WO2024146310A1 - Rotating shaft mechanism and electronic device - Google Patents

Abstract

A rotating shaft mechanism and an electronic device. The rotating shaft mechanism comprises a rotating shaft base (3), a sliding part (10), an elastic element, a first damping swing arm (101), a second damping swing arm (102), a first pin shaft (121) and a second pin shaft (122). The sliding part is arranged in a sliding manner in a direction parallel to an axis, the first damping swing arm and the second damping swing arm are provided with spiral grooves, protruding parts are arranged on two sides of the central axis of the sliding part, and the spiral grooves and the protruding parts are in sliding fit so as to realize synchronous rotation of the first damping swing arm and the second damping swing arm, wherein under the action of the elastic element, the protruding parts are always in close fit with the spiral grooves, thereby improving the rotational synchronicity of the first damping swing arm and the second damping swing arm. The rotating shaft mechanism can be applied to a mobile phone, a tablet computer, a tablet accessory, a wearable device and other electronic devices, thereby further reducing the size of a synchronization mechanism under the requirements for a small-sized component such as a foldable screen, thus decreasing the number of parts, and also achieving stable synchronous transmission and small virtual displacement.

Description

A rotating shaft mechanism and electronic equipment

This application claims the priority of the Chinese patent application filed with the China Patent Office on January 6, 2023, with application number 202310020527.X and application name “A rotating shaft mechanism and electronic device”, the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of electronic products, and in particular to a rotating shaft mechanism and an electronic device.

Background technique

With the development of flexible screen technology, flexible screens are increasingly used in electronic devices, especially foldable electronic devices. At present, in order to achieve synchronous rotation during folding or unfolding, foldable electronic devices usually use a gear rotation mechanism. The swing arms at both ends of the rotation mechanism are equipped with gears, which are respectively meshed with two mutually meshing small gears in the middle, thereby achieving synchronous movement of the swing arms at both ends of the shaft. However, as folding machines gradually become thinner and lighter, the space reserved for the shaft is constantly decreasing. At present, in order to ensure the strength of the meshing teeth, the gears cannot be significantly reduced in size, and the traditional gear rotation mechanism can no longer meet the current synchronization requirements of the shaft.

Summary of the invention

The present application provides a hinge mechanism and an electronic device, wherein the hinge mechanism includes a hinge base and a rotating mechanism, wherein the rotating mechanism realizes the rotation of the swing arm on one side of the sliding member through the spiral cooperation between the sliding member and the first swing arm and the second swing arm, driving the swing arm on the other side to move relative or toward each other, thereby realizing the synchronous rotation of the middle frame driven by the swing arm.

On the one hand, an embodiment of the present application provides a rotation mechanism, which is used to make the rotation angles of the middle frames on both sides of the rotating shaft mechanism relative to the integral base of the rotating shaft of the rotating shaft mechanism close to the same effect during the folding and unfolding process of the rotating shaft mechanism. The rotating mechanism includes a sliding member, and a first swing arm and a second swing arm located on both sides of the sliding member, the first swing arm and the second swing arm are respectively used to connect the middle frames on both sides, and the first swing arm and the second swing arm both rotate relative to the integral base of the rotating shaft;

The sliding member is provided with a sliding constraint along an axis direction parallel to the rotation axis of the first swing arm and the second swing arm; the first swing arm and the second swing arm are split structures, the first swing arm includes a first damping swing arm and a first synchronous swing arm, the second swing arm includes a second damping swing arm and a second synchronous swing arm, the first damping swing arm and the first synchronous swing arm and the second damping swing arm and the second synchronous swing arm are connected by a pin groove structure and a buckle structure, the first swing arm and the second swing arm are respectively provided with a first groove and a second groove, the sliding member is respectively provided with a first protrusion and a second protrusion on both sides of the central axis, the first protrusion The two end surfaces of the second protrusion along the axial direction both have a first spiral bevel and a second spiral bevel, the two groove sides of the first groove and the second groove along the axial direction are both provided with three spiral bevels and a fourth spiral bevel, the third spiral bevel cooperates with the first spiral bevel, the fourth spiral bevel cooperates with the second spiral bevel, the first swing arm rotates from position one to position two around the first pin shaft in a direction perpendicular to the first pin shaft, the first protrusion slides in cooperation with the first groove, and the sliding member drives the second protrusion slides in cooperation with the second groove, so that the second swing arm rotates from position one to position two around the second pin shaft in a direction perpendicular to the second pin shaft.

The rotating mechanism of the embodiment of the present application is provided with a sliding part, and the first protrusion is connected with the first damping swing arm and the first synchronous swing arm to form the first groove, and the second protrusion cooperates with the second damping swing arm and the second synchronous swing arm to form the second groove, so as to realize the synchronous rotation of the first swing arm and the first swing arm. The size of the rotating mechanism is further reduced and the number of parts is simplified under the small size requirements of electronic equipment such as folding screens. At the same time, the synchronous transmission is stable and the dead space is small.

Based on one aspect, in a possible implementation, the first swing arm rotates around the first pin, the second swing arm rotates around the second pin, and the sliding member is slidably arranged along the first pin and the second pin. The sliding member slides along the pins of the first swing arm and the second swing arm, so the sliding member does not need to add other sliding constraints, further reducing the number of parts, and also It can reduce the synchronization virtual position.

In another possible implementation, the first protrusion and the second protrusion are respectively formed with pin holes, and the pin holes form a sliding constraint. The first pin shaft and the second pin shaft respectively pass through the pin holes to form a sliding constraint. The structural setting is simple, and the sliding fit is stable and reliable.

In another possible implementation, the centers of the first protrusion and the second protrusion in the thickness direction are located at the same height as the centers of the first swing arm and the second swing arm. In this way, when the first swing arm and the second swing arm rotate, the forces applied to the sliding member are symmetrical and equal, thereby reducing the risk of the sliding member getting stuck, and also making the hand feel force substantially symmetrical during forward and reverse rotation, thereby improving user experience.

In another possible implementation, the first damping swing arm and the second damping swing arm are both provided with a second sleeve, a third sleeve, and a fourth sleeve on the side facing the pin shaft, and the first synchronous swing arm and the second synchronous swing arm are both provided with a fifth sleeve. The first groove and the second groove are formed axially along the spiral inclined surface set along the fourth sleeve close to one end of the fifth sleeve and the spiral inclined surface set along the fifth sleeve close to the fourth sleeve. The first pin shaft and the second pin shaft respectively pass through the corresponding second sleeve, the third sleeve, the fourth sleeve, the pin hole and the fifth sleeve, so that the space can be fully utilized and the structure can be simplified.

In another possible implementation, the widths of the first protrusion and the second protrusion are substantially equal to the widths of the first groove and the second groove along the axial direction, and the widths of the first groove and the second groove along the axial direction are slightly larger than the widths of the first protrusion and the second protrusion along the axial direction, so as to ensure that the two can always interact with each other without interfering with their relative movement.

In another possible implementation, the rotating mechanism further includes a sliding member base, the sliding member base is arranged on the rotating shaft base, the sliding member slides on the sliding member base, and the sliding member base is provided with a seventh sleeve and a sixth sleeve on both sides of the two ends in the axial direction, respectively. An accommodation space is formed between the third sleeve and the fourth sleeve on the first damping swing arm and the second damping swing arm, the seventh sleeve is placed in the accommodation space, and the first pin shaft and the second pin shaft are inserted into the sixth sleeve and the seventh sleeve on the corresponding side. The installation of the first pin shaft and the second pin shaft is achieved through the sleeve structure, and the space where the pin shaft is located is shared with the second sleeve, the third sleeve, the fourth sleeve, the pin hole, and the fifth sleeve, which is conducive to a compact structure.

In another possible implementation, the sliding member and the sliding member base are slidably matched along the axis direction. The matching between the sliding member and the sliding member base is conducive to further ensuring stable and reliable sliding.

