Hub, support device and electronic equipment

Abstract

The present invention discloses a hub, a supporting device and an electronic device, wherein the hub comprises: a first gear set, comprising a first gear and a second gear meshing with each other, and the diameter of the second gear is smaller than the diameter of the first gear; a second gear set, comprising a third gear and a fourth gear meshing with each other, and the third gear rotates synchronously with the second gear; the gear shaft of the first gear and the gear shaft of the fourth gear extend outward away from each other's ends to form a first axis and a second axis respectively; a connecting member, having a sleeve portion and a mounting portion connected to each other, the sleeve portion being sleeved on the first axis and / or the second axis, and the first axis and / or the second axis being rotatable in the axial hole of the sleeve portion; the first axis rotates, driving the first gear, the second gear, the third gear, the fourth gear and the second axis to rotate in sequence, and the rotation speed of the first axis is smaller than the rotation speed of the second axis. The hub in the present invention can prevent the electronic device from falling backward.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic equipment, and in particular to a hub, a supporting device and an electronic equipment. Background Art

[0002] At present, mobile terminals, such as mobile phones and tablet computers, generally have large display touch screens that allow users to directly touch and control without the use of external devices such as a mouse. However, when using a mobile terminal for office work or playing games, a keyboard is still needed to improve the convenience of use. In this case, the mobile terminal and keyboard are generally detachably connected to a hub so that the two can be rotated and overlapped or opened to a certain angle. However, since the keyboard is the base in this case and the mobile terminal that combines the host and screen is the rotating component, the weight of the rotating component exceeds the weight of the base. When the rotating component rotates to a large angle relative to the base, the base will not be able to independently complete the effective support of the rotating component, and the entire device will fall backward, affecting the user's use. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to solve the problem that if the weight of the rotating part exceeds the weight of the base, the rotating part will fall backward when it rotates to a larger angle relative to the base, affecting user use.

[0004] To this end, according to a first aspect, the present invention provides a hub device, comprising: a first gear set, comprising a first gear and a second gear meshing with each other, and the diameter of the second gear is smaller than the diameter of the first gear; a second gear set, comprising a third gear and a fourth gear meshing with each other, and the third gear rotates synchronously with the second gear; the gear shaft of the first gear and the gear shaft of the fourth gear extend outward away from each other's ends to form a first axis and a second axis respectively; a connecting member, comprising a sleeve portion and an installation portion that are connected to each other, the sleeve portion is sleeved on the first axis and / or the second axis, and the first axis and / or the second axis can rotate in the shaft hole of the sleeve portion; the first axis rotates, driving the first gear, the second gear, the third gear, the fourth gear and the second axis to rotate in sequence, and the rotation speed of the first axis is less than the rotation speed of the second axis.

[0005] Furthermore, the outer wall surface of the first gear includes an engaging portion having a gear structure and a disengaging portion having a circumferential surface; when the first axis rotates to a first preset angle and the second axis rotates to a second preset angle, the outer wall surface of the first gear close to the second gear switches from the engaging portion to the disengaging portion, and the rotation of the first axis only drives the first gear to rotate.

[0006] Furthermore, a first limiting wheel is provided at the end of the first gear, which rotates synchronously with the first gear, and the outer wall surface of the first limiting wheel has a first circumferential portion and a second circumferential portion, and the radius of the first circumferential portion is smaller than the radius of the second circumferential portion; a second limiting wheel is provided at the end of the second gear, which rotates synchronously with the second gear, and the second limiting wheel is arranged corresponding to the first limiting wheel, and the outer wall surface of the second limiting wheel has a third circumferential portion and a first circular arc groove; when the outer wall surface of the first gear close to the second gear switches from the meshing portion to the disengaging portion, the outer wall surface of the first limiting wheel close to the second limiting wheel switches from the first circumferential portion to the second circumferential portion, and the outer wall surface of the second limiting wheel close to the first limiting wheel switches from the third circumferential portion to the first circular arc groove, and the second circumferential portion and the first circular arc groove cooperate to limit the rotation of the second gear.

