Rotating shaft assembly and foldable electronic equipment

Abstract

The invention provides a rotating shaft assembly and foldable electronic equipment, the rotating shaft assembly can be used for the foldable electronic equipment, the rotating shaft assembly comprises a pair of torque reversing mechanisms, each rotating shaft reversing mechanism comprises an arc arm and an elastic concave-convex wheel frame, and the two ends of the arc arm are provided with a first concave-convex wheel structure and a second concave-convex wheel structure respectively; a third concave-convex wheel structure and a fourth concave-convex wheel structure are arranged at the two ends of the elastic concave-convex wheel frame respectively; in the first state, the second concave-convex wheel structure is separated from the fourth concave-convex wheel structure, the first concave-convex wheel structure is meshed with the third concave-convex wheel structure, and torque in the first direction is provided; and in the second state, the first concave-convex wheel structure is separated from the third concave-convex wheel structure, the second concave-convex wheel structure is meshed with the fourth concave-convex wheel structure, torque in the second direction is provided, and the first direction is opposite to the second direction. The direction of the closing / unfolding retention force is switched through the concave wheel set and the convex wheel set which are meshed alternately, and therefore assistance can be provided for a user to open or close the foldable electronic equipment.

Description

Technical Field

[0001] The present application relates to the field of electronic devices, and more specifically, to a hinge assembly and a foldable electronic device. Background Art

[0002] The foldable electronic device can switch between a folded state and an unfolded state. When the foldable electronic device is in the folded state, the occupied space of the foldable electronic device is relatively small; when the foldable electronic device is in the unfolded state, the foldable electronic device can display a relatively large screen to increase the viewing range of the user.

[0003] When a foldable electronic device is closed, it needs a closing holding force to maintain its closed state and the feel during the closing process. Currently, a common solution is to use one or a pair of concave cams or inclined surfaces of a rotating shaft compressed by a spring to maintain the closing force torque, and to use magnets to cooperate with the maintenance of the compressed state. However, whether it is a single concave cam or inclined surface solution, it can only apply a torque in a single direction when the foldable electronic device is almost in the closed position. However, this single torque that keeps the foldable electronic device in a closed state may affect the user's unfolding feel when the user unfolds the foldable electronic device due to excessive closing force. Excessive closing force will cause additional resistance when the user opens the foldable electronic device, making the initial process of unfolding the foldable electronic device very difficult. Summary of the invention

[0004] The present application provides a hinge assembly and a foldable electronic device, which can change the torque direction of the foldable electronic device, thereby assisting the unfolding or closing of the foldable electronic device and improving the user experience.

[0005] In a first aspect, a rotating shaft assembly is provided, the rotating shaft assembly comprising a pair of torque reversing mechanisms, each torque reversing mechanism comprising: an arc arm, a tension concave cam frame, a first shaft end blocker, a second shaft end blocker and a spring, wherein:

[0006] A first concave cam structure and a second concave cam structure are respectively provided at both ends of the arc arm, the first concave cam structure and the second concave cam structure are arranged along the axial direction, and the first concave cam structure and the second concave cam structure are symmetrically arranged along a direction perpendicular to the axis;

[0007] The tension concave cam frame comprises a third concave cam structure, a fourth concave cam structure and a connecting portion connected between the third concave cam structure and the fourth concave cam structure, the connecting portion is provided with a groove, the groove can accommodate part of the arc arm, the third concave cam structure and the fourth concave cam structure are arranged along the axial direction, and there is a phase difference between the third concave cam structure and the fourth concave cam structure;

[0008] The arc arm is a hollow structure, the first concave cam structure has a first through hole, the second concave cam structure has a second through hole, the third concave cam structure has a third through hole, and the fourth concave cam structure has a fourth through hole. The spring is inserted through the arc arm, the first through hole, the second through hole, the third through hole and the fourth through hole, and the two ends of the spring are fixedly connected with the first shaft end resistance iron and the second shaft end resistance iron respectively;

[0009] The first shaft end blocker is arranged at a side of the third concave cam structure away from the first concave cam structure, and the second shaft end blocker is arranged at a side of the fourth concave cam structure away from the second concave cam structure;

[0010] In the first state, the second concave cam structure is separated from the fourth concave cam structure, the first shaft end blocker presses the third concave cam structure under the action of the spring, and the first concave cam structure is meshed with the third concave cam structure to provide a torque in a first direction;

[0011] In the second state, the first concave cam structure is separated from the third concave cam structure, the second shaft end resistance iron presses the fourth concave cam structure under the action of the spring, the second concave cam structure is meshed with the fourth concave cam structure to provide a torque in a second direction, and the first direction and the second direction are opposite directions.

[0012] It should be noted that the phase difference between the third concave cam structure and the fourth concave cam structure can be understood as: the tension and tension concave cam frame is not a symmetrical structure in the direction perpendicular to the axis, but the third concave cam structure is rotated by a certain angle relative to the fourth concave cam structure, or the fourth concave cam structure is rotated by a certain angle relative to the third concave cam structure, so there is a certain angle difference (i.e., phase difference) between the third concave cam structure and the fourth concave cam structure.

[0013] In the embodiment of the present application, two pairs of first concave cam structures, second concave cam structures, third concave cam structures and fourth concave cam structures are provided, and the first concave cam structure and the third concave cam structure can form a first concave cam group, and the second concave cam structure and the fourth concave cam structure can form a second concave cam group, and the purpose of switching the direction of the closing / unfolding holding force is achieved by alternately meshing the first concave cam group and the second concave cam group. In other words, the shaft assembly can provide torques in different directions under different states, and can switch the direction of the closing / unfolding holding force, so that the user will not feel difficulty in opening the first shell and the second shell of the foldable electronic device due to the existence of a force contrary to the operation intention, but can provide assistance consistent with the intended action direction, thereby improving the user's use experience.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the torque reversing mechanism also includes a rotating shaft back plate and a rotating shaft bracket, and a semi-enclosed space is formed between the rotating shaft back plate and the rotating shaft bracket, and the semi-enclosed space is used to accommodate the arc arm, the tension and loose concave cam frame, the first shaft end block iron, the second shaft end block iron and the spring.

[0015] In an embodiment of the present application, the shaft back plate and the shaft bracket can be fixedly connected, and the two together form a semi-enclosed space to enclose the core motion mechanism, that is, the semi-enclosed space can be used to accommodate the arc arm, the tension and loose concave cam frame, the first shaft end block iron, the second shaft end block iron and the spring, thereby protecting the core motion mechanism.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the torque reversing mechanism also includes a retaining spring, the middle part of which is fixedly connected to the back plate of the rotating shaft, and the two ends of the retaining spring can undergo elastic deformation; a first retaining groove and a second retaining groove are provided on the side of the connecting portion of the tensioning and relaxing concave cam frame close to the back plate of the rotating shaft, and the first retaining groove and the second retaining groove are respectively used to retain the first end and the second end of the retaining spring; wherein, in the first state, the second end of the retaining spring is retained in the second retaining groove to prevent the second concave cam structure and the fourth concave cam structure from approaching each other, and the first end of the retaining spring rests on the tensioning and relaxing concave cam frame; in the second state, the first end of the retaining spring is retained in the first retaining groove to prevent the first concave cam structure and the third concave cam structure from approaching each other, and the second end of the retaining spring rests on the tensioning and relaxing concave cam frame.

[0017] In the embodiment of the present application, by providing a retaining spring, stability under different torque direction states can be maintained, that is, the retaining spring is used to effectively maintain a specific state, so that as long as the user does not actively trigger the state switch, the original state will be maintained.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the torque reversing mechanism also includes a paddle, on which a first baffle and a second baffle are arranged, the first baffle being located between the first shaft end block and the third concave cam structure, and the second baffle being located between the second shaft end block and the fourth concave cam structure; wherein, when the first state switches to the second state, the first baffle drives the first shaft end block to move in a direction away from the arc arm, and after the paddle pushes the second end of the retaining spring out of the second retaining groove, the second shaft end block drives the tensioning concave cam frame to move axially under the action of the spring, so that the second concave cam structure is close to the fourth concave cam structure, and the first concave cam structure is away from the third concave cam structure.

[0019] It should be noted that in the embodiment of the present application, a single reliable mechanical input such as a paddle or a push rod can be used, which can also be used as an input interface of an electrical control component to systematically solve the control problem of state switching.

[0020] In the embodiment of the present application, the torque reversal of the foldable electronic device can be achieved by moving the paddle, that is, the torque direction is changed, so that the foldable electronic device tends to be unfolded or closed. The whole process has a single input, is simple, easy to operate, fast and reliable.

[0021] In combination with the first aspect, in some implementations of the first aspect, a protrusion protruding toward the back plate of the shaft is provided on the paddle, and a through groove is provided at a position on the back plate of the shaft corresponding to the protrusion, and the protrusion can pass through the through groove.

[0022] In the embodiment of the present application, a protrusion is provided on the paddle, and the protrusion can pass through the back plate of the shaft, so that the user can directly contact the protrusion, and the torque state can be switched by moving the protrusion.

[0023] In combination with the first aspect, in certain implementations of the first aspect, a boss is provided on the arc arm, and the boss is fixedly connected to the middle frame of the foldable electronic device, so that the arc arm can rotate around the axis.

[0024] In the embodiment of the present application, the boss provided on the arc arm can be fixedly connected to the middle frame of the foldable electronic device, so that the arc arm can rotate synchronously with the middle frame around the axis.

[0025] In combination with the first aspect, in certain implementations of the first aspect, a first fixing hole is provided on the first shaft end resistance iron, and a second fixing hole is provided on the second shaft end resistance iron, the first fixing hole is used to be fixedly connected to the first end of the spring, and the second fixing hole is used to be fixedly connected to the second end of the spring.

