Bidirectional thread dynamic locking locknut assembly

Abstract

The utility model belongs to the technical field of fasteners, and provides a bidirectional thread dynamic locking locknut assembly which comprises a screw, a main nut and an auxiliary nut, and the screw comprises a main rod, an auxiliary rod and a hexagonal head; by means of the innovative double-nut design and the reverse thread structure, the automatic locking function under the high-frequency vibration and high-cold and high-temperature environment is achieved, namely the characteristic that the nut is tighter along with vibration is achieved, the problem that the nut is loosened is effectively solved, meanwhile, the assembly can be produced through the conventional turning and thread machining technology, and the production cost is reduced. Special equipment or complex processes are not needed, large-scale popularization and application are facilitated, cost is low, machining is easy and convenient, mounting and dismounting can be easily completed through a conventional tool, professional skills or special tools are not needed, good adaptability to high-cold and high-temperature environments is achieved, and the connector is suitable for various scenes needing high-reliability connection; and particularly, the device has obvious advantages under high-frequency vibration and extreme environment conditions.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fastener, concretely is a kind of two-way thread dynamic locking lock nut assembly. BACKGROUND

[0002] When traditional bolt and nut bear high-frequency vibration for a long time or are in high cold and high temperature environment, it is often loose due to material fatigue, thermal expansion and contraction and other factors, and further causes connection failure, even safety accident. Although there are some lock bolt and nut products on the market, there are generally problems of high cost, complex processing, poor lock effect or poor adaptability.

[0003] Therefore, the person skilled in the art proposes a two-way thread dynamic locking lock nut assembly to solve the problems raised in the background art.

[0004] The above information disclosed in the background art is only used to increase the understanding of the background art of the utility model, and therefore, it can include prior art known by those skilled in the art. CONTENT OF UTILITY MODEL

[0005] In order to solve the above technical problems, the utility model provides a two-way thread dynamic locking lock nut assembly to solve the problem that traditional bolt and nut are often loose due to material fatigue, thermal expansion and contraction and other factors when they bear high-frequency vibration for a long time or are in high cold and high temperature environment in the prior art.

[0006] To achieve the above purpose, the utility model provides a two-way thread dynamic locking lock nut assembly, which comprises a screw rod, a main nut and a secondary nut. The screw rod comprises a main rod, a secondary rod and a hexagonal head. The main rod is externally provided with a main thread, and the secondary rod is externally provided with a secondary thread opposite to the main thread in direction. The main nut is internally provided with a first internal thread matched with the main thread, and the secondary nut is internally provided with a second internal thread matched with the secondary thread. The main nut and the secondary nut are respectively matched on the main rod and the secondary rod through thread, and there is dynamic locking cooperation between the main nut and the secondary nut.

[0007] Preferably, the diameter of the secondary rod is smaller than that of the main rod.

[0008] Preferably, the pitch of the main thread and the secondary thread is adapted to dynamic locking function, the main thread and the secondary thread are adapted to two-way locking thread form, and the diameter of the secondary nut is smaller than that of the main nut.

[0009] Preferably, the main nut and the secondary nut are both made of metal material.

[0010] Preferably, the main nut is made of 42CrMo alloy steel, and the secondary nut is made of 17-4PH stainless steel.

[0011] Preferably, the secondary nut is externally provided with a hardened layer.

[0012] Preferably, the primary nut and the secondary nut can also be made of engineering plastics.

[0013] Preferably, the engineering plastics material is glass fiber reinforced nylon, and the engineering plastics also contains nano-silica additives.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model discloses a double-nut design and reverse thread structure, realizing the automatic locking function under high-frequency vibration and high cold and high temperature environment, that is, the more vibration, the tighter, effectively solving the problem of nut loosening, and the utility model component can be produced by using conventional turning and thread processing technology, without special equipment or complex process, being favorable for large-scale popularization and application, low in cost, simple in processing, easy to install and dismount by using conventional tools, without professional skill or special tool, and having good adaptability to high cold and high temperature environment, being applicable to various scenes needing high reliability connection, especially having remarkable advantages under high-frequency vibration and extreme environment conditions.

