Rotating mechanism and folding electronic device

Abstract

A rotating mechanism (100) and a folding electronic device (1000). The rotating mechanism (100) comprises: damping swing arms (10), wherein the damping swing arms (10) each comprise a body (20) and concave cams (30); the body (20) comprises a swinging body (21) and a rotating body (22); in the length direction of the damping swing arms (10), the swinging bodies (21) are fixedly connected to the rotating bodies (22); in the width direction of the damping swing arms (10), the concave cams (30) are coaxially and fixedly connected to the rotating bodies (22); and each body (20) has first Rockwell hardness, each concave cam (30) has second Rockwell hardness, the second Rockwell hardness is greater than the first Rockwell hardness, and the concave cams (30) and the bodies (20) are made of different materials.

Description

Rotating mechanism and foldable electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 11, 2024, with application number 202420073898.4 and application name “A Rotating Mechanism and Foldable Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] 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.

[0004] In current rotating mechanisms, damping swing arms usually integrate damping and rotating functions. However, the current damping function structure is prone to wear problems, resulting in a decrease in damping force. Summary of the Invention

[0005] The present application provides a rotating mechanism and a foldable electronic device, wherein the damping functional structure has good wear resistance and prevents the damping force from decreasing.

[0006] The first aspect of the present application provides a rotation mechanism, including: a damping swing arm, the damping swing arm includes a main body and a concave cam; the main body includes a swinging body and a rotating body, and the swinging body and the rotating body are fixedly connected along the length direction of the damping swing arm; the concave cam and the rotating body are fixedly connected along the width direction of the damping swing arm; the main body has a first Rockwell hardness, and the concave cam has a second Rockwell hardness, and the second Rockwell hardness is greater than the first Rockwell hardness.

[0007] In the related art, the main body and the concave cam are integrally formed using the same material. However, since the main body is primarily subjected to significant forces when the foldable electronic device switches between the folded and unfolded states, as well as when the foldable electronic device falls from a height, while the concave cam is primarily subjected to wear and tear between adjacent parts when the foldable electronic device switches between the unfolded and folded states, the concave cam is primarily subjected to wear forces. When the main body and the concave cam are integrally formed using the same material, the force requirements of the concave cam cannot be met, resulting in severe wear of the concave cam, which in turn causes a decrease in the damping force during the opening and closing process of the foldable electronic device, resulting in a reduced opening and closing feel.

[0008] In the embodiment of the present application, the concave cam and the body are made of different materials. Furthermore, the Rockwell hardness of the concave cam is greater than that of the body, which can enhance the wear resistance of the concave cam and thus enable the concave cam to withstand greater wear forces. This ensures the damping force during the opening and closing of the foldable electronic device, ensuring a smooth opening and closing experience.

[0009] In addition, since the wear resistance requirement of the main body is lower than that of the concave cam, the main body can be made of a material with a Rockwell hardness lower than that of the concave cam.

[0010] In some embodiments, the first Rockwell hardness A1 satisfies the following condition: A1 ≥ a, and the second Rockwell hardness A2 satisfies the following condition: A2 < a, wherein 50HRC ≥ a ≥ 45HRC. For example, the body can be made of G18 steel, and the concave cam can be made of SKD-11 steel.

[0011] In some embodiments, the body has a first yield strength, and the concave cam has a second yield strength, the second yield strength being less than the first yield strength.

[0012] Since the main body is mainly subjected to greater forces when the foldable electronic device switches between the folded and unfolded states, and is also subjected to greater forces when the foldable electronic device falls from a height, that is, the main body is mainly subjected to bending stress and falling force. The concave cam is mainly subjected to wear and tear between adjacent parts when the foldable electronic device switches between the unfolded and folded states, that is, the concave cam is mainly subjected to wear forces. Therefore, the main body and the concave cam have different yield strengths. In this embodiment, the concave cam and the main body are made of different materials, and the yield strength of the main body is greater than the yield strength of the concave cam, thereby allowing the main body to withstand greater falling forces and reducing the risk of the main body breaking. The concave cam can be made of a material with a lower yield strength.

[0013] In some embodiments, the concave cam includes axially opposed concave and convex portions and a first mounting end, and the rotating body includes two axially opposed second mounting ends; the first mounting end is provided with a first limiting groove, and at least one of the second mounting ends is provided with a first limiting protrusion; or, the second mounting end is provided with a first limiting groove, and at least one of the first mounting ends is provided with a first limiting protrusion; the first limiting protrusion extends into the first limiting groove to limit circumferential and / or radial movement of the concave cam. In this manner, relative circumferential or radial movement between the concave cam and the rotating body can be limited, thereby increasing the stability and strength of the connection between the concave cam and the rotating body.

[0014] In some embodiments, the concave cam and the rotating body have the same circumferential direction; the first limiting protrusion includes two circumferential limiting surfaces that face each other circumferentially, and the first limiting groove includes two circumferential limiting groove surfaces that face each other circumferentially; and the two circumferential limiting surfaces are respectively opposite to the two circumferential limiting groove surfaces. This can limit relative circumferential movement between the concave cam and the rotating body, thereby increasing the stability and strength of the connection between the concave cam and the rotating body.

[0015] In some embodiments, the first limiting protrusion and the first limiting groove form an interference fit to securely connect the concave cam and the rotating body. That is, the circumferential limiting surface and the circumferential limiting groove surface abut each other, creating a holding force between the circumferential limiting surface and the circumferential limiting groove surface. This secures the first limiting protrusion within the first limiting groove, further increasing the connection strength between the concave cam and the rotating body.

[0016] In some embodiments, the concave cam and the rotating body have axial centerlines that coincide with each other, there are multiple first limiting protrusions and multiple first limiting grooves, the multiple first limiting protrusions are spaced apart around the axial centerline, and the multiple first limiting grooves are spaced apart around the axial centerline. Thus, when the rotating body drives the concave cam to rotate around the axial centerline, the forces acting on various parts of the rotating body and the concave cam are relatively balanced.

[0017] In some embodiments, a second limiting groove is formed between two adjacent first limiting protrusions, and a second limiting protrusion is formed between two adjacent first limiting grooves; the second limiting protrusion extends into the second limiting groove to limit the circumferential and / or radial movement of the concave cam. This can further ensure a more reliable connection between the rotating body and the concave cam.

[0018] In some embodiments, the concave cam and the rotating body have the same radial direction; the first limiting groove has two radially opposing openings; the width of the first limiting protrusion gradually increases along the radial direction; and the width of the first limiting groove gradually increases to limit the radial movement of the concave cam. Thus, when the first limiting protrusion extends into the first limiting groove, the narrower end of the first limiting protrusion is located within the narrower end of the first limiting groove, and the wider end of the first limiting protrusion is located within the wider end of the first limiting groove, thereby limiting the relative radial movement of the concave cam and the rotating body.

[0019] In some embodiments, the concave cam and the rotating body have the same radial direction; the first limiting groove includes two radially opposing radial limiting groove surfaces; the first limiting protrusion includes two radially opposing radial limiting surfaces; and the two radial limiting surfaces are respectively opposed to the two radial limiting groove surfaces. This can limit relative radial movement between the concave cam and the rotating body, thereby increasing the stability and strength of the connection between the concave cam and the rotating body.

[0020] In some embodiments, the concave cam includes axially opposed concave and convex portions and a first mounting end, and the rotating body includes two axially opposed second mounting ends; the second mounting ends are provided with a third limiting protrusion, and the first mounting end is provided with a third limiting groove; or the second mounting end is provided with a third limiting groove, and the first mounting end is provided with a third limiting protrusion; the rotating body and the concave cam have the same axial direction, and the third limiting protrusion extends into the third limiting groove to limit the axial movement of the concave cam. In this way, the relative axial movement of the concave cam and the rotating body can be limited, thereby increasing the stability and strength of the connection between the concave cam and the rotating body.

[0021] In some embodiments, along the axial direction, the width of the third limiting protrusion gradually increases, and the width of the third limiting groove gradually increases.

[0022] In some embodiments, the third limiting protrusion includes two axial limiting surfaces facing each other in the axial direction, and the third limiting groove includes two axial limiting groove surfaces facing each other in the axial direction; the two axial limiting surfaces are respectively opposite to the two axial limiting groove surfaces.

[0023] In some embodiments, the concave cam and the rotating body are fixed by welding. Welding is easy to operate, simple in process, and has a strong structural strength.

[0024] In some embodiments, the concave cam and the rotating body are fixed by bonding. The bonding process is simple and easy to operate.