[0026] In the embodiment of the present application, a fixing hole is provided on the shaft end stop to achieve a fixed connection between the spring and the shaft end stop. Of course, other components may also be provided on the shaft end stop as long as a fixed connection between the spring and the shaft end stop can be achieved.

[0027] In a second aspect, a rotating shaft assembly is provided, the rotating shaft assembly comprising a pair of torque reversing mechanisms, each torque reversing mechanism comprising: an arc arm, a tension concave cam frame, a first shaft end blocker, a second shaft end blocker and a spring, wherein:

[0028] A semi-enclosed space is formed between the rotating shaft back plate and the rotating shaft bracket, and the semi-enclosed space is used to accommodate the arc arm, the tension concave cam frame, the first shaft end blocker, the second shaft end blocker and the spring;

[0029] A first concave cam structure and a second concave cam structure are respectively provided at both ends of the arc arm, the first concave cam structure and the second concave cam structure are arranged along the axial direction, and the first concave cam structure and the second concave cam structure are symmetrically arranged along a direction perpendicular to the axis;

[0030] The tension concave cam frame comprises a third concave cam structure, a fourth concave cam structure and a connecting portion connected between the third concave cam structure and the fourth concave cam structure, the connecting portion is provided with a groove, the groove can accommodate part of the arc arm, the third concave cam structure and the fourth concave cam structure are arranged along the axial direction, and there is a phase difference between the third concave cam structure and the fourth concave cam structure;

[0031] The arc arm is a hollow structure, the first concave cam structure has a first through hole, the second concave cam structure has a second through hole, the third concave cam structure has a third through hole, and the fourth concave cam structure has a fourth through hole. The spring is inserted through the arc arm, the first through hole, the second through hole, the third through hole and the fourth through hole, and the two ends of the spring are fixedly connected with the first shaft end resistance iron and the second shaft end resistance iron respectively;

[0032] The arc arm comprises a main body, a first shaft shoulder and a second shaft shoulder, wherein the first shaft shoulder is arranged on a side of the main body close to the first concave cam structure, and the second shaft shoulder is arranged on a side of the main body close to the third concave cam structure;

[0033] The first shaft end resistance iron comprises a first stopper, and the second shaft end resistance iron comprises a second stopper, the first stopper can abut on the first shaft shoulder, and the second stopper can abut on the second shaft shoulder;

[0034] In the first state, the second concave cam structure is separated from the fourth concave cam structure, and the second stopper on the second shaft end block presses the second shaft shoulder on the arc arm under the action of the spring, so that the first concave cam structure is meshed with the third concave cam structure to provide a torque in a first direction;

[0035] In the second state, the first concave cam structure is separated from the third concave cam structure, and the first stop block on the first shaft end block presses the first shaft shoulder on the arc arm under the action of the spring, so that the second concave cam structure is engaged with the fourth concave cam structure to provide a torque in a second direction, and the first direction and the second direction are opposite directions.

[0036] It should be noted that the phase difference between the third concave cam structure and the fourth concave cam structure can be understood as: the tension and tension concave cam frame is not a symmetrical structure in the direction perpendicular to the axis, but the third concave cam structure is rotated by a certain angle relative to the fourth concave cam structure, or the fourth concave cam structure is rotated by a certain angle relative to the third concave cam structure, so there is a certain angle difference (i.e., phase difference) between the third concave cam structure and the fourth concave cam structure.

[0037] In the embodiment of the present application, two pairs of first concave cam structures, second concave cam structures, third concave cam structures and fourth concave cam structures are provided, and the first concave cam structure and the third concave cam structure can form a first concave cam group, and the second concave cam structure and the fourth concave cam structure can form a second concave cam group, and the purpose of switching the direction of the closing / unfolding holding force is achieved by alternately meshing the first concave cam group and the second concave cam group. In other words, the shaft assembly can provide torques in different directions under different states, and can switch the direction of the closing / unfolding holding force, so that the user will not feel difficulty in opening the first shell and the second shell of the foldable electronic device due to the existence of a force contrary to the operation intention, but can provide assistance consistent with the intended action direction, thereby improving the user's use experience.

[0038] In combination with the second aspect, in certain implementations of the second aspect, the torque reversing mechanism also includes a rotating shaft back plate and a rotating shaft bracket, and a semi-enclosed space is formed between the rotating shaft back plate and the rotating shaft bracket, and the semi-enclosed space is used to accommodate the arc arm, the tension and loose concave cam frame, the first shaft end resistance iron, the second shaft end resistance iron and the spring.

[0039] In an embodiment of the present application, the shaft back plate and the shaft bracket can be fixedly connected, and the two together form a semi-enclosed space to enclose the core motion mechanism, that is, the semi-enclosed space can be used to accommodate the arc arm, the tension and loose concave cam frame, the first shaft end block iron, the second shaft end block iron and the spring, thereby protecting the core motion mechanism.

[0040] In combination with the second aspect, in certain implementations of the second aspect, the torque reversing mechanism also includes a retaining spring, the middle part of the retaining spring is fixedly connected to the back plate of the rotating shaft, and the two ends of the retaining spring can undergo elastic deformation; a first slide groove and a second slide groove are arranged along the circumferential direction of the arc arm, the first slide groove is arranged on the side of the main part close to the first concave cam structure, and the second slide groove is arranged on the side of the main part close to the second concave cam structure, and the first slide groove and the second slide groove are used to clamp the first end and the second end of the retaining spring respectively; wherein, in the first state, the second end of the retaining spring is clamped in the second slide groove to prevent the second concave cam structure and the fourth concave cam structure from approaching each other, and the first end of the retaining spring rests on the arc arm; in the second state, the first end of the retaining spring is clamped in the first slide groove to prevent the first concave cam structure and the third concave cam structure from approaching each other, and the second end of the retaining spring rests on the arc arm.

[0041] In the embodiment of the present application, by providing a retaining spring, stability under different torque direction states can be maintained, that is, the retaining spring is used to effectively maintain a specific state, so that as long as the user does not actively trigger the state switch, the original state will be maintained.

[0042] In combination with the second aspect, in certain implementations of the second aspect, the torque reversing mechanism also includes a paddle, on which a first baffle and a second baffle are arranged, the first baffle being located between the arc arm and the first concave cam structure, and the second baffle being located between the arc arm and the second concave cam structure; wherein, when the first state switches to the second state, the second baffle drives the second shaft end block to move in a direction away from the arc arm, and after the paddle pushes the second end of the retaining spring out of the second slide groove, the first block moves axially against the first shaft shoulder of the arc arm under the action of the spring, so that the second concave cam structure is close to the fourth concave cam structure, and the first concave cam structure is away from the third concave cam structure.

[0043] It should be noted that in the embodiment of the present application, a single reliable mechanical input such as a paddle or a push rod can be used, which can also be used as an input interface of an electrical control component to systematically solve the control problem of state switching.

[0044] In the embodiment of the present application, the torque reversal of the foldable electronic device can be achieved by moving the paddle, that is, the torque direction is changed, so that the foldable electronic device tends to be unfolded or closed. The whole process has a single input, is simple, easy to operate, fast and reliable.

[0045] In combination with the second aspect, in some implementations of the second aspect, a protrusion protruding toward the back plate of the shaft is provided on the paddle, and a through groove is provided at a position on the back plate of the shaft corresponding to the protrusion, and the protrusion can pass through the through groove.

[0046] In the embodiment of the present application, a protrusion is provided on the paddle, and the protrusion can pass through the back plate of the shaft, so that the user can directly contact the protrusion, and the torque state can be switched by moving the protrusion.

[0047] In combination with the second aspect, in certain implementations of the second aspect, a boss is provided on the arc arm, and the boss is fixedly connected to the middle frame of the foldable electronic device, so that the arc arm can rotate around the axis.

[0048] In the embodiment of the present application, the boss provided on the arc arm can be fixedly connected to the middle frame of the foldable electronic device, so that the arc arm can rotate synchronously with the middle frame around the axis.

[0049] In combination with the second aspect, in certain implementations of the second aspect, a first fixing hole is provided on the first shaft end resistance iron, and a second fixing hole is provided on the second shaft end resistance iron, the first fixing hole is used to be fixedly connected to the first end of the spring, and the second fixing hole is used to be fixedly connected to the second end of the spring.

[0050] In the embodiment of the present application, a fixing hole is provided on the shaft end stop to achieve a fixed connection between the spring and the shaft end stop. Of course, other components may also be provided on the shaft end stop as long as a fixed connection between the spring and the shaft end stop can be achieved.

[0051] In a third aspect, a foldable electronic device is provided, comprising: a first shell; a second shell; the hinge assembly described in the first aspect and any implementation of the first aspect, or the hinge assembly described in the second aspect and any implementation of the second aspect; the hinge assembly is connected between the first shell and the second shell.

[0052] In combination with the third aspect, in some implementations of the third aspect, the foldable electronic device also includes a foldable display screen, the foldable display screen includes a first display portion and a second display portion, the first display portion is connected to the first shell, and the second display portion is connected to the second shell.

[0053] It should be noted that the beneficial effects of the third aspect can refer to the beneficial effects of the first aspect or the second aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the structure of a foldable electronic device provided in an embodiment of the present application.

[0055] Figure 2 It is a structural schematic diagram of the torque reversing mechanism provided in an embodiment of the present application.

[0056] Figure 3 It is a partial structural schematic diagram of the torque reversing mechanism provided in an embodiment of the present application.

[0057] Figure 4 It is a partial structural schematic diagram of the torque reversing mechanism provided in an embodiment of the present application.

