CN115135049B

CN115135049B - Folding mechanism and electronic equipment

Info

Publication number: CN115135049B
Application number: CN202110326440.6A
Authority: CN
Inventors: 刘雨; 赵梓杰; 邢冲; 杜俊龙; 陆郁飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2023-09-12
Anticipated expiration: 2041-03-26
Also published as: CN115135049A

Abstract

The embodiment of the application provides a folding mechanism and electronic equipment. The folding mechanism comprises: first and second racks; two guide rods, two ends of which are fixedly connected with the first and second frames respectively; the pushing piece comprises a pushing block, a supporting body connected with the pushing block, and a first arc-shaped body and a second arc-shaped body which are arranged on the supporting body, and two ends of the pushing block are respectively penetrated through two guide rods; the two swing arms are respectively and rotatably connected with two guide rods between the first frame and the push block; the elastic piece is arranged between the pushing block and the second rack in a compressed mode; the two swing arms are in a flattened or folded state, the first arc-shaped body is abutted against the concave part of the first swing arm, the second arc-shaped body is abutted against the concave part of the second swing arm, and the elastic piece is of a first compression amount; the two swing arms are in a bending state, the first arc body is abutted against the flat part of the first swing arm, the second arc body is abutted against the flat part of the second swing arm, and the elastic piece is of a second compression amount larger than the first compression amount. The application can accurately and reliably limit, and has simple structure and smaller volume.

Description

Folding mechanism and electronic equipment

Technical Field

The present application relates to the field of display technologies, and in particular, to a folding mechanism and an electronic device.

Background

Foldable electronic devices generally exhibit both a folded and a flattened state. In the folded state, the equipment occupation area is smaller, the carrying and the storage are convenient, and in the flattened state, a larger screen can be provided, so that the user can watch conveniently. Therefore, the foldable electronic equipment has the advantages of portability and large display area, and has become an emerging technical innovation point in the industry at present. The folding mechanism of the existing foldable electronic equipment is complex in structure, large in size or incapable of accurately and reliably limiting, so that the screen cannot be stably in a flattened state or a folded state.

Disclosure of Invention

The embodiment of the application provides a folding mechanism and electronic equipment, which can accurately and reliably limit, ensure that the electronic equipment using the folding mechanism can be stably in a flattened state or a folded state, and have simple structure and smaller volume.

For this purpose, the embodiment of the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides a folding mechanism, including: a first rack and a second rack; the first guide rod and the second guide rod are oppositely arranged at intervals, one end of the first guide rod is fixedly connected with the first rack, the other end of the first guide rod is fixedly connected with the second rack, one end of the second guide rod is fixedly connected with the first rack, and the other end of the second guide rod is fixedly connected with the second rack; the pushing piece comprises a pushing block, a supporting body connected with the pushing block, and a first arc body and a second arc body which are arranged on the supporting body, wherein a first hole is formed in the first end of the pushing block, a second hole is formed in the second end of the pushing block, a first guide rod penetrates through the first hole to be arranged at the first end of the pushing block, and a second guide rod penetrates through the second hole to be arranged at the second end of the pushing block; the first swing arm is rotatably connected with the first guide rod between the first frame and the first end of the pushing block, the second swing arm is rotatably connected with the second guide rod between the first frame and the second end of the pushing block, the first arc-shaped body abuts against the first swing arm, and the second arc-shaped body abuts against the second swing arm; the elastic piece is arranged between the pushing block and the second rack in a compressed mode; the first swing arm is provided with a first concave part and a first flat part along the circumferential direction of the first guide rod, the shape of the first concave part is matched with that of a part of the first arc body, and the first flat part is close to the elastic piece relative to the first concave part; the second swing arm is provided with a second concave part and a second flat part along the circumferential direction of the second guide rod, the shape of the second concave part is matched with that of a part of the second arc body, and the second flat part is close to the elastic piece relative to the second concave part; when the first swing arm and the second swing arm rotate relatively, the first concave part and the first flat part move around the circumference of the first guide rod relative to the first arc body, and the second concave part and the second flat part move around the circumference of the second guide rod relative to the second arc body; when the first swing arm and the second swing arm are in a flattened state or a folded state, the first arc-shaped body abuts against the first concave part, the second arc-shaped body abuts against the second concave part, and the compression amount of the elastic piece is a first compression amount; when the first swing arm and the second swing arm are in a bending state, the first arc body abuts against the first flat portion, the second arc body abuts against the second flat portion, the compression amount of the elastic piece is the second compression amount, the first compression amount is smaller than the second compression amount, and the bending state is a state between the flattening state and the folding state.

Because the elastic piece between the pushing block of the pushing piece and the second rack is arranged in a compressed mode, the elastic piece can provide elastic force, so that the pushing piece extrudes the first swing arm and the second swing arm towards the first rack, when external force acts, the first swing arm and the second swing arm can rotate relatively under the action of the external force, and therefore the switching between the flattening state and the folding state can be achieved, and the use requirements of different states of a user are met; when the external force stops acting, the first swing arm and the second swing arm can be kept at fixed positions under the extrusion action of the pushing piece. In addition, in order to reliably limit the positions of the first swing arm and the second swing arm, the first swing arm is provided with a first concave part, the second swing arm is provided with a second concave part, the pushing piece is provided with a first arc-shaped body and a second arc-shaped body, when the first swing arm and the second swing arm are in a flattened state or in a folded state, the first arc-shaped body on the pushing piece pushed by the elastic piece is abutted against the first concave part and the second arc-shaped body is abutted against the second concave part, so that relative movement between the arc-shaped body and the concave part is difficult to occur, and reliable limiting is realized. Meanwhile, the folding mechanism is simple in structure and small in size, and is beneficial to achieving miniaturization and reducing cost.

In one possible implementation manner, the first swing arm drives the first arc-shaped body to rotate when rotating; the second swing arm drives the second arc body to rotate when rotating. Therefore, rolling friction is adopted between the first swing arm and the first arc-shaped body, rolling friction is adopted between the second swing arm and the second arc-shaped body, and under the condition that other conditions are the same, rolling friction force is smaller than sliding friction force, so that the resistance moment to be overcome when the first swing arm and the second swing arm rotate is smaller, switching between a folding state and a flattening state is facilitated, and reliable limiting of the folding state and the flattening state cannot be influenced.

In one possible implementation, the axis of rotation of the first swing arm is perpendicular to the axis of rotation of the first arcuate body; the rotation axis of the second swing arm is perpendicular to the rotation axis of the second arc body. Therefore, the end face of the first swing arm is tangent to the periphery of the first arc-shaped body, so that the first arc-shaped body can be driven to rotate better when the first swing arm rotates, and sliding friction between the first swing arm and the first arc-shaped body is reduced or avoided as much as possible. And in the same way, the end face of the second swing arm is tangent to the periphery of the second arc body, so that the second arc body can be driven to rotate better when the second swing arm rotates, and the sliding friction between the second swing arm and the second arc body is reduced or avoided as much as possible.

In one possible implementation, the first arcuate body and the second arcuate body comprise a roller or sphere or a portion of a roller or a portion of a sphere, respectively. That is, the first arcuate body and the second arcuate body may be a complete roller or a complete sphere, or may be a part of a roller or a part of a sphere, as long as it is ensured that the surface of the first arcuate body that contacts the first swing arm is an arc surface and the surface of the second arcuate body that contacts the second swing arm is an arc surface when the two swing arms are rotated between the folded state and the flattened state.

