CN217181460U - Rotating shaft mechanism, folding machine shell and keyboard - Google Patents

Abstract

The utility model discloses a pivot mechanism, folding casing and keyboard, pivot mechanism wherein includes: the bearing is arranged in a bearing sleeve, and one end of the bearing is a mounting part; the first torsion unit is arranged in the bearing sleeve and sleeved at the other end, far away from the mounting part, of the bearing; the first torsion unit comprises a first mounting piece, a torsion spring and a second mounting piece, and the first mounting piece is fixed in the bearing sleeve; one end of the torsion spring is mounted on the first mounting part, the other end of the torsion spring is mounted on the second mounting part, the bearing can rotate in the first mounting part, and the second mounting part and the bearing rotate synchronously; when the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing; when the bearing rotates towards the second direction, the torsion force of the torsion spring is gradually increased along with the rotation of the bearing. The utility model provides a mechanism can make the electronic equipment who is equipped with it easily open, and when opening to great angle, has better organism location effect.

Description

Rotating shaft mechanism, folding machine shell and keyboard

Technical Field

The utility model relates to an electronic equipment technical field especially involves a pivot mechanism, folding casing and keyboard.

Background

The rotating shaft is also called as a pivot device or a rotating hinge, is a connecting element capable of providing relative rotation, and is widely applied to various digital products, electronic equipment and derivative products thereof at present, such as electronic equipment like a notebook computer, and the like, and the functions of opening and closing, rotating positioning and self-closing between a display screen part and a base body part of the notebook computer and the like are realized through the relative rotation function provided by the rotating shaft; as for the supporting case or the external keyboard of the mobile phone, the tablet personal computer, etc., the functions of opening and closing, rotational positioning and self-closing between the supporting plate and the base (or the keyboard body) are realized through the relative rotation function provided by the rotating shaft.

With the pursuit of light and portability of the products, higher requirements are put forward on each part in the electronic equipment and the derivative products thereof, and particularly, the rotary hinge has the requirement of small structural volume, and simultaneously can enable the notebook or the supporting machine shell to be opened and closed by one hand, and can have the requirement of ideal machine body positioning effect when being opened to a certain angle, namely, different requirements are put forward on the magnitude of the torsion generated by the rotary shaft mechanism in the whole rotating process.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in solving the pivot mechanism among the prior art and can not satisfy the structure volume simultaneously less, and the problem of the different demand of torsion that produces at whole rotatory in-process provides a pivot mechanism, folding casing and keyboard.

To this end, according to a first aspect, the present invention provides a pivot mechanism, comprising:

the bearing is arranged in a bearing sleeve, and one end of the bearing is a mounting part;

the first torsion unit is arranged in the bearing sleeve and sleeved at the other end, far away from the mounting part, of the bearing; the first torsion unit comprises a first mounting piece, a torsion spring and a second mounting piece, and the first mounting piece is fixed in the bearing sleeve; one end of the torsion spring is mounted on the first mounting part, the other end of the torsion spring is mounted on the second mounting part, the bearing can rotate in the first mounting part, and the second mounting part and the bearing rotate synchronously;

when the bearing rotates towards the first direction, the torsion of the torsion spring is gradually reduced along with the rotation of the bearing; when the bearing rotates towards the second direction, the torsion force of the torsion spring is gradually increased along with the rotation of the bearing.

Furthermore, a first protruding portion is arranged on the first mounting piece, a first groove portion corresponding to the first protruding portion is arranged in the bearing sleeve, and the first protruding portion is clamped in the first groove portion to limit rotation of the first mounting piece.

Furthermore, first torsion unit still includes the torsion spring sleeve, and the torsion spring sleeve cover is located outside the bearing, and the torsion spring cover is located outside the torsion spring sleeve, and the torsion spring sleeve is used for restricting the radial deformation of torsional spring.