In another possible implementation, the rotating mechanism further includes a spring base, a first elastic member and a cam base, the elastic member base is fixedly arranged on the rotating shaft base, the first elastic member and the second elastic member are pre-pressed and installed between the elastic member base and the cam base, and the cam base is in abutment with the first damping swing arm and the second damping swing arm. The elastic member base is symmetrically provided with first sleeves on both sides of the central axis; the cam base is symmetrically provided with cams on both sides of the central axis; one end of the first elastic member and the second elastic member are respectively in abutment with the first sleeve on the corresponding side, and the other end of the first elastic member and the second elastic member are respectively in abutment with the cam; the two cams are in abutment with the two second sleeves on the corresponding side. The first pin and the second pin are respectively inserted into the two first sleeves and the two cams on the corresponding side, the first pin passes through the first elastic member, and the second pin passes through the second elastic member. The cam has a first concave-convex surface on one end surface facing the second sleeve, and the second sleeve has a second concave-convex surface on one end surface facing the cam. The first concave-convex surface corresponds to the second concave-convex surface. When the first swing arm and the second swing arm rotate, the first concave-convex surface rotates relative to the second concave-convex surface to provide damping. The first elastic member and the first swing arm share a first pin shaft, and the second elastic member and the second swing arm share a second pin shaft. The first elastic member and the second elastic member are mortgaged to press the cams on the corresponding sides respectively, so that the two cams press the first damping swing arm and the second damping swing arm respectively.

The first protrusion is tightly matched with the first groove, and the second protrusion is tightly matched with the second groove.

In another possible implementation, the spring is in a pre-stressed state, and the end surface of the cam facing the second sleeve has a A concave-convex surface, the second sleeve has a second concave-convex surface on one end surface facing the cam, the first concave-convex surface corresponds to the second concave-convex surface one by one, the first swing arm and the second swing arm rotate, and the first concave-convex surface rotates relative to the second concave-convex surface to provide damping, thereby improving the user experience.

In another possible implementation, when the sliding part is worn, the axial force provided by the first elastic part and the second elastic part can push the first damping swing arm and the second damping swing arm to move axially, so that the first damping swing arm and the second damping swing arm are always in a fit state with the first protrusion and the second protrusion, thereby compensating for the gap caused by the wear of the sliding part and improving the synchronization accuracy of the rotating shaft.

In a second aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: the electronic device comprises a first middle frame, a second middle frame, a flexible screen and the rotating mechanism as described above;

The first middle frame is connected to the first damping swing arm and the first synchronous swing arm in the rotating mechanism, and the second middle frame is connected to the second damping swing arm and the second synchronous swing arm in the rotating mechanism respectively;

The flexible screen covers the first middle frame and the second middle frame.

In a possible implementation, the electronic device further includes a rotating shaft base, and the rotating mechanism, the damping swing arm, and the synchronous swing arm are all arranged on the rotating shaft base.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of an electronic device deployed in an embodiment of the present application;

FIG2 is a schematic diagram of the cooperation between the rotating mechanism and the rotating shaft base in FIG1 ;

FIG3 is an enlarged view of the circled position in FIG2 ;

FIG4 is an exploded view of the rotating mechanism in FIG3 ;

FIG5 is a schematic diagram of the cooperation of the sliding member, the swing arm and the pin in FIG4 ;

FIG6 is a schematic diagram of a first swing arm and a second swing arm;

FIG7 is an exploded schematic diagram of the first swing arm and the second swing arm;

FIG8 is a schematic diagram of the back side of the first damping swing arm and the first synchronous swing arm in FIG5 ;

FIG9 is a schematic diagram of the back side of the second damping swing arm and the second synchronous swing arm in FIG5 ;

FIG10 is an exploded schematic diagram of the first damping swing arm and the first synchronous swing arm in FIG5 ;

FIG11 is a schematic diagram of the sliding member in FIG3;

FIG12 is an exploded schematic diagram of the sliding member, the first swing arm and the second swing arm in FIG5 ;

FIG13 is a schematic diagram of another state of the sliding member, the pin shaft, and the swing arm in FIG5;

FIG14 is a schematic diagram of the cooperation between the sliding member base, the swing arm, and the sliding member in FIG3 ;

FIG15 is a schematic diagram of a sliding member base;

FIG16 is an exploded schematic diagram of FIG14 ;

FIG17 is a top view of the rotating mechanism;

Fig. 18 is a schematic diagram of the back side of the rotating machine;

FIG19 is a schematic diagram of another state of the rotating mechanism;

FIG20 is a schematic diagram of another state of the rotating mechanism;

FIG. 21 is a schematic diagram of the folding process of an electronic device.

illustration:

1. Rotation mechanism, 3. Rotation shaft base, 10. Sliding member, 10a. First spiral slope, 10b. Second spiral slope, 10c. First pin hole, 10c ¹ , second pin hole, 10d. First protrusion, 10d ¹ , second protrusion, 11. First swing arm, 12. Second swing arm, 13. fifth sleeve, 13a. third spiral slope, 17a. fourth spiral slope, 15. first sleeve, 15a ¹ , second concave-convex surface, 15a ² , fourth concave-convex surface, 16. fourth sleeve, 17. sixth sleeve, 17b. first limiter, 17b ¹ , second limiter, 18. first groove, 19. second groove, 20. spring base, 20a. second sleeve, 21. first elastic member, 22. second elastic member, 23. cam base, 23a ¹ , first concave-convex surface, 23a ² , third concave-convex surface, 30, sliding member base, 31, seventh sleeve, 31a, third limiting portion, 31b, fourth limiting portion, 32, eighth sleeve, 41, pin groove structure, 42, buckle structure, 100, middle frame, 121, first pin shaft, 122, second pin shaft, 101, first damping swing arm, 102, second damping swing arm, 111, first synchronous swing arm, 112, second synchronous swing arm, 200, rotating shaft mechanism, 41, pin groove structure, 411, first pin groove, 412, first pin column, 413, second pin groove, 414, second pin column, 42, buckle structure, 421, first clamping portion, 422, first buckling portion, 423, second clamping portion, 424, second buckling portion.

Detailed ways

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

In order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. For example, the first pin and the second pin are only used to distinguish different pins, and do not limit their order. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit them to be different.

It should be noted that, in this application, the words "in one embodiment" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described in this application as "in one embodiment" or "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the words "in one embodiment" or "for example" is intended to present the relevant concepts in a specific way.

In this application, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, or a contact connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

The present application embodiment provides an electronic device, which is exemplarily a mobile phone. The electronic device includes a flexible folding screen (also called a "flexible display screen") and a hinge mechanism 200, and the flexible folding screen is rotated, folded or unfolded through the hinge mechanism 200. Please refer to Figure 1, which is a schematic diagram of a mobile phone in an unfolded state in an embodiment of the present application, showing the hinge mechanism 200 and the middle frame 100, but not showing the flexible folding screen.

The mobile phone includes a hinge mechanism 200 located in the middle, and a middle frame 100 located on both sides of the hinge mechanism 200, and the flexible folding screen is supported on the middle frames 100 on both sides. In this embodiment, the left and right sides are defined with the central axis YY′ of the hinge mechanism 200 as the reference line, and the middle frames 100 on the left and right sides of the hinge mechanism 200 can rotate relative to the hinge mechanism 200, thereby driving the flexible folding screen to fold or unfold. Specifically, a swing arm can be provided, one side of the swing arm is rotatably connected to the hinge mechanism 200, and the other side is fixed to the middle frame 100, and the swing arm realizes the rotational connection between the middle frame 100 and the hinge mechanism 200.

The hinge mechanism 200 of the mobile phone in this embodiment also includes a rotating mechanism 1, which is used to keep the rotation angle β of the middle frame 100 on both sides of the hinge mechanism 200 consistent with the hinge mechanism 200 during the folding and unfolding process. The rotation angle β can be understood with reference to Figure 21. It can be understood that due to manufacturing or assembly tolerances, the rotation angle β of the middle frame 100 on both sides may have a certain angle deviation during the rotation process. Generally, the range of the above-mentioned angle deviation can be 0° to 20°. Within this angle deviation range, the rotation angle can still be regarded as consistent.

In this embodiment, the shaft mechanism 200 includes a rotating mechanism 1. The specific position of the rotating mechanism 1 in the shaft mechanism 200 is shown in FIG. 2. FIG. 2 schematically shows that the rotating mechanism 1 is fixedly installed on the shaft base 3. It should be noted that the number of the rotating mechanisms 1 in the shaft mechanism 200 can be multiple.

The rotating mechanism 1 in this embodiment can be understood with reference to FIGS. 3-4 , where FIG. 3 shows an enlarged view of the circled position in FIG. 2 , ie, a structural diagram of the rotating mechanism 1 , and FIG. 4 is an exploded view of the rotating mechanism 1 in FIG. 3 .

