Rotating shaft assembly and foldable electronic device

Abstract

The application provides a hinge assembly and a foldable electronic device. The hinge assembly is applied to the foldable electronic device. The hinge assembly comprises: a one-piece hinge support extending from a first end of the foldable device to a second end of the foldable device in a first direction, wherein a middle part of the hinge support has a first interval segment 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 support, and each main swing arm being rotatably connected to the hinge support; and four groups of main swing arms in the at least four groups of main swing arms being arranged at the first end, the second end and both sides of the first interval segment of the hinge support, respectively. The hinge assembly according to the application can ensure the overall strength reliability while ensuring the overall thinness.

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

[0002] Foldable electronic devices (for example, foldable screen mobile phones) can switch between an unfolded state and a folded state, and have both portability and large-screen display effects, and are becoming more and more popular in the market. Among them, the foldable electronic device realizes folding and unfolding through a hinge assembly, and the hinge assembly can include a hinge bracket, a main swing arm, and a damping assembly providing a damping effect, and the like.

[0003] As foldable electronic devices become increasingly thin and light, the hinge assembly also needs to be increasingly thin and light. However, how to ensure the reliability of the hinge assembly while making the hinge assembly thinner and lighter is a problem that needs to be overcome at present. SUMMARY

[0004] Therefore, the present application provides a hinge assembly to solve the problem that the current hinge assembly cannot meet the strength reliability under the condition of meeting the thinness.

[0005] Some embodiments of the present application provide a hinge assembly, which is introduced from multiple aspects below, and the embodiments and advantages of the multiple aspects can be mutually referred to.

[0006] In a first aspect, the present application provides a hinge assembly applied to a foldable electronic device, the hinge assembly comprising: a one-piece 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, the hinge bracket having a first interval section in a middle portion thereof 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 with the hinge bracket; and four groups of main swing arms in the at least four groups of main swing arms being arranged at the first end, the second end, and both sides of the first interval section of the hinge bracket, respectively.

[0007] According to the hinge assembly of the embodiments of the present application, the one-piece hinge bracket is adopted, and the main swing arms are connected at both ends of the hinge bracket and both ends of the flexible circuit board, which can improve the overall strength of the hinge assembly.

[0008] As an embodiment of the first aspect, the hinge bracket comprises:

[0009] a bracket body, the bracket body being in a long strip shape extending along the first direction, a length of the bracket body along the first direction being a length of the hinge bracket along the first direction;

[0010] The support part is symmetrically arranged on the support body, and a sliding groove is arranged at a mounting position of the support part corresponding to the main swing arm.

[0011] The mounting 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 sliding groove is arranged on the left section, the middle section and the right section.

[0012] The distributed sliding groove formed in one piece can reduce the manufacturing tolerance of multiple parts, improve the installation accuracy of the main swing arm and the shaft support, and reduce the installation time and improve the production efficiency.

[0013] As an embodiment of the first aspect, the sliding grooves of the left section and the right section are arranged on the lower surface of the support part, the sliding groove of the middle section is arranged on the upper surface of the support part, and the sliding grooves on the left section, the middle section and the right section are coaxial. It is ensured that the main swing arm can rotate along the axis after cooperating with the sliding groove.

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

[0015] As an embodiment of the first aspect, the shaft assembly further comprises: a plurality of damping assemblies arranged in other interval sections of the shaft support except the first interval section. The damping assembly comprises: a spring mechanism mounted on the shaft support, a first shaft of the spring mechanism arranged in the first direction; a gear mechanism mounted on the shaft support, a second shaft of the gear mechanism arranged in the first direction, and the first shaft and the second shaft are different shafts; two auxiliary swing arms are symmetrically arranged on the shaft support, and are rotatably connected with the shaft support, and the first side of the auxiliary swing arm is engaged with the gear of the gear mechanism, and the other side is abutted with the spring mechanism through the structure of cam and groove, when the auxiliary swing arm rotates, the compression force of the spring of the spring mechanism increases or decreases. By the relative rotation of the cam and the groove, the friction force of the contact surface of the cam and the groove can be adjusted, and the different rotation feeling experience of the shell to the user in the rotation process is improved, and the user experience is improved.

[0016] As an embodiment of the first aspect, one side of the auxiliary swing arm is provided with a convex-concave wheel; one side of the spring mechanism is provided with a concave-convex wheel corresponding to the convex-concave wheel, and the convex-concave wheel and the concave-convex wheel rotate around the first rotating shaft; when the convex-concave wheel and the concave-convex wheel rotate around the first rotating shaft to the meshing state, the convex part on the convex-concave wheel corresponds to the concave part of the concave-convex wheel, and the concave part on the convex-concave wheel corresponds to the convex part of the concave-convex wheel. By the convex-concave structure cooperation, the compression force of the spring is changed when the auxiliary swing arm rotates, the rotation of the auxiliary swing arm provides damping force, thereby providing damping effect for the rotation function of the entire rotating shaft assembly, and improving the hand feeling of the user when rotating and folding the screen mobile phone.

[0017] As an embodiment of the first aspect, a first gear is arranged on the auxiliary swing arm, the gear mechanism includes a second gear, the first gear is engaged with the second gear, and the first gear drives the auxiliary swing arms on both sides of the rotating shaft support to rotate synchronously through 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 engaged with each other.

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

[0020] As an embodiment of the first aspect, the two main swing arms rotatably connected with the connecting piece are respectively located at two ends of the connecting piece. The anti-falling performance of the connecting piece is further improved.

[0021] As an embodiment of the first aspect, the rotating shaft assembly further includes a door plate arranged on the main swing arm, the auxiliary swing arm and the connecting piece and connected with the main swing arm, the auxiliary swing arm and the connecting piece. The overall linkage of the rotating shaft assembly is improved, and the door plate can support the display screen and improve the overall strength of the product. The door plate includes a door plate body rotatably connected with the connecting piece, and a sliding groove arranged on the door plate and having an arc surface on the surface for assisting the door plate body to rotate along the track of the arc surface relative to the connecting piece. The door plate body and the sliding groove are integrally formed. The overall strength and the kinematic pair strength of the door plate are ensured, the processing feasibility and the processing precision of the product are met, the overall strength of the product is ensured, and the overall thickness of the machine is reduced.

