Locking nut with limiting function

Abstract

The utility model provides a locking nut with a limiting function, which comprises a nut body, a threaded hole is arranged on the nut body, a locking hole is arranged on one axial end face of the nut body, and the diameter of the locking hole is gradually reduced from outside to inside. The locking hole is internally connected with an annular locking block, the inner diameter of the locking block is smaller than the diameter of the threaded hole, the outer diameter of the locking block is gradually reduced from one end to the other end, the maximum outer diameter of the locking block is larger than the maximum diameter of the locking hole, and the minimum outer diameter of the locking block is smaller than the maximum diameter of the locking hole; an annular locking ring is arranged on the inner side wall of the locking block, the inner diameter of the locking ring is equal to or smaller than the diameter of the threaded hole, and a disconnecting groove is formed in the locking block. In the screwing process, the locking ring on the locking block does not make contact with the screw rod, when the nut is screwed and makes contact with the fastening face, the locking block makes contact with the fastening face firstly, the locking block enters the locking hole, due to the fact that the diameter of the locking hole is gradually decreased, the locking block is subjected to bundling deformation, the locking ring and the screw rod are subjected to extrusion deformation, and locking fit is formed.

Description

Technical Field

[0001] This utility model relates to the field of hardware fastener technology, specifically to a locking nut with a limiting position. Background Technology

[0002] refer to Figure 1 As shown, this is an existing type of nut with a locking structure.

[0003] The locking nut 01 has a protruding limiting part 03 on the inner side wall of one end of its internal threaded hole 02. As the nut 01 is tightened on the screw, the limiting part 03 will be squeezed against the screw, causing the limiting part 03 to deform, thus generating a locking force.

[0004] However, since nut 01 needs to be rotated a certain distance on the screw before it can be tightened, the limiting part 03 will continuously be squeezed and deformed with the screw during the tightening process, which will cause the following problems: (1) It will cause large-scale damage to the screw (the screw threads will be continuously damaged during the tightening process); (2) The limiting part 03 may cause the locking force to decrease or even be lost due to the continuous squeezing and deformation with the screw (due to the irreversible deformation of the limiting part 03). Utility Model Content

[0005] In view of the problems pointed out in the background art, this utility model proposes a locking nut with a limiting position to solve the above-mentioned technical problems.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A locking nut with a limiting position includes a nut body, on which a threaded hole is provided.

[0008] The nut body has a locking hole on one end face along its axial direction. The locking hole is coaxial with the threaded hole, and the diameter of the locking hole gradually decreases from the outside to the inside.

[0009] A ring-shaped locking block is connected inside the locking hole. The inner diameter of the locking block is smaller than the diameter of the threaded hole. The outer diameter of the locking block gradually decreases from one end to the other. The maximum outer diameter of the locking block is greater than the maximum diameter of the locking hole, and the minimum outer diameter of the locking block is less than the maximum diameter of the locking hole.

[0010] The inner wall of the locking block is provided with an annular locking ring, the inner diameter of which is equal to or smaller than the diameter of the threaded hole, and the locking block is provided with a disconnecting groove.

[0011] The present invention is further configured such that the minimum diameter of the locking hole is greater than the diameter of the threaded hole.

[0012] The present invention is further configured such that, in the axial direction of the threaded hole, the depth of the locking hole is greater than the thickness of the locking block.

[0013] The present invention is further configured such that the locking ring is located at the end of the locking block with a smaller outer diameter.

[0014] The present invention is further configured such that, in the axial direction of the threaded hole, the depth of the locking hole is equal to the thickness of the locking block.

[0015] The present invention is further provided with a locking protrusion on the end face of the lock block with a larger outer diameter.

[0016] The present invention is further configured such that the locking block is made of nylon or metal material.

[0017] The present invention is further configured such that one end of the nut body is thickened in the axial direction.

