A rotating shaft mechanism and electronic device
By employing a swing arm mating part and an undulating mating surface design in the folding screen hinge mechanism, and utilizing the cooperation of pin and cam structure, the problem of large hinge space occupation is solved, enabling a thinner or narrower hinge design and an optimized tactile experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HONOR DEVICE CO LTD
- Filing Date
- 2022-04-08
- Publication Date
- 2026-07-14
AI Technical Summary
In existing folding screen hinge mechanisms, the damping device is located on the hinge, which makes the hinge design complex and occupies a lot of space, making it difficult to achieve a thinner or narrower design.
The design incorporates the mating parts of the first and second swing arms and the undulating mating surface. The damping device is installed on the swing arm, and the undulating mating surface is formed by the end face of the slide groove. The pin, cam structure, and spring work together to achieve reverse resistance or positive assist function, saving shaft space.
It enables the design of more damping mechanisms within the same space, optimizes the feel, provides the function of hovering at any angle during rotation, simplifies the design of the pivot, and saves pivot space.
Smart Images
Figure CN116498641B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic products, and in particular to a rotating shaft mechanism and an electronic device. Background Technology
[0002] Currently, foldable screen hinge mechanisms incorporate damping devices. Specifically, a spring is added to the hinge shaft, with cam sliders fixed to both ends of the spring. The inner swing arm on the hinge shaft also features a cam mechanism. During rotation, the cam sliders of the cam mechanism press against each other to create the required damping. This damping, located at the hinge shaft, makes the hinge design more challenging. Summary of the Invention
[0003] This application provides a rotating shaft mechanism, including a first swing arm, a second swing arm, and a rotating shaft base. The first swing arm rotates relative to the rotating shaft base about a first axis, and the second swing arm rotates relative to the rotating shaft base about a second axis. The first axis and the second axis are parallel and offset. One of the first swing arm and the second swing arm is provided with a pin, and the other is provided with a groove that slides with the pin. When the first swing arm and the second swing arm rotate relative to the rotating shaft base, the pin slides relative to the groove, and the first swing arm and the second swing arm translate. One of the first swing arm and the second swing arm is provided with a mating part, and the other is provided with an undulating mating surface that extends and undulates along the direction of translation. The mating part and the undulating mating surface are elastically pressed together. The groove that restricts the relative rotation of the first and second swing arms is set in the second or first swing arm. It is equivalent to a part of the second or first swing arm being hollow, which does not occupy other space of the first or second swing arm and shares the thickness space, thereby saving thickness. Moreover, as the mating part and undulating mating surface of the damping device are set in the swing arm, there is no need to set it on the rotating shaft of the rotating shaft mechanism, which can save the space of the rotating shaft and facilitate the design of the rotating shaft. The rotating shaft can be designed to be thinner or narrower.
[0004] In this embodiment, since the first and second swing arms are provided with matching mating parts and undulating mating surfaces, it can be seen from the motion and force analysis that the function of applying reverse resistance or positive assistance during folding / unfolding can be realized. At the same time, the damping device is designed on the swing arm, which can save the space of the pivot mechanism, or more damping mechanisms can be designed in the same space, further optimizing the feel and providing the function of hovering at any angle during rotation.
[0005] Based on this aspect, the embodiments of this application provide a first implementation method:
[0006] The slide groove includes two sidewalls extending along the direction of translation, and the end faces of both sidewalls form the undulating mating surface. By utilizing the undulating mating surface formed on the end faces of the slide groove, no separate surface is needed, thus making full use of space. Furthermore, the fact that both sidewalls form undulating mating surfaces facilitates smooth sliding.
[0007] Based on the first implementation method, this application provides a second implementation method:
[0008] The mating part is located on the pin. This arrangement of the mating part onto the pin helps save space.
[0009] Based on the second implementation method, this application provides a third implementation method:
[0010] The pin is fixed or axially limited to the first or second swing arm, and the mating part is slidably connected to the pin along the pressing direction; or, the mating part is fixed or axially limited to the pin, and the pin can move relative to the groove along the pressing direction. When the pin is fixed or axially limited, the sliding connection of the mating part allows for changes in elastic compression when sliding with the undulating mating surface, thus altering the force. When the pin is fixed or axially limited, the pin can move, similarly achieving changes in elastic compression. Both of these structural configurations relatively simply achieve changes in the force exerted by the mating part against the undulating mating surface during translation.
[0011] Based on the third implementation method, this application provides a fourth implementation method:
[0012] The mating part has a through hole, through which the pin passes. The pin has a first planar portion; the wall of the through hole has a second planar portion, and / or the side wall of the groove has a third planar portion. The first planar portion, the second planar portion, and the third planar portion slide in engagement. The engagement of the planar portions restricts the rotation of the pin and the mating part relative to the groove, thereby ensuring that the mating part slides more smoothly and reliably relative to the undulating mating surfaces.
[0013] Based on any of the second to fourth embodiments of one aspect, this application provides a fifth embodiment of one aspect:
[0014] The mating part includes a pressing part and a spring. The pin is inserted into or passes through the spring, and the spring presses against the pressing part so that the pressing part presses against the undulating mating surface. The pressing part presses against the undulating mating surface, and the spring provides elastic force, thus satisfying both the performance requirements of pressing and elastic force.
[0015] Based on any of the second to fourth embodiments of one aspect, this application provides a sixth embodiment of one aspect:
[0016] The mating part is further provided with a protrusion that inserts into the slide groove and is able to slide along the slide groove. The protrusion inserted into the slide groove helps to restrict the rotation of the mating part relative to the slide groove.