[0058] Figure 5 It is a partial structural schematic diagram of the torque reversing mechanism provided in an embodiment of the present application.

[0059] Figure 6 It is a schematic diagram of the unfolding and closing of the foldable electronic device provided in an embodiment of the present application.

[0060] Figure 7 It is a schematic diagram of the process of switching direction of the torque reversing mechanism provided in an embodiment of the present application.

[0061] Figure 8 It is a schematic diagram of the process of switching direction of the torque reversing mechanism provided in an embodiment of the present application.

[0062] Fig. 9 It is a schematic diagram of the structure of the arc arm provided in an embodiment of the present application.

[0063] Fig.10 It is a schematic diagram of the structure of the torque reversing mechanism provided in the embodiment of the present application in different states. DETAILED DESCRIPTION

[0064] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0065] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can include one or more features sensibly or implicitly. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two, and "at least one" and "one or more" refer to one, two or more. The singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context. The size of the sequence number of each process below does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. For example, in the embodiments of the present application, the words "100", "200", "300" and the like are only marks made for the convenience of description, and do not limit the order of execution steps.

[0066] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0067] In the description of the embodiments of the present application, the directions or positional relationships indicated by the terms "upper", "lower", "inside", "outside", etc. are defined relative to the directions or positions of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, rather than indicating or implying that the device or component referred to must have a specific direction, or be constructed and operated in a specific direction. They may change accordingly according to the changes in the directions of the components placed in the drawings, and therefore cannot be understood as limitations on the present application.

[0068] In order to facilitate the description of each embodiment below, an xyz coordinate system is established for the foldable electronic device in the unfolded state, and the axis direction of the foldable electronic device is defined as the x direction, and the y direction and the z direction are perpendicular to the axis direction of the foldable electronic device, wherein the z direction may be the thickness direction of the foldable electronic device. It is understandable that the coordinate system setting of the foldable electronic device can be flexibly set according to actual needs, and is not specifically limited here.

[0069] Figure 1 1 is a schematic diagram of a foldable electronic device 10 provided in an embodiment of the present application. The foldable electronic device 10 may be a mobile phone, a tablet computer, an e-reader, a laptop computer, a wearable device, or other electronic device with a folding function. Figure 1 The illustrated embodiment is described by taking a foldable mobile phone as an example.

[0070] refer to Figure 1 The foldable electronic device 10 may include a flexible display screen (not shown in the figure), a first shell 100, a second shell 200 and a hinge assembly 300.

[0071] Among them, the flexible display screen is arranged above the first shell 100, the second shell 200 and the hinge assembly 300, and the first shell 100, the second shell 200 and the hinge assembly 300 can be used to support the flexible display screen. It should be understood that the flexible display screen can have the characteristics of strong flexibility and bendability, and can provide users with a new interactive mode based on the bendable characteristics. The display panel of the flexible display screen can, for example, adopt any one of a liquid crystal flexible display screen (liquid crystal display, LCD), an organic light-emitting diode (organic light-emitting diode, OLED), an active matrix organic light-emitting diode or an active matrix organic light-emitting diode (active-matrix organic light emitting diode, AMOLED), a flexible light-emitting diode (flex light-emitting diode, FLED), a quantum dot light emitting diode (quantum dot light emitting diodes, QLED), etc., and the embodiments of the present application are not limited to this.

[0072] The flexible display screen may include a first display portion corresponding to the first housing 100, a second display portion corresponding to the second housing 200, and a foldable display portion corresponding to the hinge assembly 300. The foldable display portion may be connected between the first display portion and the second display portion.

[0073] The first housing 100 may be composed of a first side frame and a first cover body, and the first side frame may surround the outer periphery of the first cover body and the outer periphery of the first display portion. The first display portion may be arranged parallel to the first cover body and spaced apart, and the first display portion and the first cover body may be located on both sides of the first side frame. The space between the first display portion and the first cover body may be used to arrange components of the foldable electronic device 10, such as an antenna, a circuit board assembly, etc.

[0074] The second housing 200 may be composed of a second side frame and a second cover body, and the second side frame may surround the outer periphery of the second cover body and the outer periphery of the second display portion. The second display portion may be arranged parallel to the second cover body and spaced apart, and the second display portion and the second cover body may be located on both sides of the second side frame. The space between the second display portion and the second cover body may be used to set components of the foldable electronic device 10, such as an antenna, a circuit board assembly, etc.

[0075] In one embodiment provided in the present application, the cover body and the side frame may be two parts of the shell of the foldable electronic device 10, and the cover body and the side frame may be connected, and the form of the connection may not belong to assembly methods such as snap-on, gluing, welding, riveting, clearance fit, etc. The connection relationship between the cover body and the side frame is usually difficult to separate. In another embodiment provided in the present application, the cover body and the side frame may be two different components. By assembling the cover body and the side frame together, the shell of the foldable electronic device 10 can be formed.

[0076] The hinge assembly 300 can be connected between the first housing 100 and the second housing 200. The foldable display portion of the flexible display screen can abut against the surface of the hinge assembly 300. When the foldable electronic device 10 is in the unfolded state, the foldable display portion of the flexible display screen and the hinge assembly 300 are stacked. Under the action of the hinge assembly 300, the first housing 100 and the second housing 200 can be close to each other or away from each other. Accordingly, the first display portion of the flexible display screen and the second display portion of the flexible display screen can be close to each other or away from each other, so that the flexible display screen can be folded or unfolded, that is, the foldable electronic device 10 is in the folded state or the unfolded state.

[0077] In the present application, when the foldable electronic device 10 is in an unfolded state (flattened state), the angle between the first shell 100 and the second shell 200 can be about 180°. The foldable electronic device 10 being in a folded state can mean that the foldable electronic device 10 is currently bent, and the bending degree of the foldable electronic device 10 reaches the maximum. At this time, the first cover body and the second cover body can be parallel to each other, spaced from each other, and arranged face to face, and the spacing distance between the first cover body and the second cover body is the smallest, and at least part of the first shell 100 and the second shell 200 are accommodated in the space surrounded by the flexible display screen; the first display part, the first shell 100, the second shell 200, and the second display part are stacked in sequence. Similarly, the first display part and the second display part can be parallel to each other, spaced from each other, and arranged face to face (the spacing distance between the first cover body and the second cover body is less than the spacing distance between the first display part and the second display part). At this time, the first display part and the second display part can be regarded as being located on different planes.

[0078] The foldable electronic device 10 being in a folded state may include the foldable electronic device 10 being in an inward folded state, or the foldable electronic device 10 being in an outward folded state. Wherein, when the foldable electronic device 10 is in an inward folded state, the first cover body and the second cover body may be close to each other, and the first display part and the second display part may be close to each other. The first cover body, the second cover body and the hinge assembly 300 may form a screen area for accommodating a flexible display screen. That is, the flexible display screen may be accommodated in the interval between the first cover body and the second cover body. When the foldable electronic device 10 is in an outward folded state, the first cover body and the second cover body may be close to each other, and the first display part and the second display part may be close to each other. The first display part, the second display part and the foldable display part may form a housing area for accommodating the first cover body, the second cover body and the hinge assembly 300. That is, the first cover body, the second cover body and the hinge assembly 300 may be accommodated in the interval between the first display part and the second display part.

[0079] It is understandable that, whether the foldable electronic device 10 is in the inward folding state or the outward folding state, the foldable electronic device 10 needs a closing holding force to maintain its closed state and the hand feeling during the closing process when it is closed. A common solution at present is to use one or a pair of concave cams or inclined surfaces of the rotating shaft compressed by a spring to maintain the closing force torque, and to assist with the maintenance of the compressed state with magnets. However, whether it is a single concave cam or inclined surface solution, it can only apply a single direction of torque when the foldable electronic device 10 is in a position (or angle) that is almost closed, even if the first shell 100 and the second shell 200 tend to the direction of closing. However, this single torque that keeps the foldable electronic device 10 in a closed state may affect the user's unfolding feel when the user unfolds the foldable electronic device 10 due to excessive closing force. Excessive closing force will cause additional resistance when the user opens the foldable electronic device 10, making the initial process of unfolding the foldable electronic device 10 very difficult.

[0080] Therefore, in response to the current problem that the direction of the closing force cannot be adjusted, the embodiments of the present application provide a hinge assembly and a foldable electronic device, which can adjust the direction of the closing force (or closing torque) of the foldable electronic device, so that when the user unfolds or closes the foldable electronic device, a pre-opening force or a pre-closing force can be provided to assist the unfolding or closing of the foldable electronic device, thereby avoiding affecting the unfolding or closing of the foldable electronic device and improving the user experience.

[0081] Continue to refer Figure 1 The rotating shaft assembly 300 provided in the embodiment of the present application may include a main shaft 400 and a pair of torque reversing mechanisms 500 (i.e., a torque reversing mechanism 500A and a torque reversing mechanism 500B). The main shaft 400 is fixedly connected to the torque reversing mechanism 500. The torque reversing mechanism 500 can be used to convert the torque in a first direction when the rotating shaft assembly 300 rotates into a torque in a second direction, wherein the first direction and the second direction are opposite directions. For example, the first direction can be an expansion direction, and the second direction can be a closing direction.

[0082] The following will be combined Figures 2 to 5 , each component of the torque reversing mechanism 500 of the embodiment of the present application and the connection relationship between the components are described. In addition, since the components in each torque reversing mechanism 500 are the same, for the convenience and simplicity of description, the torque reversing mechanism 500A is mainly used as an example to illustrate the various components in the torque reversing mechanism.

