Locking nut

Abstract

The utility model discloses a kind of anti-loose back-off nuts, including bolt mounting plate, fixed bolt is threadedly connected on the bolt mounting plate, one end of the fixed bolt is provided with tailstock, back-off nut one and back-off nut two are respectively provided on the fixed bolt, the inner side of back-off nut one and back-off nut two is all provided with the internal thread of fixed bolt thread connection, inclined slope one and inclined boss one are respectively provided on back-off nut one.The utility model in the present application, by two back-off nuts are tightened to fixed bolt, can form double friction between nut and between nut and bolt after tightening, preliminarily prevent loosening, by the mutual engagement of slope and boss on two back-off nuts, form a "wedge-shaped locking" effect, so when nut has loosening tendency, radial extrusion force will be generated between slope and boss, further hold bolt, while limit nut reverse rotation, substantially improve the fastening of bolt nut.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts technology, and in particular to an anti-loosening and anti-reverse nut. Background Technology

[0002] A bolt is a fastener with a head and a shank with external threads. It is usually used to pass through the through hole of the connected parts and is used with a nut to achieve a detachable connection. Some bolts (such as anchor bolts) can also be directly screwed into the base with internal threads. In the field of mechanical connection, the combination of bolts and nuts is one of the core ways to fix parts. Mechanical equipment typically experiences stresses such as vibration, impact, and alternating loads during use (e.g., in construction machinery, rail transportation, automotive parts, and other equipment operation scenarios). Conventional bolts and nuts are prone to loosening due to the decrease in friction between the threaded pairs, leading to connection failure and even equipment malfunctions or safety accidents, thus compromising safety. Therefore, to address this issue, this application proposes an anti-loosening nut. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an anti-loosening and anti-retraction nut.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a locking nut, comprising a bolt mounting plate, a fixing bolt threadedly connected to the bolt mounting plate, a tailstock provided at one end of the fixing bolt, a locking nut one and a locking nut two respectively provided on the fixing bolt, the inner sides of the locking nut one and the locking nut two are provided with internal threads that are threadedly connected to the fixing bolt, the locking nut one is provided with an inclined slope one and an inclined boss one respectively, and the locking nut two is provided with an inclined slope two and an inclined boss two respectively.

[0005] As a further description of the above technical solution: The inclined protrusion one and the inclined slope two are spliced ​​together.

[0006] As a further description of the above technical solution: The inclination angles of the first and second inclined slopes are 10°-25°.

[0007] As a further description of the above technical solution: Both the first inclined boss and the second inclined boss have rounded corners at one end.

[0008] As a further description of the above technical solution: An extended wing plate is fixedly connected to the outer surface of the anti-reverse nut.

[0009] As a further description of the above technical solution: An additional washer is fitted onto the outer surface of the fixing bolt.

[0010] This utility model has the following beneficial effects: This anti-loosening and anti-reverse nut works by tightening two anti-reverse nuts onto a fixing bolt. This causes the upper and lower sides of anti-reverse nut one to fit and press against anti-reverse nut two and the mechanical equipment housing, respectively, and also against the tailstock. This creates a double friction force between the nuts and between the nuts and the bolt after tightening, initially preventing loosening. The bevels and bosses on the two anti-reverse nuts interlock to form a "wedge-shaped locking" effect. When the nuts tend to loosen, a radial compressive force is generated between the bevels and bosses, further tightening the bolt and restricting the reverse rotation of the nuts, thus significantly improving the tightness of the bolt and nut. The entire structure utilizes both the "friction force of the double nuts" and the "wedge-shaped locking force of the inclined boss," resulting in more stable anti-loosening capabilities than ordinary single nuts / simple double nuts. It is especially suitable for harsh working conditions such as vibration and impact. Moreover, the engagement between the inclined surface and the boss is a mechanical anti-loosening mechanism (not dependent on friction), and the anti-loosening effect is not affected by the decay of preload. It has high stability over long-term use. In addition, the structure of the boss and the inclined surface experiences minimal wear and can maintain good anti-loosening performance even after multiple disassemblies and reassemblies (unlike disposable locking washers). It is durable and requires no additional tools (such as cotter pins or locking washers). Simply tighten the two nuts in sequence, and the anti-loosening is achieved through the automatic engagement of the boss and the inclined surface. The operation is simple, efficient, and convenient. Finally, it retains the internal thread and hexagonal shape of ordinary nuts, allowing it to be matched with conventional bolts without changing bolt specifications. It is highly versatile and suitable for widespread adoption. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of an anti-loosening and anti-retraction nut proposed in this utility model; Figure 2 This is a schematic diagram of the anti-loosening and anti-retraction nut structure proposed in this utility model, showing how the anti-retraction nut is screwed onto a bolt. Figure 3 This is a schematic diagram of the anti-loosening and anti-retraction nut and fixing bolt structure proposed in this utility model; Figure 4 This utility model provides a schematic diagram of the structure of two anti-loosening and anti-retracting nuts: anti-retracting nut one and anti-retracting nut two. Figure 5 This is a schematic diagram of the installation of an additional washer for an anti-loosening and anti-reverse nut proposed in this utility model.

