CN111043149A

CN111043149A - Folding hinge and folding display device

Info

Publication number: CN111043149A
Application number: CN201911324003.XA
Authority: CN
Inventors: 陆苏; 刘明生; 刘建军; 韦光东
Original assignee: Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-04-21
Anticipated expiration: 2039-12-20
Also published as: CN111043149B

Abstract

A folding hinge comprises an inner folding hinge and an outer folding hinge, wherein the outer folding hinge comprises a main shaft, a first outer folding strip and a second outer folding strip which are positioned at the two transverse sides of the main shaft, a first outer folding plate and a second outer folding plate which are positioned outside the first outer folding strip and the second outer folding strip, and a hinge assembly which is used for hinging the main shaft, the first outer folding strip and the second outer folding strip with the first outer folding plate and the second outer folding plate, the external folding hinge comprises a connecting shaft, a first internal folded plate and a second internal folded plate which are positioned at the two transverse sides of the connecting shaft and are rotationally connected with the connecting shaft, the four corners of the first and the second inner folding plates are provided with rotating shafts, the first and the second outer folding plates are provided with limiting mechanisms corresponding to the rotating shafts for the rotating shafts to rotate, a balance control mechanism is arranged between the inner folding hinge and the outer folding hinge, and the balance control mechanism is connected with the first inner folding plate and the second inner folding plate to rotate; the application also provides a folding display device.

Description

Folding hinge and folding display device

Technical Field

The present disclosure relates to the field of communications electronics, and more particularly, to a foldable hinge and a foldable display device.

Background

With the development of the folding screen technology, the folding screen mobile phone has become a hot spot technology. Although the folding screen can be bent, the 180-degree bending cannot be realized, and the bent part still needs to keep a certain R angle, otherwise the screen can be damaged. The existing folding mode is divided into inward folding and outward folding, namely the screen is positioned at the inner side or the outer side after being folded, and for example, Mate X issued by Huawei is outward folding. At present, the folding mechanisms for connecting two folding screens for folding are quite complex in structure, one small folding mechanism even reaches hundreds of components assembled together, and the small folding mechanism is controlled by the complex mechanism, so that the instability of the mechanism is increased, and the small folding mechanism is also one of the main reasons that the existing folding screen mobile phone cannot be put on the market in a large batch.

Disclosure of Invention

In view of this, it is desirable to provide a folding hinge and a folding display device, in which an inner folding hinge and an outer folding hinge are arranged to cooperate with each other to realize outward folding, so that the outer folding hinge has a larger folding arc to protect a flexible screen.

In order to solve the above technical problem, the present application provides a folding hinge, including an inner folding hinge and an outer folding hinge, the outer folding hinge includes a main shaft, a first and a second outer folding strips located at two lateral sides of the main shaft, a first and a second outer folding plates located at two lateral sides of the first and the second outer folding strips, and a hinge assembly connecting the main shaft, the first and the second outer folding strips and the first and the second outer folding plates together, the outer folding hinge includes a connecting shaft and a first and a second inner folding plates located at two lateral sides of the connecting shaft and rotatably connected with the connecting shaft, four corners of the first and the second inner folding plates are provided with a rotating shaft, the first and the second outer folding plates correspond to the rotating shaft and are provided with a limiting mechanism for the rotating shaft to rotate, the limiting mechanism is provided with a hole structure for the rotating shaft to move, the rotating shaft moves along a lateral direction of the hole structure, and a balance control mechanism is arranged between the inner folding hinge and the outer folding hinge, and the balance control mechanism is connected with the first inner folding plate and the second inner folding plate to rotate.

Preferably, the main shaft of the external folding hinge, the first and second external folding strips, and the first and second external folding plates have longitudinal ends protruding in the vertical direction to form a plurality of sectors and a sector accommodating portion for accommodating the sectors, the connecting shaft of the internal folding hinge and the longitudinal ends of the first and second internal folding plates are located inside the sectors, the first and second external folding strips, and the first and second external folding plates are folded or unfolded by the hinge assembly, when folded, the sectors are accommodated in the sector accommodating portion to form a closed longitudinal end, and when unfolded, the sectors are only partially accommodated in the sector accommodating portion to form a closed longitudinal end.

