1. A folding hinge has a mounting base; the method is characterized in that: the left side and the right side of the mounting base are symmetrically provided with overturning components; the mounting base is provided with a synchronous transmission gear set for synchronous rotation of the turnover assemblies on two sides; the overturning assembly comprises a driving plate, a first overturning plate, a second overturning plate and a damping piece for damping rotation of the overturning assembly during overturning; the lower end of the first turnover plate is rotatably connected with the mounting base, and the upper end of the first turnover plate is rotatably connected with the driving plate; the upper end of the second turnover plate is a compensation part, and the lower end of the second turnover plate is a driving part; the compensation part of the second turnover plate is in sliding compensation fit with the driving plate; a guide chute which is guided outwards from top to bottom is arranged on the plane of the second turnover plate opposite to the first turnover plate; the compensation part of the second turnover plate is provided with a limiting body which is used for being inserted into the guide chute and is in sliding fit with the guide chute; when the folding hinge is in a fully opened state to a closed state, the driving plate has the action of gradually keeping away from the mounting base under the sliding compensation action of the second turnover plate and the guiding action of the limiting body under the guiding action of the guiding sliding chute; the driving parts of the second turnover plates on the left side and the right side of the mounting base are in transmission fit with the synchronous transmission gear set, so that the turnover plate assemblies on the two sides form synchronous turnover through the synchronous transmission gear set; when the driving plate is in a closed state of the folding hinge, the upper ends of the first turnover plates are close to each other, and the lower ends of the first turnover plates are far away from each other; and an outward-expanding cavity is formed between the second turnover plates.

2. The folding hinge according to claim 1, characterized in that: when the folding hinge is in a fully opened state to a closed state, the driving plate has the actions of gradually leaving away from the mounting base and then gradually approaching to the mounting base under the sliding compensation action of the second turnover plate and the guiding action of the limiting body on the guiding sliding groove.

3. The folding hinge according to claim 2, characterized in that: the guide chute consists of a first chute part and a second chute part which are communicated with each other from top to bottom; when the limiting body moves from the upper end to the lower end of the first sliding groove, the driving plate gradually gets away from the mounting base; when the limiting body is positioned at the intersection of the first sliding groove and the second sliding groove, the distance between the driving plate and the mounting base is farthest; when the limiting body moves to the lower end from the upper end of the second sliding groove, the driving plate gradually approaches to the mounting base.

4. The folding hinge according to claim 3, characterized in that: the first sliding groove and the second sliding groove are arc-shaped grooves; the guide sliding groove formed by the first sliding groove and the second sliding groove is wavy.

5. The folding hinge according to claim 1, characterized in that: the synchronous transmission gear set is an even-numbered gear set, and the driving parts of the second turnover plates on the left side and the right side of the mounting base are in transmission connection with the gears on the two sides of the even-numbered gear set respectively.

6. The folding hinge according to claim 1, characterized in that: the synchronous transmission gear set comprises a first bevel gear, a middle bevel gear and a second bevel gear; the rotation axes of the first bevel gear and the second bevel gear are parallel, and the rotation axis of the middle bevel gear is vertical to the rotation axis of the first bevel gear; the first helical gear and the second helical gear are positioned on two sides of the middle helical gear, and the first helical gear and the second helical gear are in transmission fit with the middle helical gear; the first bevel gear and the second bevel gear form synchronous opposite rotation through the middle bevel gear;

the first bevel gear and the second bevel gear are in transmission connection with driving parts of the second turnover plates on the left side and the right side of the mounting base respectively.

7. The folding hinge according to claim 1, characterized in that: the lower end of the first turnover plate is rotatably connected with the mounting base through a compensation sliding block; the mounting base and the outer side of the compensation sliding block form virtual shaft type rotation fit; the lower end of the first turnover plate and the inner side of the compensation slide block form virtual shaft type rotation fit.

