Friction damping type hinge assembly

Abstract

The utility model discloses a friction damping type hinge assembly which comprises a static hinge and a friction damping type hinge, the hinge shaft is fixed in the static hinge in a penetrating manner and is provided with a first threaded section and a second threaded section; the movable hinge is arranged on the hinge shaft in a sleeving manner and can rotate, and a convex seat in the middle of the movable hinge is arranged outside the hinge shaft in a sleeving manner and can rotate; the first damping module comprises a first friction plate, a second friction plate, a first spring and a first nut, the first friction plate and the second friction plate are arranged on the hinge shaft in a sleeving mode, the first nut is spirally fixed to the first threaded section and used for adjusting the compression amount of the first spring so as to adjust damping force between the first friction plate and the second friction plate, and the second friction plate is fixedly assembled with the boss; the second damping module comprises a third friction plate, a fourth friction plate, a second spring and a second nut, the third friction plate and the fourth friction plate are arranged on the hinge shaft in a sleeving mode, the second nut is spirally fixed to the second threaded section and used for adjusting the compression amount of the second spring to adjust damping force between the third friction plate and the fourth friction plate, and the third friction plate is fixedly assembled with the protruding base; and the fourth friction plate and the hinge shaft are circumferentially positioned so as to synchronously rotate or be fixed.

Description

Technical fields:

[0001] This utility model relates to the technical field of hinge products, and specifically to a friction-damped hinge assembly. Background technology:

[0002] Chinese utility model patent application number 202321525868.4 discloses a hovering hinge, which includes an upper bracket and a lower bracket. A pin mechanism is provided between the upper and lower brackets. The pin mechanism includes a first friction plate and a second friction plate. The first friction plate has a shaft groove, and a pin is disposed inside the shaft groove. The second friction plate is fixedly installed on the upper bracket. The upper bracket has a first shaft hole, and the lower bracket has a second shaft hole. This hovering hinge uses the first and second friction plates to surround and fix the pin to the outside, with axial contact, to achieve damping through the axial friction between them. However, the first and second friction plates are in rigid contact with the pin, and the first and second friction plates are locked on both sides by screws, resulting in only line contact between the first and second friction plates and the pin. This leads to a small contact area, i.e., a very small damping force. It is only suitable for hovering very light cover plates, and the damping durability is poor, making it prone to failure after long-term use. Furthermore, this structure requires a large amount of space, which is not conducive to miniaturization design, and since it is a fixed friction force, it does not meet the limit requirement of a larger force at a certain angle.

[0003] Furthermore, even with the aforementioned existing hovering hinges, their function is typically to allow the cover to hover at any angle. This means that the resistance of the hovering hinge is greater than the weight of the cover itself. When subjected to external vibration, the cover will still fall freely, failing to achieve true hovering and thus not meeting the requirements for hovering use. In many actual applications, the hovering hinge needs a limit function when it is opened to its maximum angle or a certain special angle. That is, when subjected to external force or vibration within a certain value, the cover should still remain in its original position, causing considerable inconvenience to the user.

[0004] In view of the above, the inventors propose the following technical solution. Utility Model Content:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a friction-damped hinge assembly.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a friction damping hinge assembly includes: a stationary hinge; a hinge shaft, which is fixedly inserted in the stationary hinge, and has a first threaded section and a second threaded section respectively at its lower and upper parts; a movable hinge, which is sleeved on the hinge shaft and can rotate relative to the hinge shaft, and the movable hinge also has a boss in the middle, which is sleeved outside the hinge shaft and can rotate; a first damping module, which includes a first friction plate and a second friction plate sleeved on the hinge shaft and in contact with each other, a first spring, and a first nut, the first nut being helically fixed on the first threaded section and The first friction plate and the second friction plate are adjusted by adjusting the compression of the first spring to adjust the damping force between them. The second friction plate is assembled with the lower end of the boss and cannot rotate relative to each other. The second damping module includes a third friction plate and a fourth friction plate sleeved on the hinge shaft and in contact with each other, a second spring, and a second nut. The second nut is screwed on the second threaded section and is used to adjust the compression of the second spring to adjust the damping force between the third friction plate and the fourth friction plate. The third friction plate is assembled with the upper end of the boss and cannot rotate relative to each other. The fourth friction plate is circumferentially positioned with the hinge shaft to rotate synchronously or be fixed.

