Rotating mechanism and foldable electronic equipment

Abstract

The utility model provides a rotating mechanism and foldable electronic equipment, and the rotating mechanism comprises a damping swing arm which comprises a body and a concave-convex wheel; the body comprises a swinging body and a rotating body, and the swinging body and the rotating body are fixedly connected in the length direction of the damping swing arm; the concave-convex wheel and the rotating body are coaxially and fixedly connected in the width direction of the damping swing arm; the body has a first Rockwell hardness, the concave-convex wheel has a second Rockwell hardness, and the second Rockwell hardness is greater than the first Rockwell hardness. The concave-convex wheel and the body are made of different materials. And the Rockwell hardness of the concave-convex wheel is greater than that of the body, so that the wear resistance of the concave-convex wheel can be enhanced, the concave-convex wheel can bear larger wear force, the damping force in the opening and closing process of the foldable electronic equipment is guaranteed, and the opening and closing hand feeling is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of foldable electronic devices, and in particular to a rotating mechanism and a foldable electronic device. Background Art

[0002] With the development of science and technology, various electronic devices have become indispensable products in daily life and production. Among them, foldable electronic devices have gradually become a development trend due to their large display area and easy portability. The current foldable electronic devices mainly rely on a rotating mechanism to achieve the folding and unfolding functions.

[0003] In current rotating mechanisms, damping swing arms usually integrate damping functions and rotating functions. However, the current damping function structure is prone to wear problems, resulting in a decrease in damping force. Utility Model Content

[0004] The present application provides a rotating mechanism and a foldable electronic device, wherein the damping functional structure has good wear resistance and prevents the damping force from decreasing.

[0005] The first aspect of the present application provides a rotating mechanism, including: a damping swing arm, the damping swing arm includes a main body and a concave cam; the main body includes a swinging body and a rotating body, and the swinging body and the rotating body are fixedly connected along the length direction of the damping swing arm; along the width direction of the damping swing arm, the concave cam and the rotating body are fixedly connected; the main body has a first Rockwell hardness, and the concave cam has a second Rockwell hardness, and the second Rockwell hardness is greater than the first Rockwell hardness.

[0006] In the related art, the main body and the concave cam are integrally formed using the same material. However, since the main body is mainly subjected to greater force when the foldable electronic device switches between the folded state and the unfolded state, and is subjected to greater force when the foldable electronic device falls from a height, and the concave cam is mainly subjected to mutual wear between adjacent parts when the foldable electronic device switches between the unfolded state and the folded state, that is, the concave cam is mainly subjected to wear force. When the main body and the concave cam are integrally formed using the same material, the force requirement of the concave cam cannot be met, resulting in severe wear of the concave cam, which in turn causes a decrease in the damping force during the opening and closing process of the foldable electronic device, resulting in a decrease in the opening and closing feel.

[0007] In the embodiment of the present application, the concave cam and the body are made of different materials. The Rockwell hardness of the concave cam is greater than that of the body, which can enhance the wear resistance of the concave cam, thereby enabling the concave cam to withstand greater wear force, thereby ensuring the damping force during the opening and closing process of the foldable electronic device, and ensuring the opening and closing feel.

[0008] In addition, since the wear resistance requirement of the main body is lower than that of the concave cam, the main body can be made of a material with a Rockwell hardness lower than that of the concave cam.

[0009] In some embodiments, the first Rockwell hardness A1 satisfies the following condition: A1≥a, and the second Rockwell hardness A2 satisfies the following condition: A2<a, wherein 50HRC≥a≥45HRC. For example, the body can be made of G18 steel, and the concave cam can be made of SKD-11 steel.

[0010] In some embodiments, the body has a first yield strength, and the concave cam has a second yield strength, wherein the second yield strength is less than the first yield strength.

[0011] Since the main body is mainly subjected to greater force when the foldable electronic device switches between the folded state and the unfolded state, and is subjected to greater force when the foldable electronic device falls from a height, that is, the main body is mainly subjected to bending stress and falling force. The concave cam is mainly subjected to mutual wear between adjacent parts when the foldable electronic device switches between the unfolded state and the folded state, that is, the concave cam is mainly subjected to wear force. Therefore, the yield strength of the main body and the concave cam is not the same. In this embodiment, the concave cam and the main body are made of different materials, and the yield strength of the main body is greater than the yield strength of the concave cam, so that the main body can withstand a greater falling force and reduce the risk of the main body breaking. The concave cam can be made of a material with a lower yield strength.

[0012] In some embodiments, the concave cam includes a concave-convex portion and a first mounting end facing each other along its axial direction, and the rotating body includes two second mounting ends facing each other along its axial direction; the first mounting end is provided with a first limiting groove, and at least one of the second mounting ends is provided with a first limiting protrusion; or, the second mounting end is provided with a first limiting groove, and at least one of the first mounting ends is provided with a first limiting protrusion; the first limiting protrusion extends into the first limiting groove to limit the movement of the concave cam in the circumferential direction and / or radial direction. In this way, the relative movement of the concave cam and the rotating body in the circumferential direction or radial direction can be limited, and the stability and strength of the connection between the concave cam and the rotating body can be increased.

[0013] In some embodiments, the concave cam and the rotating body have the same circumferential direction; the first limiting protrusion includes two circumferential limiting surfaces facing each other along the circumferential direction, and the first limiting groove includes two circumferential limiting groove surfaces facing each other along the circumferential direction; the two circumferential limiting surfaces are respectively opposite to the two circumferential limiting groove surfaces. Thus, the relative movement of the concave cam and the rotating body along the circumferential direction can be limited, and the stability and strength of the connection between the concave cam and the rotating body can be increased.

[0014] In some embodiments, the first limiting protrusion and the first limiting groove are interference-fitted so that the concave cam and the rotating body are fixedly connected. That is, the circumferential limiting surface and the circumferential limiting groove surface abut against each other, and there is a holding force between the circumferential limiting surface and the circumferential limiting groove surface, thereby fixing the first limiting protrusion in the first limiting groove, further increasing the connection strength between the concave cam and the rotating body.

[0015] In some embodiments, the concave cam and the axial centerline of the rotating body coincide, there are multiple first limiting protrusions, there are multiple first limiting grooves, multiple first limiting protrusions are arranged at intervals around the axial centerline, and multiple first limiting grooves are arranged at intervals around the axial centerline. Therefore, when the rotating body drives the concave cam to rotate around the axial centerline, the forces on various parts of the rotating body and the concave cam are relatively balanced.

[0016] In some embodiments, a second limiting groove is formed between two adjacent first limiting protrusions, and a second limiting protrusion is formed between two adjacent first limiting grooves; the second limiting protrusion extends into the second limiting groove to limit the concave cam from moving in the circumferential direction and / or radial direction. Thus, the connection between the rotating body and the concave cam can be made more reliable.

[0017] In some embodiments, the concave cam and the rotating body have the same radial direction; the first limiting groove has two openings facing each other in the radial direction; the width of the first limiting protrusion gradually increases in the radial direction; the width of the first limiting groove gradually increases to limit the radial movement of the concave cam. Therefore, when the first limiting protrusion extends into the first limiting groove, the narrower end of the first limiting protrusion is located inside the narrower end of the first limiting groove, and the wider end of the first limiting protrusion is located inside the wider end of the first limiting groove, thereby limiting the relative movement of the concave cam and the rotating body in the radial direction.

[0018] In some embodiments, the concave cam and the rotating body have the same radial direction; the first limiting groove includes two radial limiting groove surfaces that are opposite to each other in the radial direction; the first limiting protrusion includes two radial limiting surfaces that are opposite to each other in the radial direction; the two radial limiting surfaces are respectively opposite to the two radial limiting groove surfaces. Thus, the relative movement of the concave cam and the rotating body in the radial direction can be limited, and the stability and strength of the connection between the concave cam and the rotating body can be increased.

[0019] In some embodiments, the concave cam includes a concave-convex portion and a first mounting end facing each other along its axial direction, and the rotating body includes two second mounting ends facing each other along its axial direction; the second mounting end is provided with a third limiting protrusion, and the first mounting end is provided with a third limiting groove; or, the second mounting end is provided with a third limiting groove, and the first mounting end is provided with a third limiting protrusion; the rotating body and the concave cam have the same axial direction, and the third limiting protrusion extends into the third limiting groove to limit the movement of the concave cam along the axial direction. In this way, the relative movement of the concave cam and the rotating body along the axial direction can be limited, and the stability and strength of the connection between the concave cam and the rotating body can be increased.

[0020] In some embodiments, along the axial direction, the width of the third limiting protrusion gradually increases, and the width of the third limiting groove gradually increases.

[0021] In some embodiments, the third limiting protrusion includes two axial limiting surfaces facing away from each other in the axial direction, and the third limiting groove includes two axial limiting groove surfaces facing each other in the axial direction; the two axial limiting surfaces are respectively opposite to the two axial limiting groove surfaces.

[0022] In some embodiments, the concave cam and the rotating body are fixed by welding. Welding is easy to operate, has a simple process, and has a strong structural strength.

[0023] In some embodiments, the concave cam and the rotating body are fixed by bonding. The bonding process is simple and easy to operate.

