CN113009967B

CN113009967B - Hinge assembly of foldable screen and electronic equipment

Info

Publication number: CN113009967B
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: 2023-04-25
Anticipated expiration: 2041-03-04
Also published as: CN113009967A

Abstract

The application discloses hinge assembly and electronic equipment of collapsible screen, hinge assembly of collapsible screen includes: 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 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. According to the suspension device, the positioning sliding block is matched with the positioning groove, so that a suspension function and a damping sense are realized.

Description

Hinge assembly of foldable screen and electronic equipment

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 web pages and watch videos, and in order to meet the demands of consumers, larger-sized screens are often adopted. Meanwhile, the manufacturing process of the flexible AMOLED screen is mature, so that the terminal layer of the folding screen is endless, and the flexible AMOLED screen terminal with the folding structure is adopted by various types of mobile phones on the market.

The folding screen mobile phone needs to use a hinge to realize the folding of the screen and related structures. In order to realize the damping sense and the function of hovering 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 special gears to realize the damping sense and the rotation stopping function in the rotating process, and the special gears are required to be matched with springs for use.

When the two gears of the special-shaped teeth rotate relatively, the axial distance between the two gears changes and compresses the spring, so that damping sense is generated. By reasonably designing that the angle of the special-shaped gear teeth is smaller than the friction angle between the teeth, 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/unlocking a rotating gear and a fixed gear in the opposite tooth group. The special-shaped gear set has the advantages of complex structure, high processing cost and larger structural space occupied by the special-shaped gear and the spring. During rotation, each tooth on the two gears can rub against each other, so that noise is high.

Disclosure of Invention

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

In order to solve the technical problems, the application is realized as follows:

in a first aspect, embodiments of the present application provide a hinge assembly for a foldable screen, including: 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, 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.

In a second aspect, an embodiment of the present application proposes an electronic device, including a hinge assembly of a foldable screen according to any one of the embodiments above.

In an embodiment of the application, the first connecting shaft is arranged on the first side of the first gear, the second connecting shaft is arranged on the first side of the second gear, and the movable rod is arranged on the first side of the first gear and the first side of the second gear which are meshed with each other. 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 be always connected with the first connecting shaft and the second connecting shaft at the same time. A plurality of positioning grooves are formed in the movable rod, and the positioning sliding blocks are matched with the positioning grooves, so that a hovering function and a damping sense can be realized.

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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

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

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

FIG. 4 is a schematic view of one mated 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 mated 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 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 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 for a foldable screen;

a support member 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;

positioning a slider 50; a first body 51; a second body 52; a plunger 53; an elastic member 54; a housing chamber 55; a limit boss 56; a first rotation shaft hole 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 or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The present application is an invention creation 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 adopts a special gear 1 and is used 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 drawbacks: the structure is complicated, and processing cost is high, and the structural space that special-shaped gear 1 and spring 2 occupy is great, and during the rotation, because every tooth on two special-shaped gears 1 all can rub each other, leads to the noise great.

Based on this, the inventors of the present application have made the following inventive inventions through long-term studies and experiments.

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 the embodiment of the present application includes: the support 10, the first gear 20, the second gear 30, the movable lever 40 and the positioning slider 50.

Specifically, the first gear 20 is rotatably disposed on the support 10, a 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 meshed with the first gear 20, a 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 an axis of the second gear 30, a first end of the movable rod 40 is connected with the first connecting shaft 21 and rotatable around an 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. During the process of meshing 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 from being clamped with the first positioning slot to being clamped with the second positioning slot.

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 connected to the first gear 20 and the second gear 30, respectively, and a positioning slider 50 capable of being movable along the length direction of the movable bar 40. Wherein the support 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 meshed connection with the second gear 30, the first gear 20 being rotatable about its own axis, and the second gear 30 being rotatable about its own axis. As shown in fig. 2 and 3, when the first gear 20 and the second gear 30 are relatively moved, the two hinges can be relatively moved, and the distance between the two hinges is reduced. When the first gear 20 and the second gear 30 move in opposition, the two hinges can move in opposition, and the distance between the two hinges increases, so that folding of the screen can be achieved.

