A coaxial low noise smooth type of torsion spring hinge with slow return

Abstract

This invention provides a coaxial, low-noise, smooth, slow-rebound torsion spring hinge. It utilizes the release of elastic force after the torsion spring is twisted to achieve automatic rebound during hinge closure, while simultaneously using the resistance of a hydraulic damper to reduce the impact force during hinge closure. In particular, the structure of the buffer component that works in conjunction with the hydraulic damper has been improved, featuring a spiral slide and ball bearings to enable the buffer component to function with extremely low friction, eliminating frictional noise at the mating surfaces of the buffer component, and resulting in better smoothness during hinge rotation.

Description

Technical Field

[0001] This invention relates to the field of hinge device technology, and specifically to a coaxial, low-noise, smooth, slow-rebound torsion spring hinge. Background Technology

[0002] A hinge, also known as a door hinge, is a mechanical device used to connect two working components and allow relative rotation between them. In specific applications, such as refrigerator doors where prolonged open operation is not permitted, the hinge must not only fulfill its function of controlling door opening and closing but also automatically return to the closed position when external forces are removed. On the other hand, when a hinge reaches the closed position, its significant inertia, combined with the spring's rebound force, can generate substantial vibration and noise without proper cushioning, potentially damaging the hinge or its working components. Therefore, achieving automatic hinge rebound and reducing the impact vibration generated when the hinge closes while simplifying its structural complexity is a pressing issue. Furthermore, different applications require different rebound forces and impact buffering angles; therefore, increasing the degree of freedom in parameter adjustment can enhance the hinge's application value.

[0003] Although some hinge products with soft rebound function already exist on the market, each with its own different buffer structure, in coaxial soft rebound hinges, the buffer component still has problems such as inconvenient assembly and friction noise after a period of use. Moreover, after the mating parts of the buffer component are damaged by friction, the change in mating dimensions will cause dimensional deviations in the assembly relationship of other parts, further increasing the noise and deteriorating the smoothness of the hinge during use. Summary of the Invention

[0004] Based on the aforementioned technological status, the purpose of this invention is to provide a coaxial, low-noise, smooth, slow-rebound torsion spring hinge. While utilizing the release of elastic force after the torsion spring is twisted to achieve automatic rebound during hinge closure, the invention also utilizes the resistance of a hydraulic damper to reduce the impact force during hinge closure. In particular, the structure of the buffer component that cooperates with the hydraulic damper has been improved, featuring a spiral slide and ball bearings to enable the buffer component to function with extremely low friction, eliminating frictional noise from the mating surfaces of the buffer component, and resulting in better smoothness during hinge rotation.

[0005] The technical solution provided by this invention is: a coaxial low-noise smooth-smooth soft-rebound torsion spring hinge, which includes a left fixed hinge assembly, a right rotating hinge assembly, an upper shaft cover, a torsion spring, a rotating motion component, a ball bearing, a linear motion component, a hydraulic damper, and a hydraulic sleeve.

[0006] The left fixed hinge assembly has an axial through hole for connecting the upper shaft cover and the hydraulic sleeve. The right rotating hinge assembly has an axial through hole for the rotating shaft to pass through axially. The upper shaft cover has a radial slot for constraining the rotation arm of the torsion spring. The hydraulic sleeve has an opening for fixing the threaded groove of the rotating shaft and fixing the movement range of the hydraulic damper. The tail arm of the torsion spring and the upper radial slot of the circular stiffener welded in the middle of the axial through hole of the right rotating hinge mutually constrain each other. The bottom of the welded circular stiffener is welded to the rotating motion component. The rotating motion component is combined with the linear motion component through a ball bearing. The bottom of the linear motion component is connected to the thin end of the hydraulic damper. A rotating shaft sleeve is provided on the outside of the ball bearing, the linear motion component, and the hydraulic damper. The upper shaft cover, the torsion spring, the rotating motion component, the ball bearing, the linear motion component, the hydraulic damper, and the hydraulic sleeve together constitute the rotating shaft of the hinge.

[0007] Specifically, the rear side of the left fixed hinge assembly is also fixed with a left partition and a left baffle by countersunk screws. During assembly, the left fixed hinge assembly and the left baffle are located on both sides of the left partition. The rear side of the right rotating hinge assembly is also fixed with a right partition and a right baffle by countersunk screws. During assembly, the right rotating hinge assembly and the right baffle are located on both sides of the right partition. In addition, the right rotating hinge assembly is also welded with a baffle portion. When the left fixed hinge assembly and the right rotating hinge assembly are on the same plane, the hydraulic damper is in a compressed state, and its restoring force is smaller than the axial component of the initial restoring force given to the damper sleeve by the torsion spring.

[0008] Furthermore, the left fixed hinge assembly has a first section and a second section. The axial through hole of the first section communicates with the radial hole of the fixed pre-tightening baffle and the pre-tightening baffle groove. At the same time, the first end of the pre-tightening baffle engages with the circumferential toothed groove of the upper shaft cover to constrain its axial movement. The axial through hole of the second section has the same outer diameter as the hydraulic sleeve, allowing the hydraulic sleeve to be installed.

[0009] Preferably, the right-turn hinge assembly has an intermediate section, and a circular stiffener is welded to the middle of the intermediate section, perpendicular to the axial through hole; the circular stiffener is provided with a cylindrical radial groove with a certain elongation on the side of the first section of the left fixed hinge assembly; the circular stiffener is provided with a rotating motion component on the side of the second section of the left fixed hinge assembly.

[0010] Preferably, the middle section of the right-turning hinge assembly and the first and second sections of the left fixed hinge assembly each have upper and lower rubber gaskets. The maximum outer diameter of the two gaskets is the same as the outer diameter of the hinge cylinder, and they have a central hole. The inner diameter of the central hole of the upper gasket is the same as the outer diameter of the torsion spring, and the outer diameter of the lower gasket is the same as the outer diameter of the hydraulic sleeve, thus constraining their axial and radial degrees of freedom. Preferably, the left fixed hinge assembly has two left connecting posts with threaded holes and a boss, followed by a left partition and a left baffle. The left partition has the same overall size as the left fixed hinge assembly, covering the internal support structure of the left fixed hinge assembly. The left partition has three countersunk holes, through which three countersunk screws are screwed into the threaded holes to fix the left partition to the left fixed hinge assembly. The left baffle has the same overall size as the left fixed hinge assembly, and has two countersunk holes, through which two countersunk screws are screwed into the connecting posts. In addition, there is a gasket-connecting post sleeve-gasket structure between the left baffle and the left partition.

[0011] Preferably, the right-turn hinge assembly has two right connecting posts with threaded holes and a boss, followed by a right partition and a side baffle. The right partition has the same overall size as the right chain assembly, covering the internal support structure of the right-turn hinge assembly. The right partition also has three countersunk holes through which three countersunk screws are screwed into the threaded holes to fix the right partition to the right-turn hinge assembly. The right baffle has the same overall size as the right-turn hinge assembly, and also has two countersunk holes through which two countersunk screws are screwed into the connecting posts. Furthermore, there is a gasket-connecting post sleeve-gasket structure between the right baffle and the right partition.

