Brake mechanism, hinge device, and foldable electronic device

Abstract

The present application provides a braking mechanism, a hinge device, and a foldable electronic device. The braking mechanism includes a fixed base, a braking swing arm, a rolling element, and a pressing device. The braking swing arm is rotatably arranged on the fixed base using a braking member. On the side wall of the braking member, a first recess, a protrusion, and a second recess are arranged. The protrusion has a guiding surface inclined with respect to the axis. When the pressing device presses the guiding surface of the protrusion using the rolling element, the guiding surface can improve the effect of the pressing force of the pressing device. As a result, the braking member receives a greater pressure, and when the braking swing arm rotates, the braking torque increases. Therefore, in the same space, the braking mechanism can provide a greater braking force. This enables the braking swing arm to stably stop at any rotation position and improves the comfort of rotating the braking swing arm.

Description

Technical Field

[0001] This application claims the priority of Chinese Patent Application No. 202221152690.9, titled "Braking Mechanism, Hinge Device, and Foldable Electronic Device", filed with the China National Intellectual Property Administration on May 13, 2022, the entire content of which is incorporated herein by reference.

[0002] This application relates to the field of foldable electronic devices, and particularly to a braking mechanism, a hinge device, and a foldable electronic device.

Background Art

[0003] With the development of flexible screens, foldable electronic devices have become an important direction in the development of electronic devices. Conventional foldable electronic devices generally include a first body, a second body, and a hinge mechanism that rotatably connects the first body and the second body, and the first body and the second body can be folded or unfolded relative to each other. The hinge device of a foldable electronic device is an important component for folding the electronic device. Generally, the hinge device has a braking mechanism, whereby the foldable electronic device is subjected to the braking force provided by the braking mechanism of the hinge device in the processes of being relatively folded and relatively unfolded, including when the foldable electronic device is relatively folded to the folded position and when the foldable electronic device is relatively unfolded to the unfolded position. In this way, the first body and the second body of the foldable electronic device can stop at any angle, and the operational comfort of relative folding or relative unfolding is improved. Alternatively, the foldable electronic device is stably held in the folded position or the unfolded position.

[0004] However, the space for the folding electronic device to accommodate the hinge device is limited, and the braking mechanism of existing folding electronic devices is restricted by the space, resulting in difficulties in providing sufficient braking force. As a result, when the first body and the second body rotate relative to each other, it is difficult to stably stop at any rotation position. Also, when the user rotates the first body and the second body, it is difficult to obtain sufficient braking feedback, and the user comfort of using the folding electronic device is reduced.

Summary of the Invention

Means for Solving the Problems

[0005] The object of the present application is to solve the problem of the prior art that it is difficult for the braking mechanism to provide sufficient braking force in a limited space. Therefore, the present application provides a braking mechanism, comprising a fixed base, a braking swing arm, at one end of the braking swing arm, at least one braking member is arranged, and any one of the at least one braking member is rotatably connected to the fixed base, whereby the braking swing arm rotates back and forth about an axis relative to the fixed base to switch the braking swing arm between a folded position and a deployed position, the braking member has a first recess, a protrusion, and a second recess sequentially connected in the circumferential direction of the braking member, and the protrusion has a guide surface inclined with respect to the axis, the braking swing arm; a rolling element and a pressing device, the pressing device abuts against the rolling element, and the rolling element abuts against the first recess, the protrusion, or the second recess of the braking member, whereby the pressing device applies an abutting pressure to the braking member using the rolling element, the rolling element and the pressing device; and includes when the braking swing arm is in the folded position, the rolling element abuts against the first recess, when the braking swing arm is in the deployed position, the rolling element abuts against the second recess, or When the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the rolling element rolls from the first recess or the second recess onto the guiding surface of the protrusion and abuts against the guiding surface. Accordingly, the pressing device moves together with the rolling element, whereby the pressing device is pressed in a direction opposite to the braking member along the axis. A braking mechanism is provided.

[0006] By using the above-mentioned technical solution, when the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the pressing device applies a pressing force to the guiding surface of the braking member by using the rolling element, and the guiding surface is inclined with respect to the axis. In this way, the pressing force of the pressing device can be amplified, whereby the acting force of the rolling element on the guiding surface becomes greater than the pressing force provided by the pressing device. This generates a greater braking force in the rotation process of the braking swing arm. Therefore, the braking swing arm can stop more stably at any position in the rotation process, the braking feedback obtained when the user rotates the braking swing arm is improved, and the comfort obtained when the user rotates the braking swing arm is enhanced.

[0007] Also, the rolling element and the braking member are connected so as to roll, and rolling friction occurs. Compared with the sliding friction connection method, the frictional force between the rolling element and the braking member is significantly reduced. This greatly reduces the wear between the rolling element and the braking member and improves the durability of the braking mechanism.

[0008] Also, the pressing device, the rolling element, and the braking member of the braking swing arm are sequentially abutted. This has the advantages of a simple structure and a compact arrangement. As a result, the overall volume of the braking mechanism is reduced, and the space occupied by the braking mechanism is reduced. Also, direct transmission is performed between the pressing device, the rolling element, and the braking member of the braking swing arm. This effectively avoids the loss of the pressing force of the pressing device in the transmission process and has the advantage of high transmission efficiency.

[0009] In some embodiments, the pressing device includes the following.

[0010] A sliding member is included. The sliding member is slidably connected to a fixed base and is located at one end of the braking member. Thus, the sliding member slides along the axis relative to the fixed base in a direction approaching the braking member or in a direction opposite to the braking member. A contact portion is disposed on the sliding member. The contact portion has a pressing surface. The rolling element abuts against the pressing surface of the contact portion so as to roll.

[0011] A pressing member is included. The pressing member is disposed on a side of the sliding member facing away from the end of the braking member and applies a pressing force to the sliding member. In this way, the pressing member pushes the sliding member so as to abut against the rolling element along the axis in order to apply a force acting in a certain direction to the rolling element. Further, the pressing force of the pressing member can be directly transmitted to the rolling element by using the sliding member and directly acts on the braking member by using the rolling element. This reduces the loss of the pressing force in the transmission process and improves the transmission efficiency of the pressing force.

[0012] When the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the rolling element rolls from the first recess or the second recess to the guiding surface of the protrusion. Accordingly, the sliding member moves together with the rolling element. Thus, the sliding member slides along the axis relative to the fixed base in a direction opposite to the braking member and presses the pressing member in a direction opposite to the braking member. In this way, the pressing force of the pressing member increases, and the acting force transmitted to the rolling element by the pressing member through the sliding member increases. Further, the rolling element uses the guiding surface inclined with respect to the axis to further increase the acting force transmitted to the rolling element by the sliding member. Thereby, the acting force of the rolling element on the guiding surface becomes larger than the pressing force of the pressing member, and the braking force in the rotation process of the braking member increases. Therefore, the braking swing arm can stably stop at an arbitrary position between the folded position and the deployed position in the folded position or the deployed position, the braking feedback obtained when the user rotates the braking swing arm is improved, and the comfort obtained when the user rotates the braking swing arm is improved.

[0013] In some embodiments, the first recess, the protrusion, and the second recess are located on the outer wall surface of the side wall of the braking member, and the surface of the protrusion facing away from the axis is the guiding surface.

[0014] The contact portion of the sliding member is located on the side of the first recess, the protrusion, and the second recess facing away from the axis.

[0015] The fixed base has a contact surface arranged facing the first recess, the protrusion, and the second recess. The contact surface contacts the side of the rolling element facing away from the axis and / or the side of the contact portion facing away from the axis. Thereby, the rolling element contacts the outer wall surface of the side wall of the braking member in the direction facing the axis. When the rolling element presses the guiding surface, the pressing member uses the sliding member to generate a pressing force along the axis on the rolling element, and the contact surface directly generates or generates a contact pressure in the direction perpendicular to the axis and facing the axis on the rolling element using the sliding member. In this way, a greater resultant force on the braking member is generated, and the braking force generated when the braking swing arm rotates increases.

[0016] In some embodiments, the protrusion uses a wedge-shaped curved surface structure. The protrusion has a first end near the end of the braking member and a second end facing away from the end of the braking member. The thickness of the protrusion increases in the direction from the first end to the second end.

[0017] In some embodiments, the guiding surface is provided in an arc shape in the circumferential direction of the braking member. In this way, when the rolling element moves relative to the guiding surface, the rolling element moves in an arc shape. Thereby, the position of the rolling element in the direction of the axis remains unchanged. The displacement and force for pressing the pressing member by the sliding member remain unchanged. Therefore, when the braking swing arm rotates between the folded position and the deployed position, the braking swing arm receives a uniform braking force. As a result, the comfort of rotating the braking swing arm is improved.

[0018] In some embodiments, the protrusion is located on both sides of the guide surface and has a first transition surface and a second transition surface connected to the guide surface. The first transition surface is further connected to the bottom surface of the first recess, and the second transition surface is further connected to the bottom surface of the second recess. Both the first transition surface and the second transition surface are inclined toward the first end of the protrusion. When the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the rolling element moves along the first transition surface or the second transition surface in the direction facing the first end of the protrusion, rolls on the guide surface, and presses the pressing surface of the contact portion. As a result, the sliding member moves relative to the fixed base in the direction facing the pressing member along the axis.

[0019] Also, when the braking swing arm rotates from the intermediate position to a position close to the folded position or from the intermediate position to a position close to the deployed position, the first transition surface or the second transition surface of the protrusion guides the rolling element so that it automatically rolls into the first recess or the second recess. As a result, the braking swing arm automatically rotates to the folded position or the deployed position, thereby implementing the effect of automatic opening and closing.