[0024] In some embodiments, the concave cam includes a first concave cam, which is provided with a first concave-convex portion; the rotating mechanism also includes a first mounting shaft, a first limit member, a first main elastic member and a first sliding member; the first sliding member is provided with a first matching portion; the first limit member is fixed to the first mounting shaft, the first main elastic member and the first sliding member are both slidably connected to the first mounting shaft, and the two ends of the first main elastic member respectively abut the first limit member and the first sliding member; the first concave cam and the rotating body are both rotatably connected to the first mounting shaft; along the axial direction of the first mounting shaft, the first limit member, the first main elastic member, the first sliding member, the first concave cam and the rotating body are arranged in sequence; the first concave-convex portion and the first matching portion match each other; the protrusion of the first concave-convex portion abuts against the protrusion of the first matching portion, and the first main elastic member is in a compressed state; the protrusion of the first concave cam abuts against the concave portion of the first matching portion, and the first main elastic member is in a pre-compression state.

[0025] When the foldable electronic device is in the unfolded state, the rotating mechanism is in the unfolded state, the protrusion of the first concave cam abuts against the concave part of the first matching part, and the first main elastic member is in the pre-compressed state. At this time, the first main elastic member remains in the pre-compressed state to provide the first fixing plate and the first shell with a supporting force to maintain them in the unfolded state.

[0026] When the foldable electronic device switches from the unfolded state to the folded state, the first fixed plate rotates around the bearing base, the first swinging body slides in the first sliding groove of the first fixed plate, the first rotating body and the first concave cam rotate around the first mounting shaft, and during the rotation of the first concave cam, the protrusion of the first concave cam gradually switches to abutment with the protrusion of the first matching part, and the first sliding member gradually moves in the negative direction of the Y axis to compress one end of the first main elastic member, that is, the first main elastic member is in a pre-compressed state to provide damping force for the first fixed plate and the first shell. The damping force makes the foldable electronic device have a better opening and closing feel.

[0027] In some embodiments, the concave cam further comprises a second concave cam, and the second concave cam is provided with a second concave-convex part; the rotating mechanism further comprises a first pushing member and a first driving member, and the first pushing member and the first driving member are fixedly connected; the first pushing member is provided with a second matching part; the second concave cam is rotatably connected to the first mounting shaft, and the first pushing member and the first driving member are both slidably connected to the first mounting shaft; along the axial direction of the first mounting shaft, the first driving member is located between the first main elastic member and the first limit member, the second concave cam is located at an end of the rotating body away from the first concave cam, and the first pushing member is located at a side of the second concave cam away from the rotating body; the second concave-convex part matches with the second matching part; the first main elastic member is in a compressed state, and the protrusion of the second concave-convex part abuts with the protrusion of the second matching part; the first main elastic member is in a pre-compressed state, and the protrusion of the second concave-convex part abuts with the concave part of the second matching part. As a result, the two ends of the first main elastic member are synchronously compressed, and the compression stroke of the first main elastic member is doubled, so the damping force provided by the first main elastic member to the first fixed plate and the first shell is greatly increased.

[0028] In some embodiments, there are two damping swing arms, which are respectively a first damping swing arm and a second damping swing arm, the first damping swing arm includes a first swinging body and a first rotating body, and the second damping swing arm includes a second swinging body and a second rotating body; the outer circumference of the first rotating body is provided with a first driving tooth, and the outer circumference of the second rotating body is provided with a second driving tooth; the rotating mechanism also includes a first mounting shaft and a second mounting shaft, the first mounting shaft and the second mounting shaft are parallel and spaced apart; the first rotating body is rotationally connected to the first mounting shaft, and the second rotating body is rotationally connected to the second mounting shaft; the first driving tooth and the second driving tooth are transmission-connected. When the first shell and the first fixed plate rotate around the bearing base, the first rotating body of the first damping swing arm rotates, and the first driving tooth and the second driving tooth are transmission-connected, so that the first rotating body drives the second rotating body of the second damping swing arm to rotate. The second rotating body drives the second swinging body to slide and rotate, and the second swinging body drives the second fixed plate and the second shell to rotate, so as to realize the synchronous rotation of the first shell and the second shell.

[0029] The second aspect of the present application is a foldable electronic device, comprising a first housing, a second housing, and a rotating mechanism according to any one of the first aspects of the present application; the rotating mechanism is connected between the first housing and the second housing. The foldable electronic device comprises any rotating mechanism described in the first aspect of the present application, and thus the technical effects of the rotating mechanism are also applicable to the foldable electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0031] Figure 1 It is a schematic diagram of the structure of the foldable electronic device provided in an embodiment of the present application in a first state.

[0032] Figure 2 It is a schematic diagram of the structure of the foldable electronic device provided in an embodiment of the present application in the second state.

[0033] Figure 3 yes Figure 2 Schematic diagram of the split structure of the foldable electronic device shown in.

[0034] Figure 4 yes Figure 3 A partial structural schematic diagram of the rotating mechanism of the foldable electronic device is shown in FIG.

[0035] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure.

[0036] Figure 6 yes Figure 5 Schematic diagram of the structure of the damping swing arm in the damping assembly of the rotating mechanism shown in.

[0037] Figure 7 yes Figure 6 Schematic diagram of the split structure of the damping swing arm shown in.

[0038] Figure 8 yes Figure 7 Schematic diagram of the structure of the concave cam of the damping swing arm shown in.

[0039] Fig. 9 yes Figure 7 The structural schematic diagram of the main body of the damping swing arm is shown in .

[0040] Fig.10 yes Figure 6 FIG. 1 is a schematic structural diagram of a first embodiment of cooperation between a rotating body and a concave cam of a damping swing arm.

[0041] Fig.11 yes Figure 6 Schematic diagram of the structure of the second embodiment of the matching between the rotating body and the concave cam of the damping swing arm shown in FIG.

[0042] Fig.12 yes Figure 6 FIG. 1 is a schematic structural diagram of a third embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm.

[0043] Fig.13 yes Figure 6 FIG. 4 is a schematic structural diagram of a fourth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm.

[0044] Fig.14 yes Figure 6 FIG. 5 is a schematic structural diagram of a fifth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm.

[0045] Fig.15 yes Figure 6 Schematic diagram of the structure of the sixth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm shown in FIG.

[0046] Fig.16 yes Figure 6 FIG. 5 is a schematic structural diagram of a seventh embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm.

[0047] Fig.17 yes Fig.16 The structural schematic diagram of the concave cam is shown in .

[0048] Fig.18 yes Figure 6 The figure is a schematic structural diagram of an eighth embodiment of the cooperation between the rotating body and the concave cam of the damping swing arm.

[0049] Fig.19 yes Figure 4 Schematic diagram of the structure of the damping assembly of the rotating mechanism shown in.

[0050] Fig. 20 yes Fig.19 Schematic diagram of the split structure of the damping component shown in.

[0051] Fig.21 It is a partial structural schematic diagram of the rotating mechanism provided in an embodiment of the present application in an expanded state.

[0052] Fig. 22 It is a partial structural schematic diagram of the rotation mechanism provided in an embodiment of the present application switching from an unfolded state to a folded state.

[0053] Fig.23 It is a partial structural schematic diagram of the rotating mechanism provided in an embodiment of the present application in a folded state. DETAILED DESCRIPTION

[0054] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0055] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a foldable electronic device 1000 provided in an embodiment of the present application in a first state, Figure 2 3 is a schematic diagram of the structure of the foldable electronic device 1000 provided in an embodiment of the present application in the second state.

[0056] Figure 1 The foldable electronic device 1000 is shown in a folded state. Figure 2 The foldable electronic device 1000 is shown in an unfolded state. Figure 2The unfolding angle of the foldable electronic device 1000 is 180 degrees. The foldable electronic device 1000 includes, but is not limited to, a cell phone, a notebook computer, a tablet personal computer, a personal digital assistant, a wearable device, or a mobile device. In the embodiment of the present application, the foldable electronic device 1000 is an inner folding mobile phone as an example for explanation. The inner folding mobile phone is a mobile phone in which the display screen 300 is on the inner side after folding.

[0057] It should be noted that the angles illustrated in the embodiments of the present application are allowed to have slight deviations. Figure 2 The unfolding angle of the foldable electronic device 1000 shown is 180 degrees, and the deviation can be ±5 degrees. The angles described below can be understood in the same way.

[0058] For ease of description, the width direction of the foldable electronic device 1000 is defined as the X-axis direction, the length direction of the foldable electronic device 1000 is defined as the Y-axis direction, and the thickness direction of the foldable electronic device 1000 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0059] The foldable electronic device 1000 includes a main body 200 and a display screen 300, and the display screen 300 is installed on the main body 200. The display screen 300 is a flexible screen, and the display screen 300 includes a display surface and a mounting surface, and the display surface and the mounting surface are arranged opposite to each other. The display surface is used to display text, images, videos, etc. The display screen 300 includes a first display part 310, a second display part 320 and a third display part 330. The third display part 330 is located between the first display part 310 and the second display part 320.

[0060] The main body 200 includes a first shell 210, a second shell 220 and a rotating mechanism 100. The first shell 210 is provided with a first receiving groove (not shown), the second shell 220 is provided with a second receiving groove (not shown), and the first receiving groove and the second receiving groove are connected to form a receiving groove. The rotating mechanism 100 is installed in the receiving groove to realize the rotation connection between the first shell 210 and the second shell 220, and the first shell 210 and the second shell 220 can be relatively rotated through the rotating mechanism 100, so that the main body 200 can switch between the folded state and the unfolded state.

[0061] The display screen 300 is mounted on the main body 200, and the mounting surface is fixedly connected to the main body 200. Specifically, the first display portion 310 is mounted on the first housing 210, and the second display portion 320 is mounted on the second housing 220. The rotating mechanism 100 is arranged opposite to the third display portion 330 to achieve the bending of the display screen 300. The width of the third display portion 330 along the X-axis direction can be greater than or equal to the width of the rotating mechanism 100.

