CN113009967A

CN113009967A - Hinge assembly of foldable screen and electronic device

Info

Publication number: CN113009967A
Application number: CN202110242619.3A
Authority: CN
Inventors: 周全; 梁志刚
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-06-22
Anticipated expiration: 2041-03-04
Also published as: CN113009967B

Abstract

The application discloses hinge subassembly and electronic equipment of collapsible screen, the hinge subassembly of collapsible screen includes: a support member; 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 and 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 movable rod is provided with a plurality of positioning grooves; and the positioning sliding block is connected with the second connecting shaft and can be clamped with the positioning groove. This application cooperatees through location slider and constant head tank, realizes hovering function and damping sense.

Description

Hinge assembly of foldable screen and electronic device

Technical Field

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

Background

With the rapid development of intelligent terminals, consumers need larger screens to browse webpages and watch videos, and screens with larger sizes are often adopted to meet the requirements of the consumers. Meanwhile, the manufacturing process of the flexible AMOLED screen is mature, so that the terminals of the foldable screen are diversified, and the flexible AMOLED screen terminal with the foldable structure is adopted by mobile phones of various models in the market.

Folding screen mobile phones require the use of hinges to achieve folding of the screen and related structures. In order to realize the damping sense and the hovering function at any position of the flexible screen mobile phone in the folding process, the prior art generally adopts gear meshing to ensure the distance between rotating shafts, and adopts a special-shaped gear to realize the damping sense and the rotation stopping function in the rotating process, and the special-shaped gear needs to be matched with a spring for use.

When the two gears of the special-shaped teeth rotate relatively, the axial distance between the two gears is changed and the spring is compressed, so that the damping feeling is generated. Through the reasonable design that the angle of the special-shaped gear teeth is smaller than the friction angle between the teeth, the friction self-locking, namely hovering, between the special-shaped teeth can be realized when the special-shaped gear teeth do not rotate.

In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art: the bending hand feeling and hovering of the folding screen mobile phone are realized by mutually meshing and unlocking a rotating gear and a fixed gear in the opposite-shaped tooth group. The special-shaped gear set has a complex structure and high processing cost, and the special-shaped gear and the spring occupy a larger structural space. When the gear is rotated, each tooth on the two gears can rub against each other, so that the noise is high.

Disclosure of Invention

The present application is directed to a hinge assembly of a foldable screen and an electronic device that solve at least one of the problems of the related art.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a hinge assembly of a foldable screen, including: a support member; 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 and 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 first connecting shaft, the movable rod is provided with a plurality of positioning grooves, 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; in the process that the first gear and the second gear are meshed and rotated, the positioning sliding block can move along the length direction of the movable rod and can be switched to be clamped with the second positioning groove by being clamped with the first positioning groove.

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

In the embodiment of the present application, a first connecting shaft is provided on a first side of a first gear, a second connecting shaft is provided on a first side of a second gear, and a movable rod is provided on a first side of the first gear and the second gear which are engaged with each other. When first gear and second gear rotate, the distance between first connecting axle and the second connecting axle changes, and the movable rod can be connected with first connecting axle and second connecting axle simultaneously all the time. Be equipped with a plurality of constant head tanks on the movable rod, cooperate with the constant head tank through location slider, can realize hovering function and damping and feel.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

FIG. 2 is a schematic view of one state of use of a hinge assembly of a foldable screen according to an embodiment of the present application;

FIG. 3 is a schematic view of yet another state of use of a hinge assembly of a foldable screen according to an embodiment of the present application;

FIG. 4 is a schematic view of one mating state of a first gear, a second gear, a movable bar and a positioning slider of a hinge assembly of a foldable screen according to an embodiment of the present application;

FIG. 5 is a schematic view of yet another mating state of a first gear, a second gear, a movable bar, and a positioning slider of a hinge assembly of a foldable screen according to an embodiment of the present application;

FIG. 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;

