft 200, and the second gear transmission assembly 212 is connected to the portion of the second rotating arm 202 located within the main shaft 200. Therefore, in this application, it is unnecessary to provide a connecting component penetrating the main shaft 200 to connect the first gear transmission assembly 211 and the second gear transmission assembly 212 to the first housing 11 and the second housing 12 (as shown in Figure 6), respectively.

[0093] Therefore, as shown in Figure 15, the portion of the shaft cover 2001 (or the shaft seat 2002 shown in Figure 11) covering the first gear transmission assembly 211 and the second gear transmission assembly 212 (as shown in Figure 11), i.e., position B2 in Figure 15, does not require an opening. This allows the portion of the shaft cover 2001 (or the shaft seat 2002 shown in Figure 11) located at position B2 to maintain structural integrity. This increases the contact area between the main shaft 200 and the display screen 10, improving the support performance of the main shaft 200 for the display screen 10, thereby mitigating the problem that the screen of the folding display terminal 01 is easily damaged when dropped (e.g., the aforementioned black spots or display screen failure).

[0094] For example, as shown in FIG15, the portion of the shaft cover 2001 covering the first gear drive assembly 211 and the second gear drive assembly 212 (as shown in FIG11) (i.e., position B2 in FIG15) can contact the shaft seat 2002. In this case, the shaft cover 2001 and the shaft seat 2002 can completely enclose the first gear drive assembly 211 and the second gear drive assembly 212 within the main shaft 200. Alternatively, the portion of the shaft cover 2001 covering the first gear drive assembly 211 and the second gear drive assembly 212 (as shown in FIG11) (i.e., position B2 in FIG15) can have a gap with the shaft seat 2002, which is not limited in this application.

[0095] The following provides examples illustrating the specific structures of the first gear transmission assembly 211 and the second gear transmission assembly 212, the transmission connection between them, and the structures of the first connecting rod 221 and the second connecting rod 222. In some embodiments of this application, the first gear transmission assembly 211 may include the first gear 2111 shown in FIG. 16, and the second gear transmission assembly 212 may include the second gear 2121 shown in FIG. 16.

[0096] Continuing as shown in Figure 16, the first gear 2111 is rotatably connected to the first connecting rod 221. The second gear 2121 is rotatably connected to the second connecting rod 222. For example, the first gear 2111 and the second gear 2121 can directly mesh, enabling the first gear transmission assembly 211 and the second gear transmission assembly 212 to be connected in a transmission manner. In this way, the first gear transmission assembly 211 can have only one first gear 2111, and the second gear transmission assembly 212 can have only one second gear 2121. This simplifies the structure of the rotating shaft mechanism 20 by achieving the transmission connection between the first gear transmission assembly 211 and the second gear transmission assembly 212.

[0097] In some embodiments, due to structural layout limitations in the rotating shaft mechanism, the rotation centers of the first rotating arm 201 and the first gear 2111 do not coincide. Therefore, to rotatably connect the first rotating arm 201 and the first gear 2111 whose rotation centers do not coincide, as shown in FIG17, the first connecting rod 221 may include a first rotating shaft 2211, a second rotating shaft 2212, and a first connecting shaft 2213. The extending direction of the first rotating shaft 2211 may not coincide with the extending direction of the second rotating shaft 2212.

[0098] Continuing with Figure 17, the extension direction of the first rotating shaft 2211 refers to the extension direction of the rotation center O3-O4 of the first rotating shaft 2211. The extension direction of the second rotating shaft 2212 refers to the extension direction of the rotation center O5-O6 of the second rotating shaft 2212. In some embodiments of this application, the rotation centers O3-O4 of the first rotating shaft 2211 can be parallel to the rotation centers O5-O6 of the second rotating shaft 2212. Furthermore, in order to connect the first rotating shaft 2211 and the second rotating shaft 2212, whose extension directions do not coincide, the first connecting shaft 2213 can be located between the first rotating shaft 2211 and the second rotating shaft 2212. And, both ends of the first connecting shaft 2213 can be connected to the first rotating shaft 2211 and the second rotating shaft 2212, respectively. In addition, in order to improve the rigidity of the first link 221, the diameters of the first rotating shaft 2211, the second rotating shaft 2212 and the first connecting shaft 2213 can be increased as much as possible, provided that the internal space of the rotating shaft mechanism 20 allows.

