Rotating shaft assembly and foldable electronic equipment

Abstract

The invention provides a rotating shaft assembly and foldable electronic equipment, the rotating shaft assembly is applied to the foldable electronic equipment, the rotating shaft assembly comprises an integrally formed rotating shaft support, the rotating shaft support extends from a first end of the foldable equipment to a second end of the foldable equipment along a first direction, the middle part of the rotating shaft bracket is provided with a first interval section for the flexible circuit board to pass through; at least four groups of main swing arms, each group of main swing arms comprises two main swing arms which are symmetrically arranged on two sides of the rotating shaft bracket, and each main swing arm is rotatably connected with the rotating shaft bracket; and four groups of main swing arms in the at least four groups of main swing arms are respectively arranged at the first end and the second end of the rotating shaft bracket and two sides of the first interval section. According to the rotating shaft assembly, the reliability of the overall strength can be ensured under the condition that the overall lightness and thinness are ensured.

Description

Technical Field

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

[0002] Foldable electronic devices (e.g., foldable screen mobile phones) can switch between unfolded and folded states, combining portability with large-screen display effects, and are becoming increasingly popular in the market. Foldable electronic devices are folded and unfolded through a hinge assembly, which may include a hinge bracket, a main swing arm, and a damping assembly that provides a damping effect.

[0003] As foldable electronic devices become thinner and lighter, the hinge assembly also needs to be thinner and lighter. However, how to ensure the reliability of the hinge assembly while making it thinner and lighter is a difficult problem that needs to be overcome. Summary of the invention

[0004] In view of this, the present application provides a hinge assembly for solving the problem that the current hinge assembly is light and thin but cannot meet the requirements of strength and reliability.

[0005] Some embodiments of the present application provide a shaft assembly. The present application is introduced from multiple aspects below, wherein the embodiments and beneficial effects of the multiple aspects can be referenced to each other.

[0006] In a first aspect, the present application provides a hinge assembly for use in a foldable electronic device, the hinge assembly comprising: an integrally formed hinge bracket, the hinge bracket extending from a first end of the foldable device along a first direction to a second end of the foldable device, the middle portion of the hinge bracket having a first interval section for a flexible circuit board to pass through; at least four groups of main swing arms, each group of main swing arms comprising two main swing arms symmetrically arranged on both sides of the hinge bracket, each main swing arm being rotatably connected to the hinge bracket; four of the at least four groups of main swing arms are respectively arranged at the first end, the second end and both sides of the first interval section of the hinge bracket.

[0007] According to the pivot assembly of the embodiment of the present application, an integrally formed pivot bracket is adopted, and main swing arms are connected at both ends of the pivot bracket and at both ends of the flexible circuit board, which can improve the overall strength of the pivot assembly.

[0008] As an embodiment of the first aspect, the rotating shaft support includes:

[0009] The bracket body is in the shape of an elongated strip extending along a first direction, and the length of the bracket body along the first direction is the length of the rotating shaft bracket along the first direction;

[0010] A support part, the support part is symmetrically arranged on the support body with the support body as an axis, a slide groove is arranged at the installation position of the support part corresponding to the main swing arm, and a first arc-shaped sliding surface of the slide groove matches a second arc-shaped sliding surface of the main swing arm;

[0011] The installation position of the support part is configured as three sections arranged at intervals, namely a left section, a middle section and a right section, and the slide grooves are respectively arranged on the left section, the middle section and the right section.

[0012] The use of an integrated distributed slide can reduce the manufacturing tolerance of multiple parts and improve the installation accuracy of the main swing arm and the shaft bracket. In addition, since it is a single component installation, it can reduce installation time and improve production efficiency.

[0013] As an embodiment of the first aspect, the slide grooves of the left section and the right section are arranged on the lower surface of the support portion, the slide groove of the middle section is arranged on the upper surface of the support portion, and the slide grooves on the left section, the middle section and the right section are coaxial, ensuring that the main swing arm can rotate along the axis after being matched with the slide groove.

[0014] As an embodiment of the first aspect, the slide grooves of the left and right sections are arranged on the upper surface of the support portion, the slide groove of the middle section is arranged on the lower surface of the support portion, and the slide grooves on the left, middle and right sections are coaxial. This structure as another embodiment ensures that the main swing arm can rotate along the axis after matching with the slide groove.

[0015] As an embodiment of the first aspect, the rotating shaft assembly also includes: a plurality of damping assemblies, which are arranged in other intervals of the rotating shaft bracket except the first interval. The damping assembly includes: a spring mechanism, which is installed on the rotating shaft bracket, and the first rotating shaft of the spring mechanism is arranged along the first direction; a gear mechanism, which is installed on the rotating shaft bracket, and the second rotating shaft of the gear mechanism is arranged along the first direction, and the first rotating shaft and the second rotating shaft are rotating shafts with different axes; two auxiliary swing arms, which are symmetrically arranged with the rotating shaft bracket as the axis, and are rotatably connected to the rotating shaft bracket, and the first side of the auxiliary swing arm is meshed with the gear of the gear mechanism, and the other side is abutted with the spring mechanism through the structure of the cam and the concave wheel, and when the auxiliary swing arm rotates, the compression force of the spring of the spring mechanism is increased or decreased. By adopting the relative rotation of the cam and the concave wheel, the friction force of the contact surface of the cam and the concave wheel can be adjusted, and then the different rotation feel experience brought to the user by the shell during the rotation process can be adjusted, thereby improving the user experience.

[0016] As an embodiment of the first aspect, a convex-concave wheel is provided on one side of the auxiliary swing arm; a concave cam corresponding to the convex-concave wheel is provided on one side of the spring mechanism, and the convex-concave wheel and the concave cam rotate around the first rotating shaft; when the convex-concave wheel and the concave cam rotate around the first rotating shaft to a meshing state, the raised portion on the convex-concave wheel corresponds to the recessed portion of the concave cam, and the recessed portion on the convex-concave wheel corresponds to the raised portion of the concave cam. The convex-concave structure cooperates to change the compression force of the spring when the auxiliary swing arm rotates, and provides a damping force for the rotation of the auxiliary swing arm, thereby providing a damping effect on the rotation function of the entire rotating shaft assembly, thereby improving the user's feel when rotating the folding screen mobile phone.

[0017] As an embodiment of the first aspect, a first gear is provided on the auxiliary swing arm, and the gear mechanism includes a second gear, the first gear is meshed with the second gear, and the auxiliary swing arms on both sides of the rotating shaft bracket are driven to rotate synchronously through the first gear and the second gear. This structure is simple and can display the synchronous rotation of the two auxiliary swing arms.

[0018] As an embodiment of the first aspect, the second gear includes at least two second gears, and the at least two second gears are meshed with each other.

