Self-locking nut

Abstract

The utility model relates to a self-locking nut which comprises an upper nut, a lower nut and a torsional spring. Concave step threaded holes are formed in the butt joint end of the upper nut, the concave step threaded holes are divided into an inner threaded hole and an outer threaded hole, and the inner threaded hole and the outer threaded hole are coaxial and opposite in screwing direction; a convex ring table is formed at the butt joint end of the lower nut, a threaded hole is formed in the center of the convex ring table, an external thread is formed on the outer ring surface of the convex ring table, and the thread of the threaded hole and the internal threaded hole are the same in specification and can form a continuous complete thread; the external thread of the upper nut is in threaded connection with the external thread hole of the lower nut; the first annular groove and the second annular groove can form an annular cavity after being in butt joint, the torsional spring is arranged in the annular cavity, the head end and the tail end of the torsional spring act on the first boss and the second boss respectively, and elastic force is formed between the upper nut and the lower nut. According to the self-locking nut, self-locking can be achieved, the self-locking nut cannot loosen in the using process, and reliable locking can be provided through the spring.

Description

Technical Field

[0001] The utility model relates to the field of fasteners, in particular to a self-locking nut which can reliably self-lock. Background Art

[0002] Nuts are commonly used threaded fasteners, which are easy to use and have many application scenarios. However, threaded connections are prone to loosening when used in unstable environments for a long time, and eventually fall off, causing various accidents. Currently, the commonly used anti-loosening measures mainly include fuses, glue coating, and adding anti-loosening washers. The problems are inconvenient use, difficult disassembly, or low locking reliability. Utility Model Content

[0003] Purpose of the utility model: to provide a nut which is easy to use and can reliably self-lock.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] Provided is a nut which is easy to use and can reliably self-lock, comprising an upper nut 1, a lower nut 2 and a torsion spring 3;

[0006] A concave step threaded hole is formed at the butt end of the upper nut 1, and the concave step threaded hole is divided into an internal threaded hole 4 and an external threaded hole 6. The internal threaded hole 4 and the external threaded hole 6 are coaxial and have opposite rotation directions. A first annular groove 5 is also formed on the annular butt surface 7 at the butt end, and a radially extending first boss 8 is formed on the side wall of the first annular groove;

[0007] A convex ring platform is formed at the butt end of the lower nut 2, the center of the convex ring platform is a threaded hole 11, and the outer ring surface of the convex ring platform forms an external thread 12. The thread of the threaded hole 11 has the same specification as the internal threaded hole, and can form a continuous and complete thread; the external thread 12 forms a threaded fit with the external threaded hole 6; the step surface 13 of the convex ring platform forms a second annular groove 10, and a radially extending second convex platform 14 is formed on the side wall of the second annular groove;

[0008] The upper nut 1 and the lower nut 2 are rotatably connected to each other through the butt ends, and the external thread 12 of the upper nut is threadedly connected to the external thread hole 6 of the lower nut;

[0009] The first annular groove and the second annular groove can form an annular cavity after docking, and the torsion spring is arranged in the annular inner cavity, and the head end 16 and the tail end 17 of the torsion spring act on the first boss 8 and the second boss 14 respectively, forming an elastic force between the upper nut 1 and the lower nut 2.

[0010] Furthermore, the first end 16 of the torsion spring forms a hook.

[0011] Furthermore, the tail end 17 of the torsion spring forms a hook.

[0012] Furthermore, the outer side surface of the upper nut 1 is formed into an outer hexagonal structure 9 .

[0013] Furthermore, the outer side surface of the lower nut is formed into an outer hexagonal structure 9.

[0014] When in use, the upper nut 1 and the lower nut are screwed into a complete nut so that the internal thread forms a whole. In this case, the entire nut is screwed onto the bolt to be connected. At this time, under the elastic pre-tightening action of the torsion spring, the upper nut 1 and the lower nut are locked with the bolt, and can be locked in either forward or reverse direction.