[0020] In some embodiments, arcuate corners are provided at the joint between the first transition surface and the first recess and at the joint between the first transition surface and the guide surface, respectively. The corner between the first transition surface and the tangent surface of the side edge of the guide surface is provided as an obtuse angle.

[0021] Arcuate corners are provided at the joint between the second transition surface and the second recess and at the joint between the second transition surface and the guide surface, respectively. The corner between the second transition surface and the tangent surface of the other side edge of the guide surface is provided as an obtuse angle. In this way, the process of the rolling element rolling on the guide surface along the first transition surface or the second transition surface becomes smoother, the rotation process of the braking swing arm becomes smoother, and the wear generated when the rolling element collides with the first transition surface and the second transition surface is reduced.

[0022] In some embodiments, the first recess, the protrusion, and the second recess are disposed on the end face of the side wall of the braking member, and the surface of the protrusion facing the axis is the guiding surface.

[0023] The contact portion of the sliding member is located on the side opposite to the end face of the braking member of the first recess, the protrusion, and the second recess, abuts on the side opposite to the guiding surface of the rolling element, and the pressing surface of the contact portion is inclined with respect to the axis.

[0024] The fixed base has a contact surface disposed toward the first recess, the protrusion, and the second recess, and the contact surface abuts on the side opposite to the end face of the braking member of the rolling element along the axis.

[0025] When the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the rolling element presses the pressing surface of the contact portion in the direction facing the axis, whereby the sliding member slides in a direction opposite to the braking member with respect to the fixed base. In this way, the pressing force of the pressing member increases, and the acting force transmitted to the rolling element by the pressing member using the sliding member increases. Further, the rolling element further increases the acting force transmitted to the rolling element by the sliding member using the guiding surface inclined with respect to the axis, whereby the acting force of the rolling element on the guiding surface becomes larger than the pressing force of the pressing member, and the braking force in the rotation process of the braking member increases. Therefore, the braking swing arm can stably stop toward an arbitrary position between the folded position and the deployed position in the folded position or the deployed position, the braking feedback obtained when the user rotates the braking swing arm is improved, and the comfort obtained when the user rotates the braking swing arm is improved.

[0026] In some embodiments, the pressing surface has a first end and a second end, and the pressing surface extends in a direction opposite to the axis perpendicular to the axis from the first end to the second end and extends in a direction facing the inside of the sliding member along the axis, whereby the extending direction of the pressing surface from the first end to the second end is inclined with respect to the axis.

[0027] In some embodiments, the guiding surface of the protrusion has a first edge located on the end surface of the braking member and a second edge facing away from the end surface of the braking member. The distance between the guiding surface and the axis increases in the direction from the first edge to the second edge.

[0028] In some embodiments, the guiding surface is provided in an arc shape in the circumferential direction of the braking member. In this way, when the rolling element moves relative to the guiding surface, the rolling element moves in an arc shape rotating around the axis, and thus, the position of the rolling element in the direction perpendicular to the axis remains unchanged. The displacement and force for pressing the pressing member by the sliding member remain unchanged. Therefore, when the braking swing arm rotates between the folded position and the deployed position, the braking swing arm receives a uniform braking force, and as a result, the comfort of rotating the braking swing arm is improved.

[0029] In some embodiments, the protrusion is located on both sides of the guiding surface and has a first transition surface and a second transition surface connected to the guiding surface. The first transition surface is further connected to the bottom surface of the first recess, and the second transition surface is further connected to the bottom surface of the second recess. When the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the rolling element rolls along the first transition surface or the second transition surface onto the guiding surface, and the first transition surface or the second transition surface of the protrusion and the contact surface of the fixed base press the rolling element against each other. As a result, the rolling element moves in a direction perpendicular to the axis and approaching the axis, presses the pressing surface of the contact part, and the sliding member moves relative to the fixed base in a direction along the axis and facing the pressing member.

[0030] Also, when the braking swing arm rotates from the intermediate position to a position close to the folded position or from the intermediate position to a position close to the deployed position, the first transition surface or the second transition surface of the protrusion guides the rolling element to automatically roll into the first recess or the second recess, and as a result, the braking swing arm automatically rotates to the folded position or the deployed position, and thus, the effect of automatic opening and closing is implemented.

[0031] In some embodiments, arcuate corners are provided at the joints between the first transition surface and the first recess and between the first transition surface and the guide surface, respectively, and the corner between the first transition surface and the tangent surface of the side edge of the guide surface is provided as an obtuse angle.

[0032] Arcuate corners are provided at the joints between the second transition surface and the second recess and between the second transition surface and the guide surface, respectively, and the corner between the second transition surface and the tangent surface of the other side edge of the guide surface is provided as an obtuse angle. In this way, the process of the rolling element rolling along the first transition surface or the second transition surface onto the guide surface becomes smoother, the rotation process of the braking swing arm becomes smoother, and the wear generated when the rolling element collides with the first transition surface and the second transition surface is reduced.

[0033] In some embodiments, a connecting shaft is arranged on the fixed base, the braking member uses a sleeve structure, is sleeved on the connecting shaft, and the braking member is rotatably connected to the connecting shaft. As a result, the braking swing arm rotates back and forth around the connecting shaft with respect to the fixed base, and the axis is the axis of the connecting shaft. Therefore, when the rolling element presses the braking member, frictional resistance is generated due to the compression between the braking member and the connecting shaft, and as a result, a braking effect on the rotational movement of the braking swing arm is produced.

[0034] In some embodiments, the sliding member is slidably connected to the connecting shaft and can move along the axis of the connecting shaft, and the side of the sliding member facing the pressing member is provided in a planar shape. In this way, the pressure applied to the side of the sliding member by the pressing member can be more evenly distributed. This ensures that the sliding process and the force transmission process of the sliding member are more stable.

[0035] In some embodiments, the pressing member is an elastic member. The elastic member is sleeved on the connecting shaft, and the elastic member is elastically deformed along the axis of the connecting shaft to apply a pressing force to the sliding member. In this way, the pressing member can provide a stable pressing force under a certain deformation, and the braking effect of the braking member in the rotational motion is uniformly maintained.

[0036] In some embodiments, two braking members arranged symmetrically are disposed at the end of the braking swing arm. At each of the two ends along the axis at the end of the braking swing arm, a rolling element and a pressing device are arranged corresponding to the two braking members. Arranging the two braking members can effectively increase the braking force applied to the braking swing arm. Also, the braking members are arranged symmetrically, whereby the braking forces provided by the two braking members are balanced. In this way, the rotation of the braking swing arm is more stable and the braking effect is better.

[0037] One embodiment of the present application provides a hinge device including any one of the braking mechanisms of the foregoing embodiments.

[0038] By using the foregoing technical solutions, the structure of the hinge device becomes simpler and more compact, and the acting force of the rolling element on the braking member is greater than the pressing force of the pressing device. In this way, the hinge device can be accommodated in the limited space inside the folding electronic device, and sufficient braking force is provided, thus ensuring the braking effect obtained when the hinge device rotates.

[0039] In some embodiments, the hinge device includes two braking mechanisms arranged symmetrically.

[0040] One embodiment of the present application provides a folding electronic device including a first body and a second body, and further including any one of the hinge devices of the foregoing embodiments. The hinge device is configured to drive the first body and the second body to unfold or fold relative to each other.

[0041] By using the foregoing technical solution, the hinge device has a smaller size, whereby the hinge device occupies a smaller internal space of the first body and the second body. This helps to optimize the layout of the internal spaces of the first body and the second body. Further, the hinge device has high durability, good braking effect, and low manufacturing cost, whereby the foldable electronic device can have a longer service life for folding and unfolding. The braking comfort for folding or unfolding the first body and the second body relative to each other is improved. It is ensured that the first body and the second body can stop at any angle.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0043] The following describes the embodiments of the present application using specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application based on the content disclosed in this specification. Although the present application is described with reference to some embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of the description of the present application with reference to the embodiments is to include other alternatives or modifications that can be derived according to the claims of the present application. To provide a deep understanding of the present application, the following description includes many specific details. The present application may alternatively be implemented without using these details. Also, some specific details are omitted from the description to avoid confusion or obscuring the focus of the present application. It should be noted that the embodiments and features of the embodiments of the present application can be combined with each other when there is no contradiction.

[0044] It should be noted that in this specification, the same reference numerals and characters in the following attached drawings represent the same things. Therefore, once something is defined in the attached drawings, it does not need to be further defined or interpreted in the following attached drawings.

[0045] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" is the orientation or positional relationship based on the attached drawings, and is only intended to facilitate the description of the present application and simplify the description, and is not intended to indicate or imply that the specified device or element needs to have a specific orientation or be constructed and operated in a specific orientation. Therefore, this cannot be understood as a limitation to the present application. Also, the terms "first" and "second" are only used for the purpose of description and should not be understood as an indication or implication of relative importance.

[0046] In the description of this application, it should be noted that the terms "attach", "interconnect", and "connect" should be understood in a broad sense unless otherwise specifically specified and restricted. For example, such terms may indicate a fixed connection, a detachable connection, or an integral connection, or may indicate a direct interconnect, an indirect interconnect via an intermediate medium, or an internal communication between two elements. Those skilled in the art can understand the specific meaning of the aforementioned terms in this application based on specific circumstances.