[0012] Legend: 1. Bolt mounting plate; 2. Fixing bolt; 3. Tailstock; 4. Anti-reverse nut one; 5. Anti-reverse nut two; 6. Internal thread; 7. Inclined slope one; 8. Inclined boss one; 9. Inclined slope two; 10. Inclined boss two; 11. Rounded corner; 12. Extended wing plate; 13. Additional pad. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. 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 an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0015] Reference Figure 1-5 Embodiment 1 of this utility model: A locking nut for preventing loosening includes a bolt mounting plate 1, a fixing bolt 2 threadedly connected to the bolt mounting plate 1, a tail seat 3 provided at one end of the fixing bolt 2, the tail seat 3 and the fixing bolt 2 are integrated into a conventional bolt structure, and a locking nut 4 and a locking nut 5 are respectively provided on the fixing bolt 2. The inner sides of the locking nut 4 and the locking nut 5 are provided with internal threads 6 that are threadedly connected to the fixing bolt 2. The overall structure of the locking nut is a conventional nut structure. The internal threads 6 on the inner sides can make the nut structure stably screwed onto the fixing bolt 2, so that the structure can be used for normal connection. The anti-reverse nut 4 is provided with an inclined slope 7 and an inclined boss 8, and the anti-reverse nut 5 is provided with an inclined slope 9 and an inclined boss 10. The inclined slope and the inclined boss are formed by cutting the surface of the conventional nut at an angle, thus forming a boss inclined surface structure. The inclination angle of the inclined slope 7 and the inclined slope 9 is 10°-25°, and the inclination angle can be set according to the requirements, preferably 15°, as shown in the attached figure. Figure 4 As shown, both inclined boss 18 and inclined boss 20 have a rounded corner 11 at one end. The corner of the boss is set in an arc shape, which can reduce the rigid contact after the nut structure is connected and reduce wear. Inclined boss 18 and inclined slope 29 are spliced ​​together, and inclined boss 20 and inclined slope 17 are spliced ​​together. The upper and lower anti-loosening nuts are rotated and spliced ​​relative to each other, so that the boss and the slope are spliced ​​together, which can form an interlocking effect. The entire structure adopts a composite anti-loosening form of "double nut + slope / boss interlocking": 1. By tightening both nuts onto the bolt, after tightening, a double friction force is formed between the nuts and between the nuts and the bolt, which initially prevents loosening; 2. The slopes on the two anti-loosening nuts interlock with the bosses to form a "wedge locking" effect. When the nut has a tendency to loosen, a radial compressive force is generated between the slope and the boss, which further tightens the bolt and restricts the reverse rotation of the nut, which greatly improves the tightness of the bolt and nut.

[0016] Example 2: An extension wing plate 12 is fixedly connected to the outer surface of the anti-loosening nut 4. The extension wing plate 12 adds a structural part to the surface of the nut, which can increase the force-bearing area between the nut and the mounting plate or mechanical housing. The surface of the wing plate can be provided with anti-slip ridges, which can enhance the friction and, to a certain extent, help to enhance the anti-loosening effect and prevent loosening and slippage. An additional washer 13 is sleeved on the outer surface of the fixing bolt 2. The additional washer 13 can be set according to the requirements. Different additional washer 13s can be set according to different requirements. For example, metal plate washer, rubber washer, spring washer, etc. can be set to help enhance the stability of the bolt structure installation.

[0017] Working principle: When using the anti-loosening lock nut, first screw the lock nut 25 onto the fixing bolt 2, then screw the lock nut 4 onto the fixing bolt 2, so that the inclined slope 7 and the inclined boss 10, and the inclined slope 9 and the inclined boss 8 are joined together. This allows the two lock nuts to mesh together. After tightening, tighten the fixing bolt 2 onto the mechanical equipment, so that the bottom of the lock nut 4 is attached to the surface of the mechanical equipment housing. This completes the tightening and fixing of the bolt.

[0018] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 locking nut, comprising a bolt mounting plate (1), characterized in that: The bolt mounting plate (1) is threaded with a fixing bolt (2). One end of the fixing bolt (2) is provided with a tailstock (3). The fixing bolt (2) is provided with a first anti-reverse nut (4) and a second anti-reverse nut (5). The inner sides of the first anti-reverse nut (4) and the second anti-reverse nut (5) are provided with internal threads (6) that are threaded to the fixing bolt (2). The first anti-reverse nut (4) is provided with an inclined slope (7) and an inclined boss (8). The second anti-reverse nut (5) is provided with an inclined slope (9) and an inclined boss (10).

2. The anti-loosening nut according to claim 1, characterized in that: The inclined boss one (8) and the inclined slope two (9) are spliced ​​together, and the inclined boss two (10) and the inclined slope one (7) are spliced ​​together.

3. The anti-loosening nut according to claim 1, characterized in that: The inclination angle between the first inclined slope (7) and the second inclined slope (9) is 10°-25°.

4. The anti-loosening nut according to claim 1, characterized in that: Both the first inclined boss (8) and the second inclined boss (10) have rounded corners (11) at one end.

5. The anti-loosening nut according to claim 1, characterized in that: An extension wing plate (12) is fixedly connected to the outer surface of the anti-reverse nut (4).

6. The anti-loosening nut according to claim 1, characterized in that: An additional washer (13) is fitted onto the outer surface of the fixing bolt (2).

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