Self-locking nut

Abstract

The utility model discloses a self-locking nut which comprises a first nut, a second nut, a locking petal and a locking groove, the first nut and the second nut are both provided with threaded holes, the first nut is located below the second nut, the two threaded holes are located on the same vertical axis, a locking ring is fixed at the top end of the first nut, and the locking petal is located in the locking groove. The locking ring and the threaded hole are located on the same vertical axis, an internal thread of the threaded hole in the first nut extends to the top end of the inner wall of the locking ring, the upper portion of the locking ring is a guiding frustum in a cone frustum shape, the outer diameter of the guiding frustum is gradually increased from top to bottom, and the outer diameter of the top end of the guiding frustum is larger than the large diameter of the threaded hole. A plurality of vertically arranged separation grooves are formed in the side wall of the locking ring; according to the locking nut, the locking petals are matched with the locking grooves, so that the friction force between the first nut and the screw rod is increased when the first nut has the loosening tendency, the first nut is not prone to loosening, and the anti-loosening effect of the nut is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to the technical field of nuts. Background Art

[0002] Self-locking nuts are nut that can lock themselves by friction. Ordinary nuts will loosen by themselves due to vibration and other reasons during use. In order to prevent this phenomenon, self-locking nuts were invented. The main functions of self-locking nuts are anti-loosening and anti-vibration. They are used in special occasions. Their working principle is generally self-locking by friction. Self-locking nuts are classified by function into types with embedded nylon rings, necked ends, and metal anti-loosening devices. The existing self-locking nuts have less than ideal anti-loosening effect. Summary of the Invention

[0003] The purpose of the utility model is to solve the problems in the prior art and to provide a self-locking nut, which can make the nut have good anti-loosening performance.

[0004] To achieve the above-mentioned purpose, the present invention proposes a self-locking nut, comprising a first nut, a second nut, a locking petal, and a locking groove. The first nut and the second nut are both provided with a threaded hole, the first nut is located below the second nut, the two threaded holes are located on the same vertical axis, a locking ring is fixed to the top of the first nut, the locking ring and the threaded hole are located on the same vertical axis, the internal thread of the threaded hole in the first nut extends to the top of the inner wall of the locking ring, the upper part of the locking ring is a guide cone in the shape of a truncated cone, and the outer diameter of the guide cone is from top to bottom. Gradually increases, the outer diameter of the top of the guide frustum is larger than the major diameter of the threaded hole, and a plurality of vertically arranged dividing grooves are provided on the side wall of the locking ring, which divide the locking ring into a plurality of locking petals. A locking groove is provided at the bottom of the second nut, and the locking groove is a tapered hole adapted to the guide frustum. The inner diameter of the locking groove gradually increases from top to bottom. The locking groove and the threaded hole are located on the same vertical axis. The inner diameter of the top of the locking groove is equal to the major diameter of the threaded hole. The guide frustum extends into the locking groove, and the conical surface of the guide frustum fits the inner wall of the locking groove.

[0005] Preferably, the inner diameter of the bottom end of the locking groove is smaller than the outer diameter of the bottom end of the guide cone.

[0006] Preferably, a plurality of bosses are provided on the outer wall of the first nut and the outer wall of the second nut, and auxiliary holes are provided on the bosses. The bosses on the first nut correspond to the bosses on the second nut one by one, and the two corresponding bosses are equipped with a spring. Hooks are provided at both ends of the spring, and the two hooks hook the two bosses respectively. The hooks pass through the auxiliary holes, and the spring is in a stretched state.

[0007] Preferably, the first nut and the second nut are both hexagonal nuts, and a boss is provided at the lower portion of each outer side wall of the first nut and the second nut.

[0008] The beneficial effects of the utility model: the utility model matches the locking petal and the locking groove so that when the first nut has a tendency to loosen, the friction between it and the screw also tends to increase, making the first nut not easy to loosen, thereby ensuring the anti-loosening effect of the nut; the setting of the spring makes the second nut have a downward tendency, preventing the second nut from loosening.

[0009] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the front view of the self-locking nut of the utility model;

[0011] Figure 2 This is a top view of the first nut of the self-locking nut of the utility model.

[0012] In the figure: 1-first nut, 2-second nut, 3-locking ring, 4-spring, 10-threaded hole, 15-boss, 16-auxiliary hole, 21-locking groove, 30-separation groove, 31-guide cone, 35-locking petal, 40-hook. DETAILED DESCRIPTION

[0013] Example 1:

[0014] See Figure 1 、 Figure 2 The self-locking nut of the present invention comprises a first nut 1, a second nut 2, a locking petal 35, and a locking groove 21. The first nut 1 and the second nut 2 are both provided with a threaded hole 10. The first nut 1 is located below the second nut 2. The two threaded holes 10 are located on the same vertical axis. A locking ring 3 is fixed to the top of the first nut 1. The locking ring 3 and the threaded hole 10 are located on the same vertical axis. The internal thread of the threaded hole 10 in the first nut 1 extends to the top of the inner wall of the locking ring 3. The upper part of the locking ring 3 is a guide cone 31 in the shape of a truncated cone. The outer diameter of the guide cone 31 gradually increases from top to bottom. The guide cone 3 1 has an outer diameter at its top that is larger than the major diameter of the threaded hole 10. The side wall of the locking ring 3 is provided with a plurality of vertically arranged dividing grooves 30, which divide the locking ring 3 into a plurality of locking petals 35. The bottom of the second nut 2 is provided with a locking groove 21, which is a tapered hole adapted to the guide cone 31. The inner diameter of the locking groove 21 gradually increases from top to bottom. The locking groove 21 and the threaded hole 10 are located on the same vertical axis. The inner diameter of the top of the locking groove 21 is equal to the major diameter of the threaded hole 10. The guide cone 31 extends into the locking groove 21, and the conical surface of the guide cone 31 fits in contact with the inner wall of the locking groove 21.

[0015] The inner diameter of the bottom end of the locking groove 21 is smaller than the outer diameter of the bottom end of the guide cone 31 .

[0016] Example 2:

[0017] On the basis of Example 1, a plurality of bosses 15 are provided on the outer wall of the first nut 1 and the outer wall of the second nut 2, and auxiliary holes 16 are provided on the bosses 15. The bosses 15 on the first nut 1 and the bosses 15 on the second nut 2 correspond to each other one by one, and the two corresponding bosses 15 are equipped with a spring 4. Hooks 40 are provided at both ends of the spring 4. The two hooks 40 hook the two bosses 15 respectively, and the hooks 40 pass through the auxiliary holes 16, and the spring 4 is in a stretched state.

[0018] The spring 4 is arranged tilted, and the tilting direction of the spring 4 satisfies the requirement of applying force to the first nut 1 to rotate the first nut 1 in a loosening direction, and applying force to the second nut 2 to rotate the second nut 2 in a tightening direction.

[0019] The first nut 1 and the second nut 2 are both hexagonal nuts, and a boss 15 is provided at the lower portion of each outer side wall of the first nut 1 and the second nut 2 .

[0020] Working process of this utility model:

[0021] During the operation of the self-locking nut of the present invention, the first nut 1 is tightened first, and then the second nut 2 is tightened. Then, a spring 4 is hung between the first nut 1 and the second nut 2. The spring 4 is arranged to be inclined. The inclined direction of the spring 4 satisfies the requirement of applying a force to the first nut 1 to rotate the first nut 1 in a loosening direction and applying a force to the second nut 2 to rotate the second nut 2 in a tightening direction.

[0022] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the scope of protection of the present invention.

Claims

1. Self-locking nut, characterized by: The invention comprises a first nut (1), a second nut (2), a locking flap (35), and a locking groove (21), wherein the first nut (1) and the second nut (2) are both provided with a threaded hole (10), the first nut (1) is located below the second nut (2), the two threaded holes (10) are located on the same vertical axis, a locking ring (3) is fixed to the top of the first nut (1), the locking ring (3) and the threaded hole (10) are located on the same vertical axis, the internal thread of the threaded hole (10) in the first nut (1) extends to the top of the inner wall of the locking ring (3), the upper part of the locking ring (3) is a guide cone (31) in the shape of a truncated cone, the outer diameter of the guide cone (31) gradually increases from top to bottom, and the top of the guide cone (31) is provided with a guide cone (31). The outer diameter of the locking ring (3) is larger than the major diameter of the threaded hole (10), and a plurality of vertically arranged separation grooves (30) are provided on the side wall of the locking ring (3), and the separation grooves (30) separate the locking ring (3) into a plurality of locking petals (35). A locking groove (21) is provided at the bottom of the second nut (2), and the locking groove (21) is a tapered hole adapted to the guide cone (31). The inner diameter of the locking groove (21) gradually increases from top to bottom. The locking groove (21) and the threaded hole (10) are located on the same vertical axis. The inner diameter of the top of the locking groove (21) is equal to the major diameter of the threaded hole (10). The guide cone (31) extends into the locking groove (21), and the conical surface of the guide cone (31) fits the inner wall of the locking groove (21).

2. The self-locking nut according to claim 1, wherein: The inner diameter of the bottom end of the locking groove (21) is smaller than the outer diameter of the bottom end of the guide cone (31).

3. The self-locking nut according to claim 1, wherein: A plurality of bosses (15) are provided on the outer wall of the first nut (1) and the outer wall of the second nut (2), and auxiliary holes (16) are provided on the bosses (15). The bosses (15) on the first nut (1) and the bosses (15) on the second nut (2) correspond to each other one by one. The two corresponding bosses (15) are equipped with a spring (4). Both ends of the spring (4) are provided with hooks (40). The two hooks (40) respectively hook the two bosses (15). The hooks (40) pass through the auxiliary holes (16), and the spring (4) is in a stretched state.

4. The self-locking nut according to claim 3, wherein: The first nut (1) and the second nut (2) are both hexagonal nuts, and a boss (15) is provided at the lower portion of each outer side wall of the first nut (1) and the second nut (2).

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