Patent Description:
Owing to development of a flexible organic light-emitting diode (OLED) display technology, mobile terminals have been developing towards foldable electronic devices for their portability like ordinary electronic devices and amazing experience of display from unfolded large-screens, for which keen competition has been heated up among major terminal manufacturers. In most cases of switching states of the foldable electronic devices by hinges, the electronic devices are folded or unfolded by folding or unfolding the hinges.

<CIT> discloses an electronic device, including a screen and a housing device for carrying the screen. The housing device can automatically form a screen accommodating space for relief during the folding process. The folding of the housing device is stable and applies small pressure onto the screen, thus reducing the risk of damage to the screen due to excessive compression of the housing device, such that the screen and the electronic device have a higher reliability and a longer service life.

The disclosure provides a rotary shaft apparatus and a foldable electronic device, so as to overcome defects in the related art.

A first aspect of the invention provides a rotary shaft apparatus as claimed in claim <NUM>.

Optionally, the first transmission assembly includes a main body and a fixing member detachably connected to the main body, the main body is rotatably connected to the base plate around the first axial direction, and the first supporting member is rotatably connected to at least one of the fixing member and the main body around the second axial direction.

Optionally, at least one of the main body and the fixing member has a first guide portion, and the first supporting member has a second guide portion in sliding fit with the first guide portion; or
a first guide portion is jointly formed between the main body and the fixing member, and the first supporting member has a second guide portion in sliding fit with the first guide portion.

Optionally, the first guide portion includes at least one of a sliding groove and a sliding member, and the second guide portion includes at least one of a sliding groove and a sliding member that adapt to the first guide portion.

Optionally, the main body has a first positioning portion, and the fixing member has a second positioning portion in positioning fit with the first positioning portion.

Optionally, the rotary shaft apparatus includes a rotary shaft cover, the base plate includes a first supporting plane, and the rotary shaft cover is on one side, away from the first supporting plane, of the base plate.

Optionally, the first transmission assembly has a first limiting structure, and at least one of the base plate and the rotary shaft cover has a second limiting structure in limiting fit with the first limiting structure.

Optionally, the first limiting structure includes at least one of a limiting groove and a limiting portion, and the second limiting structure includes at least one of a limiting groove and a limiting portion that adapt to the first limiting structure.

Optionally, the base plate has a first track shaft parallel to the first axial direction, and the first supporting member has a first track groove in sliding fit with the first track shaft; and/or
one of the first supporting member and the second transmission assembly has a second track shaft parallel to the third axial direction, and the other one of the first supporting member and the second transmission assembly has a second track structure in sliding fit with the second track shaft.

Optionally, at least two rotary shaft assemblies are arranged, and at least one rotary shaft assembly is arranged on each of two sides of the base plate in a direction perpendicular to the first axial direction.

Optionally, at least one of the first transmission assembly and the second transmission assembly of the rotary shaft assembly on one side of the base plate has a first meshing member, at least one of the first transmission assembly and the second transmission assembly of the rotary shaft assembly on the other side of the base plate has a second meshing member meshing with the first meshing member, and
the first meshing member on one side of the base plate is connected, in a meshing manner, to the second meshing member on the other side of the base plate, such that the rotary shaft assemblies positioned on the two sides of the base plate keep synchronously moving.

Optionally, the rotary shaft apparatus further includes at least one linkage transmission pair connected, in a meshing manner, between the first meshing member and the corresponding second meshing member that are on the two sides of the base plate.

Optionally, the rotary shaft apparatus further includes a damping mechanism abutting against at least one of the first transmission assembly and the second transmission assembly.

Optionally, the damping mechanism includes a clamping plate and a first elastic member, the clamping plate abuts against at least one of the first transmission assembly and the second transmission assembly in a second direction, one end of the first elastic member abuts against the clamping plate, and the other end of the first elastic member abuts against the base plate.

Optionally, at least one of the first transmission assembly and the second transmission assembly has a first connection hole penetrating in the second direction, the clamping plate has a second connection hole penetrating in the second direction, and the second connection hole corresponds to the first connection hole; and
the damping mechanism further includes a connection shaft, the connection shaft penetrates the first connection hole and the corresponding second connection hole, and the first elastic member sleeves the connection shaft.

Optionally, at least one of the first transmission assembly and the second transmission assembly has a first cam structure, the clamping plate has a second cam structure adapting to the first cam structure, and the second cam structure abuts against the first cam structure.

Optionally, the rotary shaft apparatus further includes a third transmission assembly connected to the second supporting member and used for driving the second supporting member to move relative to the base plate.

Optionally, the third transmission assembly includes a transmission member and a second elastic member connected to the transmission member; one side of the transmission member is connected to one side, close to the base plate, of the second supporting member, and the other side of the transmission member is movably connected to the base plate; and one end of the second elastic member is connected to the base plate, and the other end of the second elastic member is connected to the transmission member.

Optionally, the transmission member includes a transmission portion and a connection portion; one end of the connection portion is connected to one side, close to the base plate, of the second supporting member, and the other end of the connection portion is connected to the transmission portion;
the transmission portion is movably connected to the base plate; and one end of the second elastic member is connected to the base plate, and the other end of the second elastic member is connected to the transmission member.

Optionally, the transmission portion had a third guide portion, and one side, close to the second supporting member, of the base plate has a fourth guide portion in guide fit with the third guide portion; and
the second elastic member sleeves the fourth guide portion, one end of the second elastic member is connected to the fourth guide portion, and the other end of the second elastic member is connected to the transmission portion.

Optionally, the first transmission assembly has an abutting and pushing portion, and the abutting and pushing portion is used for driving, when the folded state is switched to the unfolded state, the second supporting member to move from the second position to the first position; and in the unfolded state, the abutting and pushing portion supports one side, close to the base plate, of the second supporting member.

A second aspect of the invention provides a foldable electronic device. The foldable electronic device includes a middle frame housing, a flexible display screen, and the rotary shaft apparatus described in the first aspect, the flexible display screen being connected to the middle frame housing, the first transmission assembly of a rotary shaft assembly being connected to the middle frame housing.

The technical solution provided in the example of the disclosure may include the following beneficial effects:.

it can be seen from the above examples that the first transmission assembly in the disclosure drives, when rotating relative to the base plate, the first supporting member to rotate, and the second transmission assembly is driven to rotate relative to the base plate by the first supporting member such that the rotary shaft assembly may integrally rotate relative to the base plate without an additional transmission structure, a response speed is higher, and material cost is saved.

It should be understood that the above general description and the following detailed description are illustrative and explanatory, and may not limit the disclosure.

The accompanying drawings herein, which are incorporated in the description as a constituent part of the description, illustrate the examples satisfying the disclosure and are used to explain the principles of the disclosure together with the description.

The examples will be described in detail herein and shown in the accompanying drawings. When the following descriptions relate to the accompanying drawings, unless otherwise specified, the same numeral in different accompanying drawings denotes the same or similar element. The implementations described in the following examples do not denote all implementations consistent with the disclosure. On the contrary, the implementations are merely examples of apparatuses and methods consistent with some aspects of the disclosure as detailed herein.

The terms used in the disclosure are merely to describe the specific examples, instead of limiting the disclosure. The singular forms such as "a", "the" and "this" used in the disclosure are also intended to include the plural forms, unless otherwise clearly stated in the context. It should also be understood that the term "and/or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first", "second", "third", etc. may be employed in the disclosure to describe various information, such information should not be limited to these terms. These terms are merely used to distinguish the same type of information from each other. For example, first information could also be referred to as second information, and similarly, second information could also be referred to as first information, without departing from the scope of the disclosure. Depending on the context, the word "if" as used herein may be interpreted as "in the case of", "under the situation that" or "in response to determining".

A rotary shaft apparatus and a foldable electronic device in examples of the disclosure will be described in detail in combination with the accompanying drawings. The features in the following examples and implementations may be combined with each other without conflict.

