Rotating shaft mechanism and foldable electronic device

Abstract

Provided in the embodiments of the present application are a rotating shaft mechanism and a foldable electronic device. The rotating shaft mechanism is applied to the foldable electronic device. The rotating shaft mechanism comprises a middle beam, a plurality of main swing arms, and two screen supporting door plates respectively provided on two sides of the middle beam; at least one main swing arm is arranged between the middle beam and any screen supporting door plate; each main swing arm comprises a main body part, a first connecting part and a second connecting part, the first connecting part and the second connecting part extending out of two ends of the main body part, being symmetrically arranged and forming an integrated structure with the main body part, the main body part of the main swing arm being mounted on the middle beam and being rotationally connected to the middle beam, and the first connecting part and the second connecting part being rotationally connected to a same screen supporting door plate; the plurality of main swing arms drive the two screen supporting door plates to rotate toward each other or rotate away from each other about the middle beam, such that the rotating shaft mechanism is in a folded state or an unfolded state. In the rotating shaft mechanism of the present application, the first connecting part and the second connecting part of each main swing arm are rotationally connected to a same screen supporting door plate, thus better balancing the stress on the rotating shaft mechanism.

Description

Rotating shaft mechanism and foldable electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 2, 2023, with application number 202310651448.9 and invention name “A hinge mechanism and a foldable electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electronic products, and in particular to a hinge mechanism and a foldable electronic device. Background Art

[0003] Foldable electronic devices such as foldable screen mobile phones are becoming more and more popular among consumers. The folding and flattening of foldable electronic devices are usually achieved through a hinge mechanism.

[0004] The foldable electronic device in the related art includes a hinge mechanism and a middle frame arranged on both sides of the hinge mechanism. The two middle frames are fixedly connected to the hinge mechanism. The flexible screen covers the two middle frames and the hinge mechanism. The hinge mechanism drives the flexible screen to realize the folding of the foldable electronic device. Among them, the hinge mechanism mainly includes: a middle beam, screen-supporting door panels arranged on both sides of the middle beam, and a plurality of main swing arms. The number of screen-supporting door panels is 4, which are evenly arranged on both sides of the middle beam. Each main swing arm is dispersed and fixed on the two screen-supporting door panels close to the middle beam, located between the middle beam and the screen-supporting door panel away from the middle beam and rotatably connected to the two. The two screen-supporting door panels away from the middle beam are used to connect with the middle frames on both sides.

[0005] In the related art, the solution of using multiple main swing arms and four screen-supporting door panels has problems such as a large number of parts and uneven force on the rotating shaft mechanism.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a hinge mechanism and a foldable electronic device to make the force on the hinge mechanism more balanced while reducing the number of parts. The specific technical solution is as follows:

[0008] An embodiment of the first aspect of the present application proposes a pivot mechanism, which is applied to a foldable electronic device; the pivot mechanism includes a center beam, multiple main swing arms and two screen-supporting door panels respectively arranged on both sides of the center beam; at least one main swing arm is arranged between the center beam and any of the screen-supporting door panels; each of the main swing arms includes a main body, a first connecting part and a second connecting part; the first connecting part and the second connecting part extend out of both ends of the main body and are symmetrically arranged, and form an integrated structure with the main body; the main body of the main swing arm is installed on the center beam and is rotatably connected to the center beam; the first connecting part and the second connecting part of the main swing arm are rotatably connected to the same screen-supporting door panel; the multiple main swing arms drive the two screen-supporting door panels to rotate toward or away from each other around the center beam, so that the pivot mechanism is in a folded state or a flattened state.

[0009] The hinge mechanism of the present application is applied to a foldable electronic device. Compared with the solution in the related art that uses four screen-supporting door panels and the main swing arm is dispersedly fixed on two screen-supporting door panels close to the center beam, the first connection part and the second connection part of the main swing arm in the hinge mechanism of the present application are formed by extending from the main body, which is an integrated structure to form an integrated double-rotation main swing arm. The first connection part and the second connection part are rotatably connected to the same screen-supporting door panel. The first connection part and the second connection part are symmetrically arranged, which can make the force on the hinge mechanism more balanced. In addition, the number of screen-supporting door panels of the hinge mechanism in the present application is two, and the number of parts is smaller.

[0010] In some embodiments of the present application, the main body of the main swing arm includes a first middle part and a first protrusion and a second protrusion respectively formed at both ends of the first middle part; the first protrusion and the second protrusion are symmetrically arranged relative to the first middle part; the first connection part of the main swing arm is formed on the first protrusion, and the second connection part of the main swing arm is formed on the second protrusion; a first slide groove is provided on the middle beam, and the main body of the main swing arm is installed in the first slide groove; during the switching of the rotating shaft mechanism between the flattened state and the folded state, the first middle part, the first protrusion and the second protrusion slide along the first slide groove to make the main swing arm rotate around the middle beam.

[0011] As can be seen from the above, the first middle part connects the first protrusion and the second protrusion, the first connection part is formed on the first protrusion, and the second connection part is formed on the second protrusion to form an integrated structure. The first middle part, the first protrusion and the second protrusion can slide in the first sliding groove of the center beam, thereby realizing the rotation of the main swing arm around the center beam, and then realizing the rotation of the rotating shaft mechanism.

[0012] In some embodiments of the present application, the main body of the main swing arm has a first upper mating surface and a first lower mating surface; the top surface of the first middle portion is formed as the first upper mating surface, and the bottom surfaces of the first protrusion and the second protrusion are respectively formed as a first lower mating surface; the first upper mating surface and the first lower mating surface are both arc surfaces; the shape of the top surface of the first slide groove of the center beam is adapted to the shape of the first upper mating surface, and the shape of the bottom surface of the first slide groove of the center beam is adapted to the shape of the first lower mating surface; during the switching of the rotating shaft mechanism between the flattened state and the folded state, the first upper mating surface slides along the top surface of the first slide groove, and the first lower mating surface slides along the bottom surface of the first slide groove.

[0013] As can be seen from the above, the first upper mating surface is located between the two first lower mating surfaces, forming a distributed mating surface in which the mating surfaces are not superimposed in the thickness direction of the rotating shaft mechanism. Correspondingly, the first slide groove is formed as a distributed slide groove, which is beneficial to reducing the thickness of the middle beam in the thickness direction of the rotating shaft mechanism. At the same time, it is beneficial to the design of the wall thickness of the first slide groove, thereby ensuring the strength of the middle beam.

[0014] In some embodiments of the present application, in the extension direction of the middle beam, the two ends of the first slide groove are respectively formed as two give way grooves, and the give way grooves are arranged corresponding to the first protrusions of the screen door panel; when the rotating shaft mechanism is in a folded state, the first protrusion is located in the give way groove; a spacer is formed between the two give way grooves, and the first middle part of the main swing arm is arranged in the spacer; the middle beam has a second protrusion formed above the spacer, and the second protrusion covers the spacer; the bottom surface of the second protrusion forms the top surface of the first slide groove; a third protrusion is respectively formed between the two give way grooves and the spacer, and the top surface of the third protrusion forms the bottom surface of the first slide groove.

[0015] As can be seen above, the clearance groove on the center beam provides space for the first protrusion on the screen door panel, ensuring that the center beam and screen door panel do not interfere with each other during the folding process of the hinge mechanism. The provision of the spacer not only helps to reduce the weight of the hinge mechanism, but also, by locating the first intermediate portion of the main swing arm within the spacer, the main swing arm can be quickly positioned for easy installation.

[0016] In some embodiments of the present application, an anti-dropout buckle is also provided on the center beam; an anti-dropout groove is provided on the top of the first middle part of the main swing arm, and the anti-dropout groove has a first anti-dropout position close to the center beam in a flattened state and a second anti-dropout position away from the center beam; when the rotating shaft mechanism is in a flattened state, the anti-dropout buckle is located at the first anti-dropout position and is clamped with the anti-dropout groove; when the rotating shaft mechanism is in a folded state, the anti-dropout buckle is located at the second anti-dropout position and is clamped with the anti-dropout groove.

[0017] From the above, it can be seen that the cooperation of the anti-drop buckle and the anti-drop groove can limit the rotation of the main swing arm, preventing the rotating shaft mechanism from rotating at too large an angle during the rotation process, causing damage to the flexible screen.

[0018] In some embodiments of the present application, a first arc segment is provided on the first connection part of the main swing arm, and a second arc segment is provided on the second connection part of the main swing arm; a second slide groove adapted to the shape of the first arc segment is provided on the screen-supporting door panel at a position corresponding to the first connection part of the main swing arm, and a third slide groove adapted to the shape of the second arc segment is provided at a position corresponding to the second connection part of the main swing arm; during the switching of the rotating shaft mechanism between the flattened state and the folded state, the first arc segment slides along the second slide groove, and the second arc segment slides along the third slide groove, so that the screen-supporting door panel and the main swing arm rotate relative to each other.

[0019] As can be seen from the above, the first arc segment and the second arc segment of the main swing arm are respectively arranged in the second slide groove and the third slide groove of the screen-supporting door panel, and the arc surface of the main swing arm cooperates with the arc surface on the screen-supporting door panel to realize the relative rotation between the screen-supporting door panel and the main swing arm, and the structure is simple.

[0020] In some embodiments of the present application, a first limiting protrusion is provided on the first connecting portion of the main swing arm, and a second limiting protrusion corresponding to the first limiting protrusion is provided inside the second slide groove; a third limiting protrusion is provided on the second connecting portion, and a fourth limiting protrusion corresponding to the second limiting protrusion is provided inside the third slide groove; when the rotating shaft mechanism is in a flattened state, the first limiting protrusion is abutted against the second limiting protrusion inside the second slide groove, and the third limiting protrusion is abutted against the fourth limiting protrusion inside the third slide groove to limit the main swing arm from continuing to rotate; when the rotating shaft mechanism is in a folded state, the first arc segment abuts against the end of the second slide groove, and the second arc segment abuts against the end of the third slide groove to limit the main swing arm from continuing to rotate.

[0021] From the above, it can be seen that by setting a limit protrusion to limit the rotation of the main swing arm, and cooperating with the anti-slip buckle and anti-slip groove, the reliability of the limit can be ensured, and the damage to the flexible screen caused by the main swing arm driving the screen-supporting door panel to rotate too large an angle can be further prevented.

[0022] In some embodiments of the present application, the main swing arm is an axisymmetric part, and the axis of symmetry of the main swing arm is perpendicular to the extension direction of the center beam; the first connecting member and the second connecting member are symmetrically arranged relative to the axis of symmetry of the main swing arm, and the first arc segment and the second arc segment are symmetrically arranged relative to the axis of symmetry of the main swing arm.

