Patent Description:
Embodiments of this application relate to the field of terminal technologies, and in particular, to a hinge apparatus and an electronic device.

A display screen of an electronic device is configured to present image information to users. In some usage scenarios, users expect that the display screen of the electronic device can have a larger display area. Currently, the electronic device uses a single screen for display. A lager display area indicates a larger size of the electronic device, resulting in loss of portability of the electronic device.

With development of flexible display screen technologies, an electronic device may use a foldable structure to balance the size and display area of the electronic device. For example, two frames may rotate relative to each other about a hinge apparatus to be unfolded or folded. The two frames are covered by a flexible display screen. When the two frames are unfolded to a same plane, the flexible display screen is in an unfolded state and has a large display area. When the two frames are folded together, the flexible display screen is in a folded state, and a size of the electronic device is small. However, during unfolding or folding the electronic device, the frames have a problem of synchronization deviation in a rotating process, resulting in poor use experience with the electronic device.

Embodiments of this application provide a hinge apparatus and an electronic device, to facilitate improvement of use experience with the electronic device.

A first aspect of this application provides a hinge apparatus. The hinge apparatus includes a shaft cover, bases, and swing arm assemblies. The shaft cover includes accommodation recess parts. The bases are disposed in the accommodation recess parts. Each base includes relief spaces and first adapter parts. The first adapter parts face the relief spaces. The base includes a synchronous slider and a limiting guide track. The limiting guide track is connected to the shaft cover. The limiting guide track is disposed at a side that is of the synchronous slider and that faces away from the shaft cover. The synchronous slider is slidably connected to the limiting guide track. The swing arm assemblies each include swing arm bodies and second adapter parts. Each swing arm body includes a connection end and a free end. The connection end is close to the base. The free end is away from the base. At least part of the connection end is located in the relief space. The second adapter parts are connected to the connection ends. The second adapter parts are rotatably connected to the first adapter parts. The second adapter parts are connected to the synchronous slider. The swing arm bodies rotate relative to the first adapter parts via the second adapter parts, to switch between a folded position and an unfolded position, and the second adapter parts synchronously drive the synchronous slider to move between a first position and a second position. In the hinge apparatus according to embodiments of this application, the shaft cover can provide a mounting base for the bases and the swing arm assemblies. The shaft cover can protect the bases and the swing arm assemblies. Each base includes a synchronous slider and a limiting guide track. The synchronous slider may slide relative to the limiting guide track. The limiting guide track may form a positional limitation to the synchronous slider. The base further includes relief spaces and first adapter parts. Part of each swing arm body of the swing arm assembly is located in the relief space, to facilitate increasing compactness of a structure of the hinge apparatus. The second adapter parts of the swing arm assemblies are rotatably connected to the first adapter parts of the bases. The second adapter parts are connected to the synchronous slider. When the swing arm bodies and the second adapter parts rotate relative to the first adapter parts, the second adapter parts synchronously drive the synchronous slider to move relative to the limiting guide track, so that synchronization of a flipping process of the swing arm bodies and a movement process of the synchronous slider can be achieved, and the synchronous slider can achieve synchronization of flipping movements of the swing arm bodies on two sides of the shaft cover, to ensure that the frames connected to the swing arm bodies can rotate synchronously, thereby facilitating improvement of convenience as well as experience and satisfaction during use of the electronic device.

In a possible implementation, the first adapter parts are arc slide ways. An axial direction of the first adapter part is the same as a movement direction of the synchronous slider. The first adapter parts are communicated with the relief spaces. The second adapter parts are arc structures. At least part of each second adapter part is located in the first adapter part. An axis of the first adapter part is coaxial with an axis of the second adapter part. A shape of the first adapter part matches a shape of the second adapter part.

In a possible implementation, each of two sides of the swing arm body is provided with the first adapter part and the second adapter part in the movement direction of the synchronous slider.

In a possible implementation, the synchronous slider includes first helical surfaces. The first helical surfaces are arranged corresponding to the first adapter parts. Each first helical surface is located at a side that is of the first adapter part and that faces away from the relief space. Each second adapter part includes a second helical surface. The first helical surfaces are in contact with the second helical surfaces. Helix directions of the first helical surfaces on the two sides of the swing arm body are identical, and helix directions of the second helical surfaces on the two sides of the swing arm body are identical. When the second adapter parts rotate relative to the first adapter parts, the first helical surfaces and the second helical surfaces slide relative to each other synchronously, to enable the second adapter parts to drive the synchronous slider to move.

In a possible implementation, the limiting guide track includes first arc surfaces. The synchronous slider includes second arc surfaces. Arc slide ways are formed between the first arc surfaces and the second arc surfaces. The second adapter parts include third arc surfaces and fourth arc surfaces. The first arc surfaces are in contact with the third arc surfaces. The second arc surfaces are in contact with the fourth arc surfaces. The first helical surfaces are connected to the second arc surfaces. The second helical surfaces connect the fourth arc surfaces to the second arc surfaces. In a possible implementation, the synchronous slider includes guide recesses. The guide recesses face the limiting guide track. The guide recesses are communicated with the first adapter parts. The limiting guide track includes guide parts. The guide parts are located in the guide recesses. Shapes of the guide parts match shapes of the guide recesses.

In a possible embodiment, an inner wall of each guide recess is arc-shaped. A surface that is of each guide part and that faces the guide recess is arc-shaped. An axis of the guide recess is coaxial with an axis of the guide part.

In a possible implementation, the limiting guide track includes two limiting guide members. The two limiting guide members are spaced apart in the movement direction of the synchronous slider to form a first relief part between the two limiting guide members. The synchronous slider includes two end connection parts and an intermediate connection part. The two end connection parts are spaced apart in the movement direction of the synchronous slider. The intermediate connection part connects the two end connection parts. The synchronous slider includes second relief parts located at two sides of the intermediate connection part. The first relief part and the second relief parts form the relief spaces. The end connection parts are slidably connected to the corresponding limiting guide members. The first adapter parts are disposed between the end connection parts and the limiting guide members.

In a possible implementation, each limiting guide member includes a fixed part and two connecting support legs. The fixed part connects the two connecting support legs. The fixed part is connected to the shaft cover. The end connection parts are slidably connected to the corresponding connecting support legs. The first adapter parts are disposed between the end connection parts and the connecting support legs.

In a possible implementation, the shaft cover includes a bottom plate, side plates, and support bosses. The bottom plate and the side plates form the accommodation recess parts. The support bosses are disposed on the bottom plate. The fixed parts are connected to the support bosses. The two support bosses are spaced part in the movement direction of the synchronous slider. The synchronous slider is disposed between the two support bosses.

In a possible implementation, each swing arm body includes two connecting support arms. The two connecting support arms are arranged in parallel in the movement direction of the synchronous slider. The two connecting support arms are slidably connected to each other. Each swing arm assembly further includes elastic members. Each elastic member is disposed between the two connecting support arms. The elastic members are disposed corresponding to the second adapter parts.

In a possible implementation, one of the connecting support arms includes an insertion block, and the other connecting support arm includes an insertion slot. The insertion block is inserted into the insertion slot in the movement direction of the synchronous slider.