[0019] As an embodiment of the first aspect, the shaft assembly further includes: a connecting member, which is rotatably connected to at least two main swing arms and at least one auxiliary swing arm. The connecting member, as a bridge connecting the two main swing arms, can not only improve the coaxial rotation capability between the main swing arms, but also improve the anti-fall capability of the connecting member compared to the connection mode of a single main swing arm due to the connection of the two main swing arms.

[0020] As an embodiment of the first aspect, two main swing arms rotatably connected to the connecting member are respectively located at two ends of the connecting member. To further improve the anti-fall performance of the connecting member,

[0021] As an embodiment of the first aspect, the shaft assembly also includes: a door panel, which is laid on the main swing arm, the auxiliary swing arm and the connecting piece, and is respectively connected to the main swing arm, the auxiliary swing arm and the connecting piece. The overall linkage of the shaft assembly can be improved, and at the same time, it can support the display screen and improve the overall strength of the product. The door panel includes: a door panel body, which is rotatably connected to the connecting piece; a slide member, which is arranged on the door panel and has an arc surface formed on the surface, which is used to assist the door panel body to rotate relative to the connecting piece along the trajectory of the arc surface, and the door panel body and the slide member are integrally formed. The overall strength of the door panel and the strength of the kinematic pair can be ensured, while meeting the processing feasibility and processing accuracy of the product, which is not only conducive to the thinning of the whole machine, but also can ensure the overall strength of the product.

[0022] As an embodiment of the first aspect, a first overlap surface is provided on the side of the door panel opposite to the auxiliary swing arm; a second overlap surface is provided on the side of the auxiliary swing arm opposite to the door panel; when the auxiliary swing arm drives the door panel to be in a folded state and the door panel moves toward the auxiliary swing arm, the first overlap surface abuts against the second overlap surface, and when the door panel returns to the position before the movement, a gap is formed between the first overlap surface and the second overlap surface. Thus, the anti-falling ability of the auxiliary swing arm in the event of an accidental fall is improved without affecting normal use.

[0023] As an embodiment of the first aspect, there are multiple first overlapping surfaces, multiple second overlapping surfaces, and the multiple first overlapping surfaces correspond to the multiple second overlapping surfaces one by one, thereby further improving the anti-falling capability of the auxiliary swing arm.

[0024] As an embodiment of the first aspect, both sides of the middle section near one end of the bracket body are provided with deployment stop blocks, and the deployment stop blocks abut against the first abutting surface of the main swing arm when the main swing arm is in the deployed state to limit the deployment angle of the main swing arm. When the main swing arm is in the deployed state, the abutting surface of the deployment stop block abuts against the first abutting surface of the main swing arm, thereby limiting the deployment angle of the main swing arm to avoid the deployment angle being too large and affecting the horizontality of the two display screens of the folding screen mobile phone after deployment.

[0025] As an embodiment of the first aspect, a folding stop block is provided on the opposite sides of the left section and the right section, respectively, and the folding stop block abuts against the second abutting surface of the main swing arm when the main swing arm is in a folded state to limit the folding angle of the main swing arm, so as to avoid the folding angle being too large and damaging the display screen.

[0026] As an embodiment of the first aspect, an arc-shaped slide groove is provided at the position where the auxiliary swing arm overlaps with the connecting member. When the auxiliary swing arm is in a folded state, the end of the connecting member abuts against the side wall of the arc-shaped slide groove. When the auxiliary swing arm drives the connecting member to rotate, the end of the connecting member slides along the arc surface of the arc-shaped slide groove. Compared with the traditional straight-line shape, it is beneficial to increase the thickness of the auxiliary swing arm and enhance its strength, which is beneficial to increase the selection space for installing the display screen and can enhance the anti-drop ability of the entire axis.

[0027] As an embodiment of the first aspect, six groups of main swing arms are provided, and increasing the number of main swing arms can improve the overall strength of the rotating shaft assembly.

[0028] As an embodiment of the first aspect, four groups of damping assemblies are provided, which can not only improve the overall strength of the shaft assembly, but also cooperate with the main swing arm to improve the feel of opening and closing the device.

[0029] In a second aspect, the foldable electronic device includes: a first shell, a second shell and a hinge assembly, the first shell and the second shell are rotatably connected through the hinge assembly, and the hinge assembly is the hinge assembly explained in the above-mentioned embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the unfolded state, intermediate state, and folded state of a foldable screen mobile phone provided in an embodiment of the present application;

[0031] Figure 2 A top view of the shaft assembly provided in an embodiment of the present application when in an expanded state;

[0032] Figure 3 A bottom view of the rotating shaft assembly provided in an embodiment of the present application when in an unfolded state;

[0033] Figure 4 A top view of the rotating shaft bracket provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of a partial structure of a rotating shaft support provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the three-dimensional structure of the main swing arm provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of the structure of a damping assembly provided in an embodiment of the present application;

[0037] Figure 8 An exploded view of a damping assembly provided in an embodiment of the present application;

[0038] Fig. 9 A schematic diagram of the structure of a door panel provided in an embodiment of the present application;

[0039] Fig.10 A schematic diagram of the local structure of the rotating shaft assembly provided in an embodiment of the present application when in a folded state;

[0040] Fig.11 for Fig.10 The cross-sectional structure diagram in the AA direction;

[0041] Fig.12 A schematic diagram of a partial structure of a rotating shaft assembly provided in an embodiment of the present application when in an expanded state;

[0042] Fig.13 for Fig.12 The cross-sectional structure diagram along the BB direction;

[0043] Fig.14 A schematic structural diagram of a main swing arm from another angle provided in an embodiment of the present application;

[0044] Fig.15 A schematic diagram of the structure of another angle shaft assembly provided in an embodiment of the present application when it is in a folded state;

[0045] Fig.16for Fig.15 Cross-sectional structure diagram in the CC direction;

[0046] Fig.17 A schematic diagram of a partial structure of a rotating shaft assembly in a folded state at another angle provided in an embodiment of the present application;

[0047] Fig.18 for Fig.17 Cross-sectional structure diagram in the DD direction.

[0048] Reference numerals:

[0049] Folding screen mobile phone 1000;

[0050] First housing 100; first screen 110; opening 111;

[0051] Second housing 200; second screen 210;

[0052] A shaft assembly 300;

[0053] The shaft bracket 310; the first section 311; the second section 312; the first end 313; the second end 314; the bracket body 315; the support portion 316; the installation position 317; the left section a; the middle section b; the right section c; the first slide groove a1; the second slide groove c1; the third slide groove b1; the first arc-shaped sliding surface a11; the unfolding stop block e; the folding stop block f;

[0054] Main swing arm 320; fourth slide slot 321; fifth slide slot 322; sixth slide slot 323; second arc-shaped sliding surface 324; first abutting surface 325; second abutting surface 326;

[0055] Damping assembly 330;

[0056] Spring mechanism 331; first rotating shaft 331a; concave cam 331b; recessed portion 331b1; spring 331c; first fixing seat 331d; second fixing seat 331e;

[0057] Gear mechanism 332; second gear 332a; third fixing seat 332b; fourth fixing seat 332c; second rotating shaft 332d;

[0058] Auxiliary swing arm 333; first gear 333a; convex-concave wheel 333b; raised portion 333b1; second lap surface 3331; arc-shaped slide groove 3332;

[0059] Connector 334;

[0060] Door panel 335 ; door panel body 3351 ; first slide slot member 3352 ; second slide slot member 3353 ; first overlap surface 3354 . DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0062] The foldable electronic device according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0063] In the embodiments of the present application, the foldable electronic device may be, but is not limited to, a foldable screen mobile phone, and may also be a tablet personal computer, an e-book reader, a laptop computer, a personal digital assistant (PDA), a personal computer, a notebook computer, a vehicle-mounted device, a wearable device (such as a watch), and other electronic devices that need to be opened and closed. In the following embodiments, a foldable screen mobile phone is taken as an example to illustrate the structure of the foldable electronic device.