[0099] Based on this, in order to enable the first rotating shaft 2211 to be rotatably connected to the first gear 2111 via the first connecting rod 221, as shown in FIG18 (an enlarged view of B3 in FIG16), at least a portion of the first rotating shaft 2211 can extend into the first rotating arm 201. For example, the first rotating arm 201 has the aforementioned first mounting hole 301, and at least a portion of the first rotating shaft 2211 can extend into the first mounting hole 301. Furthermore, the portion of the first rotating shaft 2211 extending into the first rotating arm 201 can be rotatably connected to the first rotating arm 201, thereby forming the aforementioned first rotating pair 31 between the first rotating shaft 2211 and the first rotating arm 201 (as shown in FIG12).

[0100] Furthermore, continuing as shown in Figure 19 (another enlarged view of point B3 in Figure 16), at least a portion of the second shaft 2212 extends into the first gear 2111. For example, the first gear 2111 may have the aforementioned second mounting hole 302, allowing at least a portion of the second shaft 2212 to extend into the second mounting hole 302.

[0101] Therefore, to avoid the second mounting hole 302 damaging the structure of the teeth in the first gear 2111, in some embodiments of this application, the first gear 2111 may include a first gear body 21110 and a first connecting portion 21112. The first connecting portion 21112 may be disposed on the side of the first gear body 21110 facing the first rotating arm 201. The second mounting hole 302 may be provided on the first connecting portion 21112 so that the second rotating shaft 2212 located in the second mounting hole 302 can extend into the first connecting portion 21112. For example, the first connecting portion 21112 may be a cylindrical structure. In this case, the second rotating shaft 2212 can be rotatably connected to the first connecting portion 21112 so that the second rotating shaft 2212 can be rotatably connected to the entire first gear 2111 through the first connecting portion 21112. In this case, the second rotating shaft 2212 and the first gear 2111 can form the second rotating pair 32 (as shown in FIG12). Furthermore, the configuration of the second gear 2121 can be derived in the same way, and will not be elaborated here.

[0102] As described above, continuing as shown in Figure 18, the first rotating shaft 2211 in the first connecting rod 221 is rotatably connected to the first rotating arm 201, and the second rotating shaft 2212 in the first connecting rod 221 is rotatably connected to the first gear 2111. Furthermore, the first rotating shaft 2211 and the second rotating shaft 2212 extend in different directions. In this case, the first rotating arm 201 and the first gear 2111, whose rotation centers do not coincide, can be rotatably connected via the aforementioned first connecting rod 221.

[0103] Continuing from this point, as shown in Figure 18, when the first rotating arm 201 and the first gear 2111, whose rotation centers do not coincide, are rotatably connected by the first connecting rod 221, manufacturing and installation tolerances cause installation gaps between the first rotating arm 201 and the first connecting rod 221, and between the first gear 2111 and the first connecting rod 221. During the process of the first rotating arm 201 driving the first gear 2111 to rotate via the first connecting rod 221, these installation gaps cause a loss in the transmission ratio between the first rotating arm 201 and the first connecting rod 221, and between the first gear 2111 and the first connecting rod 221. This results in the first rotating arm 201 being unable to drive the first gear 2111 to rotate, affecting the synchronization effect of the rotating shaft mechanism.

