CN113009967B - Hinge components and electronics for foldable screens - Google Patents

Abstract

The present application discloses a hinge assembly of a foldable screen and an electronic device. The hinge assembly of a foldable screen includes: a support; a first gear rotatably arranged on the support; The connecting shaft; the second gear is rotatably arranged on the support member, the second gear meshes with the first gear, the first side of the second gear is provided with a second connecting shaft, and the second connecting shaft is relative to the axis of the second gear Eccentric setting; the movable rod is provided with a plurality of positioning grooves; the positioning slider is connected with the second connecting shaft, and the positioning slider can be engaged with the positioning grooves. In this application, the hovering function and damping feeling are realized through the cooperation of the positioning slider and the positioning groove.

Description

Hinge components and electronics for foldable screens

technical field

The present application belongs to the technical field of electronic equipment, and in particular relates to a hinge assembly of a foldable screen and electronic equipment.

Background technique

With the rapid development of smart terminals, consumers need larger screens to browse the web and watch videos. In order to meet consumer needs, larger screens are often used. At the same time, the manufacturing process of flexible AMOLED screens has matured, so terminals with foldable screens emerge in an endless stream. Various types of mobile phones on the market use flexible AMOLED screen terminals with foldable structures.

Folding screen mobile phones need to use hinges to realize the folding of the screen and related structures. In order to realize the damping feeling of the flexible screen mobile phone during the folding process and the function of hovering at any position, the existing technology generally adopts gear meshing to ensure the distance between the rotating shafts, and uses special-shaped gears to realize the damping feeling and rotation during the rotation process. Stop function, special-shaped gears need to be used with springs.

When the two gears with special-shaped teeth rotate relative to each other, the axial distance between the two gears changes and compresses the spring to produce a damping feeling. By rationally designing the angle of the special-shaped gear teeth to be smaller than the friction angle between the teeth, the frictional self-locking between the special-shaped teeth can be realized when not rotating, that is, hovering.

In the process of implementing the present application, the inventors found at least the following problems in the prior art: the bending feel and hovering of the folding screen mobile phone are realized through the mutual meshing/unlocking of the rotating gear and the fixed gear in the opposite tooth set. The structure of the heterogeneous tooth set is complex, the processing cost is high, and the structural space occupied by the heterogeneous gear and the spring is relatively large. When rotating, because each tooth on the two gears will rub against each other, the noise is relatively large.

Contents of the invention

The present application aims to provide a hinge assembly of a foldable screen and an electronic device, at least solving one of the problems in the background technology.

In order to solve the above-mentioned technical problems, the application is implemented as follows:

In the first aspect, the embodiment of the present application proposes a hinge assembly for a foldable screen, including: a support member; a first gear, the first gear is rotatably arranged on the support member, and the first gear of the first gear One side is provided with a first connecting shaft; a second gear, the second gear is rotatably arranged on the support member, the second gear meshes with the first gear, and the first side of the second gear A second connecting shaft is provided, and the second connecting shaft is eccentrically arranged with respect to the axis of the second gear; a movable rod, the first end of which is connected to the first connecting shaft and can move Rotate, the movable rod is provided with a plurality of positioning grooves, the plurality of positioning grooves include a first positioning groove and a second positioning groove; a positioning slider, the positioning slider is connected with the second connecting shaft, the The positioning slider can be snapped into the positioning groove; wherein, during the meshing and rotating process of the first gear and the second gear, the positioning slider can move along the length direction of the movable rod, and can be moved by Switch from snapping with the first positioning slot to snapping with the second positioning slot.

In a second aspect, an embodiment of the present application provides an electronic device, including the hinge assembly of a foldable screen described in any one of the above embodiments.