Further, this pivot mechanism still includes:

the second torsion unit is sleeved outside the bearing and is positioned between the first torsion unit and the mounting part;

the second torsion unit comprises a first limiting piece, a second limiting piece and a torsion piece arranged between the first limiting piece and the second limiting piece, and the torsion piece comprises a plurality of elastic pieces;

the first limiting piece and the second limiting piece rotate synchronously with the bearing, and the second torsion unit generates torsion based on friction between the first limiting piece and the torsion piece and extrusion of the first limiting piece and the second limiting piece on the torsion piece.

Further, this pivot mechanism still includes:

the third limiting piece is sleeved outside the bearing and is close to the second limiting piece, the third limiting piece is fixed in the bearing sleeve, and the bearing can rotate in the third limiting piece; the end part of the third limiting piece close to the second limiting piece is provided with a second groove part, and the second limiting piece is provided with a second protruding part corresponding to the second groove part;

when the bearing rotates towards the first direction and rotates to a first preset angle, the second protruding portion slides into the second groove portion to limit the bearing to rotate continuously towards the first direction.

Furthermore, a limit block is arranged at the end part of the third limit part far away from the second limit part, and a second limit block corresponding to the first limit block is fixed on the bearing; when the bearing rotates to a second preset angle, the second limiting block is abutted to the first limiting block so as to limit the rotation of the bearing.

According to a second aspect, the utility model provides a folding chassis for support mobile terminal, it includes:

the base, backup pad and as above-mentioned first aspect pivot mechanism, the base is connected with bearing housing external fixation's first connecting piece, and the backup pad is connected with the second connecting piece of fixing on the installation department of bearing.

Further, the support plate includes:

one end of the first plate body is connected with the second connecting piece, and the other end of the first plate body is hinged with the second plate body through a damping rotating shaft; the first plate body can rotate towards the first direction based on the rotating shaft mechanism and has a maximum opening state of rotating to a third preset angle relative to the base, and the second plate body can rotate towards the first direction based on the damping rotating shaft and has a maximum opening state of rotating to a fourth preset angle relative to the first plate body;

when the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the first direction to be opened, the first plate body reaches the maximum opening state before the second plate body; when the bearing rotates towards the second direction, the torsion of the torsion spring is gradually increased along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the second direction to be closed, the second plate body reaches a closed state before the first plate body.

According to a third aspect, the present invention provides a keyboard, comprising:

the keyboard body, backup pad and as above-mentioned first aspect pivot mechanism, the keyboard body is connected with bearing housing external fixation's first connecting piece, and the backup pad is connected with the second connecting piece of fixing on the installation department of bearing.

Further, the support plate includes:

one end of the first plate body is connected with the second connecting piece, and the other end of the first plate body is hinged with the second plate body through a damping rotating shaft; the first plate body can rotate towards the first direction based on the rotating shaft mechanism and has a maximum opening state of rotating to a third preset angle relative to the keyboard body, and the second plate body can rotate towards the first direction based on the damping rotating shaft and has a maximum opening state of rotating to a fourth preset angle relative to the first plate body;

when the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the first direction to be opened, the first plate body reaches the maximum opening state before the second plate body; when the bearing rotates towards the second direction, the torsion of the torsion spring is gradually increased along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the second direction to be closed, the second plate body reaches a closed state before the first plate body.

The technical scheme provided by the utility model, following advantage has:

1. the utility model provides a rotating shaft mechanism, which provides a foundation for fixing the parts sleeved by the bearing by arranging the bearing in the bearing sleeve; the torsion spring with one end fixed on the first mounting piece and the other end fixed on the second mounting piece can be twisted in the rotation process of the bearing by arranging the first torsion unit comprising the first mounting piece, the second mounting piece and the torsion spring, and arranging the first mounting piece fixed in the bearing sleeve (the bearing can rotate in the bearing), wherein the second mounting piece and the bearing rotate synchronously, so that different torsion forces are generated; specifically, the torsion spring may be disposed such that when the bearing rotates toward the first direction, the generated torsion force is gradually reduced along with the rotation of the bearing, and when the bearing rotates toward the second direction, the generated torsion force is gradually increased along with the rotation of the bearing, so that the device equipped with the rotating shaft mechanism is easily opened at an initial stage of being rotated and opened along the first direction based on the small torsion force generated by the rotating shaft mechanism, and when the device is continuously rotated and opened to a large angle along the first direction, the device has a good body positioning effect based on the large torsion force generated by the rotating shaft mechanism.