[0104] To address the aforementioned issues, as shown in Figure 18, in some embodiments of this application, the first rotating arm 201 and the first gear transmission assembly (i.e., the first gear 2111) have a first minimum transmission ratio I1, which can satisfy I1≥0.5. Considering the influence of the installation clearance between the first gear 2111 and the first connecting rod 221, when I1≥0.5, the first rotating arm 201 can drive the first gear 2111 to rotate, which in turn drives the second gear 2121 shown in Figure 16 to rotate, and the second gear 2121 drives the second rotating arm 202 to rotate, thereby achieving synchronization of the rotating shaft mechanism 20. For example, I1 can be 0.5, 0.6, 0.7, 1, or 2.

[0105] The transmission ratio is the ratio of the angular velocities of the two rotating components. For example, the two rotating components can be a first rotating arm 201 and a first gear transmission assembly (i.e., a first gear 2111). Therefore, the transmission ratio between the first rotating arm 201 and the first gear 2111 can be the ratio of the angular velocity of the first rotating arm 201 to the angular velocity of the first gear 2111. Furthermore, during rotation, the transmission ratio between the first rotating arm 201 and the first gear 2111 changes continuously according to different rotation angles. Therefore, the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111 refers to the minimum value among multiple transmission ratios between the first rotating arm 201 and the first gear 2111. In the embodiments of this application, the transmission ratios between the other two rotating components and the minimum transmission ratio can be obtained similarly, and will not be described in detail here.

[0106] Based on this, in order to ensure that the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111 satisfies I1≥0.5, in some embodiments of this application, as shown in FIG11, the first rotating shaft 2211 can be disposed at the end of the first rotating arm 201 facing the shaft cover 2001 relative to the shaft seat 2002, so that the first rotating shaft 2211 is disposed at the end of the first rotating arm 201 away from the rotation center of the first rotating arm 201, thereby increasing the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111. For example, so that the first minimum transmission ratio I1 can satisfy I1≥0.5.

[0107] For example, in order to position the first rotating shaft 2211 at the end of the first rotating arm 201 away from the rotation center of the first rotating arm 201, as shown in FIG20, when the first rotating arm 201 has a first arc arm 2012, the aforementioned first mounting hole 301 is formed on the first arc arm 2012 facing the first rotating shaft 2211. Furthermore, the first arc arm 2012 has a third arc surface S3 and a fourth arc surface S4. Based on this, a first opening 303 is formed on the third arc surface S3. The first opening 303 can communicate with the first mounting hole 301. In this case, when a portion of the first rotating shaft 2211 is located within the first mounting hole 301, a portion of the first rotating shaft 2211 can be exposed through the first opening 303.

[0108] In this case, as shown in Figure 21, for example, when the first rotating arm 201 rotates counterclockwise, the first rotating shaft 2211 can rotate clockwise around its own rotation center O3-O4, and also rotate clockwise along the motion trajectory T1 around the rotation center O1-O2 of the first rotating arm 201. When the first rotating shaft 2211 is positioned at the end of the first rotating arm 201 away from its rotation center O1-O2, the radius r1 of the motion trajectory T1 of the first rotating shaft 2211 is larger, making it easier for the first rotating arm 201 to drive the first rotating shaft 2211 to rotate around its rotation center O1-O2. This helps to increase the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111, making I1 ≥ 0.5. In addition, by placing the first rotating shaft 2211 at the end of the first rotating arm 201 away from the rotation center O1-O2 of the first rotating arm 201, the damage to the structure of the first rotating arm 201 caused by the first mounting hole 301 in Figure 20 can be reduced, which is beneficial to improving the rigidity of the first rotating arm 201.

[0109] Based on this, in order to limit the first rotating shaft 2211, as shown in Figure 22 (a cross-sectional view obtained by cutting along the dotted line A1-A2 in Figure 6), the shaft cover 2001 is fastened to the first opening 303 (as shown in Figure 20). The inner wall of the first mounting hole 301 can limit the first rotating shaft 2211 with the first arc surface S1 of the shaft cover 2001, so as to prevent the first rotating shaft 2211 from disengaging from the first mounting hole 301 during rotation.

