Lock bolt and nut assembly

Abstract

The lock bolt and nut assembly comprises a bolt and a main nut, the bolt comprises a bolt head, a main screw fixedly connected with the bolt head and a lock screw fixedly connected with the main screw, the main screw and the lock screw are opposite in thread turning direction, the main nut is in threaded connection with the main screw, and the lock nut is in threaded connection with the lock screw. The lower end of the main nut and the upper end of the lock nut are provided with lock helical teeth which are matched with each other. Through the design that the main screw and the anti-loosening screw are opposite in thread screwing direction and the main nut and the anti-loosening nut are provided with the anti-loosening helical teeth on the relatively close surfaces, the main nut can achieve the anti-loosening effect, the anti-loosening nut also achieves the anti-loosening effect at the same time, and therefore it can be guaranteed that the main nut cannot loosen for a long time, work is stable and reliable, the anti-loosening effect is good, use is convenient, and production and manufacturing can be achieved; and the practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical connection fasteners, and specifically refers to a lock - preventing bolt - nut assembly. Background Art

[0002] The existing bolt - nut assembly is composed of a bolt with external threads and a nut with internal threads. It is easy to install and disassemble, but its functions of preventing loosening, detachment and shock absorption are poor.

[0003] In various equipment and devices such as mechanical devices, bridge piers, iron towers, ships, automobiles, aircraft, etc., fasteners are often used to combine two or more components. The bolt - nut assembly is a commonly used fastener. At present, most bolt - nut assemblies adopt the connection and fastening method of ordinary bolts and nuts, that is, an ordinary bolt pair. When using a bolt pair for connection and fastening, if vibration or impact is continuously applied to the joint from the outside in the state where the bolt and the nut are combined, the phenomenon that the bolt and the nut gradually loosen along the opposite direction of the thread combination may occur. The loosening problem of the ordinary bolt pair is very serious and often causes major accidents. If it is not discovered and repaired in time, it will lead to insecure connection or the bolt and nut falling off, resulting in major safety accidents and incalculable losses. To solve this problem, generally, anti - loosening helical teeth are provided on the bolt and nut at present, or an anti - loosening gasket is sleeved between the bolt and nut. Although this can play a certain role in preventing loosening, loosening still occurs when receiving vibration or impact for a long time. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above - mentioned technical defects and provide a lock - preventing bolt - nut assembly.

[0005] To solve the above - mentioned technical problem, the technical solution provided by the present invention is a lock - preventing bolt - nut assembly: including a bolt and a main nut. The bolt includes a bolt head, a main screw rod fixedly connected to the bolt head, and an anti - loosening screw rod fixedly connected to the main screw rod. The thread directions of the main screw rod and the anti - loosening screw rod are opposite. The main nut is thread - connected to the main screw rod, and an anti - loosening nut is thread - connected to the anti - loosening screw rod. Anti - loosening helical teeth that cooperate with each other are provided at the lower end of the main nut and the upper end of the anti - loosening nut.

[0006] Furthermore, the diameter of the main screw rod is greater than that of the anti - loosening screw rod. A threaded hole that matches the thread on the anti - loosening screw rod is provided at the lower part of the anti - loosening nut, and a through - hole that penetrates through the threaded hole is provided at the upper part of the anti - loosening nut. The diameter of the through - hole is greater than the outer diameter of the main screw rod to meet different thickness requirements.

[0007] The advantages of the present invention compared with the prior art are as follows: By designing the opposite thread directions of the main screw and the anti-loosening screw, and the anti-loosening inclined teeth on the relatively close surfaces of the main nut and the anti-loosening nut, the main nut can achieve the anti-loosening effect, and the anti-loosening nut can also achieve anti-loosening at the same time. Furthermore, it can ensure that the main nut will not loosen for a long time, with stable and reliable operation, good anti-loosening effect, convenient use, and can be manufactured, having very good practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic structural view of an anti-loosening bolt and nut assembly of the present invention Figure 1 .

[0009] Figure 2 is a schematic structural view of an anti-loosening bolt and nut assembly of the present invention Figure 2 .

[0010] Figure 3 is a schematic structural view of a bolt of an anti-loosening bolt and nut assembly of the present invention.

[0011] Figure 4 is a schematic structural view of the main nut of an anti-loosening bolt and nut assembly of the present invention.

[0012] Figure 5 is a schematic structural view of the anti-loosening nut of an anti-loosening bolt and nut assembly of the present invention.