2. The utility model provides a support casing through setting up pivot mechanism wherein, and torsion is less when making the backup pad for the rotatory less angle of base, and torsion is great when rotatory great angle to make this support casing need exert force less at the initial stage that the user opened, easily open, and have better organism location effect because the great torsion that pivot mechanism produced when opening great angle.

3. The utility model provides a support casing, through setting up the backup pad wherein to include first plate body and second plate body, and set up that first plate body articulates with the base through pivot mechanism, the second plate body articulates with first plate body through a damping pivot, and make first plate body can be based on pivot mechanism orientation first direction rotation, and have the biggest open mode of rotatory to third preset angle relative to the base, the second plate body can be based on damping pivot orientation first direction rotation, and have the biggest open mode of rotatory to fourth preset angle relative to first plate body; when the first plate body and the second plate body are further rotated towards the first direction to be opened, the first plate body reaches the maximum opening state before the second plate body (based on the fact that the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing, so that when the first plate body is opened to a large angle, the torsion force generated by the rotating shaft mechanism can be smaller than the torsion force of the damping rotating shaft), when the first plate body and the second plate body are rotated towards the second direction to be closed, the second plate body reaches the closed state before the first plate body (based on the fact that the bearing rotates towards the second direction, the torsion force of the torsion spring is gradually increased along with the rotation of the bearing, so that when the first plate body is opened to a small angle, the torsion force generated by the rotating shaft mechanism can be larger than the torsion force of the damping rotating shaft), and therefore the supporting case can better meet the use requirements of users.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a keyboard according to an embodiment of the present invention;

fig. 2 and fig. 3 are schematic structural views of a rotating shaft mechanism provided in an embodiment of the present invention;

fig. 4 is a schematic view of a structure in a bearing housing in a rotating shaft mechanism according to an embodiment of the present invention;

FIG. 5 is an exploded view of the structure of FIG. 2;

fig. 6 is a schematic view of a connection relationship between a first mounting member and a bearing sleeve according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second limiting part and a third limiting part according to an embodiment of the present invention;

description of reference numerals:

1-a keyboard body;

21-a first plate body; 22-a second plate body; 23-damping rotating shaft;

3-a rotating shaft mechanism;

31-a bearing; 31 a-a mounting portion; 31 b-a second stopper;

32-a bearing sleeve; 32 a-a first groove portion;

33-a first torque unit; 331-a first mount; 331 a-first projection; 332-torsion spring; 333-a second mount; 334-torsion spring sleeve;

34-a second torsion unit; 341-first limit stop; 342-a second stop; 342 a-a second projection; 343-torsion member; 344-friction plate;

35-a third limiting member; 35 a-a second groove portion; 35 b-a first stopper;

36-a first connector; 37-second connecting member.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

The embodiment of the utility model discloses keyboard, it includes: the keyboard comprises a keyboard body, a supporting plate and a rotating shaft mechanism, wherein the keyboard body is connected with a bearing sleeve of the rotating shaft mechanism (specifically, connected with a first connecting piece fixed outside the bearing sleeve), the supporting plate is connected with a bearing of the rotating shaft mechanism (specifically, connected with a second connecting piece connected on an installation part at one end of the bearing), and the supporting plate can rotate relative to the keyboard body based on the rotating shaft mechanism. Specifically, at this time, the supporting plate is set to be closed when rotating towards the first direction and to be opened when rotating towards the second direction, based on that when a bearing in the rotating shaft mechanism rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing, and when the bearing rotates towards the second direction, the torsion force of the torsion spring is gradually increased along with the rotation of the bearing (the specific structure of the rotating shaft mechanism is described in detail below), so that the supporting plate in the keyboard rotates relatively to the base for a small angle, and rotates relatively to a large angle for a large angle, and the force required to be applied to the supporting case at the initial stage of opening by a user is small, and the supporting case is easy to open, and when opening a large angle, the large torsion force generated by the rotating shaft mechanism has a good body positioning effect.

