Patent Description:
With development of terminal technologies, a terminal is increasingly extensively used, and has become one of the most important tools in people's daily work and life. A foldable terminal is gradually favored by people because of a small occupied space and high portability.

The foldable terminal performs a folding function mainly by using a foldable mechanism, and a main component of the foldable mechanism is a rotating assembly. The rotating assembly mainly includes a base, a rotating shaft, and a swing arm. The swing arm is rotatably connected to the base by using the rotating shaft. When the swing arm of the rotating assembly rotates relative to the base, the foldable mechanism is enabled to be folded.

Then, when the foldable mechanism is applied to the foldable terminal, two sides of the foldable mechanism are connected to two bodies of the foldable terminal respectively. When a user moves the bodies, the swing arm can rotate around the rotating shaft, and a screen of the foldable terminal is bent at a position corresponding to the foldable mechanism. After the two bodies of the foldable terminal are folded in half, the screen forms a semicircular structure at the position corresponding to the foldable mechanism, and a radius of this semicircular structure may be referred to as a bending radius of the screen. Although the screen can be bent, the screen has poor tensile elasticity. Therefore, to protect the screen, the bending radius of the screen is usually relatively large.

Because a rotation radius of the swing arm is related to the bending radius of the screen, when the bending radius of the screen is relatively large, the rotation radius of the swing arm also needs to be relatively large. As a result, a rotating assembly is relatively long and occupies a relatively large space in the foldable mechanism, the foldable mechanism is also relatively long, and then the foldable mechanism occupies a relatively large space in the foldable terminal. <CIT> discloses a foldable mobile terminal with a hinge and support structure. <CIT> discloses a hinge mechanism for foldable screens enhancing user grip and aesthetics. <CIT> discloses a protective casing for foldable screens to improve durability and aesthetics. <CIT> discloses a compact hinge mechanism for foldable devices minimizing space usage. <CIT> discloses a flexible screen folding mechanism preventing screen damage during folding. <CIT> discloses a sliding hinge for flexible screens ensuring smooth folding and unfolding.

This application provides a rotating assembly, a foldable mechanism, and a foldable terminal, to overcome the problems with related technologies. The technical solutions are as follows.

According to an aspect, this application provides a rotating assembly, where the rotating assembly includes a base, a rotating shaft, and a swing arm;.

When a foldable mechanism with the rotating assembly is applied to a foldable terminal, the swing arm of the rotating assembly can switch a rotation axis and the rotation radius throughout the rotation, and the rotation radius in the first angle range is greater than that in the second angle range. A large rotation radius in the first angle range makes the swing arm rotate relatively gently, which can reduce a pulling force on the screen from flattening to folding, thereby protecting the screen. A small rotation radius in the second angle range can reduce a size of the rotating assembly.

In addition, the reduction of the size of the rotating assembly can reduce the space in the foldable mechanism that is occupied by the rotating assembly, thereby reducing the size of the foldable mechanism. Once the size of the foldable mechanism is reduced, the space in the foldable terminal that is occupied by the foldable mechanism can be reduced, thereby reducing the size of the foldable terminal, so that the size of the foldable terminal can be minimized on the basis of meeting folding requirements.

In a possible implementation, the swing arm includes a body connecting portion, a sliding portion, and a locking portion, where the body connecting portion, the sliding portion, and the locking portion are sequentially connected, and the locking portion is located on a side portion of the sliding portion and far away from an end portion of the body connecting portion; and
the sliding portion and the locking portion each have an arc-shaped structure, the sliding portion fits with the continuous slideway, and the locking portion fits with the second slideway.

In an example, the sliding portion and the locking portion each have an arc-shaped structure and fit with the continuous slideway, and the sliding portion and the locking portion can be inserted in the continuous slideway and slide in the continuous slideway.

In a possible implementation, when a rotation angle of the swing arm is a minimum angle of the first angle range, an end portion that is of the locking portion and that is far away from the body connecting portion is in contact with an end portion that is of the first slideway and that is far away from the second slideway; or
when the rotation angle of the swing arm is a maximum angle of the first angle range, the locking portion is located in the second slideway, and an end portion that is of the locking portion and that is close to the body connecting portion is in contact with an end portion that is of the second slideway and that is far away from the first slideway.

In this way, during rotation of the swing arm from the maximum angle to the minimum angle of the first angle range, the end portion that is of the locking portion and that is far away from the body connecting portion is in contact with the end portion that is of the first slideway and that is far away from the second slideway, so that the swing arm can be restrained from continuing to slide in an original direction in the continuous slideway.

During rotation of the swing arm from the minimum angle to the maximum angle in the first angle range, the end portion that is of the locking portion and that is close to the body connecting portion is in contact with the end portion that is of the second slideway and that is far away from the first slideway, so that the swing arm can be restrained from continuing to slide in the original direction in the continuous slideway.

During rotation of the swing arm from a maximum angle to a minimum angle in the second angle range, contact between a first limiting platform and a second limiting platform can restrain the rotating shaft from rotating in the original direction in the rotating shaft through-hole.

As for manners for restraining the rotating shaft from rotating in the original direction in the rotating shaft through-hole during the rotation of the swing arm from the minimum angle to the maximum angle in the second angle range, one manner may be implemented through contact between swing arms on two sides of the base, another manner may be implemented through contact between a third limiting platform and the locking portion, and still another manner may be implemented through contact between the third limiting platform and a fourth limiting platform.

In a possible implementation, an arc length of the locking portion is less than that of the second slideway.

In an example, the arc length of the locking portion is less than that of the second slideway, to make the locking portion completely located in the second slideway, so that when the locking portion is driving the rotating shaft to rotate, the end portion that is of the locking portion and that is far away from the body connecting portion does not interfere with the rotation of the locking portion with the rotating shaft.

In a possible implementation, an inner wall of the rotating shaft through-hole is provided with the first limiting platform, an outer surface of the rotating shaft is provided with the second limiting platform, and the second limiting platform and the first limiting platform are located in a same circumferential direction; and
when the rotation angle of the swing arm is a minimum angle of the second angle range, the first limiting platform is in contact with the second limiting platform, and the first slideway and the second slideway can be connected to each other to form the continuous slideway.

In an example, during rotation of the swing arm from the maximum angle to the minimum angle in the second angle range, the contact between the first limiting platform and the second limiting platform can restrain the rotating shaft from rotating in the original direction in the rotating shaft through-hole, so that the first slideway and the second slideway are connected to form the continuous slideway for the swing arm to slide along the continuous slideway in a subsequent process.

In a possible implementation, the inner wall of the rotating shaft through-hole is provided with the third limiting platform; and
the third limiting platform is configured in such a way that the third limiting platform restrains the swing arm from rotating in an original direction when the rotation angle of the swing arm changes from the minimum angle of the second angle range to a maximum angle of the second angle range.

In a possible implementation, when the rotation angle of the swing arm is the maximum angle of the second angle range, the third limiting platform is in contact with the swing arm.

In this way, during the rotation of the swing arm from the minimum angle to the maximum angle in the second angle range, the contact between the third limiting platform and the swing arm can restrain the rotating shaft from rotating in the original direction in the rotating shaft through-hole.

In a possible implementation, the outer surface of the rotating shaft is provided with the fourth limiting platform, and the fourth limiting platform and the third limiting platform are located in a same circumferential direction;.

In this way, during the rotation of the swing arm from the minimum angle to the maximum angle in the second angle range, the contact between the third limiting platform and the fourth limiting platform can restrain the rotating shaft from rotating in the original direction in the rotating shaft through-hole.

In a possible implementation, the first slideway is located at a position that is in the rotating shaft through-hole and that is far away from the swing arm.

In an example, to make the swing arm first rotate in the first angle range and then rotate in the second angle range, correspondingly, the first slideway is located at a position that is in the rotating shaft through-hole and that is far away from the swing arm. In this way, during the rotation from the minimum rotation angle to the maximum rotation angle, the swing arm can first rotate in the first angle range and then rotate in the second angle range.

In a possible implementation, the rotating shaft includes an assembly column and two support columns;.

In this way, the second slideway, the second limiting platform, and the fourth limiting platform of the rotating shaft are all arranged on the assembly column, and the assembly column is configured to implement assembly with the swing arm. The support columns are configured to implement assembly with the base, a cross-section of each of the support columns may be circular, and the support columns with circular cross-sections are located in the second-section through-holes with circular cross-sections, so that the rotating shaft can smoothly rotate in the rotating shaft through-hole.