As shown in <FIG>, an example of the disclosure provides a foldable electronic device <NUM>. The foldable electronic device <NUM> may be a foldable mobile phone, a tablet computer, a notebook computer, a camera or other foldable terminal devices. The foldable electronic device <NUM> may include a middle frame housing <NUM>, a flexible display screen <NUM> and a rotary shaft apparatus <NUM>. The flexible display screen <NUM> is connected to the middle frame housing <NUM>, the rotary shaft apparatus <NUM> is mounted in a middle of the middle frame housing <NUM>, and the middle frame housing <NUM> may rotate by means of the rotary shaft apparatus <NUM>, so as to switch the foldable electronic device <NUM> between a folded state shown in <FIG> and an unfolded state shown in <FIG>. Specifically, the middle frame housing <NUM> may include a first housing and a second housing, the flexible display screen <NUM> is laid on the first housing and the second housing, and the rotary shaft apparatus <NUM> is mounted between the first housing and the second housing. Any one of the first housing and the second housing may rotate relative to the other one by means of the rotary shaft apparatus <NUM>, so as to drive the flexible display screen <NUM> to be synchronously folded or unfolded.

As shown in <FIG>, the rotary shaft apparatus <NUM> may include a base plate <NUM> and a rotary shaft assembly <NUM>. The rotary shaft assembly <NUM> includes a first transmission assembly <NUM>, and the first transmission assembly <NUM> is connected to the middle frame housing <NUM>, so as to assemble the rotary shaft apparatus <NUM> to the middle frame housing <NUM>. In some examples, the first transmission assembly <NUM> is provided with a mounting portion <NUM>, so as to be connected to the middle frame housing <NUM> by means of the mounting portion <NUM>. The middle frame housing <NUM> may be correspondingly provided with a connection portion, and through assembly and connection between the connection portion and the mounting portion <NUM>, the first transmission assembly <NUM> may be mounted on the middle frame housing <NUM>. In the example, the mounting portion <NUM> includes at least one mounting hole, and the connection portion includes at least one connection hole. For example, the mounting hole and the connection hole each may be at least one of a threaded hole, a rivet hole and an unthreaded hole, the middle frame housing <NUM> may be provided with a connection hole corresponding to the mounting hole in position, and a fastener such as a screw is inserted into the mounting hole and the connection hole of the middle frame housing <NUM>, so as to mount the first transmission assembly <NUM> mounted on the middle frame housing <NUM>, and assemble the rotary shaft apparatus <NUM> to the middle frame housing <NUM>.

It can be understood that one end of the first transmission assembly <NUM> is rotatably connected to the base plate <NUM>, and the other end of the first transmission assembly <NUM> is connected to the middle frame housing <NUM> by means of the mounting portion <NUM>. No additional parts are needed, and a force may be directly transmitted between two components, such that a response speed is higher. When a user rotates any one of the first housing and the second housing, the other one of the first housing and the second housing may be driven to synchronously rotate by means of the rotary shaft apparatus <NUM> at a higher response speed, so as to realize synchronous folding or unfolding from two sides, driving the flexible display screen <NUM> to be synchronously bent or unfolded.

Further, the rotary shaft assembly <NUM> further includes a first supporting member <NUM> and a second transmission assembly <NUM>. The first transmission assembly <NUM> is rotatably connected to the base plate <NUM> around a first axial direction (an X direction shown in the figure). The first supporting member <NUM> is rotatably connected to the first transmission assembly <NUM> around a second axial direction parallel to the first axial direction, and is movably connected to the second transmission assembly <NUM>. The second transmission assembly <NUM> is rotatably connected to the base plate <NUM> around a third axial direction parallel to the first axial direction. It can be understood that the first axial direction, the second axial direction and the third axial direction may be coaxially set or non-coaxially set.

The first transmission assembly <NUM> drives, when rotating relative to the base plate <NUM>, the first supporting member <NUM> to rotate relative to the base plate <NUM>, and the first supporting member <NUM> drives the second transmission assembly <NUM> to rotate relative to the base plate <NUM>. In this way, the second transmission assembly <NUM> is driven to rotate relative to the base plate <NUM> by the first supporting member <NUM> such that the rotary shaft assembly <NUM> may integrally rotate relative to the base plate <NUM> without an additional transmission structure, saving material cost. The rotary shaft apparatus <NUM> may be made thinner, such that a design requirement of a miniaturized product is met, and a response speed is higher.

In some examples, the rotary shaft assembly <NUM> may include at least two first transmission assemblies <NUM> arranged in a length direction of the base plate <NUM> at intervals, and the first supporting member <NUM> is connected to the at least two first transmission assemblies <NUM>. In this way, the first supporting member <NUM> may be driven to rotate by at least two first transmission assemblies <NUM> such that a response speed may be higher, and stability of the first supporting member <NUM> during rotation may be improved. In the example, the rotary shaft assembly <NUM> including two first transmission assemblies <NUM> that are arranged on two sides of the first supporting member <NUM> is taken as an example. It should be noted that the number of the first transmission assemblies <NUM> may be adjusted according to actual situations, such as a length of the base plate, a length of the first supporting member, an assembly space and a placement position, which is not limited in the disclosure.

In some examples, the base plate <NUM> includes a first supporting plane <NUM> (an upper surface shown in <FIG>), and the first supporting member <NUM> includes a second supporting plane <NUM> (an upper surface shown in <FIG>). The rotary shaft apparatus <NUM> has an unfolded state and a folded state. As shown in <FIG> and <FIG>, when the rotary shaft apparatus <NUM> is in the unfolded state, the second supporting plane <NUM> of the first supporting member <NUM> and the first supporting plane <NUM> of the base plate <NUM> are positioned on the same plane, and may be used for supporting the flexible display screen <NUM> of the foldable electronic device <NUM>. As shown in <FIG> and <FIG>, a first preset included angle may be formed between the second supporting plane <NUM> of the first supporting member <NUM> and the first supporting plane <NUM> of the base plate <NUM>, and the first supporting member <NUM> and the base plate <NUM> define a screen-accommodating space. In some examples, the first preset included angle may range from <NUM> degrees to <NUM> degrees, and may be adjusted according to actual situations, which is not limited in the disclosure. In an illustrated example, a first preset included angle being <NUM> degrees is taken as an example. In this way, as shown in <FIG>, when the rotary shaft apparatus <NUM> is in the folded state, the base plate <NUM> and the first supporting member <NUM> may define a screen-accommodating space in a "drop-like shape", the screen-accommodating space is large and is used for accommodating the flexible display screen <NUM> of the foldable electronic device <NUM>, such that the flexible display screen <NUM> may be basically set in a "drop shape" when the foldable electronic device <NUM> is folded. Compared with a <NUM>-degree folding method in the related art, this method has the effects that a bending angle of the flexible display screen <NUM> during folding may be reduced, such that creases after the flexible display screen <NUM> is unfolded is reduced, the flexible display screen is not prone to be broken, and service life is prolonged.

In some examples, the first transmission assembly <NUM> includes a first supporting surface <NUM> and a second supporting surface <NUM>, and a second preset included angle is formed between the second supporting surface <NUM> and the first supporting surface <NUM>. In some examples, the second preset included angle may be set corresponding to the first preset included angle, may range from <NUM> degrees to <NUM> degrees, and may be adjusted according to actual situations, which is not limited in the disclosure.

In the unfolded state, the first supporting surface <NUM> and the first supporting plane <NUM> of the base plate <NUM> are positioned on the same plane, and may be used for supporting the flexible display screen. In the folded state, the second supporting surface <NUM> abuts against the the first supporting member <NUM>. In this way, in the folded state, the second supporting surface <NUM> of the first transmission assembly <NUM> may support the first supporting member <NUM>, and the first supporting surface <NUM> may also support the flexible display screen to a certain extent, so as to improve stability of the entire machine in the folded state.