The embodiment of the utility model provides a still disclose a support casing, it is for above-mentioned keyboard, and what the difference only lies in being connected with the bearing housing external fixation's first connecting piece is a base.

The embodiment of the utility model discloses another keyboard, please refer to fig. 1-7, it includes equally: the keyboard comprises a keyboard body 1, a supporting plate and a rotating shaft mechanism 3, wherein the keyboard body 1 is connected with a bearing sleeve 32 of the rotating shaft mechanism 3, and the difference is that the supporting plate in the keyboard comprises a first plate body 21 and a second plate body 22, one end of the first plate body 21 is connected with a second connecting piece 37, and the other end of the first plate body is hinged with the second plate body 22 through a damping rotating shaft 23.

Specifically, as shown in fig. 1, the first plate 21 and the second plate 22 are configured to be opened when rotated in the first direction and closed when rotated in the second direction; the first board 21 can rotate towards the first direction based on the rotating shaft mechanism 3 and has a maximum opening state of rotating to a third preset angle relative to the keyboard body 1, and the second board 22 can rotate towards the first direction based on the damping rotating shaft 23 and has a maximum opening state of rotating to a fourth preset angle relative to the first board 21; when the bearing 31 rotates in the first direction, the torsion force of the torsion spring 332 gradually decreases along with the rotation of the bearing 31, and the first plate 21 and the second plate 22 rotate in the first direction to be opened (when the bearing 31 rotates in the first direction, the torsion force of the torsion spring 332 gradually decreases along with the rotation of the bearing 31, so that when the first plate 21 is opened to a large angle, the torsion force generated by the rotating shaft mechanism 3 can be smaller than the torsion force of the damping rotating shaft 23) the first plate 21 reaches the maximum opening state before the second plate 22; when the bearing 31 rotates in the second direction, the torsion of the torsion spring 332 gradually increases along with the rotation of the bearing 31, and the first board 21 and the second board 22 rotate in the second direction to close (when the bearing 31 rotates in the second direction, the torsion of the torsion spring 332 gradually increases along with the rotation of the bearing 31, so that when the first board 21 is closed to a smaller angle, the torsion generated by the rotating shaft mechanism 3 can be greater than the torsion of the damping rotating shaft 23), the second board 22 reaches a closed state before the first board 21, and thus the keyboard better meets the use requirements of users.

In the present application, in order to enable the first board body 21 and the second board body 22 in the keyboard to have a better stability when both reach the maximum open state, the third preset angle is generally set to be smaller than 90 degrees, and the sum of the third preset angle and the fourth preset angle is greater than 90 degrees, for example, the third preset angle may be set to be 70 degrees, and the fourth preset angle may be set to be 50 degrees (i.e., the sum of the third preset angle and the fourth preset angle is 120 degrees), and the like.

The embodiment of the utility model provides a still disclose a support casing, it is for above-mentioned keyboard, and the difference only is being connected in the first connecting piece 36 with bearing housing 32 external fixation for a base.

Referring to fig. 2-5, a hinge mechanism 3 disclosed in an embodiment of the present invention can be applied to the keyboard and the supporting housing, and the hinge mechanism 3 includes: a bearing 31, a bearing housing 32 and a first torque unit 33.

Specifically, as shown in fig. 3 to 5, the bearing 31 is disposed in the bearing housing 32, and one end of the bearing 31 is a mounting portion 31a, the mounting portion 31a is used for mounting the second connecting member 37 in the keyboard and the supporting housing, and the first connecting member 36 is fixed outside the bearing housing 32. As shown in fig. 3, in order to facilitate the installation of the second connection member 37, an end portion of the bearing housing 32 corresponding to the installation portion 31a may be provided with a through hole, and the installation portion 31a may extend out of the bearing housing 32 through the through hole.

