Refer to FIG. 1A. A body 2 of the mobile phone with an inward foldable screen can be folded to one side of a foldable display screen 3, and the foldable display screen 3 is hidden on an inner side of the body 2 after the body 2 is folded, so that the foldable display screen 3 is hidden in a folded state of the body 2 and a normal straight screen is presented in an unfolded state of the body 2. A body 2 of the mobile phone with an outward foldable screen can be folded to a back side of a foldable display screen 3, and the foldable display screen 3 surrounds the body 2 after the body 2 is folded, so that the foldable display screen 3 surrounds the body 2 in a folded state of the body 2 to form a surrounding screen, and a normal straight screen is presented in an unfolded state of the body 2.

FIG. 2 is a schematic diagram of a structure of a mobile phone with an inward foldable screen in an unfolded state. FIG. 2 is a schematic diagram of a mobile phone with an inward foldable screen in an unfolded state in an xz plane. The mobile phone with an inward foldable screen may include: a body 2 and a foldable display screen 3, and the foldable display screen 3 is attached to one surface of the body 2. For a mobile phone with an inward foldable screen that can be folded once, a body 2 of the mobile phone may include a first frame 50 and a second frame 60, and the first frame 50 and the second frame 60 are respectively disposed on two sides of a rotation mechanism 1. When a user applies force to the body 2 to rotate the first frame 50 and the second frame 60, the first frame 50 and the second frame 60 may be rotated around the rotation mechanism 1, to implement unfolding and folding. An outer screen 4 is further attached to another surface of one frame (for example, the second frame 60) in the body 2, so that after the foldable display screen 3 is hidden in a folded state of the body 2, the mobile phone with an inward foldable screen can still achieve a normal straight screen effect through the outer screen 4.

FIG. 3 is a schematic diagram of a complete structure of a rotation mechanism. As shown in FIG. 3, the rotation mechanism 1 may include a shaft cover 30, and a sliding groove bracket 20 and a primary swing arm 10 that are disposed on the shaft cover 30. In addition, the rotation mechanism 1 further includes a secondary swing arm 70, and the secondary swing arm 70 is configured to control a closed form of a foldable display screen of an electronic device. The secondary swing arm 70 in FIG. 3 is marked with xxx for more clearly distinguishing the secondary swing arm 70 from the primary swing arm 10. A first frame 50 and a second frame 60 that can rotate around the rotation mechanism 1 are further connected to two sides of the rotation mechanism 1. A sliding groove formed by the sliding groove bracket 20 is slidably connected to sliding portions on two sides of one end of the corresponding primary swing arm 10, and the other end of the primary swing arm 10 is connected to the first frame 50 (or the second frame 60) on a corresponding side via a connecting block. The primary swing arm 10 connected to the first frame 50 and the second frame 60 may slide back and forth in a corresponding sliding groove to implement opening and closing of a body. To prevent the primary swing arm 10 from being disengaged from the sliding groove in a closing process, an anti-disengagement structure is usually required to be disposed on the rotation mechanism 1. It should be noted that, there may be a plurality of primary swing arms 10 and secondary swing arms 70, and the primary swing arms 10 and the secondary swing arms 70 are arranged according to a preset rule. For example, the primary swing arms 10 and the secondary swing arms 70 are alternately arranged on one side of the rotation mechanism 1 in a y direction of the electronic device, and the primary swing arms 10 and the secondary swing arms 70 are oppositely arranged in an x direction parallel to the electronic device. A specific arrangement manner of the primary swing arms 10 and the secondary swing arms 70 is not limited in this embodiment of this application. Only a single primary swing arm 10 is used as an example for specific description in the following.

