Rotating mechanism and foldable electronic device

Abstract

Provided are a rotating mechanism and a foldable electronic device. The rotating mechanism comprises a bearing base (400), a first connecting shaft (30), a second connecting shaft (40), a first synchronous swing arm (10), a second synchronous swing arm (20) and a synchronous sliding block (50), wherein the first synchronous swing arm is integrally formed, and comprises a first rotating portion (12), which is provided with two helical surfaces (121); the second synchronous swing arm comprises a second rotating portion (22), which is provided with two helical surfaces (221); and the synchronous sliding block comprises a first synchronous member (51) and a second synchronous member (51A), the first synchronous member being provided with two mating helical surfaces (50A), the second synchronous member being provided with two mating helical surfaces (50B), and the two helical surfaces each abutting against the corresponding two mating helical surfaces. The foldable electronic device comprises a first housing (210), a second housing (220) and the rotating mechanism.

Description

Rotating mechanism and foldable electronic device Technical Field

[0001] The present application relates to the technical field of foldable electronic devices, and in particular to a rotating mechanism and a foldable electronic device. Background Art

[0002] With the advancement of technology, various electronic devices have become indispensable in daily life and production. Foldable electronic devices, with their large display area and portability, have become a growing trend. Current foldable electronic devices primarily rely on a rotating mechanism to achieve folding and unfolding. Conventional rotating mechanisms employ multiple gears to achieve synchronized movement during the folding process.

[0003] However, current rotation mechanisms have numerous components, such as synchronous gears. As foldable electronic devices become thinner and lighter, the space left for these gears is very small, resulting in a lack of structural strength. This, in turn, affects the gear's lifespan and leads to poor synchronization during the folding and unfolding of the foldable electronic device. Furthermore, the large number of synchronized components complicates the assembly process.

[0004] Summary of the Invention

[0005] The present application provides a rotating mechanism and a foldable electronic device, wherein the structural strength of the synchronizer is relatively strong, the number of parts is relatively small, and the assembly process is simple.

[0006] A first aspect of the present application provides a rotating mechanism, comprising: a bearing base, a first connecting shaft, a second connecting shaft, a first synchronous swing arm, a second synchronous swing arm and a synchronous slider.

[0007] The first and second connecting shafts are both fixed to the support base and are arranged parallel to and spaced apart from each other along the width of the support base. The first synchronous swing arm includes a first rotating portion, and the second synchronous swing arm includes a second rotating portion. The synchronous slider includes a first synchronizer and a second synchronizer that are fixedly connected.

[0008] The first rotating portion and the second rotating portion are respectively sleeved on the first connecting shaft and the second connecting shaft, and the first rotating portion and the second rotating portion are arranged side by side along the width direction of the support base, the first rotating portion can rotate around the first connecting shaft, and the second rotating portion can rotate around the second connecting shaft. The first synchronizer and the second synchronizer are respectively sleeved on the first connecting shaft and the second connecting shaft, and the first synchronizer and the second synchronizer are arranged side by side along the width direction of the support base, the first synchronizer can slide along the axial direction of the first connecting shaft, and the second synchronizer can slide along the axial direction of the second connecting shaft.

[0009] The first rotating portion is provided with two helical surfaces spaced apart and opposed to each other along the length of the support base, and the first synchronizer is provided with two mating helical surfaces facing away from each other along the length of the support base. Along the length of the support base, the first synchronizer is located between the two helical surfaces of the first rotating portion, and the two mating helical surfaces of the first synchronizer respectively abut the two helical surfaces of the first rotating portion.

[0010] The second rotating portion is provided with two helical surfaces spaced apart and opposed to each other along the length of the supporting base, and the second synchronizer is provided with two mating helical surfaces facing away from each other along the length of the supporting base. Along the length of the supporting base, the second synchronizer is located between the two helical surfaces of the second rotating portion, and the two mating helical surfaces of the second synchronizer respectively abut the two helical surfaces of the second rotating portion.

[0011] The rotation mechanism is used in foldable electronic devices, such as foldable phones. The foldable electronic device includes a first housing and a second housing. The first synchronous swing arm of the rotation mechanism is connected to the first housing via a first fixing plate, and the second synchronous swing arm is connected to the second housing via a second fixing plate. The rotation mechanism allows the first and second housings to be folded or unfolded synchronously, allowing the display of the foldable electronic device to be unfolded or unfolded. When unfolded, the display has a larger display surface, while when folded, the display is easily stored.

[0012] When the rotation mechanism realizes the synchronization of the first shell and the second shell, when the first shell rotates, it can drive the second shell to rotate synchronously. Similarly, when the second shell rotates, it can drive the first shell to rotate synchronously to achieve the synchronization of the rotation of the first shell and the second shell. The following takes the example of the first shell rotating and driving the second shell to rotate synchronously to describe the process of the rotation mechanism causing the first shell and the second shell to rotate synchronously: the user can apply force to the first shell, and the first shell drives the first fixed plate to rotate relative to the supporting base, so that the first synchronous swing arm slides relative to the first fixed plate. At the same time, the first rotating part rotates around the first connecting shaft, so that the two helical surfaces of the first rotating part rotate along the two matching helical surfaces of the first synchronizer, so that the first synchronizer slides along the axial direction of the first connecting shaft.

[0013] The first synchronizer and the second synchronizer are fixedly connected. Therefore, when the first synchronizer slides along the axial direction of the first connecting shaft, the second synchronizer slides along the axial direction of the second connecting shaft, so that the two matching helical surfaces of the second synchronizer push the two helical surfaces of the second rotating part, and the two helical surfaces of the second rotating part rotate along the two matching helical surfaces of the second synchronizer, so that the second rotating part rotates around the second connecting shaft, and then the second synchronous swing arm drives the second fixed plate to rotate, and the second fixed plate drives the second housing and the first housing to rotate synchronously.

[0014] In the related art, multiple gear transmissions are used to achieve synchronous rotation of the first and second synchronous swing arms, and thus the first and second fixed plates. However, due to the increasing demand for lightweight and thin foldable electronic devices, the space reserved for gears is very small, and the gears are designed to be small. However, if the gears are too small, the structural strength of the gear teeth will be difficult to ensure, which will in turn affect the gear life and lead to poor synchronization during the folding and unfolding of the foldable electronic device.

[0015] In this embodiment, a spiral structure is used to achieve synchronous transmission, and the two helical surfaces of the first rotating part respectively cooperate with the two matching helical surfaces of the first synchronizer. The cooperation here means that the two helical surfaces of the first rotating part respectively abut against the two matching helical surfaces of the first synchronizer, and the two helical surfaces of the first rotating part can rotate along the two matching helical surfaces of the first synchronizer, so that the first synchronizer can slide axially along the first connecting shaft. The two helical surfaces of the second rotating part cooperate with the two matching helical surfaces of the second synchronizer. Compared with the serrations of the gears in the prior art, the size of the spiral structure is larger and it is an integral structure, so the strength of the spiral structure is significantly enhanced. Thereby, the overall structural strength of the synchronization component can be increased, the service life of the synchronization component can be extended, and the foldable electronic device has good synchronization during folding and unfolding.

[0016] Furthermore, in related art, the first synchronous swing arm is manufactured in two parts, which are then assembled in a removable manner after being independently processed. This structural approach results in a complex synchronous assembly, a large number of parts, and a cumbersome assembly process. In this embodiment, the first synchronous swing arm is integrally formed, simplifying the structure of the synchronous assembly, reducing the number of parts, and improving assembly convenience and efficiency.

[0017] In some embodiments, the first rotating portion includes a first rotating member and a second rotating member, which are spaced apart along the length of the rotating mechanism. The first rotating member defines a first rotating hole, and the second rotating member defines a second rotating hole. The first synchronizing member defines a first through hole, which extends through the first synchronizing member along the length of the supporting base.

[0018] The first synchronous member is arranged in the interval between the first rotating member and the second rotating member, the first rotating hole, the first through hole and the second rotating hole are coaxial, and the first connecting shaft passes through the first rotating hole, the first through hole and the second rotating hole in sequence, so that the first rotating member, the first synchronous member and the second rotating member are sequentially sleeved on the first connecting shaft.

[0019] The two mating helical surfaces of the first synchronizer include a first mating surface and a second mating surface, which are arranged at opposite ends of the first synchronizer along the length direction; the first mating surface and the second mating surface both extend axially around the first through hole. The two helical surfaces of the first rotating part include a first helical surface and a second helical surface; the first helical surface is arranged at the end of the first rotating part, and the first helical surface extends axially around the first rotating hole; the second helical surface is arranged at the end of the second rotating part, and the second helical surface extends axially around the second rotating hole. The two ends of the first synchronizer are respectively opposite to one end of the first rotating part and one end of the second rotating part, so that the first helical surface abuts the first mating surface, and the second helical surface abuts the second mating surface. When the rotating mechanism realizes the synchronous action, the first helical surface rotates along the first mating surface, and the second helical surface rotates along the second mating surface.

[0020] In this embodiment, the first helical surface is completely located at the end of the first rotating member and does not extend into the interior of the first rotating hole, so that the aperture of the first rotating hole along its axial direction remains unchanged. The second helical surface is completely located at the end of the second rotating member and does not extend into the interior of the second rotating hole, so that the aperture of the second rotating hole along its axial direction remains unchanged. This makes the structures of the first rotating member and the second rotating member simple and can be processed using a mold, that is, the first synchronous swing arm can be processed using a mold, which improves processing efficiency. Similarly, the first mating surface and the second mating surface are provided at opposite ends of the first synchronous member along the length direction; they do not extend into the interior of the first through hole. This makes the first synchronous member able to be processed using a mold, which improves processing efficiency.

[0021] In some embodiments, the second synchronous swing arm is integrally formed, which further simplifies the structure of the synchronous assembly, reduces the number of parts of the synchronous assembly, improves assembly convenience, and improves assembly efficiency.

[0022] In some embodiments, the second rotating portion includes a third rotating member and a fourth rotating member, which are spaced apart along the length of the rotating mechanism. The third rotating member defines a third rotating hole, and the fourth rotating member defines a fourth rotating hole. The second synchronizing member defines a second through hole, which extends through the second synchronizing member along the length of the supporting base.

[0023] The second synchronous member is arranged in the interval between the third rotating member and the fourth rotating member. The third rotating hole, the second through hole and the fourth rotating hole are coaxial. The second connecting shaft passes through the third rotating hole, the second through hole and the fourth rotating hole in sequence, so that the third rotating member, the second synchronous member and the fourth rotating member are sequentially sleeved on the second connecting shaft.

[0024] The two mating helical surfaces of the second synchronizer include a third mating surface and a fourth mating surface, which are located at opposite ends of the second synchronizer along its length; both the third mating surface and the fourth mating surface extend axially around the second through hole. The two helical surfaces of the second rotating portion include a third helical surface and a fourth helical surface; the third helical surface is located at the end of the third rotating portion and extends axially around the first rotating hole; the fourth helical surface is located at the end of the fourth rotating portion and extends axially around the fourth rotating hole.

