Folding mobile terminal and cam-synchronized dual-axis hinge mechanism applied thereto

Abstract

A folding mobile terminal and a cam-synchronized dual-axis hinge mechanism. The cam-synchronized dual-axis hinge mechanism comprises a first shaft (1) and a second shaft (2) parallel to each other, wherein a cam-synchronized reverse rotation connecting structure is connected between the first shaft (1) and the second shaft (2), and the cam-synchronized reverse rotation connecting structure comprises a first synchronous cam set and a second synchronous cam set, the first synchronous cam set and the second synchronous cam set being connected to the first shaft (1) and the second shaft (2), respectively, such that the first shaft (1) and the second shaft (2) synchronously rotate in opposite directions; and double-peak cams are used as synchronous cams in the first synchronous cam set and the second synchronous cam set, such that between mating synchronous cams, there are two pairs of mating faces (100) in contact with and mating with each other at the same time.

Description

Foldable mobile terminal and cam-synchronized dual-axis hinge mechanism used thereon Technical Field

[0001] The present invention relates to a foldable mobile terminal and a biaxial hinge mechanism used therein. The foldable mobile terminal may be a flexible screen mobile terminal. Background Art

[0002] Currently, the requirements for thickness control in mobile devices such as laptops and mobile phones are becoming increasingly stringent. The synchronization mechanism in the hinge is a limiting factor in reducing thickness. Using a synchronization cam as a synchronization mechanism is more advantageous than using gears. However, synchronization cams are difficult to manufacture and can easily cause motion gaps due to precision errors, affecting the user experience. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a cam-synchronized dual-axis hinge mechanism for use in a foldable mobile terminal. Based on the use of a synchronous cam as a synchronization mechanism, the present invention can avoid the impact of precision on the performance. To this end, the present invention adopts the following technical solutions:

[0004] A cam-synchronized dual-axis hinge mechanism used in a foldable mobile terminal includes a first axis and a second axis in parallel, a cam-synchronized reverse rotation connection structure connected between the first axis and the second axis, and the cam-synchronized reverse rotation connection structure includes a first synchronization cam group and a second synchronization cam group, the first synchronization cam group and the second synchronization cam group are respectively connected to the first axis and the second axis, so that the first axis and the second axis rotate synchronously in the opposite direction; it is characterized in that the synchronization cams in the first synchronization cam group and the second synchronization cam group adopt double-peak cams, so that there are two pairs of mating surfaces in contact and mating with each other between the mating synchronization cams.

[0005] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0006] The cam synchronous reverse rotation connection structure is provided with a pressing elastic mechanism, which presses the synchronous cams in the first synchronous cam group into a tight fit, and presses the synchronous cams in the second synchronous cam group into a tight fit.

[0007] The compression elastic mechanism adopts a spring group, the springs in the spring group are respectively sleeved on the first shaft and the second shaft, and the first synchronous cam group and the second synchronous cam group are respectively sleeved on the first shaft and the second shaft.

[0008] The first synchronous cam group and the second synchronous cam group are symmetrically arranged in opposite directions.

[0009] The cam synchronous reverse rotation connection structure is provided with a clamping elastic mechanism, which clamps the synchronous cams in the first synchronous cam group and the synchronous cams in the second synchronous cam group; the synchronous cams in the first synchronous cam group and the second synchronous cam group include a first rotating cam, a second rotating cam and a sliding cam, the first rotating cam and the second rotating cam are connected to the shaft and rotate synchronously, the sliding cam is located between the first rotating cam and the second rotating cam, the two ends of the sliding cam are respectively in contact with the first rotating cam and the second rotating cam using the two pairs of mating surfaces, and the sliding cams in the first synchronous cam group and the second synchronous cam group are connected by a connecting structure and slide synchronously in the same direction.

[0010] The connecting structure is a concave arc-shaped connecting plate or a connecting block with a concave top surface.

[0011] The second rotating cam is located at the end close to the clamping elastic mechanism, and a first torsion cam is arranged between the second rotating cam and the clamping elastic mechanism. The first torsion cams of the first synchronous cam group and the second synchronous cam group are respectively sleeved on the first shaft and the second shaft, and are respectively slidably connected to the first shaft and the second shaft, and the first shaft and the second shaft can rotate relative to the first torsion cam; the second rotating cam is provided with a second torsion cam at the end close to the clamping elastic mechanism, and the clamping spring mechanism also presses the first torsion cam and the second torsion cam into fit.

[0012] According to a second aspect of the present invention, the present invention provides a foldable mobile terminal provided with the above-mentioned cam-synchronized dual-axis hinge mechanism.

[0013] Furthermore, the foldable mobile terminal is an inward-folding flexible screen mobile terminal, including a left shell and a right shell, and the left shell and the right shell are respectively connected to the rotating cams in the first synchronous cam group and the second synchronous cam group.