Preferably, the main shaft includes a first sector portion formed by protruding from the inner side of the two longitudinal ends along the direction perpendicular to the surface of the main shaft, a first convex portion formed by protruding from the middle of the outer side of the first sector portion, and a first sector-shaped receiving portion formed at the two lateral sides of the first convex portion and located at the longitudinal outer side of the first sector portion, the first and second outward folding strips include a second sector-shaped receiving portion formed at the inner side of the two longitudinal ends near the first sector portion, a second sector portion located at the outer side of the second sector-shaped receiving portion, a second convex portion formed at the outer end of the second sector-shaped receiving portion and a third sector-shaped receiving portion located at the outer side of the second sector portion, and the first and second outward folding plates are provided with a fourth sector-shaped receiving portion and a sector-shaped side wall formed at the outer side of the fourth sector-shaped receiving portion, when folded, the first sector-shaped part is folded into the second sector-shaped accommodating part, the second convex part is folded into the first sector-shaped accommodating part, the second sector-shaped part is folded into the fourth sector-shaped accommodating part, and the sector-shaped side wall is folded into the third sector-shaped accommodating part.

Preferably, the balance control mechanism includes a pair of first rotating shafts fixed on the main shaft, a pair of second rotating shafts located between the pair of first rotating shafts and connected through an internal gear, a connecting gear connecting the adjacent first rotating shaft and the second rotating shaft, and an external gear fixed on the first rotating shaft and engaged with the internal gear, the internal gear includes fixing holes respectively sleeved and fixed outside the pair of second rotating shafts and a tooth structure located on the lateral outer side of the internal gear, the external gear includes an arm, a fixing hole formed at a first end of the arm and fixed outside the first rotating shaft, another tooth structure located outside the first end of the arm and engaged with the tooth structure of the internal gear, and a connecting shaft hole located at a second end of the arm and connected with the shaft lever, the connecting gear includes a connecting shaft hole respectively sleeved and located outside the first rotating shaft and the second rotating shaft, and a tooth engaged between the pair of second rotating shafts The connecting gear is fixed with the first rotating shaft and can rotate relative to the second rotating shaft, and the positions of the pair of second rotating shafts are fixed; the second ends of the arms are pivotally connected to the first and second outer flaps.

Preferably, the first and second outer folding plates are provided with a damping mechanism connected to the second end of the arm, the damping mechanism includes a first and second damping seats fixed in relative positions in a longitudinal direction, a moving groove transversely opened on the first damping seat, a shaft rod movable transversely to the moving groove, and a slider facing the first damping seat and elastically sliding on the second damping seat, the shaft rod includes a spherical end portion protruding out of the moving groove toward the slider, the slider is formed with a protrusion protruding toward the spherical end portion, inclined surfaces are formed on both transverse sides of the protrusion, the spherical end portion can pass over the protrusion along the inclined surfaces during movement, so that the spherical end portion is switched between two states on both transverse sides of the protrusion, and the second end of the arm is rotatably connected to the shaft rod.

Preferably, the second damping seat includes a second riveting portion for fixing, a pair of sliding groove arms formed by extending from the second riveting portion toward the first damping seat, and a sliding space formed between the pair of sliding groove arms, a track groove is formed inside each sliding groove arm, the slider is sleeved into the track groove at two lateral sides and moves longitudinally in the sliding space, an elastic member is clamped between the slider and the second riveting portion, and the elastic member applies an elastic force to the slider.

Preferably, the slider further comprises a slider main body and an extending portion located outside the sliding space, and the protrusion is formed by protruding from the extending portion toward the spherical end; the first damping seat further comprises a first riveting part fixed through a screw and a pair of moving groove arms formed by transversely extending the first riveting part, the moving grooves are formed in the moving groove arms, and the shaft rod transversely moves in the moving grooves.

