Anti-loosening thread fastener, installation and disassembly method

Abstract

The present invention provides a threaded fastener for preventing loosening, and a method for installing and removing the threaded fastener, comprising: a threaded member, a side wall of which is provided with a limiting plane arranged along the length direction of the threaded member; and a collar, which is installed on the outside of the threaded member, and the inner diameter of the collar is larger than the minor diameter of the thread. The present invention has the beneficial effects of plastically locking the collar into the thread, preventing loosening by permanent deformation, and because of the limiting plane, the collar becomes a non-rotating body, and the deformation of the collar in each circumferential direction is different, and rotational loosening cannot occur, thereby improving the durability of the anti-loosening effect.

Description

Technical Field

[0001] The invention belongs to the technical field of threaded fasteners, and in particular relates to an anti-loosening threaded fastener, and an installation and disassembly method. Background Art

[0002] Bolts are one of the most common mechanical fasteners and are widely used in engineering machinery, building structures, automotive industry, aerospace and other fields. Ordinary bolts achieve fastening connections through the friction of the threads and the pre-tightening force. However, under the influence of external environments such as vibration, impact and temperature changes, bolt connections are prone to loosening, leading to structural failure. In order to solve this problem, a variety of anti-loosening bolt designs have appeared on the market to improve the reliability of the connection. The existing anti-loosening bolt technologies mainly include the following categories: First, friction anti-loosening: friction anti-loosening mainly achieves the anti-loosening effect by controlling the friction coefficient to ensure that there is a high resistance torque between the thread pairs, such as double nuts, nylon self-locking nuts, spring washers and wedge washers; Second, mechanical anti-loosening: mechanical anti-loosening is a traditional anti-loosening method, which mainly adds some components to the bolt connection structure to prevent the rotation of bolts or nuts, such as slotted nuts and cotter pins, eccentric nuts, stop washers, series steel wires, etc.; Third, permanent anti-loosening is divided into two types. The first is to destroy the threaded connection by external force so that the bolt connection structure cannot be disassembled, so that relative movement between the bolts and nuts is impossible, such as welding, riveting, etc.; The second is to apply anaerobic fastening glue on the thread. After curing, the fastening glue will form a strong bonding force between the thread pairs, which is difficult to disassemble; Changing tooth shape to prevent loosening: The principle of changing tooth shape to prevent loosening is to change the internal force mechanism of the threaded connection by changing the shape of the thread teeth, so that it has better anti-loosening performance.

[0003] Bolts are rotating structures, and relative slippage of threads is inevitable during vibration. Except for permanent deformation connection, various anti-loosening methods only delay the relative slippage speed of threads to varying degrees, rather than solving the loosening problem. Although permanent deformation connection can solve the problem of bolt anti-loosening, it introduces new problems, namely, the installation process is complicated, difficult to disassemble or even impossible to disassemble. These shortcomings are fatal to equipment maintenance, disassembly and other links. Therefore, such methods are often only applied in certain special scenarios and cannot be widely promoted. The existing anti-loosening bolts have the following problems: First, the anti-loosening effect is poor or not lasting. Under the action of vibration and external force, relative slippage of the bolt structure is inevitable. After a period of use, the anti-loosening effect of many anti-loosening solutions will weaken or even fail, and long-term stable connections cannot be ensured; second, sacrificing connection performance in exchange for anti-loosening performance. The double nut or anti-loosening washer design will increase the friction of the connection parts, but it will also bring additional stress concentration and friction loss, resulting in a decrease in connection performance. For Tang's thread, only 50% of the thread is used for load-bearing, resulting in a significant decrease in load-bearing performance, affecting the overall stability and long-term service life of the structure; third, the installation method is complex, Tool costs increase. Many existing anti-loosening bolt designs, especially permanent deformation connection designs, require additional installation steps and special tools, which not only increase the complexity of installation and tool costs, but also greatly reduce installation efficiency. Especially in large-scale or small space projects, complex installation steps may lead to significantly extended installation time, increased operating costs, and difficulty in meeting the needs of fast and efficient assembly; Fourth, disassembly is complicated or even impossible. For anti-loosening bolts with permanent deformation connections, such as ring groove rivets or chemical anti-loosening measures, although they can provide good anti-loosening effects, they often need to destroy the connecting parts during the disassembly process; for some equipment that requires regular maintenance or replacement of parts, this design that is complicated to disassemble or even impossible to disassemble greatly affects the convenience of maintenance and increases maintenance costs. Summary of the invention

[0004] In view of this, the present invention aims to provide an anti-loosening threaded fastener, and an installation and disassembly method, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A first aspect of the present invention provides an anti-loosening threaded fastener, comprising:

[0007] A threaded part, wherein a side wall of the threaded part is provided with a limiting plane arranged along the length direction of the threaded part;

[0008] The collar is installed on the outside of the threaded part, and the inner diameter of the collar is larger than the minor diameter of the thread.