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

[0023] As one embodiment of the first aspect, the first lapping surface is provided on the side of the door panel opposite to the auxiliary swing arm, the second lapping surface is provided on the side of the auxiliary swing arm opposite to the door panel, when the door panel is in the folded state and moves towards the auxiliary swing arm, the first lapping surface abuts against the second lapping surface, and when the door panel returns to the position before the movement, a gap is formed between the first lapping surface and the second lapping surface. Thus, the anti-falling ability of the auxiliary swing arm is improved without affecting the normal use.

[0024] As one embodiment of the first aspect, the two sides of the end of the intermediate section close to the support body are provided with unfolding stop blocks, the unfolding stop blocks abut against the first abutting surface of the main swing arm when the main swing arm is in the unfolded state, so as to limit the unfolding angle of the main swing arm. When the main swing arm is in the unfolded state, the abutting surface of the unfolding stop block abuts against the first abutting surface of the main swing arm, so as to limit the unfolding angle of the main swing arm, avoid the unfolding angle being too large, and affect the horizontal degree of the two display screens of the foldable screen mobile phone after unfolding.

[0025] As one embodiment of the first aspect, the opposite sides of the left side section and the right side section are respectively provided with folding stop blocks, the folding stop blocks abut against the second abutting surface of the main swing arm when the main swing arm is in the folded state, so as to limit the folding angle of the main swing arm. Avoid the folding angle being too large and damaging the display screen.

[0026] As one embodiment of the first aspect, the position of the auxiliary swing arm overlapping with the connecting piece is provided with an arc-shaped sliding groove, when the auxiliary swing arm is in the folded state, the end of the connecting piece abuts against the side wall of the arc-shaped sliding groove, when the auxiliary swing arm drives the connecting piece to rotate, the end of the connecting piece slides along the arc-shaped surface of the arc-shaped sliding groove. Compared with the traditional straight line shape, it is beneficial to improve the thickness of the auxiliary swing arm, the strength of the auxiliary swing arm is enhanced, the selection space of the installed display screen is improved, and the overall anti-falling ability of the shaft is enhanced.

[0027] As one embodiment of the first aspect, the main swing arm is provided with six groups, increasing the number of the main swing arm can improve the overall strength of the shaft assembly.

[0028] As one embodiment of the first aspect, the damping assembly is provided with four groups, which can not only improve the overall strength of the shaft assembly, but also improve the opening and closing feeling of the equipment in cooperation with the main swing arm.

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

[0030] Figure 1 A schematic view of the unfolded state, intermediate state and folded state of the folding screen mobile phone provided by the embodiment of the present application;

[0031] Figure 2 A top view of the hinge assembly in the unfolded state provided by the embodiment of the present application;

[0032] Figure 3 A bottom view of the hinge assembly in the unfolded state provided by the embodiment of the present application;

[0033] Figure 4 A top view of the hinge support provided by the embodiment of the present application;

[0034] Figure 5 A partial structural schematic view of the hinge support provided by the embodiment of the present application;

[0035] Figure 6 A three-dimensional structural schematic view of the main swing arm provided by the embodiment of the present application;

[0036] Figure 7 A structural schematic view of the damping assembly provided by the embodiment of the present application;

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

[0038] Figure 9 A structural schematic view of the door plate provided by the embodiment of the present application;

[0039] Figure 10 A partial structural schematic view of the hinge assembly in the folded state provided by the embodiment of the present application;

[0040] Figure 11 A sectional view of the A-A direction in Figure 10 ;

[0041] Figure 12 A partial structural schematic view of the hinge assembly in the unfolded state provided by the embodiment of the present application;

[0042] Figure 13 A sectional view of the B-B direction in Figure 12 ;

[0043] Figure 14 A structural schematic view of the main swing arm from another angle provided by the embodiment of the present application;

[0044] Figure 15 A structural schematic view of the hinge assembly in the folded state from another angle provided by the embodiment of the present application;

[0045] Figure 16For Figure 15 a sectional view in the direction of C-C in FIG. 11B;

[0046] Figure 17 a partial structural schematic view of the hinge assembly in the folded state from another angle provided by the embodiments of the present application;

[0047] Figure 18 For Figure 17 a sectional view in the direction of D-D in FIG. 11B.

[0048] Reference signs:

[0049] folding screen mobile phone 1000;

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

[0051] second housing 200; second screen 210;

[0052] hinge assembly 300;

[0053] hinge support 310; first interval segment 311; second interval segment 312; first end 313; second end 314; support body 315; support part 316; mounting position 317; left side segment a; middle segment b; right side segment c; first sliding groove a1; second sliding groove c1; third sliding groove b1; first arc-shaped sliding surface a11; unfolding stop block e; folding stop block f;

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

[0055] damping assembly 330;

[0056] spring mechanism 331; first hinge shaft 331a; concave-convex cam 331b; concave part 331b1; spring 331c; first fixed seat 331d; second fixed seat 331e;

[0057] gear mechanism 332; second gear 332a; third fixed seat 332b; fourth fixed seat 332c; second hinge shaft 332d;

[0058] auxiliary swing arm 333; first gear 333a; convex-concave cam 333b; convex part 333b1; second lapping surface 3331; arc-shaped sliding groove 3332;

[0059] connecting piece 334;

[0060] door plate 335; door plate body 3351; first sliding groove piece 3352; second sliding groove piece 3353; first lapping surface 3354. DETAILED DESCRIPTION

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

[0062] The foldable electronic device in the embodiments of the present application will be described in detail in combination with the drawings.

[0063] In the embodiments of the present application, the foldable electronic device can be but is not limited to a foldable screen mobile phone, and can also be a tablet personal computer, an electronic book reader, a laptop computer, a personal digital assistant (PDA), a personal computer, a notebook computer, a vehicle-mounted device, a wearable device (for example, a watch), and the like, which need to be opened and closed. In the following embodiments, the structure of the foldable electronic device is described by taking the foldable screen mobile phone as an example.