[0025] The two ends of the second synchronizer are respectively opposite to one end of the third rotating member and one end of the fourth rotating member, so that the third helical surface abuts the third mating surface, and the fourth helical surface abuts the fourth mating surface. When the rotating mechanism achieves synchronization, the third helical surface rotates along the third mating surface, and the fourth helical surface rotates along the fourth mating surface.

[0026] The third helical surface is completely located at the end of the third rotating member and does not extend into the interior of the third rotating hole, so that the aperture of the third rotating hole along its axial direction remains unchanged. The fourth helical surface is completely located at the end of the fourth rotating member and does not extend into the interior of the fourth rotating hole, so that the aperture of the fourth rotating hole along its axial direction remains unchanged. The third rotating member and the fourth rotating member can be processed using a mold, that is, the second synchronous swing arm can be processed using a mold, thereby improving processing efficiency. Similarly, the third mating surface and the fourth mating surface are provided at opposite ends of the second synchronous member along the length direction and do not extend into the interior of the second through hole. The second synchronous member can be processed using a mold, thereby improving processing efficiency.

[0027] In some embodiments, the first helical surface is provided with a first protrusion, and the first mating surface abuts the first protrusion. This reduces the contact area between the first rotating member and the first synchronizer, thereby reducing friction between the first rotating member and the first synchronizer during the state switching process of the rotating mechanism.

[0028] In some other embodiments, a first protrusion is provided on the first mating surface, and the first protrusion abuts against the first spiral surface.

[0029] Similarly, the second helical surface or the second mating surface can be provided with a second protrusion to reduce the friction between the second rotating member and the first synchronizer. Ultimately, this reduces the friction between the first synchronizer swing arm and the synchronizer slider, allowing the synchronizer assembly to operate more smoothly. The third helical surface or the third mating surface can be provided with a third protrusion to reduce the friction between the third rotating member and the second synchronizer. The fourth helical surface or the fourth mating surface can be provided with a fourth protrusion to reduce the friction between the fourth rotating member and the second synchronizer. Ultimately, this reduces the friction between the second synchronizer swing arm and the synchronizer slider, allowing the synchronizer assembly to operate more smoothly.

[0030] In some embodiments, there are multiple first protrusions. When the first protrusion is provided on the first helical surface, the multiple first protrusions are spaced apart along the extension direction of the first helical surface; when the first protrusion is provided on the first mating surface, the multiple first protrusions are spaced apart along the extension direction of the first mating surface. This can further reduce the contact area between the first rotating member and the first synchronizer, thereby further reducing the friction between the first rotating member and the first synchronizer. Similarly, the shape and number of the second, third, and fourth protrusions can refer to the first protrusion.

[0031] In some embodiments, the first protrusion is elongated. When the first protrusion is provided on the first helical surface, the extension direction of the first protrusion is the same as the extension direction of the first helical surface; when the first protrusion is provided on the first mating surface, the extension direction of the first protrusion is the same as the extension direction of the first mating surface. In this case, the first protrusion can serve the dual purpose of guiding and reducing friction, allowing the synchronizer assembly to operate more smoothly and with greater stability.

[0032] In some embodiments, the first rotating portion includes a first rotating member, and the second rotating portion includes a third rotating member; the first rotating member includes a first outer peripheral surface, the first outer peripheral surface being provided with a first synchronous tooth; the third rotating member includes a third outer peripheral surface, the third outer peripheral surface being provided with a third synchronous tooth; the first rotating member is rotatably connected to the first connecting shaft, and the third rotating member is rotatably connected to the second connecting shaft; the first rotating member and the third rotating member are arranged along the width direction, and the first synchronous tooth engages with the third synchronous tooth. The first synchronous tooth and the third synchronous tooth cooperate with each other to increase the synchronization of the rotation of the first synchronous swing arm and the second synchronous swing arm, thereby increasing the synchronization of the rotation of the first fixed plate and the second fixed plate.

[0033] In some embodiments, the first rotating portion further includes a second rotating member, and the second rotating portion further includes a fourth rotating member; the second rotating member includes a second outer peripheral surface, the second outer peripheral surface being provided with a second synchronous tooth; the fourth rotating member includes a fourth outer peripheral surface, the fourth peripheral surface being provided with a fourth synchronous tooth; the second rotating member is rotatably connected to the first connecting shaft, and the fourth rotating member is rotatably connected to the second connecting shaft; the second rotating member and the fourth rotating member are arranged along the width direction, and the second synchronous tooth engages with the fourth synchronous tooth. The first synchronous tooth and the third synchronous tooth cooperate with each other, and the second synchronous tooth and the fourth synchronous tooth cooperate with each other. In addition, the first synchronous tooth and the second synchronous tooth are symmetrical about the first synchronous member, and the third synchronous tooth and the fourth synchronous tooth are symmetrical about the second synchronous member, so that the operation of the synchronization assembly is more stable and the synchronization is better.

[0034] In some embodiments, the rotating mechanism also includes a first fixed plate and a second fixed plate; the first fixed plate and the second fixed plate are respectively located on opposite sides of the supporting base along the width direction of the rotating mechanism; the first synchronous swing arm also includes a first swing arm, and the second synchronous swing arm also includes a second swing arm; along the width direction, the first swing arm and the first rotating part are fixedly connected, and the second swing arm and the second rotating part are fixedly connected; the first swing arm slides and rotates to connect to the first fixed plate, and the second swing arm slides and rotates to connect to the second fixed plate; the first fixed plate rotates around the supporting base, so that the first swing arm rotates around the supporting base, the first rotating part rotates around the first connecting axis, the two helical surfaces of the first rotating part rotate along the two matching helical surfaces of the first synchronous part, the first synchronous part slides along the first connecting axis, the second synchronous part slides along the second connecting axis, and the two helical surfaces of the second rotating part rotate along the two matching helical surfaces of the second synchronous part, so that the second fixed plate and the first fixed plate rotate synchronously.

[0035] In some embodiments, the rotating mechanism is applied to an outward-folding mobile phone; the rotation angles of the first synchronous swing arm and the second synchronous swing arm are both less than 90 degrees.

[0036] A second aspect of the present application provides a foldable electronic device, comprising a first shell, a second shell and the rotating mechanism of any one of the first aspects of the present application; the rotating mechanism is connected between the first shell and the second shell.

[0037] In some embodiments, the electronic device also includes a display screen, which includes a first display part, a second display part and a third display part, and the third display part is connected between the first display part and the second display part; the first display part is arranged in the first shell, the second display part is arranged in the second shell, and the third display part is arranged in the rotating mechanism; when the foldable electronic device is in a folded state, the first shell and the second shell are stacked along the thickness of the foldable electronic device, the first display part is located on the side of the first shell facing away from the second shell, and the second display part is located on the side of the second shell facing away from the first shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0039] FIG1 is a schematic structural diagram of a foldable electronic device in a first state provided by an embodiment of the present application.

[0040] FIG2 is a schematic diagram of the split structure of the foldable electronic device provided in an embodiment of the present application in the second state.

[0041] FIG3 is a schematic structural diagram of the rotation mechanism provided in an embodiment of the present application.

[0042] FIG4 is a schematic diagram of the split structure of the rotating mechanism shown in FIG3 .

[0043] FIG. 5 is a schematic diagram of a portion of the structure of the supporting base of the rotating mechanism shown in FIG. 4 .

[0044] FIG. 6 is a partial structural diagram of the first fixing plate of the rotating mechanism shown in FIG. 4 .

[0045] FIG. 7 is a partial structural diagram of the second fixing plate of the rotating mechanism shown in FIG. 4 .

[0046] FIG8 is a schematic structural diagram of a synchronization component of the rotating mechanism shown in FIG4 .

[0047] FIG9 is a schematic diagram of the split structure of the synchronization component shown in FIG8 .

[0048] FIG10 is a schematic diagram of a partial structure of the rotating mechanism shown in FIG4 .

[0049] FIG11 is a schematic structural diagram of the first synchronous swing arm of the synchronous assembly shown in FIG9 .

[0050] FIG12 is a schematic structural diagram of the first synchronous swing arm shown in FIG11 from another perspective.

[0051] FIG13 is a schematic structural diagram of the second synchronous swing arm of the synchronous assembly shown in FIG9 .

[0052] FIG14 is a schematic structural diagram of the second synchronous swing arm shown in FIG12 from another perspective.

[0053] FIG15 is a schematic structural diagram of a synchronization slider of the synchronization assembly shown in FIG9 .

[0054] FIG. 16 is a schematic structural diagram of the synchronization slider shown in FIG. 15 from another perspective.

[0055] FIG17 is a schematic diagram of a partial structure of the rotating mechanism shown in FIG3 .

[0056] FIG18 is a schematic diagram of the assembly process of the synchronization component shown in FIG8 .

[0057] FIG19 is an enlarged structural diagram of point A in FIG17 .

[0058] Figure 20 is a structural diagram of the synchronization component provided by an embodiment of the present application in an expanded state from another perspective.

[0059] FIG21 is a schematic diagram of the intermediate process of the rotating mechanism provided in an embodiment of the present application switching from the unfolded state to the folded state.

[0060] FIG22 is a schematic structural diagram of the rotating mechanism provided in an embodiment of the present application in a folded state.

[0061] Figure 23 is a structural diagram of the synchronization component provided in an embodiment of the present application in a folded state.

[0062] Figure 24 is another structural schematic diagram of the synchronization component provided by an embodiment of the present application in a folded state.

[0063] FIG25 is a structural diagram of the synchronization component provided in an embodiment of the present application in a folded state from another perspective.

[0064] Figure 26 is a structural schematic diagram of the foldable electronic device provided in an embodiment of the present application in a folded state.

[0065] FIG27 is a schematic structural diagram of a foldable electronic device in a folded state in the related art.

[0066] FIG28 is a schematic structural diagram of a synchronization component provided in another embodiment of the present application.

[0067] FIG29 is a schematic structural diagram of a synchronization component provided in yet another embodiment of the present application.

[0068] FIG30 is a schematic structural diagram of the synchronization slider of the synchronization assembly shown in FIG29.

[0069] FIG31 is a schematic structural diagram of another embodiment of the synchronization slider of the synchronization assembly shown in FIG29. DETAILED DESCRIPTION

[0070] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0071] Please refer to Figures 1 and 2. Figure 1 is a structural schematic diagram of the foldable electronic device 1000 provided in an embodiment of the present application in a first state, and Figure 2 is a structural schematic diagram of the foldable electronic device 1000 provided in an embodiment of the present application in a second state.

