Functional axis and hinge device

Abstract

The present application relates to a functional shaft and hinge device. The functional shaft includes a first rotating sleeve, a second rotating sleeve, a return spring, a needle roller assembly, and a damping structure. The first rotating sleeve is provided with a first spiral groove and a second spiral groove, and the second rotating sleeve is provided with a first linear groove and a second linear groove. The second rotating sleeve is rotatably sleeved on the outer circumference of the first rotating sleeve and is arranged coaxially with the first rotating sleeve. One end of the needle roller assembly is movably inserted through the first spiral groove and the first linear groove, and the other end is movably inserted through the second spiral groove and the second linear groove. The damping structure applies a damping force to the needle roller assembly along a preset axial direction. The return spring is provided at the end of the needle roller assembly away from the damping structure. When the return spring pushes the needle roller assembly along the preset axial direction toward the damping structure, the needle roller assembly can drive the second rotating sleeve to rotate about the preset axial direction. The functional shaft and hinge device provided by the present application solve the problem of complex hydraulic hinge structures.

Description

Technical Field

[0001] The present application relates to the field of hinge technology, and in particular to a functional shaft and a hinge device. Background Art

[0002] To avoid damage to the door or wall caused by traditional door closers, hydraulic hinges are now commonly used instead. Specifically, the hydraulic hinge drives the functional shaft to rotate synchronously during rotation. This shaft also provides a certain degree of hydraulic damping for the hinge's rotation, preventing the door from closing too quickly and potentially damaging the door frame or wall. Existing hydraulic hinges generally require a gear transmission mechanism, resulting in a complex structure and high manufacturing costs. Summary of the Invention

[0003] Based on this, it is necessary to provide a functional shaft and hinge device to solve the problem of complex structure of existing hydraulic hinges.

[0004] The functional shaft provided by the present application includes a first rotating sleeve, a second rotating sleeve, a return spring, a needle roller assembly and a damping structure, the side wall of the first rotating sleeve is provided with a first spiral groove and a second spiral groove extending spirally around its own axial direction, respectively, the side wall of the second rotating sleeve is provided with a first linear groove and a second linear groove extending along its own axial direction, respectively, the second rotating sleeve is rotatably sleeved on the outer circumference of the first rotating sleeve and is coaxially arranged with the first rotating sleeve; the needle roller assembly is movably connected to the first rotating sleeve, and one end of the needle roller assembly is movably inserted into the first spiral groove and the first linear groove, and the other end is movably inserted into the second spiral groove and the second linear groove; the axial direction of the first rotating sleeve and the axial direction of the second rotating sleeve are defined as preset axial directions, the damping structure is provided at one end of the needle roller assembly to apply a damping force to the needle roller assembly along the preset axial direction; the return spring is provided at the end of the needle roller assembly away from the damping structure, and when the return spring pushes the needle roller assembly to move along the preset axial direction toward the damping structure, the needle roller assembly can drive the second rotating sleeve to rotate around the preset axial direction.

[0005] In one embodiment, the damping structure includes a valve needle, a piston and a cylinder. The cylinder is provided with a cavity, and oil is provided in the cavity. The piston is movably arranged in the cavity to separate the cavity into a first cavity and a second cavity, and a flow gap is provided between the outer peripheral side of the piston and the inner wall of the cylinder. One end of the valve needle is fixedly connected to the piston, and the other end can movably pass through the first cavity and extend out of the cylinder; when the needle roller assembly pushes the valve needle and the piston toward the end away from the return spring, the oil in the second cavity can enter the first cavity through the flow gap.

[0006] In one embodiment, the inner diameter of the cavity at an end away from the return spring is larger than the inner diameter of the cavity at an end close to the return spring.

[0007] In one embodiment, the cavity includes a large diameter cavity and a small diameter cavity, the diameter of the large diameter cavity is larger than the diameter of the small diameter cavity, and the large diameter cavity is arranged at the end of the cavity away from the return spring, and the small diameter cavity is arranged at the end of the cavity close to the return spring.