[0009] Furthermore, it also includes:

[0010] A driving member is threadedly connected to the threaded member, a shaping ring is provided between the driving member and the collar, and the inner diameter of the shaping ring is smaller than the outer diameter of the collar.

[0011] Furthermore, the shaping ring is fixedly connected to the driving member.

[0012] Furthermore, a lubricating layer is provided on the inner side of the shaping ring;

[0013] The inner edge of the shaping ring adjacent to one end of the collar adopts a chamfered structure;

[0014] The outer edge of the sleeve ring adjacent to one end of the shaping ring adopts a chamfered structure.

[0015] Further, the inner diameter of the collar is smaller than the nominal diameter;

[0016] The inner side of the collar is provided with an internal thread matching the threaded member.

[0017] Furthermore, the driving member is a polygonal column structure, and a threaded hole matching the threaded member is formed on the driving member.

[0018] Furthermore, the number of the limiting planes is two, and the two limiting planes are symmetrically arranged along the axis of the threaded member;

[0019] An annular boss is fixedly arranged on the outer side of one end of the sleeve ring away from the shaping ring, and an anti-slip structure is arranged on the end surface of the annular boss away from the shaping ring.

[0020] Furthermore, the calculation formula of the width of the limiting plane is as follows:

[0021] ;

[0022] in, is the width of the limiting plane, is the nominal diameter, is the cutting coefficient, is the thread pitch.

[0023] A second aspect of the present invention provides a method for installing an anti-loosening threaded fastener, comprising the following steps:

[0024] S1. The threaded part passes through the connection hole of the fastener to be fastened, and the collar is installed on the outside of the threaded part;

[0025] S2, the driving member is threadedly connected with the threaded member;

[0026] S3, rotating the driving part in the tightening direction, driving the shaping ring to move downward, the shaping ring deforms the collar inward to lock the threaded part, and the gap between the inner side of the shaping ring and the limiting plane is reduced;

[0027] The anti-loosening thread fastener is the anti-loosening thread fastener described in the first aspect.

[0028] A third aspect of the present invention provides a method for disassembling a threaded fastener, comprising the following steps:

[0029] Cut the position corresponding to the limiting plane along the axial direction of the threaded member of the anti-loosening threaded fastener;

[0030] The anti-loosening threaded fastener is an anti-loosening threaded fastener installed by the anti-loosening threaded fastener installation method described in the second aspect.

[0031] Compared with the prior art, the anti-loosening thread fastener, installation and removal method described in the present invention have the following beneficial effects:

[0032] (1) The anti-loosening thread fastener described in the present invention plastically locks the collar into the thread and achieves anti-loosening through permanent deformation. Due to the effect of the limiting plane, the collar becomes a non-rotating body. The deformation amount of the collar in each circumferential direction is different, and rotational loosening cannot occur, thereby improving the durability of the anti-loosening effect.

[0033] (2) The anti-loosening threaded fastener described in the present invention cuts off part of the threads on both sides of the bolt, but the cutting ratio is low and the impact on the load-bearing performance is very small; and by replacing the nut with a combination of a collar and a driver, not only the anti-loosening effect is achieved, but also the damage to the overall performance of the bolt connection is reduced. Different from the traditional method of achieving anti-loosening by increasing friction or stress concentration, the ring-locking bolt structure achieves excellent anti-loosening performance while maintaining a high-strength connection, and there is no need to compromise between connection strength and anti-loosening performance.

[0034] (3) The installation steps of a threaded fastener for preventing loosening described in the present invention are exactly the same as those of ordinary bolts. It is only necessary to tighten the shaped nut with a torque wrench. Ordinary bolts require torque control during fine installation, so a torque wrench with a torque measurement function is required. The installation of the present invention is based on pressing the collar into the shaped nut, which is intuitive and clear. A torque wrench without any measurement function can be used to ensure installation consistency. Compared with the existing complex anti-loosening structure, the present invention provides an installation method that is simpler than ordinary bolts, is suitable for large-scale applications, and significantly reduces time and tool costs.