[0064] See also Figure 1 , Figure 1 A schematic diagram of the process of the folding screen mobile phone from the unfolded state to the folded state in the embodiment of the present application is shown. Figure 1 (a) is a schematic diagram of the structure of the folding screen mobile phone in the embodiment of the present application in a fully unfolded state; Figure 1 (b) is a schematic diagram of the structure of the folding screen mobile phone in the embodiment of the present application switching from the unfolded state to the folded state; Figure 1 (c) is a schematic diagram of the structure of the folding screen mobile phone in the folded state according to an embodiment of the present application.

[0065] like Figure 1 As shown, the foldable screen mobile phone 1000 includes a first housing 100, a second housing 200 and a hinge assembly 300 (i.e., a hinge device). The first housing 100 and the second housing 200 are rotatably connected via the hinge assembly 300. In different usage states, the user can rotate the first housing 100 and the second housing 200 around the hinge assembly 300 to achieve different usage states of the foldable screen mobile phone 1000, such as the unfolded state and the folded state. Figure 1 As shown in (a) of FIG. 1 , when the first housing 100 rotates around the rotating shaft assembly 300 to an angle of 0, the folding screen mobile phone 1000 is in a fully unfolded use state (which can be understood as an unfolded state). Figure 1 As shown in (b), the first housing 100 rotates around the shaft assembly 300 toward the second housing 200. When the rotation angle is 180°, the following is obtained: Figure 1 The foldable screen mobile phone 1000 shown in (c) is in a completely closed state (which can be understood as a folded state).

[0066] It should be noted that the angles illustrated in this application are allowed to have a slight deviation. For example, when the folding screen mobile phone 1000 is in an open state, the opening angle can be 180°, or about 180°, such as 170°, 175°, 185° or 190°, etc. Within the angle range of a certain amplitude different from 180 degrees, the corresponding rotation angle can be understood as 170°, 175°, 185° or 190°, etc. The angles illustrated in the following text can be understood in the same way.

[0067] Those skilled in the art will appreciate that the present application does not limit the specific structure of the folding screen mobile phone 1000. For example, the folding screen mobile phone 1000 may also include various electronic components, which together with the first shell 100, the second shell 200 and the hinge assembly 300 constitute the folding screen mobile phone 1000. The first shell 100, the second shell 200 and the hinge assembly 300 provide protection and support for various electronic components and other structures. To facilitate understanding of the folding process and usage scenarios of the folding screen mobile phone 1000, the following exemplifies the possible structures. In addition, in the embodiment of the present application, the folding screen mobile phone may be an inner folding screen mobile phone, that is, in the folded state of the folding screen mobile phone, the display screen is retracted between the two shells.

[0068] like Figure 1 As shown, in one embodiment, the folding screen mobile phone 1000 further includes a display screen, which is laid on one side of the housing assembly consisting of the first housing 100, the second housing 200 and the hinge assembly 300. The portion of the display screen installed on the first housing 100 can be called the first screen 110, and the portion of the display screen installed on the second housing 200 can be called the second screen 210, wherein the first screen 110 and the second screen 210 can be a whole screen. Figure 1 As shown in (b), driven by the hinge assembly 300, the first screen 110 rotates with the first housing 100 around the hinge assembly 300 to achieve an unfolded state or a folded state with the second screen 210 on the second housing 200. In the embodiments of the present application, the display screen may be, but is not limited to, an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED) display screen, or a quantum dot light-emitting diode (QLED) display screen, etc., and the present application does not impose any limitation on this.

[0069] In one embodiment, the first housing 100 and the second housing 200 both have a storage space inside to accommodate some electronic components, wherein the electronic components include but are not limited to circuit boards, batteries, camera modules, microphones, speakers, etc., which are not limited in this application.

[0070] In the following embodiments, the shaft assembly 300 of the embodiment of the present application will be described in conjunction with the accompanying drawings.

[0071] In the various figures herein, the x direction is the length direction of the unfolded foldable screen mobile phone and its components (e.g., display screen), the y direction is the width direction of the unfolded foldable screen mobile phone and its components, and the z direction is the thickness direction of the foldable screen mobile phone and its components. The first direction mentioned in the embodiments of the present application may be the y-axis direction, and the second direction may be the z-axis direction.

[0072] Please refer to Figure 2 and Figure 3 , Figure 2 A top view of the rotating shaft assembly of an embodiment of the present application in an expanded state is shown; Figure 3 A bottom view of the rotating shaft assembly of the embodiment of the present application is shown in an expanded state.

[0073] like Figure 2 and Figure 3 As shown, the hinge assembly 300 includes a hinge bracket 310 and six sets of main swing arms 320. Among them, the six sets of main swing arms are used to drive the two middle frames (e.g. Figure 1 The first shell 100 and the second shell 200 in the folding screen mobile phone rotate around the hinge bracket 310. The hinge bracket 310 extends along the first direction of the folding screen mobile phone. The hinge bracket 310 extends from the first end 313 ( Figure 2 The left end of the folding screen mobile phone) extends along the first direction to the second end 314 ( Figure 2 The first end 313 is the leftmost end of the folding screen mobile phone, and the second end 314 is the rightmost end of the folding screen mobile phone.

[0074] The rotating shaft support 310 can be divided into multiple sections along the first direction, such as Figure 2 As shown, a first section 311 is provided in the middle part of the rotating shaft bracket 310, and the first section 311 can be used to lay a flexible printed circuit (FPC) (not shown). The flexible printed circuit is used as a conductor to connect the two circuit boards of the folding screen mobile phone. It should be noted that the specific structure of the flexible printed circuit board and the connection method with the two circuit boards can refer to the prior art, and will not be described in detail in the embodiments of this application.

[0075] In the embodiment of the present application, the rotating shaft bracket is integrally formed, and the integrally formed structure can reduce the tolerance and stress of the parts connection and improve the overall strength of the rotating shaft bracket.