[0016] The above summary is only for the purpose of the description and is not intended to limit in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features will become apparent to those skilled in the art upon consideration of the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic diagram of a bidirectional thread dynamic locking locknut assembly in the embodiment of the utility model;

[0018] Figure 2 It is a sectional view of a bidirectional thread dynamic locking locknut assembly in the embodiment of the utility model;

[0019] Figure 3 It is a partial structure schematic diagram of a bolt of a bidirectional thread dynamic locking locknut assembly in the embodiment of the utility model;

[0020] Figure 4 It is a whole structure exploded schematic diagram of a bidirectional thread dynamic locking locknut assembly in the embodiment of the utility model;

[0021] Figure 5 It is a sectional view of a secondary nut of a bidirectional thread dynamic locking locknut assembly in the embodiment of the utility model.

[0022] In the drawing:

[0023] 1. Screw; 11. Main rod; 12. Main thread; 13. Secondary rod; 14. Secondary thread; 15. Hexagonal head; 2. Main nut; 21. First internal thread; 3. Secondary nut; 31. Secondary internal thread; 32. Hardened layer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. It should be noted that the drawings are schematic and not illustrated to scale. For clarity and convenience, the relative sizes and proportions of the parts shown in the drawings have been exaggerated or reduced in size. Any size is only illustrative and not limiting.

[0025] Example:

[0026] Please see Figure 1 - Figure 5 As shown, a bidirectional threaded dynamic locking anti-loosening nut assembly includes a screw rod 1, a main nut 2, and a secondary nut 3. The screw rod 1 includes a main rod 11, a secondary rod 13, and a hexagonal head 15. The main rod 11 has a main thread 12 on its exterior, and the secondary rod 13 has a secondary thread 14 on its exterior, which is opposite in direction to the main thread 12. The main nut 2 has a first internal thread 21 that matches the main thread 12 on its interior, and the secondary nut 3 has a second internal thread 31 that matches the secondary thread 14 on its interior. The main nut 2 and the secondary nut 3 are threaded onto the main rod 11 and the secondary rod 13, respectively, and there is a dynamic locking fit between the main nut 2 and the secondary nut 3. The main rod 11 is the main part of the screw rod 1, and its main thread 12 is used to mate with the main nut 2, providing basic connection and fastening functions. The length and pitch design of the main thread 12 ensures that the main nut 11... Nut 2 can be tightened on it and provides sufficient preload to meet the connection requirements of the equipment. The secondary thread 14 on the secondary rod 13 is opposite in direction to the main thread 12. When the main nut 2 tends to loosen under vibration or temperature changes, the secondary thread 14 generates additional locking force through reverse engagement with the secondary nut 3 to prevent the main nut 2 from loosening. The hexagonal head 15 is used to engage with tools such as wrenches to facilitate the installation and removal of the screw 1, ensuring that the tightening and loosening of the screw 1 is simple and quick. The main nut 2 matches the main thread 12 of the main rod 11 through the first internal thread 21 to tighten the screw 1 and provide the main fastening force. The tightening of the main nut 2 is the basis for the fastening of the entire assembly. The secondary nut 3 matches the secondary thread 14 of the secondary rod 13 through the second internal thread 31, and achieves dynamic locking function through the reverse thread structure.

[0027] Specifically, the diameter of the secondary rod 13 is smaller than the diameter of the main rod 11.

[0028] Further, the main thread 12 and the secondary thread 14 are both adapted to the dynamic locking function, the main thread 12 and the secondary thread 14 are both adapted to the bidirectional locking thread form, the diameter of the secondary nut 3 is smaller than the diameter of the main nut 2.

[0029] Further, the main nut 2 and the secondary nut 3 are both made of metal material.

