Detachable anti-loose threaded connection structure

Abstract

The utility model provides a detachable anti-loose threaded connection structure, and belongs to the technical field of assembly structures. Comprising a connected piece, a screw plug, a screw and a stop cylinder, a threaded connecting hole is formed in the connected piece and comprises a first threaded section, a connecting through hole and a second threaded section, and the hole diameter of the connecting through hole is smaller than that of the first threaded section and that of the second threaded section. The screw plug is arranged in the first threaded section, and a first locking structure is arranged in an inner hole of the screw plug; the screw comprises a locking section and a threaded connection section, the threaded connection section is in threaded connection with the second threaded section, the locking section penetrates into the first threaded section, and the locking section is provided with a second locking structure. The stop cylinder is detachably installed between the locking section and an inner hole of the screw plug and fixedly connected with the screw plug and the locking section through a first locking structure and a second locking structure. The technical problems that in the prior art, a threaded connection anti-loosening structure is complex in assembly and poor in anti-loosening reliability and durability due to structural defects can be solved.

Description

Technical Field

[0001] This utility model relates to the field of assembly structure technology, and in particular to a detachable anti-loosening threaded connection structure. Background Technology

[0002] Threaded connections, as a common mechanical fastening method, are widely used in machinery manufacturing, automotive industry, aerospace, and construction engineering. They achieve fastening of connected parts through the mating of threaded pairs, offering advantages such as simple structure, convenient assembly and disassembly, and high load-bearing capacity. However, under dynamic conditions such as long-term vibration, impact loads, or temperature changes, threaded connections are prone to loosening due to slight slippage between the threaded pairs, leading to a decrease in preload and severely affecting the stability and safety of the connection structure.

[0003] In related technologies, existing anti-loosening structures mostly focus on optimizing the fit between the nut and the screw. However, in practical applications, due to the asymmetry of vibration energy transmission, the nut side is more prone to circumferential loosening than the screw head side. Traditional anti-loosening methods often apply constraints to the end face of the nut or local threads, such as adding elastic elements like spring washers or wave washers to one side of the nut, adding extra nylon inserts to lock the nut, or using thread-locking adhesive for chemical anti-loosening.

[0004] Existing anti-loosening methods are insufficient to effectively prevent the gradual loosening of nuts caused by alternating shear forces. Furthermore, long-term use can lead to a decline in anti-loosening performance due to material creep or wear. Additionally, some irregularly shaped anti-loosening structures are prone to plastic deformation after repeated disassembly and assembly, resulting in overall failure. Therefore, there is an urgent need for an anti-loosening structure designed specifically for the loosening characteristics of threaded connections, which can simplify the assembly process while improving reliability and durability. Utility Model Content

[0005] This utility model provides a detachable anti-loosening threaded connection structure, which solves the technical problems of complex assembly, poor anti-loosening reliability, and low durability caused by structural defects in related threaded connection anti-loosening structures. The technical solution is as follows:

[0006] This utility model embodiment provides a detachable anti-loosening threaded connection structure, including a connected part, a screw plug, a screw, and a stop sleeve.

[0007] The connected component is provided with a threaded connection hole, which includes a first threaded segment, a connecting through hole and a second threaded segment connected coaxially in sequence. The first threaded segment and the second threaded segment have the same thread direction, and the diameter of the connecting through hole is smaller than the diameter of the first threaded segment and the second threaded segment.

[0008] The screw plug is threadedly connected to the first threaded section, and the inner hole of the screw plug is provided with a first locking structure that matches the outer wall of the stop cylinder.

[0009] The screw includes a locking section and a threaded connection section connected coaxially in sequence. The threaded connection section is threadedly connected to the second threaded section. The locking section passes through the connecting through hole into the first threaded section. The locking section is provided with a second locking structure that matches the inner sidewall of the stop cylinder.

[0010] The stop cylinder is detachably installed between the locking section and the inner hole of the screw plug, and is fixedly connected to the screw plug and the locking section through the first locking structure and the second locking structure.

[0011] Optionally, the first locking structure consists of a plurality of first limiting sidewalls arranged circumferentially around the inner hole of the screw plug, wherein the plurality of first limiting sidewalls are arranged at equal angles and connected to each other.

[0012] Optionally, the second locking structure consists of a plurality of second limiting sidewalls arranged circumferentially around the axis of the locking segment, wherein the plurality of second limiting sidewalls are arranged at equal angles and connected to each other.

[0013] Optionally, the number of the first limiting sidewalls is different from the number of the second limiting sidewalls.