Preferably, when the pair of external gears rotate, the pair of first rotating shafts are driven to displace relative to the second rotating shafts until the projections of the pair of first rotating shafts and the pair of second rotating shafts in the vertical direction at least partially coincide.

Preferably, the pair of external gears are respectively and correspondingly located at two lateral sides of the internal gear, and the connecting gear is respectively provided with two pairs of mutually meshed connecting gears at two longitudinal ends of the internal gear and the external gear.

In order to solve the technical problem, the present application further provides a folding display device, including aforementioned folding hinge, be located first, second folded sheet of the horizontal both sides of first, second exterior folded plate, be located first, second casing and laminating in the horizontal both sides of first, second interior folded plate in flexible screen outside first, the second folded sheet, flexible screen not with outer folding hinge bonding is fixed.

The mode that this application folding hinge mutually supported through folding hinge in setting up realizes outer book with outer folding hinge, makes outer folding hinge possess great folding radian in order to protect flexible screen, and the balanced folding of folding in-process both sides is controlled to installation balanced control mechanism between interior folding hinge and the outer folding hinge, interior folding hinge plays the support the effect of outer folding hinge.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1 is a perspective view of a communication device of the present application;

fig. 2 is a perspective view of another angle of the communication device of the present application;

FIG. 3 is an exploded perspective view of the foldable display device of the present application;

FIG. 4 is a perspective view of an inner folding hinge of the foldable display device of the present application and a partially enlarged view thereof;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a perspective view of an outer folding hinge, a balance control mechanism and a damping mechanism of the folding display device of the present application and a partially enlarged view thereof;

FIG. 7 is a perspective view of an outer folding hinge of the folding display device of the present application and a partially enlarged view thereof;

FIG. 8 is a perspective view of the balance control mechanism and damping mechanism of the present application;

FIG. 9 is a perspective view of the equalization control mechanism of the present application;

FIG. 10 is an exploded perspective view of the equalization control mechanism of the present application;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 9;

FIG. 12 is a perspective view of a first hinge assembly of the folding display apparatus of the present application;

FIG. 13 is a perspective view of a second hinge assembly of the folding display apparatus of the present application;

fig. 14 is a perspective view of a third hinge assembly of the foldable display device of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings.

Referring to fig. 1 to 7, the communication device of the present application includes a pair of housings 10, a pair of folding plates 20 disposed opposite to the housings 10, an inner folding hinge 30 hinged to the housings 10, an outer folding hinge 40 hinged to the folding plates 20, a balance control mechanism 50 connecting the inner folding hinge 30 and the outer folding hinge 40, a damping mechanism 70 cooperating with the balance control mechanism 50, a plurality of

hinge assemblies

70, 80, 90 for hinging the outer folding hinge 40 together, a flexible screen (not shown) attached to the folding plates 20 and the outer folding hinge 40, and an electronic component assembled between the housings 10 and the folding plates 20. The inner folding hinge 30 and the outer folding hinge 40 constitute a folding hinge.

The pair of housings 10 includes a first housing 10a and a second housing 10b, and the pair of folding plates 20 includes a first plate portion 20a and a second plate portion 20 b.

The position of the flexible screen corresponding to the folding plate 20 is fixed with the folding plate 20 into a whole, and the position of the flexible screen corresponding to the outer folding hinge 40 is not fixed with the outer folding hinge 40. When folded, a pair of the housings 10 are attached relatively close together, and the flexible screen is located on the outer side of a pair of the folding plates 20. The outer folding hinge 40 is folded into an arc structure, and the flexible screen is located at the outer surface of the outer folding hinge 40 and folded into an arc structure along with the outer folding hinge 40. The inner folding hinge 30 is folded into an arcuate configuration. An equalization control mechanism 50 located between the inner folding hinge 30 and the outer folding hinge 40 controls the equalization folding along both side portions of the folding axis.

The first and

second housings

10a and 10b respectively include a base portion 11, a side wall 12 formed to protrude from the outer periphery of the base portion 11, a groove structure 13 formed on the side of the side wall base portion 11 close to the inner folding hinge 30, and a plurality of fixing holes 15 formed on the surface of the base portion 11 and fixed to the folding plate 20. The first and

second housings

10a, 10b are fixed to the first and

second folding plates

20a, 20b by rivets.