[0064] Please refer to Figure 1 , Figure 1 The process from the unfolded state to the folded state of the foldable screen mobile phone in the embodiments of the present application is shown. Among them, Figure 1 (a) in FIG. 1 is a structural schematic diagram of the foldable screen mobile phone in the embodiments of the present application in a fully unfolded state; Figure 1 (b) in FIG. 1 is a structural schematic diagram of the foldable screen mobile phone in the embodiments of the present application switching from the unfolded state to the folded state; Figure 1 (c) in FIG. 1 is a structural schematic diagram of the foldable screen mobile phone in the embodiments of the present application in a folded state.

[0065] As shown in Figure 1 , the foldable screen mobile phone 1000 includes a first housing 100, a second housing 200, and a rotating shaft assembly 300 (i.e., a hinge device). The first housing 100 and the second housing 200 are rotatably connected through the rotating shaft assembly 300. In different use states, the user can rotate the first housing 100 and the second housing 200 relative to each other around the rotating shaft assembly 300 to realize different use states of the unfolded state and the folded state of the foldable screen mobile phone 1000. As shown in Figure 1 (a), when the first housing 100 rotates around the rotating shaft assembly 300 by an angle of 0, the foldable screen mobile phone 1000 is in a fully unfolded use state (which can be understood as an unfolded state). As shown in Figure 1 (b), the first housing 100 rotates around the rotating shaft assembly 300 in the direction of the second housing 200, and when the rotation angle is 180°, the foldable screen mobile phone 1000 in a fully closed state (which can be understood as a folded state) is obtained as shown in Figure 1 (c).

[0066] It should be noted that slight deviations are allowed in the angles illustrated in this application. For example, when the foldable phone 1000 is in the open state, its opening angle can be 180°, or approximately 180°, such as 170°, 175°, 185°, or 190°. Within a certain range of angles differing from 180°, the corresponding rotation angles 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 understand that this application does not limit the specific structure of the foldable screen phone 1000. For example, the foldable screen phone 1000 may also include various electronic components, which, together with the first housing 100, the second housing 200, and the hinge assembly 300, constitute the foldable screen phone 1000. The first housing 100, the second housing 200, and the hinge assembly 300 provide protection and support for the various electronic components and other structures. To facilitate understanding of the folding process and usage scenarios of the foldable screen phone 1000, the following exemplarily describes its possible structures. Furthermore, in the embodiments of this application, the foldable screen phone can be an inward-folding screen phone, that is, in the folded state of the foldable screen phone, the display screen is retracted between the two housings.

[0068] like Figure 1 As shown, in one embodiment, the foldable screen phone 1000 further includes a display screen, which is disposed on one side of the housing assembly consisting of a first housing 100, a second housing 200, and a hinge assembly 300. A portion of the display screen mounted on the first housing 100 may be referred to as the first screen 110, and a portion of the display screen mounted on the second housing 200 may be referred to as the second screen 210. The first screen 110 and the second screen 210 can be a single, continuous screen. Figure 1 As shown in (b), driven by the pivot assembly 300, the first screen 110 rotates around the pivot assembly 300 with the first housing 100 to achieve an unfolded or folded state with the second screen 210 on the second housing 200. In the embodiments of this 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 (AMOLED) display screen, or a quantum dot light-emitting diode (QLED) display screen, etc., and this application does not impose any limitations on this.

[0069] In an embodiment, the first housing 100 and the second housing 200 each have a receiving space inside to accommodate some electronic components. The electronic components include, but are not limited to, a circuit board, a battery, a camera module, a microphone, a speaker, etc., and the present application does not limit this.

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

[0071] In the drawings, the x direction is the length direction of the unfolded folding-screen mobile phone and each component (e.g., a display screen) of the folding-screen mobile phone, the y direction is the width direction of the unfolded folding-screen mobile phone and each component of the folding-screen mobile phone, and the z direction is the thickness direction of the folding-screen mobile phone and each component of the folding-screen mobile phone. In the embodiments of the present application, the first direction can be the y-axis direction, and the second direction can be the z-axis direction.

[0072] Please refer to Figure 2 and Figure 3 , Figure 2 Fig. 1 shows a top view of the hinge assembly of the present application in an unfolded state; Figure 3 Fig. 2 shows a bottom view of the hinge assembly of the present application in an unfolded state.

[0073] As shown in Figure 2 and Figure 3 , the hinge assembly 300 includes a hinge bracket 310 and six sets of main swing arms 320. The six sets of main swing arms are used to drive two middle frames (e.g., the first housing 100 and the second housing 200 in Figure 1 ) of the folding-screen mobile phone to 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 (one end on the left in Figure 2 ) of the folding-screen mobile phone to the second end 314 (one end on the right in Figure 2 ) of the folding-screen mobile phone along the first direction. 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 hinge bracket 310 along the first direction can be divided into multiple segments, as shown in Figure 2 , a first interval segment 311 is arranged at the middle part of the hinge bracket 310. The first interval segment 311 can be used to lay a flexible printed circuit (FPC) (not shown in the figure), which is used as a conductor to connect two circuit boards of the folding-screen mobile phone. It should be noted that the specific structure of the flexible printed circuit and the connection mode with the two circuit boards can refer to the prior art, and the embodiments of the present application will not be described in detail.

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

[0076] As shown in Figure 2 or Figure 3 , six groups of main swing arms 320 are arranged on the rotating shaft support 310 along the first direction. By arranging a large 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, for example, seven or eight. Alternatively, the number of groups of main swing arms 320 can be less than six, for example, four or five. It should be noted that the spacing between each group of main swing arms 320 can not be equal, that is, the uniformity described in the embodiments of the present application is relative, and there can be a case where the spacing is not equal. For example, due to the first interval section 311 of the rotating shaft support 310, the distance between the two end main swing arms 320 is greater than the distance between the other main swing arms 320 on the same side of the second interval section 312. At this time, the uniformity is not absolute uniformity.

[0077] As shown in Figure 2 or Figure 3 , in the unfolded state of the mobile phone, each group of main swing arms 320 can include two main swing arms 320, and the two main swing arms 320 are symmetrically arranged on both sides of the rotating shaft support 310 along the second direction (the x-axis direction of the mobile phone in the unfolded state shown in (a) of Figure 1 ).