In a possible implementation, two rotating shaft and two swing arms are provided;.

In an example, when the rotating assembly is applied to a foldable terminal, the swing arm installed on the first side portion is connected to one body of the foldable terminal, and the swing arm installed on the second side portion is connected to the other body of the foldable terminal, to implement a folding function of the foldable terminal.

In a possible implementation, the maximum angle of the first angle range is equal to the minimum angle of the second angle range.

The maximum angle of the first angle range is equal to the minimum angle of the second angle range, so that the two angle ranges are connected.

According to another aspect, a foldable mechanism is provided, where the foldable mechanism includes a door plate and the foregoing rotating assembly; and
the door plate is located on a surface of the body connecting portion of the swing arm, and is configured to support a screen of a foldable terminal at which the foldable mechanism is located.

In an example, after the rotating shaft and the swing arm are assembled in the base, the door plate may be laid on a surface of the body connecting portion of the swing arm, the door plate is rotably connected to the body connecting portion of the swing arm, and a surface that is of the body connecting portion of the swing arm and that faces away from the door plate is used to fixedly connect the body.

In a possible implementation, the foldable mechanism further includes a fastener, a limiting pin, a connecting plate, and a connecting shaft, where.

In an example, when the swing arm is switched from driving the rotating shaft to rotate to sliding in the continuous slideway, the rotation radius of the swing arm becomes larger, and the connecting plate slides in a direction away from the door plate to increase the rotation radius of the door plate, so as to adapt to the increase of the rotation radius of the swing arm. When the swing arm is switched from sliding in the continuous slideway to driving the rotating shaft to rotate, the rotation radius of the swing arm becomes smaller, and the connecting plate slides in a direction close to the door plate to reduce the rotation radius of the door plate, so as to adapt to the reduction of the rotation radius of the swing arm.

It can be learned that during rotation of the swing arm, the door plate rotates around the connecting shaft under the driving of the connecting plate, to rotate with the swing arm. When the swing arm switches the rotation radius, the connecting plate slides left and right relative to the door plate to adjust the rotation radius of the door plate to adapt to a change in the rotation radius of the swing arm, so that the door plate does not interfere with the movement of the swing arm during the rotation of the swing arm.

According to another aspect, a foldable terminal is further provided, where the foldable terminal includes a first body, a second body, a screen, and the foregoing foldable mechanism; and
the foldable mechanism is connected between the first body and the second body, and the screen is located on surfaces of the first body, the second body, and the foldable mechanism, and is fastened to the first body and the second body.

When the foldable mechanism with the rotating assembly is applied to the foldable terminal, when rotating in a first angle range, a swing arm of the rotating assembly slides in a continuous slideway, and moves, relative to a base, circularly around a center of a circle where a first slideway is located; and when rotating in a second angle range, the swing arm drives a rotating shaft to rotate, and moves circularly around an axis of the rotating shaft relative to the base, and a rotation radius of the swing arm in the first angle range is greater than that in the second angle range. It can be learned that the swing arm of the rotating assembly can switch a rotation axis and the rotation radius during the entire rotation, and the rotation radius of the swing arm in the first angle range is large, so that the swing arm rotates relatively gently in the first angle range, which can reduce a pulling force on the screen from flattening to bending, thereby protecting the screen. The swing arm has a small rotation radius in the second angle range, which can reduce a length of the rotating assembly, and then reduce a space in the foldable mechanism that is occupied by the rotating assembly, and reduce a size of the foldable mechanism, thereby reducing a space in the foldable terminal that is occupied by the foldable mechanism.

In addition, the reduction of the space in the foldable terminal that is occupied by the foldable mechanism can further reduce a size of the foldable terminal, so that the size of the foldable terminal can be minimized on the basis of meeting folding requirements.

It should be understood that the foregoing general descriptions and the following detailed descriptions are only examples and are explanatory, and cannot limit this application.

The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments that conform to this application, and are used together with the specification to explain the principles of this application. In the drawings:.

Example embodiments are described in detail herein, and examples thereof are shown in the accompanying drawings. When the accompanying drawings are involved in the following description, unless otherwise indicated, the same numerals in different accompanying drawings indicate the same or similar elements. The implementations described in the following example embodiments do not represent all the implementations consistent with this application. On the contrary, the implementations are only examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

<FIG> is a schematic exploded view of a structure of a foldable terminal according to an embodiment of this application. Although a mobile phone is used as an example in <FIG>, it can be understood that the foldable terminal is not limited to a mobile phone, but may alternatively be a tablet computer, a display, or the like.

As shown in <FIG>, the foldable terminal includes a foldable mechanism <NUM>, a first body <NUM>, a second body <NUM>, and a screen <NUM>. As shown in <FIG> and referring to <FIG>, the foldable mechanism <NUM> is located between the first body <NUM> and the second body <NUM>, one side of the foldable mechanism <NUM> is connected to the first body <NUM>, and the other side of the foldable mechanism <NUM> is connected to the second body <NUM>. The screen <NUM> is located on surfaces of the first body <NUM>, the second body <NUM>, and the foldable mechanism <NUM>, and the screen <NUM> is fastened to the first body <NUM> and the second body <NUM>. The screen <NUM> is a flexible screen that can be bent.

The foldable terminal can be folded and bent under an action of the foldable mechanism <NUM>, to implement flattening and folding in half. <FIG> is a schematic diagram of a structure of the foldable terminal in a flattened state. A first body <NUM> and a second body <NUM> are roughly located in a same plane, and a screen <NUM> is laid on surfaces of the first body <NUM>, a foldable mechanism <NUM>, and the second body <NUM>. <FIG> is a schematic diagram of a structure of the foldable terminal in a state of being folded in half. A first body <NUM> and a second body <NUM> are roughly parallel to each other, and a screen <NUM> is folded in a space enclosed by the first body <NUM>, a foldable mechanism <NUM>, and the second body <NUM>.

For a specific structure of the foldable mechanism <NUM>, refer to <FIG> and <FIG>. <FIG> is a schematic exploded view of a structure of a foldable mechanism <NUM>, where (a) in <FIG> is a schematic exploded view of a structure of the foldable mechanism <NUM> with a first surface upward, and (b) in <FIG> is a schematic exploded view of a structure of the foldable mechanism <NUM> with a second surface upward. A position of the first surface is opposite to a position of the second surface, for example, the first surface is a back surface of the foldable mechanism, and the second surface is a front surface of the foldable structure.

<FIG> is a schematic diagram of an assembled structure of a foldable mechanism <NUM>, where (a) in <FIG> corresponds to (a) in <FIG> and is a schematic diagram of an assembled structure of a foldable mechanism <NUM> with a first surface upward, and (b) in <FIG> corresponds to (b) in <FIG> and is a schematic diagram of an assembled structure of a foldable mechanism <NUM> with a second surface upward.

As shown in <FIG>, the folding structure <NUM> includes a rotating assembly <NUM> and a door plate <NUM>, where the rotating assembly <NUM> is a core assembly of the foldable mechanism <NUM> to achieve a folding function thereof. As shown in <FIG> and referring to <FIG>, the rotating assembly <NUM> includes a base <NUM>, rotating shafts <NUM>, and swing arms <NUM>, where a rotating shaft <NUM> and a swing arm <NUM> are installed on one side of the base <NUM>, and a rotating shaft <NUM> and a swing arm <NUM> are also installed on the other side of the base <NUM>. As shown in (a) in <FIG>, a part of the swing arm <NUM> is installed in the base <NUM>, and the other part thereof extends out of the base <NUM>.

As shown in <FIG> and referring to <FIG>, the door plate <NUM> is located on a surface of the swing arm <NUM>. For example, as shown in <FIG>, the door plate <NUM> is located on a surface of the part that is of the swing arm <NUM> and that extends out of the base <NUM>. As shown in <FIG>, the door plate <NUM> is configured to support the screen <NUM>.

When the foldable mechanism <NUM> is applied to a foldable terminal, as shown in <FIG> and referring to <FIG>, a surface that is of the swing arm <NUM> on one side of the foldable mechanism <NUM> and that faces away from the door plate <NUM> is connected to the first body <NUM>, a surface that is of the swing arm <NUM> on the other side of the foldable mechanism <NUM> and that faces away from the door plate <NUM> is connected to the second body <NUM>, and the screen <NUM> is located on surfaces of the first body <NUM>, the door plate <NUM> of the foldable mechanism <NUM>, and the second body <NUM>.