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

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

Reference numerals:

a special-shaped gear 1; a spring 2;

a hinge assembly 100 of a foldable screen;

a support 10;

a first gear 20; a first connecting shaft 21;

a second gear 30; a second connecting shaft 31;

a movable lever 40; a positioning groove 41; a channel 42; a second rotation shaft hole 43;

a positioning slide block 50; a first body 51; a second body 52; an insert rod 53; an elastic member 54; a housing cavity 55; a limit boss 56; first spindle bore 57.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present application is an invention made by the inventors 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 conventional hinge structure uses a shaped gear 1 in cooperation with a spring 2. When the two gears of each special-shaped gear 1 rotate relatively, the axial distance between the two gears changes and the spring is compressed.

The hinge structure as above has the following disadvantages: the structure is complicated, and the processing cost is high, and the structural space that dysmorphism gear 1 and spring 2 occupy is great, during the rotation, because every tooth on two dysmorphism gears 1 all can the looks mutual friction, leads to the noise great.

Based on this, the inventors of the present application have conducted long-term studies and experiments to creatively develop the following inventions.

A hinge assembly 100 of a foldable screen according to an embodiment of the present application is described below with reference to fig. 2 to 9.

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

Specifically, the first gear 20 is rotatably disposed on the support 10, the first side of the first gear 20 is provided with a first connecting shaft 21, the second gear 30 is rotatably disposed on the support 10, the second gear 30 is engaged 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 eccentrically disposed with respect to the axis of the second gear 30, the first end of the movable rod 40 is connected with the first connecting shaft 21 and is rotatable around the axis thereof, the movable rod 40 is provided with a plurality of positioning grooves 41, and the plurality of positioning grooves 41 include a first positioning groove and a second positioning groove. The positioning slide block 50 is connected with the second connecting shaft 31, and the positioning slide block 50 can be clamped with the positioning groove 41. In the process of the engagement rotation 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 to be in clamping connection with the second positioning groove by being in clamping connection with the first 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, a second gear 30 mounted on the support 10, a movable bar 40 respectively connected to the first gear 20 and the second gear 30, and a positioning slider 50 movable along a length direction of the movable bar 40. Wherein the support member 10 may be connected to a hinge, which may be connected to a screen. The number of hinges may be two, one hinge being connected to the first gear 20 and the other hinge being connected to the second gear 30. The first gear 20 is in meshing connection with the second gear 30, the first gear 20 is rotatable about its own axis, and the second gear 30 is also rotatable about its own axis. As shown in fig. 2 and 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 away from each other, the two hinges can move away from each other, and the distance between the two hinges is increased, so that the screen can be folded.

As shown in fig. 2 and 3, the first gear 20 and the second gear 30 are arranged side by side, a first connecting shaft 21 is disposed on a first side of the first gear 20, a second connecting shaft 31 is disposed on a first side of the second gear 30, and the second connecting shaft 31 and the first connecting shaft 21 are located on the same side of the hinge assembly 100. Taking the first gear 20 as an example, the first gear 20 may be formed as a cylindrical member, and a plurality of teeth distributed at intervals are provided on an outer circumferential surface of the first gear 20, and each tooth may extend in a length direction of the first gear 20. A first end of the first gear 20 in its length direction is defined as a first side and a second end of the first gear 20 in its length direction is defined as a second side. The teeth can extend from the second side of the first gear 20 in a direction toward 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 described herein.

Note that the second connecting shaft 31 is disposed eccentrically with respect to the axial center of the second gear 30, and the positional relationship between the first connecting shaft 21 and the axial center of the first gear 20 is not limited herein. That is, the first connecting shaft 21 may be disposed concentrically with the axial center of the first gear 20, and the first connecting shaft 21 may be disposed eccentrically with respect to the axial center of the first gear 20.

A movable lever 40 is provided at a first side of the first gear 20 and the second gear 30. The movable lever 40 can be connected to the first connecting shaft 21 and the second connecting shaft 31, respectively. The relative relationship between the movable lever 40 and the first and second connecting

shafts

21 and 31 will be described in each case.