[0072] The foldable electronic device 1000 shown in FIG1 is in a folded state, and the foldable electronic device 1000 shown in FIG2 is in an unfolded state. The unfolding angle of the foldable electronic device 1000 shown in FIG2 is 180 degrees. The foldable electronic device 1000 includes, but is not limited to, a cell phone, a notebook computer, a tablet personal computer, a personal digital assistant, a wearable device, or a mobile device, etc. In the embodiment of the present application, the foldable electronic device 1000 is an external folding mobile phone as an example for description. An external folding mobile phone is a mobile phone whose display screen is on the outside after folding.

[0073] It should be noted that the angles illustrated in the embodiments of this application are all allowed to have slight deviations. For example, the unfolded angle of the foldable electronic device 1000 shown in Figure 2 is 180 degrees, and the deviation can be ±5 degrees. The angles illustrated in the examples below should be understood in the same way.

[0074] For ease of description, the width direction of the foldable electronic device 1000 is defined as the X-axis direction, the length direction of the foldable electronic device 1000 is defined as the Y-axis direction, and the thickness direction of the foldable electronic device 1000 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0075] The foldable electronic device 1000 includes a main body 200 and a display screen 300, which is mounted on the main body 200. The display screen 300 is a flexible screen and includes a display surface and a mounting surface, which are arranged opposite each other. The display surface is used to display text, images, and videos. The display screen 300 includes a first display portion 310, a second display portion 320, and a third display portion 330. The third display portion 330 is located between the first display portion 310 and the second display portion 320.

[0076] The main body 200 includes a first housing 210, a second housing 220, and a rotation mechanism 100. The first housing 210 is provided with a first receiving slot (not shown), and the second housing 220 is provided with a second receiving slot (not shown). The first receiving slot and the second receiving slot are connected to form a receiving slot. The rotation mechanism 100 is mounted in the receiving slot to achieve a rotational connection between the first housing 210 and the second housing 220. The first housing 210 and the second housing 220 can rotate relative to each other via the rotation mechanism 100, allowing the main body 200 to switch between a folded state and an unfolded state.

[0077] The display screen 300 is mounted on the main body 200, with the mounting surface fixedly connected to the main body 200. Specifically, the first display portion 310 is mounted on the first housing 210, and the second display portion 320 is mounted on the second housing 220. The rotation mechanism 100 and the third display portion 330 are arranged opposite each other to achieve bending of the display screen 300. The width of the third display portion 330 along the X-axis can be greater than or equal to the width of the rotation mechanism 100. The side of the first and second housings 210, 220 facing away from the display screen 300 is the inner side of the electronic device, while the side supporting the display screen 300 is the outer side.

[0078] It should be noted that the directional terms such as "top", "bottom", "left", "right", "front" and "back" used in the embodiment of the present application to describe the foldable electronic device 1000 are mainly explained based on the display orientation of the foldable electronic device 1000 in Figures 2 and 5, with the direction facing the positive direction of the Z axis as "top" and "up", the direction facing the negative direction of the Z axis as "bottom" and "back", the direction facing the positive direction of the X axis as "right", the direction facing the negative direction of the X axis as "left", the direction facing the positive direction of the Y axis as "back", and the direction facing the negative direction of the Y axis as "front". It does not constitute a limitation on the orientation of the foldable electronic device 1000 in actual application scenarios.

[0079] The rotating mechanism 100 enables the main body 200 to switch between a folded state and an unfolded state. Specifically, the rotating mechanism 100 also has a folded state and an unfolded state. When the rotating mechanism 100 is in the folded state, the mobile phone is in the folded state. At this time, the first shell 210 and the second shell 220 are stacked along the Z-axis direction. The first display unit 310 is located on the outside of the first shell 210. The outside of the first shell 210 is the side of the first shell 210 facing away from the second shell 220. The second display unit 320 is located on the outside of the second shell 220. The outside of the second shell 220 is the side of the second shell 220 facing away from the first shell 210. When the rotating mechanism 100 is in the unfolded state, the mobile phone is in the unfolded state. At this time, the first shell 210 and the second shell 220 are arranged along the X-axis direction.

[0080] Please refer to Figures 3 and 4. Figure 3 is a structural diagram of the rotating mechanism 100 provided in an embodiment of the present application, and Figure 4 is a schematic diagram of the split structure of the rotating mechanism shown in Figure 3.

[0081] In this embodiment, the rotation mechanism 100 includes a supporting base 400, a first fixing plate 500, a second fixing plate 600, and a synchronization assembly 110. The first fixing plate 500 and the second fixing plate 600 are located on opposite sides of the supporting base 400 along the X-axis. The synchronization assembly 110 is mounted on the supporting base 400 and connected to the first fixing plate 500 and the second fixing plate 600, respectively. The synchronization assembly 110 causes the first fixing plate 500 and the second fixing plate 600 to rotate synchronously about the supporting base 400. In the rotation mechanism 100, the first fixing plate 500 is fixed to the first housing 210, and the second fixing plate 600 is fixed to the second housing 220. Therefore, when the first fixing plate 500 and the second fixing plate 600 rotate about the supporting base 400, the first housing 210 and the first fixing plate 500 move synchronously, and the second housing 220 and the second fixing plate 600 move synchronously, thereby enabling the mobile phone to switch between an unfolded state and a folded state.

[0082] There may be two synchronization assemblies 110, which are installed on the support base 400 at intervals along the Y-axis. Specifically, one synchronization assembly 110 is installed on the front side of the support base 400, and the other synchronization assembly 110 is installed on the rear side of the support base 400. In other embodiments, there may be one, three, four, or five synchronization assemblies 110, etc.

[0083] Please refer to Figure 5, which is a schematic diagram of a portion of the supporting base 400 of the rotating mechanism 100 shown in Figure 4. Figure 5 illustrates the front portion of the supporting base 400. The supporting base 400 has a rectangular outer contour, with its length parallel to the Y-axis, its width parallel to the X-axis, and its thickness parallel to the Z-axis. It includes a top supporting surface 401, a bottom supporting surface 402, a first supporting side surface 403, and a second supporting side surface 404. The top supporting surface 401 and the bottom supporting surface 402 face opposite each other along the Z-axis, while the first supporting side surface 403 and the second supporting side surface 404 face opposite each other along the X-axis. The first supporting side surface 403 connects between the top supporting surface 401 and the bottom supporting surface 402 on one side, and the second supporting side surface 404 connects between the top supporting surface 401 and the bottom supporting surface 402 on the other side. The bottom supporting surface 402 can be curved to better support the display screen 300. The shape of the supporting bottom surface 402 in FIG. 5 is merely exemplary.

[0084] A mounting slot 405 is provided on each of the front and rear sides of the support base 400. The mounting slot 405 is formed by recessing the support top surface 401 toward the support bottom surface 402 and extending through the first support side surface 403 and the second support side surface 404. The mounting slot 405 includes a first slot surface 406 and a second slot surface 407, which are spaced apart and opposed to each other along the Y-axis. The first slot surface 406 is recessed with a first mounting hole 408 and a second mounting hole 409, which are spaced apart and coaxially arranged along the X-axis. The second slot surface 407 is recessed with a third mounting hole (not shown) and a fourth mounting hole (not shown). The third and fourth mounting holes are spaced apart and coaxially arranged along the X-axis. The mounting slot 405 is used to mount the synchronization assembly 110.

[0085] Please refer to Figure 6, which is a schematic diagram of a portion of the first fixing plate 500 of the rotating mechanism 100 shown in Figure 4. Figure 6 illustrates the front portion of the first fixing plate 500. The outer contour of the first fixing plate 500 is a rectangular parallelepiped, with the length of the first fixing plate 500 parallel to the Y-axis. The first fixing plate 500 includes a first top surface 501, a first bottom surface 502, a first side surface 503, and a second side surface 504. The first top surface 501 and the first bottom surface 502 are disposed opposite to each other along the Z-axis, and the first side surface 503 and the second side surface 504 are disposed opposite to each other along the X-axis.

[0086] The first fixed plate 500 is provided with a first synchronous slide 505. The first synchronous slide 505 is formed by the first top surface 501 being recessed toward the first bottom surface 502. The first synchronous slide 505 includes a first opening and a second opening. The first opening is provided on the first side surface 503, and the second opening is provided on the second side surface 504. The first synchronous slide 505 includes a first groove side surface 506 and a second groove side surface 507. Along the Y-axis direction, the first groove side surface 506 and the second groove side surface 507 are opposite to each other. The first groove side surface 506 is provided with a first limiting portion 508, and the second groove side surface 507 is provided with a second limiting portion 509. The first synchronous slide 505 is used to connect with the synchronization assembly 110. In other embodiments, the first synchronous slide 505 can also be of other structural forms, as long as the first synchronous slide 505 and the synchronization assembly 110 can be connected. This is not limited in this application.

[0087] Please refer to Figure 7, which is a schematic diagram of a partial structure of the second fixed plate 600 of the rotating mechanism 100 shown in Figure 4. Figure 7 illustrates the front side of the second fixed plate 600. The structure of the second fixed plate 600 is basically the same as that of the first fixed plate 500. The outer contour of the first fixed plate 500 is rectangular, and the length direction of the first fixed plate 500 is parallel to the Y-axis direction. The first fixed plate 500 includes a second top surface 601, a second bottom surface 602, a third side surface 603 and a fourth side surface 604. The second top surface 601 and the second bottom surface 602 are arranged opposite to each other along the Z-axis direction, and the third side surface 603 and the fourth side surface 604 are arranged opposite to each other along the X-axis direction.

[0088] The second fixed plate 600 is provided with a second synchronization slot 605. The second synchronization slot 605 is formed by the second top surface 601 being recessed toward the second bottom surface 602. The second synchronization slot 605 includes a third opening and a fourth opening. The third opening is provided on the third side surface 603, and the fourth opening is provided on the fourth side surface 604. The second synchronization slot 605 includes a third slot side surface 606 and a fourth slot side surface 607. Along the Y-axis direction, the third slot side surface 606 and the fourth slot side surface 607 are opposite to each other. The third slot side surface 606 is provided with a third limiting portion 608, and the fourth slot side surface 607 is provided with a fourth limiting portion 609. The second synchronization slot 605 is used to connect to the synchronization assembly 110. In other embodiments, the second synchronization slot 605 can also have other structural forms, as long as the second synchronization slot 605 and the synchronization assembly 110 can be connected. This is not limited in this application.

[0089] Please refer to Figures 8 and 9. Figure 8 is a schematic diagram of the structure of the synchronization assembly 110 of the rotating mechanism 100 shown in Figure 4, and Figure 9 is a schematic diagram of the split structure of the synchronization assembly 110 shown in Figure 8. Figure 8 shows the synchronization assembly 110 in an expanded state. The synchronization assembly 110 includes a first synchronization swing arm 10, a second synchronization swing arm 20, a first connecting shaft 30, a second connecting shaft 40, and a synchronization slider 50.