The foldable terminal performs the folding function under the action of the foldable mechanism, and a key component of the foldable mechanism is the rotating assembly <NUM> that can rotate. The rotating assembly <NUM> is described in detail below.

<FIG> is a schematic exploded view of a structure of the rotating assembly <NUM>. <FIG> is a schematic diagram of an assembled structure of the rotating assembly <NUM>. As shown in <FIG>, the rotating assembly includes a base <NUM>, a rotating shaft <NUM>, and a swing arm <NUM>, where the swing arm <NUM> shown in <FIG> and <FIG> is a part of the swing arm <NUM> in <FIG>, the swing arm <NUM> shown in subsequent figures is also a part of the swing arm <NUM> in <FIG>, and this part is used to assemble with the rotating shaft <NUM> and the base <NUM>.

As shown in <FIG> and referring to <FIG>, both the rotating shaft <NUM> and the swing arm <NUM> are installed in the base <NUM>, and both the rotating shaft <NUM> and the swing arm <NUM> can rotate relative to the base <NUM>. When rotating, the swing arm <NUM> can drive the body connected thereto to rotate, thereby implementing a bending function of the foldable mechanism.

As shown in <FIG>, the rotating assembly is a double swing arm type rotating assembly, with two rotating shafts <NUM> and two swing arms <NUM>, one rotating shaft <NUM> and one swing arm <NUM> are installed on a first side portion <NUM> of the base <NUM>, and the other rotating shaft <NUM> and the other swing arm <NUM> are installed on a second side portion <NUM> of the base <NUM>. In this solution, as shown in <FIG>, a position of the swing arm <NUM> located on the first side portion <NUM> and a position of the swing arm <NUM> located on the second side portion <NUM> are symmetrical with respect to a central line of the base <NUM>. This design can reduce a size of the rotating assembly in an axial direction. That is, as shown in <FIG>, this design can reduce a length of the rotating assembly in a y-axis.

Certainly, for the double swing arm type rotating assembly, the two swing arms <NUM> located on different sides of the base <NUM> may not be symmetrical with each other. For example, as shown in (a) in <FIG>, a first side portion <NUM> and a second side portion <NUM> of a base <NUM> are still distributed left and right, but one swing arm <NUM> is located at an upper position of the first side portion <NUM>, and the other swing arm <NUM> is located at a lower position of the second side portion <NUM>. For another example, as shown in (b) in <FIG>, the first side portion <NUM> and the second side portion <NUM> of the base <NUM> are vertically distributed, but the swing arm <NUM> located on the first side portion <NUM> and the swing arm <NUM> located on the second side portion <NUM> are staggered. The staggering of the two swing arms <NUM> located on different sides of the base <NUM> can reduce the size in the axial direction perpendicular to the rotating assembly. That is, as shown in (b) in <FIG>, the design can reduce a length of the rotating assembly in an x-axis direction.

In the solution in which the rotating assembly includes two swing arms <NUM> and two rotating shafts <NUM>, a positional relationship between the two swing arms <NUM> located on different sides of the base <NUM> is not limited in this embodiment, and may be flexibly selected based on an actual situation.

When the double swing arm type rotating assembly is applied to a foldable terminal, as shown in <FIG> and referring to <FIG>, the swing arm <NUM> on the first side portion <NUM> of the base <NUM> may be connected to the first body <NUM>, and the swing arm <NUM> on the second side portion <NUM> of the base <NUM> may be connected to the second body <NUM>, so that when the two swing arms <NUM> rotate, the first body <NUM> and the second body <NUM> can be bent at the foldable mechanism <NUM>.

In the foregoing case, the rotating assembly is a double swing arm type rotating assembly. However, in some other examples, the rotating assembly may alternatively be a single swing arm type rotating assembly, where one rotating shaft <NUM> and one swing arm <NUM> are provided, and the rotating shaft <NUM> and the swing arm <NUM> are installed on the first side portion <NUM> or the second side portion <NUM> of the base <NUM>.

When the single swing arm type rotating assembly is applied to a foldable terminal, the swing arm <NUM> on one side of the base <NUM> may be connected to the first body <NUM>, and the other side portion of the base <NUM> may be connected to the second body <NUM>, so that when the swing arm <NUM> drives the first body <NUM> to rotate, the first body <NUM> may be bent relative to the second body <NUM>.

Certainly, in some other examples, as shown in <FIG>, the rotating assembly may alternatively be a multi-swing arm type rotating assembly, and two or more rotating shafts <NUM> and two or more swing arms <NUM> are provided. As shown in <FIG>, a plurality of rotating shafts <NUM> and a plurality of swing arms <NUM> are installed on a first side portion <NUM> of a base <NUM>, a plurality of rotating shafts <NUM> and a plurality of swing arms <NUM> are installed on a second side portion <NUM> of the base <NUM>, and a quantity of the swing arms <NUM> at the first side portion <NUM> may be equal or unequal to a quantity of the swing arms <NUM> at the second side portion <NUM>.

When the multi-swing arm type rotating assembly is applied to a foldable terminal, the plurality of swing arms <NUM> at the first side portion <NUM> of the base <NUM> are connected to the first body <NUM>, and the plurality of swing arms <NUM> at the second side portion <NUM> of the base <NUM> are connected to the second body <NUM>, so that when the swing arms <NUM> on the two sides of the base <NUM> rotate, the first body <NUM> and the second body <NUM> can be bent at the foldable mechanism <NUM>.

Regardless of how many swing arms <NUM> are included in the rotating assembly, a specific structure of each rotating shaft <NUM>, a specific structure of each swing arm <NUM>, and installation relationships between each rotating shaft <NUM> and the base <NUM> and between each swing arm <NUM> and the base <NUM> are roughly the same, and the rotating shaft <NUM> and the swing arm <NUM> on one side (for example, on the right side) of the base <NUM> may be used as an example for description, as shown in <FIG>.

An example in which the rotating shaft <NUM> and the swing arm <NUM> are installed on the second side portion <NUM> of the base <NUM> shown in <FIG> is used below for description, and a case where the rotating shaft <NUM> and the swing arm <NUM> are installed on the first side portion <NUM> of the base <NUM> is similar thereto, and therefore details are not described again.

<FIG> is a schematic exploded view of a partial structure of a rotating assembly. As shown in <FIG> and referring to <FIG>, a base <NUM> is provided with a rotating shaft through-hole <NUM> and an arc-shaped first slideway <NUM>. As shown in <FIG>, the first slideway <NUM> is located at a position of the rotating shaft through-hole <NUM> far away from a swing arm <NUM>. As shown in <FIG> and referring to <FIG>, one end of the first slideway <NUM> communicates with the rotating shaft through-hole <NUM>, an axis L1 of the first slideway <NUM> is parallel to an axis L2 of the rotating shaft through-hole <NUM>, and one end of the first slideway <NUM> is an end portion in a sliding direction.

As shown in <FIG> and referring to <FIG>, the axis L2 of the rotating shaft through-hole <NUM> is a straight line passing through a center of the rotating shaft through-hole <NUM> and in an axial direction. As shown in <FIG> and referring to <FIG>, the axis L1 of the first slideway <NUM> is a central line of a circle where the arc-shaped first slideway <NUM> is located.

It should be noted that a quantity of rotating shaft through-holes <NUM> is related to a quantity of rotating shaft <NUM>, and a quantity of first slideways <NUM> is related to a quantity of swing arms <NUM>. For example, as shown in <FIG>, for a double swing arm type rotating assembly, two rotating shafts <NUM> and two swing arms <NUM> are provided. Then the first side portion <NUM> and the second side portion <NUM> of the base <NUM> are each provided with a rotating shaft through-hole <NUM> and a first slideway <NUM>. As shown in <FIG>, the first slideway <NUM> of the first side portion <NUM> is adjacent to the first slideway <NUM> of the second side portion <NUM>. In this way, in subsequent assembly, the two rotating shafts are located in the rotating shaft through-hole <NUM> of the first side portion <NUM> and the rotating shaft through-hole of the second side portion <NUM> respectively, and the two swing arms <NUM> are located in a continuous slideway <NUM>-<NUM> of the first side portion <NUM> and a continuous slideway <NUM>-<NUM> of the second side portion <NUM> respectively.