[0017] Based on the sixth implementation method, this application provides a seventh implementation method:
[0018] The mating part has protrusions on both sides along the direction of translation. The presence of protrusions on both sides ensures more even force distribution and guidance.
[0019] Based on the seventh implementation method, this application provides an eighth implementation method:
[0020] The groove sidewall has a third planar portion, and the protrusion has a fourth planar portion, with the third and fourth planar portions slidingly engaged. This planar engagement is more conducive to limiting relative rotation between the engaging portions and the groove.
[0021] Based on this aspect, the embodiments of this application provide a ninth implementation method:
[0022] The mating part includes a pressing part that abuts against the undulating mating surface. The pressing part is a cam structure with an arc surface for pressing against the undulating mating surface. The arc surface pressing against the undulating mating surface facilitates smoother and more secure relative sliding between the two surfaces.
[0023] Based on one aspect, and any one of the first to ninth embodiments of one aspect, this application provides a tenth embodiment of one aspect:
[0024] The mating parts and the undulating mating surfaces are symmetrically distributed along the translational midline of the second swing arm. This symmetrical arrangement ensures balanced force distribution on the second swing arm relative to the first swing arm during translation, thus improving the user experience.
[0025] Based on the tenth implementation method, this application provides an eleventh implementation method:
[0026] The pin is disposed on the first swing arm; the second swing arm includes a first sidewall and a second sidewall arranged at intervals, both the first sidewall and the second sidewall having through grooves, the through grooves being the sliding grooves; the pin simultaneously passes through the sliding grooves of the first sidewall and the second sidewall, or, the rotating shaft mechanism includes two pins, the two pins respectively passing through the sliding grooves of the first sidewall and the second sidewall. The pins are inserted into the first sidewall and the second sidewall, resulting in relatively smooth sliding.
[0027] Based on the eleventh implementation method, this application provides a twelfth implementation method:
[0028] The rotating shaft mechanism also includes a connector that connects the two pins. The two pins facilitate assembly, and the connector improves the reliability of the connection between the two pins.
[0029] Based on the eleventh or twelfth implementation method of one aspect, the embodiments of this application provide a thirteenth implementation method of one aspect:
[0030] Both the groove on the first sidewall and the groove on the second sidewall include two groove sidewalls extending along the direction of translation. The inner end faces of the groove sidewalls of the two grooves respectively form the undulating mating surfaces. The rotating shaft mechanism has two mating parts, corresponding to the undulating mating surfaces of the two grooves respectively. The mating parts are located on the pin and between the first sidewall and the second sidewall. The mating parts are located between the first sidewall and the second sidewall, which can make full use of the space of the first swing arm and make the structure more compact.
[0031] Based on the thirteenth implementation method, this application provides a fourteenth implementation method:
[0032] The mating part includes a pressing part and a spring pressing against the pressing part. The springs of the two mating parts are integrally formed, and the two pressing parts are respectively located at both ends of the spring.
[0033] The pin simultaneously penetrates the first sidewall, the second sidewall, the spring, and the two abutment portions; or, the rotating shaft mechanism includes two pins, one pin penetrating the first sidewall, one abutment portion, and inserting into the spring from one end, and the other pin penetrating the second sidewall, another abutment portion, and inserting into the spring from the other end. The two abutment portions are located at both ends of the spring, resulting in a simple structure; assembling with one or two pins is relatively straightforward.
[0034] Based on the eleventh implementation method, this application provides a fifteenth implementation method:
[0035] The first swing arm has a notch or a groove, or the first swing arm includes a first split swing arm and a second split swing arm, with a gap between them forming a space; at least a portion of the second swing arm is located in the notch, the groove, or the space, and the pin is connected to, fixed to, or integrally formed with the sidewall of the notch, the groove, or the space. The second swing arm being located in the notch or groove facilitates full utilization of space and reduces the width of the rotating shaft mechanism; the space between the first and second split swing arms further facilitates the narrowing of the rotating shaft mechanism.
[0036] Based on the fifteenth embodiment of one aspect, the present application provides a sixteenth embodiment of one aspect:
[0037] The sidewall of the notch, the groove, or the space is provided with a pin hole, and the pin is inserted into the pin hole to connect with the first swing arm. The pin is inserted into the pin hole for axial limiting connection, which is simple.
[0038] Based on one aspect, and any one of the first to sixteenth embodiments of one aspect, this application provides a seventeenth embodiment of one aspect:
[0039] The undulating mating surface includes a first segment, a second segment, and a third segment connected sequentially along the direction of translation. Compared to the second segment, the first segment and the third segment are recessed in a direction away from the mating portion they mate with. This design provides resistance in the early stages of the folding or unfolding process, assistance towards the end of the folding or unfolding process, and a hovering function in the middle of the process, thus providing a better feel.
[0040] Based on one aspect, and any one of the first to sixteenth embodiments of one aspect, this application provides an eighteenth embodiment of one aspect:
[0041] At least one set of first swing arms and second swing arms are provided on both sides of the pivot base; the set of first swing arms and second swing arms on one side and the set of first swing arms and second swing arms on the other side are symmetrically arranged along the central axis of the pivot base. The symmetrical arrangement is conducive to achieving smooth and synchronous rotation of the two side frames.
[0042] Based on one aspect, and any one of the first to sixteenth embodiments of one aspect, this application provides an eighteenth embodiment of one aspect:
[0043] The pin is parallel to the first axis and the second axis. This parallel arrangement ensures smoother sliding and more even force distribution relative to the sliding groove.