[0008] In one embodiment, the inner diameter of the cavity gradually increases along the direction from the return spring to the damping structure.

[0009] In one embodiment, the damping structure further includes a damping spring, which is disposed in the second cavity and can apply an elastic force on the piston toward the return spring.

[0010] In one embodiment, the functional shaft also includes a stroke adjustment member, which is arranged at the end of the damping structure away from the return spring. One end of the stroke adjustment member is connected to the first rotating sleeve, and the other end is connected to the end of the cylinder away from the return spring. The stroke adjustment member can push the damping structure to move along a preset axial direction in the first rotating sleeve.

[0011] In one embodiment, the functional shaft also includes an elastic adjustment member, which is arranged at one end of the return spring away from the damping structure. One end of the elastic adjustment member is connected to the first rotating sleeve, and the other end is connected to the end of the return spring away from the damping structure to adjust the compression amount of the return spring.

[0012] In one embodiment, the needle roller assembly includes a main body and a needle body. The main body is arranged in a first rotating sleeve and coaxially with the first rotating sleeve. The needle body is fixedly inserted into the main body along the radial direction of the first rotating sleeve and extends out from both ends of the main body. One end of the needle body is movably inserted into the first spiral groove and the first linear groove, and the other end is movably inserted into the second spiral groove and the second linear groove.

[0013] The present application also provides a hinge device, which includes a first rotating blade, a second rotating blade and the functional shaft described in any one of the above embodiments, the first rotating blade is fixedly sleeved on the outer peripheral side of the first rotating sleeve, and the second rotating blade is fixedly sleeved on the outer peripheral side of the second rotating sleeve.

[0014] Compared with the prior art, the functional shaft and hinge device provided in the present application, in the functional shaft of the present application, can realize the rotation of the functional shaft and the hinge device through the cooperation of the needle roller assembly and the first rotating sleeve, and the cooperation of the second rotating sleeve of the needle roller assembly, without the need to set up a gear transmission structure separately, thereby greatly simplifying the structure of the functional shaft and reducing the manufacturing cost of the functional shaft.

[0015] Furthermore, a more ingenious point of the present application is that the first rotating sleeve is provided with a first spiral groove and a second spiral groove extending spirally around its own axial direction, and the second rotating sleeve is provided with a first linear groove and a second linear groove extending respectively along its own axial direction. In this way, when the first rotating sleeve and the second rotating sleeve rotate relative to each other, the needle roller assembly can simultaneously adapt to the first spiral groove and the second spiral groove on the first rotating sleeve and the first linear groove and the second linear groove on the second rotating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of a hinge device according to an embodiment of the present application;

[0018] Figure 2 Decomposition of the hinge device of one embodiment provided in this application Figure 1 ;

[0019] Figure 3 Decomposition of the hinge device of one embodiment provided in this application Figure 2 ;

[0020] Figure 4 A cross-sectional view of a damping structure according to an embodiment of the present application.

[0021] Figure numerals: 100, first rotating sleeve; 110, first section; 120, second section; 121, first spiral groove; 122, second spiral groove; 200, second rotating sleeve; 210, first linear groove; 300, return spring; 400, needle roller assembly; 410, main body; 420, needle body; 500, damping structure; 510, valve needle; 520, piston; 530, cylinder; 531, first chamber; 532, second chamber; 540, damping spring; 600, first rotating blade; 700, second rotating blade; 800, first decorative cover; 900, second decorative cover. DETAILED DESCRIPTION

[0022] To avoid damage to the door or wall caused by traditional door closers, hydraulic hinges are now commonly used instead. Specifically, the hydraulic hinge drives the functional shaft to rotate synchronously during rotation. This shaft also provides a certain degree of hydraulic damping for the hinge's rotation, preventing the door from closing too quickly and potentially damaging the door frame or wall. Existing hydraulic hinges generally require a gear transmission mechanism, resulting in a complex structure and high manufacturing costs.

