WO2022183848A1

WO2022183848A1 - Rotating shaft and device having same

Info

Publication number: WO2022183848A1
Application number: PCT/CN2022/071464
Authority: WO
Inventors: 彭永锋
Original assignee: 荣耀终端有限公司
Priority date: 2021-03-04
Filing date: 2022-01-11
Publication date: 2022-09-09
Also published as: CN113074182A; CN113074182B

Abstract

A rotating shaft (30) and a device (100) having same. The rotating shaft (30) comprises a fixed bracket (31), a spindle (32), a damping structure (33), a transmission structure (35), and a movable bracket (34). The spindle (32) is rotatably connected to the fixed bracket (31) with itself as the axis; the damping structure (33) is used for providing damping torque, such that two components connected to the rotating shaft (30) can be maintained at target opening/closing angle positions; the transmission structure (35) has a rotation input end and a rotation output end; the rotation output end of the transmission structure (35) is coaxially fixed to the spindle (32); the rotation input end of the transmission structure (35) is fixed to the movable bracket (34); and the transmission ratio of the transmission structure (35) is less than one.

Description

A rotating shaft and equipment mounted with the rotating shaft

This application claims the priority of the Chinese patent application with the application number of 202110241992.7 and the invention titled "A Rotating Shaft and Equipment Installed with the Rotating Shaft", which was submitted to the State Intellectual Property Office on March 4, 2021, the entire contents of which are incorporated by reference in in this application.

technical field

The present application relates to the technical field of equipment installed with a rotating shaft, and in particular, to a rotating shaft and a device such as a notebook computer, a flip phone, a mobile phone bracket, and the like equipped with a rotating shaft.

Background technique

At present, mobile phone brackets, laptops, flip phones and other devices are equipped with rotating shafts. The rotating shaft acts as a rotary connection bridge between two components in these devices. Its cost, service life and user experience affect the cost, service life and user experience of the entire device. user experience.

A damping structure is arranged in the rotating shaft, and the damping structure is used to provide damping torque, so that the two components connected with the rotating shaft can be maintained at the target opening and closing angle position. In the prior art, the damping structure needs to provide a relatively large damping torque so that the two components connected with the rotating shaft can be kept at the target opening and closing angle position. In order to achieve this purpose, there are higher requirements on the material wear resistance and elastic force of the damping structure, so the cost of the damping structure is relatively high. At the same time, the damping structure and the rotating shaft are prone to wear failure, the damping torque decays quickly, and the life of the rotating shaft is short. Moreover, in order to reserve a sufficient torque loss margin, the designed initial damping torque is large, resulting in a large initial opening and closing force between the two components, thereby affecting the user experience.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a rotating shaft and a device mounted with the rotating shaft, which can reduce the requirements on material wear resistance and elastic force of the damping structure, prolong the service life of the rotating shaft, and enhance user experience.

To achieve the above object, the embodiments of the present application adopt the following technical solutions:

In the first aspect, some embodiments of the present application provide a rotating shaft, the rotating shaft includes a fixed bracket, a shaft core, a damping structure, a transmission structure and a movable bracket; the shaft core is rotatably connected to the fixed bracket with itself as an axis, and the damping structure is used for Provide damping torque, so that the two parts connected by the rotating shaft can be kept at the target opening and closing angle position; The input end is fixed with the movable bracket, and the transmission ratio i ₁₂ of the transmission structure is less than 1.

In this embodiment, a transmission structure is added to the rotating shaft, and the transmission ratio i ₁₂ of the transmission structure is less than 1. The movable bracket is used as the input component of torque. Assuming that its input torque under its own weight and load (that is, the gravity of the component connected to the movable bracket) is T1, the output torque of the transmission structure is T2, T2=T1*i ₁₂ *η. η represents the transmission efficiency of the transmission, and η is less than or equal to 1. Since i ₁₂ is less than 1, the output torque T2 of the transmission structure is less than the input torque T1 of the transmission structure. It can be seen from this that the damping structure only needs to provide damping torque T' to overcome the output torque T2 of the transmission structure. Specifically, the damping torque T' and the output torque T2 are opposite in direction and equal in magnitude. Since the damping torque T' is proportional to the pressure F exerted by the damping structure on the friction surface, the pressure F exerted by the damping structure on the friction surface is relatively small. Under the condition of ensuring a certain service life of the rotating shaft, the requirements for the elastic force and wear resistance of the damping structure are relatively low. Under the condition that the elastic force and wear resistance of the damping structure are certain, the service life of the rotating shaft can be prolonged. Moreover, in order to reserve enough torque loss margin, the designed initial damping torque is small, the initial opening and closing force between the two components is small, and the user experience is better.

In a possible implementation manner of the first aspect, the transmission ratio i ₁₂ of the transmission structure is 1/4.

In a possible implementation of the first aspect, the transmission structure includes a ring gear, a sun gear, a planetary gear, and a planet carrier; wherein, the ring gear forms a rotation input end of the transmission structure, and the ring gear can rotate around its central axis. It is rotatably connected to the fixed bracket; the central gear is located in the inner gear and coaxially arranged with the inner gear; the planetary gear is located between the central gear and the inner gear, and the planetary gear meshes with the inner gear and the central gear; the central gear is fixed On the planetary carrier, the planetary gear is rotatably connected to the planetary carrier around its central axis, and the planetary carrier forms the rotation output end of the transmission structure. In this way, the transmission structure is a planetary gear transmission structure, the structure stability of the planetary gear transmission structure is better, and the rotation axis of the rotation input end and the rotation axis of the rotation output end are collinear, and the volume is small, which is conducive to the miniaturized design of the rotating shaft.