[0035] (4) The method for disassembling a threaded fastener according to the present invention can quickly and smoothly disassemble the ring lock bolt by using a disassembly tool while only destroying the collar, while retaining the integrity of the bolt and the drive member, thereby avoiding the problem of disassembly difficulty caused by permanent deformation of the connection. This design makes the equipment more convenient during maintenance and overhaul, ensures operational flexibility and reusability of components, improves overall maintenance efficiency, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 It is a schematic diagram of the cross-sectional structure of the anti-loosening thread fastener in the first embodiment of the present invention;

[0038] Figure 2 It is a cross-sectional structural schematic diagram of the installation process of the anti-loosening threaded fastener in the first embodiment of the present invention;

[0039] Figure 3 It is a schematic diagram of the three-dimensional structure of the anti-loosening thread fastener in the second embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the three-dimensional structure of the bolt in the second embodiment of the present invention;

[0041] Figure 5 It is a schematic diagram of the cross-sectional structure of the anti-loosening thread fastener in the second embodiment of the present invention;

[0042] Figure 6 For the embodiment of the present invention Figure 5 Schematic diagram of the structure at A in the middle;

[0043] Figure 7 It is a cross-sectional structural schematic diagram of the installation process of the anti-loosening threaded fastener in the second embodiment of the present invention;

[0044] Figure 8 It is a schematic cross-sectional structure diagram of the disassembly process of the anti-loosening threaded fastener according to an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1. Bolt; 101. Bolt head; 102. Screw; 103. Limiting plane; 2. Ring; 201. Annular boss; 202. Internal thread; 3. Driving member; 301. Shaping ring; 4. Part to be fastened; 5. Inner tube; 6. Outer tube; 601. Annular limiting boss; 602. Cutting knife; 7. Rotating sleeve; 8. Receiver sleeve. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0048] In the description of the present invention, 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 invention 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 limiting the present invention. In addition, the terms "first", "second", and the like 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. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0051] Embodiment 1

[0052] like Figure 1 , 2 As shown, a threaded fastener for preventing loosening, comprising:

[0053] A threaded member, wherein a limiting plane 103 is formed on a side wall of the threaded member and arranged along a length direction of the threaded member;

[0054] The collar 2 is installed on the outside of the threaded member, and the inner diameter of the collar 2 is larger than the thread diameter of the bolt.

[0055] The outer edge of the sleeve ring 2 adjacent to the shaping ring 301 is chamfered.

[0056] The inner diameter of the collar 2 is smaller than the nominal diameter of the bolt; an inner thread 202 matching the threaded member is formed on the inner side of the collar 2.

[0057] There are two limiting planes 103, and the two limiting planes 103 are symmetrically arranged along the axis of the threaded member;

[0058] An annular boss 201 is fixedly arranged on the outer side of one end of the collar 2 away from the shaping ring 301 , and an anti-slip structure is arranged on the end surface of the annular boss 201 away from the shaping ring 301 .

[0059] The calculation formula of the width of the limiting plane 103 is as follows:

[0060] ;

[0061] in, is the width of the limiting plane, is the nominal diameter of the bolt, is the cutting coefficient, is the thread pitch.

[0062] The threaded member may be a bolt 1 or a stud. The bolt 1 is taken as an example below. The bolt 1 includes a bolt head 101 and a screw rod 102 . A finite plane 103 is formed on the screw rod 102 .

[0063] The method for installing a threaded fastener includes the following steps:

[0064] S1. Bolt 1 passes through the connection hole of the fastener 4, and the collar 2 is installed on the outer side of the bolt 1 protruding from the fastener 4;

[0065] S2, the installation tool is threadedly connected to the threaded member, and a shaping ring 301 is provided at the lower end of the installation tool, and the inner diameter of the shaping ring 301 is smaller than the outer diameter of the collar 2;

[0066] S3. Rotate the installation tool in the tightening direction to drive the shaping ring 301 to move downward. The shaping ring 301 deforms the collar 2 inward to lock the threaded member, and the gap between the inner side of the shaping ring 301 and the limiting plane 103 is reduced.

[0067] The installation tool includes a rotating sleeve 7, which is threadedly connected to the bolt 1. A receiving sleeve 8 is fixed to the upper end of the shaping ring 301. The rotating sleeve 7 is installed on the inner side of the receiving sleeve 8, and the outer diameter of the rotating sleeve 7 matches the inner side of the receiving sleeve 8.