[0014] Optionally, the number of the first limiting sidewalls is greater than the number of the second limiting sidewalls.

[0015] Optionally, a limiting segment is provided at the end of the threaded connection segment away from the locking segment, and the diameter of the limiting segment is larger than the bore diameter of the second threaded segment.

[0016] Optionally, the axial length of the stop cylinder is greater than the axial length of the first threaded section.

[0017] Optionally, a relief groove is machined at the connection points between the connecting through hole and the first threaded segment and the second threaded segment.

[0018] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0019] The detachable anti-loosening threaded connection structure provided in this embodiment of the invention involves a modified shape treatment of the connected parts and screw mating structure requiring anti-loosening connection. A first threaded segment and a second threaded segment with the same thread direction on both sides are machined on the connected parts. A relatively small-diameter connecting through hole is located in the middle, and a radially inwardly protruding boss structure is formed inside the threaded connection hole. When the screw is screwed in, the threaded connection segment mates with the second threaded segment, while the locking segment passes through the connecting through hole and enters the first threaded segment. A screw plug is screwed into the first threaded segment, and a stop sleeve is further installed between the screw plug's inner hole (after adjusting its relative position) and the locking segment to achieve a tight fit. When the screw shows a tendency to loosen and unscrew, the boss end face inside the threaded connection hole can restrict the rotation of the stop sleeve and screw plug, thereby curbing the overall loosening and unscrewing tendency of the screw. The overall structure is simple and easy to install and assemble. All anti-loosening related mating structures are located inside the connected parts, occupying little space. Moreover, the anti-loosening function will only fail when the locking section of the screw, the screw plug, and the stop cylinder structure are irreversibly damaged. It has high reliability and can be adaptively maintained and replaced according to actual conditions. It effectively solves the technical problems of complex assembly, poor anti-loosening reliability and durability caused by structural defects in threaded connection anti-loosening structures in related technologies. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the assembly structure of the detachable anti-loosening threaded connection structure provided in this embodiment of the utility model;

[0022] Figure 2 yes Figure 1 Top view of the mating structure of the middle screw plug, stop cylinder and retraction section;

[0023] Figure 3 This is a structural cross-sectional view of the connected component provided in this embodiment of the utility model;

[0024] Figure 4 This is a cross-sectional view of the screw plug provided in an embodiment of the present invention;

[0025] Figure 5 This is a top view of the screw plug provided in this embodiment of the utility model;

[0026] Figure 6 This is a structural cross-sectional view of the screw provided in an embodiment of this utility model;

[0027] Figure 7 This is a top view of the locking section provided in an embodiment of the present invention;

[0028] Figure 8 This is a structural cross-sectional view of the stop cylinder provided in this embodiment of the utility model;

[0029] Figure 9 This is a top view of the structure of the stop cylinder provided in this embodiment of the utility model.

[0030] In the diagram: 1-Connected part; 2-Plug; 3-Screw; 4-Stop cylinder; 11-Threaded connection hole; 21-First locking structure; 31-Locking section; 32-Threaded connection section; 33-Limiting section; 111-First threaded section; 112-Connecting through hole; 113-Second threaded section; 114-Relief groove; 211-First limiting sidewall; 311-Second locking structure; 3111-Second limiting sidewall. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the assembly structure of the detachable anti-loosening threaded connection structure provided in this embodiment of the utility model; Figure 2 yes Figure 1 Top view of the mating structure of the middle screw plug, stop cylinder, and retraction section Figure 3 This is a structural cross-sectional view of the connected component provided in this embodiment of the utility model; Figure 4 This is a cross-sectional view of the screw plug provided in an embodiment of the present invention; Figure 5 This is a top view of the screw plug provided in this embodiment of the utility model; Figure 6 This is a structural cross-sectional view of the screw provided in an embodiment of this utility model; Figure 7 This is a top view of the locking section provided in an embodiment of the present invention; Figure 8 This is a structural cross-sectional view of the stop cylinder provided in this embodiment of the utility model; Figure 9 This is a top view of the structure of the stop cylinder provided in an embodiment of this utility model. Figures 1 to 9 As shown, this utility model embodiment provides a detachable anti-loosening threaded connection structure, including a connected part 1, a screw plug 2, a screw 3, and a stop cylinder 4.

[0033] The connected component 1 is provided with a threaded connection hole 11, which includes a first threaded section 111, a connecting through hole 112, and a second threaded section 113 connected coaxially in sequence. The first threaded section 111 and the second threaded section 113 have the same thread direction, and the diameter of the connecting through hole 112 is smaller than the diameter of the first threaded section 111 and the second threaded section 113.