[0018] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0019] The locking nut with limiting function provided by this utility model is used such that the end of the locking block with the smaller outer diameter is inserted into the locking hole, so that one end of the locking block is inserted into the locking hole and the other end is located outside the locking hole. The nut is gradually tightened on the screw. During the tightening process, the locking ring on the locking block does not contact the screw. When the nut is tightened and contacts the fastening surface, the locking block contacts the fastening surface first and then enters the locking hole. As the diameter of the locking hole gradually decreases, the locking block undergoes a contraction deformation, causing the locking ring and the screw to undergo extrusion deformation, forming a locking fit.

[0020] By adopting the above technical solution, the nut will not contact the screw during the tightening process, and will not damage the threads on the screw. Only during the brief process when the nut is about to be tightened against the fastening surface does the locking block undergo contraction deformation, and the locking ring undergoes extrusion deformation upon contact with the screw. At this time, damage to the threads on the screw may occur, but the area of ​​damage is very small. Furthermore, since the locking ring does not need to undergo continuous extrusion deformation, there will be no problem of reduced or lost locking due to irreversible deformation of the locking ring. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0022] Figure 1 This is a schematic diagram of the existing technology.

[0023] Figure 2This is a schematic diagram of the structure of this utility model.

[0024] Figure 3 This is an exploded view of the present invention.

[0025] Figure 4 This is a schematic diagram of the first implementation structure of the lock block of this utility model.

[0026] Figure 5 This is a schematic diagram of the structure of the locking block of this utility model.

[0027] Figure 6 This is a schematic diagram of the second implementation structure of the locking block of this utility model.

[0028] The following are the labels in the attached diagram: 1. Nut body; 2. Threaded hole; 3. Locking hole; 4. Locking block; 5. Locking ring; 6. Disconnecting groove; 7. Locking protrusion. Detailed Implementation

[0029] 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.

[0030] For reference as follows Figures 1-6 The present invention will be described as follows:

[0031] Example: A locking nut with a limit position includes a nut body 1, on which a threaded hole 2 is provided. The threaded hole 2 is designed to be threadedly connected to a screw and is the core channel for the nut to achieve its fastening function.

[0032] A locking hole 3 is provided on one axial end face of the nut body 1. The locking hole 3 is coaxial with the threaded hole 2, and the diameter of the locking hole 3 gradually decreases from the outside to the inside. This tapered structure design provides the necessary conditions for the subsequent locking action. The minimum diameter of the locking hole 3 is greater than the diameter of the threaded hole 2.

[0033] A circular locking block 4 is connected inside the locking hole 3. The locking block 4 is a key component for realizing the limiting and locking function of the nut. The inner diameter of the locking block 4 is smaller than the diameter of the threaded hole 2, and the outer diameter of the locking block 4 gradually decreases from one end to the other. The maximum outer diameter of the locking block 4 is greater than the maximum diameter of the locking hole 3, and the minimum outer diameter of the locking block 4 is smaller than the maximum diameter of the locking hole 3. This dimensional relationship allows the locking block 4 to be installed in the locking hole 3 in a specific way, that is, the end with the smaller outer diameter can be inserted into the locking hole 3, thereby realizing the installation state of one end inserted and the other end exposed.

[0034] The inner wall of the locking block 4 is provided with an annular locking ring 5. The inner diameter of the locking ring 5 is equal to or smaller than the diameter of the threaded hole 2. The locking block 4 and the locking ring 5 are provided with a disconnecting groove 6. The presence of the disconnecting groove 6 allows the locking block 4 and the locking ring 5 to undergo elastic deformation when subjected to force, which is an important structural feature for realizing the locking function.

[0035] When using this limiting locking nut, first insert the end of the locking block 4 with the smaller outer diameter into the locking hole 3, so that the locking block 4 is in a state where one end is inserted into the locking hole 3 and the other end is outside the locking hole 3. Then screw the nut onto the screw. During the process of gradually tightening the nut, because the inner diameter of the locking ring 5 on the locking block 4 is smaller than the diameter of the threaded hole 2, and the nut is not yet fully tightened, the locking block 4 does not receive enough pressure to deform, so the locking ring 5 will not contact the screw, and the threads on the screw will not be damaged during this stage.