[0044] Secondly, embodiments of this application also provide an electronic device, including a flexible folding screen and a pivot mechanism as described in any of the above claims, and further including a middle frame located on both sides of the pivot mechanism, wherein the flexible folding screen is supported on the middle frames on both sides; the first swing arm is fixedly or integrally or limitedly connected to the middle frame, and the first swing arm drives the middle frame to rotate when it rotates. Attached Figure Description
[0045] Figure 1 This is a schematic diagram of an electronic device in the first embodiment of this application, with the electronic device in an unfolded state;
[0046] Figure 2 for Figure 1 A schematic diagram of the folding process of electronic devices in China;
[0047] Figure 3 for Figure 1 Enlarged view of the position of the rotating shaft mechanism;
[0048] Figure 4 for Figure 3 Enlarged view of the positions of the first and second swing arms, which are symmetrically arranged in the middle;
[0049] Figure 5 for Figure 2 Exploded view of the connection between the first and second swing arms;
[0050] Figure 6 for Figure 5 Schematic diagram of the middle cam;
[0051] Figure 7 for Figure 4 A schematic diagram of the pressure between the cam and the undulating mating surface;
[0052] Figures 8a-8h for Figure 2 A schematic diagram of the folding process of the central pivot mechanism;
[0053] Figure 9 for Figure 2 Schematic diagram of the force analysis principle of the central shaft mechanism in the initial stage of unfolding or folding;
[0054] Figure 10 for Figure 2 Schematic diagram of the force analysis principle of the central pivot mechanism in a suspended state during the unfolding or folding process;
[0055] Figure 11 for Figure 2 A schematic diagram illustrating the force analysis principle of the central pivot mechanism at the final stage of its unfolding or folding process.
[0056] Figure 12 for Figure 4 A transverse sectional view of the position where the middle pin is inserted into the second swing arm, i.e., a view taken along the direction of translation;
[0057] Figure 13 This is a schematic diagram of the positions of the two symmetrically arranged first swing arms of the rotating shaft mechanism in the second embodiment of this application;
[0058] Figure 14 for Figure 2 Schematic diagram of the connection principle of the first swing arm, second swing arm, pin, cam structure and spring of the central pivot mechanism;
[0059] Figure 15This is a schematic diagram showing the connection principle of the first swing arm, second swing arm, pin, cam structure and spring of the rotating shaft mechanism in the third embodiment of this application.
[0060] Figure 16 This is a schematic diagram showing the connection principle of the first swing arm, second swing arm, pin, cam structure and spring of the rotating shaft mechanism in the fourth embodiment of this application. Specific Implementation
[0061] This application provides an electronic device, exemplarily a mobile phone. The electronic device includes a flexible folding screen, a mid-frame 1, and a hinge mechanism 2. Mid-frames 1 are provided on both sides of the hinge mechanism 2. The flexible folding screen is supported on and connected to the mid-frames 1 on both sides. The mid-frames 1 on both sides can rotate around the hinge mechanism 2, so the flexible folding screen can be rotated and folded or opened through the hinge mechanism 2.
[0062] like Figure 1-3 As shown, the rotating shaft mechanism 2 includes a rotating shaft and a first swing arm 21 and a second swing arm 22. The rotating shaft includes a rotating shaft base 23. A set of first swing arms 21 and second swing arms 22 are located on the same side of the rotating shaft base 23. Each side of the rotating shaft base 23 is provided with at least one set of first swing arms 21 and second swing arms 22. The first swing arms 21 and second swing arms 22 on both sides of the rotating shaft base 23 are symmetrically arranged along the center line X of the rotating shaft base 23. The rotation axes of the first swing arms 21 and second swing arms 22 are parallel to the center line X of the rotating shaft base 23. The distance between the center line X and the rotation axes of the first swing arms 21 on both sides is equal, and the distance between the center line X and the rotation axes of the two second swing arms 22 on both sides is also equal. That is, the first swing arms 21 and second swing arms 22 are symmetrically arranged on the left and right sides relative to the rotating shaft base 23. Figure 1 Two sets of first swing arms 21 and second swing arms 22 are respectively provided on both sides of the central pivot base 23. The longer the pivot mechanism 2 is, the more sets of swing arms can be provided.
[0063] The first swing arm 21 rotates relative to the pivot base 23 around a first axis. The middle frame 1 of the phone is limited, fixed, or integrally connected to the first swing arm 21. Thus, when the first swing arm 21 rotates, it can drive the middle frame 1 to rotate around the pivot base 23. Specifically, the first swing arm 21 can rotate around a first rotation axis, which is the axis of the first rotation axis. Figure 3 In the first swing arm 21, a rotating connector 211 is provided, which serves as the first rotating shaft. Alternatively, a shaft passing through the rotating connector 211 can also be used as the first rotating shaft. This allows the first swing arm 21 to rotate relative to the rotating shaft base 23 around the first rotating shaft. Figure 3 As shown.