[0076] like Figure 2 or Figure 3 As shown, six groups of main swing arms 320 are arranged relatively evenly along the first direction on the rotating shaft bracket 310. By setting a larger number of main swing arms 320, the strength of the rotating shaft assembly 300 can be effectively improved. In some embodiments of the present application, the number of groups of main swing arms 320 can be greater than six groups, such as seven groups or eight groups. Alternatively, the number of groups of main swing arms 320 can be less than six groups, such as four groups or five groups. It should be noted that the spacing between each group of main swing arms 320 may be unequal, that is, the uniformity described in the embodiments of the present application is relative, and there may be unequal spacing. For example, since the first interval section 311 of the rotating shaft bracket 310 separates the main swing arms 320 at both ends thereof at a larger distance than the distance between other main swing arms 320 on the same side on the second interval section 312, the uniformity at this time is not absolute uniformity.

[0077] like Figure 2 or Figure 3 As shown, in the unfolded state of the mobile phone, each group of main swing arms 320 may include two main swing arms 320, and the two main swing arms 320 are arranged along the second direction (reference Figure 1 The main swing arms 320 are symmetrically arranged on both sides of the rotating shaft bracket 310 in the x-axis direction when the mobile phone shown in (a) is in the unfolded state. Each main swing arm 320 is rotatably connected to the rotating shaft bracket 310.

[0078] In the embodiment of the present application, the second direction can be understood as a direction perpendicular to the axis of the rotating shaft assembly, that is, perpendicular to the first direction. The perpendicularity here is not absolute perpendicularity, but can also be approximately perpendicularity due to processing errors and assembly errors.

[0079] Among the six groups of main swing arms 320, four groups of main swing arms 320 are respectively arranged at the first end 313 of the rotating shaft bracket 310, the second end 314 of the rotating shaft bracket 310, and the two sides of the first interval section 311 along the first direction. That is, a group of main swing arms 320 is respectively arranged at the two ends closest to the edge of the rotating shaft bracket 310. The other two groups of main swing arms 320 can be arranged on the second interval section for the uniformity of the overall layout, for example Figure 2 In the embodiment, the second interval section 312 is arranged on the left side of the first interval section 311. The folding screen mobile phone is in the folded state (refer to Figure 1In the folded state shown in (c) in FIG. 1 , the first end 313 and the second end 314 of the hinge bracket 310 are exactly the two corners of the foldable screen mobile phone. When the foldable screen mobile phone falls, the corners touch the ground first and are the most likely to be damaged. Therefore, the main swing arm 320 is arranged near the first end 313 and the second end 314 to further provide support for the hinge bracket 310 and improve the overall strength of the hinge bracket 310. In addition, Figure 2 As shown, a group of main swing arms 320 are provided on both sides of the section of the pivot bracket 310 for laying the flexible circuit board (corresponding to the first interval section 311), which can strengthen the strength of the pivot bracket 310 on both sides of the flexible circuit board and is conducive to better protecting the flexible circuit board.

[0080] In some embodiments, the spacing between each set of main swing arms and the number of main swing arms can be adjusted based on the length of the rotating shaft bracket 310 .

[0081] refer to Figure 4 , Figure 4 FIG. 2 shows a top view of the rotating shaft support of an embodiment of the present application. Figure 4 As shown, the rotating shaft bracket 310 includes a bracket body 315 and a support portion 316. The bracket body 315 is a long strip extending along a first direction, and the length of the bracket body 315 along the first direction is the length of the rotating shaft bracket 310 along the first direction. The support portion 316 is symmetrically arranged on the bracket body 315 with the bracket body 315 as the axis.

[0082] In one embodiment of the present application, a slide groove may be provided at a connection position on the support portion 316 corresponding to the main swing arm, and a curved sliding surface is provided on the slide groove, and the curved sliding surface matches the curved sliding surface provided on the main swing arm 320, and the two curved sliding surfaces abut against each other. This connection method facilitates the main swing arm to slide along the curved curvature of the curved sliding surface, which is conducive to controlling the sliding angle of the main swing arm.

[0083] In one embodiment of the present application, Figure 4 The support portion 316 is configured into multiple sections for connection with other components, such as the main swing arm, the damping assembly, etc., with intervals between the sections. Figure 2 Taking the connection of the main swing arm 320 in the embodiment as an example, these intervals are used to accommodate a part of the main swing arm to realize the rotatable connection between the main swing arm and the rotating shaft bracket 310. The specific structure of the support part will be described below in conjunction with the accompanying drawings.

[0084] refer to Figure 5 and Figure 6 , Figure 5 A partial structural schematic diagram of a rotating shaft support according to an embodiment of the present application is shown; Figure 6 A schematic diagram of the three-dimensional structure of the main swing arm of an embodiment of the present application is shown.

[0085] like Figure 5 As shown, the mounting position 317 on the rotating shaft bracket 310 for connecting or mounting the main swing arm 320 is divided into a left section a (corresponding to Figure 5 The left side of the middle figure), the middle segment b and the right segment c (corresponding to Figure 5 The right side of the figure). The chutes are respectively arranged on the left section a, the middle section b and the right section c. The chutes on the left section a are correspondingly formed with a first chute a1, the chutes on the right section c are second chutes c1, and the chutes on the middle section b are third chutes b1. The first chutes a1, the second chutes c1 and the third chutes b1 constitute a distributed chute.

[0086] like Figure 6 As shown, the main swing arm 320 and the rotating shaft bracket (corresponding to Figure 5 A slide groove is also formed at one end connected to the central shaft bracket 310, and the slide groove is also divided into three sections. Among them, the arc-shaped sliding surface corresponding to the slide groove on the main swing arm 320 matches the arc-shaped sliding surface corresponding to the slide groove on the support portion 316, which facilitates the sliding and rotating connection between the main swing arm 320 and the shaft bracket. Compared with the traditional multi-component connection method of rotating with the swing arm, this one-piece distributed slide groove design can reduce the manufacturing tolerance size of multiple parts and improve the installation accuracy of the main swing arm 320 and the shaft bracket. In addition, since it is a single component installation, it can reduce installation time and improve production efficiency.

[0087] In the above Figure 5 and Figure 6 In the described embodiment, the left section a and the right section c are respectively arranged on the lower surface (such as Figure 5 The left side section a and the right side section c correspond to the lower surface), and the slide groove of the middle section b is set on the upper surface (such as Figure 5 The explanation is made by taking the surface corresponding to the upper side of the middle section b in the figure as an example. In some embodiments, the chutes on the left section a and the right section c may be arranged on their upper surfaces, and the chutes on the middle section b may be arranged on the lower surface. Alternatively, the chutes on the left section a are located on the upper surface, and the chutes on the middle section b and the right section c are arranged on the lower surface. Alternatively, the chutes on the left section a and the middle section b are arranged on the lower surface, and the chutes on the right section c are arranged on the upper surface, etc. In the embodiments of the present application, there is no sole limitation on the form in which the chutes are arranged on different sections.