[0078] In the embodiments 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. Here, the perpendicular is not absolute perpendicular, but can be approximately perpendicular 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 arranged at the first end 313 of the rotating shaft support 310, the second end 314 of the rotating shaft support 310, and both sides of the first interval section 311 along the first direction. That is, one group of main swing arms 320 is arranged at each of the two ends of the outermost edge of the rotating shaft support 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 (b) of Figure 1When the folding screen mobile phone is in the folded state (as shown in (c) in FIG. 1), the first end 313 and the second end 314 of the rotation shaft support 310 are exactly two corners of the folding screen mobile phone, and the corners of the folding screen mobile phone are the first to touch the ground when falling, which is the most easily damaged place. Therefore, arranging the main swing arm 320 near the first end 313 and the second end 314 can further provide support for the rotation shaft support 310 and improve the overall strength of the rotation shaft support 310. In addition, as shown in Figure 2 , a set of main swing arms 320 is arranged on each side of the section of the rotation shaft support 310 for laying the flexible circuit board (corresponding to the first section 311), which can strengthen the strength of the rotation shaft support 310 on both sides of the flexible circuit board and better protect 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 rotation shaft support 310.

[0081] Referring to Figure 4 , Figure 4 FIG. 1 shows a top view of the rotation shaft support according to an embodiment of the present application. As shown in Figure 4 , the rotation shaft support 310 includes a support body 315 and a support part 316. The support body 315 is a long strip shape extending in a first direction, and the length of the support body 315 in the first direction is the length of the rotation shaft support 310 in the first direction. The support part 316 is symmetrically arranged on the support body 315 with the support body 315 as the axis.

[0082] In an embodiment of the present application, the connection position corresponding to the main swing arm on the support part 316 can be provided with a sliding groove, and the sliding groove is provided with an arc-shaped sliding surface. The arc-shaped sliding surface matches the arc-shaped sliding surface arranged on the main swing arm 320, and the two arc-shaped sliding surfaces abut each other. Through this connection mode, the main swing arm can slide along the curvature of the arc-shaped sliding surface, which is conducive to controlling the sliding angle of the main swing arm.

[0083] In an embodiment of the present application, as shown in Figure 4 , in order to be connected with other components, such as the main swing arm, the damping assembly and the like, the support part 316 is configured in multiple sections with intervals between the sections. For example, taking the connection with the main swing arm (corresponding to the main swing arm 320 in Figure 2 ) as an example, the intervals are used to accommodate a part of the main swing arm to realize the rotatable connection between the main swing arm and the rotation shaft support 310. The specific structure of the support part will be described below with reference to the drawings.

[0084] Referring to Figure 5 and Figure 6 , Figure 5 FIG. 2 shows a partial structure schematic diagram of the rotation shaft support according to an embodiment of the present application; Figure 6 FIG. 3 shows a three-dimensional structure schematic diagram of the main swing arm according to an embodiment of the present application.

[0085] As shown in Figure 5 , the mounting position 317 for connecting or mounting the main swing arm 320 on the rotating shaft support 310 is divided into a left side section a (corresponding to the left side in Figure 5 ), a middle section b and a right side section c (corresponding to the right side in Figure 5 ). The sliding grooves are respectively arranged on the left side section a, the middle section b and the right side section c. The sliding groove on the left side section a corresponds to a first sliding groove a1, the sliding groove on the right side section c is a second sliding groove c1, and the sliding groove on the middle section b is a third sliding groove b1. The first sliding groove a1, the second sliding groove c1 and the third sliding groove b1 constitute a distributed sliding groove.

[0086] As shown in Figure 6 , the end of the main swing arm 320 connected with the rotating shaft support (corresponding to the rotating shaft support 310 in Figure 5 ) also forms a sliding groove, which is also divided into three sections. The arc-shaped sliding surface of the sliding groove on the main swing arm 320 matches the arc-shaped sliding surface of the sliding groove on the support part 316, facilitating the sliding and rotating connection of the main swing arm 320 and the rotating shaft support. This integrated distributed sliding groove design can reduce the manufacturing tolerance size of multiple parts and improve the installation accuracy of the main swing arm 320 and the rotating shaft support compared with the traditional connection mode of multiple parts rotating with the swing arm. In addition, since it is the installation of a single part, the installation time can be reduced and the production efficiency can be improved.

[0087] In the above Figure 5 and Figure 6 described embodiments, the sliding grooves of the left side section a and the right side section c are respectively arranged on the lower surface (such as the lower surface corresponding to the left side section a and the right side section c in Figure 5 ), and the sliding groove of the middle section b is arranged on the upper surface (such as the upper surface corresponding to the middle section b in Figure 5 ). In some embodiments, the sliding grooves on the left side section a and the right side section c can be arranged on the upper surfaces thereof, and the sliding groove on the middle section b can be arranged on the lower surface. Alternatively, the sliding groove on the left side section a is located on the upper surface, and the sliding grooves on the middle section b and the right side section c are arranged on the lower surfaces. Alternatively, the sliding grooves on the left side section a and the middle section b are arranged on the lower surfaces, and the sliding groove on the right side section c is arranged on the upper surface, etc. The arrangement of the sliding grooves on the different sections in the embodiments of the present application is not limited to the above.

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

[0089] Referring back to Figure 2 , the rotating shaft assembly 300 further includes four sets of damping assemblies 330, which are arranged in the second interval segment 312 of the rotating shaft support 310, which is the interval segment of the rotating shaft support 310 other than the first interval segment 311. Among them, the damping assembly 330 is used to assist the main swing arm 320 to drive the first shell and the second shell (corresponding to the first shell 100 and the second shell 200 in Figure 1 , can realize the synchronous rotation of the first shell and the second shell, and the damping assembly can provide the main swing arm with a rotational resistance, so that the hand feeling of the mobile phone during the folding and unfolding process can be improved. In some embodiments of the present application, the number of damping assemblies 330 can be greater than four, for example, it can be five, six or more, or less. The specific structure and working principle of the damping assembly 330 will be described below with reference to the accompanying drawings.