A pair of sliding seats 14 are respectively disposed at positions of the first and

second housings

10a, 10b close to the slot structure 13, and each sliding seat 14 includes a seat body 141, seat arms 143 formed by protruding from two longitudinal sides of the seat body 141, a sliding slot 142 formed between the pair of seat arms 143, and a sliding rail slot 144 opened on the seat arm 143. The side of the seat arm 143 facing the outer folding hinge 40 is spring 145.

Referring to fig. 4 and 5, the inner folding hinge 30 includes first and second

inner flaps

31a and 31b and a connecting shaft 32 connecting the first and second

inner flaps

31a and 31 b. The first and second

inner folding plates

31a and 31b include inner folding plate bodies 311, a rotation shaft 313 is disposed on one longitudinal side of the outer ends of the inner folding plate bodies 311, the outer ends of the inner folding plate bodies 311 are accommodated in the groove structures 13 of the first and

second shells

10a and 10b, and an arc-shaped groove 312 is disposed on one side of the inner folding plate bodies 311 close to the connecting shaft 32. The connecting shaft 32 includes a shaft body 321, arc protrusions 323 disposed at two lateral ends of the shaft body 321, a groove 322 disposed on an outer side surface of the shaft body 321, and a fixing hole 324 formed by protruding from an inner side surface of the shaft body 321. When the first and second

inner folding plates

31a and 31b are folded, the end portions of the first and second

inner folding plates

31a and 31b near one side of the groove structure 13 are folded into the groove structure 13 to avoid the position. The rotating shaft 313 at the outer end of the first and second

inner folding plates

31a and 31b is limited on the outer folding hinge 40, a limiting mechanism 314 (shown in fig. 6) matched with the rotating shaft 313 is arranged on the outer folding hinge 40, and a hole structure with a certain length is arranged on the limiting mechanism 314 and matched with the rotating shaft 313.

Referring to fig. 6 and 7, the external folding hinge 40 includes a main shaft 43, first and second

external folding strips

42a and 42b located at two lateral sides of the main shaft 43, and first and second

external folding plates

41a and 41b located outside the first and second

external folding strips

42a and 42 b. The first and second

outer folding plates

41a,41b include an outer folding plate 411 and a sliding plate 412 extending from the outer side of the outer folding plate 411 to the inside of the sliding slot 142 to be engaged with the sliding rail groove 144. The sliding plate 412 is provided with a limiting hole 413, and the sliding plate 412 is provided with spring grooves 414 for accommodating the springs 145 at two longitudinal sides. A limiting column (not numbered) accommodated in the limiting hole 413 is arranged in the sliding groove 142, and the outer diameter of the limiting column is smaller than the inner diameter of the limiting hole 413, so that a movement gap exists between the limiting column and the limiting hole 413. The slide rail groove 144 is sleeved with a silica gel sleeve to reduce the sound caused by metal friction.

The first and second

outer folding strips

42a,42b have a width smaller than the width of the first and second

outer flaps

41a,41 b. The main shaft 43 includes a first sector 432 formed by protruding toward the inner folding hinge 30 at the inner side of both longitudinal ends, a first protrusion 434 formed by protruding outward from the middle of the outer side of the first sector 432, and first sector accommodations 433 formed at both lateral sides of the first protrusion 434 and located at the outer side of the first sector 432 in the longitudinal direction. The first and second

outer folding strips

42a,42b include a second sector-shaped receiving portion 422 formed at a position close to the first sector-shaped portion 432 inside both longitudinal ends, a second sector-shaped portion 423 located outside the second sector-shaped receiving portion 422, a second protrusion 424 formed at a longitudinal outer end of the second sector-shaped receiving portion 422, and a third sector-shaped receiving portion 425 located outside the second sector-shaped portion 423. A fourth sector holding portion 415 and a sector side wall 416 formed outside the fourth sector holding portion 415 are provided on the first and second

outer flaps

41a and 41b on a side close to the third sector holding portion 425.