[0090] Please also refer to Figure 10, which is a schematic diagram of the partial structure of the rotating mechanism 100 shown in Figure 4. The rotating mechanism 100 shown in Figure 10 is in an expanded state. The first connecting shaft 30 and the second connecting shaft 40 are both fixed to the supporting base 400, and along the width direction of the supporting base 400, the first connecting shaft 30 and the second connecting shaft 40 are arranged in parallel and spaced apart. The first synchronous swing arm 10 is integrally formed and includes a first rotating portion 12, the first rotating portion 12 is provided with two helical surfaces 121, and the first rotating portion 12 is rotatably connected to the first connecting shaft 30. The second synchronous swing arm 20 includes a second rotating portion 22, the second rotating portion 22 is provided with two helical surfaces 221, and the second rotating portion 22 is rotatably connected to the second connecting shaft 40.

[0091] The synchronous slider 50 includes a first synchronous member 51 and a second synchronous member 51A fixedly connected along the width direction. The first synchronous member 51 is provided with two mating spiral surfaces 50A, and the second synchronous member 51A is provided with two mating spiral surfaces 50B; the first synchronous member 51 is slidably connected to the first connecting shaft 30, and the second synchronous member 51A is slidably connected to the second connecting shaft 40; the two mating spiral surfaces 50A respectively abut the two spiral surfaces 121, and the two mating spiral surfaces 50B respectively abut the two spiral surfaces 221.

[0092] In the related art, multiple gear transmissions are used to achieve synchronous rotation of the first synchronous swing arm 10 and the second synchronous swing arm 20, thereby achieving synchronous rotation of the first fixed plate 500 and the second fixed plate 600. However, due to the increasing demand for lightweight and thin foldable electronic devices 1000, the space reserved for gears is very small, and the gears are designed to be small. However, the excessively small size of the gears makes it difficult to ensure the structural strength of the gear teeth, which in turn affects the gear life and leads to poor synchronization during the folding and unfolding of the foldable electronic device 1000.

[0093] In this embodiment, a spiral structure is used to achieve synchronous transmission. The two spiral surfaces 121 are respectively matched with the two matching spiral surfaces 50A. Matching here means that the two spiral surfaces 121 are respectively in contact with the two matching spiral surfaces 50A, and the two spiral surfaces 121 can rotate along the two matching spiral surfaces 50A. The two spiral surfaces 221 are respectively matched with the two matching spiral surfaces 50B. Compared with the serrations of the gears in the prior art, the strength of the spiral structure is significantly enhanced. As a result, the overall structural strength of the synchronization component 110 can be increased, the service life of the synchronization component 110 can be extended, and the foldable electronic device 1000 has good synchronization during folding and unfolding.

[0094] In addition, in the related art, the first synchronous swing arm 10 is processed in two parts, which are then assembled in a detachable manner after being independently processed. This structural approach results in a complex structure of the synchronous assembly 110, a large number of parts, and a cumbersome assembly process.

[0095] In this embodiment, the first synchronous swing arm 10 is integrally formed, which simplifies the structure of the synchronous assembly 110, reduces the number of parts of the synchronous assembly 110, improves assembly convenience, and improves assembly efficiency.

[0096] The specific structure of each component of the synchronization component is described in detail below.

[0097] Please refer to Figures 11 and 12. Figure 11 is a structural schematic diagram of the first synchronous swing arm 10 of the synchronization assembly 110 shown in Figure 9, and Figure 12 is a structural schematic diagram of the first synchronous swing arm 10 shown in Figure 11 from another perspective. The first synchronous swing arm 10 includes a first swing arm 11 and a first rotating portion 12. Along the X-axis direction, the first swing arm 11 and the first rotating portion 12 are arranged in sequence and fixedly connected. The first swing arm 11 is in the shape of a rectangular parallelepiped, and the length direction of the first swing arm 11 is parallel to the X-axis direction. The first swing arm 11 includes a first swing section 13 and a second swing section 14. Along the X-axis direction, the first swing section 13 and the second swing section 14 are arranged in sequence and fixedly connected. The first rotating portion 12 is connected to the end of the second swing section 14 away from the first swing section 13.

[0098] The first swing section 13 includes a first swing side surface 15 and a second swing side surface 16 . Along the Y-axis direction, the first swing side surface 15 and the second swing side surface 16 are arranged opposite to each other. The first swing side surface 15 is provided with a first limiting protrusion 17 , and the second swing side surface 16 is provided with a second limiting protrusion 18 .

[0099] The first rotating portion 12 has two helical surfaces 121, which include a first helical surface 64 and a second helical surface 74. Specifically, the first rotating portion 12 includes a first rotating member 60 and a second rotating member 70, which are respectively connected to the second swinging section 14 and are spaced apart along the Y-axis direction.

[0100] The first rotating member 60 is provided with a first rotating hole 61. The first rotating hole 61 passes through the first rotating member 60 along the Y-axis direction, and the axial direction of the first rotating hole 61 is parallel to the Y-axis direction. The first rotating member 60 includes a first outer peripheral surface 62, a first inner peripheral surface 63, a first helical surface 64 and a first limiting surface 65. The first inner peripheral surface 63 is the inner peripheral surface of the first rotating hole 61, and the first outer peripheral surface 62 and the first inner peripheral surface 63 are arranged opposite to each other. The first helical surface 64 and the first limiting surface 65 are arranged at opposite ends of the first rotating member 60 along the Y-axis direction. The first helical surface 64 extends in a spiral around the axial direction of the first rotating hole 61, and the first helical surface 64 is in the shape of a sealing ring. Around the axial direction of the first rotating hole 61, the first helical surface 64 is in a shape that first gradually convexes and then gradually concave, that is, the first helical surface 64 is undulating, and a portion of the first helical surface 64 can be a plane. The first helical surface 64 faces the second rotating member 70 and is connected to one side of the first inner circumference 63 and the first outer circumference 62 on both sides. The first limiting surface 65 is connected to the other side of the first inner circumference 63 and the first outer circumference 62 on both sides.

[0101] The second rotating member 70 is provided with a second rotating hole 71, which extends through the second rotating member 70 along the Y-axis. The axial direction of the second rotating hole 71 is parallel to the Y-axis, and the second rotating hole 71 is coaxial with the first rotating hole 61. The second rotating member 70 includes a second outer peripheral surface 72, a second inner peripheral surface 73, a second helical surface 74, and a second limiting surface 75. The positions and connection relationship of the second outer peripheral surface 72, the second inner peripheral surface 73, the second helical surface 74, and the second limiting surface 75 are similar to those of the first outer peripheral surface 62, the first inner peripheral surface 63, the first helical surface 64, and the first limiting surface 65.

[0102] The second helical surface 74 is in the shape of a sealing ring and gradually convex and then concave around the axial direction of the second rotating hole 71, that is, the second helical surface 74 is undulating, and a portion of the second helical surface 74 may be flat.

[0103] In this embodiment, the first synchronous swing arm 10 is integrally formed, which simplifies the structure of the synchronous assembly 110, reduces the number of parts of the synchronous assembly 110, and thus increases assembly efficiency. In addition, the first helical surface 64 is located at the end of the first rotating member 60, and the first helical surface 64 does not extend into the interior of the first rotating hole 61. The second helical surface 74 is located at the end of the second rotating member 70, and the second helical surface 74 does not extend into the interior of the second rotating hole 71. Therefore, the first synchronous swing arm 10 can be formed using mold processing. Specifically, when processing the first synchronous swing arm 10, the raw material is placed in the lower mold of the mold, and then the lower mold is driven to snap onto the upper mold, so that the upper and lower molds cooperate to process the first rotating hole 61 and the second rotating hole 71. Because the first rotating hole 61 passes through the first rotating member 60 along the Y-axis direction and the second rotating hole 71 passes through the second rotating member 70 along the Y-axis direction, the mold can be removed from the Y-axis direction to process the first rotating hole 61 and the second rotating hole 71. When machining the first helicoidal surface 64 and the second helicoidal surface 74, the upper and lower dies are also used, and then the mold is ejected from the Z-axis direction. Using a mold to machine the first synchronous swing arm 10 can further improve machining efficiency. Of course, the first synchronous swing arm 10 can also be machined using a computer numerical control (CNC) machine tool.

[0104] Please refer to Figures 13 and 14. Figure 13 is a schematic diagram of the structure of the second synchronous swing arm 20 of the synchronization assembly 110 shown in Figure 9, and Figure 14 is a schematic diagram of the structure of the second synchronous swing arm 20 shown in Figure 12 from another perspective. The structure of the second synchronous swing arm 20 is the same as that of the first synchronous swing arm 10. The second synchronous swing arm 20 is equipped with two helical surfaces 221, including a third helical surface 84 and a fourth helical surface 94. Specifically, the second synchronous swing arm 20 includes a second swing arm 21 and a second rotating portion 22, which are arranged in sequence along the X-axis and fixedly connected. The second swing arm 21 is rectangular, with its length parallel to the X-axis. The second swing arm 21 includes a third swing section 23 and a fourth swing section 24, which are arranged in sequence along the X-axis and fixedly connected. The second rotating portion 22 is connected to the end of the fourth swing section 24 that is distal from the third swing section 23.

[0105] The third swing section 23 includes a third swing side surface 25 and a fourth swing side surface 26 . Along the Y-axis direction, the third swing side surface 25 and the fourth swing side surface 26 are arranged opposite to each other. The third swing side surface 25 is provided with a third limiting protrusion 27 , and the fourth swing side surface 26 is provided with a fourth limiting protrusion 28 .

[0106] The second rotating portion 22 includes a third rotating member 80 and a fourth rotating member 90 . The third rotating member 80 and the fourth rotating member 90 are respectively connected to the fourth swing section 24 , and the third rotating member 80 and the fourth rotating member 90 are spaced apart along the Y-axis direction.

[0107] The third rotating member 80 is provided with a third rotating hole 81, which extends through the third rotating member 80 along the Y-axis. The axial direction of the third rotating hole 81 is parallel to the Y-axis. The third rotating member 80 includes a third outer peripheral surface 82, a third inner peripheral surface 83, a third helical surface 84, and a third limiting surface 85. The positions and connection relationship of the third outer peripheral surface 82, the third inner peripheral surface 83, the third helical surface 84, and the third limiting surface 85 are similar to those of the first outer peripheral surface 62, the first inner peripheral surface 63, the first helical surface 64, and the first limiting surface 65. The structure of the third helical surface 84 is identical to that of the first helical surface 64 and will not be further described.

[0108] The fourth rotating member 90 is provided with a fourth rotating hole 91, which extends through the fourth rotating member 90 along the Y-axis. The axial direction of the fourth rotating hole 91 is parallel to the Y-axis and is coaxial with the third rotating hole 81. The fourth rotating member 90 includes a fourth outer peripheral surface 92, a fourth inner peripheral surface 93, a fourth helical surface 94, and a fourth limiting surface 95. The positions and connections of the fourth helical surface 94 are similar to those of the first outer peripheral surface 62, the first inner peripheral surface 63, the first helical surface 64, and the first limiting surface 65. The structure of the fourth helical surface 94 is identical to that of the second helical surface 74 and will not be further described.