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

[0091] AsFigure 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 a first direction on the rotating shaft bracket 310. The gear mechanism 332 is mounted on the rotating shaft bracket (corresponding to the shaft bracket 310). Figure 2 On the rotating shaft support 310, 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 about the rotating shaft support as the axis and are rotatably connected to the rotating shaft support.

[0092] In the embodiments of this 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. In this way, when switching between the unfolded and folded states, the main swing arm on the pivot assembly is subjected to more uniform force, and the damping force in the first direction is more uniform.

[0093] First, the principle of synchronous rotation of the auxiliary swing arms 333 on both sides of the drive shaft bracket by the damping component 330 is described. For example... Figure 7 and Figure 8 As shown, a first gear 333a is provided on the first side of the auxiliary rocker arm 333, and the gear mechanism 332 includes a second gear 332a, with the first gear 333a meshing with the second gear 332a. A cam and cam wheel 333b are formed on the other side (connecting shaft) of the auxiliary rocker arm 333, and a concave cam 331b is formed at the end of the spring mechanism 331 that abuts against the auxiliary rocker arm 333. The auxiliary rocker arm 333 and the spring mechanism 331 abut against each other through the structure of the cam and cam wheel 333b and the concave cam 331b. Figure 7 and 8 As shown, both the concave and convex wheel 333b and the concave cam 331b include sawtooth-like recesses and protrusions, forming an undulating sawtooth structure. The two wheels are meshed together. When the secondary swing arm 333 rotates, the concave cam 331b and the concave and convex wheel 333b can rotate relative to each other around the same axis. This relative rotation of the concave cam 331b and the concave and convex wheel 333b can further drive the first and second housings of the foldable screen phone (corresponding to...) Figure 1 The first housing 100 and the second housing 200 rotate relative to each other. This helps the foldable phone to rotate simultaneously on both sides in the unfolded and folded states, improving the feel of automatic opening and closing.

[0094] The above description continues with the damping component 330 as the main swing arm (e.g., Figure 3 The process by which the main swing arm 320 in the middle provides damping force. For example... Figure 7 and Figure 8As shown, the end faces of the convex-concave wheel 331b and the concave-convex wheel 333b in contact with each other are provided with irregular tooth-like structures. When the concave-convex wheel 333b and the convex-concave wheel 331b are fully engaged, the recesses of the concave-convex wheel 333b correspond to the protrusions of the convex-concave wheel 331b, and the protrusions of the concave-convex wheel 333b correspond to the recesses of the convex-concave wheel 331b. Hereinafter, an example is described in which the concave-convex wheel 333b is provided with a plurality of protrusions 333b1 protruding outward, and the convex-concave wheel 331b is provided with a plurality of recesses 331b1 recessed inward. Figure 7 As shown, when the sub-swing arm 333 rotates, the protrusions 333b1 of the concave-convex wheel 333b slide along the side walls of the recesses 331b1 of the convex-concave wheel 331b. When the protrusions 333b1 of the concave-convex wheel 333b move along the bottoms of the recesses 331b1 of the convex-concave wheel 331b toward the opening direction of the recesses 331b1, the two wheel bodies press against each other, which is equivalent to applying an axial pressure to the spring mechanism 331 (corresponding to applying an axial force in the first direction in the middle). Figure 7 Correspondingly, the spring mechanism 331 applies an axial pressure in the opposite direction to the sub-swing arm 333, and the friction between the two increases. At this time, the spring mechanism 331 is compressed, which hinders the rotation of the sub-swing arm 333, and this hindering force is transmitted to the main swing arm through the connecting member and other components, which is equivalent to the spring mechanism 331 applying a hindering force to the rotation of the main swing arm (which can also be understood as the damping assembly 330 formed by the spring mechanism 331 and the sub-swing arm 333 providing a damping force to the main swing arm), so that the damping assembly 330 plays a damping role in the rotation of the main swing arm. Conversely, when the protrusions 333b1 of the concave-convex wheel 333b relatively rotate along the opening direction of the convex-concave wheel 331b toward the bottoms of the recesses 331b1, the axial pressure gradually weakens, and the rotation of the sub-swing arm 333 and the main swing arm becomes smoother. Thus, by relatively rotating the convex-concave wheel 333b and the concave-convex wheel 331b, the friction of the contact surfaces of the convex-concave wheel 333b and the concave-convex wheel 331b can be adjusted, i.e., the rotation of the two wheels can adjust the size of the damping force, and thus the different rotating hand feeling experiences brought to the user during the rotation of the housing can be adjusted, and the user experience can be improved.

[0095] In an 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 different shafts. As shown, Figure 8As shown, the spring mechanism 331 can include 4 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 limited between the first fixing seat 331d and the second fixing seat 331e. The gear mechanism 332 can include 2 second gears 332a, and a third fixing seat 332b and a fourth fixing seat 332c for fixing the second gears 332a. 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 not coaxially arranged. That is, the spring mechanism 331 and the gear mechanism 332 are two completely independent components. Compared with the existing coaxial arrangement, that is, the shafts of the gear and the spring mechanism are the same, the gear mechanism 332 and the spring mechanism 331 of the embodiment of the present application are decoupled and no longer dependent on each other. The two ends of the gear in the gear mechanism 332 can be independently fixed and no longer disturbed by the rotating force of the spring mechanism 331, so as to ensure the synchronization accuracy of the two gears. For the spring mechanism 331, the spring mechanism 331 is no longer limited by the number of gears, so that more number of springs 331c and springs 331c of different sizes can be arranged, which is beneficial to the output of larger force of the spring 331c and improves the flexibility of the damping force. In addition, there is no coaxial restriction 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 two first rotating shafts 331a near the two auxiliary swing arms 333 (such as the two auxiliary swing arms 333 above and below the first rotating shaft 331a in the Figure 8 , one end of the two first rotating shafts 331a is connected with the second fixing seat 331e, and the other end 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 is finally fixed on the third fixing seat 332b. Thus, the firmness of the overall connection of the damping assembly 330 is improved, and the synchronization of the axial forces on the left and right sides is maintained 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 number of springs 331c as 4 and the number of gears as 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. The number of gears is not uniquely limited in the embodiment of the present application.