[0062] It should be noted that the directional terms such as “top”, “bottom”, “left”, “right”, “front” and “back” used in the embodiment of the present application to describe the foldable electronic device 1000 are mainly based on the foldable electronic device 1000 in the attached Figure 2 and Figure 4 The display orientation in the figure is explained, with the positive direction of the Z axis as "top" and "upper", the negative direction of the Z axis as "bottom" and "lower", the positive direction of the X axis as "right", the negative direction of the X axis as "left", the positive direction of the Y axis as "back", and the negative direction of the Y axis as "front", which does not limit the orientation of the foldable electronic device 1000 in actual application scenarios. In the embodiments of the present application, A and / or B refer to the three schemes of A, B, A and B.

[0063] The rotating mechanism 100 can realize the switching of the main body 200 between the folded state and the unfolded state. Specifically, the rotating mechanism 100 also has a folded state and an unfolded state. When the rotating mechanism 100 is in the folded state, the mobile phone is in the folded state, at which time the first shell 210 and the second shell 220 are stacked along the Z-axis direction, and the first display unit 310 is located on the side of the first shell 210 facing the second shell 220, that is, the first display unit 310 is located on the inner side of the first shell 210; the second display unit 320 is located on the side of the second shell 220 facing the first shell 210, that is, the second display unit 320 is located on the inner side of the second shell 220. When the rotating mechanism 100 is in the unfolded state, the mobile phone is in the unfolded state, at which time the first shell 210 and the second shell 220 are arranged along the X-axis direction.

[0064] Please refer to Figure 3 and Figure 4 , Figure 3 yes Figure 2 The schematic diagram of the split structure of the foldable electronic device 1000 is shown in FIG. Figure 4 yes Figure 3 A partial structural schematic diagram of a rotating mechanism 100 of a foldable electronic device 1000 is shown in FIG. Figure 3 The foldable electronic device 1000 is shown in an unfolded state. Figure 4The rotating mechanism 100 shown in the figure is in an unfolded state. In this embodiment, the rotating mechanism 100 includes a bearing base 400, a first fixing plate 500, a second fixing plate 600 and a damping assembly 110. The first fixing plate 500 and the second fixing plate 600 are located on opposite sides of the bearing base 400 along the X-axis direction. The damping assembly 110 is installed on the bearing base 400, and the damping assembly 110 is connected to the first fixing plate 500 and the second fixing plate 600 respectively. The bearing base 400 includes a shaft cover and a shielding plate. When the mobile phone is in a folded state, the shaft cover is the appearance part of the mobile phone, and the shielding plate is fixed to the shaft cover to shield the components installed on the shaft cover. The shielding plate is also used to support the display screen 300.

[0065] During the rotation of the foldable electronic device 1000, the damping assembly 110 can provide a damping force so that the user can experience a better damping feel, and at the same time, the foldable electronic device 1000 can be suspended at a preset angle, thereby improving the user's experience. The "preset angle" here refers to the angle between the first shell 210 and the second shell 220 when the foldable electronic device 1000 is suspended, that is, the angle between the first fixing plate 500 and the second fixing plate 600. The range of the preset angle is 0 to 180 degrees.

[0066] Specifically, in the rotating mechanism 100, the first fixed plate 500 is fixed to the first shell 210, and the second fixed plate 600 is fixed to the second shell 220. When the first fixed plate 500 and the first shell 210 rotate around the supporting base 400, the damping assembly 110 provides damping force for the first fixed plate 500 and the first shell 210. When the second fixed plate 600 and the second shell 220 rotate around the supporting base 400, the damping assembly 110 provides damping force for the second fixed plate 600 and the second shell 220.

[0067] The number of the damping components 110 may be two, three, four or five, etc. The plurality of damping components 110 are installed on the supporting base 400 in sequence and at intervals along the Y-axis direction.

[0068] Please refer to Figure 5 , Figure 6 and Figure 7 , Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure. Figure 6 yes Figure 5 The structural schematic diagram of the damping swing arm 10 in the damping assembly 110 of the rotating mechanism 100 is shown in FIG. Figure 7 yes Figure 6The schematic diagram of the split structure of the damping swing arm 10 is shown in FIG. The damping assembly 110 includes the damping swing arm 10, and the damping swing arm 10 includes a body 20 and a concave cam 30; the body 20 includes a swing body 21 and a rotating body 22, along the length direction of the damping swing arm 10, the length direction of the damping swing arm 10 is the X-axis direction, and the swing body 21 and the rotating body 22 are fixedly connected; along the width direction of the damping swing arm 10, the width direction of the damping swing arm 10 is the Y-axis direction, and the concave cam 30 and the rotating body 22 are coaxially fixedly connected.

[0069] There are two damping swing arms 10, and the rotating bodies 22 and concave cams 30 of the two damping swing arms 10 are both rotatably mounted on the bearing base 400. The swinging body 21 of one damping swing arm 10 is slidably and rotatably connected to the first fixed plate 500, and the swinging body 21 of the other damping swing arm 10 is slidably and rotatably connected to the second fixed plate 600. Taking the swinging body 21 slidingly and rotatably connected to the first fixed plate 500 as an example, when the first fixed plate 500 and the first shell 210 rotate around the bearing base 400, the swinging body 21 slides relative to the first fixed plate 500 and rotates around the bearing base 400, and the rotating body 22 and the concave cam 30 both rotate. When the concave cam 30 rotates, it will abut against the adjacent parts and cause wear. The swinging body 21 is subjected to a large force when the mobile phone is in a folded state and when the mobile phone falls from a high place.

[0070] In this embodiment, the main body 20 has a first Rockwell hardness, and the concave cam 30 has a second Rockwell hardness, and the second Rockwell hardness is greater than the first Rockwell hardness. Rockwell hardness is an indicator that determines the hardness value by the depth of plastic deformation of the indentation. When testing the actual hardness of a metal material, the test method is to use a diamond cone or a steel ball to press into the metal material being tested under a certain load, and the hardness of the material is calculated from the indentation depth. The shallower the indentation depth, the less likely the material is to be scratched, the greater the Rockwell hardness of the material, and the better the wear resistance of the material. The deeper the indentation depth, the easier the material is to be scratched, the smaller the Rockwell hardness of the material, and the worse the wear resistance of the material.

[0071] Specifically, the body 20 and the concave cam 30 can be processed separately, and then the body 20 and the concave cam 30 are fixed into an integral structure. As a result, the body 20 and the concave cam 30 are made of different materials, wherein the body 20 can be made of a material having a first Rockwell hardness, and the concave cam 30 can be made of a material having a second Rockwell hardness. Exemplarily, the body 20 can be made of G18 steel, and the concave cam 30 can be made of SKD-11 steel.

[0072] In the related art, the main body 20 and the concave cam 30 are integrally formed using the same material. However, the main body 20 is mainly subjected to greater force when the mobile phone switches between the folded state and the unfolded state, and is also subjected to greater force when the mobile phone falls from a height. The concave cam 30 is mainly subjected to mutual wear with adjacent parts when the mobile phone switches between the unfolded state and the folded state, that is, the concave cam 30 is mainly subjected to wear force. When the main body 20 and the concave cam 30 are integrally formed using the same material, currently only the force requirement of the main body 20 can be met, and the force requirement of the concave cam 30 cannot be met, resulting in severe wear of the concave cam 30, which in turn will cause the damping force to decrease during the opening and closing process of the foldable electronic device 1000, resulting in a decrease in the opening and closing feel.

[0073] In the embodiment of the present application, the concave cam 30 and the body 20 are made of different materials. The Rockwell hardness of the concave cam 30 is greater than the Rockwell hardness of the body 20, which can enhance the wear resistance of the concave cam 30, thereby enabling the concave cam 30 to withstand greater wear force, thereby ensuring the damping force during the opening and closing process of the foldable electronic device 1000, and ensuring the opening and closing feel.

[0074] In addition, since the wear resistance requirement of the body 20 is lower than that of the concave cam 30 , the body 20 is made of a material having a lower Rockwell hardness than that of the concave cam 30 .

[0075] In some embodiments, the first Rockwell hardness A1 satisfies the following condition: A1≥a, and the second Rockwell hardness A2 satisfies the following condition: A2<a, wherein 50HRC≥a≥45HRC. Specifically, a can be 45HRC, 46HRC, 47HRC, 48HRC, 50HRC, 53HRC, 56HRC, 65HRC, 70HRC, 75HRC, 77HRC, 80HRC, 90HRC or 100HRC, etc., which is not limited in this application.

[0076] In some embodiments, the body 20 has a first yield strength, and the concave cam 30 has a second yield strength, and the second yield strength is less than the first yield strength. The yield strength is the yield limit of the metal material when the yield phenomenon occurs, that is, the stress when the metal material resists a slight plastic deformation. If the metal material is subjected to an external force greater than the yield strength, the metal material will produce permanent and irreversible deformation.

[0077] Since the main body 20 is mainly subjected to greater force when the foldable electronic device 1000 switches between the folded state and the unfolded state, and is subjected to greater force when the foldable electronic device 1000 falls from a height, that is, the main body 20 is mainly subjected to bending stress and falling force. The concave cam 30 is mainly subjected to mutual wear between adjacent parts when the foldable electronic device 1000 switches between the unfolded state and the folded state, that is, the concave cam 30 is mainly subjected to wear force. Therefore, the yield strength of the main body 20 and the concave cam 30 is not the same. In this embodiment, the concave cam 30 and the main body 20 are made of different materials, and the yield strength of the main body 20 is greater than the yield strength of the concave cam 30, so that the main body 20 can withstand a greater falling force and reduce the risk of the main body breaking. The concave cam 30 can be made of a material with a lower yield strength.