In a possible implementation manner of the first aspect, the number of planetary gears is multiple, the multiple planetary gears are evenly arranged around the circumference of the sun gear, and each planetary gear in the multiple planetary gears is connected to the ring gear , the central gear meshes. In this way, the stability of the planetary gear transmission structure is better.

In a possible implementation manner of the first aspect, the number of planetary gears is three. In this way, the number of planetary gears is moderate, and stability and structural complexity can be considered.

In a possible implementation manner of the first aspect, the transmission structure includes a driving gear and a driven gear; the driving gear forms a rotation input end of the transmission structure, and the driving gear is rotatably connected to the fixed bracket around its central axis; the driven gear Meshing with the driving gear, the diameter of the driven gear is smaller than that of the driving gear, that is, the number of teeth of the driven gear is less than that of the driving gear, and the transmission ratio i ₁₂ of the transmission structure is less than 1. The driven gear forms the rotational output end of the transmission structure. The transmission structure has a simple structure, fewer components, and is easy to assemble and operate.

In a possible implementation manner of the first aspect, both the driving gear and the driven gear are spur gears, and the axis of the driving gear is parallel to the axis of the driven gear. It is suitable for the scenario where the rotation axis of the rotation input end of the transmission structure is parallel to the rotation axis of the rotation output end of the transmission structure.

In a possible implementation manner of the first aspect, both the driving gear and the driven gear are bevel gears, and the axis of the driving gear intersects the axis of the driven gear. It is suitable for the scenario where the rotation axis of the rotation input end of the transmission structure intersects with the rotation axis of the rotation output end of the transmission structure. "Intersection" as used herein includes, but is not limited to, "perpendicular."

In a possible implementation manner of the first aspect, the fixing bracket includes a bracket body, a first connection ear and a second connection ear; the first connection ear and the second connection ear are fixed on the bracket body, and the first connection ear is provided with There is a first through hole, and the shaft core is fitted through the first through hole and can rotate in the first through hole; the rotation input end of the transmission structure can be rotatably connected to the second connecting ear. The structure is simple, and the stability of the transmission structure is better.

In a possible implementation manner of the first aspect, the first connecting ear includes a connecting ear body and a fixing member; the connecting ear body is fixed on the bracket body, and the first through hole is provided on the connecting ear body; A gap is provided on one side, the gap extends along the radial direction of the first through hole, and the gap penetrates part of the connecting ear body located on one side of the first through hole; the fixing piece is fixed on the connecting ear body, and the fixing piece is provided with a limiter A position block, the limit block is matched and installed in the notch. When assembling the rotating shaft, the notch allows the shaft core to be installed into the first through hole along the radial direction of the first through hole, thereby reducing the difficulty of installing the shaft core in the first through hole.

In a possible implementation manner of the first aspect, the connecting ear body is further provided with a limiting hole, and the axial direction of the limiting hole is parallel to the axial direction of the first through hole. The fixing piece is also provided with a limit post, which is matched and penetrated in the limit hole. Therefore, in addition to the notch and the limiting block, the fixing member and the connecting ear body are limited by the limiting hole and the limiting column, thereby preventing the fixing member from being in contact with the first through hole. Axial vertical in-plane motion (including translational and rotational motion). Further, the connecting ear body, the fixing piece and the damping structure are arranged along the axial direction of the first through hole, and the fixing piece is located between the connecting ear body and the damping structure. The damping structure has a pressing force directed towards the connecting ear body, so as to press the fixing piece on the connecting ear body. In this way, the freedom of movement of the fixing member relative to the connecting ear body along the axial direction of the first through hole is limited by the damping structure. Thus, the fixing of the fixing member on the connecting ear body is realized. In this way, complicated fixing operations such as screw connection and welding are not performed between the fixing piece and the connecting ear body, and the installation and disassembly operations are simple and easy to implement.

In a possible implementation manner of the first aspect, the transmission structure and the damping structure are located on opposite sides of the first connecting ear, respectively, and the damping structure includes friction plates, torsion springs, and nuts arranged in sequence along a direction away from the transmission structure; friction The sheet and the torsion spring are sleeved on the shaft core, the shaft core is fixed with a screw rod, the screw rod and the shaft core are coaxially arranged, and the nut is screwed on the screw rod. By rotating the nut, the torsion spring can be compressed, and further damping torque is provided to the first connecting lug through the friction plate, thereby preventing the shaft core from rotating relative to the first connecting lug, so that the two parts connected by the rotating shaft can be kept at the target Opening and closing angle position. Wherein, the target opening and closing angle position may be any angle position between 0° and 360°. The structure of the rotating shaft is simple, and by rotating the nut, the magnitude of the initial damping torque provided by the damping structure can be adjusted. Therefore, it can meet the needs of different damping scenarios, so it has a wide range of applications, and can keep the two components connected by the rotating shaft at any opening and closing angle position.

In a second aspect, some embodiments of the present application provide a device equipped with a rotating shaft, the device including two components and the rotating shaft as described in any of the above technical solutions; a fixing bracket of the rotating shaft is fixed to one of the two components , the movable bracket of the rotating shaft is fixed with the other part of the two parts.

Since the device provided in the embodiment of the present application includes the rotating shaft described in any of the above technical solutions, the two can solve the same technical problem and achieve the same technical effect.

In a third aspect, some embodiments of the present application provide a device equipped with a rotating shaft, the device includes a keyboard host, a display screen and the rotating shaft as described in any of the above technical solutions; the fixing bracket of the rotating shaft is fixed with the keyboard host, and the rotating shaft is The movable bracket is fixed with the display screen.