[0007] Furthermore, an arc convex portion is provided at the switching position between the first circumferential portion and the second circumferential portion of the outer wall surface of the first limiting wheel, and the tip of the arc convex portion extends outside the tooth top of the first gear; a second arc groove corresponding to the arc convex portion is provided on the outer wall surface of the second limiting wheel.

[0008] Furthermore, a first limit member is provided on the part of the second axis located in the axial hole of the sleeve part, and a second limit member corresponding to the first limit member is provided in the axial hole of the sleeve part. When the second axis rotates to a third preset angle, the first limit member abuts against the second limit member to limit the rotation of the second axis.

[0009] Furthermore, a third limit member is provided on the part of the first axis located in the axial hole of the sleeve part, and a fourth limit member corresponding to the third limit member is provided in the axial hole of the sleeve part. When the first axis rotates to the fourth preset angle, the third limit member abuts against the fourth limit member to limit the rotation of the first axis.

[0010] Furthermore, a torsion piece is also provided on the first axis and / or the second axis.

[0011] Furthermore, the hub also includes: a circumferential sleeve, the first gear set, the second gear set and the sleeve portion of the connecting piece are all arranged in the circumferential sleeve, the first axis and the second axis extend to the outside of the circumferential sleeve along the end through holes of the circumferential sleeve, and the mounting portion of the connecting piece extends to the outside of the circumferential sleeve through the corresponding slots arranged on the secondary side wall of the circumferential sleeve.

[0012] According to the second aspect, the present invention provides a supporting device, comprising: the hub device described in the first aspect above; a supporting member, connected to the second axis and rotating synchronously with the second axis; a first mounting member, connected to the connecting member, and the second mounting member is used to install a keyboard; a second mounting member, connected to the first axis and rotating synchronously with the first axis, and the second mounting member is used to install a mobile terminal.

[0013] According to a third aspect, the present invention provides an electronic device comprising: the hub device described in the first aspect above; a support member connected to the second axis and rotating synchronously with the second axis; a first body connected to the connecting member; and a second body connected to the first axis and rotating synchronously with the first axis.

[0014] The technical solution provided by the present invention has the following advantages:

[0015] 1. The hub provided by the present invention sets the diameter of the second gear in the first gear set to be smaller than the diameter of the first gear, so that the rotation speed of the second gear is greater than the rotation speed of the first gear, and then sets the third gear in the second gear set to rotate synchronously with the second gear, so that the fourth gear in the second gear set can be driven to rotate by the first gear, and the rotation speed of the fourth gear is greater than the rotation speed of the first gear (when the diameter of the third gear is the same as the diameter of the fourth gear, or the diameter of the fourth gear is smaller than the diameter of the third gear, or the diameter of the fourth gear is slightly larger than the diameter of the third gear, the rotation speed of the fourth gear is relative to the rotation speed of the third gear). When the reduction in speed is less than the increase in the speed of the second gear relative to the speed of the first gear, the speed of the fourth gear can be made greater than the speed of the first gear), so that when the weight of the rotating component connected to the first axis of the hub device (formed by the extension of the gear shaft of the first gear) exceeds the weight of the base connected to the connecting component, the support component can be connected to the second axis of the hub device (formed by the extension of the gear shaft of the first gear), and then when the rotating component rotates to a larger angle relative to the base, the support component can reach a supporting state of 180 degrees with the base before the rotating component, thereby preventing the rotating component from falling backward and making it convenient for users to use.

[0016] 2. The hub device provided by the present invention is configured to have an outer wall surface of the first gear including an engaging portion having a gear structure and a toothed portion having a circumferential surface, and to configure the first axis to rotate to a first preset angle. When the second axis rotates to a second preset angle, the outer wall surface of the first gear close to the second gear switches from the engaging portion to the toothed portion, so that when the support member connected to the second axis of the hub device rotates to a second preset angle that can play an effective supporting role, the angle of the support member no longer changes with the rotation of the rotating member connected to the first axis, that is, at this time the support member is maintained at the second preset angle that plays an effective supporting role, and the angle of the rotating member itself can be freely adjusted according to the user's usage requirements, thereby further meeting the user's usage needs.