[0083] It should be understood that Figures 2 to 5 The torque reversing mechanism and the schematic structural diagrams of the various components shown are schematic illustrations, and any modified implementation or connection method is within the protection scope of the embodiments of the present application.

[0084] refer to Figure 2 and Figure 3 It can be known that the torque reversing mechanism 500 may include a torque reversing mechanism 500A and a torque reversing mechanism 500B, and the torque reversing mechanism 500A and the torque reversing mechanism 500B are centrally symmetrical about the center of the rotating shaft. The torque reversing mechanism 500 may include two rotating shaft back plates 510, two rotating shaft brackets 520 corresponding to the two rotating shaft back plates 510, a pair of arc arms 530, a pair of loose and tight concave cam frames 540, two pairs of shaft end resistance irons 550, two springs 560, a pair of retaining springs 570 and a pair of paddles 580. That is, the torque reversing mechanism 500A may include a shaft back plate 510A, a shaft support 520A corresponding to the shaft back plate 510A, an arc arm 530A, a tension concave cam frame 540A, a shaft end blocker 550A-1, a shaft end blocker 550A-2, a spring 560A, a retaining spring 570A and a paddle 580A; the torque reversing mechanism 500B may include a shaft back plate 510B, a shaft support 520B corresponding to the shaft back plate 510B, an arc arm 530B, a tension concave cam frame 540B, a shaft end blocker 550B-1, a shaft end blocker 550B-2, a spring 560B, a retaining spring 570B and a paddle 580B. Figures 2 to 5 The various components of the torque reversing mechanism 500 are described in detail.

[0085] Rotating shaft back plate 510

[0086] The structure of the rotating shaft back plate 510 can refer to Figure 3 and Figure 4 The hinge back plate 510 may include a hinge back plate 510A and a hinge back plate 510B, and the hinge back plate 510A and the hinge back plate 510B may be arranged side by side along the y direction, and the side of the hinge back plate 510 away from the hinge bracket 520 is fixedly connected to the main shaft 300, wherein the y direction is a direction perpendicular to the axis of the foldable electronic device 10.

[0087] In some embodiments, the shaft back plate 510 may be provided with a through slot, which may be used to accommodate the protrusion on the paddle 580, that is, the protrusion on the paddle 580 may pass through the through slot. Figure 4 As shown, a through slot 511A may be provided on the shaft back plate 510A, and the protrusion 581A on the paddle 580A may pass through the through slot 511A.

[0088] Shaft bracket 520

[0089] The structure of the rotating shaft support 520 can refer to Figure 2 and Figure 4The pivot bracket 520 may include a pivot bracket 520A and a pivot bracket 520B. The pivot bracket 520A and the pivot bracket 520B may be arranged side by side along the y direction, and the pivot bracket 520A corresponds to the pivot back plate 510A, and the pivot bracket 520B corresponds to the pivot back plate 510B.

[0090] In some embodiments, the shaft bracket 520 is fixedly connected to the shaft back cover 510, and the two together form a semi-enclosed space to enclose the core motion mechanism, that is, the semi-enclosed space can be used to accommodate the arc arm 530, the tension concave cam frame 540, the shaft end blocker 550 and the spring 560. Exemplarily, the shaft bracket 520 is a semi-arc structure, and the semi-arc structure of the shaft bracket 520 and the shaft back plate 510 can form a semi-enclosed accommodation space, and the accommodation space can accommodate other components of the torque reversing mechanism 500 (such as the tension concave cam frame 540, the shaft end blocker 550, the spring 560, etc.).

[0091] In some embodiments, the middle portion of the rotating shaft bracket 520 may be half hollowed out, and the hollowed out portion corresponds to the boss on the arc arm 530, so that the arc arm 530 can rotate around the axis. Figure 2 The torque reversing mechanism 500 shown in is a schematic diagram of the structure of the foldable electronic device 10 in a closed state, that is, when the foldable electronic device 10 is in a folded state, the boss on the arc arm 243 is parallel to the z direction, and when the foldable electronic device 10 is unfolded, the arc arm 530 will rotate to both sides along the hollowed-out area of ​​the pivot bracket 520, that is, the boss rotates around the x direction.

[0092] Arc Arm 530

[0093] The structure of the arc arm 530 can be referred to Figure 3 and Figure 5 The arc arm 530 can rotate around a direction perpendicular to the axis (ie, the y direction) and can be used to transmit a closing force or an opening force. The arc arm 530 can include an arc arm 530A and an arc arm 530B.

[0094] In some embodiments, the main body of the arc arm 530 can be a hollow cylindrical structure, and concave cam structures are respectively provided at both ends of the cylindrical structure, and the protrusions on the concave cam structure can abut against the recessed parts on the tension concave cam frame 540, and the recessed parts on the concave cam structure can abut against the protrusions on the tension concave cam frame 540. For example, the first concave cam structure and the second concave cam structure are respectively provided at both ends of the arc arm 530, and the first concave cam structure and the second concave cam structure are arranged along the axial direction, and the first concave cam structure and the second concave cam structure are symmetrically arranged along the direction perpendicular to the axis, that is, the first concave cam structure and the second concave cam structure are symmetrical about the y-axis. For example, Figure 5As shown, the two ends of the arc arm 530A may be provided with a concave cam structure 531A and a concave cam structure 532A, the arc arm 530A is a hollow structure, and the spring 560A can pass through the hollow part of the arc arm 530A. It can also be understood that the arc arm 530A is a hollow structure, the concave cam structure 531A has a first through hole (not shown in the figure), the concave cam structure 532A has a second through hole (not shown in the figure), and the spring 560A can pass through the hollow part of the arc arm 530A, the first through hole, and the second through hole.

[0095] In some embodiments, a boss may be provided on the main body of the arc arm 530, and a positioning hole may be provided on the boss, and the positioning hole may be fixedly connected to the first shell 100 or the second shell 200. For example, Figure 5 As shown, a boss 533A may be provided on the main part of the arc arm 530A, and a positioning hole may be provided on the boss 533A. The arc arm 530A may be fixedly connected to the first shell 100 or the second shell 200 through the positioning hole, so that the arc arm 530A can rotate around the axis following the first shell 100 or the second shell 200.

[0096] Elastic concave cam frame 540

[0097] The structure of the tension concave cam frame 540 can be referred to Figure 3 and Figure 5 The tensioning concave cam frame 540 includes a tensioning concave cam frame 540A and a tensioning concave cam frame 540B.

[0098] In some embodiments, the tension concave cam frame 540 may include a third concave cam structure, a fourth concave cam structure, and a connecting portion connected between the third concave cam structure and the fourth concave cam structure, and a groove is provided on the connecting portion, and the groove can be used to accommodate the arc arm 530. It should be understood that the length of the groove along the x direction is greater than the length of the arc arm 530 along the x direction, so that the concave cam structure on the arc arm 530 and the concave cam structure on the tension concave cam frame 540 are alternately engaged. It should also be understood that the third concave cam structure and the fourth concave cam structure can be arranged along the axial direction, and there is a phase difference between the third concave cam structure and the fourth concave cam structure, that is, in the direction perpendicular to the axis (i.e., the y direction), the tension concave cam frame 540 is not a symmetrical structure, but the third concave cam structure is rotated by a certain angle relative to the fourth concave cam structure, or the fourth concave cam structure is rotated by a certain angle relative to the third concave cam structure, so there is a certain angle difference (i.e., phase difference) between the third concave cam structure and the fourth concave cam structure.

[0099] It should be understood that a concave cam structure may be provided on one side of the arc arm 530 at both ends of the tensioning concave cam frame 540, and the recessed portion on the concave cam structure on the tensioning concave cam frame 540 may abut against the raised portion on the concave cam structure on the arc arm 530, and the raised portion on the concave cam frame structure on the tensioning concave cam frame 540 may abut against the recessed portion on the concave cam structure on the arc arm 530.

[0100] For example, Figure 5 As shown, a concave cam structure 541A and a concave cam structure 542A are provided on the tensioning concave cam frame 540A, and the concave cam structure 541A can be used in conjunction with the concave cam structure 531A on the arc arm, and the concave cam structure 542A can be used in conjunction with the concave cam structure 532A on the arc arm. That is to say, when the concave cam structure 541A abuts against the concave cam structure 531A, the recessed portion on the concave cam structure 541A can abut against the raised portion on the concave cam structure 531A, the raised portion on the concave cam structure 541A can abut against the recessed portion on the concave cam structure 531A, and the concave cam structure 542A is separated from the concave cam structure 532A; when the concave cam structure 542A abuts against the concave cam structure 532A, the recessed portion on the concave cam structure 542A can abut against the raised portion on the concave cam structure 532A, the raised portion on the concave cam structure 542A can abut against the recessed portion on the concave cam structure 532A, and the concave cam structure 541A is separated from the concave cam structure 531A.

[0101] In some embodiments, the concave cam structures at both ends of the tension concave cam frame 540 may be provided with through holes, so that the spring 560 can pass through the arc arm 530 and the tension concave cam frame 540 and be fixedly connected to the shaft end stopper 550. Figure 5 As shown, through holes 543A and through holes 544A are provided at both ends of the tension / relaxation concave cam frame 540A, and the spring 560A can pass through the arc arm 530A, the through hole 543A and the through hole 544A, and are respectively connected to the shaft end resistance iron 550A-1 and the shaft end resistance iron 550A-2 at both ends.

[0102] In some embodiments, two slots may be provided at the bottom of both ends of the tensioning concave cam frame 540 close to the rotating shaft back plate 510, and the slots may be used to clamp the clamping spring 570. Figure 5 As shown, the tensioning cam frame 540 may be provided with a slot 545A and a slot 546A. In one example, the slot 545A may be used to clamp the first end of the retaining spring 570A, and the second end of the retaining spring 570A may not be clamped in the slot 546A. In another example, the slot 546A may be used to clamp the second end of the retaining spring 570A, and the first end of the retaining spring 570A may not be clamped in the slot 545A.