[0012] Furthermore, the hinge cylinder contains a rotating shaft, which is composed of an upper shaft cover, a torsion spring, a rotary motion component, ball bearings, a linear motion component, a hydraulic damper, and a hydraulic sleeve. The circumference of the upper shaft cover where it mates with the pre-tensioning baffle has an array of evenly distributed toothed grooves. Simultaneously, the end face of the upper shaft cover has corresponding scale indicators at the same positions as the grooves. The torsion spring's first end is constrained and fixed by a radial slot in the upper shaft cover, and its last end is constrained and fixed by a cylindrical radial groove on the internal circular rib plate of the right-hand hinge assembly's middle section. The rotary motion component is a cylindrical component with two centrally symmetrical protrusions at its lower end to support the ball bearings, ensuring the ball bearings move along the grooves of the linear motion component. The linear motion component is also a cylindrical component with two centrally symmetrical spirally ascending curved slides along its outer edge. The slide has grooves for the movement of the ball bearings; the linear motion component has two grooves on both sides that engage with the protrusions on the inner side of the hydraulic sleeve, ensuring that the linear motion component moves linearly when the right-hand hinge assembly rotates; the hydraulic sleeve is a part that houses the hydraulic rod, the linear motion component, and the rotary motion component; the lower half of the hydraulic sleeve has a screw hole that engages with the left fixed hinge assembly, and is fixed to the second section of the left fixed hinge assembly by bolts; the interior of the lower half of the hydraulic sleeve is a cylindrical space for fixing the hydraulic rod, with a height the same as the length of the hydraulic rod tube; the upper half of the hydraulic sleeve has symmetrical and protruding slides on its inner side, allowing the linear motion component to reciprocate linearly along the axis of the hydraulic sleeve on the slides; thus, a coaxial rotating shaft containing a torsion spring and a hydraulic damper, with both ends fixed to the left fixed hinge assembly, is formed.

[0013] When the hinge is closed in its natural state, the hydraulic damper is compressed, and the torsion spring has an adjustable preload torque sufficient to overcome the axial resistance of the hydraulic damper, thus keeping the left fixed hinge assembly and the right rotating hinge assembly closed. When the hinge is opened, the rotating component rotates under the drive of the right rotating hinge, causing the linear component to move upward, the hydraulic damper to extend, and the torsion spring to store energy. Subsequently, the hinge rotates in the opposite direction under the torque stored in the torsion spring to return to the closed state. As the rotating shaft rotates, the hydraulic damper is gradually compressed, which buffers the rotation process.

[0014] The advantages of the technical solution of this invention are:

[0015] (1) An adjustable and retractable baffle is adopted. The buffer angle can be freely adjusted through the retractable baffle. The initial torque of the spring can be adjusted in one direction through the cooperation of the bushing with the toothed groove and the pre-tightening baffle. This makes it easy to change the initial buffer position when the hinge is closed according to different application scenarios.

[0016] (2) The ratchet engagement preload structure is adopted, which makes it easy to change the initial rebound effect of the torsion spring when the hinge is closed;

[0017] (3) By adjusting the initial torsion angle, the torque generated by the torsion spring and the resistance provided by the hydraulic damper in the natural closed state are balanced, so that the hinge is in a mild stress state when it is opened by external force and in the natural rebound state. The impact force is reduced while ensuring the normal rebound of the hinge, so as not to cause collision damage to the hinge.

[0018] (4) It adopts a coaxial design, with a simple hinge structure, and each component is easy to process, manufacture and assemble;

[0019] (5) The rotary motion parts and the linear motion parts are connected by a centrally symmetrical double helix slide and ball bearings. The rolling friction force is used to achieve extremely low friction on the mating surface, and the smoothness of the hinge rotation is also stronger. No noise and rotational lag will be caused by the large friction force of the surface contact mating between the buffer parts. Attached Figure Description

[0020] Figure 1a This is a schematic diagram of the overall outline structure of the hinge of the present invention;

[0021] Figure 1b This is a disassembled schematic diagram of the overall hinge structure of the present invention;

[0022] Figure 1c This is a top view of the overall hinge structure of the present invention;

[0023] Figure 1d This is a rear view of the overall hinge structure of the present invention;

[0024] Figure 2 This is a structural view of the internal components when the hinge of the present invention is in the closed state;

[0025] Figure 3a This is a front view of the left fixed hinge assembly of the hinge of the present invention;

[0026] Figure 3b This is a rear view of the left fixed hinge assembly of the hinge of the present invention;

[0027] Figure 3c This is a perspective view of the left fixed hinge assembly of the hinge of the present invention;

[0028] Figure 4a This is a front view of the right-turning hinge assembly of the hinge of the present invention;

[0029] Figure 4b This is a rear view of the right-turning hinge assembly of the hinge of the present invention;

[0030] Figure 4c This is a perspective three-dimensional view of the right-turning hinge assembly of the hinge of the present invention;

[0031] Figure 5a This is a perspective view of the upper shaft cover of the hinge of the present invention;

[0032] Figure 5b This is a stereoscopic view of the upper shaft cover of the hinge of the present invention. Figure 2 ;

[0033] Figure 6a This is a perspective view of the hydraulic sleeve of the hinge of the present invention;

[0034] Figure 6b This is a transparent three-dimensional view of the hydraulic sleeve of the hinge of the present invention;

[0035] Figure 7a This is a perspective view of the pre-tensioning baffle groove cover of the hinge of the present invention;

[0036] Figure 7b This is a stereoscopic view of the pre-tensioning baffle groove cover of the hinge of the present invention. Figure 2 ;

[0037] Figure 8 This is a schematic diagram of the torsion spring structure of the hinge of the present invention;

[0038] Figure 9 This is a schematic diagram of the upper washer structure of the hinge of the present invention;

[0039] Figure 10 This is a schematic diagram of the lower washer structure of the hinge of the present invention;

[0040] Figure 11 This is a schematic diagram of the pre-tensioning baffle structure of the hinge of the present invention;

[0041] Figure 12a This is a perspective view of the rotating motion component of the hinge of the present invention.

[0042] Figure 12b This is a stereoscopic view of the rotating motion component of the hinge of the present invention. Figure 2 ;

[0043] Figure 13 This is a schematic diagram of the mating relationship of the buffer components of the hinge in this invention;

[0044] Figure 14 This is a schematic diagram of the mating relationship of the buffer components of the hinge in this invention. Figure 2 ;

[0045] Figure 15a This is a front view of the left partition of the hinge of the present invention;

[0046] Figure 15b This is a rear view of the left partition of the hinge of the present invention;

[0047] Figure 15c This is a perspective view of the left partition of the hinge of the present invention;

[0048] Figure 16a This is a front view of the right partition of the hinge of the present invention;

[0049] Figure 16b This is a rear view of the right partition of the hinge of the present invention;

[0050] Figure 16c This is a perspective view of the right partition of the hinge of the present invention;

[0051] Figure 17a This is a front view of the left baffle of the hinge of the present invention;

[0052] Figure 17b This is a perspective view of the left baffle of the hinge of the present invention;

[0053] Figure 18a This is a front view of the right baffle of the hinge of the present invention;

[0054] Figure 18b This is a perspective view of the right baffle of the hinge of the present invention;

[0055] Figure 19a This is a perspective view of the linear motion component of the hinge of the present invention.