[0047] To make the objectives, technical solutions, and advantages of this application more clear, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0048] Please refer to FIGS. 1 and 2. FIG. 1 is a schematic diagram of the structure of a foldable electronic device in a folded state according to an embodiment of this application. FIG. 2 is a schematic diagram of the structure of a foldable electronic device in an unfolded state according to an embodiment of this application. As shown in FIGS. 1 and 2, the foldable electronic device 1 includes a first main body 11, a second main body 12, and a hinge device 20. The first main body 11 and the second main body 12 are rotatably connected via the hinge device 20. When the user uses the foldable electronic device 1, the first main body 11 and the second main body 12 can be rotated relative to each other. For example, the first main body 11 and the second main body 12 can be folded or unfolded relative to each other. In this way, the foldable electronic device 1 remains in a folded state (as shown in FIG. 1) or an unfolded state (as shown in FIG. 2). Alternatively, the first main body 11 and the second main body 12 are rotated relative to each other so that the first main body 11 and the second main body 12 are in an intermediate state (not shown) between the folded state and the unfolded state. The foldable electronic device 1 may be, for example, a foldable phone, a foldable tablet computer, a foldable notebook computer, a foldable display, or a smart wearable device, etc., but is not limited thereto. In this embodiment, a foldable phone is used as an example to describe the foldable electronic device 1.

[0049] Please refer to FIG. 3. FIG. 3 is a schematic exploded view of a partial structure of a hinge device of a foldable electronic device according to an embodiment of the present application. As shown in FIG. 3, the hinge device 20 includes a fixed base 21, a first braking swing arm 22 and a second braking swing arm 23 that are rotatably arranged on the fixed base 21. The first braking swing arm 22 is connected to the first main body 11 via a first connecting member 31, and is configured to drive the first main body 11 to rotate with respect to the fixed base 21. The second braking swing arm 23 is connected to the second main body 12 via a second connecting member 32, and is configured to drive the second main body 12 to rotate with respect to the fixed base 21. Those skilled in the art can understand that a plurality of connection methods can be used between the first braking swing arm 22 and the first main body 11, and between the second braking swing arm 23 and the second main body 12. In another alternative embodiment, the first braking swing arm 22 may be directly connected to the first main body 11, and the second braking swing arm 23 may be directly connected to the second main body 12.

[0050] A braking mechanism is arranged in the hinge device 20, whereby the first braking swing arm 22 and the second braking swing arm 23 are controlled by a braking force during the rotation process. In this way, when the user folds or unfolds the first main body 11 and the second main body 12 with respect to each other, the braking mechanism can provide a braking force that prevents the first main body 11 and the second main body 12 from being folded or unfolded with respect to each other. Therefore, the user can feel obvious braking feedback when rotating the first main body 11 and the second main body 12. The user operation comfort of relatively folding or relatively unfolding the foldable electronic device 1 is improved, and it becomes easier to control the rotation angle between the first main body 11 and the second main body 12. When the first main body 11 and the second main body 12 lose an external acting force, the braking action of the hinge device 20 can continue to enable the first main body 11 and the second main body 12 to stop in any intermediate state.

[0051] Also, when the first main body 11 and the second main body 12 are in the folded state or the unfolded state, the braking mechanism can provide a braking force that restricts the relative rotation of the first main body 11 and the second main body 12, whereby the first main body 11 and the second main body 12 can stably remain in the folded state or the unfolded state.

[0052] Please refer to FIGS. 4 and 5. FIGS. 4 and 5 are schematic cross-sectional views of the synchronization mechanism of the foldable electronic device in the folded state and the unfolded state according to an embodiment of the present application. As shown in FIGS. 4 and 5 and understood with reference to FIG. 3, the synchronization mechanism 40 is disposed at each of both ends of the hinge device 20 in the longitudinal direction L of the hinge device 20, and the synchronization mechanisms 40 at both ends are symmetrically disposed. In this way, the first main body 11 and the second main body 12 can rotate synchronously with respect to the fixed base 21, thereby ensuring a good user experience for rotating the foldable electronic device 1 to obtain symmetric rotation. The synchronization mechanism 40 includes a first rotating arm 41, a second rotating arm 42, and a transmission assembly 43. Both the first rotating arm 41 and the second rotating arm 42 are rotatably disposed on the fixed base 21. The rotation axis of the first rotating arm 41 coincides with the rotation axis of the first braking swing arm 22, and since the first rotating arm 41 is connected to the first connecting member 31, the first rotating arm 41 can rotate synchronously with the first braking swing arm 22 using the first connecting member 31. The rotation axis of the second rotating arm 42 coincides with the rotation axis of the second braking swing arm 23, and since the second rotating arm 42 is connected to the second connecting member 32, the second rotating arm 42 can rotate synchronously with the second braking swing arm 23 using the second connecting member 32. Further, a first transmission gear 411 is disposed on the outer wall surface of one end of the first rotating arm 41 close to the rotation axis. A second transmission gear 421 is disposed on the outer wall surface of one end of the second rotating arm 42 close to the rotation axis. The first transmission gear 411 and the second transmission gear 421 are connected via the transmission assembly 43. The transmission assembly 43 includes two transmission gears rotatably disposed on a fixed support. In this way, the first rotating arm 41 and the second rotating arm 42 can rotate synchronously. In another alternative embodiment, the transmission assembly 43 may not be disposed, and the first transmission gear 411 and the second transmission gear 421 are engaged to perform synchronous rotation.Those skilled in the art can understand that the first rotating arm 41 and the second rotating arm 42 are not limited to gear transmission, and alternatively, a plurality of transmission methods such as chain transmission and belt transmission may be used to implement the synchronous rotation of the first rotating arm 41 and the second rotating arm 42.

[0053] Furthermore, those skilled in the art can understand that two symmetrically arranged synchronization mechanisms 40 are used to achieve a better synchronization effect between the first rotating arm 41 and the second rotating arm 42. In another alternative embodiment, only a single synchronization mechanism 40 may be arranged, or when the length of the hinge device 20 is long, three or more synchronization mechanisms 40 may be arranged.

[0054] Furthermore, those skilled in the art can understand that the synchronization mechanism 40 is used to implement the synchronous rotation of the first braking swing arm 22 and the second braking swing arm 23, whereby the first main body 11 and the second main body 12 can rotate symmetrically and synchronously with respect to the fixed base 21 of the hinge device 20. Therefore, in another alternative embodiment, the synchronization mechanism 40 may not be arranged, whereby the first main body 11 and the second main body 12 can rotate independently with respect to the fixed base 21 of the hinge device 20.

[0055] Please refer to FIGS. 6 to 9. FIG. 6 is a schematic exploded view of the structure of a hinge device according to an embodiment of the present application. FIGS. 7 to 9 are top views of the structures of the hinge device in the folded state, intermediate state, and unfolded state according to the embodiment of the present application.

[0056] As shown in FIGS. 6 to 9, the hinge device 20 includes a first braking mechanism and a second braking mechanism that are symmetrically arranged. The first braking mechanism includes a fixed base 21, a first braking swing arm 22, a first rolling element 26, and a first pressing device. The second braking mechanism includes a fixed base 21, a second braking swing arm 23, a second rolling element 27, and a second pressing device. The first braking mechanism and the second braking mechanism share the same fixed base 21, and a first connecting shaft 24 and a second connecting shaft 25 that are parallel to each other are arranged on the fixed base 21. One end of the first braking swing arm 22 is rotatably arranged on the first connecting shaft 24, and the rotation axis of the first braking swing arm 22 is the axis of the first connecting shaft 24. One end of the second braking swing arm 23 is rotatably arranged on the second connecting shaft 25, and the rotation axis of the second braking swing arm 23 is the axis of the second connecting shaft 25. In this way, the first braking swing arm 22 and the second braking swing arm 23 can rotate back and forth with respect to the fixed base 21 in order to switch the first braking swing arm 22 and the second braking swing arm 23 between the folded position and the deployed position. Therefore, the first braking swing arm 22 and the second braking swing arm 23 correspond to the folded state, the intermediate state, and the deployed state of the hinge device 20, and have a folded position, an intermediate position, and a deployed position.

[0057] Furthermore, those skilled in the art can understand that the first braking mechanism and the second braking mechanism may alternatively be arranged asymmetrically. In the same hinge device 20, the first braking mechanism and the second braking mechanism may alternatively use braking mechanisms having different structures, or only one braking mechanism may be arranged.

[0058] Since the first braking mechanism and the second braking mechanism have the same structure and function, the following uses the first braking mechanism as an example for explanation.

[0059] Please refer to FIGS. 10 to 12. FIG. 10 is a schematic diagram of the structure of the first braking swing arm of the first braking mechanism according to an embodiment of the present application. FIGS. 11 and 12 are schematic diagrams of the structure of the sliding member of the first braking mechanism according to the embodiment of the present application. As shown in FIG. 10 and understood with reference to FIG. 6, a first braking member 221 and a second braking member 222 are arranged at one end of the first braking swing arm 22 of the first braking mechanism. In one embodiment, both the first braking member 221 and the second braking member 222 are arranged using a sleeve structure. Both the first braking member 221 and the second braking member 222 are rotatably arranged on the first connecting shaft 24, whereby the first braking swing arm 22 can rotate back and forth about the axis of the first connecting shaft 24 with respect to the fixed base 21. The first braking member 221 and the second braking member 222 are symmetrically arranged with respect to a plane perpendicular to the axis of the first connecting shaft 24. In another alternative embodiment, the first braking member 221 and the second braking member 222 may use another structure rotatably arranged on the fixed base 21. For example, cantilever beams are arranged at both ends of the first braking member 221 and the second braking member 222, whereby the first braking member 221 and the second braking member 222 are rotatably arranged on the fixed base 21 using the cantilever beams.