Specifically, as shown in fig. 4 and 5, the first torsion unit 33 is disposed in the bearing housing 32 and is sleeved at the other end of the bearing 31 away from the mounting portion 31a, and the first torsion unit 33 includes a first mounting member 331, a torsion spring 332 and a second mounting member 333, wherein the first mounting member 331 is fixed in the bearing housing 32, the bearing 31 is rotatable in the first mounting member 331, and the second mounting member 333 is rotated synchronously with the bearing 31; one end of the torsion spring 332 is mounted on the first mounting part 331, and the other end is mounted on the second mounting part 333, and when the bearing 31 rotates towards the first direction, the torsion force of the torsion spring 332 gradually decreases along with the rotation of the bearing 31; when the bearing 31 rotates in the second direction, the torsion force of the torsion spring 332 gradually increases with the rotation of the bearing 31.

In the present application, as shown in fig. 5 and 6, a first protrusion 331a may be disposed on the first mounting member 331, and a first groove 32a corresponding to the first protrusion 331a may be disposed in the bearing housing 32, and the first protrusion 331a may be engaged with the first groove 32a to limit the rotation of the first mounting member 331, so as to achieve a fixed connection between the first mounting member 331 and the bearing housing 32. It should be noted that, the fixing here mainly means fixing that restricts the rotation of the first mounting piece 331 relative to the bearing housing 32, and the movement of the first mounting piece 331 relative to the bearing housing 32 is not strictly restricted, for example, the first groove portion 32a may be provided to extend to an end portion (an end far from the mounting portion 31 a) of the bearing housing 32, so that the first mounting piece 331 may slide into the bearing housing 32 from the end portion and stop at a specified position (the first groove portion 32a may be provided so as not to extend when reaching the specified position) in a state that the first projecting portion 331a thereof is caught in the first groove portion 32a, thereby realizing the mounting of the first mounting piece 331 (fig. 6 shows this case); in this case, an end cap may be correspondingly disposed at the end portion.

In the present application, in order to prevent the torsion spring 332 from generating radial deformation to affect the performance of the rotating shaft mechanism 3, please refer to fig. 5, the first torsion unit 33 may further include a torsion spring sleeve 334, the torsion spring sleeve 334 is sleeved outside the bearing 31, the torsion spring 332 is sleeved outside the torsion spring sleeve 334, and the torsion spring sleeve 334 is used to limit the radial deformation of the torsion spring 332.

In this application, in order to enable the minimum torque of the rotating shaft mechanism 3 during the rotation process to enable the corresponding keyboard (or the supporting housing) to have a certain hovering capability, as shown in fig. 4 and fig. 5, the rotating shaft mechanism 3 may further include a second torque unit 34, the second torque unit 34 is sleeved outside the bearing 31, and the second torque unit 34 is located between the first torque unit 33 and the mounting portion 31a, specifically, the second torque unit 34 includes a first limiting member 341, a second limiting member 342 and a torque member 343, where the torque member 343 is disposed between the first limiting member 341 and the second limiting member 342, and the torque member 343 includes a plurality of elastic pieces; the first limiting member 341 and the second limiting member 342 rotate synchronously with the bearing 31, and the second torsion unit 34 generates torsion based on friction between the first limiting member 341 and the second limiting member 342 and the torsion member 343, and the first limiting member 341 and the second limiting member 342 press the torsion member 343.

In the present application, in order to further increase the torsion generated in the second torsion unit 34, a friction plate 344 may be further disposed between the torsion member 343 and the first limiting member 341, and/or between the torsion member 343 and the second limiting member 342, and fig. 4 and 5 show that a friction plate 344 is disposed between the first limiting member 341 and the torsion member 343.

In the present application, the first limiting member 341 and the second limiting member 342 may be directly and fixedly connected to the bearing 31, such as the first limiting member 341 shown in fig. 4 and 5, which is a limiting nut, and is fixedly connected to the bearing 31 through a threaded structure (the threaded structure is not specifically shown on the bearing 31 in fig. 5, but it should be understood by those skilled in the art that there would be a threaded structure matching with the limiting nut); the first limiting member 341 and the second limiting member 342 can also be movably connected to the bearing 31, for example, the second limiting member 342 shown in fig. 4 and 5 is sleeved outside the bearing 31, but is not fixed thereon, but can slide along the bearing 31 along with the change of the position relationship between the second protrusion portion 342a thereon and the second groove portion 35a on the third limiting member 35, and of course, the sliding needs to be premised on that the basic function of the second torsion unit 34 generating torsion is not affected.