[0023] See also Figures 1-4 In order to solve the problem of complex structure of existing hydraulic hinges, the present application provides a functional shaft and hinge device, which includes a first rotating sleeve 100, a second rotating sleeve 200, a return spring 300, a needle roller assembly 400 and a damping structure 500. The side wall of the first rotating sleeve 100 is provided with a first spiral groove 121 and a second spiral groove 122 respectively extending spirally around its own axis, and the first spiral groove 121 and the second spiral groove 122 are rotationally symmetrically arranged. The side wall of the second rotating sleeve 200 is provided with a first linear groove 210 and a second linear groove (not shown) respectively extending along its own axis, and the first linear groove 210 and the second linear groove are rotationally symmetrically arranged. The second rotating sleeve 200 is rotatably sleeved on the outer peripheral side of the first rotating sleeve 100 and is coaxially arranged with the first rotating sleeve 100. The needle roller assembly 400 is movably connected to the first rotating sleeve 100 , and one end of the needle roller assembly 400 is movably provided in the first spiral groove 121 and the first linear groove 210 , and the other end is movably provided in the second spiral groove 122 and the second linear groove.

[0024] like Figure 3 As shown, specifically, the first rotating sleeve 100 includes a first section 110 and a second section 120 that are fixedly connected (can be screwed or clamped), the needle roller assembly 400, the first spiral groove 121 and the second spiral groove 122 are all arranged in the second section 120, and the return spring 300 is arranged in the first section 110.

[0025] The axial direction of the first rotating sleeve 100 and the axial direction of the second rotating sleeve 200 are defined as the preset axial direction. The damping structure 500 is disposed at one end of the needle roller assembly 400 to apply a damping force along the preset axial direction to the needle roller assembly 400. The return spring 300 is disposed at the end of the needle roller assembly 400 away from the damping structure 500. When the return spring 300 pushes the needle roller assembly 400 along the preset axial direction toward the damping structure 500, the needle roller assembly 400 can drive the second rotating sleeve 200 to rotate about the preset axial direction, thereby causing the first rotating sleeve 100 and the second rotating sleeve 200 to rotate relative to each other, thereby achieving the closing action of the hinge device and the door body.

[0026] That is, the motion trajectory of the needle roller assembly 400 is a composite spiral trajectory that simultaneously moves along a preset axial straight line and rotates around a preset axial direction. When the first rotating sleeve 100 does not rotate and the second rotating sleeve 200 rotates, the trajectory of the needle roller assembly 400 is along the extension direction of the first spiral groove 121 and the second spiral groove 122.

[0027] Furthermore, it is understandable that the combined motion of the needle roller assembly 400 driving the second rotating sleeve 200 to rotate around the preset axis and the linear movement of the needle roller assembly 400 along the first linear groove 210 and the second linear groove is a spiral motion around the preset axis.

[0028] In the functional shaft of the present application, the rotation of the functional shaft and the hinge device can be achieved through the cooperation between the needle roller assembly 400 and the first rotating sleeve 100, as well as the cooperation between the needle roller assembly 400 and the second rotating sleeve 200, without the need to set up a gear transmission structure separately, thereby greatly simplifying the structure of the functional shaft and reducing the manufacturing cost of the functional shaft.

[0029] Furthermore, a more ingenious point of the present application is that the first rotating sleeve 100 is provided with a first spiral groove 121 and a second spiral groove 122 that extend spirally around its own axial direction, and the second rotating sleeve 200 is provided with a first linear groove 210 and a second linear groove that extend respectively along its own axial direction. In this way, when the first rotating sleeve 100 and the second rotating sleeve 200 rotate relative to each other, the needle roller assembly 400 can simultaneously adapt to the first spiral groove 121 and the second spiral groove 122 on the first rotating sleeve 100 and the first linear groove 210 and the second linear groove on the second rotating sleeve 200.

[0030] In one embodiment, if Figure 4 As shown, the damping structure 500 includes a valve needle 510, a piston 520 and a cylinder 530. The cylinder 530 is provided with a cavity, and oil is provided in the cavity. The piston 520 is movably arranged in the cavity to separate the cavity into a first cavity 531 and a second cavity 532, and a flow gap is provided between the outer peripheral side of the piston 520 and the inner wall of the cylinder 530 (not shown in the figure). One end of the valve needle 510 is fixedly connected to the piston 520, and the other end can movably pass through the first cavity 531 and extend out of the cylinder 530.