[0015] Beneficial effects of the utility model

[0016] The self-locking nut of the utility model can realize self-locking and will not come loose during use, and can provide reliable locking through the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a structural sectional view of the utility model;

[0020] Figure 3 It is an assembly explosion diagram of the utility model;

[0021] Figure 4a It is a cross-sectional view of the upper nut of the utility model;

[0022] Figure 4b This is a schematic diagram of the upper nut structure of the utility model;

[0023] Figure 5a It is a cross-sectional view of the lower nut of the utility model;

[0024] Figure 5b This is a schematic diagram of the lower nut structure of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the torsion spring of the utility model;

[0026] Figure 7 A cross-sectional schematic diagram for use in the present utility model;

[0027] In the figure, an upper nut 1, a lower nut 2, a torsion spring 3, an internal threaded hole 4, a first annular groove 5, an external threaded hole 6, an annular butt surface 7, a first boss 8, an external hexagonal structure 9 of the upper nut, a second annular groove 10, a threaded hole 11, an external thread 12, a step surface 13, a second boss 14, an external hexagonal structure 15 of the lower nut, a head end 16, a tail end 17, a bolt 18, a nut of the utility model 19, a workpiece A, and a workpiece B. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] Provided is a nut which is easy to use and can reliably self-lock, and the structure of which comprises an upper nut 1, a lower nut 2 and a torsion spring 3;

[0030] A concave step threaded hole is formed at the butt end of the upper nut 1, and the concave step threaded hole is divided into an internal threaded hole 4 and an external threaded hole 6. The internal threaded hole 4 and the external threaded hole 6 are coaxial and have opposite rotation directions. A first annular groove 5 is also formed on the annular butt surface 7 at the butt end, and a radially extending first boss 8 is formed on the side wall of the first annular groove;

[0031] A convex ring platform is formed at the butt end of the lower nut 2, the center of the convex ring platform is a threaded hole 11, the outer ring surface of the convex ring platform forms an external thread 12, the thread of the threaded hole 11 has the same specification as the internal threaded hole, and can form a continuous and complete thread; the external thread 12 forms a threaded fit with the external threaded hole 6; the step surface of the convex ring platform forms a second annular groove, and a radially extending second convex platform 14 is formed on the side wall of the second annular groove;

[0032] The upper nut 1 and the lower nut 2 are rotatably connected to each other through the butt ends, and the external thread 12 of the upper nut is threadedly connected to the external thread hole 6 of the lower nut;

[0033] The first annular groove and the second annular groove can form an annular cavity after docking, and the torsion spring is arranged in the annular inner cavity, and the head end 16 and the tail end 17 of the torsion spring act on the first boss 8 and the second boss 14 respectively, forming an elastic force between the upper nut 1 and the lower nut 2.

[0034] The first end 16 of the torsion spring forms a hook.

[0035] The tail end 17 of the torsion spring forms a hook.

[0036] The outer side surface of the upper nut 1 is formed into an outer hexagonal structure 9 .

[0037] The outer side surface of the lower nut is formed into an outer hexagonal structure 9 .

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in this specification may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments described in this specification, but will conform to the broadest scope consistent with the principles and novel features disclosed in this specification.

Claims

1. A self-locking nut, characterized in that: It includes an upper nut, a lower nut and a torsion spring; A concave step threaded hole is formed at the butt end of the upper nut, and the concave step threaded hole is divided into an internal threaded hole and an external threaded hole, the internal threaded hole and the external threaded hole are coaxial and have opposite rotation directions, and a first annular groove is also formed on the annular butt surface of the butt end, and a first radially extending boss is formed on the side wall of the first annular groove; A convex ring platform is formed at the butt end of the lower nut, the center of the convex ring platform is a threaded hole, the outer ring surface of the convex ring platform forms an external thread, the thread of the threaded hole has the same specification as the internal threaded hole, and can form a continuous and complete thread; the external thread and the external threaded hole form a threaded fit; the step surface of the convex ring platform forms a second annular groove, and a radially extending second convex platform is formed on the side wall of the second annular groove; The upper nut and the lower nut are rotatably connected to each other through the butt ends, and the external thread of the upper nut is threadedly connected to the external thread hole of the lower nut; The first annular groove and the second annular groove can form an annular cavity after docking, and the torsion spring is arranged in the annular inner cavity, and the head end and the tail end of the torsion spring act on the first boss and the second boss respectively, forming an elastic force between the upper nut and the lower nut.

2. The self-locking nut according to claim 1, characterized in that: The first end of the torsion spring forms a hook.

3. The self-locking nut according to claim 1, characterized in that: The tail end of the torsion spring forms a hook.

4. The self-locking nut according to claim 1, characterized in that: The outer side surface of the upper nut is formed into an outer hexagonal structure.

5. The self-locking nut according to claim 1, characterized in that: The outer side surface of the lower nut is formed into an outer hexagonal structure.

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