[0013] As shown in the figure:

[0014] 1. Bolt head, 2. Main screw, 3. Anti-loosening screw, 4. Main nut, 5. Anti-loosening nut, 6. Anti-loosening inclined teeth, 7. Through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0016] Embodiment 1, in combination with the attached Figures 1-5, A lock - preventing bolt - nut assembly, comprising a bolt and a main nut 4. The bolt includes a bolt head 1, a main screw rod 2 fixedly connected to the bolt head 1, and a lock - preventing screw rod 3 fixedly connected to the main screw rod 2. The thread directions of the main screw rod 2 and the lock - preventing screw rod 3 are opposite. The main nut 4 is threadedly connected to the main screw rod 2, and a lock - preventing nut 5 is threadedly connected to the lock - preventing screw rod 3. Anti - loosening inclined teeth 6 that cooperate with each other are provided at the lower end of the main nut 4 and the upper end of the lock - preventing nut 5. During use, the length of the main screw rod 2 is designed as required, and the bolt is passed through the connection holes of two workpieces to be connected. First, the main screw rod 2 is screwed onto the main screw rod 2 and tightened. At this time, the lower end of the main screw rod 2 does not extend out of the main nut 4. Then, the lock - preventing nut 5 is screwed onto the lock - preventing screw rod 3 and tightened so that the anti - loosening inclined teeth 6 on the lock - preventing nut 5 engage with the anti - loosening inclined teeth 6 on the main nut 4. At this time, when the main nut 4 has a tendency to loosen, it will drive the lock - preventing nut 5 to move through the anti - loosening inclined teeth 6 on it. Because the rotation directions of the main nut 4 and the lock - preventing nut 5 are opposite when they loosen, the lock - preventing nut 5 will prevent the main nut 4 from loosening, achieving the purpose of preventing loosening. At the same time, when the lock - preventing nut 5 has a tendency to loosen, the main nut 4 will also prevent the lock - preventing nut 5 from loosening, so that a good anti - loosening effect can be achieved.

[0017] The main screw rod 2 and the lock - preventing screw rod 3 are coaxial, which is convenient for use. At the same time, the bolt is evenly stressed and not easily broken.

[0018] The diameter of the main screw rod 2 is larger than that of the lock - preventing screw rod 3, so as to ensure that the main nut 4 can easily pass through the lock - preventing screw rod 3 and then be connected to the main screw rod 2. A threaded hole that matches the thread on the lock - preventing screw rod 3 is provided at the lower part of the lock - preventing nut 5, and a through - hole 7 that penetrates the threaded hole is provided at the upper part of the lock - preventing nut 5. The diameter of the through - hole 7 is larger than the outer diameter of the main screw rod 2. When screwing the lock - preventing nut 5, the part of the lock - preventing nut 5 with the through - hole 7 at the upper part can be sleeved on the main screw rod 2. Thus, even if the main screw rod 2 extends a small length from the main nut 4 when the main nut 4 is tightened, the anti - loosening inclined teeth 6 on the lock - preventing nut 5 can still engage with the anti - loosening inclined teeth 6 on the main nut 4 when the lock - preventing nut 5 is screwed, meeting the connection requirements of workpieces with different thicknesses and having stronger applicability.

[0019] The main screw rod 2 uses a right - hand thread, and the lock - preventing screw rod 3 uses a left - hand thread.

[0020] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, it is 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 should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0021] In addition, if terms such as "horizontal", "vertical", "hanging", etc. appear, it does not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0022] In the description of the embodiments of the present invention, "a plurality of" represents at least two.

[0023] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] The above describes the present invention and its implementation manners. Such a description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. An anti-loosening bolt and nut assembly, comprising a bolt and a main nut (4), characterized in that: The bolt includes a bolt head (1), a main screw rod (2) fixedly connected to the bolt head (1), and a lock - loosening screw rod (3) fixedly connected to the main screw rod (2). The thread directions of the main screw rod (2) and the lock - loosening screw rod (3) are opposite. The main nut (4) is thread - connected to the main screw rod (2), and a lock - loosening nut (5) is thread - connected to the lock - loosening screw rod (3). Anti - loosening inclined teeth (6) that cooperate with each other are provided at the lower end of the main nut (4) and the upper end of the lock - loosening nut (5).

2. The anti-loosening bolt and nut assembly according to claim 1, characterized in that: The main screw rod (2) and the lock - loosening screw rod (3) are co - axial.

3. The anti-loosening bolt and nut assembly according to any one of claims 2, characterized in that: The diameter of the main screw rod (2) is larger than the diameter of the lock - loosening screw rod (3). A threaded hole that matches the thread on the lock - loosening screw rod (3) is provided at the lower part of the lock - loosening nut (5), and a through - hole (7) that penetrates through the threaded hole is provided at the upper part of the lock - loosening nut (5). The diameter of the through - hole (7) is larger than the outer diameter of the main screw rod (2).

4. A lock - preventing bolt - nut assembly according to claims 1 - 3, characterized in that: The main screw rod (2) uses a right - hand thread, and the lock - loosening screw rod (3) uses a left - hand thread.

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