In a possible implementation, each swing arm body includes limiting surfaces facing the second adapter parts, at least part of each limiting surface is located in the relief space, and a surface that is of the limiting guide track and that faces the relief space abuts against the limiting surface in the movement direction of the synchronous slider.

In a possible implementation, the hinge apparatus further includes elastic damping members. The elastic damping member is disposed on at least one side of the synchronous slider in the movement direction of the synchronous slider.

In a possible implementation, the elastic damping member includes an annular body. The annular body includes elastic arms and support arms. The two elastic arms are spaced apart. The support arms are connected to the two elastic arms. The elastic arms and the support arms are disposed alternately. One of the elastic arms is connected to the synchronous slider, and the other elastic arm is connected to at least one of the shaft cover and the limiting guide track.

In a possible implementation, the elastic damping member further includes connecting support arms. The elastic arms are connected to the connecting support arms. One of the connecting support arms on the elastic arms is connected to the synchronous slider, and the other connecting support arm on the elastic arm is connected to at least one of the shaft cover and the limiting guide track.

In a possible implementation, the elastic arm, the support arm, and the connecting support arm are an integrally formed structure.

In a possible implementation, the synchronous sliders are slidably connected to the shaft cover.

In a possible implementation, the shaft cover includes ribs. The ribs are located at a side that is of the synchronous slider and that faces away from the limiting guide track. The ribs abut against a surface that is of the synchronous slider and that faces away from the limiting guide track. The synchronous slider is slidably fitted to the ribs.

In a possible implementation, the shaft cover includes a bottom plate and side plates. The bottom plate and the side plates form the accommodation recess parts. The ribs are formed on the bottom plate. The limiting guide track is located at a side that is of the synchronous slider and that faces away from the bottom plate.

In a possible implementation, the side plates are provided with relief notches. When the swing arm bodies are located at the unfolded position, the relief notches accommodate the swing arm bodies. A second aspect of this application provides an electronic device, including the hinge apparatus according to any one of the foregoing implementations.

An electronic device in embodiments of this application may be referred to as user equipment (user equipment, UE), a terminal (terminal), or the like. For example, the electronic device may be a mobile terminal such as a tablet computer (portable android device, PAD), a personal digital assistant (personal digital assistant, PDA), a handheld device having a wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in a smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in a smart city (smart city), or a wireless terminal in a smart home (smart home), or a fixed terminal. A form of a terminal device is not specifically limited in embodiments of this application.

In an embodiment of this application, an example in which an electronic device is a handheld device having a wireless communication function is used for description. The handheld device having a wireless communication function may be, for example, a foldable screen device. The foldable screen device may be a foldable mobile phone including a foldable flexible display screen. <FIG> schematically shows a structure of an electronic device <NUM> in an unfolded state according to an embodiment. <FIG> schematically shows a structure of the electronic device <NUM> in a semi-folded state. <FIG> schematically shows a structure of the electronic device <NUM> in a folded state. Refer to <FIG>. The electronic device <NUM> includes a housing <NUM> and a flexible display screen <NUM>. The housing <NUM> includes frames <NUM> and a hinge apparatus <NUM>. The frames <NUM> are connected to the hinge apparatus <NUM>. The frames <NUM> may be respectively disposed on two opposite sides of the hinge apparatus <NUM>. The flexible display screen <NUM> is connected to the frames <NUM>.

The frames <NUM> are rotatable relative to the hinge apparatus <NUM> to be folded. In this application, an example in which the electronic device <NUM> includes two frames <NUM> is used for description. When the two frames <NUM> are stacked, the electronic device <NUM> is in a folded state. When the two frames <NUM> in a stacked state move away from each other and are unfolded to a same plane, the electronic device <NUM> is in an unfolded state. A process in which the frames <NUM> change from a folded state to an unfolded state is an unfolding process, and a process in which the frames <NUM> change from an unfolded state to a folded state is a folding process.

In some implementations, each frame <NUM> may include a middle frame. The frames <NUM> may be connected to the hinge apparatus <NUM> via the middle frames.

<FIG> schematically shows an explosive view of a partial structure of the electronic device <NUM> according to this application. Refer to <FIG>. A flexible display screen <NUM> includes a display part for displaying image information. The flexible display screen <NUM> is bendable and may be folded under external force. When the electronic device <NUM> is in an unfolded state, the display part of the flexible display screen <NUM> is unfolded to present the image information to a user. The display part may include a first display region <NUM>, a second display region <NUM>, and a third display region <NUM>. The first display region <NUM> and the second display region <NUM> are arranged corresponding to two frames <NUM>, respectively. The third display region <NUM> may be arranged corresponding to a hinge apparatus <NUM>.

When the two frames <NUM> are in a folded state, the display part is in a bent state. The first display region <NUM> and the second display region <NUM> of the display part may be stacked, and the third display region <NUM> may be bent into an arc state.

When the two frames <NUM> are in an unfolded state, the display part is in an unfolded state, and the first display region <NUM>, the second display region <NUM>, and the third display region <NUM> are in a flat state. The electronic device <NUM> may change an overall size by folding or unfolding and may have a large display area in an unfolded state.

Electronic components are provided in each of the two frames <NUM> of the electronic device <NUM>, for example, the electronic components may include but are not limited to a processor, a memory, or a camera module. In some examples, main boards are disposed in the frames <NUM>. The electronic components are disposed on the main boards. The main board may be a printed circuit board (printed circuit board, PCB).

<FIG> schematically shows a structure of a hinge apparatus <NUM> according to this application. Refer to <FIG> and <FIG>, the hinge apparatus <NUM> of this application includes a shaft cover <NUM>. The shaft cover <NUM> may be located between the two frames <NUM>. The shaft cover <NUM> may cover another structural part on the hinge apparatus <NUM>, so that the electronic device <NUM> has a trim and aesthetic appearance. When the two frames <NUM> rotate relative to the hinge apparatus <NUM>, a position of the shaft cover <NUM> may remain relatively fixed. In some examples, when the two frames <NUM> are in an unfolded state, the two frames <NUM> may cover the shaft cover <NUM> so that the shaft cover <NUM> is a concealed state. When the two frames <NUM> are in a folded state, at least part of the shaft cover <NUM> may be exposed out of the two frames <NUM> to be in a visible state. The shaft cover <NUM> can provide a mounting base for related structural parts of the hinge apparatus <NUM>. In some examples, the shaft cover <NUM> may be a strip-shaped structure. For example, the frames <NUM> are respectively disposed on two sides of the shaft cover <NUM> in a width direction X of the shaft cover <NUM>. The shaft cover <NUM> includes accommodation recess parts 51a. When the hinge apparatus <NUM> is used in the electronic device <NUM>, the accommodation recess parts 51a of the shaft cover <NUM> may face the flexible display screen <NUM>. In other words, a side that is of the shaft cover <NUM> and that faces the flexible display screen <NUM> may be provided with the accommodation recess parts 51a.

A material of the shaft cover <NUM> may be a metal material such as, but not limited to, stainless steel or titanium alloy.