[0056] Figure 19b This is a stereoscopic view of the linear motion component of the hinge of the present invention. Figure 2 ;

[0057] Figure 20 This is a schematic diagram of the hydraulic damper structure of the hinge of the present invention;

[0058] Figure 21a This is a front view of the rubber pad of the hinge of the present invention;

[0059] Figure 21b This is a perspective view of the rubber pad of the hinge of the present invention;

[0060] Figure 22 This is a schematic diagram of the connecting column sleeve structure of the hinge of the present invention;

[0061] In the diagram: 1. Left fixed hinge assembly; 2. Right rotating hinge assembly; 3. Left assembly; 4. Right assembly; 5. Upper shaft cover; 6. Hydraulic sleeve; 7. Preload baffle groove cover; 8. Torsion spring; 9. Upper washer; 10. Lower washer; 11. Preload baffle; 12. Connecting column sleeve; 13. Rotary motion component; 14. Ball bearing; 15. Left partition; 16. Right partition; 17. Left baffle; 18. Right baffle; 19. Linear motion component; 20. Hydraulic damper; 21. Socket head cap countersunk screw one; 22. Socket head cap countersunk screw two; 23. Hydraulic sleeve fixing pin; 24. Preload baffle groove cover fixing screw; 25. Rubber gasket.

[0062] 1-1, Section 1; 1-2, Section 2; 1-3, Pre-tightening baffle hole; 1-4, Left connecting column; 1-5, Left boss; 1-6, Pre-tightening baffle groove cover fixing hole; 1-7, Pre-tightening baffle groove cover clip; 1-8, Hydraulic sleeve fixing hole.

[0063] 2-1. Intermediate section; 2-2. Right connecting column; 2-3. Right boss; 2-4. Circular welded stiffener; 2-5. Torsion spring fixing slot.

[0064] 5-1. Scale indicator line; 5-2. Upper shaft cover head; 5-3. Upper shaft cover neck one; 5-4. Upper shaft cover neck two; 5-5. Toothed scale groove; 5-6. Upper spring retainer groove; 5-7. Upper shaft cover hexagonal groove; 5-8. Circumferential limit baffle.

[0065] 6-1. Internal slide of hydraulic sleeve; 6-2. Fixed position of hydraulic damper; 6-3. Limiting hole of hydraulic sleeve; 6-4. Base of hydraulic sleeve.

[0066] 7-1, Preload groove cover contact surface; 7-2, Preload groove cover threaded through hole; 7-3, Preload retaining groove;

[0067] 8-1. The first end of the torsion spring; 8-2. The last end of the torsion spring; 8-3. The main body of the spring;

[0068] 11-1. Pre-tightening baffle body; 11-2. Pre-tightening baffle head end;

[0069] 13-1 Welding surface on rotating parts; 13-2 Rotating contact surface; 13-3 Inner rotating shaft; 13-4 Ball groove;

[0070] 15-1, outer contact surface of left partition plate; 15-2, left connecting post hole; 15-3, left countersunk hole; 15-4, impact relief boss.

[0071] 16-1, outer contact surface of right partition; 16-2, right connecting post hole; 16-3, right countersunk hole;

[0072] 17-1, Countersunk hole of left baffle; 17-2, Inner contact surface of left baffle;

[0073] 18-1, Countersunk hole of right baffle; 18-2, Inner contact surface of right baffle;

[0074] 19-1, Bottom surface of linear motion component; 19-2, Ball bearing slide; 19-3, Motion slide groove;

[0075] 20-1. Main body of hydraulic damper; 20-2. Piston rod of hydraulic damper;

[0076] 25-1. Gasket connection post hole. Detailed Implementation

[0077] The following is a reference to Figure 1- Figure 22 The coaxial low-noise smooth-smooth rebound torsion spring hinge of the present invention is described in detail.

[0078] See Figures 1a-1d The coaxial low-noise, smooth-smooth, soft-rebound torsion spring hinge of the present invention consists of a left assembly 3 and a right assembly 4 coaxially mounted. The left assembly 3 is composed of a left fixed hinge assembly 1, a left partition 15, and a left baffle 17 assembled in sequence. The right assembly 4 is composed of a right rotating hinge assembly 2, a right partition 16, and a right baffle 18 assembled in sequence. When the right rotating hinge assembly 2 rotates relative to the left fixed hinge assembly 1, it drives the entire right assembly 4 to rotate relative to the left assembly 3. Of course, the movement relationship can also be reversed; for example, if the right assembly 4 is fixed to the door frame and the left assembly 3 is fixed to the door panel, then the left assembly 3 rotates relative to the right assembly 4. See also... Figure 1d Both the left assembly 3 and the right assembly 4 are assembled together using hexagon countersunk screws 21.

[0079] See Figures 3a-3c The left fixed hinge assembly 1 includes a main body and a first section 1-1 and a second section 1-2 with axial through holes formed at both ends of one side of the main body. On the back of the left fixed hinge assembly 1, i.e., the side that fits against the left partition 15, a left connecting post 1-4 and a left boss 1-5 are formed. Screw holes are provided on both the left connecting post 1-4 and the left boss 1-5. A countersunk hexagonal screw 21 passes through the left baffle 17 and the left partition 15 in sequence and is screwed into the left connecting post 1-4. The screw hole on the left boss 1-5 is used for a countersunk hexagonal screw 22 to be screwed in, thereby fixing the left partition 15 to the left fixed hinge assembly 1. An installation space for a pre-tightening baffle groove cover 7 is also formed on the back of the left fixed hinge assembly 1. (See [reference]). Figure 3b In this installation space, a pre-tightening baffle groove cover fixing hole 1-6 and a pre-tightening baffle groove cover clip 1-7 protruding from the left fixed hinge assembly 1 toward the installation space are also formed. The pre-tightening baffle groove cover 7 is installed on the left fixed hinge assembly 1 by the pre-tightening baffle groove cover fixing screw 24 cooperating with the pre-tightening baffle groove cover fixing hole 1-6. The edge of the pre-tightening baffle groove cover 7 is limited by the pre-tightening baffle groove cover clip 1-7 to lock the position of the pre-tightening baffle groove cover 7.

[0080] The first section 1-1 has a pre-tightening baffle hole 1-3 that penetrates its side wall and connects to the installation space of the pre-tightening baffle groove cover 7. A resiliently extendable pre-tightening baffle 11 is installed inside the pre-tightening baffle groove cover 7. The pre-tightening baffle 11 passes through the pre-tightening baffle hole 1-3 and extends into the axial through hole of the first section 1-1 to cooperate with the upper shaft cover 5. The second section 1-2 has a hydraulic sleeve fixing hole 1-8 that penetrates its side wall.

[0081] See Figures 4a-4c The right-turn hinge assembly 2 includes a main body and an intermediate section 2-1 with an axial through hole formed in the middle of one side of the main body. In the assembled state, the intermediate section 2-1 extends between the first section 1-1 and the second section 1-2, and the three are coaxially fitted. The right-turn hinge assembly 2 has a right connecting post 2-2 and a right boss 2-3 formed on the side that fits against the right partition. Screw holes are provided on both the right connecting post 2-2 and the right boss 2-3. The first hexagon countersunk screw 21 passes through the right baffle 18 and the right partition 16 in sequence and is screwed into the right connecting post 2-2. The screw hole of the right boss 2-3 is used for the second hexagon countersunk screw 22 to be screwed in and fixed, so as to fix the right partition 16 and the right-turn hinge assembly 2 in place.

