Double-thread asynchronous combined type anti-loose fastener

By using double-threaded asynchronous combined anti-loosening fasteners on large nuts, using reverse external threads and compression springs and ball structures in arcuate grooves, the problem of loosening of large nuts is solved and better locking and anti-loosening are achieved effect and simplifies operation.

CN222376950UActive Publication Date: 2025-01-21TIANJIN AEROSPACE ELECTROMECHANICAL EQUIP RES INST
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Patent Information

Application Number
CN202420572712.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-22
Publication Date
2025-01-21
Estimated Expiration
2034-03-22

AI Technical Summary

Technical Problem

Large nuts are prone to loosening under the influence of the external environment, resulting in failure of the connection. The existing anti-loosening measures are not effective on nuts above 30mm and are troublesome to operate.

Method used

It adopts double-threaded asynchronous combined anti-loosening fasteners, including bolts, lower nuts and upper nuts, and achieves better locking and anti-loosening effects through reverse external threads and compression springs and ball structures in arcuate grooves.

Benefits of technology

This design achieves effective anti-loosening of large nuts, avoids connection failure, facilitates installation and disassembly, and saves costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a double-thread asynchronous combined type anti-loose fastener which comprises a bolt, a nut and a nut, the lower nut is in threaded connection with a screw rod of the bolt, a connecting part is arranged at the upper end of the lower nut, and external threads are formed in the outer side of the connecting part; and the upper nut is in threaded connection with the screw rod, a third internal threaded hole matched with the external threads of the connecting part is formed in the inner side of the lower end of the upper nut, and the third internal threaded hole in the lower end of the upper nut is in threaded connection with the connecting part. The nut has the advantages that compared with a traditional elastic washer, the nut can be repeatedly used, cost is saved, and the nut is convenient to mount and dismount.
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Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, in particular to a double-thread asynchronous combined anti-loosening fastener. Background Art

[0002] Bolts and nuts used for threaded connections are widely used in the connection of parts because of their simple structure and easy use. Bolts and nuts with ordinary threads are the most widely used. After the bolts and nuts are locked together, the nuts are most likely to loosen under the influence of factors such as the external environment, resulting in connection failure. In order to prevent the nuts from loosening, people have taken many measures, such as using spring washers to prevent loosening, changing the pitch to prevent loosening, and using rubber combination caps to prevent loosening. However, for large nuts over 30 mm, after adopting the above measures, the locking and anti-loosening effect is still not good, and a large wrench or power handle is required to tighten them under the premise of a certain torque, which is cumbersome to operate and inconvenient to disassemble. Utility Model Content

[0003] In view of this, the utility model aims to provide a double-thread asynchronous combined anti-loosening fastener, in order to solve at least one of the above-mentioned technical problems.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A double-thread asynchronous combined anti-loosening fastener, comprising:

[0006] bolt;

[0007] A lower nut, wherein the lower nut is threadedly connected to the screw rod of the bolt, a connecting portion is provided at the upper end of the lower nut, and an external thread is formed on the outer side of the connecting portion;

[0008] An upper nut, wherein the upper nut is threadedly connected to the screw rod, a third internal threaded hole matching the external thread of the connecting part is opened on the inner side of the lower end of the upper nut, and the third internal threaded hole at the lower end of the upper nut is threadedly connected to the connecting part.

[0009] Furthermore, one end of the connecting portion adjacent to the upper nut is provided with a circle of reverse external threads.

[0010] Furthermore, one end of the screw rod away from the bolt head is provided with a circle of reverse external threads.

[0011] Furthermore, a second internal threaded hole is formed on the inner side of the upper nut, an arc-shaped groove is formed on the inner side wall of the second internal threaded hole, and the arc-shaped groove is arranged along the circumference of the second internal threaded hole;

[0012] A compression spring and a ball are arranged in the arc groove, one end of the compression spring contacts the side wall of one end of the arc groove, and the other end of the compression spring presses the ball against the other end of the arc groove;

[0013] The ball is located at the front end of the arc groove along the tightening direction of the upper nut.