As shown in <FIG>, in some examples, the first transmission assembly <NUM> may include a first structure portion <NUM> and a second structure portion <NUM> connected to the first structure portion <NUM>, and the second structure portion <NUM> is closer to the base plate <NUM> than the first structure portion <NUM>. One side, close to the first supporting member <NUM>, of the first structure portion <NUM> is provided with the first supporting surface <NUM>, and one side, close to the first supporting member <NUM>, of the second structure portion <NUM> is provided with the second supporting surface <NUM>. The second structure portion <NUM> includes a first end (an upper end shown in <FIG>) close to one side of the first structure portion <NUM>, and a second end (a lower end shown in <FIG>) away from the first structure portion <NUM>. In a direction from the first end to the second end, a thickness of the second structure portion <NUM> in a direction (a dotted line direction shown in <FIG>) perpendicular to the first supporting surface <NUM> gradually decreases, such that a second preset included angle is formed between the second supporting surface <NUM> and the first supporting surface <NUM>.

In some examples, at least two rotary shaft assemblies <NUM> are arranged, and at least one rotary shaft assembly <NUM> is arranged on each of two opposite sides of the base plate <NUM> in a first direction (a Y direction shown in the figure). In the example, the first direction may be perpendicular to the first axial direction. In other examples, the first direction may be other directions, which is not limited in the disclosure. In an illustrated example, the situation that two rotary shaft assemblies <NUM> are arranged, and one rotary shaft assembly <NUM> is arranged on each of two sides of the base plate <NUM> is taken as an example. Certainly, it should be noted that the number of the rotary shaft assemblies <NUM> and the number of the rotary shaft assembly <NUM> arranged on the same side of the base plate <NUM> may be adjusted according to actual situations, such as a length, an assembly space and a placement position of the foldable electronic device, which is not limited in the disclosure.

In some examples, at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> of the rotary shaft assembly <NUM> positioned on one side of the base plate <NUM> is provided with a first meshing member <NUM>, and at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> of the rotary shaft assembly <NUM> positioned on another side of the base plate <NUM> is provided with a second meshing member <NUM> meshing with the first meshing member <NUM>. The first meshing member <NUM> positioned on one side of the base plate <NUM> is connected, in a meshing manner, to the second meshing member <NUM> positioned on the other side of the base plate <NUM>, such that the rotary shaft assemblies <NUM> positioned on the two sides of the base plate <NUM> keep synchronously moving. In some examples, the first meshing member <NUM> and the second meshing member <NUM> may be gears adapting to each other, or may be other meshing members adapting to each other, which is not limited in the disclosure. It can be understood that, in the rotary shaft assembly <NUM> positioned on one side of the base plate <NUM>, the first transmission assembly <NUM> may be provided with the first meshing member <NUM>, the second transmission assembly <NUM> may be provided with the first meshing member <NUM>, or both the first transmission assembly <NUM> and the second transmission assembly <NUM> may be provided with the first meshing members <NUM>. In the rotary shaft assembly <NUM> positioned on the other side of the base plate <NUM>, the first transmission assembly <NUM> may be provided with the second meshing member <NUM>, the second transmission assembly <NUM> may be provided with the second meshing member <NUM>, or both the first transmission assembly <NUM> and the second transmission assembly <NUM> may be provided with the second meshing members <NUM>. Positions of the first meshing member <NUM> and the second meshing member <NUM> may be adjusted according to actual requirements, which is not limited in the disclosure.

In this way, the rotary shaft assembly <NUM> positioned on one side of the base plate <NUM> may be connected to one of the first housing and the second housing of the middle frame housing <NUM>, and the rotary shaft assembly <NUM> positioned at the other side of the base plate <NUM> may be connected to the other one of the first housing and the second housing. When a user rotates any one of the first housing and the second housing, through meshing between the first meshing member <NUM> and the second meshing member <NUM> on the two sides of the base plate <NUM>, the other one of the first housing and the second housing may be driven to synchronously rotate, so as to realize synchronous folding or unfolding from two sides, driving the flexible display screen <NUM> to be synchronously bent or unfolded.

As shown in <FIG> and <FIG>, in an illustrated example, the second transmission assembly <NUM> of the rotary shaft assembly <NUM> positioned on one side of the base plate <NUM> is provided with a first meshing member <NUM>, and the second transmission assembly <NUM> of the rotary shaft assembly <NUM> positioned on the other side of the base plate <NUM> is provided with a second meshing member <NUM>. In an illustrated example, the first meshing member <NUM> and the second transmission assembly <NUM> are integrally arranged. It should be noted that, the first meshing member <NUM>, the second meshing member <NUM>, and the first transmission assembly <NUM> and the second transmission assembly <NUM> of the rotary shaft assembly <NUM> may be integrally arranged, or may be detachably connected to each other in an assembly manner, which may be determined according to actual requirements and is not limited in the disclosure.

In some examples, the rotary shaft apparatus <NUM> may further include at least one linkage transmission pair <NUM> connected, in a meshing manner, between the first meshing member <NUM> and the corresponding second meshing member <NUM> that are positioned on the two sides of the base plate <NUM>. By arranging the linkage transmission pair <NUM> between the first meshing member <NUM> and the second meshing member <NUM>, stability of synchronous rotation may be improved. When a user rotates any one of the first housing and the second housing, through meshing between the first meshing member <NUM> and the second meshing member <NUM> on the two sides of the base plate <NUM> and the linkage transmission pair <NUM>, the other one of the first housing and the second housing may be driven to synchronously rotate, so as to realize synchronous folding or unfolding from two sides, driving the flexible display screen <NUM> to be synchronously bent or unfolded. It can be understood that one or more linkage transmission pairs <NUM> may be arranged, which may be determined according to actual requirements and is not limited in the disclosure. In an illustrated example, the situation that one linkage transmission pair <NUM> is arranged is taken as an example.

In some examples, the first meshing member <NUM> and the second meshing member <NUM> may be gears adapting to each other, and the linkage transmission pair <NUM> may be a linkage gear pair, and may include two or more synchronous gears <NUM> that mesh with each other. The first meshing member <NUM> meshes with one of the synchronous gears <NUM>, the second meshing member <NUM> meshes with another synchronous gear <NUM>, and the first meshing member <NUM>, the second meshing member <NUM> and the synchronous gears <NUM> match each other to realize synchronous transmission. It should be noted that the first meshing member <NUM>, the second meshing member <NUM> and the linkage transmission pair <NUM> may be other meshing members that match each other, and the number of the linkage transmission pair <NUM> may be set according to actual requirements, which is not limited in the disclosure.

In this way, the first transmission assembly <NUM> of the rotary shaft assembly <NUM> positioned on one side of the base plate rotates relative to the base plate <NUM>, so as to drive the first supporting member <NUM> of the same rotary shaft assembly to rotate. The second transmission assembly <NUM> of the same rotary shaft assembly is driven to rotate relative to the base plate <NUM> by the first supporting member <NUM>, and then through meshing between the first meshing member <NUM>, the linkage transmission pair <NUM> and the second meshing member <NUM>, the second transmission assembly <NUM> of the rotary shaft assembly <NUM> on the other side of the base plate <NUM> is driven to synchronously rotate relative to the base plate <NUM>. Then, the first supporting member <NUM> of the rotary shaft assembly <NUM> on the other side is driven to synchronously rotate by the second transmission assembly <NUM>, and the first transmission assembly <NUM> of the rotary shaft assembly <NUM> on the other side is driven to rotate relative to the base plate <NUM> by the first supporting member <NUM>, so as to drive the rotary shaft assembly <NUM> on the other side to synchronously rotate. Thus, when a user rotates any one of the first housing and the second housing, the other one of the first housing and the second housing may be driven to synchronously rotate by means of the rotary shaft apparatus <NUM>, so as to realize synchronous folding or unfolding from two sides, driving the flexible display screen <NUM> to be synchronously bent or unfolded. It should be noted that the linkage transmission pair <NUM> may be connected between the first transmission assemblies <NUM> of the two rotary shaft assemblies <NUM>, the first meshing member <NUM> is connected to the first transmission assembly <NUM> of one rotary shaft assembly <NUM>, and the second meshing member <NUM> is connected to the first transmission assembly <NUM> of the rotary shaft assembly <NUM> on the other side, which is not limited in the disclosure.