Description of drawings

1 is a schematic structural diagram of a device provided with a rotating shaft provided by some embodiments of the present application;

Fig. 2 is the structural representation of the part shown in area I in the equipment shown in Fig. 1;

FIG. 3 is a schematic structural diagram of a device provided with a rotating shaft provided by further embodiments of the present application;

Fig. 4 is an enlarged view of area II in the apparatus shown in Fig. 3;

5 is a perspective view of a rotating shaft provided by some embodiments of the present application;

Fig. 6 is the exploded view of the rotating shaft shown in Fig. 5;

7 is a schematic structural diagram of a rotating shaft provided by further embodiments of the present application;

8 is a schematic structural diagram of a rotating shaft provided by further embodiments of the present application;

FIG. 9 is a graph showing the relationship between the known wear amount and displacement and load at present;

FIG. 10 is a perspective view of a rotating shaft provided by further embodiments of the present application;

Fig. 11 is an exploded view of the rotating shaft shown in Fig. 10;

12 is a schematic structural diagram of a rotating shaft provided by further embodiments of the present application;

FIG. 13 is an exploded view of the rotating shaft shown in FIG. 12 .

Detailed ways

In the embodiments of the present application, the terms "first", "second" and "third" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", "third" may expressly or implicitly include one or more of that feature.

In the embodiments of the present application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also Include other elements not expressly listed, or which are inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The present application provides a device equipped with a rotating shaft, which includes but is not limited to electronic devices such as mobile phones, notebook computers, laptop computers (laptop computers), personal digital assistants (PDAs), personal computers, and in-vehicle devices. As well as accessories for these electronic devices (such as phone stands, tablet stands, selfie sticks, protective cases, etc.).

Please refer to FIGS. 1 and 2 . FIG. 1 is a schematic structural diagram of a device 100 provided with a rotating shaft provided by some embodiments of the present application, and FIG. 2 is a structural schematic diagram of the part shown in area I of the device 100 shown in FIG. 1 . In this embodiment, the device 100 with the rotating shaft installed is a notebook computer. Specifically, the device 100 includes a keyboard host 10 , a display screen 20 and a rotating shaft 30 . It should be noted that FIGS. 1 and 2 only schematically show some components included in the device 100 , and the actual shapes, actual sizes, actual positions and actual structures of these components are not limited by FIGS. 1 and 2 . Moreover, it can be understood that, in addition to the keyboard host 10, the display screen 20 and the rotating shaft 30, the device 100 may also include other components, such as a camera module, etc., which are not specifically limited herein.

In the above embodiment, the keyboard host 10 is used for inputting instructions and data, and controls the display screen 20 to display images and videos according to the inputted instructions and data.

The display screen 20 is used to display images, videos, and the like. The display screen 20 can be a flexible display screen or a rigid display screen. For example, the display screen 20 can be an organic light-emitting diode (organic light-emitting diode, OLED) display screen, an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED) Display, mini organic light-emitting diode (mini organic light-emitting diode) display, micro light-emitting diode (micro organic light-emitting diode) display, micro organic light-emitting diode (micro organic light-emitting diode) display, quantum dot light-emitting diode (quantum dot light emitting diodes, QLED) display, liquid crystal display (liquid crystal display, LCD).

The rotating shaft 30 is used to rotatably connect the keyboard host 10 and the display screen 20, so that the device 100 can be switched between an open state and a closed state. When the device 100 is in an open state, the display screen 20 and the keyboard host 10 form an included angle greater than 0° and less than 360°. And the rotating shaft 30 has a damping effect, so that the device 100 can maintain the target opening angle position between 0° and 360°. The target opening angle may be a fixed value between 0° and 360°, or may be any value between 0° and 360°. When the device 100 is turned on, the user can control the display screen 20 to display through the keyboard host 10 , and at the same time, the user can also watch the images or videos displayed on the display screen 20 . When the device 100 is in the closed state, the display screen 20 is covered on the keyboard host 10 , and the display surface of the display screen 20 is opposite to the keyboard surface of the keyboard host 10 . When the device 100 is in a closed state, the display interface of the display screen 20 and the keyboard surface of the keyboard host 10 can be protected from scratches and dust.

Please refer to FIGS. 3 and 4 . FIG. 3 is a schematic structural diagram of a device 100 provided with a rotating shaft according to further embodiments of the present application, and FIG. 4 is an enlarged view of area II in the device 100 shown in FIG. 3 . In this embodiment, the device 100 on which the rotating shaft is installed is a mobile phone or tablet computer stand. Specifically, the device 100 includes a base body 40 , a carrier 50 and a rotating shaft 30 . It should be noted that FIGS. 3 and 4 only schematically show some components included in the device 100 , and the actual shapes, actual sizes, actual positions and actual structures of these components are not limited by FIGS. 3 and 4 . Meanwhile, it can be understood that the device 100 may include other structures besides the base 40, the carrier 50 and the rotating shaft 30, such as being electrically connected by a universal serial bus (USB), a charging coil and a charging chip The formed wireless charging circuit and the like are not specifically limited here.

In the above-mentioned embodiment, the base body 40 is used to be fixed on a computer desk, a wall, a center console of a car, etc. by means of gluing, clamping, screw connection, and fixing with a magic sticker. The carrier 50 is used to carry a mobile phone or a tablet computer. The carrier 50 is provided with a fixing portion 51 . The fixing part 51 is used for fixing the mobile phone or the tablet computer on the carrier 50 . Specifically, the fixing portion 51 includes, but is not limited to, a buckle, a suction cup, and the like. The rotating shaft 30 connects the carrier 50 to the base 40 rotatably, and the rotating shaft 30 has a damping effect, so that the carrier 50 can stagnate at the target opening and closing angle position after driving the mobile phone or tablet computer to rotate.