The hinge apparatus <NUM> further includes bases <NUM>. The bases <NUM> may be configured to provide a mounting base for other parts. In some possible implementations, the bases <NUM> may be detachably connected to the shaft cover <NUM> in a manner such as, but not limited to, using screws to connect the bases <NUM> to the shaft cover <NUM>. The bases <NUM> are disposed in the accommodation recess parts 51a of the shaft cover <NUM>. When the hinge apparatus <NUM> is used in the electronic device <NUM>, the base <NUM> is located at the side that is of the shaft cover <NUM> and that faces the flexible display screen <NUM>.

<FIG> schematically shows a partial structure of a hinge apparatus <NUM> according to this application. Refer to <FIG> and <FIG>. The base <NUM> includes relief spaces 52a and first adapter parts 52b. The first adapter parts 52b face the relief spaces 52a. The base <NUM> includes a limiting guide track <NUM> and a synchronous slider <NUM>. The limiting guide track <NUM> is connected to the shaft cover <NUM>. The limiting guide track <NUM> is disposed at a side that is of the synchronous slider <NUM> and that faces away from the shaft cover <NUM>. The synchronous slider <NUM> is slidably connected to the limiting guide track <NUM>. After the limiting guide track <NUM> is connected to the shaft cover <NUM>, the limiting guide track <NUM> can form a positional limitation on the synchronous slider <NUM>, so that the synchronous slider <NUM> is less likely to separate from the limiting guide track <NUM> and the shaft cover <NUM>. The limiting guide track <NUM> can guide the synchronous slider <NUM>, to ensure accuracy of a movement direction of the synchronous slider <NUM>, so that the synchronous slider <NUM> is less likely to deviate. For example, a movement direction of the synchronous slider <NUM> may be the same as a length direction Y of the shaft cover <NUM>.

<FIG> schematically shows a partial structure of a hinge apparatus <NUM> according to this application. The limiting guide track <NUM> shown in <FIG> is removed in the structure shown in <FIG>. <FIG> schematically shows a partial structure of a hinge apparatus <NUM> according to this application. Refer to <FIG>. The hinge apparatus <NUM> further includes swing arm assemblies <NUM>. The swing arm assemblies <NUM> each include swing arm bodies <NUM> and second adapter parts <NUM>. The swing arm bodies <NUM> are connected to the frames <NUM>. For example, the swing arm bodies <NUM> are detachably connected to the frames <NUM>. Each swing arm body <NUM> includes a connection end 531a and a free end 531b. The connection end 531a of the swing arm body <NUM> is close to the base <NUM>, and the free end 531b of the swing arm body <NUM> is away from the base <NUM>. The free ends 531b of the swing arm bodies <NUM> may be configured to be connected to the frames <NUM>. At least part of the connection end 531a is located in the relief space 52a of the base <NUM>. The second adapter parts <NUM> are connected to the connection ends 531a of the swing arm bodies <NUM>. The second adapter parts <NUM> are rotatably connected to the first adapter parts 52b. For example, the second adapter part <NUM> is located at a side of the swing arm body <NUM> in a movement direction of the synchronous slider <NUM>. A rotation axis of the second adapter part <NUM> extends in the length direction Y of the shaft cover <NUM>. The second adapter parts <NUM> are connected to the synchronous slider <NUM>.

The swing arm bodies <NUM> rotate relative to the first adapter parts 52b via the second adapter parts <NUM>, to switch between a folded position and an unfolded position. When the swing arm bodies <NUM> rotate relative to the base <NUM>, the relief spaces 52a of the base <NUM> may accommodate the swing arm bodies <NUM>, to avoid positional interference between the base <NUM> and the swing arm bodies <NUM>. When the swing arm bodies <NUM> are connected to the frames <NUM>, the swing arm bodies <NUM> may flip synchronously with the frames <NUM>, so that the frames <NUM> may rotate relative to the hinge apparatus <NUM> to be folded. In addition, when the second adapter parts <NUM> rotate relative to the first adapter parts 52b, the second adapter parts <NUM> synchronously drive the synchronous slider <NUM> to move between a first position and a second position. When the swing arm bodies <NUM> are at the folded position, the synchronous slider <NUM> is in the first position. When the swing arm bodies <NUM> are at the unfolded position, the synchronous slider <NUM> is in the second position.

The synchronous slider <NUM> can realize movement synchronization of the swing arm assemblies <NUM> on two sides of the shaft cover <NUM>, to ensure movement synchronization of the frames <NUM> on the two sides of the shaft cover <NUM>, so that consistence of rotation angles of the frames <NUM> on the two sides during folding and unfolding are ensured, thereby facilitating improvement of stability and smoothness of the flexible display screen <NUM> during folding or unfolding, and improving convenience as well as experience and satisfaction during use of the electronic device <NUM>.

In the hinge apparatus <NUM> according to an embodiment of this application, the shaft cover <NUM> can provide a mounting base for the bases <NUM> and the swing arm assemblies <NUM>. The shaft cover <NUM> can protect the bases <NUM> and the swing arm assemblies <NUM>. Each base <NUM> includes the synchronous slider <NUM> and the limiting guide track <NUM>. The synchronous slider <NUM> is slidable relative to the limiting guide track <NUM>. The limiting guide track <NUM> can form a positional limitation on the synchronous slider <NUM>. The base <NUM> further includes relief spaces 52a and first adapter parts 52b. Part of the swing arm body <NUM> of the swing arm assembly <NUM> is located in the relief space 52a, to facilitate increasing structural compactness of the hinge apparatus <NUM>. The second adapter parts <NUM> of the swing arm assemblies <NUM> are rotatably connected to the first adapter parts 52b of the bases <NUM>. The second adapter parts <NUM> are connected to the synchronous slider <NUM>. When the swing arm bodies <NUM> and the second adapter parts <NUM> rotate relative to the first adapter parts 52b, the second adapter parts <NUM> synchronously drive the synchronous slider <NUM> to move relative to the limiting guide track <NUM>, so that synchronization between a flipping process of the swing arm bodies <NUM> and a movement process of the synchronous slider <NUM> may be achieved, and the synchronous slider <NUM> can achieve synchronization of flipping movements of the swing arm bodies <NUM> on two sides of the shaft cover <NUM>, to ensure that the frames <NUM> connected to the swing arm bodies <NUM> can rotate synchronously, thereby facilitating improvement of convenience as well as experience and satisfaction during use of the electronic device <NUM>.

In some possible implementations, the hinge apparatus <NUM> includes two bases <NUM>. The two bases <NUM> are spaced apart in the length direction Y of the shaft cover <NUM>. The bases <NUM> may be disposed close to end parts of the shaft cover <NUM>. Two swing arm assemblies <NUM> may be connected to one base <NUM>, and the two swing arm assemblies <NUM> are spaced apart in the width direction X of the shaft cover <NUM>. Under limitation of the synchronous slider <NUM>, the two swing arm assemblies <NUM> may flip synchronously. The second adapter parts <NUM> of the two swing arm assemblies <NUM> may synchronously drive the synchronous slider <NUM> to move. When the swing arm bodies <NUM> are in the folded position, the free ends 531b of the two swing arm bodies <NUM> are close to each other. When the swing arm bodies <NUM> are in the unfolded position, the free ends 531b of the two swing arm bodies <NUM> are away from each other. In some examples, one frame <NUM> may be connected to the two swing arm assemblies <NUM>.