In the embodiment of the present application, the first connecting shaft is provided on the first side of the first gear, the second connecting shaft is provided on the first side of the second gear, and the first gear and the second gear that mesh with each other A movable rod is provided on the first side of the gear. When the first gear and the second gear rotate, the distance between the first connecting shaft and the second connecting shaft changes, and the movable rod can always be connected with the first connecting shaft and the second connecting shaft simultaneously. A plurality of positioning grooves are arranged on the movable rod, and the hovering function and damping feeling can be realized through the cooperation of the positioning slider and the positioning grooves.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a schematic diagram of a hinge structure of a foldable screen in the prior art;

Fig. 2 is a schematic diagram of a usage state of a hinge assembly of a foldable screen according to an embodiment of the present application;

Fig. 3 is a schematic diagram of another usage state of the hinge assembly of the foldable screen according to the embodiment of the present application;

Fig. 4 is a schematic diagram of a cooperation state of the first gear, the second gear, the movable rod and the positioning slider of the hinge assembly of the foldable screen according to the embodiment of the present application;

Fig. 5 is a schematic diagram of another cooperation state of the first gear, the second gear, the movable rod and the positioning slider of the hinge assembly of the foldable screen according to the embodiment of the present application;

6 is an exploded view of a positioning slider of a hinge assembly of a foldable screen according to an embodiment of the present application;

7 is a cross-sectional view of a positioning slider of a hinge assembly of a foldable screen according to an embodiment of the present application;

Fig. 8 is a schematic perspective view of a movable rod of a hinge assembly of a foldable screen according to an embodiment of the present application;

Fig. 9 is a schematic structural diagram of a second gear of a hinge assembly of a foldable screen according to an embodiment of the present application.

Reference signs:

Irregular gear 1; spring 2;

A hinge assembly 100 for a foldable screen;

support 10;

The first gear 20; the first connecting shaft 21;

The second gear 30; the second connecting shaft 31;

Active rod 40; positioning groove 41; channel 42; second shaft hole 43;

The positioning slider 50 ; the first body 51 ; the second body 52 ; the insertion rod 53 ; the elastic member 54 ; the accommodating cavity 55 ;

Detailed ways

Embodiments of the present invention will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The features of the terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

This application is an invention created by the inventor based on the following facts.

Fig. 1 shows a hinge structure of a foldable screen in the prior art.

As shown in FIG. 1 , the existing hinge structure adopts a special-shaped gear 1 and cooperates with a spring 2 for use. When the two gears of each special-shaped gear 1 rotate relative to each other, the axial distance between the two gears changes and compresses the spring.

The above hinge structure has the following defects: complex structure, high processing cost, large structural space occupied by the special-shaped gear 1 and the spring 2, and when rotating, each tooth on the two special-shaped gears 1 will rub against each other, resulting in high noise.

Based on this, the inventor of the present application has creatively obtained the following inventions through long-term research and experiments.

A hinge assembly 100 for a foldable screen according to an embodiment of the present application will be described below with reference to FIGS. 2 to 9 .

A hinge assembly 100 for a foldable screen according to an embodiment of the present application includes: a support member 10 , a first gear 20 , a second gear 30 , a movable rod 40 and a positioning slider 50 .

Specifically, the first gear 20 is rotatably arranged on the support member 10, the first side of the first gear 20 is provided with the first connecting shaft 21, the second gear 30 is rotatably arranged on the support member 10, and the second gear 30 Mesh with the first gear 20, the first side of the second gear 30 is provided with a second connecting shaft 31, the second connecting shaft 31 is arranged eccentrically with respect to the axis center of the second gear 30, the first end of the movable rod 40 is connected with the first The connecting shaft 21 is connected and rotatable around its axis, and the movable rod 40 is provided with a plurality of positioning slots 41, and the plurality of positioning slots 41 include a first positioning slot and a second positioning slot. The positioning slider 50 is connected to the second connecting shaft 31 , and the positioning slider 50 can engage with the positioning groove 41 . Wherein, during the meshing and rotating process of the first gear 20 and the second gear 30, the positioning slider 50 is movable along the length direction of the movable rod 40, and can be switched from engaging with the first positioning groove to engaging with the second positioning groove .

In other words, the hinge assembly 100 of the foldable screen according to the embodiment of the present application is mainly composed of a support 10 capable of supporting, a first gear 20 mounted on the support 10 , and a second gear mounted on the support 10 30 , a movable rod 40 connected to the first gear 20 and the second gear 30 respectively, and a positioning slider 50 movable along the length direction of the movable rod 40 . Wherein, the support member 10 can be connected with the hinge, and the hinge can be connected with the screen. The number of hinges can be two, one hinge is connected with the first gear 20 , and the other hinge is connected with the second gear 30 . The first gear 20 is engaged with the second gear 30 , the first gear 20 can rotate around its own axis, and the second gear 30 can also rotate around its own axis. As shown in FIG. 2 and FIG. 3 , when the first gear 20 and the second gear 30 move relatively, the two hinges can move relatively, and the distance between the two hinges is reduced. When the first gear 20 and the second gear 30 move in opposite directions, the two hinges can move in opposite directions, and the distance between the two hinges increases, so that the screen can be folded.