[0088] In one embodiment of the present application, Figure 5As shown, the first arc-shaped sliding surface a11 corresponding to the first slide groove a1 is arranged on the lower surface of the left section a of the support portion 316, the first arc-shaped sliding surface a11 corresponding to the third slide groove b1 is arranged on the lower surface of the right section c of the support portion 316, and the first arc-shaped sliding surface a11 corresponding to the second slide groove c1 is arranged on the upper surface of the middle section b of the support portion 316. The axes of the slide grooves on the left section a, the slide grooves on the middle section b, and the slide grooves on the right section c, or the arc-shaped sliding surfaces corresponding to their slide grooves coincide. Accordingly, as Figure 5 and Figure 6 As shown, the slide groove of the main swing arm 320 is divided into a fourth slide groove 321, a fifth slide groove 322 and a sixth slide groove 323 therebetween. Among them, the fourth slide groove 321 corresponds to the first slide groove a1, the fifth slide groove 322 corresponds to the second slide groove c1, and the sixth slide groove 323 corresponds to the third slide groove b1, that is, the second arc sliding surface 324 corresponding to the fourth slide groove 321 matches the first arc sliding surface a11 corresponding to the first slide groove a1, the second arc sliding surface 324 corresponding to the fifth slide groove 322 matches the first arc sliding surface a11 corresponding to the second slide groove c1, and the second arc sliding surface 324 corresponding to the sixth slide groove 323 matches the first arc sliding surface a11 corresponding to the third slide groove b1. Through this integrated distributed slide groove connection structure, the manufacturing tolerance of the parts can be reduced, and the connection firmness between the rotating shaft bracket 310 and the main swing arm 320 can be strengthened through the installation method of alternating matching of the upper surface and the lower surface of the slide groove.

[0089] Refer back to Figure 2 As shown, the shaft assembly 300 further includes four groups of damping assemblies 330, which are arranged in the second section 312 of the shaft bracket 310. The second section 312 is the other section of the shaft bracket 310 except the first section 311. The damping assembly 330 is used to assist the main swing arm 320 in driving the first shell and the second shell (corresponding to Figure 1 The first shell 100 and the second shell 200 in the mobile phone are relatively rotated, so that the first shell and the second shell can rotate synchronously, and the damping component can provide rotation resistance for the main swing arm, thereby improving the feel of the mobile phone with changing angles during folding and unfolding. In some embodiments of the present application, the number of damping components 330 can be greater than 4 groups, for example, 5 groups, 6 groups or more, or less. The specific structure and working principle of the damping component 330 are described below in conjunction with the accompanying drawings.

[0090] refer to Figure 7 and Figure 8 , Figure 7 A schematic structural diagram of a damping assembly according to an embodiment of the present application is shown; Figure 8 An exploded view of a damping assembly according to an embodiment of the present application is shown.

[0091] like Figure 7 and Figure 8 As shown, the damping assembly 330 may include a spring mechanism 331, a gear mechanism 332 and two auxiliary swing arms 333. The spring mechanism 331 is mounted on the rotating shaft bracket (corresponding to Figure 4 The first rotating shaft 331a of the spring mechanism 331 is arranged along the first direction. The gear mechanism 332 is mounted on the rotating shaft bracket (corresponding to Figure 2 On the rotating shaft bracket 310 in the gear mechanism 332, the second rotating shaft 332d of the gear mechanism 332 is arranged along the first direction. The two auxiliary swing arms 333 are symmetrically arranged with the rotating shaft bracket as the axis, and are rotatably connected to the rotating shaft bracket.

[0092] In an embodiment of the present application, the main swing arm and the damping assembly 330 are alternately arranged on the pivot bracket 310, that is, the main swing arm and the auxiliary swing arm 333 are alternately arranged on the pivot bracket 310, so that when switching between the unfolded and folded states, the force on the main swing arm on the pivot assembly is more uniform, and the damping force in the first direction is more uniform.

[0093] First, the principle of the damping assembly 330 driving the auxiliary swing arms 333 on both sides of the rotating shaft bracket to rotate synchronously is described. Figure 7 and Figure 8 As shown, a first gear 333a is provided on the first side of the auxiliary swing arm 333, and the gear mechanism 332 includes a second gear 332a, and the first gear 333a meshes with the second gear 332a. A convex-concave wheel 333b is formed on the other side (connecting shaft) of the auxiliary swing arm 333, and a concave cam 331b is formed on the end of the spring mechanism 331 that abuts against the auxiliary swing arm 333. The auxiliary swing arm 333 and the spring mechanism 331 abut against each other through the structure of the convex-concave wheel 333b and the concave cam 331b. Figure 7 and 8 As shown, the convex-concave wheel 333b and the concave cam 331b both include a sawtooth-like concave portion and a convex portion, forming an undulating sawtooth structure. The two wheels are meshed and connected. When the auxiliary swing arm 333 rotates, the concave cam 331b and the convex-concave wheel 333b can rotate relative to each other around the same axis, so that the relative rotation of the concave cam 331b and the convex-concave wheel 333b can further drive the first shell and the second shell (corresponding to Figure 1 The first shell 100 and the second shell 200 in the folding screen are relatively rotated. This can assist the folding screen mobile phone to rotate both sides at the same time in the unfolded state and the folded state, and improve the feel of automatic opening and closing.

[0094] Next, the damping assembly 330 is described as the main swing arm (eg Figure 3 The process of providing damping force to the main swing arm 320 in FIG. Figure 7 and Figure 8As shown, the end surfaces of the concave cam 331b and the convex-concave wheel 333b that contact each other are both set to an uneven structure, like an irregular gear shape. Among them, when the convex-concave wheel 333b and the concave cam 331b are fully meshed, the concave part of the convex-concave wheel 333b corresponds to the convex part of the concave cam 331b, and the convex part of the convex-concave wheel 333b corresponds to the concave part of the concave cam 331b. In the following, it is taken as an example that the convex-concave wheel 333b is provided with multiple protrusions 333b1 protruding outwards, and the concave cam 331b is provided with multiple concave parts 331b1 concave inwards. Figure 7 As shown in FIG. 1 , when the auxiliary swing arm 333 rotates, the raised portion 333b1 of the convex-concave wheel 333b rotates and slides along the side wall of the concave portion 331b1 of the concave cam 331b. When the raised portion 333b1 of the cam 333b moves along the bottom of the concave portion 331b1 of the concave wheel 331b toward the opening direction of the concave portion 331b1, the two wheel bodies squeeze each other, which is equivalent to applying axial pressure to the spring mechanism 331 ( Figure 7 In the embodiment of the present invention, the spring mechanism 331 applies an axial force in the first direction corresponding to the spring mechanism 331. Accordingly, the spring mechanism 331 applies an axial pressure in the opposite direction to the auxiliary swing arm 333, and the friction between the two increases. At this time, the spring mechanism 331 is compressed, resulting in an obstruction to the rotation of the auxiliary swing arm 333. This obstruction is transmitted to the main swing arm along with the connecting parts, which is equivalent to the spring mechanism 331 also applying an obstruction to the rotation of the main swing arm (it can also be understood as the damping force provided by the damping assembly 330 composed of the spring mechanism 331 and the auxiliary swing arm 333 to the main swing arm), so that the damping assembly 330 has a damping effect on the rotation of the main swing arm. On the contrary, when the raised portion 333b1 of the cam 333b rotates relatively along the opening direction of the concave wheel 331b toward the bottom of the recessed portion 331b1, the axial pressure gradually weakens, the rotation of the auxiliary swing arm 333 will be smoother, and then the main swing arm will also rotate more smoothly. Therefore, through the relative rotation of the convex-concave wheel 333b and the concave cam 331b, the friction force of the contact surface between the convex-concave wheel 333b and the concave cam 331b can be adjusted, that is, the rotation of the two wheels can adjust the size of the damping force, thereby adjusting the different rotation feel experience brought to the user by the shell during the rotation process, thereby improving the user experience.