[0023] From the above, it can be seen that the forces on both sides of the symmetry axis of the axisymmetric parts are more balanced, which can make the forces on the central beam and screen door panels connected to them more balanced. At the same time, compared with non-axisymmetric parts, axisymmetric parts are easier to process.

[0024] In some embodiments of the present application, at least one auxiliary swing arm is further provided between the center beam and any of the screen-supporting door panels; the first end of the auxiliary swing arm is rotatably connected to the center beam, and the second end of the auxiliary swing arm is slidably connected to the screen-supporting door panel; during the switching of the rotating shaft mechanism between the folded state and the flattened state, the first end of the auxiliary swing arm rotates relative to the center beam, and the second end of the auxiliary swing arm slides relative to the screen-supporting door panel.

[0025] As can be seen from the above, the auxiliary swing arm is arranged between the center beam and the screen door panel to assist the main swing arm to jointly complete the folding or flattening of the rotating shaft mechanism, which can make the folding mechanism more synchronized.

[0026] In some embodiments of the present application, the auxiliary swing arm includes a rotating part formed at the first end of the auxiliary swing arm and a sliding connection part formed at the second end of the auxiliary swing arm; when the rotating shaft mechanism is in a flattened state, the rotating part is embedded in a fourth slide groove provided on the middle beam; when the rotating shaft mechanism is in a folded state, the rotating part is in a vertical state, and its end portion remains in the fourth slide groove; the sliding connection part includes two sliders fixedly connected to the rotating part; two fifth slide grooves corresponding to the two sliders are formed on the screen door panel; during the switching of the rotating shaft mechanism between the flattened state and the folded state, the slider slides along the fifth slide groove.

[0027] As can be seen from the above, the rotating part of the auxiliary swing arm is arranged in the fourth sliding groove of the middle beam, and the two cooperate to realize the rotational connection between the auxiliary swing arm and the middle beam; the slider on the sliding connection part of the auxiliary swing arm is arranged in the fifth sliding groove of the supporting screen door panel, and the two cooperate to realize the sliding of the auxiliary swing arm and the supporting screen door panel, and the structure is simple.

[0028] In some embodiments of the present application, in the extension direction of the center beam, the rotating part includes a second middle part and two recessed arc-shaped parts respectively formed on both sides of the second middle part; the fourth sliding groove is provided with a convex structure adapted to the shape of the recessed arc-shaped part at a position corresponding to the two recessed arc-shaped parts; the concave surface of the two recessed arc-shaped parts matching the convex structure forms the second upper mating surface of the rotating part; the bottom surface of the second middle part forms the second lower mating surface of the rotating part; the shape of the bottom surface of the second middle part is adapted to the shape of the bottom surface of the fourth sliding groove.

[0029] As can be seen from the above, the raised structure is located at the top of the recessed arc-shaped portion, the bottom surface of the raised structure cooperates with the arc-shaped top surface of the recessed arc-shaped portion, and the second lower mating surface is located between the two second upper mating surfaces, forming a distributed mating surface in which the mating surfaces are not superimposed in the thickness direction of the rotating shaft mechanism. Correspondingly, the fourth slide groove is formed as a distributed slide groove, which is beneficial to reducing the thickness of the middle beam in the thickness direction of the rotating shaft mechanism. At the same time, it is beneficial to the design of the wall thickness of the fourth slide groove, thereby ensuring the strength of the middle beam.

[0030] In some embodiments of the present application, two concave structures are formed on both sides of the protruding structure in a direction perpendicular to the extension direction of the center beam; when the rotating shaft structure is in a flattened state, the concave arc-shaped portion is respectively embedded in the two concave structures along both ends of the direction perpendicular to the extension direction of the center beam; when the rotating shaft structure is in a folded state, one end of the concave arc-shaped portion is located below the protruding structure, and the other end of the concave arc-shaped portion is located above the protruding structure;

[0031] During the switching process of the rotating shaft mechanism between the flattened state and the folded state, one end of the concave arc-shaped portion slides in the fourth sliding groove; and the other end of the concave arc-shaped portion slides out of the fourth sliding groove.

[0032] As can be seen from the above, the recessed structure provides an accommodating space for the end of the recessed arc portion. Through the cooperation of the recessed arc portion, the recessed structure and the convex structure, the switching of the auxiliary swing arm between the horizontal state and the vertical state is realized. During this process, the convex structure can prevent the auxiliary swing arm from falling out of the fourth slide groove, and a part of the structure of the rotating part of the auxiliary swing arm is always located in the fourth slide groove.

[0033] In some embodiments of the present application, a first arc-shaped protrusion is formed on the bottom surface of the second middle portion; a first arc-shaped groove corresponding to the first arc-shaped protrusion is formed on the bottom of the fourth slide groove, and the first arc-shaped protrusion is arranged in the first arc-shaped groove; in the extension direction of the middle beam, the bottom surface of the second middle portion located on both sides of the first arc-shaped protrusion is formed as the second lower mating surface; in the extension direction of the middle beam, two second arc-shaped protrusions are formed on both sides of the first arc-shaped groove; in the process of switching the rotating shaft mechanism between the flattened state and the folded state, the second lower mating surface of the second middle portion slides along the top surfaces of the two second arc-shaped protrusions.

[0034] As can be seen from the above, the first arc-shaped protrusion is arranged in the first arc-shaped groove, which can play a role in positioning the auxiliary swing arm in the fourth sliding groove.

[0035] In some embodiments of the present application, the rotating shaft mechanism also includes an anti-slip block; the anti-slip block is fixedly connected to the second middle part of the auxiliary swing arm, and the anti-slip block is arranged in the first arc-shaped groove; during the switching of the rotating shaft mechanism between the flattened state and the folded state, the anti-slip block rotates in the first arc-shaped groove; a fifth limiting protrusion is provided inside the first arc-shaped groove; when the rotating shaft mechanism is in the folded state, the anti-slip block is clamped with the fifth limiting protrusion to limit the auxiliary swing arm from continuing to rotate.

[0036] As can be seen from the above, the anti-slip block and the fifth limiting protrusion in the first arc-shaped groove cooperate to limit the rotation of the auxiliary swing arm, thereby further limiting the rotation of the rotating shaft mechanism, which is beneficial to prevent damage to the flexible screen caused by excessive rotation angle of the screen-supporting door panel.

[0037] In some embodiments of the present application, the auxiliary swing arm is an axisymmetric part, and the axis of symmetry of the auxiliary swing arm is perpendicular to the extension direction of the center beam; the two concave arc portions are symmetrically arranged along the axis of symmetry of the auxiliary swing arm, and the two sliding portions are symmetrically arranged along the axis of symmetry of the auxiliary swing arm.

[0038] From the above, it can be seen that the forces on both sides of the symmetry axis of the axisymmetric parts are more balanced, which can make the forces on the central beam and screen door panels connected to them more balanced. At the same time, compared with non-axisymmetric parts, axisymmetric parts are easier to process.

[0039] In some embodiments of the present application, the slider is a strip-shaped protrusion; the fifth sliding groove is a strip-shaped groove, and the strip-shaped protrusion is inserted into the strip-shaped groove.

[0040] As can be seen from the above, the arrangement in which the strip-shaped protrusion is directly inserted into the strip-shaped groove has the characteristic of simple structure.

[0041] In some embodiments of the present application, the rotating shaft mechanism further includes a damping structure; the second end of the auxiliary swing arm is provided with a hollow area for accommodating the damping structure; the damping structure includes a cam, an elastic member and a push frame; the middle beam is provided with a third protrusion for abutting against the cam, and the third protrusion is located in the hollow area of ​​the auxiliary swing arm; the cam is rotatably connected to the first end of the push frame; the elastic member is arranged between the second end of the push frame and the side wall of the hollow area of ​​the auxiliary swing arm; the second end of the push frame is slidably connected to the second end of the auxiliary swing arm; the outer surface of the cam is arranged in contact with the bottom surface of the third protrusion; The bottom surface of the third protrusion is an arc-shaped surface; a positioning groove is provided on the bottom surface of the third protrusion; when the rotating shaft structure is in a flattened state, the cam is located in the positioning groove; when the rotating shaft structure is in a folded state, the cam is disengaged from the third protrusion and is located on the top of the third protrusion, and the elastic member is in a released state; during the process of the rotating shaft mechanism changing from the flattened state to the folded state, the cam slides out of the positioning groove and rolls along the bottom surface of the third protrusion, so that the elastic member is compressed by the push frame and the auxiliary swing arm; when the cam is disengaged from the bottom surface of the third protrusion, the elastic member is released.

[0042] As can be seen from the above, the damping structure has an elastic part. When the rotating shaft mechanism switches between the flat state and the folded state, the elastic part is first compressed and then released, which can play a shock-absorbing role and make the rotation of the rotating shaft mechanism smoother.

[0043] In some embodiments of the present application, the damping structure also includes a hollow cover plate and a connecting shaft; the first ends of the cam and the pushing frame are respectively provided with connecting holes, and the connecting shaft is passed through the connecting hole of the cam and the connecting hole of the pushing frame; a slide rail is provided on the second end of the auxiliary swing arm, and the hollow cover plate covers the slide rail setting and exposes the elastic member; the hollow cover plate is fixedly connected to the auxiliary swing arm; the second end of the pushing frame is slidably set in the slide rail and is located between the hollow cover plate and the slide rail; a first connecting column is provided on the second end of the pushing frame, and a second connecting column corresponding to the first connecting column is provided on the side wall of the hollow area of ​​the auxiliary swing arm; the elastic member is a spring, and the two ends of the spring are respectively sleeved on the first connecting column and the second connecting column.

[0044] As can be seen from the above, the hollow design of the hollow cover plate, while achieving the limitation of the push frame, is beneficial to reducing the weight of the middle beam of the rotating shaft mechanism on the one hand, and provides a larger installation space for the elastic member on the other hand.

[0045] In some embodiments of the present application, the middle beam includes a first sub-beam, a second sub-beam and a third sub-beam connected in sequence; the first sub-beam and the second sub-beam are connected by a synchronization mechanism, and the second sub-beam and the third sub-beam are connected by another synchronization mechanism; the synchronization mechanism includes a first gear, a second gear, a first swing arm and a second swing arm; the first gear is fixedly connected to the first swing arm, and the second gear is fixedly connected to the second swing arm; the first gear and the second gear are engaged with each other; the first swing arm and the second swing arm are fixedly connected to different screen-supporting door panels; the two screen-supporting door panels include a first screen-supporting door panel and a second screen-supporting door panel; the first sub-beam and the third sub-beam are both connected to the first screen-supporting door panel through one main swing arm and one auxiliary swing arm, and are connected to the second screen-supporting door panel through one main swing arm and one auxiliary swing arm; the second sub-beam is respectively connected to the first screen-supporting door panel and the second screen-supporting door panel through two main swing arms.