[0025] In some embodiments, the concave cam includes a first concave cam, which is provided with a first concave-convex portion; the rotating mechanism also includes a first mounting shaft, a first limit member, a first main elastic member and a first sliding member; the first sliding member is provided with a first matching portion; the first limit member is fixed to the first mounting shaft, the first main elastic member and the first sliding member are both slidably connected to the first mounting shaft, and the two ends of the first main elastic member respectively abut the first limit member and the first sliding member; the first concave cam and the rotating body are both rotatably connected to the first mounting shaft; along the axial direction of the first mounting shaft, the first limit member, the first main elastic member, the first sliding member, the first concave cam and the rotating body are arranged in sequence; the first concave-convex portion and the first matching portion match each other; the protrusion of the first concave-convex portion abuts the protrusion of the first matching portion, and the first main elastic member is in a compressed state; the protrusion of the first concave cam abuts the concave portion of the first matching portion, and the first main elastic member is in a pre-compressed state.

[0026] When the foldable electronic device is in the unfolded state, the rotating mechanism is in the extended state, the protrusion of the first concave cam abuts the concave portion of the first mating portion, and the first main elastic member is in a pre-compressed state. The first main elastic member remains in the pre-compressed state, providing support force to the first fixing plate and the first housing to maintain the unfolded state.

[0027] When the foldable electronic device switches from the unfolded state to the folded state, the first fixed plate rotates around the supporting base, the first swinging member slides within the first sliding groove of the first fixed plate, and the first rotating member and the first concave cam rotate around the first mounting axis. During the rotation of the first concave cam, the protrusion of the first concave cam gradually switches to abutment with the protrusion of the first mating portion, and the first sliding member gradually moves in the negative direction of the Y axis to compress one end of the first main elastic member. In other words, the first main elastic member is in a pre-compressed state to provide a damping force for the first fixed plate and the first housing. The damping force gives the foldable electronic device a better opening and closing feel.

[0028] In some embodiments, the concave cam further comprises a second concave cam, the second concave cam having a second concave-convex portion; the rotating mechanism further comprises a first pushing member and a first driving member, the first pushing member and the first driving member being fixedly connected; the first pushing member having a second mating portion; the second concave cam being rotatably connected to the first mounting shaft, the first pushing member and the first driving member both being slidably connected to the first mounting shaft; along the axial direction of the first mounting shaft, the first driving member is located between the first main elastic member and the first limit member; the second concave cam is located at an end of the rotating body away from the first concave cam, and the first pushing member is located at a side of the second concave cam away from the rotating body; the second concave-convex portion and the second mating portion are mated with each other; the first main elastic member is in a compressed state, the protrusion of the second concave-convex portion abuts the protrusion of the second mating portion; the first main elastic member is in a pre-compressed state, the protrusion of the second concave-convex portion abuts the concave portion of the second mating portion. As a result, both ends of the first main elastic member are compressed synchronously, the compression stroke of the first main elastic member is doubled, and the damping force provided by the first main elastic member to the first fixed plate and the first housing is significantly increased.

[0029] In some embodiments, there are two damping swing arms, namely a first damping swing arm and a second damping swing arm. The first damping swing arm includes a first swinging body and a first rotating body, and the second damping swing arm includes a second swinging body and a second rotating body. The outer circumference of the first rotating body is provided with a first driving tooth, and the outer circumference of the second rotating body is provided with a second driving tooth. The rotating mechanism also includes a first mounting shaft and a second mounting shaft, which are parallel and spaced apart. The first rotating body is rotationally connected to the first mounting shaft, and the second rotating body is rotationally connected to the second mounting shaft. The first driving tooth and the second driving tooth are in transmission connection. When the first shell and the first fixed plate rotate around the supporting base, the first rotating body of the first damping swing arm rotates, and the first driving tooth and the second driving tooth are in transmission connection, so that the first rotating body drives the second rotating body of the second damping swing arm to rotate. The second rotating body drives the second swinging body to slide and rotate, and the second swinging body drives the second fixed plate and the second shell to rotate, thereby achieving synchronous rotation of the first shell and the second shell.

[0030] A second aspect of the present application provides a foldable electronic device, comprising a first housing, a second housing, and a rotation mechanism according to any one of the first aspects of the present application; the rotation mechanism is connected between the first housing and the second housing. The foldable electronic device includes any of the rotation mechanisms described in the first aspect of the present application, and the technical effects of the rotation mechanism are therefore also applicable to the foldable electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] FIG1 is a schematic structural diagram of a foldable electronic device in a first state provided by an embodiment of the present application.

[0033] FIG2 is a schematic structural diagram of a foldable electronic device in a second state provided by an embodiment of the present application.

[0034] FIG3 is a schematic diagram of the split structure of the foldable electronic device shown in FIG2 .

[0035] FIG4 is a schematic diagram of a portion of the structure of the rotating mechanism of the foldable electronic device shown in FIG3 .

[0036] FIG5 is a schematic diagram of a partially enlarged structure of FIG4 .

[0037] FIG6 is a schematic structural diagram of the damping swing arm in the damping assembly of the rotating mechanism shown in FIG5 .

[0038] FIG7 is a schematic diagram of the split structure of the damping swing arm shown in FIG6 .

[0039] FIG8 is a schematic structural diagram of the concave cam of the damping swing arm shown in FIG7 .

[0040] FIG9 is a schematic structural diagram of the main body of the damping swing arm shown in FIG7 .

[0041] FIG10 is a schematic structural diagram of a first embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0042] FIG11 is a schematic structural diagram of a second embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0043] FIG12 is a schematic structural diagram of a third embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0044] FIG13 is a schematic structural diagram of a fourth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0045] FIG14 is a schematic structural diagram of a fifth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0046] FIG15 is a schematic structural diagram of a sixth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0047] FIG16 is a schematic structural diagram of a seventh embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0048] FIG17 is a schematic structural diagram of the concave cam shown in FIG16.

[0049] FIG18 is a schematic structural diagram of an eighth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG6 .

[0050] FIG19 is a schematic structural diagram of the damping assembly of the rotating mechanism shown in FIG4 .

[0051] FIG20 is a schematic diagram of the split structure of the damping assembly shown in FIG19 .

[0052] FIG21 is a partial structural schematic diagram of the rotating mechanism provided in an embodiment of the present application in an expanded state.

[0053] FIG22 is a partial structural diagram of the rotation mechanism provided in an embodiment of the present application switching from an unfolded state to a folded state.

[0054] Figure 23 is a partial structural schematic diagram of the rotating mechanism provided in an embodiment of the present application in a folded state. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0056] 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.

[0057] 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 inward-folding mobile phone as an example for description. An inward-folding mobile phone is a mobile phone in which the display screen 300 is on the inside after folding.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] It should be noted that the directional terms such as "top", "bottom", "left", "right", "front" and "back" used in the embodiments 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 4. The direction facing the positive direction of the Z axis is "top" and "top", the direction facing the negative direction of the Z axis is "bottom" and "bottom", the direction facing the positive direction of the X axis is "right", the direction facing the negative direction of the X axis is "left", the direction facing the positive direction of the Y axis is "back", and the direction facing the negative direction of the Y axis is "front". It does not constitute a limitation on the orientation of the foldable electronic device 1000 in actual application scenarios. In the embodiments of the present application, A and / or B refer to the three schemes of A, B, and A and B.

[0064] 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 side of the first shell 210 facing the second shell 220, that is, the first display unit 310 is located on the inner side of the first shell 210; the second display unit 320 is located on the side of the second shell 220 facing the first shell 210, that is, the second display unit 320 is located on the inner side of the second shell 220. 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.

[0065] Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the split structure of the foldable electronic device 1000 shown in Figure 2, and Figure 4 is a schematic diagram of a portion of the structure of the rotation mechanism 100 of the foldable electronic device 1000 shown in Figure 3. Figure 3 shows the foldable electronic device 1000 in an unfolded state, and Figure 4 shows the rotation mechanism 100 in an unfolded state. In this embodiment, the rotation mechanism 100 includes a supporting base 400, a first fixing plate 500, a second fixing plate 600, and a damping 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 damping 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 supporting base 400 includes a shaft cover and a shielding plate. When the phone is in the folded state, the shaft cover serves as the phone's exterior component. The shielding plate is fixed to the shaft cover to shield components mounted thereon. The shielding plate also supports the display screen 300.

[0066] During the rotation of the foldable electronic device 1000, the damping assembly 110 provides a damping force, allowing users to experience a better damping feel while enabling the foldable electronic device 1000 to hover at a preset angle, thereby enhancing the user experience. The "preset angle" here refers to the angle between the first housing 210 and the second housing 220 when the foldable electronic device 1000 is hovering, that is, the angle between the first fixing plate 500 and the second fixing plate 600. The preset angle ranges from 0 to 180 degrees.

[0067] Specifically, in the rotating mechanism 100, the first fixed plate 500 is fixed to the first shell 210, and the second fixed plate 600 is fixed to the second shell 220. When the first fixed plate 500 and the first shell 210 rotate around the supporting base 400, the damping assembly 110 provides damping force for the first fixed plate 500 and the first shell 210. When the second fixed plate 600 and the second shell 220 rotate around the supporting base 400, the damping assembly 110 provides damping force for the second fixed plate 600 and the second shell 220.