As shown in <FIG> and referring to <FIG>, the rotating shaft <NUM> is provided with an arc-shaped second slideway <NUM>, and an axis L3 of the rotating shaft <NUM> is parallel to an axis L4 of the second slideway <NUM>. As shown in <FIG> and referring to <FIG>, the axis L3 of the rotating shaft <NUM> is a straight line passing through a center of the rotating shaft <NUM> and in an axial direction. The axis L4 of the second slideway <NUM> is a central line of a circle where the arc-shaped second slideway <NUM> is located.

It should be noted that, as shown in <FIG>, the axis L1 of the first slideway <NUM>, the axis L2 of the rotating shaft through-hole, the axis L3 of the rotating shaft <NUM>, and the axis L4 of the second slideway <NUM> are theoretically parallel to each other.

As shown in <FIG> and referring to <FIG>, the second slideway <NUM> runs through the rotating shaft <NUM>, where the second slideway <NUM> runs through the rotating shaft <NUM>, that is, as shown in <FIG>, one end of the second slideway <NUM> is located at an outer surface of the rotating shaft <NUM>, and the other end of the second slideway <NUM> is also located at the outer surface of the rotating shaft <NUM>.

As shown in <FIG>, a rotating shaft <NUM> is rotatably installed in a rotating shaft through-hole <NUM> of a base <NUM>. Correspondingly, the rotating shaft <NUM> matches the rotating shaft through-hole <NUM> of the base <NUM>. For example, an outer diameter of the rotating shaft <NUM> is slightly less than an inner diameter of the rotating shaft through-hole <NUM>, and a length of the rotating shaft <NUM> is slightly less than that of the rotating shaft through-hole <NUM>. As shown in <FIG>, the rotating shaft <NUM> can be located in the rotating shaft through-hole <NUM>, and the rotating shaft <NUM> can rotate in the rotating shaft through-hole <NUM>. (a) in <FIG> is a schematic diagram of the rotating shaft <NUM> rotating to a position where a first slideway <NUM> and a second slideway <NUM> are staggered, and (b) in <FIG> is a schematic diagram of the rotating shaft <NUM> rotating to a position where the first slideway <NUM> and the second slideway <NUM> are connected to each other.

As shown in <FIG>, a radius of the first slideway <NUM> of the base <NUM> is equal to that of the second slideway <NUM> of the rotating shaft <NUM>, and its value may be denoted as R. In this way, as shown in <FIG>, one end of the first slideway <NUM> communicates with the rotating shaft through-hole <NUM>. As shown in <FIG>, the second slideway <NUM> runs through the rotating shaft <NUM>. As shown in <FIG>, the radius of the first slideway <NUM> is equal to that of the second slideway <NUM>. Therefore, as shown in <FIG>, when the rotating shaft <NUM> rotates in the rotating shaft through-hole <NUM> in a first direction (for example, a clockwise direction) until an end portion of the first slideway <NUM> is connected to an end portion of the second slideway <NUM>, the first slideway <NUM> and the second slideway <NUM> can form a continuous slideway, and the continuous slideway may be denoted as a continuous slideway <NUM>-<NUM>.

As shown in (b) in <FIG>, after the rotating shaft <NUM> rotates in the first direction (for example, the clockwise direction) until the first slideway <NUM> and the second slideway <NUM> are connected to form the continuous slide <NUM>-<NUM>, the rotating shaft <NUM> no longer continues rotating in the first direction. Correspondingly, as shown in (a) in <FIG>, an inner wall of the rotating shaft through-hole <NUM> is provided with a first limiting platform <NUM>, an outer surface of the rotating shaft <NUM> is provided with a second limiting platform <NUM>, the first limiting platform <NUM> and the second limiting platform <NUM> are located in a same circumferential direction, and when the rotating shaft <NUM> rotates in the rotating shaft through-hole <NUM> until the first limiting platform <NUM> comes into contact with the second limiting platform <NUM>, as shown in (b) in <FIG> and referring to (b) in <FIG>, the first slideway <NUM> and the second slideway <NUM> form a continuous slideway <NUM>-<NUM>. <NUM>' in (b) in <FIG> indicates a projection of the first limiting platform <NUM>, and <NUM>' indicates a projection of the second limiting platform <NUM>.

It should be noted that a cross-sectional view shown in (a) in <FIG> is a schematic diagram taken at positions of the first slideway <NUM> and the second slideway <NUM>, and a cross-sectional view shown in (b) in <FIG> is a schematic diagram not taken at the positions of the first slideway <NUM> and the second slideway <NUM>.

As shown in <FIG>, the second limiting platform <NUM> and the first limiting platform <NUM> are located in a same circumferential direction, so that when the rotating shaft <NUM> rotates in the rotating shaft through-hole <NUM>, the second limiting platform <NUM> can come into contact with the first limiting platform <NUM>, and the first limiting platform <NUM> prevents the rotating shaft <NUM> from rotating in the original direction. For example, as shown in (b) in <FIG> and referring to (b) in <FIG>, the rotating shaft <NUM> is prevented from rotating in the first direction (for example, the clockwise direction).

To make the rotating shaft <NUM> rotate to a position in a second direction (for example, a counterclockwise direction) and then no longer continue rotating in the second direction, correspondingly, still referring to <FIG>, the inner wall of the rotating shaft through-hole <NUM> is provided with a third limiting platform <NUM>, the outer surface of the rotating shaft <NUM> is provided with a fourth limiting platform <NUM>, and the fourth limiting platform <NUM> and the third limiting platform <NUM> are located in a same circumferential direction. As shown in <FIG> and referring to <FIG>, when the rotating shaft <NUM> rotates in the rotating shaft through-hole <NUM> until the third limiting platform <NUM> comes into contact with the fourth limiting platform <NUM>, the rotating shaft <NUM> stops rotating in the original rotation direction. For example, as shown in <FIG>, the rotating shaft <NUM> is prevented from rotating in the second direction (for example, the counterclockwise direction). A reference numeral <NUM>' in <FIG> indicates a projection of the fourth limiting platform <NUM>.

As shown in <FIG>, the fourth limiting platform <NUM> and the third limiting platform <NUM> are located in a same circumferential direction, so that when the rotating shaft <NUM> rotates in the rotating shaft through-hole <NUM>, the fourth limiting platform <NUM> can come into contact with the third limiting platform <NUM>, and the third limiting platform <NUM> prevents the rotating shaft <NUM> from rotating in the original direction. For example, as shown in <FIG>, the rotating shaft <NUM> is prevented from rotating in the counterclockwise direction.

The contact between the third limiting platform <NUM> and the fourth limiting platform <NUM> shown in <FIG> can restrain the rotating shaft <NUM> from rotating in the second direction. An implementation manner of restraining the rotating shaft <NUM> from rotating in the second direction further includes other manners. For example, referring back to <FIG>, a possible manner may be that when two swing arms <NUM> located on different sides of the base <NUM> collide, the rotating shaft <NUM> can also be restrained from rotating in the second direction. For another example, another possible manner may be that as shown in (c) in <FIG>, as introduced below, a third limiting platform <NUM> comes into contact with a locking portion <NUM> of a swing arm <NUM> to restrain a rotating shaft <NUM> from rotating in a second direction. This solution will be described below when the swing arm <NUM> is described.

The foregoing limiting platforms, such as the first limiting platform <NUM>, the second limiting platform <NUM>, the third limiting platform <NUM>, and the fourth limiting platform <NUM>, are formed in a similar manner, and there are a plurality of formation manners.

For example, as shown in <FIG>, the first limiting platform <NUM> and the third limiting platform <NUM> may be formed in such a manner that a cross-sectional figure of the rotating shaft through-hole <NUM> is of a closed structure formed by two arcs, and radii of the two arcs are different. Then two steps are formed at an intersection of the two arcs, one step may be used as the first limiting platform <NUM>, and the other step may be used as the third limiting platform <NUM>. Alternatively, the inner wall of the rotating shaft through-hole <NUM> is provided with a strip-shaped protrusion structure in the circumference direction. One end of the strip-shaped protrusion structure may be used as the first limiting platform <NUM>, and the other end thereof may be used as the third limiting platform <NUM>.

Similarly, as shown in <FIG>, the second limiting platform <NUM> and the fourth limiting platform <NUM> may be formed in such a manner that a cross-sectional figure of the rotating shaft <NUM> is of a closed structure formed by two arcs, and radii of the two arcs are different. Then two steps are formed at an intersection of the two arcs, one step may be used as the second limiting platform <NUM>, and the other step may be used as the fourth limiting platform <NUM>.