[0098] Again, as shown in FIG. 6, the damping assembly 330 can include a spring mechanism 331 and a gear mechanism 332. The spring mechanism 331 can include a plurality of springs 331c, and a first fixing seat 331d and a second fixing seat 331e for fixing the springs 331c. Each spring 331c corresponds to a first rotating shaft 331a and is limited between the first fixing seat 331d and the second fixing seat 331e. The gear mechanism 332 can include a plurality of gears 332a, and a third fixing seat 332b and a fourth fixing seat 332c for fixing the gears 332a. Each 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 not coaxially arranged. That is, the spring mechanism 331 and the gear mechanism 332 are two completely independent components. Compared with the existing coaxial arrangement, that is, the shafts of the gear and the spring mechanism are the same, the gear mechanism 332 and the spring mechanism 331 of the embodiment of the present application are decoupled and no longer dependent on each other. The two ends of the gear in the gear mechanism 332 can be independently fixed and no longer disturbed by the rotating force of the spring mechanism 331, so as to ensure the synchronization accuracy of the two gears. For the spring mechanism 331, the spring mechanism 331 is no longer limited by the number of gears, so that more number of springs 331c and springs 331c of different sizes can be arranged, which is beneficial to the output of larger force of the spring 331c and improves the flexibility of the damping force. In addition, there is no coaxial restriction of the gear and the spring, and the processing is easier. Figure 2As shown in the figure, the rotating shaft assembly 300 further comprises a connecting piece 334, which is rotatably connected with the at least two main swing arms and the at least one auxiliary swing arm 333. In an embodiment of the present application, the connecting piece 334 is also slidably connected with the main swing arms and the auxiliary swing arm 333. Through the connection of the connecting piece 334, the synchronism of the main swing arms and the auxiliary swing arm 333 during rotation can be ensured. In addition, one connecting piece 334 is connected with at least two main swing arms 320 at the same time, and for the two main swing arms 320, the connecting piece 334 serves as a bridge connecting the two main swing arms, which not only improves the coaxial rotation ability between the main swing arms 320, but also improves the anti-falling ability of the connecting piece 334 compared with the connection mode of a single main swing arm.

[0099] As shown in the figure, Figure 2 the two main swing arms 320 are connected to the two ends of the connecting piece 334, respectively, and the protection ability of the end of the connecting piece 334 is greatly improved, further improving the anti-falling performance of the connecting piece 334. Combined with the above-mentioned layout structure of the main swing arms 320 on the entire rotating shaft support, the overall strength and firmness of the rotating shaft assembly can be greatly improved, and the overall anti-falling ability of the rotating shaft assembly is further improved.

[0100] It should be noted that the connection structure between the connecting piece 334 and the main swing arms 320 and the auxiliary swing arm 333 can refer to the description of the prior art, and will not be described in detail in the embodiment of the present application.

[0101] Referring to Figure 9 , Figure 9 a structural schematic view of a door plate of an embodiment of the present application is shown. As shown in the figure, Figure 9 the rotating shaft assembly further comprises a door plate 335, which is laid on the main swing arms (corresponding to the main swing arms 320 in Figure 2 , the auxiliary swing arms (corresponding to the auxiliary swing arms 333 in Figure 2 ) and the connecting pieces (corresponding to the connecting pieces 334 in Figure 2 ), and is connected with the main swing arms, the auxiliary swing arms and the connecting pieces, respectively. The overall linkage of the rotating shaft assembly can be improved, and the door plate can also support the display screen to improve the overall strength of the product.

[0102] As shown in the figure, Figure 9 the door plate 335 comprises a door plate body 3351 and a sliding groove piece. The door plate body 3351 is rotatably connected with the connecting pieces (corresponding to the connecting pieces 334 in Figure 2 ). The sliding groove piece is arranged on the door plate 335, and the surface of the sliding groove piece is formed with an arc surface, which is used to assist the door plate body 3351 to rotate relative to the connecting pieces along the track of the arc surface.

[0103] In the embodiment of the present application, as shown in the figure, Figure 9As shown, the sliding mechanism may include a first sliding mechanism 3352 and a second sliding mechanism 3353. The first sliding mechanism 3352 is used to achieve a sliding connection between the door panel 335 and the connector. The second sliding mechanism 3353 is used to achieve a sliding connection between the door panel 335 and the main swing arm. It should be noted that the principles of the connection methods between the door panel 335 and the connector, the main swing arm, and the secondary swing arm can be found in the description of existing technology, and will not be detailed here.

[0104] In some embodiments, the door panel body 3351, the first sliding groove 3352, and the second sliding groove 3353 are integrally formed. For example, the door panel body 3351 and the second sliding groove 3353 can be injection molded from high-strength materials in one step, and then the first sliding groove 3352 and the second sliding groove 3353 can be integrally formed with the door panel body 3351 by a secondary in-mold insertion injection molding method. This ensures the overall strength and kinematic strength of the door panel 335, while meeting the processing feasibility and processing accuracy of the product. This not only helps to reduce the thickness of the whole machine, but also ensures the overall strength of the product.

[0105] refer to Figure 10 and Figure 11 , Figure 10 A partial structural schematic diagram of the pivot assembly in a folded state according to an embodiment of this application is shown; Figure 11 It shows Figure 10 The cross-sectional structure diagram along the AA direction.

[0106] like Figure 10 and Figure 11 As shown, the door panel 335 has a first overlapping surface 3354 on the side opposite to the auxiliary swing arm 333. The auxiliary swing arm 333 has a second overlapping surface 3331 on the side opposite to the door panel 335. When the auxiliary swing arm 333 moves the door panel 335 to a position as shown... Figure 10 and 11 When the door panel 335 moves toward the auxiliary swing arm 333 in the folded state shown (e.g., when the door panel 335 moves toward the auxiliary swing arm 333), Figure 11As shown (moving downwards), the first overlapping surface 3354 abuts against the second overlapping surface 3331, thereby preventing the door panel 335 from sliding further downwards. For example, after a foldable phone falls, the corner of the hinge assembly hits the ground and bears the force, while the main body of the foldable phone continues to move downwards due to inertia. Through the cooperation of the first overlapping surface 3354 and the second overlapping surface 3331, the downward movement distance of the door panel 335 can be prevented. This avoids excessive movement of the door panel 335 and prevents damage to the connected component structures, such as the display screen, the main swing arm, and the secondary swing arm 333. When the door panel 335 returns to its original position, a gap is formed between the first overlapping surface 3354 and the second overlapping surface 3331, ensuring normal sliding between the door panel 335 and the secondary swing arm 333 during normal use. This improves the drop resistance of the secondary swing arm 333 in the event of an accidental drop without affecting normal use.