[0046] As can be seen from the above, different sub-beams are connected through a synchronization mechanism. The two swing arms in the synchronization mechanism are respectively connected to different screen-supporting door panels. The first swing arm drives the first screen-supporting door panel to rotate, and the second swing arm drives the second screen-supporting door panel to rotate, thereby realizing the synchronous folding of the two screen-supporting door panels of the rotating shaft mechanism.

[0047] The implementation of the second aspect of the present application proposes a foldable electronic device, comprising a flexible screen, a hinge mechanism in any embodiment of the first aspect, and two middle frames respectively arranged on both sides of the hinge mechanism; the two middle frames are respectively connected to the two screen-supporting door panels of the hinge mechanism; the flexible screen covers the two middle frames and the hinge mechanism; during the switching of the hinge mechanism between the flattened state and the folded state, the two middle frames are driven by the two screen-supporting door panels to rotate toward each other or away from each other around the hinge mechanism, so that the foldable electronic device is in a folded state or a flattened state.

[0048] The foldable electronic device of the present application includes the hinge mechanism of any of the above-mentioned embodiments. Compared with the solution in the related art that uses 4 screen-supporting door panels and the main swing arm is dispersedly fixed on two screen-supporting door panels close to the center beam, the first connection part and the second connection part of the main swing arm in the hinge mechanism of the foldable electronic device of the present application are formed by extending from the main body, which is an integrated structure to form an integrated double-rotation main swing arm. The first connection part and the second connection part are rotatably connected to the same screen-supporting door panel. The first connection part and the second connection part are symmetrically arranged, which can make the force on the hinge mechanism more balanced. In addition, the number of screen-supporting door panels of the hinge mechanism in the present application is two, and the number of parts is smaller, thereby reducing the number of parts of the foldable electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0050] FIG1a is a top view of a rotating shaft mechanism in the related art;

[0051] FIG1b is a bottom view of a rotating shaft mechanism in the related art;

[0052] FIG2 is a perspective view of a foldable electronic device provided in an embodiment of the present application;

[0053] FIG3 is an exploded schematic diagram of the foldable electronic device shown in FIG2 ;

[0054] FIG4 a is a schematic diagram of the connection structure between the rotating shaft mechanism and the middle frame in a flattened state according to an embodiment of the present application;

[0055] FIG4b is a side view of FIG4a;

[0056] FIG5 a is a perspective view of the hinge mechanism and the middle frame in a folded state provided by an embodiment of the present application;

[0057] FIG5 b is a schematic diagram of the connection structure between the rotating shaft mechanism and the middle frame in a folded state according to an embodiment of the present application;

[0058] Figure 5c is a side view of Figure 5b;

[0059] FIG6 a is a schematic diagram of the connection structure between the rotating shaft mechanism and the middle frame in an intermediate state according to an embodiment of the present application;

[0060] FIG6b is a side view of FIG6a;

[0061] FIG7 a is a top view of the rotating shaft mechanism provided in an embodiment of the present application;

[0062] FIG7b is a bottom view of the rotating shaft mechanism shown in FIG7a;

[0063] FIG7c is a side view of the rotating shaft mechanism shown in FIG7a;

[0064] FIG8 a is a perspective view of a rotating shaft mechanism according to an embodiment of the present application;

[0065] FIG8b is a partial enlarged schematic diagram of FIG8a;

[0066] FIG8c is a schematic diagram of a partially exploded structure of the rotating shaft mechanism shown in FIG8a;

[0067] FIG8d is a partial enlarged schematic diagram of FIG8c;

[0068] FIG9 a is a perspective view of a main swing arm provided in an embodiment of the present application;

[0069] FIG9b is a top view of the main swing arm shown in FIG9a;

[0070] FIG9c is a bottom view of the main swing arm shown in FIG9a;

[0071] FIG9 d is a side view of the main swing arm shown in FIG9 a ;

[0072] FIG10 a is a perspective view of a first sub-beam of a rotating shaft mechanism provided in an embodiment of the present application;

[0073] FIG10 b is a top view of the first sub-beam shown in FIG10 a ;

[0074] FIG10c is a bottom view of the first sub-beam shown in FIG10a;

[0075] FIG11 is a perspective view of a screen-supporting door panel of the rotating shaft mechanism provided in an embodiment of the present application;

[0076] FIG12 is a schematic diagram of the cooperation between the main swing arm, the center beam and the screen-supporting door panel in a flattened state provided by an embodiment of the present application;

[0077] FIG13a is a cross-sectional view taken along AA in FIG12 (the rotating shaft mechanism is in a flattened state);

[0078] FIG13b is a cross-sectional view taken along AA in FIG12 (the rotating shaft mechanism is in a folded state);

[0079] FIG13c is a cross-sectional view taken along AA in FIG12 (the rotating shaft mechanism is in an intermediate state);

[0080] FIG14 is a perspective schematic diagram of a secondary swing arm provided in an embodiment of the present application;

[0081] FIG15 is a schematic diagram of the cooperation between the auxiliary swing arm and the damping structure in a flattened state provided by an embodiment of the present application;

[0082] FIG16a is a cross-sectional view taken along line BB of FIG15 (the rotating shaft mechanism is in a flattened state);

[0083] FIG16 b is a cross-sectional view taken along line BB of FIG15 (the rotating shaft mechanism is in an intermediate state);

[0084] FIG16c is a cross-sectional view taken along line BB of FIG15 (the rotating shaft mechanism is in a folded state);

[0085] FIG17 is a schematic diagram of a damping structure installed in the secondary swing arm according to an embodiment of the present application.

[0086] Explanation of reference numerals: In FIG1a and FIG1b: hinge mechanism 1000; center beam 1001; screen-supporting door panel 1002; main swing arm 1003; damping structure 1004; synchronization mechanism 1005; In FIG2 to FIG17: foldable electronic device 1; hinge mechanism 10; center frame 20; flexible screen 30; center beam 100; 1. The first sub-beam 101; the second sub-beam 102; the third sub-beam 103; the first chute 110; the yield groove 111; the spacer 112; the third protrusion 113; the second protrusion 114; the mounting hole 1141; the mounting beam 1142; the fourth chute 130; the protrusion structure 131; the recessed structure 132; the first arc-shaped groove 133; the fifth limiting protrusion 1331; the second arc-shaped protrusion 134; the third protrusion 140; the positioning groove 141; the main swing arm 200; the first upper mating surface 201; the first lower mating surface 202; the main body 210; the first middle portion 211; the anti-slip groove 2111; the first anti-slip position 211a; the second anti-slip position 211b; the first protrusion 212; the second protrusion 213; the first connecting portion 220; the first arc-shaped segment 221; the first limiting protrusion 222; the second connecting portion 230; Second arc segment 231; third limiting protrusion 232; screen door panel 300; first screen door panel 301; second screen door panel 302; first protrusion 310; second slide groove 320; third slide groove 330; fifth slide groove 340; auxiliary swing arm 400; second upper mating surface 401; hollow area 403; slide rail 404; second connecting column 405; rotating portion 410; second intermediate portion 411; first arc protrusion Lift 4111; recessed arc-shaped portion 412; sliding connection portion 420; slider 421; anti-drop buckle 500; anti-drop block 600; damping structure 700; cam 710; elastic member 720; push frame 730; first connecting column 731; hollow cover plate 740; connecting shaft 750; synchronization mechanism 800; first gear 810; second gear 820; first swing arm 830; second swing arm 840; screw 900. DETAILED DESCRIPTION

[0087] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below with reference to the accompanying drawings and examples. It should be understood that the described examples are only some examples of the present invention, not all examples. All other examples derived by persons of ordinary skill in the art based on the examples of the present invention fall within the scope of protection of the present invention.

[0088] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0089] To facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. For example, the first connecting portion and the second connecting portion are used to distinguish different connecting portions and do not limit their order. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or position, and the words "first" and "second" do not necessarily mean that they are different.

[0090] It should be noted that, in this application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplarily" or "for example" is intended to present the relevant concepts in a concrete manner.

[0091] Figures 1a and 1b illustrate the structure of a pivot mechanism 1000 in the related art. The pivot mechanism 1000 comprises a center beam 1001, screen-supporting panels 1002 disposed on either side of the beam, multiple main swing arms 1003, a damping structure 1004, and a synchronization mechanism 1005. Four screen-supporting panels 1002 are evenly spaced on either side of the beam. Each main swing arm 1003 is fixed to the two screen-supporting panels 1002 closest to the beam, positioned between the beam and the screen-supporting panel 1002 further away from the beam, and rotationally connected to both panels. The damping structure 1004 is mounted on the screen-supporting panels 1002, and the synchronization mechanism 1005 is mounted on the beam. The synchronization mechanism 1005 is connected at each end to the two screen-supporting panels 1002 further away from the beam. In the related art, the solution of using multiple main swing arms 1003 and four supporting screen door panels 1002 has problems such as a large number of parts and uneven force on the rotating shaft mechanism 1000.

[0092] The foldable electronic device provided in the embodiments of the present application can be a mobile phone, a tablet computer, a wearable device, an in-vehicle device, an augmented reality (AR) / virtual reality (VR) device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), or other foldable mobile terminal products with a flexible screen. The embodiments of the present application do not limit the specific type of the foldable electronic device.

[0093] Referring to Figures 2 and 3 , in the embodiment of the present application, a foldable electronic device 1 includes a hinge mechanism 10, two middle frames 20, and a flexible screen 30. The two middle frames 20 of the foldable electronic device 1 are connected by the hinge mechanism 10, which enables the two middle frames 20 to rotate relative to each other, thereby achieving the folding and unfolding of the foldable electronic device 1. The structures of the two middle frames 20 can be identical or different. The specific structure of the two middle frames 20 can be determined according to the specific product and is not specifically limited herein.