When folded, first segment 432 folds into second segment receptacle 422, second tab 424 folds into first segment receptacle 433, second segment 423 folds into fourth segment receptacle 415, and segment side wall 416 folds into third segment receptacle 425. Therefore, the longitudinal outer sides of the outer folding hinge 40 and the inner folding hinge 40 are closed, and the appearance is prevented from being influenced by gaps.

Referring to fig. 6, 7, and 12 to 14, the main shaft 43, the first and second

outer folding strips

42a and 42b, and the first and second

outer folding plates

41a and 41b have screw holes on their sides facing the inner folding hinge 30. The main shaft 43, the first and second

outer folding strips

42a and 42b and the first and second

outer folding plates

41a and 41b are hinged together by the

hinge assemblies

70, 80 and 90. The hinge assembly includes a first hinge assembly 70, a second hinge assembly 80, and a third hinge assembly 90. The main shaft 43 and the first and second

outer folding strips

42a,42b are hinged together by at least two sets of first hinge assemblies 70, each first hinge assembly 70 comprises a first hinge seat 71 fixed on the main shaft 43 and two second hinge seats 72 fixed on the first and second

outer folding strips

42a,42b, each first hinge seat 71 comprises a first fixed base 711 provided with a screw hole, a pair of first cams 712 extending from two longitudinal ends of the first fixed base 711 to transversely opposite directions, and a protruding shaft 713 protruding from two longitudinal ends of the first cams 712. The second hinge base 72 includes a second fixed base portion 721 provided with a screw hole, a second cam 722 formed by extending from one side of the second fixed base portion 721 toward one side of the main shaft 43, and an arc-shaped groove 723 formed in the second cam 722, and the protruding shaft 713 is limited by the arc-shaped groove 723 for rotation. The first and second

outer folding strips

42a,42b are hinged to the first and second

outer flaps

41a,41b by second hinge assemblies 80, the second hinge assemblies 80 including a first hinge seat 71 fixed to the first or second

outer flap

41a,41b and a second hinge seat 72 fixed to the first or second

outer folding strip

42a,42b, with the difference that the first hinge seat 71 is provided with only one first cam 712 cooperating with a second cam 722 of the second hinge seat 72. Third hinge subassembly 90 is used for strengthening the main shaft 43 with the wholeness of first, the outer strip 42a of second, 42b, third hinge subassembly 90 is including being fixed in third hinge seat 91 and two are fixed in on the main shaft 43 first, the outer strip 42a of second, the articulated seat 92 of fourth on the 42b, first hinge seat 91 is including the third fixed basal portion 911 that is equipped with the screw hole and certainly the protruding axle 912 that the vertical protrusion in third fixed basal portion 911 both sides formed, the articulated seat 92 of second is including the fourth fixed basal portion 921 that is equipped with the screw hole, certainly the third cam 922 that the horizontal both sides of fourth fixed basal portion 921 extended the formation and set up in third cam 922 with protruding axle 912 complex arc wall 923.

A first hinge base 71 is separately fixed on the first and second

outer folding plates

41a,41b, and an arc-shaped groove matched with the protruding shaft 713 is arranged on the first and second

inner folding plates

31a, 31b corresponding to the first hinge base 71 so that the first and second

outer folding plates

41a,41b and the first and second

inner folding plates

31a, 31b are hinged into a whole to rotate.

Referring to fig. 6 to 11, the balance control mechanism 50 includes a pair of first

rotating shafts

51a and 51b, a pair of second

rotating shafts

52a and 52b located between the first

rotating shafts

51a and 51b, an internal gear 55 for combining the pair of second

rotating shafts

52a and 52b, a pair of

external gears

58a and 58b fixed to the pair of first

rotating shafts

52a and 52b, respectively, and engaged with the internal gear 55, and two pairs of connecting

gears

54a and 54b for combining the first rotating shaft 51a (51b) and the second rotating shaft 52a (52b) into a whole.