[0017] 3. The hub device provided by the present invention provides corresponding first limiting wheels and second limiting wheels at the ends of the first gear and the second gear respectively, and the first limiting wheel is provided with a second circumferential portion, and the second limiting wheel is provided with a first arc groove, and when the outer wall surface of the first gear close to the second gear switches from the meshing portion to the disengaging portion, the outer wall surfaces of the first limiting wheel and the second limiting wheel close to each other are respectively the second circumferential portion and the first arc groove, so that the rotation of the second gear is limited by the mutual cooperation of the second circumferential portion and the first arc groove to prevent the second gear from rotating in the opposite direction, that is, it can prevent the support member connected to the second axis of the hub device from reaching the second preset angle for effective support, and not from retracting with the rotating member connected to the first axis (the rotating member rotates toward the connecting member, and the angle between the two is reduced), but from rotating independently, thereby improving the stability of the hub device.

[0018] 4. In the hub device provided by the present invention, when the outer wall surface of the first gear close to the second gear switches from the meshing portion to the disengaging portion, the outer wall surface of the first limiting wheel close to the second limiting wheel will correspondingly switch from the first circumferential portion to the second circumferential portion. By providing a first arc convex portion at the switching position between the first circumferential portion and the second circumferential portion, and providing a tip of the first arc convex portion to extend outside the tooth top of the first gear, the teeth corresponding to the tip of the protective arc convex portion can be prevented from rubbing and colliding with the second circumferential portion of the first limiting wheel when the first gear and the second gear are slightly misaligned during installation or use of the hub device, thereby improving the service life of the first gear, that is, the hub device.

[0019] 5. In the support device provided by the present invention, the rotation speed of the support member relative to (i.e., the keyboard) is greater than the rotation speed of the second mounting member (i.e., the mobile terminal) relative to the keyboard. Therefore, during the rotation of the mobile terminal, the support member rotates faster than the mobile terminal and reaches an angle in advance that can provide effective support. This can prevent the problem of the entire support device falling backward under the weight of the mobile terminal when the mobile terminal is rotated to a larger angle, thereby improving the stability of the support device and making it more convenient for users to use.

[0020] 6. In the electronic device provided by the present invention, the rotation speed of the support member relative to the first body is greater than the rotation speed of the second body relative to the first body. Therefore, during the rotation of the second body, the support member rotates faster than the second body and reaches an angle that can play an effective supporting role in advance. This can prevent the problem of the entire electronic device falling backward under the weight of the second body when the second body rotates to a larger angle and the weight of the second body is greater than the weight of the first body. This improves the stability of the electronic device and is more convenient for users to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of an electronic device provided by an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Structural explosion diagram of electronic equipment in;

[0024] Figure 3 and Figure 4 A schematic diagram of the structure of a hub provided by an embodiment of the present invention;

[0025] Figure 5 and Figure 6 A schematic diagram of the specific structure of the first gear and the second gear provided in an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention when closed;

[0027] Figure 8 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention when it is opened;

[0028] Figure 9 A schematic diagram of the specific structure of the first and second limit members provided in an embodiment of the present invention;

[0029] Figure 10 A schematic diagram of the specific structure of the third and fourth limiting members provided in an embodiment of the present invention;

[0030] Figure 11 and Figure 12 A schematic diagram of the specific structures of the first limiting wheel and the second limiting wheel provided in an embodiment of the present invention;

[0031] Description of reference numerals:

[0032] 1- Hub;

[0033] 11-first gear; 111-engaging portion; 112-tooth-removing portion; 113-first limiting wheel; 113a-first circumferential portion; 113b-second circumferential portion; 113c-arc convex portion;

[0034] 12-second gear; 121-second limiting wheel; 121a-third circumferential portion; 121b-first arc groove; 121c-second arc groove;

[0035] 13- third gear;

[0036] 14- fourth gear;

[0037] 15-first axis; 151-third limiter;

[0038] 16-second axis; 161-first limiter;

[0039] 17-connecting member; 171-sleeving portion; 171a-second limiting member; 171b-fourth limiting member; 172-installing portion;