[0060] The structure of the first braking member 221 is the same as that of the second braking member 222, and the first braking member 221 and the second braking member 222 are symmetrically arranged. Therefore, the following uses the first braking member 221 as an example for illustration. Those skilled in the art can understand that the first braking member 221 and the second braking member 222 use the same structure and are symmetrically arranged in order to improve the stability of the rotation process of the first braking swing arm 22 and better balance the frictional forces between the first braking member 221 and the first connecting shaft 24 and between the second braking member 222 and the first connecting shaft 24. Therefore, in some embodiments, the first braking member 221 and the second braking member 222 may alternatively use different structures. Furthermore, in another alternative embodiment, only a single braking member may be arranged at one end of the first braking swing arm 22.

[0061] The first braking member 221 includes an inner wall surface a corresponding to the first connecting shaft 24, an outer wall surface b facing away from the first connecting shaft 24, and end surfaces located at both ends of the first braking member 221. One end of the first braking member 221 facing away from the second braking member 222 is the first end surface c, and one end of the first braking member 221 facing the second braking member 222 is the second end surface d. The inner wall surface a of the first braking member 221 is in contact with the outer wall surface of the first connecting shaft 24 and is rotatably connected thereto. The fixed base 21 extends to a position between the first braking member 221 and the second braking member 222, and the second end surface d of the first braking member 221 abuts against the fixed base 21. When an interaction is formed between the inner wall surface a of the first braking member 221 and the outer wall surface of the first connecting shaft 24, and an interaction is formed between the second end surface d of the first braking member 221 and the fixed base 21, a frictional force that hinders the rotation of the first braking member 221 can be generated. In this way, a braking force that partially hinders the rotation of the first braking swing arm 22 is formed, and the braking effect in the rotation process of the first braking swing arm 22 is improved.

[0062] On the outer wall surface b of the first braking member 221, a first recess 223, a protrusion 224, and a second recess 225 that are sequentially connected in the circumferential direction of the first braking member 221 are arranged. The protrusion 224 protrudes from the outer wall surface b of the first braking member 221, and the first recess 223 and the second recess 225 are recessed in the direction facing the first connecting shaft 24 with respect to the protrusion 224.

[0063] The first rolling element 26 and the first pressing device are arranged at a position on the fixed base 21 close to the first end surface c of the first braking member 221. The second rolling element 27 and the second pressing device are arranged at an end corresponding to the second braking member 222 and facing away from the first braking member 221. The structures and functions of the first rolling element 26 and the first pressing device are the same as those of the second rolling element 27 and the second pressing device. The first rolling element 26, the second rolling element 27, the first pressing device, and the second pressing device are symmetrically arranged. Therefore, the first rolling element 26 and the first pressing device are used as an example for explanation below.

[0064] In one embodiment, the first rolling element 26 may be arranged using a ball structure. The first pressing device includes a sliding member 28 slidably arranged on the first connecting shaft 24, and a pressing member 29 that abuts on the side of the sliding member 28 facing away from the first end face c of the first braking member 221. The pressing member 29 is arranged using a spring, sleeved on the first connecting shaft 24, and provides a pressing force to the sliding member 28 along the axis of the first connecting shaft 24. Those skilled in the art can understand that the pressing member 29 is used to provide a pressing force in a certain direction. Therefore, in another embodiment, the pressing member 29 may alternatively be a structure capable of providing a stable pressing force, such as a pneumatic pressing device, a motor pressing device, or a rubber pressing member.

[0065] The side of the sliding member 28 facing the pressing member 29 is provided in a planar shape, so that the pressure of the pressing member 29 can act evenly on the sliding member 28, and the sliding process and force transmission process of the sliding member 28 with respect to the first connecting shaft 24 are more stable. A contact portion 281 is arranged on the side of the sliding member 28 facing away from the pressing member 29. The contact portion 281 corresponds to the first recess 223, the protrusion 224, and the second recess 225 of the first braking member 221. A pressing surface p is provided on the contact portion 281. Further, the first rolling element 26 is arranged to roll on the contact portion 281 and abuts on the pressing surface p of the contact portion 281. Thus, the sliding member 28 transmits the pressing force of the pressing member 29 to the first rolling element 26 using the pressing surface p of the contact portion 281. In this way, the first rolling element 26 presses the first recess 223, the protrusion 224, or the second recess 225. In one embodiment, the pressing surface p is perpendicular to the axis of the first connecting shaft 24. Those skilled in the art can understand that the pressing surface p of the contact portion 281 is used to transmit the acting force between the first rolling element 26 and the sliding member 28. Therefore, in another embodiment, the pressing surface p may alternatively be arranged inclined with respect to the axis of the first connecting shaft 24.

[0066] Further, the fixed base 21 has a contact surface e disposed toward the first recess 223, the protrusion 224, and the second recess 225. The contact surface e contacts the first rolling element 26 and the contact portion 281 on the side opposite to the first connecting shaft 24. In this way, the first rolling element 26 contacts the first recess 223, the protrusion 224, or the second recess 225 in the direction facing the first connecting shaft 24, and the movement of the first rolling element 26 in the direction perpendicular to the first connecting shaft 24 is restricted. In this way, the first rolling element 26 can apply a sufficient acting force to the first recess 223, the protrusion 224, or the second recess 225 of the first braking member 221, whereby an interaction force is formed between the first rolling element 26 and the first recess 223, between the first rolling element 26 and the protrusion 224, or between the first rolling element 26 and the second recess 225. In this way, a frictional force that hinders the rotation of the first braking member 221 is generated during the rotation process of the first braking member 221, and a braking force that hinders the rotation of the first braking swing arm 22 is generated (the braking force is the main braking force applied to the first braking swing arm 22 during rotation). Therefore, the braking effect during the rotation process of the first braking swing arm 22 is improved.

[0067] The first recess 223 is a first bottom surface f that supports the first rolling element 26. The first bottom surface f is flush with the outer wall surface b of the first braking member 221. The first bottom surface f includes a first side surface g and a first opening 2231 provided opposite to each other along the axis of the first connecting shaft 24, and a first transition surface h and a second side surface i provided opposite to each other in the circumferential direction of the first connecting shaft 24. The first side surface g is separately connected to the first bottom surface f, the second side surface i, and the first transition surface h. The first transition surface h is separately connected to the first bottom surface f and the first side surface g.

[0068] Please refer to FIGS. 13 to 23. FIGS. 13 to 15 are perspective views of the structure at the position of the rolling elements when the hinge device according to the embodiment of the present application is in the folded state, the intermediate state, and the deployed state. FIGS. 16 to 18 are cross-sectional views of the structure at the position of the rolling elements when the hinge device according to the embodiment of the present application is in the folded state, the intermediate state, and the deployed state. FIG. 19 is an enlarged schematic view of a partial structure at the position of the rolling elements when the hinge device according to an embodiment of the present application is in the intermediate state. FIG. 20 is a schematic view of the force analysis of the rolling elements and the guide surface of FIG. 19 according to an embodiment of the present application. FIG. 21 is a cross-sectional view of a partial structure at the position of the rolling elements when the hinge device according to an embodiment of the present application is in the folded state. FIGS. 22a and 22b are schematic views of the force analysis of the rolling elements of FIG. 21 according to the embodiment of the present application.

[0069] As shown in FIGS. 13, 16, 21, 22a, and 22b and understood with reference to FIGS. 6, 7, and 10, when the first braking swing arm 22 is in the folded position, the first rolling element 26 abuts against the first concave portion 223 of the first braking member 221. In this case, the pressing member 29 applies a pressing force to the sliding member 28 along the axis of the first connecting shaft 24. The sliding member 28 transmits the pressure to the first rolling element 26 using the pressing surface p of the contact portion 281, applies pressure to the first rolling element 26 along the axis of the first connecting shaft 24, whereby the first rolling element 26 is pressed by the sliding member 28 so as to abut against the first side surface g of the first concave portion 223. Therefore, the movement of the first rolling element 26 in the direction of the axis of the first connecting shaft 24 is restricted. Further, the first transition surface h and the second side surface i on both sides of the first rolling element 26 restrict the movement of the first rolling element 26 in the circumferential direction of the first connecting shaft 24, whereby the first braking member 221 is tightened by the sliding member 28 using the first rolling element 26, and a braking force is formed to restrict the rotation of the first braking member 221 with respect to the first connecting shaft 24. Therefore, the first braking swing arm 22 is stably held in the folded position.

[0070] The protrusion 224 uses a wedge-shaped curved surface structure. The protrusion 224 has a first end 2241 close to the first end face c of the first braking member 221 and a second end 2242 close to the second end face d of the first braking member 221. The protrusion 224 has a guiding surface j facing away from the first connecting shaft 24, and the guiding surface j is connected to the first transition surface h, and the first transition surface h is inclined toward the first end 2241 of the protrusion 224.