[0103] It should be noted that the middle of the tension concave cam frame 540 can be half-hollowed out so that the middle of the tension concave cam frame 540 can accommodate the main part of the arc arm 530. In other words, a groove is provided in the middle of the tension concave cam frame 540, and the groove can be used to accommodate the arc arm 530. The arc arm 530 can move in the groove. When one end of the arc arm 530 contacts one end of the tension concave cam frame 540, the other end of the arc arm 530 does not contact the other end of the tension concave cam frame 540.

[0104] Shaft end stopper 550

[0105] The structure of the shaft end resistance iron 550 can refer to Figure 4 and Figure 5 There are two pairs of shaft end resistance irons 550, which may include a pair of shaft end resistance irons 550A and a pair of shaft end resistance irons 550B in the torque reversing mechanism 500. Exemplarily, the torque reversing mechanism 500A may include a pair of shaft end resistance irons 550A (i.e., shaft end resistance irons 550A-1 and shaft end resistance irons 550A-2), and the shaft end resistance irons 550A-1 and the shaft end resistance irons 550A-2 are respectively arranged at two ends of the tension and relaxation concave cam frame 540A away from the arc arm 530A.

[0106] It is understandable that the shaft end blocker 550 can move along the shaft but not rotate around the shaft. The two ends of the spring 560A can be fixedly connected to the shaft end blocker 550A-1 and the shaft end blocker 550A-2 respectively, so that the elastic force of the spring 560A can pull the shaft end blocker 550A to move along the axial direction.

[0107] In some embodiments, the shaft end stopper 550 may be provided with a fixing hole, and the fixing hole may be used to fix the spring 560. For example, Figure 5 As shown, a fixing hole 551A-1 is provided on the shaft end resistance iron 550A-1, and a fixing hole 551A-2 is provided on the shaft end resistance iron 550A-2. One end of the spring 560A can be connected to the fixing hole 551A-1, and the other end of the spring 560A can be connected to the fixing hole 551A-2.

[0108] In some embodiments, a baffle may be provided on the shaft end stopper 550, such as Figure 5 As shown, a baffle 552A-1 is provided on the side of the shaft end resistance iron 550A-1 facing the shaft back plate 510A, and a baffle 552A-2 is provided on the side of the shaft end resistance iron 550A-2 facing the shaft back plate 510A. Figure 4It can be seen that the baffle 552A-1 and the baffle 552A-2 can be used in conjunction with the baffle 582A and the baffle 583A on the paddle 580 respectively, that is, the baffle 582A on the paddle 580 can push the baffle 552A-1 on the shaft end block 550A-1 to move axially, or the baffle 583A on the paddle 580 can push the baffle 552A-2 on the shaft end block 550A-2 to move axially.

[0109] Spring 560

[0110] The structure of spring 560 can be referred to Figure 3 and Figure 5 The spring 560 may include a spring 560A and a spring 560B. Both ends of the spring 560 are fixedly connected to the shaft end resistance irons 550 at both ends.

[0111] For example, Figure 5 As shown, the spring 560A can pass through the arc arm 530A and the tension concave cam frame 540A, and be fixedly connected to the shaft end blocker 550A. That is, the first end of the spring 560A can be fixedly connected to the fixing hole 551A-1 on the shaft end blocker 550A-1, and the second end of the spring 560A can be fixedly connected to the fixing hole 551A-2 on the shaft end blocker 550A-2. It should be understood that in the embodiment of the present application, the spring 560 is in a stretched state.

[0112] Circlip 570

[0113] The structure of the circlip 570 can be referred to Figure 3 and Figure 5 The retaining spring 570 may include a retaining spring 570A and a retaining spring 570B, and the middle portion of the retaining spring 570 may be fixedly connected to the shaft back plate 510 , and both ends of the retaining spring 570 may be elastically deformed.

[0114] like Figure 5 As shown, in one example, the first end of the retaining spring 570A may be engaged with the retaining groove 545A on the tensioning concave cam frame 540A, and the second end of the retaining spring 570A may not be engaged with the retaining groove 546A. In another example, the second end of the retaining spring 570A may be engaged with the retaining groove 546A on the tensioning concave cam frame 540A, and the first end of the retaining spring 570A may not be engaged with the retaining groove 545A.

[0115] Pick 580

[0116] The structure of the paddle 580 can be referred to Figure 4 and Figure 5The paddle 580 may include a paddle 580A and a paddle 580B, and a protrusion may be provided on a side of the paddle 580 away from the hinge bracket 520 , and the protrusion 581A may pass through the through slot 511A on the hinge back plate 510A.

[0117] In some embodiments, Figure 4 As shown, a protrusion 581A is provided on the paddle 580A, and the protrusion 581A can pass through the shaft back plate 510A and the main shaft 400, so that the user can drive the paddle 580A to move by moving the protrusion 581A. The paddle 580A can drive the movement of the shaft end block 550A, thereby driving the movement of the tension and release cam frame 540A, and further changing the direction of the rotational torque.

[0118] In some embodiments, Figure 4 As shown, baffles 582A and 583A can be set at both ends of the paddle 580A, and the baffles 582A and 583A are set toward the rotating shaft bracket 520A. The baffle 582A can be located between the shaft end block iron 550A-1 and the tensioning concave cam frame 540A, and the baffle 583A can be located between the shaft end block iron 550A-2 and the tensioning concave cam frame 540A.

[0119] In one example, when the user moves the protrusion 581A on the paddle 580A, the protrusion 581A can drive the movement of the baffle 582A and the baffle 583A, that is, the paddle 580A moves as a whole. In addition, since the baffle 582A and the baffle 583A are located between the shaft end sear 550A and the tension concave cam frame 540A, the baffle 582A and the baffle 583A can drive the shaft end sear 550A to move axially.

[0120] The above combined with Figure 2 To Attachment Figure 5 The structure of a possible torque reversing mechanism 500 provided in the embodiment of the present application is introduced. Figure 6 To Attachment Figure 8 How the torque reversing mechanism 500 changes the direction of torque during operation is described in detail.

[0121] It should be noted that in the embodiment of the present application, the user can determine whether to switch the torque direction according to his or her own needs. On the one hand, when the user does not input any external action, the torque reversing mechanism 500 can maintain a torque output in a fixed direction. On the other hand, when the user needs to perform torque reversal, the paddle 580 can be slid for a period of time, and the torque reversing mechanism 500 moves, so that the torque in the first direction can be switched to the torque in the second direction. The first direction and the second direction are opposite directions. For example, the first direction can be an expansion direction, and the second direction can be a closing direction.

[0122] like Figure 6 As shown, if the paddle 580 is at the lower end in the initial state, the torque shows that the foldable electronic device 10 shows a tendency to close; when the user moves the paddle 580 upward, the torque direction can be switched, so that the torque direction changes, and the foldable electronic device shows a tendency to unfold. The whole process has a single input, is simple, easy, fast and reliable.

[0123] Figure 7 and Figure 8 The figure shows the positional relationship between the components of the torque reversing mechanism 500 during the torque reversing process. Figure 7 (a) and Figure 8 (a) is a cross-sectional schematic diagram and a three-dimensional structural diagram of each component of the torque reversing mechanism 500 when it is in the initial position (i.e., no torque switching is performed), Figure 7 (b) and Figure 8 (b) is a cross-sectional schematic diagram and a three-dimensional structural diagram of each component of the torque reversing mechanism 500 when it is in a transition position (i.e., torque switching is being performed). Figure 7 (c) and Figure 8 (c) is a cross-sectional schematic diagram and a three-dimensional structural diagram of the various components of the torque reversing mechanism 500 at the end position (i.e. after the torque switching is completed).

[0124] Combination Figure 7 (a) and Figure 8 As shown in (a), in the initial stage, the concave cam group on the upper side is pressed together, and the concave cam group on the lower side is disengaged, that is, the concave cam structure 541A of the tension concave cam frame 540A is engaged with the concave cam structure 531A of the arc arm 530A, and the concave cam structure 542A of the tension concave cam frame 540A is separated from the concave cam structure 532A of the arc arm 530A, and the concave cam structure 541A and the concave cam structure 531A can form a first concave cam group, and the concave cam structure 542A and the concave cam structure 532A can form a second concave cam group. In this case, the concave cam structure 541A will squeeze the concave cam structure 531A under the action of the spring 560A, thereby generating a torque in the first direction.

[0125] It can be understood that, in the first state, the second concave cam structure (i.e., the concave cam structure 532A) is separated from the fourth concave cam structure (i.e., the concave cam structure 542A), the first shaft end resistance iron (i.e., the shaft end resistance iron 550A-1) is pressed against the third concave cam structure (i.e., the concave cam structure 541A) under the action of the spring 560A, and the first concave cam structure (i.e., the concave cam structure 531A) is meshed with the third concave cam structure (i.e., the concave cam structure 541A) to provide a torque in a first direction. The first direction may be a closing direction.

[0126] For example, Figure 7As shown in (a), the first concave cam group gives the arc arm 530A a torque to the right, such as a torque in the closing direction. At this time, the end of the retaining spring 570A close to the shaft end blocker 550A-2 is stuck in the slot 546A on the tensioning concave cam frame 540A, preventing the tensioning concave cam frame 540A from moving axially, that is, preventing the concave cam structure 541A from separating from the concave cam structure 531A, and maintaining the first state. At this time, the end of the retaining spring 570A close to the shaft end blocker 550A-1 is in a free state and can be placed on the tensioning concave cam frame 540A.