[0040] 18-torque member;

[0041] 19-circumferential sleeve;

[0042] 2- First body;

[0043] 3- Second body;

[0044] 4-Support. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Please refer to Figures 1-12 The present application discloses an electronic device, which includes: a hub 1 and a support member 4 connected to the hub 1, a first body 2 and a second body 3, wherein the second body 3 and the support member 4 can be rotated relative to the first body 2 through the hub 1, and the rotation speed of the second body 3 relative to the first body 2 is less than the rotation speed of the support member 41 relative to the first body 2. In the present application, the first body 2 can be a keyboard, the second body 3 can be a screen, the main body components of the computer can be integrated into the first body 2, and can also be integrated into the second body 3, and the connections between the first body 2, the second body 3 and the hub 1 can all be detachable connections, for example, the second body 3 can be plugged into the hub 1, and when the user only needs to use the second body 3, the second body 3 can be pulled out of the hub 1.

[0050] In the present application, what may be connected to the hub 1 may not be the first body 2 and the second body 3, but a mounting part for connecting an independent device. Specifically, the hub 1 may be connected to a first mounting part, a second mounting part and a support part 4. The second mounting part and the support part 4 may also be rotated relative to the first mounting part through the hub 1. The first mounting part, the second mounting part, the support part 4 and the hub 1 constitute a support device. When independent devices are connected to the first mounting part and the second mounting part, these independent devices and the support device together may also constitute an electronic device. In the present application, the first mounting part and the second mounting part may be two covers, and magnetic elements may be provided thereon. Independent devices may be adsorbed and mounted to the first mounting part and the second mounting part through the magnetic elements. Specifically, the first mounting part may be used to mount a keyboard (mechanical keyboard, membrane keyboard or touch keyboard, etc.), and the second mounting part may be used to mount a mobile terminal such as a smartphone or tablet computer. Of course, independent devices may also be mounted on the first mounting part and the second mounting part by means of a snap connection, a slide rail connection, etc.

[0051] Please refer to Figure 3The hub 1 includes a first gear set, a second gear set and a connecting member 17, wherein the first gear set includes a first gear 11 and a second gear 12 that are meshed with each other, and the diameter of the second gear 12 is smaller than the diameter of the first gear 11 (those skilled in the art should understand that the gear diameters in this application refer to the pitch circle diameter); the second gear set includes a third gear 13 and a fourth gear 14 that are meshed with each other, and the third gear 13 rotates synchronously with the second gear 12; the gear shafts of the first gear 11 and the gear shafts of the fourth gear 14 are away from each other. The first and second shafts 15, 16 are respectively extended outwards; the connecting member 17 has a sleeve portion 171 and a mounting portion 172 which are connected to each other, the sleeve portion 171 is sleeved on the first shaft 15 and / or the second shaft 16, and the first shaft 15 and / or the second shaft 16 can rotate in the axial hole of the sleeve portion 171; the first shaft 15 rotates, driving the first gear 11, the second gear 12, the third gear 13, the fourth gear 14 and the second shaft 16 to rotate in sequence, and the rotation speed of the first shaft 15 is less than the rotation speed of the second shaft 16.

[0052] In this application, please refer to Figure 2-Figure 4 The first gear set, the second gear set and the sleeve portion 171 of the connecting member 17 are all arranged in a circumferential sleeve 19, and the first axis 15 and the second axis 16 extend along the end through holes of the circumferential sleeve 19 to the outside of the circumferential sleeve 19, and the mounting portion 172 of the connecting member 17 extends to the outside of the circumferential sleeve 19 through the corresponding slots on the side wall of the circumferential sleeve 19.

[0053] In this application, the first body 2 (or the first mounting member in the support device) of the electronic device is connected to the connecting member 17, the second body 3 (or the second mounting member in the support device) is connected to the first axis 15 and rotates synchronously with the first axis 15, and the support member 4 is connected to the second axis 16 and rotates synchronously with the second axis 16. The hub 1 in the electronic device can be set to two. In this case, Figure 2 As shown, the two hubs 1 are symmetrically arranged with the central axis of the length direction of the first body 2 as the symmetry axis; of course, the hub 1 in the electronic device can also be one, in which case the end of the first body 2, the second body 3 and the support member 4 that is not connected to the hub 1 can be set as a bearing structure.