[0082] See Figure 4c The interior of the intermediate section 2-1 is fixed with a circular welded stiffener plate 2-4. A torsion spring fixing slot 2-5 is fixedly provided on the upper end surface of the circular welded stiffener plate 2-4. A rotating motion component 13 is fixedly provided on the lower end surface of the circular welded stiffener plate 2-4. When the right-turn hinge assembly 2 rotates, the torsion spring fixing slot 2-5 and the rotating motion component 13 rotate synchronously.

[0083] See Figure 5a , Figure 5b These are, respectively, a three-dimensional view of the upper shaft cover of the hinge of the present invention and a three-dimensional view of the upper shaft cover of the hinge of the present invention. Figure 2 The upper shaft cover 5 is installed in the axial through hole of the first section 1-1. It includes a circular upper shaft cover head 5-2 and two cylindrical upper shaft cover necks 5-3 and 5-4. The upper shaft cover head 5-2, upper shaft cover neck 5-3, and upper shaft cover neck 5-4 are coaxially arranged, and the outline diameter of the upper shaft cover neck 5-4 is smaller than that of the upper shaft cover neck 5-3. Several toothed scale grooves 5-5 are opened in the middle of the upper shaft cover neck 5-3. The toothed scale grooves 5-5 are evenly distributed circumferentially, and the position of each toothed scale groove 5-5 is relative to the... The scale indicator lines 5-1 on the upper shaft cover head 5-2 correspond one-to-one to indicate the current initial working position of the spring for quantitative adjustment; the protrusion between the two scale grooves of the toothed scale groove 5-5 is a circumferential limiting baffle 5-8, used to limit the maximum adjustment value of the initial restoring force of the spring; the tail end of the upper shaft cover neck 5-4 has a rectangular upper spring retaining groove 5-6, used to fix the torsion spring head 8-1 of the torsion spring 8; the end face of the upper shaft cover head 5-2 is also provided with an upper shaft cover hexagonal groove 5-7, which facilitates positioning and adjustment using an Allen wrench.

[0084] Figure 6a This is a perspective view of the hydraulic sleeve of the hinge of the present invention. Figure 6bThis is a transparent three-dimensional view of the hydraulic sleeve of the hinge of the present invention. The hydraulic sleeve 6 is a cylindrical structure with one end open. The other end of the cylindrical structure is closed by the hydraulic sleeve base 6-4. It is installed in the axial through hole of the second section 1-2 and part of the intermediate section 2-1. Preferably, the end of the hydraulic sleeve 6 abuts against the lower end face of the circular welded stiffener 2-4. The internal space of the hydraulic sleeve 6 is divided into a large inner diameter section and a small inner diameter section by a stepped surface. The small inner diameter section constitutes the hydraulic damper fixing position 6-2. Its inner diameter is adapted to the outer diameter of the hydraulic damper 20 so that the hydraulic damper 20 can be installed inside the hydraulic sleeve 6. The large inner diameter section is connected to the open end of the hydraulic sleeve 6. An internal slide 6-1 of the hydraulic sleeve is provided on the side wall of the large inner diameter section. In the illustrated embodiment, the internal slide 6-1 of the hydraulic sleeve is an axially extending convex strip. Of course, it can also be a groove structure. The hydraulic sleeve 6 is also provided with a hydraulic sleeve limiting hole 6-3 on its side wall. After the hydraulic sleeve 6 is installed into the second section 1-2, the hydraulic sleeve limiting hole 6-3 cooperates with the hydraulic sleeve fixing hole 1-8. The hydraulic sleeve fixing pin 23 passes through the hydraulic sleeve fixing hole 1-8 and extends into the hydraulic sleeve limiting hole 6-3 to lock the rotation and axial movement of the hydraulic sleeve 6, so that the hydraulic sleeve 6 is relatively fixed with the left fixed hinge assembly 1.

[0085] See Figures 7a-11 A pre-tightening groove cover threaded through hole 7-2 is provided on the groove cover contact surface 7-1 of the pre-tightening groove cover 7 that fits onto the left fixed hinge assembly 1. The pre-tightening groove cover fixing screw 24 passes through the pre-tightening groove cover threaded through hole 7-2 and is screwed into the pre-tightening groove cover fixing hole 1-6. A pre-tightening slot 7-3 is provided on the side of the pre-tightening groove cover 7 near the first section 1-1. The pre-tightening slot 7-3 is used to install the pre-tightening baffle 11. A pre-tightening baffle spring is provided between the pre-tightening baffle 11 and the bottom of the pre-tightening slot 7-3. The pre-tightening baffle spring causes the pre-tightening baffle 11 to extend into the axial through hole of the first section 1-1 and can retract inward when compressed.

[0086] Combination Figure 2 A portion of the torsion spring 8 is housed within the intermediate section 2-1, including the spring body 8-3 and the torsion spring head end 8-1 and torsion spring tail end 8-2 located at one end respectively. The torsion spring tail end 8-2 is inserted into the torsion spring fixing slot 2-5, and the torsion spring head end 8-1 extends into the first section 1-1 and is inserted into the upper spring slot 5-6. Figure 9 This is a schematic diagram of the upper washer structure of the hinge of the present invention. Figure 10This is a schematic diagram of the lower washer structure of the hinge of the present invention; the upper washer 9 is sleeved on the outer periphery of the torsion spring 8 and located between the first section 1-1 and the middle section 2-1, and the lower washer 10 is sleeved on the outer periphery of the hydraulic sleeve 6 and located between the second section 1-2 and the middle section 2-1. The rotational friction between the first section 1-1, the second section 1-2 and the middle section 2-1 is avoided by the upper washer 9 and the lower washer 10. Specifically, the upper gasket 9 is a stepped ring with two different outer diameters. During installation, its smaller outer diameter portion mates with the inner surface of the through hole in the first section 1-1, while its larger outer diameter portion matches the overall outer diameter of the hinge cylinder. Simultaneously, the entire structure is clamped and fixed by the first section 1-1 and the intermediate section 2-1. Its inner diameter portion is slightly larger than the outer diameter of the torsion spring 8, preventing the torsion spring 8 from shifting left or right during hinge opening or closing. A lower gasket 10 is provided between the second section 1-2 and the intermediate section 2-1. The lower gasket 10 is a stepped ring with two different outer diameters. During installation, its inner diameter matches the outer diameter of the hydraulic sleeve 6, while its larger outer diameter portion matches the overall outer diameter of the hinge cylinder. Simultaneously, the entire structure is clamped and fixed by the second section 1-2 and the intermediate section 2-1, while its smaller outer diameter portion mates with the inner surface of the through hole in the second section 1-2.

[0087] Figure 11 This is a schematic diagram of the pre-tightening baffle structure of the hinge of the present invention. The pre-tightening baffle 11 includes a pre-tightening baffle body 11-1 and a pre-tightening baffle head end 11-2. The pre-tightening baffle groove cover 7 fixes the pre-tightening baffle 11 in the pre-tightening slot 7-3. The pre-tightening baffle head end 11-2 extends into the interior of the first section 1-1.