The internal gear 55 includes a fixing hole (not numbered) sleeved outside the pair of second

rotating shafts

52a, 52b and a tooth structure (not numbered) disposed on both lateral sides of the internal gear 55. Each of the pair of

outer gears

58a and 58b includes an arm portion 581, a fixing hole 583 formed at one end of the arm portion 581 and fixedly fitted to the outside of the first

rotating shafts

51a and 51b, a tooth structure 584 formed outside the fixing hole 583 and engaged with the tooth structure of the inner gear 55, and a connecting shaft hole 582 formed at the other end of the arm portion 581. The inner gear 55 has lateral sides corresponding to the pair of

outer gears

58a,58b, and when the

outer gears

58a,58b rotate, the inner gear 55 is rotated and the pair of second

rotating shafts

52a, 52b and the pair of first

rotating shafts

51a, 51b are forced to move relatively in the vertical direction. The two pairs of the connecting

gears

54a,54b sandwich the internal gear 55 and the

external gears

58a,58b, respectively, in the longitudinal direction. The connecting

gears

54a and 54b include connecting

shaft holes

541 and 542 respectively sleeved outside the first rotating shaft 51a (51b) and the second rotating shaft 52a (52b) and a tooth structure 543 arranged at one side of the second

rotating shafts

52a and 52b, and the tooth structures 543 of the pair of connecting

gears

54a and 54b are engaged with each other. The coupling shaft holes 541, 542 of the coupling gears 54a,54b are rotatable about the first

rotating shafts

51a, 54b and the second

rotating shafts

52a, 52b, respectively.

The balance control mechanism 50 further includes a fixing block 56 fixed to the outside of the pair of second

rotating shafts

52a, 52b, and the fixing block 56 is fixed to the main shaft 43 of the outer folding hinge 40 by a screw. The two fixing blocks 56 are respectively located at the two longitudinal ends of the two pairs of connecting

gears

54a,54 b. The balance control mechanism 50 is further provided with a plurality of groups of damping fins 57, wherein one group of damping fins 57 is connected to one pair of the second

rotating shafts

52a and 52b, and one group of damping fins 57 is connected to one pair of the first

rotating shafts

51a and 51b respectively corresponding to the second

rotating shafts

52a and 52 b. The balance control mechanism 50 further includes four limiting blocks 53 fixed to the first and second

outer folding strips

42a,42b of the outer folding hinge 40, and each limiting block 53 includes a limiting end 531 and a limiting groove 532 for the free end of the first

rotating shaft

51a, 51b to be sleeved in for limiting. In an embodiment, the stop block 53 may be integrally formed with the first and second

outer folding strips

42a,42 b.

The damper mechanism 60 includes a first damper base 61 and a second damper base 62 fixed to the first and second

outer flaps

41a,41b, a shaft 615 slidably provided in the first damper base 61 and connected to the connecting shaft hole 582 of the outer gear 58a (58b), a slider 63 movable in the longitudinal direction with respect to the second damper base 62, and an elastic member 625 sandwiched between the slider 63 and the second damper base 62. An interference is generated between the slider 63 and the shaft 615. The first damper seat 61 includes a first rivet portion 611 fixed to the first or second

outer flap

41a,41b by a screw, two moving groove arms 612 formed to extend from the first rivet portion 611 toward the

outer gear

58a,58b, a moving space 613 formed between the moving groove arms 612, and a moving groove 614 opened in the moving groove arms 612 and having a certain length in the transverse direction. The shaft 615 moves within the moving slot 614, and the shaft 615 further includes a bulbous end 616 that extends longitudinally out of the moving slot 614. One end of the coupling shaft hole 582 of the

outer gears

58a,58b is located in the moving space 612 and is movable in the moving space 614 as the shaft 615 moves in the moving groove 614. The second damper seat 62 includes a second rivet portion 621 fixed to the first and second