[0034] The screw plug 2 is installed in the first threaded section 111 via a threaded connection, and the inner hole of the screw plug 2 is provided with a first locking structure 21 that matches the outer wall of the stop cylinder 4.

[0035] The screw 3 includes a locking section 31 and a threaded connection section 32 connected coaxially in sequence. The threaded connection section 32 is threadedly connected to the second threaded section 113. The locking section 31 passes through the connecting through hole 112 into the first threaded section 111. The locking section 31 is provided with a second locking structure 311 that matches the inner sidewall of the stop cylinder 4.

[0036] The stop cylinder 4 is detachably installed between the locking section 31 and the inner hole of the screw plug 2, and is fixedly connected to the screw plug 2 and the locking section 31 through the first locking structure 21 and the second locking structure 311.

[0037] In this embodiment of the utility model, when using the detachable anti-loosening threaded connection structure, the screw 3 is aligned with the threaded connection hole 11 on the connected part 1 and screwed in from one side of the second threaded section 113. After tightening, the threaded connection section 32 is threadedly connected to the second threaded section 113, and the locking section 31 at the end of the threaded connection section 32 extends into the first threaded section 111 through the connecting through hole 112. Then, the screw plug 2 is screwed into the threaded connection hole 11 from the open side of the first threaded section 111. The tightness of the screw plug 2 is adjusted according to the shape of the inner and outer walls of the stop cylinder 4 so that the first locking structure 21 in the inner hole of the screw plug 2 and the second locking structure 311 on the locking section 31 are both adjusted to the preset relative positions. Then, the stop cylinder 4 is inserted into the threaded connection hole 11 from the open side of the first threaded section 111. The outer wall of the stop cylinder 4 fits tightly with the inner wall of the screw plug 2 and is relatively fixed by the first locking structure 21; the inner wall of the stop cylinder 4 fits tightly with the outer wall of the locking section 31 and is relatively fixed by the second locking structure 311. Once inserted, the stop cylinder 4 will be fixedly fitted between the locking section 31 and the inner hole of the screw plug 2 without external tools, filling the gap between them. Simultaneously, through locking, the locking section 31, the stop cylinder 4, and the screw plug 2 are integrally fitted and fastened to form a unified structure. When the screw 3 loosens and the threaded connection section 32 tends to unscrew relative to the second threaded section 113 of the threaded connection hole 11, the locking section 31 at its end will drive the stop cylinder 4 and the screw plug 2 to rotate in the same direction. Since the first threaded section 111 and the second threaded section 113 have the same thread direction, refer to... Figure 1When the threaded connecting section 32 tends to unscrew downwards from the threaded connecting hole 11, the stop cylinder 4 and the screw plug 2 will also rotate and sink in the first threaded section 111 in the same direction of rotation, driven by the locking section 31. Since the diameter of the connecting through hole 112 is smaller than that of the first threaded section 111 and the second threaded section 113, a boss structure that protrudes radially inwards along the threaded connecting hole 11 will be formed at the connection between the connecting through hole 112 and the first threaded section 111 and the second threaded section 113. After the end face of the stop cylinder 4 and the screw plug 2 near the threaded connecting hole 11 abuts against the boss end face of the threaded connecting hole 11 near the first threaded section 111, their downward tendency will be restricted and cannot continue. This will curb the overall loosening and unscrewing tendency of the threaded connecting section 32 and the screw 3, and achieve automatic anti-loosening.

[0038] The detachable anti-loosening threaded connection structure provided in this embodiment of the invention involves a modified shape for the connection structure of the connected component 1 and the screw 3, which require anti-loosening. A first threaded section 111 and a second threaded section 113 with the same thread direction on both sides are machined on the connected component 1. A relatively small-diameter connecting through hole 112 is formed in the middle, with a radially inwardly protruding boss structure inside. When the screw 3 is screwed in, the threaded connecting section 32 engages with the second threaded section 113, and the locking section 31 passes through the connecting through hole 112 and enters the first threaded section 111. A screw plug 2 is screwed into the first threaded section 111, and a stop cylinder 4 is further inserted between the adjusted inner hole of the screw plug 2 and the locking section 31 to achieve a tight fit. When the screw 3 shows a tendency to loosen and unscrew, the boss end face inside the threaded connecting hole 11 can restrict the rotation of the stop cylinder 4 and the screw plug 2, thereby curbing the overall loosening and unscrewing tendency of the screw 3. The overall structure is simple and easy to install and assemble. All anti-loosening related mating structures are located inside the connected part 1, occupying little space. Moreover, the anti-loosening function will only fail when the locking section 31 of the screw 3, the screw plug 2, and the stop cylinder 4 structure are irreversibly damaged. It has high reliability and can be adaptively maintained and replaced according to actual conditions. It effectively solves the technical problems of complex assembly, poor anti-loosening reliability and durability caused by structural defects in threaded connection anti-loosening structures in related technologies.