8. The folding hinge according to claim 7, characterized in that: the compensation sliding block is provided with a first limiting sliding groove; a first limiting block is arranged at one end of the first turnover plate, which is in running fit with the compensation slide block; the first limiting block is arranged in the first limiting sliding groove in a sliding manner along with the relative rotation of the first turnover plate and the compensation sliding block; when the drive plate is in a closed state, the first limiting block is located at one end of the first limiting sliding groove and forms limiting fit with the first limiting sliding groove to limit the first turnover plate to continue to turn over towards the closing direction of the drive plate.

9. The folding hinge according to claim 1, characterized in that: an arc-shaped compensation chute is arranged on the driving plate; a compensation part of the second turnover plate is rotatably provided with a pin shaft; the second turnover plate and the driving plate are inserted into the arc compensation chute through one end of the pin shaft to form sliding compensation matching; the other end of the pin shaft is a limiting body which is inserted into the guide chute and is in sliding fit with the guide chute.

10. The folding hinge according to claim 9, characterized in that: one end of the pin shaft inserted into the arc compensation chute is rotatably provided with an arc limiting block; the arc-shaped limiting block is arranged in the arc-shaped compensation sliding groove in a sliding manner; the outer arc surface of the arc limiting block is in contact fit with the outer arc surface of the arc compensation sliding groove, and the inner arc surface of the arc limiting block is in contact fit with the inner arc surface of the arc compensation sliding groove.

11. The folding hinge according to claim 1, characterized in that: the mounting base comprises a connecting bottom plate and a cover plate; the cover plate is positioned above the connecting bottom plate, and a channel which is communicated with the outside and used for a connecting bolt to enter is formed between the cover plate and the connecting bottom plate; a connecting hole matched with a connecting bolt entering from the channel is formed in the channel on the connecting bottom plate; a through hole is arranged right above the connecting hole on the cover plate.

12. The folding hinge according to claim 1, characterized in that: the damping part comprises a first damping convex tooth which is arranged on the driving part of the second turnover plate and rotates coaxially with the driving part, and a second damping convex tooth which seeks to be meshed with the first damping convex tooth under the action of a damping spring; along with the rotation of the turnover assembly, the first damping convex teeth and the second damping convex teeth on the corresponding sides form damping rotation through distance difference formed in the continuous meshing process.

13. The folding hinge according to claim 12, characterized in that: an output shaft of a gear in the synchronous transmission gear set, which is in transmission fit with the driving part of the second turnover plate, sequentially penetrates through the driving part, the second damping convex teeth and the damping spring; the damping spring acts on the mounting base and the second damping convex teeth respectively; an output shaft of the gear in transmission fit with the driving part of the second turnover plate and the driving part of the second turnover plate form circumferential transmission fit; the output shaft of the gear in transmission fit with the driving part of the second turnover plate can rotate in the second damping convex teeth and the damping springs without driving the second damping convex teeth and the damping springs to rotate.

14. The folding hinge according to claim 13, characterized in that: the mounting base comprises a reference body, a retainer and a limiting frame; the reference body is rotationally connected with the first turnover plate; the retainer and the reference body are fixedly arranged; the synchronous transmission gear set is rotationally arranged on the retainer, and the limiting frame is fixedly arranged on the retainer; an output shaft of a gear in transmission fit with the driving part of the second turnover plate sequentially penetrates through the driving part, the second damping convex teeth and the damping spring and then is rotationally connected with the limiting frame; two ends of the damping spring respectively act on the limiting frame and the second damping convex teeth; the second damping convex teeth positioned on the left side and the right side of the mounting base are connected into a whole through a connecting rod.

15. Folding hinge mechanism, its characterized in that: comprising a hinge mount, a plurality of folding hinges as claimed in claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14, a support plate for supporting the folds of the folding screen; the plurality of folding hinges are fixedly arranged on the hinge mounting seat along the extending direction of the hinge mounting seat; the supporting plates are arranged between the first turnover plates on the same sides of the adjacent folding hinges, and the two ends of each supporting plate are fixedly connected with the corresponding first turnover plates respectively.