Situation one

The first end of the movable lever 40 is connected to the second connecting shaft 31 and is rotatable about the axis of the second connecting shaft 31. The second connecting shaft 31 is disposed eccentrically with respect to the axial center of the second gear 30, and the first connecting shaft 21 is disposed concentrically with respect to the axial center of the first gear 20. When the first gear 20 and the second gear 30 rotate relatively or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 changes. 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, the first connecting shaft 21 can move along the length direction of the movable rod 40, and the movable rod 40 can be always connected with the first connecting shaft 21 and the second connecting shaft 31.

Situation two

The first end of the movable lever 40 is connected to the second connecting shaft 31 and is rotatable about the axis of the second connecting shaft 31. The second connecting shaft 31 is disposed eccentrically with respect to the axial center of the second gear 30, and the first connecting shaft 21 is disposed eccentrically with respect to the axial center of the first gear 20. When the first gear 20 and the second gear 30 rotate relatively or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 changes. When the second gear 30 and the first gear 20 rotate, the first end of the movable lever 40 can rotate about the axis of the second connection shaft 31, and the first connection shaft 21 can move in the longitudinal direction of the movable lever 40.

Situation three

The first end of the movable lever 40 is connected to the first connecting shaft 21 and is rotatable about the axis of the first connecting shaft 21. The first connecting shaft 21 is disposed concentrically with the axis of the first gear 20, and the second connecting shaft 31 is disposed eccentrically with respect to the axis of the second gear 30. When the first gear 20 and the second gear 30 rotate relatively or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 changes. 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 first connecting shaft 21, and the second connecting shaft 31 can move along the length direction of the movable rod 40, so that the movable rod 40 can be always connected with the first connecting shaft 21 and the second connecting shaft 31.

Situation four

The first end of the movable lever 40 is connected to the first connecting shaft 21 and is rotatable about the axis of the first connecting shaft 21. The first connecting shaft 21 is disposed eccentrically with respect to the axial center of the first gear 20, and the second connecting shaft 31 is disposed eccentrically with respect to the axial center of the second gear 30. When the first gear 20 and the second gear 30 rotate relatively or oppositely, the distance between the first connecting shaft 21 and the second connecting shaft 31 changes. When the first gear 20 and the second gear 30 rotate, the first end of the movable lever 40 can rotate about the axis of the first connecting shaft 21, and the second connecting shaft 31 can move in the longitudinal direction of the movable lever 40.

Further, in order to realize a hovering function and a damping feeling when the user operates the foldable screen, a plurality of positioning grooves 41 are provided on the movable lever 40 at intervals along a length direction thereof, and the plurality of positioning grooves 41 include a first positioning groove and a second positioning groove. When the first end of the movable rod 40 is connected to the first connecting shaft 21, the positioning slider 50 is connected to 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 can move along the length direction of the movable rod 40 in synchronization. When the first end of the movable rod 40 is connected to the second connecting shaft 31, the positioning slider 50 is connected to the first connecting shaft 21, and when the first connecting shaft 21 moves along the longitudinal direction of the movable rod 40, the positioning slider 50 can move along the longitudinal direction of the movable rod 40 in synchronization.

As shown in fig. 4 and 5, when the first gear 20 and the second gear 30 stop moving relatively, the positioning slider 50 can be engaged with the first positioning groove and cannot move to the position of the second positioning groove, so that the hovering function is realized. And when the first gear 20 and the second gear 30 are driven to move, the positioning slide block 50 can move along the length direction of the movable rod 40, and the positioning slide block 50 can move from the first positioning groove to the second positioning groove, so that the damping feeling is realized.

Thus, according to the hinge assembly 100 of the foldable screen of the embodiment of the present application, by providing the first connecting shaft 21 at the first side of the first gear 20, the second connecting shaft 31 at the first side of the second gear 30, and the movable lever 40 at the first sides of the first gear 20 and the second gear 30 engaged 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 be always connected to the first connecting shaft 21 and the second connecting shaft 31 at the same time. The movable rod 40 is provided with a plurality of positioning grooves 41, and the hovering function and the damping feeling can be realized by matching the positioning slide block 50 with the positioning grooves 41.