[0094] The flexible screen 30 includes two fixed portions and a curved portion. The two fixed portions can be fixedly coupled to the two middle frames 20. The curved portion is disposed opposite the main shaft of the hinge mechanism 10, and the two are not fixed to each other, so that the curved portion can bend and deform when folded. When the foldable electronic device 1 is in the folded state, the curved portion can bend into an arc shape. This ensures that the screen's inward folding radius is large enough to withstand significant bending, while the fixed portions on both sides can fit together well, leaving no gaps and minimizing bending marks.

[0095] The flexible screen 30 includes a display module and a transparent cover. The display module can display images and videos, etc. The display module can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active matrix organic light-emitting diode or an active matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oLed, a quantum dot light-emitting diode (QLED), etc. The transparent cover covers the outside of the display module to protect the display module. The transparent cover can be a glass cover, or of course it can be other transparent materials that can play a protective role. The flexible screen 30 can also have a touch function, that is, the flexible screen 30 can be a touch screen.

[0096] In the embodiment of the present application, the two middle frames 20 can rotate toward each other or away from each other under the drive of the hinge mechanism 10, so that the foldable electronic device 1 is in a folded state or a flattened state. Specifically, as shown in Figures 4a and 4b, when the hinge mechanism 10 is in the flattened state, the two middle frames 20 on both sides of the hinge mechanism 10 are also in the flattened state, so that the foldable electronic device 1 is in the flattened state; as shown in Figures 5a to 5c, when the hinge mechanism 10 is in the folded state, the two middle frames 20 on both sides of the hinge mechanism 10 are also in the folded state, that is, the two middle frames 20 on both sides of the hinge mechanism 10 overlap, so that the foldable electronic device 1 is in the folded state; as shown in Figures 6a and 6b, when the hinge mechanism 10 is in the intermediate state, the two middle frames 20 on both sides of the hinge mechanism 10 present a certain angle, so that the foldable electronic device 1 is in the intermediate state.

[0097] Based on the positional relationship between the hinge mechanism 10 and the flexible screen 30, electronic devices can be divided into outward-folding electronic devices and inward-folding electronic devices. Outward-folding electronic devices refer to electronic devices in which the flexible screen 30 is wrapped around the outside of the hinge mechanism 10 when the device is folded; inward-folding electronic devices refer to electronic devices in which the hinge mechanism 10 is wrapped around the outside of the flexible screen 30 when the device is folded. The hinge mechanism 10 of the present application is particularly suitable for outward-folding electronic devices.

[0098] As shown in FIG7a, FIG7a is a top view of the hinge mechanism 10 provided in an embodiment of the present application, in which the hinge mechanism 10 is in a flattened state. The embodiment of the present application proposes a hinge mechanism 10, which is applied to a foldable electronic device 1; the hinge mechanism 10 includes a center beam 100, a plurality of main swing arms 200, and two screen-supporting door panels 300 respectively arranged on both sides of the center beam 100; at least one main swing arm 200 is arranged between the center beam 100 and any of the screen-supporting door panels 300; each main swing arm 200 includes a main body portion 210, a first connecting portion 220, and a second connecting portion 230; the first connecting portion 220 and the second connecting portion 230 extend out from both ends of the main body portion 210 and are symmetrically arranged, and form an integrated structure with the main body portion 210; the main body portion 210 of the main swing arm 200 is installed on the central beam 100 and is rotatably connected to the central beam 100; the first connecting portion 220 and the second connecting portion 230 of the main swing arm 200 are rotatably connected to the same supporting screen door panel 300; multiple main swing arms 200 drive two supporting screen door panels 300 to rotate toward each other or back to back around the central beam 100, so that the rotating shaft mechanism 10 is in a folded state or a flattened state.

[0099] In order to more clearly illustrate the structure of the rotating shaft mechanism 10 of the embodiment of the present application, structural diagrams of the rotating shaft mechanism 10 from multiple perspectives are provided. Figure 7a is a top view of the rotating shaft mechanism 10 provided in the embodiment of the present application; Figure 7b is a bottom view of the rotating shaft mechanism 10 shown in Figure 7a; and Figure 7c is a side view of the rotating shaft mechanism 10 shown in Figure 7a.

[0100] The hinge mechanism 10 of the present application is applied to a foldable electronic device 1. Compared with the solution in the related art that uses four screen-supporting door panels and the main swing arm is dispersedly fixed on two screen-supporting door panels close to the center beam, the first connection part 220 and the second connection part 230 of the main swing arm 200 in the hinge mechanism 10 of the present application are formed by extending from the main body 210, which is an integrated structure to form an integrated double-rotation main swing arm. The first connection part 220 and the second connection part 230 are rotatably connected to the same screen-supporting door panel 300. The first connection part 220 and the second connection part 230 are symmetrically arranged, which can make the force on the hinge mechanism 10 more balanced, and the number of screen-supporting door panels 300 of the hinge mechanism 10 of the present application is two, and the number of parts is smaller.

[0101] As shown in Figures 7a to 7c, in some embodiments of the present application, at least one auxiliary swing arm 400 is further provided between the center beam 100 and any of the screen door panels 300. The center beam 100 includes a first sub-beam 101, a second sub-beam 102, and a third sub-beam 103, which are connected in sequence. The first sub-beam 101 and the second sub-beam 102 are fixedly connected by fasteners. A synchronization mechanism 800 is provided between the first sub-beam 101 and the second sub-beam 102. The second sub-beam 102 and the third sub-beam 103 are fixedly connected by fasteners. Another synchronization mechanism 800 is provided between the second sub-beam 102 and the third sub-beam 103. The two screen-supporting door panels 300 include a first screen-supporting door panel 301 and a second screen-supporting door panel 302. The first sub-beam 101 is connected to the first screen-supporting door panel 301 through a main swing arm 200 and a secondary swing arm 400, and the first sub-beam 101 is connected to the second screen-supporting door panel 302 through a main swing arm 200 and a secondary swing arm 400; the third sub-beam 103 is connected to the first screen-supporting door panel 301 through a main swing arm 200 and a secondary swing arm 400, and the third sub-beam 103 is connected to the second screen-supporting door panel 302 through a main swing arm 200 and a secondary swing arm 400; the second sub-beam 102 is connected to the first screen-supporting door panel 301 through a main swing arm 200; and the second sub-beam 102 is connected to the second screen-supporting door panel 302 through a main swing arm 200.

[0102] As shown in FIG. 7 a to FIG. 7 c , a damping structure 700 may be further provided on one side of the secondary swing arm 400 .

[0103] Specifically, as shown in Figures 8a to 8d, Figure 8a is a three-dimensional view of the rotating shaft mechanism 10 according to an embodiment of the present application, Figure 8b is a partially enlarged schematic diagram of Figure 8a, Figure 8c is a partially exploded structural schematic diagram of the rotating shaft mechanism 10 shown in Figure 8a, and Figure 8d is a partially enlarged schematic diagram of Figure 8c. Figure 8c shows a screen-supporting door panel 300, a center beam 100, a main swing arm 200, a secondary swing arm 400, a damping structure 700, and a synchronization mechanism 800. A first protrusion 310 is provided on the screen-supporting door panel 300. The first protrusion 310 can be fixed by screws 900, or it can be an integrally formed structure on the screen-supporting door panel 300.

[0104] In some embodiments of the present application, as shown in Figures 9a to 9d, they are schematic structural diagrams of the main swing arm 200 in Figure 8b at different viewing angles, Figure 9a is a three-dimensional diagram of the main swing arm 200 provided in an embodiment of the present application; Figure 9b is a top view of the main swing arm 200 shown in Figure 9a; Figure 9c is a bottom view of the main swing arm 200 shown in Figure 9a; Figure 9d is a side view of the main swing arm 200 shown in Figure 9a; the main body 210 of the main swing arm 200 includes a first middle portion 211 and a first protrusion 212 and a second protrusion 213 respectively formed at both ends of the first middle portion 211; the first protrusion 212 and the second protrusion 213 are symmetrically arranged relative to the first middle portion 211; the first connection portion 220 of the main swing arm 200 is formed on the first protrusion 212, and the second connection portion 230 of the main swing arm 200 is formed on the second protrusion 213.

[0105] The main body 210 of the main swing arm 200 has a first upper mating surface 201 and a first lower mating surface 202; the top surface of the first middle portion 211 is formed as the first upper mating surface 201 (as shown in Figure 9b), and the bottom surfaces of the first protrusion 212 and the second protrusion 213 are respectively formed as a first lower mating surface 202 (as shown in Figure 9c); the first upper mating surface 201 and the first lower mating surface 202 are both arc surfaces.

[0106] As shown in Figure 9a, the first connecting portion 220 of the main swing arm 200 is provided with a first arcuate segment 221, and the second connecting portion 230 of the main swing arm 200 is provided with a second arcuate segment 231. The first connecting portion 220 of the main swing arm 200 is also provided with a first limiting protrusion 222, and the second connecting portion 230 is also provided with a third limiting protrusion 232. The first limiting protrusion 222 and the third limiting protrusion 232 are used to cooperate with the structure on the supporting screen door panel 300 to limit the rotation of the main swing arm 200.

[0107] As shown in FIG. 9 a , an anti-slip groove 2111 is provided at the top of the first middle portion 211 of the main swing arm 200 .

[0108] Furthermore, the main swing arm 200 can be an axisymmetric part, and the axis of symmetry of the main swing arm 200 is perpendicular to the extension direction of the center beam 100; the first connecting member and the second connecting member are symmetrically arranged relative to the axis of symmetry of the main swing arm 200, and the first arc segment 221 and the second arc segment 231 are symmetrically arranged relative to the axis of symmetry of the main swing arm 200.

[0109] From the above content, it can be seen that the forces on both sides of the symmetry axis of the axisymmetric parts are more balanced, which can make the forces on the central beam 100 and the supporting screen door panel 300 connected thereto more balanced. At the same time, compared with non-axisymmetric parts, axisymmetric parts are easier to process.

[0110] In some embodiments of the present application, as shown in Figures 10a to 10c, which are structural schematic diagrams of the first sub-beam 101 of the center beam 100 in Figure 8b at different viewing angles, a first sliding groove 110 is provided on the center beam 100, and in the extension direction of the center beam 100, two ends of the first sliding groove 110 are respectively formed as two makeshift grooves 111, and the makeshift grooves 111 are arranged corresponding to the first protrusions 310 of the screen door panel 300; when the rotating shaft mechanism 10 is in a folded state, the first protrusion 310 is located in the makeshift groove 111.

[0111] A spacer 112 is formed between the two give way grooves 111; a second protrusion 114 is formed on the center beam 100 above the spacer 112, and the second protrusion 114 covers the spacer 112; the bottom surface of the second protrusion 114 forms the top surface of the first slide groove 110; a third protrusion 113 is formed between the two give way grooves 111 and the spacer 112 respectively, and the top surface of the third protrusion 113 forms the bottom surface of the first slide groove 110.