In some other possible implementations, <FIG> schematically shows a cross-sectional structure obtained by cutting in a W-W direction in <FIG>. Refer to <FIG>. The first adapter parts 52b are arc slide ways. The first adapter parts 52b are circular-arc-shaped. An axial direction of the first adapter part 52b is the same as the length direction Y of the shaft cover <NUM>. In addition, the axial direction of the first adapter part 52b is the same as the movement direction of the synchronous slider <NUM>. The first adapter parts 52b are communicated with the relief spaces 52a. The first adapter parts 52b may be observed from the relief spaces 52a. The second adapter parts <NUM> are arc structures. The second adapter parts <NUM> are circular-arc-shaped. An axial direction of the second adapter part <NUM> is the same as the length direction Y of the shaft cover <NUM>. In addition, the axial direction of the second adapter part <NUM> is the same as the movement direction of the synchronous slider <NUM>. The second adapter parts <NUM> are fitted to the first adapter parts 52b by insertion. At least part of the second adapter part <NUM> is located in the first adapter part 52b. An axis of the first adapter part 52b is coaxial with an axis of the second adapter part <NUM>. A shape of the first adapter part 52b matches a shape of the second adapter part <NUM>. When a rotation moment is applied to the second adapter part <NUM>, the second adapter part <NUM> may rotate in the first adapter part 52b. When the second adapter part <NUM> rotates, part of the second adapter part <NUM> may rotate into or rotate out from the first adapter part 52b.

In some examples, when the swing arm bodies <NUM> are in an unfolded position, the second adapter parts <NUM> are entirely located in the first adapter parts 52b. Alternatively, most of the second adapter parts <NUM> are located in the first adapter parts 52b. The swing arm bodies <NUM> are in a folded position, most of the second adapter parts <NUM> are located outside the first adapter parts 52b. The rotatable connection between the first adapter parts 52b of the bases <NUM> and the second adapter parts <NUM> of the swing arm assemblies <NUM> may be implemented without needing to provide additional connecting pieces to connect the first adapter parts 52b and the second adapter parts <NUM>, thereby facilitating reduction of a quantity of parts used, and increasing structural compactness of the hinge apparatus <NUM>. In addition, the insertion fitting between the first adapter parts 52b and the second adapter parts <NUM> in arc structures enables the bases <NUM> to form a positional limitation on the second adapter parts <NUM>, to ensure smoothness of the first adapter parts 52b during rotation relative to the second adapter parts <NUM> and make the first adapter parts 52b and the second adapter parts <NUM> less likely to separate.

In some examples, the first adapter parts 52b and the second adapter parts <NUM> are disposed on two sides of the swing arm body <NUM> in the movement direction of the synchronous slider <NUM>, so that the swing arm body <NUM> may be rotatably connected to the first adapter parts 52b of the bases <NUM> via the second adapter parts <NUM> on the two sides, thereby facilitating improvement of stress equalization of the swing arm body <NUM>, and ensuring smooth rotation of the swing arm body <NUM>.

The synchronous slider <NUM> may include first helical surfaces 522a. The first helical surfaces 522a are arranged corresponding to the first adapter parts 52b. The first helical surfaces 522a may be observed via the first adapter parts 52b in the movement direction of the synchronous slider <NUM>. Each first helical surface 522a is located at a side that is of the first adapter part 52b and that faces away from the relief space 52a. The second adapter part <NUM> includes second helical surfaces 532a. A top surface that is of the second adapter part <NUM> and that faces away from the swing arm body <NUM> may be the second helical surface 532a. The first helical surfaces 522a are in contact with the second helical surfaces 532a, so that the second adapter parts <NUM> may transmit driving force to the synchronous slider <NUM> in contact regions between the first helical surfaces 522a and the second helical surfaces 532a. Helix directions of the first helical surfaces 522a on the two sides of the swing arm body <NUM> are identical to the movement direction of the synchronous slider <NUM>, and helix directions of the second helical surfaces 532a on the two sides of the swing arm body <NUM> are identical. When the second adapter parts <NUM> rotate relative to the first adapter parts 52b, the first helical surfaces 522a and the second helical surfaces 532a slide relative to each other synchronously, to enable the second adapter parts <NUM> to drive the synchronous slider <NUM> to move. When the swing arm body <NUM> switches between an unfolded position and a folded position, the first helical surfaces 522a and the second helical surfaces 532a on two sides of the swing arm body <NUM> remain in a close contact state. The second adapter part <NUM> on one side of the swing arm body <NUM> pushes the synchronous slider <NUM>, the second adapter part <NUM> on the other side of the swing arm body <NUM> releases the synchronous slider <NUM>, to realize movement of the synchronous slider <NUM>, and ensure synchronization between a rotating process of the swing arm body <NUM> and a movement process of the synchronous slider <NUM>.

Transmission between the synchronous slider <NUM> and the swing arm assemblies <NUM> achieved via the first helical surfaces 552a and the second helical surfaces 532a facilitates lowering possibility of the synchronous slider <NUM> and the swing arm assembly <NUM> getting stuck, ensure smooth rotation of the swing arm assemblies <NUM>, and facilitates ensuring synchronization in rotation of the two swing arm assemblies <NUM> on the two side of the synchronous slider <NUM>. When a rotation moment is applied to one of the two swing arm assemblies <NUM> that are connected to a same synchronous slider <NUM>, the stressed swing arm assembly <NUM> is not easy to rotate, while when a rotation moment is applied to both the two swing arm assemblies <NUM>, the two swing arm assemblies <NUM> may synchronously rotate relative to the synchronous slider <NUM>.

In some examples, the two swing arm assemblies <NUM> are connected to the bases <NUM>. The two swing arm assemblies <NUM> are spaced apart in the width direction X of the shaft cover <NUM>. A helix direction of the first helical surface 522a corresponding to one swing arm assembly <NUM> is opposite to a helix direction of the first helical surface 522a corresponding to the other swing arm assembly <NUM>. Correspondingly, a helix direction of the second helical surface 532a corresponding to one swing arm assembly <NUM> is opposite to a helix direction of the second helical surface 532a corresponding to the other swing arm assembly <NUM>.

In some examples, when the synchronous slider <NUM> is in the first position, the swing arm bodies <NUM> are in the folded position. When the synchronous slider <NUM> is in the second position, the swing arm bodies <NUM> are in the unfolded position. When the swing arm bodies <NUM> rotate from the folded position to the unfolded position, the synchronous slider <NUM> moves toward the end part of the shaft cover <NUM>, so that the synchronous slider <NUM> moves from the first position to the second position. When the swing arm bodies <NUM> rotate from the unfolded position to the folded position, the synchronous slider <NUM> moves away from the end part of the shaft cover <NUM>, so that the synchronous slider <NUM> moves from the second position to the first position.