[0064] The second swing arm 22 rotates relative to the pivot base 23 around the second axis, specifically around the second rotation axis 24. Figure 3As shown. The first axis and the second axis are parallel but offset from each other. Furthermore, the first swing arm 21 and the second swing arm 22 are connected by a pin 25, preventing them from rotating relative to each other. Thus, when both the first swing arm 21 and the second swing arm 22 rotate relative to the rotating shaft base 23, due to the offset of the first and second axes and the constraint of the pin 25, there is no rotational freedom between the first swing arm 21 and the second swing arm 22, resulting in relative translational motion. It can be understood that, to achieve this purpose, the connection between the pin 25 and the first swing arm 21 is not limited to a pin-hole 21c limiting connection; it can also be fixed to the first swing arm 21, integrally set, etc. Here, a plug-in connection is used for ease of assembly. From Figure 4-5 As can be seen, the second swing arm 22 is provided with a sliding groove 22b, and the first swing arm 21 is provided with a pin hole 21c. The pin 25 is inserted into the pin hole 21c and is axially limited and connected to the first swing arm 21. The pin 25 is also inserted into the sliding groove 22b. While the first swing arm 21 and the second swing arm 22 are relatively translating, the pin 25 slides relative to the sliding groove 22b. The extension direction of the sliding groove 22b is perpendicular to the first axis and the second axis. The pin 25 and the first axis and the second axis can be arranged in parallel. The extension direction of the sliding groove 22b is perpendicular to the extension direction of the pin 25.
[0065] like Figures 8a-8h As shown, the shaft cover 3 located below the rotating shaft mechanism 2 is also illustrated, covering the bottom of the rotating shaft mechanism 2. During the folding process of the flexible display screen, the first swing arm 21 and the second swing arm 22 gradually move away from each other through relative translation, which is also the process of the pin 25 sliding along the slide groove 22b. The sliding direction is the same as the translation direction, and the pin 25 moves from one end of the slide groove 22b near the second axis to the opposite end. When the flexible display screen is opened, the pin 25 moves in the opposite direction. The relative movement process is as follows:
[0066] Figure 8a , 8b This diagram illustrates the states of the first swing arm 21, the second swing arm 22, and the pivot base 23 when the flexible display screen (not shown) is fully extended. Figure 8a , 8b From the perspective of the second swing arm 22, and by comparing the positional relationship between the left-side pin 25 and the slide 22c, the pin 25 is located at the far right of the slide 22b of the second swing arm 22.
[0067] Figure 8c , 8d This diagram illustrates the states of the first swing arm 21, the second swing arm 22, and the pivot base 23 when the flexible display screen (not shown) is fully unfolded and folded at a certain angle. Compared to... Figure 8b The pin 25 slides to the left relative to the slide groove 22b, and is roughly in the middle of the slide groove 22b.
[0068] Figure 8e , 8f The flexible display screen (not shown in the picture) is illustrated in... Figure 8c , Figure 8d The state of the first swing arm 21, the second swing arm 22, and the pivot base 23 after further folding. Compared to Figure 8d The pin 25 continues to slide to the left relative to the slide 22b, approaching the leftmost position of the slide 22b.
[0069] Figure 8g , 8h The flexible display screen (not shown in the picture) is illustrated in... Figure 8e , Figure 8f The state of the first swing arm 21, the second swing arm 22, and the pivot base 23 when further folded to a fully folded state. Compared to Figure 8f The pin 25 continues to slide to the left relative to the slide groove 22b until it reaches the leftmost position of the slide groove 22b.
[0070] In the folding and unfolding action of the hinge mechanism 2 of the foldable display, from the perspective of user experience, an important indicator is the damping of the hinge mechanism 2. The feel during the rotation process plays a very important role in the user experience, so the hinge mechanism 2 needs to provide damping during the folding and unfolding process.
[0071] Therefore, in this embodiment of the application, the rotating shaft mechanism 2 includes a damping device, which includes a mating part and an undulating mating surface 22a. One of the mating part and the undulating mating surface 22a is disposed on the first swing arm 21, and the other is disposed on the second swing arm 22. The mating part can elastically press against the undulating mating surface 22a. Figure 5 As shown, the damping device includes a cam structure 26 (or defined as a protrusion) and a spring 27. The second swing arm 22 is provided with a cam engagement part, which is specifically the end face of the slide groove 22b. This end face can be defined as a cam engagement surface or an undulating engagement surface 22a. The undulating engagement surface 22a extends and undulates along the translational and sliding directions. Taking any plane perpendicular to the first axis and the second axis as a reference plane, at least a part of the undulating engagement surface 22a is at a different distance from the reference plane than another part of its position along the translational direction. Thus, when the engagement part and the undulating engagement surface 22a slide relative to each other along the translational direction, the elastic pressing force of the engagement part will change.
[0072] Figure 5 In the middle, the slide 22b has two groove sidewalls that are arranged opposite to each other and extend along the sliding direction. Figure 8bThe second swing arm 22 specifically includes a first sidewall 221 and a second sidewall 222 extending in the direction of translation. Both the first sidewall 221 and the second sidewall 222 are provided with sliding grooves 22b. The inner end face of the sidewall of the sliding groove 22b forms an undulating mating surface 22a. Here, "inner" refers to the opposite side of the two sliding grooves 22b, and vice versa. It can be seen that since the sliding groove 22b has two sidewalls, the end faces of both sidewalls form undulating mating surfaces 22a. Figure 6 As shown, the cam structure 26 provided on the pin 25 has mating surfaces that mate with the undulating mating surfaces 22a of the upper and lower slot sidewalls, respectively. These mating surfaces are arc surfaces 261a, hence the definition of cam structure 26. More specifically, the mating surfaces of the cam structure 26 are as follows: Figure 7 The shape shown has a semi-circular outline, which can better abut against the undulating mating surface 22a and contact the undulating mating surface 22a of the corresponding side sliding groove 22b at the tangent point of the mating surface, so that the force is evenly distributed, and at the same time, it is conducive to smooth sliding and avoids jamming and other situations. Figure 5 In the cam structure 26, a through hole 26a is provided, and a pin 25 passes through the through hole 26a, such as... Figure 6 As shown, with the through hole 26a as the boundary, the end of the cam structure 26 facing the undulating mating surface 22a is divided into two cam structures 261. The end face of each cam structure 261 is an arc surface 261a, which respectively mates with the undulating mating surfaces 22a of the two groove sidewalls.