It should be noted that FIGS. 1-4 only schematically show two structural forms of the device 100, and the structural form of the device 100 is not limited to this, as long as it includes two components and is connected between the two components A type of equipment such as the rotating shaft 30 is within the scope of protection of the present application.

In the device 100 described in any of the above embodiments, the rotating shaft 30 has various structural forms. Please refer to FIGS. 5 and 6 , FIG. 5 is a perspective view of a rotating shaft 30 provided by some embodiments of the present application, and FIG. 6 is an exploded view of the rotating shaft 30 shown in FIG. 5 . In this embodiment, the rotating shaft 30 includes a fixed bracket 31 , a shaft core 32 , a damping structure 33 and a movable bracket 34 . It should be noted that, FIGS. 5 and 6 only schematically show some components included in the rotating shaft 30 , and the actual shapes, actual sizes, actual positions and actual structures of these components are not limited by FIGS. 5 and 6 . Meanwhile, it can be understood that the rotating shaft 30 may include other structures besides the fixed bracket 31 , the shaft core 32 , the damping structure 33 and the movable bracket 34 , which are not specifically limited herein.

The materials of the fixed bracket 31 and the movable bracket 34 include but are not limited to cold rolled steel and stainless steel. The fixed bracket 31 and the movable bracket 34 are respectively used for fixing with the two components of the device 100 .

For example, when the rotating shaft 30 is applied to the notebook computer shown in FIG. 1 and FIG. 2 , in some embodiments, the fixed bracket 31 is fixed to the keyboard host 10 , and the movable bracket 34 is fixed to the display screen 20 . It can be understood that the fixed bracket 31 can also be fixed to the display screen 20 , and at this time, the movable bracket 34 is fixed to the keyboard host 10 .

As another example, when the rotating shaft 30 is applied to the mobile phone or tablet computer bracket shown in FIGS. 3 and 4 , in some embodiments, the fixed bracket 31 is fixed to the base 40 , and the movable bracket 34 is fixed to the carrier 50 . It can be understood that the fixed bracket 31 can also be fixed to the carrier 50 , and at this time, the movable bracket 34 is fixed to the base body 40 .

In order to realize the fixing of the fixing bracket 31 and a component of the device 100 , in some embodiments, please refer to FIG. 6 , the fixing bracket 31 is provided with a first fixing hole 31 a. The first fixing hole 31a is used for fixing with a component of the device 100 by means of screws, bolts, rivets and the like. In some embodiments, the number of the first fixing holes 31a is multiple. For example, the number of the first fixing holes 31a is three.

In order to improve the installation efficiency of the fixing bracket 31 on a component of the device 100, in some embodiments, please continue to refer to FIG. 6, the fixing bracket 31 is further provided with a first positioning hole 31b. The first positioning hole 31b is used to cooperate with a positioning column (not shown in the figure) on a component of the device 100, so as to realize the pre-positioning of the fixing bracket 31 on the component. As a result, the installation efficiency of the fixing bracket 31 on a component of the device 100 can be improved. In some embodiments, the number of the first positioning holes 31b is multiple. For example, the number of the first positioning holes 31b is two.

In order to realize the fixation between the movable bracket 34 and another component of the device 100, in some embodiments, please refer to FIG. 6, the movable bracket 34 is provided with a second fixing hole 34a. The second fixing holes 34a are used for fixing with another component of the device 100 by means of screws, bolts, rivets and the like. In some embodiments, the number of the second fixing holes 34a is multiple. For example, the number of the second fixing holes 34a is two.

In order to improve the installation efficiency of the movable bracket 34 on another component of the device 100, in some embodiments, please continue to refer to FIG. 6, the movable bracket 34 is further provided with a second positioning hole 34b. The second positioning hole 34b is used to cooperate with a positioning column (not shown in the figure) on another part of the device 100, so as to realize the pre-positioning of the movable bracket 34 on the other part. As a result, the installation efficiency of the movable bracket 34 on another part of the apparatus 100 can be improved. In some embodiments, the number of the second positioning holes 34b is multiple. For example, the number of the second positioning holes 34b is two.

The shaft core 32 is the core component of the rotating shaft 30 and has a columnar structure. The material of the shaft core 32 includes but is not limited to 45 gauge steel, 40 chrome and 42 chrome molybdenum and the like. The shaft core 32 is rotatably connected to the fixed bracket 31 with itself as an axis. In some embodiments, the fixing bracket 31 includes a bracket body 311 and a first connecting ear 312 . The first connecting ear 312 is fixed on the bracket body 311 . The first connecting ear 312 is provided with a first through hole. The shaft core 32 is fitted through the first through hole and can rotate in the first through hole.

In the above embodiment, the first connecting ear 312 may be an integral structure, or may be formed by assembling a plurality of structures, which is not specifically limited herein.

In some embodiments, the first connecting ear 312 includes a connecting ear body 3121 and a fixing member 3122 . The connecting ear body 3121 is fixed on the bracket body 311 . Specifically, the connection ear body 3121 may be fixed on the bracket body 311 by means of screw connection, snap connection, integral molding, etc., which is not specifically limited herein. In some embodiments, the connecting ear body 3121 and the bracket body 311 are integrally formed. The first through hole is disposed on the connecting ear body 3121, and a notch 3121a is formed on one side of the first through hole. The notch 3121a extends along the radial direction of the first through hole, and the notch 3121a penetrates a part of the connecting ear body 3121 located on one side of the first through hole. The notches 3121a allow the shaft core 32 to be installed into the first through hole along the radial direction of the first through hole, so as to reduce the difficulty of installing the shaft core 32 in the first through hole. The fixing member 3122 is fixed on the connecting ear body 3121 . The fixing member 3122 is provided with a limiting block 3122a, and the limiting block 3122a is fitted in the notch 3121a. In this way, the limiting block 3122a and the connecting ear body 3121 enclose a closed first through hole to prevent the shaft core 32 from coming out of the first through hole along the radial direction of the first through hole.