In one possible implementation, the support comprises: the first support piece is connected with the push block and extends towards the first rack along the extending direction of the first guide rod and the second guide rod; the second support piece is arranged on the first support piece, the extending direction of the second support piece is perpendicular to the extending directions of the first guide rod and the second guide rod, the first arc-shaped body is arranged at one end of the second support piece, and the second arc-shaped body is arranged at the other end of the second support piece. Thus, the support body and the two swing arms can not interfere, and the first arc body and the second arc body are conveniently arranged on the support body in a rotating mode.

In one possible implementation manner, the second supporting piece is fixedly connected with the first supporting piece, and the first arc-shaped body and the second arc-shaped body are respectively and rotatably connected with two ends of the second supporting piece, so that the first arc-shaped body and the second arc-shaped body can rotate relative to the first supporting piece and the second supporting piece, the volume of the rotating part is smaller, and smooth rotation is easy to realize; or, the second support piece is rotatably arranged on the first support piece, and the first arc-shaped body and the second arc-shaped body are fixedly connected with two ends of the second support piece respectively. Thus, the first arc body and the second arc body can rotate together with the second supporting piece relative to the first supporting piece, and the rotation of the first arc body and the rotation of the second arc body are synchronous, so that the two swing arms respectively contacted with the first arc body and the second arc body can smoothly and synchronously rotate.

In one possible implementation, the elastic member includes a first spring and a second spring, the first spring is sleeved on the first guide rod, and the second spring is sleeved on the second guide rod. In this way, the first spring, which is guaranteed to be in a compressed state, can provide an elastic force along the extension direction of the first guide bar and the second spring, which is guaranteed to be in a compressed state, can provide an elastic force along the extension direction of the second guide bar. Meanwhile, the elastic piece is simple in structure, and is beneficial to reducing the volume and the cost.

In one possible implementation, the first swing arm includes a first swing portion and a first swivel connected to the first swing portion, the first swivel being rotatably connected to the first guide bar, wherein: the first arc body is abutted against the annular end face of the first swivel, the first concave part and the first flat part are arranged on the annular end face of the first swivel, namely, the first arc body is abutted against the annular end face of the first swivel of the first swing arm, when the first swing arm rotates around the first guide rod, the first flat part and the first concave part on the annular end face rotate around the first guide rod along with the first swivel, so that the first arc body is switched from abutting against the first flat part to abutting against the first concave part or from abutting against the first concave part to abutting against the first flat part; or, a first arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the first swivel, the first arc-shaped body is abutted against the first arc-shaped positioning boss, the first concave part and the first flat part are arranged on the first arc-shaped positioning boss, that is, the first arc-shaped body is abutted against the first arc-shaped positioning boss on the first swivel, when the first swing arm rotates around the first guide rod, the first flat part and the first concave part on the first arc-shaped positioning boss rotate around the first guide rod along with the first swivel, so that the first arc-shaped body is switched from abutting against the first flat part to abutting against the first concave part or from abutting against the first concave part to abutting against the first flat part; the second swing arm includes second swing portion and the second swivel that links to each other with second swing portion, and the second swivel rotates with the second guide arm and is connected, wherein: the second arc body is abutted against the annular end face of the second swivel, the second concave part and the second flat part are arranged on the annular end face of the second swivel, namely, the second arc body is abutted against the annular end face of the second swivel of the second swing arm, and when the second swing arm rotates around the second guide rod, the second flat part and the second concave part on the annular end face rotate around the second guide rod along with the second swivel, so that the second arc body is switched from abutting against the second flat part to abutting against the second concave part or from abutting against the second concave part to abutting against the second flat part; or, a second arc-shaped positioning boss protruding outwards along the radial direction is arranged on the outer peripheral wall of the second swivel, the second arc-shaped body is abutted against the second arc-shaped positioning boss, the second concave part and the second flat part are arranged on the second arc-shaped positioning boss, that is, the second arc-shaped body is abutted against the second arc-shaped positioning boss on the second swivel, and when the second swing arm rotates around the second guide rod, the second flat part and the second concave part on the second arc-shaped positioning boss rotate around the second guide rod along with the second swivel, so that the second arc-shaped body is switched from abutting against the second flat part to abutting against the second concave part or from abutting against the second concave part to abutting against the second flat part.

In one possible implementation, the first swing arm is provided with two first recesses, the first flat portion is located between the two first recesses, the second swing arm is provided with two second recesses, and the second flat portion is located between the two second recesses; when the first arc body abuts against the first one of the two first concave parts and the second arc body abuts against the first one of the two second concave parts, the first swing arm and the second swing arm are in a flattened state; when the first arc body abuts against the second of the two first concave portions and the second arc body abuts against the second of the two second concave portions, the first swing arm and the second swing arm are in a folded state therebetween. In this way, the two swing arms can be reliably limited to the flattened state or the folded state, and in the folded state between the flattened state and the folded state, the two swing arms can be easily rotated due to the arc body abutting against the flat portion.

In one possible implementation, the folding mechanism further includes: the first gasket is sleeved on the first guide rod between the first frame and the first swing arm, and the second gasket is sleeved on the second guide rod between the first frame and the second swing arm; or, the third spring and the fourth spring are sleeved on the first guide rod between the first frame and the first swing arm, and the fourth spring is sleeved on the second guide rod between the first frame and the second swing arm. Thus, when the first swing arm rotates, friction between the annular end face of the first swivel of the first swing arm and the first frame can be avoided, and when the second swing arm rotates, friction between the annular end face of the second swivel of the second swing arm and the first frame can be avoided. In addition, because the cross section area of the gasket or the spring is smaller, the gasket or the spring is contacted with the annular end face of the swivel of the swing arm, so that friction between the gasket or the spring and the swivel is reduced, and the swing arm is easy to rotate.

In a second aspect, embodiments of the present application provide a folding mechanism, the folding mechanism comprising: a first rack and a second rack; the first guide rod and the second guide rod are oppositely arranged at intervals, one end of the first guide rod is connected with the first rack, and the other end of the first guide rod is connected with the second rack; one end of the second guide rod is connected with the first rack, and the other end of the second guide rod is connected with the second rack; the pushing piece comprises a pushing block, a supporting body connected with the pushing block, and a first arc body and a second arc body which are arranged on the supporting body, wherein a first hole is formed in the first end of the pushing block, a second hole is formed in the second end of the pushing block, a first guide rod penetrates through the first hole to be arranged at the first end of the pushing block, and a second guide rod penetrates through the second hole to be arranged at the second end of the pushing block; the first swinging arm is connected with the first guide rod between the first frame and the first end of the pushing block, the second swinging arm is connected with the second guide rod between the first frame and the second end of the pushing block, the first arc-shaped body is abutted against one of the first swinging arm and the first guide rod, and the second arc-shaped body is abutted against one of the second swinging arm and the second guide rod; the elastic piece is arranged between the pushing block and the second rack in a compressed mode; one of the first swing arm and the first guide rod is provided with a first concave part and a first flat part along the circumferential direction of the first guide rod, the shape of the first concave part is matched with that of a part of the first arc body, and the first flat part is close to the elastic piece relative to the first concave part; one of the second swing arm and the second guide rod is provided with a second concave part and a second flat part along the circumferential direction of the second guide rod, the shape of the second concave part is matched with that of a part of the second arc body, and the second flat part is close to the elastic piece relative to the second concave part; when the first swing arm and the second swing arm rotate relatively, the first concave part and the first flat part move around the axis of the first guide rod relative to the first arc body, and the second concave part and the second flat part move around the axis of the second guide rod relative to the second arc body; when the first swing arm and the second swing arm are in a flattened state or a folded state, the first arc-shaped body abuts against the first concave part, the second arc-shaped body abuts against the second concave part, and the compression amount of the elastic piece is a first compression amount; when the first swing arm and the second swing arm are in a bending state, the first arc body abuts against the first flat portion, the second arc body abuts against the second flat portion, the compression amount of the elastic piece is the second compression amount, the first compression amount is smaller than the second compression amount, and the bending state is a state between the flattening state and the folding state.