[0073] It is understood that, based on the need for pressure resistance, the mating part is not limited to the cam structure 26; any pressure-resistant part capable of pressing against the undulating mating surface 22a is acceptable. Furthermore, the force of the spring 27 is used to provide the pressure against the undulating mating surface 22a. Therefore, it is not limited to using a spring 27; for example, the mating part itself could be an elastic body, which can both contact and press against the undulating mating surface 22a, and its own elasticity allows it to elastically press against the undulating mating surface 22a. Of course, the mating part includes the spring 27 providing the elastic force and the pressure-resistant part (specifically the cam structure 26) for contacting and pressing against the undulating mating surface 22a, facilitating a balance between elasticity and contact pressure performance requirements. For example, the pressure-resistant part can be made of plastic or metal, better adapting to the pressure against and sliding against the undulating mating surface 22a.
[0074] Please continue to combine Figure 4 , 5 As understood in 8a, after assembly, the pin 25 is inserted into the cam structure 26 and the spring 27. The spring 27 is located between the two cam structures 26 and has a pre-compression amount to ensure that the arc surfaces 261a of the two cam structures 26 always press against the undulating mating surfaces 22a of the first side wall 221 and the second side wall 222, respectively. Figure 7The undulating mating surface 22a includes a first segment a1, a second segment a2, and a third segment a3 connected sequentially along the translational direction. The first segment a1 is closest to the second rotation axis 24, and the third segment a3 is furthest from the second rotation axis 24. The first segment a1 and the third segment a3 are recessed relative to the second segment a2 in a direction away from the cam structure 26, thus creating an undulating change. The second segment a2 can be parallel to the translational direction. Here, the pin 25 is inserted into the first rocker arm 21, so the mating part is indirectly provided in the first rocker arm 21.
[0075] by Figure 4 The principle of the relative motion process between the cam structure 26 and the undulating mating surface 22a at the lower right end is illustrated. Figure 9 As shown, during rotation, when the first swing arm 21 and the second swing arm 22 produce relative translational motion, the cam structure 26 first presses against the first segment a1 of the mating surface of the cam structure 26. The first segment a1 will push the cam structure 26, and the spring 27 will be further compressed. According to mechanical analysis, the reaction force generated by the compression of the spring 27 is transmitted to the undulating mating surface 22a of the cam structure 26 and the slide groove 22b, generating interacting forces Fup and Fdown perpendicular to the contact surface of the two. Fup will... Figure 9 The diagram shows a horizontal component force Fup-horizion and a vertical component force Fup-vertical, respectively. The horizontal component force Fup-horizion is parallel to the driving force Ff during the folding / unfolding process and will generate a torque on the rotating shaft. Depending on the contact angle of the cam structure 26, the direction of this component force Fup-horizion may be opposite to the direction of rotation, i.e., opposite to the direction of the driving force Ff, thus generating rotational resistance; or it may be in the same direction as the rotation, i.e., in the same direction as the driving force Ff, thus generating rotational assistance. Figure 9 In the middle, the direction of Fup-horizion is opposite to the direction of the driving force Ff. This component force is a resistance force, which makes the rotation have a certain damping force and produces a damping-like feel. Figure 11 In the middle, the direction of Fup-horizon is the same as the direction of the driving force Ff. This component force provides positive assistance, making the rotation relatively smooth, and the feel is also relatively smooth. Furthermore, when rotating to certain angles, when the cam structure 26 and the planar portion of the undulating mating surface are opposite each other, because there is no horizontal component force, and no external force is applied by the user, a hovering function can be achieved due to the frictional resistance of the overall rotating shaft mechanism 2. Figure 10 As shown.
[0076] Combination Figures 8a-8h as well as Figure 9-11 Understanding is that, starting from the fully unfolded state or starting from the fully folded state, the cam structure 26 engages with the first segment a1 or the third segment a3 of the undulating mating surface 22a, i.e. Figure 9The force state shown generates resistance, while during unfolding or folding, no resistance or assistance is generated, allowing it to hover. Figure 10 The stress state shown; however, when it is about to be fully folded during the folding process, or about to be fully unfolded during the unfolding process, it will exhibit a different state. Figure 11 The force state shown is designed to generate assistance. This perfectly matches the appropriate feel required by the user during the unfolding or folding process: the torque is relatively large in the first half of the unfolding / folding process, with a certain damping force; the torque is smaller in the second half, and even in the final short closing phase, a force or torque in the same direction as the human hand is generated, producing a light and smooth feel. Moreover, during rotation, except for a small initial and final angle range, it can achieve stable hovering at any angle, without unfolding or folding without force. As can be seen from the above description of the feel requirements, the damping device design provided in this application embodiment can achieve this feel requirement.
[0077] In this embodiment, the first segment a1 and the third segment a3 of the undulating mating surface 22a are slopes inclined relative to the translational direction, the second segment a2 is a plane parallel to the translational direction, and the arc surface 261a facilitates sliding along the undulating mating surface 22a. It is understood that the undulating mating surface 22a is not limited to this configuration; for example, the undulating mating surface 22a can also include a curved surface, and the trend of the undulations can be consistent with... Figure 4 Keeping them the same, the first segment a1 and the second segment a3 are curved surfaces that are concave relative to the second segment a2. The specific undulation trend of the undulating mating surface 22a can be designed according to the actual feel requirements.