As shown in Figure 2 and Figure 3, the first gear 20 and the second gear 30 are distributed side by side, the first connecting shaft 21 is provided on the first side of the first gear 20, and the first connecting shaft 21 is provided on the first side of the second gear 30. Two connecting shafts 31 , the second connecting shaft 31 is located on the same side of the hinge assembly 100 as the first connecting shaft 21 . Taking the first gear 20 as an example, the first gear 20 can be formed as a cylindrical member, and a plurality of spaced apart teeth are arranged on the outer peripheral surface of the first gear 20, and each tooth can extend along the length direction of the first gear 20 . A first end of the first gear 20 along its length direction is defined as a first side, and a second end of the first gear 20 along its length direction is defined as a second side. The teeth can extend from the second side of the first gear 20 to the direction of the first side of the first gear 20 . Similarly, the structure of the teeth on the second gear 30 is also as described above, and will not be repeated here.

It should be noted that the second connecting shaft 31 is arranged eccentrically relative to the axis of the second gear 30 , and the positional relationship between the first connecting shaft 21 and the axis of the first gear 20 is not limited here. That is to say, the first connecting shaft 21 can be arranged concentrically with the axis of the first gear 20 , and the first connecting shaft 21 can also be arranged eccentrically with respect to the axis of the first gear 20 .

A movable lever 40 is provided on the first side of the first gear 20 and the second gear 30 . The movable rod 40 can be respectively connected with the first connecting shaft 21 and the second connecting shaft 31 . The relative relationship between the movable rod 40 and the first connecting shaft 21 and the second connecting shaft 31 will be described in the following.

case one

The first end of the movable rod 40 is connected to the second connecting shaft 31 and is rotatable around the axis of the second connecting shaft 31 . The second connecting shaft 31 is arranged eccentrically with respect to the axis of the second gear 30 , and the first connecting shaft 21 is arranged concentrically with respect to the axis of the first gear 20 . When the first gear 20 and the second gear 30 rotate relative or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 will change. And when the second gear 30 and the first gear 20 rotated, the first end of the movable rod 40 could rotate around the axis of the second connecting shaft 31, and the first connecting shaft 21 could move along the length direction of the movable rod 40 to ensure the movable The rod 40 can always be connected to the first connecting shaft 21 and the second connecting shaft 31 .

case two

The first end of the movable rod 40 is connected to the second connecting shaft 31 and is rotatable around the axis of the second connecting shaft 31 . The second connecting shaft 31 is arranged eccentrically relative to the axis of the second gear 30 , and the first connecting shaft 21 is arranged eccentrically relative to the axis of the first gear 20 . When the first gear 20 and the second gear 30 rotate relative or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 will change. When the second gear 30 and the first gear 20 rotate, the first end of the movable rod 40 can rotate around the axis of the second connecting shaft 31 , and the first connecting shaft 21 can move along the length direction of the movable rod 40 .

Case three

The first end of the movable rod 40 is connected to the first connecting shaft 21 and can rotate around the axis of the first connecting shaft 21 . The first connecting shaft 21 is arranged concentrically with respect to the axis of the first gear 20 , and the second connecting shaft 31 is arranged eccentrically with respect to the axis of the second gear 30 . When the first gear 20 and the second gear 30 rotate relative or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 will change. And when the second gear 30 and the first gear 20 rotated, the first end of the movable rod 40 could rotate around the axis of the first connecting shaft 21, and the second connecting shaft 31 could move along the length direction of the movable rod 40, ensuring The movable rod 40 can always be connected with the first connecting shaft 21 and the second connecting shaft 31 .