In one possible implementation, the first guide rod is fixedly connected with the first frame and the second frame, the first swing arm includes a first swing portion and a first swivel connected with the first swing portion, the first swivel is rotationally connected with the first guide rod, wherein: the first arc body is abutted against the annular end face of the first rotating ring, and the first concave part and the first flat part are arranged on the annular end face of the first rotating ring; or, a first arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the first swivel, the first arc-shaped body is propped against the first arc-shaped positioning boss, and the first concave part and the first flat part are arranged on the first arc-shaped positioning boss; the second guide arm is fixedly connected with the first frame and the second frame, the second swing arm comprises a second swing part and a second swivel connected with the second swing part, and the second swivel is rotationally connected with the second guide arm, wherein: the second arc body is abutted against the annular end face of the second rotating ring, and the second concave part and the second flat part are arranged on the annular end face of the second rotating ring; or, a second arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the second swivel, the second arc-shaped body is abutted against the second arc-shaped positioning boss, and the second concave part and the second flat part are arranged on the second arc-shaped positioning boss.

In one possible implementation manner, the first guide rod is rotationally connected with the first rack and the second rack, the first swing arm is fixedly connected with the first guide rod, a third arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the first guide rod, the first arc-shaped body is abutted against the third arc-shaped positioning boss, and the first concave part and the first flat part are arranged on the third arc-shaped positioning boss; the second guide rod is rotationally connected with the first frame and the second frame, the second swing arm is fixedly connected with the second guide rod, a fourth arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the second guide rod, the second arc-shaped body is propped against the fourth arc-shaped positioning boss, and the first concave part and the first flat part are arranged on the fourth arc-shaped positioning boss.

In a third aspect, an embodiment of the present application provides an electronic device, where the electronic device includes a flexible screen, two shells, and a folding mechanism according to the first or second aspect, where the two shells are fixedly connected to two swing arms of the folding mechanism, respectively, and the flexible screen is fixedly connected to the two shells.

In the technical scheme, the two swing arms can rotate under the action of external force, so that the switching between the unfolding state and the folding state is realized; when no external force acts, the elastic part in the compressed state provides elastic force to push the pushing part, so that the arc body installed on the pushing part is in contact with the swinging arm in an abutting mode, and the rolling friction force between the arc body and the swinging arm can prevent or limit the swinging arm from rotating, so that the swinging arm is fixed at a required position. Further, the swing arm is provided with the concave part and the flat part, in the folded state or the flattened state, the arc body is propped against the concave part, and when the swing arm is rotated to enable the arc body to be switched from propping against the concave part to propping against the flat part, larger external force is needed, so that the swing arms can be more accurately and reliably limited, and the two swing arms can be reliably positioned in the flattened state or the folded state without external force. Meanwhile, the folding mechanism is simple in structure and small in size, and is beneficial to reducing weight and cost.

Additional features and advantages of the application will be set forth in the detailed description which follows.

Drawings

The drawings that accompany the detailed description can be briefly described as follows.

FIG. 1 is a schematic diagram of a foldable electronic device;

fig. 2 is a schematic partial structure of a foldable electronic device according to an embodiment of the present application;

FIG. 3 is an enlarged view of portion A of the foldable electronic device shown in FIG. 2;

FIG. 4 is a schematic view of a folding mechanism according to a first embodiment of the present application in a flattened state;

FIG. 5 is an exploded view of the folding mechanism shown in FIG. 4;

FIG. 6 is a schematic view showing a folding mechanism according to a first embodiment of the present application in a folded state;

fig. 7 is a schematic structural view of a folding mechanism in a folded state according to a first embodiment of the present application;

FIG. 8 is a graph showing the compression of the elastic member when the folding mechanism of the first embodiment of the present application is in different positions;

FIG. 9 is a schematic view showing a folding mechanism in a critical position according to a first embodiment of the present application;

fig. 10 is a schematic structural view of a modification of the folding mechanism of the first embodiment of the present application;

fig. 11 is a force analysis chart of the roller movement process of the folding mechanism according to the first embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

In the description of the present application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or by an abutting or integral connection; the specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

Fig. 1 is a schematic structural diagram of a foldable electronic device. As shown in fig. 1, the electronic device includes a left middle frame 100, a right middle frame 200, a folding mechanism 300, a hinge back cover 400, and a screen 500. The folding mechanism 300 includes a rotation shaft 301, two swing arms 302 rotatably connected to the rotation shaft 301, and a limit structure (not shown in the drawings) for defining the positions of the two swing arms 302. The left middle frame 100 and the right middle frame 200 are respectively arranged on two sides of the rotating shaft 301 and are respectively fixedly connected with the two swinging arms 302, the screen 500 is fixedly connected with the left middle frame 100 and the right middle frame 200, the rotating shaft back cover 400 is covered at the rotating shaft 301, the rotating shaft back cover 400 and the screen 500 are positioned on two sides of the folding mechanism 300, and the rotating shaft back cover 400 is positioned on the side surfaces of the left middle frame 100 and the right middle frame 200 facing the rotating shaft 301. The left center frame 100 and the right center frame 200 are rotatable with the two swing arms 302 between a flattened state and a folded state. In the flattened state, the left center 100 and the right center 200 lie in the same plane, as shown in FIG. 1. In the folded state, the left middle frame 100 and the right middle frame 200 are folded in half, which is not shown in the figure.

In order to overcome the stress of inward folding of the screen, so that the whole screen is kept as flat as possible, in the flattened state, the folding mechanism 300 needs to provide a certain fixing force to effectively limit the left and right swing arms, so as to avoid the screen from being folded back due to the action of internal stress. In a small internal space of a foldable electronic device, how to design a folding mechanism with small size and high reliability becomes a difficult problem in the field.

In view of this, the embodiment of the application provides a folding mechanism and a foldable electronic device including the folding mechanism, so that the foldable electronic device applying the folding mechanism can realize the expansion of a screen in the expansion process, and a certain flattening force is provided in a flattened state to keep the screen in a plane, so that the limit is more reliable, the screen can be effectively prevented from being folded back due to the action of internal stress, and meanwhile, the folding mechanism has a simple structure and a smaller volume, and is beneficial to reducing the weight and the cost.

Fig. 2 is a schematic partial structure of a foldable electronic device according to an embodiment of the present application. Fig. 3 is an enlarged view of a portion a of the foldable electronic device shown in fig. 2. As shown in fig. 2 and 3, the foldable electronic device includes a flexible screen 1, a housing 21, a housing 22, and a folding mechanism 3, wherein the housing 21 and the housing 22 are respectively connected with two swing arms 20 of the folding mechanism 3, specifically, can be connected with the swing arms 20 through a connecting rod L, and the flexible screen 1 is fixedly connected with the housing 21 and the housing 22. The housing 21 may be a left middle frame, and the housing 22 may be a right middle frame. Also, when the flexible screen 1 is large in size, two or more folding mechanisms 3 may be provided.

The specific structure of the folding mechanism 3 in the foldable electronic device will be described below with reference to fig. 4 to 11.