[0088] Figures 12a-14 The individual components of the hinge buffer and their mutual mounting relationships are shown separately. First, refer to... Figure 12a , Figure 12b The main body of the rotating motion component 13 is a cylindrical inner rotating shaft 13-3. The cylindrical inner rotating shaft 13-3 has integrally formed mating parts on both sides in a centrally symmetrical manner. The outer surface of the mating part is a rotating contact surface 13-2 adapted to the inner diameter of the large inner diameter section of the hydraulic sleeve 6. Preferably, the rotating contact surface 13-2 is an arc surface that cuts off a portion of the cylindrical surface. The bottom surface of the mating part is an inclined surface or a spiral surface, and a ball groove 13-4 is formed on the bottom surface of the mating part. (See [reference]). Figure 13 The ball groove 13-4 is used to install the ball 14; the upper end face of the inner rotating shaft 13-3 is the upper welding surface 13-1 of the rotating component, which is fixedly welded to the lower end face of the circular welding rib plate 2-4 to fix the rotating motion component 13 and the intermediate section 2-1 in a relatively fixed manner. When the right-hand hinge assembly 2 rotates, the rotating motion component 13 also rotates.

[0089] Located below the rotary motion component 13 and installed inside the large-diameter section of the hydraulic sleeve 6, the linear motion component 19 is used to compress the hydraulic damper 20. See [link / reference]. Figure 13 , Figure 14 ,as well as Figure 19a , 19b The linear motion component 19 is a hollow cylindrical structure with a closed bottom surface, forming the bottom end face 19-1. The bottom end face 19-1 contacts the hydraulic damper piston rod 20-2 of the hydraulic damper 20, compressing the hydraulic damper piston rod 20-2 as the linear motion component 19 moves downwards. Two centrally symmetrical helical cut surfaces are cut into the sidewall of the hollow cylindrical structure. Each helical cut surface has a ball bearing slide 19-2, which accommodates balls 14 that slide up and down along the helical cut surface. An integrally formed motion slide groove 19-3 extending axially is also formed on the side of the linear motion component 19. The motion slide groove 19-3 engages with the internal slide 6-1 of the hydraulic sleeve, ensuring that the linear motion component 19 can only move axially up and down within the hydraulic sleeve 6, thereby forcing the hydraulic damper piston rod 20-2 to retract or release.

[0090] The hydraulic damper 20 is installed in the small inner diameter section of the hydraulic sleeve 6, see [reference]. Figure 20 The hydraulic damper body 20-1 is housed inside the small inner diameter section, and the hydraulic damper piston rod 20-2 extends upward and abuts against the bottom end face 19-1 of the linear motion component. The ball 14 is partially housed in the ball groove 13-4 of the rotary motion component 13 and partially housed in the ball slide 19-2 of the linear motion component 19. When the rotary motion component 13 rotates with the intermediate section 2-1, the mating part of the rotary motion component 13 acts on the ball 14, causing the ball 14 to slide up and down along the ball slide 19-2, thereby pushing the linear motion component 19 to move up and down inside the hydraulic sleeve 6.

[0091] Figures 15a-15c The structure of the left partition 15 is shown. Specifically, the left partition 15 has the same overall size as the left fixed hinge assembly 1 and is used to cover the internal support structure of the left fixed hinge assembly 1. To reduce weight, it can have a grid-type structure on one side and a flat outer contact surface 15-1 on the other side. The outer contact surface 15-1 of the left partition is opposite to the left baffle 17. At the same time, a left countersunk hole 15-3 is opened on the left partition 15. During installation, the hexagon countersunk screw 22 passes through the left countersunk hole 15-3 and is screwed into the threaded hole on the left boss 1-5. It cooperates with the two left connecting post holes 15-2 on the left partition 15 through which the left connecting post 1-4 passes to form a triangle to fix the left partition 15 to the left fixed hinge assembly 1. Figure 17a , 17bThe structure of the left baffle is shown. The left baffle 17 is provided with two countersunk holes 17-1 that correspond one-to-one with the left connecting post 1-4. During installation, two hexagon countersunk screws 21 pass through the countersunk holes 17-1 and are screwed onto the left connecting post 1-4 to fix the left baffle 17 to the left fixed hinge assembly 1.

[0092] The right partition 16 and the left partition 15 have essentially the same or completely identical structures, and the right baffle 18 and the left baffle 17 have essentially the same or completely identical structures. See [link to relevant documentation] for details. Figures 16a-16c and Figure 18a , 18b The right partition 16 has the same overall size as the right rotating hinge assembly 2, and is used to cover the internal support structure of the right rotating hinge assembly 2. At the same time, the right partition 16 has a right countersunk hole 16-3. During installation, the second hexagon countersunk screw 22 passes through the right countersunk hole and is screwed into the threaded hole on the right boss 2-3. Together with the two right connecting post holes 16-2 on the right partition 16 through which the right connecting post 2-2 passes, they form a triangle to fix the right partition 16 to the right rotating hinge assembly 2. The right baffle 18 has two right baffle countersunk holes 18-1 corresponding to the right connecting post 2-2. During installation, the two hexagon countersunk screws 21 pass through the right baffle countersunk holes 18-1 and are screwed onto the right connecting post 2-3 to fix the right baffle 18 to the right rotating hinge assembly 2. Similarly, the side of the right partition 16 opposite to the right baffle 18 is set as the flat outer contact surface 16-1 of the right partition. When the hinge is closed, the inner contact surface 17-2 of the left baffle and the inner contact surface 18-2 of the right baffle are in contact with each other and closed together.

[0093] A gasket-connecting column sleeve-partition structure is provided between the left baffle 17 and the left partition 15. Specifically, in conjunction with... Figure 21a , Figure 21b and Figure 22 The rubber gasket 25 has the same overall dimensions as the left baffle 17 and the left partition 15, and has a gasket connecting post hole 25-1 for the left connecting post 1-4 to pass through. When the hinge is working, the rubber gasket 25 is in close contact with the inner side of the left baffle 17. The connecting post sleeve 12 is a cylindrical structure with an axial opening. The size of this opening is the same as the outer size of the left connecting post 1-4. When the hinge is working, it is positioned between the gasket and the left partition. The space between the rubber gasket 25 and the left partition 15, excluding the connecting post sleeve 12, is the working space for the object held by the hinge. Similarly, there is also a gasket-connecting post sleeve-partition structure between the right baffle 18 and the right partition 16. Its specific implementation is the same as the left part, and the space between the rubber gasket 25 and the right partition 16, excluding the connecting post sleeve 12, is the working space for the object held by the hinge.

[0094] like Figure 2 As shown, the working principle of the hinge is as follows:

[0095] (a) When the left fixed hinge assembly 1 and the right rotating hinge assembly 2 are in the same horizontal position, i.e., in the closed state, the torsion spring 8 has an initial torsion angle and stores initial torsion energy. The initial torque of the torsion spring 8 can be enhanced by adjusting the initial torsion angle. The specific implementation method is as follows: The top of the upper shaft cover 5 has an upper shaft cover hexagonal groove 5-7. The rotation is achieved by using a hexagonal wrench, which causes the upper spring slot 5-6 to drive the first end 8-1 of the torsion spring to rotate, thereby increasing the initial torsion angle of the torsion spring 8. When the hinge is in the closed state, the hydraulic damper 20 is in the compressed state. The initial torque of the torsion spring is transmitted to the rotating motion component 13 through the torsion spring fixing slot 2-5 on the right rotating hinge assembly 2, and then acts on the hydraulic damper 20 through the ball 14 and the linear motion component 19. Finally, the axial component force acting on the hydraulic damper 20 is greater than the rebound force of the hydraulic damper 20, thereby keeping the hydraulic damper 20 in the compressed state and ensuring the stability of the hinge in the closed state.