[0014] Furthermore, an arc-shaped support sheet is provided in the compression spring, and the curvature of the arc-shaped support sheet is greater than the curvature of the arc-shaped groove;

[0015] The inner side wall of the arc-shaped groove adjacent to one end of the ball adopts a chamfered structure.

[0016] Furthermore, the upper nut includes a first split nut and a second split nut, and the first split nut and the second split nut are detachably connected.

[0017] Furthermore, a connecting hook is fixedly provided at the lower end of the first split nut, and a connecting groove matching the connecting hook is formed at the lower end of the second split nut, and the connecting hook is located on the inner side of the connecting groove.

[0018] Further, a first positioning groove is formed on the lower end surface of the first split nut, a second positioning groove is formed on the lower end surface of the second split nut, a connecting rod is provided corresponding to the first positioning groove, one end of the connecting rod is installed on the inner side of the first positioning groove, and the other end of the connecting rod is installed on the inner side of the second positioning groove;

[0019] The two ends of the connecting rod are respectively provided with connecting holes, the first positioning groove and the second positioning groove are provided with fourth internal threaded holes corresponding to the connecting holes, and connecting screws are arranged in the connecting holes, and the connecting screws pass through the connecting threads and are connected to the inner side of the fourth internal threaded hole.

[0020] Furthermore, the fitting surfaces of the first split nut and the second split nut coincide with the axis of the second internal threaded hole.

[0021] Furthermore, the lower nut is a hexagonal prism-shaped structural member, and a first internal threaded hole is formed inside the lower nut;

[0022] The upper nut is a hexagonal column-shaped structural member, and a second internal threaded hole is formed inside the upper nut.

[0023] Compared with the prior art, the double-thread asynchronous combined anti-loosening fastener described in the utility model has the following beneficial effects:

[0024] Compared with the traditional elastic washers, the double-thread asynchronous combined anti-loosening fastener of the utility model has a nut that can be reused, saves costs, and is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the fastener according to the embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the upper nut according to an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the three-dimensional structure of the first split nut according to an embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the second split nut according to an embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the front cross-sectional structure of the fastener according to the embodiment of the utility model;

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the fastener at the arc groove according to an embodiment of the utility model;

[0032] Figure 7 For the embodiment of the utility model Figure 6 Schematic diagram of the structure at point A in the middle.

[0033] Description of reference numerals:

[0034] 1. Upper nut; 2. Bolt; 3. Lower nut; 4. Compression spring; 5. Ball; 6. Arc-shaped support plate; 101. First split nut; 102. Second split nut; 103. Connecting hook; 104. Arc-shaped groove; 105. Connecting groove; 10401. Chamfered structure; 201. Head; 202. Screw; 301. Connecting part. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] like Figures 1 to 7 As shown, a double-thread asynchronous combined anti-loosening fastener comprises:

[0040] Bolt 2;

[0041] A lower nut 3, the lower nut 3 is threadedly connected to the screw rod 202 of the bolt 2, a connecting portion 301 is provided at the upper end of the lower nut 3, and an external thread is formed on the outer side of the connecting portion 301;

[0042] The upper nut 1 is threadedly connected to the screw rod 202 , and a third internal threaded hole matching the external thread of the connecting part 301 is opened on the inner side of the lower end of the upper nut 1 . The third internal threaded hole at the lower end of the upper nut 1 is threadedly connected to the connecting part 301 .

[0043] One end of the connection part 301 adjacent to the upper nut 1 is provided with a circle of reverse external threads, and the reverse external threads of the connection part 301 play a role in preventing loosening.

[0044] One end of the screw rod 202 away from the head 201 of the bolt 2 is provided with a circle of reverse external threads, and the reverse external threads of the screw rod 202 play a role in preventing loosening.

[0045] A second internal threaded hole is formed inside the upper nut 1, and an arc groove 104 is formed on the inner wall of the second internal threaded hole. The arc groove 104 is arranged along the circumference of the second internal threaded hole.