[0014] Due to the adoption of the technical solution of the present invention, the present invention can be conducive to providing a foldable mobile terminal with a relatively thin thickness and a good user experience. The dual-axis reverse rotation connection is achieved through the symmetrical and oppositely arranged double-peak synchronization cams, which not only solves the thickness restriction problem brought by the gear synchronization mechanism and the problem of non-complete synchronization of rotation caused by the size meshing gap. At the same time, the force is evenly distributed by the cam. Furthermore, by introducing elastic components into the synchronization cam, the problem of the impact of accuracy on the use effect can be improved. At the same time, the spring can greatly compensate for the problem of increased clearance caused by wear of parts after long-term use. Furthermore, it can cooperate with the double-peak synchronization cam to make the rotation smoother and further improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of a cam-synchronized dual-axis hinge mechanism of the present invention.

[0016] FIG. 2 is a diagram illustrating the hinge movement process corresponding to the process from folding to flattening of the foldable mobile terminal.

[0017] FIG3 is an exploded view of the cam-synchronized dual-axis hinge mechanism of the present invention.

[0018] FIG. 4 is a diagram illustrating the changes in the coordination of the synchronous cams corresponding to the process from folding to flattening of the foldable mobile terminal.

[0019] FIG5 is a schematic diagram showing the coordination of the double-peak synchronous cam of the present invention.

[0020] FIG6 is a schematic diagram of the expansion of the double-peak synchronous cam of the present invention. DETAILED DESCRIPTION

[0021] Referring to the accompanying drawings, the present invention provides a cam-synchronized dual-axis hinge mechanism for use in a foldable mobile terminal, comprising a first axis 1 and a second axis 2, parallel to each other, wherein a cam-synchronized counter-rotation connection structure is connected between the first axis 1 and the second axis 2. The cam-synchronized counter-rotation connection structure comprises a first synchronous cam group and a second synchronous cam group, which are respectively connected to the first axis 1 and the second axis 2, thereby causing the first axis 1 and the second axis 2 to rotate synchronously in opposite directions.

[0022] As shown in detail in Figures 5 and 6, the synchronous cams in the first synchronous cam group and the second synchronous cam group adopt double-peak cams. Along the circumferential direction, there are two groups of synchronous matching cam surfaces, marked with A and B respectively. The synchronous matching cam surfaces A and B are identical and are arranged in sequence along the circumferential direction, so that there are two pairs of matching surfaces 100 in contact and matching between the matching synchronous cams at the same time, and the matching surfaces 100 of each pair have the same curvature and change rate.

[0023] The cam synchronous counter-rotation connection structure is provided with a compression elastic mechanism that compresses the synchronization cams in the first synchronization cam group and the synchronization cams in the second synchronization cam group. In this embodiment, the compression elastic mechanism is a spring group, and the spring 3 in the spring group is respectively mounted on the first shaft 1 and the second shaft 2. The first synchronization cam group and the second synchronization cam group are respectively mounted on the first shaft and the second shaft.

[0024] The synchronous cams in the first synchronous cam group and the second synchronous cam group include a first rotating cam 41, a second rotating cam 42 and a sliding cam 43. The first rotating cam 41 and the second rotating cam 42 are connected to the shaft and rotate synchronously, for example, they are connected to the first shaft 1 or the second shaft 2 through a flat connection.

[0025] The sliding cam 43 is located between the first rotating cam 41 and the second rotating cam 42. The two ends of the sliding cam 43 respectively contact and mate with the first rotating cam 41 and the second rotating cam 42 using the two pairs of mating surfaces 100. The sliding cams 43 in the first and second synchronous cam groups are connected by a connecting structure, allowing them to slide synchronously in the same direction. The first and second synchronous cam groups are symmetrically arranged in opposite directions. That is, the cam curves of the first rotating cams 41 of the first and second synchronous cam groups are identical but in opposite directions, the cam curves of the second rotating cams 42 of the first and second synchronous cam groups are identical but in opposite directions, and the cam curves of the sliding cams 43 of the first and second synchronous cam groups on the same ends are identical but in opposite directions.

[0026] For mobile terminals with inward-folding flexible screens, the structure of the present invention, compared to a synchronous reverse transmission structure with gears, can replace the intermediate gear with the connecting structure. Furthermore, the shape of the connecting structure can be designed to adapt to the curved shape of the flexible screen, and its width and length can be freely adjusted, further contributing to the thinning of the mobile terminal. In this embodiment, the connecting structure is a concave arc-shaped connecting plate 44 or a connecting block with a concave top surface.