In some examples, <FIG> schematically shows a partial structure of a hinge apparatus <NUM> with swing arm bodies <NUM> at an unfolded position according to this application. <FIG> is a schematic explosive view of a partial structure of a hinge apparatus <NUM> according to this application. <FIG> schematically shows a partial structure of a hinge apparatus <NUM> with swing arm bodies <NUM> at a folded position according to this application. Refer to <FIG>. The limiting guide track <NUM> includes first arc surfaces 521a. The synchronous slider <NUM> includes second arc surfaces 522b. An axis corresponding to each first arc surface 521a may coincide with an axis corresponding to each second arc surface 522b. There is spacing between the first arc surface 521a and the second arc surface 522b. Arc slide ways are formed between the first arc surfaces 521a of the limiting guide track <NUM> and the second arc surfaces 522b of the synchronous slider <NUM>. The second adapter parts <NUM> include third arc surfaces 532b and fourth arc surfaces 532c. An axis corresponding to each third arc surface 532b may coincide with an axis corresponding to each fourth arc surface 532c. After the second adapter parts <NUM> of the swing arm assemblies <NUM> are fitted to the bases <NUM>, the first arc surfaces 521a of the limiting guide track <NUM> are in contact with the third arc surfaces 532b of the second adapter parts <NUM>, and the second arc surfaces 522b of the limiting guide track <NUM> are in contact with the fourth arc surfaces 532c of the second adapter parts <NUM>, so that looseness or shake of the second adapter parts <NUM> and the bases <NUM> is less likely to occur, thereby ensuring smoothness of the second adapter parts <NUM> during rotation relative to the bases <NUM>. The first helical surfaces 522a on the synchronous slider <NUM> are connected to the second arc surfaces 522b. The second helical surfaces 532a on the second adapter parts <NUM> connect the third arc surfaces 532b to the fourth arc surfaces 532c.

For example, recess spaces are provided on the synchronous slider <NUM>. A bottom surface that is of each recess space and that faces the limiting guide track <NUM> is the second arc surface 522b, and the limiting guide track <NUM> has the first arc surfaces 521a facing the recess spaces. After the limiting guide track <NUM> is fitted to the synchronous slider <NUM>, the first adapter parts 52b are formed between the first arc surfaces 521a and the second arc surfaces 522b.

In some examples, <FIG> schematically shows a structure of a swing arm assembly <NUM> according to this application. Refer to <FIG> and <FIG>. The swing arm bodies <NUM> include limiting surfaces 531c facing the second adapter parts <NUM>. At least part of the limiting surface 531c is located in a relief space 52a. A surface that is of the limiting guide track <NUM> and that faces the relief space 52a abuts against the limiting surface 531c in a movement direction of the synchronous slider <NUM>, so that when the swing arm assembly <NUM> rotates relative to the base <NUM>, the limiting guide track <NUM> may restrict movement of the swing arm assembly <NUM> in a length direction Y of the shaft cover <NUM>. For example, the second adapter parts <NUM> includes the third arc surfaces 532b. The limiting surfaces 531c of the swing arm bodies <NUM> are connected to the third arc surfaces 532b of the second adapter parts <NUM>.

In some examples, <FIG> schematically shows a cross-sectional structure obtained by cutting in a W-W direction in <FIG>. <FIG> is a schematic explosive view of a partial structure of a hinge apparatus <NUM> according to this application. <FIG> schematically shows a structure of a synchronous slider <NUM> according to this application. Refer to <FIG>. The synchronous slider <NUM> includes guide recesses 522c. An extension direction of the guide recess 522c is the same as a movement direction of the synchronous slider <NUM>. The guide recesses 522c face a limiting guide track <NUM>. The first adapter parts 52b are communicated with the guide recesses 522c. The guide recess 522c is disposed at a side that is of the first adapter part 52b and that faces away from a relief space 52a. The limiting guide track <NUM> includes guide parts 521b. The guide parts 521b are located in the guide recess 522c. A shape of the guide part 521b matches a shape of the guide recess 522c. The synchronous slider <NUM> is rotatably connected to the guide parts 521b. The guide parts 521b of the limiting guide track <NUM> can form a positional limitation on the synchronous slider <NUM>, so that the synchronous slider <NUM> is less likely to deviate relative to the limiting guide track <NUM> during movement of the synchronous slider <NUM> in a length direction Y of a shaft cover <NUM>. For example, the synchronous slider <NUM> is less likely to deviate in a width direction X of the shaft cover <NUM>. The synchronous slider <NUM> includes two opposite end surfaces in the length direction Y of the shaft cover <NUM>. The guide recesses 522c on the synchronous slider <NUM> may be configured to run through the end surfaces.

A quantity of the guide recesses 522c on the synchronous sliders <NUM> is two. Correspondingly, a quantity of the guide parts 521b on the limiting guide track <NUM> is two. The two guide recesses 522c are spaced apart and the two guide parts 521b are spaced apart in the width direction X of the shaft cover <NUM>.

For example, an inner wall that is of the guide recess 522c and that faces the limiting guide track <NUM> may be an arc surface, and a surface that is of the guide part 521b and that faces the guide recess 522c may be an arc surface. The inner wall that is of the guide recess 522c and that faces the limiting guide track <NUM> is connected to a first helical surface 522a.

The surface that is of the guide part 521b and that faces the guide recess 522c may be flush with the first arc surface 521a of the limiting guide track <NUM>, so that the surface that is of the guide part 521b and that faces the guide recess 522c may be smoothly transitioned to the first arc surface 521a of the limiting guide track <NUM>.

For example, a surface that is of the limiting guide track <NUM> and that faces away from the shaft cover <NUM> is a plane. When the swing arm bodies <NUM> are at an unfolded position, a surface that is of the swing arm body <NUM> and that faces away from the shaft cover <NUM> may be flush with a surface that is of the limiting guide track <NUM> and that faces away from the shaft cover <NUM>. This facilitates provision of support for a flexible display screen <NUM> by both the swing arm bodies <NUM> and the limiting guide track <NUM>, thereby lowering possibility that part of the flexible display screen <NUM> lacks support due to a stepped structure formed between the swing arm bodies <NUM> and the limiting guide track <NUM>.

For example, both the surface that is of the limiting guide track <NUM> and that faces away from the shaft cover <NUM> and a surface that is of the synchronous slider <NUM> and that faces away from the shaft cover <NUM> may be planar. The surface that is of the limiting guide track <NUM> and that faces away from the shaft cover <NUM> may be flush with the surface that is of the synchronous slider <NUM> and that faces away from the shaft cover <NUM>. When the swing arm bodies <NUM> are at the unfolded position, the surface that is of the swing arm body <NUM> and that faces away from the shaft cover <NUM>, the surface that is of the limiting guide track <NUM> and that faces away from the shaft cover <NUM>, and the surface that is of the synchronous slider <NUM> and that faces away from the shaft cover <NUM> may be all flush with each other.