[0110] Continuing with Figure 21, in some embodiments, in order to ensure that the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111 satisfies I1 > 1, the rotation radius R2 of the first gear 2111 can be smaller than the rotation radius R1 of the first rotating arm 201. In this way, the angular velocity of the first rotating arm 201 can be greater than the angular velocity of the first gear 2111, thereby making the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111 greater than 1.

[0111] Furthermore, in order to ensure that the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111 satisfies I1≥0.5, in some embodiments of this application, as shown in FIG21, the second rotating shaft 2212 in the first connecting rod 221 can be disposed at the end of the first connecting portion 21112 away from the rotation center O7-O8 of the first gear 21111. Where the internal dimensions of the rotating shaft mechanism 20 allow, the diameter of the first connecting portion 21112 can be set as large as possible.

[0112] Similarly, continuing as shown in Figure 21, for example, when the first rotating arm 201 rotates counterclockwise so that the first rotating shaft 2211 rotates counterclockwise along the motion trajectory T1 around the rotation center O1-O2 of the first rotating arm 201, the second rotating shaft 2212 can rotate clockwise around its own rotation center O5-O6, and rotate clockwise along the motion trajectory T2 around the rotation center O7-O8 of the first gear 2111 so that the first gear 2111 rotates counterclockwise. Based on this, when the second rotating shaft 2212 is located at the end of the first connecting part 21112 away from the rotation center O7-O8 of the first gear 2111, the radius r2 of the motion trajectory T2 of the second rotating shaft 2212 is larger, and the second rotating shaft 2212 is more likely to rotate around the rotation center O7-O8 of the first gear 2111, thus making it easier to drive the first gear 2111 to rotate. This is beneficial to increase the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear 2111, so that I1≥0.5.

[0113] The above is an example illustrating the rotatable connection between the first connecting rod 221 and the first rotating arm 201 and the first gear 2111. The rotatable connection between the second connecting rod 222 and the second rotating arm 202 and the second gear 2121 shown in Figure 16 can be derived similarly. For example, as shown in Figure 23 (an enlarged view of section B4 in Figure 16), the second connecting rod 222 may include a third rotating shaft 2221, a fourth rotating shaft 2222, and a second connecting shaft 2223. At least a portion of the third rotating shaft 2221 can extend into the second rotating arm 202. The way the third rotating shaft 2221 extends into the second rotating arm 202 is similar to the way the first rotating shaft 2211 extends into the first rotating arm 201, and will not be repeated here. Furthermore, the portion of the third rotating shaft 2221 extending into the second rotating arm 202 can be rotatably connected to the second rotating arm 202, so that the third rotating pair 33 (as shown in Figure 12) is formed between the third rotating shaft 2221 and the second rotating arm 202.

[0114] Furthermore, continuing as shown in Figure 23, at least a portion of the fourth rotating shaft 2222 extends into the second gear 2121. The arrangement of the fourth rotating shaft 2222 extending into the second gear 2121 is analogous to the arrangement of the second rotating shaft 2212 extending into the first gear 2111, and will not be repeated here. Moreover, the fourth rotating shaft 2222 can be rotatably connected to the second gear 2121. In this case, the fourth rotating shaft 2222 can form the aforementioned fourth rotating pair 34 with the second gear 2121 (as shown in Figure 12).

[0115] Similarly, continuing as shown in Figure 23, in order to reduce the installation clearance between the second connecting rod 222 and the second rotating arm 202, and between the second connecting rod 222 and the second gear 2121, and to reduce the loss of the transmission ratio between the second rotating arm 202 and the second connecting rod 222, and between the second gear 2121 and the second connecting rod 222, in some embodiments of this application, the second rotating arm 202 and the second gear transmission assembly (i.e., the aforementioned second gear 2121) have a second minimum transmission ratio I2, which satisfies I2≥0.5. For example, I2 can be 0.5, 0.6, 0.7, 1, or 2.