[0031] When the needle roller assembly 400 pushes the valve needle 510 and the piston 520 to move toward the end away from the return spring 300 , the oil in the second chamber 532 can flow into the first chamber 531 through the flow gap.

[0032] Since the flow gap is arranged between the outer peripheral side of the piston 520 and the inner wall of the cylinder 530, the flow rate of the flow gap is smaller than the flow rate of the cavity. Therefore, the oil in the cavity can have a certain blocking effect on the movement of the piston 520, that is, the damping and buffering effect of the damping structure 500 is realized.

[0033] Furthermore, in one embodiment, Figure 4 As shown, the damping structure 500 further includes a damping spring 540 . The damping spring 540 is disposed in the second cavity 532 , and the damping spring 540 can apply an elastic force to the piston 520 toward the return spring 300 .

[0034] In this way, the damping force of the damping structure 500 on the needle roller assembly 400 can be further increased.

[0035] In the existing technology, the closing speed is mainly adjusted by adjusting the size of the gap in the center hole of the one-way valve by a speed regulating needle to change the flow rate of the hydraulic oil. In this way, the closing speed of the hinge is difficult to control due to improper setting of the speed regulating needle. When the initial closing speed of the hinge is too fast, it is easy to bring safety hazards to people entering and leaving. When the closing speed of the hinge is too slow, it is easy to cause the door body to fail to lock normally.

[0036] In order to solve the problem that the existing hinge cannot take into account both personnel safety and locking convenience, in one embodiment, the inner diameter of the cavity away from the return spring 300 is larger than the inner diameter of the end close to the return spring 300, so that when the piston 520 moves to the end of the cavity away from the return spring 300, the flow rate of the circulation gap increases synchronously.

[0037] With this arrangement, when the door begins to close, the piston 520 is located at the end of the cavity near the return spring 300. Since the inner diameter of the cavity is smaller and the flow rate of the flow gap is smaller, the damping force of the damping structure 500 is greater, and the piston 520 moves more slowly, that is, the door closes more slowly. This helps to prevent the door from impacting people entering or exiting.

[0038] When the door body continues to close and the piston 520 moves to the end of the cavity away from the return spring 300, the inner diameter of the cavity increases and the flow rate of the flow gap increases. At this time, the damping force of the damping structure 500 on the needle roller assembly 400 decreases. Therefore, the movement rate of the piston 520 is accelerated, which increases the closing speed of the door body and is conducive to the normal locking of the door body.

[0039] Specifically, in one embodiment, the cavity includes a large-diameter cavity (not shown) and a small-diameter cavity (not shown), the diameter of the large-diameter cavity is larger than the diameter of the small-diameter cavity, and the large-diameter cavity is arranged at the end of the cavity away from the return spring 300, and the small-diameter cavity is arranged at the end of the cavity close to the return spring 300.

[0040] More specifically, in one embodiment, the axial length of the large-diameter cavity is smaller than the axial length of the small-diameter cavity.

[0041] It should be noted that the first cavity 531 and the second cavity 532 are cavities with changing volumes, which change continuously with the position of the piston 520, while the large-diameter cavity and the small-diameter cavity are fixed cavities and do not change with the position of the piston 520.

[0042] In another embodiment, the inner diameter of the cavity gradually increases along the direction from the return spring 300 to the damping structure 500 .

[0043] In this way, the moving speed of the needle roller assembly 400 can be gradually increased.

[0044] In one embodiment, the functional shaft further includes a stroke adjustment member (not shown), which is disposed at an end of the damping structure 500 away from the return spring 300 , and one end of the stroke adjustment member is connected to the first rotating sleeve 100 , and the other end is connected to an end of the cylinder 530 away from the return spring 300 , so as to push the damping structure 500 to move along a preset axial direction within the first rotating sleeve 100 .