[0112] In some embodiments of the present application, as shown in FIG11 , which is a perspective view of the screen-supporting door panel 300 in FIG7 b , a second chute 320 is provided on the screen-supporting door panel 300 at a position corresponding to the first connection portion 220 of the main swing arm 200, and a third chute 330 is provided at a position corresponding to the second connection portion 230 of the main swing arm 200, and the third chute 330 is provided at a position corresponding to the second connection portion 230 of the main swing arm 200, and the third chute 330 is provided at a position corresponding to the second arcuate segment 231. A second limiting protrusion is provided inside the second chute 320, and a fourth limiting protrusion is provided inside the third chute 330. The second limiting protrusion is used to cooperate with the first limiting protrusion 222, and the fourth limiting protrusion is used to cooperate with the third limiting protrusion 232 to limit the rotation of the main swing arm 200.

[0113] Specifically, the second sliding groove 320 and the third sliding groove 330 can be respectively formed on a first protruding portion 310 of the screen-supporting door panel 300 .

[0114] In some embodiments of the present application, as shown in FIG12 , which is a partially enlarged schematic diagram of FIG7 a , illustrating the connection relationship between the main swing arm 200 and the center beam 100 . The first middle portion 211 of the main swing arm 200 is installed in the spacer portion 112 of the center beam 100; the shape of the bottom surface of the second protrusion 114 of the center beam 100 is adapted to the shape of the first upper mating surface 201 of the first middle portion 211; the shapes of the top surfaces of the two third protrusions 113 of the center beam 100 are adapted to the shapes of the first lower mating surfaces 202 of the first protrusion 212 and the second protrusion 213 respectively; in the process of switching the rotating shaft mechanism 10 between the flattened state and the folded state, the first middle portion 211, the first protrusion 212 and the second protrusion 213 of the main swing arm 200 slide along the first slide groove 110, that is, the first upper mating surface 201 slides along the bottom surface of the second protrusion 114, and the first lower mating surface 202 slides along the bottom surface of the first slide groove 110, so that the main swing arm 200 rotates around the center beam 100.

[0115] From the above content, it can be seen that the first middle portion 211 connects the first protrusion portion 212 and the second protrusion portion 213, the first connection portion 220 is formed on the first protrusion portion 212, and the second connection portion 230 is formed on the second protrusion portion 213 to form an integrated structure. The first middle portion 211, the first protrusion portion 212 and the second protrusion portion 213 can slide in the first slide groove 110 of the center beam 100, thereby realizing the rotation of the main swing arm 200 around the center beam 100, and then realizing the rotation of the rotating shaft mechanism 10.

[0116] The first upper mating surface 201 is located between the two first lower mating surfaces 202. The first upper mating surface 201 and the first lower mating surface 202 are staggered in the thickness direction of the rotating shaft mechanism 10, forming a distributed mating surface in which the mating surfaces are not superimposed in the thickness direction of the rotating shaft mechanism 10. Correspondingly, the first slide groove 110 is formed as a distributed slide groove, which is beneficial to reducing the thickness of the center beam 100 in the thickness direction of the rotating shaft mechanism 10. At the same time, it is beneficial to the design of the wall thickness of the first slide groove 110, thereby ensuring the strength of the center beam 100.

[0117] The clearance groove 111 on the center beam 100 provides an accommodation space for the first protrusion 310 on the screen door panel 300, so that the center beam 100 and the screen door panel 300 will not interfere with each other during the folding process of the hinge mechanism 10.

[0118] Providing the spacer 112 is beneficial for reducing the weight of the rotating shaft mechanism 10 on the one hand, and on the other hand, arranging the first middle portion 211 of the main swing arm 200 in the spacer 112 can quickly position the main swing arm 200 for easy installation.

[0119] Figure 12 also shows the connection relationship between the main swing arm 200 and the screen door panel 300. The first arc segment 221 of the main swing arm 200 is set in the second slide groove 320, and the second arc segment 231 is set in the third slide groove 330. During the switching of the rotating shaft mechanism 10 between the flattened state and the folded state, the first arc segment 221 slides along the second slide groove 320, and the second arc segment 231 slides along the third slide groove 330, so that the screen door panel 300 and the main swing arm 200 rotate relative to each other.

[0120] When the rotating shaft mechanism 10 is in a flattened state, the first limiting protrusion 222 abuts against the second limiting protrusion inside the second slide groove 320, and the third limiting protrusion 232 abuts against the fourth limiting protrusion inside the third slide groove 330 to limit the main swing arm 200 from continuing to rotate; when the rotating shaft mechanism 10 is in a folded state, the first arc segment 221 abuts against the end of the second slide groove 320, and the second arc segment 231 abuts against the end of the third slide groove 330 to limit the main swing arm 200 from continuing to rotate.

[0121] As can be seen from the foregoing, by positioning the first curved segment 221 and the second curved segment 231 of the main swing arm 200 in the second and third chute 320 and 330 of the screen-supporting door panel 300, respectively, the curved surface of the main swing arm 200 cooperates with the curved surface of the screen-supporting door panel 300, enabling relative rotation between the screen-supporting door panel 300 and the main swing arm 200. This results in a simple structure. The provision of a limiting protrusion limits the rotation of the main swing arm 200, preventing the main swing arm 200 from causing the screen-supporting door panel 300 to rotate excessively, potentially damaging the flexible screen 30.

[0122] In some embodiments of the present application, as shown in FIG12 , the center beam 100 is further provided with an anti-dropout buckle 500. Specifically, referring again to FIG10a , a mounting hole 1141 is formed in the second protruding portion 114 of the center beam 100, and a mounting beam 1142 is disposed within the mounting hole 1141 for mounting the anti-dropout buckle 500. The anti-dropout buckle 500 can be secured to the second protruding portion 114 of the center beam 100 by bonding or welding. The anti-dropout groove 2111 of the main swing arm 200 has a first anti-dropout position 211a located closer to the center beam 100 when flattened, and a second anti-dropout position 211b located further away from the center beam 100.

[0123] Figures 13a to 13c are cross-sectional views at AA of Figure 12, respectively showing the structural schematic diagrams of the rotating shaft mechanism 10 in the flattened, folded and intermediate states. As shown in Figure 13a, when the rotating shaft mechanism 10 is in the flattened state, the anti-trip buckle 500 is located at the first anti-trip position 211a and is clamped with the anti-trip groove 2111; as shown in Figure 13b, when the rotating shaft mechanism 10 is in the folded state, the anti-trip buckle 500 is located at the second anti-trip position 211b and is clamped with the anti-trip groove 2111.

[0124] From the above content, it can be seen that the cooperation between the anti-drop buckle 500 and the anti-drop groove 2111 can limit the rotation of the main swing arm 200, preventing the rotating shaft mechanism 10 from rotating at too large an angle during the rotation process, causing damage to the flexible screen 30.

[0125] The anti-slip buckle 500 cooperates with the anti-slip groove 2111 and the limiting protrusion to ensure the reliability of the limitation and further prevent damage to the flexible screen 30 caused by excessive rotation of the screen-supporting door panel 300.

[0126] In some embodiments of the present application, as shown in Figure 14, which is a three-dimensional view of the auxiliary swing arm 400 in Figure 8b, the auxiliary swing arm 400 includes a rotating portion 410 formed at the first end of the auxiliary swing arm 400 and a sliding connection portion 420 formed at the second end of the auxiliary swing arm 400.

[0127] In the extension direction of the center beam 100, the rotating portion 410 includes a second intermediate portion 411 and two concave arcuate portions 412 formed on either side of the second intermediate portion 411. The top arcuate surface of the concave arcuate portion 412 forms the second upper mating surface 401. The bottom surface of the second intermediate portion 411 is formed with a first arcuate protrusion 4111. In the extension direction of the center beam 100, the bottom surface of the second intermediate portion 411 located on either side of the first arcuate protrusion 4111 forms the second lower mating surface. The sliding connection portion 420 includes two sliders 421 fixedly connected to the rotating portion 410.

[0128] The second end of the auxiliary swing arm 400 is provided with a hollow area 403 for accommodating the damping structure 700 .

[0129] Specifically, the auxiliary swing arm 400 can be an axisymmetric part, and the symmetry axis of the auxiliary swing arm 400 is perpendicular to the extension direction of the center beam 100; the two concave arc portions 412 are symmetrically arranged along the symmetry axis of the auxiliary swing arm 400, and the two sliding portions are symmetrically arranged along the symmetry axis of the auxiliary swing arm 400.

[0130] From the above content, it can be seen that the forces on both sides of the symmetry axis of the axisymmetric parts are more balanced, which can make the forces on the central beam 100 and the supporting screen door panel 300 connected thereto more balanced. At the same time, compared with non-axisymmetric parts, axisymmetric parts are easier to process.

[0131] In some embodiments of the present application, referring again to Figure 10a, a fourth slide groove 130 for mounting the first end of the auxiliary swing arm 400 is provided on the center beam 100, and a protruding structure 131 adapted to the shape of the concave arc-shaped portion 412 is provided at a position corresponding to the two concave arc-shaped portions 412 of the fourth slide groove 130; two concave structures 132 are formed on both sides of the protruding structure 131 in the extension direction perpendicular to the center beam 100; a first arc-shaped groove 133 corresponding to the first arc-shaped protrusion 4111 of the auxiliary swing arm 400 is formed at the bottom of the fourth slide groove 130; two second arc-shaped protrusions 134 are formed on both sides of the first arc-shaped groove 133 in the extension direction of the center beam 100.

[0132] In some embodiments of the present application, referring again to FIG. 11 , two fifth sliding grooves 340 are formed on the screen door panel 300, corresponding to the two sliders 421 of the auxiliary swing arm 400. Specifically, the screen door panel 300 may be provided with a hollow space for accommodating the auxiliary swing arm 400, and the two fifth sliding grooves 340 may be formed on either side of the hollow space in the extension direction of the center beam 100.

[0133] In some embodiments of the present application, as shown in Figure 15, which is a partial enlarged view of Figure 7a, showing the connection relationship between the auxiliary swing arm 400 and the center beam 100 and the screen-supporting door panel 300, the first end of the auxiliary swing arm 400 is rotatably connected to the center beam 100, and the second end of the auxiliary swing arm 400 is slidably connected to the screen-supporting door panel 300; in the process of switching the rotating shaft mechanism 10 between the folded state and the flattened state, the first end of the auxiliary swing arm 400 rotates relative to the center beam 100, and the second end of the auxiliary swing arm 400 slides relative to the screen-supporting door panel 300.