[0071] As shown in FIGS. 21 to 22b, FIG. 22a is a schematic diagram of force analysis in a plane parallel to the axis direction of the first connecting shaft 24. FIG. 22b is a schematic diagram of force analysis in a plane perpendicular to the axis direction of the first connecting shaft 24. When the first braking swing arm 22 rotates from the folded position to the intermediate position under the action of an external force, first, sufficient rotational torque is applied to the first braking swing arm 22, whereby the first rolling element 26 applies a force Fn 2 to the first transition surface h. As shown in FIG. 22a, the force Fn 2 applied by the first rolling element 26 to the first transition surface h 6 can be decomposed into a component force F1 parallel to the axis of the first connecting shaft 24 and a component force F2 perpendicular to the axis of the first connecting shaft 24 (the direction of the component force F2 faces the axis of the first connecting shaft 24). In this case, the component force F1 is provided by the pressing force of the pressing member 29 for pressing the sliding member 28 (in this embodiment, the pressing force of the pressing member 29 is the elastic force of the spring). F2 is provided by the supporting force of the contact surface e. The inclination angle of the first transition surface h with respect to the axis of the first connecting shaft 24 is θ 6 Thus, F2 = F1 / tanθ

[0072] As shown in FIG. 22b, the center O 1 of the circle of the first rolling element 26 and the axis center O 2 of the first connecting shaft 24 2 The inclination angle of the first transition surface h with respect to the connecting line is θ 1 O 2 The narrow angle between the connecting line O 2 and the connecting line QO 4 is θ 1is the center of the circle of the first rolling element 26, O 2 is the axis of the first connecting shaft 24, and Q is the contact point of the first rolling element 26 with respect to the first transition surface h. The acting force Fn of the first rolling element 26 with respect to the first transition surface h 2 can be further decomposed into a torsional force Fa that hinders the rotation of the first braking swing arm 22 (in this case, the direction of the torsional force Fa is opposite to the rotation direction of the first braking swing arm 22). Therefore, the magnitude of Fa is (F2 / sinθ 2 )*cos(θ 2 -θ 4 ). It can be obtained that F2 = F1 / tanθ 6 After substituting, Fa = (F1 / (tanθ 6 *sinθ 2 ))*cos(θ 2 -θ 4 ) can be obtained. Also, the rotational force arm of the torsional force Fa is the distance L2 between the contact point Q of the first rolling element 26 with respect to the first transition surface h and the axis O 2 of the first connecting shaft 24. Therefore, when the first braking swing arm 22 rotates from the folded position to the intermediate position, it can be obtained that the rotational torque applied to the first transition surface h by the first rolling element 26 is Fa*L2. In one embodiment, appropriate angles of θ 2 , θ 4 , and θ 6 are set so that Fa can be greater than F1.

[0073] Also, under the action of an external force, the first rolling element 26 moves in the inclined direction of the first transition surface h toward the first end 2241 of the protrusion 224. As a result, the first rolling element 26 drives the sliding member 28 to move synchronously in the direction facing the pressing member 29 by pressing the pressing surface p of the contact portion 281. In this way, the sliding member 28 compresses the pressing member 29. This increases the elastic deformation of the pressing member 29 and the pressing force of the pressing member 29. Also, the first braking member 221 rotates with respect to the sliding member 28. As a result, the first rolling element 26 in the contact portion 281 rolls out of the first opening 2231 of the first recess 223 of the first braking member 221 and rolls to the guide surface j of the protrusion 224.

[0074] Therefore, in the process of the first braking swing arm 22 rotating from the folded position to the intermediate position, when the first rolling element 26 abuts against the first transition surface h, the first rolling element 26 can form acting forces F1, F2, and Fa in three different directions with respect to the first transition surface h (in one embodiment, Fa is greater than F1). In this way, the effect of the elastic force of the pressing member 29 on the first braking member 221 (the magnitude of the elastic force of the pressing member 29 is only F1) is improved, the frictional force applied to the first braking member 221 is increased, and the braking effect in the rotation process of the first braking swing arm 22 is improved.

[0075] When the first braking swing arm 22 rotates from the intermediate position to the folded position and the first rolling element 26 rolls from the protrusion 224 to the first transition surface h, the rotational torque applied to the first transition surface h by the first rolling element 26 is Fa*L2 (in this case, the direction of the torsional force Fa is the same as the rotational direction of the first braking swing arm 22, and in one embodiment, Fa is greater than F1). In this way, the first braking swing arm 22 can automatically rotate to the folded position and be stably held in the folded position. Therefore, the effect of automatic folding is implemented.

[0076] Furthermore, arc-shaped corners are respectively provided at the joint between the first transition surface h and the bottom surface of the first recess 223 and at the joint between the first transition surface h and the guide surface j, and the corner between the first transition surface h and the tangent curved surface of the side edge of the guide surface j is provided as an obtuse angle. In this way, the process of the first rolling element 26 rolling from the first recess 223 to the guide surface j becomes smoother, and the process of the first braking swing arm 22 rotating from the folded position to the intermediate position becomes smoother. Therefore, the sense of jerk in the rotation process of the first braking swing arm 22 is reduced, and the comfort of rotating the first braking swing arm 22 is improved.

[0077] The thickness of the protrusion 224 increases in the direction from the first end 2241 to the second end 2242, whereby the guide surface j is inclined with respect to the first connecting shaft 24. The guide surface j is provided in an arc shape in the circumferential direction of the first connecting shaft 24. In one embodiment, the center of the circle of the arc is located on the axis of the first connecting shaft 24. Those skilled in the art can understand that in another alternative embodiment, the center of the circle of the arc may not be located on the axis of the first connecting shaft 24.

[0078] As shown in FIGS. 14, 16, 19, and 20 and understood with reference to FIGS. 6, 8, and 10, when the first braking swing arm 22 is in the intermediate position, the first rolling element 26 abuts against the guide surface j, and the guide surface j supports the first rolling element 26 in a state inclined with respect to the first connecting shaft 24. The inclination angle of the guide surface j is θ 3 which is. In this case, the sliding member 28 applies a pressing force in a direction parallel to the axis of the first connecting shaft 24 to the first rolling element 26, and the contact surface e of the fixed base 21 directly applies a contact force in a direction perpendicular to the axis of the first connecting shaft 24 to the first rolling element 26. In this way, the first rolling element 26 forms a resultant force Fn perpendicular to the guide surface j with respect to the guide surface j under the action of the sliding member 28 and the contact surface e 1 The resultant force Fn of the first braking member 221 with respect to the guide surface j 1 The effect can be decomposed into a component force F1 in a direction parallel to the axis and a component force F2 perpendicular to the axis, and F2 = F1 / tan(θ 3 ) which is. In one embodiment, an appropriate θ 3 is set so that F2 can be greater than F1. The component force F1 enables an interaction force having the magnitude of F1 to be generated between the second end surface d of the first braking member 221 and the fixed base 21, and the component force F2 enables an interaction force having the magnitude of F2 to be generated between the inner wall surface a of the first braking member 221 and the outer wall surface of the first connecting shaft 24. In this case, F1 is the pressing force of the pressing member 29 (i.e., the elastic force of the spring). Between the first rolling element 26 and the guide surface j, there is simultaneously generated an acting force having a magnitude of the resultant force Fn 1 (Fn 1 is equal to F1 / sinθ 3 ).

[0079] Therefore, compared with the prior art, in this solution, the resultant force Fn of the first rolling elements 26 on the first braking member 221 1 is greater than the pressing force F1 of the pressing member 29, and the component force F2 perpendicular to the direction of the first connecting shaft 24 generated by the first rolling elements 26 on the first braking member 221 is greater than the pressing force F1 of the pressing member 29. In this way, the acting force generated on the first braking member 221 by the pressing force F1 of the pressing member 29 is amplified, and the braking force in the rotation process of the first braking member 221 is increased. Therefore, the first braking swing arm 22 can stably stop toward any position between the folded position and the unfolded position in the folded position or the unfolded position, the braking feedback obtained when the user rotates the first braking swing arm 22 is improved, and the comfort obtained when the user rotates the first braking swing arm 22 is improved.

[0080] As shown in FIGS. 15 and 18 and understood with reference to FIGS. 6, 9, and 10, the second recess 225 is a second bottom surface that supports the first rolling elements 26, and the second bottom surface is flush with the outer wall surface b of the first braking member 221. The second bottom surface, the third side surface k and the second opening provided opposite to each other along the axis of the first connecting shaft 24, and the second transition surface m and the fourth side surface n provided opposite to each other in the circumferential direction of the first connecting shaft 24. The third side surface k is separately connected to the second bottom surface, the fourth side surface n, and the second transition surface m. The second transition surface m is separately connected to the guide surface j, the second bottom surface, and the third side surface k. The second transition surface m is inclined toward the first end 2241 of the protrusion 224.

[0081] When the first braking swing arm 22 rotates from the intermediate position to the deployment position under the action of an external force, the first rolling element 26 rolls from the guide surface j to the second transition surface m. In this case, the first rolling element 26 loses the support of the guide surface j, and thereby, the first rolling element 26 rolls along the second transition surface m to the second bottom surface of the second recess 225. Further, the first rolling element 26 rolls in a direction opposite to that facing the pressing member 29 under the action of the pressing of the sliding member 28 in a direction parallel to the axis of the first connecting shaft 24. In this case, the first rolling element 26 receives the supporting force of the second transition surface m. The first rolling element 26 applies a torsional force Fa’ (in this case, the direction of the torsional force Fa’ is the same as the rotational direction of the first braking swing arm 22) to drive the first braking member 221 to rotate toward the deployment position to the second transition surface m. For the magnitude of the torsional force Fa’ and the magnitudes of the component forces in different directions, refer to the analysis of Fa described above. When the first transition surface h and the second transition surface m are symmetrically provided, Fa and Fa’ have the same magnitude. In this way, the first braking swing arm 22 can automatically roll into the second recess 225 under the action of pushing the first rolling element 26, and thereby, the first braking swing arm 22 is automatically deployed when approaching the deployment position.

[0082] When the first braking swing arm 22 rotates from the deployment position to the intermediate position, the torsional force Fa’ (in this case, the direction of the torsional force Fa’ is opposite to the rotational direction of the first braking swing arm 22) applied to the second transition surface m by the first rolling element 26 functions to prevent the rotation of the first braking swing arm 22. Further, the first rolling element 26 further applies a component force F1’ parallel to the axis of the first connecting shaft 24 and a component force F2’ perpendicular to the axis of the first connecting shaft 24 to the second transition surface m. This increases the frictional force applied to the first braking member 221. In this way, the braking force generated when the first braking swing arm 22 rotates from the deployment position to the intermediate position increases. The comfort obtained when the first braking swing arm 22 rotates can be improved. Also, the first braking swing arm 22 can be stably held in the deployment position.