[0068] The number of the damping components 110 may be two, three, four or five, etc. The plurality of damping components 110 are installed on the supporting base 400 in sequence and at intervals along the Y-axis direction.

[0069] Please refer to Figures 5, 6 and 7. Figure 5 is a partially enlarged structural diagram of Figure 4. Figure 6 is a structural diagram of the damping swing arm 10 in the damping assembly 110 of the rotating mechanism 100 shown in Figure 5, and Figure 7 is a schematic diagram of the split structure of the damping swing arm 10 shown in Figure 6. The damping assembly 110 includes a damping swing arm 10, and the damping swing arm 10 includes a body 20 and a concave cam 30; the body 20 includes a swinging body 21 and a rotating body 22. Along the length direction of the damping swing arm 10, the length direction of the damping swing arm 10 is the X-axis direction, and the swinging body 21 and the rotating body 22 are fixedly connected; along the width direction of the damping swing arm 10, the width direction of the damping swing arm 10 is the Y-axis direction, and the concave cam 30 and the rotating body 22 are coaxially fixedly connected.

[0070] There are two damping swing arms 10, and the rotating bodies 22 and concave cams 30 of both damping swing arms 10 are rotatably mounted on the support base 400. The swinging body 21 of one damping swing arm 10 is slidably and rotatably connected to the first fixed plate 500, while the swinging body 21 of the other damping swing arm 10 is slidably and rotatably connected to the second fixed plate 600. Taking the swinging body 21 slidingly and rotatably connected to the first fixed plate 500 as an example, when the first fixed plate 500 and the first housing 210 rotate about the support base 400, the swinging body 21 slides relative to the first fixed plate 500 while also rotating around the support base 400, causing both the rotating body 22 and the concave cam 30 to rotate. The concave cam 30's rotation can cause wear from contact with adjacent components, and the swinging body 21 is subject to significant forces when the phone is folded or dropped from a height.

[0071] In this embodiment, the main body 20 has a first Rockwell hardness, and the concave cam 30 has a second Rockwell hardness, and the second Rockwell hardness is greater than the first Rockwell hardness. Rockwell hardness is an indicator that determines the hardness value by the depth of plastic deformation of the indentation. When testing the actual hardness of a metal material, the test method is to use a diamond cone or a steel ball to press into the metal material being tested under a certain load, and the hardness of the material is calculated from the indentation depth. The shallower the indentation depth, the less likely the material is to be scratched, the greater the Rockwell hardness of the material, and the better the wear resistance of the material. The deeper the indentation depth, the easier the material is to be scratched, the smaller the Rockwell hardness of the material, and the worse the wear resistance of the material.

[0072] Specifically, the body 20 and the concave cam 30 can be machined separately and then fixed together to form a single structure. This facilitates the use of different materials for the body 20 and the concave cam 30. The body 20 can be made of a material having a first Rockwell hardness, while the concave cam 30 can be made of a material having a second Rockwell hardness. For example, the body 20 can be made of G18 steel, while the concave cam 30 can be made of SKD-11 steel.

[0073] In the related art, the main body 20 and the concave cam 30 are integrally formed using the same material. However, the main body 20 is mainly subjected to greater force when the mobile phone switches between the folded state and the unfolded state, and is also subjected to greater force when the mobile phone falls from a height. The concave cam 30 is mainly subjected to mutual wear and tear between adjacent parts when the mobile phone switches between the unfolded state and the folded state, that is, the concave cam 30 is mainly subjected to wear force. When the main body 20 and the concave cam 30 are integrally formed using the same material, currently only the force requirements of the main body 20 can be met, and the force requirements of the concave cam 30 cannot be met, resulting in severe wear of the concave cam 30, which in turn will cause the damping force during the opening and closing process of the foldable electronic device 1000 to decrease, resulting in a reduced opening and closing feel.

[0074] In the embodiment of the present application, the concave cam 30 and the body 20 are made of different materials. Furthermore, the Rockwell hardness of the concave cam 30 is greater than that of the body 20, which enhances the wear resistance of the concave cam 30 and enables it to withstand greater wear forces. This ensures a more stable damping force during the opening and closing of the foldable electronic device 1000, ensuring a smooth opening and closing experience.

[0075] In addition, since the wear resistance requirement of the body 20 is lower than that of the concave cam 30 , the body 20 is made of a material having a lower Rockwell hardness than that of the concave cam 30 .

[0076] In some embodiments, the first Rockwell hardness A1 satisfies the following condition: A1 ≥ a, and the second Rockwell hardness A2 satisfies the following condition: A2 < a, wherein 50 HRC ≥ a ≥ 45 HRC. Specifically, a can be 45 HRC, 46 HRC, 47 HRC, 48 HRC, 50 HRC, 53 HRC, 56 HRC, 65 HRC, 70 HRC, 75 HRC, 77 HRC, 80 HRC, 90 HRC, or 100 HRC, etc., and is not limited in this application.

[0077] In some embodiments, the body 20 has a first yield strength, and the concave cam 30 has a second yield strength, which is less than the first yield strength. Yield strength is the yield limit of a metal material, or the stress at which the metal resists minimal plastic deformation. If a metal material is subjected to an external force greater than its yield strength, it will undergo permanent, irreversible deformation.

[0078] Since the main body 20 is mainly subjected to greater forces when the foldable electronic device 1000 switches between the folded state and the unfolded state, and is also subjected to greater forces when the foldable electronic device 1000 falls from a height, that is, the main body 20 is mainly subjected to bending stress and falling force. The concave cam 30 is mainly subjected to mutual wear between the foldable electronic device 1000 and adjacent parts when switching between the unfolded state and the folded state, that is, the concave cam 30 is mainly subjected to wear force. Therefore, the yield strength of the main body 20 and the concave cam 30 is not the same. In this embodiment, the concave cam 30 and the main body 20 are made of different materials, and the yield strength of the main body 20 is greater than the yield strength of the concave cam 30, thereby allowing the main body 20 to withstand greater falling forces and reducing the risk of the main body breaking. The concave cam 30 can be made of a material with a lower yield strength.

[0079] In other embodiments, the first yield strength may be set to be greater than or equal to the second yield strength, as long as the force requirements of the body 20 and the concave cam 30 are met.

[0080] In some embodiments, the body 20 and the concave cam 30 may be fixedly connected by bonding or welding.

[0081] Specifically, please refer to Figure 8, which is a schematic diagram of the structure of the concave cam 30 of the damping swing arm 10 shown in Figure 7. The concave cam 30 is provided with a through hole 31, which includes a first inner wall surface 32, a first outer wall surface 33, a first mounting end 34, and a concave-convex portion 35. The through hole 31 extends through the concave cam 30 along the Y-axis. The first inner wall surface 32 is the hole wall surface of the through hole 31, and the first outer wall surface 33 is opposite to the first inner wall surface 32. The first mounting end 34 and the concave-convex portion 35 are located at opposite ends of the concave cam 30 along the Y-axis. The first mounting end 34 is connected to one side of the first inner wall surface 32 and the first outer wall surface 33, respectively, while the concave-convex portion 35 is connected to the other side of the first inner wall surface 32 and the first outer wall surface 33, respectively. The concave-convex portion 35 includes a plurality of protrusions and a plurality of recesses, which are alternately arranged around the axial centerline of the concave cam 30.

[0082] Please refer to Figure 9, which is a schematic structural diagram of the main body 20 of the damping swing arm 10 shown in Figure 7. The rotating body 22 is provided with a rotating hole 23, and the rotating body 22 includes a second inner wall surface 24, a second outer wall surface 25, and two second mounting ends 26. Along the Y-axis direction, the rotating hole 23 passes through the rotating body 22, the second inner wall surface 24 is the hole wall surface of the rotating hole 23, the second outer wall surface 25 is opposite to the first inner wall surface 32, and the two second mounting ends 26 are located at opposite ends of the rotating body 22 along the Y-axis direction, and the two sides of one of the second mounting ends 26 are respectively connected to one side of the second inner wall surface 24 and the second outer wall surface 25, and the two sides of the other second mounting end 26 are respectively connected to the other side of the second inner wall surface 24 and the second outer wall surface 25.

[0083] The main body 20 and the concave cam 30 are fixedly connected. Specifically, the first mounting end 34 of the concave cam 30 and the second mounting end 26 of the rotating body 22 are fixedly connected by bonding or welding. In other words, the concave cam 30 is connected to both opposing ends of the rotating body 22. After the main body 20 and the concave cam 30 are fixedly connected, the rotating body 22 and the concave cam 30 are coaxial, and the rotating body 22 and the concave cam 30 have the same radial direction and the same circumferential direction. The through hole 31 and the rotating hole 23 are opposite and connected, and the through hole 31 and the rotating hole 23 are coaxial.