In the present application, in order to increase the positioning point of the rotating shaft mechanism 3 in the rotating process, so as to make the corresponding keyboard or the foldable housing have better hovering performance, please refer to fig. 4, fig. 5 and fig. 7, the rotating shaft mechanism 3 may further include a third limiting member 35, the third limiting member 35 is sleeved outside the bearing 31 and is adjacent to the second limiting member 342, the third limiting member 35 is fixed in the bearing sleeve 32, and the bearing 31 may rotate in the third limiting member 35; a second groove portion 35a is disposed at an end of the third limiting member 35 close to the second limiting member 342, and a second protrusion portion 342a corresponding to the second groove portion 35a is disposed on the second limiting member 342; when the bearing 31 rotates toward the first direction and rotates to the first preset angle, the second protrusion 342a slides into the second groove 35a to limit the bearing 31 from continuing to rotate toward the first direction.

Specifically, the first preset angle may be the same as the third preset angle, that is, after the second protrusion portion 342a slides into the second groove portion 35a, the bearing 31 cannot continue to rotate at all toward the first direction (absolute restriction), and at this time, this absolute restriction can be achieved by providing the second groove portion 35a and the second projecting portion 342a, for example, by providing one side surface of the second groove portion 35a along which the second projecting portion 342a slides out of the second groove portion 35a when the bearing 31 is rotated in the first direction and providing a vertical surface (vertical with respect to the bottom surface of the second groove portion 35a) and a side surface corresponding to the second projecting portion 342a, other stopper structures may be provided, this absolute restriction is achieved by the first stopper 35b and the second stopper 31b described below (i.e., as shown in fig. 7, in which case the second recess portion 35a and both side surfaces of the second projecting portion 342a are sloped).

Specifically, the first preset angle may be different from the third preset angle, and then the first preset angle is smaller than the third preset angle, that is, after the second protrusion 342a slides into the second groove portion 35a, as long as a certain external force is applied to the bearing 31, the bearing 31 may further continue to rotate towards the first direction (relative limitation), and at this time, the second groove portion 35a and two side surfaces as well as two side surfaces of the second protrusion 342a are both slope surfaces.

In this application, in order to further limit the rotation of the rotating shaft mechanism 3, so that the keyboard or the foldable housing has a good hovering capability, please refer to fig. 5, a limiting block may be further disposed at an end of the third limiting member 35 away from the second limiting member 342, and a second limiting block 31b corresponding to the first limiting block 35b is fixed on the bearing 31; when the bearing 31 rotates to the second preset angle, the second stopper 31b abuts against the first stopper 35b to limit the rotation of the bearing 31. Specifically, the second preset angle may be one angle or two angles, and when two angles are desired, may be 0 degrees and the maximum angle (i.e., the third preset angle) at which the bearing 31 may rotate, respectively.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A spindle mechanism, comprising:

the bearing is arranged in a bearing sleeve, and one end of the bearing is a mounting part;

the first torsion unit is arranged in the bearing sleeve and sleeved at the other end, far away from the mounting part, of the bearing; the first torsion unit comprises a first mounting piece, a torsion spring and a second mounting piece, and the first mounting piece is fixed in the bearing sleeve; one end of the torsion spring is mounted on the first mounting piece, the other end of the torsion spring is mounted on the second mounting piece, the bearing can rotate in the first mounting piece, and the second mounting piece and the bearing rotate synchronously;

when the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing; when the bearing rotates towards the second direction, the torsion of the torsion spring is gradually increased along with the rotation of the bearing.

2. The spindle mechanism according to claim 1, wherein the first mounting member has a first protrusion, the bearing housing has a first groove corresponding to the first protrusion, and the first protrusion is engaged with the first groove to limit the rotation of the first mounting member.