In some possible implementations, the limiting guide track <NUM> includes two limiting guide members <NUM>. The two limiting guide members <NUM> are respectively connected to the shaft cover <NUM>. The two limiting guide members <NUM> are spaced apart in the movement direction of the synchronous slider <NUM>. A first relief part 521c is formed between the two limiting guide members <NUM>. The synchronous slider <NUM> includes end connection parts <NUM> and an intermediate connection part <NUM>. A quantity of the end connection parts <NUM> is two. The two end connection parts <NUM> are spaced apart in the movement direction of the synchronous slider <NUM>. The intermediate connection part <NUM> connects the two end connection parts <NUM>. The synchronous slider <NUM> includes second relief parts 522d located on two sides of the intermediate connection part <NUM>. A width of the intermediate connection part <NUM> is less than a width of the end connection part <NUM> in the width direction X of the shaft cover <NUM>. The intermediate connection part <NUM> is connected to middle regions of the end connection parts <NUM>, so that the second relief parts 522d are formed between the end connection parts <NUM> and the intermediate connection part <NUM>. The first relief part 521c is located at a side that is of the second relief part 522d and that faces away from the shaft cover <NUM>. The first relief part 521c is communicated with the second relief parts 522d. The first relief part 521c and the second relief parts 522d form relief spaces 52a. One limiting guide member <NUM> is disposed corresponding to one end connection part <NUM>. The end connection parts <NUM> are rotatably connected to the corresponding limiting guide members <NUM>. The first adapter parts 52b are disposed between the end connection parts <NUM> and the limiting guide members <NUM>. The first adapter parts 52b are arc slide ways. The first adapter parts 52b are communicated with the second relief parts 522d.

For example, the second arc surfaces 522b and the first helical surfaces 522a are disposed on the end connection parts <NUM>. The end connection parts <NUM> are provided with guide recesses 522c. Each end connection part <NUM> is provided with two guide recesses 522c, and each limiting guide member <NUM> is provided with two guide parts 521b.

For example, the swing arm bodies <NUM> include limiting surfaces 531c facing the second adapter parts <NUM>. At least part of the limiting surface 531c is located in the first relief part 521c. A surface that is of the limiting guide member <NUM> and that faces the first relief part 521c abuts against the limiting surface 531c of the swing arm body <NUM> in the length direction Y of the shaft cover <NUM>, so that when the swing arm assemblies <NUM> rotates relative to the base <NUM>, the two limiting guide members <NUM> may restrict movement of the swing arm assemblies <NUM> in the length direction Y of the shaft cover <NUM>.

In some examples, refer to <FIG>, each limiting guide member <NUM> include a fixed part 5211a and two connecting support legs 5211b. The fixed part 5211a is connected to the two connecting support legs 5211b. The two connecting support legs 5211b are spaced apart in the width direction X of the shaft cover <NUM>. The intermediate connection part <NUM> of the synchronous slider <NUM> is disposed corresponding to a space between the two connecting support legs 5211b. The fixed parts 5211a of the limiting guide members <NUM> is connected to the shaft cover <NUM>. The end connection parts <NUM> are rotatably connected to corresponding connecting support legs 5211b. The first adapter parts 52b are provided between the end connection parts <NUM> and the connecting support legs 5211b. The second adapter parts <NUM> of the swing arm assemblies <NUM> are located between the end connection parts <NUM> and the connecting support legs 5211b.

For example, the two connecting support legs 5211b of the limiting guide member <NUM> are located at a same side of the fixed part 5211a in the length direction Y of the shaft cover <NUM>. Two limiting guide members <NUM> in the base <NUM>, connecting support legs 5211b of one limiting guide member <NUM> face connecting support legs 5211b of another limiting guide member <NUM>. The first relief part 521c is formed between the connecting support legs 5211b of one limiting guide member <NUM> and the connecting support legs 5211b of another limiting guide member <NUM>.

For example, the first arc surfaces 521a are provided on the connecting support legs 5211b of the limiting guide members <NUM>, and the second arc surfaces 522b and the first helical surfaces 522a are provided on the end connection parts <NUM>.

For example, the end connection part <NUM> may be provided with guide recesses 522c. Guide parts 521b are provided on the connecting support legs 5211b of the limiting guide members <NUM>. For example, a length of the end connection part <NUM> is less than a length of the connecting support leg 5211b in the length direction Y of the shaft cover <NUM>.

In some examples, refer to <FIG>, the shaft cover <NUM> includes a bottom plate <NUM>, side plates <NUM>, and support bosses <NUM>. The bottom plate <NUM> and the side plates <NUM> form accommodation recess parts 51a. The base <NUM> is disposed between the two side plates <NUM> in the width direction X of the shaft cover <NUM>. A limiting guide track <NUM> of the base <NUM> is disposed at a side that is of the synchronous slider <NUM> and that faces away from the bottom plate <NUM>. The support bosses <NUM> are disposed on the bottom plate <NUM>. The fixed part 5211a of the limiting guide member <NUM> is located at a side that is of the support boss <NUM> and that faces away from the bottom plate <NUM>. The fixed part 5211a is connected to the support boss <NUM>. The two support bosses <NUM> are spaced apart in a movement direction of the synchronous slider <NUM>. The synchronous slider <NUM> is disposed between the two support bosses <NUM>.

For example, the fixed parts 5211a of the limiting guide members <NUM> are detachably connected to the support bosses <NUM>. For example, the fixed parts 5211a may be connected to the support bosses <NUM> by using screws.

The synchronous slider <NUM> according to an embodiment of this application is slidably connected to the shaft cover <NUM>, so that the synchronous slider <NUM> is slidably connected to the limiting guide track <NUM>, and the synchronous slider <NUM> is slidably connected to the shaft cover <NUM>, to positionally limit the synchronous slider <NUM> by the limiting guide track <NUM> and the shaft cover <NUM> together, thereby facilitating improvement of stability of the synchronous slider <NUM> during movement.

In some possible implementations, as shown in <FIG> and <FIG>, the shaft cover <NUM> may include ribs <NUM>. The ribs <NUM> are located at a side that is of the synchronous slider <NUM> and that faces away from the limiting guide track <NUM>. The ribs <NUM> abut against a surface that is of the synchronous slider <NUM> and that faces away from the limiting guide track <NUM>. The synchronous slider <NUM> is slidably fitted to the ribs <NUM>. The limiting guide track <NUM> and the ribs <NUM> abut against two sides of the synchronous slider <NUM>.

In some examples, a quantity of the ribs <NUM> may be two. The two ribs <NUM> are spaced apart in the width direction X of the shaft cover <NUM>. A surface that is of the rib <NUM> and that faces the synchronous slider <NUM> may be an arc surface, to facilitate reduction of a contact area between the rib <NUM> and the synchronous slider <NUM>, thereby reducing frictional resistance.

In some examples, the shaft cover <NUM> includes the bottom plate <NUM> and the side plates <NUM>. The bottom plate <NUM> and the side plates <NUM> form accommodation recess parts 51a. The ribs <NUM> are disposed on the bottom plate <NUM>. The limiting guide track <NUM> is located at a side that is of the synchronous slider <NUM> and that faces away from the bottom plate <NUM>. For example, there may be spacing between the synchronous slider <NUM> and the side plates <NUM>, to reduce possibility of generating frictional resistance due to contact between the synchronous slider <NUM> and the side plates <NUM>. For example, the side plates <NUM> are each provided with a relief notch. When the swing arm body <NUM> is at an unfolded position, the relief notches may accommodate the swing arm bodies <NUM>. At each relief notch, a surface that is of the swing arm body <NUM> and that faces away from the shaft cover <NUM> may be flush with a top surface that is of the side plate <NUM> and that faces away from the bottom plate <NUM>. For example, the top surface that is of the side plate <NUM> and that faces away from the bottom plate <NUM>, the surface that is of the synchronous slider <NUM> and that faces away from the bottom plate <NUM>, and a surface that is of the limiting guide member <NUM> and that faces away from the bottom plate <NUM> may all be flush with each other.