Certainly, as for a specific forming manner, in addition to being formed in the foregoing manner, the first limiting platform <NUM>, the second limiting platform <NUM>, the third limiting platform <NUM>, and the fourth limiting platform <NUM> may alternatively be formed in the following manner: The first limiting platform <NUM> and the third limiting platform <NUM> each may be of a protrusion structure located on the inner wall surface of the rotating shaft through-hole <NUM> and protruding toward an axis; and the second limiting platform <NUM> and the fourth limiting platform <NUM> each may be of a protrusion structure located on the outer surface of the rotating shaft <NUM> and protruding away from the axis.

In this embodiment, a specific manner of forming the first limiting platform <NUM>, the second limiting platform <NUM>, the third limiting platform <NUM>, and the fourth limiting platform <NUM> is not limited, provided that the following is met: The first limiting platform <NUM> and the second limiting platform <NUM> are located in a same circumferential direction, so that the first limiting platform <NUM> and the second limiting platform <NUM> can be in contact with each other, and when the first limiting platform <NUM> and the second limiting platform <NUM> are in contact with each other, the first slideway <NUM> and the second slideway <NUM> are connected to form a continuous slideway <NUM>-<NUM>; and the third limiting platform <NUM> and the fourth limiting platform <NUM> are located in a same circumferential direction, so that the third limiting platform <NUM> and the fourth limiting platform <NUM> can be in contact with each other.

As shown in <FIG>, an outer wall of the rotating shaft <NUM> is provided with a second limiting platform <NUM> and a fourth limiting platform <NUM>. Correspondingly, as shown in <FIG>, a rotating shaft <NUM> may include an assembly column <NUM> and two support columns <NUM>. The assembly column <NUM> is located between the two support columns <NUM>, and an axis of the assembly column <NUM> and axes of the two support columns <NUM> are collinear. The second slideway <NUM>, the second limiting platform <NUM>, and the fourth limiting platform <NUM> are all arranged on the assembly column <NUM>.

To match the structure of the rotating shaft <NUM>, correspondingly, as shown in <FIG>, the rotating shaft through-hole <NUM> includes a first-section through-hole <NUM> and two second-section through-holes <NUM>. The first-section through-hole <NUM> is located between the two second-section through-holes <NUM>, and an axis of the first-section through-hole <NUM> and axes of the second-section through-holes <NUM> are collinear. The first-section through-hole <NUM> matches the assembly column <NUM>, and the second-section through-holes <NUM> match the support columns <NUM>. The first limiting platform <NUM> and the third limiting platform <NUM> are arranged on an inner wall of the first-section through-hole <NUM>.

In this way, after the rotating shaft <NUM> is installed in the rotating shaft through-hole <NUM> of the base <NUM>, the assembly column <NUM> is located in the first-section through-hole <NUM>, and the support columns <NUM> are located in the second-section through-holes <NUM>.

In this way, the support columns <NUM> with circular cross-sections are located in the second-section through-holes <NUM> with circular cross-sections, so that the rotating shaft <NUM> can smoothly rotate in the rotating shaft through-hole <NUM>.

As described above, the rotating assembly further includes a swing arm <NUM>. Referring to <FIG> and <FIG>, a part of the swing arm <NUM> is installed in the base <NUM>, and the other part is located outside the base <NUM> and is used to connect a body. Correspondingly, as shown in <FIG>, the swing arm <NUM> includes a body connecting portion <NUM>, a sliding portion <NUM>, and a locking portion <NUM>. As shown in <FIG>, the body connecting portion <NUM>, the sliding portion <NUM>, and the locking portion <NUM> are sequentially connected, and the locking portion <NUM> is located on a side portion of the sliding portion <NUM> and far away from an end portion of the body connecting portion <NUM>.

The body connecting portion <NUM> is configured to connect a body, and the sliding portion <NUM> and the locking portion <NUM> are configured to connect the base <NUM>. For example, the sliding portion <NUM> and the locking portion <NUM> are configured to be inserted into the continuous slideway <NUM>-<NUM> of the base <NUM> and slide back and forth in the continuous slideway <NUM>-<NUM>.

It should be noted that the body connecting portion <NUM> shown in <FIG> is a partial structure, and for an overall structure of the body connecting portion <NUM>, reference may be made to <FIG>.

To enable the sliding portion <NUM> and the locking portion <NUM> to slide back and forth in the continuous slideway <NUM>-<NUM>, correspondingly, as shown in <FIG>, the sliding portion <NUM> and the locking portion <NUM> are each of an arc-shaped structure and match the continuous slideway <NUM>-<NUM>. For example, a radius of a circle where the sliding portion <NUM> is located is equal to a radius of a circle where the locking portion <NUM> is located, and slightly less than a radius of a circle where the continuous slideway <NUM>-<NUM> is located. In this way, as shown in <FIG>, the sliding portion <NUM> and the locking portion <NUM> can be located in the continuous slideway <NUM>-<NUM>, and can slide in the continuous slideway <NUM>-<NUM>.

As shown in <FIG>, an arc length of the locking portion <NUM> is less than or slightly less than an arc length of the second slideway <NUM>. In this way, as shown in (b) in <FIG>, when the locking portion <NUM> is completely located in the second slideway <NUM> and the swing arm <NUM> rotates in the second direction relative to the base <NUM>, as shown in (b) and (c) in <FIG>, the locking portion <NUM> can drive the rotating shaft <NUM> to rotate in the rotating shaft through-hole <NUM>.

Based on the foregoing description, as shown in <FIG>, during rotation of the swing arm <NUM> in the second direction (for example, the counterclockwise direction), the rotation process of the swing arm <NUM> is as follows.

A state shown in (a) in <FIG> is an initial state in which the swing arm <NUM> rotates in the second direction, and a state shown in (c) in <FIG> is a final state in which the swing arm <NUM> rotates in the second direction.

As shown in (a) in <FIG>, an end portion that is of the locking portion <NUM> and that is far away from the body connecting portion <NUM> is in contact with an end portion that is of the continuous slideway <NUM>-<NUM> and that is far away from the rotating shaft through-hole <NUM>. When the swing arm <NUM> rotates in the second direction, the sliding portion <NUM> and the locking portion <NUM> of the swing arm <NUM> slide in the continuous slideway <NUM>-<NUM>. As shown in (b) in <FIG>, when the end portion that is of the locking portion <NUM> of the swing arm <NUM> and that is close to the body connecting portion <NUM> is in contact with the end portion that is of the rotating shaft through-hole <NUM> and that is at the rotating shaft through-hole <NUM>, the locking portion <NUM> is completely located in the second slideway <NUM>. In this case, as shown in (b) in <FIG>, the swing arm <NUM> has already slid in the continuous slideway <NUM>-<NUM> to the end portion position of the continuous slideway <NUM>-<NUM>, and cannot continue to slide in the continuous slideway <NUM>-<NUM> in the second direction.

When the swing arm <NUM> continues rotating in the second direction, the locking portion <NUM> drives the rotating shaft <NUM> to rotate in the rotating shaft through-hole <NUM>. As shown in (c) in <FIG>, when rotating until the third limiting platform <NUM> comes into contact with the locking portion <NUM>, the rotating shaft <NUM> stops rotating in the second direction, and the swing arm <NUM> also stops rotating in the second direction.

As described above, the contact between the third limiting platform <NUM> and the locking portion <NUM> restrains the rotating shaft <NUM> from rotating in the rotating shaft through-hole <NUM> in the counterclockwise direction.

As described above, restraining the rotating shaft <NUM> from rotating in the rotating shaft through-hole <NUM> in the counterclockwise direction may also be implemented by the contact between the third limiting platform <NUM> and the fourth limiting platform <NUM>, as shown in <FIG> and <FIG>.

It can be learned that when the swing arm <NUM> rotates in the second direction to a state shown in (c) in <FIG>, the third limiting platform <NUM> can be configured to restrain the swing arm <NUM> from rotating in the second direction. For example, as shown in <FIG> and <FIG>, the third limiting platform <NUM> may restrain the swing arm <NUM> from rotating in the second direction by cooperating with the fourth limiting platform <NUM>. For another example, as shown in (c) in <FIG>, the third limiting platform <NUM> can also restrain the swing arm <NUM> from rotating in the second direction by cooperating with the locking portion <NUM> of the swing arm <NUM>.