The rotating mechanism in the present application includes a first swing arm 11, a second swing arm 12, a sliding member 10, a first pin 121 and a second pin 122. The rotating mechanism 1 of the present application may also include a sliding member base 30. The sliding member base 30 serves as the basis of the rotating mechanism 1. The sliding member base 30 may be an integral structure with the rotating shaft base 3. The sliding member base 30 is a part of the rotating shaft base 3. Of course, the sliding member base 30 and the rotating shaft base 3 may also be two independent components, which are fixedly connected by a fixing member or other fixing methods (such as welding, screw connection, etc.).

The sliding member base 30 in the rotating mechanism 1 of the present application is used to install the first swing arm 11, the second swing arm 12, the first pin shaft 121, the second pin shaft 122 and the sliding member 10. The sliding member base 10 is arranged on the rotating shaft base 3. The first pin shaft 121 and the second pin shaft 122 are arranged parallel to the rotating shaft base 3. The length direction of the first pin shaft 121 and the second pin shaft 122 is along the axial direction of the rotating mechanism 1. The first pin shaft 121 and the second pin shaft 122 can be fixedly connected to the sliding member base 30, and of course can also be rotatably connected to the sliding member base 30.

In this embodiment, the first swing arm 11 and the second swing arm 12 of the rotating mechanism 1 are connected to the middle frame 100, and the specific connection method is not limited. As long as the first swing arm 11 and the second swing arm 12 have a direct or indirect connection relationship with the middle frame 100, the first swing arm 11 and the second swing arm 12 in the present application are respectively mounted on the first pin 121 and the second pin 122. The first swing arm 11 can rotate around the first pin 121, and the second swing arm 12 can rotate around the second pin 122, which drives the middle frame 100 to rotate accordingly, or when the middle frame 100 rotates, the swing arm on the corresponding side is driven to rotate accordingly, that is, it has a rotation linkage effect. The first swing arm 11 and the second swing arm 12 are symmetrically arranged relative to the central axis YY` of the rotating shaft base 3.

Combined with Figure 5, Figure 5 is a schematic diagram of the cooperation of the sliding member, the pin and the swing arm in Figure 4. As shown in Figure 5, the description is based on the up and down directions marked in Figure 5, and the up and down directions are also sliding directions. The first swing arm 11 and the second swing arm 12 are symmetrically arranged on the left and right sides of the central axis YY' of the sliding member 10, and the first swing arm 11 and the second swing arm 12 on the left and right sides of the sliding member 10 are in an unfolded state, and the central axis YY' of the sliding member 10 is coaxial with the central axis of the rotating shaft mechanism 200. The first swing arm 11 is provided with a sleeve 15 (defined as the first sleeve), a sleeve 16 (defined as the fourth sleeve), a sleeve 13 (defined as the fifth sleeve), and a sleeve 17 (defined as the sixth sleeve) from top to bottom, respectively. The second swing arm 12 is symmetrically arranged with the first swing arm 11 about the central axis YY' of the sliding member 10. It can be understood that the second swing arm 12 is also provided with a sleeve first sleeve 15, a fourth sleeve 16, a fifth sleeve 13, and a sixth sleeve 17 from top to bottom, and the first pin 121 passes through the first sleeve 15, the fourth sleeve 16, the fifth sleeve 13, the sliding member 10, and the sixth sleeve 17 on the first damping swing arm 101 in sequence, and the second pin 122 passes through the first sleeve 15, the fourth sleeve 16, the fifth sleeve 13, the sliding member 10, and the sixth sleeve 17 on the second damping swing arm 102. The sliding member 10 is slidably arranged along the axis direction parallel to the rotation of the first damping swing arm 101 and the second damping swing arm 102.

It needs to be further explained here that the sleeve structure (including sleeve 15, sleeve 16, sleeve 13, sleeve 17) on the first damping swing arm 101 and the second damping swing arm 102 and the pin hole 10c on the sliding part 10 are mainly used to limit radial movement to perform axial sliding constraint. Therefore, the sleeve is not limited to a closed ring shape, and may also have a notch.

6 to 13, FIG. 6 is a schematic diagram of the first swing arm and the second swing arm; FIG. 7 is a schematic diagram of the first swing arm and the second swing arm. Exploded diagram; Figure 8 is a schematic diagram of the back side of the first damping swing arm connected to the first synchronous swing arm in Figure 5; Figure 9 is a schematic diagram of the back side of the second damping swing arm connected to the second synchronous swing arm in Figure 5. Figure 10 is an exploded diagram of the first damping swing arm connected to the first synchronous swing arm in Figure 5, Figure 11 is an exploded diagram of the back side of the first damping swing arm connected to the first synchronous swing arm, Figure 12 is a schematic diagram of a sliding member, and Figure 13 is an exploded diagram of the swing arm and the sliding member.

In one embodiment of the present application, as shown in Figure 6, the first swing arm 11 is provided with a first groove 18, and the first groove 18 has a spiral bevel 13a (defined as a third spiral bevel) on the side (defined as the first side) of the fifth sleeve 13 arranged along the direction of the first pin shaft 121 toward the sixth sleeve 17, and the first groove 18 has a spiral bevel 17a (defined as a fourth spiral bevel) on the side (defined as the second side) of the fifth sleeve 17 arranged along the direction of the first pin shaft 121 toward the fourth sleeve 13, and the first side and the second side are located in the first axial direction of the first pin shaft 121. The second swing arm 12 is provided with a second groove 19, and the second swing arm 12 and the first swing arm 11 are symmetrically arranged about the central axis YY` of the sliding member 10. It can be understood that the second groove 19 has a spiral slope 13a (defined as a third spiral slope) on the side (positioned as the first side) of the fifth sleeve 13 arranged along the direction of the second pin shaft 122 facing the sixth sleeve 17, and the second groove 19 has a spiral slope 17a (defined as a fourth spiral slope) on the side (defined as the second side) of the fifth sleeve 17 arranged along the direction of the second pin shaft 122 facing the fourth sleeve 13. The above-mentioned first side and second side are located on the second axial direction of the second pin shaft 122.

As shown in Fig. 7, the first swing arm 11 and the second swing arm 12 may also be a split structure, the first swing arm 11 includes a relatively separable first damping swing arm 101 and a first synchronous swing arm 111, and the second swing arm 12 includes a relatively separable second damping swing arm 102 and a second synchronous swing arm 112. For example, the first damping swing arm 101 and the first synchronous swing arm 111 are two relatively independent components, and the first damping swing arm 101 and the first synchronous swing arm 111 can move relatively along the first axial direction.

Continuing to understand in combination with Figures 8-10, Figure 8 is a schematic diagram of the back connection between the first damping swing arm 101 and the first synchronous swing arm 111; Figure 9 is a schematic diagram of the back connection between the second damping swing arm 102 and the second synchronous swing arm 112; Figure 10 is an exploded view of the connection between the first damping swing arm 101 and the first synchronous swing arm 111.

In another embodiment of the present application, as shown in FIG8 and FIG9, the first damping swing arm 101 and the first synchronous swing arm 111 have a constraint along the first axial direction so that the two rotate synchronously. The first damping swing arm 101 and the first synchronous swing arm 111 can be constrained by a constraint structure so that they cannot rotate or separate from each other. The constraint structure can be a pin groove structure and a buckle structure. For example, the first damping swing arm 101 and the first synchronous swing arm 111 are connected by a pin groove structure 41, and the first damping swing arm 101 and the first synchronous swing arm 111 can also be connected by a pin groove structure 41 and a buckle structure 42. Specifically, the pin groove structure 41 is used to limit the relative rotation of the first damping swing arm 101 and the first synchronous swing arm 111 during the rotation around the first pin shaft 121, so that the first damping swing arm 101 and the first synchronous swing arm 111 maintain the same rotation angle relative to the first pin shaft 121 during the rotation. The buckle structure 42 is used to limit the relative separation of the first damping swing arm 101 and the first synchronous swing arm 111 along the direction of the pin shaft during the rotation around the first pin shaft 121, so that the first damping swing arm 101 and the first synchronous swing arm 111 are connected as a whole during the rotation around the first pin shaft 121, and the two rotate together around the first pin shaft 121. It can be understood that the second swing arm 12 and the first swing arm 11 are symmetrically arranged, and the connection method between the second damping swing arm 102 and the second synchronous swing arm 112 can be understood by referring to the connection method between the first damping swing arm 101 and the first synchronous swing arm 111.