In the above embodiment, the connection method between the fixing member 3122 and the connecting ear body 3121 includes, but is not limited to, screw connection, welding and snap connection, which are not specifically limited herein.

In some embodiments, please continue to refer to FIG. 6 , the connecting ear body 3121 is further provided with a limiting hole 3121b, and the axial direction of the limiting hole 3121b is parallel to the axial direction of the first through hole. The fixing member 3122 is also provided with a limiting column 3122b, and the limiting column 3122b is fitted through the limiting hole 3121b. Therefore, in addition to the gap 3121a and the limiting block 3122a, the space between the fixing member 3122 and the connecting ear body 3121 is limited by the limiting hole 3121b and the limiting post 3122b, so that the fixing member 3122 can be blocked. Movement (including translational movement and rotational movement) in a plane perpendicular to the axial direction of the first through hole. Further, the connecting ear body 3121 , the fixing piece 3122 , and the damping structure 33 are arranged along the axial direction of the first through hole, and the fixing piece 3122 is located between the connecting ear body 3121 and the damping structure 33 . The damping structure 33 has a pressing force directed toward the connecting ear body 3121 to press the fixing member 3122 on the connecting ear body 3121 . In this way, the freedom of movement of the fixing member 3122 relative to the connecting ear body 3121 in the axial direction of the first through hole is restricted by the damping structure 33 . Thus, the fixing of the fixing member 3122 on the connecting ear body 3121 is realized. In this way, the fixing member 3122 and the connecting ear body 3121 are not subjected to complicated fixing operations such as screw connection, welding, etc., and the installation and removal operations are simple and easy to implement.

In the above-mentioned embodiment, it can be understood that the limiting hole 3121b may also be provided on the fixing member 3122, and at this time, the limiting post 3122b is provided on the connecting ear body 3121.

In some embodiments, please continue to refer to FIG. 6 , the fixing bracket 31 further includes a third connecting lug 314 , a third through hole is formed on the third connecting lug 314 , the third through hole is coaxial with the first through hole, and the shaft The core 32 also passes through the third through hole. In this way, the shaft core 32 is jointly supported by the first connection lugs 312 and the third connection lugs 314 , which can improve the supporting stability of the shaft core 32 on the fixing bracket 31 .

The movable bracket 34 is fixed on the shaft core 32 . In some embodiments, please refer to FIG. 6 , the movable bracket 34 is fixed on the part of the shaft core 32 located between the first connection ear 312 and the third connection ear 314 . It can be understood that, the movable bracket 34 can also be fixed on other parts of the shaft core 32, which is not limited herein. Specifically, the movable bracket 34 may be fixed on the shaft core 32 by means of screw connection, riveting, integral molding, etc., which is not specifically limited herein. In some embodiments, the movable bracket 34 is integrally formed with the shaft core 32 . In this way, the rotating shaft 30 includes fewer components, which is beneficial to reduce the structural complexity of the rotating shaft 30 and improve the assembly efficiency of the rotating shaft 30 .

When the shaft core 32 rotates relative to the fixed bracket 31 with itself as the axis, the movable bracket 34 can be driven to rotate relative to the fixed bracket 31 .

The damping structure 33 is used to provide damping torque, so that the two components connected with the rotating shaft 30 can be maintained at the target opening and closing angle position. There are various structural forms of the damping structure 33. Specifically, the damping structure 33 includes the following three structural forms:

The first structural form: please refer to FIG. 7 , which is a schematic structural diagram of the rotating shaft 30 according to further embodiments of the present application. In this embodiment, the first connecting ear 312 is an elastic bushing with an elastic gap 312a. The inner hole of the first connecting lug 312 (that is, the first through hole mentioned above) is a variable diameter inner hole with inconsistent radii along the circumferential direction. The shaft core 32 is a cam structure with inconsistent radii along the axial direction. When the shaft core 32 rotates to the target position in the first through hole, the first connecting lugs 312 apply an elastic clamping force to the shaft core 32 and generate damping torque to prevent the shaft core 32 from rotating, so that the rotating shaft 30 is connected to The two parts of the can be maintained at the target opening and closing angle position. The target opening and closing angular position may be one or more angular positions between 0° and 360°. In this embodiment, the shaft core 32 and the first connecting lugs 312 form the damping structure 33. The rotating shaft 30 has a simple structure and low cost, and can keep the two parts connected to the rotating shaft 30 between 0° and 360°. One or more opening and closing angular positions between.

The second structural form: please refer to FIG. 8 , which is a schematic structural diagram of the rotating shaft 30 provided by still other embodiments of the present application. In this embodiment, the damping structure 33 is an elastic material disposed between the shaft core 32 and the inner wall of the first through hole. The elastic material includes, but is not limited to, rubber, sponge, and the like. The elastic material is compressed to apply elastic gripping force to the shaft core 32 and generate damping torque to prevent the shaft core 32 from rotating, so that the two components connected by the rotating shaft 30 can be maintained at the target opening and closing angle position. Wherein, the target opening and closing angle position may be any angle position between 0° and 360°. The rotating shaft has a simple structure and low cost, and can keep the two components connected with the rotating shaft 30 at any opening and closing angle position.