[0039] Optionally, the first locking structure 21 consists of multiple first limiting sidewalls 211 arranged circumferentially around the inner hole of the screw plug 2. These multiple first limiting sidewalls 211 are arranged at equal angles and interconnected. For example, in this embodiment of the invention, the outer side of the stop cylinder 4 has a regular polygonal prism structure. Correspondingly, by adaptively processing the inner hole of the screw plug 2 to form a regular polygonal inner hole, after the stop cylinder 4 is inserted, the multiple first limiting sidewalls 211 engage with the corresponding outer sidewall of the stop cylinder 4 to form a topological self-locking structure, thus achieving relative fixation and preventing relative rotation. Further, the second locking structure 311 consists of multiple second limiting sidewalls 3111 arranged circumferentially around the axis of the locking section 31. These multiple second limiting sidewalls 3111 are arranged at equal angles and interconnected. Similar to the mating structure between the outer side of the stop cylinder 4 and the inner hole of the screw plug 2, in this embodiment of the invention, the inner hole of the stop cylinder 4 is also processed into a regular polygon, and the sidewall of the locking section 31 is correspondingly processed into a polygonal prism structure. After the stop cylinder 4 is inserted and fitted onto the locking section 31, multiple second limiting sidewalls 3111 engage with the corresponding inner sidewalls of the stop cylinder 4 to form a topological self-locking structure, thereby achieving relative fixation. This causes the stop cylinder 4 to rotate relative to its inner and outer sides, making the locking section 31, the screw plug 2, and the stop cylinder 4 form an integrated mating structure. Using this processing configuration as the first locking structure 21 and the second locking structure 311 only requires standardized irregular shape processing when machining the inner holes of the locking section 31 and the screw plug 2. The structural shape processing is simple and the assembly is convenient.

[0040] Optionally, the number of first limiting sidewalls 211 differs from the number of second limiting sidewalls 3111. For example, in this embodiment of the invention, the number of first limiting sidewalls 211 is 12, meaning the inner hole of the screw plug 2 is a regular dodecagonal hole, while the number of second limiting sidewalls 3111 is 6, meaning the locking section 31 is a regular hexagonal prism. Correspondingly, the stop cylinder 4 is a regular dodecagonal prism, and its inner hole is a regular hexagonal hole. Since the inner and outer structures of the stop cylinder 4 are relatively fixed, and after the screw 3 is tightened, there may be deviations in the screwing depth and tightening degree, the relative position between the locking section 31 and the inner hole of the screw plug 2 after extending into the first threaded section 111 may also be deviated, causing interference with the stop cylinder 4 and making it difficult to insert directly. At this time, by differentiating the number of the first limiting sidewall 211 and the number of the second limiting sidewall 3111, more adjustment freedom can be brought about. After the locking section 31 is inserted, the relative position between the inner hole of the screw plug 2 and the outside of the locking section 31 can be adjusted by adaptively rotating the screw plug 2, so as to ensure that the stop cylinder 4 can be smoothly installed.

[0041] Optionally, the number of first limiting sidewalls 211 is greater than the number of second limiting sidewalls 3111. Furthermore, by setting the number of first limiting sidewalls 211 to be greater than the number of second limiting sidewalls 3111, the degree of adjustment freedom is further improved, allowing the screw plug 2 to be adjusted and engaged with the locking section 31 at a smaller rotation angle. Simultaneously, a larger contact area is achieved between the outer wall of the stop cylinder 4 and the inner hole of the screw plug 2, improving the tightness of the engagement.

[0042] Exemplarily, in this embodiment of the present invention, during the adjustment of the screw plug 2, its 12-sided inner hole relative to the hexagonal locking section 31 needs to ensure that the connecting vertices of the two side surfaces are aligned when they are in place, that is, it has a rotational fine-tuning range of 360° / 12 / 2=15°. More sides result in a smaller angle adjustment range, higher anti-loosening precision, and less force to withstand, and vice versa. In other possible implementations, the inner hole of the screw plug 2 and the outer side of the locking section 31 can be adapted to use polygonal structures with other numbers of sides, such as 10 sides, 12 sides, 16 sides, etc., and the present invention does not limit this.