In this example, as shown in Figure 10, taking the connection between the first damping swing arm 101 and the first synchronous swing arm 111 as an example, the connection structure between the first damping swing arm 101 and the first synchronous swing arm 111 includes a first pin groove 411 and a first pin column 412, and the first pin shaft 411 cooperates with the first pin shaft 411 in the axial direction parallel to the first pin shaft 121, and the first pin column 412 is inserted into the first pin groove 411. Through the cooperation between the first pin column 412 and the first pin groove 411, the rotation directions of the first damping swing arm 101 and the first synchronous swing arm 111 are restricted to be different, so that the first damping swing arm 101 and the first synchronous swing arm 111 rotate synchronously. The second damping swing arm 102 and the second synchronous swing arm 112 are connected in the same manner as the first damping swing arm 101 and the first synchronous swing arm 111. The connection structure between the second damping swing arm 102 and the second synchronous swing arm 112 includes a second pin groove 413 and a second pin column 414. The second pin column 414 cooperates with the second pin groove 413 in an axial direction parallel to the second pin shaft 122 to limit the second damping swing arm 102 and the second synchronous swing arm 112 to have different rotation directions, so that the second damping swing arm 102 and the second synchronous swing arm 112 rotate synchronously. At the same time, this assembly method can keep the thickness of the swing arm in the Z direction, making the overall structure lighter and thinner.

The connection structure between the first damping swing arm 101 and the first synchronous swing arm 111 also includes a first clamping portion 421 and a first buckling portion 422. The first clamping portion 422 cooperates with the first buckling portion 421 on a plane perpendicular to the first damping swing arm 101. The first clamping portion 421 and the first buckling portion 422 cooperate to limit the separation of the first damping swing arm 101 and the first synchronous swing arm 111. The second damping swing arm 102 has the same snap-fit connection structure as the second synchronous swing arm 112. The connection structure between the second damping swing arm 102 and the second synchronous swing arm 112 also includes a second snap-fit portion 423 and a second snap-fit portion 424. The second snap-fit portion 423 cooperates with the second snap-fit portion 424 on a plane perpendicular to the second damping swing arm 102. Through the cooperation between the second snap-fit portion 423 and the second snap-fit portion 424, the separation of the second damping swing arm 102 and the second synchronous swing arm 112 is limited. At the same time, through this assembly method, the thickness of the swing arm in the Z direction will not be increased, making the overall structure lighter and thinner.

It should be noted that the first pin slot 411 and the second pin slot 413 in the pin slot structure 41 can be a long slot with a notch, or a cylindrical hole with a certain depth, or other shapes, which are not specifically limited in this application. The first pin column 412 and the second pin column 414 in the pin slot structure 41 can be cylindrical or prism-shaped, or other shapes, which are not specifically limited in this application, as long as the first pin slot 411 and the first pin column 412 and the second pin slot 413 and the second pin column 414 can cooperate with each other, the first damping swing arm 101 and the first synchronous swing arm 111 and the second damping swing arm 102 and the second synchronous swing arm 112 can be limited to rotate in different directions.

The shape of the first clamping portion 421 and the second clamping portion 423 in the clamping structure 42 can be a rectangle, a square or other shapes, and the shape of the first buckling portion 422 and the second buckling portion 424 in the clamping structure 42 can also be a rectangle, a square or other shapes. As long as the first clamping portion 421 and the first buckling portion 422 can cooperate with each other, and the second clamping portion 423 and the second buckling portion 424 can cooperate with each other, the first damping swing arm 101 and the first synchronous swing arm 111, and the second damping swing arm 102 and the second synchronous swing arm 112 can be limited to separate from each other.

In the embodiment of the present application, as shown in FIG. 11 , the sliding member 10 is symmetrically provided with a first protruding portion 10d and a second protruding portion 10d ¹ on both sides of the central axis YY`, and the first protruding portion 10d and the second protruding portion 10d <sup>1</sup> are symmetrically provided relative to the central axis YY` of the sliding member 10. The first protruding portion 10d and the first swing arm 11 are sleeved on the first pin shaft 121, and the second protruding portion 10d ¹ and the second swing arm 12 are sleeved on the second pin shaft 122. The first protruding portion 10d is provided with a first pin hole 10c, and the second protruding portion 10d ¹ is provided with a second pin hole 10c ¹ , the first pin shaft 121 passes through the first pin hole 10c, the second pin shaft 122 passes through the second pin hole 10c ¹ , the first pin shaft 121 passes through the first swing arm 11 and the first protruding portion 10d, and the second pin shaft 122 passes through the second swing arm 12 and the second protruding portion 10d ¹ . The first protrusion 10d is respectively provided with a first end face and a second end face along the first axial direction, the first end face is formed with a first spiral slope 10a, and the second end face is formed with a second spiral slope 10b. Similarly, the second protrusion ^10d1 is also provided with a first end face and a second end face along the second axial direction, the first end face of the second protrusion ^10d1 is formed with a first spiral slope ^10a1 , and the second end face of the second protrusion ^10d1 is formed with a second spiral slope ^10b1

Continuing to refer to 12, the first damping swing arm 101 and the second damping swing arm 102 are symmetrically arranged about the central axis YY' of the sliding member 10, the first synchronous swing arm 111 and the second synchronous swing arm 112 are symmetrically arranged about the central axis YY' of the sliding member 10, and the sliding member 10 is arranged in close contact with the first damping swing arm 101, the second damping swing arm 102, the first synchronous swing arm 111, and the second synchronous swing arm 112 along the YY' direction. The first end of the first protrusion 10d of the sliding member 10 is spirally engaged with the first side of the first groove 18, and the second end of the first protrusion 10d of the sliding member 10 is spirally engaged with the second side of the first groove 18. The first end of the second protrusion ^10d1 of the sliding member 10 is spirally engaged with the first side of the second groove 19, and the second end of the second protrusion ^10d1 of the sliding member 10 is spirally engaged with the second side of the second groove 19. Specifically, the first spiral bevel 10a of the first protrusion 10d of the sliding member 10 is spirally fitted with the third spiral bevel 13a on the first damping swing arm 101 facing the sliding member 10, and the second spiral bevel 10b of the first protrusion 10d of the sliding member 10 is spirally fitted with the fourth spiral bevel 17a of the first synchronous swing arm 111 facing the sliding member 10. The fitting of the first spiral bevel 10a of the first protrusion 10d with the third spiral bevel 13a of the first damping swing arm 101 and the second spiral bevel 10b of the second protrusion ^10d1 with the fourth spiral bevel 17a of the first synchronous swing arm 111 can improve the synchronization accuracy of the second swing arm 12 driven to rotate by the sliding member 10 when the first swing arm 11 rotates around the first pin 121. Sliding member The cooperation manner of the first spiral bevel ^{10a 1 and} the second spiral bevel 10b ¹ on the two end surfaces of the second protrusion 10d 1 of 10 with the second damping swing arm 102 and the second synchronous swing arm 112 can be understood by referring to the cooperation manner of the first spiral bevel 10a and the second spiral bevel 10b of the first protrusion 10d of the above-mentioned sliding member 10 with the first damping swing arm 101 and the first synchronous swing arm 111. The cooperation manner is the same and will not be repeated here.

It can be understood that the first pin shaft 121 passes through the first sleeve 15 on the first damping swing arm 101, the fourth sleeve 16 on the first damping swing arm 101, the fifth sleeve 13 on the first damping swing arm 101, the first pin hole 10c, and the sixth sleeve 17 on the first synchronous swing arm 111 in sequence, and the second pin shaft 122 passes through the first sleeve 15 on the second damping swing arm 102, the fourth sleeve 16 on the second damping swing arm 102, the fifth sleeve 13 on the second damping swing arm 102, the second pin hole 10c ¹ , and the sixth sleeve 17 at the lower end of the second synchronous swing arm 112 in sequence.