According to an embodiment of the present application, as shown in fig. 2 and 3, the support 10 is coupled to 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 the installation of the movable bar 40, enabling the simplification of the structure of the movable bar 40. The second side of the first gear 20 and the second side of the second gear 30 are movably connected with the support 10, respectively. Specifically, holes may be provided in the support 10, and the second side of the first gear 20 and the second side of the second gear 30 may be inserted into the corresponding holes, respectively.

Alternatively, as shown in fig. 4, 5 and 8, the movable rod 40 is provided with a channel 42 extending along the length direction thereof, the channel 42 is provided with positioning grooves 41 at two sides of the length direction, and the two sides of the positioning slide block 50 are respectively matched with the positioning grooves 41. For convenience of description, the length direction of the movable lever 40 in fig. 8 is defined as a left-right direction, and the width direction of the movable lever 40 is defined as a front-rear direction. It can be seen that the channel 42 extends in the left-right direction, and a plurality of positioning grooves 41 are provided on both the front and rear sides of the channel 42. When the positioning slide block 50 moves in the left-right direction, the front and rear sides of the positioning slide block 50 can extend into the corresponding positioning grooves 41.

In some embodiments of the present application, as shown in fig. 8, each positioning groove 41 is an arc-shaped groove, two adjacent positioning grooves 41 are in smooth transition, the plurality of positioning grooves 41 form a wave-shaped structure, and the positioning groove 41 can be a damping groove and serves as a gear. This structure is favorable to making location slider 50 from current constant head tank 41 activity to next constant head tank 41, avoids location slider 50 card in a certain constant head tank 41, reduces user's use and experiences.

In some embodiments of the present application, the positioning slider 50 is rotatable with respect to the first connecting shaft 21 when the positioning slider 50 is mounted on the first connecting shaft 21. When the positioning slider 50 is mounted on the second connecting shaft 31, the positioning slider 50 is rotatable with respect to the second connecting shaft 31. The use of a rotatable version facilitates the movement of the rectangular positioning slide 50 along the channel 42.

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

As shown in fig. 7, the second body 52 is connected to the first body 51, and a receiving cavity 55 extending along the width direction of the channel 42 is disposed between the second body 52 and the first body 51, two insertion rods 53 are respectively disposed at two ends of the receiving cavity 55, a first end of each insertion rod 53 is inserted into the receiving cavity 55, and a second end of each insertion rod 53 is engaged with the positioning slot 41. That is, the second end of the plunger 53 is movable from within the first detent into the second detent as the positioning block 50 slides along the channel 42.

It should be noted that the relative relationship between the inserted rod 53 and the first body 51 and the second body 52 includes, but is 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 rods 53 may be one or two, and when the number of the insertion rods 53 is one, one end of the insertion rod 53 may be connected to the first body 51, and the other end of the insertion rod 53 may be inserted into the corresponding positioning groove 41. When the number of the insert rods 53 is two, the two insert rods 53 can be respectively inserted into the corresponding positioning grooves 41, so that the balance and consistency of the damping force received when the user folds the screen can be increased.

Optionally, as shown in fig. 6 and 7, the positioning slider 50 further includes an elastic member 54, the elastic member 54 is disposed in the accommodating cavity 55 and located between the two insertion rods 53, and two ends of the elastic member 54 are respectively connected with the first ends of the two insertion rods 53. When the insertion rod 53 moves from the first positioning groove to the second positioning groove, the insertion rod 53 presses the elastic member 54, the elastic member 54 deforms and contracts, and when the insertion rod 53 moves to the position of the second positioning groove, the elastic member 54 extends, and the insertion rod 53 is inserted into the second positioning groove. During the movement of the plunger 53, friction force and urging force of the elastic member 54 are applied. Through setting up elastic component 54, not only can improve the location effect when inserted bar 53 is located constant head tank 41, optimize the function of hovering, can also increase the damping force that inserted bar 53 received when moving between first constant head tank and second constant head tank.