[0068] The method for disassembling a threaded fastener includes the following steps:

[0069] The position corresponding to the collar 2 and the limiting plane 103 is cut along the axial direction of the threaded part of the anti-loosening threaded fastener. The following is an example of using a disassembly tool to disassemble the anti-loosening threaded fastener.

[0070] like Figure 8As shown, the disassembly tool includes an outer tube 6, an annular limiting boss 601 is fixedly provided on the inner side of the lower end of the outer tube 6, two cutting knives 602 corresponding to the cutting plane are provided on the inner side of the annular limiting boss 601, and a gap exists between the cutting knife 602 and the limiting plane 103. An inner tube 5 is provided on the inner side of the outer tube 6, and the outer diameter of the inner tube 5 matches the outer diameter of the outer tube 6. An inner thread 202 matching the bolt 1 is provided on the inner side of the inner tube 5, and the inner tube 5 is threadedly connected with the bolt 1. The inner tube 5 is rotated in the tightening direction to drive the outer tube 6 and the cutting knife 602 to move downward, cutting the position of the collar 2 corresponding to the limiting plane 103, dividing the collar 2 into two arc plates, and recycling the bolt 1.

[0071] Embodiment 2:

[0072] like Figure 3-7 As shown, a threaded fastener for preventing loosening, comprising:

[0073] The threaded part has a side wall with a limiting plane 103 arranged along the length direction of the threaded part.

[0074] The collar 2 is installed on the outside of the threaded member, and the inner diameter of the collar 2 is greater than d3.

[0075] A driving member 3 is threadedly connected to the threaded member. A shaping ring 301 is provided between the driving member 3 and the collar 2 . The inner diameter of the shaping ring 301 is smaller than the outer diameter of the collar 2 .

[0076] The threaded member may be a bolt 1 or a stud. The bolt 1 is taken as an example below. The bolt 1 includes a bolt head 101 and a screw rod 102 . A finite plane 103 is formed on the screw rod 102 .

[0077] If the bolt head 101 has a wrench structure, there is no need to design the bolt 1 to prevent rotation, and the bearing surface diameter can directly adopt the size specified in the national standard or mechanical design manual. If the bolt head 101 is designed without a wrench structure, in order to achieve the function of not restricting the rotation of the bolt head 101 and preventing the bolt 1 from rotating during tightening, the bearing surface diameter It needs to be obtained through the following calculation method:

[0078] Friction torque at the bolt head for:

[0079] ;

[0080] In the formula, is the internal force of the bolt at any time when tightening, is the equivalent friction diameter of the bolt head, is the friction coefficient of the rivet head.

[0081] Friction torque at the thread taking into account the thread lead angle for:

[0082] ;

[0083] In the formula, is the thread pitch diameter, is the thread angle (30° for metric threads), is the thread friction coefficient, is the thread pitch.

[0084] The basic conditions for the bolt to not rotate are:

[0085] ;

[0086] If the bolt does not rotate, the equivalent friction diameter of the bolt head is The following relationship should be satisfied:

[0087] ;

[0088] In the formula, It is the anti-slip safety factor, and its value varies according to the materials of the bolts and connected parts, and its value range is 1-2.

[0089] In some embodiments, the shaping ring 301 is fixedly connected to the driving member 3. In other embodiments, the shaping ring 301 and the driving member 3 are two parts respectively.

[0090] A lubricating layer is provided on the inner side of the shaping ring 301 ; the lubricating layer adopts but is not limited to the existing MoS2 coating, which reduces the friction between the shaping ring 301 and the sleeve ring 2 .

[0091] The inner edge of the shaping ring 301 near the end of the collar 2 adopts a chamfered structure; the outer edge of the collar 2 near the end of the shaping ring 301 adopts a chamfered structure. The chamfered structure of the collar 2 and the chamfered structure of the shaping ring 301 play a guiding role in the process of the shaping ring 301 moving downward, making it easier for the collar 2 to enter the inner side of the shaping ring 301. The hardness and strength of the shaping ring 301 are respectively greater than the hardness and strength of the collar 2, and the hardness and strength of the bolt 1 are respectively greater than the hardness and strength of the collar 2.