16. A mobile terminal, characterized by: comprising the folding hinge mechanism of claim 15; the flexible screen, the left shell and the right shell are also included; the inner sides of the left casing and the right casing are respectively provided with a left supporting plate and a right supporting plate which support the rotation of the flexible screen, and the left supporting plate and the right supporting plate are fixedly connected with the flexible screen; the left shell is fixedly connected with a driving plate of the turnover assembly on the left side of each folding hinge; the right side shell is fixedly connected with a driving plate of the turnover assembly on the right side of each folding hinge; when the folding hinge is fully opened, the left and right housings enclose the hinge mount.

Background

With the continuous progress and expansion of the science and technology in the field of mobile terminals and the coming of the 5G network era, people have greater and greater dependence on the mobile terminals. Nowadays, with the continuous update of various software such as chatting and video, people feel that a conventional touch screen mobile phone or tablet computer is not enough, and the main reason is that the size of a screen is limited by the volume of a mobile terminal.

In order to solve the problem, people invent a flexible screen, apply the flexible screen to the mobile terminal, and through a folding design, the mobile terminal can meet the requirements of people in carrying and can expand the screen of the mobile terminal through unfolding when in use. To achieve this above requirement, it is critical whether the design of the hinge mechanism is reasonable.

The folding hinge mechanism of the mobile terminal adopting the folding screen at present can be complex in mechanical structure, and different mechanical components are often required to be designed to meet the requirements in order to realize synchronous overturning, damping hand feeling and the like in a limited space. Meanwhile, when the hinge mounting seat of the folding hinge mechanism mounted on the mobile terminal of the existing folding screen is in a fully opened state, the hinge mounting seat cannot be shielded, and the appearance is influenced.

Disclosure of Invention

The first purpose of the invention is to provide a folding hinge which can form an enlarged cavity when being folded and furled and can realize interference avoidance in the folding process.

The technical scheme for realizing the first purpose of the invention is as follows: the folding hinge is provided with a mounting base; the left side and the right side of the mounting base are symmetrically provided with overturning components; the mounting base is provided with a synchronous transmission gear set for synchronous rotation of the turnover assemblies on two sides; the overturning assembly comprises a driving plate, a first overturning plate, a second overturning plate and a damping piece for damping rotation of the overturning assembly during overturning; the lower end of the first turnover plate is rotatably connected with the mounting base, and the upper end of the first turnover plate is rotatably connected with the driving plate; the upper end of the second turnover plate is a compensation part, and the lower end of the second turnover plate is a driving part; the compensation part of the second turnover plate is in sliding compensation fit with the driving plate; a guide chute which is guided outwards from top to bottom is arranged on the plane of the second turnover plate opposite to the first turnover plate; the compensation part of the second turnover plate is provided with a limiting body which is used for being inserted into the guide chute and is in sliding fit with the guide chute; when the folding hinge is in a fully opened state to a closed state, the driving plate has the action of gradually keeping away from the mounting base under the sliding compensation action of the second turnover plate and the guiding action of the limiting body under the guiding action of the guiding sliding chute; the driving parts of the second turnover plates on the left side and the right side of the mounting base are in transmission fit with the synchronous transmission gear set, so that the turnover plate assemblies on the two sides form synchronous turnover through the synchronous transmission gear set; when the driving plate is in a closed state of the folding hinge, the upper ends of the first turnover plates are close to each other, and the lower ends of the first turnover plates are far away from each other; and an outward-expanding cavity is formed between the second turnover plates.

When the folding hinge is in a fully opened state to a closed state, the driving plate has the actions of gradually leaving away from the mounting base and then gradually approaching to the mounting base under the sliding compensation action of the second turnover plate and the guiding action of the limiting body on the guiding sliding groove.

The guide chute consists of a first chute part and a second chute part which are communicated with each other from top to bottom; when the limiting body moves from the upper end to the lower end of the first sliding groove, the driving plate gradually gets away from the mounting base; when the limiting body is positioned at the intersection of the first sliding groove and the second sliding groove, the distance between the driving plate and the mounting base is farthest; when the limiting body moves to the lower end from the upper end of the second sliding groove, the driving plate gradually approaches to the mounting base.