[0127] That is to say, in the first state, the second end of the retaining spring 570A can be clamped in the second clamping groove 546A to prevent the second concave cam structure (i.e., the concave cam structure 532A) and the fourth concave cam structure (i.e., the concave cam structure 542A) from approaching each other, and the first end of the retaining spring 570A rests on the tensioning concave cam frame 540A.

[0128] Combination Figure 7 (b) and Figure 8 As can be seen from (b), in the transition stage, if the user moves the protrusion 581A on the paddle 580A upward (i.e., along the positive direction of the x-axis), the paddle 580A will move upward. For example, the paddle 580A can be driven by other external forces (such as a linear motor, etc.) to move upward.

[0129] In this case, the baffle 582A on the paddle 580A can lift the baffle 552A-1 on the shaft end block 550A-1, so that the shaft end block 550A-1 moves away from the arc arm 530A, and the baffle 583A on the paddle 580A will approach the concave cam structure 542A of the tension concave cam frame 540A, so that the lower side slope of the paddle 580A will pull the retaining spring 570A out of the slot 542A on the lower side of the tension concave cam frame 540A. 46A is ejected; after the retaining spring 570A is completely ejected from the retaining groove 546A, the tensioning cam frame 540A is not constrained in the axial direction, so that under the traction of the spring 560A, the shaft end resistance iron 550A-2 moves axially against the tensioning cam frame 540A, so that the concave cam structure 542A and the concave cam structure 532A are close to each other, and the concave cam structure 541A and the concave cam structure 531A are separated, that is, they can move upward under the traction of the spring 560A.

[0130] It can be understood that when the first state switches to the second state, the first baffle (i.e., 582A) on the paddle 580A drives the first shaft end blocker (i.e., shaft end blocker 550A-1) to move in the direction away from the arc arm 530A. After the paddle 580A pushes the second end of the retaining spring 570A out of the second retaining groove 546A, the second shaft end blocker (i.e., shaft end blocker 550A-2) drives the tension and release concave cam frame 540A to move axially under the action of the spring 560A, so that the second concave cam structure (i.e., concave cam structure 532A) and the fourth concave cam structure (i.e., concave cam structure 542A) are close to each other, and the first concave cam structure (i.e., concave cam structure 531A) and the third concave cam structure (i.e., concave cam structure 541A) are away from each other.

[0131] Combination Figure 7 (c) and Figure 8 As shown in (c), after the switching of the torque direction is completed, the concave cam group on the lower side is pressed together, and the concave cam group on the upper side is disengaged, that is, the concave cam structure 542A of the tension concave cam frame 540A is engaged with the concave cam structure 532A of the arc arm 530A, and the concave cam structure 541A of the tension concave cam frame 540A is separated from the concave cam structure 531A of the arc arm 530A. In this case, the concave cam structure 542A will squeeze the concave cam structure 532A under the action of the spring 560A, thereby generating a torque in the second direction, which is opposite to the first direction. Among them, the second direction can be the expansion direction.

[0132] It can be understood that in the second state, the first concave cam structure (i.e., the concave cam structure 531A) is separated from the third concave cam structure (i.e., the concave cam structure 541A), and the second shaft end resistance iron (i.e., the shaft end resistance iron 550A-2) is pressed against the fourth concave cam structure (i.e., the concave cam structure 542A) under the action of the spring 560A, and the second concave cam structure (i.e., the concave cam structure 532A) is meshed with the fourth concave cam structure (i.e., the concave cam structure 542A) to provide a torque in the second direction, and the first direction and the second direction are opposite directions.

[0133] For example, Figure 7 As shown in (c), the second concave cam group gives the arc arm 530A a torque to the left, such as a torque in the unfolding direction. At this time, the end of the retaining spring 570A close to the shaft end blocker 550A-1 is stuck in the slot 545A on the tensioning concave cam frame 540A, preventing the tensioning concave cam frame 540A from moving axially, that is, preventing the concave cam structure 542A from separating from the concave cam structure 532A, and maintaining the second state. It should be understood that at this time, the end of the retaining spring 570A close to the shaft end blocker 550A-2 is in a free state and can be placed on the tensioning concave cam frame 540A.

[0134] That is to say, in the second state, the first end of the retaining spring 570A is clamped in the first clamping groove 545A, preventing the first concave cam structure (i.e., the concave cam structure 531A) and the third concave cam structure (i.e., the concave cam structure 541A) from approaching each other, and the second end of the retaining spring 570A rests on the tensioning concave cam frame 540A.

[0135] It should be understood that Figure 7 and Figure 8 In the embodiment, when the torque direction is switched, the tension concave cam frame 540 can move in the axial direction (i.e., the x direction) during the process of switching the torque direction, while the arc arm 530 does not move in the axial direction, but can move in a direction perpendicular to the axial direction. That is, in the above embodiment, the tension concave cam frame 540 moves along the axis to achieve the alternate engagement of the first concave cam group and the second concave cam group, thereby achieving the purpose of switching the direction of the closing / opening holding force.

[0136] The above combination Figures 2 to 8 The structure of the first torque reversing mechanism 500 provided in the embodiment of the present application and the movement process when changing the torque direction are introduced. The structure of the second torque reversing mechanism 500 provided in the embodiment of the present application and the movement process when changing the torque direction are introduced below.

[0137] In other embodiments, the arc arm 530 can rotate around the axis or slide along the axis direction. In this case, the tension concave cam frame 540 is fixed relative to the rotating shaft back plate 510. It should be understood that the principle of the arc arm 530 moving along the axis in this embodiment is essentially the same as the principle of the tension concave cam frame 540 moving along the axis in the above embodiment. The difference between the two is that in the above embodiment, the spring 560 pulls the shaft end blocker 550 to drive the tension concave cam frame 540 to move along the axis, while in this embodiment, the spring 560 pulls the shaft end blocker 550 to drive the arc arm 530 to move along the axial direction.

[0138] It should be noted that, in this embodiment, the structures of the arc arm 530 and the shaft end resistance iron 550 are the same as those described above. Figures 2 to 8 The structures of the arc arm 530 and the shaft end resistance iron 550 shown in the figure are substantially the same, and the following mainly describes the differences.

[0139] In this embodiment, the arc arm 530 can slide along the axial direction and rotate around the axial direction. In this case, the clamping spring 570 can be clamped in the sliding groove of the arc arm 530, so as to prevent the concave cam structure 531A or the concave cam structure 532A from moving along the axial direction. In other words, the first clamping groove 545A and the second clamping groove 546A on the tension concave cam frame 540 can be eliminated, and the first sliding groove and the second sliding groove are provided on the arc arm 530, and the two ends of the clamping spring 570 can be clamped in the first sliding groove or the second sliding groove respectively.

[0140] For example, Fig. 9 As shown, a first slide groove 535A and a second slide groove 536A are provided along the circumferential direction of the arc arm 530A, and the first slide groove 535A and the second slide groove 536A can be used to clamp the first end and the second end of the clamping spring 570A, respectively. The first slide groove 535A can be provided on the main body part 534A on one side close to the concave cam structure 531A, and the second slide groove 536A can be provided on the main body part 534A on one side close to the concave cam structure 532A.

[0141] The arc arm 530A may be provided with a first shoulder 537A and a second shoulder 538A along the axial direction, that is, the first shoulder 537A may be formed on the side of the main part 534A close to the concave cam structure 531A, and the second shoulder 538A may be formed on the side of the main part 534A close to the concave cam structure 532A. Specifically, the arc arm 530A includes the main part 534A, the first shoulder 537A and the second shoulder 538A, wherein the first shoulder 537A is provided on the side of the main part 534A close to the concave cam structure 531A, and the second shoulder 538A is provided on the side of the main part 534A close to the concave cam structure 532A.

[0142] In one example, the shaft end block 550A-1 may include a first stopper (not shown in the figure), which may abut against the first shaft shoulder 537A, thereby driving the arc arm 530A to move axially, so that the concave cam structure 532A is engaged with the concave cam structure 542A, and the concave cam structure 531A is separated from the concave cam structure 541A. Similarly, the shaft end block 550A-2 may include a second stopper (not shown in the figure), which may abut against the second shaft shoulder 538A, thereby driving the arc arm 530A to move axially, so that the concave cam structure 531A is engaged with the concave cam structure 541A, and the concave cam structure 532A is separated from the concave cam structure 542A.

[0143] It should be understood that in this example, the shaft end blocker 550A-1 may be a hollow structure and may be sleeved on the concave cam structure 541A of the tight concave cam frame 540, and the shaft end blocker 550A-2 may also be a hollow structure and may be sleeved on the concave cam structure 542A of the tight concave cam frame 540. Of course, the shaft end blocker 550A-1 and the shaft end blocker 550A-2 may also be other structures, as long as the stopper on the shaft end blocker can be moved against the shaft shoulder on the arc arm.

[0144] The positional relationship between the components of the torque reversing mechanism 500 during the torque reversing process will be described in detail below, that is, how the torque reversing is achieved when the arc arm 530 moves along the axial direction.

[0145] In the initial stage, the concave cam structure 531A of the arc arm 530A is meshed with the concave cam structure 541A of the loose concave cam frame 540A, the concave cam structure 532A of the loose arc arm 530A is separated from the concave cam structure 542A of the tight concave cam frame 540A, the concave cam structure 531A and the concave cam structure 541A form a first concave cam group, and the concave cam structure 532A and the concave cam structure 542A form a second concave cam group. In this case, the second stopper on the shaft end stopper 550A-2 will squeeze the second shaft shoulder 538A on the arc arm 530A under the action of the spring 560A, thereby generating a torque in a first direction, such as a torque in a closing direction.