[0116] When the first rotating arm 201 and the second rotating arm 202 move synchronously, the first minimum transmission ratio I1 between the first rotating arm 201 and the first gear transmission assembly (i.e., the first gear 2111) can be the same as the second minimum transmission ratio I2 between the second rotating arm 202 and the second gear transmission assembly (i.e., the second gear 2121) (i.e., I1 = I2).

[0117] Similarly, continuing as shown in Figure 23, in order to ensure that the second minimum transmission ratio I2 between the second rotating arm 202 and the second gear 2121 satisfies I2≥0.5, the third rotating shaft 2221 of the second connecting rod 222 can be located at the end of the second rotating arm 202 away from its rotation center. Furthermore, the fourth rotating shaft 2222 of the second connecting rod 222 can be located at the end of the second gear 2121 opposite to its rotation center.

[0118] Similarly, in order to ensure that the second minimum transmission ratio I2 between the second rotating arm 202 and the second gear 2121 satisfies I2 > 1, the rotation radius of the second gear 2121 can be smaller than the rotation radius of the second rotating arm 202. In this way, the angular velocity of the second rotating arm 202 can be greater than the angular velocity of the second gear 2121, thus making the second minimum transmission ratio I2 between the second rotating arm 202 and the second gear 2121 greater than 1. Based on this, when the second minimum transmission ratio I2 is greater than 1, assuming the structural dimensions of the first rotating arm 201 and the second rotating arm 202 are the same, and the structural dimensions of the first gear 2111 and the second gear 2121 are the same, the rotation radius of the first gear 2111 and the rotation radius of any one of the gears 2121 can be smaller than the rotation radius of any one of the rotating arms 201 and 202.

[0119] As described above, the rotation centers of the first rotating arm 201 and the first gear 2111 may not coincide. Furthermore, the rotation centers of the second rotating arm 202 and the second gear 2121 may not coincide. Based on this, in some embodiments of this application, as shown in FIG24 (another cross-sectional view obtained by cutting along the dashed line A1-A2 in FIG6), when the height H1 of the main shaft 200 along the Z direction is small, the diameters of the first gear 2111 and the second gear 2121 cannot be set too large due to the limitation of height H1. On this basis, when the length L1 of the main shaft 200 along the first direction X is large, in order to enable the first rotating arm 201 and the second rotating arm 202 to move synchronously, the first gear 2111 and the second gear 2121 can be positioned between the first rotating arm 201 and the second rotating arm 202.

[0120] For example, the first gear 2111 and the second gear 2121 being positioned between the first rotating arm 201 and the second rotating arm 202 means that, within the ZX plane, the first gear 2111 and the first rotating arm 201 may not overlap, or may partially overlap. The second gear 2121 and the second rotating arm 202 may not overlap, or may partially overlap.

[0121] In this case, continuing as shown in Figure 24, along the first direction X, the first rotating arm 201, the first gear 2111, the second gear 2121, and the second rotating arm 202 can be arranged sequentially. The first rotating arm 201 and the first gear 2111, whose rotation centers do not coincide, can be rotatably connected via the first connecting rod 221. Furthermore, the second rotating arm 202 and the second gear 2121, whose rotation centers do not coincide, can be rotatably connected via the second connecting rod 222. Thus, even if the length L1 of the main shaft 200 is large, and the height H1 of the main shaft 200 along the Z direction is small, the first rotating arm 201 can still drive the second rotating arm 202 to rotate synchronously via the first connecting rod 221, the meshing first gear 2111 and second gear 2121, and the second connecting rod 222, ultimately causing the first housing 11 and the second housing 12 to move synchronously.