[0109] The second synchronous swing arm 20 is integrally formed and can be manufactured in one go, resulting in high processing efficiency and reduced costs. This also simplifies the structure of the synchronous assembly 110, reducing the number of parts in the synchronous assembly 110 and thereby increasing assembly efficiency. The second synchronous swing arm 20 can be manufactured using a mold. The specific manufacturing process can be found in the description of the manufacturing process for the first synchronous swing arm 10 above. Of course, the second synchronous swing arm 20 can also be manufactured using a computer numerical control (CNC) machine tool.

[0110] Please refer to FIG. 15 and FIG. 16 . FIG. 15 is a structural diagram of the synchronization slider 50 of the synchronization assembly 110 shown in FIG. 9 , and FIG. 16 is a structural diagram of the synchronization slider 50 shown in FIG. 15 from another perspective.

[0111] The synchronous slider 50 includes a first synchronizer 51 and a second synchronizer 51A. The first synchronizer 51 is provided with two mating helical surfaces 50A, which include a first mating surface 55 and a second mating surface 56. The second synchronizer 51A is provided with two mating helical surfaces 50B, which include a third mating surface 55A and a fourth mating surface 56A. Specifically, the first synchronizer 51 and the second synchronizer 51A are arranged sequentially along the X-axis and fixedly connected. The first synchronizer 51 and the second synchronizer 51A are both cylindrical. The first synchronizer 51 is provided with a first through hole 52, which extends through the first synchronizer 51 along the Y-axis. The first synchronizer 51 includes a first outer surface 53, a first inner surface 54, a first mating surface 55 and a second mating surface 56. The first inner surface 54 is the inner circumferential surface of the first through hole 52. The first outer surface 53 and the first inner surface 54 are arranged opposite to each other. The first mating surface 55 and the second mating surface 56 are located at two opposite ends of the first synchronizer 51 along the Y-axis direction. The two sides of the first mating surface 55 are respectively connected to one side of the first inner surface 54 and the first outer surface 53. The two sides of the second mating surface 56 are respectively connected to the other side of the first inner surface 54 and the first outer surface 53.

[0112] The first mating surface 55 is in the shape of a sealing ring. Axially, around the first through-hole 52, the first mating surface 55 is gradually convex and then concave, that is, the first mating surface 55 has an undulating shape, and a portion of the first mating surface 55 may be flat. The shape of the second mating surface 56 is similar to that of the first mating surface 55 and will not be further described.

[0113] The second synchronizer 51A has a second through-hole 52A extending through the second synchronizer 51A along the Y-axis. The second synchronizer 51A includes a second outer surface 53A, a second inner surface 54A, a third mating surface 55A, and a fourth mating surface 56A. The shapes, positions, and connection relationships of the second outer surface 53A, second inner surface 54A, third mating surface 55A, and fourth mating surface 56A are similar to those of the first outer surface 53, first inner surface 54, first mating surface 55, and second mating surface 56.

[0114] The first outer surface 53 of the first synchronizer 51 and the second outer surface 53A of the second synchronizer 51A are fixedly connected, so that the width of the synchronizer slider 50 along the X-axis direction is relatively small, thereby reducing the volume of the synchronizer assembly 110 and facilitating a lightweight and thin design of the foldable electronic device 1000.

[0115] Please refer to Figure 17, which is a partial structural diagram of the rotating mechanism 100 shown in Figure 3. The rotating mechanism 100 shown in Figure 17 is in an expanded state. The connection relationship between the synchronization assembly 110, the supporting base 400, the first fixing plate 500 and the second fixing plate 600 is described in detail below.

[0116] In this embodiment, the synchronous slider 50, the first rotating member 60, the second rotating member 70, the third rotating member 80, and the fourth rotating member 90 are all mounted in the mounting groove 405 of the supporting base 400. The first synchronous member 51 is located in the gap between the first rotating member 60 and the second rotating member 70. Please refer to Figure 18, which is a schematic diagram of the assembly process of the synchronous assembly 110 shown in Figure 8. Figure 18 shows that the first through hole 52 of the first synchronous member 51, the first rotating hole 61 of the first rotating member 60, and the second rotating hole 71 of the second rotating member 70 are all coaxial. The second synchronous member 51A is located in the gap between the third rotating member 80 and the fourth rotating member 90. Figure 18 shows that the second through hole 52A of the second synchronous member 51A, the third rotating hole 81 of the third rotating member 80, and the fourth rotating hole 91 of the fourth rotating member 90 are all coaxial. The first limiting surface 65 contacts the first groove surface 406, and the second limiting surface 75 contacts the second groove surface 407, so that the first groove surface 406 and the second groove surface 407 restrict the first rotating portion 12 from moving along the Y-axis direction. The third limiting surface 85 contacts the first groove surface 406, and the fourth limiting surface 95 contacts the second groove surface 407, so that the first groove surface 406 and the second groove surface 407 restrict the second rotating portion 22 from moving along the Y-axis direction.

[0117] The first connecting shaft 30 and the second connecting shaft 40 are fixed to the supporting base 400. Specifically, the first connecting shaft 30 sequentially passes through the first through hole 52 of the first synchronizer 51, the first rotating hole 61 of the first rotating member 60, and the second rotating hole 71 of the second rotating member 70. The second connecting shaft 40 sequentially passes through the second through hole 52A of the second synchronizer 51A, the third rotating hole 81 of the third rotating member 80, and the fourth rotating hole 91 of the fourth rotating member 90. The two ends of the first connecting shaft 30 are respectively fixed in the first mounting hole 408 and the second mounting hole 409, while the two ends of the second connecting shaft 40 are respectively fixed in the third mounting hole and the fourth mounting hole. In addition, along the X-axis direction, the first connecting shaft 30 and the second connecting shaft 40 are arranged in parallel and spaced apart. The axial directions of the first connecting shaft 30 and the second connecting shaft 40 are both parallel to the Y-axis direction.

[0118] In addition, please refer to Figure 19, which is an enlarged structural diagram of point A in Figure 17. The two mating spiral surfaces 50A respectively abut the two spiral surfaces 121, and the two mating spiral surfaces 50B respectively abut the two spiral surfaces 221. Specifically, the first mating surface 55 of the first synchronizer 51 abuts the first spiral surface 64 of the first rotating member 60, and the second mating surface 56 of the first synchronizer 51 abuts the second spiral surface 74 of the second rotating member 70. The third mating surface 55A of the second synchronizer 51A abuts the third spiral surface 84 of the third rotating member 80, and the fourth mating surface 56A of the second synchronizer 51A abuts the fourth spiral surface 94 of the fourth rotating member 90.

[0119] Continuing with FIG17 , in the first swing arm 11 of the first synchronous swing arm 10, the entire first swing segment 13 and at least a portion of the second swing segment 14 are mounted within the first synchronous slot 505 of the first fixed plate 500. The first limiting protrusion 17 is located between the first limiting portion 508 and the bottom surface of the first synchronous slot 505, and the second limiting protrusion 18 is located between the second limiting portion 509 and the bottom surface of the first synchronous slot 505. In the second swing arm 21 of the second synchronous swing arm 20, the entire third swing segment 23 and at least a portion of the fourth swing segment 24 are mounted within the second synchronous slot 605 of the second fixed plate 600. The third limiting protrusion 27 is located between the third limiting portion 608 and the bottom surface of the second synchronous slot 605, and the fourth limiting protrusion 28 is located between the fourth limiting portion 609 and the bottom surface of the second synchronous slot 605.

[0120] The first rotating member 60 and the second rotating member 70 can rotate about the first connecting shaft 30, while the third rotating member 80 and the fourth rotating member 90 can rotate about the second connecting shaft 40. The first swing arm 11 can slide within the first synchronous sliding groove 505, while the second swing arm 21 can slide within the second synchronous sliding groove 605. The first limiting portion 508 cooperates with the first limiting protrusion 17, and the second limiting portion 509 cooperates with the second limiting protrusion 18 to prevent the first swing arm 11 from disengaging from the first synchronous sliding groove 505. The term "cooperation" here refers to the following: when the first swing arm 11 slides within the first synchronous slot 505 and tends to move upward along the Z-axis to disengage the first synchronous slot 505, the first limiting protrusion 17 will contact the first limiting portion 508, and the second limiting protrusion 18 will contact the second limiting portion 509. The first limiting portion 508 and the second limiting portion 509 will respectively prevent the first limiting protrusion 17 and the second limiting protrusion 18 from disengaging from the first synchronous slot 505. The first limiting protrusion 17 and the second limiting protrusion 18 are part of the first swing arm 11, thereby preventing the first swing arm 11 from disengaging from the first synchronous slot 505. The third limiting portion 608 cooperates with the third limiting protrusion 27, and the fourth limiting portion 609 cooperates with the fourth limiting protrusion 28 to prevent the second swing arm 21 from disengaging from the second synchronous slot 605. The term "cooperation" here has the same meaning as described above and will not be repeated here.

[0121] When installed in a mobile phone, the first fixing plate 500 is fixed to the first housing 210 , and the second fixing plate 600 is fixed to the second housing 220 .

[0122] The following describes in detail the process of switching the rotating mechanism 100 between the folded state and the unfolded state.

[0123] In this embodiment, when the rotating mechanism 100 is in the expanded state, the angle between the first fixed plate 500 and the second fixed plate 600 is 180 degrees (including the tolerance range), and the angle between the first synchronous swing arm 10 and the second synchronous swing arm 20 is 180 degrees (including the tolerance range).

[0124] Please refer to Figures 19 and 20. Figure 20 is a structural schematic diagram of the synchronization component provided by an embodiment of the present application in the expanded state from another perspective. When the rotating mechanism 100 is in the expanded state, the second helical surface 74 and the second mating surface 56 are in surface-to-surface contact, that is, the convex portion of the second helical surface 74 contacts the concave portion of the second mating surface 56, and the concave portion of the second helical surface 74 contacts the convex portion of the second mating surface 56. The first helical surface 64 and the first mating surface 55 are in partial contact. Specifically, the convex portion of the first helical surface 64 contacts the convex portion of the first mating surface 55, and the concave portion of the first helical surface 64 and the concave portion of the first mating surface 55 are spaced relative to each other along the Y-axis direction.

[0125] Similarly, the fourth helical surface 94 and the fourth mating surface 56A are in surface-to-surface contact, and the manner of contact between the fourth helical surface 94 and the fourth mating surface 56A refers to the surface-to-surface contact between the second helical surface 74 and the second mating surface 56. The third helical surface 84 and the third mating surface 55A are in partial contact, and the manner of contact between the third helical surface 84 and the third mating surface 55A refers to the partial contact between the first helical surface 64 and the first mating surface 55.