[0078] In other embodiments, the first yield strength may be set to be greater than or equal to the second yield strength, as long as the force requirements of the body 20 and the concave cam 30 are met.

[0079] In some embodiments, the body 20 and the concave cam 30 may be fixedly connected by bonding or welding.

[0080] For details, please refer to Figure 8 , Figure 8 yes Figure 7 The structural schematic diagram of the concave cam 30 of the damping swing arm 10 is shown in FIG. The concave cam 30 is provided with a through hole 31, and the concave cam 30 includes a first inner wall surface 32, a first outer wall surface 33, a first mounting end 34 and a concave-convex portion 35. Along the Y-axis direction, the through hole 31 passes through the concave cam 30, the first inner wall surface 32 is the hole wall surface of the through hole 31, the first outer wall surface 33 is opposite to the first inner wall surface 32, the first mounting end 34 and the concave-convex portion 35 are located at two opposite ends of the concave cam 30 along the Y-axis direction, and the two sides of the first mounting end 34 are respectively connected to one side of the first inner wall surface 32 and the first outer wall surface 33, and the two sides of the concave-convex portion 35 are respectively connected to the other side of the first inner wall surface 32 and the first outer wall surface 33. The concave-convex portion 35 includes a plurality of protrusions and a plurality of concave portions, and the plurality of protrusions and the plurality of concave portions are alternately arranged around the axial center line of the concave cam 30.

[0081] Please refer to Fig. 9 , Fig. 9 yes Figure 7The structural schematic diagram of the main body 20 of the damping swing arm 10 is shown in the figure. The rotating body 22 is provided with a rotating hole 23, and the rotating body 22 includes a second inner wall surface 24, a second outer wall surface 25 and two second mounting ends 26. Along the Y-axis direction, the rotating hole 23 passes through the rotating body 22, the second inner wall surface 24 is the hole wall surface of the rotating hole 23, the second outer wall surface 25 is opposite to the first inner wall surface 32, and the two second mounting ends 26 are located at two opposite ends of the rotating body 22 along the Y-axis direction, and the two sides of one of the second mounting ends 26 are respectively connected to one side of the second inner wall surface 24 and the second outer wall surface 25, and the two sides of the other second mounting end 26 are respectively connected to the other side of the second inner wall surface 24 and the second outer wall surface 25.

[0082] The body 20 and the concave cam 30 are fixedly connected, specifically, the first mounting end 34 of the concave cam 30 and the second mounting end 26 of the rotating body 22 are fixedly connected by bonding or welding. That is, the opposite ends of the rotating body 22 are connected with the concave cam 30. After the body 20 and the concave cam 30 are fixedly connected, the rotating body 22 and the concave cam 30 are coaxial, and the radial directions of the rotating body 22 and the concave cam 30 are the same, and the circumferential directions of the rotating body 22 and the concave cam 30 are also the same. The through hole 31 and the rotating hole 23 are opposite and connected, and the through hole 31 and the rotating hole 23 are coaxial.

[0083] For some examples, please refer to Fig.10 , Fig.10 yes Figure 6 The structure schematic diagram of the first embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown in the figure. A limiting structure can also be set between the main body 20 and the concave cam 30, and the limiting structure can be a structure in which a limiting protrusion and a limiting groove cooperate. Specifically, the second mounting end 26 of the rotating body 22 is provided with a first limiting groove 27, and the first mounting end 34 of the concave cam 30 is provided with a first limiting protrusion 36. Among them, the first limiting protrusion 36 is convexly arranged on the first mounting end 34 of the concave cam 30, and the first limiting groove 27 is concavely arranged on the second mounting end 26 of the rotating body 22. The first limiting protrusion 36 extends into the first limiting groove 27 to limit the concave cam 30 from moving in the circumferential direction and / or radial direction.

[0084] Several schemes of cooperating between the first limiting protrusion 36 and the first limiting groove 27 to limit the circumferential and / or radial movement of the concave cam 30 are described in detail below.

[0085] In the first specific implementation, please refer to Fig.10The first limiting protrusion 36 may be a rectangular protrusion, the first limiting groove 27 may be a rectangular groove, and the first limiting groove 27 has two openings opposite to each other along the radial direction of the concave cam 30. The first limiting protrusion 36 may include two circumferential limiting surfaces 361 opposite to each other along the circumference of the concave cam 30, and the first limiting groove 27 may include two circumferential limiting groove surfaces 271 opposite to each other along the circumference of the rotating body 22, and the two circumferential limiting surfaces 361 are respectively opposite to the two circumferential limiting groove surfaces 271. In this way, the relative movement of the concave cam 30 and the rotating body 22 along the circumferential direction can be limited, and the stability and strength of the connection between the concave cam 30 and the rotating body 22 can be increased.

[0086] The circumferential limiting surface 361 and the circumferential limiting groove surface 271 may be clearance-fitted or transition-fitted to increase the convenience of installing the first limiting protrusion 36 in the first limiting groove 27 .

[0087] The circumferential limiting surface 361 and the circumferential limiting groove surface 271 may also be interference fit to fix the concave cam 30 and the rotating body 22. That is, the circumferential limiting surface 361 and the circumferential limiting groove surface 271 abut against each other, and there is a holding force between the circumferential limiting surface 361 and the circumferential limiting groove surface 271, thereby fixing the first limiting protrusion 36 in the first limiting groove 27 to limit the relative movement of the concave cam 30 and the rotating body 22 in the circumferential, radial and axial directions, and further increasing the connection strength between the concave cam 30 and the rotating body 22.

[0088] Specifically, when the first limiting protrusion 36 is installed in the first limiting groove 27, the first limiting protrusion 36 and the first limiting groove 27 can be interfered by the principle of thermal expansion and contraction. In detail, the concave cam 30 and the rotating body 22 can be placed in a cooling device such as a refrigerator for cooling. After the concave cam 30 is cooled, the first limiting protrusion 36 shrinks, and the distance between the two circumferential limiting surfaces 361 decreases. After the rotating body 22 is cooled, the distance between the two circumferential limiting groove surfaces 271 increases. At this time, the first limiting protrusion 36 can easily extend into the first limiting groove 27. Then, the concave cam 30 and the rotating body 22 are heated again, and the first limiting protrusion 36 expands after being heated, and the distance between the two circumferential limiting surfaces 361 increases, and the distance between the two circumferential limiting groove surfaces 271 increases, so that the circumferential limiting surface 361 abuts against the circumferential limiting groove surface 271.

[0089] In the second specific implementation, please refer to Fig.11 , Fig.11 yes Figure 6The structural schematic diagram of the second embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown in the figure. The first limiting protrusion 36 can be an arc-shaped protrusion, and the extension direction of the arc-shaped protrusion is the same as the circumference of the concave cam 30. The first limiting groove 27 can be an arc-shaped groove, and the extension direction of the arc-shaped groove is the same as the circumference of the rotating body 22. The first limiting protrusion 36 can include two radial limiting surfaces 362 opposite to each other in the radial direction of the concave cam 30, and the first limiting groove 27 can include two radial limiting groove surfaces 272 opposite to each other in the radial direction of the rotating body 22. The two radial limiting surfaces 362 are respectively opposite to the two radial limiting groove surfaces 272. There can be a small gap between the radial limiting surface 362 and the radial limiting side surface, or they can be in direct contact. In this way, the relative movement of the concave cam 30 and the rotating body 22 in the radial direction can be limited, and the stability and strength of the connection between the concave cam 30 and the rotating body 22 can be increased.

[0090] The radial limiting surface 362 and the radial limiting groove surface 272 may be clearance-fitted or transition-fitted, so as to increase the convenience of installing the first limiting protrusion 36 in the first limiting groove 27 .

[0091] The radial limiting surface 362 and the radial limiting groove surface 272 may also be an interference fit, so that the concave cam 30 and the rotating body 22 are fixedly connected. That is, the radial limiting surface 362 and the radial limiting groove surface 272 abut against each other, and there is a holding force between the radial limiting surface 362 and the radial limiting groove surface 272, thereby making the first limiting protrusion 36 fixed in the first limiting groove 27, so as to limit the relative movement of the concave cam 30 and the rotating body 22 in the circumferential, radial and axial directions, and further increase the connection strength between the concave cam 30 and the rotating body 22.

[0092] The implementation method of the interference fit between the radial limiting surface 362 and the radial limiting groove surface 272 is similar to the interference fit between the circumferential limiting surface 361 and the circumferential limiting groove surface 271 , which will not be described in detail.

[0093] In the third specific implementation, please refer to Fig.12 , Fig.12 yes Figure 6The structural schematic diagram of the third embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown in the figure. The first limiting protrusion 36 can be a rectangular protrusion, and the first limiting groove 27 can be a rectangular groove. The first limiting protrusion 36 includes two circumferential limiting surfaces 361 opposite to each other along the circumference of the concave cam 30, and two radial limiting surfaces 362 opposite to each other along the radial direction of the concave cam 30. The first limiting groove 27 includes two circumferential limiting groove surfaces 271 opposite to each other along the circumference of the rotating body 22, and two radial limiting groove surfaces 272 opposite to each other along the radial direction of the rotating body 22. The two circumferential limiting surfaces 361 are respectively opposite to the two circumferential limiting groove surfaces 271 to limit the relative rotation of the concave cam 30 and the rotating body 22 in the circumferential direction. The two radial limiting surfaces 362 are respectively opposite to the two radial limiting groove surfaces 272 to limit the relative movement of the concave cam 30 and the rotating body 22 in the radial direction.