[0146] It can be understood that in the first state, the second concave cam structure (i.e., the concave cam structure 532A) is separated from the fourth concave cam structure (i.e., the concave cam structure 542A), and the second stopper on the second shaft end block (i.e., the shaft end block 550A-2) presses the second shaft shoulder 538A on the arc arm 530A under the action of the spring 560A, so that the first concave cam structure (i.e., the concave cam structure 531A) is engaged with the third concave cam structure (i.e., the concave cam structure 541A) to provide a torque in a first direction.

[0147] At this time, the end (i.e., the second end) of the retaining spring 570A close to the shaft end stopper 550A-2 is stuck in the second slide groove 536A of the arc arm 530A, thereby preventing the arc arm 530A from moving along the axis, that is, preventing the concave cam structure 531A from separating from the concave cam structure 541A, and maintaining the first state. The end (i.e., the first end) of the retaining spring 570A close to the shaft end stopper 550A-1 is in a free state and can be placed on the arc arm 530A.

[0148] That is to say, in the first state, the second end of the retaining spring 570A is clamped in the second slide groove 536A, preventing the second concave cam structure (i.e., the concave cam structure 532A) and the fourth concave cam structure (i.e., the concave cam structure 542A) from approaching each other, and the first end of the retaining spring 570A can rest on the arc arm 530A.

[0149] In the transition stage, for example, when the user moves the protrusion 581A on the paddle 580A axially (i.e., along the negative direction of the x-axis), the paddle 580A will move. For example, the paddle 580A can be driven by other external forces (such as a linear motor, etc.) to move.

[0150] In this case, the baffle 583A on the paddle 580A can push against the baffle 552A-2 on the shaft end block 550A-2, so that the shaft end block 550A-2 moves away from the arc arm 530A, and the baffle 582A on the paddle 580A is separated from the baffle 552A-1 on the shaft end block 550A-1, and the baffle 552A-1 moves a certain distance with the baffle 582A on the paddle 580A. When the first stopper on the shaft end block 550A-1 contacts the first shaft shoulder 537A, the shaft end block 550A-1 Stop movement; as the paddle 580A continues to move, the paddle 580A will push the second end of the retaining spring 570A out of the second slide groove 536A; after the retaining spring 570A is completely pushed out of the second slide groove 536A, the arc arm 530A is not constrained in the axial direction, so that under the traction of the spring 560A, the first stop block on the shaft end block 550A-1 presses against the first shaft shoulder 5341A of the arc arm 530A and moves axially, so that the concave cam structure 531A and the concave cam structure 541A move away from each other, and the concave cam structure 532A and the concave cam structure 542A move closer to each other.

[0151] It can be understood that when the first state switches to the second state, the second baffle plate (i.e., baffle plate 583A) on the paddle 580A drives the second shaft end block (i.e., baffle plate 552A-2 on the shaft end block 550A-2) to move in the direction away from the arc arm 530A. After the paddle 580A pushes the second end of the retaining spring 570A out of the second slide groove 536A, the first block on the first shaft end block (i.e., shaft end block 550A-1) moves axially against the first shaft shoulder 537A of the arc arm 530A under the action of the spring 560A, so that the second concave cam structure (i.e., concave cam structure 532A) and the fourth concave cam structure (i.e., concave cam structure 542A) are close to each other, and the first concave cam structure (i.e., concave cam structure 531A) and the third concave cam structure (i.e., concave cam structure 541A) are away from each other.

[0152] After the torque direction is switched, the concave cam structure 532A of the arc arm 530A meshes with the concave cam structure 542A of the tension concave cam frame 540A, and the concave cam structure 531A of the arc arm 530A separates from the concave cam structure 541A of the tension concave cam frame 540A. In this case, the concave cam structure 532A squeezes the concave cam structure 542A under the action of the spring 560A, thereby generating a torque in a second direction, which is opposite to the first direction, such as a torque in the expansion direction.

[0153] It can be understood that, in the second state, the first concave cam structure (i.e., the concave cam structure 531A) is separated from the third concave cam structure (i.e., the concave cam structure 541A), and the first stopper on the first shaft end block (i.e., the shaft end block 550A-1) presses the first shaft shoulder 537A on the arc arm 530A under the action of the spring 560A, so that the second concave cam structure (i.e., the concave cam structure 532A) is engaged with the fourth concave cam structure (i.e., the concave cam structure 542A) to provide a torque in a second direction, and the first direction and the second direction are opposite directions.

[0154] At this time, the first end of the clamping spring 570A can be stuck in the first sliding groove 535A of the arc arm 530A, thereby preventing the arc arm 530A from moving along the axis, that is, preventing the concave cam structure 532A from separating from the concave cam structure 542A, and maintaining the second state. It should be understood that at this time, the first end of the clamping spring 570A is in a free state and can be placed on the arc arm 530A.

[0155] That is to say, in the second state, the first end of the retaining spring 570A is clamped in the first slide groove 535A, preventing the first concave cam structure (i.e., the concave cam structure 531A) and the third concave cam structure (i.e., the concave cam structure 541A) from approaching each other, and the second end of the retaining spring 570A rests on the arc arm 530A.

[0156] The above introduces the structure of the torque reversing mechanism 500 provided in the present application and the movement process when changing the torque direction.

[0157] It should be noted that, in the above embodiment, when the concave cam structure 531A of the arc arm 530A is engaged with the concave cam structure 541A of the tensioning concave cam frame 540A, the concave cam structure 532A of the arc arm 530A and the concave cam structure 542A of the tensioning concave cam frame 540A are in a separated state; and when the concave cam structure 532A of the arc arm 530A is engaged with the concave cam structure 542A of the tensioning concave cam frame 540A, the concave cam structure 531A of the arc arm 530A and the concave cam structure 541A of the tensioning concave cam frame 540A are in a separated state.

[0158] like Fig.10 As shown, Fig.10 The projection cross-sectional view of the arc arm 530A and the tension concave cam frame 540A in different states on the xy plane is shown. Fig.10 (a) shows a cross-sectional projection of the arc arm 530A and the tension concave cam frame 540A on the xy plane in the first state, Fig.10 (b) shows a projected cross-sectional view of the arc arm 530A and the tension concave cam frame 540A in the second state on the xy plane.

[0159] like Fig.10As shown in (a), when the torque reversing mechanism 500 is in the first state, the concave cam structure 531A is engaged with the concave cam structure 541A, and the concave cam structure 532A is separated from the concave cam structure 542A. During the rotation of the arc arm 530A around the axis, at the abutment, the force generated by the surface tangent to the convex part of the concave cam structure 531A and the concave part of the concave cam structure 541A can also be used as the force for the user to rotate the foldable electronic device (for example, a closing force). Fig.10 As shown in (b), when the torque reversing mechanism 500 is in the second state, the concave cam structure 532A is engaged with the concave cam structure 542A, and the concave cam structure 531A is separated from the concave cam structure 541A. During the rotation of the arc arm 530A around the axis, at the abutment, the force generated by the surface tangent to the convex part of the concave cam structure 532A and the concave part of the concave cam structure 542A can also be used as the force for the user to rotate the foldable electronic device (for example, the unfolding force), and Fig.10 The force generated in (b) is Fig.10 It should be understood that when the angle between the tangent surface and the length extension direction of the main axis (eg, the x direction) is smaller, the force generated during the rotation of the arc arm 530A is greater.

[0160] It should be noted that in this application, when a user closes the foldable electronic device (such as Fig.10 (a) of FIG. 1 ), a pre-closing force can be provided to assist the user in closing the foldable electronic device; when the user unfolds the foldable electronic device (as shown in FIG. 1 ), the foldable electronic device can be pre-closed. Fig.10 (b)), a pre-opening force can be provided to assist the user in unfolding the foldable electronic device.

[0161] To summarize, in the embodiments provided in the present application, on the one hand, the tension / relaxation concave cam frame 540 can be controlled to move axially while the arc arm 530 does not move axially, thereby realizing alternating engagement of the concave cam groups and achieving the purpose of switching the direction of the closing / expanding holding force (or torque); on the other hand, the arc arm 530 can also be controlled to move axially while the tension / relaxation concave cam frame 540 does not move axially, thereby realizing alternating engagement of the concave cam groups and achieving the purpose of switching the direction of the closing / expanding holding force (or torque).

[0162] It should be understood that the present application aims at the problem that the existing rotating shaft or hinge mechanism can only provide a single closing or unfolding holding force at a certain folding angle. Two pairs of concave cam groups with phase angle differences are selected to alternately mesh, so as to switch the direction of the closing / unfolding holding force. As a result, the user will not feel difficulty in opening the first shell and the second shell of the foldable electronic device due to the existence of a force (or torque) opposite to the operation intention. On the contrary, it can provide assistance consistent with the intended action direction. In addition, in the embodiment of the present application, a retaining spring is used to effectively maintain a specific state. As a result, the original state will be maintained as long as the user does not actively trigger the state switch. In addition. In the embodiment of the present application, a single reliable mechanical input such as a paddle and a push rod can be used, which can also be used as an input interface of an electrical control component to systematically solve the control problem of state switching.

[0163] It should be noted that the torque reversing mechanism 500 provided in the embodiment of the present application can be used in a rotating shaft, hinge, or other axial rotation mechanism, that is, a solution of using a pair of unequally directed concave cam groups (or beveled spiral grooves, etc.) to achieve torque reversal.