In the embodiment of the present application, as shown in FIG. 13 , FIG. 13 is a schematic diagram of the intermediate state of the rotation of the first swing arm 11 and the second swing arm 12. Specifically, in the process of the first swing arm 11 and the second swing arm 12 rotating from position one to position two, for example, in the process of the first swing arm 11 rotating from the flattened state to the state shown in FIG. 13 , the first swing arm 11 rotates around a direction perpendicular to the first pin shaft 121 relative to the second pin shaft 122, and the first groove 18 rotates accordingly, and the third spiral inclined surface 13a matched with the first protrusion 10d and the first spiral inclined surface 13a matched with the first protrusion 10d are rotated. The four spiral bevels 17a will also rotate accordingly, and the third spiral bevel 13a will press against the first protrusion 10d during the rotation. The pressure of the third spiral bevel 13a on the first protrusion 10d pushes the sliding member 10 to move downward along the first pin shaft 121. When the sliding member 10 moves downward along the first pin shaft 121, the fourth spiral bevel 17a that cooperates with the first protrusion 10d will rotate in coordination with the first protrusion 10d. The fourth spiral bevel 17a rotates with the first synchronous swing arm 111 to provide an avoidance space for the protrusion 10d to move downward. At the same time, on the other side of the central axis YY` of the sliding member 10, when the sliding member 10 moves downward along the first pin shaft 121, the second protrusion ^10d1 on the other side of the sliding member 10 will press against the fourth spiral slope 17a on the second side of the second groove 19, and the pressing will generate a pressure perpendicular to the fourth spiral slope 17a, and the pressure decomposition will provide a component force perpendicular to the second pin shaft 122 toward the first pin shaft 121, and the component force drives the second synchronous swing arm 112 to rotate around the second pin shaft 122, so that the first swing arm 11 rotates around the first pin shaft 121 in a direction relative to the second pin shaft 122, and drives the second swing arm 12 to rotate around the second pin shaft 122 in a direction relative to the first pin shaft 121. The first swing arm 11 drives the sliding member 10 to move downward through the spiral cooperation between the first groove 18 and the first protrusion 10d. When the sliding member 10 moves downward, through the second protrusion 10d The spiral fit between the second groove ¹⁹ and the second swing arm 12 drives the second swing arm 12 to rotate around the second pin 122, so as to achieve the effect of synchronous rotation of the first swing arm and the second swing arm on both sides of the central axis YY' of the sliding member 10. Similarly, the second damping swing arm 102 and the first damping swing arm 101 are symmetrically arranged about the central axis YY' of the sliding member 10, and the second synchronous swing arm 112 and the first synchronous swing arm 111 are symmetrically arranged about the central axis YY' of the sliding member 10, so when the second swing arm 12 rotates around the second pin 122 in a direction relative to the first pin 121, it can be understood by referring to the rotation of the first swing arm 11 around the first pin 121, and the working principle of the two during the rotation process is the same.

Specifically, when the first swing arm 11 rotates from the second position to the first position, for example, from the state shown in Figure 13 to the flattened state, the first swing arm 11 rotates around the first pin shaft 121 in a direction away from the second pin shaft, and the third spiral bevel 13a and the fourth spiral bevel 17a corresponding to the first protrusion 10d will rotate accordingly. The fourth spiral bevel 17a will exert pressure on the first protrusion 10d during the rotation process. The pressure of the fourth spiral bevel 17a on the protrusion 10d pushes the sliding member 10 to move upward along the first pin shaft 121. When the sliding member 10 moves upward along the first pin shaft 121, the third bevel 13a cooperating with the first protrusion 10d will rotate in coordination with the protrusion 10d, and the third spiral bevel 13a rotates with the first damping swing arm 101 to provide an escape space for the protrusion 10d to move upward. At the same time, on the other side of the central axis YY` of the sliding member 10, when the sliding member 10 moves upward along the first pin shaft 121, the second protrusion ^10d1 of the sliding member 10 will press against the third spiral slope 13a of the first side of the second groove 19, and the pressing will generate a pressure perpendicular to the third spiral slope 13a, and the pressure will decompose into a component force perpendicular to the second pin shaft 122 away from the first pin shaft 121, and the component force drives the second damping swing arm 102 to rotate around the second pin shaft 122 in a direction away from the first pin shaft 121, so as to realize the first swing arm 11 to rotate around the first pin shaft 121 in a direction away from the second pin shaft 122, and drive the second swing arm 12 to rotate around the second pin shaft 122 in a direction away from the first pin shaft 121. The first swing arm 11 drives the sliding member 10 to move upward through the spiral cooperation between the first groove 18 and the first protrusion 10d. When the sliding member 10 moves upward, through the second protrusion 10d The spiral fit between ¹ and the second groove 19 drives the second swing arm 12 to rotate around the second pin The shaft 122 rotates to achieve the effect of synchronous rotation of the first swing arm 11 and the second swing arm 12 on both sides of the central axis YY' of the sliding member 10. Similarly, the second damping swing arm 102 and the first damping swing arm 101 are symmetrically arranged about the central axis YY' of the sliding member 10, and the second synchronous swing arm 112 and the first synchronous swing arm 111 are symmetrically arranged about the central axis YY' of the sliding member 10, so when the second swing arm 12 rotates around the second pin shaft 122 in a direction away from the first pin shaft 121, it can be understood by referring to the first swing arm 11 rotating around the first pin shaft 121 in a direction away from the second pin shaft 122, and the working principle of the two during rotation is the same.

The embodiment of the present application is based on the cooperation between the first protrusion 10d of the sliding member 10 and the first groove 18 of the first swing arm 11 and the second protrusion ^10d1 and the second groove 19 of the second swing arm 12, so as to realize that the first swing arm 11 rotates around the first pin 121 to drive the second swing arm 12 to rotate around the second pin 122, thereby realizing the synchronous rotation of the first swing arm 11 and the second swing arm 12 on both sides of the central axis YY` of the sliding member 10. Compared with the synchronous structure of the gear set, the size of the rotating mechanism under the small size requirement of the foldable electronic device can be further reduced. Only one sliding member 10 is needed to realize the synchronous movement of the first swing arm 11 and the second swing arm 12 on both sides of the rotating mechanism 1, which is simpler to manufacture and also has the advantages of stable synchronous transmission and higher reliability.

It should be noted that the first pin shaft 121 and the second pin shaft 122 pass through the first pin hole 10c and the second pin hole 10c ¹ on both sides of the central axis YY` of the sliding member 10 respectively, the first swing arm 11 rotates around the first pin shaft 121, and the second swing arm 12 rotates around the second pin shaft 122, that is, the first pin hole 10c and the second pin hole 10c <sup>1</sup> on both sides of the central axis YY` of the sliding member 10 are concentric with the first pin shaft 121 and the second pin shaft 122 respectively, and the two share the same shaft, that is, the first pin shaft 121 and the second pin shaft 122, which has better synchronization and can save parts and space.

In the embodiment of the present application, when the first damping swing arm 101 and the second damping swing arm 102 rotate around the first pin shaft 121 and the second pin shaft 122, the first protrusion 10d and the second protrusion ^10d1 of the sliding member 10 can always be tightly matched with the first groove 18 and the second groove 19 along the axial direction, respectively, and the first spiral bevel 10a and the second spiral bevel 10b of the first protrusion 10d are always tightly matched with the third spiral bevel 13a and the fourth spiral bevel ^17a on the first damping swing arm ¹⁰¹ and the first synchronous swing arm 111 along the axial direction. The third spiral bevel 13a and the fourth spiral bevel 17a on the second damping swing arm ¹⁰² and the second synchronous swing arm 112 are tightly fitted axially, so that when the first swing arm 11 rotates around the first pin 121 or the second swing arm 12 rotates around the second pin 122, a linkage effect of the sliding member 10 and the first swing arm 11 and the second swing arm 12 can be formed, so that when the first swing arm rotates, the second swing arm also rotates, and the first groove 18 and the second groove 19 are tightly matched with the first protrusion 10d and the second protrusion 10d ¹ of the sliding member 10, which can ensure that the sliding member 10 and the first swing arm 11 and the second swing arm 12 can work more stably and have a better synchronization effect.