[0095] In one embodiment of the present application, the first rotating shaft 331a of the gear mechanism 332 and the second rotating shaft 332d of the spring mechanism 331 are rotating shafts with different axes. Figure 8As shown, the spring mechanism 331 may include four springs 331c, and a first fixing member 331d and a second fixing member 331e for fixing the springs 331c. Each spring 331c corresponds to a first rotating shaft 331a, and is respectively limited between the first fixing seat 331d and the second fixing seat 331e. The gear mechanism 332 may include two second gears 332a, and a third fixing seat 332b and a fourth fixing seat 332c for fixing the second gears 332a. Among them, each second gear 332a corresponds to a second rotating shaft 332d, and is rotatably arranged between the third fixing seat 332b and the fourth fixing seat 332c through the second rotating shaft 332d. In the embodiment of the present application, the first rotating shaft 331a and the second rotating shaft 332d are separated and are not coaxially arranged. That is to say, the spring mechanism 331 and the gear mechanism 332 are two completely independent components. Compared with the existing coaxial setting, that is, the gear and the spring mechanism have the same axis, the gear mechanism 332 and the spring mechanism 331 of the embodiment of the present application are decoupled, and the two are no longer dependent on each other. Both ends of the gear in the gear mechanism 332 can be fixed independently and are no longer disturbed by the rotation force of the spring mechanism 331, so the synchronization accuracy of the two gears can be guaranteed. And for the spring mechanism 331, the spring mechanism 331 is no longer limited by the number of gears, so a larger number of springs 331c and springs 331c of different sizes can be set, which is conducive to the output of a larger spring 331c force and improves the flexibility of the damping force. In addition, there is no limitation of the coaxiality of the gear and the spring, and the processing is easier.

[0096] In the embodiment of the present application, in order to ensure the coaxial arrangement of the auxiliary swing arm 333 and the spring mechanism 331, the auxiliary swing arms 333 (such as Figure 8 The two first rotating shafts 331a of the two auxiliary swing arms 333 above and below the first rotating shaft 331a in the damping assembly 330 are connected to the second fixing seat 331e at one end, and the other ends can pass through the spring 331c, the first fixing seat 331d, the shaft hole of the auxiliary swing arm 333, and the fourth fixing seat 332c, and finally fixed to the third fixing seat 332b. This improves the firmness of the overall connection of the damping assembly 330, and at the same time improves the synchronization of the axial forces on the left and right sides when the auxiliary swing arm 333 and the spring mechanism 331 rotate coaxially.

[0097] It should be noted that the above embodiment is described by taking the example that the number of springs 331c is 4 and the number of gears is 2. In other embodiments, the number of springs 331c can be more or less, for example, 3 or 5; the number of gears can be more or less, for example, 1 or 3, and this is not the only limitation in the embodiments of the present application.

[0098] Again Figure 2As shown, the shaft assembly 300 also includes a connector 334, which is rotatably connected to at least two main swing arms and at least one auxiliary swing arm 333. In one embodiment of the present application, the connector 334 is also slidably connected to the main swing arm and the auxiliary swing arm 333. Through the connection of the connector 334, the synchronization of the main swing arm and the auxiliary swing arm 333 during rotation can be ensured. In addition, one connector 334 is simultaneously connected to at least two main swing arms 320. For the two main swing arms 320, the connector 334 serves as a bridge connecting the two main swing arms, which can not only improve the coaxial rotation ability between the main swing arms 320, but also improve the anti-fall ability of the connector 334 compared with the connection method of a single main swing arm due to the connection of the two main swing arms 320.

[0099] like Figure 2 As shown, the two main swing arms 320 are respectively connected to the two ends of the connecting member 334, which greatly improves the protection capability of the ends of the connecting member 334, further improves the anti-fall performance of the connecting member 334, and combined with the layout structure of the above-mentioned main swing arms 320 on the entire shaft bracket, it can greatly improve the overall strength and firmness of the shaft assembly, thereby improving the overall anti-fall capability of the shaft assembly.

[0100] It should be noted that, regarding the connection structure between the connecting member 334 and the main swing arm 320 and the auxiliary swing arm 333, reference can be made to the description of the prior art, and no detailed description will be given in the embodiments of the present application.

[0101] refer to Fig. 9 , Fig. 9 The schematic diagram of the structure of the door panel of the embodiment of the present application is shown. Fig. 9 As shown, the shaft assembly also includes a door plate 335, which is laid on the main swing arm (corresponding to Figure 2 The main swing arm 320), auxiliary swing arm (corresponding to Figure 2 The auxiliary swing arm 333) and the connecting member (corresponding to Figure 2 The connecting piece 334 in the middle is connected to the main swing arm, the auxiliary swing arm and the connecting piece respectively. The overall linkage of the rotating shaft assembly can be improved, and the display screen can be supported to improve the overall strength of the product.

[0102] like Fig. 9 As shown, the door panel 335 includes a door panel body 3351 and a slide member. Figure 2 The slide member is arranged on the door panel 335, and an arc surface is formed on the surface, which is used to assist the door panel body 3351 to rotate relative to the connecting member along the track of the arc surface.

[0103] In the embodiments of the present application, Fig. 9As shown, the slide member may include a first auxiliary slide member 3352 and a second slide member 3353. The first slide member 3352 is used to realize the sliding connection between the door panel 335 and the connecting member. The second slide member 3353 is used to realize the sliding connection between the door panel 335 and the main swing arm. It should be noted that the principle of the connection method between the door panel 335 and the connecting member, the main swing arm and the auxiliary swing arm can be referred to the description of the prior art, and will not be described in detail here.