[0045] With this arrangement, the position of the damping structure 500 in the first rotating sleeve 100 can be controlled by the stroke adjusting member, thereby controlling the moving distance of the piston 520 along the preset axial direction, and further controlling the damping force output by the damping structure 500 .

[0046] For example, when the stroke of the piston 520 along the preset axial direction is greater than the strokes of the first spiral groove 121, the second spiral groove 122, the first linear groove 210, and the second linear groove along the preset axial direction, the stroke adjustment member can be used to move the damping structure 500 as a whole away from the return spring 300, so that the entire stroke of the needle roller assembly 400 and the piston 520 is in a slow movement state, thereby reducing the impact force of closing the door. Alternatively, the stroke adjustment member can be used to move the damping structure 500 as a whole toward the return spring 300, so that the second half of the stroke of the needle roller assembly 400 and the piston 520 is in an accelerated state, thereby increasing the locking force.

[0047] Specifically, the stroke adjusting member may be an adjusting screw, in which case the stroke adjusting member and the first rotating sleeve 100 are threadedly matched. The stroke adjusting member may also be an adjusting buckle, in which case the stroke adjusting member and the first rotating sleeve 100 are snap-fitted.

[0048] In one embodiment, the functional shaft further includes an elastic force adjustment member (not shown), which is disposed at one end of the return spring 300 away from the damping structure 500 , and one end of the elastic force adjustment member is connected to the first rotating sleeve 100 , and the other end is connected to the end of the return spring 300 away from the damping structure 500 to adjust the compression amount of the return spring 300 .

[0049] With such a configuration, the elastic force of the return spring 300 can be changed by the elastic force adjusting member, thereby achieving adjustment of the moving speed of the needle roller assembly 400.

[0050] Specifically, the elastic adjustment member can be an adjustment screw, in which case the elastic adjustment member and the first rotating sleeve 100 are threadedly matched. The elastic adjustment member can also be an adjustment buckle, in which case the elastic adjustment member and the first rotating sleeve 100 are snap-fitted.

[0051] In one embodiment, if Figure 3 As shown, the needle roller assembly 400 includes a main body 410 and a needle body 420. The main body 410 is arranged in the first rotating sleeve 100 and is coaxially arranged with the first rotating sleeve 100. The needle body 420 is fixedly inserted into the main body 410 along the radial direction of the first rotating sleeve 100 and extends out of both ends of the main body 410. One end of the needle body 420 is movably inserted into the first spiral groove 121 and the first linear groove 210, and the other end is movably inserted into the second spiral groove 122 and the second linear groove.

[0052] In this way, the movement stability of the needle roller assembly 400 is greatly improved.

[0053] See also Figure 1-Figure 3 The present application also provides a hinge device, which includes a first rotating blade 600 and a second rotating blade 700. The first rotating blade 600 is fixedly sleeved on the outer peripheral side of the first rotating sleeve 100, and the second rotating blade 700 is fixedly sleeved on the outer peripheral side of the second rotating sleeve 200.

[0054] Specifically, the first rotating blade 600 is welded or clamped to the outer circumference of the first rotating sleeve 100 , and the second rotating blade 700 is welded or clamped to the outer circumference of the second rotating sleeve 200 .

[0055] In one embodiment, if Figure 1-Figure 3 As shown, the hinge device further includes a first decorative cover 800 and a second decorative cover 900 . The first decorative cover 800 is disposed on one end of the first rotating blade 600 , and the second decorative cover 900 is disposed on the other end of the first rotating blade 600 .