In the embodiment of the present application, the first protrusion 10d on one side of the central axis YY` of the sliding member 10 is inserted into the first groove 18 formed by the first damping swing arm 101 and the first synchronous swing arm 111, and the second protrusion 10d1 of the sliding member <sup>10</sup> is inserted into the second groove 19 formed by the second damping swing arm 102 and the second synchronous swing arm 112. The essence of the interaction between the first protrusion 10d and the second protrusion <sup>10d1</sup> on both sides of the central axis YY` of the sliding member 10 and the first groove 18 and the second groove 19 is that when the first groove 18 rotates with the first damping swing arm 101 and the first synchronous swing arm 111, and the second groove 19 rotates with the second damping swing arm 102 and the second synchronous swing arm 112, the axial position of the first groove 18 and the second groove 19 facing the first protrusion 10d and the second protrusion ^10d1 will change, and the groove side surfaces of the first groove 18 and the second groove 19, that is, the third spiral slope 13a and the fourth spiral slope 17a, will push the first protrusion 10d and the second protrusion 10d1. ¹ , and then drive the sliding member 10 to move in the axial direction. Conversely, when the sliding member 10 moves in the axial direction, the first protrusion 10d and the second protrusion 10d ¹ on the corresponding side will also push the third spiral slope 13a and the fourth spiral slope 17a on the corresponding side. At this time, the first groove 18 and the second groove 19 will also rotate to adjust to the corresponding position and maintain a spiral tight matching relationship with the first protrusion 10d and the second protrusion 10d ^1. Therefore, the width of the first protrusion 10d and the second protrusion 10d ¹ along the YY' direction should be roughly equal to the width of the first groove 18 and the second groove 19 in the YY' direction. The width of the first protrusion 10d and the second protrusion 10d ¹ can be slightly smaller than the width of the first groove 18 and the second groove 19, so as to ensure that the two can always interact with each other without interfering with the relative movement of the two.

Continuing to refer to FIG. 14 to FIG. 16, FIG. 14 is a schematic diagram of the cooperation between the swing arm, the sliding member and the sliding member base; FIG. 15 is a schematic diagram of the sliding member base; Figure 16 is a schematic diagram of the cooperation between the swing arm, the sliding member and the sliding member base.

As shown in FIG14 , the rotating mechanism 1 of the embodiment of the present application further comprises a sliding member base 30, wherein the sliding member base 30 is fixedly mounted on the rotating shaft base 3, wherein the first side of the sliding member base 30 is fixed on the rotating shaft base, and the sliding member 10 is mounted on the second side of the sliding member base 30 away from the rotating shaft base 30, and the sliding member base 30 serves as the basis of the rotating mechanism 1, and is used to mount the first swing arm 11, the second swing arm 12, the first pin 121, and the second pin 122. The first pin 121 and the second pin 122 are fixedly connected to the sliding member base 30, and optionally, the first pin 121 and the second pin 122 can also be rotatably connected to the sliding member base 30, and the rotation axis of the first pin 121 and the second pin 122 can be consistent with the rotation axis of the first swing arm 11 and the second swing arm 12, and the first swing arm 11 and the second swing arm 12 are rotatably matched with the sliding member base 30, and the first swing arm 11 and the second swing arm 12 can rotate relative to the sliding member base 30.

As shown in FIG15 , two sleeves 32 (defined as the eighth sleeve) and two sleeves 31 (defined as the seventh sleeve) are respectively arranged at the upper and lower ends of the sliding member base 30. The two eighth sleeves 32 are symmetrically arranged about the sliding member center axis YY', and the two seventh sleeves 31 are symmetrically arranged about the sliding member center axis YY'. The first pin 121 and the second pin 122 are respectively inserted into the seventh sleeve 31 and the eighth sleeve 32 on the corresponding side. The first pin 121 and the second pin 122 are constrained by the sliding member base 30. It should be noted that the seventh sleeve 31 and the eighth sleeve 32 may have a notch as long as they can be limited. The seventh sleeve 31 located in the first axial direction is extended to one end of the eighth sleeve 32 in the first axial direction with a third limiting portion 31a, and the seventh sleeve 31 located in the second axial direction is extended to one end of the eighth sleeve 32 in the second axial direction with a fourth limiting portion 31b. The third limiting portion 31 a of the first axial eighth sleeve 32 is used to cooperate with the first synchronous swing arm 111 , and the fourth limiting portion 31 of the second axial eighth sleeve 32 is used to cooperate with the second synchronous swing arm 112 .

As shown in FIG16 , the first damping swing arm 101 is provided with a first sleeve 15, a fourth sleeve 16, and a fifth sleeve 13 in sequence along the first axial direction, wherein a receiving cavity 25 (defined as a first receiving cavity) is formed between the fourth sleeve 16 and the fifth sleeve 13, and the second damping swing arm 102 is also provided with a first sleeve 15, a fourth sleeve 16, and a fifth sleeve 13 in sequence along the second axial direction, wherein a receiving cavity 26 (defined as a second receiving cavity) is also formed between the fourth sleeve 16 and the fifth sleeve 13. The first receiving cavity 25 formed on the first damping swing arm 101 and the second receiving cavity 26 formed on the second damping swing arm 102 are symmetrically arranged about the central axis YY' of the sliding member base 30. The eighth sleeve 32 along the first axial direction of the sliding member base 30 is installed in the first accommodating cavity 25 on the first damping swing arm 101, and the eighth sleeve 32 on the right side of the upper end of the sliding member 30 is installed in the second cavity 26 on the second damping swing arm 102, and the length of the eighth sleeve 32 on the left and right sides of the upper end of the sliding member base 30 along the Y direction is smaller than the length of the first accommodating cavity 25 and the second accommodating cavity 26 along the Y direction.

A first limiting portion 17b is provided on the sixth sleeve 17 arranged along the first axial direction of the first synchronous swing arm 111, and is extended toward one end of the seventh sleeve 31 arranged along the first axial direction of the sliding member base 30. A second limiting portion 17b ¹ is provided on the sixth sleeve 17 arranged along the second axial direction of the second synchronous swing arm 112, and is extended toward one end of the seventh sleeve 31 arranged along the second axial direction of the sliding member base 30. The first limiting portion 17b cooperates with the third limiting portion 31a of the first axial direction of the sliding member base 30, so as to limit the first synchronous swing arm 111 from exceeding the plane where the second side of the sliding member base 30 is located when rotating around the first pin shaft 121, and to limit the expansion angle of the first synchronous swing arm 111 relative to the sliding member base 30. The second limiting portion ^17b1 is in abutment with the fourth limiting portion 31b on the second axial direction of the sliding member base 30 to limit the second synchronous swing arm 112 from exceeding the plane of the second side of the sliding member base 30 when rotating around the second pin shaft 122, and limit the expansion angle of the second synchronous swing arm 112 relative to the sliding member base 30, thereby limiting excessive rotation of the middle frame on both sides of the rotating shaft. When the middle frames on both sides of the rotating shaft are fully expanded, the first limiting portion 17b and the third limiting portion 31a are in abutment with each other, and the second limiting portion ^17b1 and the fourth limiting portion 31b are in abutment with each other, and the first swing arm 11 and the second swing arm 12 on both sides of the sliding member base 30 cannot continue to rotate in the expansion direction.

Continuing to refer to Figures 17 to 21, Figure 17 is a top view of the rotating mechanism 1 in the unfolded state; Figure 18 is an enlarged schematic diagram of the cooperation between the cam 23a and the swing arm in the rotating mechanism 1; Figure 19 is another enlarged schematic diagram of the cooperation between the cam 23a and the swing arm in the rotating mechanism 1; Figure 20 is a schematic diagram of the unfolded back of the rotating mechanism 1; Figure 21 is a schematic diagram of the rotation process of the rotating mechanism 1.

Preferably, as shown in FIG. 17 , the rotating mechanism 1 of the embodiment of the present application further comprises a spring base 20, a first elastic member 21, a second elastic member 22, and a cam base 23. The spring base 20 is fixed on the rotating shaft base 3, and the spring base 20 is symmetrically arranged on both sides of the central axis YY′. A second sleeve 20a is disposed, and a first cam 23a and a second cam 23a are symmetrically disposed on both sides of the cam base 23 along the central axis YY'. The first cam 23a abuts and cooperates with the first swing arm 11, and the second cam 23a abuts and cooperates with the second swing arm 12. The first elastic member 21 and the second elastic member 22 are disposed between the spring base 20 and the cam base 23, and the first elastic member 21 and the second elastic member 22 are symmetrically disposed about the central axis YY'.

One end face of the first cam 23a facing away from the first elastic member 21 abuts against one end face of the first damping swing arm 101 facing the first cam 23a, and one end face of the second cam 23a facing away from the second elastic member 22 abuts against one end face of the second damping swing arm 102 facing the second cam 23a. Under the action of the axial force along the first axial direction provided by the first elastic member 21, the first cam 23a presses against the first damping swing arm 101, so that the first groove 18 of the first swing arm 11 is closely fitted with the first protrusion 10d of the sliding member 10. Under the action of the axial force along the second axial direction provided by the second elastic member 22, the second cam 23a presses against the second damping swing arm 102, so that the second groove 19 of the second swing arm 12 is closely fitted with the second protrusion 10d ¹ of the sliding member 10.