In some examples, <FIG> schematically shows a structure of a swing arm assembly <NUM> according to this application. <FIG> schematically shows an exploded structure of a swing arm assembly <NUM> according to this application. Refer to <FIG> and <FIG>. Each swing arm body <NUM> includes two connecting arms <NUM>. The two connecting arms <NUM> are disposed side by side in a movement direction of the synchronous slider <NUM>. The two connecting arms <NUM> are slidably connected to each other. The swing arm assembly <NUM> further includes elastic members <NUM>. Each elastic member <NUM> is disposed between the two connecting arms <NUM>. A second adapter part <NUM> may be correspondingly provided on a side of each connecting arm <NUM>. The elastic members <NUM> are disposed corresponding to the second adapter parts <NUM>. Each elastic member <NUM> can provide force for the two connecting arms <NUM>, so that after the swing arm assemblies <NUM> are fitted to the base <NUM>, a close contact state between the first helical surfaces 522a of the synchronous slider <NUM> and the second helical surfaces 532a of the second adapter parts <NUM> may be maintained stably, to reduce possibility of gaps between the first helical surfaces 522a and the second helical surfaces 532a, thereby effectively ensuring rotation synchronization of the swing arm assemblies <NUM>.

For example, an accommodation space 531d is formed between the two connecting arms <NUM>, and the elastic member <NUM> is disposed in the accommodation space 531d. The elastic member <NUM> may be a helical spring. An axis of the elastic member <NUM> may coincide with an axis of the second adapter part <NUM>. For example, after the two connecting arms <NUM> are fitted to the base <NUM>, the elastic members <NUM> may be in a compressed state.

In some examples, one of the connecting support arms <NUM> includes an insertion block 5311a, the other connecting support arm <NUM> includes an insertion slot 5311b. The insertion block 5311a is inserted into the insertion slot 5311b in a movement direction of the synchronous slider <NUM>. The two connecting arms <NUM> are slidably connected to each other via the insertion block 5311a and the insertion slot 5311b, and the two connecting arms <NUM> may transmit force through the insertion block 5311a, to ensure that the two connecting arms <NUM> maintain rotation synchronization.

In some examples, the connecting arm <NUM> and the second adapter part <NUM> connected to the connecting arm <NUM> are an integrally formed structure.

In some possible implementations, an assembly manner may be, but is not limited to, placing the synchronous slider <NUM> in the shaft cover <NUM>. The synchronous slider <NUM> includes the first helical surfaces 522a and the second arc surfaces 522b. Then, the elastic member <NUM> is placed into the accommodation space 531d formed between the two connecting arms <NUM>. The two connecting arms <NUM> of the swing arm assembly <NUM> are connected by insertion via the insertion block 5311a and the insertion slot 5311b. The second adapter parts <NUM> of the swing arm assembly <NUM> are placed on the synchronous slider <NUM>, and fourth arc surfaces 532c of the second adapter parts <NUM> are in close contact with second arc surfaces 522b of the synchronous slider <NUM>, and under an action of the elastic members <NUM>, the second helical surfaces 532a of the second adapter parts <NUM> are in close contact with the first helical surfaces 522a of the synchronous slider <NUM>. The limiting guide members <NUM> are placed at a top of the synchronous slider <NUM>. The first arc surfaces 521a on the connecting support legs 5211b of the limiting guide members <NUM> are in close contact with the third arc surfaces 532b of the second adapter parts <NUM>, and the guide parts 521b on the connecting support legs 5211b match the guide recesses 522c of the end connection parts <NUM>. The fixed parts 5211a of the limiting guide members <NUM> are connected to the support bosses <NUM> of the shaft cover <NUM>, to ensure that the second adapter parts <NUM> is compressed by the connecting support legs 5211b and the end connection parts <NUM>.

In some examples, the two connecting arms <NUM> of the swing arm assembly <NUM> may be connected to frames <NUM>. After the two connecting arms <NUM> are connected to the frames <NUM>, positions of the two connecting arms <NUM> are relatively fixed, and do not change anymore.

In some other possible implementations, <FIG> and <FIG> each schematically show a partial structure of a hinge apparatus <NUM> according to this application. Refer to <FIG>. The hinge apparatus <NUM> further includes elastic damping members <NUM>. The elastic damping member <NUM> is disposed on at least one side of the synchronous slider <NUM> in the movement direction of the synchronous slider <NUM>.

The swing arm assemblies <NUM> rotates relative to the base <NUM>, and during the swing arm assemblies <NUM> driving the synchronous slider <NUM> to move to switch between a first position and a second position, the synchronous slider <NUM> may cause the elastic damping members <NUM> to deform. Elastic force of the elastic damping member <NUM> may apply reaction force on the synchronous slider <NUM>, to provide damping force, to enable the synchronous slider <NUM> to maintain a smooth and slow status during a movement process. In addition, force is transmitted through the synchronous slider <NUM>, to increase rotate resistance of the swing arm assemblies <NUM>, so that a large rotation moment needs to be applied to the swing arm assemblies <NUM> to drive the swing arm assemblies <NUM> to rotate, and the swing arm assemblies <NUM> may maintain a smooth and slow status during a rotating process. After the frames <NUM> are connected to the swing arm assemblies <NUM>, the frames <NUM> may maintain a smooth and slow status during a rotating process, thereby facilitating improvement of a hand feel during folding or unfolding the frames <NUM>.

In some examples, one end of each elastic damping member <NUM> is connected to the synchronous slider <NUM>, the other end of the elastic damping member <NUM> is connected to the shaft cover <NUM> or the limiting guide track <NUM>.

In some examples, the elastic damping member <NUM> is disposed on a side of an end part that is of the synchronous slider <NUM> and that faces away from the shaft cover <NUM>.

In some examples, the synchronous slider <NUM> includes end connection parts <NUM> and an intermediate connection part <NUM>. The elastic damping members <NUM> are connected to the end connection parts <NUM>.

In some examples, the synchronous slider <NUM> includes first helical surfaces 522a, and the second adapter parts <NUM> of the swing arm assembly <NUM> include second helical surfaces 532a. The elastic damping members <NUM> apply force on the synchronous slider <NUM>. This may increase frictional resistance between the first helical surfaces 522a and the second helical surfaces 532a, thereby increasing rotation resistance of the swing arm assembly <NUM>.

The elastic damping member <NUM> according to an embodiment of this application may include an annular body <NUM>. The annular body <NUM> includes elastic arms <NUM> and support arms <NUM>. Two elastic arms <NUM> are spaced apart in a movement direction of the synchronous slider <NUM>. The support arms <NUM> are connected to the two elastic arms <NUM>. The two support arms <NUM> are spaced apart in a width direction X of the shaft cover <NUM>. The elastic arms <NUM> and the support arms <NUM> are disposed alternately. One of the elastic arms <NUM> is connected to the synchronous slider <NUM>, and the other elastic arm <NUM> is connected to at least one of the shaft cover <NUM> and the limiting guide track <NUM>. During the synchronous slider <NUM> moving and switching between a first position and a second position, the synchronous slider <NUM> may cause the elastic arms <NUM> to deform.