The third structural form: please refer to FIG. 5 and FIG. 6 , the damping structure 33 and the movable bracket 34 are respectively located on opposite sides of the first connecting ear 312 . The damping structure 33 includes a friction plate 331, a torsion spring 332, and a nut 333 which are arranged in sequence along the direction away from the first connecting ear 312. The friction plate 331 and the torsion spring 332 are sleeved on the shaft core 32 . A screw 32 a is fixed on the shaft core 32 , and the screw 32 a is coaxial with the shaft core 32 . The nut 333 is threadedly connected to the screw rod 32a. By rotating the nut 333 , the torsion spring 332 can be compressed, and further damping torque is provided to the first connecting lug 312 through the friction plate 331 , thereby preventing the shaft core 32 from rotating relative to the first connecting lug 312 , so that the shaft 30 is connected to the first connecting lug 312 . Both parts can be held at the target opening and closing angular position. Wherein, the target opening and closing angle position may be any angle position between 0° and 360°. The structure of the rotating shaft is simple, and by rotating the nut 333, the magnitude of the initial damping torque provided by the damping structure 33 can be adjusted. Therefore, the requirements of different damping scenarios can be met, so the scope of application is wide, and the two components connected with the rotating shaft 30 can be maintained at any opening and closing angle positions.

In the rotating shaft 30 described in any of the above embodiments, the movable bracket 34 is used as a torque input component, and it is assumed that its input torque under its own weight and load (that is, the gravity of the components connected to the movable bracket 34 ) is T1 . Since the movable bracket 34 is fixed on the shaft core 32, the damping torque T' provided by the damping structure 33 needs to overcome the input torque T1. Specifically, the damping torque T' is opposite to the input torque T1 and has the same magnitude. Therefore, the damping torque T' that the damping structure 33 needs to provide is relatively large. Further, the damping torque T' is proportional to the pressure F exerted by the damping structure 33 on the friction surface. For example, in the embodiments shown in FIGS. 5 and 6 , the damping torque T′=k*F*d. Wherein, k represents the torque coefficient; F represents the pressure exerted by the damping structure 33 on the fixing member 3122 through the friction plate 331 ; d represents the diameter of the friction surface (ie, the contact surface between the friction plate 331 and the fixing member 3122 ). From this, it can be seen that the damping torque T' is proportional to the pressure F exerted by the damping structure 33 on the friction surface. The greater the damping torque T′, the greater the pressure F exerted by the damping structure 33 on the friction surface, the greater the elastic force required by the elastic structure (such as the torsion spring 332 ) in the damping structure 33, and the higher the elastic force requirement of the elastic structure. Further, according to the theoretical formula of adhesive wear: wear volume V=α*FL/(3H). Among them, α represents the wear coefficient, F represents the pressure applied by the damping structure 33 to the friction surface, L represents the sliding distance of the friction part, and H represents the material hardness of the friction part. Under the premise that the wear resistance of the friction part is constant, that is, α and H are constant, the wear volume V of the friction part of the damping structure 33 and the pressure F applied by the damping structure 33 to the friction surface and the sliding of the friction part The distance L is proportional. Please refer to FIG. 9. FIG. 9 shows the known wear amount (that is, the wear volume V), displacement (that is, the sliding distance L) and load (that is, the pressure F applied by the damping structure 33 to the friction surface). ) relationship graph. It can be seen from Fig. 9 that in the adhesive wear stage, with the increase of load and displacement, the wear amount increases, and compared with the displacement, the load increases, and the wear amount increases faster. And when the load ≥ H/3, the wear amount increases sharply. As the displacement increases, the amount of wear remains the same. From this, it can be seen that the load has a greater influence on the wear amount than the displacement. Therefore, the greater the pressure F exerted by the damping structure 33 on the friction surface, the greater the wear amount of the friction part. The friction parts are prone to wear failure, the damping torque decays quickly, and the shaft life is short. In order to prolong the service life of the rotating shaft, there is a higher requirement on the wear resistance of the material of the damping structure 33, and at this time, the cost of the damping structure 33 is high. Moreover, in order to reserve a sufficient torque loss margin, the designed initial damping torque is large, resulting in a large initial opening and closing force between the two components, thereby affecting the user experience.

In order to solve the above problems, please refer to FIGS. 10 and 11 . FIG. 10 is a perspective view of a rotating shaft 30 according to further embodiments of the present application, and FIG. 11 is an exploded view of the rotating shaft 30 shown in FIG. 10 . In this embodiment, the rotating shaft 30 includes a transmission structure 35 in addition to a fixed bracket 31 , a shaft core 32 , a damping structure 33 and a movable bracket 34 .

The transmission structure 35 is serially connected between the shaft core 32 and the movable bracket 34 . Specifically, the transmission structure 35 has a rotational input end and a rotational output end. The rotation output end of the transmission structure 35 is fixed coaxially with the shaft core 32 . That is to say, the rotation output end of the transmission structure 35 is fixed to the shaft core 32 , and the rotation axis of the rotation output end of the transmission structure 35 is collinear with the axis of the shaft core 32 . The rotation input end of the transmission structure 35 is fixed with the movable bracket 34 . The transmission ratio i ₁₂ of the transmission structure 35 is less than one. The transmission ratio _i12 refers to the ratio of the rotational speed r1 of the rotational input end of the transmission structure 35 to the rotational speed r2 of the rotational output end of the transmission structure 35 during the operation of the transmission structure 35: r1/r2. Specifically, i ₁₂ may specifically be 1/2, 1/4, 1/8, and so on. In some embodiments, i ₁₂ is 1/4.