[0043] Optionally, a limiting section 33 is provided at the end of the threaded connection section 32 away from the locking section 31, and the diameter of the limiting section 33 is larger than the bore diameter of the second threaded section 113. Exemplarily, in this embodiment of the present invention, by providing the limiting section 33, the screwing stroke of the screw 3 can be limited, ensuring that after tightening, the locking section 31 can extend into the first threaded section 111 in a preset posture, facilitating engagement with the inner hole of the plug 2.

[0044] Optionally, the axial length of the stop cylinder 4 is greater than the axial length of the first threaded section 111. Exemplarily, in this embodiment of the invention, the circumferential length of the stop cylinder 4 is greater than the axial length of the first threaded section 111, and slightly less than the sum of the axial lengths of the first threaded section 111 and the connecting through hole 112. While ensuring that the stop cylinder 4 does not protrude from the threaded connecting hole 11 through the opening of the first threaded section 111 after insertion, the contact area between the stop cylinder 4 and the locking section 31 and the inner hole of the screw plug 2 is maximized, further improving assembly stability.

[0045] Optionally, a relief groove 114 is machined at the connection between the connecting through hole 112 and the first threaded segment 111 and the second threaded segment 113. Exemplarily, in this embodiment of the invention, when machining the connecting through hole 112, a relatively larger inner diameter groove is pre-machined at the end of the surfaces to be machined on the first threaded segment 111 and the second threaded segment 113, that is, at the connection between the two and the end face of the connecting through hole 112 forming the internal boss structure, as a relief groove 114. This facilitates the removal of the machining path during thread cutting and improves machining efficiency.

[0046] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detachable anti-loosening threaded connection structure, characterized in that, include: The connected parts (1), the plug (2), the screw (3), and the stop cylinder (4) The connected component (1) is provided with a threaded connection hole (11). The threaded connection hole (11) includes a first threaded segment (111), a connecting through hole (112), and a second threaded segment (113) connected coaxially in sequence. The first threaded segment (111) and the second threaded segment (113) have the same thread direction. The diameter of the connecting through hole (112) is smaller than the diameters of the first threaded segment (111) and the second threaded segment (113). The screw plug (2) is installed in the first threaded section (111) by a threaded connection, and the inner hole of the screw plug (2) is provided with a first locking structure (21) that matches the outer wall of the stop cylinder (4). The screw (3) includes a locking section (31) and a threaded connection section (32) connected coaxially in sequence. The threaded connection section (32) is threadedly connected to the second threaded section (113). The locking section (31) passes through the connecting through hole (112) into the first threaded section (111). The locking section (31) is provided with a second locking structure (311) that matches the inner sidewall of the stop cylinder (4). The stop cylinder (4) is detachably installed between the locking section (31) and the inner hole of the screw plug (2), and is fixedly connected to the screw plug (2) and the locking section (31) through the first locking structure (21) and the second locking structure (311).

2. The detachable anti-loosening threaded connection structure according to claim 1, characterized in that, The first locking structure (21) consists of a plurality of first limiting sidewalls (211) arranged circumferentially around the inner hole of the screw plug (2), and the plurality of first limiting sidewalls (211) are arranged at equal angles and connected to each other.

3. The detachable anti-loosening threaded connection structure according to claim 2, characterized in that, The second locking structure (311) consists of a plurality of second limiting sidewalls (3111) arranged circumferentially around the axis of the locking segment (31), and the plurality of second limiting sidewalls (3111) are arranged at equal angles and connected to each other.

4. The detachable anti-loosening threaded connection structure according to claim 3, characterized in that, The number of the first limiting sidewall (211) is different from the number of the second limiting sidewall (3111).

5. The detachable anti-loosening threaded connection structure according to claim 4, characterized in that, The number of the first limiting sidewalls (211) is greater than the number of the second limiting sidewalls (3111).

6. The detachable anti-loosening threaded connection structure according to claim 1, characterized in that, The threaded connection section (32) is provided with a limiting section (33) at one end away from the locking section (31), and the diameter of the limiting section (33) is greater than the diameter of the second threaded section (113).

7. The detachable anti-loosening threaded connection structure according to any one of claims 1 to 6, characterized in that, The axial length of the stop cylinder (4) is greater than the axial length of the first threaded section (111).

8. The detachable anti-loosening threaded connection structure according to any one of claims 1 to 6, characterized in that, The connection points of the connecting through hole (112) with the first threaded section (111) and the second threaded section (113) are all machined with relief grooves (114).

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