[0104] In some embodiments, the door panel body 3351 is integrally formed with the first slide slot 3352 and the second slide slot 3353. For example, the door panel body 3351 and the second slide slot 3353 can be once-injected with high-strength materials, and then the first slide slot 3352, the second slide slot 3353 and the door panel body 3351 are integrally formed by inserting the first slide slot 3352 and the second slide slot 3353 into a single piece, thereby ensuring the overall strength of the door panel 335 and the strength of the kinematic pair, while meeting the processing feasibility and processing accuracy of the product, which is not only conducive to the thinning of the whole machine, but also can ensure the overall strength of the product.

[0105] refer to Fig.10 and Fig.11 , Fig.10 A schematic diagram of the local structure of the rotating shaft assembly of the embodiment of the present application when it is in a folded state; Fig.11 Shows Fig.10 Cross-sectional structure diagram in the AA direction.

[0106] like Fig.10 and Fig.11 As shown, the side of the door panel 335 opposite to the auxiliary swing arm 333 is provided with a first overlap surface 3354. The side of the auxiliary swing arm 333 opposite to the door panel 335 is provided with a second overlap surface 3331. Fig.10 and 11 In the folded state shown, if the door panel 335 moves toward the auxiliary swing arm 333 (as shown in FIG. Fig.11The first overlap surface 3354 abuts against the second overlap surface 3331, thereby preventing the door panel 335 from sliding further downward. For example, after the folding screen mobile phone falls, the corner of the hinge assembly touches the ground and is subjected to force, while the main body of the folding screen mobile phone still moves downward due to inertia. The cooperation between the first overlap surface 3354 and the second overlap surface 3331 can prevent the door panel 335 from moving downward. In this way, it is possible to prevent the door panel 335 from moving too much and to avoid damage to the structure of the components connected thereto, such as the display screen, the structure of the main swing arm and the auxiliary swing arm 333. When the position of the door panel 335 before movement is restored, a gap is formed between the first overlap surface 3354 and the second overlap surface 3331, which can ensure the normal sliding between the door panel 335 and the auxiliary swing arm 333 during normal use. Thereby, the anti-falling ability of the auxiliary swing arm 333 in the event of an accidental fall is improved without affecting normal use.

[0107] In some embodiments of the present application, there may be multiple first lap joints 3354 to form a step shape, and there may also be multiple second lap joints 3331 to form a step shape, and the multiple first lap joints 3354 correspond to the multiple second lap joints 3331 one by one, thereby further improving the anti-falling capability of the auxiliary swing arm 333.

[0108] refer to Fig.12 , Fig.13 and Fig.14 , Fig.12 A schematic diagram of the local structure of the rotating shaft assembly of the embodiment of the present application when it is in an expanded state is shown; Fig.13 Shows Fig.12 The cross-sectional structure diagram along the BB direction; Fig.14 A schematic structural diagram of the main swing arm at another angle of an embodiment of the present application is shown.

[0109] like Fig.12 and Fig.13 As shown, the middle section of the support portion of the rotating shaft bracket 310 (corresponding to Figure 5 On the middle section b), both sides of the end close to the bracket body are provided with expansion stop blocks e. Fig.13 and Fig.14 As shown, one end of the main swing arm 320 facing the deployment stop block e is provided with a first abutting surface 325. When the main swing arm 320 is in the deployed state, the abutting surface of the deployment stop block e abuts against the first abutting surface 325 of the main swing arm 320, thereby limiting the deployment angle of the main swing arm 320 to avoid the deployment angle being too large and affecting the horizontality of the two display screens of the folding screen mobile phone after deployment.

[0110] Combination Fig.14 , and refer to Fig.15 and Fig.16 , Fig.15A schematic diagram showing the structure of the rotating shaft assembly of an embodiment of the present application when it is in a folded state; Fig.16 for Fig.15 Cross-sectional structure diagram in the CC direction.

[0111] like Fig.14 , Fig.15 and 16 As shown, the left section a and the right section c of the support portion 316 of the rotating shaft bracket are provided with folding stop blocks f on opposite sides thereof. Fig.14 and Fig.15 As shown, the ends of the main swing arm 320 connected to the left section a and the right section c are respectively provided with a second abutment surface 326. Fig.16 As shown, when the main swing arm 320 is in a folded state, the second abutting surface 326 abuts against one end surface of the folding stop block f to limit the folding angle of the main swing arm 320 to avoid excessive folding angle and damage to the display screen.

[0112] refer to Fig.17 and Fig.18 , Fig.17 A partial structural schematic diagram showing a rotating shaft assembly in a folded state according to an embodiment of the present application is shown; Fig.18 for Fig.17 Cross-sectional structure diagram in the DD direction.

[0113] like Fig.18 As shown, an arc-shaped slot 3332 is provided at the overlapping position of the auxiliary swing arm 333 and the connecting member 334. When the shaft assembly 300 is in a folded state, that is, when the auxiliary swing arm 333 is in a folded state, the end of the connecting member 334 abuts against the side wall of the arc-shaped slot 3332. In this way, when the auxiliary swing arm 333 drives the connecting member 334 to rotate, the end of the connecting member 334 slides along the arc-shaped surface of the arc-shaped slot 3332. Compared with the traditional straight sliding surface, not only can the sliding of the connecting member 334 and the auxiliary swing arm 333 be achieved, but also relative rotation can be achieved. With this structure, when the connecting member 334 slides relative to the auxiliary swing arm 333, the inclination angle of the auxiliary swing arm 333 can be limited by the abutment of the connecting member 334, thereby limiting the rotation range of the auxiliary swing arm 333, for example, limiting it to less than 90°. Since the lower part of the arc-shaped slot 3332 ( Fig.18 The bottom end of the arc-shaped slide groove 3332 in the inner portion is relatively Fig.18 Therefore, compared with the traditional straight line shape, it is beneficial to increase the thickness of the auxiliary swing arm 333 ( Fig.18 The increased strength helps to increase the selection space for installing the display screen and can enhance the anti-drop capability of the entire axis.

[0114] In summary, the hinge assembly provided in the embodiment of the present application is more inclined to an integrated design, which can maintain the overall strength of the hinge assembly while being overall light and thin, thereby greatly improving the overall performance of the product and meeting customers' needs for lightness, thinness, strength and reliability.

[0115] It should be noted that in the described embodiments of the present application, perpendicularity to each other is not absolute perpendicularity, and the approximate perpendicularity due to processing errors and assembly errors (for example, the angle between the two structural features is 89.9°) is also within the scope of perpendicularity in the present application. The mutual parallelism in the present application is also not absolute parallelism, and the approximate parallelism due to processing errors and assembly errors (for example, the angle between the two structural features is 0.1°) is also within the scope of parallelism in the present application. The axisymmetry in the present application is not absolute axisymmetry, and the approximate axisymmetry due to processing errors and assembly errors (for example, part of the structure is offset by a certain distance or angle relative to the axis of symmetry) is also within the scope of axisymmetry in the present application. The central symmetry in the present application is not absolute central symmetry, and the approximate central symmetry due to processing errors and assembly errors (for example, part of the structure is offset by a certain distance or angle relative to the axis of symmetry) is also within the scope of central symmetry in the present application. The present application does not make specific restrictions on this.