[0046] A compression spring 4 and a ball 5 are arranged in the arc groove 104. One end of the compression spring 4 contacts the side wall of one end of the arc groove 104, and the other end of the compression spring 4 presses the ball 5 against the other end of the arc groove 104. The ball 5 is located at the front end of the arc groove 104 along the tightening direction of the upper nut 1. When the upper nut 1 is tightened, the ball 5 moves toward the compression spring 4, and the compression spring 4 is compressed, so that the upper nut 1 can be tightened. When the nut is loose, the relative movement between the upper nut 1 and the screw 202 drives the ball 5 to move away from the spring, thereby clamping the screw 202.

[0047] The compression spring 4 is provided with an arc-shaped support sheet 6, and the arc of the arc-shaped support sheet 6 is greater than the arc of the arc-shaped groove 104; the inner side wall of the arc-shaped groove 104 near the end of the ball 5 adopts a chamfered structure 10401. When the upper nut 1 is tightened, the compression spring 4 and the ball 5 are subjected to force, so that the upper nut 1 and the bolt 2 are tightened and in closer contact. The arc-shaped support sheet 6 has a larger arc-shaped support sheet than the arc-shaped support sheet 104. When the workpiece vibrates or is affected by the external environment, the upper nut 1 is tightened and locked. The arc-shaped support sheet 6 in the upper nut 1 squeezes the compression spring 4 and the ball 5, so that the compression spring 4 and the ball 5 squeeze the bolt 2, generating lifting tension, and the check ball 5 plays a role in preventing the nut from loosening, thereby achieving a perfect locking and anti-loosening effect. In addition, the arc-shaped support sheet 6 has a larger arc-shaped support sheet than the arc-shaped support sheet 104, which can also prevent the compression spring 4 and the ball 5 from falling off when the upper nut 1 is loosened.

[0048] The upper nut 1 comprises a first split nut 101 and a second split nut 102 , and the first split nut 101 and the second split nut 102 are detachably connected.

[0049] In some embodiments, a connecting hook 103 is fixedly disposed at the lower end of the first split nut 101 , a connecting groove 105 matching the connecting hook 103 is formed at the lower end of the second split nut 102 , and the connecting hook 103 is located on the inner side of the connecting groove 105 .

[0050] In other embodiments, a first positioning groove is opened on the lower end surface of the first split nut 101, and a second positioning groove is opened on the lower end surface of the second split nut 102. A connecting rod is provided corresponding to the first positioning groove, one end of the connecting rod is installed on the inner side of the first positioning groove, and the other end of the connecting rod is installed on the inner side of the second positioning groove; connecting holes are respectively opened at both ends of the connecting rod, and the first positioning groove and the second positioning groove are opened with fourth internal threaded holes corresponding to the connecting holes. A connecting screw is provided in the connecting hole, and the connecting screw passes through the connecting thread and is connected to the inner side of the fourth internal threaded hole.

[0051] The mating surfaces of the first split nut 101 and the second split nut 102 coincide with the axis of the second internal threaded hole.

[0052] The lower nut 3 is a hexagonal prism-shaped structural member, and a first internal threaded hole is formed inside the lower nut 3;

[0053] The upper nut 1 is a hexagonal prism-shaped structural member, and a second internal threaded hole is formed inside the upper nut 1 .

[0054] Working process:

[0055] The bolt 2 passes through the part to be fastened, and the lower nut 3 is tightened to press the part to be fastened against the outer side of the bolt 2, and then the upper nut 1 is tightened to be threadedly connected with the connecting parts of the bolt 2 and the lower nut 3. When the upper nut 1 is tightened, the compression spring 4 and the ball 5 are subjected to force, so that the upper nut 1 and the bolt 2 are tightened and in closer contact. The arcuate degree of the arc support piece 6 is greater than the arcuate degree of the arc groove 104. When the deformation of the arc support piece 6 reaches the maximum, it supports the ball 5 to prevent the ball 5 from continuing to move. When the workpiece vibrates or is affected by the external environment, the upper nut 1 is tightened and locked. The arc support piece 6 in the upper nut 1 squeezes the compression spring 4 and the ball 5, so that the compression spring 4 and the ball 5 squeeze the bolt 2 to generate lifting tension, and the check ball 5 prevents the nut from loosening, thereby achieving a perfect locking and anti-loosening effect.