[0134] Specifically, as shown in Figure 15, when the hinge structure is in the flattened state, the concave arc-shaped portion 412 of the rotating portion 410 is respectively embedded in the two concave structures 132 of the center beam 100 along the two ends perpendicular to the extension direction of the center beam 100; when the hinge structure is in the folded state, one end of the concave arc-shaped portion 412 is located below the convex structure 131 of the center beam 100, and the other end of the concave arc-shaped portion 412 is located above the convex structure 131; in the process of switching the hinge mechanism 10 between the flattened state and the folded state, one end of the concave arc-shaped portion 412 slides in the fourth sliding groove 130; the other end of the concave arc-shaped portion 412 slides out of the fourth sliding groove 130.

[0135] It can be seen from the above content that the recessed structure 132 provides an accommodating space for the end of the recessed arc-shaped portion 412. Through the cooperation between the recessed arc-shaped portion 412, the recessed structure 132 and the protruding structure 131, the switching of the auxiliary swing arm 400 between the horizontal state and the vertical state is realized. During this process, the protruding structure 131 can prevent the auxiliary swing arm 400 from falling out of the fourth slide groove 130, and a part of the structure of the rotating portion 410 of the auxiliary swing arm 400 is always located in the fourth slide groove 130.

[0136] As shown in Figure 16a, the shape of the bottom surface of the second middle portion 411 of the auxiliary swing arm 400 is adapted to the shape of the bottom surface of the fourth slide groove 130 of the center beam 100, and the first arc-shaped protrusion 4111 of the second middle portion 411 is arranged in the first arc-shaped groove 133 of the fourth slide groove 130.

[0137] It can be seen from the above content that the first arc-shaped protrusion 4111 is arranged in the first arc-shaped groove 133, which can play a role in positioning the position of the auxiliary swing arm 400 in the fourth sliding groove 130.

[0138] The two concave arc-shaped portions 412 of the auxiliary swing arm 400 cooperate with the concave surface of the raised structure 131 of the center beam 100 to form the second upper mating surface 401 of the rotating portion 410; the bottom surface of the second middle portion 411 located on both sides of the first arc-shaped protrusion 4111 forms the second lower mating surface; in the process of switching the rotating shaft mechanism 10 between the flattened state and the folded state, the second upper mating surface 401 of the auxiliary swing arm 400 slides along the bottom surface of the raised structure 131 of the center beam 100, and the second lower mating surface of the second middle portion 411 slides along the top surfaces of the two second arc-shaped protrusions 134.

[0139] As can be seen from the above, the raised structure 131 is located on top of the concave arcuate portion 412, and the bottom surface of the raised structure 131 mates with the curved top surface of the concave arcuate portion 412. The second lower mating surface of the auxiliary swing arm 400 is located between the two second upper mating surfaces 401, forming a distributed mating surface in which the mating surfaces do not overlap in the thickness direction of the rotating shaft mechanism 10. Correspondingly, the fourth chute 130 is formed as a distributed chute, which helps reduce the thickness of the center beam 100 in the thickness direction of the rotating shaft mechanism 10. At the same time, it facilitates the design of the wall thickness of the fourth chute 130, thereby ensuring the strength of the center beam 100.

[0140] Specifically, as shown in Figure 16a, when the rotating shaft mechanism 10 is in the flattened state, the rotating portion 410 of the auxiliary swing arm 400 is embedded in the fourth slide groove 130 provided on the center beam 100; as shown in Figure 16b, when the rotating shaft mechanism 10 is in the folded state, the rotating portion 410 is in a vertical state, and its end portion remains in the fourth slide groove 130.

[0141] From the above content, it can be seen that the auxiliary swing arm 400 is set between the center beam 100 and the screen door panel 300 to assist the main swing arm 200 to jointly complete the folding or flattening of the rotating shaft mechanism 10, which can make the folding mechanism more synchronized.

[0142] The rotating part 410 of the auxiliary swing arm 400 is arranged in the fourth slide groove 130 of the middle beam 100, and the two cooperate to realize the rotational connection between the auxiliary swing arm 400 and the middle beam 100; the slider 421 on the sliding connection part 420 of the auxiliary swing arm 400 is arranged in the fifth slide groove 340 of the supporting screen door panel 300, and the two cooperate to realize the sliding of the auxiliary swing arm 400 and the supporting screen door panel 300, and the structure is simple.

[0143] When the hinge mechanism 10 switches between the flattened state and the folded state, the slider 421 slides along the fifth sliding groove 340 .

[0144] Specifically, the slider 421 can be a strip-shaped protrusion; the fifth sliding groove 340 can be a strip-shaped groove, and the strip-shaped protrusion is inserted into the strip-shaped groove. The arrangement of the strip-shaped protrusion directly inserted into the strip-shaped groove has the characteristics of simple structure.

[0145] In some embodiments of the present application, as shown in Figure 15, the rotating shaft mechanism 10 also includes an anti-slip block 600; the anti-slip block 600 is fixedly connected to the second middle portion 411 of the auxiliary swing arm 400, and the anti-slip block 600 is arranged in the first arc-shaped groove 133; during the switching of the rotating shaft mechanism 10 between the flattened state and the folded state, the anti-slip block 600 rotates in the first arc-shaped groove 133; a fifth limiting protrusion 1331 is provided inside the first arc-shaped groove 133.

[0146] Figures 16a to 16c are cross-sectional views at point BB of Figure 15, respectively showing schematic structural diagrams of the rotating shaft mechanism 10 in the flattened, folded and intermediate states. As shown in Figure 16b, when the rotating shaft mechanism 10 is in the folded state, the anti-slip block 600 is clamped with the fifth limiting protrusion 1331 to limit the auxiliary swing arm 400 from continuing to rotate.

[0147] From the above content, it can be seen that the anti-slip block 600 cooperates with the fifth limiting protrusion 1331 in the first arc-shaped groove 133 to limit the rotation of the auxiliary swing arm 400, thereby further limiting the rotation of the hinge mechanism 10, which is beneficial to prevent damage to the flexible screen 30 caused by excessive rotation angle.

[0148] In some embodiments of the present application, as shown in Figure 17, the damping structure 700 of the rotating shaft mechanism 10 includes a cam 710, an elastic member 720, a pushing frame 730, a hollow cover plate 740 and a connecting shaft 750; the cam 710 is rotatably connected to the first end of the pushing frame 730, and the first ends of the cam 710 and the pushing frame 730 are respectively provided with connecting holes, and the connecting shaft 750 is passed through the connecting hole of the cam 710 and the connecting hole of the pushing frame 730.

[0149] As shown in Figure 14 , a slide rail 404 is provided on the second end of the auxiliary swing arm 400. As shown in Figure 15 , the second end of the push frame 730 of the damping structure 700 is slidably connected to the second end of the auxiliary swing arm 400. The slide rail 404 is provided on the second end of the auxiliary swing arm 400, and a hollow cover plate 740 is provided to cover the slide rail 404 and expose the elastic member 720. The hollow cover plate 740 is fixedly connected to the auxiliary swing arm 400. The second end of the push frame 730 is slidably provided in the slide rail 404 of the auxiliary swing arm 400 and is located between the hollow cover plate 740 and the slide rail 404. The center beam 100 is also provided with a third protrusion 140, which is located within the hollow area 403 of the auxiliary swing arm 400.

[0150] Referring to Figure 16a again, the elastic member 720 is arranged between the second end of the pushing frame 730 and the side wall of the hollow area 403 of the auxiliary swing arm 400; a first connecting column 731 is provided on the second end of the pushing frame 730, and a second connecting column 405 corresponding to the first connecting column 731 is provided on the side wall of the hollow area 403 of the auxiliary swing arm 400; the elastic member 720 is a spring, and the two ends of the spring are respectively mounted on the first connecting column 731 and the second connecting column 405.

[0151] As shown in FIG16a , the outer surface of the cam 710 is in contact with the bottom surface of the third protrusion 140 . The bottom surface of the third protrusion 140 is an arcuate surface. A positioning groove 141 is provided on the bottom surface of the third protrusion 140 . When the rotating shaft structure is in the flattened state, the cam 710 is located in the positioning groove 141 . As shown in FIG16b , when the rotating shaft structure is in the folded state, the cam 710 is disengaged from the third protrusion 140 and located at the top of the third protrusion 140 , and the elastic member 720 is in the released state. During the transition of the rotating shaft mechanism 10 from the flattened state to the folded state, the cam 710 slides out of the positioning groove 141 and rolls along the bottom surface of the third protrusion 140 , causing the elastic member 720 to be compressed by the push frame 730 and the auxiliary swing arm 400 . When the cam 710 is disengaged from the bottom surface of the third protrusion 140 , the elastic member 720 is released.

[0152] From the above content, it can be seen that the damping structure 700 has an elastic member 720. When the hinge mechanism 10 switches between the flattened state and the folded state, the elastic member 720 is first compressed and then released, which can play a shock-absorbing role, making the rotation of the hinge mechanism 10 smoother.

[0153] The hollow design of the hollow cover plate 740 not only limits the push frame 730 , but also helps to reduce the weight of the middle beam 100 of the rotating shaft mechanism 10 , and provides a larger installation space for the elastic member 720 .

[0154] Referring to Figure 15 again, the synchronization mechanism 800 includes a first gear 810, a second gear 820, a first swing arm 830 and a second swing arm 840; the first gear 810 is fixedly connected to the first swing arm 830, and the second gear 820 is fixedly connected to the second swing arm 840; the first gear 810 and the second gear 820 are meshed with each other; the first swing arm 830 and the second swing arm 840 are fixedly connected to different screen-supporting door panels 300.

[0155] From the above content, it can be seen that the two swing arms in the synchronization mechanism 800 are respectively connected to different screen-supporting door panels 300. The first swing arm 830 drives the first screen-supporting door panel 301 to rotate, and the second swing arm 840 drives the second screen-supporting door panel 302 to rotate, thereby realizing the synchronous folding of the two screen-supporting door panels 300 of the rotating shaft mechanism 10.