[0007] Furthermore, in the above technical solution, the upper end of the third friction plate is formed with a first concave-convex wave surface distributed in an annular pattern; the lower end of the fourth friction plate is formed with a second concave-convex wave surface distributed in an annular pattern and adapted to the first concave-convex wave surface. When the convex surface in the first concave-convex wave surface gradually contacts the concave surface in the second concave-convex wave surface, and then the convex surface in the first concave-convex wave surface contacts the convex surface in the second concave-convex wave surface, the third friction plate and the fourth friction plate move away from each other to gradually compress the second spring and enhance the damping force between the third friction plate and the fourth friction plate and the oblique force that needs to be overcome when shifting gears, so as to provide an angle limiting function at a fixed position.

[0008] Furthermore, in the above technical solution, the cross-section of the middle part of the hinge shaft is polygonal to form a first polygonal segment, and the hole in the middle part of the fourth friction plate is a first polygonal hole. After the fourth friction plate is sleeved on the first polygonal segment in the middle part of the hinge shaft through the first polygonal hole, they can slide axially but cannot rotate circumferentially.

[0009] Furthermore, in the above technical solution, the hinge shaft is provided with a second polygonal segment at the lower part of the first threaded segment, and the hole at the lower part of the static hinge is the second polygonal hole. After the second polygonal segment passes through the second polygonal hole, it can slide axially but cannot rotate circumferentially.

[0010] Furthermore, in the above technical solution, an upper hinge bushing and a lower hinge bushing are respectively installed in the upper shaft hole and the lower shaft hole of the moving hinge. The boss is provided with a central shaft hole that passes through the upper and lower end faces. A slot is provided at the top of the hinge shaft. The top of the hinge shaft passes through the second polygonal hole at the bottom of the stationary hinge, the lower shaft hole, the central shaft hole of the boss, the upper hinge bushing, and the round hole at the top of the stationary hinge in sequence from bottom to top, and extends out of the upper end face of the stationary hinge. The snap ring is fixed in the slot and contacts the upper end face of the stationary hinge.

[0011] Furthermore, in the above technical solution, the upper and lower end faces of the first spring are both cut to form a first upper plane and a first lower plane, the first upper plane being in contact with the lower surface of the second friction plate; the hinge shaft is also fitted with a double-ear washer, the upper end face of the double-ear washer being in contact with the first lower plane, and the lower end face of the double-ear washer being in contact with the upper end face of the first nut; wherein, each of the double-ear washer has two outwardly protruding ears; the number of the first nuts is two, both of which are screwed and fixed on the first threaded section and are in contact with each other.

[0012] Furthermore, in the above technical solution, the upper and lower end faces of the second spring are both cut to form a second upper plane and a second lower plane, and the second lower plane contacts the upper surface of the fourth friction plate; the hinge shaft is also fitted with a first circular washer and a second circular washer, the upper end face of the first circular washer contacts the second upper plane, the upper end face of the first circular washer contacts the lower end face of the second nut, the upper end face of the second circular washer contacts the second lower plane, the lower end face of the second circular washer contacts the lower end face of the fourth friction plate, and there are two second nuts, both of which are screwed and fixed on the second threaded section and in contact with each other.

[0013] Furthermore, in the above technical solution, the upper end of the second friction plate is integrally formed with a plurality of upwardly protruding first limiting portions, and the periphery of the protrusion is provided with a plurality of first limiting grooves adapted to the first limiting portions. The first limiting portions pass through the first limiting grooves from bottom to top to form circumferential limiting, and the second friction plate and the protrusion can slide axially.

[0014] Furthermore, in the above technical solution, the lower end of the third friction plate is integrally formed with several downwardly protruding second limiting parts, and the periphery of the convex seat is provided with several second limiting grooves adapted to the second limiting parts. The second limiting parts pass through the second limiting grooves from top to bottom to form circumferential limiting, and the third friction plate and the convex seat can slide axially.

[0015] Furthermore, in the above technical solution, the hole at the center of the first friction plate is a circular hole, and a gap is formed between the circular hole and the outer periphery of the middle part of the hinge shaft, so that they can rotate relative to each other; or, the hole at the center of the first friction plate is a third polygonal hole, and after the first friction plate is sleeved on the first polygonal segment in the middle part of the hinge shaft through the third polygonal hole, they can slide axially but cannot rotate circumferentially.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0017] 1. This utility model does not have a separate rotary damper, but uses friction to generate damping force. The first and second damping modules are composed of nuts, springs, friction plates, etc., which are modular and compact, reducing the space required for hinge assembly installation. This is beneficial for applications in structures with high installation space requirements.