[0084] In some embodiments, please refer to Figure 10, which is a structural diagram of the first embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in Figure 6. A limiting structure can also be provided between the main body 20 and the concave cam 30, and the limiting structure can be a structure in which a limiting protrusion and a limiting groove cooperate. Specifically, the second mounting end 26 of the rotating body 22 is provided with a first limiting groove 27, and the first mounting end 34 of the concave cam 30 is provided with a first limiting protrusion 36. The first limiting protrusion 36 is convexly provided on the first mounting end 34 of the concave cam 30, and the first limiting groove 27 is concavely provided on the second mounting end 26 of the rotating body 22. The first limiting protrusion 36 extends into the first limiting groove 27 to limit the circumferential and / or radial movement of the concave cam 30.

[0085] Several solutions for the first limiting protrusion 36 and the first limiting groove 27 to cooperate with each other to limit the circumferential and / or radial movement of the concave cam 30 are described in detail below.

[0086] In a first specific embodiment, referring to FIG10 , the first limiting protrusion 36 can be a rectangular protrusion, and the first limiting groove 27 can be a rectangular groove. The first limiting groove 27 has two openings radially opposite to each other along the concave cam 30. The first limiting protrusion 36 can include two circumferential limiting surfaces 361 circumferentially opposed to each other along the circumference of the concave cam 30, and the first limiting groove 27 can include two circumferential limiting groove surfaces 271 circumferentially opposed to each other along the circumference of the rotating body 22, with the two circumferential limiting surfaces 361 facing each other. This can limit the relative circumferential movement of the concave cam 30 and the rotating body 22, thereby increasing the stability and strength of the connection between the concave cam 30 and the rotating body 22.

[0087] The circumferential limiting surface 361 and the circumferential limiting groove surface 271 may be clearance-fitted or transition-fitted to increase the convenience of installing the first limiting protrusion 36 in the first limiting groove 27 .

[0088] The circumferential limiting surface 361 and the circumferential limiting groove surface 271 may also be interference-fitted to securely connect the concave cam 30 and the rotating body 22. That is, the circumferential limiting surface 361 and the circumferential limiting groove surface 271 abut against each other, creating a holding force between the circumferential limiting surface 361 and the circumferential limiting groove surface 271. This secures the first limiting protrusion 36 within the first limiting groove 27, effectively limiting relative movement of the concave cam 30 and the rotating body 22 in the circumferential, radial, and axial directions, further increasing the connection strength between the concave cam 30 and the rotating body 22.

[0089] Specifically, when the first limiting protrusion 36 is installed in the first limiting groove 27, the principle of thermal expansion and contraction can be utilized to achieve an interference fit between the first limiting protrusion 36 and the first limiting groove 27. Specifically, the concave cam 30 and the rotating body 22 can be placed in a cooling device such as a refrigerator for cooling. After the concave cam 30 cools, the first limiting protrusion 36 contracts, and the distance between the two circumferential limiting surfaces 361 decreases. After the rotating body 22 cools, the distance between the two circumferential limiting groove surfaces 271 increases. At this point, the first limiting protrusion 36 can easily extend into the first limiting groove 27. Next, the concave cam 30 and the rotating body 22 are heated again. The first limiting protrusion 36 expands upon heating, and the distance between the two circumferential limiting surfaces 361 increases. The distance between the two circumferential limiting groove surfaces 271 also increases, thereby causing the circumferential limiting surface 361 to abut against the circumferential limiting groove surface 271.

[0090] In a second specific embodiment, please refer to FIG11 , which is a schematic structural diagram of a second embodiment of the coupling between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in FIG6 . The first limiting protrusion 36 may be an arcuate protrusion extending in the same direction as the circumference of the concave cam 30. The first limiting groove 27 may be an arcuate groove extending in the same direction as the circumference of the rotating body 22. The first limiting protrusion 36 may include two radial limiting surfaces 362 radially opposed to each other along the concave cam 30, and the first limiting groove 27 may include two radial limiting groove surfaces 272 radially opposed to each other along the rotating body 22. The two radial limiting surfaces 362 are opposed to the two radial limiting groove surfaces 272, respectively. A small gap may be provided between the radial limiting surfaces 362 and the radial limiting side surfaces, or they may be in direct contact. This restricts radial relative movement between the concave cam 30 and the rotating body 22, thereby increasing the stability and strength of the connection between the concave cam 30 and the rotating body 22.

[0091] The radial limiting surface 362 and the radial limiting groove surface 272 may be clearance-fitted or transition-fitted, so as to increase the convenience of installing the first limiting protrusion 36 in the first limiting groove 27 .

[0092] The radial limiting surface 362 and the radial limiting groove surface 272 may also form an interference fit, thereby securing the concave cam 30 and the rotating body 22. That is, the radial limiting surface 362 and the radial limiting groove surface 272 abut against each other, creating a holding force between the radial limiting surface 362 and the radial limiting groove surface 272. This secures the first limiting protrusion 36 within the first limiting groove 27, effectively limiting relative movement of the concave cam 30 and the rotating body 22 in the circumferential, radial, and axial directions, further increasing the connection strength between the concave cam 30 and the rotating body 22.

[0093] The interference fit between the radial limiting surface 362 and the radial limiting groove surface 272 is achieved by referring to the interference fit between the circumferential limiting surface 361 and the circumferential limiting groove surface 271 , which will not be described in detail.

[0094] In a third embodiment, please refer to FIG12 , which is a schematic structural diagram of a third embodiment of the coupling between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in FIG6 . The first limiting protrusion 36 can be a rectangular protrusion, and the first limiting groove 27 can be a rectangular groove. The first limiting protrusion 36 includes two circumferential limiting surfaces 361 that face each other circumferentially relative to the concave cam 30, and two radial limiting surfaces 362 that face each other radially relative to the concave cam 30. The first limiting groove 27 includes two circumferential limiting groove surfaces 271 that face each other circumferentially relative to the rotating body 22, and two radial limiting groove surfaces 272 that face each other radially relative to the rotating body 22. The two circumferential limiting surfaces 361 oppose the two circumferential limiting groove surfaces 271, respectively, to limit circumferential relative rotation of the concave cam 30 and the rotating body 22. The two radial limiting surfaces 362 oppose the two radial limiting groove surfaces 272, respectively, to limit radial relative movement of the concave cam 30 and the rotating body 22.

[0095] The circumferential limiting surface 361 and the circumferential limiting groove surface 271 can have a clearance fit or a transition fit, and the radial limiting surface 362 and the radial limiting groove surface 272 can have a clearance fit or a transition fit, so as to increase the convenience of installing the first limiting protrusion 36 in the first limiting groove 27. The circumferential limiting surface 361 and the circumferential limiting groove surface 271 can also have an interference fit, and the radial limiting surface 362 and the radial limiting groove surface 272 can also have an interference fit. There is a holding force between the circumferential limiting surface 361 and the circumferential limiting side surface, and there is also a holding force between the radial limiting surface 362 and the radial limiting side surface, so as to provide a more stable connection between the concave cam 30 and the rotating body 22.

[0096] In other embodiments, the second mounting end 26 of the rotating body 22 is provided with a first limiting protrusion 36, and the first mounting end 34 of the concave cam 30 is provided with a first limiting groove 27. The first limiting groove 27 is recessed in the first mounting end 34 of the concave cam 30, and the first limiting protrusion 36 is protruded from the second mounting end 26 of the rotating body 22. The manner in which the first limiting protrusion 36 and the first limiting groove 27 cooperate with each other is the same as in the above-mentioned embodiment and will not be further described.

[0097] In some embodiments, please refer to FIG13 , which is a schematic structural diagram of the fourth embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in FIG6 . There are multiple first limiting protrusions 36 and multiple first limiting grooves 27 . Multiple first limiting protrusions 36 are arranged at intervals around the axial center line, and multiple first limiting grooves 27 are arranged at intervals around the axial center line. Here, multiple means more than two, for example: two, three, four, five or six, etc. As a result, when the swinging body 21 drives the rotating body 22 to rotate around the axial center line, and the rotating body 22 then drives the concave cam 30 to rotate around the axial center line, the forces on various parts of the rotating body 22 and the concave cam 30 are relatively balanced.

[0098] Furthermore, when multiple first limiting protrusions 36 and first limiting grooves 27 are provided, correspondingly, a second limiting groove 37 is formed between two adjacent first limiting protrusions 36, and a second limiting protrusion 28 is formed between two adjacent first limiting grooves 27. The second limiting protrusion 28 extends into the second limiting groove 37 to limit the circumferential and / or radial movement of the concave cam 30. The structure and mating method of the second limiting protrusion 28 and the second limiting groove 37 refer to the first limiting protrusion 36 and the first limiting groove, and will not be further described. This ensures a more secure connection between the rotating body 22 and the concave cam 30.