Fig. 4 is a schematic structural view of a folding mechanism in a flattened state according to a first embodiment of the present application. Fig. 5 is an exploded view of the folding mechanism shown in fig. 4. As shown in fig. 4 and 5, the folding mechanism includes a first frame 10, a second frame 50, first and second guide rods 30 and 20 'disposed opposite to each other at a spaced apart position, a pushing member 40, first and second swing arms 20 and 20', and an elastic member. One end of the first guide bar 30 is fixedly connected with the first frame 10, and the other end of the first guide bar 30 is fixedly connected with the second frame 50. One end of the second guide rod is fixedly connected with the first frame 10, and the other end of the second guide rod is fixedly connected with the second frame 50. The pusher 40 includes a pusher block 401. The first end of the push block 401 is provided with a first hole H1 and the second end of the push block 401 is provided with a second hole H2. The first guide rod 30 is arranged at the first end of the push block 401 in a penetrating way through the first hole H1, and the second guide rod is arranged at the second end of the push block 401 in a penetrating way through the second hole H2. The elastic member is disposed between the pushing block 401 and the second frame 50 in a compressed manner, and can press the pushing member 40 toward the first frame 10 along the length direction of the guide rods 30 and 50. The elastic member may include a first spring S and a second spring S ', where the first spring S is sleeved on the first guide rod 30, and the second spring S' is sleeved on the second guide rod.

The pushing member 40 further includes a support body coupled to the pushing block 401, and a first arc body W and a second arc body W' provided on the support body. The support body may include a first support 402 and a second support 403. The first support 402 is connected to the push block 401 and protrudes toward the first frame 10 along the extending direction of the two guide rods 30. The second supporting member 403 is disposed on the first supporting member 402, and the extending direction of the second supporting member 403 is perpendicular to the extending direction of the two guide rods 30, the first arc W is disposed at one end of the second supporting member 403, and the second arc W is disposed at the other end of the second supporting member 403. In addition, the second supporting member 403 may be fixedly connected to the first supporting member 402, and at this time, the first arc W and the second arc W' are rotatably connected to two ends of the second supporting member 403, respectively. Alternatively, the second supporting member 403 is rotatably disposed on the first supporting member 402, and at this time, the first arc W and the second arc W' are fixedly connected to two ends of the second supporting member 403, respectively.

The first swing arm 20 is rotatably connected to the first guide bar 30 between the first frame 10 and the first end of the push block 401, the second swing arm 20' is rotatably connected to the second guide bar between the first frame 10 and the second end of the push block 401, the first arc W abuts against the first swing arm 20, and the second arc W ' abuts against the second swing arm 20'. The two swing arms 20, 20 'may be connected to the left and right middle frames of the foldable electronic device indirectly (e.g., via a link L) or directly, so that the left and right middle frames move together with the two swing arms 20, 20', thereby bending and flattening the screen.

The first swing arm 20 may rotate to drive the first arc W to rotate. The second swing arm 20 'may rotate to drive the second arc-shaped body W' to rotate. In this way, rolling friction is formed between the first swing arm 20 and the first arc W, rolling friction is formed between the second swing arm 20' and the second arc W ', and under the same conditions, rolling friction force is smaller than sliding friction force, so that the resistance moment to be overcome when the first swing arm 20 and the second swing arm 20' rotate is smaller, switching between a folded state and a flattened state is facilitated, and reliable limiting of the folded state and the flattened state is not affected. Further, the rotation axis of the first swing arm 20 may be perpendicular to the rotation axis of the first arc W; the rotation axis of the second swing arm 20 'may be perpendicular to the rotation axis of the second arc W'. In this way, the end surface of the first swing arm 20 is tangent to the outer periphery of the first arc body W, so that the first swing arm 20 can better drive the first arc body W to rotate when rotating, and the sliding friction between the first swing arm and the first arc body is reduced or avoided as much as possible. Similarly, the end face of the second swing arm 20' is tangent to the outer periphery of the second arc-shaped body W ', so that the second swing arm 20' can better drive the second arc-shaped body W to rotate when rotating, and sliding friction between the second swing arm and the second arc-shaped body W is reduced or avoided as much as possible.

Fig. 6 is a schematic structural view of a folding mechanism in a folded state according to the first embodiment of the present application. As shown in fig. 6, the first swing arm 20 is provided with two first recesses R1, R2 and a first flat portion P in the circumferential direction of the first guide bar 30, the first flat portion P being located between the two first recesses R1, R2, the first flat portion P being close to the elastic member, i.e., the spring S, S', with respect to the first recesses R1, R2. The shape of the first recesses R1, R2 matches the shape of a portion of the first arc W, which may comprise a roller or sphere or a portion of a roller or a portion of a sphere. The second swing arm 20' is provided with two second recesses R1', R2' and a second flat portion P ' in the circumferential direction of the second guide bar, the second flat portion P ' being located between the two second recesses R1', R2', the second flat portion P ' being close to the elastic member, i.e., the spring S, S ', with respect to the second recesses R1', R2 '. The shape of the second recesses R1', R2' matches the shape of a portion of the second arc W ', which may comprise a roller or sphere or a portion of a roller or a portion of a sphere. That is, the first and second arc bodies W and W ' may be complete rollers or complete spheres, or may be a part of a roller or a part of a sphere, as long as it is ensured that the surface of the first arc body W in contact with the first swing arm 20 is an arc surface and the surface of the second arc body W ' in contact with the second swing arm 20' is an arc surface when the two swing arms are rotated between the folded state and the unfolded state.

As shown in fig. 4 to 6, the first swing arm 20 includes a first swing portion 201 and a first rotating ring 202 connected to the first swing portion 201, and the first rotating ring 202 is rotatably connected to the first guide bar 30. A first arc-shaped positioning boss E protruding outward in the radial direction is provided on the outer peripheral wall of the first swivel 202, the first arc-shaped body W is provided against the first arc-shaped positioning boss E, and the first concave portions R1, R2 and the first flat portion P are provided in the first arc-shaped positioning boss E in the circumferential direction of the first arc-shaped positioning boss E. The second swing arm 20' includes a second swing portion 201' and a second swivel 202' connected to the second swing portion 201', the second swivel 202' being rotatably connected to the second guide bar. A second arc-shaped positioning boss E ' protruding outward in the radial direction is provided on the outer peripheral wall of the second swivel 202', the second arc-shaped body W ' being disposed against the second arc-shaped positioning boss E ', and the second concave portions R1', R2' and the second flat portion P ' being disposed on the second arc-shaped positioning boss E ' in the circumferential direction of the second arc-shaped positioning boss E '. That is, the first arc W is disposed against the first arc positioning boss E on the first swivel 202, and when the first swing arm 20 rotates around the first guide rod 30, the first flat portion P and the first concave portions R1, R2 on the first arc positioning boss E rotate around the first guide rod 30 together with the first swivel 202, so that the first arc W is switched from being against the first flat portion P to being against one of the two first concave portions R1, R2 or from being against one of the two first concave portions R1, R2 to being against the first flat portion P. Similarly, the second arc W 'is disposed against the second arc-shaped positioning boss E' on the second swivel 202', and when the second swing arm 20' rotates about the second guide rod, the second flat P 'and the second recesses R1', R2 'on the second arc-shaped positioning boss E' rotate about the second guide rod along with the second swivel 202', so that the second arc W' is switched from abutting the second flat P 'to abutting one of the two second recesses R1', R2 'or from abutting one of the two second recesses R1', R2 'to abutting the second flat P'.