As shown in <FIG>, in some examples, the rotary shaft apparatus <NUM> may further include a damping mechanism <NUM> abutting against at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> of the rotary shaft assembly <NUM>. In this way, the damping mechanism <NUM> may provide a certain frictional damping for the rotary shaft assembly <NUM>, and the rotary shaft assemblies <NUM> on the two sides of the base plate <NUM> may have a better hovering effect when rotating synchronously, so as to improve hand feeling experience of a user rotating the foldable electronic device <NUM>. It should be noted that when the linkage transmission pair <NUM> is provided, the damping mechanism <NUM> may abut against the first meshing member <NUM>, the second meshing member <NUM> and the linkage transmission pair <NUM>. In some examples, the base plate <NUM> may be provided with an assembly space, such as a recess, for accommodating and assembling the damping mechanism <NUM>, which is not limited in the disclosure.

In some examples, the damping mechanism <NUM> includes a clamping plate <NUM> and a first elastic member <NUM>, and the clamping plate <NUM> abuts against at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> in a second direction. One end of the first elastic member <NUM> abuts against the clamping plate <NUM>, and the other end of the first elastic member abuts against the base plate <NUM>. In this way, an elastic force is provided for the clamping plate <NUM> by the first elastic member <NUM>, and the clamping plate <NUM> abuts against at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> to provide frictional damping for same. In an illustrated example, the second direction is parallel to the first axial direction, which is an X direction shown in the figure. In other examples, the second direction may be other directions, which is not limited in the disclosure.

It should be noted that, under the situation that the linkage transmission pair <NUM> is arranged, the clamping plate <NUM> may abut against the first meshing member <NUM>, the second meshing member <NUM> and the linkage transmission pair <NUM>. In some examples, the damping mechanism <NUM> may further include a fixed plate <NUM> fixedly connected to the base plate <NUM> by means of a screw, a bolt or other fastening manners. One end of the first elastic member <NUM> abuts against the clamping plate <NUM>, and the other end of the first elastic member abuts against the fixed plate <NUM>, so as to improve stability of the first elastic member <NUM>. In some examples, the clamping plate <NUM>, the first elastic member <NUM> and the fixed plate <NUM> may be arranged in the recess, and the fixed plate <NUM> may be fixedly connected to an inner wall of the recess by means of a screw, a bolt or other fastening manners.

In an illustrated example, the first elastic member <NUM> may be a spring. Two clamping plates <NUM> may be arranged and abut against two sides of at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> of the rotary shaft assembly <NUM> in the second direction respectively, so as to generate frictional damping on two sides of the rotary shaft assembly <NUM>, achieving a better hovering effect when the rotary shaft assembly <NUM> rotates, and further improving hand feeling experience of a user rotating the foldable electronic device <NUM>. It should be noted that the first elastic member <NUM> may be other elastic structures, and the other number of the clamping plates <NUM> may be arranged as required, which is not limited in the disclosure.

In some examples, at least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> of the rotary shaft assembly <NUM> is provided with a first connection hole penetrating in the second direction, the clamping plate <NUM> is provided with a second connection hole penetrating in the second direction, and the second connection hole corresponds to the first connection hole. At least one of the first transmission assembly <NUM> and the second transmission assembly <NUM> is provided with a first cam structure <NUM>, the clamping plate <NUM> is provided with a second cam structure <NUM> adapting to the first cam structure <NUM>, and the second cam structure <NUM> abuts against the first cam structure <NUM>. It can be understood that the clamping plate <NUM> may be a cam plate or other plate provided with a cam structure. The damping mechanism <NUM> may further include a connection shaft <NUM> in the second direction, the connection shaft <NUM> penetrates the first connection hole and the second connection hole, and the first elastic member <NUM> sleeves the connection shaft <NUM>. In this way, through cam matching between the first cam structure <NUM> and the second cam structure <NUM>, when the rotary shaft assemblies <NUM> on the two sides synchronously rotate, the first elastic member <NUM> may be pressed to generate greater frictional damping, so as to achieve a better hovering effect, and further improve hand feeling experience of a user rotating the foldable electronic device <NUM>. In an illustrated example, both the first meshing member <NUM> and the second meshing member <NUM> are arranged on the second transmission assembly <NUM>. The first connection hole may be provided in the first meshing member <NUM> and the second meshing member <NUM>. In this way, the connection shaft <NUM> penetrates the corresponding first connection hole and second connection hole to connect the second transmission assembly <NUM> and the clamping plate <NUM> into a whole, and the second transmission assembly <NUM> may rotate relative to the base plate <NUM> by taking the connection shaft <NUM> as an axis. It should be noted that, under the situation that the linkage transmission pair <NUM> is arranged, the synchronous gears <NUM> of the linkage transmission pair <NUM> and the clamping plate <NUM> may further be provided with connection holes at corresponding positions, and the connection shaft <NUM> penetrates the corresponding connection holes to connect the clamping plate <NUM> and the linkage transmission pair <NUM> into a whole.

As shown in <FIG> and <FIG>, in some examples, one of the first supporting member <NUM> and the second transmission assembly <NUM> is provided with a second track shaft <NUM> parallel to the third axial direction, and the other one of the first supporting member <NUM> and the second transmission assembly <NUM> is provided with a second track structure <NUM> in sliding fit with the second track shaft <NUM>. The second track structure <NUM> may be provided with a sliding groove structure matching the second track shaft <NUM>, such as a second cambered track groove <NUM> shown in the figure. When the first transmission assembly <NUM> rotates relative to the base plate <NUM>, the second track shaft <NUM> slides along the second cambered track groove <NUM> relative to the second track structure <NUM>, and portions, in contact with each other, of the second track structure <NUM> and the second track shaft <NUM> drive the second track shaft <NUM> to rotate, so as to drive the second transmission assembly <NUM> to rotate relative to the base plate <NUM>. In an illustrated example, the second track structure <NUM> may include the second cambered track groove <NUM>. In other examples, the second track structure <NUM> may include a sliding groove structure in other shapes, which is not limited in the disclosure. In other examples, the second transmission assembly <NUM> may be movably connected to the first transmission assembly <NUM>. The transmission assembly <NUM> drives, when rotating relative to the base plate <NUM>, the first supporting member <NUM> to rotate, and the first transmission assembly <NUM> drives the second transmission assembly <NUM> to rotate relative to the base plate <NUM>, which is not limited in the disclosure.

Further, as shown in <FIG> and <FIG>, one end, away from the base plate <NUM>, of the second transmission assembly <NUM> may be provided with a shaft hole <NUM>, and the second track shaft <NUM> is arranged in the shaft hole <NUM>. In an example shown in <FIG>, one end, away from the base plate <NUM>, of the second transmission assembly <NUM> may be provided with a shaft groove <NUM>, and the second track shaft <NUM> is arranged in the shaft groove <NUM>. In some examples, both two sides of the second track structure <NUM> in a length direction of the first supporting member <NUM> may be provided with second cambered track grooves <NUM>. Both two sides of the shaft groove <NUM> in a length direction of the base plate <NUM> may be provided with second track shafts <NUM> that match the second cambered track grooves <NUM> in a one-to-one correspondence manner, so as to improve stability of the first supporting member <NUM> during movement.