[0092] The inner diameter of the collar 2 is smaller than d; the inner side of the collar 2 is provided with an internal thread 202 matching the threaded part, the specification of the internal thread 202 of the collar 2 is consistent with the specification of the external thread of the bolt 1, and the inner diameter of the collar 2 is larger than d3, and the inner wall of the collar 2 is a shallow thread, not a normal thread profile. The inner diameter of the ordinary nut is d3, if the inner diameter of the collar 2 is , then the inner thread 202 of the collar 2 fits perfectly with the outer thread of the bolt 1, leaving no room for plastic deformation; if the inner diameter of the collar 2 , the collar 2 can be directly inserted into the bolt 1 without screwing it in, but this will cause a large distance between the inner wall of the collar 2 and the outer thread of the bolt 1, resulting in excessive torque required during installation.

[0093] The driving member 3 is a hexagonal column structure, which is convenient for installation using a wrench. The driving member 3 is provided with a threaded hole that matches the threaded member.

[0094] There are two limiting planes 103, and the two limiting planes 103 are symmetrically arranged along the axis of the threaded member;

[0095] An annular boss 201 is fixedly provided on the outer side of one end of the collar 2 away from the shaping ring 301, and an anti-skid structure is provided on the end surface of the annular boss 201 away from the shaping ring 301. The annular boss 201 increases the contact surface between the collar 2 and the belt locking member, and the anti-skid structure of the annular boss 201 increases the friction between the collar 2 and the belt locking member. The anti-skid structure can be an anti-skid pattern or an anti-skid rubber pad.

[0096] Due to the existence of the limiting plane 103, the contact area of ​​the thread is reduced, which will affect the bearing capacity of the bolt 1. Therefore, it is necessary to strictly limit the size of the limiting plane 103 to reduce the impact. The calculation formula of the width of the limiting plane 103 is as follows:

[0097] ;

[0098] in, is the width of the limiting plane, for, is the cutting coefficient, A method for installing an anti-loosening threaded fastener comprises the following steps:

[0099] S1. Bolt 1 passes through the connection hole of the fastener 4, and the collar 2 is installed on the outer side of the portion of the bolt 1 protruding from the end surface of the fastener 4;

[0100] S2, the driving member 3 is threadedly connected with the threaded member;

[0101] S3, rotating the driving member 3 in the tightening direction, driving the shaping ring 301 to move downward, and the shaping ring 301 causes the sleeve ring 2 to deform inward to lock the threaded member, and the gap between the inner side of the shaping ring 301 and the limiting plane 103 is reduced.

[0102] A method for disassembling a threaded fastener, comprising the following steps:

[0103] like Figure 8 As shown, the position corresponding to the collar 2 and the limiting plane 103 is cut along the axial direction of the threaded part of the anti-loosening threaded fastener. The following is an example of using a disassembly tool to disassemble the anti-loosening threaded fastener.

[0104] First, rotate the driving member 3 in the loosening direction, and then use a disassembly tool to cut the collar 2, the disassembly tool includes an outer tube 6, an annular limiting boss 601 is fixedly provided on the inner side of the lower end of the outer tube 6, and two cutting knives 602 corresponding to the cutting plane are provided on the inner side of the annular limiting boss 601, and there is a gap between the cutting knife 602 and the limiting plane 103, an inner tube 5 is provided on the inner side of the outer tube 6, the outer diameter of the inner tube 5 matches the outer diameter of the outer tube 6, and the inner side of the inner tube 5 is provided with an internal thread 202 matching the bolt 1, the inner tube 5 is threadedly connected with the bolt 1, and the inner tube 5 is rotated in the tightening direction to drive the outer tube 6 and the cutting knife 602 to move downward, cut the position of the collar 2 corresponding to the limiting plane 103, divide the collar 2 into two arc plates, and recycle the bolt 1 and the driving member 3.

[0105] Beneficial effects:

[0106] First, the durability of the anti-loosening effect is improved, the ring 2 is plastically locked into the thread, and anti-loosening is achieved through permanent deformation. Due to the action of the limiting plane 103, the ring 2 becomes a non-rotating body, and the deformation of the ring 2 in various circumferential directions is different, and rotational loosening cannot occur. The driving member 3 performs secondary locking on the ring 2 to ensure that the material of the ring 2 in the thread will not be deformed again due to loads such as vibration and fatigue, resulting in the ring 2 coming out and the connection structure failing.

[0107] Second, maintain connection performance while ensuring anti-loosening performance

[0108] Although the present invention cuts off part of the threads on both sides of the bolt 1, the cutting ratio is low and the impact on the load-bearing performance is very small; and by replacing the nut with a combination of the collar 2 and the drive member 3, not only the anti-loosening effect is achieved, but also the damage to the overall performance of the bolt 1 connection is reduced. Different from the traditional method of achieving anti-loosening by increasing friction or stress concentration, the ring lock bolt 1 structure achieves excellent anti-loosening performance while maintaining a high-strength connection, and there is no need to compromise between connection strength and anti-loosening performance.