In this embodiment, a transmission structure 35 is added to the rotating shaft 30, and the transmission ratio i12 _of the transmission structure 35 is less than 1. The movable bracket 34 is used as a torque input component, assuming that its input torque under its own weight and load (that is, the gravity of the components connected to the movable bracket 34) is T1, then the output torque of the transmission structure 35 is T2, T2=T1 *i ₁₂ *η. η represents the transmission efficiency of the transmission, and η is less than or equal to 1. Since i ₁₂ is less than 1, the output torque T2 of the transmission structure 35 is smaller than the input torque T1 of the transmission structure 35 . It can be seen from this that the damping structure 33 only needs to provide the damping torque T′ to overcome the output torque T2 of the transmission structure 35 . Specifically, the damping torque T' and the output torque T2 are opposite in direction and equal in magnitude. Since the damping torque T' is proportional to the pressure F exerted by the damping structure 33 on the friction surface, the pressure F exerted by the damping structure 33 on the friction surface is relatively small. Under the condition of ensuring a certain service life of the rotating shaft, the requirements for the elastic force and wear resistance of the damping structure 33 are relatively low. Under the condition that the elastic force and wear resistance of the damping structure 33 are constant, the service life of the rotating shaft can be prolonged. Moreover, in order to reserve enough torque loss margin, the designed initial damping torque is small, the initial opening and closing force between the two components is small, and the user experience is better.

In the above embodiment, the transmission structure 35 has various structural forms. Specifically, the transmission structure 35 includes, but is not limited to, a gear transmission structure, a pulley transmission structure, a sprocket transmission structure, and the like. In some embodiments, the transmission structure 35 is a gear transmission structure. The gear transmission structure has high transmission precision and compact structure, which is beneficial to the miniaturized design of the rotating shaft 30 .

On this basis, in some embodiments, please refer to FIG. 11 , the transmission structure 35 includes a ring gear 351 , a sun gear 352 , a planetary gear 353 and a planetary carrier 354 . The ring gear 351 forms the rotation input end of the transmission structure 35 . The ring gear 351 is rotatably connected to the fixed bracket 31 around its central axis. In some embodiments, please continue to refer to FIG. 11 , the fixing bracket 31 further includes a second connection ear 313 , the second connection ear 313 is fixed on the bracket body 311 , and the inner gear 351 is rotatably connected to the second connection around its central axis. ear 313. Specifically, the second connecting lug 313 is provided with a second through hole, and the inner gear 351 is rotatably connected to the second through hole through the rotating shaft structure. The central gear 352 is located in the ring gear 351 and coaxially arranged with the ring gear 351 . The planetary gear 353 is located between the sun gear 352 and the ring gear 351 , and the planetary gear 353 meshes with the ring gear 351 and the sun gear 352 . The sun gear 352 is fixed on the planetary carrier 354 , the planetary gear 353 is rotatably connected to the planetary carrier 354 around its central axis, and the planetary carrier 354 forms the rotation output end of the transmission structure 35 . In this way, the transmission structure 35 is a planetary gear transmission structure, the transmission ratio i ₁₂ of the transmission structure 35 = the number of teeth Z ₃ of the sun gear 352 / the number of teeth Z ₁ of the ring gear 351 , the planetary gear transmission structure has better structural stability, and the rotation The rotation axis of the input end is collinear with the rotation axis of the rotation output end, and the volume is small, which is beneficial to the miniaturized design of the rotating shaft.

Wherein, the number of planetary gears 353 may be one or more, which is not specifically limited herein. In some embodiments, the number of planetary gears 353 is plural. Specifically, the number of planetary gears 353 includes, but is not limited to, 2, 3, 4, and the like. The plurality of planetary gears 353 are evenly arranged around the circumference of the sun gear 352 , and each of the plurality of planetary gears 353 meshes with the ring gear 351 and the sun gear 352 . In this way, the stability of the planetary gear transmission structure is better.

In the above embodiment, the number of planetary gears 353 is three. In this way, the number of planetary gears 353 is moderate, and stability and structural complexity can be considered.

In still other embodiments, please refer to FIG. 12 and FIG. 13 , FIG. 12 is a schematic structural diagram of the rotating shaft 30 provided by further embodiments of the present application, and FIG. 13 is an exploded view of the rotating shaft 30 shown in FIG. 12 . In this embodiment, the transmission structure 35 includes a driving gear 355 and a driven gear 356 .

The driving gear 355 forms the rotation input end of the transmission structure 35 , and the driving gear 355 is rotatably connected to the fixed bracket 31 around its central axis. In some embodiments, the driving gear 355 is rotatably connected to the second connecting ear 313 around its central axis. In some embodiments, the number of the second connecting ears 313 is two, and the driving gear 355 is rotatably connected to the two second connecting ears 313 around its central axis.

The driven gear 356 meshes with the driving gear 355, and the diameter of the driven gear 356 is smaller than the diameter of the driving gear 355, that is to say, the number of teeth Z ₂ of the driven gear 356 is less than the number of teeth Z ₁ of the driving gear 355, and the transmission of the transmission structure 35 The ratio i ₁₂ =Z ₂ /Z ₁ , therefore, i ₁₂ is less than 1. The driven gear 356 forms the rotational output of the transmission structure 35 . The transmission structure 35 has a simple structure, fewer components, and is easy to assemble and operate.

In the above embodiment, the driving gear 355 and the driven gear 356 may be spur gears or bevel gears, which are not specifically limited herein.

In some embodiments, please continue to refer to FIG. 13 , the driving gear 355 and the driven gear 356 are both spur gears. In this case, the axis of the driving gear 355 is parallel to the axis of the driven gear 356 . It is applicable to the scenario where the rotation axis of the rotation input end of the transmission structure 35 is parallel to the rotation axis of the rotation output end of the transmission structure 35 .