[0099] In addition, when multiple first limiting protrusions 36 and first limiting grooves 27 are provided, even if the first limiting protrusions 36 and the first limiting grooves 27 only have the circumferential limiting surface 361 and the circumferential limiting groove surface 271 to cooperate with each other, radial limiting of the concave cam 30 and the rotating body 22 can be achieved by changing the width dimensions of the first limiting protrusions 36 and the first limiting grooves 27.

[0100] Several solutions for cooperating between the plurality of first limiting protrusions 36 and the plurality of first limiting grooves 27 to limit the circumferential and / or radial movement of the concave cam 30 are described in detail below.

[0101] In the fourth specific embodiment, please refer to Figure 13. To more clearly illustrate the distribution of the first limiting protrusions 36 and the first limiting grooves 27, the angle of the concave cam 30 in Figure 13 is different from the angle of the main body 200. Similar situations appear in subsequent figures and are explained in the same way. The first mounting end 34 of the concave cam 30 is provided with three first limiting protrusions 36. The three first limiting protrusions 36 are arranged at intervals around the axial centerline of the concave cam 30, and a second limiting groove 37 is formed between any two adjacent first limiting protrusions 36. The second mounting end 26 of the rotating body 22 is provided with three first limiting grooves 27. The three first limiting grooves 27 are arranged at intervals around the axial centerline of the rotating body 22, and a second limiting protrusion 28 is formed between any two adjacent first limiting grooves 27.

[0102] The first limiting protrusion 36 includes two circumferential limiting surfaces 361 that are opposite to each other along the circumference of the concave cam 30, and the first limiting groove 27 includes two circumferential limiting groove surfaces 271 that are opposite to each other along the circumference of the rotating body 22. The two circumferential limiting surfaces 361 are respectively opposite to the two circumferential limiting groove surfaces 271 to limit the relative rotation of the concave cam 30 and the rotating body 22 in the circumferential direction.

[0103] Furthermore, the width of the first limiting protrusion 36 gradually increases along the radial direction of the concave cam 30, with the width direction of the first limiting protrusion 36 being roughly parallel to the circumference of the concave cam 30, that is, the first limiting protrusion 36 is fan-shaped. Specifically, the width of the first limiting protrusion 36 gradually increases from the first inner wall surface 32 toward the first outer wall surface 33. The first limiting groove 27 has two radially opposing openings. The width of the first limiting groove 27 gradually increases along the radial direction of the rotating body 22, with the width direction of the first limiting groove 27 being roughly parallel to the circumference of the rotating body 22, that is, the first limiting groove 27 is fan-shaped. As a result, when the first limiting protrusion 36 extends into the first limiting groove 27, the narrower end of the first limiting protrusion 36 is located within the narrower end of the first limiting groove 27, and the wider end of the first limiting protrusion 36 is located within the wider end of the first limiting groove 27, thereby limiting the relative radial movement of the concave cam 30 and the rotating body 22.

[0104] The structures and matching methods of the second limiting protrusion 28 and the second limiting groove 37 refer to the first limiting protrusion 36 and the first limiting groove, and are not described in detail again.

[0105] In the fifth embodiment, please refer to FIG14 , which is a schematic structural diagram of the fifth embodiment of the coupling between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in FIG6 . The first mounting end 34 of the concave cam 30 is provided with six first position-limiting protrusions 36 . These six first position-limiting protrusions 36 are spaced apart around the axial centerline of the concave cam 30 , with a second position-limiting groove 37 formed between any two adjacent first position-limiting protrusions 36 . Three of the six first position-limiting protrusions 36 are fan-shaped protrusions 36A, and the other three are rectangular protrusions 36B. The fan-shaped protrusions 36A and the rectangular protrusions 36B are arranged alternately along the circumference of the concave cam 30 .

[0106] The second mounting end 26 of the rotating body 22 is provided with six first retaining grooves 27. These six first retaining grooves 27 are spaced apart around the axial centerline of the rotating body 22, and a second retaining protrusion 28 is formed between any two adjacent first retaining grooves 27. Three of the six first retaining grooves 27 are fan-shaped grooves 27A, and the other three are rectangular grooves 27B. The fan-shaped grooves 27A and rectangular grooves 27B are arranged alternately along the circumference of the rotating body 22.

[0107] The structure and coordination of the sector-shaped protrusion 36A and the sector-shaped groove 27A are identical to those of the first embodiment described above and will not be further described. The sector-shaped protrusion 36A and the sector-shaped groove 27A cooperate to restrict the relative movement of the concave cam 30 and the rotating body 22 in the circumferential and radial directions, thereby increasing the stability of the connection between the concave cam 30 and the rotating body 22.

[0108] In this embodiment, the structure and coordination of the rectangular protrusion 36B and the rectangular groove 27B are identical to those of the third embodiment described above, and are not further described. The coordination of the rectangular protrusion 36B and the rectangular groove 27B restricts the relative circumferential and radial movement of the concave cam 30 and the rotating body 22, further enhancing the stability of the connection between the concave cam 30 and the rotating body 22.

[0109] Furthermore, the six first limiting protrusions 36 cooperate with the six first limiting grooves 27 so that the forces on the concave cam 30 and the rotating body 22 are more balanced.

[0110] In the sixth embodiment, please refer to FIG. 15 , which is a schematic structural diagram of the sixth embodiment of the engagement between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in FIG. Six first retaining grooves 27 are defined on the first mounting end 34 of the concave cam 30. These six first retaining grooves 27 are spaced apart around the axial centerline of the concave cam 30. The six first retaining protrusions 36 are each fan-shaped protrusions 36A. The side surfaces 383 of three fan-shaped protrusions 36A are flush with the second outer wall 25, while the side surfaces 383 of the other three fan-shaped protrusions 36A are flush with the second inner wall 24.

[0111] The second mounting end 26 of the rotating body 22 is provided with six first position-limiting protrusions 36, which are spaced apart around the axial centerline of the rotating body 22. The six first position-limiting grooves 27 are all fan-shaped grooves 27A, three of which have openings extending through the first inner wall surface 32, and the other three have openings extending through the first outer wall surface 33.

[0112] The two types of sector-shaped protrusions 36A are alternately arranged along the circumference of the concave cam 30 , and the two types of sector-shaped grooves 27A are alternately arranged along the circumference of the rotating body 22 , so that the force is more uniform after the concave cam 30 and the rotating body 22 are connected.

[0113] In some embodiments, please refer to FIG. 16 , which is a schematic structural diagram of a seventh embodiment of the coupling between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in FIG. A third limiting groove 29 is provided at the second mounting end 26 of the rotating body 22, and a third limiting protrusion 38 is provided at the first mounting end 34 of the concave cam 30. The third limiting protrusion 38 extends into the third limiting groove 29 to limit the axial movement of the concave cam 30. Specifically, the third limiting protrusion 38 is provided protrudingly on the first mounting end 34 of the concave cam 30, while the third limiting groove 29 is provided concavely on the second mounting end 26 of the rotating body 22.

[0114] Several solutions for the third limiting protrusion 38 and the third limiting groove 29 to cooperate with each other to limit the relative movement of the concave cam 30 and the rotating body 22 along the axial direction are described in detail below.

[0115] In a seventh embodiment, please refer to Figures 16 and 17. Figure 17 is a schematic diagram of the structure of the concave cam 30 shown in Figure 16. The third limiting protrusion 38 is an arc-shaped protrusion, and the extension direction of the third limiting protrusion 38 is the same as the circumferential direction of the concave cam 30. The width of the third limiting protrusion 38 gradually increases along the axial direction of the concave cam 30. Specifically, the third limiting protrusion 38 includes a top surface 381, a bottom surface 382, ​​and two side surfaces 383. The bottom surface 382 is fixedly connected to the first mounting end 34 of the concave cam 30, and the bottom surface 382 faces away from the top surface 381. The two side surfaces 383 are connected between the top surface 381 and the bottom surface 382. The width of the top surface 381 is greater than that of the bottom surface 382, ​​and both side surfaces 383 are inclined relative to the axial direction of the concave cam 30. In other words, the cross-section of the third limiting protrusion 38 along the axial direction of the concave cam 30 is trapezoidal.

[0116] The third limiting groove 29 is an arc-shaped groove, and the extension direction of the third limiting groove 29 is the same as the circumferential direction of the rotating body 22. Along the axial direction of the rotating body 22, the width of the third limiting groove 29 gradually increases. Specifically, the third limiting groove 29 includes a groove bottom surface, two groove side surfaces and a notch. Along the axial direction of the rotating body 22, the groove bottom surface and the notch are opposite. The two groove side surfaces are respectively connected to the groove bottom surface. The width of the notch of the third limiting groove 29 is greater than the width of the groove bottom surface, and both groove side surfaces are inclined relative to the axial direction of the rotating body 22. That is, the cross-section of the third limiting groove 29 along the axial direction of the rotating body 22 is trapezoidal.