[0109] Third, the installation process is simplified, the operating efficiency is improved, and the tool cost is reduced. The installation steps are exactly the same as those of the ordinary bolt 1. It is only necessary to tighten the shaping nut with a torque wrench. The ordinary bolt 1 needs to control the torque during fine installation, so a torque wrench with a torque measurement function is required; and the installation of the present invention is based on the ring 2 being pressed into the shaping nut, which is intuitive and clear. A torque wrench without any measurement function can be used to ensure installation consistency. Compared with the existing complex anti-loosening structure, the present invention provides an installation method that is simpler than the ordinary bolt 1, which is suitable for large-scale applications and significantly reduces time and tool costs.

[0110] Fourth, it realizes convenient disassembly and protects the connection structure of the bolt 1. Through the disassembly tool, the ring lock bolt 1 can be quickly and smoothly disassembled by only destroying the ring 2, while retaining the integrity of the bolt 1 and the drive member 3, avoiding the problem of difficult disassembly caused by permanent deformation connection. This design makes the equipment more convenient during maintenance and overhaul, ensures the flexibility of operation and the reusability of components, improves the overall maintenance efficiency, and reduces maintenance costs.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 by 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 present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0112] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A threaded fastener, characterized in that: include: A threaded part, wherein a side wall of the threaded part is provided with a limiting plane (103) arranged along the length direction of the threaded part; A collar (2), the collar (2) being mounted on the outside of the threaded member, the inner diameter of the collar (2) being larger than the minor diameter of the thread; A driving member (3), wherein the driving member (3) is threadedly connected to the threaded member, a shaping ring (301) is provided between the driving member (3) and the collar (2), and the inner diameter of the shaping ring (301) is smaller than the outer diameter of the collar (2); The inner diameter of the collar (2) is smaller than the nominal diameter; The inner side of the collar (2) is provided with an internal thread (202) matching the threaded member; The width calculation formula of the limiting plane (103) is as follows: ； in, is the width of the limiting plane, is the nominal diameter, is the cutting coefficient, is the thread pitch; The ring is plastically locked into the thread to prevent loosening through permanent deformation. Due to the effect of the limiting plane, the ring becomes a non-rotating body, and the deformation of the ring in each circumferential direction is different.

2. The anti-loosening thread fastener according to claim 1, characterized in that: The shaping ring (301) is fixedly connected to the driving member (3).

3. The anti-loosening thread fastener according to claim 1, characterized in that: A lubricating layer is provided on the inner side of the shaping ring (301); The inner edge of the shaping ring (301) adjacent to one end of the sleeve ring (2) adopts a chamfered structure; The outer edge of the sleeve ring (2) adjacent to one end of the shaping ring (301) adopts a chamfered structure.

4. The anti-loosening thread fastener according to claim 2, characterized in that: The driving member (3) is a multi-prism structure, and a threaded hole matching the threaded member is formed on the driving member (3).

5. The anti-loosening thread fastener according to claim 1, characterized in that: The number of the limiting planes (103) is two, and the two limiting planes (103) are symmetrically arranged along the axis of the threaded member; An annular boss (201) is fixedly provided on the outer side of one end of the collar (2) away from the shaping ring (301), and an anti-slip structure is provided on the end surface of the annular boss (201) away from the shaping ring (301).

6. A method for installing a threaded fastener, characterized in that: The following steps are involved: S1, the threaded member passes through the connection hole of the fastener (4), and the collar (2) is installed on the outer side of the threaded member; S2, the driving member (3) is threadedly connected to the threaded member; S3, rotating the driving member (3) in the tightening direction, driving the shaping ring (301) to move downward, the shaping ring (301) causes the collar (2) to deform inwardly to lock the threaded member, and the gap between the inner side of the shaping ring (301) and the limiting plane (103) is reduced; The anti-loosening thread fastener is the anti-loosening thread fastener according to any one of claims 1 to 5.

7. A method for disassembling a threaded fastener, characterized in that: The following steps are involved: Cutting the collar (2) at a position corresponding to the limiting plane (103) along the axial direction of the threaded part of the anti-loosening threaded fastener; The anti-loosening thread fastener is an anti-loosening thread fastener installed by the anti-loosening thread fastener installation method described in claim 6.

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