[0054] The following contents are all described by taking the first body 2 and the second body 3 connected to the connecting member 17 and the first axis 15 in the hub 1 as an example.

[0055] In the present application, the specific ratio relationship between the diameter of the first gear 11 and the diameter of the second gear 12, as well as the specific ratio relationship between the diameter of the third gear 13 and the diameter of the fourth gear 14 can be set according to the needs of the specific application scenario. Specifically, since the support member 4 can play an effective supporting role when it rotates to an angle of 180 degrees with the first body 2, the specific ratio relationship between the diameter of the first gear 11 and the diameter of the second gear 12 can be set according to the specific application scenario, when the second body 3 rotates to a certain degree with the first body 2, the support member 4 is required to rotate to an angle of 180 degrees with the first body 2, that is, according to the ratio requirement between the rotation speed of the first axis 15 and the rotation speed of the second axis 16; for example, if the support member 4 is required to play an effective supporting role when the second body 3 rotates to an angle of 90 degrees with the first body 2 (the rotation speed of the second axis 16 is required to be the same as that of the first axis), then the ratio relationship between the diameter of the first gear 11 and the diameter of the second gear 12 can be set according to the specific application scenario, when the second body 3 rotates to a certain degree with the first body 2, the support member 4 is required to play an effective supporting role (the rotation speed of the second axis 16 is required to be the same as that of the first axis). 15 times the rotation speed), the diameter of the first gear 11 can be set to be twice the diameter of the second gear 12, and the diameter of the third gear 13 can be set to be the same as the diameter of the fourth gear 14 (the drawings in this embodiment and the following description are all illustrated by this case); if the support member 4 is required to play an effective supporting role when the second body 3 rotates to form an angle of 120 degrees with the first body 2 (the rotation speed of the second axis 16 is required to be 1.5 times the rotation speed of the first axis 15), the diameter of the first gear 11 can be set to be the same as the diameter of the second gear 12, and the diameter of the third gear 13 can be set to be 1.5 times the diameter of the fourth gear 14; various other possible settings are not listed here one by one.

[0056] Please refer to Figure 5 and Figure 6 In the present application, the outer wall surface of the first gear 11 can also be set to include a meshing portion 111 with a gear structure and a toothed portion 112 with a circumferential surface, so that the first axis 15 rotates to the first preset angle. When the second axis 16 rotates to the second preset angle, the outer wall surface of the first gear 11 close to the second gear 12 switches from the meshing portion 111 to the toothed portion 112, and the rotation of the first axis 15 only drives the first gear 11 to rotate; thereby, after the support member 4 rotates to the second preset angle that can play an effective supporting role (at this time, the first axis 15 rotates to the first preset angle), the user can still adjust and increase the angle between the second body 3 and the first body 2 as needed, while the angle between the support member 4 and the first body 2 remains unchanged at the second preset angle that can play an effective supporting role, thereby meeting the user's usage needs.

[0057] Specifically, taking the first preset angle as 90 degrees and the second preset angle as 180 degrees as an example, please refer to Figures 1-8When the second body 3 rotates and the angle between it and the first body 2 increases from 0 degrees to 90 degrees, the outer wall surface of the first gear 11 close to the second gear 12 is the meshing portion 111, that is, the first gear 11 and the second gear 12 are meshed, the first gear 11 rotates 90 degrees, and the second gear 12 rotates 180 degrees under the drive of the first gear 11 (that is, the angle between the support member 4 and the first body 2 increases from 0 degrees to 180 degrees, as shown in FIG. Figure 1 and Figure 7 When the angle between the second body 3 and the first body 2 reaches 90 degrees, please refer to Figure 5 The outer wall surface of the first gear 11 close to the second gear 12 is the junction of the meshing portion 111 and the tooth-disengaging portion 112; the first body 2 continues to rotate so that the angle between the second body 3 and the first body 2 is greater than 90 degrees (in this process, the user can adjust the angle between the second body 3 and the first body 2 according to the needs of use, such as adjusting the angle to Figure 8 130 degrees shown), please refer to Figure 6 , the first gear 11 rotates accordingly, and its outer wall surface close to the second gear 12 switches to the tooth-off portion 112. Since the tooth-off portion 112 is a circumferential surface, the second gear 12 and the first gear 11 cannot engage, and the second gear 12 will not rotate under the drive of the first gear 11. Accordingly, Figure 8 As shown, the angle between the support member 4 and the first body 2 remains unchanged at 180 degrees; and when the second body 3 rotates, causing the angle between the second body 3 and the first body 2 to decrease to 90 degrees, the outer wall surface of the first gear 11 close to the second gear 12 switches from the disengaging portion 112 back to the meshing portion 111, the second gear 12 meshes with the first gear 11, and rotates under the drive of the first gear 11, driving the support member 4 to retract, and the angle between the support member 4 and the first body 2 gradually decreases.