[0018] 2. The fourth friction plate and the third friction plate are in surface-to-surface contact with a large contact area, so that no sharp collisions or knocking noises will be produced when shaking or changing position. This utility model also uses a second spring to provide elastic force to the four friction plates, so that the fourth friction plate and the third friction plate are tightly attached together. The third friction plate is fixed to the moving hinge, and the fourth friction plate is fixed to the hinge shaft. This allows the moving hinge to drive the third and fourth friction plates to rotate stably when rotating, which well ensures the stability of the hinge assembly and can generate a very good damping force. At the same time, the moving hinge will drive the second friction plate to rotate relative to the first friction plate. The first spring and the first friction plate provide elastic force to drive the first friction plate and the second friction plate to be tightly attached together, so as to generate damping force through friction. This makes the moving hinge generate a sufficiently large damping force when rotating relative to the stationary hinge. It can be used for the suspension of very light or very heavy cover plates. Moreover, the damping force has good durability and is not easy to fail even after long-term use, ensuring product quality.

[0019] 3. This utility model can also adjust the damping force of the first damping module and the second damping module by tightening or loosening the first nut and the second nut respectively, so as to meet the same usage requirements; by tightening the first nut and the second nut, the first spring increases the elastic force to drive the first friction plate and the second friction plate to fit tightly together, and the second spring increases the elastic force to drive the third friction plate and the fourth friction plate to fit tightly together, thereby greatly enhancing the damping force. Among them, the first damping module can provide the cover plate with the damping force to suspend the cover plate. While providing the suspension damping force, the first damping module also realizes the function of limiting the angle of the cover plate.

[0020] 4. The utility model can also adjust the damping force of the first damping module and the second damping module by tightening or loosening the first nut and the second nut respectively, so that when the damping force is less than the weight of the cover plate itself, the cover plate can still fall slowly, thereby achieving the damping effect of buffering the fall and preventing the cover plate from being damaged or injured by excessive impact. Attached image description:

[0021] Figure 1 This is a perspective view of Embodiment 1 of this utility model;

[0022] Figure 2 This is a perspective view of another embodiment of the present utility model;

[0023] Figure 3 This is an exploded perspective view of Embodiment 1 of this utility model;

[0024] Figure 4 This is a perspective view of the fourth friction plate in Embodiment 1 of this utility model;

[0025] Figure 5 This is a perspective view of the first friction plate in Embodiment 1 of this utility model;

[0026] Figure 6 This is a perspective view of Embodiment 2 of this utility model;

[0027] Figure 7 This is a perspective view of another embodiment of the present invention;

[0028] Figure 8 This is an exploded perspective view of Embodiment 2 of this utility model. Detailed implementation method:

[0029] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0030] Example 1:

[0031] See Figure 1-5 As shown, this is a friction-damped hinge assembly, which can be used in home appliances, smart homes, doors, automobiles, machinery, etc. It is suitable for any environment that requires damping for slow descent and has hovering and limiting functions.

[0032] This utility model includes: a stationary hinge 1, a hinge shaft 2, a movable hinge 3, a first damping module 4, and a second damping module 5. The stationary hinge 1 is fixed on the base, and the movable hinge 3 is mounted on the cover plate.

[0033] The hinge shaft 2 is fixed within the stationary hinge 1, with a first threaded section 21 and a second threaded section 22 at its lower and upper parts, respectively. The movable hinge 3 is sleeved on the hinge shaft 2 and can rotate relative to it. A boss 31 is also provided in the middle of the movable hinge 3, which is sleeved outside the hinge shaft 2 and can rotate. The first damping module 4 includes a first friction plate 41 and a second friction plate 42 sleeved on the hinge shaft 2 and in contact with each other, a first spring 43, and a first nut 44. The first spring 43 provides elastic force to the first friction plate 41 to drive the first friction plate 41 and the second friction plate 42 to fit tightly together, generating damping force through friction. The first nut 44 is screwed onto the first threaded section 21 and is used to adjust the compression of the first spring 43 to adjust the damping force between the first friction plate 41 and the second friction plate 42. The second friction plate 42 is fixedly assembled to the lower end of the boss 31 and cannot rotate relative to each other; the second damping module 5 includes a third friction plate 51 and a fourth friction plate 52 sleeved on the hinge shaft 2 and in contact with each other, a second spring 53, and a second nut 54. The second spring 53 provides elastic force to the fourth friction plate 52 to drive the fourth friction plate 52 and the third friction plate 51 to fit tightly together, so as to generate damping force through friction. The second nut 54 is screwed on the second threaded section 22 and is used to adjust the compression of the second spring 53 to adjust the damping force between the third friction plate 51 and the fourth friction plate 52. The third friction plate 51 is fixedly assembled to the upper end of the boss 31 and cannot rotate relative to each other; the fourth friction plate 52 is circumferentially positioned with the hinge shaft 2 to rotate synchronously or be fixed. In this embodiment, the fourth friction plate 52 is circumferentially positioned with the hinge shaft 2 to rotate synchronously.