It can be understood that the first transmission assembly <NUM> rotates relative to the base plate around the first axial direction, and the second transmission assembly <NUM> rotates relative to the base plate <NUM> around the third axial direction, that is, the first transmission assembly and the second transmission assembly rotate relative to the base plate <NUM> around two different axial directions respectively. Through matching between the second track shaft <NUM> and the second cambered track groove <NUM>, the first transmission assembly <NUM> rotates relative to the base plate <NUM> around the first axial direction to drive the first supporting member <NUM> to rotate. As the second track shaft <NUM> slides along the second cambered track groove <NUM> relative to the second track structure <NUM>, contact positions of the first supporting member <NUM> and the second track shaft <NUM> may be adjusted in real time, such that no matter where the first supporting member <NUM> rotates to, the second transmission assembly <NUM> may be driven to rotate relative to the base plate <NUM> around a third axial direction different from the first axial direction.

As shown in <FIG> and <FIG>, in some examples, the rotary shaft apparatus <NUM> may further include a second supporting member <NUM> capable of being movably arranged on the base plate <NUM> in a third direction (a Z direction shown in the figure), and may also be interactively connected to that base plate <NUM> in other directions, which is not limited in the disclosure. The base plate <NUM> includes a first supporting plane <NUM>, the first supporting member <NUM> includes a second supporting plane <NUM>, and the second supporting member <NUM> includes a third supporting plane <NUM> (an upper surface shown in <FIG>).

As shown in <FIG>, <FIG> and <FIG>, when the rotary shaft apparatus <NUM> is in an unfolded state, the second supporting member <NUM> is positioned at a first position, the third supporting plane <NUM> and the second supporting plane <NUM> of the first supporting member <NUM> are positioned on the same plane, and the first supporting member <NUM> and the second supporting member <NUM> may be used for supporting the flexible display screen <NUM>.

As shown in <FIG> and <FIG>, when the rotary shaft apparatus <NUM> is in a folded state, a first preset included angle is formed between the first supporting member <NUM> and the first supporting plane <NUM> of the base plate <NUM>. The third plane of the second supporting member <NUM> is positioned at a second position, the second position is closer to the base plate <NUM> than the first position, and the first supporting member <NUM> and the second supporting member <NUM> define a screen-accommodating space. In some examples, the first preset included angle may range from <NUM> degrees to <NUM> degrees, and may be adjusted according to actual situations, which is not limited in the disclosure. In this way, when the rotary shaft apparatus <NUM> is switched from the unfolded state to the folded state, the second supporting member <NUM> may move from the first position to the second position closer to the base plate <NUM> in the third direction, so as to make more space for the "drop-shaped" screen-accommodating space and further enlarge the screen-accommodating space.

As shown in <FIG>, in some examples, the rotary shaft apparatus <NUM> may further include a third transmission assembly <NUM> arranged on the base plate <NUM>, connected to the second supporting member <NUM>, and used for driving the second supporting member <NUM> to move in the third direction. In some examples, two or more third transmission assemblies <NUM> may be arranged in a length direction (an X direction shown in the figure) of the second supporting member <NUM> at intervals, so as to improve stability of the second supporting member <NUM> during movement.

The third transmission assembly <NUM> may include a transmission member <NUM> and a second elastic member <NUM> connected to the transmission member <NUM>. One side of the transmission member <NUM> is connected to one side, close to the base plate <NUM>, of the second supporting member <NUM>, and the other side of the transmission member is movably connected to the base plate <NUM>. One end of the second elastic member <NUM> is connected to the base plate <NUM>, and the other end of the second elastic member is connected to the transmission member <NUM>. In some examples, the second elastic member <NUM> may be a spring. In this way, the second supporting member <NUM> is driven to move in the third direction by an elastic force provided by the second elastic member <NUM>.

As shown in <FIG>, in some examples, an end portion or other position of the first transmission assembly <NUM> may be provided with an abutting and pushing portion <NUM>, and the abutting and pushing portion <NUM> may be positioned between the base plate <NUM> and the second supporting member <NUM>. When the rotary shaft apparatus <NUM> is switched from the folded state to the unfolded state, the abutting and pushing portion <NUM> is used for driving the second supporting member <NUM> to move from the second position to the first position. In the unfolded state, the abutting and pushing portion <NUM> supports one side, close to the base plate <NUM>, of the second supporting member <NUM>, so as to improve stability of the second supporting member <NUM> in the unfolded state.

It can be understood that, when the first transmission assembly <NUM> rotates from the folded state shown in <FIG> to the unfolded state shown in <FIG>, the second supporting member <NUM> is driven to rise from the second position shown in <FIG> to the first position shown in <FIG> in the third direction by the abutting and pushing portion <NUM>. In the unfolded state shown in <FIG>, the abutting and pushing portion <NUM> supports the side, close to the base plate <NUM>, of the second supporting member <NUM>.

When the first transmission assembly <NUM> rotates from the unfolded state shown in <FIG> to the folded state shown in <FIG>, under the action of weight of the second supporting member and elasticity of the second elastic member <NUM>, the second supporting member <NUM> gradually descends from the first position shown in <FIG> to the second position shown in <FIG> in the third direction.

In some examples, a side portion of the abutting and pushing portion <NUM> is provided with a cambered surface <NUM>, and an end portion of the abutting and pushing portion <NUM> is provided with an abutting and pushing surface <NUM> connected to the cambered surface. When the rotary shaft apparatus <NUM> is in the folded state, a side portion of the second supporting member <NUM> abuts against the cambered surface <NUM>. When the rotary shaft apparatus <NUM> is switched from the folded state to the unfolded state, the abutting and pushing surface <NUM> drives the second supporting member <NUM> to move from the second position to the first position. When the rotary shaft apparatus <NUM> is in the unfolded state, the abutting and pushing surface <NUM> supports the side, close to the base plate <NUM>, of the second supporting member <NUM>, so as to improve stability of the second supporting member <NUM> in the unfolded state.

As shown in <FIG>, in some examples, the transmission member <NUM> includes a transmission portion <NUM> and a connection portion <NUM>. One end of the connection portion <NUM> is connected to one side (a bottom side shown in the figures), close to the base plate <NUM>, of the second supporting member <NUM>, and the other end of the connection portion is connected to the transmission portion <NUM>. The transmission portion <NUM> is movably connected to the base plate <NUM> in the third direction. One end of the second elastic member <NUM> is connected to the base plate <NUM>, and the other end of the second elastic member is connected to the transmission member <NUM>. In some examples, the second supporting member <NUM> may be provided with a first screw hole <NUM>, and the connection portion <NUM> may be provided with a corresponding second screw hole <NUM>. A fastener <NUM> such as a screw penetrates the first screw hole <NUM> to be fixed to the second screw hole <NUM>, so as to fixedly connect the connection portion <NUM> to the second supporting member <NUM>. In this way, when the second supporting member <NUM> moves relative to the base plate <NUM> in the third direction, the connection portion <NUM> and the transmission portion <NUM> are driven to synchronously move, so as to press or stretch the second elastic member <NUM> such that the second elastic member <NUM> may provide a certain elastic force for the second supporting member <NUM>.

Further, the transmission portion <NUM> is provided with a third guide portion <NUM>, and one side, close to the second supporting member <NUM>, of the base plate <NUM> is provided with a fourth guide portion <NUM> in guide fit with the third guide portion <NUM>. In an illustrated example, the third guide portion <NUM> may include a guide hole provided in the third direction, the fourth guide portion <NUM> may include a guide column, and the guide column penetrates the third guide portion <NUM>. In other examples, the third guide portion <NUM> and the fourth guide portion may be in other structural forms, as long as a guide function may be realized, which is not limited in the disclosure.