[0058] In this application, please refer to Figure 3 and Figure 9 In order to make the second body 3 have a certain hovering ability when it rotates to any angle and prevent it from rotating under the action of its own weight and affecting user use, a torsion piece 18 can also be set on the first axis 15 and / or the second axis 16 ( Figure 3 and Figure 9 18 is disposed on the second axis 16 as an example.

[0059] In this application, please refer to Figure 9A first limiting member 161 may also be provided on the portion of the second axis 16 located in the axial hole of the sleeve portion 171, and a second limiting member 171a corresponding to the first limiting member 161 may be provided in the axial hole of the sleeve portion 171, so that when the second axis 16 rotates to a third preset angle, the first limiting member 161 abuts against the second limiting member 171a to limit the rotation of the second axis 16. Specifically, the third preset angle may be the same as the second preset angle, or may be slightly smaller than the second preset angle.

[0060] In this application, please refer to Figure 10 A third limiting member 151 may also be provided on the portion of the first axis 15 located in the axial hole of the sleeve portion 171, and a fourth limiting member 171b corresponding to the third limiting member 151 may be provided in the axial hole of the sleeve portion 171, so that when the first axis 15 rotates to the fourth preset angle, the third limiting member 151 abuts against the fourth limiting member 171b, limiting the rotation of the first axis 15, that is, limiting the maximum angle to which the second body 3 can rotate relative to the first body 2. The maximum angle (that is, the fourth preset angle) can be set according to the needs of the specific application scenario, for example, the maximum angle can be 120 degrees, 125 degrees or 130 degrees, etc.

[0061] In this application, please refer to Figure 10-12 In order to limit the second axis 16 so that its rotation after rotating to the second preset angle can only be carried out under the drive of the first axis 15, and to prevent it from rotating under other external forces and affecting the supporting stability of the support member 4, a first limiting wheel 113 that rotates synchronously with the first gear 11 can also be provided at the end of the first gear 11, and the outer wall surface of the first limiting wheel 113 is provided with a first circumferential portion 113a and a second circumferential portion 113b, and the radius of the first circumferential portion 113a is smaller than the radius of the second circumferential portion 113b; a second limiting wheel 121 that rotates synchronously with the second gear 12 is provided at the end of the second gear 12, and the second limiting wheel 121 rotates synchronously with the second gear 12. The first limiting wheel 113 is correspondingly arranged, and the outer wall surface of the second limiting wheel 121 has a third circumferential portion 121a and a first circular arc groove 121b; when the outer wall surface of the first gear 11 close to the second gear 12 switches from the meshing portion 111 to the disengaging portion 112, the outer wall surface of the first limiting wheel 113 close to the second limiting wheel 121 switches from the first circumferential portion 113a to the second circumferential portion 113b, and the outer wall surface of the second limiting wheel 121 close to the first limiting wheel 113 switches from the third circumferential portion 121a to the first circular arc groove 121b, and the second circumferential portion 113b and the first circular arc groove 121b cooperate to limit the rotation of the second gear 12.