[0034] The structure of this utility model is relatively novel. The hinge shaft 2 is fixed to the stationary hinge 1 and cannot rotate between them. The movable hinge 3 is sleeved on the hinge shaft 2 and can rotate relative to the hinge shaft 2. The fourth friction plate 52 is circumferentially positioned with the hinge shaft 2 to rotate synchronously, so that there is no relative rotation between the hinge shaft 2 and the stationary hinge 1. This ensures that when the fourth friction plate 52 is subjected to frictional force with the third friction plate 51, there is no relative rotation between the third friction plate 51 and the hinge shaft 1 and the stationary hinge 2, thereby improving the friction damping effect.

[0035] The working principle of this invention is as follows: the movable hinge 3 rotates relative to the hinge shaft 2 and the stationary hinge 1. At this time, the movable hinge 3 will drive the third friction plate 51 to rotate relative to the fourth friction plate 52, while the fourth friction plate 52 is fixed to the hinge shaft 2 and cannot rotate, so as to facilitate the formation of better damping effect by the first and second damping modules later. The second spring 53 provides elastic force to the fourth friction plate 52 to drive the fourth friction plate 52 to be tightly pressed against the third friction plate 51. When the third friction plate 51 rotates relative to the fourth friction plate 52, it generates damping force through friction, which is extremely large. The second spring 53 and one side of the second nut also form damping. Simultaneously, the movable hinge 3 will drive the second friction plate 42 to rotate relative to the first friction plate 41, and the first spring 43 provides elastic force to the first friction plate 41 to drive the first friction plate 41 to be tightly pressed against the second friction plate 42, so as to achieve better damping effect through friction. The damping force is generated by friction, and the first spring 43 and one side of the first nut also form damping, thereby achieving damping at multiple positions. This ensures that the moving hinge 3 forms a sufficiently large damping force relative to the hinge shaft 2 and the stationary hinge 1, achieving the following advantages: This utility model does not set a separate rotation damper, that is, it uses friction to generate damping force. The first and second damping modules are both composed of nuts, springs, friction plates, etc., which are modular structures and compact in structure, reducing the space required for hinge assembly installation, which is beneficial for applications in structures with high installation space requirements. Furthermore, the fourth friction plate 52 and the third friction plate 51 are in surface-to-surface contact with a large contact area, so no sharp collisions or knocking noises will occur when shaking or changing positions. This invention also uses a second spring 53 to provide elastic force to the fourth friction plate 52, ensuring that the fourth friction plate 52 and the third friction plate 51 are tightly fitted together. The third friction plate 51 is fixed to the moving hinge 3, while the fourth friction plate 52 is fixed to the hinge shaft 2. This allows the moving hinge 3 to drive the third friction plate 51 and the fourth friction plate 52 to rotate stably, effectively ensuring the overall stability of the hinge. The hinge 3 provides stability and generates excellent damping force, which is extremely large. At the same time, the moving hinge 3 drives the second friction plate 42 to rotate relative to the first friction plate 41. The first spring 43 provides elastic force to the first friction plate 41, so as to drive the first friction plate 41 and the second friction plate 42 to fit tightly together. This generates damping force through friction, so that when the moving hinge 3 rotates relative to the stationary hinge 1, it generates a sufficiently large damping force. This makes it suitable for suspending cover plates that are very light or very heavy. Moreover, the damping force has good durability and is not easy to fail even after long-term use, thus ensuring product quality.In addition, the damping force of the first damping module 4 and the second damping module 5 can be adjusted by tightening or loosening the first nut and the second nut respectively to meet different usage requirements. By tightening the first nut and the second nut, the first spring increases the elastic force to drive the first friction plate 41 and the second friction plate 42 to fit tightly together, and the second spring increases the elastic force to drive the third friction plate 51 and the fourth friction plate 52 to fit tightly together, thereby greatly enhancing the damping force. The first damping module can provide the cover plate with a damping force that allows the cover plate to suspend. While providing the suspension damping force, the first damping module also realizes the function of limiting the angle of the cover plate.