[0078] In addition, such as Figure 12 as well as Figure 5 As shown, the cam structure 26 has columnar protrusions 262 on both sides, which can extend into the slide groove 22b of the second swing arm 22 to further constrain the rotational freedom of the cam structure 26, ensuring a relative translational relationship between the cam structure 26 and the slide groove 22b, thus achieving consistent damping feel during each folding and unfolding process. Figure 12 As shown, the upper and lower sides of the protrusion 262 have a fourth planar portion 262a, and the slide groove 22b also has a planar portion. The inner wall surfaces of the upper and lower groove sidewalls of the slide groove 22b extending along the sliding direction are both third planar portions 22c. The third planar portion 22c and the fourth planar portion 262a cooperate, which can better ensure the relative translation of the undulating mating surface 22a of the cam structure 26 and the slide groove 22b.
[0079] You can watch it again. Figure 5The through hole 26a of the cam structure 26 has a second flat portion 263, and the pin 25 has a first flat portion 251. Specifically, the pin 25 can be configured as a D-shaped shaft, that is, the two sides of the pin 25 are flattened and the cross-section is D-shaped. After the protruding structure 26 and the pin 25 are inserted, it is not easy for them to rotate relative to each other. Moreover, at this time, the first flat portions 251 on both sides of the pin 25 can also cooperate with the third flat portion 22c of the groove sidewall of the slide groove 22b, which can constrain the pin 25 to rotate in the slide groove 22b, and can also ensure that the cam structure 26 can relatively stably press against the undulating mating surface 22a and translate.
[0080] Please see again Figure 4 In this embodiment of the application, since the slide 22b is installed on the second swing arm 22, it can be obtained from geometric knowledge (combined with...). Figures 8a-8h (Understanding) During the rotation from unfolding to folding, the groove 22b of the second swing arm 22 is in a state of distance from the first swing arm 21. Therefore, the space between the groove 22b and the spring 27 is not occupied. That is, in the unfolded state, the space enclosed by the first sidewall 221, the second sidewall 222, and the spring 27 of the second swing arm 22 is not needed. Setting other structures here will not interfere with the translational stroke of the first swing arm 21 relative to the second swing arm 22. In this embodiment, structures such as screw holes 21a can be provided in this space. Specifically, the first swing arm 21 extends into this space, and the extended portion can be machined with screw holes 21a. This provides sufficient space to set screw holes 21a so that the first swing arm 21 and the middle frame 1 can be connected by screws 21b, further maximizing space utilization.
[0081] Let's look again. Figure 13 The first swing arm 21 can be divided into upper and lower parts distributed along the axial direction, which can be defined as the first sub-swing arm 21-1 and the second sub-swing arm 21-2. The second swing arm 22 is axially positioned between the two parts of the first swing arm 21. The basic implementation principle is the same as the above scheme. However, since the width of the second swing arm 22 is limited by the stroke of the spring 27, the cam structure 26, and the slide 22b, it may become a bottleneck for narrowing the width of the rotating shaft mechanism 2. By cutting the first swing arm 21 into upper and lower parts along the axial direction, the structural part of the first swing arm 21 located outside the second swing arm 22 is completely eliminated. The width dimension at this position is determined by the second swing arm 22, which can further reduce the width of the rotating shaft mechanism 2, thus creating a benefit in width space. Correspondingly, under the premise that the width of the rotating shaft mechanism 2 occupies the same space, the stroke of the slide 22b or the size of the cam structure 26 and the spring 27 can be increased. From a processing perspective, the segmented arrangement of the first swing arm 21 can reduce the length dimension of the first swing arm 21, which is beneficial to improving its forming feasibility and reducing the overall contour tolerance, etc. At this time, if Figure 13 As shown, the second swing arm 22 has a rectangular frame structure, and the left and right ends of the first sidewall 221 and the second sidewall 222 are connected as one piece, which can provide better strength. Figure 4In this embodiment, the first swing arm 21 has a notch 21d facing the second swing arm 22, and a portion of the second swing arm 22 is accommodated in the notch 21d. In this case, the second swing arm 22 has a U-shaped structure, which is more conducive to meeting the width design requirements. The partial accommodation of the second swing arm 22 in the notch 21d also saves space. Figure 13 The benefits of occupancy in width are more pronounced. It can be seen that for... Figure 4 Alternatively, it is feasible to provide a groove with a bottom on the first swing arm 21 to accommodate part of the second swing arm 22, and to provide a notch 21d so that the second swing arm 22 has sufficient thickness and its translation is not easily interfered with.
[0082] like Figure 14 The above, Figure 3 The connection principle of the first swing arm 21, the second swing arm 22, and the damping device can be referred to Figure 14 Understanding: the cam structure 26 is sleeved on both ends of the pin 25, and the spring 27 is located between the two sides of the cam structure 26. Distinguished from... Figure 14 ,like Figure 15 As shown, the pin 25 may include two axial parts, or it can be understood as having two pins 25, each pin 25 integrally formed with a corresponding cam structure 26, that is, the cam structure 26 and the pin 25 are combined. Having two separate pins 25 also facilitates assembly. In this case, one pin 25 passes through the first sidewall 221 and inserts the spring 27 from one end, while the other pin 25 passes through the second sidewall 222 and inserts the spring 27 from the other end. Or as... Figure 16 As shown, the two pins 25 can be connected separately through the pin 25 connector, which makes assembly easier and also ensures the stability and reliability of the cam structure 26 during the pressing and translation process.