Alternatively, when the first arc-shaped positioning boss E is not provided on the first conversion 202 and the second arc-shaped positioning boss E 'is not provided on the second swivel 202', the first arc-shaped body W may be disposed against the annular end face of the first swivel 202, and the first concave portions R1, R2 and the first flat portion P are disposed on the annular end face of the first swivel 202 in the circumferential direction of the annular end face. The second arc body W 'may be disposed against the annular end surface of the second swivel 202', and the second concave portions R1', R2' and the second flat portion P 'are disposed on the annular end surface of the second swivel 202' in the circumferential direction of the annular end surface. That is, the first arc W is disposed against the annular end face of the first swivel 202 of the first swing arm 20, and when the first swing arm 20 rotates around the first guide rod 30, the first flat portion P and the first concave portions R1, R2 on the annular end face of the first swivel 202 rotate around the first guide rod 30 together with the first swivel 202, so that the first arc W is switched from being against the first flat portion P to being against one of the two first concave portions R1, R2 or from being against one of the two first concave portions R1, R2 to being against the first flat portion P. Similarly, the second arc W 'is disposed against the annular end face of the second swivel 202' of the second swing arm 20', and when the second swing arm 20' rotates about the second guide rod, the second flat P 'and the second concave portions R1', R2 'on the annular end face of the second swivel 202' rotate about the second guide rod together with the second swivel 202', so that the second arc W' is switched from abutting against the second flat P 'to abutting against one of the two second concave portions R1', R2 'or from abutting against one of the two second concave portions R1', R2 'to abutting against the second flat P'.

When the first swing arm 20 and the second swing arm 20' are relatively rotated, the first concave portions R1, R2 and the first flat portion P move around the circumference of the first guide bar 30 with respect to the first arc body W, and the second concave portions R1', R2' and the second flat portion P ' move around the circumference of the second guide bar with respect to the second arc body W '. As shown in fig. 4, when the first arc W abuts against a first one of the two first recesses R1, R2, such as the first recess R1, and the second arc W ' abuts against a first one of the two second recesses R1', R2', such as the second recess R1', the two swing arms 20 are in a flattened state, and the compression amount of the elastic member, such as the spring S, S ', is the first compression amount X1. As shown in fig. 6, when the first arc W abuts against the second R2 of the two first recesses R1, R2 and the second arc W ' abuts against the second R2' of the two second recesses R1', R2', the two swing arms 20 are in a folded state therebetween, and the compression amount of the elastic member such as the spring S, S ' is the first compression amount X1.

Fig. 7 is a schematic structural view of a folding mechanism in a folded state according to a first embodiment of the present application. As shown in fig. 7, when the first swing arm 20 and the first swing arm 20 'are in a bending state, the first arc W abuts against the first flat portion P, the second arc W abuts against the second flat portion P', the end of the first support 402 of the pushing member 40 facing the first frame 10 is separated from the first frame 10, so that the pushing member 40 further compresses the elastic member, and under the restoring force of the compressed elastic member, the two rollers (arc W, W ') can always keep contact with the positioning boss E, E', so as to ensure that the rollers cannot slide relative to the positioning boss E, E ', so that the limit is more reliable, the compression amount of the elastic member such as the spring S, S' is the second compression amount X2, the first compression amount X1 is smaller than the second compression amount X2, and the bending state is a state between the flattened state and the folded state. In addition, if necessary, an additional first recess may be provided on the first flat portion P and an additional second recess may be provided on the second flat portion P ', so that when the first arc W abuts against the additional first recess and the second arc W ' abuts against the additional second recess, the two swing arms 20, 20' can be reliably positioned in the folded state, i.e., a position between the flattened position and the folded position.

It should be noted that, in the related drawings of the embodiments of the present application, the first arc W and the second arc W 'are exemplary rollers, and for convenience of description of the drawings, the rollers and the arcs are denoted by the same reference numerals, that is, the roller W represents a specific structure of the first arc, and the roller W' represents a specific structure of the second arc. The first recesses R1, R2 may be circular arc-shaped at this time, so that a portion of the roller W may be accommodated in the circular arc-shaped first recesses R1, R2, thereby reliably positioning the roller W. The second recesses R1', R2' may have a circular arc shape such that a portion of the roller W 'may be accommodated in the circular arc-shaped second recesses R1', R2 'to reliably position the roller W'.

Fig. 8 is a graph showing the compression amount of the elastic member when the folding mechanism of the first embodiment of the present application is at different positions. As shown in fig. 8, the original length of the elastic member such as the spring S or S' is L, and the compression amount of the elastic member means an amount shortened with respect to the original length. In the left side view of fig. 8, the compression amount of the spring S or S ' is X1, at which time the folding mechanism is in the flattened state as shown in fig. 4 (two rollers W, W ' are located in recesses R1, R1', respectively) or in the folded state as shown in fig. 6 (two rollers W, W ' are located in recesses R2, R2', respectively); in the right side view of fig. 8, the folding mechanism is in the folded state as shown in fig. 7, the two rollers W, W ' respectively abut against the flat portion P, P ', the compression amount of the spring S or S ' is X2, and X2 is greater than X1. That is, the spring S or S' is further compressed when the folding mechanism is in the folded state.

Fig. 9 is a schematic structural view of a folding mechanism in a critical position according to a first embodiment of the present application. As shown in fig. 9, the "critical position" here means that the roller W is located at a position where the first flat portion P is connected to the first concave portion R1 (or R2) and the roller W ' is located at a position where the second flat portion P ' is connected to the second concave portion R1' (or R2).

In addition, as shown in fig. 4 to 7 and 9, in order to prevent friction with the first frame 10 when the two swing arms are rotated, the folding mechanism of the first embodiment of the present application may further include a first spacer 60 and a second spacer 60'. The first spacer 60 is sleeved on the first guide rod 30 between the first frame 10 and the first swing arm 20, and the second spacer 60 'is sleeved on the second guide rod between the first frame 10 and the second swing arm 20'. The first frame 10 and the second frame 50 mainly play a role in fixing, and are fixed during rotation of the two swing arms 20. In this way, friction between the annular end surface of the first swivel 202 of the first swing arm 20 and the first frame 30 can be avoided when the first swing arm 20 rotates, and friction between the annular end surface of the second swivel 202' of the second swing arm 20' and the first frame can be avoided when the second swing arm 20' rotates. In addition, because the cross-sectional area of the gasket is smaller, the gasket is contacted with the annular end face of the swivel of the swing arm, so that friction between the gasket and the swivel is reduced, and the swing arm is easy to rotate.

Fig. 10 is a schematic structural view of a modification of the folding mechanism of the first embodiment of the present application. At this time, the folding mechanism is in a folded state, and is different from the folding mechanism shown in fig. 4 to 7 and 9 in that in the folding mechanism shown in fig. 10, the first spacer 60 is replaced with a first spring T and the second spacer 60 'is replaced with a second spring T'. That is, the folding mechanism may further include a third spring T and a fourth spring T ', wherein the third spring T is sleeved on the first guide rod 30 between the first frame 10 and the first swing arm 20, and the fourth spring T ' is sleeved on the second guide rod between the first frame 10 and the second swing arm 20 '. Wherein the third and fourth springs T and T 'function similarly to the first and second shims 60 and 60'.

The stress condition of the roller W during the movement is analyzed below. Rolling friction is arranged between the roller W and the positioning boss E. In practice, the position of the roller W is unchanged, and the position of the positioning boss E is changed, but for convenience in carrying out the force analysis, it is assumed that the position of the positioning boss E is unchanged, and the roller W rolls along the positioning boss E.

Fig. 11 is a force analysis chart of the roller movement process of the folding mechanism according to the first embodiment of the present application. As shown in fig. 11, since the direction of gravity and the direction of elastic force are determined, in order to simplify the stress condition of the roller W, the gravity and the elastic force are combined into F, and since the roller W always abuts against the positioning boss E of the swing arm 20, it can be known that the F direction is directed toward the positioning boss E. The stress condition can be equivalent to that the roller W with the gravity of F rolls along the positioning boss E.