[0036] The first, second, third, and fourth friction plates are all made of highly wear-resistant, buffering, and self-lubricating materials, making them resistant to wear and with a long lifespan. After approximately 50,000 cycles, the frictional force decreases by less than 5%. Furthermore, springs are used for automatic compensation after friction plate wear, ensuring that the frictional force decreases slowly during use and preventing a complete loss of friction. For example, after wear occurs between the first friction plate 41 and the second friction plate 42, the first spring continuously provides elastic force to the first friction plate 41, keeping it tightly pressed against the second friction plate 42, thus automatically compensating for the gap and ensuring that the frictional force decreases slowly during use, preventing a complete loss of friction. Similarly, after wear occurs between the third friction plate 51 and the fourth friction plate 52, the second spring continuously provides elastic force to the fourth friction plate, keeping it tightly pressed against the third friction plate, thus automatically compensating for the gap and ensuring that the frictional force decreases slowly during use, preventing a complete loss of friction.

[0037] Furthermore, to enable the second damping module to achieve better angle limiting function, the following design was made: the upper end of the third friction plate 51 has a first concave-convex wave surface 511 with annular distribution; the lower end of the fourth friction plate 52 has a second concave-convex wave surface 521 with annular distribution and adapted to the first concave-convex wave surface 511. As the contact between the convex surface of the first concave-convex wave surface 511 and the concave surface of the second concave-convex wave surface 521 gradually progresses to the contact between the convex surface of the first concave-convex wave surface 511 and the convex surface of the second concave-convex wave surface 521, the third friction plate 51 and the fourth friction plate 52 move away from each other to gradually compress the second spring and enhance the damping force between the third friction plate 51 and the fourth friction plate 52 and the oblique force that needs to be overcome when shifting gears, thus providing an angle limiting function at a fixed position. The cooperation between the third friction plate 51 and the fourth friction plate 52 is also changed to provide a reaction force with an oblique angle to provide rotational resistance, which, combined with friction, provides greater resistance. Specifically, the third friction plate 51 and the fourth friction plate 52 provide both suspension damping force and angle limiting function. When subjected to external force or vibration within a certain value, the cover plate can still maintain its original position. The third friction plate 51 and the fourth friction plate 52 are designed with concave and convex structures (a combination of the first concave and convex wave surface 511 and the second concave and convex wave surface 521). When the moving hinge rotates relative to the stationary hinge to the required angle, the concave and convex structures on the third friction plate 51 and the fourth friction plate 52 fit tightly together, and the hinge assembly achieves the limiting function, that is, limiting the moving hinge relative to the stationary hinge. Its resistance value can also be changed by rotating the third nut 54 to adjust the compression of the second spring 53. When subjected to external force vibration, when the hinge assembly achieves the limiting function, the cover plate will not fall freely, achieving true suspension and meeting the suspension usage requirements. In many actual application scenarios, the suspension hinge needs to have a limiting function when opened to the maximum angle or a certain special angle, that is, when subjected to external force or vibration within a certain value, the cover plate can still maintain its original position.

[0038] The fixed assembly structure of the hinge shaft 2 and the fourth friction plate 52 is as follows: the cross-section of the middle part of the hinge shaft 2 is polygonal to form a first polygonal segment 23. The hole in the middle part of the fourth friction plate 52 is a first polygonal hole 522. After the fourth friction plate 52 is sleeved on the first polygonal segment 23 in the middle part of the hinge shaft 2 through the first polygonal hole 522, they can slide axially but cannot rotate circumferentially. That is, the fourth friction plate 52 can be stably sleeved on the hinge shaft 2 and cannot rotate between them.

[0039] The stationary hinge 1 is semi-rectangular, with both its upper and lower ends assembled to the hinge shaft 2. A connecting plate 10 is also provided on the outer side of the stationary hinge 1. The connecting plate 10 has several first connecting holes 101, and a reinforcing rib 102 is integrally connected between the connecting plate 10 and the outer side of the stationary hinge 1 to increase strength. The connecting plate 10 is fitted snugly to the base, and screws pass through the first connecting holes 101 and are screwed into the base to fix the stationary hinge 1 to the base.

[0040] The hinge shaft 2 has a second polygonal segment 24 at the lower part of the first threaded section. The hole at the lower part of the stationary hinge 1 is a second polygonal hole 11. After the second polygonal segment 24 passes through the second polygonal hole, it can slide axially but cannot rotate circumferentially. That is, the hinge shaft 2 and the stationary hinge 1 cannot rotate.

[0041] The upper hinge bushing 35 and the lower hinge bushing 34 are respectively inserted into the upper shaft hole 32 and the lower shaft hole 33 of the movable hinge 3. The movable hinge 3 uses the upper hinge bushing 35 and the lower hinge bushing 34 to pass through the hinge shaft 2 to form a rotating assembly structure. Its structure is stable and wear-resistant, reducing the risk of wear.