[0094] The circumferential limiting surface 361 and the circumferential limiting groove surface 271 may be clearance-fitted or transition-fitted, and the radial limiting surface 362 and the radial limiting groove surface 272 may be clearance-fitted or transition-fitted, so as to increase the convenience of installing the first limiting protrusion 36 in the first limiting groove 27. The circumferential limiting surface 361 and the circumferential limiting groove surface 271 may also be interference-fitted, and the radial limiting surface 362 and the radial limiting groove surface 272 may also be interference-fitted, and there is a holding force between the circumferential limiting surface 361 and the circumferential limiting side surface, and there is also a holding force between the radial limiting surface 362 and the radial limiting side surface, so as to make the concave cam 30 and the rotating body 22 more firmly connected.

[0095] In other embodiments, the second mounting end 26 of the rotating body 22 is provided with a first limiting protrusion 36, and the first mounting end 34 of the concave cam 30 is provided with a first limiting groove 27. The first limiting groove 27 is concavely provided at the first mounting end 34 of the concave cam 30, and the first limiting protrusion 36 is convexly provided at the second mounting end 26 of the rotating body 22. The manner in which the first limiting protrusion 36 and the first limiting groove 27 cooperate with each other is the same as in the above embodiment, and will not be described in detail.

[0096] For some examples, please refer to Fig.13 , Fig.13 yes Figure 6 The structure diagram of the fourth embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown in the figure. There are multiple first limiting protrusions 36, and there are multiple first limiting grooves 27. Multiple first limiting protrusions 36 are arranged at intervals around the axial center line, and multiple first limiting grooves 27 are arranged at intervals around the axial center line. Here, multiple means more than two, for example: two, three, four, five or six, etc. As a result, when the swing body 21 drives the rotating body 22 to rotate around the axial center line, and the rotating body 22 then drives the concave cam 30 to rotate around the axial center line, the forces on various parts of the rotating body 22 and the concave cam 30 are relatively balanced.

[0097] In addition, when a plurality of first limiting protrusions 36 and first limiting grooves 27 are provided, a second limiting groove 37 is formed between two adjacent first limiting protrusions 36, and a second limiting protrusion 28 is formed between two adjacent first limiting grooves 27; the second limiting protrusion 28 extends into the second limiting groove 37 to limit the cam 30 from moving in the circumferential direction and / or radial direction. The structure and matching method of the second limiting protrusion 28 and the second limiting groove 37 refer to the first limiting protrusion 36 and the first limiting groove, and will not be described in detail. In this way, the connection between the rotating body 22 and the concave cam 30 can be made more reliable.

[0098] In addition, when a plurality of first limiting protrusions 36 and first limiting grooves 27 are provided, even if the first limiting protrusions 36 and the first limiting grooves 27 only have the circumferential limiting surface 361 and the circumferential limiting groove surface 271 to cooperate, the radial limiting of the concave cam 30 and the rotating body 22 can also be achieved by changing the width dimensions of the first limiting protrusions 36 and the first limiting grooves 27.

[0099] Several schemes of cooperating with each other in a plurality of first limiting protrusions 36 and a plurality of first limiting grooves 27 to limit the circumferential and / or radial movement of the concave cam 30 are described in detail below.

[0100] In the fourth specific implementation, please refer to Fig.13 In order to more clearly show the distribution of the first limiting protrusion 36 and the first limiting groove 27, Fig.13 The angle of the concave cam 30 is different from that of the main body 200. Similar situations appearing in the following figures are explained in the same way. The first mounting end 34 of the concave cam 30 is provided with three first limiting protrusions 36, which are arranged at intervals around the axial center line of the concave cam 30, and a second limiting groove 37 is formed between any two adjacent first limiting protrusions 36. The second mounting end 26 of the rotating body 22 is provided with three first limiting grooves 27, which are arranged at intervals around the axial center line of the rotating body 22, and a second limiting protrusion 28 is formed between any two adjacent first limiting grooves 27.

[0101] The first limiting protrusion 36 includes two circumferential limiting surfaces 361 opposite to each other along the circumference of the concave cam 30, and the first limiting groove 27 includes two circumferential limiting groove surfaces 271 opposite to each other along the circumference of the rotating body 22. The two circumferential limiting surfaces 361 are respectively opposite to the two circumferential limiting groove surfaces 271 to limit the relative rotation of the concave cam 30 and the rotating body 22 along the circumferential direction.

[0102] Moreover, along the radial direction of the concave cam 30, the width of the first limiting protrusion 36 gradually increases, and the width direction of the first limiting protrusion 36 is roughly parallel to the circumference of the concave cam 30, that is, the first limiting protrusion 36 is fan-shaped. Specifically, the width of the first limiting protrusion 36 gradually increases from the first inner wall surface 32 to the direction of the first outer wall surface 33. The first limiting groove 27 has two openings opposite to each other in the radial direction. Along the radial direction of the rotating body 22, the width of the first limiting groove 27 gradually increases, and the width direction of the first limiting groove 27 is roughly parallel to the circumference of the rotating body 22, that is, the first limiting groove 27 is fan-shaped. Therefore, when the first limiting protrusion 36 extends into the first limiting groove 27, the narrower end of the first limiting protrusion 36 is located in the narrower end of the first limiting groove 27, and the wider end of the first limiting protrusion 36 is located in the wider end of the first limiting groove 27, thereby limiting the relative movement of the concave cam 30 and the rotating body 22 in the radial direction.

[0103] The structures and matching methods of the second limiting protrusion 28 and the second limiting groove 37 refer to the first limiting protrusion 36 and the first limiting groove, and are not described in detail again.

[0104] In the fifth specific implementation, please refer to Fig.14 , Fig.14 yes Figure 6 , a schematic structural diagram of a fifth embodiment of the cooperation between the rotating body 22 of the damping swing arm 10 and the concave cam 30 is shown in FIG. The first mounting end 34 of the concave cam 30 is provided with six first limiting protrusions 36, and the six first limiting protrusions 36 are arranged at intervals around the axial center line of the concave cam 30, and a second limiting groove 37 is formed between any two adjacent first limiting protrusions 36. Three of the six first limiting protrusions 36 are fan-shaped protrusions 36A, and the other three are rectangular protrusions 36B. The fan-shaped protrusions 36A and the rectangular protrusions 36B are arranged alternately along the circumference of the concave cam 30.

[0105] The second mounting end 26 of the rotating body 22 is provided with six first limiting grooves 27, and the six first limiting grooves 27 are arranged at intervals around the axial center line of the rotating body 22, and a second limiting protrusion 28 is formed between any two adjacent first limiting grooves 27. Three of the six first limiting grooves 27 are fan-shaped grooves 27A, and the other three are rectangular grooves 27B. The fan-shaped grooves 27A and the rectangular grooves 27B are alternately arranged along the circumference of the rotating body 22.

[0106] The fan-shaped protrusion 36A and the fan-shaped groove 27A have the same structure and matching mode as those in the first embodiment, and will not be described in detail. The fan-shaped protrusion 36A and the fan-shaped groove 27A cooperate to limit the relative movement of the concave cam 30 and the rotating body 22 in the circumferential and radial directions, thereby increasing the stability of the connection between the concave cam 30 and the rotating body 22.

[0107] In this embodiment, the rectangular protrusion 36B and the rectangular groove 27B have the same structure and matching mode as the rectangular protrusion 36B and the rectangular groove 27B in the third embodiment of the above-mentioned embodiment, and will not be described in detail. The rectangular protrusion 36B and the rectangular groove 27B cooperate to limit the relative movement of the concave cam 30 and the rotating body 22 in the circumferential and radial directions, further increasing the stability of the connection between the concave cam 30 and the rotating body 22.

[0108] Furthermore, the six first limiting protrusions 36 cooperate with the six first limiting grooves 27 so that the forces on the concave cam 30 and various parts of the rotating body 22 are more balanced.

[0109] In the sixth implementation, please refer to Fig.15 , Fig.15 yes Figure 6 , a sixth embodiment of the structure of the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown in FIG. The first mounting end 34 of the concave cam 30 is provided with six first limiting grooves 27, and the six first limiting grooves 27 are arranged at intervals around the axial center line of the concave cam 30. The six first limiting protrusions 36 are all fan-shaped protrusions 36A, wherein one side surface 383 of three fan-shaped protrusions 36A is flush with the second outer wall surface 25, and one side surface 383 of the other three fan-shaped protrusions 36A is flush with the second inner wall surface 24.

[0110] The second mounting end 26 of the rotating body 22 is provided with six first limiting protrusions 36, and the six first limiting protrusions 36 are arranged at intervals around the axial center line of the rotating body 22. The six first limiting grooves 27 are all fan-shaped grooves 27A, of which three fan-shaped grooves 27A have openings that penetrate the first inner wall surface 32, and the other three fan-shaped grooves 27A have openings that penetrate the first outer wall surface 33.

[0111] The two types of fan-shaped protrusions 36A are alternately arranged along the circumference of the concave cam 30 , and the two types of fan-shaped grooves 27A are alternately arranged along the circumference of the rotating body 22 , so that the force is more uniform after the concave cam 30 and the rotating body 22 are connected.

[0112] For some examples, please refer to Fig.16 , Fig.16 yes Figure 6 , a seventh embodiment of the structure of the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown in FIG. The second mounting end 26 of the rotating body 22 is provided with a third limiting groove 29, and the first mounting end 34 of the concave cam 30 is provided with a third limiting protrusion 38. The third limiting protrusion 38 extends into the third limiting groove 29 to limit the axial movement of the concave cam 30. Specifically, the third limiting protrusion 38 is convexly provided on the first mounting end 34 of the concave cam 30, and the third limiting groove 29 is concavely provided on the second mounting end 26 of the rotating body 22.