Situation four

The first end of the movable rod 40 is connected to the first connecting shaft 21 and can rotate around the axis of the first connecting shaft 21 . The first connecting shaft 21 is arranged eccentrically relative to the axis of the first gear 20 , and the second connecting shaft 31 is arranged eccentrically relative to the axis of the second gear 30 . When the first gear 20 and the second gear 30 rotate relative or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 will change. When the first gear 20 and the second gear 30 rotate, the first end of the movable rod 40 can rotate around the axis of the first connecting shaft 21 , and the second connecting shaft 31 can move along the length direction of the movable rod 40 .

In addition, in order to realize the hovering function and damping feeling when the user operates the foldable screen, the movable rod 40 is provided with a plurality of positioning grooves 41 arranged at intervals along its length direction. The plurality of positioning grooves 41 include a first positioning groove and a first positioning groove. Second positioning slot. When the first end of the movable rod 40 is connected with the first connecting shaft 21, the positioning slider 50 is connected with the second connecting shaft 31, and when the second connecting shaft 31 moves along the length direction of the movable rod 40, the positioning slider 50 It can move along the length direction of the movable rod 40 synchronously. When the first end of the movable rod 40 is connected with the second connecting shaft 31, the positioning slider 50 is connected with the first connecting shaft 21, and when the first connecting shaft 21 moves along the length direction of the movable rod 40, the positioning slider 50 It can move along the length direction of the movable rod 40 synchronously.

As shown in Fig. 4 and Fig. 5, when the first gear 20 and the second gear 30 stop relative movement, the positioning slider 50 can engage with the first positioning slot and will not move to the position of the second positioning slot, realizing Hover functionality. When driving the first gear 20 and the second gear 30 to move, the positioning slider 50 can move along the length direction of the movable rod 40, and the positioning slider 50 can move from the first positioning groove to the second positioning groove, realizing damping feel.

Therefore, according to the hinge assembly 100 of the foldable screen according to the embodiment of the present application, the first connecting shaft 21 is arranged on the first side of the first gear 20 , and the second connecting shaft is arranged on the first side of the second gear 30 31, and a movable rod 40 is provided on the first side of the first gear 20 and the second gear 30 meshing with each other. When the first gear 20 and the second gear 30 rotate, the distance between the first connecting shaft 21 and the second connecting shaft 31 changes, and the movable rod 40 can always be connected with the first connecting shaft 21 and the second connecting shaft 31 at the same time. . A plurality of positioning grooves 41 are provided on the movable rod 40 , and the hovering function and damping feeling can be realized through the cooperation of the positioning slider 50 and the positioning grooves 41 .

According to one embodiment of the present application, as shown in Figures 2 and 3, the support 10 is connected with the foldable screen, and the first side of the first gear 20 is flush with the first side of the second gear 30, which facilitates installation activities The rod 40 can simplify the structure of the movable rod 40 . The second side of the first gear 20 and the second side of the second gear 30 are respectively movably connected with the support member 10 . Specifically, holes may be provided in the support member 10 , and the second side of the first gear 20 and the second side of the second gear 30 may be plugged into corresponding holes respectively.

Optionally, as shown in Fig. 4, Fig. 5 and Fig. 8, the movable rod 40 is provided with a channel 42 extending along its own length direction, and the two sides of the channel 42 in the length direction are respectively provided with positioning grooves 41 corresponding to the positions for positioning Both sides of the slider 50 are matched with the positioning slots 41 respectively. For ease of description, the length direction of the movable rod 40 in FIG. 8 is defined as the left-right direction, and the width direction of the movable rod 40 is defined as the front-rear direction. It can be seen that the channel 42 extends along the left and right directions, and a plurality of positioning grooves 41 are provided on the front and rear sides of the channel 42 . When the positioning slider 50 moves in the left and right direction, the front and rear sides of the positioning slider 50 can extend into the corresponding positioning groove 41 .

In some specific embodiments of the present application, as shown in FIG. 8 , each positioning groove 41 is an arc-shaped groove, and the transition between two adjacent positioning grooves 41 is smooth, and a plurality of positioning grooves 41 form a wave-shaped structure. The slot 41 can be a damping slot and serves as a gear. This structure is beneficial to make the positioning slider 50 move from the current positioning slot 41 to the next positioning slot 41, so as to prevent the positioning slider 50 from being stuck in a certain positioning slot 41 and reduce user experience.