[0042] The boss 31 is provided with a central shaft hole 311 that passes through the upper and lower end faces. The top of the hinge shaft 2 is provided with a slot 201. The top of the hinge shaft 2 passes through the second polygonal hole 11 at the bottom of the stationary hinge 1, the lower shaft hole 33, the central shaft hole 311 of the boss 31, the upper hinge bushing 35, and the round hole 12 at the top of the stationary hinge 1 from bottom to top, and extends out of the upper end face of the stationary hinge 1. The snap ring 25 is snapped and fixed in the slot 201 and contacts the upper end face of the stationary hinge 1. Its assembly structure is simple and ensures that the hinge shaft 2 will not come out axially, thus improving product quality.

[0043] The first spring 43 has a first upper plane 431 and a first lower plane 432 cut on both its upper and lower ends. The first upper plane 431 contacts the lower surface of the second friction plate 42. The hinge shaft 2 is also fitted with a double-ear washer 26. The upper end face of the double-ear washer 26 contacts the first lower plane 432. The lower end face of the double-ear washer 26 contacts the upper end face of the first nut 44, forming a double-sided contact, that is, achieving damping at two positions. The surface-to-surface contact creates a large contact area, resulting in excellent damping effect. The double-ear washer 26... Each has two outwardly protruding lugs 261, which are bent relative to the first nut 44 to wrap around the outer surface of the first nut 44, preventing them from rotating and achieving a locking purpose, thereby improving the damping effect; there are two first nuts 44, which are screwed and fixed on the first threaded section 21 and in contact with each other to achieve interlocking, effectively preventing the two first nuts 44 from accidentally displacing relative to the first threaded section 21, thereby ensuring that the damping effect of the first damping module is in a constant state.

[0044] The upper and lower ends of the second spring 53 are both cut to form a second upper plane 531 and a second lower plane 532. The second lower plane 532 contacts the upper surface of the fourth friction plate 52. The hinge shaft 2 is also fitted with a first circular washer 27 and a second circular washer 28. The upper end face of the first circular washer 27 contacts the second upper plane 531 and the lower end face of the second nut 54. The upper end face of the second circular washer 28 contacts the second lower plane 532 and the lower end face of the fourth friction plate 52, forming a double-sided contact, i.e., achieving damping at two positions. The surface-to-surface contact creates a large contact area, resulting in excellent damping effect. Furthermore, there are two second nuts 54, both screwed onto the second threaded section 22 and in contact with each other.

[0045] The upper end of the second friction plate 42 is integrally formed with several upwardly protruding first limiting parts 421. The outer periphery of the protrusion 31 is provided with several first limiting grooves 312 that are adapted to the first limiting parts 421. The first limiting parts 421 are inserted into the first limiting grooves 312 from bottom to top to form circumferential limiting, that is, they cannot rotate relative to each other but can only rotate synchronously, and the second friction plate 42 and the protrusion 31 can slide axially.

[0046] The lower end of the third friction plate 51 is integrally formed with several downwardly protruding second limiting parts 512. The periphery of the protrusion 31 is provided with several second limiting grooves 313 that are adapted to the second limiting parts 512. The second limiting parts 512 are inserted into the second limiting grooves 313 from top to bottom to form circumferential limiting, that is, they cannot rotate relative to each other but can only rotate synchronously. The third friction plate 51 and the protrusion 31 can slide axially.

[0047] The hole in the center of the first friction plate 41 is a circular hole, and a gap is formed between the circular hole and the outer periphery of the middle part of the hinge shaft 2, so that they can rotate relative to each other.

[0048] The movable hinge 3 is E-shaped and is embedded in the stationary hinge 1. The movable hinge 3 has several second connecting holes 30 on its outer side for installation. After the movable hinge 3 is attached to the cover plate, the screw passes through the second connecting holes 30 and is screwed to the cover plate to fix the movable hinge 3 to the cover plate.