outer flaps

41a and 41b, a pair of slide groove arms 622 formed to extend from the second rivet portion 621 toward the first damper seat 61, and a slide space 623 formed between the pair of slide groove arms 622. The inner side of the sliding slot arm 622 is provided with a track groove 624, the outer side of the sliding block 63 corresponding to the track groove 624 is provided with a sliding convex rail (not shown), the sliding convex rail slides in the track groove 624, and the elastic member 625 is located in the sliding space 623 and applies an elastic force to the sliding block 63. The slider 63 includes a slider main body 631, an extension portion 632 located outside the sliding space 623, and a bump 633 formed by extending from an end of the extension portion 632. Inclined surfaces 634 are arranged on two lateral sides of the bump 633, the inclined surfaces 634 are matched with the spherical end 616 of the shaft 615, when the spherical end 616 crosses the bump 633, the spherical end is in an unfolding state and a folding state respectively, and the hand feeling can be prompted to be unfolded in place or the folding is finished.

When folding, the first and

second shells

10a, 10b and the first and

second folding plates

20a, 20b rotate relatively, so that the arm portions 581 of the

external gears

58a,58b move around the shaft 615 to force the first

rotating shafts

51a, 51b to rotate, and the connecting

gears

54a,54b ensure that the first

rotating shafts

51a, 51b rotate uniformly on both sides, and the first

rotating shafts

51a, 51b move relatively with respect to the second

rotating shafts

52a, 52b and overlap at least partially in the vertical direction to realize folding. During this process, the spherical end 616 of the shaft 615 passes over the bump 633 to indicate that the folding is complete, and vice versa.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A folding hinge is characterized by comprising an inner folding hinge and an outer folding hinge, wherein the outer folding hinge comprises a main shaft, a first outer folding strip and a second outer folding strip which are positioned at two transverse sides of the main shaft, a first outer folding plate and a second outer folding plate which are positioned outside the first outer folding strip and the second outer folding strip, and a hinge assembly which hinges the main shaft, the first outer folding strip and the second outer folding strip together with the first outer folding plate and the second outer folding plate, the outer folding hinge comprises a connecting shaft and a first inner folding plate and a second inner folding plate which are positioned at two transverse sides of the connecting shaft and are rotatably connected with the connecting shaft, rotating shafts are arranged at four corners of the first inner folding plate and the second inner folding plate, limiting mechanisms for rotating the rotating shafts are arranged corresponding to the rotating shafts, the limiting mechanisms are provided with hole structures for moving the rotating shafts, the rotating shafts move along the transverse directions of the hole structures, and a balance control mechanism is arranged between the inner folding hinge and the outer folding hinge, the balance control mechanism is connected with the first inner folding plate and the second inner folding plate to rotate.

2. The folding hinge of claim 1, wherein the main shaft of the external folding hinge, the first and second external folding strips, and the first and second external folding plates have longitudinal ends that are formed to protrude in a vertical direction to form a plurality of sectors and a sector receiving portion for receiving the sectors, the connecting shaft of the internal folding hinge and the longitudinal ends of the first and second internal folding plates are located inside the sectors, the first and second external folding strips and the first and second external folding plates are folded or unfolded by the hinge assembly, the sectors are received in the sector receiving portion to form a closed longitudinal end when folded, and the sectors are only partially received in the sector receiving portion to form a closed longitudinal end when unfolded.

3. The folding hinge according to claim 2, wherein said main shaft includes a first sector portion formed to protrude from the inner side of both longitudinal ends thereof along a direction perpendicular to the surface of said main shaft, a first protrusion portion formed to protrude outward from the middle of the outer side of said first sector portion, and a first sector receiving portion formed on both lateral sides of said first protrusion portion and located on the outer side of said first sector portion in the longitudinal direction, said first and second outer folding strips include a second sector receiving portion formed on the inner side of both longitudinal ends thereof at a position close to said first sector portion, a second sector portion located on the outer side of said second sector receiving portion, a second protrusion portion formed on the outer end of said second sector receiving portion in the longitudinal direction, and a third sector receiving portion located on the outer side of said second sector portion, said first and second outer folding plates have a fourth sector receiving portion and a sector side wall formed on the outer side of said fourth sector receiving portion, when the folding type fan-shaped part is folded, the first fan-shaped part is folded into the second fan-shaped accommodating part, the second convex part is folded into the first fan-shaped accommodating part, the second fan-shaped part is folded into the fourth fan-shaped accommodating part, and the fan-shaped side wall is folded into the third fan-shaped accommodating part.