3. The spindle mechanism according to claim 1 or 2, wherein the first torsion unit further includes a torsion spring sleeve, the torsion spring sleeve is sleeved outside the bearing, the torsion spring is sleeved outside the torsion spring sleeve, and the torsion spring sleeve is used for limiting radial deformation of the torsion spring.

4. The spindle mechanism according to claim 3, further comprising:

the second torsion unit is sleeved outside the bearing and is positioned between the first torsion unit and the mounting part;

the second torsion unit comprises a first limiting piece, a second limiting piece and a torsion piece arranged between the first limiting piece and the second limiting piece, and the torsion piece comprises a plurality of elastic pieces;

the first limiting part and the second limiting part rotate synchronously with the bearing, and the second torsion unit generates torsion based on friction between the first limiting part and the second limiting part and the torsion part and extrusion of the first limiting part and the second limiting part on the torsion part.

5. The spindle mechanism according to claim 4, further comprising:

the third limiting piece is sleeved outside the bearing and is close to the second limiting piece, the third limiting piece is fixed in the bearing sleeve, and the bearing can rotate in the third limiting piece; a second groove part is arranged at the end part of the third limiting part close to the second limiting part, and a second protruding part corresponding to the second groove part is arranged on the second limiting part;

when the bearing rotates towards a first direction and rotates to a first preset angle, the second protruding portion slides into the second groove portion to limit the bearing to rotate continuously towards the first direction.

6. The rotating shaft mechanism according to claim 5, wherein a first limiting block is disposed at an end of the third limiting block away from the second limiting block, and a second limiting block corresponding to the first limiting block is fixed on the bearing; when the bearing rotates to a second preset angle, the second limiting block is abutted to the first limiting block so as to limit the rotation of the bearing.

7. A folding chassis for supporting a mobile terminal, comprising:

a base, a supporting plate and a rotating shaft mechanism as claimed in any one of claims 1 to 6, wherein the base is connected with a first connecting piece fixed outside the bearing sleeve, and the supporting plate is connected with a second connecting piece fixed on the mounting part of the bearing.

8. The folding chassis of claim 7, wherein the support plate comprises:

one end of the first plate body is connected with the second connecting piece, and the other end of the first plate body is hinged with the second plate body through a damping rotating shaft; the first plate body can rotate towards the first direction based on the rotating shaft mechanism and has a maximum opening state of rotating to a third preset angle relative to the base, and the second plate body can rotate towards the first direction based on the damping rotating shaft and has a maximum opening state of rotating to a fourth preset angle relative to the first plate body;

when the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the first direction to be opened, the first plate body reaches a maximum opening state before the second plate body; when the bearing rotates towards the second direction, the torsion force of the torsion spring is gradually increased along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the second direction and are closed, the second plate body reaches a closed state before the first plate body.

9. A keyboard, comprising:

the keyboard body, the supporting plate and the rotating shaft mechanism as claimed in any one of claims 1 to 6, wherein the keyboard body is connected with a first connecting piece fixed outside the bearing sleeve, and the supporting plate is connected with a second connecting piece fixed on the mounting part of the bearing.

10. The keyboard of claim 9, wherein the support plate comprises:

one end of the first plate body is connected with the second connecting piece, and the other end of the first plate body is hinged with the second plate body through a damping rotating shaft; the first plate body can rotate towards the first direction based on the rotating shaft mechanism and has a maximum opening state of rotating to a third preset angle relative to the keyboard body, and the second plate body can rotate towards the first direction based on the damping rotating shaft and has a maximum opening state of rotating to a fourth preset angle relative to the first plate body;

when the bearing rotates towards the first direction, the torsion force of the torsion spring is gradually reduced along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the first direction to be opened, the first plate body reaches a maximum opening state before the second plate body; when the bearing rotates towards the second direction, the torsion force of the torsion spring is gradually increased along with the rotation of the bearing, and when the first plate body and the second plate body rotate towards the second direction and are closed, the second plate body reaches a closed state before the first plate body.

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