When the third limiting platform <NUM> cooperates with the fourth limiting platform <NUM> to implement limiting, an arc length distance d1 between the third limiting platform <NUM> and the fourth limiting platform <NUM> (see (a) in <FIG>) needs to be greater than or equal to an arc length distance d2 between the third limiting platform <NUM> and the locking portion <NUM> of the swing arm <NUM> (see (b) in <FIG>). In this way, during rotation of the swing arm <NUM> in the second direction, the third limiting platform <NUM> first comes into contact with the fourth limiting platform <NUM>, to restrain the rotating shaft <NUM> from rotating in the original direction.

Similarly, when the third limiting platform <NUM> cooperates with the locking portion <NUM> to implement limiting, the arc length distance d2 between the third limiting platform <NUM> and the locking portion <NUM> of the swing arm <NUM> (see (b) in <FIG>) needs to be greater than or equal to the arc length distance d1 between the third limiting platform <NUM> and the fourth limiting platform <NUM> (see (a) in <FIG>). In this way, during rotation of the swing arm <NUM> in the second direction, the third limiting platform <NUM> first comes into contact with the locking portion <NUM>, to restrain the rotating shaft <NUM> from rotating in the original direction.

The above describes the effect of restraining the rotating shaft <NUM> from rotating in the original direction by using the third limiting platform <NUM>. In some examples, limiting may also be implemented without the third limiting platform <NUM>. For example, as shown in <FIG>, when the swing arm <NUM> on the left side of the base <NUM> and the swing arm <NUM> on the right side of the base <NUM> rotate to come into contact with each other, the rotating shaft <NUM> can also be restrained from rotating in the rotating shaft through-hole <NUM> in the second direction.

The above describes the process of rotation of the swing arm <NUM> in the second direction. The swing arm <NUM> may also rotate in the first direction opposite to the second direction, to make the swing arm <NUM> rotate back and forth. Reverse movement, that is, the process of rotation of the swing arm <NUM> in the first direction, will be described below.

A state shown in (c) in <FIG> is an initial state in which the swing arm <NUM> rotates in the first direction, and a state shown in (a) in <FIG> is a final state in which the swing arm <NUM> rotates in the first direction.

As shown in (c) and (b) in <FIG>, when the swing arm <NUM> drives the rotating shaft <NUM> to rotate in the first direction until the first limiting platform <NUM> and the second limiting platform <NUM> come into contact with each other (see <FIG>), the rotating shaft <NUM> stops rotating in the first direction, and in this case, the first slideway <NUM> and the second slideway <NUM> are connected to form a continuous slideway <NUM>-<NUM>.

As shown in (b) in <FIG>, when the swing arm <NUM> continues rotating in the first direction, the sliding portion <NUM> and the locking portion <NUM> of the swing arm <NUM> slide in the continuous slideway <NUM>-<NUM>. As shown in (a) in <FIG>, when the locking portion <NUM> slides in the continuous slideway <NUM>-<NUM> to an end portion of the continuous slideway <NUM>-<NUM>, that is, when the end portion that is of the locking portion <NUM> and that is far away from the body connecting portion <NUM> comes into contact with the end portion that is of the first slideway <NUM> and that is far away from the second slideway <NUM>, the swing arm <NUM> has already slid in the continuous slideway <NUM>-<NUM> to the end portion position of the continuous slideway <NUM>-<NUM> and cannot continue sliding in the continuous slideway <NUM>-<NUM>.

It can be learned from the rotation process of the swing arm <NUM> in <FIG> that during rotation of the swing arm <NUM> relative to the base <NUM>, two stages are included. As shown in (a) and (b) in <FIG>, in one stage, the sliding portion <NUM> and the locking portion <NUM> of the swing arm <NUM> slide in the continuous slideway <NUM>-<NUM>; and as shown in (b) and (c) in <FIG>, in the other stage, the locking portion <NUM> of the swing arm <NUM> drives the rotating shaft <NUM> to rotate in the rotating shaft through-hole <NUM>.

During sliding of the swing arm <NUM> slides in the continuous slideway <NUM>-<NUM>, a rotation angle range of rotation of the swing arm <NUM> relative to the base <NUM> may be denoted as a first angle range; and when the swing arm <NUM> drives the rotating shaft <NUM> to rotate, a rotation angle range of rotation of the swing arm <NUM> relative to the base <NUM> may be denoted as a second angle range.

The first angle range and the second angle range are two consecutive angle ranges. For example, a maximum angle of the first angle range is equal to a minimum angle of the second angle range. For example, the first angle range may be approximately <NUM>° to <NUM>°, and the second angle range may be approximately <NUM>° to <NUM>°. For example, as shown in (a) in <FIG>, an included angle between the swing arm <NUM> and the base <NUM> is approximately <NUM>°; as shown in (b) in <FIG>, an included angle between the swing arm <NUM> and the base <NUM> is approximately <NUM>°; and as shown in (c) in <FIG>, an included angle between the swing arm <NUM> and the base <NUM> is approximately <NUM>°.

Certainly, the first angle range and the second angle range may alternatively be flexibly divided based on an actual situation. An example in which the swing arm <NUM> rotates in an angle range between <NUM>° and <NUM>° may be provided in the description.

Then, based on the foregoing description, limiting in cases where the swing arm <NUM> rotates to the minimum angle of the first angle range, the minimum angle of the first angle range, the minimum angle of the second angle range, and the maximum angle of the second angle range may be implemented in the following manner.

As shown in (a) and (b) in <FIG>, during rotation of the swing arm <NUM> from the maximum angle of the first angle range to the minimum angle of the first angle range, when the rotation angle of the swing arm <NUM> reaches the minimum angle of the first angle range through the contact between the end portion that is of the locking portion <NUM> and that is far away from the body connecting portion <NUM> and the end portion that is of the first slideway <NUM> and that is far away from the second slideway <NUM>, the swing arm <NUM> no longer continues sliding in the original direction.

As shown in (a) and (b) in <FIG>, during rotation of the swing arm <NUM> from the minimum angle of the first angle range to the maximum angle of the first angle range, when the rotation angle of the swing arm <NUM> reaches the maximum angle of the first angle range through the contact between the end portion that is of the locking portion <NUM> that is close to the body connecting portion <NUM> and the end portion that is of the second slideway <NUM> and that is far away from the first slideway <NUM>, the swing arm <NUM> no longer continues sliding in the original direction, so that the swing arm <NUM> rotates in the second angle range, and the swing arm <NUM> drives the rotating shaft <NUM> to rotate.

As shown in (b) and (c) in <FIG>, during rotation of the swing arm <NUM> from the maximum angle of the second angle range to the minimum angle of the second angle range, when the rotation angle of the swing arm <NUM> reaches the minimum angle of the second angle range through the contact between the first limiting platform <NUM> and the second limiting platform <NUM>, the swing arm <NUM> no longer drives the rotating shaft <NUM> to rotate in the original direction, and the first slideway <NUM> and the second slideway <NUM> are just connected to form a continuous slideway <NUM>-<NUM>, so that the swing arm <NUM> rotates in the first angle range, and the swing arm <NUM> slides in the continuous slideway <NUM>-<NUM>.

As shown in (b) and (c) in <FIG>, during rotation of the swing arm <NUM> from the minimum angle of the second angle range to the maximum angle of the second angle range, in one manner, as shown in (c) in <FIG>, through the contact between the third limiting platform <NUM> and the locking portion <NUM>, the swing arm <NUM> may no longer continue driving the rotating shaft <NUM> to rotate in the original direction; in another manner, as shown in <FIG>, through the contact between the third limiting platform <NUM> and the fourth limiting platform <NUM>, the swing arm <NUM> may no longer continue driving the rotating shaft <NUM> to rotate in the original direction; and in another manner, as shown in <FIG>, through the collision between two swing arms <NUM> located on different sides of the base <NUM>, the swing arms <NUM> may no longer continue driving the rotating shaft <NUM> to rotate in the original direction.

Still referring to (a) and (b) in <FIG>, during sliding of the swing arm <NUM> in the continuous slideway <NUM>-<NUM>, that is, during rotation of the swing arm <NUM> in the first angle range relative to the base <NUM>, the swing arm <NUM> moves circularly relative to the base <NUM>, and an axis of this circular movement is a center of a circle where the continuous slideway <NUM>-<NUM> is located. The center of the circle is also a center of a circle where the first slideway <NUM> is located, and this axis may be referred to as a first axis O1. During the circular movement of the swing arm <NUM> around the first axis O1, the rotation radius of the swing arm <NUM> is denoted as R.