In other embodiments, the driving gear 355 and the driven gear 356 are both bevel gears, which are not shown in the figures of this embodiment, and the axis of the driving gear 355 intersects the axis of the driven gear 356 . It is applicable to the scenario where the rotation axis of the rotation input end of the transmission structure 35 intersects with the rotation axis of the rotation output end of the transmission structure 35 . It should be noted that the "intersection" here includes, but is not limited to, "perpendicular".

It can be known that the transmission structure 35 is not limited to the above-mentioned planetary gear structure and two-stage gear transmission structure, and can also be a three-stage or even more than three-stage gear transmission structure, which is not specifically limited here.

In the description of this specification, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

A rotating shaft (30), characterized in that it comprises a fixed bracket (31), a shaft core (32), a damping structure (33), a transmission structure (35) and a movable bracket (34);

The shaft core (32) is rotatably connected to the fixing bracket (31) with itself as the axis, and the damping structure (33) is used to provide damping torque, so that the two shafts (30) connected to the shaft (30) are rotatably connected. The part can be kept at the target opening and closing angle position;

The transmission structure (35) has a rotation input end and a rotation output end, the rotation output end of the transmission structure (35) is coaxially fixed with the shaft core (32), and the rotation input end of the transmission structure (35) Fixed with the movable bracket (34), the transmission ratio of the transmission structure (35) is less than 1.
The rotating shaft (30) according to claim 1, wherein the transmission structure (35) comprises an inner gear (351), a sun gear (352), a planetary gear (353) and a planet carrier (354);

The inner gear (351) forms a rotation input end of the transmission structure (35), and the inner gear (351) is rotatably connected to the fixed bracket (31) around its central axis;

the central gear (352) is located in the inner gear (351) and is coaxially arranged with the inner gear (351);

The planetary gear (353) is located between the sun gear (352) and the ring gear (351), and the planetary gear (353) is connected to the ring gear (351) and the sun gear ( 352) engaging;

The sun gear (352) is fixed on the planet carrier (354), the planet gear (353) is rotatably connected to the planet carrier (354) around its central axis, and the planet carrier (354) forms The rotation output end of the transmission structure (35).
The rotating shaft (30) according to claim 2, characterized in that the number of the planetary gears (353) is plural, and the plurality of the planetary gears (353) are uniform in the circumferential direction around the sun gear (352). are arranged, and each of the plurality of planetary gears (353) meshes with the ring gear (351) and the sun gear (352).
The rotating shaft (30) according to claim 3, wherein the number of the planetary gears (353) is three.
The rotating shaft (30) according to claim 1, wherein the transmission structure (35) comprises a driving gear (355) and a driven gear (356);

The driving gear (355) forms a rotation input end of the transmission structure (35), and the driving gear (355) is rotatably connected to the fixing bracket (31) around its central axis;

The driven gear (356) meshes with the driving gear (355), the diameter of the driven gear (356) is smaller than the diameter of the driving gear (355), and the driven gear (356) forms the The rotation output end of the transmission structure (35).
The rotating shaft (30) according to claim 5, characterized in that both the driving gear (355) and the driven gear (356) are spur gears, and the axis of the driving gear (355) is aligned with the driven gear (355). The axes of the moving gear (356) are parallel.
The rotating shaft (30) according to claim 5, characterized in that both the driving gear (355) and the driven gear (356) are bevel gears, and the axis of the driving gear (355) is the same as the driven gear (355). The axes of the moving gear (356) intersect.
The rotating shaft (30) according to claim 1, wherein the fixing bracket (31) comprises a bracket body (311), a first connecting ear (312) and a second connecting ear (313);

The first connecting lug (312) and the second connecting lug (313) are fixed on the bracket body (311), the first connecting lug (312) is provided with a first through hole, and the shaft The core (32) is fitted through the first through hole and can rotate in the first through hole;

The rotation input end of the transmission structure (35) is rotatably connected to the second connection ear (313).
The rotating shaft (30) according to claim 8, wherein the first connecting ear (312) comprises a connecting ear body (3121) and a fixing member (3122);

The connecting ear body (3121) is fixed on the bracket body (311), and the first through hole is arranged on the connecting ear body (3121); one side of the first through hole is provided with a gap ( 3121a), the gap (3121a) extends along the radial direction of the first through hole, and the gap (3121a) penetrates a part of the connecting ear body (3121) on one side of the first through hole;

The fixing piece (3122) is fixed on the connecting ear body (3121), and a limiting block (3122a) is arranged on the fixing piece (3122), and the limiting block (3122a) is fitted in the notch (3121a).
The rotating shaft (30) according to claim 8 or 9, characterized in that, the transmission structure (35) and the damping structure (33) are respectively located on opposite sides of the first connecting ear (312), so The damping structure (33) includes a friction plate (331), a torsion spring (332), and a nut (333) arranged in sequence along a direction away from the transmission structure (35);

The friction plate (331) and the torsion spring (332) are sleeved on the shaft core (32), a screw rod (32a) is fixed on the shaft core (32), and the screw rod (32a) is connected to the shaft core (32). The shaft core (32) is coaxially arranged, and the nut (333) is threadedly connected to the screw rod (32a).
A device (100) equipped with a rotating shaft (30), characterized in that it comprises two components and the rotating shaft (30) according to any one of claims 1-10;

The fixed bracket (31) of the rotating shaft (30) is fixed to one of the two components, and the movable bracket (34) of the rotating shaft (30) is fixed to the other of the two components.
A device (100) equipped with a rotating shaft (30), characterized in that it comprises a keyboard host (10), a display screen (20) and the rotating shaft (30) according to any one of claims 1-10;

The fixed bracket (31) of the rotating shaft (30) is fixed with the keyboard host (10), and the movable support (34) of the rotating shaft (30) is fixed with the display screen (20).