[0156] The foldable electronic device 1 of the present application includes the hinge mechanism 10 of any of the above-mentioned embodiments. Compared with the solution in the related art that uses four screen-supporting door panels and the main swing arm is dispersedly fixed on two screen-supporting door panels close to the center beam, the first connection part 220 and the second connection part 230 of the main swing arm 200 in the hinge mechanism 10 of the foldable electronic device 1 of the present application are formed by extending from the main body 210, which is an integrated structure to form an integrated double-rotation main swing arm. The first connection part 220 and the second connection part 230 are rotatably connected to the same screen-supporting door panel 300. The first connection part 220 and the second connection part 230 are symmetrically arranged, which can make the force on the hinge mechanism 10 more balanced. In addition, the number of screen-supporting door panels 300 of the hinge mechanism 10 in the present application is two, and the number of parts is smaller, thereby reducing the number of parts of the foldable electronic device 1.

[0157] Another embodiment of the present application proposes a main swing arm 200, which is applied to a foldable electronic device 1. The foldable electronic device 1 includes a center beam 100 and two screen-supporting door panels 300 respectively arranged on both sides of the center beam 100; the main swing arm 200 is arranged between the center beam 100 and the screen-supporting door panels 300; the main swing arm 200 includes a main body 210, a first connecting portion 220 and a second connecting portion 230; the first connecting portion 220 and the second connecting portion 230 extend from both ends of the main body 210 and are symmetrically arranged; the first connecting portion 220 and the second connecting portion 230 of the main swing arm 200 are rotatably connected to the same screen-supporting door panel 300; the main body 210 of the main swing arm 200 includes a first middle portion 211 and a first protrusion 212 and a second protrusion 213 respectively formed at both ends of the first middle portion 211; the first protrusion 212 and the second protrusion 213 The raised portion 213 is symmetrically arranged relative to the first middle portion 211; the first connecting portion 220 of the main swing arm 200 is formed on the first raised portion 212, and the second connecting portion 230 of the main swing arm 200 is formed on the second raised portion 213; a first slide groove 110 is provided on the middle beam 100, and the main body 210 of the main swing arm 200 is installed in the first slide groove 110, and the main body 210 is rotatably connected to the middle beam 100; multiple main swing arms 200 drive two screen door panels 300 to rotate toward each other or back to back around the middle beam 100, so that the foldable electronic device 1 is in a folded state or a flattened state; in the process of switching the foldable electronic device 1 between the flattened state and the folded state, the first middle portion 211, the first raised portion 212 and the second raised portion 213 slide along the first slide groove 110, so that the main swing arm 200 rotates around the middle beam 100.

[0158] The main swing arm 200 of the present application is applied to a foldable electronic device 1, which includes a center beam 100 and two screen-supporting door panels 300 respectively arranged on both sides of the center beam 100; the main swing arm 200 is arranged between the center beam 100 and the screen-supporting door panels 300; the first connecting portion 220 and the second connecting portion 230 of the main swing arm 200 extend from both ends of the main body 210 of the main swing arm 200 and are symmetrically arranged; the first connecting portion 220 and the second connecting portion 230 are rotatably connected to the same screen-supporting door panel 300; the main body 210 of the main swing arm 200 includes a first middle portion 211 and a first protrusion 212 and a second protrusion 213 respectively formed at both ends of the first middle portion 211; the first protrusion 212 and the second protrusion 213 are symmetrically arranged relative to the first middle portion 211 The first connecting portion 220 of the main swing arm 200 is formed on the first protruding portion 212, and the second connecting portion 230 of the main swing arm 200 is formed on the second protruding portion 213; a first sliding groove 110 is provided on the middle beam 100, and the main body 210 of the main swing arm 200 is installed in the first sliding groove 110, and the main body 210 is rotatably connected to the middle beam 100; multiple main swing arms 200 drive two screen door panels 300 to rotate toward each other or back to back around the middle beam 100, so that the foldable electronic device 1 is in a folded state or a flattened state; in the process of switching the foldable electronic device 1 between the flattened state and the folded state, the first middle portion 211, the first protruding portion 212 and the second protruding portion 213 slide along the first sliding groove 110, so that the main swing arm 200 rotates around the middle beam 100. The first connection part 220 and the second connection part 230 of the main swing arm 200 of the present application are formed by extending from the main body 210, which is an integrated structure, forming an integrated double-rotation main swing arm. The first connection part 220 and the second connection part 230 are symmetrically arranged, and the first connection part 220 and the second connection part 230 are rotatably connected to the same screen-supporting door panel 300, which can make the force on the main swing arm 200 and the screen-supporting door panel 300 connected thereto more balanced.

[0159] Another embodiment of the present application proposes a secondary swing arm 400, which is applied to a foldable electronic device 1. The foldable electronic device 1 includes a center beam 100 and two screen-supporting door panels 300 respectively arranged on both sides of the center beam 100; the secondary swing arm 400 is arranged between the center beam 100 and the screen-supporting door panels 300; the first end of the secondary swing arm 400 is rotatably connected to the center beam 100, and the second end of the secondary swing arm 400 is slidably connected to the screen-supporting door panels 300; the secondary swing arm 400 includes a rotating portion 410 formed at the first end of the secondary swing arm 400 and a sliding connection portion 420 formed at the second end of the secondary swing arm 400; when the foldable electronic device 1 is in In the flattened state, the rotating part 410 is embedded in the fourth slide groove 130 provided on the central beam 100; when the foldable electronic device 1 is in the folded state, the rotating part 410 is in a vertical state, and its end portion remains in the fourth slide groove 130; the sliding connection part 420 includes two sliders 421 fixedly connected to the rotating part 410; two fifth slide grooves 340 corresponding to the two sliders 421 are formed on the screen door panel 300; in the process of switching the foldable electronic device 1 between the folded state and the flattened state, the rotating part 410 and the fourth slide groove 130 rotate relative to each other, and the slider 421 slides along the fifth slide groove 340.

[0160] The auxiliary swing arm 400 of the present application is applied to a foldable electronic device 1, which includes a center beam 100 and two screen-supporting door panels 300 respectively arranged on both sides of the center beam 100; the auxiliary swing arm 400 is arranged between the center beam 100 and the screen-supporting door panels 300; the first end of the auxiliary swing arm 400 is rotatably connected to the center beam 100, and the second end of the auxiliary swing arm 400 is slidably connected to the screen-supporting door panels 300; the auxiliary swing arm 400 includes a rotating portion 410 formed at the first end of the auxiliary swing arm 400 and a sliding connection portion 420 formed at the second end of the auxiliary swing arm 400; when the foldable electronic device 1 is in a flat state, The rotating portion 410 is embedded in the fourth slide groove 130 provided on the center beam 100; when the foldable electronic device 1 is in the folded state, the rotating portion 410 is in a vertical state, and its end portion is maintained in the fourth slide groove 130; the sliding connection portion 420 includes two sliders 421 fixedly connected to the rotating portion 410; two fifth slide grooves 340 corresponding to the two sliders 421 are formed on the screen door panel 300; when the foldable electronic device 1 switches between the folded state and the flattened state, the rotating portion 410 rotates relative to the fourth slide groove 130, and the sliders 421 slide along the fifth slide groove 340. The auxiliary swing arm 400 of the present application has a first end rotatably connected to the center beam 100 and a second end slidably connected to the screen door panel 300, which assists the rotation of the foldable electronic device 1 and improves the synchronization of the rotation of the foldable electronic device 1.

[0161] It should be noted that in the examples and description of this patent, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0162] Although the present application has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the application.

Claims

1. A rotating shaft mechanism, characterized in that: Application in foldable electronic devices; The rotating shaft mechanism comprises: a middle beam, a plurality of main swing arms and two screen-supporting door panels respectively arranged on both sides of the middle beam; At least one main swing arm is arranged between the middle beam and any one of the screen-supporting door panels; Each of the main swing arms comprises: a main body, a first connection part and a second connection part; the first connection part and the second connection part extend out of two ends of the main body and are symmetrically arranged, and form an integral structure with the main body; the main body of the main swing arm is installed on the middle beam and is rotatably connected to the middle beam; the first connection part and the second connection part of the main swing arm are rotatably connected to the same supporting screen door panel; The multiple main swing arms drive the two screen-supporting door panels to rotate toward each other or away from each other around the central beam, so that the rotating shaft mechanism is in a folded state or a flattened state.

2. The rotating shaft mechanism according to claim 1, characterized in that: The main body of the main swing arm includes a first middle portion and a first convex portion and a second convex portion respectively formed at two ends of the first middle portion; The first protruding portion and the second protruding portion are symmetrically arranged relative to the first middle portion; The first connecting portion of the main swing arm is formed on the first protruding portion, and the second connecting portion of the main swing arm is formed on the second protruding portion; A first slide groove is provided on the middle beam, and the main body of the main swing arm is installed in the first slide groove; During the switching of the rotating shaft mechanism between the flattened state and the folded state, the first middle portion, the first protruding portion and the second protruding portion slide along the first sliding groove, so that the main swing arm rotates around the center beam.

3. The rotating shaft mechanism according to claim 2, characterized in that: The main body of the main swing arm has a first upper mating surface and a first lower mating surface; The top surface of the first middle portion is formed as the first upper mating surface, and the bottom surfaces of the first protruding portion and the second protruding portion are respectively formed as the first lower mating surface; The first upper mating surface and the first lower mating surface are both arc surfaces; The shape of the top surface of the first slide groove of the middle beam is matched with the shape of the first upper matching surface, and the shape of the bottom surface of the first slide groove of the middle beam is matched with the shape of the first lower matching surface; During the switching of the rotating shaft mechanism between the flattened state and the folded state, the first upper mating surface slides along the top surface of the first sliding groove, and the first lower mating surface slides along the bottom surface of the first sliding groove.

4. The rotating shaft mechanism according to claim 3, characterized in that: In the extension direction of the middle beam, two ends of the first slide groove are respectively formed as two make way grooves, and the make way grooves are arranged corresponding to the first protruding portion of the screen supporting door plate; When the rotating shaft mechanism is in a folded state, the first protrusion is located in the clearance groove; A spacer is formed between the two clearance grooves, and the first middle portion of the main swing arm is arranged in the spacer; The middle beam is formed with a second protruding portion above the spacer portion, and the second protruding portion covers the spacer portion; the bottom surface of the second protruding portion is formed as the top surface of the first sliding groove; A third protrusion is formed between the two clearance grooves and the spacing portion respectively, and the top surface of the third protrusion is formed as the bottom surface of the first sliding groove.