Further, the first sliding groove and the second sliding groove are both arc-shaped grooves; the guide sliding groove formed by the first sliding groove and the second sliding groove is wavy.

The synchronous transmission gear set is an even-numbered gear set, and the driving parts of the second turnover plates on the left side and the right side of the mounting base are in transmission connection with the gears on the two sides of the even-numbered gear set respectively.

As a modified design, the synchronous transmission gear set comprises a first bevel gear, a middle bevel gear and a second bevel gear; the rotation axes of the first bevel gear and the second bevel gear are parallel, and the rotation axis of the middle bevel gear is vertical to the rotation axis of the first bevel gear; the first helical gear and the second helical gear are positioned on two sides of the middle helical gear, and the first helical gear and the second helical gear are in transmission fit with the middle helical gear; the first bevel gear and the second bevel gear form synchronous opposite rotation through the middle bevel gear;

the first bevel gear and the second bevel gear are in transmission connection with driving parts of the second turnover plates on the left side and the right side of the mounting base respectively.

The lower end of the first turnover plate is rotatably connected with the mounting base through a compensation sliding block; the mounting base and the outer side of the compensation sliding block form virtual shaft type rotation fit; the lower end of the first turnover plate and the inner side of the compensation slide block form virtual shaft type rotation fit.

The compensation slide block is provided with a first limiting chute; a first limiting block is arranged at one end of the first turnover plate, which is in running fit with the compensation slide block; the first limiting block is arranged in the first limiting sliding groove in a sliding manner along with the relative rotation of the first turnover plate and the compensation sliding block; when the drive plate is in a closed state, the first limiting block is located at one end of the first limiting sliding groove and forms limiting fit with the first limiting sliding groove to limit the first turnover plate to continue to turn over towards the closing direction of the drive plate.

The drive plate is provided with an arc-shaped compensation chute; a compensation part of the second turnover plate is rotatably provided with a pin shaft; the second turnover plate and the driving plate are inserted into the arc compensation chute through one end of the pin shaft to form sliding compensation matching; the other end of the pin shaft is a limiting body which is inserted into the guide chute and is in sliding fit with the guide chute.

One end of the pin shaft inserted into the arc compensation chute is rotatably provided with an arc limiting block; the arc-shaped limiting block is arranged in the arc-shaped compensation sliding groove in a sliding manner; the outer arc surface of the arc limiting block is in contact fit with the outer arc surface of the arc compensation sliding groove, and the inner arc surface of the arc limiting block is in contact fit with the inner arc surface of the arc compensation sliding groove.

The mounting base comprises a connecting bottom plate and a covering plate; the cover plate is positioned above the connecting bottom plate, and a channel which is communicated with the outside and used for a connecting bolt to enter is formed between the cover plate and the connecting bottom plate; a connecting hole matched with a connecting bolt entering from the channel is formed in the channel on the connecting bottom plate; a through hole is arranged right above the connecting hole on the cover plate.

The damping part comprises a first damping convex tooth which is arranged on the driving part of the second turnover plate and rotates coaxially with the driving part, and a second damping convex tooth which seeks to be meshed with the first damping convex tooth under the action of a damping spring; along with the rotation of the turnover assembly, the first damping convex teeth and the second damping convex teeth on the corresponding sides form damping rotation through distance difference formed in the continuous meshing process.

An output shaft of a gear in the synchronous transmission gear set, which is in transmission fit with the driving part of the second turnover plate, sequentially penetrates through the driving part, the second damping convex teeth and the damping spring; the damping spring acts on the mounting base and the second damping convex teeth respectively; an output shaft of the gear in transmission fit with the driving part of the second turnover plate and the driving part of the second turnover plate form circumferential transmission fit; the output shaft of the gear in transmission fit with the driving part of the second turnover plate can rotate in the second damping convex teeth and the damping springs without driving the second damping convex teeth and the damping springs to rotate.