4. The folding hinge according to claim 3, wherein the balance control mechanism includes a pair of first rotating shafts fixed to the main shaft, a pair of second rotating shafts located between the pair of first rotating shafts and connected to each other through an internal gear, a connecting gear connecting the adjacent one of the first rotating shafts to the one of the second rotating shafts, and an external gear fixed to the first rotating shaft and engaged with the internal gear, respectively, the internal gear including a fixing hole fixing the pair of second rotating shafts and a tooth structure located on a lateral outer side of the internal gear, respectively, the external gear including an arm portion, a fixing hole formed at a first end of the arm portion and fixed to an outer side of the first rotating shaft, another tooth structure engaged with the tooth structure of the internal gear located outside the first end of the arm portion, and a connecting shaft hole provided at a second end of the arm portion and connected to the shaft lever, the connecting gear comprises connecting shaft holes respectively sleeved outside the first rotating shaft and the second rotating shaft and a tooth structure meshed between the pair of second rotating shafts, the connecting gear is fixed with the first rotating shaft and can rotate relative to the second rotating shaft, and the position of the pair of second rotating shafts is fixed; the second ends of the arms are pivotally connected to the first and second outer flaps.

5. The folding hinge of claim 4, wherein said first and second exterior flaps are provided with a damping mechanism coupled to said second end of said arm, the damping mechanism comprises a first damping seat and a second damping seat which are fixed in relative positions in the longitudinal direction, a moving groove transversely formed on the first damping seat, a shaft rod capable of moving transversely to the moving groove and a sliding block facing the first damping seat and elastically sliding on the second damping seat, the shaft rod comprises a spherical end part protruding out of the moving groove towards the sliding block, the sliding block is formed with a convex block protruding towards the spherical end part, inclined surfaces are formed on two transverse sides of the protruding block, the spherical end part can cross the protruding block along the inclined surfaces in the moving process, the spherical end part is switched between two states on two transverse sides of the protruding block, and the second end of the arm part is in rotary connection with the shaft rod.

6. The folding hinge as claimed in claim 5, wherein the second damping seat includes a second rivet portion for fixing, a pair of sliding slot arms formed by extending from the second rivet portion toward the first damping seat, and a sliding space formed between the pair of sliding slot arms, a track slot is formed at an inner side of the sliding slot arm, the slider is sleeved in the track slot at both lateral sides and moves longitudinally in the sliding space, an elastic member is clamped between the slider and the second rivet portion, and the elastic member applies an elastic force to the slider.

7. The folding hinge according to claim 6, wherein said slider further comprises a slider body and an extended portion located outside said sliding space, said projection being formed to project from said extended portion toward said spherical end portion; the first damping seat further comprises a first riveting part fixed through a screw and a pair of moving groove arms formed by transversely extending the first riveting part, the moving grooves are formed in the moving groove arms, and the shaft rod transversely moves in the moving grooves.

8. The folding hinge according to claim 5, wherein when said pair of external gears rotate, said pair of first rotating shafts is displaced relative to said second rotating shafts until a projection of said pair of first rotating shafts and a projection of said pair of second rotating shafts in a vertical direction at least partially coincide.

9. The folding hinge according to claim 8, wherein a pair of said outer gears are respectively located at both lateral sides of said inner gear, and said connecting gears are respectively provided with two pairs of said connecting gears engaged with each other at both longitudinal ends of said inner and outer gears.

10. A foldable display device comprising the folding hinge of any one of claims 1-9, first and second folding panels disposed on lateral sides of the first and second outer flaps, first and second housings disposed on lateral sides of the first and second inner flaps, and a flexible screen attached to an outer side of the first and second folding panels, wherein the flexible screen is not adhesively secured to the outer folding hinge.