[0056] Compared with traditional elastic washers, the lower nut 3 and the lower nut 3 are designed to be reusable, save costs, and are easy to install and disassemble.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-thread asynchronous combined anti-loosening fastener, characterized in that: include: Bolt (2); A lower nut (3), the lower nut (3) being threadedly connected to the screw rod (202) of the bolt (2), the upper end of the lower nut (3) being provided with a connecting portion (301), and the outer side of the connecting portion (301) being provided with an external thread; An upper nut (1), the upper nut (1) being threadedly connected to the screw rod (202), a third internal threaded hole matching the external thread of the connecting portion (301) being formed on the inner side of the lower end of the upper nut (1), and the third internal threaded hole at the lower end of the upper nut (1) being threadedly connected to the connecting portion (301).

2. A double-thread asynchronous combined anti-loosening fastener according to claim 1, characterized in that: The connecting portion (301) is provided with a circle of reverse external threads at one end adjacent to the upper nut (1).

3. A double-thread asynchronous combined anti-loosening fastener according to claim 1, characterized in that: The end of the screw rod (202) away from the head (201) of the bolt (2) is provided with a circle of reverse external threads.

4. A double-thread asynchronous combined anti-loosening fastener according to claim 1, characterized in that: A second internal threaded hole is formed on the inner side of the upper nut (1), an arc-shaped groove (104) is formed on the inner side wall of the second internal threaded hole, and the arc-shaped groove (104) is arranged along the circumference of the second internal threaded hole; A compression spring (4) and a ball (5) are arranged in the arc-shaped groove (104); one end of the compression spring (4) contacts the side wall of one end of the arc-shaped groove (104); and the other end of the compression spring (4) presses the ball (5) against the other end of the arc-shaped groove (104); The ball (5) is located at the front end of the arc groove (104) along the tightening direction of the upper nut (1).

5. A double-thread asynchronous combined anti-loosening fastener according to claim 4, characterized in that: An arc-shaped support sheet (6) is provided inside the compression spring (4), and the arc of the arc-shaped support sheet (6) is greater than the arc of the arc-shaped groove (104); The inner side wall of the arc-shaped groove (104) adjacent to one end of the ball (5) adopts a chamfered structure (10401).

6. A double-thread asynchronous combined anti-loosening fastener according to claim 4, characterized in that: The upper nut (1) comprises a first split nut (101) and a second split nut (102), and the first split nut (101) and the second split nut (102) are detachably connected.

7. A double-thread asynchronous combined anti-loosening fastener according to claim 6, characterized in that: A connecting hook (103) is fixedly provided at the lower end of the first split nut (101), and a connecting groove (105) matching the connecting hook (103) is formed at the lower end of the second split nut (102), wherein the connecting hook (103) is located on the inner side of the connecting groove (105).

8. The double-thread asynchronous combined anti-loosening fastener according to claim 6, characterized in that: A first positioning groove is formed on the lower end surface of the first split nut (101), and a second positioning groove is formed on the lower end surface of the second split nut (102). A connecting rod is provided corresponding to the first positioning groove, one end of the connecting rod is installed on the inner side of the first positioning groove, and the other end of the connecting rod is installed on the inner side of the second positioning groove. The two ends of the connecting rod are respectively provided with connecting holes, the first positioning groove and the second positioning groove are provided with fourth internal threaded holes corresponding to the connecting holes, and connecting screws are arranged in the connecting holes, and the connecting screws pass through the connecting threads and are connected to the inner side of the fourth internal threaded hole.

9. The double-thread asynchronous combined anti-loosening fastener according to claim 5, characterized in that: The mating surfaces of the first split nut (101) and the second split nut (102) coincide with the axis of the second internal threaded hole.

10. The double-thread asynchronous combined anti-loosening fastener according to claim 1, characterized in that: The lower nut (3) is a hexagonal prism-shaped structural member, and a first internal threaded hole is formed on the inner side of the lower nut (3); The upper nut (1) is a hexagonal prism-shaped structural member, and a second internal threaded hole is formed on the inner side of the upper nut (1).