The mounting base comprises a reference body, a retainer and a limiting frame; the reference body is rotationally connected with the first turnover plate; the retainer and the reference body are fixedly arranged; the synchronous transmission gear set is rotationally arranged on the retainer, and the limiting frame is fixedly arranged on the retainer; an output shaft of a gear in transmission fit with the driving part of the second turnover plate sequentially penetrates through the driving part, the second damping convex teeth and the damping spring and then is rotationally connected with the limiting frame; two ends of the damping spring respectively act on the limiting frame and the second damping convex teeth; the second damping convex teeth positioned on the left side and the right side of the mounting base are connected into a whole through a connecting rod.

A second object of the present invention is to provide a folding hinge mechanism which can provide a larger accommodation space for a folding portion of a folding screen, reduce or prevent the folding portion of the folding screen from being squeezed and collided, and at the same time, can realize an interference-preventing avoiding action during the folding process.

The technical scheme for realizing the second purpose of the invention is as follows: the folding hinge mechanism comprises a hinge mounting seat, a plurality of folding hinges and a supporting plate for supporting the folding part of the folding screen; the plurality of folding hinges are fixedly arranged on the hinge mounting seat along the extending direction of the hinge mounting seat; the supporting plates are arranged between the first turnover plates on the same sides of the adjacent folding hinges, and the two ends of each supporting plate are fixedly connected with the corresponding first turnover plates respectively.

The third purpose of the present invention is to provide a mobile terminal using the above folding hinge mechanism, which can effectively reduce or even avoid the extrusion and collision of the folding portion of the flexible screen, and can cover the hinge mount when fully opened, so that the appearance of the product is more beautiful; meanwhile, when the foldable door is folded and closed, the left side machine shell and the right side machine shell are avoided from interfering and colliding with the hinge mounting seat through interference prevention.

The technical scheme for realizing the third purpose of the invention is as follows: the mobile terminal comprises the folding hinge mechanism; the flexible screen, the left shell and the right shell are also included; the inner sides of the left casing and the right casing are respectively provided with a left supporting plate and a right supporting plate which support the rotation of the flexible screen, and the left supporting plate and the right supporting plate are fixedly connected with the flexible screen; the left shell is fixedly connected with a driving plate of the turnover assembly on the left side of each folding hinge; the right side shell is fixedly connected with a driving plate of the turnover assembly on the right side of each folding hinge; when the folding hinge is fully opened, the left and right housings enclose the hinge mount.

The invention has the positive effects that: (1) according to the folding hinge, a larger accommodating cavity can be provided for the folding part of the subsequent folding screen when the folding hinge is folded and folded through a plurality of compensating sliding positions, so that the folding part of the folding screen is prevented from being damaged; meanwhile, the drive board can be prevented from interfering and avoiding actions through the guide sliding groove, so that the hinge mounting seat can be shielded when the mobile terminal using the folding hinge is completely opened, the overall attractiveness is improved, and meanwhile, the problem of overturning interference is effectively avoided.

(2) According to the invention, the drive plate has the actions of gradually keeping away from the mounting base and then gradually approaching to the mounting base under the sliding compensation action of the second turnover plate and the guiding action of the limiting body under the guiding action of the guiding sliding groove, the design can make the avoiding action when the drive plate is turned over to be avoided, and the drive plate and the mounting base can keep the minimum gap at other times, so that the gap between the left side casing and the hinge mounting base and the gap between the right side casing and the hinge mounting base can be minimum when the mobile terminal using the folding hinge is in a closed state and a completely opened state at the later stage, and the use feeling is improved.

(3) The wave-shaped guide sliding groove is adopted, so that the avoiding action is smoother and more consistent.

(4) The synchronous transmission gear set adopts the matching mode of the first helical gear, the middle helical gear and the second helical gear, so that the synchronous rotation can be ensured while the number of the gears is reduced.

(5) According to the foldable screen, the lower end of the first turnover plate is rotatably connected with the mounting base through the compensation sliding block, so that the outward expansion angle of the lower end of the first turnover plate can be increased, and a larger accommodating space is provided for the folding part of the foldable screen.

(6) According to the invention, the first limiting chute is in limiting fit with the first limiting block, so that the driving plate can be ensured to be vertical, and the phenomenon that the driving plate is closed to rotate excessively is avoided.