[0083] Furthermore, arcuate corners are provided at the joints between the second transition surface m and the second bottom surface of the second recess 225 and at the joints between the second transition surface m and the guide surface j, and the corner between the second transition surface m and the tangent surface of the side edge of the guide surface j is provided as an obtuse angle. In this way, the process of the first rolling element 26 rolling from the guide surface j to the second recess 225 becomes smoother, and the process of the first braking swing arm 22 rotating from the intermediate position to the deployed position becomes smoother. Therefore, the sense of jerk in the rotation process of the first braking swing arm 22 is reduced, and the comfort of rotating the first braking swing arm 22 is improved.

[0084] When the first braking swing arm 22 is in the deployed position, the first rolling element 26 abuts against the second recess 225 of the first braking member 221. In this case, the pressing member 29 applies a pressing force to the sliding member 28 along the axis of the first connecting shaft 24. The sliding member 28 transmits pressure to the first rolling element 26 using the pressing surface p of the contact portion 281, and applies pressure to the first rolling element 26 along the axis of the first connecting shaft 24. As a result, the first rolling element 26 is pressed by the sliding member 28 so as to abut against the third side surface k of the second recess 225. Therefore, the movement of the first rolling element 26 in the direction of the axis of the first connecting shaft 24 is restricted. Further, the second transition surfaces m and the fourth side surfaces n on both sides of the first rolling element 26 restrict the movement of the first rolling element 26 in the circumferential direction of the first connecting shaft 24. As a result, the first braking member 221 is tightened by the sliding member 28 using the first rolling element 26, and a braking force for restricting the rotation of the first braking member 221 with respect to the first connecting shaft 24 is formed. Therefore, the first braking swing arm 22 is stably held in the deployed position.

[0085] Those skilled in the art can understand that when the first braking swing arm 22 rotates from the deployed position to the folded position, the first rotating arm 41 can also stop at any intermediate position. When the first braking swing arm 22 rotates from the intermediate position to the folded position under the action of an external force, the first braking swing arm 22 can also be automatically folded without the need to apply an external force when the first braking swing arm 22 approaches the folded position.

[0086] Refer to FIGS. 23 to 33. FIG. 23 is a schematic view of the structure of the first braking swing arm of the first braking mechanism according to another embodiment of the present application. FIGS. 24 and 25 are schematic views of the structure of the sliding member of the first braking mechanism according to other embodiments of the present application. FIGS. 26 to 28 are cross-sectional top views of the structure of the hinge device in the folded state, intermediate state, and deployed state according to other embodiments of the present application. FIG. 29 is an enlarged schematic view of a partial structure at the position of the first rolling element when the hinge device according to another embodiment of the present application is in the intermediate state. FIG. 30 is a schematic view of the force analysis of the first rolling element in FIG. 29 according to the present application. FIGS. 31 and 33 are cross-sectional views of a partial structure at the position of the first rolling element when the hinge device according to other embodiments of the present application is in the folded state. FIGS. 32 and 34 are schematic views of the force analysis of the first rolling element in FIGS. 31 and 33.

[0087] In this embodiment, the structures of the first braking member 221, the first rolling element 26, and the first pressing device are basically the same as those of the first embodiment, and the differences are as follows.

[0088] As shown in FIGS. 23 to 25 and understood with reference to FIG. 6, on the first end face c of the first braking member 221, a first recess 223, a protrusion 224, and a second recess 225 that are sequentially connected in the circumferential direction of the first braking member 221 are arranged. On the side of the sliding member 28 facing away from the pressing member 29, a contact portion 281 is arranged. The contact portion 281 corresponds to the first recess 223, the protrusion 224, and the second recess 225 of the first braking member 221. The contact portion 281 has a pressing surface p inclined with respect to the axis of the first connecting shaft 24. The first rolling element 26 abuts so as to roll on the pressing surface p of the contact portion 281. The pressing surface p has a first end p1 and a second end p2. The pressing surface p extends from the first end p1 to the second end p2 in a direction opposite to the axis of the first connecting shaft 24 and perpendicular to the axis of the first connecting shaft 24, and extends in a direction facing the inside of the sliding member 28 along the axis of the first connecting shaft 24. Thus, the extending direction of the pressing surface p from the first end p1 to the second end p2 is inclined with respect to the axis of the first connecting shaft 24.

[0089] Further, the fixed base 21 has a contact surface e arranged toward the first recess 223, the protrusion 224, and the second recess 225. The contact surface e abuts on the side of the first rolling element 26 opposite to the first end face c of the first braking member 221 in the direction of the axis of the first connecting shaft 24. In this way, the contact surface e of the fixed base 21 and the pressing surface p of the contact portion 281 bring the first rolling element 26 into contact with the first recess 223, the protrusion 224, and the second recess 225 of the first braking member 221.

[0090] The protrusion 224 has a guide surface j provided toward the first connecting shaft 24. The guide surface j has a first edge 2243 located on the first end face c of the first braking member 221 and a second edge 2244 opposite to the first end face c of the first braking member 221. The distance between the guide surface j and the first connecting shaft 24 increases in the direction from the first edge 2243 to the second edge 2244.

[0091] The first recess 223 of the first braking member 221 has a first bottom surface f perpendicular to the axis of the first connecting shaft 24 and a first transition surface h connected to the first bottom surface f and the guiding surface j of the protrusion 224. The first transition surface h is inclined toward one end of the protrusion 224, facing away from the first braking member 221.

[0092] As shown in FIGS. 23, 26, 31, and 33 and understood with reference to FIG. 6, when the first braking swing arm 22 is in the folded position, the first rolling element 26 abuts against the first recess 223 of the first braking member 221. In this case, the pressing member 29 applies an acting force to the first rolling element 26 using the sliding member 28. The first transition surface h of the first recess 223 faces the contact surface e of the fixed base 21 and clamps the first rolling element 26. This restricts the movement of the first rolling element 26 in the direction of the axis of the first connecting shaft 24. In this case, the first rolling element 26 forms a braking force against the first transition surface h that hinders the rotation of the first braking member 221. In this way, the first braking member 221 is clamped by the sliding member 28 using the first rolling element 26, and a braking force is formed that restricts the rotation of the first braking member 221 with respect to the first connecting shaft 24. Therefore, the first braking swing arm 22 is stably held in the folded position.

[0093] As shown in FIGS. 31 to 34, FIG. 31 is a schematic cross-sectional view of a partial structure in a direction parallel to the axis of the first connecting shaft 24. FIG. 33 is a schematic cross-sectional view of a partial structure in a direction perpendicular to the axis of the first connecting shaft 24. As shown in FIGS. 31 and 32, when the first braking swing arm 22 rotates from the folded position to the intermediate position under the action of an external force, first, sufficient rotational torque is applied to the first braking swing arm 22, whereby the first rolling element 26 applies an acting force Fn to the first transition surface h 2Add it. In this case, the pressing surface p of the sliding member 28 abuts against the first rolling element 26, and generates a component force F1 parallel to the axis of the first connecting shaft 24 with respect to the first rolling element 26. The magnitude of the component force F1 is equal to the pressing force of the pressing member 29 (that is, the elastic force of the spring). Also, the inclination angle of the pressing surface p with respect to the axis of the first connecting shaft 24 is θ 1 is. Therefore, the pressing surface p generates a component force F5 perpendicular to the axis of the first connecting shaft 24 with respect to the first rolling element 26. The magnitude of F5 is F1 / tanθ 1 is. Also, the acting force Fn of the first rolling element 26 on the first transition surface h 2 can be decomposed into a component force F2 parallel to the axis of the first connecting shaft 24 and a component force F4 perpendicular to the axis of the first connecting shaft 24. The inclination angle of the first transition surface h with respect to the axis of the first connecting shaft 24 is θ 2 is. Therefore, F4 = F5 = F1 / tanθ 1 , and F2 = F4*tanθ 2 , that is, F2=(F1 / tanθ 1 )*tanθ 2 can be obtained.

[0094] As shown in FIGS. 33 and 34, the center O of the circle of the first rolling element 26 1 and the axis center O of the first connecting shaft 24 2 The inclination angle of the first transition surface h with respect to the connecting line therebetween is θ 5 is. The connecting line O 1 O 2 and the connecting line QO 2 The narrow angle with is θ 4 is. O 1 is the center of the circle of the first rolling element 26, O 2 is the axis center of the first connecting shaft 24, and Q is the contact point of the first rolling element 26 with respect to the first transition surface h. The acting force Fn of the first rolling element 26 on the first transition surface h 2 can be further decomposed into a torsional force Fa that hinders the rotation of the first braking swing arm 22 (in this case, the direction of the torsional force Fa is opposite to the rotation direction of the first braking swing arm 22). Therefore, the magnitude of Fa is F4*cos(θ 5 +θ 4) That is, Fa = (F1 / tanθ 1 ) * cos(θ 5 + θ 4 ) can be obtained. Also, the rotation force arm of the torsional force Fa is the distance L2 between the contact point Q of the first rolling element 26 with respect to the first transition surface h and the axis O 2 of the first connecting shaft 24. Therefore, when the first braking swing arm 22 rotates from the folded position to the intermediate position, the rotational torque applied to the first transition surface h by the first rolling element 26 can be obtained as Fa * L2. In one embodiment, appropriate angles of θ 1 , θ 4 , and θ 5 are set so that Fa can be greater than F1.