In some specific embodiments of the present application, when the positioning slider 50 is installed on the first connecting shaft 21 , the positioning slider 50 can rotate relative to the first connecting shaft 21 . When the positioning slider 50 is installed on the second connecting shaft 31 , the positioning slider 50 can rotate relative to the second connecting shaft 31 . By adopting a rotatable form, the movement of the rectangular positioning slider 50 along the channel 42 is facilitated.

According to an embodiment of the present application, as shown in FIGS. 6 and 7 , the positioning slider 50 includes: a first body 51 , a second body 52 and two insertion rods 53 . Specifically, the first body 51 is provided with a first shaft hole 57 , and the second connecting shaft 31 is inserted into the first shaft hole 57 .

As shown in FIG. 7 , the second body 52 is connected to the first body 51 , and there is an accommodating chamber 55 extending along the width direction of the channel 42 between the second body 52 and the first body 51 . The first end of each insertion rod 53 is inserted into the receiving cavity 55 , and the second end of each insertion rod 53 fits into the positioning groove 41 . That is to say, when the positioning slider 50 slides along the channel 42 , the second end of the insertion rod 53 can move from the first positioning slot to the second positioning slot.

It should be noted that the relative relationship between the insertion rod 53 and the first body 51 and the second body 52 includes but not limited to the above structure. For example, the first body 51 and the second body 52 are integrally formed. The number of the insertion rod 53 can be one or two. When the number of the insertion rod 53 is one, one end of the insertion rod 53 can be connected with the first body 51, and the other end of the insertion rod 53 can be inserted into the corresponding positioning groove 41 Inside. When the number of insertion rods 53 is two, the two insertion rods 53 can be plugged into the corresponding positioning slots 41 respectively, which can increase the balance and consistency of the damping force received by the user when folding the screen.

Optionally, as shown in FIG. 6 and FIG. 7 , the positioning slider 50 further includes an elastic member 54, the elastic member 54 is arranged in the accommodating cavity 55, and is located between the two insertion rods 53, and the two ends of the elastic member 54 are respectively connected to The first ends of the two insertion rods 53 are connected. When the insertion rod 53 moves from the first positioning groove to the second positioning groove, the insertion rod 53 squeezes the elastic member 54, and the elastic member 54 deforms and shrinks. When the insertion rod 53 moves to the position of the second positioning groove, the elastic The member 54 is extended, and the insertion rod 53 is inserted into the second positioning slot. During the movement of the inserting rod 53 , it is subjected to the frictional force and the push force of the elastic member 54 . By arranging the elastic member 54, not only the positioning effect when the insertion rod 53 is located in the positioning groove 41 can be improved, the hovering function can be optimized, but also the damping force received by the insertion rod 53 when it moves between the first positioning groove and the second positioning groove can be increased. .

In some specific embodiments of the present application, the two ends of the accommodating cavity 55 are respectively provided with limiting bosses 56 that restrict the insertion rod 53 from detaching from the accommodating cavity 55, which can limit the range of motion of the insertion rod 53 and prevent the insertion rod 53 from moving during the movement process. Wherein it is separated from the positioning slider 50.

In some specific embodiments of the present application, the first end of the movable rod 40 is provided with a second shaft hole 43 , and the first connecting shaft 21 is inserted into the second shaft hole 43 . Specifically, the first end of the movable rod 40 is provided with a second rotating shaft hole 43 extending along its thickness direction, and the first connecting shaft 21 can be inserted into the second rotating shaft hole 43, so that the first end of the movable rod 40 can Rotate around the axis of the first connecting shaft 21 , so that the second end of the movable rod 40 can rotate around the first end of the movable rod 40 .

According to an embodiment of the present application, the first connecting shaft 21 is arranged eccentrically with respect to the axis center of the first gear 20, that is to say, the first connecting shaft 21 and the second connecting shaft 31 are both eccentric structures, and the first gear 20 When moving with the second gear 30, the maximum distance between the first connecting shaft 21 and the second connecting shaft 31 can be increased, thereby enlarging the folding angle of the foldable screen.