(7) The design of the pin shaft on the compensation part can simultaneously solve the problem of the matching of the pin shaft and the arc compensation chute on the driving plate and the problem of the sliding matching of the pin shaft and the guide chute, and the invention has simple and effective structure and ingenious design.

(8) According to the folding hinge, the arc-shaped limiting block is matched with the arc-shaped compensation sliding groove, so that the contact area can be increased, and the stability of the folding hinge is improved.

(9) The channel design on the mounting base can hide the fixed connection position for the mounting base, and a good anti-dismounting function is achieved.

(10) The damping piece can lock the overturning assembly in the overturning process, so that the overturning hand feeling is improved.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which

FIG. 1 is a schematic view of the folding hinge of the present invention in a fully open position;

FIG. 2 is a schematic view of the folding hinge of the present invention at ninety degrees of rotation;

FIG. 3 is a schematic view of the folding hinge of the present invention in a fully closed position;

FIG. 4 is a schematic structural view of a first flipping panel according to the present invention;

FIG. 5 is a schematic structural view of a second flipping panel according to the present invention;

FIG. 6 is a schematic view showing the structure of a driving plate according to the present invention;

FIG. 7 is a schematic structural diagram of a compensating slide block according to the present invention;

FIG. 8 is a schematic view of the structure of the mounting base of the present invention;

FIG. 9 is a schematic view of the folding hinge mechanism of the present invention in a fully open position;

FIG. 10 is a schematic view of the folding hinge mechanism of the present invention at ninety degrees flip;

FIG. 11 is a schematic view of the folding hinge mechanism of the present invention in a fully closed position;

fig. 12 is a schematic structural view of the mobile terminal in a fully opened state according to the present invention;

FIG. 13 is a block diagram of the mobile terminal of the present invention shown flipped ninety degrees;

fig. 14 is a schematic structural diagram of the mobile terminal in a fully closed state according to the present invention;

Detailed Description

Referring to fig. 1 to 8, the folding hinge of the present invention has a mounting base 1; the left side and the right side of the mounting base 1 are symmetrically provided with turnover assemblies 2; the mounting base 1 is provided with a synchronous transmission gear set 3 for synchronously rotating the turnover assemblies 2 on two sides; the overturning assembly 2 comprises a driving plate 21, a first overturning plate 22, a second overturning plate 23 and a damping piece 24 for damping rotation of the overturning assembly 2 during overturning; the lower end of the first turnover plate 22 is rotatably connected with the mounting base 1 through a compensation slide block 25; the mounting base 1 and the outer side of the compensation slide block 25 form virtual shaft type rotation fit; the lower end of the first flipping board 22 forms a virtual axis type rotation fit with the inner side of the compensation slide 25.

The virtual shaft type rotation fit is the rotation fit of the arc-shaped sliding groove and the arc-shaped sliding block.

The compensation slide block 25 is provided with a first limit chute 251; a first limit block 221 is arranged at one end of the first turnover plate 22, which is in running fit with the compensation slide block 25; the first limiting block 221 is slidably arranged in the first limiting chute 251 along with the relative rotation of the first turnover plate 22 and the compensation slide block 25; when the driving plate 21 is in the closed state, the first limiting block 221 is located at one end of the first limiting sliding groove 251, and forms a limiting fit with the first limiting sliding groove 251 to limit the first flipping plate 22 to continue flipping toward the closing direction of the driving plate 21.

The upper end of the first turnover plate 22 is rotatably connected with the middle part of the driving plate 21 through a rotating shaft; the upper end of the second flipping panel 23 is a compensation portion, and the lower end of the second flipping panel 23 is a driving portion 231.

An arc-shaped compensation chute 211 is arranged on the driving plate 21; the compensation part of the second turnover plate 23 is rotatably provided with a pin shaft 232; one end of the pin shaft 232 is rotatably provided with an arc-shaped limiting block 233 which can form relative sliding in the arc-shaped compensation chute 211; the second turnover plate 23 and the driving plate 21 are inserted into the arc compensation sliding groove 211 through the arc limiting block 233 to form sliding compensation matching; the extrados of the arc-shaped limiting block 233 is in contact fit with the extrados of the arc-shaped compensation sliding groove 211, and the intrados of the arc-shaped limiting block 233 is in contact fit with the intrados of the arc-shaped compensation sliding groove 211.