[0095] Also, under the action of an external force, the first rolling element 26 moves along the first transition surface h in the direction facing the first connecting shaft 24, presses the pressing surface p of the contact portion 281, and thereby the sliding member 28 moves synchronously in the direction facing the pressing member 29. In this way, the sliding member 28 presses the pressing member 29. This increases the elastic deformation of the pressing member 29 and the pressing force of the pressing member 29. Also, the first braking member 221 rotates with respect to the sliding member 28, and thereby the first rolling element 26 within the contact portion 281 of the sliding member 28 rolls out of the first concave portion 223 and rolls to the guiding surface j of the protrusion 224.

[0096] Therefore, in the process of the first braking swing arm 22 rotating from the folded position to the intermediate position, when the first rolling element 26 abuts against the first transition surface h, the first rolling element 26 can form acting forces F2, F4, and Fa (in one embodiment, Fa is greater than F1) in three different directions with respect to the first transition surface h. In this way, the effect of the elastic force of the pressing member 29 on the first braking member 221 (the magnitude of the elastic force of the pressing member 29 is F1) is improved, the frictional force applied to the first braking member 221 is increased, and the braking effect in the rotation process of the first braking swing arm 22 is improved.

[0097] When the first braking swing arm 22 rotates from the intermediate position to the folded position and the first rolling element 26 rolls from the protrusion 224 to the first transition surface h, the rotational torque applied to the first transition surface h by the first rolling element 26 is Fa*L2 (in this case, the direction of the torsional force Fa is the same as the rotational direction of the first braking swing arm 22, and in one embodiment, Fa is greater than F1). In this way, the first braking swing arm 22 can automatically rotate to the folded position and be stably held in the folded position. Therefore, the effect of automatic folding is implemented.

[0098] Furthermore, arc-shaped corners are provided at the joint between the first transition surface h and the first bottom surface of the first recess 223 and at the joint between the first transition surface h and the guide surface j, respectively, and the corner between the first transition surface h and the tangent surface of the side edge of the guide surface j is provided as an obtuse angle. In this way, the process of the first rolling element 26 rolling from the first recess 223 to the guide surface j becomes smoother, and the process of the first braking swing arm 22 rotating from the folded position to the intermediate position becomes smoother. Therefore, the sense of paragraph in the rotation process of the first braking swing arm 22 is reduced, and the comfort of rotating the first braking swing arm 22 is improved.

[0099] The distance between the guide surface j and the first connecting shaft 24 increases in the direction from the first edge 2243 to the second edge 2244, whereby the guide surface j is in an inclined state with respect to the first connecting shaft 24. Also, the guide surface j is provided in an arc shape in the circumferential direction of the first connecting shaft 24. In one embodiment, the center of the circle of the arc is located on the axis of the first connecting shaft 24. Those skilled in the art can understand that in another alternative embodiment, the center of the circle of the arc may not be located on the axis of the first connecting shaft 24.

[0100] As shown in FIGS. 23, 27, 29, and 30 and understood with reference to FIG. 6, when the first braking swing arm 22 is in the intermediate position, the first rolling element 26 abuts against the guide surface j, and the guide surface j supports the first rolling element 26 in an inclined state with respect to the first connecting shaft 24, and the inclination angle of the guide surface j is θ 3is the case. In this case, the sliding member 28 receives the elastic force F1 of the pressing member 29, and thereby, the pressing surface p of the contact portion 281 of the sliding member 28 applies a pressing force that is deflected opposite to the first connecting shaft 24 to the first rolling element 26. Therefore, the inclination angle θ of the axis of the pressing surface p with respect to the first connecting shaft 24 1 can be obtained. In this way, under the action of the sliding member 28, the first rolling element 26 forms a resultant force Fn perpendicular to the guide surface j with respect to the guide surface j 2 . The resultant force Fn of the first braking member 221 with respect to the guide surface j 2 can be decomposed into a component force F2 in the direction parallel to the axis of the first connecting shaft 24 and a component force F3 perpendicular to the axis of the first connecting shaft 24. The component force F2 enables an interaction force having the magnitude of F2 to be generated between the second end surface d of the first braking member 221 and the fixed base 21, and the component force F3 enables an interaction force having the magnitude of F3 to be generated between the inner wall surface a of the first braking member 221 and the outer wall surface of the first connecting shaft 24. Also, F3 = F1 / tanθ 1 , and F2 = F3*tanθ 3 , that is, F2 = (F1 / tanθ 1 )*tanθ 3 . F1 is equal to the pressing force of the pressing member 29, and the resultant force Fn 2 is equal to F2 / sinθ 3 . In one embodiment, appropriate angles of θ 1 and θ 3 are set so that F2 can be greater than F1. Furthermore, the resultant force Fn 2 is also greater than F1.

[0101] Therefore, compared with the prior art, in this solution, the resultant force Fn of the first rolling element 26 with respect to the first braking member 221 2is greater than the pressing force F1 of the pressing member 29, and the component force F2 parallel to the direction of the first connecting shaft 24 generated by the first rolling element 26 with respect to the first braking member 221 is greater than the pressing force F1 of the pressing member 29. In this way, the acting force generated on the first braking member 221 by the pressing force F1 of the pressing member 29 is amplified, and the braking force in the rotation process of the first braking member 221 increases. Therefore, the first braking swing arm 22 can stably stop at an arbitrary position between the folded position and the deployed position in the folded position or the deployed position, the braking feedback obtained when the user rotates the first braking swing arm 22 is improved, and the comfort obtained when the user rotates the first braking swing arm 22 is improved.

[0102] As shown in FIGS. 23 and 29 and understood with reference to FIG. 6, the second recess 225 of the first braking member 221 has a second bottom surface perpendicular to the axis of the first connecting shaft 24 and a second transition surface m connected to the second bottom surface and the guide surface j of the protrusion 224. The second transition surface m is inclined toward the end of the protrusion 224 facing away from the first braking member 221.

[0103] When the first braking swing arm 22 rotates from the intermediate position to the deployment position under the action of an external force, the first rolling element 26 rolls from the guide surface j to the second transition surface m. In this case, the first rolling element 26 loses the support of the guide surface j, and thereby, the first rolling element 26 rolls along the second transition surface m to the second recess 225. The sliding member 28 moves toward the first end face c of the first braking member 221 under the action of the pressing member 29. Also, the first rolling element 26 rolls in a direction opposite to the first connecting shaft 24 under the pressing action of the sliding member 28. In this case, the first rolling element 26 receives the supporting force of the second transition surface m. The first rolling element 26 applies a torsional force Fa’ (in this case, the direction of the torsional force Fa’ is the same as the rotation direction of the first braking swing arm 22) to drive the first braking member 221 to rotate toward the deployment position to the second transition surface m. For the magnitude of the torsional force Fa’ and the magnitudes of the component forces in different directions, refer to the analysis of Fa described above. When the first transition surface h and the second transition surface m are symmetrically provided, Fa and Fa’ have the same magnitude. In this way, the first braking swing arm 22 can automatically roll into the second recess 225 under the action of pushing the first rolling element 26, and thereby, when the first braking swing arm 22 approaches the deployment position, it can be automatically deployed without the need to apply an external force.

[0104] When the first braking swing arm 22 rotates from the deployment position to the intermediate position, the torsional force Fa’ (in this case, the direction of the torsional force Fa’ is opposite to the rotation direction of the first braking swing arm 22) applied to the second transition surface m by the first rolling element 26 functions to prevent the rotation of the first braking swing arm 22. Also, the first rolling element 26 further applies a component force F2’ parallel to the axis of the first connecting shaft 24 and a component force F4’ perpendicular to the axis of the first connecting shaft 24 to the second transition surface m. This increases the frictional force applied to the first braking member 221. In this way, the braking force generated when the first braking swing arm 22 rotates from the deployment position to the intermediate position increases. The comfort obtained when the first braking swing arm 22 rotates can be improved. Also, the first braking swing arm 22 can be stably held in the deployment position.

[0105] Furthermore, arcuate corners are provided at the joints between the second transition surface m and the second bottom surface of the second recess 225 and between the second transition surface m and the guide surface j, and the corner between the second transition surface m and the tangent surface of the side edge of the guide surface j is provided as an obtuse angle. In this way, the process of the first rolling element 26 rolling from the guide surface j to the second recess 225 becomes smoother, and the process of the first braking swing arm 22 rotating from the intermediate position to the deployed position becomes smoother. Therefore, the sense of jerk in the rotation process of the first braking swing arm 22 is reduced, and the comfort of rotating the first braking swing arm 22 is improved.

[0106] As shown in FIGS. 23 and 28 and understood with reference to FIG. 6, when the first braking swing arm 22 is in the deployed position, the first rolling element 26 abuts against the second recess 225 of the first braking member 221. In this case, the second transition surface m of the second recess 225 faces the contact surface e of the fixed base 21 and clamps the first rolling element 26. This restricts the movement of the first rolling element 26 in the direction of the axis of the first connecting shaft 24. Further, the second transition surface m forms a torsional force Fa' (in this case, the direction of the torsional force Fa' is opposite to the rotation direction of the first braking swing arm 22) that prevents the rotation of the first braking member 221 with respect to the first braking member 221 using the first rolling element 26. In this way, the first braking member 221 is clamped by the sliding member 28 using the first rolling element 26, and a braking force is formed that restricts the rotation of the first braking member 221 with respect to the first connecting shaft 24. Therefore, the first braking swing arm 22 is stably held in the deployed position.

[0107] Those skilled in the art can understand that when the first braking swing arm 22 rotates from the deployed position to the folded position, the first rotating arm 41 can also stop at any intermediate position. When the first braking swing arm 22 rotates from the intermediate position to the folded position or the deployed position under the action of an external force, the first braking swing arm 22 can also be automatically folded or deployed when approaching the folded position or the deployed position without the need to apply an external force.