The second elastic member <NUM> sleeves the fourth guide portion <NUM>. One end of the second elastic member <NUM> is connected to the fourth guide portion <NUM>, and the other end of the second elastic member is connected to the transmission portion <NUM>. In an illustrated example, one end of the second elastic member <NUM> is connected to one end, close to the second supporting member <NUM>, of the fourth guide portion <NUM>, and the other end of the second elastic member is connected to one side, close to the second supporting member <NUM>, of the transmission portion <NUM>. In other examples, a connection position of the second elastic member <NUM> may be set according to situations, which is not limited in the disclosure. In some examples, as shown in <FIG>, the base plate <NUM> may be provided with a structural groove <NUM> adapting to the structure of the transmission member <NUM>, and the fourth guide portion <NUM> may be a guide column arranged in the structural groove <NUM>. The transmission member <NUM> is arranged in the structural groove <NUM>, the transmission portion <NUM> is positioned below the second elastic member <NUM>, an upper end of the second elastic member <NUM> is connected to the fourth guide portion <NUM>, and a lower end of the second elastic member is connected to the transmission portion <NUM>.

In this way, the first transmission assembly <NUM> drives, when rotating from the folded state shown in <FIG> to the unfolded state shown in <FIG>, the second supporting member <NUM> to move from the second position shown in <FIG> to the first position shown in <FIG>, the second supporting member <NUM> drives, when moving, the connection portion <NUM> and the transmission portion <NUM> to synchronously move, the transmission portion <NUM> presses the second elastic member <NUM> such that the second elastic member <NUM> is in a compressed state, and the second elastic member <NUM> exerts a downward elastic force on the transmission portion <NUM>.

When the first transmission assembly <NUM> rotates from the unfolded state shown in <FIG> to the folded state shown in <FIG>, under the action of weight of the second supporting member <NUM> and elasticity of the second elastic member <NUM> on the transmission portion <NUM>, the second supporting member gradually descends from the first position shown in <FIG> to the second position shown in <FIG>.

As shown in <FIG>, <FIG>, <FIG> and <FIG>, in some examples, the first transmission assembly <NUM> includes a main body <NUM> and a fixing member <NUM> detachably connected to the main body <NUM>, the main body <NUM> is rotatably connected to the base plate <NUM> around the first axial direction, and the first supporting member <NUM> is rotatably connected to at least one of the main body <NUM> and the fixing member <NUM> around the second axial direction. In this way, the first transmission assembly <NUM> is set as two detachable parts which may be assembled to each other. After the first supporting member <NUM> is assembled to one of the main body <NUM> and the fixing member <NUM>, the main body <NUM> is assembled to the fixing member <NUM>, such that the first supporting member <NUM> is assembled to the first transmission assembly <NUM>, which is conducive to assembly and disassembly of the first supporting member <NUM> and the first transmission assembly <NUM>. In the example, the situation that the first supporting member <NUM> is assembled to the fixing member <NUM> first and then the first supporting member, the fixing member is assembled to the main body <NUM> is taken as an example for illustration. When the first supporting member <NUM> is assembled to the first transmission assembly <NUM>, the first transmission assembly <NUM> may be rotated to the main body <NUM> to be unfolded, then the first supporting member <NUM> is unfolded to be aligned with the main body <NUM>, and the fixing member <NUM> is to the main body <NUM> such that the first supporting member <NUM> may be conveniently assembled to the first transmission assembly <NUM>. Thus, additional assembly parts may be omitted, the number of components may be reduced, clearances may be reduced, assembly precision may be improved, and synchronization may be improved.

It should be noted that, as shown in <FIG> and <FIG>, in some examples, the main body <NUM> may include the first structure portion <NUM> and the second structure portion <NUM>. The fixing member <NUM> may include a first fixing sub-member <NUM> and a second fixing sub-member <NUM> connected to the first fixing sub-member <NUM>, and the second fixing sub-member <NUM> is closer to the base plate <NUM> than the first fixing sub-member <NUM>. One side, close to the first supporting member <NUM>, of the first fixing sub-member <NUM> is provided with a third supporting surface <NUM> flush with the first supporting surface <NUM>, one side, close to the first supporting member <NUM>, of the second fixing sub-member <NUM> is provided with a fourth supporting surface <NUM> flush with the second supporting surface <NUM>, and the second preset included angle is also formed between the fourth supporting surface <NUM> and the third supporting surface <NUM>. In this way, the first supporting surface <NUM> of the main body <NUM> and the third supporting surface <NUM> of the fixing member <NUM> together form a supporting surface for supporting the flexible display screen, and the second supporting surface <NUM> of the main body <NUM> and the fourth supporting surface <NUM> of the fixing member <NUM> together form a supporting surface for supporting the first supporting member <NUM>.

Further, as shown in <FIG>, at least one of the main body <NUM> and the fixing member <NUM> may be provided with a first guide portion, and the first supporting member <NUM> may be provided with a second guide portion in sliding fit with the first guide portion. Alternatively, a first guide portion is jointly formed between the main body <NUM> and the fixing member <NUM>, and the first supporting member <NUM> is provided with a second guide portion in sliding fit with the first guide portion. It can be understood that the first guide portion may be arranged on the main body <NUM>, or on the fixing member <NUM>, or may be formed by part of the main body <NUM> and part of the fixing member <NUM>. For example, in some examples, the first guide portion may be arranged on a side wall, close to the main body <NUM>, of the fixing member <NUM>. When the first transmission assembly <NUM> rotates relative to the base plate <NUM>, through sliding fit between the first guide portion and the second guide portion, the first supporting member <NUM> is driven to rotate. In some examples, the first guide portion includes at least one of a sliding groove and a sliding member, and the second guide portion includes at least one of a sliding groove and a sliding member that match the first guide portion. The structure of the sliding groove and the structure of the sliding member may be set according to actual situations, which is not limited in the disclosure.

In some examples, the first guide portion may include one of the first cambered groove <NUM> and the first cambered structure <NUM> that adapt to each other, and the second guide portion may include the other one of the first cambered groove <NUM> and the first cambered structure <NUM> that match each other. It can be understood that a side wall, close to the main body <NUM>, of the fixing member <NUM> is provided with one of the first cambered groove <NUM> and the first cambered structure <NUM> that match each other, the first supporting member <NUM> is provided with the other one of the first cambered groove <NUM> and the first cambered structure <NUM>, the first cambered structure <NUM> is arranged in the first cambered groove <NUM>, and an axial direction of the first cambered groove <NUM> and an axial direction of the first cambered structure <NUM> are both set in the second axial direction. When the first transmission assembly <NUM> rotates relative to the base plate <NUM>, the first cambered structure <NUM> slides along the first cambered groove <NUM>, so as to drive the first supporting member <NUM> to rotate.

In this way, when the first transmission assembly <NUM> rotates relative to the base plate <NUM>, the first supporting member <NUM> may be driven to rotate relative to the first transmission assembly <NUM> through cambered track matching between the first cambered groove <NUM> and the first cambered structure <NUM>, and the cambered track matching between the first cambered groove <NUM> and the first cambered structure <NUM> has certain guiding and limiting functions, improving stability of the first supporting member <NUM> during rotation. In the example, a side wall, close to the main body <NUM>, of the fixing member <NUM> is provided with the first cambered groove <NUM>, and the first supporting member <NUM> is provided with the first cambered structure <NUM>. It can be understood that, under the situation that one rotary shaft assembly <NUM> includes two first transmission assemblies <NUM>, two ends of the first supporting member <NUM> in a length direction may be provided with first cambered structures <NUM> respectively that match the first cambered grooves <NUM> of the fixing members <NUM> of the two first transmission assemblies <NUM> respectively.

In some examples, an accommodating space for accommodating part of the first supporting member <NUM> is defined by the fixing member <NUM> and the main body <NUM>. The first cambered structure <NUM> of the first supporting member <NUM> is in sliding fit with the first cambered groove <NUM> of the fixing member <NUM> in the accommodating space.