A guide chute 222 which is guided outwards from top to bottom is arranged on the plane of the second turnover plate 23 opposite to the first turnover plate 22; a limiting body which is used for being inserted into the guide sliding groove 222 and is in sliding fit with the guide sliding groove is arranged on the compensation part of the second turnover plate 23; the other end of the pin 232 is a stopper inserted into and slidably engaged with the guide chute 222.

When the folding hinge is in a fully opened state to a closed state, the driving plate 21 performs actions of gradually moving away from the mounting base and then gradually moving closer to the mounting base under the sliding compensation action of the second turnover plate 23 and the guiding action of the limiting body under the guiding action of the guiding sliding chute 222.

To accomplish the above, the guiding chute 222 is composed of a first chute part 222-1 and a second chute part 222-2 which are communicated with each other from top to bottom; when the limiting body moves from the upper end to the lower end of the first sliding groove 222-1, the driving plate 21 gradually gets away from the mounting base 1; when the limiting body is positioned at the intersection of the first sliding groove 222-1 and the second sliding groove 222-2, the distance between the driving plate 21 and the mounting base 1 is farthest; when the stopper moves from the upper end to the lower end of the second chute 222-2, the driving plate 21 gradually approaches the mounting base 1. The first sliding groove 222-1 and the second sliding groove 222-2 are both arc-shaped grooves; the guide sliding groove 222 formed by the first sliding groove 222-1 and the second sliding groove 222-2 is wavy. Of course, other shapes of the first and second runners 222-1, 222-2 are within the scope of the present application as long as they accomplish the above-mentioned actions.

The driving parts 231 of the second turnover plates 23 on the left side and the right side of the mounting base 1 are in transmission fit with the synchronous transmission gear set 3, so that the turnover plate assemblies 2 on the two sides form synchronous turnover through the synchronous transmission gear set 3; when the driving plate 21 is in the closed state of the folding hinge, the upper ends of the first turnover plates 22 are close to each other, and the lower ends of the first turnover plates 22 are far away from each other; and the second flipping panels 23 form an outwardly expanding cavity therebetween.

The synchronous transmission gear set 3 comprises a first bevel gear 31, an intermediate bevel gear 32 and a second bevel gear 33; the rotation axes of the first bevel gear 31 and the second bevel gear 33 are parallel, and the rotation axis of the intermediate bevel gear 32 is perpendicular to the rotation axis of the first bevel gear 31; the first bevel gear 31 and the second bevel gear 32 are positioned at two sides of the middle bevel gear 32, and the first bevel gear 31 and the second bevel gear 33 are in transmission fit with the middle bevel gear 32; the first helical gear 31 and the second helical gear 33 are rotated in opposite directions in synchronization by the intermediate helical gear 32. Of course, even-numbered gear sets may be used for the synchromesh gear set 3.

The first bevel gear 31 and the second bevel gear 33 are respectively connected to the driving portions 231 of the second flipping plates 23 on the left and right sides of the mounting base 1 in a transmission manner.

The mounting base 1 comprises a connecting bottom plate 11 and a cover plate 12; the cover plate 12 is positioned above the connecting bottom plate 11, and a channel 13 which is communicated with the outside and is used for a connecting bolt to enter is formed between the cover plate 12 and the connecting bottom plate 11; a connecting hole 111 matched with a connecting bolt entering from the channel 13 is arranged in the channel 13 on the connecting bottom plate 11; a through hole 121 is formed in the cover plate 12 directly above the connection hole 111. After the coupling bolt is put into the coupling hole 111 from the passage 13, the coupling bolt can be tightened by inserting a tool from the through hole 121.