In fig. 11, Q is an external force, f is a friction force, N is a supporting force for positioning the boss E, E is an offset of N under the action of the external force, and O is an instant center. The external force Q can cause the roller W to rotate, i.e., roll, about the O-point. The position of the instant center O is continuously changed along the contact surface during the rolling process, so that the roller W and the positioning boss E generate relative movement. At this time, the moment of N, f to the O point is zero. Thus, they are neither the power nor the resistance to rolling. Only the moment of F to O point is opposite to the primary moment q×h (see fig. 11-1). Therefore, F×e is the rolling resistance moment.

When the swing arm 20 is in the flattened state, the roller W is located at the first recess R1 as shown in fig. 11-1, and when the swing arm 20 is in the bent state, the roller W is located at the flat portion as shown in fig. 11-2 and 11-3. Since the gravity is always unchanged and the spring force of the bending state spring S is large, the F' in the bending state is larger than the F in the flattened state. When the roller W moves from the first recess R1 to the flat portion, e at the first recess R1 is much larger than e of the roller in the bent state, and a large external force Q is required to overcome the large rolling resistance moment fxe when the roller W rolls out of the first recess R1, so that it is advantageous to prevent the roller W from rolling out of the first recess R1. The roller W rolls out of the second recess R2 similarly to the roller W rolls out of the first recess R1.

When the swing arm 20 is in the folded state, the roller W is located at the second recess R2, as shown in fig. 11-4, since the gravity is always unchanged, and the compression amount of the spring S is the same in the folded state and the flattened state, the force F applied to the roller W is equal in the folded state and the flattened state, and the F' in the folded state is greater than the F in the folded state. When the roller W moves from the flat portion to the second recess R2, at the flat portion, as shown in fig. 11-3, F 'is collinear with N, F' xe is zero, the absolute value of-e gradually increases beyond the collinear point, and the absolute value of-F xe increases together, at which time the roller W can roll to the second recess R2 by itself even without the action of the external force Q, thus facilitating the rolling of the roller W into the second recess R2. The roller W rolls into the first recess R1 similarly to the second recess R2.

The resistance moment for limiting the rotation of the swinging arm 20 is equal to the resistance moment for limiting the rotation of the roller W (moment of F to O point), the directions are opposite, the resistance moment for limiting the rotation of the swinging arm 20 is positively related to F (namely, the resultant force of the spring force provided by the spring S and the gravity of the roller W), the force is applied to the swinging arm 20 through the roller W, the swinging arm 20 is limited to rotate when the screen is flattened, and further accurate limiting of the left middle frame and the right middle frame of the foldable electronic equipment is realized, and the screen is ensured not to be folded back.

The second embodiment of the present application also provides a folding mechanism comprising a first frame 10 and a second frame 50, a first guide bar 30 and a second guide bar 30 'arranged at opposite intervals, a pushing member 40, a first swing arm 20 and a second swing arm 20', and an elastic member. One end of the first guide rod 30 is connected with the first frame 10, and the other end of the first guide rod 30 is connected with the second frame 50; one end of the second guide bar 30 'is connected to the first frame 10, and the other end of the second guide bar 30' is connected to the second frame 50. The pushing piece 40 comprises a pushing block 401, a supporting body connected with the pushing block 401, and a first arc-shaped body W and a second arc-shaped body W' which are arranged on the supporting body, wherein a first hole H1 is formed in the first end of the pushing block 401, a second hole H2 is formed in the second end of the pushing block 401, a first guide rod 30 penetrates through the first hole H1 to be arranged at the first end of the pushing block 401, and a second guide rod penetrates through the second hole H2 to be arranged at the second end of the pushing block 401. The first swing arm 20 is connected with the first guide bar 30 between the first frame 10 and the first end of the push block 401, the second swing arm 20' is connected with the second guide bar between the first frame 10 and the second end of the push block 401, the first arc W abuts against one of the first swing arm 20 and the first guide bar 30, and the second arc W ' abuts against one of the second swing arm 20' and the second guide bar. An elastic member such as a spring S, S' is compressively disposed between the push block 401 and the second housing 50; one of the first swing arm 20 and the first guide bar 30 is provided with first concave portions R1, R2 and a first flat portion P in the circumferential direction of the first guide bar 30, the shape of the first concave portions R1, R2 matching the shape of a part of the first arc body W, the first flat portion P being close to the elastic member with respect to the first concave portions R1, R2. One of the second swing arm 20 'and the second guide bar 30' is provided with second recesses R1', R2' and a second flat portion P 'in the circumferential direction of the second guide bar 30', the shape of the second recesses R1', R2' matching the shape of a portion of the second arc body W ', the second flat portion P' being close to the elastic member with respect to the second recesses R1', R2'; when the first swing arm 20 and the second swing arm 20 'are relatively rotated, the first concave portions R1, R2 and the first flat portion P move about the axis of the first guide bar 30 with respect to the first arc body W, and the second concave portions R1', R2 'and the second flat portion P' move about the axis of the second guide bar 30 'with respect to the second arc body W'; when the first swing arm 20 and the second swing arm 20 'are in a flattened state, the first arc W abuts against the first concave portion R1, the second arc W' abuts against the second concave portion R1', and when the first swing arm 20 and the second swing arm 20' are in a folded state, the first arc W abuts against the first concave portion R2, the second arc W 'abuts against the second concave portion R2', and the compression amount of the elastic member is the first compression amount; when the first swing arm 20 and the second swing arm 20' are in a bent state, the first arc W abuts against the first flat portion P, the second arc W ' abuts against the second flat portion P ', the compression amount of the elastic member is a second compression amount, the first compression amount is smaller than the second compression amount, and the bent state is a state between the flattened state and the folded state.

In one possible implementation, the first guide bar 30 is fixedly connected to the first frame 10 and the second frame 50, and the first swing arm 20 includes a first swing portion 201 and a first rotating ring 202 connected to the first swing portion 201, where the first rotating ring 202 is rotatably connected to the first guide bar 30. The first arc W is disposed against the annular end face of the first swivel 202, and the first concave portions R1, R2 and the first flat portion P are disposed on the annular end face of the first swivel 202. Alternatively, a first arc-shaped positioning boss E protruding outward in the radial direction is provided on the outer peripheral wall of the first swivel 202, the first arc-shaped body being provided against the first arc-shaped positioning boss E, and the first concave portions R1, R2 and the first flat portion P being provided on the first arc-shaped positioning boss E. The second guide bar is fixedly connected with the first frame 10 and the second frame 50, and the second swing arm 20' includes a second swing portion 201' and a second swivel 202' connected with the second swing portion 201', and the second swivel 202' is rotatably connected with the second guide bar. The second arc W 'is disposed against the annular end face of the second swivel 202', and the second concave portions R1', R2' and the second flat portion P 'are disposed on the annular end face of the second swivel 202'. Alternatively, a second arc-shaped positioning boss E 'protruding outward in the radial direction is provided on the outer peripheral wall of the second swivel 202', and the second arc-shaped body W 'is disposed against the second arc-shaped positioning boss E', and the second concave portions R1', R2' and the second flat portion P 'are disposed on the second arc-shaped positioning boss E'.

The relevant structure in this implementation may be described with reference to the relevant description in the folding mechanism of the first embodiment.