FIG. 4 is a schematic diagram of a primary swing arm at a closed position in a conventional rotation mechanism. FIG. 5 is a schematic diagram of a primary swing arm at an unfolded position in a conventional rotation mechanism. As shown in FIG. 4 and FIG. 5, a rotation mechanism 100 in a related technology includes a protruding portion 112 disposed on a sliding portion 111 of a primary swing arm 110. The protruding portion 112 can slide along a limiting groove L in a sliding groove bracket 120 to a stop portion 121 disposed on the sliding groove bracket 120 when the primary swing arm 110 is closed, to limit sliding of the primary swing arm 110 Refer to FIG. 4 and FIG. 5. The conventional protruding portion 112 is disposed on one side of the sliding portion 111 facing away from a front surface of the sliding groove bracket 120, so that the protruding portion 112 and the sliding portion 111 form a bent structure facing an inner wall of a sliding groove 122. It may be understood that, the limiting groove L is formed on the inner wall of the sliding groove 122 and extends horizontally inward. In this way, for ease of assembly in such an anti-disengagement structure, generally, the sliding groove bracket 120 is of a disassembled structure, and mainly includes an upper bracket 123 and a lower bracket 124. The upper bracket 123 and the lower bracket 124 are configured to form the sliding groove 122 adapted to the sliding portion 111.

During assembly of the rotation mechanism 100, the lower bracket 124 may be first mounted on a shaft cover 130, and then the primary swing arm 110 is mounted on the lower bracket 124. Specifically, the sliding portion 111 is embedded into the sliding groove 122, the protruding portion 112 is inserted into the limiting groove L, and finally, the upper bracket 123 is correspondingly soldered to a preset position of the lower bracket 124, to form the sliding groove 122 adapted to the primary swing arm 110.

However, because the sliding groove bracket 120 is of a disassembled structure with a large quantity of parts, an overall fit tolerance chain is long. In addition, because there is a tolerance in a soldering process, after the upper bracket 123 is correspondingly soldered at the preset position of the lower bracket 124, a position of the upper bracket 123 relative to the position of the lower bracket 124 may exist a certain offset, resulting in an increase in a width of the sliding groove 122, so that a fit clearance between the sliding portion 111 of the primary swing arm 110 and the sliding groove 122 is increased, the primary swing arm 110 is easy to shake during sliding, and user experience is affected.

An embodiment of this application provides a rotation mechanism and a foldable electronic device. A sliding groove bracket is designed as an integral structure, so that a quantity of parts can be reduced, and a case in which a width of a sliding groove is increased due to an assembly problem can also be avoided. In addition, a primary swing arm that has a protruding portion on a first end surface and that is adapted to the sliding groove bracket of the integral structure is further correspondingly provided, so that the primary swing arm having the protruding portion can be ensured to be disposed in the sliding groove bracket of the integral structure, and the protruding portion is fitted with a stop portion disposed on a shaft cover or the sliding groove bracket, to prevent the primary swing arm from being disengaged.

The solutions provided in this application are described below with reference to the accompanying drawings by using the embodiments.

FIG. 6 is a schematic diagram of a structure of a rotation mechanism when a primary swing arm is at a closed position according to an embodiment of this application. FIG. 7 is a schematic diagram of a structure of a rotation mechanism when a primary swing arm is at an unfolded position according to an embodiment of this application. FIG. 8 is a schematic diagram of a structure of a primary swing arm according to an embodiment of this application. View a is a diagram of a structure of a primary swing arm 10 at one angle, and view b is a diagram of a structure of the primary swing arm 10 at another angle. FIG. 9 is a schematic diagram of a structure of a sliding groove bracket and a stop portion according to an embodiment of this application. FIG. 10 is a schematic diagram of a cross-section of a rotation mechanism formed by assembling the structures shown in FIG. 8 and FIG. 9 in a closed state. FIG. 11 is a schematic diagram of a cross-section of the rotation mechanism shown in FIG. 10 in an unfolded state. Refer to FIG. 6 to FIG. 11. A rotation mechanism 1 provided in embodiments of this application includes a primary swing arm 10, a sliding groove bracket 20, and a shaft cover 30. The primary swing arm 10 includes a first end a and a second end b that are oppositely arranged in a length direction, and the second end b is configured to be connected to a frame (for example, a first frame 50 or a second frame 60) of an electronic device. The primary swing arm 10 includes a sliding portion 11 and a protruding portion 12. The protruding portion 12 is disposed on a first end surface al of the two ends of the primary swing arm 10 that are oppositely arranged in the length direction, and the sliding portion 11 is disposed on a side surface opposite to the primary swing arm 10 in a width direction.