[0030] Further, the main nut 2 is made of 42CrMo alloy steel, and the secondary nut 3 is made of 17-4PH stainless steel, 42CrMo alloy steel is a high-strength alloy steel with high tensile strength (≥800MPa) and good yield strength, while maintaining high toughness, can maintain shape under high-strength preload, without plastic deformation, the main nut 2 needs to withstand a large preload during tightening, high strength and high toughness 42CrMo alloy steel can ensure that the main nut 2 will not break due to stress concentration when tightening, and can also maintain the integrity of the structure in a high-frequency vibration environment, 42CrMo alloy steel is quenched and tempered (such as HRC 28-32) after treatment, the surface hardness is moderate, and has good wear resistance, during dynamic locking, the main nut 2 and the main thread 12 of the screw rod 1 will move relative to each other, good wear resistance can reduce thread wear and prolong the service life of the nut;

[0031] 17-4PH stainless steel is a precipitation hardening stainless steel with high strength (tensile strength ≥800MPa) and good corrosion resistance, after solid solution aging treatment, it can achieve high hardness and strength, while maintaining good toughness, the secondary nut 3 needs to work with the main nut 2 during dynamic locking, high strength and good corrosion resistance can ensure that the secondary nut 3 can maintain good performance in high cold and high temperature environment (such as-60℃~200℃), 17-4PH stainless steel is suitable for surface hardening treatment, such as nitriding treatment. After nitriding treatment, a hard layer 32 (such as 50-80μm) with high hardness is formed on the surface, which can significantly improve the wear resistance and anti-seizure of the nut, during dynamic locking, the secondary nut 3 and the secondary thread 14 of the screw rod 1 will move relative to each other, the surface hardening layer 32 can effectively reduce thread wear and prevent thread seizure, prolonging the service life of the secondary nut 3, the main nut 2 and the secondary nut 3 can be produced by conventional turning and thread processing technology, without special equipment or complex process.

[0032] Further, the secondary nut 3 has a hardening layer 32 on the surface, the hardening layer 32 is formed by nitriding treatment, which improves the surface hardness and wear resistance of the secondary nut 3, and enhances the corrosion resistance, ensuring good locking effect in harsh environment.

[0033] The working principle is that the main nut 2 and the auxiliary nut 3 are sequentially sleeved on the main rod 11 and the auxiliary rod 13 of the screw rod 1, the main nut 2 is screwed on the main thread 12, and the auxiliary nut 3 is screwed on the auxiliary thread 14. According to the direction of the main thread 12 and the auxiliary thread 14, the main nut 2 is tightened clockwise, the auxiliary nut 3 is tightened counterclockwise, or the main nut 2 is tightened counterclockwise, and the auxiliary nut 3 is tightened clockwise. The main nut 2 provides the main tightening force, and the auxiliary nut 3 is in standby state and is ready to play a role when vibration or temperature change occurs. When the equipment is in high-frequency vibration or high-temperature environment, the main nut 2 may have a loosening trend due to the vibration force being greater than the torque force. Since the auxiliary nut 3 and the auxiliary rod 13 are connected by reverse threads, the movement of the main nut 2 actually increases the friction between the main nut 2 and the screw rod 1. This increased friction automatically locks the main nut 2 to prevent it from loosening. Since the threads of the main nut 2 and the auxiliary nut 3 are opposite, the main nut 2 and the auxiliary nut 3 will be more and more tightly combined together during the vibration process. This synergistic effect further enhances the locking effect of the assembly, ensuring that reliable connection can be maintained under extreme conditions. When tightening the nut, the nut may not be tightened due to special working conditions. Spacers can be added to enable tightening. The main nut 2 is made of 42CrMo alloy steel, and the auxiliary nut 3 is made of 17-4PH stainless steel and is subjected to special treatment. These materials can effectively resist material fatigue and corrosion in high-temperature and high-temperature environments, ensuring the reliability of the assembly under extreme conditions. The hardening layer 32 on the surface of the auxiliary nut 3 improves the surface hardness and wear resistance. In high-temperature and high-temperature environments, the hardening layer 32 can effectively prevent thread wear and corrosion, prolonging the service life of the assembly.