The elastic arm <NUM> according to an embodiment of this application may be a plate-like structure. The support arm <NUM> may be a plate-like structure.

In some examples, the elastic damping member <NUM> is disposed on a side of an end part that is of the synchronous slider <NUM> and that faces away from the shaft cover <NUM>. During the synchronous slider <NUM> moving from the first position to the second position, the synchronous slider <NUM> may apply force on the elastic arms <NUM>, to cause the two elastic arms <NUM> of the annular body <NUM> to move away from each other. During the synchronous slider <NUM> moving from the second position to the first position, the synchronous slider <NUM> may apply force on the elastic arms <NUM>, to cause the two elastic arms <NUM> of the annular body <NUM> to move toward each other.

The elastic damping member <NUM> according to an embodiment of this application may further include connecting support arms <NUM>. The elastic arms <NUM> are connected to the connecting support arms <NUM>. One of the connecting support arms <NUM> on the elastic arm <NUM> is connected to the synchronous slider <NUM>, and the other connecting support arm <NUM> on the elastic arm <NUM> is connected to at least one of the shaft cover <NUM> and the limiting guide track <NUM>.

The connecting support arm <NUM> may be disposed on the outer side of the elastic arm <NUM>. The connecting support arms <NUM> may be connected to middle regions of the elastic arms <NUM> in a width direction of the shaft cover <NUM>.

In some examples, the synchronous slider <NUM> may be provided with connecting holes <NUM>, and the connecting support arms <NUM> may be inserted into connecting holes <NUM>, to enable the synchronous slider <NUM> to be connected to the elastic damping members <NUM>, thereby facilitating reduction of a quantity of parts used to implement connection between the synchronous slider <NUM> and the elastic damping members <NUM> and reduction of assembly complexity of the synchronous slider <NUM> and the elastic damping members <NUM>.

In some examples, the connecting support arms <NUM> on the elastic arms <NUM> are connected to the shaft cover <NUM>. The shaft cover <NUM> may be provided with the connecting holes <NUM>, and the connecting support arms <NUM> may be inserted into the connecting holes <NUM>, to enable the shaft cover <NUM> to be connected to the elastic damping members <NUM>, thereby facilitating reduction of a quantity of parts used to implement connection between the shaft cover <NUM> and the elastic damping members <NUM> and reduction of assembly complexity of the shaft cover <NUM> and the elastic damping members <NUM>.

In some examples, the connecting support arms <NUM> of the elastic arms <NUM> are connected to the limiting guide track <NUM>. The limiting guide track <NUM> may be provided with connecting holes <NUM>, and the connecting support arms <NUM> may be inserted into the connecting holes <NUM>, to enable the limiting guide track <NUM> to be connected to the elastic damping members <NUM>, thereby facilitating reduction of a quantity of parts used to implement connection between the limiting guide track <NUM> and the elastic damping members <NUM> and reduction of assembly complexity of the limiting guide track <NUM> and the elastic damping members <NUM>. For example, the limiting guide track <NUM> includes limiting guide members <NUM>. The connecting support arms <NUM> may be connected to the fixed parts 5211a of the limiting guide members <NUM>.

In some examples, each connecting support arm <NUM> includes a first plate body and a second plate body. The first plate body intersects with the second plate body. The second plate body is connected to a middle region of the first plate body in the width direction X of the shaft cover <NUM>. An end of the second plate body is connected to the first plate body, and another end of the second plate body is connected to the elastic arms <NUM> of the annular body <NUM>.

The elastic damping member <NUM> according to an embodiment of this application may be an integrally formed structure. In other words, the elastic arm <NUM>, the support arm <NUM>, and the connecting support arm <NUM> may be an integrally formed structure, so that the structure of the elastic damping member <NUM> is simple. The elastic damping members <NUM> may be connected to the synchronous slider <NUM> as a whole part, to reduce a quantity of parts of the hinge apparatus <NUM>, increase structural compactness of the hinge apparatus <NUM>, reduce space occupancy of the hinge apparatus <NUM>, and facilitate reduction of assembly complexity of the elastic damping members <NUM> and the synchronous slider <NUM>.

In descriptions of embodiments of this application, it should be noted that, unless specified or limited otherwise, the terms "mounting", "connected", and "connecting" should be understood broadly, for example, which may be a fixed connection, an indirect connection through an intermediary, or internal communication inside two components or an interaction relationship between two components. A person of ordinary skill in the art can understand specific meanings of the foregoing terms in embodiments of this application according to a specific situation.

In embodiments of this application, it is not implied that an apparatus or an element needs to have a particular orientation or needs to be constructed and operated in a particular orientation, and therefore cannot be construed as a limitation on embodiments of this application. In the descriptions of embodiments of this application, unless otherwise specifically limited, "a plurality of" means two or more than two.

The terms such as "first", "second", "third", and "fourth" (if any) in the specification and claims of embodiments of this application and in the accompanying drawings are used for distinguishing between similar objects and not necessarily used for describing any particular order or sequence. It is to be understood that data used in this way is exchangeable in a proper case, so that embodiments of this application described herein can be implemented in an order different from the order shown or described herein. Moreover, the terms "include", "contain" and any other variants mean to cover the non-exclusive inclusion, for example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those expressly listed steps or units, but may include other steps or units not expressly listed or inherent to such a process, method, system, product, or device.

The term "more" in this specification refers to two or more than two. The term "and/or" used herein describes only an association relationship for describing associated objects and represents that three relationships may exist. For example, A and/or B may represent the following three cases: only A exists, both A and B exist, and only B exists. In a formula, the character "/" indicates a "division" relationship between the associated objects.

Claim 1:
A hinge apparatus, comprising:
a shaft cover, comprising accommodation recess parts;
bases, disposed in the accommodation recess parts, wherein each base comprises relief spaces and first adapter parts, the first adapter parts face the relief spaces, the base comprises a synchronous slider and a limiting guide track, the limiting guide track is connected to the shaft cover, the limiting guide track is disposed at a side that is of the synchronous slider and that faces away from the shaft cover, and the synchronous slider is slidably connected to the limiting guide track; and
swing arm assemblies, each comprising swing arm bodies and second adapter parts, wherein each swing arm body comprises a connection end and a free end, the connection end is close to the base, the free end is away from the base, at least part of the connection end is located in the relief space, the second adapter parts are connected to the connection ends, the second adapter parts are rotatably connected to the first adapter parts, the second adapter parts are connected to the synchronous slider, the swing arm bodies rotate relative to the first adapter parts via the second adapter parts to switch between a folded position and an unfolded position, and the second adapter parts synchronously drive the synchronous slider to move between a first position and a second position; and
the synchronous slider comprises first helical surfaces, the first helical surfaces are arranged corresponding to the first adapter parts, each first helical surface is located at a side that is of the first adapter part and that faces away from the relief space, each second adapter part comprises a second helical surface, the first helical surfaces are in contact with the second helical surfaces, helix directions of the first helical surfaces on the two sides of the swing arm body are identical, helix directions of the second helical surfaces on the two sides of the swing arm body are identical, when the second adapter parts rotate opposite to the first adapter parts, the first helical surfaces and the second helical surfaces slide relative to each other synchronously, to enable the second adapter parts to drive the synchronous slider to move.