In another possible implementation manner, the first guide rod 30 is rotatably connected with the first frame 10 and the second frame 50, the first swing arm 20 is fixedly connected with the first guide rod 30, a third arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the first guide rod 30, the first arc-shaped body W is arranged against the third arc-shaped positioning boss, and the first concave parts R1, R2 and the first flat part P are arranged on the third arc-shaped positioning boss; the second guide rod 30' is rotatably connected with the first frame 10 and the second frame 50, the second swing arm 20' is fixedly connected with the second guide rod 30', a fourth arc-shaped positioning boss protruding outwards along the radial direction is arranged on the peripheral wall of the second guide rod 30', the second arc-shaped body W ' is abutted against the fourth arc-shaped positioning boss, and the first concave parts R1 and R2 and the first flat part P are arranged on the fourth arc-shaped positioning boss.

That is, in this embodiment, the two guide bars 30, 30 'are rotatably connected to the first frame 10 and the second frame 50, the first swing arm 20 is fixedly connected to the guide bar 30, the second swing arm 20' is fixedly connected to the guide bar 30', arc-shaped positioning bosses protruding outward in the radial direction are respectively provided on outer circumferential walls of the guide bars 30, 30', and the arc-shaped bodies W, W 'are respectively disposed against the arc-shaped positioning bosses on the guide bars 30, 30'.

In summary, according to the folding mechanism of the embodiment of the present application, the two swing arms can be unfolded and folded under the action of the external force, and when no external force acts, the pushing member is pushed by the elastic force provided by the elastic member in the compressed state, so that the arc body mounted on the pushing member, such as the roller, is in abutting contact with the positioning boss or the annular end surface of the swivel, to limit the rotation of the two swing arms, thereby fixing the swing arms at the desired position. Further, a concave part for accommodating the roller is formed in the annular end face of the positioning boss or the swivel, when the two swing arms are in a flattened state or a folded state, the roller abuts against the concave part, and larger external force is required when the roller rolls out of the concave part, so that the two swing arms can be more accurately and reliably limited in the flattened state or the folded state. Meanwhile, the folding mechanism is simple in structure and small in size, and is beneficial to reducing weight and cost.

The foldable electronic device requires additional flattening force in the flattened state to overcome the problem of kinking due to the action of the internal stress of the screen. The electronic equipment of the folding mechanism of the embodiment of the application ensures that the roller on the pushing piece is always contacted with the two swing arms through the elasticity provided by the elastic piece, can be normally unfolded and folded under the action of external force, and can limit the rotation of the swing arms through the friction resistance between the roller on the pushing piece and the positioning boss or the annular end face of the swivel under the action of no external force, so that the swing arms can be fixed at required positions, and can provide enough flattening force to keep the screen as a plane in the flattening state, thereby realizing the accurate limitation of the left and right middle frames, ensuring that the screen can not be folded back in the flattening state, being reliable in limitation, simple in structure and small in volume, and being beneficial to reducing weight and cost.

The last explanation is: the above embodiments are only for illustrating the technical solution of the present application, but are not limited thereto; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A folding mechanism, comprising:

a first chassis (10) and a second chassis (50);

the first guide rod (30) and the second guide rod (30') are oppositely arranged at intervals, one end of the first guide rod (30) is fixedly connected with the first rack (10), and the other end of the first guide rod (30) is fixedly connected with the second rack (50); one end of the second guide rod (30 ') is fixedly connected with the first rack (10), and the other end of the second guide rod (30') is fixedly connected with the second rack (50);

the pushing piece (40) comprises a pushing block (401), a supporting body connected with the pushing block (401), and a first arc body (W) and a second arc body (W ') which are arranged on the supporting body, wherein a first hole (H1) is formed in the first end of the pushing block (401), a second hole (H2) is formed in the second end of the pushing block (401), the first guide rod (30) penetrates through the first hole (H1) to be arranged at the first end of the pushing block (401), and the second guide rod (30') penetrates through the second hole (H2) to be arranged at the second end of the pushing block (401);

A first swing arm (20) and a second swing arm (20 '), the first swing arm (20) being rotatably connected with the first guide rod (30) between the first frame (10) and the first end of the push block (401), the second swing arm (20') being rotatably connected with the second guide rod (30 ') between the first frame (10) and the second end of the push block (401), the first arc (W) abutting the first swing arm (20), the second arc (W) abutting the second swing arm (20');

an elastic member (S, S') compressed between the push block (401) and the second frame (50);

a first concave portion (R1, R2) and a first flat portion (P) are arranged on the first swing arm (20) along the circumferential direction of the first guide rod (30), the shape of the first concave portion (R1, R2) is matched with that of a part of the first arc body (W), and the first flat portion (P) is close to the elastic piece (S, S') relative to the first concave portion (R1, R2); -the second swing arm (20 ') is provided with a second recess (R1 ', R2 ') in the circumferential direction of the second guide bar (30 '), the shape of the second recess (R1 ', R2 ') matching the shape of a portion of the second arc body (W '), and a second flat portion (P ') being close to the elastic member (S, S ') with respect to the second recess (R1 ', R2 ');

When the first swing arm (20) and the second swing arm (20 ') are relatively rotated, the first concave portions (R1, R2) and the first flat portion (P) move around the circumference of the first guide bar (30) with respect to the first arc body (W), and the second concave portions (R1', R2 ') and the second flat portion (P') move around the circumference of the second guide bar (30 ') with respect to the second arc body (W');

when the first swing arm (20) and the second swing arm (20 ') are in a flattened state or a folded state, the first arc body (W) is abutted against the first concave portions (R1, R2), the second arc body (W') is abutted against the second concave portions (R1 ', R2'), and the compression amount of the elastic member is a first compression amount;

when the first swing arm (20) and the second swing arm (20 ') are in a bending state, the first arc body (W) abuts against the first flat portion (P), the second arc body (W') abuts against the second flat portion (P '), the compression amount of the elastic member (S, S') is a second compression amount, the first compression amount is smaller than the second compression amount, and the bending state is a state between the flattened state and the folded state.

2. Folding mechanism according to claim 1, characterized in that the first oscillating arm (20) rotates, driving the first arc (W) in rotation; the second swing arm (20 ') drives the second arc body (W') to rotate when rotating.

3. Folding mechanism according to claim 2, characterized in that the rotation axis of the first swing arm (20) is perpendicular to the rotation axis of the first arc (W); the axis of rotation of the second swing arm (20 ') is perpendicular to the axis of rotation of the second arc (W').

4. Folding mechanism according to claim 1, characterized in that the first arc (W) and the second arc (W') comprise a roller or a sphere or a partial roller or a partial sphere, respectively.

5. The folding mechanism of claim 1, wherein the support comprises:

a first support member (402) connected to the push block (401) and extending toward the first frame (10) along the extending direction of the first guide bar (30) and the second guide bar (30');

the second support piece (403) is arranged on the first support piece (402), the extending direction of the second support piece (403) is perpendicular to the extending directions of the first guide rod (30) and the second guide rod (30 '), the first arc body (W) is arranged at one end of the second support piece (403), and the second arc body (W') is arranged at the other end of the second support piece (403).

6. The folding mechanism of claim 5, wherein:

The second supporting piece (403) is fixedly connected with the first supporting piece (402), and the first arc body (W) and the second arc body (W') are respectively and rotatably connected with two ends of the second supporting piece (403); or alternatively, the first and second heat exchangers may be,

the second supporting piece (403) is rotatably arranged on the first supporting piece (402), and the first arc body (W) and the second arc body (W') are fixedly connected with two ends of the second supporting piece (403) respectively.

7. The folding mechanism according to claim 1, wherein the elastic member (S, S ') includes a first spring (S) and a second spring (S'), the first spring (S) is sleeved on the first guide rod (30), and the second spring (S ') is sleeved on the second guide rod (30').