As shown in (b) and (c) in <FIG>, when the swing arm <NUM> drives the rotating shaft <NUM> to rotate in the rotating shaft through-hole <NUM>, that is, during rotation of the swing arm <NUM> in the second angle range relative to the base <NUM>, the swing arm <NUM> also moves circularly relative to the base <NUM>, an axis of this circular movement is a rotation center of the rotating shaft <NUM>, and the axis may be referred to as a second axis O2. During the circular movement of the swing arm <NUM> around the first axis OA1, the rotation radius of the swing arm <NUM> is denoted as r.

The rotation radius R of the swing arm <NUM> in the first angle range is greater than the rotation radius r of the swing arm <NUM> in the second angle range.

(a) in <FIG> is a schematic diagram of a track of a swing arm <NUM> when in existing technologies, during rotation of the swing arm <NUM> from a minimum angle of a first angle range to a maximum angle of a second angle range relative to a base <NUM>, the swing arm <NUM> always rotates around an axis O0 based on a rotation radius R. A length of the track may be denoted as S2.

(b) in <FIG> is a schematic diagram of a track of the swing arm <NUM> when in this application, during rotation of the swing arm <NUM> from the minimum angle of the first angle range to the maximum angle of the second angle range relative to the base <NUM>, the swing arm <NUM> first rotates around a first axis O1 based on the rotation radius R and then rotates around a second axis O2 based on a rotation radius r. A length of the track may be denoted as S1.

As shown in (a) and (b) in <FIG>, during rotation of the swing arm <NUM> of this application and the swing arm <NUM> of existing technologies at a same angle relative to the base <NUM>, the track length S1 of the entire process when the swing arm <NUM> of this application first rotates around the first axis O1 with the radius R and then rotates around the second axis O2 with the radius r is less than the track length S2 of the entire process when the swing arm <NUM> of existing technologies always rotates around the axis O0 with the radius R.

However, when the length of the movement track of the swing arm <NUM> in the rotating assembly is small, the size of the rotating assembly also becomes small. For example, the length of the rotating assembly is reduced by Δl and a thickness is reduced by Δh. Then, when the rotating assembly is applied to a foldable terminal, an occupied space in the foldable terminal can be reduced.

In <FIG>, h represents a thickness of the rotating assembly, Δh represents a difference between a thickness of a rotating assembly of existing technologies as an example in (a) and a thickness of a rotating assembly of this solution as an example in (b), and Δl represents a difference between a length of the rotating assembly of existing technologies as an example in (a) and a length of the rotating assembly of this solution as an example in (b).

It should be noted that, because during folding of the foldable terminal, a screen is subjected to a relatively large acting force in an initial folding stage and is easily damaged, a relatively large rotation radius is needed, and the screen is subjected to a reduced acting force in a subsequent stage, so that the rotation radius may be reduced.

It can be learned that when the rotating assembly is applied to a foldable terminal, the swing arm <NUM> of the rotating assembly can switch a rotation axis and the rotation radius during the entire rotation, and the rotation radius in the first angle range is greater than that in the second angle range. A large rotation radius in the first angle range makes the swing arm <NUM> rotate relatively gently, which can reduce a pulling force on the screen from flattening to folding, thereby protecting the screen. A small rotation radius in the second angle range can reduce a size of the rotating assembly.

In addition, the reduction of the size of the rotating assembly can reduce the space in the foldable mechanism that is occupied by the rotating assembly, can reduce the size of the foldable mechanism, and reduce the space in the foldable terminal that is occupied by the foldable mechanism, thereby reducing the size of the foldable terminal, so that the size of the foldable terminal can be minimized on the basis of meeting folding requirements.

It should be noted that the rotation radius R of the swing arm <NUM> in the first angle range and the rotation radius r thereof in the second angle range are both related to a bending radius of the screen of the foldable terminal to which the rotating assembly is applied. A technician may select the rotation radius R of the swing arm <NUM> in the first angle range and the rotation radius r thereof in the second angle range based on an actual bending radius of the screen of the foldable terminal.

For specific shapes of the base <NUM>, the rotating shaft <NUM>, and the swing arm <NUM>, in actual application of the rotating assembly, the technical may flexibly design specific shapes of the base <NUM>, the rotating shaft <NUM>, and the swing arm <NUM> based on machining requirements and assembly requirements.

For example, as shown in <FIG>, the base <NUM> has a notch in an axial direction of the rotating shaft through-hole <NUM>, that is, the base <NUM> has a notch in a y-axis direction, and the overall base <NUM> is I-shaped. For another example, as shown in <FIG>, the base <NUM> may also be I-shaped for a rotating assembly including one swing arm <NUM>. In this way, each rotating shaft through-hole <NUM> is divided into two parts in the y-axis direction, so that the rotating shaft <NUM> is easily assembled in the rotating shaft through-hole <NUM> during assembly. In assembly, the base <NUM> may be split in the Y-axis direction, and after the rotating shaft <NUM> and the swing arm <NUM> are assembled, the two parts split in the y-axis direction are fixedly connected to each other.

In this embodiment, a specific shape of the base <NUM> is not limited, provided that the base <NUM> has the following structure: a rotating shaft through-hole <NUM> and a first slideway <NUM>, an inner wall of the rotating shaft through-hole <NUM> is provided with a first limiting platform <NUM> and a third limiting platform <NUM>, the rotating shaft through-hole <NUM> communicates with an end of the first slideway <NUM>, and an axis of the rotating shaft through-hole <NUM> is parallel to an axis of the first slideway <NUM>.

For another example, for a specific shape of the rotating shaft <NUM>, as shown in <FIG>, the rotating shaft <NUM> includes an assembly column <NUM> and two support columns <NUM> in an axial direction, that is, in the y-axis direction, and a second slideway <NUM>, a second limiting platform <NUM>, and a fourth limiting platform <NUM> are all arranged on the assembly column <NUM>.

In this embodiment, a specific shape of the rotating shaft <NUM> is not limited, provided that the rotating shaft <NUM> has the following structure: the second slideway <NUM> running through the inside of the rotating shaft <NUM>, and the second limiting platform <NUM> and the fourth limiting platform <NUM> located on the outer surface of the rotating shaft <NUM>, the second slideway <NUM> corresponds to the first slideway <NUM>, the second limiting platform <NUM> matches the first limiting platform <NUM>, and the fourth limiting platform <NUM> matches the third limiting platform <NUM>.

As shown in <FIG>, the rotating shaft <NUM> has a notch in an axial direction, so that a protrusion structure of the swing arm <NUM> can fill the notch position of the base <NUM> in the axial direction.

For another example, a specific shape of the swing arm <NUM> is not limited in this embodiment, provided that the swing arm <NUM> has the following structure: a sliding portion <NUM> and a locking portion <NUM> that match a continuous slideway <NUM>-<NUM>. The locking portion <NUM> is located on an end portion of the sliding portion <NUM> and on one or two sides in the y-axis direction, so that the swing arm <NUM> can slide in the continuous slideway <NUM>-<NUM>, and the locking portion <NUM> can limit the sliding in the continuous slideway <NUM>-<NUM>.

As shown in <FIG>, a surface of the sliding portion <NUM> of the swing arm <NUM> has a protrusion structure, so that the protrusion structure on the surface of the swing arm <NUM> can fill the notch position of the base <NUM> after the swing arm <NUM> passes through the rotating shaft <NUM> and is installed in the base <NUM>. If the base <NUM> has no notch in the y-axis direction, the rotating shaft <NUM> may have no notch in the y-axis direction, and the surface of the swing arm <NUM> may have no protrusion structure.

In this embodiment of this application, when rotating in a first angle range, a swing arm of the rotating assembly slides in a continuous slideway, and moves, relative to a base, circularly around a center of a circle where a first slideway is located; and when rotating in a second angle range, the swing arm drives a rotating shaft to rotate, and moves circularly around an axis of the rotating shaft relative to the base, and a rotation radius of the swing arm in the first angle range is greater than that in the second angle range. It can be learned that the swing arm of the rotating assembly can switch a rotation axis and the rotation radius during the entire rotation, and the rotation radius of the swing arm in the first angle range is large, so that the swing arm rotates relatively gently in the first angle range, which can reduce a pulling force on the screen from flattening to bending, thereby protecting the screen. The swing arm has a small rotation radius in the second angle range, which can reduce a length of the rotating assembly, and then reduce a space in the foldable mechanism that is occupied by the rotating assembly, and reduce a size of the foldable mechanism, thereby reducing a space in the foldable terminal that is occupied by the foldable mechanism.