According to the hinge assembly 100 of the foldable screen according to the embodiment of the present application, the first connecting shaft 21 is provided on the first side of the first gear 20 , the second connecting shaft 31 is provided on the first side of the second gear 30 , and A movable lever 40 is provided on the first side of the first gear 20 and the first side of the second gear 30 . When the user folds or opens the screen, the first gear 20 and the second gear 30 rotate, driving the movable rod 40 and the positioning slider 50 to rotate. During the rotation process of the first connecting shaft 21 and the second connecting shaft 31 , the distance changes, which realizes the linear movement of the positioning slider 50 in the channel 42 . And by setting the positioning groove 41 in the channel 42, when the positioning slider 50 moves linearly in the channel 42, when the positioning slider 50 moves from the first positioning groove to the second positioning groove, it is compressed by the elastic member 54. and friction force to realize the hovering function; when the force applied by the user is sufficient to overcome the above-mentioned resistance, the movable rod 40 and the positioning slider 50 continue to move relative to each other, and the positioning slider 50 enters the second positioning groove from the first positioning groove, realizing Damped feel. The hinge assembly 100 of the foldable screen of the present application has the advantages of simple structure, easy processing, and less space occupation.

According to an embodiment of the present application, an electronic device is also provided, including the hinge assembly 100 of the foldable screen in any of the above embodiments, the hinge assembly 100 of the foldable screen can be connected to the foldable screen of the electronic device through a hinge, and then Realize the control of the stretching and folding of the foldable screen.

The electronic device according to the embodiment of the present invention may be a smart phone, a tablet computer, a wearable device, etc., which is not limited herein.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A hinge assembly for a foldable screen, comprising:

a support;

the first gear is rotatably arranged on the supporting piece, and a first connecting shaft is arranged on the first side of the first gear;

the second gear is rotatably arranged on the supporting piece, the second gear is meshed with the first gear, a second connecting shaft is arranged on the first side of the second gear, and the second connecting shaft is eccentrically arranged relative to the axis of the second gear;

the first end of the movable rod is connected with the first connecting shaft and can rotate around the axis of the movable rod, the movable rod is provided with a plurality of positioning grooves which are arranged at intervals along the length direction of the movable rod, and the plurality of positioning grooves comprise a first positioning groove and a second positioning groove;

the positioning sliding block is connected with the second connecting shaft and can be clamped with the positioning groove;

and in the process of meshing and rotating the first gear and the second gear, the positioning sliding block can move along the length direction of the movable rod and can be switched from being clamped with the first positioning groove to being clamped with the second positioning groove.

2. The foldable screen hinge assembly of claim 1, wherein the support is coupled to the foldable screen, the first side of the first gear is flush with the first side of the second gear, and the second side of the first gear and the second side of the second gear are each movably coupled to the support.

3. The hinge assembly of a foldable screen according to claim 1, wherein the movable rod is provided with a channel extending along a length direction thereof, the two sides of the channel in the length direction are respectively provided with the positioning grooves corresponding in position, and the two sides of the positioning slide block are respectively matched with the positioning grooves.

4. A hinge assembly for a foldable screen according to claim 3, wherein each of the positioning grooves is an arc-shaped groove, and two adjacent positioning grooves are smoothly transited.

5. The foldable screen hinge assembly of claim 4, wherein the positioning slider comprises:

the first body is provided with a first rotating shaft hole, and the second connecting shaft is inserted into the first rotating shaft hole;

the second body is connected with the first body, and a containing cavity extending along the width direction of the channel is arranged between the second body and the first body;

the two inserting rods are respectively arranged at two ends of the accommodating cavity, the first end of each inserting rod is inserted into the accommodating cavity, and the second end of each inserting rod is matched with the positioning groove.

6. The foldable screen hinge assembly of claim 5, wherein the positioning slider further comprises:

the elastic piece is arranged in the accommodating cavity and positioned between the two inserting rods, and two ends of the elastic piece are respectively connected with the first ends of the two inserting rods.

7. The hinge assembly of claim 5, wherein the two ends of the receiving chamber are respectively provided with a limit boss for limiting the plunger from being separated from the receiving chamber.

8. The foldable screen hinge assembly of claim 1, wherein the first end of the movable bar is provided with a second pivot hole, and the first connecting shaft is inserted into the second pivot hole.

9. The foldable screen hinge assembly of claim 1, wherein the first connecting shaft is disposed eccentrically with respect to an axis of the first gear.

10. An electronic device comprising the hinge assembly of the foldable screen of any one of claims 1-9.

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