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 provided at a first side of the first gear 20, a second connecting shaft 31 is provided at a first side of the second gear 30, and the second connecting shaft 31 and the first connecting shaft 21 are located at 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 spaced apart from each other are provided on an outer circumferential surface of the first gear 20, each of which can extend in a length direction of the first gear 20. A first end of the first gear 20 in the length direction thereof is defined as a first side, and a second end of the first gear 20 in the length direction thereof is defined as a second side. The teeth can extend from the second side of the first gear 20 to the direction in which the first side of the first gear 20 is located. Likewise, the structure of the teeth on the second gear 30 is also as described above and will not be described in detail herein.

The second connecting shaft 31 is disposed eccentrically with respect 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 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 bar 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 connection shaft 21 and the second connection shaft 31, respectively. The following describes the relative relationship between the movable lever 40 and the first and second connecting

shafts

21 and 31.

Case 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 axis of the second gear 30, and the first connecting shaft 21 is disposed concentrically with respect to the axis of the first gear 20. When the first gear 20 and the second gear 30 are rotated relatively or reversely, the distance between the first connection shaft 21 and the second connection shaft 31 may be changed. 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, so that the movable rod 40 can be always connected with the first connecting shaft 21 and the second connecting shaft 31.

Case 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 axis of the second gear 30, and the first connecting shaft 21 is disposed eccentrically with respect to the axis of the first gear 20. When the first gear 20 and the second gear 30 are rotated relatively or reversely, the distance between the first connection shaft 21 and the second connection shaft 31 may be changed. When the second gear 30 and the first gear 20 are rotated, the first end of the movable lever 40 can be rotated about the axis of the second connection shaft 31, and the first connection shaft 21 can be moved along the length direction of the movable lever 40.

Case 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 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 are rotated relatively or reversely, the distance between the first connection shaft 21 and the second connection shaft 31 may be changed. 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.

Case 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 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 are rotated relatively or reversely, the distance between the first connection shaft 21 and the second connection shaft 31 may be changed. When the first gear 20 and the second gear 30 are rotated, the first end of the movable lever 40 can be rotated about the axis of the first connecting shaft 21, and the second connecting shaft 31 can be moved along the length direction of the movable lever 40.

Further, in order to realize a hovering function and a damping feeling when a user operates the foldable screen, a plurality of positioning grooves 41 are provided on the movable lever 40 to be spaced apart 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 connection shaft 21, the positioning slider 50 is connected to the second connection shaft 31, and when the second connection 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 simultaneously. When the first end of the movable rod 40 is connected to the second connection shaft 31, the positioning slider 50 is connected to the first connection shaft 21, and when the first connection shaft 21 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 simultaneously.

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 clamped with the first positioning slot, and cannot move to the position where the second positioning slot is located, so that a 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 sense is realized.

Thus, according to the hinge assembly 100 of the foldable screen of the embodiment of the present application, by providing the first connection shaft 21 at the first side of the first gear 20, providing the second connection shaft 31 at the first side of the second gear 30, and providing 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 are rotated, the distance between the first connection shaft 21 and the second connection shaft 31 is changed, and the movable lever 40 can be always connected to both the first connection shaft 21 and the second connection shaft 31 at the same time. The movable lever 40 is provided with a plurality of positioning grooves 41, and the positioning slider 50 cooperates with the positioning grooves 41 to realize a hovering function and a damping feeling.

According to one embodiment of the present application, as shown in fig. 2 and 3, the support member 10 is connected 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 is advantageous for installing the movable bar 40, and can simplify 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 respectively inserted into the corresponding holes.

Alternatively, as shown in fig. 4, 5 and 8, the movable rod 40 is provided with a channel 42 extending along its length direction, and the two sides of the channel 42 in the length direction are respectively provided with positioning grooves 41 corresponding to each other, 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 the left-right direction, and the width direction of the movable lever 40 is defined as the 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 front and rear sides of the channel 42. When the positioning slider 50 moves in the left-right direction, the front and rear sides of the positioning slider 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 groove, two adjacent positioning grooves 41 are smoothly transited, and a plurality of positioning grooves 41 form a wave structure, and the positioning grooves 41 can be damping grooves and serve as gears. This structure is favorable to making the slider 50 move from current constant head tank 41 to next constant head tank 41, avoids slider 50 card in a certain constant head tank 41, reduces user's use experience.