[0126] When the rotating mechanism 100 switches from the deployed state to the folded state, the first synchronous swing arm 10 can drive the second synchronous swing arm 20 to switch from the deployed state to the folded state via the synchronous slider 50. Conversely, when the second synchronous swing arm 20 switches from the deployed state to the folded state, the synchronous slider 50 can drive the first synchronous swing arm 10 to switch from the deployed state to the folded state.

[0127] Please refer to Figure 21, which is a schematic diagram of the intermediate process of the rotation mechanism 100 provided in an embodiment of the present application switching from the unfolded state to the folded state. The following uses the first synchronous swing arm 10 to drive the second synchronous swing arm 20 to switch to illustrate the process of the rotation mechanism 100 switching from the unfolded state to the folded state: the user can apply force to the first shell 210, so that the first shell 210 drives the first fixed plate 500 to rotate counterclockwise relative to the supporting base 400. At this time, the first swing arm 11 slides and rotates counterclockwise in the first synchronous slide groove 505, and at the same time, the first rotating member 60 and the second rotating member 70 rotate counterclockwise around the first connecting shaft 30. During the rotation of the first rotating member 60 and the second rotating member 70, the two helical surfaces 121 rotate along the two mating helical surfaces 50A. Specifically, the first helical surface 64 rotates along the first mating surface 55, and the convex portion of the first helical surface 64 gradually rotates to contact the concave portion of the first mating surface 55. The second helical surface 74 rotates along the second mating surface 56, and the raised portion of the second helical surface 74 gradually rotates to mate with the raised portion of the second mating surface 56, and the recessed portion of the second helical surface 74 gradually rotates to be opposite to and spaced from the recessed portion of the second mating surface 56. During this process, the second helical surface 74 pushes the second mating surface 56, causing the synchronous slider 50 to slide in the negative direction of the Y-axis.

[0128] When the synchronous slider 50 slides in the negative direction of the Y-axis, the fourth helical surface 94 synchronously pushes against the fourth mating surface 56A, causing the two helical surfaces 221 to rotate along the two mating helical surfaces 50B. Specifically, the third helical surface 84 rotates along the third mating surface 55A, and the fourth helical surface 94 rotates along the fourth mating surface 56A, causing the third rotating member 80 and the fourth rotating member 90 to rotate clockwise around the second connecting shaft 40. Simultaneously, the second swing arm 21 slides and rotates clockwise within the second synchronous slot 605. This in turn drives the second fixed plate 600 to rotate clockwise, causing it to fold synchronously with the first fixed plate 500.

[0129] Please refer to Figures 22 and 23. Figure 22 is a structural schematic diagram of the rotating mechanism 100 provided in an embodiment of the present application in a folded state. Figure 23 is a structural schematic diagram of the synchronization component 110 provided in an embodiment of the present application in a folded state. When the rotating mechanism 100 is in the folded state, the angle between the first fixed plate 500 and the second fixed plate 600 is 0 degrees, and the angle between the first swing arm 11 and the second swing arm 21 is 20 degrees. That is, when the rotating mechanism 100 switches from the unfolded state to the folded state, the first fixed plate 500 and the second fixed plate 600 are both rotated 90 degrees (including the tolerance range), and the first swing arm 11 and the second swing arm 21 are both rotated 80 degrees (including the tolerance range).

[0130] In addition, please refer to Figures 24 and 25. Figure 24 is another structural schematic diagram of the synchronization component provided in an embodiment of the present application in a folded state, and Figure 25 is a structural schematic diagram of the synchronization component provided in an embodiment of the present application in a folded state from another perspective. When the rotating mechanism 100 is in the folded state, the second helical surface 74 and the second mating surface 56 are in partial contact. Specifically, the raised portion of the second helical surface 74 contacts the raised portion of the second mating surface 56, and the recessed portion of the second helical surface 74 and the recessed portion of the second mating surface 56 are spaced relative to each other along the Y-axis direction. The first helical surface 64 and the first mating surface 55 are in surface-to-surface contact. Specifically, the raised portion of the first helical surface 64 contacts the recessed portion of the first mating surface 55, and the recessed portion of the first helical surface 64 contacts the raised portion of the first mating surface 55.

[0131] Similarly, the fourth helical surface 94 and the fourth mating surface 56A are in partial contact, and the mating manner between the fourth helical surface 94 and the fourth mating surface 56A refers to the partial contact manner between the second helical surface 74 and the second mating surface 56. The third helical surface 84 and the third mating surface 55A are in surface-to-surface contact, and the mating manner between the third helical surface 84 and the third mating surface 55A refers to the surface-to-surface contact manner between the first helical surface 64 and the first mating surface 55.

[0132] When the rotating mechanism 100 switches from the folded state to the unfolded state, the first synchronous swing arm 10 can drive the second synchronous swing arm 20 to switch from the folded state to the unfolded state via the synchronous slider 50. Conversely, when the second synchronous swing arm 20 switches from the folded state to the unfolded state, the synchronous slider 50 can drive the first synchronous swing arm 10 to switch from the folded state to the unfolded state.

[0133] The following describes the process of the rotating mechanism 100 switching from the folded state to the unfolded state by using the first synchronous swing arm 10 to drive the second synchronous swing arm 20 to switch: the user can apply force to the first shell 210, so that the first shell 210 drives the first fixed plate 500 to rotate clockwise relative to the supporting base 400. The first swing arm 11 slides and rotates clockwise in the first synchronous slide groove 505. At the same time, the first rotating member 60 and the second rotating member 70 rotate clockwise around the first connecting shaft 30. During the rotation of the first rotating member 60 and the second rotating member 70, the two helical surfaces 121 rotate along the two mating helical surfaces 50A. Specifically, the first helical surface 64 rotates along the first mating surface 55, and the second helical surface 74 rotates along the second mating surface 56, so that the synchronous slider 50 slides in the positive direction of the Y-axis.

[0134] When the synchronous slider 50 slides in the positive direction of the Y-axis, the two mating helical surfaces 50B push the two helical surfaces 221 in the positive direction of the Y-axis, causing the two helical surfaces 221 to rotate along the two mating helical surfaces 50B. Specifically, the third helical surface 84 rotates along the third mating surface 55A, and the fourth helical surface 94 rotates along the fourth mating surface 56A, causing the third rotating member 80 and the fourth rotating member 90 to rotate counterclockwise around the second connecting shaft 40. Simultaneously, the second swing arm 21 slides and rotates counterclockwise within the second synchronous slot 605, thereby driving the second fixed plate 600 to rotate counterclockwise. The second fixed plate 600 then drives the second housing 220 to rotate, causing the second fixed plate 600 and the first fixed plate 500 to deploy synchronously, achieving synchronous deployment of the second housing 220 and the first housing 210.

[0135] In the related art, multiple saw teeth are matched, and the saw teeth are very small, so the strength of the two saw teeth when matched together is insufficient. In this embodiment, a spiral structure is used to achieve synchronous transmission. The two spiral surfaces 121 match with the two matching spiral surfaces 50A, and the two spiral surfaces 221 match with the two matching spiral surfaces 50B. Specifically, the first spiral surface 64 and the second spiral surface 74 of the first synchronous swing arm 10 match with the first matching surface 55 and the second matching surface 56 of the synchronous slider 50, and the third spiral surface 84 and the fourth spiral surface 94 of the second synchronous swing arm 20 match with the second matching surface 56 and the third matching surface 55A of the synchronous slider 50. Compared with the saw teeth of the gears in the related art, the spiral surface is a single integral structure, and the spiral surface and the spiral matching surface are matched face to face, which significantly enhances its structural strength. As a result, the overall structural strength of the synchronization assembly 110 can be increased, the service life of the synchronization assembly 110 can be extended, and the foldable electronic device 1000 can have good synchronization during folding and unfolding.

[0136] In addition, please refer to Figure 26, which is a schematic diagram of the structure of a foldable electronic device 1000 provided in an embodiment of the present application in a folded state. The foldable electronic device 1000 shown in Figure 26 is an outward-folding mobile phone. In this embodiment, the rotation mechanism 100 is applied to an outward-folding mobile phone. That is, when the mobile phone is in the folded state, the display screen 300 is located on the outside and is visible. In this case, along the thickness direction of the mobile phone, the first display portion 310, the first housing 210, the second housing 220, and the second display portion 320 are arranged in sequence. That is, the first housing 210 and the second housing 220 are located between the first display portion 310 and the second display portion 320. This creates a large distance between the first display portion 310 and the second display portion 320, thus providing sufficient space for the third display portion 330 to bend, resulting in a larger radius of curvature when the third display portion 330 bends. As is well known to those skilled in the art, for a curve, a larger radius of curvature reduces the curvature and the closer it approaches a straight line; a smaller radius of curvature reduces the curvature. Similarly, the larger the radius of curvature of the third display portion 330, the smaller its curvature, and the more planar the third display portion 330 becomes. Therefore, the third display portion 330 is less likely to break. Because the third display portion 330 already has sufficient space to prevent it from breaking when the display screen 300 is on the outside of the phone, there is no need to reserve bending space on the inside of the phone for the third display portion 330.

[0137] Please refer to Figure 27, which is a schematic diagram of a foldable electronic device 1000 in the folded state, according to the related art. The foldable electronic device 1000 shown in Figure 27 is an inward-folding mobile phone. In the related art inward-folding mobile phones, when the phone is folded, the display screen 300 is located on the inner side of the phone. At this time, the first display portion 310 and the second display portion 320 are directly opposite each other without any spacing. Therefore, the third display portion 330 does not have sufficient space to bend. In this case, if the third display portion 330 is bent directly, its radius of curvature will be small, meaning that the third display portion 330 will bend only slightly, making it easy to break. In the related art, to provide sufficient space for the third display portion 330 to bend and achieve a larger radius of curvature, the first and second synchronizing swing arms 10 and 20 need to be rotated approximately 110 degrees, so that the first housing 210, the second housing 220, and the rotating mechanism 100 form a teardrop-shaped space. The third display portion 330 may be curved into a teardrop shape within the teardrop-shaped space. In this case, the third display portion 330 has a larger curvature radius.

[0138] It is well known to those skilled in the art that if the width of the first rotating portion 12 and the second rotating portion 22 along the X-axis is too small, interference will occur between the first swing arm 11 and the second swing arm 21 when the first synchronous swing arm 10 and the second synchronous swing arm 20 rotate by an angle exceeding 90 degrees. Therefore, in order to meet the requirement that the first synchronous swing arm 10 and the second synchronous swing arm 20 rotate approximately 110 degrees, a larger gap is required between the first rotating portion 12 and the second rotating portion 22. The first synchronizer 51 and the first rotating portion 12 correspond along the Y-axis, and the second synchronizer 51A and the second rotating portion 70 correspond along the Y-axis. Therefore, the distance between the first synchronizer 51 and the second synchronizer 51A along the X-axis is also relatively large. In the related art, the first synchronizer 51 and the second synchronizer 51A are fixedly connected by providing a wider connecting block. Therefore, the overall width of the synchronizer assembly 110 is relatively wide, which is not conducive to the lightweight design of the mobile phone.