[0107] In some embodiments of this application, multiple first overlapping surfaces 3354 can be provided to form a stepped shape, and multiple second overlapping surfaces 3331 can also be provided to form a stepped shape, with each of the multiple first overlapping surfaces 3354 corresponding to one of the multiple second overlapping surfaces 3331. This further improves the drop resistance at the auxiliary swing arm 333.

[0108] refer to Figure 12 , Figure 13 and Figure 14 , Figure 12 A partial structural schematic diagram of the rotating shaft assembly in the unfolded state according to an embodiment of this application is shown; Figure 13 It shows Figure 12 A cross-sectional view of the structure along the BB direction; Figure 14 A schematic diagram of the main swing arm from another angle of an embodiment of this application is shown.

[0109] like Figure 12 and Figure 13 As shown, the middle section of the support part of the pivot bracket 310 (corresponding to) Figure 5 On the middle section b), expansion stop blocks e are provided on both sides near one end of the support body. For example... Figure 13 and Figure 14 As shown, the main swing arm 320 has a first abutment surface 325 at one end facing the unfolding stop block e. When the main swing arm 320 is in the unfolded state, the abutment surface of the unfolding stop block e abuts against the first abutment surface 325 of the main swing arm 320, thereby limiting the unfolding angle of the main swing arm 320 and preventing the unfolding angle from being too large, which would affect the horizontality of the two displays of the foldable screen phone after unfolding.

[0110] Combination Figure 14 and refer to Figure 15 and Figure 16 , Figure 15Fig. 2 shows a structural schematic diagram of the hinge assembly in the folding state according to an embodiment of the present application; Figure 16 For Figure 15 Fig. 4 is a sectional structural diagram of the C-C direction in Fig. 3.

[0111] As Figure 14 , Figure 15 and 16 shown, the opposite side of the left side section a and the right side section c of the support part 316 of the hinge support is respectively provided with a folding stop block f. As Figure 14 and Figure 15 shown, the end of the main swing arm 320 connected with the left side section a and the right side section c is respectively provided with a second abutting surface 326. As Figure 16 shown, the second abutting surface 326 abuts against the end surface of the folding stop block f when the main swing arm 320 is in the folding state, so as to limit the folding angle of the main swing arm 320, avoiding that the folding angle is too large and damaging the display screen and the like.

[0112] Referring to Figure 17 and Figure 18 , Figure 17 Fig. 5 shows a partial structural schematic diagram of the hinge assembly in the folding state according to an embodiment of the present application; Figure 18 For Figure 17 Fig. 6 is a sectional structural diagram of the D-D direction in Fig. 5.

[0113] As Figure 18 shown, the position of the sub-swing arm 333 overlapping with the connecting piece 334 is provided with an arc-shaped sliding groove 3332. When the hinge assembly 300 is in the folding state, i.e., the sub-swing arm 333 is in the folding state, the end of the connecting piece 334 abuts against the side wall of the arc-shaped sliding groove 3332. In this way, when the sub-swing arm 333 drives the connecting piece 334 to rotate, the end of the connecting piece 334 slides along the arc surface of the arc-shaped sliding groove 3332. Compared with the traditional linear sliding surface, not only the sliding of the connecting piece 334 and the sub-swing arm 333 can be realized, but also the relative rotation can be realized. With this structure, when the connecting piece 334 slides relative to the sub-swing arm 333, the inclination angle of the sub-swing arm 333 can be limited by the abutting limitation of the connecting piece 334, so as to limit the rotation amplitude of the sub-swing arm 333, for example, to be less than 90°. Since the lower part of the arc-shaped sliding groove 3332 (the bottom end of the arc-shaped sliding groove 3332 in Figure 18 is folded relative to the side facing the sub-swing arm 333 in Figure 18 , compared with the traditional linear shape, it is beneficial to increase the thickness of the sub-swing arm 333 (the interval in the left-right direction in Figure 18 ), the increase of the strength is beneficial to increase the selection space of the installed display screen, and the anti-falling ability of the whole hinge can be enhanced.

[0114] In summary, the rotating shaft assembly provided by the embodiments of the present application is more inclined to integrated design, and can maintain the overall strength of the rotating shaft assembly in the case of overall lightness and thinness, thereby improving the overall performance of the product and meeting the demand of customers for lightness and thinness and strength reliability.

[0115] It should be noted that in the embodiments of the present application described, the mutual perpendicularity is not absolute perpendicularity, and approximate perpendicularity (for example, the included angle between two structural features is 89.9°) caused by processing errors and assembly errors is also within the range of mutual perpendicularity in the present application. The mutual parallelism in the present application is also not absolute parallelism, and approximate parallelism (for example, the included angle between two structural features is 0.1°) caused by processing errors and assembly errors is also within the range of mutual parallelism in the present application. The axial symmetry in the present application is not absolute axial symmetry, and approximate axial symmetry (for example, part of the structure is offset by a certain distance or angle relative to the symmetry axis) caused by processing errors and assembly errors is also within the range of axial symmetry in the present application. The central symmetry in the present application is not absolute central symmetry, and approximate central symmetry (for example, part of the structure is offset by a certain distance or angle relative to the symmetry axis) caused by processing errors and assembly errors is also within the range of central symmetry in the present application. The present application does not specifically limit this.

[0116] It should be noted that in the present application, similar reference numbers and letters represent 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 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" and the like indicate the orientation or positional relationship 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, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0118] In the description of the present application, it should be noted that unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0119] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A hinge assembly applied to a foldable electronic device, characterized in that, The application relates to a rotating shaft assembly of a foldable device. The rotating shaft support is integrally formed and extends from a first end of the foldable device to a second end of the foldable device in a first direction, and a middle portion of the rotating shaft support has a first interval section for a flexible circuit board to pass through. At least four groups of main swing arms are arranged on both sides of the rotating shaft support, and each group of main swing arms comprises two main swing arms arranged symmetrically on both sides of the rotating shaft support and rotatably connected to the rotating shaft support.