[0122] The above description uses the example that the first gear transmission assembly 211 may have only one first gear 2111, and the second gear transmission assembly 212 may have only one second gear 2121. In other embodiments of this application, as shown in FIG25, the first gear transmission assembly 211 may further include a third gear 2113. The third gear 2113 may be located on the side of the first gear 2111 away from the first rotating arm 201, and the third gear 2113 may mesh with the first gear 2111. Furthermore, the second gear transmission assembly 212 may further include a fourth gear 2124, which may be located on the side of the second gear 2121 away from the second rotating arm 202, and the fourth gear 2124 meshes with the second gear 2121. In addition, the fourth gear 2124 is also connected to the third gear 2113 in a transmission manner. For example, the fourth gear 2124 may directly mesh with the third gear 2113.

[0123] Similarly, as shown in Figure 26 (another sectional view obtained by cutting along the dashed line A1-A2 in Figure 6), along the first direction X, the first rotating arm 201, the first gear 2111, the third gear 2113, the fourth gear 2124, the second gear 2121, and the second rotating arm 202 can be arranged sequentially. The first rotating arm 201 and the first gear 2111, whose rotation centers do not coincide, can be rotatably connected via the first connecting rod 221. Furthermore, the second rotating arm 202 and the second gear 2121, whose rotation centers do not coincide, can be rotatably connected via the second connecting rod 222. In this way, even if the length L1 of the main shaft 200 is further increased, the first rotating arm 201 can still drive the second rotating arm 202 to rotate synchronously through the first connecting rod 221, the meshing first gear 2111, the third gear 2113, the fourth gear 2124 and the second gear 2121, and the second connecting rod 222, ultimately causing the first housing 11 and the second housing 12 to move synchronously.

[0124] The above example illustrates the direct meshing of the fourth gear 2124 and the third gear 2113. In other embodiments of this application, at least one of the transmission components in the first gear transmission assembly 211 and the second gear transmission assembly 212 may further include other gears located between the fourth gear 2124 and the third gear 2113, so that the fourth gear 2124 can be indirectly connected to the third gear 2113 through other gears.

[0125] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A swivel mechanism (20), characterized in that include: Spindle (200); A first rotating arm (201) is partially located inside the main shaft (200), and the first rotating arm (201) is rotatably connected to the main shaft (200) about a first direction (Y); the first direction (Y) is the extension direction of the main shaft (200); The second rotating arm (202) is located along the second direction (X), with the first rotating arm (201) and the second rotating arm (202) respectively located on both sides of the main shaft (200); a portion of the second rotating arm (202) is located inside the main shaft (200), and the second rotating arm (202) is rotatably connected to the main shaft (200) about the first direction (Y); the second direction (X) is perpendicular to the first direction (Y); The first gear transmission assembly (211) is located inside the main shaft (200) and is disposed between the first rotating arm (201) and the second rotating arm (202); The second gear transmission assembly (212) is located inside the main shaft (200) and is connected to the first gear transmission assembly (211) in a transmission manner; the second gear transmission assembly (212) is disposed between the first rotating arm (201) and the second rotating arm (202); The first connecting rod (221) is located inside the main shaft (200), and the first connecting rod (221) is disposed between the first rotating arm (201) and the first gear transmission assembly (211). The first connecting rod (221) is rotatably connected to the first rotating arm (201) and the first gear transmission assembly (211). The second link (222) is located inside the main shaft (200) and is disposed between the second rotating arm (202) and the second gear transmission assembly (212). The second link (222) is rotatably connected to the second rotating arm (202) and the second gear transmission assembly (212).

2. The rotating shaft mechanism (20) according to claim 1, characterized in that, The first gear transmission assembly (211) includes a first gear (2111), which is rotatably connected to the first connecting rod (221); The second gear transmission assembly (212) includes a second gear (2121), which is rotatably connected to the second connecting rod (222); The first link (221) includes: The first rotating shaft (2211) extends at least partly into the first rotating arm (201) and is rotatably connected to the first rotating arm (201); The second rotating shaft (2212) extends at least partly into the first gear (2111) and is rotatably connected to the first gear (2111); wherein the extending direction of the first rotating shaft (2211) and the extending direction of the second rotating shaft (2212) do not coincide. A first connecting shaft (2213) is located between the first rotating shaft (2211) and the second rotating shaft (2212), with both ends of the first connecting shaft (2213) connected to the first rotating shaft (2211) and the second rotating shaft (2212) respectively.