[0139] In this embodiment, please continue to refer to Figure 26. When the mobile phone is in the folded state, there is no need to consider the bending space of the third display unit 330. At this time, the rotation angle requirements for the first swing arm 11 and the second swing arm 21 are as follows: ensure that the angle between the first fixing plate 500 and the second fixing plate 600 is approximately 0 degrees, and the first swing arm 11 will not disengage from the first synchronization slot 505. At the same time, the second swing arm 21 will not disengage from the second synchronization slot 605. When the above conditions are met, the rotation angles of the first swing arm 11 and the second swing arm 21 do not need to reach or exceed 90 degrees. In other words, the rotation angles of the first swing arm 11 and the second swing arm 21 are both less than 90 degrees. Specifically, the first swing arm 11 and the second swing arm 21 can both rotate approximately 80 degrees. For example, the rotation angles a of the first swing arm 11 and the second swing arm 21 both meet the following conditions: 89 degrees ≥ a ≥ 75 degrees.

[0140] When the required rotation angle of the first swing arm 11 and the second swing arm 21 is approximately 80 degrees, the width requirement of the synchronization slider 50 along the X-axis direction is reduced. In other words, the width of the synchronization slider 50 can be reduced. The first outer surface 53 of the first synchronization member 51 and the second outer surface 53A of the second synchronization member 51A can be directly fixedly connected or fixedly connected via a narrower connection. This can further reduce the overall width of the synchronization assembly 110, facilitating a lightweight and thin design of the foldable electronic device 1000.

[0141] When the rotation angle of the first swing arm 11 and the second swing arm 21 decreases, the length requirements for the first helical surface 64, the second helical surface 74, the third helical surface 84, the third helical surface 84, the fourth helical surface 94, the first mating surface 55, the second mating surface 56, the third mating surface 55A, and the fourth mating surface 56A are correspondingly reduced. Therefore, the first helical surface 64 is completely located at the end of the first rotating member 60 and does not extend into the interior of the first rotating hole. The second helical surface 74 is completely located at the end of the second rotating member 70 and does not extend into the interior of the second rotating hole 71. Therefore, in this embodiment, the first synchronous swing arm 10 does not need to be divided into two parts and can be processed using a mold. While improving the processing efficiency of the first synchronous swing arm 10, it also simplifies the structure of the synchronous assembly 110, reduces the number of parts of the synchronous assembly 110, improves assembly convenience, and improves assembly efficiency.

[0142] Similarly, the third helical surface 84 is completely located at the end of the third rotating member 80 and does not extend into the interior of the third rotating hole 81. The fourth helical surface 94 is completely located at the end of the fourth rotating member 90 and does not extend into the interior of the fourth rotating hole 91. Therefore, the second synchronous swing arm 20 can be processed using a mold without being divided into two parts. This improves the processing efficiency of the second synchronous swing arm 20 while further simplifying the structure of the synchronous assembly 110, reducing the number of parts of the synchronous assembly 110, and improving assembly convenience and efficiency.

[0143] The first mating surface 55 and the second mating surface 56 are completely located at the end of the first synchronizer 51 and do not extend into the first through hole 52. The third mating surface 55A and the fourth mating surface 56A are completely located at the end of the second synchronizer 51A and do not extend into the second through hole 52A. This allows the synchronizer slider 50 to be processed using a mold, thereby improving processing efficiency.

[0144] Please refer to Figure 28, which is a schematic diagram of the structure of a synchronization assembly 110 provided in another embodiment of the present application. Figure 28 shows synchronization assembly 110 in an expanded state. Another embodiment of the present application provides a synchronization assembly 110, which includes a first synchronization swing arm 10, a second synchronization swing arm 20, a first connecting shaft 30, a second connecting shaft 40, and a synchronization slider 50.

[0145] The structures of the first synchronous swing arm 10 and the second synchronous swing arm 20 are substantially the same as those in the above-described embodiment. The first synchronous swing arm 10 comprises a first swing arm 11 and a first rotating portion 12. The first swing arm 11 comprises a first swinging section 13 and a second swinging section 14. The first swinging section 13 is provided with a first limiting protrusion 17 and a second limiting protrusion 18 on either side thereof. The first rotating portion 12 comprises a first rotating member 60 and a second rotating member 70. The second synchronous swing arm 20 comprises a second swing arm 21 and a second rotating portion 22. The second swing arm 21 comprises a third swinging section 23 and a fourth swinging section 24. The third swinging section 23 is provided with a third limiting protrusion 27 and a fourth limiting protrusion 28 on either side thereof.

[0146] The difference from the above embodiment is that the first outer circumferential surface 62 of the first rotating member 60 is provided with first synchronous teeth 66. The first synchronous teeth 66 include a plurality of serrations that are spaced apart and axially distributed around the first outer circumferential surface 62 of the first rotating member 60. The second outer circumferential surface 72 of the second rotating member 70 is provided with second synchronous teeth 76. The third outer circumferential surface 82 of the third rotating member 80 is provided with third synchronous teeth 86. The fourth outer circumferential surface 92 of the fourth rotating member 90 is provided with fourth synchronous teeth 96. The structure and distribution of the second, third, and fourth synchronous teeth 76, 86, and 96 are similar to those of the first synchronous teeth 66. The first synchronous teeth 66 and the third synchronous teeth 86 mesh with each other, and the second synchronous teeth 76 and the fourth synchronous teeth 96 mesh with each other.

[0147] When the rotating mechanism 100 switches from the deployed state to the folded state, or vice versa, the first synchronizer tooth 66 and the third synchronizer tooth 86 cooperate with each other. Here, cooperation refers to the sequential engagement of the multiple serrations of the first synchronizer tooth 66 and the multiple serrations of the second synchronizer tooth 76 when the first swing arm 11 and the second swing arm 21 rotate. The second synchronizer tooth 76 and the fourth synchronizer tooth 96 cooperate with each other. This cooperation is synonymous with the cooperation between the first synchronizer tooth 66 and the third synchronizer tooth 86 described above and will not be further described. This increases the synchronization of the rotation of the first synchronizer arm 10 and the second synchronizer arm 20, thereby increasing the synchronization of the rotation of the first fixed plate 500 and the second fixed plate 600. Furthermore, the first synchronizer tooth 66 and the second synchronizer tooth 76 are symmetrical about the first synchronizer 51, and the third synchronizer tooth 86 and the fourth synchronizer tooth 96 are symmetrical about the second synchronizer 51A, resulting in more stable and synchronized operation of the synchronizer assembly 110.

[0148] Please refer to Figure 29, which is a schematic diagram of the structure of a synchronization assembly 110 provided in another embodiment of the present application. Figure 29 shows synchronization assembly 110 in an expanded state. Another embodiment of the present application provides a synchronization assembly 110, which includes a first synchronization swing arm 10, a second synchronization swing arm 20, a first connecting shaft 30, a second connecting shaft 40, and a synchronization slider 50.

[0149] The structures of the first synchronous swing arm 10 and the second synchronous swing arm 20 are substantially the same as those in the above-described embodiment. The first synchronous swing arm 10 comprises a first swing arm 11 and a first rotating portion 12. The first swing arm 11 comprises a first swinging section 13 and a second swinging section 14. The first swinging section 13 is provided with a first limiting protrusion 17 and a second limiting protrusion 18 on either side thereof. The first rotating portion 12 comprises a first rotating member 60 and a second rotating member 70. The second synchronous swing arm 20 comprises a second swing arm 21 and a second rotating portion 22. The second swing arm 21 comprises a third swinging section 23 and a fourth swinging section 24. The third swinging section 23 is provided with a third limiting protrusion 27 and a fourth limiting protrusion 28 on either side thereof.

[0150] The first rotating member 60 has a first helical surface 64 at its end, the second rotating member 70 has a second helical surface 74 at its end, the third rotating member 80 has a third helical surface 84 at its end, and the fourth rotating member 90 has a fourth helical surface 94 at its end. The first synchronizer 51 has a first mating surface 55 and a second mating surface 56 at its ends, respectively. The second synchronizer 51A has a third mating surface 55A and a fourth mating surface 56A at its ends, respectively.

[0151] The difference from the above embodiment is that the first mating surface 55 is provided with a first protrusion 57 , the orthographic projection of the first protrusion 57 on the first mating surface 55 may be circular, and the outer surface of the first protrusion 57 is a convex arc surface.

[0152] Please also refer to Figure 30, which is a schematic diagram of the structure of the synchronization slider 50 of the synchronization assembly 110 shown in Figure 29. There are multiple first protrusions 57, where "multiple" here means two or more. The multiple first protrusions 57 are arranged at intervals along the extension direction of the first mating surface 55. The first protrusions 57 can be provided in a partial area along the extension direction of the first mating surface 55, or they can be evenly distributed across the entire extension direction of the first mating surface 55.

[0153] A second protrusion is provided on the second mating surface 56, a third protrusion 57A is provided on the third mating surface 55A, and a fourth protrusion is provided on the fourth mating surface 56A. The shapes of the second, third, and fourth protrusions 57A are identical to those of the first protrusion 57. Multiple protrusions are permitted, and the arrangement of the second, third, and fourth protrusions 57A is identical to that of the first protrusion 57. Details will not be repeated here.

[0154] In this embodiment, when the synchronous slider 50, the first rotating portion 12 of the first synchronous swing arm 10, and the second rotating portion 22 of the second synchronous swing arm 20 are all installed in the installation groove 405 of the support base 400, the first protrusion 57 abuts the first helical surface 64 of the first rotating member 60, the second protrusion abuts the second helical surface 74 of the second rotating member 70. The third protrusion 57A abuts the third helical surface 84 of the third rotating member 80, and the fourth protrusion abuts the fourth helical surface 94 of the fourth rotating member 90.

[0155] When the rotating mechanism 100 switches from the expanded state to the folded state, or from the folded state to the expanded state, the first helical surface 64 rotates along the first protrusion 57, the second helical surface 74 rotates along the second protrusion, the third helical surface 84 rotates along the third protrusion 57A, and the fourth helical surface 94 rotates along the fourth protrusion.

[0156] In this embodiment, by providing the first protrusion 57 and making the first protrusion 57 contact the first helical surface 64, the contact area between the first rotating member 60 and the first synchronous member 51 is reduced. During the state switching process of the rotating mechanism 100, the friction between the first rotating member 60 and the first synchronous member 51 can be reduced. By the same token, the friction between the second rotating member 70 and the first synchronous member 51 is reduced, the friction between the third rotating member 80 and the second synchronous member 51A is reduced, and the friction between the fourth rotating member 90 and the second synchronous member 51A is reduced. Ultimately, the friction between the first synchronous swing arm 10 and the synchronous slider 50 is reduced, and the friction between the second synchronous swing arm 20 and the synchronous slider 50 is reduced, so that the synchronous assembly 110 runs more smoothly.