[0083] It should be noted that in the above embodiments, the mating parts (specifically, the cam structure 26 and the spring 27) are located on the pin 25. This utilizes the pin 25 to provide a mounting position for the mating parts, making full use of space and facilitating processing and assembly. The pin 25 primarily restricts the rotational freedom of the first swing arm 21 and the second swing arm 22. The mating parts can be located in other positions, as long as they can translate relative to the undulating mating surface 22a when the first swing arm 21 and the second swing arm 22 translate relative to each other. For example, the cam structure can be directly attached to the first swing arm 21. Based on understanding the function of the pin 25, it can be understood that setting the pin 25 parallel to the first and second axes is beneficial for uniform force distribution. However, the pin 25 does not necessarily have to be parallel to the first and second axes; some inclination is also acceptable. Of course, when the mating parts are located on the pin 25, setting the pin parallel to the first and second axes ensures consistent and uniform force distribution at both ends of the mating parts.
[0084] Furthermore, the above embodiment uses the example of the undulating mating surface 22a being located on the second swing arm 22 and the mating part being located on the first swing arm 21. It can be seen that the reverse arrangement is also possible, with the same principle. In this embodiment, the undulating mating surface 22a is located in the groove 22a of the second swing arm 22, which better utilizes space. In addition, the inner end faces of the upper and lower groove sidewalls of the groove 22b both form undulating mating surfaces 22a, thus the cam structure 26, serving as the pressing part, forms an upper and lower mating, resulting in a more stable fit. Here, "upper" and "lower" refer to... Figure 12 For reference, "up" and "down" are also along the thickness direction of the first swing arm 21 and the second swing arm 22. Furthermore, in this embodiment, mating parts and undulating mating surfaces 22a are symmetrically distributed along the translational centerline of the second swing arm 22, such as... Figure 4 As shown, both the first sidewall 221 and the second sidewall 222 of the second swing arm 22 form undulating mating surfaces 22a. Thus, along the translational direction, during translation, both sides of the second swing arm 22 are subjected to forces from the interaction of the undulating mating surfaces 22a and the mating parts, resulting in balanced forces. This helps ensure translational stability and improves the user experience. At this point, two sets of mating parts are provided. The springs in the two sets of mating parts can be set separately or as a single unit; that is, in this case, a single spring 27 is sufficient to simultaneously press against the cam structures 26 on both sides.
[0085] The above describes the structure and implementation principle of the damping device in the embodiments of this application. This damping device can also coexist with other damping schemes in the rotating shaft mechanism 2.
[0086] The above embodiments are mainly used to describe foldable screen mobile phones. It can be seen that the application is not limited to foldable screen mobile phones, but can also be other electronic devices. It is not only applicable to electronic devices with foldable screens, but can be used as long as the electronic device has the requirement of relative rotation. For example, the electronic device can be a laptop, as well as wearable devices, in-vehicle devices, augmented reality (AR) / virtual reality (VR) devices, ultra-mobile personal computers (UMPCs), netbooks, personal digital assistants (PDAs), and other mobile terminals. Alternatively, it can be professional shooting equipment such as digital cameras, SLR cameras / mirrorless cameras, action cameras, gimbal cameras, and drones.
[0087] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.
Claims
1. A rotating shaft mechanism, characterized in that, The device includes a first swing arm, a second swing arm, and a pivot base. The first swing arm rotates relative to the pivot base about a first axis, and the second swing arm rotates relative to the pivot base about a second axis. The first axis and the second axis are parallel and offset. One of the first swing arm and the second swing arm is provided with a pin, and the other is provided with a groove that slides with the pin. When the first swing arm and the second swing arm rotate relative to the pivot base, the pin slides relative to the groove, and the first swing arm and the second swing arm translate. One of the first swing arm and the second swing arm is provided with a mating part, and the other is provided with an undulating mating surface that extends and undulates along the direction of translation. The mating part and the undulating mating surface are elastically pressed together. The mating part is provided on the pin; the pin is fixed or axially limited to the first swing arm or the second swing arm, and the mating part is slidably connected to the pin along the pressing direction; or the mating part is fixed or axially limited to the pin, and the pin can move relative to the groove along the pressing direction.
2. The rotating shaft mechanism according to claim 1, characterized in that, The groove includes two groove sidewalls extending along the direction of translation, and the end faces of the two groove sidewalls form the undulating mating surface.
3. The rotating shaft mechanism according to claim 1, characterized in that, The mating part has a through hole, the pin passes through the through hole, and the pin has a first planar part; the hole wall of the through hole has a second planar part, and / or the groove sidewall of the slide has a third planar part, the first planar part, the second planar part, and the third planar part are in sliding fit.
4. The rotating shaft mechanism according to claim 3, characterized in that, The mating part includes a pressing part and a spring. The pin is inserted into or passes through the spring, and the spring presses against the pressing part so that the pressing part presses against the undulating mating surface.
5. The rotating shaft mechanism according to claim 3, characterized in that, The mating part is also provided with a protrusion, which is inserted into the slide groove and can slide along the slide groove.
6. The rotating shaft mechanism according to claim 5, characterized in that, The mating part is provided with protrusions on both sides along the direction of translation.
7. The rotating shaft mechanism according to claim 6, characterized in that, The groove sidewall has a third planar portion, and the protrusion has a fourth planar portion, with the third planar portion and the fourth planar portion slidingly engaged.