As shown in <FIG>, when the first supporting member <NUM> is assembled to the first transmission assembly <NUM>, the first transmission assembly <NUM> may be rotated to the main body <NUM> to be unfolded first. The first supporting member <NUM> is unfolded to be aligned with the main body <NUM>, which is shown in <FIG> and <FIG>. Then, the first cambered structure <NUM> of the first supporting member <NUM> is snapped into the first cambered groove <NUM> of the fixing member <NUM>, and then the whole is fixed to the main body <NUM>, so as to complete assembly, which is shown in <FIG>.

In some examples, as shown in <FIG>, <FIG> and <FIG>, the main body <NUM> is provided with a first positioning portion, and the fixing member <NUM> is provided with a second positioning portion in positioning fit with the first positioning portion. One of the first positioning portion and the second positioning portion may be a structure such as a positioning hole, a positioning column and a positioning groove, and the other one of the first positioning portion and the second positioning portion may be a structure such as a positioning column and a positioning member that match the positioning hole, the positioning column and the positioning groove, which is not limited in the disclosure.

In some examples, in some examples, the main body <NUM> is provided with one of the positioning member <NUM> and the positioning hole <NUM> which adapt to each other, and the fixing member <NUM> is provided with the other one of the positioning member <NUM> and the positioning hole <NUM>. When the fixing member <NUM> is connected to the main body <NUM>, the positioning member <NUM> penetrates the positioning hole <NUM>, so as to play a positioning role when the fixing member <NUM> is assembled and fixed to the main body <NUM>, improving assembly accuracy of the fixing member <NUM> and the main body <NUM>. In the example, the main body <NUM> is provided with a positioning hole <NUM>, and the fixing member <NUM> is provided with a positioning member <NUM>. The positioning hole <NUM> is a racetrack-shaped hole, and the positioning member <NUM> is of a racetrack-shaped structure. The positioning hole <NUM> and the positioning member <NUM> may be in other shapes according to actual situations, which is not limited in the disclosure.

In some examples, the main body <NUM> is provided with a first connection portion <NUM>, and the fixing member <NUM> is provided with a second connection portion <NUM> that is connected to and matches the first connection portion <NUM>. One of the first connection portion <NUM> and the second connection portion <NUM> may be a structure such as a connection hole, a screw hole, an unthreaded hole, a rivet hole and a connection groove, and the other one of the first connection portion <NUM> and the second connection portion <NUM> may be a structure such as a connection column, a connection member, a screw, a bolt and a rivet that matches the connection hole, the screw hole, the unthreaded hole, the rivet hole and the connection groove, which is not limited in the disclosure.

As shown in <FIG> and <FIG>, fastener <NUM> is used to connect the first connection portion <NUM> and the second connection portion <NUM>, and the fastener <NUM> may be a structure such as a screw, a bolt, a rivet or the like.

In some examples, one side, close to the fixing member <NUM>, of the main body <NUM> is provided with a mounting groove <NUM>. The mounting groove <NUM> matches the fixing member <NUM>, and the fixing member <NUM> is arranged in the mounting groove <NUM>, so as to be assembled and fixed to the main body <NUM>. The mounting groove <NUM> may be used for positioning and mounting the fixing member <NUM> during assembly, so as to improve assembly accuracy of the fixing member <NUM> and the main body <NUM>.

Further, a bottom surface of the mounting groove <NUM> may be recessed inwards to form a positioning groove, one side, close to the main body, of the fixing member <NUM> protrudes outwards to form a protruding portion <NUM>, and the protruding portion <NUM> is snapped in the positioning groove. Through snap fit between the positioning groove and the protruding portion <NUM>, the fixing member <NUM> may be further positioned, mounted and limited during assembly, assembly accuracy of the fixing member <NUM> and the main body <NUM> may be improved, and stability after the fixing member <NUM> is assembled and fixed to the main body <NUM> may be improved.

As shown in <FIG> and <FIG>, in some examples, the base plate <NUM> is provided with a first rotary shaft <NUM> arranged in the first axial direction, and the first transmission assembly <NUM> is rotatably connected to the first rotary shaft <NUM>, so as to be rotatably connected to the base plate <NUM> around the first axial direction.

Further, as shown in <FIG>, <FIG>, <FIG> and <FIG>, a surface of one side, close to the first transmission assembly <NUM>, of the base plate <NUM> is provided with a first accommodating groove <NUM>, the first accommodating groove <NUM> is a cambered groove, a bottom surface of the first accommodating groove <NUM> is a cambered bottom surface, and the first rotary shaft <NUM> is formed on a side wall of the first accommodating groove <NUM>. An end portion of one side, close to the base plate <NUM>, of the first transmission assembly <NUM> is provided with a second cambered structure <NUM>, and an outer cambered surface of the second cambered structure <NUM> adapts to the cambered bottom surface of the first accommodating groove <NUM>. In some examples, the second cambered structure <NUM> may be provided with an abutting and pushing portion <NUM>, an inner cambered surface of the second cambered structure <NUM> may be used as a cambered surface <NUM> of the abutting and pushing portion <NUM>, and an end portion of the second cambered structure <NUM> may be provided with an abutting and pushing surface <NUM>.

A side portion of the second cambered structure <NUM> in the first axial direction is provided with a guide groove <NUM>. The guide groove <NUM> is a cambered groove, and has the same curvature as the outer cambered surface of the second cambered structure <NUM>. The second cambered structure <NUM> is slidably arranged in the first accommodating groove <NUM>, and the first rotary shaft <NUM> is arranged in the guide groove <NUM>. When the first transmission assembly <NUM> rotates relative to the base plate <NUM>, the second cambered structure <NUM> slides along the cambered bottom surface of the first accommodating groove <NUM>, and the first rotary shaft <NUM> slides along the guide groove <NUM> relative to the second cambered structure <NUM>, such that the first transmission assembly <NUM> is rotatably connected to the base plate <NUM> around the first axial direction. In a rotation process of the first transmission assembly <NUM>, the guide groove <NUM> may guide the first transmission assembly <NUM>, so as to improve stability of rotation. In the example, two side walls of the first accommodating groove <NUM> are provided with the first rotary shafts <NUM>, two side portions of the second cambered structure <NUM> in the first axial direction are provided with the guide grooves <NUM>, and two sides of the second cambered structure <NUM> match with the first rotary shafts <NUM> on two sides of the first accommodating groove <NUM> by means of the guide grooves <NUM>, so as to further improve stability when the first transmission assembly <NUM> rotates relative to the base plate <NUM>.

In some examples, the rotary shaft apparatus <NUM> may further include a rotary shaft cover <NUM> covering one side, away from the first supporting plane <NUM> of the base plate <NUM>, of the base plate <NUM>, so as to improve overall structural strength of the rotary shaft apparatus <NUM>. In some examples, the rotary shaft cover <NUM> may be fixedly connected to the base plate <NUM> by a fastener such as a screw, a bolt and a rivet. The first transmission assembly <NUM> is provided with a first limiting structure, and at least one of the base plate <NUM> and the rotary shaft cover <NUM> is provided with a second limiting structure in limiting fit with the first limiting structure. When the first transmission assembly <NUM> rotates, through limiting fit between the first limiting structure and the second limiting structure, the first transmission assembly <NUM> may be limited, and the first transmission assembly <NUM> is prevented from slipping off the base plate <NUM>, so as to improve stability of the rotary shaft apparatus <NUM> during rotation. It can be understood that the second limiting structure may be arranged on the base plate <NUM> or on the rotary shaft cover <NUM>, which is not limited in the disclosure.

In some examples, the first limiting structure includes at least one of a limiting groove and a limiting portion, and the second limiting structure includes at least one of a limiting groove and a limiting portion that adapt to the first limiting structure.