[0056] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

[0058] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0060] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0061] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A functional shaft, characterized in that: The invention comprises a first rotating sleeve (100), a second rotating sleeve (200), a return spring (300), a needle roller assembly (400) and a damping structure (500), wherein the side wall of the first rotating sleeve (100) is provided with a first spiral groove (121) and a second spiral groove (122) respectively extending spirally around its own axial direction, and the side wall of the second rotating sleeve (200) is provided with a first linear groove (210) and a second linear groove respectively extending along its own axial direction, and the second rotating sleeve (200) is rotatably sleeved on the outer peripheral side of the first rotating sleeve (100) and is coaxially arranged with the first rotating sleeve (100); The needle roller assembly (400) is movably connected to the first rotating sleeve (100), and one end of the needle roller assembly (400) is movably arranged to pass through the first spiral groove (121) and the first linear groove (210), and the other end is movably arranged to pass through the second spiral groove (122) and the second linear groove; The axial direction of the first rotating sleeve (100) and the axial direction of the second rotating sleeve (200) are defined as preset axial directions, and the damping structure (500) is provided at one end of the needle roller assembly (400) to apply a damping force along the preset axial direction to the needle roller assembly (400); The return spring (300) is arranged at one end of the needle roller assembly (400) away from the damping structure (500); when the return spring (300) pushes the needle roller assembly (400) to move along a preset axial direction toward the damping structure (500), the needle roller assembly (400) can drive the second rotating sleeve (200) to rotate around the preset axial direction; The damping structure (500) comprises a valve needle (510), a piston (520) and a cylinder (530); the cylinder (530) is provided with a cavity, and oil is provided in the cavity; the piston (520) is movably arranged in the cavity to separate the cavity into a first cavity (531) and a second cavity (532); and a flow gap is provided between the outer peripheral side of the piston (520) and the inner wall of the cylinder (530); one end of the valve needle (510) is fixedly connected to the piston (520), and the other end can movably pass through the first cavity (531) and extend out of the cylinder (530); When the needle roller assembly (400) pushes the valve needle (510) and the piston (520) to move toward an end away from the return spring (300), the oil in the second chamber (532) can enter the first chamber (531) through the flow gap; The inner diameter of the end of the cavity away from the return spring (300) is larger than the inner diameter of the end of the cavity close to the return spring (300); The cavity comprises a large-diameter cavity and a small-diameter cavity, the diameter of the large-diameter cavity is larger than the diameter of the small-diameter cavity, and the large-diameter cavity is arranged at an end of the cavity away from the return spring (300), and the small-diameter cavity is arranged at an end of the cavity close to the return spring (300); or, the inner diameter of the cavity tends to gradually increase along the direction from the return spring (300) to the damping structure (500).

2. The functional shaft according to claim 1, characterized in that The damping structure (500) further includes a damping spring (540), which is disposed in the second chamber (532). The damping spring (540) is capable of applying an elastic force to the piston (520) toward the return spring (300).

3. The functional shaft according to claim 1, characterized in that The invention also includes a stroke adjusting member, which is arranged at one end of the damping structure (500) away from the return spring (300), one end of the stroke adjusting member is connected to the first rotating sleeve (100), and the other end is connected to one end of the cylinder (530) away from the return spring (300), and the stroke adjusting member can push the damping structure (500) to move along a preset axial direction in the first rotating sleeve (100).

4. The functional shaft according to claim 1, characterized in that: It also includes an elastic force adjustment member, which is arranged at one end of the return spring (300) away from the damping structure (500), one end of the elastic force adjustment member is connected to the first rotating sleeve (100), and the other end is connected to the end of the return spring (300) away from the damping structure (500), so as to adjust the compression amount of the return spring (300).

5. The functional shaft according to claim 1, characterized in that: The needle roller assembly (400) comprises a main body (410) and a needle body (420), wherein the main body (410) is arranged in the first rotating sleeve (100) and is coaxially arranged with the first rotating sleeve (100), and the needle body (420) is fixedly inserted into the main body (410) along the radial direction of the first rotating sleeve (100) and extends out of both ends of the main body (410), and one end of the needle body (420) is movably inserted into the first spiral groove (121) and the first linear groove (210), and the other end is movably inserted into the second spiral groove (122) and the second linear groove.

6. A hinge device, characterized in that: The utility model comprises a first rotating blade (600), a second rotating blade (700) and a functional shaft according to any one of claims 1 to 5, wherein the first rotating blade (600) is fixedly sleeved on the outer peripheral side of the first rotating sleeve (100), and the second rotating blade (700) is fixedly sleeved on the outer peripheral side of the second rotating sleeve (200).

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