The sliding groove bracket 20 has a sliding groove 21 adapted to the sliding portion 11 and a slideway 22 configured to accommodate the protruding portion 12. The slideway 22 is an arc-shaped groove. When the sliding portion 11 slides back and forth in the sliding groove 21, the protruding portion 12 slides along the slideway 22, and the sliding groove bracket 20 is of an integral structure. The shaft cover 30 is located on one side of the sliding groove bracket 20 facing away from the primary swing arm 10. One of the shaft cover 30 and the sliding groove bracket 20 is provided with a stop portion 40 (referring to FIG. 9 to FIG. 11). The stop portion 40 protrudes from an inner surface of the shaft cover 30 facing the sliding groove bracket 20, and is located at one end of the slideway 22 close to an edge of the sliding groove bracket 20. When the primary swing arm 10 rotates from an unfolded position to a closed position, the protruding portion 12 is fitted with the stop portion 40, to prevent the primary swing arm 10 from being disengaged from one end of the sliding groove 21 close to the edge of the sliding groove bracket 20.

In an implementation, refer to FIG. 9. One side of the stop portion 40 provided in this embodiment of this application facing the slideway 22 has a first end surface 41. When the primary swing arm 10 rotates from the unfolded position to the closed position, the protruding portion 12 abuts against the first end surface 41. In this way, the protruding portion 12 and the stop portion 40 are not easy to slide or offset at an abutted position, and the abutment is more stable and firm.

Refer to FIG. 8. In an implementation, the primary swing arm 10 includes two sliding portions 11, and the two sliding portions 11 are respectively disposed on two opposite sides of the first end a in the width direction. The protruding portion 12 may be disposed at a central position of the first end a of the primary swing arm 10. In this way, a structure of the primary swing arm 10 may be more symmetrical, so that force is more evenly distributed during rotation, thereby facilitating improvement of hand feel of a user. In another implementation, a recessed portion may be formed in a direction in which the first end surface al of the primary swing arm 10 faces the second end b, the protruding portion 12 may be disposed at a central position of the recessed portion, and one end of the protruding portion 12 extends out of a surface of the recessed portion. Alternatively, the protruding portion 12 may not be disposed at the central position of the first end a. A specific position of the protruding portion 12 on the first end surface al is not limited in this embodiment of this application.

In an implementation, as shown in FIG. 8, the protruding portion 12 may be integrally formed and disposed on the first end surface al of the primary swing arm 10. In this way, the protruding portion 12 is integrally formed with the primary swing arm 10. This is easy for processing and not easy to be disengaged, and reliability of the structure is high. In another implementation, the protruding portion 12 may alternatively be soldered or may be detachably connected to the primary swing arm 10. This is not specifically limited in this embodiment of this application.

Refer to FIG. 9. The sliding groove bracket 20 and the stop portion 40 shown in FIG. 9 may be adapted to the primary swing arm 10 shown in FIG. 8. In an implementation, the slideway 22 may be disposed on a side surface of the sliding groove bracket 20 facing the primary swing arm 10. Specifically, the side surface of the sliding groove bracket 20 facing the primary swing arm 10 is recessed inward to form the slideway 22. The slideway 22 may include a slideway inner bottom wall 221, an opening end 222 and a slideway end wall 223 that are oppositely arranged in a sliding direction of the protruding portion. The slideway inner bottom wall 221 is located between the opening end 222 and the slideway end wall 223. The protruding portion is configured to move along the slideway inner bottom wall 221 when the sliding portion slides back and forth along the sliding groove 21. The slideway end wall 223 is configured as the first end surface 41 of the stop portion 40. When the primary swing arm 10 rotates from the unfolded position to the closed position, the protruding portion 12 enters the slideway 22 through the opening end 222, and when the primary swing arm 10 rotates to the closed position, the protruding portion 12 abuts against the slideway end wall 223. In this way, the slideway 22 can be better adapted to a moving track of the protruding portion 12, and the protruding portion 12 is stopped at the slideway end wall 223. This is simple and effective in structure and is easy for processing.

In an implementation, as shown in FIG. 9, the stop portion 40 may be disposed on the shaft cover 30. In this way, only after the shaft cover 30 is assembled with the sliding groove bracket 20, the stop portion 40 is fitted with the protruding portion 12 of the primary swing arm 10 and performs a function of preventing disengagement. The primary swing arm 10 and the sliding groove bracket 20 may be first assembled, and then are integrally assembled on the shaft cover 30. The overall structure is skillful, easy for processing and of low costs, and it is convenient to assemble the primary swing arm 10 with the protruding portion 12. It should be noted that, in this implementation, because the stop portion 40 is disposed on the shaft cover 30, and both the stop portion 40 and the sliding groove bracket 20 are separate parts, the slideway end wall 223 of the slideway 22 on the sliding groove bracket 20 is served by the first end surface 41 of the stop portion 40. In other words, when the shaft cover 30 is not assembled with the sliding groove bracket 20, the opening end 222 and the slideway inner bottom wall 221 of the slideway 22 are separated from the slideway end wall 223.