For example, in some examples, one side, away from the first supporting member <NUM>, of the first transmission assembly <NUM> is provided with a first limiting groove <NUM>, the base plate <NUM> is provided with a first limiting portion <NUM> adapting to the first limiting groove <NUM>, and the first limiting portion <NUM> is arranged in the first limiting groove <NUM>. When the first transmission assembly <NUM> rotates relative to the base plate <NUM>, the first limiting portion <NUM> slides along the first limiting groove <NUM> relative to the first transmission assembly <NUM>. In a rotation process of the first transmission assembly <NUM>, through matching between the first limiting portion <NUM> and the first limiting groove <NUM>, the first transmission assembly <NUM> may be limited, and the first transmission assembly <NUM> is prevented from slipping off the base plate <NUM>, so as to improve stability of the first transmission assembly <NUM> during rotation.

For example, in some other examples, one side, away from the first supporting member <NUM>, of the first transmission assembly <NUM> is provided with a second limiting groove <NUM>, and a side portion of the rotary shaft cover <NUM> is provided with a second limiting portion <NUM> adapting to the second limiting groove <NUM>. When the first transmission assembly <NUM> rotates to a preset position relative to the base plate <NUM>, the second limiting portion <NUM> is snapped in the second limiting groove <NUM>. In some examples, the second limiting portion <NUM> may be formed at a side edge of the rotary shaft cover <NUM>. In the example, the second limiting groove <NUM> may be provided in the main body <NUM> of the first transmission assembly <NUM>.

The specified position may refer to a position to which the first transmission assembly <NUM> rotates relative to the base plate <NUM> to make the rotary shaft apparatus <NUM> in the unfolded state. Through matching between the second limiting portion <NUM> and the second limiting groove <NUM>, the first transmission assembly <NUM> may be limited, and the first transmission assembly <NUM> is prevented from slipping off the base plate <NUM>, so as to keep the first transmission assembly <NUM> at this position, and further improve stability of the rotary shaft apparatus <NUM> in the unfolded state. In some examples, as shown in <FIG>, one side, away from the first supporting member <NUM>, of the second transmission assembly <NUM> is provided with a third limiting groove <NUM> in limiting fit with the second limiting portion <NUM>. When the first transmission assembly <NUM> rotates relative to the base plate <NUM> to a set position, the second limiting portion <NUM> is snapped into the second limiting groove <NUM> and the third limiting groove <NUM> simultaneously, so as to further improve stability of the rotary shaft apparatus <NUM> in the unfolded state.

As shown in <FIG> and <FIG>, in some examples, the base plate <NUM> is provided with a first track shaft <NUM> parallel to the first axial direction, and the first supporting member <NUM> is provided with a first track groove in sliding fit with the first track shaft <NUM>. In some examples, the first track groove may be a cambered track groove, like the first cambered track groove <NUM> shown in the figure, and may be grooves in other shapes, which is not limited in the disclosure. When the first supporting member <NUM> rotates relative to the first transmission assembly <NUM>, the first track shaft <NUM> may slide along the first cambered track groove <NUM>. Through matching between the first cambered track groove <NUM> and the first track shaft <NUM>, auxiliary guide and auxiliary limiting effects may be achieved on the first supporting member <NUM> during rotation, so as to further improve stability of the first supporting member <NUM> during rotation.

For example, in some examples, the first supporting member <NUM> is provided with a first track structure <NUM>, and a side portion of the first track structure <NUM> in the first axial direction is provided with a first cambered track groove <NUM>. The base plate <NUM> is provided with a first track shaft <NUM> parallel to the first axial direction, and the first track shaft <NUM> is arranged in the first cambered track groove <NUM>. The first cambered track groove <NUM> may be adaptively provided according to a rotation track of the first supporting member <NUM> rotating relative to the first transmission assembly <NUM>. When the first supporting member <NUM> rotates relative to the first transmission assembly <NUM>, the first track shaft <NUM> may slide along the first cambered track groove <NUM> relative to the first track structure <NUM>. Through matching between the first cambered track groove <NUM> and the first track shaft <NUM>, auxiliary guide and auxiliary limiting effects may be achieved on the first supporting member <NUM> during rotation, so as to further improve stability of the first supporting member <NUM> during rotation. In some examples, a plurality of first track structures <NUM> may be arranged in a length direction of the first supporting member <NUM> at intervals, and match the first cambered grooves <NUM> of the fixing members <NUM> of the two first transmission assemblies <NUM> respectively. The base plate <NUM> may be provided with a plurality of first track shafts <NUM> corresponding to the plurality of first track structures <NUM>, so as to improve stability of the first supporting member <NUM> during rotation. The structure of the first cambered track groove <NUM> may be a segment of cambered structure or a plurality of segments of cambered structure, which is determined according to actual situations and is not limited in the disclosure.

When the first supporting member <NUM> is assembled to the first transmission assembly <NUM>, the first transmission assembly <NUM> is rotated to the main body <NUM> to be unfolded first, then the first track structure <NUM> of the first supporting member <NUM> is snapped to the first track shaft <NUM> of the base plate <NUM>, and the first supporting member <NUM> is unfolded to be aligned with the main body <NUM>. Then the first cambered structure <NUM> of the first supporting member <NUM> is snapped into the first cambered groove <NUM> of the fixing member <NUM>, and the whole is fixed to the main body <NUM>, so as to complete assembly.

Further, a surface of one side, close to the first supporting member <NUM>, of the base plate <NUM> is provided with a second accommodating groove <NUM>, the second accommodating groove <NUM> is a cambered groove, a bottom surface of the second accommodating groove <NUM> is a cambered bottom surface, and the first track shaft <NUM> is arranged on a side wall of the second accommodating groove <NUM>. The first track structure <NUM> may be set as a cambered structure adapting to the second accommodating groove <NUM>. The first track structure <NUM> is slidably arranged in the second accommodating groove <NUM>, such that through adapting to between the first track structure <NUM> and the second accommodating groove <NUM>, the first supporting member <NUM> may rotate relative to the base plate <NUM>.

Those skilled in the art could easily conceive of other implementation solutions of the disclosure upon consideration of the description and the disclosure disclosed in the implementations. The disclosure is intended to cover any variations, uses or adaptive changes of the disclosure, which follow the general principles of the disclosure and include common general knowledge or customary technical means, which is not disclosed in the disclosure, in the art. The description and the examples are to be regarded as illustrative merely, and the true scope of the disclosure are indicated by the following claims.

Claim 1:
A rotary shaft apparatus, comprising:
a base plate (<NUM>); and
a rotary shaft assembly (<NUM>), comprising a first transmission assembly (<NUM>), a second transmission assembly (<NUM>) and a first supporting member (<NUM>); the first transmission assembly (<NUM>) is rotatably connected to the base plate (<NUM>) around a first axial direction; the first supporting member (<NUM>) is rotatably connected to the first transmission assembly (<NUM>) around a second axial direction parallel to the first axial direction, and is movably connected to the second transmission assembly (<NUM>); and the second transmission assembly (<NUM>) is rotatably connected to the base plate (<NUM>) around a third axial direction parallel to the first axial direction;
characterized in that,
the rotary shaft apparatus further comprises a second supporting member (<NUM>) movably arranged on the base plate (<NUM>) in a direction perpendicular to the first axial direction; the base plate (<NUM>) comprises a first supporting plane (<NUM>), the first supporting member (<NUM>) comprises a second supporting plane (<NUM>), and the second supporting member (<NUM>) comprises a third supporting plane (<NUM>);
the rotary shaft apparatus (<NUM>) has an unfolded state and a folded state; in the unfolded state, the second supporting member (<NUM>) is at a first position, and the third supporting plane (<NUM>) and the second supporting plane (<NUM>) are on the same plane;
in the folded state, a first preset included angle is between the second supporting plane (<NUM>) and the first supporting plane (<NUM>), the second supporting member (<NUM>) is at a second position, and the second position is closer to the base plate (<NUM>) than the first position; and the first supporting member (<NUM>) and the second supporting member (<NUM>) define a screen-accommodating space.