[0117] When assembling the concave cam 30 and the rotating body 22, first, the first mounting end 34 of the concave cam 30 and the second mounting end 26 of the rotating body 22 are brought into contact with each other, and the concave cam 30 and the rotating body 22 are made coaxial. Then, the concave cam 30 is rotated along its circumferential direction so that the third limiting protrusion 38 extends into the third limiting groove 29. This restricts the relative movement of the concave cam 30 and the rotating body 22 in the axial direction.

[0118] In the embodiment of the present application, the three third limiting protrusions 38 are respectively connected to the three first limiting protrusions 36. When assembling the concave cam 30 and the rotating body 22, the three first limiting protrusions 36 are first respectively extended into the three first limiting grooves 27. Then, the concave cam 30 is rotated in the circumferential direction so that the three third limiting protrusions 38 are respectively extended into the three third limiting grooves 29. At this time, the first limiting protrusions 36 still maintain the engagement with the first limiting grooves 27. The engagement method of the first limiting protrusions 36 and the first limiting grooves 27 is referred to the above embodiment and will not be repeated here.

[0119] In the eighth embodiment, please refer to Figure 18 , which is a schematic structural diagram of the eighth embodiment of the engagement between the rotating body 22 and the concave cam 30 of the damping swing arm 10 shown in Figure 6 . The concave cam 30 is provided with three third limiting protrusions 38 , which are respectively connected to the three first limiting protrusions 36 , with a gap between the third limiting protrusions 38 and the first mounting end 34 . The third limiting protrusion 38 includes two axially opposed limiting surfaces 384 , one of which faces the first mounting end 34 .

[0120] The rotating body 22 is provided with three third limiting grooves 29, which are respectively recessed into the side surfaces of the three second limiting protrusions 28. Furthermore, the third limiting grooves 29 include two axially opposing axial limiting groove surfaces (not shown). This can be understood as enclosing the notch of the third limiting groove 29 opposite the second mounting end 26 in the first embodiment described above via the axial limiting groove surfaces, which are opposed to the bottom surface of the third limiting groove 29.

[0121] When assembling the concave cam 30 and the rotating body 22, first, the three first limiting protrusions 36 are respectively extended into the three first limiting grooves 27, and then the concave cam 30 is rotated circumferentially so that the three third limiting protrusions 38 are respectively extended into the three third limiting grooves 29. At this time, the first limiting protrusions 36 still maintain a mating state with the first limiting grooves 27. The mating method of the first limiting protrusions 36 and the first limiting grooves 27 refers to the above embodiment and is not repeated here. The two axial limiting surfaces 384 are respectively opposite to the two axial limiting groove surfaces. The axial limiting surfaces 384 and the axial limiting groove surfaces can be clearance fit, transition fit, or interference fit. In this way, the relative axial movement of the concave cam 30 and the rotating body 22 can be limited.

[0122] In some embodiments, please refer to Figures 19 and 20. Figure 19 is a schematic diagram of the structure of the damping assembly 110 of the rotating mechanism 100 shown in Figure 4, and Figure 20 is a schematic diagram of the split structure of the damping assembly 110 shown in Figure 19. As mentioned above, the damping assembly 110 includes the damping swing arm 10. In practice, the damping assembly 110 also includes a mounting shaft 40, a stopper 50, a primary elastic member 60, a sliding member 70, a pushing member 80, a driving member 90, an auxiliary elastic member 63, and a connecting shaft 64. The primary elastic member 60 and the auxiliary elastic member 63 can each be a spring or rubber member. There are two mounting shafts 40, a stopper 50, a primary elastic member 60, a sliding member 70, a pushing member 80, and a driving member 90. The two mounting shafts 40 are respectively a first mounting shaft 41 and a second mounting shaft 42. The two stoppers 50 are respectively a first stopper 51 and a second stopper 52. The two primary elastic members 60 are respectively a first primary elastic member 61 and a second primary elastic member 62. The two sliding members 70 are respectively a first sliding member 71 and a second sliding member 72, and the first sliding member 71 and the second sliding member 72 are fixedly connected by a first connecting member 73. The two pushing members 80 are respectively a first pushing member 81 and a second pushing member 82, and the first pushing member 81 and the second pushing member 82 are fixedly connected by a second connecting member 83. There are two driving members 90, and the two driving members 90 are respectively a first driving member 91 and a second driving member 92, and the first driving member 91 and the second driving member 92 are fixedly connected by a third connecting member 93. The third connecting member 93 and the second connecting member 83 are fixedly connected by a fourth connecting member (not shown).

[0123] There are two damping swing arms 10, namely a first damping swing arm 10A and a second damping swing arm 10B. The main body 20 of the first damping swing arm 10A is the first main body 20A, the swinging body 21 of the first damping swing arm 10A is the first swinging body 21A, and the rotating body 22 of the first damping swing arm 10A is the first rotating body 22A. The first damping swing arm 10A has two concave cams 30, namely the first concave cam 30A and the second concave cam 30B. The main body 20 of the second damping swing arm 10B is the second main body 20B, the swinging body 21 of the second damping swing arm 10B is the second swinging body 21B, and the rotating body 22 of the second damping swing arm 10B is the second rotating body 22B. The second damping swing arm 10B has two concave cams 30, namely the third concave cam 30C and the fourth concave cam 30D.

[0124] The first concave cam 30A has a first concave-convex portion, the second concave cam 30B has a second concave-convex portion, the third concave cam 30C has a third concave-convex portion, and the fourth concave cam 30D has a fourth concave-convex portion. The first sliding member 71 has a first mating portion 221, the first pushing member 81 has a second mating portion, the second sliding member 72 has a third mating portion, and the second pushing member 82 has a fourth mating portion. The first to fourth concave-convex portions and the first to fourth mating portions all include alternating recesses and projections.

[0125] The first damping swing arm 10A, the first mounting shaft 41 , the first limiting member 51 , the first main elastic member 61 , and the first sliding member 71 cooperate to provide damping force to the first fixing plate 500 and the first housing 210 .

[0126] Specifically, please refer to Figure 21, which is a schematic diagram of a portion of the structure of the rotation mechanism 100 provided in an embodiment of the present application in an expanded state. The first fixed plate 500 (not shown) is provided with a first chute (not shown), and the shaft cover is provided with a mounting groove (not shown). The first swinging member 21A of the first damping swing arm 10A is slidably connected to the first chute of the first fixed plate 500, and the first mounting shaft 41 is fixed to the mounting groove of the shaft cover. The axial direction of the first mounting shaft 41 is parallel to the Y-axis direction.

[0127] The first stopper 51 is fixed to the first mounting shaft 41. The first primary elastic member 61 and the first sliding member 71 are both slidably connected to the first mounting shaft 41, with both ends of the first primary elastic member 61 abutting the first stopper 51 and the first sliding member 71, respectively. The first concave cam 30A and the first rotating body 22A are both rotatably connected to the first mounting shaft 41. Along the axial direction of the first mounting shaft 41, the first stopper 51, the first primary elastic member 61, the first sliding member 71, the first concave cam 30A, and the first rotating body 22A are arranged in sequence. The first concave-convex portion engages with the first mating portion 221.

[0128] It is understood that the first stopper 51 may be a retaining spring fixedly engaged with the first stopper 51. The first primary elastic member 61 may be a spring slidably mounted on the first mounting shaft 41. The first sliding member 71 has a through-hole extending along the Y-axis. The first mounting shaft 41 passes through the through-hole of the first sliding member 71, the through-hole 31 of the first concave cam 30A, and the rotation hole 23 of the rotating body 22, so that the first sliding member 71 is slidably connected to the first mounting shaft 41. The first concave cam 30A and the rotating body 22 are both rotationally connected to the first mounting shaft 41.

[0129] When the foldable electronic device 1000 is in the unfolded state, the rotating mechanism 100 is in the unfolded state, the protrusion of the first concave-convex portion of the first concave cam 30A abuts the concave portion of the first mating portion 221, and the first primary elastic member 61 is in a pre-compressed state. During this time, the first primary elastic member 61 remains in the pre-compressed state, providing support for the first fixing plate 500 and the first housing 210 to maintain the unfolded state.

[0130] When the foldable electronic device 1000 switches from the unfolded state to the folded state, please refer to FIG22 , which is a schematic diagram of a portion of the structure of the rotating mechanism 100 provided in an embodiment of the present application switching from the unfolded state to the folded state. The first fixed plate 500 rotates around the supporting base 400, the first swinging member 21A slides within the first sliding groove of the first fixed plate 500, and the first rotating member 22A and the first concave cam 30A rotate around the first mounting shaft 41. During the rotation of the first concave cam 30A, the protrusion of the first concave-convex portion of the first concave cam 30A gradually switches to abutment with the protrusion of the first mating portion 221. The first sliding member 71 gradually moves in the negative direction of the Y axis to compress one end of the first primary elastic member 61. That is, the first primary elastic member 61 is in a pre-compressed state to provide a damping force for the first fixed plate 500 and the first housing 210.