[0113] Several schemes for the third limiting protrusion 38 and the third limiting groove 29 to cooperate with each other to limit the relative movement of the concave cam 30 and the rotating body 22 along the axial direction are described in detail below.

[0114] In the seventh specific implementation, please refer to Fig.16 and Fig.17 , Fig.17 yes Fig.16 The structural schematic diagram of the concave cam 30 is shown in . The third limiting protrusion 38 is an arc-shaped protrusion, and the extension direction of the third limiting protrusion 38 is the same as the circumferential direction of the concave cam 30. Along the axial direction of the concave cam 30, the width of the third limiting protrusion 38 gradually increases. Specifically, the third limiting protrusion 38 includes a top surface 381, a bottom surface 382 and two side surfaces 383, the bottom surface 382 is fixedly connected to the first mounting end 34 of the concave cam 30, the bottom surface 382 is opposite to the top surface 381, and the two side surfaces 383 are connected between the top surface 381 and the bottom surface 382. The width of the top surface 381 is greater than the width of the bottom surface 382, ​​and the two side surfaces 383 are inclined relative to the axial direction of the concave cam 30. That is, the cross-section of the third limiting protrusion 38 along the axial direction of the concave cam 30 is trapezoidal.

[0115] The third limiting groove 29 is an arc-shaped groove, and the extension direction of the third limiting groove 29 is the same as the circumferential direction of the rotating body 22. Along the axial direction of the rotating body 22, the width of the third limiting groove 29 gradually increases. Specifically, the third limiting groove 29 includes a groove bottom surface, two groove side surfaces and a notch. Along the axial direction of the rotating body 22, the groove bottom surface and the notch are opposite. The two groove side surfaces are respectively connected to the groove bottom surface. The width of the notch of the third limiting groove 29 is greater than the width of the groove bottom surface, and the two groove side surfaces are inclined relative to the axial direction of the rotating body 22. That is, the cross-section of the third limiting groove 29 along the axial direction of the rotating body 22 is trapezoidal.

[0116] When assembling the concave cam 30 and the rotating body 22, firstly, the first mounting end 34 of the concave cam 30 and the second mounting end 26 of the rotating body 22 are brought into contact with each other, and the concave cam 30 and the rotating body 22 are made coaxial, and then the concave cam 30 is rotated along the circumferential direction of the concave cam 30 so that the third limiting protrusion 38 extends into the third limiting groove 29. In this way, the relative movement of the concave cam 30 and the rotating body 22 along the axial direction can be limited.

[0117] In the embodiment of the present application, the three third limiting protrusions 38 are respectively connected to the three first limiting protrusions 36. When the concave cam 30 and the rotating body 22 are assembled, the three first limiting protrusions 36 are firstly extended into the three first limiting grooves 27 respectively, and then the concave cam 30 is rotated in the circumferential direction so that the three third limiting protrusions 38 are respectively extended into the three third limiting grooves 29. At this time, the first limiting protrusion 36 still maintains the matching state with the first limiting groove 27. The matching mode of the first limiting protrusion 36 and the first limiting groove 27 is referred to the above embodiment and will not be repeated.

[0118] In the eighth specific implementation, please refer to Fig.18 , Fig.18 yes Figure 6 , a schematic structural diagram of an eighth embodiment of the cooperation between the rotating body 22 and the concave cam 30 of the damping swing arm 10 is shown. The concave cam 30 is provided with three third limiting protrusions 38, and the three third limiting protrusions 38 are respectively connected to the three first limiting protrusions 36, and there is a gap between the third limiting protrusions 38 and the first mounting end 34. The third limiting protrusion 38 includes two axial limiting surfaces 384 facing each other in the axial direction, and one of the axial limiting surfaces 384 faces the first mounting end 34.

[0119] The rotating body 22 is provided with three third limiting grooves 29, which are respectively recessed on the sides of the three second limiting protrusions 28. And the third limiting groove 29 includes two axial limiting groove surfaces (not shown) opposite to each other in the axial direction. It can be understood that the notch of the third limiting groove 29 in the first specific embodiment above and the second mounting end 26 is closed by the axial limiting groove surface, and the axial limiting groove surface is opposite to the groove bottom surface of the third limiting groove 29.

[0120] When assembling the concave cam 30 and the rotating body 22, firstly, the three first limiting protrusions 36 are respectively extended into the three first limiting grooves 27, and then the concave cam 30 is rotated in the circumferential direction so that the three third limiting protrusions 38 are respectively extended into the three third limiting grooves 29. At this time, the first limiting protrusion 36 still maintains the matching state with the first limiting groove 27. The matching mode of the first limiting protrusion 36 and the first limiting groove 27 refers to the above embodiment and will not be repeated. The two axial limiting surfaces 384 are respectively opposite to the two axial limiting groove surfaces, and the axial limiting surface 384 and the axial limiting groove surface can be clearance fit, transition fit or interference fit. In this way, the relative movement of the concave cam 30 and the rotating body 22 in the axial direction can be limited.

[0121] For some examples, please refer to Fig.19 and Fig. 20 , Fig.19 yes Figure 4 The structural diagram of the damping assembly 110 of the rotating mechanism 100 is shown in FIG. Fig. 20 yes Fig.19The schematic diagram of the split structure of the damping assembly 110 is shown in the figure. It has been mentioned above that the damping assembly 110 includes the damping swing arm 10. In fact, the damping assembly 110 also includes a mounting shaft 40, a stopper 50, a main elastic member 60, a sliding member 70, a pushing member 80, a driving member 90, an auxiliary elastic member 63 and a connecting shaft 64. The main elastic member 60 and the auxiliary elastic member 63 can both be springs or rubber members. There are two mounting shafts 40, stopper 50, main elastic member 60, sliding member 70, pushing member 80 and driving member 90. The two mounting shafts 40 are respectively the first mounting shaft 41 and the second mounting shaft 42. The two stoppers 50 are respectively the first stopper 51 and the second stopper 52, and the two main elastic members 60 are respectively the first main elastic member 61 and the second main elastic member 62. The two sliding members 70 are respectively the first sliding member 71 and the second sliding member 72, and the first sliding member 71 and the second sliding member 72 are fixedly connected by the first connecting member 73. The two pushing members 80 are respectively a first pushing member 81 and a second pushing member 82, and the first pushing member 81 and the second pushing member 82 are fixedly connected via a second connecting member 83. There are two driving members 90, and the two driving members 90 are respectively a first driving member 91 and a second driving member 92, and the first driving member 91 and the second driving member 92 are fixedly connected via a third connecting member 93, and the third connecting member 93 and the second connecting member 83 are fixedly connected via a fourth connecting member (not shown).

[0122] There are two damping swing arms 10, and the two damping swing arms 10 are respectively a first damping swing arm 10A and a second damping swing arm 10B. The body 20 of the first damping swing arm 10A is a first body 20A, the swinging body 21 of the first damping swing arm 10A is a first swinging body 21A, and the rotating body 22 of the first damping swing arm 10A is a first rotating body 22A. There are two concave cams 30 of the first damping swing arm 10A, and the two concave cams 30 are respectively a first concave cam 30A and a second concave cam 30B. The body 20 of the second damping swing arm 10B is a second body 20B, the swinging body 21 of the second damping swing arm 10B is a second swinging body 21B, and the rotating body 22 of the second damping swing arm 10B is a second rotating body 22B. There are two concave cams 30 of the second damping swing arm 10B, and the two concave cams 30 are respectively a third concave cam 30C and a fourth concave cam 30D.

[0123] The first concave-convex part is provided in the first concave-convex part, the second concave-convex part is provided in the second concave-convex part, the third concave-convex part is provided in the third concave-convex part, and the fourth concave-convex part is provided in the fourth concave-convex part. The first sliding member 71 is provided with a first matching part 221, the first pushing member 81 is provided with a second matching part, the second sliding member 72 is provided with a third matching part, and the second pushing member 82 is provided with a fourth matching part. The first to fourth concave-convex parts and the first matching parts 221 to the fourth matching parts all include alternately arranged concave parts and convex parts.

[0124] The first damping swing arm 10A, the first mounting shaft 41 , the first position-limiting member 51 , the first main elastic member 61 , and the first sliding member 71 cooperate with each other to provide damping force to the first fixing plate 500 and the first housing 210 .

[0125] For details, please refer to Fig.21 , Fig.21 1 is a partial structural schematic diagram of the rotating mechanism 100 provided in the embodiment of the present application in the unfolded state. The first fixed plate 500 (not shown) is provided with a first slide groove (not shown), and the shaft cover is provided with a mounting groove (not shown). The first swinging body 21A of the first damping swing arm 10A is slidably connected in the first slide groove of the first fixed plate 500, and the first mounting shaft 41 is fixed in the mounting groove of the shaft cover. The axial direction of the first mounting shaft 41 is parallel to the Y-axis direction.

[0126] The first stopper 51 is fixed to the first mounting shaft 41, the first main elastic member 61 and the first sliding member 71 are both slidably connected to the first mounting shaft 41, and the two ends of the first main elastic member 61 abut against the first stopper 51 and the first sliding member 71 respectively; the first concave cam 30A and the first rotating body 22A are both rotatably connected to the first mounting shaft 41. Along the axial direction of the first mounting shaft 41, the first stopper 51, the first main elastic member 61, the first sliding member 71, the first concave cam 30A and the first rotating body 22A are arranged in sequence. The first concave-convex portion and the first matching portion 221 match.