8. The folding mechanism of claim 1, wherein:

the first swing arm (20) comprises a first swing part (201) and a first swivel (202) connected with the first swing part (201), the first swivel (202) is rotationally connected with the first guide rod (30), wherein: the first arc body (W) is arranged against the annular end face of the first swivel (202), and the first concave parts (R1, R2) and the first flat part (P) are arranged on the annular end face of the first swivel (202); or, a first arc-shaped positioning boss (E) protruding outwards along the radial direction is arranged on the peripheral wall of the first rotating ring (202), the first arc-shaped body is abutted against the first arc-shaped positioning boss (E), and the first concave parts (R1, R2) and the first flat part (P) are arranged on the first arc-shaped positioning boss (E);

The second swing arm (20 ') comprises a second swing portion (201') and a second swivel (202 ') connected to the second swing portion (201'), the second swivel (202 ') being rotatably connected to the second guide bar (30'), wherein: the second arc body (W ') is arranged against the annular end face of the second swivel (202'), and the second recess (R1 ', R2') and the second flat portion (P ') are arranged on the annular end face of the second swivel (202'); or, a second arc-shaped positioning boss (E ') protruding outwards in the radial direction is arranged on the outer peripheral wall of the second swivel (202'), the second arc-shaped body (W ') is arranged against the second arc-shaped positioning boss (E'), and the second concave parts (R1 ', R2') and the second flat part (P ') are arranged on the second arc-shaped positioning boss (E').

9. The folding mechanism of claim 1, wherein:

the first swing arm (20) is provided with two first concave parts (R1, R2), the first flat part (P) is positioned between the two first concave parts (R1, R2), the second swing arm (20 ') is provided with two second concave parts (R1', R2 '), and the second flat part (P') is positioned between the two second concave parts (R1 ', R2');

When the first arc body (W) abuts against a first one (R1) of the two first recesses (R1, R2) and the second arc body (W ') abuts against a first one (R1 ') of the two second recesses (R1 ', R2 '), the first swing arm (20) and the second swing arm (20 ') are in the flattened state;

when the first arc body (W) abuts against a second (R2) of the two first recesses (R1, R2) and the second arc body (W ') abuts against a second (R2) of the two second recesses (R1', R2 '), the first swing arm (20) and the second swing arm (20') are in the folded state therebetween.

10. The folding mechanism of any one of claims 1-9, further comprising:

the first gasket (60) and the second gasket (60 '), wherein the first gasket (60) is sleeved on the first guide rod (30) between the first frame (10) and the first swing arm (20), and the second gasket (60') is sleeved on the second guide rod (30 ') between the first frame (10) and the second swing arm (20'); or alternatively, the first and second heat exchangers may be,

the third spring (T) is sleeved between the first rack (10) and the first swing arm (20) and is arranged on the first guide rod (30), and the fourth spring (T ') is sleeved between the first rack (10) and the second swing arm (20 ') and is arranged on the second guide rod (30 ').

11. A folding mechanism, comprising:

a first chassis (10) and a second chassis (50);

the first guide rod (30) and the second guide rod (30') are oppositely arranged at intervals, one end of the first guide rod (30) is connected with the first rack (10), and the other end of the first guide rod (30) is connected with the second rack (50); one end of the second guide rod (30 ') is connected with the first rack (10), and the other end of the second guide rod (30') is connected with the second rack (50);

-a first swing arm (20) and a second swing arm (20 '), the first swing arm (20) being connected with the first guide bar (30) between the first frame (10) and a first end of the push block (401), the second swing arm (20 ') being connected with the second guide bar (30 ') between the first frame (10) and a second end of the push block (401), the first arc (W) being against one of the first swing arm (20) and the first guide bar (30), the second arc (W) being against one of the second swing arm (20 ') and the second guide bar (30 ');

-one of the first swing arm (20) and the first guide rod (30) is provided with a first recess (R1, R2) and a first flat portion (P) in the circumferential direction of the first guide rod (30), the shape of the first recess (R1, R2) matching the shape of a portion of the first arc body (W), the first flat portion (P) being close to the elastic member (S, S') with respect to the first recess (R1, R2); -one of the second swing arm (20 ') and the second guide rod (30 ') is provided with a second recess (R1 ', R2 ') and a second flat portion (P ') in a circumferential direction of the second guide rod (30 '), the shape of the second recess (R1 ', R2 ') matching the shape of a portion of the second arc body (W '), the second flat portion (P ') being close to the elastic member (S, S ') with respect to the second recess (R1 ', R2 ');

when the first swing arm (20) and the second swing arm (20 ') are rotated relative to each other, the first concave portion (R1, R2) and the first flat portion (P) move relative to the first arc body (W) about the axis of the first guide rod (30), and the second concave portion (R1', R2 ') and the second flat portion (P') move relative to the second arc body (W ') about the axis of the second guide rod (30');

12. The folding mechanism of claim 11, wherein the first guide bar (30) is fixedly connected to the first frame (10) and the second frame (50), the first swing arm (20) comprises a first swing portion (201) and a first swivel (202) connected to the first swing portion (201), the first swivel (202) is rotatably connected to the first guide bar (30), wherein: the first arc body (W) is arranged against the annular end face of the first swivel (202), and the first concave parts (R1, R2) and the first flat part (P) are arranged on the annular end face of the first swivel (202); or, a first arc-shaped positioning boss (E) protruding outwards along the radial direction is arranged on the peripheral wall of the first rotating ring (202), the first arc-shaped body is abutted against the first arc-shaped positioning boss (E), and the first concave parts (R1, R2) and the first flat part (P) are arranged on the first arc-shaped positioning boss (E);

The second guide rod (30 ') is fixedly connected with the first frame (10) and the second frame (50), the second swing arm (20 ') comprises a second swing part (201 ') and a second swivel (202 ') connected with the second swing part (201 '), and the second swivel (202 ') is rotationally connected with the second guide rod (30 '), wherein: the second arc body (W ') is arranged against the annular end face of the second swivel (202'), and the second recess (R1 ', R2') and the second flat portion (P ') are arranged on the annular end face of the second swivel (202'); or, a second arc-shaped positioning boss (E ') protruding outwards in the radial direction is arranged on the outer peripheral wall of the second swivel (202'), the second arc-shaped body (W ') is arranged against the second arc-shaped positioning boss (E'), and the second concave parts (R1 ', R2') and the second flat part (P ') are arranged on the second arc-shaped positioning boss (E').

13. The folding mechanism according to claim 11, characterized in that the first guide bar (30) is rotatably connected to the first frame (10) and the second frame (50), the first swing arm (20) is fixedly connected to the first guide bar (30), a third arc-shaped positioning boss protruding outwards in the radial direction is provided on the outer peripheral wall of the first guide bar (30), the first arc-shaped body (W) is provided against the third arc-shaped positioning boss, and the first concave portions (R1, R2) and the first flat portion (P) are provided on the third arc-shaped positioning boss;

The second guide rod (30 ') is rotationally connected with the first rack (10) and the second rack (50), the second swing arm (20 ') is fixedly connected with the second guide rod (30 '), a fourth arc-shaped positioning boss protruding outwards in the radial direction is arranged on the peripheral wall of the second guide rod (30 '), the second arc-shaped body (W ') is propped against the fourth arc-shaped positioning boss, and the first concave parts (R1, R2) and the first flat part (P) are arranged on the fourth arc-shaped positioning boss.

14. Electronic device, characterized in that it comprises a flexible screen (1), two housings (21, 22) and a folding mechanism (3) according to any one of claims 1-13, said two housings (21, 22) being respectively fixedly connected to two oscillating arms (20, 20') of said folding mechanism (3), said flexible screen (1) being fixedly connected to said two housings (21, 22).