[0164] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A rotating shaft assembly, characterized in that: It includes a pair of torque reversing mechanisms, each of which includes: an arc arm, a loose concave cam frame, a first shaft end blocker, a second shaft end blocker and a spring, wherein: The two ends of the arc arm are respectively provided with a first concave cam structure and a second concave cam structure, the first concave cam structure and the second concave cam structure are arranged along the axial direction, and the first concave cam structure and the second concave cam structure are symmetrically arranged along a direction perpendicular to the axis; The tension concave cam frame comprises a third concave cam structure, a fourth concave cam structure and a connecting portion connected between the third concave cam structure and the fourth concave cam structure, the connecting portion is provided with a groove, the groove can accommodate part of the arc arm, the third concave cam structure and the fourth concave cam structure are arranged along the axial direction, and there is a phase difference between the third concave cam structure and the fourth concave cam structure; The arc arm is a hollow structure, the first concave cam structure has a first through hole, the second concave cam structure has a second through hole, the third concave cam structure has a third through hole, and the fourth concave cam structure has a fourth through hole, the spring is inserted through the arc arm, the first through hole, the second through hole, the third through hole and the fourth through hole, and the two ends of the spring are fixedly connected to the first shaft end blocker and the second shaft end blocker respectively; The first shaft end resistance iron is arranged on a side of the third concave cam structure away from the first concave cam structure, and the second shaft end resistance iron is arranged on a side of the fourth concave cam structure away from the second concave cam structure; In the first state, the second concave cam structure is separated from the fourth concave cam structure, the first shaft end blocker is pressed against the third concave cam structure under the action of the spring, and the first concave cam structure is meshed with the third concave cam structure to provide a torque in a first direction; In the second state, the first concave cam structure is separated from the third concave cam structure, the second shaft end resistance iron is pressed against the fourth concave cam structure under the action of the spring, the second concave cam structure is meshed with the fourth concave cam structure to provide a torque in a second direction, and the first direction and the second direction are opposite directions.

2. The shaft assembly according to claim 1, characterized in that: The torque reversing mechanism also includes a rotating shaft back plate and a rotating shaft bracket, and a semi-enclosed space is formed between the rotating shaft back plate and the rotating shaft bracket, and the semi-enclosed space is used to accommodate the arc arm, the tension concave cam frame, the first shaft end blocker, the second shaft end blocker and the spring.

3. The shaft assembly according to claim 2, characterized in that: The torque reversing mechanism further comprises a clamping spring, the middle portion of which is fixedly connected to the shaft back plate, and both ends of which are capable of elastic deformation; A first clamping slot and a second clamping slot are provided on one side of the connecting portion of the tensioning concave cam frame close to the rotating shaft back plate, wherein the first clamping slot and the second clamping slot are used to clamp the first end and the second end of the clamping spring respectively; Wherein, in the first state, the second end of the clamping spring is clamped in the second clamping groove to prevent the second concave cam structure and the fourth concave cam structure from approaching each other, and the first end of the clamping spring rests on the tension concave cam frame; In the second state, the first end of the clamping spring is clamped in the first clamping groove to prevent the first concave cam structure and the third concave cam structure from approaching each other, and the second end of the clamping spring rests on the tension concave cam frame.

4. The shaft assembly according to claim 3, characterized in that: The torque reversing mechanism further includes a paddle, on which a first baffle and a second baffle are disposed, wherein the first baffle is located between the first shaft end blocker and the third concave cam structure, and the second baffle is located between the second shaft end blocker and the fourth concave cam structure; Among them, when the first state switches to the second state, the first baffle drives the first shaft end block to move in the direction away from the arc arm, and after the paddle pushes the second end of the retaining spring out of the second retaining groove, the second shaft end block drives the tension and release concave cam frame to move axially under the action of the spring, so that the second concave cam structure is close to the fourth concave cam structure, and the first concave cam structure is away from the third concave cam structure.

5. The shaft assembly according to any one of claims 1 to 4, characterized in that: The paddle is provided with a protrusion protruding toward the shaft back plate, and a through slot is provided at a position on the shaft back plate corresponding to the protrusion, and the protrusion can pass through the through slot.

6. The shaft assembly according to any one of claims 1 to 5, characterized in that: A boss is provided on the arc arm, and the boss is fixedly connected to the middle frame of the foldable electronic device, so that the arc arm can rotate around the axis.

7. The shaft assembly according to any one of claims 1 to 6, characterized in that: The first shaft end resistance iron is provided with a first fixing hole, and the second shaft end resistance iron is provided with a second fixing hole. The first fixing hole is used for fixed connection with the first end of the spring, and the second fixing hole is used for fixed connection with the second end of the spring.

8. A rotating shaft assembly, characterized in that: It includes a pair of torque reversing mechanisms, each of which includes: an arc arm, a loose concave cam frame, a first shaft end blocker, a second shaft end blocker and a spring, wherein: The two ends of the arc arm are respectively provided with a first concave cam structure and a second concave cam structure, the first concave cam structure and the second concave cam structure are arranged along the axial direction, and the first concave cam structure and the second concave cam structure are symmetrically arranged along a direction perpendicular to the axis; The tension concave cam frame comprises a third concave cam structure, a fourth concave cam structure and a connecting portion connected between the third concave cam structure and the fourth concave cam structure, the connecting portion is provided with a groove, the groove can accommodate part of the arc arm, the third concave cam structure and the fourth concave cam structure are arranged along the axial direction, and there is a phase difference between the third concave cam structure and the fourth concave cam structure; The arc arm is a hollow structure, the first concave cam structure has a first through hole, the second concave cam structure has a second through hole, the third concave cam structure has a third through hole, and the fourth concave cam structure has a fourth through hole. The spring is inserted through the arc arm, the first through hole, the second through hole, the third through hole, and the fourth through hole, and the two ends of the spring are fixedly connected to the first shaft end blocker and the second shaft end blocker respectively; The arc arm comprises a main body, a first shaft shoulder and a second shaft shoulder, wherein the first shaft shoulder is arranged on a side of the main body close to the first concave cam structure, and the second shaft shoulder is arranged on a side of the main body close to the third concave cam structure; The first shaft end resistance iron comprises a first stopper, and the second shaft end resistance iron comprises a second stopper, the first stopper can abut against the first shaft shoulder, and the second stopper can abut against the second shaft shoulder; In the first state, the second concave cam structure is separated from the fourth concave cam structure, and the second stopper on the second shaft end sear presses the second shaft shoulder on the arc arm under the action of the spring, so that the first concave cam structure is meshed with the third concave cam structure to provide a torque in a first direction; In the second state, the first concave cam structure is separated from the third concave cam structure, and the first stop block on the first shaft end stop iron is pressed against the first shaft shoulder on the arc arm under the action of the spring, so that the second concave cam structure is engaged with the fourth concave cam structure to provide a torque in a second direction, and the first direction and the second direction are opposite directions.

9. The shaft assembly according to claim 8, characterized in that: The torque reversing mechanism also includes a rotating shaft back plate and a rotating shaft bracket, and a semi-enclosed space is formed between the rotating shaft back plate and the rotating shaft bracket, and the semi-enclosed space is used to accommodate the arc arm, the tension concave cam frame, the first shaft end blocker, the second shaft end blocker and the spring.

10. The shaft assembly according to claim 9, characterized in that: The torque reversing mechanism further comprises a clamping spring, the middle portion of which is fixedly connected to the shaft back plate, and both ends of which are capable of elastic deformation; A first slide groove and a second slide groove are provided along the circumferential direction of the arc arm, the first slide groove is provided on a side of the main body portion close to the first concave cam structure, and the second slide groove is provided on a side of the main body portion close to the second concave cam structure, and the first slide groove and the second slide groove are used to clamp the first end and the second end of the clip respectively; Wherein, in the first state, the second end of the clamping spring is clamped in the second sliding groove to prevent the second concave cam structure and the fourth concave cam structure from approaching each other, and the first end of the clamping spring rests on the arc arm; In the second state, the first end of the clamping spring is clamped in the first sliding groove to prevent the first concave cam structure and the third concave cam structure from approaching each other, and the second end of the clamping spring rests on the arc arm.

11. The shaft assembly according to claim 10, characterized in that: The torque reversing mechanism further comprises a paddle, on which a first baffle and a second baffle are arranged, wherein the first baffle is located between the arc arm and the first concave cam structure, and the second baffle is located between the arc arm and the second concave cam structure; Among them, when the first state switches to the second state, the second baffle drives the second shaft end block to move in the direction away from the arc arm. After the paddle pushes the second end of the retaining spring out of the second slide groove, the first stop block on the first shaft end block moves axially against the first shaft shoulder of the arc arm under the action of the spring, so that the second concave cam structure is close to the fourth concave cam structure, and the first concave cam structure is away from the third concave cam structure.

12. The shaft assembly according to any one of claims 8 to 11, characterized in that: The paddle is provided with a protrusion protruding toward the shaft back plate, and a through slot is provided at a position on the shaft back plate corresponding to the protrusion, and the protrusion can pass through the through slot.

13. The shaft assembly according to any one of claims 8 to 12, characterized in that: A boss is provided on the arc arm, and the boss is fixedly connected to the middle frame of the foldable electronic device, so that the arc arm can rotate around the axis.

14. The shaft assembly according to any one of claims 8 to 13, characterized in that: The first shaft end resistance iron is provided with a first fixing hole, and the second shaft end resistance iron is provided with a second fixing hole. The first fixing hole is used for fixed connection with the first end of the spring, and the second fixing hole is used for fixed connection with the second end of the spring.

15. A foldable electronic device, characterized in that: include: a first shell; a second shell; The shaft assembly according to any one of claims 1 to 7, or the shaft assembly according to any one of claims 8 to 14, wherein the shaft assembly is connected between the first shell and the second shell.

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