[0116] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0117] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0118] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0119] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A hinge assembly, applied to a foldable electronic device, characterized in that: include: An integrally formed hinge bracket, the hinge bracket extending from a first end of the foldable device to a second end of the foldable device along a first direction, and a middle portion of the hinge bracket having a first section for a flexible circuit board to pass through; At least four groups of main swing arms, each group of main swing arms includes two main swing arms symmetrically arranged on both sides of the rotating shaft bracket, and each main swing arm is rotatably connected to the rotating shaft bracket; four groups of main swing arms among the at least four groups of main swing arms are respectively arranged at the first end, the second end and both sides of the first interval segment of the rotating shaft bracket.

2. The shaft assembly according to claim 1, characterized in that: The rotating shaft support comprises: A bracket body, wherein the bracket body is in the shape of an elongated strip extending along the first direction, and the length of the bracket body along the first direction is the length of the rotating shaft bracket along the first direction; A support portion, wherein the support portion is symmetrically arranged on the support body with the support body as an axis, a slide groove is arranged at an installation position of the support portion corresponding to the main swing arm, and a first arc-shaped sliding surface of the slide groove matches a second arc-shaped sliding surface of the main swing arm; The installation position of the support portion is configured as three sections arranged at intervals, namely a left section, a middle section and a right section, and the slide grooves are respectively arranged on the left section, the middle section and the right section.

3. The shaft assembly according to claim 2, characterized in that: The slide grooves of the left section and the right section are arranged on the lower surface of the support portion, the slide groove of the middle section is arranged on the upper surface of the support portion, and the slide grooves on the left section, the middle section and the right section are coaxial.

4. The shaft assembly according to claim 2, characterized in that: The slide grooves of the left section and the right section are arranged on the upper surface of the support portion, the slide groove of the middle section is arranged on the lower surface of the support portion, and the slide grooves on the left section, the middle section and the right section are coaxial.

5. The shaft assembly according to any one of claims 1 to 4, characterized in that: Also includes: A plurality of damping components, wherein the plurality of damping components are arranged in other sections of the rotating shaft support except the first section; The damping assembly comprises: A spring mechanism, wherein the spring mechanism is mounted on the rotating shaft bracket, and a first rotating shaft of the spring mechanism is arranged along the first direction; A gear mechanism, wherein the gear mechanism is mounted on a frame of the rotating shaft, the second rotating shaft of the gear mechanism is arranged along the first direction, and the first rotating shaft and the second rotating shaft are rotating shafts with different axes; Two auxiliary swing arms are symmetrically arranged with the rotating shaft bracket as the axis, and are rotatably connected to the rotating shaft bracket. The first side of the auxiliary swing arm is meshed with the gear of the gear mechanism, and the other side is abutted with the spring mechanism through the structure of a cam and a cam. When the auxiliary swing arm rotates, the compression force of the spring of the spring mechanism is increased or decreased.

6. The shaft assembly according to claim 5, characterized in that: A convex-concave wheel is provided on one side of the auxiliary swing arm; A concave cam corresponding to the convex-concave wheel is provided on one side of the spring mechanism, and the convex-concave wheel and the concave cam rotate around the first rotating shaft; When the convex-concave wheel and the concave cam rotate around the first rotating shaft to an engaged state, the raised portion on the convex-concave wheel corresponds to the recessed portion of the concave cam, and the recessed portion on the convex-concave wheel corresponds to the raised portion of the concave cam.

7. The shaft assembly according to claim 6, characterized in that: The auxiliary swing arm is provided with a first gear, and the gear mechanism includes a second gear. The first gear is meshed with the second gear, and the auxiliary swing arms on both sides of the rotating shaft bracket are driven to rotate synchronously through the first gear and the second gear.

8. The shaft assembly according to claim 7, characterized in that: The second gears include at least two, and at least two of the second gears are meshed with each other.

9. The shaft assembly according to any one of claims 1 to 3, characterized in that: Also includes: A connecting member is rotatably connected to at least two of the main swing arms and at least one auxiliary swing arm.

10. The shaft assembly according to claim 9, characterized in that: Two main swing arms rotatably connected to the connecting member are respectively located at two ends of the connecting member.

11. The shaft assembly according to claim 9, characterized in that: Also includes: A door panel, wherein the door panel is laid on the main swing arm, the auxiliary swing arm and the connecting member, and is respectively connected to the main swing arm, the auxiliary swing arm and the connecting member; The door panel comprises: A door panel body, wherein the door panel body is rotatably connected to the connecting member; A slide member is arranged on the door panel and has an arc surface formed on the surface, which is used to assist the door panel body to rotate relative to the connecting member along the trajectory of the arc surface. The door panel body and the slide member are formed in one piece.

12. The shaft assembly according to claim 11, characterized in that: A first overlapping surface is provided on a side of the door panel opposite to the auxiliary swing arm; A second overlapping surface is provided on a side of the auxiliary swing arm opposite to the door panel; When the auxiliary swing arm drives the door panel to be in a folded state and the door panel moves toward the auxiliary swing arm, the first overlapping surface abuts against the second overlapping surface. When the door panel returns to the position before the movement, a gap is formed between the first overlapping surface and the second overlapping surface.

13. The shaft assembly according to claim 12, characterized in that: There are a plurality of the first overlapping surfaces, and there are a plurality of the second overlapping surfaces, and the plurality of the first overlapping surfaces corresponds one to one to the plurality of the second overlapping surfaces.

14. The shaft assembly according to claim 2, characterized in that: Deployment stop blocks are provided on both sides of one end of the middle section close to the bracket body. When the main swing arm is in the deployed state, the deployment stop blocks abut against the first abutting surface of the main swing arm to limit the deployment angle of the main swing arm.

15. The shaft assembly according to claim 2, characterized in that: Folding stop blocks are respectively provided on opposite sides of the left section and the right section. When the main swing arm is in a folded state, the folding stop blocks abut against the second abutting surface of the main swing arm to limit the folding angle of the main swing arm.

16. The shaft assembly according to claim 11, characterized in that: An arc-shaped slide groove is provided at the overlapping position of the auxiliary swing arm and the connecting member. When the auxiliary swing arm is in a folded state, the end of the connecting member abuts against the side wall of the arc-shaped slide groove. When the auxiliary swing arm drives the connecting member to rotate, the end of the connecting member slides along the arc-shaped surface of the arc-shaped slide groove.

17. The shaft assembly according to claim 1, characterized in that: The main swing arms are provided in six groups.

18. The shaft assembly according to claim 5, characterized in that: The damping components are provided in four groups.

19. A foldable electronic device, characterized in that: include: A first shell, a second shell and a rotating shaft assembly, wherein the first shell and the second shell are rotatably connected via the rotating shaft assembly, and the rotating shaft assembly is the rotating shaft assembly as described in any one of claims 1-18.

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