[0096] (b) When the right-hand hinge assembly 2 rotates outward, i.e. the hinge opens, it drives the torsion spring 8 to rotate in the direction of increasing torque through the upper spring slot 5-6, increasing the degree of torsion of the torsion spring 8. At this time, the rotating motion component 13 also rotates under the drive of the circular welded stiffener 2-4, driving the linear motion component 19 to move upward. The constraint of the bottom of the linear motion component 19 on the hydraulic damper 20 is gradually released, so that the hydraulic damper piston rod 20-2 gradually extends along the axial direction. When the left baffle 17 and the right baffle 18 are opened and closed to the maximum angle, the hydraulic damper piston rod 20-2 is fully extended.

[0097] (c) When the hinge is in the open state, its closing process is spontaneous, as described below:

[0098] When the hinge is fully open, the torsion spring 8 has a greater rebound force than the initial torque, causing the right-hand hinge assembly 2 to rotate in the direction of hinge closure under the action of the rebound force and return to the closed state. When the initial horizontal position is reached, the rubber shock-absorbing boss 15-4 on the left partition plate comes into contact with the right partition plate 16. The hydraulic damper piston rod 20-2 eventually retracts gradually under the action of the rebound force along the axial direction. The reaction force of the hydraulic damper 20 plays a buffering role in this process, which can effectively avoid impact.

[0099] The following instructions are provided regarding the assembly process of the hinge:

[0100] (a) First, insert the small outer diameter portion of the upper shim 9 into the upper axial opening of the middle section 2-1 of the right-turn hinge assembly 2 and fit it tightly against the inner wall of the middle section 2-1. Then, insert the small outer diameter portion of the lower shim 10 into the lower axial opening of the middle section 2-1 of the right-turn hinge assembly 2 and fit it tightly against the inner wall of the middle section 2-1. Then, align the large outer diameter portions of the upper shim 9 and the lower shim 10 with the first section 1-1 and the second section 1-2 of the left fixed hinge assembly 1, respectively. Based on this, insert the middle section 2-1 of the right-turn hinge assembly 2 between the first section 1-1 and the second section 1-2 of the left fixed hinge assembly 1 and align the outer diameters to form a hinge cylinder.

[0101] (b) Place the hydraulic damper 20 into the hydraulic damper fixing position 6-2 on the hydraulic sleeve 6, then align the recessed part of the motion slide groove 19-3 on the linear motion component 19 with the protruding part of the slide 6-1 inside the hydraulic sleeve, and slowly insert the linear motion component 19 into the hydraulic sleeve 6 until the bottom end face 19-1 of the linear motion component contacts the piston rod 20-2 of the hydraulic damper, and then slide the two balls 14 along the ball slide 19-3 on the linear motion component 19 until they contact the bottom of the linear motion component;

[0102] (c) Insert the torsion spring 8 into the hinge cylinder from top to bottom, ensuring that the tail end 8-2 of the torsion spring is engaged in the torsion spring fixing groove 2-5 on the circular welded stiffener. Then, insert the upper shaft cover 5 into the hinge cylinder from top to bottom, ensuring that the head end 8-1 of the torsion spring is engaged in the upper spring groove 5-6. Adjust the position of the upper shaft cover 5 with a hex wrench so that the first toothed scale groove 5-5 (i.e., when the initial torque of the spring is minimal) is aligned with the pre-tightening baffle hole 1-3 on the left fixed hinge assembly 1, and the pre-tightening groove 7 of the pre-tightening baffle groove cover 7 is aligned with the pre-tightening groove 7. Place the pre-tightening baffle 11 and the pre-tightening baffle spring 12 into the pre-tightening baffle slot 7-3 in sequence. Align the pre-tightening slot 7-3 with the pre-tightening baffle hole 1-3 and slowly push the pre-tightening baffle slot cover 7 into the pre-tightening baffle slot cover 7. Ensure that the first end 11-2 of the pre-tightening baffle can be correctly inserted into the first toothed scale slot 5-5. Snap the pre-tightening baffle slot cover 7 into the pre-tightening baffle slot cover clip 1-7 on the left fixed hinge assembly 1. Then, screw the pre-tightening baffle slot cover fixing screw 24 into the slot cover threaded through hole 7-2 and the pre-tightening baffle slot cover fixing hole 1-6 on the left fixed hinge assembly 1 in sequence.

[0103] (d) Rotate the right hinge assembly 2 outward to bring the hinge to its maximum opening angle. Insert the hydraulic sleeve assembly structure described in (b) into the hinge cylinder from bottom to top. Rotate the hydraulic sleeve structure so that the two balls 14 at the bottom of the ball slide 19-3 on the linear motion component 19 can cooperate with the ball groove 13-4 on the lower side of the rotating motion component 13. After ensuring that the lower end is flush, screw the hydraulic sleeve fixing pin 23 into the hydraulic sleeve fixing through hole 1-8 on the second section 1-2 of the left fixed hinge and the hydraulic sleeve limiting hole 6-3 above the hydraulic sleeve base 6-4 in sequence. Fix the hydraulic sleeve 6 on the left fixed hinge assembly 1.

[0104] (e) Make the left partition 15 fit snugly against the left fixed hinge assembly 1 in the direction visible from the countersunk hole, and align the edges of the left fixed hinge assembly 1 and the left partition 15. At this time, the two left connecting posts 1-4 should pass through the two left connecting post holes 15-2. Then, screw the second hexagon countersunk screw 22 into the left countersunk hole 15-3 and the left boss 1-5 below it in sequence. Place the rubber gasket 25 on the connecting post sleeve 12 with the left connecting post 1-4 passing through the gasket connecting post hole 25-1. Finally, align the two left baffle countersunk holes 17-1 on the left baffle 17 with the left connecting post 1-4. After ensuring that the edges are flush with the left fixed hinge assembly 1, screw the first hexagon countersunk screw 21 into the two pairs of left baffle countersunk holes 17-1 and the left connecting post 1-4 in sequence.

[0105] (f) Ensure that the right partition 16 is flush against the right-hand hinge assembly 2 in the direction visible from the countersunk hole, and align the edges of the right-hand hinge assembly 2 and the right partition 16. At this point, the two right connecting posts 2-2 should pass through the two right connecting post holes 16-2. Then, screw the second hexagon countersunk screw 22 into the right countersunk hole 16-3 and the right boss 2-3 below it in sequence. Place the rubber gasket 25 on the connecting post sleeve 12 with the right connecting post 2-2 passing through the gasket connecting post hole 25-1. Finally, align the two right baffle countersunk holes 18-1 on the right baffle 18 with the right connecting post 2-2. After ensuring that the edges are flush with the right-hand hinge assembly 2, screw the first hexagon countersunk screw 21 into the two pairs of right baffle countersunk holes 18-1 and the right connecting post 2-2 in sequence.

[0106] The mounting position of the parts can be described as follows:

[0107] (a) As shown in Figure 1, the left fixed hinge assembly 1 has a first section 1-1 and a second section 1-2, and the right rotating hinge assembly 2 has a middle section 2-1. After assembly (as shown in Figure 1), the three sections are in a coaxial state and form a hinge cylinder structure.