[0157] Please refer to Figure 31, which is a schematic structural diagram of another embodiment of the synchronization slider 50 of the synchronization assembly 110 shown in Figure 29. In other embodiments, the first protrusion 57 can be in the shape of an elongated strip, and the extension direction of the first protrusion 57 is the same as the extension direction of the first helical surface 64. Similarly, the second protrusion, the third protrusion 57A, and the fourth protrusion can also be in the shape of an elongated strip. In this case, the synchronization assembly 110 can operate more smoothly and with better stability. The first protrusion 57 can be arranged around a circle, and the length of the first protrusion 57 can also be only a portion of the length of the first mating surface 55.

[0158] In other embodiments, the first protrusion 57 may be protruded from the first helical surface 64, the second protrusion may be protruded from the second helical surface 74, the third protrusion 57A may be protruded from the third helical surface 84, and the fourth protrusion may be protruded from the fourth helical surface 94. When the synchronization assembly 110 is mounted on the supporting base 400, the first protrusion 57 abuts against the first mating surface 55, the second protrusion abuts against the second mating surface 56, the third protrusion 57A abuts against the third mating surface 55A, and the fourth protrusion abuts against the fourth mating surface 56A. At this time, the contact area between the first synchronization swing arm 10 and the synchronization slider 50 is also reduced, and the contact area between the second synchronization swing arm 20 and the synchronization slider 50 is also reduced, so that the friction between the first synchronization swing arm 10 and the synchronization slider 50 is reduced, and the friction between the second synchronization swing arm 20 and the synchronization slider 50 is reduced, so that the synchronization assembly 110 operates more smoothly.

[0159] The above are only some of the embodiments and implementations of this application. The scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A rotating mechanism, characterized in that: include: A bearing base, a first connecting shaft, a second connecting shaft, a first synchronous swing arm, a second synchronous swing arm and a synchronous slider; The first connecting shaft and the second connecting shaft are both fixed to the bearing base, and along the width direction of the bearing base, the first connecting shaft and the second connecting shaft are parallel and spaced apart; The first synchronous swing arm includes a first rotating portion, the first rotating portion is provided with two spaced-apart spiral surfaces, and the first rotating portion is rotatably connected to the first connecting shaft; the first synchronous swing arm is integrally formed; The second synchronous swing arm includes a second rotating portion, the second rotating portion is provided with two spaced-apart, opposite spiral surfaces, and the second rotating portion is rotatably connected to the second connecting shaft; The synchronous slider includes a first synchronous member and a second synchronous member fixedly connected along the width direction, the first synchronous member is provided with two mating helical surfaces, and the second synchronous member is provided with two mating helical surfaces; the first synchronous member is slidably connected to the first connecting shaft and is located between the two helical surfaces of the first rotating part, and the two helical surfaces of the first rotating part are respectively abutted against the two mating helical surfaces of the first synchronous member; the second synchronous member is slidably connected to the second connecting shaft and is located between the two helical surfaces of the second rotating part, and the two helical surfaces of the second rotating part are respectively abutted against the two mating helical surfaces of the second synchronous member.

2. The rotation mechanism according to claim 1, characterized in that: When the first synchronous swing arm rotates, the first rotating part rotates around the first connecting shaft, and the two helical surfaces of the first rotating part rotate along the two matching helical surfaces of the first synchronous part; the first synchronous part slides along the axial direction of the first connecting shaft, and at the same time, the second synchronous part slides along the axial direction of the second connecting shaft; the two matching helical surfaces of the second synchronous part push the two helical surfaces of the second rotating part, and the two helical surfaces of the second rotating part rotate along the two matching helical surfaces of the second synchronous part, the second rotating part rotates around the second connecting shaft, and the second synchronous swing arm and the first synchronous swing arm rotate synchronously.

3. The rotation mechanism according to claim 1, characterized in that: The first rotating part includes a first rotating member and a second rotating member, the first rotating member is provided with a first rotating hole, and the second rotating member is provided with a second rotating hole; along the length direction of the rotating mechanism, the first rotating member and the second rotating member are arranged at intervals, and the first connecting shaft passes through the first rotating hole and the second rotating hole; The two helical surfaces of the first rotating part are respectively a first helical surface and a second helical surface; the first helical surface is provided at the end of the first rotating member, and the first helical surface extends axially around the first rotating hole; the second helical surface is provided at the end of the second rotating member, and the second helical surface extends axially around the second rotating hole.

4. The rotation mechanism according to claim 3, characterized in that: The first synchronizer is provided with a first through hole, and the two mating spiral surfaces of the first synchronizer are respectively a first mating surface and a second mating surface, the first mating surface and the second mating surface are provided at opposite ends of the first synchronizer along the length direction; the first mating surface and the second mating surface both extend axially around the first through hole; The first synchronous member is arranged in the interval between the first rotating member and the second rotating member, and the first connecting shaft also passes through the first through hole; the first matching surface abuts the first helical surface, and the second matching surface abuts the second helical surface.

5. The rotating mechanism according to any one of claims 1 to 4, characterized in that: The second synchronous swing arm is integrally formed.

6. The rotation mechanism according to claim 5, characterized in that: The second rotating portion includes a third rotating member and a fourth rotating member, the third rotating member is provided with a third rotating hole, and the fourth rotating member is provided with a fourth rotating hole; along the length direction of the rotating mechanism, the third rotating member and the fourth rotating member are arranged at intervals, and the second connecting shaft passes through the third rotating hole and the fourth rotating hole; The two helical surfaces of the second rotating part are respectively a third helical surface and a fourth helical surface; the third helical surface is provided at the end of the third rotating member, and the third helical surface extends axially around the first rotating hole; the fourth helical surface is provided at the end of the fourth rotating member, and the fourth helical surface extends axially around the fourth rotating hole.

7. The rotation mechanism according to claim 6, characterized in that: The second synchronizer is provided with a second through hole, and the two mating spiral surfaces of the second synchronizer are respectively a third mating surface and a fourth mating surface, the third mating surface and the fourth mating surface are provided at opposite ends of the second synchronizer along the length direction; the third mating surface and the fourth mating surface both extend around the axial direction of the second through hole; The second synchronizer is arranged in the interval between the third rotating member and the fourth rotating member, and the second connecting shaft also passes through the second through hole; the third mating surface abuts the third helical surface, and the fourth mating surface abuts the fourth helical surface.

8. The rotating mechanism according to any one of claims 1 to 7, characterized in that: The two helical surfaces of the first rotating part include a first helical surface, the two matching helical surfaces of the first synchronizer include a first matching surface, and the first helical surface faces the first matching surface; The first helical surface is provided with a first protrusion, and the first matching surface abuts against the first protrusion; or the first matching surface is provided with a first protrusion, and the first protrusion abuts against the first helical surface.

9. The rotation mechanism according to claim 8, characterized in that: There are multiple first protrusions. When the first protrusion is provided on the first spiral surface, the multiple first protrusions are arranged at intervals along the extension direction of the first spiral surface; when the first protrusion is provided on the first mating surface, the multiple first protrusions are arranged at intervals along the extension direction of the first mating surface.

10. The rotating mechanism according to claim 8, characterized in that: The first protrusion is in the shape of an elongated strip. When the first protrusion is provided on the first spiral surface, the extension direction of the first protrusion is the same as the extension direction of the first spiral surface; when the first protrusion is provided on the first mating surface, the extension direction of the first protrusion is the same as the extension direction of the first mating surface.

11. The rotating mechanism according to any one of claims 1 to 10, characterized in that: The first rotating part includes a first rotating member, and the second rotating part includes a third rotating member; the first rotating member includes a first outer peripheral surface, and the first outer peripheral surface is provided with a first synchronous tooth; the third rotating member includes a third outer peripheral surface, and the third outer peripheral surface is provided with a third synchronous tooth; The first rotating member is rotatably connected to the first connecting shaft, and the third rotating member is rotatably connected to the second connecting shaft; the first rotating member and the third rotating member are arranged along the width direction, and the first synchronous tooth is engaged with the third synchronous tooth.

12. The rotating mechanism according to claim 11, characterized in that: The first rotating part further includes a second rotating member, and the second rotating part further includes a fourth rotating member; the second rotating member includes a second outer peripheral surface, and the second outer peripheral surface is provided with a second synchronous tooth; the fourth rotating member includes a fourth outer peripheral surface, and the fourth outer peripheral surface is provided with a fourth synchronous tooth; The second rotating member is rotatably connected to the first connecting shaft, and the fourth rotating member is rotatably connected to the second connecting shaft; the second rotating member and the fourth rotating member are arranged along the width direction, and the second synchronous tooth engages with the fourth synchronous tooth.

13. The rotating mechanism according to any one of claims 1 to 12, characterized in that: The rotating mechanism further includes a first fixing plate and a second fixing plate; the first fixing plate and the second fixing plate are respectively located on opposite sides of the bearing base along the width direction of the rotating mechanism; The first synchronous swing arm further includes a first swing arm, and the second synchronous swing arm further includes a second swing arm; along the width direction, the first swing arm is fixedly connected to the first rotating part, and the second swing arm is fixedly connected to the second rotating part; The first swing arm is slidably and rotatably connected to the first fixed plate, and the second swing arm is slidably and rotatably connected to the second fixed plate; The first fixed plate rotates around the bearing base, causing the first swing arm to rotate around the bearing base, the first rotating part rotates around the first connecting shaft, the two helical surfaces of the first rotating part rotate along the two matching helical surfaces of the first synchronizer, the first synchronizer slides along the first connecting shaft, the second synchronizer slides along the second connecting shaft, and the two helical surfaces of the second rotating part rotate along the two matching helical surfaces of the second synchronizer, so that the second fixed plate and the first fixed plate rotate synchronously.

14. The rotating mechanism according to any one of claims 1 to 13, characterized in that: The rotating mechanism is applied to an outward-folding electronic device; the rotating angles of the first synchronous swing arm and the second synchronous swing arm are both less than 90 degrees.

15. A foldable electronic device, characterized in that: The invention comprises a first shell, a second shell and the rotating mechanism according to any one of claims 1 to 14; the rotating mechanism is connected between the first shell and the second shell.

16. The foldable electronic device according to claim 15, wherein: The foldable electronic device further includes a display screen, the display screen including a first display portion, a second display portion, and a third display portion, the third display portion being connected between the first display portion and the second display portion; The first display portion is provided on the first housing, the second display portion is provided on the second housing, and the third display portion is provided on the rotating mechanism; When the foldable electronic device is in a folded state, the first shell and the second shell are stacked along the thickness of the foldable electronic device, the first display part is located on the side of the first shell facing away from the second shell, and the second display part is located on the side of the second shell facing away from the first shell.

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