[0062] Specifically, if Figure 11As shown, when the second body 3 rotates and the angle between it and the first body 2 increases from 0 degrees to 90 degrees, the outer wall surfaces of the first limiting wheel 113 and the second limiting wheel 121 close to each other are the first circumferential portion 113a and the third circumferential portion 121a, respectively, and the two do not interfere with each other; when the angle between the second body 3 and the first body 2 reaches 90 degrees, the outer wall surface of the first limiting member 161 close to the second limiting member 171a is the junction of the first circumferential portion 113a and the second circumferential portion 113b, and the second limiting member 161 is the outer wall surface of the second limiting member 171a close to the first circumferential portion 113a and the second circumferential portion 113b. The outer wall surface of the member 171a close to the first limiting member 161 is the first arc groove 121b; the first body 2 continues to rotate, so that the angle between the second body 3 and the first body 2 is greater than 90 degrees, and the outer wall surface of the first limiting member 161 close to the second limiting member 171a is switched to the second circumferential portion 113b, and the second limiting member 171a does not rotate, that is, the outer wall surface close to the first limiting member 161 is still the first arc groove 121b, and the second circumferential portion 113b and the first arc groove 121b produce a matching relationship, such as Figure 12 As shown, at this time, the second limiting member 171a cannot rotate relative to the first limiting member 161, so that the second gear 12, that is, the second shaft 16 and the second body 3 cannot rotate independently.

[0063] In this application, in order to prevent the problem that the teeth at the switching position of the meshing portion 111 and the tooth-disengaging portion 112 in the first gear 11 rub against the first limiting wheel 113 (mainly to prevent friction and collision with the second circumferential portion 113b with a larger radius in the first limiting wheel 113) when the first gear 11 and the second gear 12 are slightly misaligned during the installation or use of the hub device 1, the service life of the first gear 11 is improved, and please refer to Figure 9 and Figure 10 A convex arc portion 113c can also be provided at the switching position between the first circumferential portion 113a and the second circumferential portion 113b on the outer wall of the first limiting wheel 113, and the tip of the convex arc portion 113c extends to the outside of the tooth top of the first gear 11 to protect the tooth corresponding to the tip of the convex arc portion 113c; accordingly, a second arc groove 121c corresponding to the convex arc portion 113c is provided on the outer wall of the second limiting wheel 121.

[0064] The hub device 1 in the present application is configured such that the diameter of the second gear 12 in the first gear group is smaller than the diameter of the first gear 11, so that the rotation speed of the second gear 12 is greater than the rotation speed of the first gear 11, and then the third gear 13 in the second gear group is configured to rotate synchronously with the second gear 12, so that the fourth gear 14 in the second gear group can be driven to rotate by the first gear 11, and the rotation speed of the fourth gear 14 is greater than the rotation speed of the first gear 11 (when the diameter of the third gear 13 is the same as the diameter of the fourth gear 14, or the diameter of the fourth gear 14 is smaller than the diameter of the third gear 13, or the diameter of the fourth gear 14 is slightly larger than the diameter of the third gear 13, the reduction in the rotation speed of the fourth gear 14 relative to the rotation speed of the third gear 13 is less than When the rotation speed of the second gear 12 increases relative to the rotation speed of the first gear 11, the rotation speed of the fourth gear 14 can be made greater than the rotation speed of the first gear 11). Therefore, when the weight of the rotating component connected to the first axis 15 of the hub 1 (formed by the extension of the gear shaft of the first gear 11) exceeds the weight of the base connected to the connecting member 17, the support member 4 can be connected to the second axis 16 of the hub 1 (formed by the extension of the gear shaft of the first gear 11). Then, when the rotating component rotates to a larger angle relative to the base, the support member 4 can reach a supporting state of 180 degrees with the base before the rotating component, preventing the rotating component from falling backward, so that the electronic device or support device equipped with the hub 1 will not have the problem of falling backward, which is convenient for users to use.