3. The rotating shaft mechanism (20) according to claim 2, characterized in that, The main shaft (200) includes a shaft cover (2001) and a shaft seat (2002); the shaft cover (2001) is fastened to the shaft seat (2002); the surface of the shaft cover (2001) facing the shaft seat (2002) has a recessed first arc surface (S1), and the surface of the shaft seat (2002) facing the shaft cover (2001) has a raised second arc surface (S2); The first rotating arm (201) includes a first arc arm (2012), which is located between the shaft cover (2001) and the shaft seat (2002); the first arc arm (2012) has a third arc surface (S3) and a fourth arc surface (S4); the third arc surface (S3) is rotatably engaged with the first arc surface (S1), and the fourth arc surface (S4) is rotatably engaged with the second arc surface (S2); The first rotating shaft (2211) is disposed at one end of the first rotating arm (201) facing the shaft cover (2001), relative to the bearing seat (2002).

4. The rotating shaft mechanism (20) according to claim 3, characterized in that, The first rotating arm (201) has a first mounting hole (301) at one end facing the first rotating shaft (2211), and a part of the first rotating shaft (2211) is located in the first mounting hole (301); The third arc surface (S3) has a first opening (303); the first opening (303) is connected to the first mounting hole (301); the shaft cover (2001) is fastened to the first opening (303), and the inner wall of the first mounting hole (301) and the first arc surface (S1) limit the first rotating shaft (2211).

5. The rotating shaft mechanism (20) according to any one of claims 2-4, characterized in that, The first gear (2111) includes: First gear body (21110); The first connecting part (21112) is disposed on the side of the first gear body (21110) facing the first rotating arm (201); the second rotating shaft (2212) extends into the first connecting part (21112); The second rotating shaft (2212) is located at one end of the first connecting part (21112) away from the rotation center of the first gear (2111).

6. The rotating shaft mechanism (20) according to any one of claims 2-5, characterized in that, The first gear (2111) and the second gear (2121) are located between the first rotating arm (201) and the second rotating arm (202).

7. The rotating shaft mechanism (20) according to any one of claims 1-6, characterized in that, The first gear transmission assembly (211) further includes a third gear (2113), which is located on the side of the first gear (2111) away from the first rotating arm (201); the third gear (2113) meshes with the first gear (2111); The second gear transmission assembly (212) further includes a fourth gear (2124), which is located on the side of the second gear (2121) away from the second rotating arm (202); the fourth gear (2124) meshes with the second gear (2121) and is connected to the third gear (2113) in a transmission connection.

8. The rotating shaft mechanism (20) according to any one of claims 1-7, characterized in that, The first rotating arm (201) and the first gear transmission assembly (211) have a first minimum transmission ratio I1, where I1 ≥ 0.5; The second rotating arm (202) and the second gear transmission assembly (212) have a second minimum transmission ratio I2, where I2 ≥ 0.5; Where I1 = I2.

9. The rotating shaft mechanism (20) according to claim 8, characterized in that, The rotation radius of either the first gear (2111) or the second gear (2121) is smaller than the rotation radius of either the first rotating arm (201) or the second rotating arm (202).

10. A display terminal (01), characterized by include: Display screen (10); First shell (11); Second shell (12); The rotating shaft mechanism (20) as described in any one of claims 1-9; the rotating shaft mechanism (20) is located between the first housing (11) and the second housing (12), and the display screen (10) is connected to the first housing (11) and the second housing (12); the display screen (10) covers the rotating shaft mechanism (20).

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