[0036] When the nut is tightened to contact the fastening surface, the locking block 4 at the front end of the nut contacts the fastening surface first. As the tightening force continues to be applied, the nut moves further towards the fastening surface, and the locking block 4 is forced into the locking hole 3 by the reaction force of the fastening surface. Since the diameter of the locking hole 3 gradually decreases from the outside to the inside, the locking block 4 is squeezed by the hole wall during entry, resulting in a contraction deformation. As the locking block 4 contracts, the locking ring 5 on it also deforms, making close contact with the screw surface and undergoing compression deformation. This creates a strong frictional force between the screw and the locking ring 5, achieving a locking fit between the nut and the screw and preventing the nut from loosening during use.

[0037] In the background technology, during the tightening process of the nut, the limiting part 03 continuously contacts and rubs against the screw, which can easily lead to wear, deformation, and other damage to the threads on the screw, affecting the reliability and service life of the connection. However, in this limiting locking nut, there is no direct contact between the nut and the screw during the tightening process. Only during the brief moment when the nut is about to come into contact with the fastening surface to complete the tightening, does the locking block 4 undergo contraction deformation, and the locking ring 5 contacts and deforms against the screw. Therefore, the screw threads are damaged for a short time and within a small area, greatly reducing the risk of thread damage, effectively protecting the screw, and extending the overall service life of the screw and nut.

[0038] Since the locking ring 5 does not need to undergo continuous compression deformation throughout the entire tightening process of the nut, but only undergoes brief elastic deformation in the final locking stage, irreversible deformation due to long-term stress will not occur. This avoids the problem of reduced or lost locking force caused by irreversible deformation of the locking ring 5, ensuring that the nut maintains a stable and reliable locking state during use, and improving the safety and stability of the connection structure.

[0039] Implementation Structure 1:

[0040] In the axial direction of the threaded hole 2, the depth of the locking hole 3 is greater than the thickness of the locking block 4.

[0041] In the axial direction of the threaded hole 2, when the depth of the locking hole 3 is greater than the thickness of the locking block 4, this dimensional relationship provides sufficient space for the movement of the locking block 4 within the locking hole 3. During installation, the end of the locking block 4 with the smaller outer diameter is inserted into the locking hole 3. Because the depth of the locking hole 3 has a margin, the end of the locking block 4 with the larger outer diameter will not contact the bottom of the locking hole 3 when it is not under force, and part of the structure of the locking block 4 will be exposed outside the locking hole 3.

[0042] During the tightening of the nut, as the nut approaches the fastening surface, the exposed portion of the locking block 4 first contacts the fastening surface. At this time, the axial pressure generated by the continued tightening of the nut causes the locking block 4 to move into the locking hole 3. Because the diameter of the locking hole 3 gradually decreases from the outside to the inside, the locking block 4 is constrained by the hole wall during its movement, resulting in a contraction deformation, which causes the inner locking ring 5 to engage with the screw. Since the depth of the locking hole 3 is greater than the thickness of the locking block 4, the locking block 4 has sufficient travel distance throughout the entire locking process, fully realizing the contraction deformation and ensuring a stable and reliable locking force between the locking ring 5 and the screw.

[0043] Implementation Structure Two:

[0044] In the axial direction of the threaded hole 2, the depth of the locking hole 3 is equal to the thickness of the locking block 4.

[0045] The locking block 4 has a locking protrusion 7 on its larger outer diameter end face. After the locking block 4 is fully inserted into the locking hole 3, the front end face of the locking block 4 abuts against the fastening surface, and the locking protrusion 7 is squeezed and deformed, thus locking the fit.

[0046] In the initial stage of tightening the nut, the locking ring 5 on the locking block 4 does not contact the screw, and the screw thread will not be damaged.