[0108] It is obvious that those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. This application is intended to include these modifications and variations as long as they are within the scope defined by the claims of this application and equivalent technologies thereof.

Explanation of Reference Signs

[0109] 1 Folding Electronic Device 11 First Main Body 12 Second Main Body 20 Hinge Device 21 Fixed Base e Contact Surface 22 First Braking Rocking Arm 221 First Braking Member a Inner Wall Surface b Outer Wall Surface c First End Face d Second End Face 222 Second Braking Member 223 First Recess 2231 First Opening f First Bottom Surface g First Side Surface h First Transition Surface i Second Side Surface 224 Protrusion 2241 First End 2242 Second End j Guide Surface 2243 First Edge 2244 Second Edge 225 Second Recess k Third Side Surface m Second Transition Surface n Fourth Side Surface 23 Second Braking Rocking Arm 24 First Connecting Shaft 25 Second Connecting Shaft 26 First Rolling Element 27 Second Rolling Element 28 Sliding Member 29 Pressing member 281 Contact portion p Pressing surface p1 First end p2 Second end 31 First connecting member 32 Second connecting member 40 Synchronization mechanism 41 First rotating arm 42 Second rotating arm 43 Transmission assembly 411 First transmission gear 421 Second transmission gear L Length direction

Claims

1. A fixed base, A braking swing arm, at one end of the braking swing arm, at least one braking member is arranged, and any one of the at least one braking member is rotatably connected to the fixed base, whereby the braking swing arm rotates back and forth about an axis with respect to the fixed base to switch the braking swing arm between a folded position and a deployed position. The braking member has a first recess, a protrusion, and a second recess connected in sequence in the circumferential direction of the braking member. The protrusion has a guide surface inclined with respect to the axis, a braking swing arm, A rolling element and a pressing device, the pressing device abuts against the rolling element, and the rolling element abuts against the first recess, the protrusion, or the second recess of the braking member, whereby the pressing device applies a contact pressure to the braking member using the rolling element, a rolling element and a pressing device, Comprising, When the braking swing arm is in the folded position, the rolling element abuts against the first recess, When the braking swing arm is in the deployed position, the rolling element abuts against the second recess, or, When the braking swing arm rotates from the folded position or the deployed position to a position between the folded position and the deployed position, the rolling element rolls from the first recess or the second recess to the guide surface of the protrusion and abuts against the guide surface. Accordingly, the pressing device moves together with the rolling element, whereby the pressing device is pressed in a direction opposite to the braking member along the axis, A braking mechanism.

2. The pressing device is, A sliding member, the sliding member is slidably connected to the fixed base and is located at one end of the braking member. Thus, the sliding member slides with respect to the fixed base in a direction approaching the braking member or in a direction opposite to the braking member along the axis. A contact portion is arranged on the sliding member, the contact portion has a pressing surface, and the rolling element abuts against the pressing surface of the contact portion so as to roll, a sliding member, A pressing member, the pressing member is arranged on a side of the sliding member facing away from the one end of the braking member, and applies a pressing force to the sliding member, a pressing member, Comprising, When the braking swing arm rotates from the folded position or the deployed position to the position between the folded position and the deployed position, the rolling element rolls from the first recess or the second recess onto the guide surface of the protrusion. Accordingly, the sliding member moves together with the rolling element, whereby the sliding member slides in a direction opposite to the braking member with respect to the fixed base and presses the pressing member in a direction opposite to the braking member. The braking mechanism according to claim 1.

3. The first recess, the protrusion, and the second recess are located on the outer wall surface of the side wall of the braking member, and the surface of the protrusion facing away from the axis is the guide surface. The contact portion of the sliding member is located on the side facing away from the axis of the first recess, the protrusion, and the second recess. The fixed base has a contact surface arranged toward the first recess, the protrusion, and the second recess, and the contact surface contacts the side of the rolling element facing away from the axis and / or the side of the contact portion facing away from the axis, whereby the rolling element contacts the outer wall surface of the side wall of the braking member in a direction facing the axis. The braking mechanism according to claim 2.

4. The protrusion uses a wedge-shaped curved surface structure, and the protrusion has a first end close to the one end of the braking member and a second end facing away from the one end of the braking member. The thickness of the protrusion increases in the direction from the first end to the second end. The braking mechanism according to claim 3.

5. The guide surface is provided in an arc shape in the circumferential direction of the braking member. The braking mechanism according to claim 4.

6. The protrusion is located on both sides of the guide surface and has a first transition surface and a second transition surface connected to the guide surface. The first transition surface is further connected to the bottom surface of the first recess, and the second transition surface is further connected to the bottom surface of the second recess. Both the first transition surface and the second transition surface are inclined toward the first end of the protrusion. When the braking swing arm rotates from the folded position or the deployed position to the position between the folded position and the deployed position, the rolling element moves along the first transition surface or the second transition surface in the direction facing the first end of the protrusion, rolls on the guide surface, and presses the pressing surface of the contact portion. As a result, the sliding member moves relative to the fixed base in the direction facing the pressing member along the axis. The braking mechanism according to claim 4.

7. Arc-shaped corners are provided at the joints between the first transition surface and the first recess and between the first transition surface and the guide surface, respectively. The corner between the first transition surface and the tangential curved surface of the side edge of the guide surface is provided as an obtuse angle. Arc-shaped corners are provided at the joints between the second transition surface and the second recess and between the second transition surface and the guide surface, respectively. The corner between the second transition surface and the tangential curved surface of the other side edge of the guide surface is provided as an obtuse angle. The braking mechanism according to claim 6.

8. The first recess, the protrusion, and the second recess are arranged on the end surface of the side wall of the braking member. The surface of the protrusion facing the axis is the guide surface. The contact portion of the sliding member is located on the side opposite to the end surface of the braking member of the first recess, the protrusion, and the second recess, abuts on the side opposite to the guide surface of the rolling element, and the pressing surface of the contact portion is inclined with respect to the axis. The fixed base has a contact surface arranged facing the first recess, the protrusion, and the second recess. The contact surface abuts on the side opposite to the end surface of the braking member of the rolling element along the axis. When the braking swing arm rotates from the folded position or the deployed position to the position between the folded position and the deployed position, the rolling element presses the pressing surface of the contact portion in the direction facing the axis. As a result, the sliding member slides relative to the fixed base in the direction opposite to the braking member. The braking mechanism according to claim 2.

9. The pressing surface has a first end and a second end, and the pressing surface extends from the first end to the second end in a direction perpendicular to the axis and facing away from the axis, and extends in a direction facing the inside of the sliding member along the axis. Thus, the extending direction of the pressing surface from the first end to the second end is inclined with respect to the axis. The braking mechanism according to claim 8.

10. The guiding surface of the protrusion has a first edge located on the end surface of the braking member and a second edge facing away from the end surface of the braking member. The distance between the guiding surface and the axis increases in the direction from the first edge to the second edge. The braking mechanism according to claim 8.

11. The guiding surface is provided in an arc shape in the circumferential direction of the braking member. The braking mechanism according to claim 10.

12. The protrusion is located on both sides of the guiding surface and has a first transition surface and a second transition surface connected to the guiding surface. The first transition surface is further connected to the bottom surface of the first recess, and the second transition surface is further connected to the bottom surface of the second recess. When the braking swing arm rotates from the folded position or the deployed position to the position between the folded position and the deployed position, the rolling element rolls along the first transition surface or the second transition surface to the guiding surface, and the first transition surface or the second transition surface of the protrusion and the abutting surface of the fixed base press the rolling element against each other. Thus, the rolling element moves in a direction perpendicular to the axis and approaching the axis, presses the pressing surface of the contact portion, and the sliding member moves in a direction along the axis and facing the pressing member with respect to the fixed base. The braking mechanism according to claim 10.

13. Arc-shaped corners are respectively provided at the joint between the first transition surface and the first recess and at the joint between the first transition surface and the guiding surface. The corner between the first transition surface and the tangential curved surface of the side edge of the guiding surface is provided as an obtuse angle. Arc-shaped corners are respectively provided at the joint between the second transition surface and the second recess and at the joint between the second transition surface and the guiding surface. The corner between the second transition surface and the tangential curved surface of the other side edge of the guiding surface is provided as an obtuse angle. The braking mechanism according to claim 12.

14. A connecting shaft is disposed on the fixed base. The braking member uses a sleeve structure and is sleeved on the connecting shaft. The braking member is rotatably connected to the connecting shaft. Thus, the braking swing arm rotates back and forth about the connecting shaft with respect to the fixed base, and the axis is the axis of the connecting shaft. The braking mechanism according to claim 2.

15. The sliding member is slidably connected to the connecting shaft and can move along the axis of the connecting shaft. The side of the sliding member facing the pressing member is provided in a planar shape. The braking mechanism according to claim 14.

16. The pressing member is an elastic member. The elastic member is sleeved on the connecting shaft and is elastically deformed along the axis of the connecting shaft to apply the pressing force to the sliding member. The braking mechanism according to claim 14.

17. Two braking members arranged symmetrically are disposed at the one end of the braking swing arm. A rolling body and a pressing device are disposed at each of two ends along the axis at the one end of the braking swing arm corresponding to the two braking members. The braking mechanism according to any one of claims 1 to 16.

18. A hinge device comprising the braking mechanism according to any one of claims 1 to 17.

19. The hinge device according to claim 18, comprising two braking mechanisms arranged symmetrically.

20. A foldable electronic device comprising a first body and a second body and further comprising the hinge device according to claim 18 or 19, wherein the hinge device is configured to drive the first body and the second body to be deployed or folded with respect to each other.

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