Anti-loosening bolt assembly

Abstract

An anti-loosening bolt assembly comprises a screw rod (1), a main nut (2), a wedge pin (3), a gasket (4) and an auxiliary nut (5). A wedge pin positioning key groove (6) is formed in the inner side of a thread of the main nut (2), the wedge pin (3) is in a wedge shape and located in the positioning key groove (6), and the top end plane of the wedge pin (3) makes contact with the gasket (4). And the auxiliary nut (5) is positioned on the gasket (4). One side face of the wedge pin (3) is provided with a scrap collecting cavity (7) with a semicircular opening, and the scrap collecting cavity (7) is used for collecting scraps generated after threads of the screw are damaged. A cutting edge (8) is arranged at an upper opening of the scrap collecting cavity (7) to form a planer tool, so that the aim of damaging threads of the screw rod is fulfilled; the bolt has the advantages of high vibration resistance, looseness prevention, simple structure, easiness in production, simplicity and convenience in use, detachability, reusability and the like, accident injury and economic loss caused by looseness in the use process of the bolt can be effectively prevented, and the bolt can be widely applied to various occasions needing fastening connection.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-loosening of mechanical fasteners, and more particularly to an anti-loosening bolt assembly. Background Art

[0002] Anti-loosening bolts and self-locking nuts are a common type of anti-loosening bolt assembly, including commonly used self-locking anti-loosening threaded fasteners. There are mainly various self-locking bolts or ring groove opening studs used for self-locking, adding various spring washers in threaded connections to achieve frictional anti-loosening of threaded machinery, and plastic filling and other anti-loosening methods. Ordinary bolts often become loose during use. Although there are anti-loosening nuts on the market currently, the anti-loosening effect is not lasting. For example, in the existing double-nut locking, the principle is that after the two nuts are tightened, the axial force generated between the nuts increases the frictional force between the nut threads and the bolt threads to prevent the nut from loosening. However, the force directions of this type of double nut during vibration are the same, and it will inevitably generate and receive loosening forces in the same direction, so loosening is inevitable. Relying solely on the pressure friction between the screw and the nut for anti-loosening has the above-mentioned drawbacks.

[0003] In order to overcome the above drawbacks, there was once a patent application No. 202120642841.8 for an anti-loosening nut, which adopted a thimble method to use a thimble that destroys the thread on the nut to lock the screw and the nut at the thread of the screw. However, this patent is restricted in terms of the use function of the bolt itself. There are two deficiencies in the functional design of this patent. The first deficiency is that it is very difficult to reuse the bolt, or even it is disposable. The thimble on the nut is a rod-shaped structure without a nail cap designed for withdrawal. Once it is inserted into the screw, it is almost impossible to pull it out again, resulting in the bolt being unable to be reused. The second deficiency is that when encountering a relatively thick screw, the diameter of this rod-shaped thimble must also increase accordingly. When such a thick thimble is inserted into the screw, a large amount of thread debris on the screw that is destroyed has nowhere to be discharged, the force-bearing pressure will increase sharply, the thimble cannot move forward, and it is very laborious to lock the nut by manpower, or even impossible to complete. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the purpose of the present invention is to provide an anti-loosening bolt assembly to solve the problems mentioned in the above background art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: An anti-loosening bolt assembly includes a screw rod (1), a main nut (2), a wedge pin (3), a washer (4), and a sub-nut (5); the inner side of the thread of the main nut (2) includes a wedge pin positioning keyway (6), and its shape is a concave wedge groove that is wider at the top and narrower at the bottom; the wedge pin (3) is wedge-shaped with a large head and a small tail, the small tail end includes a flat tip, the tip extends into the wedge pin positioning keyway (6) of the main nut (2), the side with a semi-circular opening is in contact with the thread of the screw rod (1), and the top is a rectangular plane and is in contact with the washer (4); the sub-nut (5) is located above the washer (4). A chip collecting cavity (7) with an open semi-circular shape for collecting chips is provided on one side of the wedge pin (3) to collect the chips generated after damaging the screw thread. The upper opening of the open semi-circle of the chip collecting cavity (7) is a sharp cutting edge (8) to achieve the purpose of damaging the screw thread. A wedge pin annular groove (9) is provided below the rectangular plane at the top of the wedge pin (3) to provide a grip for prying out the wedge pin (3) when disassembling the bolt. Description of the Drawings

[0006] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. The drawings in the following description are only some embodiments of the present invention, which are helpful for those of ordinary skill in the art to further understand the present invention.

[0007] Figure 1 This is a partial cross-sectional view of the overall structure of the relaxation state of the present invention.

[0008] Figure 2 This is a partial cross-sectional view of the overall structure of the locking state of the present invention.

[0009] Figure 3 This is a three-dimensional view of the structure of the main locking nut of the present invention.

[0010] In the drawings, the reference numerals for each are as follows: 1 - Screw rod; 2 - Main nut; 3 - Wedge pin; 4 - Washer; 5 - Sub-nut; 6 - Wedge pin positioning keyway; 7 - Chip collecting cavity; 8 - Cutting edge; 9 - Wedge pin annular groove. Detailed Embodiment

[0011] To more clearly illustrate the present invention, the following will further describe the present invention in detail in combination with the embodiments and with reference to the drawings.

[0012] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Embodiment

[0013] As Figures 1-3A kind of anti-loosening bolt assembly shown in the figure includes a screw rod (1), a main nut (2), a wedge pin (3), a washer (4), and a sub-nut (5). The inner side of the thread of the main nut (2) includes a wedge pin positioning keyway (6), and its shape is a concave wedge groove that is wider at the top and narrower at the bottom. The wedge pin (3) is in the shape of a wedge with a large head and a small tail. The small tail end includes a flat tip, and the tip extends into the wedge pin positioning keyway (6) of the main nut (2). The side with a semi-circular opening is in contact with the thread of the screw rod (1), and the top is a rectangular plane, which is in contact with the washer (4). The sub-nut (5) is located above the washer (4).