In some embodiments of the present application, the two ends of the accommodating cavity 55 are respectively provided with a limiting boss 56 for limiting the insertion rod 53 to be separated from the accommodating cavity 55, so that the moving range of the insertion rod 53 can be limited, and the insertion rod 53 is prevented from being separated from the positioning slider 50 in the moving process.

In some embodiments of the present application, the first end of the movable lever 40 is provided with a second rotation shaft hole 43, and the first connection shaft 21 is inserted into the second rotation shaft hole 43. Specifically, a second rotation shaft hole 43 extending in the thickness direction of the movable lever 40 is provided at the first end thereof, and the first connecting shaft 21 is insertable into the second rotation shaft hole 43, so that the first end of the movable lever 40 can rotate about the axis of the first connecting shaft 21, and the second end of the movable lever 40 can rotate about the first end of the movable lever 40.

According to an embodiment of the present application, the first connecting shaft 21 is eccentrically disposed with respect to the axial center of the first gear 20, that is, the first connecting shaft 21 and the second connecting shaft 31 are both eccentrically configured, so that when the first gear 20 and the second gear 30 move, the maximum distance between the first connecting shaft 21 and the second connecting shaft 31 can be increased, and thus the folding angle of the foldable screen is increased.

According to the hinge assembly 100 of the foldable screen of the embodiment of the present application, by providing the first connecting shaft 21 at the first side of the first gear 20, the second connecting shaft 31 at the first side of the second gear 30, and the movable lever 40 at the first side of the first gear 20 and the first side of the second gear 30. When the user folds or unfolds the screen, the first gear 20 and the second gear 30 rotate, which rotates the movable bar 40 and the positioning slider 50. During the rotation of the first connecting shaft 21 and the second connecting shaft 31, the distance changes, and the positioning slider 50 is linearly moved in the channel 42. By arranging the positioning groove 41 in the channel 42, when the positioning slide block 50 moves linearly in the channel 42 and moves from the first positioning groove to the second positioning groove, the positioning slide block 50 is pressed by the elastic piece 54 to realize the hovering function; when the acting force applied by the user is enough to overcome the resistance, the movable rod 40 and the positioning slide block 50 continue to move relatively, and the positioning slide block 50 enters the second positioning groove from the first positioning groove, so that the damping hand feeling is realized. The hinge assembly 100 of the foldable screen of the present application has advantages of simple structure, easy processing, small occupied space, etc.

According to an embodiment of the present application, there is further provided an electronic device, including the hinge assembly 100 of the foldable screen of any of the above embodiments, the hinge assembly 100 of the foldable screen may be connected to the foldable screen of the electronic device through a hinge, so as to control the telescopic 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, and the like, which is not limited herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

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

a support member;

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 and 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 first connecting shaft, the movable rod is provided with a plurality of positioning grooves, 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;

in the process that the first gear and the second gear are meshed and rotated, the positioning sliding block can move along the length direction of the movable rod and can be switched to be clamped with the second positioning groove by being clamped with the first 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 of claim 1, wherein said movable rod is provided with a channel extending along its length direction, said channel is provided with said positioning grooves at corresponding positions on both sides of the length direction, and both sides of said positioning slider are respectively engaged with said positioning grooves.

4. A hinge assembly for a foldable screen according to claim 3, wherein each of said positioning slots is an arc-shaped slot with a smooth transition between adjacent ones of said positioning slots.

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 in the first rotating shaft hole;

the second body is connected with the first body, and an accommodating 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 located between the two insertion rods, and two ends of the elastic piece are connected with the first ends of the two insertion rods respectively.

7. The hinge assembly of a foldable screen of claim 5, wherein both ends of the receiving cavity are respectively provided with a limit boss for limiting the insertion rod to be separated from the receiving cavity.

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

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

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