In addition, when the recessed portion is formed in a direction in which the first end surface al of the primary swing arm 10 faces the second end b, the protruding portion 12 is disposed on the recessed portion, and one end of the protruding portion 12 extends out of the surface of the recessed portion, the sliding groove bracket and the stop portion shown in FIG. 9 may also be adapted to each other, and the stop portion 40 disposed on the shaft cover 30 is fitted with the protruding portion 12 to perform anti-disengagement and stopping. It should be noted that, through disposed positions of the protruding portion 12 and the stop portion 40 provided in this embodiment of this application, a person skilled in the art may make adaptive structural adjustments to the slideway 22 on the sliding groove bracket 20 with reference to a specific situation and requirement, and a specific structure should also fall within the protection scope of embodiments of this application.

Refer to FIG. 10 and FIG. 11. One side of the stop portion 40 facing the slideway 22 has the first end surface 41. When the primary swing arm 10 rotates from the unfolded position to the closed position, the protruding portion 12 abuts against the first end surface 41. The stop portion 40 further includes a second end surface 42 connected to the first end surface 41. When the primary swing arm 10 rotates to the unfolded position, a first side surface of the primary swing arm 10 facing the shaft cover 30 abuts against the second end surface 42. In this way, after the primary swing arm 10 rotates from the closed position to the unfolded position, the second end surface 42 of the stop portion 40 may further perform a limiting function on the primary swing arm 10, to prevent the primary swing arm 10 from rotating excessively and damaging other parts. In an implementation, the second end surface 42 of the stop portion 40 may be perpendicular to the first end surface 41 of the stop portion 40. In this way, the primary swing arm 10 may be rotated 90 degrees between the closed position and the unfolded position. This better meets actual use requirements and experience of the user. In another implementation, an included angle greater than 90 degrees may be formed between the second end surface 42 and the first end surface 41, where an opening direction of the included angle faces a bottom surface of the shaft cover 30. Specifically, adjustments may be made based on a situation and experience. This is not specifically limited in embodiments of this application.

In an implementation, an assembly sequence of the rotation mechanism shown in FIG. 10 and FIG. 11 is as follows. The primary swing arm 10 is first mounted on the sliding groove bracket 20, and then the sliding groove bracket 20 and the primary swing arm 10 are integrally mounted on the shaft cover 30. When the primary swing arm 10 is mounted, the sliding portion 11 of the primary swing arm 10 may be aligned with an entrance of the sliding groove 21, and after the protruding portion 12 is aligned with the slideway 22, the sliding portion 11 and the protruding portion 12 correspondingly slide into the sliding groove 21 and the slideway 22 to complete the mounting. After the sliding groove bracket 20 and the primary swing arm 10 are integrally mounted on the shaft cover 30, the stop portion 40 is fitted with the protruding portion 12, to prevent the sliding portion 11 of the primary swing arm 10 from being disengaged from the sliding groove 21. In this way, the sliding groove bracket 20 provided in embodiments of this application is designed as an integral structure and is provided with the slideway 22 adapted to the protruding portion 12, the protruding portion 12 is disposed on the first end surface al of the two opposite ends of the primary swing arm 10 in the length manner, and the stop portion 40 is disposed on the shaft cover 30. Through an adaptive design of the protruding portion 12, the primary swing arm 10 provided with the protruding portion 12 can be ensured to be disposed in the sliding groove bracket 20 of the integral structure, so that the protruding portion 12 is fitted with the stop portion 40 after the primary swing arm 10 is closed. In this way, a total quantity of parts of the rotation mechanism is small. This is convenient to assembly, and a case in which a width of the sliding groove 21 formed on the sliding groove bracket 20 is increased due to an assembly problem can also be avoided, so that a fit clearance between the sliding groove 21 and the primary swing arm