[0049] In summary, this invention does not use a separate rotary damper; instead, it generates damping force through friction. Both the first and second damping modules consist of nuts, springs, and friction plates, forming a modular and compact structure that reduces the space required for hinge assembly installation. This is beneficial for applications in structures with high installation space requirements. Furthermore, the fourth friction plate 52 and the third friction plate 51 have surface-to-surface contact with a large contact area, preventing significant sharp collisions or knocking noises during shaking or repositioning. This invention also uses a second spring 53 to provide elastic force to the fourth friction plate 52, ensuring a tight fit between the fourth and third friction plates 51. The third friction plate 51 is fixed to the moving hinge 3, while the fourth friction plate 52 is fixed to the hinge shaft 2. This allows the moving hinge 3 to drive the third and fourth friction plates 51 to rotate stably, effectively ensuring the stability of the hinge assembly. The hinge 3 provides stability and generates excellent damping force, which is extremely large. At the same time, the moving hinge 3 drives the second friction plate 42 to rotate relative to the first friction plate 41. The first spring 43 provides elastic force to the first friction plate 41, so as to drive the first friction plate 41 and the second friction plate 42 to fit tightly together. This generates damping force through friction, so that when the moving hinge 3 rotates relative to the stationary hinge 1, it generates a sufficiently large damping force. This makes it suitable for suspending cover plates that are very light or very heavy. Moreover, the damping force has good durability and is not easy to fail even after long-term use, thus ensuring product quality. In addition, the damping force of the first damping module 4 and the second damping module 5 can be adjusted by tightening or loosening the first nut and the second nut respectively to meet different usage requirements. By tightening the first nut and the second nut, the first spring increases the elastic force to drive the first friction plate 41 and the second friction plate 42 to fit tightly together, and the second spring increases the elastic force to drive the third friction plate 51 and the fourth friction plate 52 to fit tightly together, thereby greatly enhancing the damping force. The first damping module can provide the cover plate with a damping force that allows the cover plate to suspend. While providing the suspension damping force, the first damping module also realizes the function of limiting the angle of the cover plate.

[0050] Example 2: This Example 2 differs from Example 1 in that it combines... Figure 6-8As shown, the hole at the center of the first friction plate 41 is a third polygonal hole 411. After the first friction plate 41 is fitted onto the first polygonal segment 23 in the middle of the hinge shaft 2 through the third polygonal hole 411, it can slide axially but cannot rotate circumferentially. This ensures that the first friction plate 41 will not rotate relative to the hinge shaft 2 and the stationary hinge 1 when subjected to frictional force, thereby further improving the damping effect. In addition, the height difference between the concave and convex structures (the combination structure of the first concave and convex wave surface 511 and the second concave and convex wave surface 521) on the third friction plate 51 and the fourth friction plate 52 has been reduced to less than 2mm, so that no impact sound will be emitted after the hinge assembly reaches the limit position.

[0051] The other structures in this second embodiment are the same as those in the first embodiment, and can achieve the same technical effects as in the first embodiment, so they will not be described in detail here.

[0052] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A friction-damped hinge assembly, characterized in that: It includes: Static hinge (1); The hinge shaft (2) is fixed in the static hinge (1), and its lower and upper parts are respectively provided with a first threaded section (21) and a second threaded section (22); A movable hinge (3) is sleeved on the hinge shaft (2) and can rotate relative to the hinge shaft (2). A boss (31) is also provided in the middle of the movable hinge (3). The boss (31) is sleeved on the outside of the hinge shaft (2) and can rotate. The first damping module (4) includes a first friction plate (41) and a second friction plate (42) sleeved on the hinge shaft (2) and in contact with each other, a first spring (43), and a first nut (44). The first nut (44) is screwed on the first threaded section (21) and is used to adjust the compression of the first spring (43) to adjust the damping force between the first friction plate (41) and the second friction plate (42). The second friction plate (42) is assembled with the lower end of the boss (31) and cannot rotate relative to each other. The second damping module (5) includes a third friction plate (51) and a fourth friction plate (52) sleeved on the hinge shaft (2) and in contact with each other, a second spring (53), and a second nut (54). The second nut (54) is screwed and fixed on the second threaded section (22) and is used to adjust the compression of the second spring (53) to adjust the damping force between the third friction plate (51) and the fourth friction plate (52). The third friction plate (51) is assembled with the upper end of the boss (31) and cannot rotate relative to each other. The fourth friction plate (52) is circumferentially positioned with the hinge shaft (2) to rotate synchronously or be fixed.

2. The friction-damped hinge assembly according to claim 1, characterized in that: The upper end of the third friction plate (51) is formed with a first concave-convex wave surface (511) distributed in an annular pattern; the lower end of the fourth friction plate (52) is formed with a second concave-convex wave surface (521) distributed in an annular pattern and adapted to the first concave-convex wave surface (511). When the convex surface in the first concave-convex wave surface (511) gradually contacts the concave surface in the second concave-convex wave surface (521) and gradually the convex surface in the first concave-convex wave surface (511) contacts the convex surface in the second concave-convex wave surface (521), the third friction plate (51) and the fourth friction plate (52) move away from each other to gradually compress the second spring and enhance the damping force between the third friction plate (51) and the fourth friction plate (52) and the oblique force that needs to be overcome when shifting gears, so as to provide an angle limiting function at a fixed position.