[0127] It can be understood that the first limit member 51 can be a retaining spring, which is fixedly connected to the first limit member 51. The first main elastic member 61 can be a spring, which is slidably sleeved on the first mounting shaft 41. The first sliding member 71 is provided with a through hole that penetrates along the Y-axis direction. The first mounting shaft 41 passes through the through hole of the first sliding member 71, the through hole 31 of the first concave cam 30A, and the rotating hole 23 of the rotating body 22, so that the first sliding member 71 is slidably connected to the first mounting shaft 41, and the first concave cam 30A and the rotating body 22 are both rotatably connected to the first mounting shaft 41.

[0128] When the foldable electronic device 1000 is in the unfolded state, the rotating mechanism 100 is in the unfolded state, the protrusion of the first concave-convex part of the first concave cam 30A abuts against the concave part of the first matching part 221, and the first main elastic member 61 is in the pre-compression state. At this time, the first main elastic member 61 remains in the pre-compression state to provide the first fixing plate 500 and the first housing 210 with a supporting force to maintain them in the unfolded state.

[0129] When the foldable electronic device 1000 switches from the unfolded state to the folded state, please refer to Fig. 22 , Fig. 22It is a partial structural schematic diagram of the rotation mechanism 100 provided in the embodiment of the present application switching from the unfolded state to the folded state. The first fixed plate 500 rotates around the bearing base 400, the first swinging body 21A slides in the first slide groove of the first fixed plate 500, the first rotating body 22A and the first concave cam 30A rotate around the first mounting shaft 41, and during the rotation of the first concave cam 30A, the convexity of the first concave-convex part of the first concave cam 30A gradually switches to abutment with the convexity of the first matching part 221, and the first sliding member 71 gradually moves toward the negative direction of the Y axis to compress one end of the first main elastic member 61, that is, the first main elastic member 61 is in a pre-compressed state to provide damping force for the first fixed plate 500 and the first shell 210.

[0130] When the foldable electronic device 1000 is in the folded state, please refer to Fig.23 , Fig.23 1 is a partial structural schematic diagram of the rotating mechanism 100 provided in the embodiment of the present application in a folded state. The rotating mechanism 100 is in a folded state, the protrusion of the first concave-convex portion of the first concave cam 30A abuts against the concave portion of the first matching portion 221, and the first main elastic member 61 returns to a pre-compressed state to provide a supporting force to keep the first fixing plate 500 and the first housing 210 in the folded state.

[0131] As can be seen from the above, during the movement of the first concave cam 30A, it is mainly in contact with the first matching portion and wears. If the wear of the first concave-convex portion of the first concave cam 30A is relatively serious, the movement stroke of the first sliding member 71 along the negative direction of the Y axis will be too short, which will in turn cause the compression stroke of the first main elastic member 61 to be shorter, and accordingly, the damping force provided by the first main elastic member 61 will decrease.

[0132] In the embodiment of the present application, the first concave cam 30A is provided with good wear resistance, so that the degree of wear when the first concave-convex portion of the first concave cam 30A cooperates with the first matching portion 221 can be reduced, thereby allowing the first sliding member 71 to move a sufficient distance along the negative direction of the Y-axis to ensure the compression stroke of the first main elastic member 61. Correspondingly, the damping force provided by the first main elastic member 61 is guaranteed, thereby ensuring the opening and closing feel of the foldable electronic device 1000.

[0133] For some examples, please refer to Fig.21 , Fig. 22 and Fig.23 The second concave cam 30B, the first pushing member 81 and the first driving member 91 can also be used to compress the end of the first main elastic member 61 away from the first sliding member 71 to increase the compression stroke of the first main elastic member 61, thereby increasing the damping force provided for the first fixed plate 500 and the first shell 210.

[0134] Specifically, the second concave cam 30B is rotatably connected to the first mounting shaft 41, and the first pushing member 81 and the first driving member 91 are both slidably connected to the first mounting shaft 41. Along the axial direction of the first mounting shaft 41, the first driving member 91 is located between the first main elastic member 61 and the first limit member 51, the second concave cam 30B is located at one end of the first rotating body 22A away from the first concave cam 30A, and the first pushing member 81 is located at the side of the second concave cam 30B away from the first rotating body 22A. That is, the first driving member 91, the first main elastic member 61, the first sliding member 71, the first concave cam 30A, the first rotating body 22A, the second concave cam 30B and the first pushing member 81 are arranged in sequence along the axial direction of the first mounting shaft 41. The two ends of the first main elastic member 61 abut against the first sliding member 71 and the first pushing member 81 respectively. The second concave-convex portion and the second matching portion match.

[0135] It can be understood that the first pushing member 81 and the first driving member 91 are both provided with a through hole penetrating along the Y-axis direction, and the first mounting shaft 41 passes through the through holes of the first pushing member 81 and the first driving member 91, so that the first pushing member 81 and the first driving member 91 are slidably connected to the first mounting shaft 41. The first mounting shaft 41 passes through the through hole 31 of the second concave cam 30B, so that the second concave cam 30B is rotatably connected to the first mounting shaft 41.

[0136] When the foldable electronic device 1000 is in the unfolded state, the protrusion of the second concave-convex portion abuts against the concave portion of the second matching portion.

[0137] When the foldable electronic device 1000 switches from the unfolded state to the folded state, the first fixed plate 500 rotates around the supporting base 400, the first swinging body 21A slides in the first sliding groove of the first fixed plate 500, and the first rotating body 22A simultaneously drives the first concave cam 30A and the second concave cam 30B to rotate along the first mounting shaft 41. During the rotation of the first concave cam 30A, the protrusion of the first concave cam 30A gradually switches to abutment with the protrusion of the first matching portion 221. During this process, the first concave cam 30A and the first matching portion 221 wear each other. At this time, the first sliding member 71 gradually moves toward the negative direction of the Y axis to compress one end of the first main elastic member 61. At the same time, during the rotation of the second concave cam 30B, the protrusion of the second concave cam 30B gradually switches to abutment with the protrusion of the second matching portion. During this process, the second concave-convex portion and the second matching portion of the second concave cam 30B wear each other. At this time, the first pushing member 81 gradually moves toward the positive direction of the Y-axis, and the first pushing member 81 drives the first driving member 91 to gradually move toward the positive direction of the Y-axis to compress the other end of the first main elastic member 61 to provide damping force for the first main elastic member 61. The two ends of the first main elastic member 61 are compressed synchronously, and the compression stroke of the first main elastic member 61 is doubled. Therefore, the damping force provided by the first main elastic member 61 to the first fixed plate 500 and the first shell 210 is greatly increased.

[0138] As can be seen from the above, during the movement of the second concave cam 30B, it is mainly in contact with the first matching portion and wears. If the wear of the second concave-convex portion of the second concave cam 30B is relatively serious, the movement stroke of the first sliding member 71 along the positive direction of the Y axis will be too short, which will in turn cause the compression stroke of the first main elastic member 61 to be shorter, and accordingly, the damping force provided by the first main elastic member 61 will decrease.

[0139] In the embodiment of the present application, the second concave cam 30B is provided with good wear resistance, so that the degree of wear when the second concave-convex portion of the second concave cam 30B and the second matching portion move in coordination can be reduced, thereby allowing the first sliding member 71 to move a sufficient distance along the positive direction of the Y-axis to ensure the compression stroke of the first main elastic member 61. Correspondingly, the damping force provided by the first main elastic member 61 is guaranteed, thereby ensuring the opening and closing feel of the foldable electronic device 1000.

[0140] For some examples, please refer to Fig.21 , Fig. 22 and Fig.23 , the second rotating body 22B, the third concave cam 30C, the fourth concave cam 30D, the second mounting shaft 42, the second stopper 52, the second main elastic member 62, the second sliding member 72, the second pushing member 82 and the second driving member 92 cooperate to provide damping force for the second fixed plate 600 and the second housing 220. The process of the second fixed plate 600 and the second housing 220 obtaining the damping force is the same as the process of the first fixed plate 500 and the first housing 210 obtaining the damping force, which will not be repeated. The principle of the third concave cam 30C ensuring that the second main elastic member 62 provides sufficient damping force is the same as the principle of the first concave cam 30A ensuring that the first main elastic member 61 provides sufficient damping force, and the principle of the fourth concave cam 30D ensuring the damping force of the second main elastic member 62 is the same as the principle of the second concave cam 30B ensuring that the first main elastic member 61 provides sufficient damping force, which will not be repeated.

[0141] For some examples, please refer to Fig.19 and Fig. 20 , the damping force can be further increased by using the auxiliary elastic member 63 and the connecting shaft 64. The number of the connecting shaft 64 and the auxiliary elastic member 63 can be one, two, three or four, etc., which is not limited in this application. Fig.21 , Fig. 22 and Fig.23 The two opposite ends of the connecting shaft 64 are respectively slidably connected to the first connecting member 73 and the third connecting member 93. The auxiliary elastic member 63 is slidably sleeved on the connecting shaft 64.

[0142] When the first sliding member 71 moves along the negative direction of the Y axis, and the first driving member 91 moves along the positive direction of the Y axis, the first connecting member 73 is fixedly connected to the first sliding member 71, and the third connecting member 93 is fixedly connected to the first driving member 91. The first connecting member 73 moves synchronously with the first sliding member 71, and the third connecting member 93 moves synchronously with the first driving member 91, so that both ends of the auxiliary elastic member 63 are compressed synchronously, thereby increasing the damping force.

[0143] It is understandable that the auxiliary elastic member 63 and the connecting shaft 64 can also provide damping force for the second fixing plate 600 and the second housing 220. Details are omitted here.