[0108] (b) such as Figure 2 As shown in Figure 5, the upper part of the hinge cylinder has an upper shaft cover 5. The upper shaft cover 5 includes an upper shaft cover head 5-2, an upper shaft cover neck 5-3, and an upper shaft cover neck 5-4, with the upper shaft cover neck 5-4 protruding into the intermediate section 2-1. Furthermore, the lower part of the hinge cylinder has a hydraulic sleeve 6, as shown in Figure 6. The hydraulic sleeve 6 includes a hydraulic sleeve body and a hydraulic sleeve base 6-4, with the hydraulic sleeve body extending through the second section 1-2 and protruding into the intermediate section 2-1. Figure 9 and Figure 10As shown, there are both an upper washer 9 and a lower washer 10. The upper washer 9 is installed between the first section 1-1 and the middle section 2-1, so that the first section 1-1 and the middle section 2-1 can rotate relative to each other, while ensuring that the torsion spring 8 does not undergo lateral displacement. The lower washer 10 is installed between the second section 1-2 and the middle section 2-1, so that the second section 1-2 and the middle section 2-1 can rotate relative to each other, while ensuring that the hydraulic sleeve 6 does not undergo lateral displacement.

[0109] (c) As shown in Figure 1 or Figure 2 As shown, the upper shaft cover 5 has a hexagonal groove 5-7 located at the upper shaft cover head 5-2 to receive an internal hex wrench. Specifically, the upper shaft cover 5 can be rotated by the rotation of the internal hex wrench, thereby driving the torsion spring head 8-1 of the torsion spring 8 to rotate through the upper spring retainer groove 5-4. At this time, the torsion spring tail 8-2 is fixed by the torsion spring fixing groove 2-5 on the circular welded rib plate 2-4 inside the middle section 2-1 of the right-hand hinge assembly 2, so that the torsion spring head 8-1 can rotate when the torsion spring tail 8-2 is stationary. As shown in Figure 5, the outer circumferential cylindrical surface of the upper shaft cover neck 5-3 has evenly distributed toothed scale grooves 5-5. The upper shaft cover 5 can be rotated by a hex wrench to align and fix a certain toothed scale groove with the pre-tightening baffle 11. Figure 5a As shown, the toothed scale grooves correspond one-to-one with the scale indicator lines 5-1 on the upper shaft cover head 5-2. The torsion angle of the torsion spring 8 can be determined by the scale. The initial torque stored in the torsion spring 8 is also different depending on the torsion angle.

[0110] (d) A left partition 15 and a left baffle 17 are installed after the left fixed hinge assembly 1. As shown in Figure 15, the left partition 15 can be divided into a main body and an impact-relief boss 15-4. Its overall size is the same as that of the left fixed hinge assembly 1, and it is used to cover the internal support structure of the left fixed hinge assembly 1. At the same time, the left partition 15 has a left countersunk hole 15-3, which corresponds to the hole on the left boss 1-6 on the left fixed hinge assembly 1, and is connected by a countersunk head screw 22. As shown in Figure 17, the overall size of the left baffle 17 is the same as that of the left hinge assembly 1. At the same time, the left baffle 17 has a left baffle countersunk hole 17-1, which corresponds to the hole on the left connecting post 1-4 of the left fixed hinge assembly 1, and is connected by a countersunk head screw 21.

[0111] (e) A right partition 16 and a right baffle 18 are installed after the right-hand hinge assembly 2. As shown in Figure 16, the overall dimensions of the right partition 16 are the same as those of the right-hand hinge assembly 2, and it is used to cover the internal support structure of the right-hand hinge assembly 2. The right partition 16 also has a right countersunk hole 16-3, which corresponds to the hole on the right boss 2-3 on the right-hand hinge assembly 2, and is connected by a countersunk head screw 22. As shown in Figure 18, the overall dimensions of the right baffle 18 are the same as those of the right-hand hinge assembly 2, and the right baffle 18 has a right baffle countersunk hole 18-1, which corresponds to the hole on the right connecting post 2-2 on the right-hand hinge assembly 2, and is connected by a countersunk head screw 21.

[0112] (f) As shown in Figure 21 and Figure 22 As shown, between the left partition 15 and the left baffle 17, and between the right partition 16 and the right baffle 18, there is also a structure of gasket-connecting column sleeve-partition. Specifically, the overall size of the rubber gasket 25 is the same as that of the left fixed hinge assembly 1 (right rotating hinge assembly 2), and the opening size of the connecting column sleeve 12 is the same as that of the left connecting column 1-4 (right connecting column 2-2). In the gap between the left partition 15 (right partition 16) and the left baffle 17 (right baffle 18), each left connecting column 1-4 (right connecting column 2-2) passes sequentially through the left connecting column hole 15-2 (right connecting column hole 16-2), the connecting column sleeve 12, and the gasket connecting column hole 25-1.

[0113] (g) For the pre-tightening baffle 11 that mates with the toothed scale groove 5-5 described in (c), it is placed in the pre-tightening slot 7-3 of the pre-tightening slot cover 7 and can move along the slot. Specifically, there is a pre-tightening baffle spring at the rear part coaxial with the pre-tightening baffle 11. Both are covered by the pre-tightening baffle slot cover 7. The pre-tightening baffle slot cover 7 is engaged below the pre-tightening baffle slot cover clip 1-7 on the left fixed hinge assembly 1 and is fixed to the left fixed hinge assembly 1 by the pre-tightening baffle slot cover fixing screw 24.

[0114] (h) such as Figure 6bAs shown, the hydraulic damper fixing groove 6-2 of the hydraulic sleeve 6 is used to place the hydraulic damper 20, and the internal slide 6-2 of the hydraulic sleeve is used to cooperate with the motion slide groove 19-3 of the linear motion component 19, so that the linear motion component 19 can move vertically without deviating from the predetermined track. The rotary motion component 13, the ball bearing 14, the linear motion component 19, the hydraulic sleeve 6, and the hydraulic damper 20 together form the lower half of the rotating shaft inside the hinge cylinder. Specifically, when the right-hand hinge assembly 2 reaches its maximum opening angle, the hydraulic damper piston rod 20-2 of the hydraulic damper 20 is in a free, uncompressed state. The linear motion component 19 moves to the bottom of the inner slide 6-2 of the hydraulic sleeve, and the ball bearing 14 is located at the lowest point of the ball bearing slide 19-3. At this time, the hydraulic sleeve 6 is inserted and the hydraulic sleeve fixing hole 6-3 is aligned with the hydraulic sleeve fixing hole 1-8 on the second section 1-2 of the left fixed hinge assembly. Then, the ball bearing 14 can just fit into the ball bearing groove 13-4 on the rotary motion component 13. When the hinge opens from the closed state, the right-hand hinge assembly 2 drives the rotary motion component 13 to rotate. The ball bearing 14 gradually moves from the highest point to the lowest point along the ball bearing slide 19-3. Under the extension and retraction of the hydraulic damper piston rod 20-2, the linear motion component 19 moves upward until the hinge is fully open and reaches the highest point of the inner slide 6-1 of the hydraulic sleeve.