[0131] When the foldable electronic device 1000 is in the folded state, please refer to Figure 23, which is a schematic diagram of a portion of the structure of the rotation mechanism 100 provided by an embodiment of the present application in the folded state. In the folded state, the protrusion of the first concave-convex portion of the first concave cam 30A abuts the concave portion of the first mating portion 221, and the first primary elastic member 61 returns to its pre-compressed state, providing support force to maintain the first fixing plate 500 and the first housing 210 in the folded state.

[0132] As can be seen above, during movement, the first concave cam 30A primarily contacts the first mating portion, causing wear. If the first concave-convex portion of the first concave cam 30A is severely worn, the movement stroke of the first sliding member 71 along the negative Y-axis direction will be too short, which in turn shortens the compression stroke of the first primary elastic member 61. Consequently, the damping force provided by the first primary elastic member 61 will decrease.

[0133] In the embodiment of the present application, the first concave cam 30A is provided with good wear resistance, thereby reducing the degree of wear when the first concave-convex portion of the first concave cam 30A cooperates with the first matching portion 221, thereby allowing the first sliding member 71 to move a sufficient distance along the negative direction of the Y-axis to ensure the compression stroke of the first main elastic member 61. Correspondingly, the damping force provided by the first main elastic member 61 is guaranteed, thereby ensuring the opening and closing feel of the foldable electronic device 1000.

[0134] In some embodiments, referring to Figures 21, 22 and 23, the second concave cam 30B, the first pushing member 81 and the first driving member 91 can also be used to compress the first main elastic member 61 away from one end of the first sliding member 71 to increase the compression stroke of the first main elastic member 61, thereby increasing the damping force provided to the first fixed plate 500 and the first shell 210.

[0135] Specifically, the second concave cam 30B is rotatably connected to the first mounting shaft 41, and the first pushing member 81 and the first driving member 91 are both slidably connected to the first mounting shaft 41. Along the axial direction of the first mounting shaft 41, the first driving member 91 is located between the first primary elastic member 61 and the first stop member 51. The second concave cam 30B is located at the end of the first rotating body 22A away from the first concave cam 30A, and the first pushing member 81 is located on the side of the second concave cam 30B away from the first rotating body 22A. In other words, the first driving member 91, the first primary elastic member 61, the first sliding member 71, the first concave cam 30A, the first rotating body 22A, the second concave cam 30B, and the first pushing member 81 are arranged in sequence along the axial direction of the first mounting shaft 41. The first primary elastic member 61 abuts the first sliding member 71 and the first pushing member 81 at both ends, respectively. The second concave-convex portion mates with the second mating portion.

[0136] It is understood that the first pushing member 81 and the first driving member 91 are each provided with a through-hole extending along the Y-axis direction, and the first mounting shaft 41 passes through the through-holes of the first pushing member 81 and the first driving member 91, so that the first pushing member 81 and the first driving member 91 are slidably connected to the first mounting shaft 41. The first mounting shaft 41 passes through the through-hole 31 of the second concave cam 30B, so that the second concave cam 30B is rotatably connected to the first mounting shaft 41.

[0137] When the foldable electronic device 1000 is in the unfolded state, the protrusion of the second concave-convex portion abuts against the concave portion of the second matching portion.

[0138] When the foldable electronic device 1000 switches from the unfolded state to the folded state, the first fixing plate 500 rotates around the supporting base 400, and the first swinging member 21A slides within the first groove of the first fixing plate 500. The first rotating member 22A simultaneously drives the first concave cam 30A and the second concave cam 30B to rotate along the first mounting axis 41. During the rotation of the first concave cam 30A, the protrusion of the first concave cam 30A gradually switches to abutment with the protrusion of the first mating portion 221. During this process, the first concave cam 30A and the first mating portion 221 wear against each other. At this time, the first sliding member 71 gradually moves in the negative direction of the Y-axis, compressing one end of the first primary elastic member 61. At the same time, during the rotation of the second concave cam 30B, the protrusion of the second concave cam 30B gradually switches to abutment with the protrusion of the second matching portion. During this process, the second concave-convex portion and the second matching portion of the second concave cam 30B wear each other. At this time, the first pushing member 81 gradually moves toward the positive direction of the Y-axis, and the first pushing member 81 drives the first driving member 91 to gradually move toward the positive direction of the Y-axis to compress the other end of the first main elastic member 61 to provide a damping force for the first main elastic member 61. The two ends of the first main elastic member 61 are compressed synchronously, and the compression stroke of the first main elastic member 61 is doubled. Therefore, the damping force provided by the first main elastic member 61 to the first fixed plate 500 and the first shell 210 is greatly increased.

[0139] As can be seen above, during movement, the second concave cam 30B primarily contacts the first mating portion, causing wear. If the second concave-convex portion of the second concave cam 30B is severely worn, the movement stroke of the first slider 71 along the positive Y-axis direction will be too short, which in turn shortens the compression stroke of the first primary elastic member 61. Consequently, the damping force provided by the first primary elastic member 61 will decrease.

[0140] In the embodiment of the present application, the second concave cam 30B is provided with good wear resistance, thereby reducing the degree of wear when the second concave-convex portion of the second concave cam 30B cooperates with the second matching portion, thereby allowing the first sliding member 71 to move a sufficient distance along the positive direction of the Y-axis to ensure the compression stroke of the first main elastic member 61. Correspondingly, the damping force provided by the first main elastic member 61 is guaranteed, thereby ensuring the opening and closing feel of the foldable electronic device 1000.

[0141] In some embodiments, referring to Figures 21, 22, and 23, the second rotating body 22B, the third concave cam 30C, the fourth concave cam 30D, the second mounting shaft 42, the second stopper 52, the second primary elastic member 62, the second sliding member 72, the second pushing member 82, and the second driving member 92 cooperate to provide a damping force for the second fixing plate 600 and the second housing 220. The process by which the second fixing plate 600 and the second housing 220 obtain the damping force is similar to the process by which the first fixing plate 500 and the first housing 210 obtain the damping force, and thus will not be further described. The principle by which the third concave cam 30C ensures sufficient damping force for the second primary elastic member 62 is similar to the principle by which the first concave cam 30A ensures sufficient damping force for the first primary elastic member 61. The principle by which the fourth concave cam 30D ensures sufficient damping force for the second primary elastic member 62 is similar to the principle by which the second concave cam 30B ensures sufficient damping force for the first primary elastic member 61, and thus will not be further described.

[0142] In some embodiments, as shown in Figures 19 and 20 , an auxiliary elastic member 63 and a connecting shaft 64 can be used to further increase the damping force. The number of connecting shafts 64 and auxiliary elastic members 63 can be one, two, three, or four, and this application does not impose any limitations. Specifically, as shown in Figures 21 , 22 , and 23 , the connecting shaft 64 has opposite ends that are slidably connected to the first connecting member 73 and the third connecting member 93 , respectively. The auxiliary elastic member 63 is slidably mounted on the connecting shaft 64.

[0143] When the first sliding member 71 moves along the negative direction of the Y-axis and the first driving member 91 moves along the positive direction of the Y-axis, the first connecting member 73 is fixedly connected to the first sliding member 71, and the third connecting member 93 is fixedly connected to the first driving member 91. As a result, the first connecting member 73 and the first sliding member 71 move synchronously, and the third connecting member 93 and the first driving member 91 move synchronously, causing both ends of the auxiliary elastic member 63 to be compressed synchronously, thereby increasing the damping force.

[0144] It is understood that the auxiliary elastic member 63 and the connecting shaft 64 can also provide damping force for the second fixing plate 600 and the second housing 220. Details will not be repeated here.

[0145] In some embodiments, referring to Figures 21, 22, and 23, the outer circumference of the first rotating body 22A is provided with first drive teeth 222, and the outer circumference of the second rotating body 22B is provided with second drive teeth 223. The first rotating body 22A is rotationally connected to the first mounting shaft 41, and the second rotating body 22B is rotationally connected to the second mounting shaft 42; the first drive teeth 222 and the second drive teeth 223 are in driving connection. This allows for synchronous rotation of the first fixed plate 500 and the second fixed plate 600, thereby achieving synchronous rotation of the first housing 210 and the second housing 220.

[0146] When the first fixing plate 500 and the first housing 210 rotate around the supporting base 400, they can drive the second fixing plate 600 and the second housing 220 to rotate synchronously. When the second fixing plate 600 and the second housing 220 rotate around the supporting base 400, they can drive the first fixing plate 500 and the first housing 210 to rotate synchronously. The following description uses the example of the first fixing plate 500 and the first housing 210 rotating around the supporting base 400 and driving the second fixing plate 600 and the second housing 220 to rotate synchronously.