[0144] For some examples, please refer to Fig.21 , Fig. 22 and Fig.23 The outer circumference of the first rotating body 22A is provided with a first driving tooth 222, and the outer circumference of the second rotating body 22B is provided with a second driving tooth 223. The first rotating body 22A is rotationally connected to the first installation shaft 41, and the second rotating body 22B is rotationally connected to the second installation shaft 42; the first driving tooth 222 and the second driving tooth 223 are transmission-connected. In this way, the first fixing plate 500 and the second fixing plate 600 can be synchronously rotated, that is, the synchronization of the rotation of the first shell 210 and the second shell 220 can be achieved.

[0145] When the first fixing plate 500 and the first shell 210 rotate around the bearing base 400, the second fixing plate 600 and the second shell 220 can be driven to rotate synchronously. When the second fixing plate 600 and the second shell 220 rotate around the bearing base 400, the first fixing plate 500 and the first shell 210 can be driven to rotate synchronously. The following is an example of the first fixing plate 500 and the first shell 210 rotating around the bearing base 400 and driving the second fixing plate 600 and the second shell 220 to rotate synchronously.

[0146] Specifically, when the first housing 210 and the first fixed plate 500 rotate around the bearing base 400, the first rotating body 22A of the first damping swing arm 10A rotates, and the first driving tooth 222 and the second driving tooth 223 are in transmission connection, so that the first rotating body 22A drives the second rotating body 22B of the second damping swing arm 10B to rotate. The second rotating body 22B drives the second swinging body 21B to slide and rotate, and the second swinging body 21B drives the second fixed plate 600 and the second housing 220 to rotate, so that the first housing 210 and the second housing 220 rotate synchronously.

[0147] For some examples, please refer to Fig.21 , Fig. 22 and Fig.23The rotating mechanism 100 further includes a support frame and N synchronous gears, where N is an even number, that is, the number of synchronous gears can be two, four, six or eight, etc. In a specific embodiment, there are two synchronous gears. The two synchronous gears are a first synchronous gear 224 and a second synchronous gear 225, respectively. The first synchronous gear 224 and the second synchronous gear 225 are meshed with each other, and the first synchronous gear 224 is also meshed with the first driving gear 222, and the second synchronous gear 225 is also meshed with the second driving gear 223.

[0148] The support frame is disposed between the first rotating body 22A and the second rotating body 22B, and the first installation shaft 41 and the second installation shaft 42 also pass through the support frame. The fixed shafts extending from both ends of the synchronous gear are connected to the support frame and the second connecting member 83 respectively.

[0149] When the first housing 210 and the first fixed plate 500 rotate around the bearing base 400, the first rotating body 22A of the first damping swing arm 10A rotates, and the power of the first rotating body 22A is transmitted to the second rotating body 22B through the first driving gear 222, the first synchronous gear 224, the second synchronous gear 225 and the second driving gear 223, so that the second rotating body 22B of the second damping swing arm 10B rotates. The second rotating body 22B drives the second swinging body 21B to slide and rotate, and the second swinging body 21B drives the second fixed plate 600 and the second housing 220 to rotate, so that the first housing 210 and the second housing 220 rotate synchronously.

[0150] In some other embodiments, the rotating mechanism 100 may not be provided with a synchronous gear, but the synchronous transmission is achieved by directly meshing the first driving teeth 222 and the second driving teeth 223 .

[0151] The above are only some embodiments and implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A rotating mechanism, characterized in that: include: A damping swing arm, the damping swing arm comprising a body and a concave cam; The main body comprises a swinging body and a rotating body, and along the length direction of the damping swing arm, the swinging body and the rotating body are fixedly connected; along the width direction of the damping swing arm, the concave cam and the rotating body are coaxial and fixedly connected; The body has a first Rockwell hardness, and the concave cam has a second Rockwell hardness, wherein the second Rockwell hardness is greater than the first Rockwell hardness.

2. The rotating mechanism according to claim 1, characterized in that: The first Rockwell hardness A1 satisfies the following condition: A1≥a, and the second Rockwell hardness A2 satisfies the following condition: A2<a, wherein 50HRC≥a≥45HRC.

3. The rotating mechanism according to claim 1, characterized in that: The body has a first yield strength, and the concave cam has a second yield strength, the second yield strength being less than the first yield strength.

4. The rotating mechanism according to any one of claims 1 to 3, characterized in that: The concave cam includes a concave-convex portion and a first mounting end opposite to each other along its axial direction, and the rotating body includes two second mounting ends opposite to each other along its axial direction; the first mounting end is provided with a first limiting groove, and at least one of the second mounting ends is provided with a first limiting protrusion; or, the second mounting end is provided with a first limiting groove, and at least one of the first mounting ends is provided with a first limiting protrusion; the first limiting protrusion extends into the first limiting groove to limit the circumferential and / or radial movement of the concave cam.

5. The rotating mechanism according to claim 4, characterized in that: The first limiting protrusion is interference-fitted with the first limiting groove so that the concave cam and the rotating body are fixedly connected.

6. The rotating mechanism according to claim 4, characterized in that: The concave cam coincides with the axial center line of the rotating body, there are multiple first limiting protrusions, there are multiple first limiting grooves, multiple first limiting protrusions are arranged at intervals around the axial center line, and multiple first limiting grooves are arranged at intervals around the axial center line.

7. The rotating mechanism according to claim 6, characterized in that: A second limiting groove is formed between two adjacent first limiting protrusions, and a second limiting protrusion is formed between two adjacent first limiting grooves; the second limiting protrusion extends into the second limiting groove to limit the circumferential and / or radial movement of the concave cam.

8. The rotating mechanism according to any one of claims 1 to 3, characterized in that: The concave cam includes a concave-convex portion and a first mounting end which are opposite to each other in its axial direction, and the rotating body includes two second mounting ends which are opposite to each other in its axial direction; the second mounting end is provided with a third limiting protrusion, and the first mounting end is provided with a third limiting groove; or, the second mounting end is provided with a third limiting groove, and the first mounting end is provided with a third limiting protrusion; the rotating body and the concave cam have the same axial direction, and the third limiting protrusion extends into the third limiting groove to limit the movement of the concave cam along the axial direction.

9. The rotating mechanism according to claim 8, characterized in that: Along the axial direction, the width of the third limiting protrusion gradually increases, and the width of the third limiting groove gradually increases.

10. The rotating mechanism according to claim 8, characterized in that: The third limiting protrusion includes two axial limiting surfaces facing away from each other along the axial direction, and the third limiting groove includes two axial limiting groove surfaces facing each other along the axial direction; the two axial limiting surfaces are respectively opposite to the two axial limiting groove surfaces.

11. The rotating mechanism according to any one of claims 1 to 3, characterized in that: The concave cam and the rotating body are fixed by welding; or, the concave cam and the rotating body are fixed by bonding.

12. The rotating mechanism according to any one of claims 1 to 3, characterized in that: The concave cam comprises a first concave cam, wherein the first concave cam is provided with a first concave-convex portion; The rotating mechanism further comprises a first mounting shaft, a first position-limiting member, a first main elastic member and a first sliding member; the first sliding member is provided with a first matching portion; The first position-limiting member is fixed to the first mounting shaft, the first main elastic member and the first sliding member are both slidably connected to the first mounting shaft, and two ends of the first main elastic member abut against the first position-limiting member and the first sliding member respectively; The first concave cam and the rotating body are both rotatably connected to the first mounting shaft; Along the axial direction of the first installation shaft, the first position-limiting member, the first main elastic member, the first sliding member, the first concave cam and the rotating body are arranged in sequence; the first concave-convex portion and the first matching portion match; The protrusion of the first concave-convex part abuts against the protrusion of the first matching part, and the first main elastic member is in a compressed state; The protrusion of the first concave cam abuts against the concave portion of the first matching portion, and the first main elastic member is in a pre-compressed state.

13. The rotating mechanism according to claim 12, characterized in that: The concave cam further comprises a second concave cam, wherein the second concave cam is provided with a second concave-convex portion; The rotating mechanism further comprises a first pushing member and a first driving member, wherein the first pushing member and the first driving member are fixedly connected; the first pushing member is provided with a second matching portion; The second concave cam is rotatably connected to the first installation shaft, and the first pushing member and the first driving member are both slidably connected to the first installation shaft; Along the axial direction of the first mounting shaft, the first driving member is located between the first main elastic member and the first limiting member, the second concave cam is located at an end of the rotating body away from the first concave cam, and the first pushing member is located at a side of the second concave cam away from the rotating body; the second concave-convex portion and the second matching portion match; The first main elastic member is in a compressed state, and the protrusion of the second concave-convex portion abuts against the protrusion of the second matching portion; The first main elastic member is in a pre-compressed state, and the protrusion of the second concave-convex portion abuts against the concave portion of the second matching portion.

14. The rotating mechanism according to any one of claims 1 to 3, characterized in that: There are two damping swing arms, which are respectively a first damping swing arm and a second damping swing arm. The first damping swing arm includes a first swinging body and a first rotating body, and the second damping swing arm includes a second swinging body and a second rotating body. The outer circumference of the first rotating body is provided with a first driving tooth, and the outer circumference of the second rotating body is provided with a second driving tooth. The rotating mechanism also includes a first installation shaft and a second installation shaft, the first installation shaft and the second installation shaft are parallel and spaced apart; the first rotating body is rotationally connected to the first installation shaft, and the second rotating body is rotationally connected to the second installation shaft; the first driving tooth and the second driving tooth are drivingly connected.

15. A foldable electronic device, characterized in that: The invention comprises a first shell, a second shell and the rotating mechanism according to any one of claims 1 to 14; the rotating mechanism is connected between the first shell and the second shell.

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