[0034] The main nut 2 and the auxiliary nut 3 can also be made of engineering plastics. The engineering plastic material is glass fiber reinforced nylon, and the engineering plastic also contains a nano-silicon dioxide additive. The glass fiber reinforced nylon has high mechanical strength and wear resistance. The addition of glass fiber significantly improves the tensile strength and impact resistance of nylon, enabling it to withstand a large amount of pre-tightening force and dynamic locking force. The nano-silicon dioxide additive further enhances the wear resistance and fatigue resistance of the material, reducing thread wear during dynamic locking and prolonging the service life of the nut. The main nut 2 and the auxiliary nut 3 are made of engineering plastics and are processed by injection molding and other processes, which has high production efficiency and low processing cost. Compared with metal materials, injection molding can quickly produce complex shapes and structures without the need for complex mechanical processing. Metal nuts usually need to be surface treated to improve wear resistance and corrosion resistance, while engineering plastic nuts have good surface properties and do not need additional surface treatment, further reducing production costs and being suitable for lightweight fields such as unmanned aerial vehicles, toys, and robot joints.

[0035] From the above, through the innovative double-nut design and reverse thread structure, the automatic locking function in the high-frequency vibration and high-temperature environment is realized, that is, the more vibration, the tighter, effectively solving the problem of nut loosening, at the same time, the assembly of the utility model can be produced by using conventional turning and thread processing technology, without special equipment or complex process, which is conducive to large-scale popularization and application, low cost, simple processing, installation and disassembly can be easily completed by using conventional tools, without professional skills or special tools, and has good adaptability to high-temperature environment, suitable for various scenes requiring high reliability connection, especially has significant advantages in high-frequency vibration and extreme environment conditions.

[0036] The standard parts used in the utility model can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here. The contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0037] The utility model discloses the drawings in the embodiment, only relate to the structure involved in the embodiment of the disclosure, other structures can refer to the usual design, under the condition of not conflicting, the same embodiment and different embodiments of the utility model can be combined with each other.

[0038] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A bidirectional threaded dynamic locking nut assembly comprising a screw rod (1), a main nut (2) and a secondary nut (3), characterized in that: The screw (1) comprises a main rod (11), a sub-rod (13) and a hexagonal head (15), the main rod (11) is externally provided with a main thread (12), the sub-rod (13) is externally provided with a sub-thread (14) opposite to the direction of the main thread (12), the main nut (2) is internally provided with a first internal thread (21) matched with the main thread (12), the sub-nut (3) is internally provided with a second internal thread (31) matched with the sub-thread (14), the main nut (2) and the sub-nut (3) are threadedly matched on the main rod (11) and the sub-rod (13) respectively, and the main nut (2) and the sub-nut (3) are dynamically locked.

2. A bidirectional threaded dynamic locking nut assembly as claimed in claim 1, wherein: The diameter of the sub-rod (13) is smaller than that of the main rod (11).

3. A bidirectional threaded dynamic locking nut assembly as claimed in claim 2, wherein: The pitches of the main thread (12) and the sub-thread (14) are adapted to the dynamic locking function, the main thread (12) and the sub-thread (14) are adapted to the thread form of bidirectional locking, and the diameter of the sub-nut (3) is smaller than that of the main nut (2).

4. A bidirectional threaded dynamic locking nut assembly as claimed in claim 3, wherein: The main nut (2) and the sub-nut (3) are both made of metal materials.

5. A bidirectional threaded dynamic locking nut assembly as claimed in claim 4, wherein: The main nut (2) is made of 42CrMo alloy steel, and the sub-nut (3) is made of 17-4PH stainless steel.

6. A bidirectional threaded dynamic locking nut assembly as claimed in claim 5, wherein: The sub-nut (3) is externally provided with a hardened layer (32).

7. A bidirectional threaded dynamic locking nut assembly as claimed in claim 1, wherein: The main nut (2) and the sub-nut (3) can also be made of engineering plastics.

8. A bidirectional threaded dynamic locking nut assembly as claimed in claim 7, wherein: The engineering plastic material is glass fiber reinforced nylon, and the engineering plastic further comprises a nano-silicon dioxide additive. The engineering plastic material is glass fiber reinforced nylon, and the engineering plastic further comprises a nano-silicon dioxide additive.

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