[0027] The second rotating cam 42 is located at the end close to the clamping elastic mechanism, and the first torque cam 6 is arranged between the second rotating cam 42 and the clamping elastic mechanism. The first torque cams 6 of the first synchronous cam group and the second synchronous cam group are respectively sleeved on the first shaft 1 and the second shaft 2, and are respectively slidably connected to the first shaft 1 and the second shaft 2, and the first shaft 1 and the second shaft 2 can rotate relative to the first torque cam 6; the second rotating cam 42 is provided with a second torque cam 421 at the end close to the clamping elastic mechanism, and the clamping spring mechanism also presses the first torque cam 6 and the second torque cam 421 together, and the first torque cam 41 and the second torque cam 42 cooperate to output the rotational resistance torque.

[0028] As previously mentioned, the foldable mobile terminal of this embodiment takes an inward-folding flexible screen mobile terminal as an example. The inward-folding flexible screen mobile terminal includes a left shell and a right shell. The left shell and the right shell are respectively connected to the rotating cams of the first synchronization cam group and the second synchronization cam group. The connection can be fixed, slidably, directly, or connected by a connecting structure. In this embodiment, the rotating cams of the first synchronization cam group and the second synchronization cam group are provided with a connecting handle 45. The left shell and the right shell are respectively slidably connected to the connecting handle 45 of the rotating cams of the first synchronization cam group and the second synchronization cam group via a fixed block 5.

[0029] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the field of the present invention are included in the protection scope of the present invention.

[0030] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] In the description of the present invention, it should be understood that terms such as "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first" and "second" are used solely for brevity and are not intended to indicate or imply relative importance.

Claims

1. A cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal, comprising a first axis and a second axis that are parallel, a cam synchronous reverse rotation connection structure is connected between the first axis and the second axis, the cam synchronous reverse rotation connection structure includes a first synchronous cam group and a second synchronous cam group, the first synchronous cam group and the second synchronous cam group are respectively connected to the first axis and the second axis, so that the first axis and the second axis rotate synchronously and in opposite directions; characterized in that The synchronous cams in the first synchronous cam group and the second synchronous cam group are double-peak cams, so that there are two pairs of mating surfaces in contact between the mating synchronous cams at the same time.

2. The cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal according to claim 1, wherein The cam synchronous reverse rotation connection structure is provided with a pressing elastic mechanism, and the pressing elastic mechanism presses and fits the synchronous cams in the first synchronous cam group and presses and fits the synchronous cams in the second synchronous cam group.

3. The cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal according to claim 2, characterized in that The pressing elastic mechanism adopts a spring group. The springs in the spring group are respectively sleeved on the first shaft and the second shaft, and the first synchronous cam group and the second synchronous cam group are respectively sleeved on the first shaft and the second shaft.

4. The cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal according to claim 1, wherein The first synchronous cam group and the second synchronous cam group are symmetrically arranged in opposite directions.

5. The cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal as claimed in claim 1 or 4, characterized in that The cam synchronous reverse rotation connection structure is provided with a pressing elastic mechanism, and the pressing elastic mechanism presses and fits the synchronous cams in the first synchronous cam group and presses and fits the synchronous cams in the second synchronous cam group; the synchronous cams in the first synchronous cam group and the second synchronous cam group include a first rotating cam, a second rotating cam and a sliding cam. The first rotating cam and the second rotating cam are connected to the shaft and rotate synchronously. The sliding cam is located between the first rotating cam and the second rotating cam. The two ends of the sliding cam are respectively in contact with the first rotating cam and the second rotating cam by the two pairs of mating surfaces. The sliding cams in the first synchronous cam group and the second synchronous cam group are connected by a connection structure and slide synchronously in the same direction.

6. The cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal as claimed in claim 5, wherein The connection structure is a concave arc-shaped connecting plate or a connecting block with a concave top surface.

7. The cam synchronous biaxial hinge mechanism applied to a foldable mobile terminal according to claim 5, wherein The second rotating cam is located at the end close to the pressing elastic mechanism. A first torsion cam is arranged between the second rotating cam and the pressing elastic mechanism. The first torsion cams of the first synchronous cam group and the second synchronous cam group are respectively sleeved on the first shaft and the second shaft and are respectively slidably connected to the first shaft and the second shaft. The first shaft and the second shaft can rotate relative to the first torsion cam; a second torsion cam is arranged at the end of the second rotating cam close to the pressing elastic mechanism, and the pressing spring mechanism also presses and fits the first torsion cam and the second torsion cam at the same time.

8. Foldable mobile terminal, characterized in that The foldable mobile terminal is provided with the cam synchronous biaxial hinge mechanism according to claim 1.

9. The foldable mobile terminal according to claim 8, wherein The foldable mobile terminal is an in-fold flexible screen mobile terminal, including a left housing and a right housing. The left housing and the right housing are respectively connected to the rotating cams in the first synchronous cam group and the second synchronous cam group.

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