As shown in FIG18 , preferably, the first damping swing arm 101 and the first synchronous swing arm 111 and the second damping swing arm 102 and the second synchronous swing arm 112 are connected through a pin groove structure 41 and a buckle structure 42, the first pin 412 is inserted into the first pin groove 411, the second pin 414 is inserted into the second pin groove 413, and a gap (called gap 1) is provided between the first pin 412 and the first pin groove 411 during assembly. The first buckling portion 421 is buckled in the first clamping portion 422, the second buckling portion 423 is buckled in the second clamping portion 424, and a gap (called gap 2) is provided between the first buckling portion 421 and the first clamping portion 422 during assembly, and gap 1 and gap 2 can be adjusted as needed, for example, the range of gap 1 and gap 2 can be between 0.1 mm and 0.3 mm.

In the embodiment of the present application, the first elastic member 21 and the second elastic member 22 are in a pre-stressed state. When the sliding member 10 slides relative to the sliding member base 30 and rubs against the first groove 18 and the second groove 19 to produce wear, the axial force provided by the first elastic member 21 and the second elastic member 22 can push the first damping swing arm 101 to move along the axial direction of the first pin shaft 121 and the second damping swing arm 102 to move along the axial direction of the second pin shaft 122. The first damping swing arm 101 moves toward the first synchronous swing arm 111, and the second damping swing arm 102 moves toward the second synchronous swing arm 112, thereby reducing the gap between the gap 1 and the gap 2, and the sliding member base is closed. The fixing effect of 30 makes the first swing arm 11, the sliding member 10 and the second swing arm always in a close contact state. Through the gaps 1 and 2 of the pin groove structure 41 and the snap structure 42 between the first damping swing arm 101 and the first synchronous swing arm 111 and the second damping swing arm 102 and the second synchronous swing arm 112, the elastic force provided by the first elastic member 21 and the second elastic member 22 can compensate for the wear gap caused by the friction between the sliding member 10 and the first swing arm 10 and the second swing arm 12, thereby ensuring that when the swing arm on one side of the sliding member base 30 rotates, the swing arm on the other side will rotate accordingly, thereby improving the synchronization accuracy of the swing arms on both sides of the rotating mechanism 1.

In the embodiment of the present application, the first pin shaft 121 passes through the second sleeve 20a, the first elastic member 21, the first cam 23a, the first swing arm 11, the first protrusion 10d of the sliding member 10 and the sliding member base 30 in sequence, and the second pin shaft 122 passes through the second sleeve 20a, the second elastic member 22, the second cam 23a, the second swing arm 12, the second protrusion 10d ¹ of the sliding member 10 and the sliding member base 30 in sequence. The first elastic member 21 and the first swing arm 11 share the first pin shaft 121, and the second elastic member 22 and the second swing arm 12 share the second pin shaft 122. When the axial force provided by the first elastic member 21 presses the first damping swing arm 101 and the axial force provided by the second elastic member 22 presses the second damping swing arm 102, the first swing arm 11 and the second swing arm 12 will not generate additional torque during the rotation process, thereby reducing the friction between the first swing arm 11 and the first pin shaft 121, and the second swing arm 12 and the second pin shaft 122.

As shown in FIG19 , a first concavoconvex surface 23a ¹ is provided on an end surface of the first cam 23a of the cam base 23 away from the first elastic member 21, and a second concavoconvex surface 15a ¹ is provided on an end surface of the first sleeve 15 on the first damping swing arm 101 facing the first cam 23a, and the first concavoconvex surface 23a ¹ cooperates with the second concavoconvex surface 15a ^1. A third concavoconvex surface 23a ² is provided on an end surface of the second cam 23a away from the second elastic member 22, and a fourth concavoconvex surface 15a ² is provided on an end surface of the first sleeve 15 on the second damping swing arm 102 facing the second cam 23a, and the third concavoconvex surface 23a ² cooperates with the fourth concavoconvex surface 15a ² .

In the embodiment of the present application, the first elastic member 21 and the second elastic member 22 are in a pre-compression state, and the first elastic member 21 presses the first cam 23a against the first damping swing arm 101, so that the first concave-convex surface ^23a1 cooperates with the second concave-convex surface ^15a1 on the first damping swing arm 101. The second elastic member 22 presses the second cam 23 a against the second damping swing arm 102 , so that the third concave-convex surface 23 a ² on the second cam 23 a matches with the fourth concave-convex surface on the second damping swing arm 102 . For example, as shown in Figure 20, when the first swing arm 11 rotates around the first pin 121 and the second swing arm 12 rotates around the second pin 122, when the rotating mechanism 1 rotates from the state of Figure 19 to the state of Figure ²⁰ , the third concave-convex surface ^23a2 of the second cam 23a and the fourth concave-convex surface ^15a2 of the second damping swing arm 102 rotate from a mutually matching state to a mutually abutting state. During this rotation process, the third concave-convex surface 23a2 of the second cam 23a will generate sliding friction with the fourth concave-convex surface ^15a2 of the second damping swing arm 102, and the second cam 23a generates rotational resistance to the second damping swing arm 102 around the second pin 122, so that the second damping swing arm 102 generates damping during the rotation of the second damping swing arm 102 around the second pin 122, so that the second swing arm 12 can hover at a certain position during the rotation around the second pin 122, and the middle frame connected to the second swing arm 12 can be more silky and smooth during the opening and closing process. Similarly, the first concave-convex surface ^23a1 of the first cam 23a and the second concave-convex surface ^15a1 of the first damping swing arm 101 rotate from a mutually fitting state to a mutually abutting state. During this rotation process, the first concave-convex surface ^23a1 of the first cam 23a will generate sliding friction with the second concave-convex surface ^15a1 of the first damping swing arm 101. The first cam 23a generates rotational resistance to the first damping swing arm 101 around the first pin shaft 121, thereby generating damping during the rotation of the first damping swing arm 101 around the first pin shaft 121.

It should be noted that in this embodiment, the number of the first elastic member 21 and the second elastic member 22 is not limited to one, and can be multiple, as long as it can provide axial force to the first damping swing arm 101 and the second damping swing arm 102, so that the first damping swing arm 101, the second damping swing arm 102, the first synchronous swing arm 111, and the second synchronous swing arm 112 are always in a close contact state with the sliding member 10 during the rotation process. On the other hand, the cam base 23, the first elastic member 21, and the second elastic member 22 in this embodiment can also be installed at one end of the sliding member base 30, or the cam base 23, the first elastic member 21, and the second elastic member 22 can be installed at both the upper and lower ends of the rotating mechanism 1 to provide damping for the rotating mechanism 1 during the rotation process and compensate for the wear clearance generated by the sliding member 10 during the sliding process.

In this embodiment, the elastic force provided by the first elastic member 21 and the second elastic member 22 can not only compensate for the gap caused by friction during the sliding process of the sliding member 10, but also provide damping for the swing arm during the rotation process. In this embodiment, the spring base 20, the cam base 23, the first elastic member 21, the second elastic member 22, the first swing arm 11, the second swing arm 12, the sliding member 10 and the sliding member base 30 cooperate with each other to achieve the synchronous movement of the first swing arm 11 and the second swing arm 12 on both sides of the rotating mechanism 1. The axial force provided by the first elastic member 21 and the second elastic member 22 can also compensate for the gap caused by the wear of the sliding member 10, thereby improving the synchronization accuracy of the rotating mechanism. The axis of the first elastic member 21 is the same as the axis of the rotating shaft of the first swing arm 11, and the axis of the second elastic member 22 is the same as the axis of the rotating shaft of the second swing arm 12, which will not cause the first swing arm 11 and the second swing arm 12 to generate additional torque during the rotation process. The axial force provided by the first elastic member 21 and the second elastic member 22 can also provide a certain damping for the rotating shaft.

Figure 21 illustrates the process of achieving synchronous rotation of the middle frames on both sides of the rotating shaft mechanism through the rotating mechanism 1. Specifically, as shown in Figure 21, the middle frame 100 on one side is rotated relative to the rotating shaft base 3 by the external force F, and the swing arm connected to the middle frame 100 will rotate accordingly. The rotation of the swing arm drives the sliding member 10 in the rotating mechanism 1 to move axially. The movement of the sliding member 10 will react on the swing arm on the other side of the axis of the sliding member 10, driving the swing arm on the other side to rotate accordingly. The swing arm on the other side drives the middle frame 100 connected thereto to rotate, thereby achieving nearly consistent rotation angles of the swing arms on both sides of the rotating shaft relative to the rotating shaft base.