[0047] When the nut is tightened to contact the fastening surface, the front end face of the locking block 4 abuts against the fastening surface. At this time, the axial force continued to be applied by the nut acts directly on the locking block 4, and the locking block 4 enters the locking hole 3 until it can no longer move into the hole. At this time, the locking protrusion 7 provided on the larger diameter end face of the locking block 4 plays a key role in this process. As the pressure increases, the locking protrusion 7 is deformed by the pressure of the fastening surface. This deformation increases the friction between the locking block 4 and the fastening surface, forming a firm locking fit.

[0048] The locking ring 5 is located at the end of the locking block 4 with the smaller outer diameter. During the tightening of the nut, the end of the locking block 4 with the smaller outer diameter is inserted into the locking hole 3 first, and is in a suspended or partially embedded state before the nut is fully tightened. At this time, the locking ring 5 remains in a non-contact state with the screw, avoiding wear on the screw thread during the initial tightening of the nut. When the nut is tightened to contact the fastening surface, the locking block 4 is squeezed and moves into the locking hole 3. Since the locking hole 3 has an inwardly tapered structure, the locking block 4 and the locking ring 5 at the end with the smaller outer diameter are constrained by the hole wall first and undergo contraction deformation. This arrangement allows the locking ring 5 to accurately engage with the screw during the fully tightened stage of the nut, ensuring the locking function is achieved while minimizing the time and extent of damage to the screw thread.

[0049] Lock block 4 is made of nylon or metal.

[0050] The locking block 4 is made of nylon material, primarily utilizing its unique physicochemical properties. Nylon possesses excellent elasticity and wear resistance. During the contraction deformation of the locking block 4, the nylon material can tightly adhere to the screw surface through its own elastic deformation, forming reliable friction to achieve locking. Simultaneously, the low hardness of nylon prevents scratching or damage to the screw surface when it comes into contact with and is compressed against the screw, effectively protecting the screw threads.

[0051] The use of metal to manufacture the locking block 4 emphasizes its high strength and rigidity. Metal can withstand greater axial pressure and compressive force. Under high-load conditions, the metal locking block 4 can ensure a stable structural shape during the tightening of the nut, preventing plastic deformation or breakage due to excessive force.

[0052] One end of the nut body 1 is thickened along the axial direction. The thickened part increases the contact area between the nut and the fastening surface. During the tightening process, the axial pressure can be distributed more evenly on the fastening surface, reducing the pressure per unit area and minimizing indentations and damage to the fastening surface.

[0053] The above description is only a preferred 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 locking nut with a limiting function, comprising a nut body having a threaded hole thereon, characterized in that: The nut body has a locking hole on one end face along its axial direction. The locking hole is coaxial with the threaded hole, and the diameter of the locking hole gradually decreases from the outside to the inside. A ring-shaped locking block is connected inside the locking hole. The inner diameter of the locking block is smaller than the diameter of the threaded hole. The outer diameter of the locking block gradually decreases from one end to the other. The maximum outer diameter of the locking block is greater than the maximum diameter of the locking hole, and the minimum outer diameter of the locking block is less than the maximum diameter of the locking hole. The inner wall of the locking block is provided with an annular locking ring, the inner diameter of which is equal to or smaller than the diameter of the threaded hole, and the locking block is provided with a disconnecting groove.

2. A locking nut with a limiting position according to claim 1, characterized in that: The minimum diameter of the locking hole is greater than the diameter of the threaded hole.

3. A locking nut with a limiting position according to claim 1, characterized in that: In the axial direction of the threaded hole, the depth of the locking hole is greater than the thickness of the locking block.

4. A locking nut with a limiting position according to claim 1, characterized in that: The locking ring is located at the end of the locking block with the smaller outer diameter.

5. A locking nut with a limiting position according to claim 1, characterized in that: In the axial direction of the threaded hole, the depth of the locking hole is equal to the thickness of the locking block.

6. A locking nut with a limiting position according to claim 5, characterized in that: The locking block has a locking protrusion on its larger outer diameter end face.

7. A locking nut with a limiting position according to claim 1, characterized in that: The locking block is made of nylon or metal.

8. A locking nut with a limiting position according to claim 1, characterized in that: The nut body has one end thickened in the axial direction.

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