8. The rotating shaft mechanism according to claim 1, characterized in that, The mating part includes a pressing part that abuts against the undulating mating surface. The pressing part is a cam structure, and the cam structure has an arc surface for abutting against the undulating mating surface.
9. The rotating shaft mechanism according to any one of claims 1-8, characterized in that, The mating parts and the undulating mating surfaces are symmetrically distributed along the centerline of the translation of the second swing arm.
10. The rotating shaft mechanism according to claim 9, characterized in that, The pin is disposed on the first swing arm; the second swing arm includes a first side wall and a second side wall arranged at intervals, both the first side wall and the second side wall are provided with through grooves, the through grooves being the sliding grooves; the pin passes through the sliding grooves of the first side wall and the second side wall simultaneously, or the rotating shaft mechanism includes two pins, the two pins respectively passing through the sliding grooves of the first side wall and the second side wall.
11. The rotating shaft mechanism according to claim 10, characterized in that, The rotating shaft mechanism also includes a connector that connects the two pins.
12. The rotating shaft mechanism according to claim 10 or 11, characterized in that, The groove of the first sidewall and the groove of the second sidewall each include two groove sidewalls extending in the direction of translation, and the inner end faces of the groove sidewalls of the two grooves respectively form the undulating mating surfaces; the rotating shaft mechanism is provided with two mating parts, respectively corresponding to the undulating mating surfaces of the two grooves, and the mating parts are provided on the pin and located between the first sidewall and the second sidewall.
13. The rotating shaft mechanism according to claim 12, characterized in that, The mating part includes a pressing part and a spring pressing against the pressing part. The springs of the two mating parts are integrally formed, and the two pressing parts are respectively located at both ends of the spring. The pin passes through the first sidewall, the second sidewall, the spring, and the two pressing parts; or the rotating shaft mechanism includes two pins, one of which passes through the first sidewall, one of the pressing parts, and is inserted into the spring from one end, and the other pin passes through the second sidewall, the other of the pressing parts, and is inserted into the spring from the other end.
14. The rotating shaft mechanism according to claim 10, characterized in that, The first swing arm has a notch or a groove, or the first swing arm includes a first swing arm and a second swing arm, with a gap between them to form a space; at least a portion of the second swing arm is located in the notch, the groove, or the space, and the pin is connected to, fixed to, or integrally formed with the sidewall of the notch, the groove, or the space.
15. The rotating shaft mechanism according to claim 14, characterized in that, The side wall of the notch, the groove, or the space is provided with a pin hole, and the pin is inserted into the pin hole to connect with the first swing arm.
16. The rotating shaft mechanism according to any one of claims 1-8, characterized in that, The undulating mating surface includes a first segment, a second segment, and a third segment that are sequentially connected along the direction of translation. Compared to the second segment, the first segment and the third segment are recessed in a direction away from the mating portion they mate with.
17. The rotating shaft mechanism according to claim 16, characterized in that, The mating parts and the undulating mating surfaces are symmetrically distributed along the centerline of the translation of the second swing arm.
18. The rotating shaft mechanism according to claim 16, characterized in that, The pin is disposed on the first swing arm; the second swing arm includes a first side wall and a second side wall arranged at intervals, both the first side wall and the second side wall are provided with through grooves, the through grooves being the sliding grooves; the pin passes through the sliding grooves of the first side wall and the second side wall simultaneously, or the rotating shaft mechanism includes two pins, the two pins respectively passing through the sliding grooves of the first side wall and the second side wall.
19. The rotating shaft mechanism according to any one of claims 1-8, characterized in that, At least one set of first swing arms and second swing arms are provided on both sides of the rotating shaft base; the set of first swing arms and second swing arms on one side and the set of first swing arms and second swing arms on the other side are symmetrically arranged along the central axis of the rotating shaft base.
20. The rotating shaft mechanism according to claim 19, characterized in that, The mating parts and the undulating mating surfaces are symmetrically distributed along the centerline of the translation of the second swing arm.
21. The rotating shaft mechanism according to claim 19, characterized in that, The pin is disposed on the first swing arm; the second swing arm includes a first side wall and a second side wall arranged at intervals, both the first side wall and the second side wall are provided with through grooves, the through grooves being the sliding grooves; the pin passes through the sliding grooves of the first side wall and the second side wall simultaneously, or the rotating shaft mechanism includes two pins, the two pins respectively passing through the sliding grooves of the first side wall and the second side wall.
22. The rotating shaft mechanism according to any one of claims 1-8, characterized in that, The pin is parallel to the first axis and the second axis.
23. The rotating shaft mechanism according to claim 22, characterized in that, The mating parts and the undulating mating surfaces are symmetrically distributed along the centerline of the translation of the second swing arm.
24. The rotating shaft mechanism according to claim 22, characterized in that, The pin is disposed on the first swing arm; the second swing arm includes a first side wall and a second side wall arranged at intervals, both the first side wall and the second side wall are provided with through grooves, the through grooves being the sliding grooves; the pin passes through the sliding grooves of the first side wall and the second side wall simultaneously, or the rotating shaft mechanism includes two pins, the two pins respectively passing through the sliding grooves of the first side wall and the second side wall.
25. An electronic device, characterized in that, The device includes a flexible folding screen and a pivot mechanism as described in any one of claims 1-24, and further includes a middle frame located on both sides of the pivot mechanism, wherein the flexible folding screen is supported on the middle frames on both sides; the first swing arm is fixed, integral, or limitedly connected to the middle frame, and the first swing arm drives the middle frame to rotate when it rotates.