In some embodiments of the present application, the positioning slider 50 is rotatable relative to the first connection shaft 21 when the positioning slider 50 is mounted on the first connection shaft 21. When the positioning slider 50 is mounted on the second connection shaft 31, the positioning slider 50 is rotatable with respect to the second connection shaft 31. By employing a rotatable form, rectangular positioning slide 50 is facilitated to move along channel 42.

According to one 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 plungers 53. Specifically, the first body 51 is provided with a first rotation shaft hole 57, and the second connection shaft 31 is inserted into the first rotation shaft 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 provided between the second body 51 and the first body, two inserting rods 53 are respectively provided at two ends of the receiving cavity 55, a first end of each inserting rod 53 is inserted into the receiving cavity 55, and a second end of each inserting rod 53 is matched with the positioning groove 41. That is, the second end of the plunger 53 is movable from within the first detent to within the second detent as the detent slide 50 slides along the channel 42.

It should be noted that, the relative relationship between the plunger 53 and the first body 51 and the second body 52 includes, but is not limited to, the above-described structure. For example, the first body 51 and the second body 52 are integrally formed. The number of the inserting rods 53 may be one or two, and when the number of the inserting rods 53 is one, one end of the inserting rod 53 may be connected with the first body 51, and the other end of the inserting rod 53 may be inserted into the corresponding positioning groove 41. When the number of the inserting rods 53 is two, the two inserting rods 53 can be inserted into the corresponding positioning grooves 41 respectively, and the balance and consistency of the damping force applied when the user folds the screen can be increased.

Alternatively, as shown in fig. 6 and 7, the positioning slider 50 further includes an elastic member 54, where the elastic member 54 is disposed in the accommodating cavity 55 and between the two inserting rods 53, and two ends of the elastic member 54 are connected to first ends of the two inserting rods 53, respectively. When the inserting rod 53 moves from the first positioning groove to the second positioning groove, the inserting rod 53 presses the elastic piece 54, the elastic piece 54 deforms and contracts, and when the inserting rod 53 moves to the position where the second positioning groove is located, the elastic piece 54 stretches, and the inserting rod 53 is inserted into the second positioning groove. During the movement of the plunger 53, friction and the urging force of the elastic member 54 are received. By providing the elastic member 54, not only the positioning effect when the plunger 53 is positioned in the positioning groove 41 can be improved, the hovering function can be optimized, but also the damping force received by the plunger 53 when moving between the first positioning groove and the second positioning groove can be increased.

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 insert rod 53 to separate from the accommodating cavity 55, so as to limit the movement range of the insert rod 53, and avoid the insert rod 53 from being separated from the positioning slide block 50 in the movement process.

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

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

According to the hinge assembly 100 of the foldable screen of the present embodiment, the first connecting shaft 21 is provided at the first side of the first gear 20, the second connecting shaft 31 is provided at the first side of the second gear 30, and the movable lever 40 is provided at 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 lever 40 and the positioning slider 50 to rotate. During the rotation of the first and second connecting

shafts

21 and 31, the distance changes, and the linear movement of the positioning slider 50 in the channel 42 is achieved. By arranging the positioning groove 41 in the channel 42, when the positioning slide block 50 moves linearly in the channel 42, the positioning slide block 50 is compressed by the elastic piece 54 and is stressed by the friction force when moving from the first positioning groove to the second positioning groove, so that a hovering function is realized; when the 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 the advantages of simple structure, easy processing, small occupied space, etc.

The embodiment of the application also provides electronic equipment, which comprises the hinge assembly 100 of the foldable screen of any embodiment, wherein the hinge assembly 100 of the foldable screen can be connected with the foldable screen of the electronic equipment through a hinge, so that the telescopic folding of the foldable screen is controlled.

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 the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles 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;

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.