[0065] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A hub, characterized in that: include: A first gear set comprises a first gear (11) and a second gear (12) meshing with each other, wherein the diameter of the second gear (12) is smaller than the diameter of the first gear (11); a second gear set comprising a third gear (13) and a fourth gear (14) meshing with each other, wherein the third gear (13) rotates synchronously with the second gear (12); ends of the gear shaft of the first gear (11) and the gear shaft of the fourth gear (14) extending outwardly away from each other respectively form a first axis (15) and a second axis (16); A connecting member (17) having a sleeve portion (171) and a mounting portion (172) connected to each other, wherein the sleeve portion (171) is sleeved on the first axis (15) and / or the second axis (16), and the first axis (15) and / or the second axis (16) can rotate within the shaft hole of the sleeve portion (171); The first axis (15) rotates, driving the first gear (11), the second gear (12), the third gear (13), the fourth gear (14) and the second axis (16) to rotate in sequence, and the rotation speed of the first axis (15) is lower than the rotation speed of the second axis (16); The outer wall surface of the first gear (11) includes a meshing portion (111) having a gear structure and a tooth-disengaging portion (112) having a circumferential surface; a first limiting wheel (113) is provided at the end of the first gear (11) and rotates synchronously with the first gear (11); the outer wall surface of the first limiting wheel (113) has a first circumferential portion (113a) and a second circumferential portion (113b), and the radius of the first circumferential portion (113a) is smaller than the radius of the second circumferential portion (113b); a second limiting wheel (121) is provided at the end of the second gear (12) and rotates synchronously with the second gear (12); the second limiting wheel (121) is provided corresponding to the first limiting wheel (113), and the outer wall surface of the second limiting wheel (121) has a third circumferential portion (121a) and a first arc groove (121b); An arc convex portion (113c) is further provided at the switching position between the first circumferential portion (113a) and the second circumferential portion (113b) on the outer wall surface of the first limiting wheel (113), and the tip of the arc convex portion (113c) extends outside the tooth top of the first gear (11); and a second arc groove (121c) corresponding to the arc convex portion (113c) is provided on the outer wall surface of the second limiting wheel (121).

2. The hinge device according to claim 1, characterized in that: A first limiting member (161) is provided on the portion of the second axis (16) located in the axial hole of the sleeve portion (171), and a second limiting member (171a) corresponding to the first limiting member (161) is provided in the axial hole of the sleeve portion (171). When the second axis (16) rotates to a third preset angle, the first limiting member (161) abuts against the second limiting member (171a), thereby limiting the rotation of the second axis (16).

3. The hinge device according to claim 1 or 2, characterized in that: A third limiting member (151) is provided on the portion of the first axis (15) located in the axial hole of the sleeve portion (171), and a fourth limiting member (171b) corresponding to the third limiting member (151) is provided in the axial hole of the sleeve portion (171). When the first axis (15) rotates to a fourth preset angle, the third limiting member (151) abuts against the fourth limiting member (171b), thereby limiting the rotation of the first axis (15).

4. The hinge device according to claim 1, characterized in that: A torsion piece (18) is also provided on the first axis (15) and / or the second axis (16).

5. The hinge device according to claim 4, characterized in that: Also includes: A circumferential sleeve (19), the first gear set, the second gear set and the sleeve portion (171) of the connecting member (17) are all arranged in the circumferential sleeve (19), the first axis (15) and the second axis (16) extend to the outside of the circumferential sleeve (19) along the end through holes of the circumferential sleeve (19), and the mounting portion (172) of the connecting member (17) extends to the outside of the circumferential sleeve (19) through the corresponding slots arranged on the side wall surface of the circumferential sleeve (19).

6. A supporting device, characterized in that: include: The hub (1) according to any one of claims 1 to 5; A support member (4) connected to the second axis (16) and rotating synchronously with the second axis (16); a first mounting member connected to the connecting member (17), the first mounting member being used to mount a keyboard; A second mounting member is connected to the first axis (15) and rotates synchronously with the first axis (15), and the second mounting member is used for mounting a mobile terminal.

7. An electronic device, characterized in that: include: The hub (1) according to any one of claims 1 to 5; A support member (4) connected to the second axis (16) and rotating synchronously with the second axis (16); A first body (2) connected to the connecting member (17); The second body (3) is connected to the first axis (15) and rotates synchronously with the first axis (15).

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