An embodiment of this application further provides a foldable mechanism. <FIG> and <FIG> are schematic diagrams of the foldable mechanism. The foldable mechanism not only includes the foregoing rotating assembly <NUM> and a door plate <NUM>, but also includes a fastener <NUM>, a limiting pin <NUM>, a connecting plate <NUM>, and a connecting shaft <NUM>. A connection relationship between these components may be as follows.

As shown in <FIG> and referring to <FIG>, during assembly of the foldable mechanism, the fastener <NUM> may be fixedly connected to an end portion of the base <NUM> of the rotating assembly <NUM>. Then the rotating assembly <NUM> may be assembled. After the rotating assembly <NUM> is assembled, the door plate <NUM> may be installed on a side of the fastener <NUM> by using the limiting pin <NUM>, the connecting plate <NUM>, and the connecting shaft <NUM>. For example, the limiting pin <NUM> is installed on a surface of the door plate <NUM>, and a distance is reserved between the limiting pin <NUM> and the door plate <NUM>. One side of the connecting plate <NUM> is rotatably installed on a side of the fastener <NUM> by using the connecting shaft <NUM>, and the other side of the connecting plate <NUM> is inserted between the limiting pin <NUM> and the door plate <NUM>. The connecting plate <NUM> can slide between the limiting pin <NUM> and the door plate <NUM> in a sliding direction perpendicular to a direction of the connecting shaft <NUM>.

The limiting pin <NUM> may be replaced by a limiting plate, the limiting plate is installed on the surface of the door plate <NUM>, and a side of the connecting plate <NUM> far from the base <NUM> is inserted between the limiting plate and the door plate <NUM>, and can slide left and right between the limiting plate and the door plate <NUM>.

In this way, when the swing arm <NUM> is switched from driving the rotating shaft <NUM> to rotate to sliding in the continuous slideway <NUM>-<NUM>, the rotation radius of the swing arm <NUM> becomes larger, and the connecting plate <NUM> slides in a direction away from the door plate <NUM> to increase the rotation radius of the door plate <NUM>, so as to adapt to the increase of the rotation radius of the swing arm <NUM>. When the swing arm <NUM> is switched from sliding in the continuous slideway <NUM>-<NUM> to driving the rotating shaft <NUM> to rotate, the rotation radius of the swing arm <NUM> becomes smaller, and the connecting plate <NUM> slides in a direction close to the door plate <NUM> to reduce the rotation radius of the door plate <NUM>, so as to adapt to the reduction of the rotation radius of the swing arm <NUM>.

It can be learned that during rotation of the swing arm <NUM>, the door plate <NUM> rotates around the connecting shaft <NUM> under the driving of the connecting plate <NUM>, to rotate with the swing arm <NUM>. When the swing arm <NUM> switches the rotation radius, the connecting plate <NUM> slides leftward or rightward relative to the door plate <NUM> to adjust the rotation radius of the door plate <NUM> to adapt to a change in the rotation radius of the swing arm <NUM>, so that the door plate <NUM> does not interfere with the movement of the swing arm <NUM> during the rotation of the swing arm <NUM>.

In actual application of the foldable mechanism, to enable the swing arm <NUM> to be stabilized at a position after rotating to the position, correspondingly, the foldable mechanism may further include a damping mechanism, the damping mechanism blocks the rotation of the swing arm <NUM>. A user needs to overcome an acting force exerted by the damping mechanism on the swing arm <NUM> before operating the swing arm <NUM> for rotating.

The damping mechanism may be a pneumatic damping mechanism, a hydraulic damping mechanism, a spring damping mechanism, or the like. A specific implementation manner of the damping mechanism is not limited in this embodiment.

In actual application of the foldable mechanism, if the foldable mechanism includes two or more swing arms <NUM>, the foldable mechanism may further include a synchronization mechanism, so that a plurality of swing arms <NUM> can rotate synchronously.

In this embodiment of this application, when rotating in a first angle range, a swing arm of the rotating assembly slides in a continuous slideway, and moves, relative to a base, circularly around a center of a circle where a first slideway is located; and when rotating in a second angle range, the swing arm drives a rotating shaft to rotate, and moves circularly around an axis of the rotating shaft relative to the base, and a rotation radius of the swing arm in the first angle range is greater than that in the second angle range. It can be learned that when the rotating assembly is applied to a foldable terminal, the swing arm of the rotating assembly can switch a rotation axis and the rotation radius during the entire rotation, and the rotation radius of the swing arm in the first angle range is large, so that the swing arm rotates relatively gently in the first angle range, which can reduce a pulling force on the screen from flattening to bending, thereby protecting the screen. The swing arm has a small rotation radius in the second angle range, which can reduce a length of the rotating assembly, and then reduce a space in the foldable mechanism that is occupied by the rotating assembly, thereby facilitating miniaturization of the foldable mechanism. Once the size of the foldable mechanism is reduced, a space in the foldable terminal that is occupied by the foldable mechanism can be reduced.

An embodiment of this application further provides a foldable terminal. As shown in <FIG>, the foldable terminal includes a first body <NUM>, a second body <NUM>, a screen <NUM>, and the foregoing foldable mechanism <NUM>. The foldable mechanism <NUM> is connected between the first body <NUM> and the second body <NUM>. The screen <NUM> is located on surfaces of the first body <NUM>, the second body <NUM>, and the foldable mechanism <NUM>, and is fastened to both the first body <NUM> and the second body <NUM>.

The foldable mechanism of the foldable terminal includes the foregoing rotating assembly. When rotating in a first angle range, a swing arm of the rotating assembly slides in a continuous slideway, and moves, relative to a base, circularly around a center of a circle where a first slideway is located; and when rotating in a second angle range, the swing arm drives a rotating shaft to rotate, and moves circularly around an axis of the rotating shaft relative to the base, and a rotation radius of the swing arm in the first angle range is greater than that in the second angle range. It can be learned that the swing arm of the rotating assembly can switch a rotation axis and the rotation radius during the entire rotation, and the rotation radius of the swing arm in the first angle range is large, so that the swing arm rotates relatively gently in the first angle range, which can reduce a pulling force on the screen from flattening to bending, thereby protecting the screen. The swing arm has a small rotation radius in the second angle range, which can reduce a length of the rotating assembly, and then reduce a space in the foldable mechanism that is occupied by the rotating assembly, and reduce a size of the foldable mechanism, thereby reducing a space in the foldable terminal that is occupied by the foldable mechanism. Once the space in the foldable terminal that is occupied by the foldable mechanism is reduced, the size of the foldable terminal can be further reduced, so that the size of the foldable terminal can be minimized on the basis of meeting folding requirements.

Claim 1:
A rotating assembly, wherein the rotating assembly comprises a base (<NUM>), a rotating shaft (<NUM>), and a swing arm (<NUM>), wherein
the base (<NUM>) is provided with a rotating shaft through-hole (<NUM>) and an arc-shaped first slideway (<NUM>), an end of the first slideway (<NUM>) communicates with the rotating shaft through-hole (<NUM>), an axis of the first slideway (<NUM>) is parallel to an axis of the rotating shaft through-hole (<NUM>), the rotating shaft (<NUM>) is provided with an arc-shaped second slideway (<NUM>), an axis of the rotating shaft (<NUM>) is parallel to an axis of the second slideway (<NUM>), the second slideway (<NUM>) runs through the rotating shaft (<NUM>), and a radius of the second slideway (<NUM>) is equal to that of the first slideway (<NUM>);
the rotating shaft (<NUM>) is located in the rotating shaft through-hole (<NUM>), and the first slideway (<NUM>) and the second slideway (<NUM>) can be connected to each other to form a continuous slideway (<NUM>-<NUM>), and the swing arm (<NUM>) is located in the continuous slideway (<NUM>-<NUM>) and is slidable in the continuous slideway (<NUM>-<NUM>); and
the swing arm (<NUM>) is configured to slide in the continuous slideway (<NUM>-<NUM>) when the swing arm (<NUM>) rotates in a first angle range, and drive the rotating shaft (<NUM>) to rotate when the swing arm (<NUM>) rotates in a second angle range, wherein a rotation radius of the swing arm (<NUM>) in the first angle range is greater than that in the second angle range.