[0115] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A coaxial, low-noise, smooth-smooth, soft-rebound torsion spring hinge, characterized in that, The device includes a left fixed hinge assembly and a right rotating hinge assembly. The left fixed hinge assembly includes a main body and a first section and a second section with axial through holes formed at the upper and lower ends of one side of the main body. The right rotating hinge assembly includes a main body and an intermediate section with an axial through hole formed in the middle of one side of the main body. The intermediate section extends between the first section and the second section. The first section, the intermediate section, and the second section together constitute a hinge cylinder with an internal axial through hole running vertically through it. A circular welded rib plate is fixed or integrally formed inside the axial through hole of the intermediate section. A torsion spring fixing groove is fixed on the upper surface of the circular welded rib plate, and a rotating motion component is fixed on the lower surface of the circular welded rib plate. An upper shaft cover is installed on the upper part of the hinge cylinder and inside the first section. An upper spring groove is formed on the lower surface of the upper shaft cover. A torsion spring is also installed inside the hinge cylinder. The upper and lower ends of the torsion spring are fixed by the upper spring groove and the torsion spring fixing groove, respectively. A hydraulic sleeve is installed at the lower part of the hinge cylinder. The hydraulic sleeve is fixedly housed in the second section and extends into the middle section. A hydraulic damper is installed inside the hydraulic sleeve. A linear motion component is provided between the hydraulic damper and the rotary motion component. The end face of the linear motion component away from the rotary motion component abuts against the piston rod of the hydraulic damper. Under the drive of the rotary motion component, the linear motion component moves only axially up and down within the hydraulic sleeve. The upper shaft cover includes a circular upper shaft cover head and two upper shaft cover necks with cylindrical contours. The upper shaft cover head, upper shaft cover neck one, and upper shaft cover neck two are coaxially arranged. Positioning structures are evenly distributed on the periphery of the upper shaft cover neck one, and the upper spring slot is formed on the end face of the upper shaft cover neck two. The back of the left fixed hinge assembly also has an installation space for installing a pre-tightening baffle cover. A pre-tightening baffle cover fixing hole and a pre-tightening baffle cover clip protruding from the left fixed hinge assembly toward the installation space are formed in the installation space. The pre-tightening baffle cover is installed on the left fixed hinge assembly by the pre-tightening baffle cover fixing screw cooperating with the pre-tightening baffle cover fixing hole. The edge of the pre-tightening baffle cover is limited by the pre-tightening baffle cover clip to lock the position of the pre-tightening baffle cover. The first section has a pre-tightening baffle hole that penetrates its side wall and connects to the installation space of the pre-tightening baffle groove cover. An elastically retractable pre-tightening baffle is installed inside the pre-tightening baffle groove cover. The pre-tightening baffle passes through the pre-tightening baffle hole and extends into the axial through hole of the first section to cooperate with the positioning structure on the circumferential side of the upper shaft cover neck, so as to circumferentially adjust and lock the position of the upper shaft cover.

2. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 1, characterized in that, The main body of the rotating motion component is a cylindrical inner rotating shaft. The inner rotating shaft has mating parts formed on both sides in a centrally symmetrical manner. The outer surface of the mating part is an arc surface that matches the inner circumferential surface of the hydraulic sleeve. A ball groove is formed on the lower end surface of the mating part away from the circular welded stiffener plate. The linear motion component is a hollow columnar structure with its bottom surface closed to abut against the piston rod of the hydraulic damper. Two centrally symmetrical spiral cut surfaces are cut into the side wall of the hollow columnar structure, and ball bearing slides are provided on each spiral cut surface. It also includes a ball bearing, the upper part of which is accommodated in the ball bearing groove and the lower part of which is accommodated in the ball bearing slide. The rotary motion component drives the ball bearing to roll and slide up and down along the spiral cross-section in the ball bearing slide, thereby driving the linear motion component to move up and down.

3. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 1, characterized in that, The positioning structure consists of toothed scale grooves evenly distributed around the neck of the upper shaft cover. The upper shaft cover has scale indicator lines evenly distributed around its circumference. The toothed scale grooves and the scale indicator lines correspond one-to-one in axial position.

4. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 1, characterized in that, The second section has a hydraulic sleeve fixing hole that penetrates its side wall. The side wall of the hydraulic sleeve is provided with a hydraulic sleeve limiting hole. The hydraulic sleeve fixing pin passes through the hydraulic sleeve fixing hole and extends into the hydraulic sleeve limiting hole to lock the relative position of the hydraulic sleeve and the second section.

5. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 1 or 3, characterized in that, The linear motion component has a motion slide groove extending axially on its side, and an internal slide of the hydraulic sleeve extending axially is formed on the inner circumferential surface of the hydraulic sleeve. The motion slide groove and the internal slide of the hydraulic sleeve form a keyway limiting fit, so that the linear motion component can only move axially up and down inside the hydraulic sleeve.

6. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 1, characterized in that, It also includes a left partition and a left baffle, wherein the left fixed hinge assembly, the left partition, and the left baffle are stacked and assembled in sequence; a left connecting post and a left boss are formed on the mating surface of the left fixed hinge assembly and the left partition, and screw holes are provided on the left connecting post and the left boss; a left connecting post hole for the left connecting post to pass through is provided on the left partition, and a left countersunk hole corresponding to the position of the screw hole on the left boss and penetrating the left partition is provided on the left baffle; a left baffle countersunk hole corresponding to the position of the screw hole on the left connecting post and penetrating the left baffle is formed on the left baffle. It also includes a right partition and a right baffle, wherein the right rotating hinge assembly, the right partition, and the right baffle are stacked and assembled in sequence; a right connecting post and a right boss are formed on the mating surface of the right rotating hinge assembly and the right partition, and screw holes are provided on the right connecting post and the right boss; the right partition has a right connecting post hole for the right connecting post to pass through, and a right countersunk hole corresponding to the position of the screw hole on the right boss and penetrating the right partition; the right baffle has a right baffle countersunk hole corresponding to the position of the screw hole on the right connecting post and penetrating the right baffle.

7. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 6, characterized in that, The left baffle and the left partition form a gasket-connecting column sleeve-partition structure, including a rubber gasket and a connecting column sleeve. The rubber gasket is set close to the inner side of the left baffle, and the rubber gasket has a gasket connecting column hole for the left connecting column to pass through. The connecting column sleeve is located between the rubber gasket and the left partition and is fitted on the left connecting column to form a working space for clamping objects between the rubber gasket and the left partition. A gasket-connecting column sleeve-partition structure is also provided between the right baffle and the right partition, and the arrangement is the same as that between the left baffle and the left partition.

8. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 3, characterized in that, The protrusion between two of the circumferentially distributed toothed grooves serves as a circumferential limiting baffle to limit the maximum adjustment value of the initial restoring force of the torsion spring; a hexagonal groove for the upper shaft cover is also provided in the middle of the end face of the upper shaft cover head.

9. The coaxial low-noise smooth-smooth soft-rebound torsion spring hinge according to claim 5, characterized in that, The internal space of the hydraulic sleeve is divided into a large inner diameter section and a small inner diameter section by a stepped surface. The small inner diameter section forms the fixed position of the hydraulic damper, and its inner diameter is adapted to the outer diameter of the hydraulic damper so that the hydraulic damper can be installed inside the hydraulic sleeve. The large inner diameter section is connected to the open end of the hydraulic sleeve, and the internal slide of the hydraulic sleeve is provided on the side wall of the large inner diameter section.

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