[0014] The present invention adopts the following technical solutions to achieve the improvement of the above design. A chip collecting cavity (7) with an opening semi-circle is arranged on one side of the wedge pin (3) to collect the chips generated after damaging the thread of the screw rod. The upper opening of the opening semi-circle of the chip collecting cavity (7) is a sharp cutting edge (8) to achieve the purpose of damaging the thread of the screw rod. A wedge pin annular groove (9) is arranged below the rectangular plane at the top of the wedge pin (3) to provide a grip for prying out the wedge pin (3) when disassembling the bolt.

[0015] The main inventive point and contribution of the present invention lie in: a wedge pin (3) with a chip collecting cavity (7), a cutting edge (8), and an annular groove (9) is arranged on the main nut (2); the chip collecting cavity (7) is arranged to collect the chips generated after damaging the thread of the screw rod; the sharp cutting edge (8) is arranged to easily achieve the purpose of damaging the thread of the screw rod; the wedge pin annular groove (9) is arranged to provide a grip for prying out the wedge pin (3) when disassembling the bolt.

[0016] The specific implementation method and working principle of the embodiment are as follows: As Figure 1 shown, for a kind of anti-loosening bolt assembly, when in use, first, the workpiece to be fixed is screwed and fixed with the screw rod (1) and the main nut (2). To prevent relative loosening between the nut and the screw rod, after the workpiece is fixed, a wedge pin is arranged in the present invention. See Figure 3 : At this time, the wedge pin (3) is inserted into the wedge pin positioning keyway (6) of the main nut (2). The side with a semi-circular opening is in contact with the thread of the screw rod (1), that is, the cutting edge (8) is in contact with the thread of the screw rod (1). Next, the washer (4) is placed on the wedge pin (3), and finally, the top sub-nut (5) is screwed tightly. During the process of gradually screwing tightly, the downward axial pressure is used to push the wedge pin (3) downward, and at the same time, it is radially squeezed by the inclined plane of the positioning keyway (6) to press the thread of the screw rod (1). The two forces act on the wedge pin (3) together. The sharp cutting edge (8) is like the cutter of a planer to cut out a groove on the thread of the screw rod (1) and move forward along with it. The cut chips are placed into the chip collecting cavity (7), and finally, the nut and the screw rod are wedged together and locked as the wedge pin (3) moves (see Figure 2). When the screw rod and nut of the bolt assembly are vibrated and subjected to radial rotational forces, the wedge pin (3) wedges together with the screw rod (1) to lock, generating an axial force that is perpendicular to and offsets the rotational radial force, thereby ensuring the completion of the anti-loosening task.

[0017] When the bolt assembly needs to be disassembled, first loosen the auxiliary nut (5) and remove the washer (4). Insert a flat-tip screwdriver into the annular groove (9) of the wedge pin to pry out the wedge pin (3), and finally easily loosen the main nut (2).

[0018] The setting of the chip collection cavity (7) of the present invention effectively solves the resistance generated by debris during the forward movement of the wedge pin.

[0019] The cutting edge (8) of the present invention is set with a high-hardness cutting tool alloy steel. With a sharp and hard cutting edge, the operation of cutting the threads on the screw rod will be more labor-saving.

[0020] The setting of the annular groove (9) of the wedge pin of the present invention is mainly to provide a grip for prying out the wedge pin (3) when the bolt assembly is disassembled and reused.

[0021] The wedge pin positioning keyway (6) on the main nut (2) of the present invention and the wedge pin (3) are set in corresponding equal numbers, and can be set at equal positions on the main nut (2) according to the diameter of the screw rod (1) as 2, 3, or 6, so that the acting forces of the washer (4) and the auxiliary nut (5) pressing on the wedge pin (3) are more evenly distributed.

[0022] The screw rod (1), main nut (2), and auxiliary nut (5) of the present invention have the same standard thread selection specifications, making them universal and more conducive to processing and production.

[0023] The present invention has the advantages of high anti-vibration, anti-loosening, simple structure, easy production, convenient use, detachable and reusable, etc. It can effectively prevent accident injuries and economic losses caused by loosening of bolts during use, and can be widely applied to various occasions requiring fastening connections.

Claims

1. An anti-loosening bolt assembly, characterized in that: It includes a screw rod (1), a main nut (2), a wedge pin (3), a washer (4), and a sub-nut (5); the inner side of the thread of the main nut (2) includes a wedge pin positioning keyway (6), and its shape is a concave wedge groove that is wider at the top and narrower at the bottom; the wedge pin (3) is wedge-shaped with a large head and a small tail, and the small tail end includes a flat tip that extends into the wedge pin positioning keyway (6) of the main nut (2), the side with a semi-circular opening is in contact with the thread of the screw rod (1), and the top is a rectangular plane that is in contact with the washer (4); the sub-nut (5) is located above the washer (4).

2. The anti-loosening bolt assembly according to claim 1, characterized in that: A chip collecting cavity (7) with an open semi-circular shape is provided on one side of the wedge pin (3) to collect chips generated after damaging the thread of the screw rod.

3. The anti-loosening bolt assembly according to claim 2, wherein: The upper opening of the open semi-circle of the chip collecting cavity (7) is a sharp cutting edge (8) to achieve the purpose of damaging the thread of the screw rod.

4. A loosening prevention bolt assembly according to claim 1, characterized in that: A wedge pin annular groove (9) is provided under the rectangular plane at the top of the wedge pin (3) to provide a grip for prying out the wedge pin (3) when disassembling the bolt.

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