2. The hinge assembly of claim 1, wherein The rotating shaft support comprises: a support body in the shape of a long strip extending in the first direction, and the length of the support body in the first direction is equal to the length of the rotating shaft support in the first direction; a support part arranged symmetrically on the support body, and a sliding groove is arranged at a mounting position of the support part corresponding to the main swing arm, and a first arc-shaped sliding surface of the sliding groove matches a second arc-shaped sliding surface of the main swing arm; the mounting 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 sliding grooves are arranged on the left section, the middle section and the right section respectively.

3. The hinge assembly of claim 2, wherein, The sliding grooves of the left section and the right section are arranged on a lower surface of the support part, the sliding groove of the middle section is arranged on an upper surface of the support part, and the sliding grooves on the left section, the middle section and the right section are coaxial.

4. The hinge assembly of claim 2, wherein, The sliding grooves of the left section and the right section are arranged on an upper surface of the support part, the sliding groove of the middle section is arranged on a lower surface of the support part, and the sliding grooves on the left section, the middle section and the right section are coaxial.

5. The hinge assembly of any one of claims 1-4, wherein, Further comprising: a plurality of damping assemblies arranged on interval sections of the rotating shaft support except the first interval section; the damping assembly comprises: a spring mechanism mounted on the rotating shaft support, and a first rotating shaft of the spring mechanism is arranged in the first direction; a gear mechanism mounted on the rotating shaft support, and a second rotating shaft of the gear mechanism is arranged in the first direction, and the first rotating shaft and the second rotating shaft are different shafts; two auxiliary swing arms arranged symmetrically on the rotating shaft support and rotatably connected to the rotating shaft support, and a first side of the auxiliary swing arm is engaged with a gear of the gear mechanism, and the other side is abutted with a convex wheel and a concave wheel of the spring mechanism, and when the auxiliary swing arm rotates, the compression force of the spring of the spring mechanism is increased or decreased.

6. The rotating shaft assembly according to claim 5, wherein one side of the auxiliary swing arm is provided with a convex-concave wheel; one side of the spring mechanism is provided with a concave-convex wheel corresponding to the convex-concave wheel, and the convex-concave wheel and the concave-convex wheel rotate around the first rotating shaft; when the convex-concave wheel and the concave-convex wheel rotate around the first rotating shaft to the engaged state, the convex part on the convex-concave wheel corresponds to the concave part of the concave-convex wheel, and the concave part on the convex-concave wheel corresponds to the convex part of the concave-convex wheel.

7. The hinge assembly of claim 6, wherein, The first gear is arranged on the auxiliary swing arm, the gear mechanism comprises a second gear, the first gear is engaged with the second gear, and the first gear and the second gear drive the auxiliary swing arms on both sides of the rotating shaft support to rotate synchronously.

8. The hinge assembly of claim 7, wherein, The second gear comprises at least two second gears, and the at least two second gears are engaged with each other.

9. The hinge assembly of any one of claims 1-3, wherein, Further comprising: The connecting piece is rotatably connected with the at least two main swing arms and the at least one auxiliary swing arm.

10. The hinge assembly of claim 9, wherein, The two main swing arms rotatably connected with the connecting piece are respectively arranged at two ends of the connecting piece.

11. The hinge assembly of claim 9, wherein, Further comprising: The door plate is arranged on the main swing arm, the auxiliary swing arm and the connecting piece, and is connected with the main swing arm, the auxiliary swing arm and the connecting piece respectively. The door plate comprises: The door plate body is rotatably connected with the connecting piece. The sliding groove is arranged on the door plate, and an arc surface is formed on a surface of the sliding groove, which is used for assisting the door plate body in rotating along a track of the arc surface relative to the connecting piece.

12. The rotating shaft assembly according to claim 11, wherein A first lap joint surface is arranged on a side of the door plate opposite to the auxiliary swing arm. A second lap joint surface is arranged on a side of the auxiliary swing arm opposite to the door plate. When the auxiliary swing arm drives the door plate to be in a folded state and the door plate moves towards the auxiliary swing arm, the first lap joint surface abuts against the second lap joint surface, and when the door plate returns to a position before the movement, a gap is formed between the first lap joint surface and the second lap joint surface.

13. The hinge assembly of claim 12, wherein, The first lap joint surface is provided with a plurality of first lap joint surfaces, and the second lap joint surface is provided with a plurality of second lap joint surfaces, and the plurality of first lap joint surfaces correspond to the plurality of second lap joint surfaces one by one.

14. The hinge assembly of claim 2, wherein, Two sides of an end of the middle section close to the support body are provided with unfolding stop blocks, the unfolding stop blocks abut against first abutment surfaces of the main swing arm when the main swing arm is in an unfolded state, so as to limit an unfolding angle of the main swing arm.

15. The pivot assembly of claim 2, wherein, Opposite sides of the left side section and the right side section are respectively provided with folding stop blocks, the folding stop blocks abut against second abutment surfaces of the main swing arm when the main swing arm is in a folded state, so as to limit a folding angle of the main swing arm.

16. The hinge assembly of claim 11, wherein, An arc-shaped sliding groove is arranged at a position of the auxiliary swing arm overlapping with the connecting piece, an end of the connecting piece abuts against a side wall of the arc-shaped sliding groove when the auxiliary swing arm is in a folded state, and the end of the connecting piece slides along an arc surface of the arc-shaped sliding groove when the auxiliary swing arm drives the connecting piece to rotate.

17. The hinge assembly of claim 1, wherein, The main swing arm is provided with six groups.

18. The hinge assembly of claim 5, wherein, The damping assembly is provided with four groups.

19. A foldable electronic device, characterized by Comprising: The first shell and the second shell are rotatably connected through the rotating shaft assembly, and the rotating shaft assembly is the rotating shaft assembly according to any one of claims 1-18.

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