The damping member 24 includes a first damping tooth 241 provided on the driving part 231 of the second flipping plate 23 and rotating coaxially with the driving part 231, and a second damping tooth 243 seeking to mesh with the first damping tooth 241 under the action of the damping spring 242; as the flip assembly 2 rotates, the first and second damping teeth 241 and 243 on the corresponding sides form a damping rotation by a distance difference formed during continuous meshing.

An output shaft of a gear in the synchronous transmission gear set 3, which is in transmission fit with the driving part 231 of the second turnover plate 23, sequentially penetrates through the driving part 231, the second damping convex tooth 243 and the damping spring 242; the damping spring 242 acts on the mounting base 1 and the second damping convex tooth 243 respectively; the output shaft of the gear in transmission fit with the driving part 231 of the second flipping plate 23 forms circumferential transmission fit with the driving part 231 of the second flipping plate 23; the output shaft of the gear in driving engagement with the driving part 231 of the second flipping plate 23 is rotatable within the second damping lobe 243 and the damping spring 242 without rotating the second damping lobe 243 and the damping spring 242.

The mounting base 1 comprises a reference body 14, a holding frame 15 and a limiting frame 16; the reference body 14 is rotatably connected with a first turnover plate 22; the holder 15 and the reference body 14 are fixedly installed; the synchronous transmission gear set 3 is rotationally arranged on the retainer 15, and the limiting frame 16 is fixedly arranged on the retainer 15; an output shaft of a gear in transmission fit with the driving part 231 of the second turnover plate 23 sequentially penetrates through the driving part 231, the second damping convex tooth 243 and the damping spring 242 and then is rotationally connected with the limiting frame 16; the two ends of the damping spring 242 respectively act on the limiting frame 16 and the second damping convex tooth 243; the second damping teeth 243 on the left and right sides of the mounting base 1 are integrally connected by a link.

Referring to fig. 9 to 11, the folding hinge mechanism of the present invention includes a hinge mounting base 4, two folding hinges as described above, and a support plate 5 for supporting a folded portion of a folding screen; the two folding hinges are fixedly arranged on the hinge mounting seat 4 along the extending direction of the hinge mounting seat 4; supporting plates 5 are arranged between the first turnover plates 22 on the same side of the adjacent folding hinges, and two ends of each supporting plate 5 are fixedly connected with the corresponding first turnover plate 22.

Referring to fig. 12 to 14, the mobile terminal according to the present invention includes the above-described folding hinge mechanism; the flexible screen 6, the left shell 7 and the right shell 8 are also included; the inner sides of the left casing 7 and the right casing 8 are respectively provided with a left supporting plate and a right supporting plate which support the rotation of the flexible screen, and the left supporting plate and the right supporting plate are fixedly connected with the flexible screen; the left side machine shell 7 is fixedly connected with the upper end of a driving plate 21 of the turnover assembly 2 at the left side of each folding hinge; the right side machine shell 8 is fixedly connected with a driving plate 21 of the turnover assembly 2 on the right side of each folding hinge; when the folding hinge is fully opened, the left and right casings 7 and 8 enclose the hinge mount 4.

The action process of the mobile terminal in the invention is as follows:

from the closed state to the fully open state: the left casing 7 and/or the right casing 8 are/is turned downwards manually, so that the driving plate 21 is driven to turn downwards, and the first turning plate 22 and the second turning plate 23 are driven to rotate downwards by turning the driving plate 21 downwards; meanwhile, the overturning components 2 on the left side and the right side rotate in opposite directions synchronously under the action of the synchronous transmission gear set 3; in the rotating process, the second turnover plate 23 realizes damping rotation under the action of the damping piece 24, namely realizing midway stop; meanwhile, when the limiting body slides from bottom to top in the second sliding groove 222-2, the left machine shell 7 and the right machine shell 8 are driven to move towards the direction far away from the hinge mounting seat 4; when the limiting body enters the first sliding groove 222-1 and slides from bottom to top, the left casing 7 and the right casing 8 are urged to move towards the hinge mounting seat 4. When fully opened, the left casing 7 and the right casing 8 completely cover the hinge mount 4 and form a splice at the back of the mobile terminal.

The reverse is true for the movement from the fully open state to the closed state.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.