The above embodiments are mainly described for foldable screen mobile phones. It can be seen that it is not limited to foldable screen mobile phones, but can also be other electronic devices. It is not only applicable to electronic devices with foldable screens. As long as the electronic device has the requirement of relatively synchronous rotation, this solution can be adopted. For example, the electronic device can be a tablet computer, a laptop computer, or a wearable device, a vehicle-mounted device, an augmented reality (AR)/virtual reality (VR) device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA) and other mobile terminals, or it can also be a digital camera, a SLR camera/micro single camera, a sports camera, a gimbal camera, a drone and other professional shooting equipment.

This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help It should be noted that, for ordinary technicians in this technical field, several improvements and modifications can be made to this application without departing from the principles of this application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

Claims (16)

A rotating shaft mechanism, characterized by comprising: A rotating shaft base and a rotating mechanism, wherein the rotating mechanism is fixed on the rotating shaft base; The rotating mechanism comprises a sliding member, a first pin shaft, a second pin shaft, a first swing arm, and a second swing arm, wherein the sliding member is symmetrically provided with a first protrusion and a second protrusion, wherein the first protrusion and the first swing arm are sleeved on the first pin shaft, and the second protrusion and the second swing arm are sleeved on the second pin shaft; The first end and the second end of the first protrusion are located in the first axial direction where the first pin shaft is located; the first end and the second end of the second protrusion are located in the second axial direction where the second pin shaft is located; the first swing arm is provided with a first groove, and the first side and the second side of the first groove are located in the first axial direction; the second swing arm is symmetrically provided with a second groove relative to the first swing arm, and the first side and the second side of the second groove are located in the second axial direction; the first end of the first protrusion is spirally matched with the first side of the first groove, and the second end of the first protrusion is spirally matched with the second side of the first groove; the first end of the second protrusion is spirally matched with the first side of the second groove, and the second end of the second protrusion is spirally matched with the second side of the second groove; The first swing arm rotates around the first pin; The first swing arm drives the sliding member to slide under the spiral cooperation between the first groove and the first protrusion; The sliding member drives the second swing arm to rotate around the second pin under the spiral cooperation between the second protrusion and the second groove, and the rotation direction of the second swing arm is opposite to the rotation direction of the first swing arm. The rotating shaft mechanism according to claim 1 is characterized in that the first swing arm includes a first damping swing arm and a first synchronous swing arm, and the first damping swing arm is connected to the first synchronous swing arm to form the first groove; the second swing arm includes a second damping swing arm and a second synchronous swing arm, and the second damping swing arm is connected to the second synchronous swing arm to form the second groove. The rotating shaft mechanism according to claim 2, characterized in that the connection structure between the first damping swing arm and the first synchronous swing arm comprises a first pin groove and a first pin column, and the first pin column cooperates with the first pin groove in parallel to the first axial direction to limit the first damping swing arm and the first synchronous swing arm from rotating in different directions; The connection structure between the second damping swing arm and the second synchronous swing arm includes a second pin groove and a second pin column, and the second pin column cooperates with the second pin groove in parallel to the second axial direction to limit the second damping swing arm and the second synchronous swing arm from rotating in different directions. The rotating shaft mechanism according to claim 2 or 3, characterized in that the connection structure between the first damping swing arm and the first synchronous swing arm further comprises a first clamping portion and a first buckling portion, and the first clamping portion cooperates with the first buckling portion on a plane perpendicular to the first damping swing arm to limit the separation of the first damping swing arm and the first synchronous swing arm; The connection structure between the second damping swing arm and the second synchronous swing arm also includes a second clamping portion and a second buckling portion, and the second clamping portion cooperates with the second buckling portion on a plane perpendicular to the second damping swing arm to limit the separation of the second damping swing arm and the second synchronous swing arm. The rotating shaft mechanism according to any one of claims 2 to 4, characterized in that the rotating shaft mechanism further comprises an elastic member base, an elastic member, and a cam base; The elastic member base is fixed on the rotating shaft base; The cam base is in abutment with the first swing arm and the second swing arm; The elastic member is compressed between the elastic member base and the cam base, and under the elastic force of the elastic member, the sliding member fits with the first swing arm and the second swing arm. The rotating shaft mechanism according to claim 5, characterized in that the cam base is symmetrically provided with a first cam and a second cam; The first damping swing arm is provided with a first sleeve, the first cam is pressed against the first sleeve of the first damping swing arm, and the first groove is fitted with the first protrusion; The second damping swing arm is provided with a first sleeve, the second cam is pressed against the first sleeve of the second damping swing arm, and the second groove is fitted with the second protrusion. The rotating shaft mechanism according to claim 6 is characterized in that the first cam has a first concave-convex surface at one end of the first sleeve of the first damping swing arm facing the first cam, and the first concave-convex surface is pressed against the second concave-convex surface, so that the first damping swing arm rotates around the first pin shaft to generate damping. The rotating shaft mechanism according to claim 6 or 7 is characterized in that the second cam has a third concave-convex surface on one end of the first sleeve of the second damping swing arm facing the second cam, and the second damping swing arm has a fourth concave-convex surface on one end of the first sleeve facing the second cam, and the third concave-convex surface is pressed against the fourth concave-convex surface, so that the second damping swing arm rotates around the second pin shaft to generate damping. The rotating shaft mechanism according to any one of claims 5 to 8, characterized in that the elastic member comprises a first sub-elastic member and a second sub-elastic member; The first pin shaft passes through the first sleeve of the first damping swing arm and the first sub-elastic member, and the second pin shaft passes through the first sleeve of the second damping swing arm and the second sub-elastic member. The rotating shaft mechanism according to any one of claims 2 to 9, characterized in that the rotating shaft mechanism further comprises a sliding member base, a first side of the sliding member base is fixed to the rotating shaft base, and the sliding member is located on a second side of the sliding member base away from the rotating shaft base; The first pin shaft and the second pin shaft are fixed to the sliding member base; The first swing arm and the second swing arm are rotationally matched with the sliding member base. The rotating shaft mechanism according to claim 10, characterized in that the end of the first synchronous swing arm facing the sliding member base has a first limiting portion; The end of the sliding member base facing the first synchronous swing arm has a third limiting portion; The first limiting portion is in abutment with the third limiting portion to limit the first synchronous swing arm from exceeding the plane where the second side of the sliding member base is located. The rotating shaft mechanism according to claim 10 or 11, characterized in that the second synchronous swing arm has a second limiting portion at one end thereof facing the sliding member base; One end of the sliding member base facing the second synchronous swing arm has a fourth limiting portion; The second limiting portion is abutted and matched with the fourth limiting portion to limit the second synchronous swing arm from exceeding the plane where the second side of the sliding member base is located. The rotating shaft mechanism according to any one of claims 1-12 is characterized in that the first end of the first protrusion has a first spiral slope, and the second end of the first protrusion has a second spiral slope; the first side of the first groove has a third spiral slope, and the second side of the first groove has a fourth spiral slope; the first spiral slope of the first protrusion fits with the third spiral slope of the first groove, and the second spiral slope of the first protrusion fits with the fourth spiral slope of the first groove. The rotating shaft mechanism according to any one of claims 1-13 is characterized in that the first end of the second protrusion has a first spiral slope, and the second end of the second protrusion has a second spiral slope; the first side of the second groove has a third spiral slope, and the second side of the second groove has a fourth spiral slope; the first spiral slope of the second protrusion fits with the third spiral slope of the second groove, and the second spiral slope of the second protrusion fits with the fourth spiral slope of the second groove. The rotating shaft mechanism according to any one of claims 1 to 14, characterized in that the first protruding portion has a first pin hole, the first pin hole is connected through the first end and the second end of the first protruding portion, and the first pin shaft passes through the first pin hole; The second protrusion has a second pin hole, the second pin hole connects the first end and the second end of the second protrusion, and the second pin shaft passes through the second pin hole. An electronic device, characterized in that the electronic device comprises a first middle frame, a second middle frame, a flexible screen and a hinge mechanism according to any one of claims 1 to 15; The first middle frame is connected to the first swing arm in the hinge mechanism, and the second middle frame is connected to the second swing arm in the hinge mechanism; the flexible screen is fixed to the first middle frame and the second middle frame.