3. The friction-damped hinge assembly according to claim 1, characterized in that: The cross-section of the middle part of the hinge shaft (2) is polygonal to form a first polygonal segment (23). The hole in the middle part of the fourth friction plate (52) is a first polygonal hole (522). After the fourth friction plate (52) is sleeved on the first polygonal segment (23) in the middle part of the hinge shaft (2) through the first polygonal hole (522), it can slide axially but cannot rotate circumferentially.

4. The friction-damped hinge assembly according to claim 3, characterized in that: The hinge shaft (2) has a second polygonal segment (24) at the lower part of the first threaded section. The hole at the lower part of the static hinge (1) is a second polygonal hole (11). After the second polygonal segment (24) passes through the second polygonal hole, it can slide axially but cannot rotate circumferentially.

5. The friction-damped hinge assembly according to any one of claims 1-4, characterized in that: The upper hinge bushing (35) and the lower hinge bushing (34) are respectively inserted into the upper shaft hole (32) and the lower shaft hole (33) of the moving hinge (3). The boss (31) is provided with a central shaft hole (311) that passes through the upper and lower end faces. The top of the hinge shaft (2) is provided with a slot (201). The top of the hinge shaft (2) passes through the second polygonal hole (11) at the bottom of the stationary hinge (1), the lower shaft hole (33), the central shaft hole (311) of the boss (31), the upper hinge bushing (35), and the round hole (12) at the top of the stationary hinge (1) from bottom to top and extends out of the upper end face of the stationary hinge (1). The snap ring (25) is snapped and fixed in the slot (201) and contacts the upper end face of the stationary hinge (1).

6. The friction-damped hinge assembly according to claim 5, characterized in that: The upper and lower ends of the first spring (43) are cut to form a first upper plane (431) and a first lower plane (432), and the first upper plane (431) contacts the lower surface of the second friction plate (42); the hinge shaft (2) is also fitted with a double-ear washer (26), the upper end of the double-ear washer (26) contacts the first lower plane (432), and the lower end of the double-ear washer (26) contacts the upper end of the first nut (44); wherein, each of the double-ear washer (26) has two outwardly protruding ears (261); the number of the first nuts (44) is two, both of which are screwed and fixed on the first threaded section (21) and in contact with each other.

7. The friction-damped hinge assembly according to claim 5, characterized in that: The upper and lower ends of the second spring (53) are cut to form a second upper plane (531) and a second lower plane (532). The second lower plane (532) is in contact with the upper surface of the fourth friction plate (52). The hinge shaft (2) is also fitted with a first circular washer (27) and a second circular washer (28). The upper end of the first circular washer (27) is in contact with the second upper plane (531). The upper end of the first circular washer (27) is in contact with the lower end of the second nut (54). The upper end of the second circular washer (28) is in contact with the second lower plane (532). The lower end of the second circular washer (28) is in contact with the lower end of the fourth friction plate (52). There are two second nuts (54), which are screwed and fixed on the second threaded section (22) and in contact with each other.

8. The friction-damped hinge assembly according to any one of claims 1-4, characterized in that: The upper end of the second friction plate (42) is integrally formed with a plurality of upwardly protruding first limiting parts (421). The outer periphery of the protrusion (31) is provided with a plurality of first limiting grooves (312) that are adapted to the first limiting parts (421). The first limiting parts (421) pass through the first limiting grooves (312) from bottom to top to form circumferential limiting, and the second friction plate (42) and the protrusion (31) can slide axially.

9. The friction-damped hinge assembly according to claim 8, characterized in that: The lower end of the third friction plate (51) is integrally formed with several downward protruding second limiting parts (512). The outer periphery of the boss (31) is provided with several second limiting grooves (313) that are adapted to the second limiting parts (512). The second limiting parts (512) pass through the second limiting grooves (313) from top to bottom to form circumferential limiting. The third friction plate (51) and the boss (31) can slide axially.

10. The friction-damped hinge assembly according to any one of claims 1-4, characterized in that: The hole in the center of the first friction plate (41) is a circular hole, and a gap is formed between the circular hole and the outer periphery of the middle part of the hinge shaft (2), so that they can rotate relative to each other; or, the hole in the center of the first friction plate (41) is a third polygonal hole (411), and the first friction plate (41) is sleeved on the first polygonal segment (23) in the middle part of the hinge shaft (2) through the third polygonal hole (411), and they can slide axially but cannot rotate circumferentially.

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