5. The rotating shaft mechanism according to claim 4, characterized in that: The middle beam is also provided with an anti-drop buckle; The top of the first middle portion of the main swing arm is provided with an anti-slip groove, and the anti-slip groove has a shape close to a first anti-slip position of the center beam and a second anti-slip position away from the center beam; When the rotating shaft mechanism is in a flattened state, the anti-drop buckle is located at the first anti-drop position and is clamped with the anti-drop groove; when the rotating shaft mechanism is in a folded state, the anti-drop buckle is located at the second anti-drop position and is clamped with the anti-drop groove.

6. The rotating shaft mechanism according to any one of claims 1 to 5, characterized in that: A first arc segment is provided on the first connecting portion of the main swing arm, and a second arc segment is provided on the second connecting portion of the main swing arm; A second slide groove matching the shape of the first arc segment is provided on the screen-supporting door panel at a position corresponding to the first connection portion of the main swing arm, and a third slide groove matching the shape of the second arc segment is provided at a position corresponding to the second connection portion of the main swing arm; During the switching of the rotating shaft mechanism between the flattened state and the folded state, the first arc segment slides along the second slide groove, and the second arc segment slides along the third slide groove, so that the screen-supporting door panel and the main swing arm rotate relative to each other.

7. The rotating shaft mechanism according to claim 6, characterized in that: A first limiting protrusion is provided on the first connecting portion of the main swing arm, and a second limiting protrusion corresponding to the first limiting protrusion is provided inside the second sliding groove; The second connecting portion is provided with a third limiting protrusion, and the interior of the third sliding groove is provided with a fourth limiting protrusion corresponding to the second limiting protrusion; When the rotating shaft mechanism is in a flattened state, the first limiting protrusion abuts against the second limiting protrusion inside the second sliding groove, and the third limiting protrusion abuts against the fourth limiting protrusion inside the third sliding groove, so as to limit the main swing arm from continuing to rotate; When the rotating shaft mechanism is in a folded state, the first arc segment abuts against the end of the second slide slot, and the second arc segment abuts against the end of the third slide slot, so as to limit the main swing arm from further rotating.

8. The rotating shaft mechanism according to claim 6, characterized in that: The main swing arm is an axisymmetric part, and the symmetry axis of the main swing arm is perpendicular to the extension direction of the center beam; The first connecting member and the second connecting member are symmetrically arranged with respect to the symmetry axis of the main swing arm, and the first arc segment and the second arc segment are symmetrically arranged with respect to the symmetry axis of the main swing arm.

9. The rotating shaft mechanism according to claim 1, characterized in that: At least one auxiliary swing arm is further provided between the middle beam and any of the supporting screen door panels; The first end of the auxiliary swing arm is rotatably connected to the middle beam, and the second end of the auxiliary swing arm is slidably connected to the supporting screen door panel; During the switching of the rotating shaft mechanism between the folded state and the flattened state, the first end of the auxiliary swing arm rotates relative to the center beam, and the second end of the auxiliary swing arm slides relative to the supporting screen door panel.

10. The rotating shaft mechanism according to claim 9, characterized in that: The auxiliary swing arm includes a rotating portion formed at a first end of the auxiliary swing arm and a sliding connection portion formed at a second end of the auxiliary swing arm; When the rotating shaft mechanism is in a flattened state, the rotating part is embedded in a fourth slide groove provided on the middle beam; when the rotating shaft mechanism is in a folded state, the rotating part is in a vertical state, and its end is kept in the fourth slide groove; The sliding connection part includes two sliding blocks fixedly connected to the rotating part; The screen-supporting door plate is formed with two fifth sliding grooves corresponding to the two sliding blocks respectively; When the rotating shaft mechanism switches between the flattened state and the folded state, the sliding block slides along the fifth sliding groove.

11. The rotating shaft mechanism according to claim 10, characterized in that: In the extension direction of the middle beam, the rotating portion includes a second middle portion and two concave arc portions respectively formed on both sides of the second middle portion; The fourth slide groove is provided with a convex structure matching the shape of the concave arc-shaped portions at a position corresponding to the two concave arc-shaped portions; The concave surfaces of the two concave arc-shaped portions and the convex structure that cooperate with each other form a second upper matching surface of the rotating portion; The bottom surface of the second middle portion is formed as a second lower mating surface of the rotating portion; The shape of the bottom surface of the second middle portion matches the shape of the bottom surface of the fourth sliding groove.

12. The rotating shaft mechanism according to claim 11, characterized in that: Two concave structures are formed on both sides of the protruding structure in a direction perpendicular to the extension direction of the middle beam; When the rotating shaft structure is in a flattened state, the two ends of the concave arc portion along the extending direction perpendicular to the middle beam are respectively embedded in the two concave structures; When the rotating shaft structure is in a folded state, one end of the concave arc-shaped portion is located below the convex structure, and the other end of the concave arc-shaped portion is located above the convex structure; During the switching process of the rotating shaft mechanism between the flattened state and the folded state, one end of the recessed arc-shaped portion slides in the fourth sliding groove; and the other end of the recessed arc-shaped portion slides out of the fourth sliding groove.

13. The rotating shaft mechanism according to claim 12, characterized in that: A first arc-shaped protrusion is formed on the bottom surface of the second middle portion; A first arc-shaped groove corresponding to the first arc-shaped protrusion is formed at the bottom of the fourth sliding groove, and the first arc-shaped protrusion is arranged in the first arc-shaped groove; In the extension direction of the middle beam, the bottom surface of the second middle portion located on both sides of the first arc-shaped protrusion forms the second lower mating surface; In the extension direction of the middle beam, two second arc-shaped protrusions are formed on both sides of the first arc-shaped groove; During the switching process between the flattened state and the folded state of the rotating shaft mechanism, the second lower matching surface of the second middle portion slides along the top surfaces of the two second arc-shaped protrusions.

14. The rotating shaft mechanism according to claim 13, characterized in that: The rotating shaft mechanism also includes an anti-dropping block; The anti-slip block is fixedly connected to the second middle portion of the auxiliary swing arm, and the anti-slip block is arranged in the first arc-shaped groove; When the rotating shaft mechanism switches between the flattened state and the folded state, the anti-dropping block rotates in the first arc-shaped groove; A fifth limiting protrusion is provided inside the first arc-shaped groove; When the rotating shaft mechanism is in a folded state, the anti-dropping block is clamped with the fifth limiting protrusion to limit the auxiliary swing arm from further rotating.

15. The rotating shaft mechanism according to claim 14, characterized in that: The auxiliary swing arm is an axisymmetric part, and the axis of symmetry of the auxiliary swing arm is perpendicular to the extension direction of the center beam; The two concave arc portions are symmetrically arranged along the symmetry axis of the auxiliary swing arm, and the two sliding portions are symmetrically arranged along the symmetry axis of the auxiliary swing arm.

16. The rotating shaft mechanism according to claim 13, characterized in that: The sliding block is a strip-shaped protrusion; the fifth sliding groove is a strip-shaped groove, and the strip-shaped protrusion is inserted into the strip-shaped groove.

17. The rotating shaft mechanism according to any one of claims 9 to 16, characterized in that: The rotating shaft mechanism also includes a damping structure; The second end of the auxiliary swing arm is provided with a hollow area for accommodating the damping structure; The damping structure comprises a cam, an elastic member and a push frame; The middle beam is provided with a third protrusion for abutting against the cam, and the third protrusion is located in the hollow area of ​​the auxiliary swing arm; The cam is rotatably connected to the first end of the push frame; The elastic member is arranged between the second end of the push frame and the side wall of the hollow area of ​​the auxiliary swing arm; The second end of the push frame is slidably connected to the second end of the auxiliary swing arm; The outer surface of the cam is in contact with the bottom surface of the third protrusion; the bottom surface of the third protrusion is an arc-shaped surface; a positioning groove is provided on the bottom surface of the third protrusion; When the rotating shaft structure is in a flattened state, the cam is located in the positioning groove; When the rotating shaft structure is in a folded state, the cam is separated from the third protruding portion and is located on the top of the third protruding portion, and the elastic member is in a released state; During the transition of the rotating shaft mechanism from the flattened state to the folded state, the cam slides out of the positioning groove and rolls along the bottom surface of the third protrusion, so that the elastic member is compressed by the push frame and the auxiliary swing arm; when the cam disengages from the bottom surface of the third protrusion, the elastic member is released.

18. The rotating shaft mechanism according to claim 17, characterized in that: The damping structure also includes a hollow cover plate and a connecting shaft; The first ends of the cam and the push frame are respectively provided with connecting holes, and the connecting shaft is inserted into the connecting hole of the cam and the connecting hole of the push frame; A slide rail is provided on the second end of the auxiliary swing arm, and the hollow cover plate covers the slide rail and exposes the elastic member; The hollow cover plate is fixedly connected to the auxiliary swing arm; the second end of the push frame is slidably disposed in the slide rail and is located between the hollow cover plate and the slide rail; A first connecting column is provided on the second end of the push frame, and a second connecting column corresponding to the first connecting column is provided on the side wall of the hollow area of ​​the auxiliary swing arm; The elastic member is a spring, and two ends of the spring are respectively sleeved on the first connecting column and the second connecting column.

19. The rotating shaft mechanism according to claim 18, characterized in that: The middle beam comprises a first sub-beam, a second sub-beam and a third sub-beam connected in sequence; The first sub-beam and the second sub-beam are connected via a synchronization mechanism, and the second sub-beam and the third sub-beam are connected via another synchronization mechanism; The synchronization mechanism comprises a first gear, a second gear, a first swing arm and a second swing arm; the first gear is fixedly connected to the first swing arm, and the second gear is fixedly connected to the second swing arm; the first gear and the second gear are meshed with each other; The first swing arm and the second swing arm are fixedly connected to different screen-supporting door panels; The two screen-supporting door panels include a first screen-supporting door panel and a second screen-supporting door panel; The first sub-beam and the third sub-beam are both connected to the first screen-supporting door panel through one main swing arm and one auxiliary swing arm, and are connected to the second screen-supporting door panel through one main swing arm and one auxiliary swing arm; the second sub-beam is respectively connected to the first screen-supporting door panel and the second screen-supporting door panel through two main swing arms.

20. A foldable electronic device, characterized in that: It comprises a flexible screen, a hinge mechanism according to any one of claims 1 to 19, and two middle frames respectively arranged on both sides of the hinge mechanism; The two middle frames are respectively connected to the two screen-supporting door panels of the rotating shaft mechanism; the flexible screen covers the two middle frames and the rotating shaft mechanism; During the switching of the hinge mechanism between the flattened state and the folded state, the two middle frames, driven by the two screen-supporting door panels, rotate toward or away from each other around the hinge mechanism, so that the foldable electronic device is in a folded state or a flattened state.

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