[0147] Specifically, when the first housing 210 and the first fixed plate 500 rotate about the support base 400, the first rotating member 22A of the first damping swing arm 10A rotates, and the first drive teeth 222 and the second drive teeth 223 are in transmission connection, so that the first rotating member 22A drives the second rotating member 22B of the second damping swing arm 10B to rotate. The second rotating member 22B drives the second swinging member 21B to slide and rotate, and the second swinging member 21B drives the second fixed plate 600 and the second housing 220 to rotate, achieving synchronous rotation of the first housing 210 and the second housing 220.

[0148] In some embodiments, referring to Figures 21, 22, and 23, the rotating mechanism 100 further includes a support frame and N synchronous gears, where N is an even number, meaning the number of synchronous gears can be two, four, six, or eight, etc. In one specific embodiment, there are two synchronous gears. The two synchronous gears are a first synchronous gear 224 and a second synchronous gear 225. The first synchronous gear 224 and the second synchronous gear 225 are meshed with each other, and the first synchronous gear 224 is also meshed with the first drive gear 222, and the second synchronous gear 225 is also meshed with the second drive gear 223.

[0149] The support frame is disposed between the first rotating body 22A and the second rotating body 22B, and the first installation shaft 41 and the second installation shaft 42 also pass through the support frame. The fixed shafts extending from both ends of the synchronous gear are connected to the support frame and the second connecting member 83 respectively.

[0150] When the first housing 210 and the first fixed plate 500 rotate about the supporting base 400, the first rotating member 22A of the first damping swing arm 10A rotates. The power of the first rotating member 22A is transmitted to the second rotating member 22B via the first driving gear 222, the first synchronous gear 224, the second synchronous gear 225, and the second driving gear 223, causing the second rotating member 22B of the second damping swing arm 10B to rotate. The second rotating member 22B drives the second swinging member 21B to slide and rotate, which in turn drives the second fixed plate 600 and the second housing 220 to rotate, achieving synchronous rotation of the first housing 210 and the second housing 220.

[0151] In some other embodiments, the rotating mechanism 100 may not be provided with a synchronous gear, but instead the first driving teeth 222 and the second driving teeth 223 may be directly engaged to achieve synchronous transmission.

[0152] 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, Comprising: A damping swing arm, the damping swing arm comprising a body and a cam with uneven surfaces; The body comprises a swinging body and a rotating body, and along the length direction of the damping swing arm, the swinging body and the rotating body are fixedly connected; along the width direction of the damping swing arm, the cam with uneven surfaces and the rotating body are coaxial and fixedly connected; The body has a first Rockwell hardness, and the cam with uneven surfaces has a second Rockwell hardness, and the second Rockwell hardness is greater than the first Rockwell hardness.

2. The rotating mechanism according to claim 1, characterized in that, The first Rockwell hardness A1 satisfies the following condition: A1≥a, and the second Rockwell hardness A2 satisfies the following condition: A2<a, where 50HRC≥a≥45HRC.

3. The rotating mechanism according to claim 1, wherein The body has a first yield strength, and the cam with uneven surfaces has a second yield strength, and the second yield strength is less than the first yield strength.

4. The rotating mechanism according to any one of claims 1 to 3, characterized in that, The cam with uneven surfaces comprises an uneven portion and a first mounting end facing away from each other along its axial direction, and the rotating body comprises two second mounting ends facing away from each other along its axial direction; the first mounting end is provided with a first limiting groove, and at least one of the second mounting ends is provided with a first limiting protrusion; alternatively, the second mounting end is provided with a first limiting groove, and at least one of the first mounting ends is provided with a first limiting protrusion; the first limiting protrusion extends into the first limiting groove to limit the circumferential and / or radial movement of the cam with uneven surfaces.

5. The rotating mechanism according to claim 4, characterized in that The first limiting protrusion and the first limiting groove are in interference fit to fixedly connect the cam with uneven surfaces and the rotating body.

6. The rotating mechanism according to claim 4, characterized in that, The axial centerlines of the cam with uneven surfaces and the rotating body coincide, there are multiple first limiting protrusions, there are multiple first limiting grooves, and the multiple first limiting protrusions are arranged at intervals around the axial centerline, and the multiple first limiting grooves are arranged at intervals around the axial centerline.

7. The rotating mechanism according to claim 6, characterized in that, A second limiting groove is formed between two adjacent first limiting protrusions, and a second limiting protrusion is formed between two adjacent first limiting grooves; the second limiting protrusion extends into the second limiting groove to limit the circumferential and / or radial movement of the cam with uneven surfaces.

8. The rotation mechanism according to any one of claims 1 to 3, characterized in that, The cam with uneven surfaces comprises an uneven portion and a first mounting end facing away from each other along its axial direction, and the rotating body comprises two second mounting ends facing away from each other along its axial direction; the second mounting end is provided with a third limiting protrusion, and the first mounting end is provided with a third limiting groove; or, the second mounting end is provided with a third limiting groove, and the first mounting end is provided with a third limiting protrusion; the axials of the rotating body and the cam with uneven surfaces are the same, and the third limiting protrusion extends into the third limiting groove to limit the axial movement of the cam with uneven surfaces.

9. The rotating mechanism according to claim 8, characterized in that, Along the axial direction, the width of the third limiting protrusion gradually increases, and the width of the third limiting groove gradually increases.

10. The rotating mechanism according to claim 8, wherein, The third limiting protrusion comprises two axial limiting surfaces facing away from each other along the axial direction, and the third limiting groove comprises two axial limiting groove surfaces facing each other along the axial direction; the two axial limiting surfaces are respectively opposite to the two axial limiting groove surfaces.

11. The rotating mechanism according to any one of claims 1 to 3, characterized in that, The cam with uneven surfaces and the rotating body are fixedly connected by welding; or, the cam with uneven surfaces and the rotating body are fixedly connected by bonding.

12. The rotating mechanism according to any one of claims 1 to 3, characterized in that, The cam with uneven surfaces comprises a first cam with uneven surfaces, and the first cam with uneven surfaces is provided with a first uneven portion; The rotating mechanism further includes a first mounting shaft, a first limiting member, a first main elastic member, and a first sliding member; the first sliding member is provided with a first mating portion; The first limiting member is fixed to the first mounting shaft, the first main elastic member and the first sliding member are both slidably connected to the first mounting shaft, and two ends of the first main elastic member respectively abut against the first limiting member and the first sliding member; The first cam and the rotating body are both rotatably connected to the first mounting shaft; Axially along the first mounting shaft, the first limiting member, the first main elastic member, the first sliding member, the first cam, and the rotating body are arranged in sequence; the first cam portion and the first mating portion are matched with each other; The protrusion of the first cam portion abuts against the protrusion of the first mating portion, and the first main elastic member is in a compressed state; The protrusion of the first cam abuts against the concave portion of the first mating portion, and the first main elastic member is in a pre-compressed state.

13. The rotating mechanism according to claim 12, characterized in that, The cam further includes a second cam, and the second cam is provided with a second cam portion; The rotating mechanism further includes a first pushing member and a first driving member, and the first pushing member and the first driving member are fixedly connected; the first pushing member is provided with a second mating portion; The second cam is rotatably connected to the first mounting shaft, and the first pushing member and the first driving member are both slidably connected to the first mounting shaft; Axially along the first mounting shaft, the first driving member is located between the first main elastic member and the first limiting member, the second cam is located at one end of the rotating body away from the first cam, and the first pushing member is located on a side of the second cam away from the rotating body; the second cam portion and the second mating portion are matched with each other; The first main elastic member is in a compressed state, and the protrusion of the second cam portion abuts against the protrusion of the second mating portion; The first main elastic member is in a pre-compressed state, and the protrusion of the second cam portion abuts against the concave portion of the second mating portion.

14. The rotating mechanism according to any one of claims 1 to 3, characterized in that There are two damping swing arms, and the two damping swing arms are respectively a first damping swing arm and a second damping swing arm. The first damping swing arm includes a first swinging body and a first rotating body, and the second damping swing arm includes a second swinging body and a second rotating body; a first driving tooth is provided on an outer peripheral surface of the first rotating body, and a second driving tooth is provided on an outer peripheral surface of the second rotating body; The rotating mechanism further includes a first mounting shaft and a second mounting shaft, and the first mounting shaft and the second mounting shaft are parallel and spaced apart; the first rotating body is rotatably connected to the first mounting shaft, and the second rotating body is rotatably connected to the second mounting shaft; the first driving tooth and the second driving tooth are in transmission connection.

15. A foldable electronic device, characterized in that, It includes a first housing, a second housing, and the rotating mechanism according to any one of claims 1 to 14; the rotating mechanism is connected between the first housing and the second housing.

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